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shared/varlink: add missing va_end()
[thirdparty/systemd.git] / src / shared / varlink.c
CommitLineData
d41bd96f
LP		 1/* SPDX-License-Identifier: LGPL-2.1+ */
2
3#include <sys/poll.h>
4
5#include "alloc-util.h"
6#include "errno-util.h"
7#include "fd-util.h"
8#include "hashmap.h"
9#include "list.h"
10#include "process-util.h"
11#include "set.h"
12#include "socket-util.h"
13#include "string-table.h"
14#include "string-util.h"
15#include "strv.h"
16#include "time-util.h"
17#include "umask-util.h"
18#include "user-util.h"
19#include "varlink.h"
20
21#define VARLINK_DEFAULT_CONNECTIONS_MAX 4096U
22#define VARLINK_DEFAULT_CONNECTIONS_PER_UID_MAX 1024U
23
24#define VARLINK_DEFAULT_TIMEOUT_USEC (45U*USEC_PER_SEC)
25#define VARLINK_BUFFER_MAX (16U*1024U*1024U)
26#define VARLINK_READ_SIZE (64U*1024U)
27
28typedef enum VarlinkState {
29 /* Client side states */
30 VARLINK_IDLE_CLIENT,
31 VARLINK_AWAITING_REPLY,
32 VARLINK_CALLING,
33 VARLINK_CALLED,
34 VARLINK_PROCESSING_REPLY,
35
36 /* Server side states */
37 VARLINK_IDLE_SERVER,
38 VARLINK_PROCESSING_METHOD,
39 VARLINK_PROCESSING_METHOD_MORE,
40 VARLINK_PROCESSING_METHOD_ONEWAY,
41 VARLINK_PROCESSED_METHOD,
42 VARLINK_PROCESSED_METHOD_MORE,
43 VARLINK_PENDING_METHOD,
44 VARLINK_PENDING_METHOD_MORE,
45
46 /* Common states (only during shutdown) */
47 VARLINK_PENDING_DISCONNECT,
48 VARLINK_PENDING_TIMEOUT,
49 VARLINK_PROCESSING_DISCONNECT,
50 VARLINK_PROCESSING_TIMEOUT,
51 VARLINK_PROCESSING_FAILURE,
52 VARLINK_DISCONNECTED,
53
54 _VARLINK_STATE_MAX,
55 _VARLINK_STATE_INVALID = -1
56} VarlinkState;
57
58/* Tests whether we are not yet disconnected. Note that this is true during all states where the connection
59 * is still good for something, and false only when it's dead for good. This means: when we are
60 * asynchronously connecting to a peer and the connect() is still pending, then this will return 'true', as
61 * the connection is still good, and we are likely to be able to properly operate on it soon. */
62#define VARLINK_STATE_IS_ALIVE(state) \
63 IN_SET(state, \
64 VARLINK_IDLE_CLIENT, \
65 VARLINK_AWAITING_REPLY, \
66 VARLINK_CALLING, \
67 VARLINK_CALLED, \
68 VARLINK_PROCESSING_REPLY, \
69 VARLINK_IDLE_SERVER, \
70 VARLINK_PROCESSING_METHOD, \
71 VARLINK_PROCESSING_METHOD_MORE, \
72 VARLINK_PROCESSING_METHOD_ONEWAY, \
73 VARLINK_PROCESSED_METHOD, \
74 VARLINK_PROCESSED_METHOD_MORE, \
75 VARLINK_PENDING_METHOD, \
76 VARLINK_PENDING_METHOD_MORE)
77
78struct Varlink {
79 unsigned n_ref;
80
81 VarlinkServer *server;
82
83 VarlinkState state;
84 bool connecting; /* This boolean indicates whether the socket fd we are operating on is currently
85 * processing an asynchronous connect(). In that state we watch the socket for
86 * EPOLLOUT, but we refrain from calling read() or write() on the socket as that
87 * will trigger ENOTCONN. Note that this boolean is kept separate from the
88 * VarlinkState above on purpose: while the connect() is still not complete we
89 * already want to allow queuing of messages and similar. Thus it's nice to keep
90 * these two state concepts separate: the VarlinkState encodes what our own view of
91 * the connection is, i.e. whether we think it's a server, a client, and has
92 * something queued already, while 'connecting' tells us a detail about the
93 * transport used below, that should have no effect on how we otherwise accept and
94 * process operations from the user.
95 *
96 * Or to say this differently: VARLINK_STATE_IS_ALIVE(state) tells you whether the
97 * connection is good to use, even if it might not be fully connected
98 * yet. connecting=true then informs you that actually we are still connecting, and
99 * the connection is actually not established yet and thus any requests you enqueue
100 * now will still work fine but will be queued only, not sent yet, but that
101 * shouldn't stop you from using the connection, since eventually whatever you queue
102 * *will* be sent.
103 *
104 * Or to say this even differently: 'state' is a high-level ("application layer"
105 * high, if you so will) state, while 'conecting' is a low-level ("transport layer"
106 * low, if you so will) state, and while they are not entirely unrelated and
107 * sometimes propagate effects to each other they are only asynchronously connected
108 * at most. */
109 unsigned n_pending;
110
111 int fd;
112
113 char *input_buffer; /* valid data starts at input_buffer_index, ends at input_buffer_index+input_buffer_size */
114 size_t input_buffer_allocated;
115 size_t input_buffer_index;
116 size_t input_buffer_size;
117 size_t input_buffer_unscanned;
118
119 char *output_buffer; /* valid data starts at output_buffer_index, ends at output_buffer_index+output_buffer_size */
120 size_t output_buffer_allocated;
121 size_t output_buffer_index;
122 size_t output_buffer_size;
123
124 VarlinkReply reply_callback;
125
126 JsonVariant *current;
127 JsonVariant *reply;
128
129 struct ucred ucred;
130 bool ucred_acquired:1;
131
132 bool write_disconnected:1;
133 bool read_disconnected:1;
134 bool prefer_read_write:1;
135 bool got_pollhup:1;
136
137 usec_t timestamp;
138 usec_t timeout;
139
140 void *userdata;
141 char *description;
142
143 sd_event *event;
144 sd_event_source *io_event_source;
145 sd_event_source *time_event_source;
146 sd_event_source *quit_event_source;
147 sd_event_source *defer_event_source;
148};
149
150typedef struct VarlinkServerSocket VarlinkServerSocket;
151
152struct VarlinkServerSocket {
153 VarlinkServer *server;
154
155 int fd;
156 char *address;
157
158 sd_event_source *event_source;
159
160 LIST_FIELDS(VarlinkServerSocket, sockets);
161};
162
163struct VarlinkServer {
164 unsigned n_ref;
165 VarlinkServerFlags flags;
166
167 LIST_HEAD(VarlinkServerSocket, sockets);
168
169 Hashmap *methods;
170 VarlinkConnect connect_callback;
171
172 sd_event *event;
173 int64_t event_priority;
174
175 unsigned n_connections;
176 Hashmap *by_uid;
177
178 void *userdata;
179 char *description;
180
181 unsigned connections_max;
182 unsigned connections_per_uid_max;
183};
184
185static const char* const varlink_state_table[_VARLINK_STATE_MAX] = {
186 [VARLINK_IDLE_CLIENT] = "idle-client",
187 [VARLINK_AWAITING_REPLY] = "awaiting-reply",
188 [VARLINK_CALLING] = "calling",
189 [VARLINK_CALLED] = "called",
190 [VARLINK_PROCESSING_REPLY] = "processing-reply",
191 [VARLINK_IDLE_SERVER] = "idle-server",
192 [VARLINK_PROCESSING_METHOD] = "processing-method",
193 [VARLINK_PROCESSING_METHOD_MORE] = "processing-method-more",
194 [VARLINK_PROCESSING_METHOD_ONEWAY] = "processing-method-oneway",
195 [VARLINK_PROCESSED_METHOD] = "processed-method",
196 [VARLINK_PROCESSED_METHOD_MORE] = "processed-method-more",
197 [VARLINK_PENDING_METHOD] = "pending-method",
198 [VARLINK_PENDING_METHOD_MORE] = "pending-method-more",
199 [VARLINK_PENDING_DISCONNECT] = "pending-disconnect",
200 [VARLINK_PENDING_TIMEOUT] = "pending-timeout",
201 [VARLINK_PROCESSING_DISCONNECT] = "processing-disconnect",
202 [VARLINK_PROCESSING_TIMEOUT] = "processing-timeout",
203 [VARLINK_PROCESSING_FAILURE] = "processing-failure",
204 [VARLINK_DISCONNECTED] = "disconnected",
205};
206
207DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(varlink_state, VarlinkState);
208
209#define varlink_log_errno(v, error, fmt, ...) \
210 log_debug_errno(error, "%s: " fmt, varlink_description(v), ##__VA_ARGS__)
211
212#define varlink_log(v, fmt, ...) \
213 log_debug("%s: " fmt, varlink_description(v), ##__VA_ARGS__)
214
215#define varlink_server_log_errno(s, error, fmt, ...) \
216 log_debug_errno(error, "%s: " fmt, varlink_server_description(s), ##__VA_ARGS__)
217
218#define varlink_server_log(s, fmt, ...) \
219 log_debug("%s: " fmt, varlink_server_description(s), ##__VA_ARGS__)
220
221static inline const char *varlink_description(Varlink *v) {
222 return strna(v ? v->description : NULL);
223}
224
225static inline const char *varlink_server_description(VarlinkServer *s) {
226 return strna(s ? s->description : NULL);
227}
228
229static void varlink_set_state(Varlink *v, VarlinkState state) {
230 assert(v);
77740b59
ZJS		 231 assert(state >= 0 && state < _VARLINK_STATE_MAX);
232
233 if (v->state < 0)
234 varlink_log(v, "varlink: setting state %s",
235 varlink_state_to_string(state));
236 else
237 varlink_log(v, "varlink: changing state %s → %s",
238 varlink_state_to_string(v->state),
239 varlink_state_to_string(state));
d41bd96f
LP		 240
241 v->state = state;
242}
243
244static int varlink_new(Varlink **ret) {
245 Varlink *v;
246
247 assert(ret);
248
a48481dc 249 v = new(Varlink, 1);
d41bd96f
LP		 250 if (!v)
251 return -ENOMEM;
252
253 *v = (Varlink) {
254 .n_ref = 1,
255 .fd = -1,
256
257 .state = _VARLINK_STATE_INVALID,
258
259 .ucred.uid = UID_INVALID,
260 .ucred.gid = GID_INVALID,
261
262 .timestamp = USEC_INFINITY,
263 .timeout = VARLINK_DEFAULT_TIMEOUT_USEC
264 };
265
266 *ret = v;
267 return 0;
268}
269
270int varlink_connect_address(Varlink **ret, const char *address) {
271 _cleanup_(varlink_unrefp) Varlink *v = NULL;
272 union sockaddr_union sockaddr;
273 int r;
274
275 assert_return(ret, -EINVAL);
276 assert_return(address, -EINVAL);
277
278 r = sockaddr_un_set_path(&sockaddr.un, address);
279 if (r < 0)
280 return r;
281
282 r = varlink_new(&v);
283 if (r < 0)
284 return r;
285
286 v->fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
287 if (v->fd < 0)
288 return -errno;
289
290 if (connect(v->fd, &sockaddr.sa, SOCKADDR_UN_LEN(sockaddr.un)) < 0) {
291 if (!IN_SET(errno, EAGAIN, EINPROGRESS))
292 return -errno;
293
294 v->connecting = true; /* We are asynchronously connecting, i.e. the connect() is being
295 * processed in the background. As long as that's the case the socket
296 * is in a special state: it's there, we can poll it for EPOLLOUT, but
297 * if we attempt to write() to it before we see EPOLLOUT we'll get
298 * ENOTCONN (and not EAGAIN, like we would for a normal connected
299 * socket that isn't writable at the moment). Since ENOTCONN on write()
300 * hence can mean two different things (i.e. connection not complete
301 * yet vs. already disconnected again), we store as a boolean whether
302 * we are still in connect(). */
303 }
304
305 varlink_set_state(v, VARLINK_IDLE_CLIENT);
306
307 *ret = TAKE_PTR(v);
308 return r;
309}
310
311int varlink_connect_fd(Varlink **ret, int fd) {
312 Varlink *v;
313 int r;
314
315 assert_return(ret, -EINVAL);
316 assert_return(fd >= 0, -EBADF);
317
318 r = fd_nonblock(fd, true);
319 if (r < 0)
320 return r;
321
322 r = varlink_new(&v);
323 if (r < 0)
324 return r;
325
326 v->fd = fd;
327 varlink_set_state(v, VARLINK_IDLE_CLIENT);
328
329 /* Note that if this function is called we assume the passed socket (if it is one) is already
330 * properly connected, i.e. any asynchronous connect() done on it already completed. Because of that
331 * we'll not set the 'connecting' boolean here, i.e. we don't need to avoid write()ing to the socket
332 * until the connection is fully set up. Behaviour here is hence a bit different from
333 * varlink_connect_address() above, as there we do handle asynchronous connections ourselves and
334 * avoid doing write() on it before we saw EPOLLOUT for the first time. */
335
336 *ret = v;
337 return 0;
338}
339
340static void varlink_detach_event_sources(Varlink *v) {
341 assert(v);
342
1d3fe304 343 v->io_event_source = sd_event_source_disable_unref(v->io_event_source);
d41bd96f 344
1d3fe304 345 v->time_event_source = sd_event_source_disable_unref(v->time_event_source);
d41bd96f 346
1d3fe304 347 v->quit_event_source = sd_event_source_disable_unref(v->quit_event_source);
d41bd96f 348
1d3fe304 349 v->defer_event_source = sd_event_source_disable_unref(v->defer_event_source);
d41bd96f
LP		 350}
351
352static void varlink_clear(Varlink *v) {
353 assert(v);
354
355 varlink_detach_event_sources(v);
356
357 v->fd = safe_close(v->fd);
358
359 v->input_buffer = mfree(v->input_buffer);
360 v->output_buffer = mfree(v->output_buffer);
361
362 v->current = json_variant_unref(v->current);
363 v->reply = json_variant_unref(v->reply);
364
365 v->event = sd_event_unref(v->event);
366}
367
368static Varlink* varlink_destroy(Varlink *v) {
369 if (!v)
370 return NULL;
371
372 /* If this is called the server object must already been unreffed here. Why that? because when we
373 * linked up the varlink connection with the server object we took one ref in each direction */
374 assert(!v->server);
375
376 varlink_clear(v);
377
378 free(v->description);
379 return mfree(v);
380}
381
382DEFINE_TRIVIAL_REF_UNREF_FUNC(Varlink, varlink, varlink_destroy);
383
384static int varlink_test_disconnect(Varlink *v) {
385 assert(v);
386
387 /* Tests whether we the the connection has been terminated. We are careful to not stop processing it
388 * prematurely, since we want to handle half-open connections as well as possible and want to flush
389 * out and read data before we close down if we can. */
390
391 /* Already disconnected? */
392 if (!VARLINK_STATE_IS_ALIVE(v->state))
393 return 0;
394
395 /* Wait until connection setup is complete, i.e. until asynchronous connect() completes */
396 if (v->connecting)
397 return 0;
398
399 /* Still something to write and we can write? Stay around */
400 if (v->output_buffer_size > 0 && !v->write_disconnected)
401 return 0;
402
403 /* Both sides gone already? Then there's no need to stick around */
404 if (v->read_disconnected && v->write_disconnected)
405 goto disconnect;
406
407 /* If we are waiting for incoming data but the read side is shut down, disconnect. */
408 if (IN_SET(v->state, VARLINK_AWAITING_REPLY, VARLINK_CALLING, VARLINK_IDLE_SERVER) && v->read_disconnected)
409 goto disconnect;
410
411 /* Similar, if are a client that hasn't written anything yet but the write side is dead, also
412 * disconnect. We also explicitly check for POLLHUP here since we likely won't notice the write side
413 * being down if we never wrote anything. */
414 if (IN_SET(v->state, VARLINK_IDLE_CLIENT) && (v->write_disconnected || v->got_pollhup))
415 goto disconnect;
416
417 return 0;
418
419disconnect:
420 varlink_set_state(v, VARLINK_PENDING_DISCONNECT);
421 return 1;
422}
423
424static int varlink_write(Varlink *v) {
425 ssize_t n;
426
427 assert(v);
428
429 if (!VARLINK_STATE_IS_ALIVE(v->state))
430 return 0;
431 if (v->connecting) /* Writing while we are still wait for a non-blocking connect() to complete will
432 * result in ENOTCONN, hence exit early here */
433 return 0;
434 if (v->output_buffer_size == 0)
435 return 0;
436 if (v->write_disconnected)
437 return 0;
438
439 assert(v->fd >= 0);
440
441 /* We generally prefer recv()/send() (mostly because of MSG_NOSIGNAL) but also want to be compatible
442 * with non-socket IO, hence fall back automatically */
443 if (!v->prefer_read_write) {
444 n = send(v->fd, v->output_buffer + v->output_buffer_index, v->output_buffer_size, MSG_DONTWAIT|MSG_NOSIGNAL);
445 if (n < 0 && errno == ENOTSOCK)
446 v->prefer_read_write = true;
447 }
448 if (v->prefer_read_write)
449 n = write(v->fd, v->output_buffer + v->output_buffer_index, v->output_buffer_size);
450 if (n < 0) {
451 if (errno == EAGAIN)
452 return 0;
453
454 if (ERRNO_IS_DISCONNECT(errno)) {
455 /* If we get informed about a disconnect on write, then let's remember that, but not
456 * act on it just yet. Let's wait for read() to report the issue first. */
457 v->write_disconnected = true;
458 return 1;
459 }
460
461 return -errno;
462 }
463
464 v->output_buffer_size -= n;
465
466 if (v->output_buffer_size == 0)
467 v->output_buffer_index = 0;
468 else
469 v->output_buffer_index += n;
470
471 v->timestamp = now(CLOCK_MONOTONIC);
472 return 1;
473}
474
475static int varlink_read(Varlink *v) {
476 size_t rs;
477 ssize_t n;
478
479 assert(v);
480
481 if (!IN_SET(v->state, VARLINK_AWAITING_REPLY, VARLINK_CALLING, VARLINK_IDLE_SERVER))
482 return 0;
483 if (v->connecting) /* read() on a socket while we are in connect() will fail with EINVAL, hence exit early here */
484 return 0;
485 if (v->current)
486 return 0;
487 if (v->input_buffer_unscanned > 0)
488 return 0;
489 if (v->read_disconnected)
490 return 0;
491
492 if (v->input_buffer_size >= VARLINK_BUFFER_MAX)
493 return -ENOBUFS;
494
495 assert(v->fd >= 0);
496
497 if (v->input_buffer_allocated <= v->input_buffer_index + v->input_buffer_size) {
498 size_t add;
499
500 add = MIN(VARLINK_BUFFER_MAX - v->input_buffer_size, VARLINK_READ_SIZE);
501
502 if (v->input_buffer_index == 0) {
503
504 if (!GREEDY_REALLOC(v->input_buffer, v->input_buffer_allocated, v->input_buffer_size + add))
505 return -ENOMEM;
506
507 } else {
508 char *b;
509
510 b = new(char, v->input_buffer_size + add);
511 if (!b)
512 return -ENOMEM;
513
514 memcpy(b, v->input_buffer + v->input_buffer_index, v->input_buffer_size);
515
516 free_and_replace(v->input_buffer, b);
517
518 v->input_buffer_allocated = v->input_buffer_size + add;
519 v->input_buffer_index = 0;
520 }
521 }
522
523 rs = v->input_buffer_allocated - (v->input_buffer_index + v->input_buffer_size);
524
525 if (!v->prefer_read_write) {
526 n = recv(v->fd, v->input_buffer + v->input_buffer_index + v->input_buffer_size, rs, MSG_DONTWAIT);
527 if (n < 0 && errno == ENOTSOCK)
528 v->prefer_read_write = true;
529 }
530 if (v->prefer_read_write)
531 n = read(v->fd, v->input_buffer + v->input_buffer_index + v->input_buffer_size, rs);
532 if (n < 0) {
533 if (errno == EAGAIN)
534 return 0;
535
536 if (ERRNO_IS_DISCONNECT(errno)) {
537 v->read_disconnected = true;
538 return 1;
539 }
540
541 return -errno;
542 }
543 if (n == 0) { /* EOF */
544 v->read_disconnected = true;
545 return 1;
546 }
547
548 v->input_buffer_size += n;
549 v->input_buffer_unscanned += n;
550
551 return 1;
552}
553
554static int varlink_parse_message(Varlink *v) {
555 const char *e, *begin;
556 size_t sz;
557 int r;
558
559 assert(v);
560
561 if (v->current)
562 return 0;
563 if (v->input_buffer_unscanned <= 0)
564 return 0;
565
566 assert(v->input_buffer_unscanned <= v->input_buffer_size);
567 assert(v->input_buffer_index + v->input_buffer_size <= v->input_buffer_allocated);
568
569 begin = v->input_buffer + v->input_buffer_index;
570
571 e = memchr(begin + v->input_buffer_size - v->input_buffer_unscanned, 0, v->input_buffer_unscanned);
572 if (!e) {
573 v->input_buffer_unscanned = 0;
574 return 0;
575 }
576
577 sz = e - begin + 1;
578
579 varlink_log(v, "New incoming message: %s", begin);
580
581 r = json_parse(begin, &v->current, NULL, NULL);
582 if (r < 0)
583 return r;
584
585 v->input_buffer_size -= sz;
586
587 if (v->input_buffer_size == 0)
588 v->input_buffer_index = 0;
589 else
590 v->input_buffer_index += sz;
591
592 v->input_buffer_unscanned = v->input_buffer_size;
593 return 1;
594}
595
596static int varlink_test_timeout(Varlink *v) {
597 assert(v);
598
599 if (!IN_SET(v->state, VARLINK_AWAITING_REPLY, VARLINK_CALLING))
600 return 0;
601 if (v->timeout == USEC_INFINITY)
602 return 0;
603
604 if (now(CLOCK_MONOTONIC) < usec_add(v->timestamp, v->timeout))
605 return 0;
606
607 varlink_set_state(v, VARLINK_PENDING_TIMEOUT);
608
609 return 1;
610}
611
612static int varlink_dispatch_local_error(Varlink *v, const char *error) {
613 int r;
614
615 assert(v);
616 assert(error);
617
618 if (!v->reply_callback)
619 return 0;
620
621 r = v->reply_callback(v, NULL, error, VARLINK_REPLY_ERROR|VARLINK_REPLY_LOCAL, v->userdata);
622 if (r < 0)
623 log_debug_errno(r, "Reply callback returned error, ignoring: %m");
624
625 return 1;
626}
627
628static int varlink_dispatch_timeout(Varlink *v) {
629 assert(v);
630
631 if (v->state != VARLINK_PENDING_TIMEOUT)
632 return 0;
633
634 varlink_set_state(v, VARLINK_PROCESSING_TIMEOUT);
635 varlink_dispatch_local_error(v, VARLINK_ERROR_TIMEOUT);
636 varlink_close(v);
637
638 return 1;
639}
640
641static int varlink_dispatch_disconnect(Varlink *v) {
642 assert(v);
643
644 if (v->state != VARLINK_PENDING_DISCONNECT)
645 return 0;
646
647 varlink_set_state(v, VARLINK_PROCESSING_DISCONNECT);
648 varlink_dispatch_local_error(v, VARLINK_ERROR_DISCONNECTED);
649 varlink_close(v);
650
651 return 1;
652}
653
654static int varlink_sanitize_parameters(JsonVariant **v) {
655 assert(v);
656
657 /* Varlink always wants a parameters list, hence make one if the caller doesn't want any */
658 if (!*v)
659 return json_variant_new_object(v, NULL, 0);
660 else if (!json_variant_is_object(*v))
661 return -EINVAL;
662
663 return 0;
664}
665
666static int varlink_dispatch_reply(Varlink *v) {
667 _cleanup_(json_variant_unrefp) JsonVariant *parameters = NULL;
668 VarlinkReplyFlags flags = 0;
669 const char *error = NULL;
670 JsonVariant *e;
671 const char *k;
672 int r;
673
674 assert(v);
675
676 if (!IN_SET(v->state, VARLINK_AWAITING_REPLY, VARLINK_CALLING))
677 return 0;
678 if (!v->current)
679 return 0;
680
681 assert(v->n_pending > 0);
682
683 if (!json_variant_is_object(v->current))
684 goto invalid;
685
686 JSON_VARIANT_OBJECT_FOREACH(k, e, v->current) {
687
688 if (streq(k, "error")) {
689 if (error)
690 goto invalid;
691 if (!json_variant_is_string(e))
692 goto invalid;
693
694 error = json_variant_string(e);
695 flags |= VARLINK_REPLY_ERROR;
696
697 } else if (streq(k, "parameters")) {
698 if (parameters)
699 goto invalid;
700 if (!json_variant_is_object(e))
701 goto invalid;
702
703 parameters = json_variant_ref(e);
704
705 } else if (streq(k, "continues")) {
706 if (FLAGS_SET(flags, VARLINK_REPLY_CONTINUES))
707 goto invalid;
708
709 if (!json_variant_is_boolean(e))
710 goto invalid;
711
712 if (json_variant_boolean(e))
713 flags |= VARLINK_REPLY_CONTINUES;
714 } else
715 goto invalid;
716 }
717
718 if (error && FLAGS_SET(flags, VARLINK_REPLY_CONTINUES))
719 goto invalid;
720
721 r = varlink_sanitize_parameters(&parameters);
722 if (r < 0)
723 goto invalid;
724
725 if (v->state == VARLINK_AWAITING_REPLY) {
726 varlink_set_state(v, VARLINK_PROCESSING_REPLY);
727
728 if (v->reply_callback) {
729 r = v->reply_callback(v, parameters, error, flags, v->userdata);
730 if (r < 0)
731 log_debug_errno(r, "Reply callback returned error, ignoring: %m");
732 }
733
734 v->current = json_variant_unref(v->current);
735
736 if (v->state == VARLINK_PROCESSING_REPLY) {
737 assert(v->n_pending > 0);
738 v->n_pending--;
739
740 varlink_set_state(v, v->n_pending == 0 ? VARLINK_IDLE_CLIENT : VARLINK_AWAITING_REPLY);
741 }
742 } else {
743 assert(v->state == VARLINK_CALLING);
744
745 if (FLAGS_SET(flags, VARLINK_REPLY_CONTINUES))
746 goto invalid;
747
748 varlink_set_state(v, VARLINK_CALLED);
749 }
750
751 return 1;
752
753invalid:
754 varlink_set_state(v, VARLINK_PROCESSING_FAILURE);
755 varlink_dispatch_local_error(v, VARLINK_ERROR_PROTOCOL);
756 varlink_close(v);
757
758 return 1;
759}
760
761static int varlink_dispatch_method(Varlink *v) {
762 _cleanup_(json_variant_unrefp) JsonVariant *parameters = NULL;
763 VarlinkMethodFlags flags = 0;
764 const char *method = NULL, *error;
765 JsonVariant *e;
766 VarlinkMethod callback;
767 const char *k;
768 int r;
769
770 assert(v);
771
772 if (v->state != VARLINK_IDLE_SERVER)
773 return 0;
774 if (!v->current)
775 return 0;
776
777 if (!json_variant_is_object(v->current))
778 goto invalid;
779
780 JSON_VARIANT_OBJECT_FOREACH(k, e, v->current) {
781
782 if (streq(k, "method")) {
783 if (method)
784 goto invalid;
785 if (!json_variant_is_string(e))
786 goto invalid;
787
788 method = json_variant_string(e);
789
790 } else if (streq(k, "parameters")) {
791 if (parameters)
792 goto invalid;
793 if (!json_variant_is_object(e))
794 goto invalid;
795
796 parameters = json_variant_ref(e);
797
798 } else if (streq(k, "oneway")) {
799
800 if ((flags & (VARLINK_METHOD_ONEWAY|VARLINK_METHOD_MORE)) != 0)
801 goto invalid;
802
803 if (!json_variant_is_boolean(e))
804 goto invalid;
805
806 if (json_variant_boolean(e))
807 flags |= VARLINK_METHOD_ONEWAY;
808
809 } else if (streq(k, "more")) {
810
811 if ((flags & (VARLINK_METHOD_ONEWAY|VARLINK_METHOD_MORE)) != 0)
812 goto invalid;
813
814 if (!json_variant_is_boolean(e))
815 goto invalid;
816
817 if (json_variant_boolean(e))
818 flags |= VARLINK_METHOD_MORE;
819
820 } else
821 goto invalid;
822 }
823
824 if (!method)
825 goto invalid;
826
827 r = varlink_sanitize_parameters(&parameters);
828 if (r < 0)
829 goto fail;
830
831 varlink_set_state(v, (flags & VARLINK_METHOD_MORE) ? VARLINK_PROCESSING_METHOD_MORE :
832 (flags & VARLINK_METHOD_ONEWAY) ? VARLINK_PROCESSING_METHOD_ONEWAY :
833 VARLINK_PROCESSING_METHOD);
834
835 assert(v->server);
836
837 if (STR_IN_SET(method, "org.varlink.service.GetInfo", "org.varlink.service.GetInterface")) {
838 /* For now, we don't implement a single of varlink's own methods */
839 callback = NULL;
840 error = VARLINK_ERROR_METHOD_NOT_IMPLEMENTED;
841 } else if (startswith(method, "org.varlink.service.")) {
842 callback = NULL;
843 error = VARLINK_ERROR_METHOD_NOT_FOUND;
844 } else {
845 callback = hashmap_get(v->server->methods, method);
846 error = VARLINK_ERROR_METHOD_NOT_FOUND;
847 }
848
849 if (callback) {
850 r = callback(v, parameters, flags, v->userdata);
851 if (r < 0) {
852 log_debug_errno(r, "Callback for %s returned error: %m", method);
853
854 /* We got an error back from the callback. Propagate it to the client if the method call remains unanswered. */
855 if (!FLAGS_SET(flags, VARLINK_METHOD_ONEWAY)) {
856 r = varlink_errorb(v, VARLINK_ERROR_SYSTEM, JSON_BUILD_OBJECT(JSON_BUILD_PAIR("errno", JSON_BUILD_INTEGER(-r))));
857 if (r < 0)
858 return r;
859 }
860 }
861 } else if (!FLAGS_SET(flags, VARLINK_METHOD_ONEWAY)) {
862 assert(error);
863
864 r = varlink_errorb(v, error, JSON_BUILD_OBJECT(JSON_BUILD_PAIR("method", JSON_BUILD_STRING(method))));
865 if (r < 0)
866 return r;
867 }
868
869 switch (v->state) {
870
871 case VARLINK_PROCESSED_METHOD: /* Method call is fully processed */
872 case VARLINK_PROCESSING_METHOD_ONEWAY: /* ditto */
873 v->current = json_variant_unref(v->current);
874 varlink_set_state(v, VARLINK_IDLE_SERVER);
875 break;
876
877 case VARLINK_PROCESSING_METHOD: /* Method call wasn't replied to, will be replied to later */
878 varlink_set_state(v, VARLINK_PENDING_METHOD);
879 break;
880
881 case VARLINK_PROCESSED_METHOD_MORE: /* One reply for a "more" message was sent, more to come */
882 case VARLINK_PROCESSING_METHOD_MORE: /* No reply for a "more" message was sent, more to come */
883 varlink_set_state(v, VARLINK_PENDING_METHOD_MORE);
884 break;
885
886 default:
887 assert_not_reached("Unexpected state");
888
889 }
890
891 return r;
892
893invalid:
894 r = -EINVAL;
895
896fail:
897 varlink_set_state(v, VARLINK_PROCESSING_FAILURE);
898 varlink_dispatch_local_error(v, VARLINK_ERROR_PROTOCOL);
899 varlink_close(v);
900
901 return r;
902}
903
904int varlink_process(Varlink *v) {
905 int r;
906
907 assert_return(v, -EINVAL);
908
909 if (v->state == VARLINK_DISCONNECTED)
910 return -ENOTCONN;
911
912 varlink_ref(v);
913
914 r = varlink_write(v);
915 if (r != 0)
916 goto finish;
917
918 r = varlink_dispatch_reply(v);
919 if (r != 0)
920 goto finish;
921
922 r = varlink_dispatch_method(v);
923 if (r != 0)
924 goto finish;
925
926 r = varlink_parse_message(v);
927 if (r != 0)
928 goto finish;
929
930 r = varlink_read(v);
931 if (r != 0)
932 goto finish;
933
934 r = varlink_test_disconnect(v);
935 if (r != 0)
936 goto finish;
937
938 r = varlink_dispatch_disconnect(v);
939 if (r != 0)
940 goto finish;
941
942 r = varlink_test_timeout(v);
943 if (r != 0)
944 goto finish;
945
946 r = varlink_dispatch_timeout(v);
947 if (r != 0)
948 goto finish;
949
950finish:
951 if (r >= 0 && v->defer_event_source) {
952 int q;
953
954 /* If we did some processing, make sure we are called again soon */
955 q = sd_event_source_set_enabled(v->defer_event_source, r > 0 ? SD_EVENT_ON : SD_EVENT_OFF);
956 if (q < 0)
957 r = q;
958 }
959
960 if (r < 0) {
961 if (VARLINK_STATE_IS_ALIVE(v->state))
962 /* Initiate disconnection */
963 varlink_set_state(v, VARLINK_PENDING_DISCONNECT);
964 else
965 /* We failed while disconnecting, in that case close right away */
966 varlink_close(v);
967 }
968
969 varlink_unref(v);
970 return r;
971}
972
973static void handle_revents(Varlink *v, int revents) {
974 assert(v);
975
976 if (v->connecting) {
977 /* If we have seen POLLOUT or POLLHUP on a socket we are asynchronously waiting a connect()
978 * to complete on, we know we are ready. We don't read the connection error here though,
979 * we'll get the error on the next read() or write(). */
980 if ((revents & (POLLOUT|POLLHUP)) == 0)
981 return;
982
983 varlink_log(v, "Anynchronous connection completed.");
984 v->connecting = false;
985 } else {
986 /* Note that we don't care much about POLLIN/POLLOUT here, we'll just try reading and writing
987 * what we can. However, we do care about POLLHUP to detect connection termination even if we
988 * momentarily don't want to read nor write anything. */
989
990 if (!FLAGS_SET(revents, POLLHUP))
991 return;
992
993 varlink_log(v, "Got POLLHUP from socket.");
994 v->got_pollhup = true;
995 }
996}
997
998int varlink_wait(Varlink *v, usec_t timeout) {
999 struct timespec ts;
1000 struct pollfd pfd;
1001 int r, fd, events;
1002 usec_t t;
1003
1004 assert_return(v, -EINVAL);
1005 assert_return(!v->server, -ENOTTY);
1006
1007 if (v->state == VARLINK_DISCONNECTED)
1008 return -ENOTCONN;
1009
1010 r = varlink_get_timeout(v, &t);
1011 if (r < 0)
1012 return r;
1013 if (t != USEC_INFINITY) {
1014 usec_t n;
1015
1016 n = now(CLOCK_MONOTONIC);
1017 if (t < n)
1018 t = 0;
1019 else
1020 t = usec_sub_unsigned(t, n);
1021 }
1022
1023 if (timeout != USEC_INFINITY &&
1024 (t == USEC_INFINITY || timeout < t))
1025 t = timeout;
1026
1027 fd = varlink_get_fd(v);
1028 if (fd < 0)
1029 return fd;
1030
1031 events = varlink_get_events(v);
1032 if (events < 0)
1033 return events;
1034
1035 pfd = (struct pollfd) {
1036 .fd = fd,
1037 .events = events,
1038 };
1039
1040 r = ppoll(&pfd, 1,
1041 t == USEC_INFINITY ? NULL : timespec_store(&ts, t),
1042 NULL);
1043 if (r < 0)
1044 return -errno;
1045
1046 handle_revents(v, pfd.revents);
1047
1048 return r > 0 ? 1 : 0;
1049}
1050
1051int varlink_get_fd(Varlink *v) {
1052
1053 assert_return(v, -EINVAL);
1054
1055 if (v->state == VARLINK_DISCONNECTED)
1056 return -ENOTCONN;
1057 if (v->fd < 0)
1058 return -EBADF;
1059
1060 return v->fd;
1061}
1062
1063int varlink_get_events(Varlink *v) {
1064 int ret = 0;
1065
1066 assert_return(v, -EINVAL);
1067
1068 if (v->state == VARLINK_DISCONNECTED)
1069 return -ENOTCONN;
1070
1071 if (v->connecting) /* When processing an asynchronous connect(), we only wait for EPOLLOUT, which
1072 * tells us that the connection is now complete. Before that we should neither
1073 * write() or read() from the fd. */
1074 return EPOLLOUT;
1075
1076 if (!v->read_disconnected &&
1077 IN_SET(v->state, VARLINK_AWAITING_REPLY, VARLINK_CALLING, VARLINK_IDLE_SERVER) &&
1078 !v->current &&
1079 v->input_buffer_unscanned <= 0)
1080 ret |= EPOLLIN;
1081
1082 if (!v->write_disconnected &&
1083 v->output_buffer_size > 0)
1084 ret |= EPOLLOUT;
1085
1086 return ret;
1087}
1088
1089int varlink_get_timeout(Varlink *v, usec_t *ret) {
1090 assert_return(v, -EINVAL);
1091
1092 if (v->state == VARLINK_DISCONNECTED)
1093 return -ENOTCONN;
1094
1095 if (IN_SET(v->state, VARLINK_AWAITING_REPLY, VARLINK_CALLING) &&
1096 v->timeout != USEC_INFINITY) {
1097 if (ret)
1098 *ret = usec_add(v->timestamp, v->timeout);
1099 return 1;
1100 } else {
1101 if (ret)
1102 *ret = USEC_INFINITY;
1103 return 0;
1104 }
1105}
1106
1107int varlink_flush(Varlink *v) {
1108 int ret = 0, r;
1109
1110 assert_return(v, -EINVAL);
1111
1112 if (v->state == VARLINK_DISCONNECTED)
1113 return -ENOTCONN;
1114
1115 for (;;) {
1116 struct pollfd pfd;
1117
1118 if (v->output_buffer_size == 0)
1119 break;
1120 if (v->write_disconnected)
1121 return -ECONNRESET;
1122
1123 r = varlink_write(v);
1124 if (r < 0)
1125 return r;
1126 if (r > 0) {
1127 ret = 1;
1128 continue;
1129 }
1130
1131 pfd = (struct pollfd) {
1132 .fd = v->fd,
1133 .events = POLLOUT,
1134 };
1135
1136 if (poll(&pfd, 1, -1) < 0)
1137 return -errno;
1138
1139 handle_revents(v, pfd.revents);
1140 }
1141
1142 return ret;
1143}
1144
1145static void varlink_detach_server(Varlink *v) {
1146 assert(v);
1147
1148 if (!v->server)
1149 return;
1150
1151 if (v->server->by_uid &&
1152 v->ucred_acquired &&
1153 uid_is_valid(v->ucred.uid)) {
1154 unsigned c;
1155
1156 c = PTR_TO_UINT(hashmap_get(v->server->by_uid, UID_TO_PTR(v->ucred.uid)));
1157 assert(c > 0);
1158
1159 if (c == 1)
1160 (void) hashmap_remove(v->server->by_uid, UID_TO_PTR(v->ucred.uid));
1161 else
1162 (void) hashmap_replace(v->server->by_uid, UID_TO_PTR(v->ucred.uid), UINT_TO_PTR(c - 1));
1163 }
1164
1165 assert(v->server->n_connections > 0);
1166 v->server->n_connections--;
1167
1168 /* If this is a connection associated to a server, then let's disconnect the server and the
1169 * connection from each other. This drops the dangling reference that connect_callback() set up. */
1170 v->server = varlink_server_unref(v->server);
1171 varlink_unref(v);
1172}
1173
1174int varlink_close(Varlink *v) {
1175
1176 assert_return(v, -EINVAL);
1177
1178 if (v->state == VARLINK_DISCONNECTED)
1179 return 0;
1180
1181 varlink_set_state(v, VARLINK_DISCONNECTED);
1182
1183 /* Let's take a reference first, since varlink_detach_server() might drop the final (dangling) ref
1184 * which would destroy us before we can call varlink_clear() */
1185 varlink_ref(v);
1186 varlink_detach_server(v);
1187 varlink_clear(v);
1188 varlink_unref(v);
1189
1190 return 1;
1191}
1192
1193Varlink* varlink_flush_close_unref(Varlink *v) {
1194
1195 if (!v)
1196 return NULL;
1197
1198 (void) varlink_flush(v);
1199 (void) varlink_close(v);
1200
1201 return varlink_unref(v);
1202}
1203
1204static int varlink_enqueue_json(Varlink *v, JsonVariant *m) {
1205 _cleanup_free_ char *text = NULL;
1206 int r;
1207
1208 assert(v);
1209 assert(m);
1210
1211 r = json_variant_format(m, 0, &text);
1212 if (r < 0)
1213 return r;
2a04712c 1214 assert(text[r] == '\0');
d41bd96f
LP		 1215
1216 if (v->output_buffer_size + r + 1 > VARLINK_BUFFER_MAX)
1217 return -ENOBUFS;
1218
1219 varlink_log(v, "Sending message: %s", text);
1220
1221 if (v->output_buffer_size == 0) {
1222
1223 free_and_replace(v->output_buffer, text);
1224
1225 v->output_buffer_size = v->output_buffer_allocated = r + 1;
1226 v->output_buffer_index = 0;
1227
1228 } else if (v->output_buffer_index == 0) {
1229
1230 if (!GREEDY_REALLOC(v->output_buffer, v->output_buffer_allocated, v->output_buffer_size + r + 1))
1231 return -ENOMEM;
1232
1233 memcpy(v->output_buffer + v->output_buffer_size, text, r + 1);
1234 v->output_buffer_size += r + 1;
1235
1236 } else {
1237 char *n;
be44e091 1238 const size_t new_size = v->output_buffer_size + r + 1;
d41bd96f 1239
be44e091 1240 n = new(char, new_size);
d41bd96f
LP		 1241 if (!n)
1242 return -ENOMEM;
1243
1244 memcpy(mempcpy(n, v->output_buffer + v->output_buffer_index, v->output_buffer_size), text, r + 1);
1245
1246 free_and_replace(v->output_buffer, n);
be44e091 1247 v->output_buffer_allocated = v->output_buffer_size = new_size;
d41bd96f
LP		 1248 v->output_buffer_index = 0;
1249 }
1250
1251 return 0;
1252}
1253
1254int varlink_send(Varlink *v, const char *method, JsonVariant *parameters) {
1255 _cleanup_(json_variant_unrefp) JsonVariant *m = NULL;
1256 int r;
1257
1258 assert_return(v, -EINVAL);
1259 assert_return(method, -EINVAL);
1260
1261 if (v->state == VARLINK_DISCONNECTED)
1262 return -ENOTCONN;
1263 if (!IN_SET(v->state, VARLINK_IDLE_CLIENT, VARLINK_AWAITING_REPLY))
1264 return -EBUSY;
1265
1266 r = varlink_sanitize_parameters(&parameters);
1267 if (r < 0)
1268 return r;
1269
1270 r = json_build(&m, JSON_BUILD_OBJECT(
1271 JSON_BUILD_PAIR("method", JSON_BUILD_STRING(method)),
1272 JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters)),
1273 JSON_BUILD_PAIR("oneway", JSON_BUILD_BOOLEAN(true))));
1274 if (r < 0)
1275 return r;
1276
1277 r = varlink_enqueue_json(v, m);
1278 if (r < 0)
1279 return r;
1280
1281 /* No state change here, this is one-way only after all */
1282 v->timestamp = now(CLOCK_MONOTONIC);
1283 return 0;
1284}
1285
1286int varlink_sendb(Varlink *v, const char *method, ...) {
1287 _cleanup_(json_variant_unrefp) JsonVariant *parameters = NULL;
1288 va_list ap;
1289 int r;
1290
1291 assert_return(v, -EINVAL);
1292
1293 va_start(ap, method);
1294 r = json_buildv(&parameters, ap);
1295 va_end(ap);
1296
1297 if (r < 0)
1298 return r;
1299
1300 return varlink_send(v, method, parameters);
1301}
1302
1303int varlink_invoke(Varlink *v, const char *method, JsonVariant *parameters) {
1304 _cleanup_(json_variant_unrefp) JsonVariant *m = NULL;
1305 int r;
1306
1307 assert_return(v, -EINVAL);
1308 assert_return(method, -EINVAL);
1309
1310 if (v->state == VARLINK_DISCONNECTED)
1311 return -ENOTCONN;
1312 if (!IN_SET(v->state, VARLINK_IDLE_CLIENT, VARLINK_AWAITING_REPLY))
1313 return -EBUSY;
1314
1315 r = varlink_sanitize_parameters(&parameters);
1316 if (r < 0)
1317 return r;
1318
1319 r = json_build(&m, JSON_BUILD_OBJECT(
1320 JSON_BUILD_PAIR("method", JSON_BUILD_STRING(method)),
1321 JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters))));
1322 if (r < 0)
1323 return r;
1324
1325 r = varlink_enqueue_json(v, m);
1326 if (r < 0)
1327 return r;
1328
1329 varlink_set_state(v, VARLINK_AWAITING_REPLY);
1330 v->n_pending++;
1331 v->timestamp = now(CLOCK_MONOTONIC);
1332
1333 return 0;
1334}
1335
1336int varlink_invokeb(Varlink *v, const char *method, ...) {
1337 _cleanup_(json_variant_unrefp) JsonVariant *parameters = NULL;
1338 va_list ap;
1339 int r;
1340
1341 assert_return(v, -EINVAL);
1342
1343 va_start(ap, method);
1344 r = json_buildv(&parameters, ap);
1345 va_end(ap);
1346
1347 if (r < 0)
1348 return r;
1349
1350 return varlink_invoke(v, method, parameters);
1351}
1352
1353int varlink_call(
1354 Varlink *v,
1355 const char *method,
1356 JsonVariant *parameters,
1357 JsonVariant **ret_parameters,
1358 const char **ret_error_id,
1359 VarlinkReplyFlags *ret_flags) {
1360
1361 _cleanup_(json_variant_unrefp) JsonVariant *m = NULL;
1362 int r;
1363
1364 assert_return(v, -EINVAL);
1365 assert_return(method, -EINVAL);
1366
1367 if (v->state == VARLINK_DISCONNECTED)
1368 return -ENOTCONN;
1369 if (!IN_SET(v->state, VARLINK_IDLE_CLIENT))
1370 return -EBUSY;
1371
1372 assert(v->n_pending == 0); /* n_pending can't be > 0 if we are in VARLINK_IDLE_CLIENT state */
1373
1374 r = varlink_sanitize_parameters(&parameters);
1375 if (r < 0)
1376 return r;
1377
1378 r = json_build(&m, JSON_BUILD_OBJECT(
1379 JSON_BUILD_PAIR("method", JSON_BUILD_STRING(method)),
1380 JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters))));
1381 if (r < 0)
1382 return r;
1383
1384 r = varlink_enqueue_json(v, m);
1385 if (r < 0)
1386 return r;
1387
1388 varlink_set_state(v, VARLINK_CALLING);
1389 v->n_pending++;
1390 v->timestamp = now(CLOCK_MONOTONIC);
1391
1392 while (v->state == VARLINK_CALLING) {
1393
1394 r = varlink_process(v);
1395 if (r < 0)
1396 return r;
1397 if (r > 0)
1398 continue;
1399
1400 r = varlink_wait(v, USEC_INFINITY);
1401 if (r < 0)
1402 return r;
1403 }
1404
1405 switch (v->state) {
1406
1407 case VARLINK_CALLED:
1408 assert(v->current);
1409
1410 json_variant_unref(v->reply);
1411 v->reply = TAKE_PTR(v->current);
1412
1413 varlink_set_state(v, VARLINK_IDLE_CLIENT);
1414 assert(v->n_pending == 1);
1415 v->n_pending--;
1416
1417 if (ret_parameters)
1418 *ret_parameters = json_variant_by_key(v->reply, "parameters");
1419 if (ret_error_id)
1420 *ret_error_id = json_variant_string(json_variant_by_key(v->reply, "error"));
1421 if (ret_flags)
1422 *ret_flags = 0;
1423
1424 return 1;
1425
1426 case VARLINK_PENDING_DISCONNECT:
1427 case VARLINK_DISCONNECTED:
1428 return -ECONNRESET;
1429
1430 case VARLINK_PENDING_TIMEOUT:
1431 return -ETIME;
1432
1433 default:
1434 assert_not_reached("Unexpected state after method call.");
1435 }
1436}
1437
1438int varlink_callb(
1439 Varlink *v,
1440 const char *method,
1441 JsonVariant **ret_parameters,
1442 const char **ret_error_id,
1443 VarlinkReplyFlags *ret_flags, ...) {
1444
1445 _cleanup_(json_variant_unrefp) JsonVariant *parameters = NULL;
1446 va_list ap;
1447 int r;
1448
1449 assert_return(v, -EINVAL);
1450
1451 va_start(ap, ret_flags);
1452 r = json_buildv(&parameters, ap);
1453 va_end(ap);
1454
1455 if (r < 0)
1456 return r;
1457
1458 return varlink_call(v, method, parameters, ret_parameters, ret_error_id, ret_flags);
1459}
1460
1461int varlink_reply(Varlink *v, JsonVariant *parameters) {
1462 _cleanup_(json_variant_unrefp) JsonVariant *m = NULL;
1463 int r;
1464
1465 assert_return(v, -EINVAL);
1466
1467 if (v->state == VARLINK_DISCONNECTED)
1468 return -ENOTCONN;
1469 if (!IN_SET(v->state,
1470 VARLINK_PROCESSING_METHOD, VARLINK_PROCESSING_METHOD_MORE,
1471 VARLINK_PENDING_METHOD, VARLINK_PENDING_METHOD_MORE))
1472 return -EBUSY;
1473
1474 r = varlink_sanitize_parameters(&parameters);
1475 if (r < 0)
1476 return r;
1477
1478 r = json_build(&m, JSON_BUILD_OBJECT(JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters))));
1479 if (r < 0)
1480 return r;
1481
1482 r = varlink_enqueue_json(v, m);
1483 if (r < 0)
1484 return r;
1485
1486 if (IN_SET(v->state, VARLINK_PENDING_METHOD, VARLINK_PENDING_METHOD_MORE)) {
1487 /* We just replied to a method call that was let hanging for a while (i.e. we were outside of
1488 * the varlink_dispatch_method() stack frame), which means with this reply we are ready to
1489 * process further messages. */
1490 v->current = json_variant_unref(v->current);
1491 varlink_set_state(v, VARLINK_IDLE_SERVER);
1492 } else
1493 /* We replied to a method call from within the varlink_dispatch_method() stack frame), which
1494 * means we should it handle the rest of the state engine. */
1495 varlink_set_state(v, VARLINK_PROCESSED_METHOD);
1496
1497 return 1;
1498}
1499
1500int varlink_replyb(Varlink *v, ...) {
1501 _cleanup_(json_variant_unrefp) JsonVariant *parameters = NULL;
1502 va_list ap;
1503 int r;
1504
1505 assert_return(v, -EINVAL);
1506
1507 va_start(ap, v);
1508 r = json_buildv(&parameters, ap);
1509 va_end(ap);
1510
1511 if (r < 0)
1512 return r;
1513
1514 return varlink_reply(v, parameters);
1515}
1516
1517int varlink_error(Varlink *v, const char *error_id, JsonVariant *parameters) {
1518 _cleanup_(json_variant_unrefp) JsonVariant *m = NULL;
1519 int r;
1520
1521 assert_return(v, -EINVAL);
1522 assert_return(error_id, -EINVAL);
1523
1524 if (v->state == VARLINK_DISCONNECTED)
1525 return -ENOTCONN;
1526 if (!IN_SET(v->state,
1527 VARLINK_PROCESSING_METHOD, VARLINK_PROCESSING_METHOD_MORE,
1528 VARLINK_PENDING_METHOD, VARLINK_PENDING_METHOD_MORE))
1529 return -EBUSY;
1530
1531 r = varlink_sanitize_parameters(&parameters);
1532 if (r < 0)
1533 return r;
1534
1535 r = json_build(&m, JSON_BUILD_OBJECT(
1536 JSON_BUILD_PAIR("error", JSON_BUILD_STRING(error_id)),
1537 JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters))));
1538 if (r < 0)
1539 return r;
1540
1541 r = varlink_enqueue_json(v, m);
1542 if (r < 0)
1543 return r;
1544
1545 if (IN_SET(v->state, VARLINK_PENDING_METHOD, VARLINK_PENDING_METHOD_MORE)) {
1546 v->current = json_variant_unref(v->current);
1547 varlink_set_state(v, VARLINK_IDLE_SERVER);
1548 } else
1549 varlink_set_state(v, VARLINK_PROCESSED_METHOD);
1550
1551 return 1;
1552}
1553
1554int varlink_errorb(Varlink *v, const char *error_id, ...) {
1555 _cleanup_(json_variant_unrefp) JsonVariant *parameters = NULL;
1556 va_list ap;
1557 int r;
1558
1559 assert_return(v, -EINVAL);
1560 assert_return(error_id, -EINVAL);
1561
1562 va_start(ap, error_id);
1563 r = json_buildv(&parameters, ap);
1564 va_end(ap);
1565
1566 if (r < 0)
1567 return r;
1568
1569 return varlink_error(v, error_id, parameters);
1570}
1571
1572int varlink_error_invalid_parameter(Varlink *v, JsonVariant *parameters) {
1573
1574 assert_return(v, -EINVAL);
1575 assert_return(parameters, -EINVAL);
1576
1577 /* We expect to be called in one of two ways: the 'parameters' argument is a string variant in which
1578 * case it is the parameter key name that is invalid. Or the 'parameters' argument is an object
1579 * variant in which case we'll pull out the first key. The latter mode is useful in functions that
1580 * don't expect any arguments. */
1581
1582 if (json_variant_is_string(parameters))
1583 return varlink_error(v, VARLINK_ERROR_INVALID_PARAMETER, parameters);
1584
1585 if (json_variant_is_object(parameters) &&
1586 json_variant_elements(parameters) > 0)
1587 return varlink_error(v, VARLINK_ERROR_INVALID_PARAMETER,
1588 json_variant_by_index(parameters, 0));
1589
1590 return -EINVAL;
1591}
1592
1593int varlink_notify(Varlink *v, JsonVariant *parameters) {
1594 _cleanup_(json_variant_unrefp) JsonVariant *m = NULL;
1595 int r;
1596
1597 assert_return(v, -EINVAL);
1598
1599 if (v->state == VARLINK_DISCONNECTED)
1600 return -ENOTCONN;
1601 if (!IN_SET(v->state, VARLINK_PROCESSING_METHOD_MORE, VARLINK_PENDING_METHOD_MORE))
1602 return -EBUSY;
1603
1604 r = varlink_sanitize_parameters(&parameters);
1605 if (r < 0)
1606 return r;
1607
1608 r = json_build(&m, JSON_BUILD_OBJECT(
1609 JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters)),
1610 JSON_BUILD_PAIR("continues", JSON_BUILD_BOOLEAN(true))));
1611 if (r < 0)
1612 return r;
1613
1614 r = varlink_enqueue_json(v, m);
1615 if (r < 0)
1616 return r;
1617
1618 /* No state change, as more is coming */
1619 return 1;
1620}
1621
1622int varlink_notifyb(Varlink *v, ...) {
1623 _cleanup_(json_variant_unrefp) JsonVariant *parameters = NULL;
1624 va_list ap;
1625 int r;
1626
1627 assert_return(v, -EINVAL);
1628
1629 va_start(ap, v);
1630 r = json_buildv(&parameters, ap);
1631 va_end(ap);
1632
1633 if (r < 0)
1634 return r;
1635
1636 return varlink_notify(v, parameters);
1637}
1638
1639int varlink_bind_reply(Varlink *v, VarlinkReply callback) {
1640 assert_return(v, -EINVAL);
1641
1642 if (callback && v->reply_callback && callback != v->reply_callback)
1643 return -EBUSY;
1644
1645 v->reply_callback = callback;
1646
1647 return 0;
1648}
1649
1650void* varlink_set_userdata(Varlink *v, void *userdata) {
1651 void *old;
1652
1653 assert_return(v, NULL);
1654
1655 old = v->userdata;
1656 v->userdata = userdata;
1657
1658 return old;
1659}
1660
1661void* varlink_get_userdata(Varlink *v) {
1662 assert_return(v, NULL);
1663
1664 return v->userdata;
1665}
1666
1667static int varlink_acquire_ucred(Varlink *v) {
1668 int r;
1669
1670 assert(v);
1671
1672 if (v->ucred_acquired)
1673 return 0;
1674
1675 r = getpeercred(v->fd, &v->ucred);
1676 if (r < 0)
1677 return r;
1678
1679 v->ucred_acquired = true;
1680 return 0;
1681}
1682
1683int varlink_get_peer_uid(Varlink *v, uid_t *ret) {
1684 int r;
1685
1686 assert_return(v, -EINVAL);
1687 assert_return(ret, -EINVAL);
1688
1689 r = varlink_acquire_ucred(v);
1690 if (r < 0)
1691 return r;
1692
1693 if (!uid_is_valid(v->ucred.uid))
1694 return -ENODATA;
1695
1696 *ret = v->ucred.uid;
1697 return 0;
1698}
1699
1700int varlink_get_peer_pid(Varlink *v, pid_t *ret) {
1701 int r;
1702
1703 assert_return(v, -EINVAL);
1704 assert_return(ret, -EINVAL);
1705
1706 r = varlink_acquire_ucred(v);
1707 if (r < 0)
1708 return r;
1709
1710 if (!pid_is_valid(v->ucred.pid))
1711 return -ENODATA;
1712
1713 *ret = v->ucred.pid;
1714 return 0;
1715}
1716
1717int varlink_set_relative_timeout(Varlink *v, usec_t timeout) {
1718 assert_return(v, -EINVAL);
1719 assert_return(timeout > 0, -EINVAL);
1720
1721 v->timeout = timeout;
1722 return 0;
1723}
1724
1725VarlinkServer *varlink_get_server(Varlink *v) {
1726 assert_return(v, NULL);
1727
1728 return v->server;
1729}
1730
1731int varlink_set_description(Varlink *v, const char *description) {
1732 assert_return(v, -EINVAL);
1733
1734 return free_and_strdup(&v->description, description);
1735}
1736
1737static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
1738 Varlink *v = userdata;
1739
1740 assert(s);
1741 assert(v);
1742
1743 handle_revents(v, revents);
1744 (void) varlink_process(v);
1745
1746 return 1;
1747}
1748
1749static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) {
1750 Varlink *v = userdata;
1751
1752 assert(s);
1753 assert(v);
1754
1755 (void) varlink_process(v);
1756 return 1;
1757}
1758
1759static int defer_callback(sd_event_source *s, void *userdata) {
1760 Varlink *v = userdata;
1761
1762 assert(s);
1763 assert(v);
1764
1765 (void) varlink_process(v);
1766 return 1;
1767}
1768
1769static int prepare_callback(sd_event_source *s, void *userdata) {
1770 Varlink *v = userdata;
1771 int r, e;
1772 usec_t until;
1773
1774 assert(s);
1775 assert(v);
1776
1777 e = varlink_get_events(v);
1778 if (e < 0)
1779 return e;
1780
1781 r = sd_event_source_set_io_events(v->io_event_source, e);
1782 if (r < 0)
1783 return r;
1784
1785 r = varlink_get_timeout(v, &until);
1786 if (r < 0)
1787 return r;
1788 if (r > 0) {
1789 r = sd_event_source_set_time(v->time_event_source, until);
1790 if (r < 0)
1791 return r;
1792 }
1793
1794 r = sd_event_source_set_enabled(v->time_event_source, r > 0 ? SD_EVENT_ON : SD_EVENT_OFF);
1795 if (r < 0)
1796 return r;
1797
1798 return 1;
1799}
1800
1801static int quit_callback(sd_event_source *event, void *userdata) {
1802 Varlink *v = userdata;
1803
1804 assert(event);
1805 assert(v);
1806
1807 varlink_flush(v);
1808 varlink_close(v);
1809
1810 return 1;
1811}
1812
1813int varlink_attach_event(Varlink *v, sd_event *e, int64_t priority) {
1814 int r;
1815
1816 assert_return(v, -EINVAL);
1817 assert_return(!v->event, -EBUSY);
1818
1819 if (e)
1820 v->event = sd_event_ref(e);
1821 else {
1822 r = sd_event_default(&v->event);
1823 if (r < 0)
1824 return r;
1825 }
1826
1827 r = sd_event_add_time(v->event, &v->time_event_source, CLOCK_MONOTONIC, 0, 0, time_callback, v);
1828 if (r < 0)
1829 goto fail;
1830
1831 r = sd_event_source_set_priority(v->time_event_source, priority);
1832 if (r < 0)
1833 goto fail;
1834
1835 (void) sd_event_source_set_description(v->time_event_source, "varlink-time");
1836
1837 r = sd_event_add_exit(v->event, &v->quit_event_source, quit_callback, v);
1838 if (r < 0)
1839 goto fail;
1840
1841 r = sd_event_source_set_priority(v->quit_event_source, priority);
1842 if (r < 0)
1843 goto fail;
1844
1845 (void) sd_event_source_set_description(v->quit_event_source, "varlink-quit");
1846
1847 r = sd_event_add_io(v->event, &v->io_event_source, v->fd, 0, io_callback, v);
1848 if (r < 0)
1849 goto fail;
1850
1851 r = sd_event_source_set_prepare(v->io_event_source, prepare_callback);
1852 if (r < 0)
1853 goto fail;
1854
1855 r = sd_event_source_set_priority(v->io_event_source, priority);
1856 if (r < 0)
1857 goto fail;
1858
1859 (void) sd_event_source_set_description(v->io_event_source, "varlink-io");
1860
1861 r = sd_event_add_defer(v->event, &v->defer_event_source, defer_callback, v);
1862 if (r < 0)
1863 goto fail;
1864
1865 r = sd_event_source_set_priority(v->defer_event_source, priority);
1866 if (r < 0)
1867 goto fail;
1868
1869 (void) sd_event_source_set_description(v->defer_event_source, "varlink-defer");
1870
1871 return 0;
1872
1873fail:
1874 varlink_detach_event(v);
1875 return r;
1876}
1877
1878
1879void varlink_detach_event(Varlink *v) {
1880 if (!v)
1881 return;
1882
1883 varlink_detach_event_sources(v);
1884
1885 v->event = sd_event_unref(v->event);
1886}
1887
1888sd_event *varlink_get_event(Varlink *v) {
1889 assert_return(v, NULL);
1890
1891 return v->event;
1892}
1893
1894int varlink_server_new(VarlinkServer **ret, VarlinkServerFlags flags) {
1895 VarlinkServer *s;
1896
1897 assert_return(ret, -EINVAL);
1898 assert_return((flags & ~_VARLINK_SERVER_FLAGS_ALL) == 0, -EINVAL);
1899
1900 s = new(VarlinkServer, 1);
1901 if (!s)
1902 return -ENOMEM;
1903
1904 *s = (VarlinkServer) {
1905 .n_ref = 1,
1906 .flags = flags,
1907 .connections_max = varlink_server_connections_max(NULL),
1908 .connections_per_uid_max = varlink_server_connections_per_uid_max(NULL),
1909 };
1910
1911 *ret = s;
1912 return 0;
1913}
1914
1915static VarlinkServer* varlink_server_destroy(VarlinkServer *s) {
1916 char *m;
1917
1918 if (!s)
1919 return NULL;
1920
1921 varlink_server_shutdown(s);
1922
1923 while ((m = hashmap_steal_first_key(s->methods)))
1924 free(m);
1925
1926 hashmap_free(s->methods);
1927 hashmap_free(s->by_uid);
1928
1929 sd_event_unref(s->event);
1930
1931 free(s->description);
1932
1933 return mfree(s);
1934}
1935
1936DEFINE_TRIVIAL_REF_UNREF_FUNC(VarlinkServer, varlink_server, varlink_server_destroy);
1937
1938static int validate_connection(VarlinkServer *server, const struct ucred *ucred) {
1939 int allowed = -1;
1940
1941 assert(server);
1942 assert(ucred);
1943
1944 if (FLAGS_SET(server->flags, VARLINK_SERVER_ROOT_ONLY))
1945 allowed = ucred->uid == 0;
1946
1947 if (FLAGS_SET(server->flags, VARLINK_SERVER_MYSELF_ONLY))
1948 allowed = allowed > 0 || ucred->uid == getuid();
1949
1950 if (allowed == 0) { /* Allow access when it is explicitly allowed or when neither
1951 * VARLINK_SERVER_ROOT_ONLY nor VARLINK_SERVER_MYSELF_ONLY are specified. */
1952 varlink_server_log(server, "Unprivileged client attempted connection, refusing.");
1953 return 0;
1954 }
1955
1956 if (server->n_connections >= server->connections_max) {
1957 varlink_server_log(server, "Connection limit of %u reached, refusing.", server->connections_max);
1958 return 0;
1959 }
1960
1961 if (FLAGS_SET(server->flags, VARLINK_SERVER_ACCOUNT_UID)) {
1962 unsigned c;
1963
1964 if (!uid_is_valid(ucred->uid)) {
1965 varlink_server_log(server, "Client with invalid UID attempted connection, refusing.");
1966 return 0;
1967 }
1968
1969 c = PTR_TO_UINT(hashmap_get(server->by_uid, UID_TO_PTR(ucred->uid)));
1970 if (c >= server->connections_per_uid_max) {
1971 varlink_server_log(server, "Per-UID connection limit of %u reached, refusing.",
1972 server->connections_per_uid_max);
1973 return 0;
1974 }
1975 }
1976
1977 return 1;
1978}
1979
1980static int count_connection(VarlinkServer *server, struct ucred *ucred) {
1981 unsigned c;
1982 int r;
1983
1984 assert(server);
1985 assert(ucred);
1986
1987 server->n_connections++;
1988
1989 if (FLAGS_SET(server->flags, VARLINK_SERVER_ACCOUNT_UID)) {
1990 r = hashmap_ensure_allocated(&server->by_uid, NULL);
1991 if (r < 0)
1992 return log_debug_errno(r, "Failed to allocate UID hash table: %m");
1993
1994 c = PTR_TO_UINT(hashmap_get(server->by_uid, UID_TO_PTR(ucred->uid)));
1995
1996 varlink_server_log(server, "Connections of user " UID_FMT ": %u (of %u max)",
1997 ucred->uid, c, server->connections_per_uid_max);
1998
1999 r = hashmap_replace(server->by_uid, UID_TO_PTR(ucred->uid), UINT_TO_PTR(c + 1));
2000 if (r < 0)
2001 return log_debug_errno(r, "Failed to increment counter in UID hash table: %m");
2002 }
2003
2004 return 0;
2005}
2006
2007int varlink_server_add_connection(VarlinkServer *server, int fd, Varlink **ret) {
2008 _cleanup_(varlink_unrefp) Varlink *v = NULL;
2009 bool ucred_acquired;
2010 struct ucred ucred;
2011 int r;
2012
2013 assert_return(server, -EINVAL);
2014 assert_return(fd >= 0, -EBADF);
2015
2016 if ((server->flags & (VARLINK_SERVER_ROOT_ONLY|VARLINK_SERVER_ACCOUNT_UID)) != 0) {
2017 r = getpeercred(fd, &ucred);
2018 if (r < 0)
2019 return varlink_server_log_errno(server, r, "Failed to acquire peer credentials of incoming socket, refusing: %m");
2020
2021 ucred_acquired = true;
2022
2023 r = validate_connection(server, &ucred);
2024 if (r < 0)
2025 return r;
2026 if (r == 0)
2027 return -EPERM;
2028 } else
2029 ucred_acquired = false;
2030
2031 r = varlink_new(&v);
2032 if (r < 0)
2033 return varlink_server_log_errno(server, r, "Failed to allocate connection object: %m");
2034
2035 r = count_connection(server, &ucred);
2036 if (r < 0)
2037 return r;
2038
2039 v->fd = fd;
2040 v->userdata = server->userdata;
2041 if (ucred_acquired) {
2042 v->ucred = ucred;
2043 v->ucred_acquired = true;
2044 }
2045
2046 (void) asprintf(&v->description, "%s-%i", server->description ?: "varlink", v->fd);
2047
2048 /* Link up the server and the connection, and take reference in both directions. Note that the
2049 * reference on the connection is left dangling. It will be dropped when the connection is closed,
2050 * which happens in varlink_close(), including in the event loop quit callback. */
2051 v->server = varlink_server_ref(server);
2052 varlink_ref(v);
2053
2054 varlink_set_state(v, VARLINK_IDLE_SERVER);
2055
2056 r = varlink_attach_event(v, server->event, server->event_priority);
2057 if (r < 0) {
2058 varlink_log_errno(v, r, "Failed to attach new connection: %m");
2059 v->fd = -1; /* take the fd out of the connection again */
2060 varlink_close(v);
2061 return r;
2062 }
2063
2064 if (ret)
2065 *ret = v;
2066
2067 return 0;
2068}
2069
2070static int connect_callback(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2071 VarlinkServerSocket *ss = userdata;
2072 _cleanup_close_ int cfd = -1;
2073 Varlink *v = NULL;
2074 int r;
2075
2076 assert(source);
2077 assert(ss);
2078
2079 varlink_server_log(ss->server, "New incoming connection.");
2080
2081 cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
2082 if (cfd < 0) {
2083 if (ERRNO_IS_ACCEPT_AGAIN(errno))
2084 return 0;
2085
2086 return varlink_server_log_errno(ss->server, errno, "Failed to accept incoming socket: %m");
2087 }
2088
2089 r = varlink_server_add_connection(ss->server, cfd, &v);
2090 if (r < 0)
2091 return 0;
2092
2093 TAKE_FD(cfd);
2094
2095 if (ss->server->connect_callback) {
2096 r = ss->server->connect_callback(ss->server, v, ss->server->userdata);
2097 if (r < 0) {
2098 varlink_log_errno(v, r, "Connection callback returned error, disconnecting client: %m");
2099 varlink_close(v);
2100 return 0;
2101 }
2102 }
2103
2104 return 0;
2105}
2106
2107int varlink_server_listen_fd(VarlinkServer *s, int fd) {
2108 _cleanup_free_ VarlinkServerSocket *ss = NULL;
2109 int r;
2110
2111 assert_return(s, -EINVAL);
2112 assert_return(fd >= 0, -EBADF);
2113
2114 r = fd_nonblock(fd, true);
2115 if (r < 0)
2116 return r;
2117
2118 ss = new(VarlinkServerSocket, 1);
2119 if (!ss)
2120 return -ENOMEM;
2121
2122 *ss = (VarlinkServerSocket) {
2123 .server = s,
2124 .fd = fd,
2125 };
2126
2127 if (s->event) {
2128 _cleanup_(sd_event_source_unrefp) sd_event_source *es = NULL;
2129
2130 r = sd_event_add_io(s->event, &es, fd, EPOLLIN, connect_callback, ss);
2131 if (r < 0)
2132 return r;
2133
2134 r = sd_event_source_set_priority(ss->event_source, s->event_priority);
2135 if (r < 0)
2136 return r;
2137 }
2138
2139 LIST_PREPEND(sockets, s->sockets, TAKE_PTR(ss));
2140 return 0;
2141}
2142
2143int varlink_server_listen_address(VarlinkServer *s, const char *address, mode_t m) {
2144 union sockaddr_union sockaddr;
2145 _cleanup_close_ int fd = -1;
2146 int r;
2147
2148 assert_return(s, -EINVAL);
2149 assert_return(address, -EINVAL);
2150 assert_return((m & ~0777) == 0, -EINVAL);
2151
2152 r = sockaddr_un_set_path(&sockaddr.un, address);
2153 if (r < 0)
2154 return r;
2155
2156 fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
2157 if (fd < 0)
2158 return -errno;
2159
2160 (void) sockaddr_un_unlink(&sockaddr.un);
2161
2162 RUN_WITH_UMASK(~m & 0777)
2163 if (bind(fd, &sockaddr.sa, SOCKADDR_UN_LEN(sockaddr.un)) < 0)
2164 return -errno;
2165
2166 if (listen(fd, SOMAXCONN) < 0)
2167 return -errno;
2168
2169 r = varlink_server_listen_fd(s, fd);
2170 if (r < 0)
2171 return r;
2172
2173 TAKE_FD(fd);
2174 return 0;
2175}
2176
2177void* varlink_server_set_userdata(VarlinkServer *s, void *userdata) {
2178 void *ret;
2179
2180 assert_return(s, NULL);
2181
2182 ret = s->userdata;
2183 s->userdata = userdata;
2184
2185 return ret;
2186}
2187
2188void* varlink_server_get_userdata(VarlinkServer *s) {
2189 assert_return(s, NULL);
2190
2191 return s->userdata;
2192}
2193
2194static VarlinkServerSocket* varlink_server_socket_destroy(VarlinkServerSocket *ss) {
2195 if (!ss)
2196 return NULL;
2197
2198 if (ss->server)
2199 LIST_REMOVE(sockets, ss->server->sockets, ss);
2200
1d3fe304 2201 sd_event_source_disable_unref(ss->event_source);
d41bd96f
LP		 2202
2203 free(ss->address);
2204 safe_close(ss->fd);
2205
2206 return mfree(ss);
2207}
2208
2209int varlink_server_shutdown(VarlinkServer *s) {
2210 assert_return(s, -EINVAL);
2211
2212 while (s->sockets)
2213 varlink_server_socket_destroy(s->sockets);
2214
2215 return 0;
2216}
2217
2218int varlink_server_attach_event(VarlinkServer *s, sd_event *e, int64_t priority) {
2219 VarlinkServerSocket *ss;
2220 int r;
2221
2222 assert_return(s, -EINVAL);
2223 assert_return(!s->event, -EBUSY);
2224
2225 if (e)
2226 s->event = sd_event_ref(e);
2227 else {
2228 r = sd_event_default(&s->event);
2229 if (r < 0)
2230 return r;
2231 }
2232
2233 LIST_FOREACH(sockets, ss, s->sockets) {
2234 assert(!ss->event_source);
2235
2236 r = sd_event_add_io(s->event, &ss->event_source, ss->fd, EPOLLIN, connect_callback, ss);
2237 if (r < 0)
2238 goto fail;
2239
2240 r = sd_event_source_set_priority(ss->event_source, priority);
2241 if (r < 0)
2242 goto fail;
2243 }
2244
2245 s->event_priority = priority;
2246 return 0;
2247
2248fail:
2249 varlink_server_detach_event(s);
2250 return r;
2251}
2252
2253int varlink_server_detach_event(VarlinkServer *s) {
2254 VarlinkServerSocket *ss;
2255
2256 assert_return(s, -EINVAL);
2257
2258 LIST_FOREACH(sockets, ss, s->sockets) {
2259
2260 if (!ss->event_source)
2261 continue;
2262
2263 (void) sd_event_source_set_enabled(ss->event_source, SD_EVENT_OFF);
2264 ss->event_source = sd_event_source_unref(ss->event_source);
2265 }
2266
2267 sd_event_unref(s->event);
2268 return 0;
2269}
2270
2271sd_event *varlink_server_get_event(VarlinkServer *s) {
2272 assert_return(s, NULL);
2273
2274 return s->event;
2275}
2276
2277int varlink_server_bind_method(VarlinkServer *s, const char *method, VarlinkMethod callback) {
2278 char *m;
2279 int r;
2280
2281 assert_return(s, -EINVAL);
2282 assert_return(method, -EINVAL);
2283 assert_return(callback, -EINVAL);
2284
2285 if (startswith(method, "org.varlink.service."))
2286 return -EEXIST;
2287
2288 r = hashmap_ensure_allocated(&s->methods, &string_hash_ops);
2289 if (r < 0)
2290 return r;
2291
2292 m = strdup(method);
2293 if (!m)
2294 return -ENOMEM;
2295
2296 r = hashmap_put(s->methods, m, callback);
2297 if (r < 0) {
2298 free(m);
2299 return r;
2300 }
2301
2302 return 0;
2303}
2304
2305int varlink_server_bind_method_many_internal(VarlinkServer *s, ...) {
2306 va_list ap;
e7b93f97 2307 int r = 0;
d41bd96f
LP		 2308
2309 assert_return(s, -EINVAL);
2310
2311 va_start(ap, s);
2312 for (;;) {
2313 VarlinkMethod callback;
2314 const char *method;
2315
2316 method = va_arg(ap, const char *);
2317 if (!method)
2318 break;
2319
2320 callback = va_arg(ap, VarlinkMethod);
2321
2322 r = varlink_server_bind_method(s, method, callback);
2323 if (r < 0)
e7b93f97 2324 break;
d41bd96f 2325 }
e7b93f97 2326 va_end(ap);
d41bd96f 2327
e7b93f97 2328 return r;
d41bd96f
LP		 2329}
2330
2331int varlink_server_bind_connect(VarlinkServer *s, VarlinkConnect callback) {
2332 assert_return(s, -EINVAL);
2333
2334 if (callback && s->connect_callback && callback != s->connect_callback)
2335 return -EBUSY;
2336
2337 s->connect_callback = callback;
2338 return 0;
2339}
2340
2341unsigned varlink_server_connections_max(VarlinkServer *s) {
2342 struct rlimit rl;
2343
2344 /* If a server is specified, return the setting for that server, otherwise the default value */
2345 if (s)
2346 return s->connections_max;
2347
2348 assert_se(getrlimit(RLIMIT_NOFILE, &rl) >= 0);
2349
2350 /* Make sure we never use up more than ¾th of RLIMIT_NOFILE for IPC */
2351 if (VARLINK_DEFAULT_CONNECTIONS_MAX > rl.rlim_cur / 4 * 3)
2352 return rl.rlim_cur / 4 * 3;
2353
2354 return VARLINK_DEFAULT_CONNECTIONS_MAX;
2355}
2356
2357unsigned varlink_server_connections_per_uid_max(VarlinkServer *s) {
2358 unsigned m;
2359
2360 if (s)
2361 return s->connections_per_uid_max;
2362
2363 /* Make sure to never use up more than ¾th of available connections for a single user */
2364 m = varlink_server_connections_max(NULL);
2365 if (VARLINK_DEFAULT_CONNECTIONS_PER_UID_MAX > m)
2366 return m / 4 * 3;
2367
2368 return VARLINK_DEFAULT_CONNECTIONS_PER_UID_MAX;
2369}
2370
2371int varlink_server_set_connections_per_uid_max(VarlinkServer *s, unsigned m) {
2372 assert_return(s, -EINVAL);
2373 assert_return(m > 0, -EINVAL);
2374
2375 s->connections_per_uid_max = m;
2376 return 0;
2377}
2378
2379int varlink_server_set_connections_max(VarlinkServer *s, unsigned m) {
2380 assert_return(s, -EINVAL);
2381 assert_return(m > 0, -EINVAL);
2382
2383 s->connections_max = m;
2384 return 0;
2385}
2386
2387int varlink_server_set_description(VarlinkServer *s, const char *description) {
2388 assert_return(s, -EINVAL);
2389
2390 return free_and_strdup(&s->description, description);
2391}
Unnamed repository; edit this file 'description' to name the repository.