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networkd: rewrite condition to make it easier to understand
[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
8688c29b
YW		 249 /* Here use new0 as the below structured initializer is nested. */
250 v = new0(Varlink, 1);
d41bd96f
LP		 251 if (!v)
252 return -ENOMEM;
253
254 *v = (Varlink) {
255 .n_ref = 1,
256 .fd = -1,
257
258 .state = _VARLINK_STATE_INVALID,
259
260 .ucred.uid = UID_INVALID,
261 .ucred.gid = GID_INVALID,
262
263 .timestamp = USEC_INFINITY,
264 .timeout = VARLINK_DEFAULT_TIMEOUT_USEC
265 };
266
267 *ret = v;
268 return 0;
269}
270
271int varlink_connect_address(Varlink **ret, const char *address) {
272 _cleanup_(varlink_unrefp) Varlink *v = NULL;
273 union sockaddr_union sockaddr;
274 int r;
275
276 assert_return(ret, -EINVAL);
277 assert_return(address, -EINVAL);
278
279 r = sockaddr_un_set_path(&sockaddr.un, address);
280 if (r < 0)
281 return r;
282
283 r = varlink_new(&v);
284 if (r < 0)
285 return r;
286
287 v->fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
288 if (v->fd < 0)
289 return -errno;
290
291 if (connect(v->fd, &sockaddr.sa, SOCKADDR_UN_LEN(sockaddr.un)) < 0) {
292 if (!IN_SET(errno, EAGAIN, EINPROGRESS))
293 return -errno;
294
295 v->connecting = true; /* We are asynchronously connecting, i.e. the connect() is being
296 * processed in the background. As long as that's the case the socket
297 * is in a special state: it's there, we can poll it for EPOLLOUT, but
298 * if we attempt to write() to it before we see EPOLLOUT we'll get
299 * ENOTCONN (and not EAGAIN, like we would for a normal connected
300 * socket that isn't writable at the moment). Since ENOTCONN on write()
301 * hence can mean two different things (i.e. connection not complete
302 * yet vs. already disconnected again), we store as a boolean whether
303 * we are still in connect(). */
304 }
305
306 varlink_set_state(v, VARLINK_IDLE_CLIENT);
307
308 *ret = TAKE_PTR(v);
309 return r;
310}
311
312int varlink_connect_fd(Varlink **ret, int fd) {
313 Varlink *v;
314 int r;
315
316 assert_return(ret, -EINVAL);
317 assert_return(fd >= 0, -EBADF);
318
319 r = fd_nonblock(fd, true);
320 if (r < 0)
321 return r;
322
323 r = varlink_new(&v);
324 if (r < 0)
325 return r;
326
327 v->fd = fd;
328 varlink_set_state(v, VARLINK_IDLE_CLIENT);
329
330 /* Note that if this function is called we assume the passed socket (if it is one) is already
331 * properly connected, i.e. any asynchronous connect() done on it already completed. Because of that
332 * we'll not set the 'connecting' boolean here, i.e. we don't need to avoid write()ing to the socket
333 * until the connection is fully set up. Behaviour here is hence a bit different from
334 * varlink_connect_address() above, as there we do handle asynchronous connections ourselves and
335 * avoid doing write() on it before we saw EPOLLOUT for the first time. */
336
337 *ret = v;
338 return 0;
339}
340
341static void varlink_detach_event_sources(Varlink *v) {
342 assert(v);
343
1d3fe304 344 v->io_event_source = sd_event_source_disable_unref(v->io_event_source);
d41bd96f 345
1d3fe304 346 v->time_event_source = sd_event_source_disable_unref(v->time_event_source);
d41bd96f 347
1d3fe304 348 v->quit_event_source = sd_event_source_disable_unref(v->quit_event_source);
d41bd96f 349
1d3fe304 350 v->defer_event_source = sd_event_source_disable_unref(v->defer_event_source);
d41bd96f
LP		 351}
352
353static void varlink_clear(Varlink *v) {
354 assert(v);
355
356 varlink_detach_event_sources(v);
357
358 v->fd = safe_close(v->fd);
359
360 v->input_buffer = mfree(v->input_buffer);
361 v->output_buffer = mfree(v->output_buffer);
362
363 v->current = json_variant_unref(v->current);
364 v->reply = json_variant_unref(v->reply);
365
366 v->event = sd_event_unref(v->event);
367}
368
369static Varlink* varlink_destroy(Varlink *v) {
370 if (!v)
371 return NULL;
372
373 /* If this is called the server object must already been unreffed here. Why that? because when we
374 * linked up the varlink connection with the server object we took one ref in each direction */
375 assert(!v->server);
376
377 varlink_clear(v);
378
379 free(v->description);
380 return mfree(v);
381}
382
383DEFINE_TRIVIAL_REF_UNREF_FUNC(Varlink, varlink, varlink_destroy);
384
385static int varlink_test_disconnect(Varlink *v) {
386 assert(v);
387
388 /* Tests whether we the the connection has been terminated. We are careful to not stop processing it
389 * prematurely, since we want to handle half-open connections as well as possible and want to flush
390 * out and read data before we close down if we can. */
391
392 /* Already disconnected? */
393 if (!VARLINK_STATE_IS_ALIVE(v->state))
394 return 0;
395
396 /* Wait until connection setup is complete, i.e. until asynchronous connect() completes */
397 if (v->connecting)
398 return 0;
399
400 /* Still something to write and we can write? Stay around */
401 if (v->output_buffer_size > 0 && !v->write_disconnected)
402 return 0;
403
404 /* Both sides gone already? Then there's no need to stick around */
405 if (v->read_disconnected && v->write_disconnected)
406 goto disconnect;
407
408 /* If we are waiting for incoming data but the read side is shut down, disconnect. */
409 if (IN_SET(v->state, VARLINK_AWAITING_REPLY, VARLINK_CALLING, VARLINK_IDLE_SERVER) && v->read_disconnected)
410 goto disconnect;
411
412 /* Similar, if are a client that hasn't written anything yet but the write side is dead, also
413 * disconnect. We also explicitly check for POLLHUP here since we likely won't notice the write side
414 * being down if we never wrote anything. */
415 if (IN_SET(v->state, VARLINK_IDLE_CLIENT) && (v->write_disconnected || v->got_pollhup))
416 goto disconnect;
417
418 return 0;
419
420disconnect:
421 varlink_set_state(v, VARLINK_PENDING_DISCONNECT);
422 return 1;
423}
424
425static int varlink_write(Varlink *v) {
426 ssize_t n;
427
428 assert(v);
429
430 if (!VARLINK_STATE_IS_ALIVE(v->state))
431 return 0;
432 if (v->connecting) /* Writing while we are still wait for a non-blocking connect() to complete will
433 * result in ENOTCONN, hence exit early here */
434 return 0;
435 if (v->output_buffer_size == 0)
436 return 0;
437 if (v->write_disconnected)
438 return 0;
439
440 assert(v->fd >= 0);
441
442 /* We generally prefer recv()/send() (mostly because of MSG_NOSIGNAL) but also want to be compatible
443 * with non-socket IO, hence fall back automatically */
444 if (!v->prefer_read_write) {
445 n = send(v->fd, v->output_buffer + v->output_buffer_index, v->output_buffer_size, MSG_DONTWAIT|MSG_NOSIGNAL);
446 if (n < 0 && errno == ENOTSOCK)
447 v->prefer_read_write = true;
448 }
449 if (v->prefer_read_write)
450 n = write(v->fd, v->output_buffer + v->output_buffer_index, v->output_buffer_size);
451 if (n < 0) {
452 if (errno == EAGAIN)
453 return 0;
454
455 if (ERRNO_IS_DISCONNECT(errno)) {
456 /* If we get informed about a disconnect on write, then let's remember that, but not
457 * act on it just yet. Let's wait for read() to report the issue first. */
458 v->write_disconnected = true;
459 return 1;
460 }
461
462 return -errno;
463 }
464
465 v->output_buffer_size -= n;
466
467 if (v->output_buffer_size == 0)
468 v->output_buffer_index = 0;
469 else
470 v->output_buffer_index += n;
471
472 v->timestamp = now(CLOCK_MONOTONIC);
473 return 1;
474}
475
476static int varlink_read(Varlink *v) {
477 size_t rs;
478 ssize_t n;
479
480 assert(v);
481
482 if (!IN_SET(v->state, VARLINK_AWAITING_REPLY, VARLINK_CALLING, VARLINK_IDLE_SERVER))
483 return 0;
484 if (v->connecting) /* read() on a socket while we are in connect() will fail with EINVAL, hence exit early here */
485 return 0;
486 if (v->current)
487 return 0;
488 if (v->input_buffer_unscanned > 0)
489 return 0;
490 if (v->read_disconnected)
491 return 0;
492
493 if (v->input_buffer_size >= VARLINK_BUFFER_MAX)
494 return -ENOBUFS;
495
496 assert(v->fd >= 0);
497
498 if (v->input_buffer_allocated <= v->input_buffer_index + v->input_buffer_size) {
499 size_t add;
500
501 add = MIN(VARLINK_BUFFER_MAX - v->input_buffer_size, VARLINK_READ_SIZE);
502
503 if (v->input_buffer_index == 0) {
504
505 if (!GREEDY_REALLOC(v->input_buffer, v->input_buffer_allocated, v->input_buffer_size + add))
506 return -ENOMEM;
507
508 } else {
509 char *b;
510
511 b = new(char, v->input_buffer_size + add);
512 if (!b)
513 return -ENOMEM;
514
515 memcpy(b, v->input_buffer + v->input_buffer_index, v->input_buffer_size);
516
517 free_and_replace(v->input_buffer, b);
518
519 v->input_buffer_allocated = v->input_buffer_size + add;
520 v->input_buffer_index = 0;
521 }
522 }
523
524 rs = v->input_buffer_allocated - (v->input_buffer_index + v->input_buffer_size);
525
526 if (!v->prefer_read_write) {
527 n = recv(v->fd, v->input_buffer + v->input_buffer_index + v->input_buffer_size, rs, MSG_DONTWAIT);
528 if (n < 0 && errno == ENOTSOCK)
529 v->prefer_read_write = true;
530 }
531 if (v->prefer_read_write)
532 n = read(v->fd, v->input_buffer + v->input_buffer_index + v->input_buffer_size, rs);
533 if (n < 0) {
534 if (errno == EAGAIN)
535 return 0;
536
537 if (ERRNO_IS_DISCONNECT(errno)) {
538 v->read_disconnected = true;
539 return 1;
540 }
541
542 return -errno;
543 }
544 if (n == 0) { /* EOF */
545 v->read_disconnected = true;
546 return 1;
547 }
548
549 v->input_buffer_size += n;
550 v->input_buffer_unscanned += n;
551
552 return 1;
553}
554
555static int varlink_parse_message(Varlink *v) {
556 const char *e, *begin;
557 size_t sz;
558 int r;
559
560 assert(v);
561
562 if (v->current)
563 return 0;
564 if (v->input_buffer_unscanned <= 0)
565 return 0;
566
567 assert(v->input_buffer_unscanned <= v->input_buffer_size);
568 assert(v->input_buffer_index + v->input_buffer_size <= v->input_buffer_allocated);
569
570 begin = v->input_buffer + v->input_buffer_index;
571
572 e = memchr(begin + v->input_buffer_size - v->input_buffer_unscanned, 0, v->input_buffer_unscanned);
573 if (!e) {
574 v->input_buffer_unscanned = 0;
575 return 0;
576 }
577
578 sz = e - begin + 1;
579
580 varlink_log(v, "New incoming message: %s", begin);
581
582 r = json_parse(begin, &v->current, NULL, NULL);
583 if (r < 0)
584 return r;
585
586 v->input_buffer_size -= sz;
587
588 if (v->input_buffer_size == 0)
589 v->input_buffer_index = 0;
590 else
591 v->input_buffer_index += sz;
592
593 v->input_buffer_unscanned = v->input_buffer_size;
594 return 1;
595}
596
597static int varlink_test_timeout(Varlink *v) {
598 assert(v);
599
600 if (!IN_SET(v->state, VARLINK_AWAITING_REPLY, VARLINK_CALLING))
601 return 0;
602 if (v->timeout == USEC_INFINITY)
603 return 0;
604
605 if (now(CLOCK_MONOTONIC) < usec_add(v->timestamp, v->timeout))
606 return 0;
607
608 varlink_set_state(v, VARLINK_PENDING_TIMEOUT);
609
610 return 1;
611}
612
613static int varlink_dispatch_local_error(Varlink *v, const char *error) {
614 int r;
615
616 assert(v);
617 assert(error);
618
619 if (!v->reply_callback)
620 return 0;
621
622 r = v->reply_callback(v, NULL, error, VARLINK_REPLY_ERROR|VARLINK_REPLY_LOCAL, v->userdata);
623 if (r < 0)
624 log_debug_errno(r, "Reply callback returned error, ignoring: %m");
625
626 return 1;
627}
628
629static int varlink_dispatch_timeout(Varlink *v) {
630 assert(v);
631
632 if (v->state != VARLINK_PENDING_TIMEOUT)
633 return 0;
634
635 varlink_set_state(v, VARLINK_PROCESSING_TIMEOUT);
636 varlink_dispatch_local_error(v, VARLINK_ERROR_TIMEOUT);
637 varlink_close(v);
638
639 return 1;
640}
641
642static int varlink_dispatch_disconnect(Varlink *v) {
643 assert(v);
644
645 if (v->state != VARLINK_PENDING_DISCONNECT)
646 return 0;
647
648 varlink_set_state(v, VARLINK_PROCESSING_DISCONNECT);
649 varlink_dispatch_local_error(v, VARLINK_ERROR_DISCONNECTED);
650 varlink_close(v);
651
652 return 1;
653}
654
655static int varlink_sanitize_parameters(JsonVariant **v) {
656 assert(v);
657
658 /* Varlink always wants a parameters list, hence make one if the caller doesn't want any */
659 if (!*v)
660 return json_variant_new_object(v, NULL, 0);
661 else if (!json_variant_is_object(*v))
662 return -EINVAL;
663
664 return 0;
665}
666
667static int varlink_dispatch_reply(Varlink *v) {
668 _cleanup_(json_variant_unrefp) JsonVariant *parameters = NULL;
669 VarlinkReplyFlags flags = 0;
670 const char *error = NULL;
671 JsonVariant *e;
672 const char *k;
673 int r;
674
675 assert(v);
676
677 if (!IN_SET(v->state, VARLINK_AWAITING_REPLY, VARLINK_CALLING))
678 return 0;
679 if (!v->current)
680 return 0;
681
682 assert(v->n_pending > 0);
683
684 if (!json_variant_is_object(v->current))
685 goto invalid;
686
687 JSON_VARIANT_OBJECT_FOREACH(k, e, v->current) {
688
689 if (streq(k, "error")) {
690 if (error)
691 goto invalid;
692 if (!json_variant_is_string(e))
693 goto invalid;
694
695 error = json_variant_string(e);
696 flags |= VARLINK_REPLY_ERROR;
697
698 } else if (streq(k, "parameters")) {
699 if (parameters)
700 goto invalid;
701 if (!json_variant_is_object(e))
702 goto invalid;
703
704 parameters = json_variant_ref(e);
705
706 } else if (streq(k, "continues")) {
707 if (FLAGS_SET(flags, VARLINK_REPLY_CONTINUES))
708 goto invalid;
709
710 if (!json_variant_is_boolean(e))
711 goto invalid;
712
713 if (json_variant_boolean(e))
714 flags |= VARLINK_REPLY_CONTINUES;
715 } else
716 goto invalid;
717 }
718
719 if (error && FLAGS_SET(flags, VARLINK_REPLY_CONTINUES))
720 goto invalid;
721
722 r = varlink_sanitize_parameters(&parameters);
723 if (r < 0)
724 goto invalid;
725
726 if (v->state == VARLINK_AWAITING_REPLY) {
727 varlink_set_state(v, VARLINK_PROCESSING_REPLY);
728
729 if (v->reply_callback) {
730 r = v->reply_callback(v, parameters, error, flags, v->userdata);
731 if (r < 0)
732 log_debug_errno(r, "Reply callback returned error, ignoring: %m");
733 }
734
735 v->current = json_variant_unref(v->current);
736
737 if (v->state == VARLINK_PROCESSING_REPLY) {
738 assert(v->n_pending > 0);
739 v->n_pending--;
740
741 varlink_set_state(v, v->n_pending == 0 ? VARLINK_IDLE_CLIENT : VARLINK_AWAITING_REPLY);
742 }
743 } else {
744 assert(v->state == VARLINK_CALLING);
745
746 if (FLAGS_SET(flags, VARLINK_REPLY_CONTINUES))
747 goto invalid;
748
749 varlink_set_state(v, VARLINK_CALLED);
750 }
751
752 return 1;
753
754invalid:
755 varlink_set_state(v, VARLINK_PROCESSING_FAILURE);
756 varlink_dispatch_local_error(v, VARLINK_ERROR_PROTOCOL);
757 varlink_close(v);
758
759 return 1;
760}
761
762static int varlink_dispatch_method(Varlink *v) {
763 _cleanup_(json_variant_unrefp) JsonVariant *parameters = NULL;
764 VarlinkMethodFlags flags = 0;
765 const char *method = NULL, *error;
766 JsonVariant *e;
767 VarlinkMethod callback;
768 const char *k;
769 int r;
770
771 assert(v);
772
773 if (v->state != VARLINK_IDLE_SERVER)
774 return 0;
775 if (!v->current)
776 return 0;
777
778 if (!json_variant_is_object(v->current))
779 goto invalid;
780
781 JSON_VARIANT_OBJECT_FOREACH(k, e, v->current) {
782
783 if (streq(k, "method")) {
784 if (method)
785 goto invalid;
786 if (!json_variant_is_string(e))
787 goto invalid;
788
789 method = json_variant_string(e);
790
791 } else if (streq(k, "parameters")) {
792 if (parameters)
793 goto invalid;
794 if (!json_variant_is_object(e))
795 goto invalid;
796
797 parameters = json_variant_ref(e);
798
799 } else if (streq(k, "oneway")) {
800
801 if ((flags & (VARLINK_METHOD_ONEWAY|VARLINK_METHOD_MORE)) != 0)
802 goto invalid;
803
804 if (!json_variant_is_boolean(e))
805 goto invalid;
806
807 if (json_variant_boolean(e))
808 flags |= VARLINK_METHOD_ONEWAY;
809
810 } else if (streq(k, "more")) {
811
812 if ((flags & (VARLINK_METHOD_ONEWAY|VARLINK_METHOD_MORE)) != 0)
813 goto invalid;
814
815 if (!json_variant_is_boolean(e))
816 goto invalid;
817
818 if (json_variant_boolean(e))
819 flags |= VARLINK_METHOD_MORE;
820
821 } else
822 goto invalid;
823 }
824
825 if (!method)
826 goto invalid;
827
828 r = varlink_sanitize_parameters(&parameters);
829 if (r < 0)
830 goto fail;
831
832 varlink_set_state(v, (flags & VARLINK_METHOD_MORE) ? VARLINK_PROCESSING_METHOD_MORE :
833 (flags & VARLINK_METHOD_ONEWAY) ? VARLINK_PROCESSING_METHOD_ONEWAY :
834 VARLINK_PROCESSING_METHOD);
835
836 assert(v->server);
837
838 if (STR_IN_SET(method, "org.varlink.service.GetInfo", "org.varlink.service.GetInterface")) {
839 /* For now, we don't implement a single of varlink's own methods */
840 callback = NULL;
841 error = VARLINK_ERROR_METHOD_NOT_IMPLEMENTED;
842 } else if (startswith(method, "org.varlink.service.")) {
843 callback = NULL;
844 error = VARLINK_ERROR_METHOD_NOT_FOUND;
845 } else {
846 callback = hashmap_get(v->server->methods, method);
847 error = VARLINK_ERROR_METHOD_NOT_FOUND;
848 }
849
850 if (callback) {
851 r = callback(v, parameters, flags, v->userdata);
852 if (r < 0) {
853 log_debug_errno(r, "Callback for %s returned error: %m", method);
854
855 /* We got an error back from the callback. Propagate it to the client if the method call remains unanswered. */
856 if (!FLAGS_SET(flags, VARLINK_METHOD_ONEWAY)) {
857 r = varlink_errorb(v, VARLINK_ERROR_SYSTEM, JSON_BUILD_OBJECT(JSON_BUILD_PAIR("errno", JSON_BUILD_INTEGER(-r))));
858 if (r < 0)
859 return r;
860 }
861 }
862 } else if (!FLAGS_SET(flags, VARLINK_METHOD_ONEWAY)) {
863 assert(error);
864
865 r = varlink_errorb(v, error, JSON_BUILD_OBJECT(JSON_BUILD_PAIR("method", JSON_BUILD_STRING(method))));
866 if (r < 0)
867 return r;
868 }
869
870 switch (v->state) {
871
872 case VARLINK_PROCESSED_METHOD: /* Method call is fully processed */
873 case VARLINK_PROCESSING_METHOD_ONEWAY: /* ditto */
874 v->current = json_variant_unref(v->current);
875 varlink_set_state(v, VARLINK_IDLE_SERVER);
876 break;
877
878 case VARLINK_PROCESSING_METHOD: /* Method call wasn't replied to, will be replied to later */
879 varlink_set_state(v, VARLINK_PENDING_METHOD);
880 break;
881
882 case VARLINK_PROCESSED_METHOD_MORE: /* One reply for a "more" message was sent, more to come */
883 case VARLINK_PROCESSING_METHOD_MORE: /* No reply for a "more" message was sent, more to come */
884 varlink_set_state(v, VARLINK_PENDING_METHOD_MORE);
885 break;
886
887 default:
888 assert_not_reached("Unexpected state");
889
890 }
891
892 return r;
893
894invalid:
895 r = -EINVAL;
896
897fail:
898 varlink_set_state(v, VARLINK_PROCESSING_FAILURE);
899 varlink_dispatch_local_error(v, VARLINK_ERROR_PROTOCOL);
900 varlink_close(v);
901
902 return r;
903}
904
905int varlink_process(Varlink *v) {
906 int r;
907
908 assert_return(v, -EINVAL);
909
910 if (v->state == VARLINK_DISCONNECTED)
911 return -ENOTCONN;
912
913 varlink_ref(v);
914
915 r = varlink_write(v);
916 if (r != 0)
917 goto finish;
918
919 r = varlink_dispatch_reply(v);
920 if (r != 0)
921 goto finish;
922
923 r = varlink_dispatch_method(v);
924 if (r != 0)
925 goto finish;
926
927 r = varlink_parse_message(v);
928 if (r != 0)
929 goto finish;
930
931 r = varlink_read(v);
932 if (r != 0)
933 goto finish;
934
935 r = varlink_test_disconnect(v);
936 if (r != 0)
937 goto finish;
938
939 r = varlink_dispatch_disconnect(v);
940 if (r != 0)
941 goto finish;
942
943 r = varlink_test_timeout(v);
944 if (r != 0)
945 goto finish;
946
947 r = varlink_dispatch_timeout(v);
948 if (r != 0)
949 goto finish;
950
951finish:
952 if (r >= 0 && v->defer_event_source) {
953 int q;
954
955 /* If we did some processing, make sure we are called again soon */
956 q = sd_event_source_set_enabled(v->defer_event_source, r > 0 ? SD_EVENT_ON : SD_EVENT_OFF);
957 if (q < 0)
958 r = q;
959 }
960
961 if (r < 0) {
962 if (VARLINK_STATE_IS_ALIVE(v->state))
963 /* Initiate disconnection */
964 varlink_set_state(v, VARLINK_PENDING_DISCONNECT);
965 else
966 /* We failed while disconnecting, in that case close right away */
967 varlink_close(v);
968 }
969
970 varlink_unref(v);
971 return r;
972}
973
974static void handle_revents(Varlink *v, int revents) {
975 assert(v);
976
977 if (v->connecting) {
978 /* If we have seen POLLOUT or POLLHUP on a socket we are asynchronously waiting a connect()
979 * to complete on, we know we are ready. We don't read the connection error here though,
980 * we'll get the error on the next read() or write(). */
981 if ((revents & (POLLOUT|POLLHUP)) == 0)
982 return;
983
984 varlink_log(v, "Anynchronous connection completed.");
985 v->connecting = false;
986 } else {
987 /* Note that we don't care much about POLLIN/POLLOUT here, we'll just try reading and writing
988 * what we can. However, we do care about POLLHUP to detect connection termination even if we
989 * momentarily don't want to read nor write anything. */
990
991 if (!FLAGS_SET(revents, POLLHUP))
992 return;
993
994 varlink_log(v, "Got POLLHUP from socket.");
995 v->got_pollhup = true;
996 }
997}
998
999int varlink_wait(Varlink *v, usec_t timeout) {
1000 struct timespec ts;
1001 struct pollfd pfd;
1002 int r, fd, events;
1003 usec_t t;
1004
1005 assert_return(v, -EINVAL);
1006 assert_return(!v->server, -ENOTTY);
1007
1008 if (v->state == VARLINK_DISCONNECTED)
1009 return -ENOTCONN;
1010
1011 r = varlink_get_timeout(v, &t);
1012 if (r < 0)
1013 return r;
1014 if (t != USEC_INFINITY) {
1015 usec_t n;
1016
1017 n = now(CLOCK_MONOTONIC);
1018 if (t < n)
1019 t = 0;
1020 else
1021 t = usec_sub_unsigned(t, n);
1022 }
1023
1024 if (timeout != USEC_INFINITY &&
1025 (t == USEC_INFINITY || timeout < t))
1026 t = timeout;
1027
1028 fd = varlink_get_fd(v);
1029 if (fd < 0)
1030 return fd;
1031
1032 events = varlink_get_events(v);
1033 if (events < 0)
1034 return events;
1035
1036 pfd = (struct pollfd) {
1037 .fd = fd,
1038 .events = events,
1039 };
1040
1041 r = ppoll(&pfd, 1,
1042 t == USEC_INFINITY ? NULL : timespec_store(&ts, t),
1043 NULL);
1044 if (r < 0)
1045 return -errno;
1046
1047 handle_revents(v, pfd.revents);
1048
1049 return r > 0 ? 1 : 0;
1050}
1051
1052int varlink_get_fd(Varlink *v) {
1053
1054 assert_return(v, -EINVAL);
1055
1056 if (v->state == VARLINK_DISCONNECTED)
1057 return -ENOTCONN;
1058 if (v->fd < 0)
1059 return -EBADF;
1060
1061 return v->fd;
1062}
1063
1064int varlink_get_events(Varlink *v) {
1065 int ret = 0;
1066
1067 assert_return(v, -EINVAL);
1068
1069 if (v->state == VARLINK_DISCONNECTED)
1070 return -ENOTCONN;
1071
1072 if (v->connecting) /* When processing an asynchronous connect(), we only wait for EPOLLOUT, which
1073 * tells us that the connection is now complete. Before that we should neither
1074 * write() or read() from the fd. */
1075 return EPOLLOUT;
1076
1077 if (!v->read_disconnected &&
1078 IN_SET(v->state, VARLINK_AWAITING_REPLY, VARLINK_CALLING, VARLINK_IDLE_SERVER) &&
1079 !v->current &&
1080 v->input_buffer_unscanned <= 0)
1081 ret |= EPOLLIN;
1082
1083 if (!v->write_disconnected &&
1084 v->output_buffer_size > 0)
1085 ret |= EPOLLOUT;
1086
1087 return ret;
1088}
1089
1090int varlink_get_timeout(Varlink *v, usec_t *ret) {
1091 assert_return(v, -EINVAL);
1092
1093 if (v->state == VARLINK_DISCONNECTED)
1094 return -ENOTCONN;
1095
1096 if (IN_SET(v->state, VARLINK_AWAITING_REPLY, VARLINK_CALLING) &&
1097 v->timeout != USEC_INFINITY) {
1098 if (ret)
1099 *ret = usec_add(v->timestamp, v->timeout);
1100 return 1;
1101 } else {
1102 if (ret)
1103 *ret = USEC_INFINITY;
1104 return 0;
1105 }
1106}
1107
1108int varlink_flush(Varlink *v) {
1109 int ret = 0, r;
1110
1111 assert_return(v, -EINVAL);
1112
1113 if (v->state == VARLINK_DISCONNECTED)
1114 return -ENOTCONN;
1115
1116 for (;;) {
1117 struct pollfd pfd;
1118
1119 if (v->output_buffer_size == 0)
1120 break;
1121 if (v->write_disconnected)
1122 return -ECONNRESET;
1123
1124 r = varlink_write(v);
1125 if (r < 0)
1126 return r;
1127 if (r > 0) {
1128 ret = 1;
1129 continue;
1130 }
1131
1132 pfd = (struct pollfd) {
1133 .fd = v->fd,
1134 .events = POLLOUT,
1135 };
1136
1137 if (poll(&pfd, 1, -1) < 0)
1138 return -errno;
1139
1140 handle_revents(v, pfd.revents);
1141 }
1142
1143 return ret;
1144}
1145
1146static void varlink_detach_server(Varlink *v) {
1147 assert(v);
1148
1149 if (!v->server)
1150 return;
1151
1152 if (v->server->by_uid &&
1153 v->ucred_acquired &&
1154 uid_is_valid(v->ucred.uid)) {
1155 unsigned c;
1156
1157 c = PTR_TO_UINT(hashmap_get(v->server->by_uid, UID_TO_PTR(v->ucred.uid)));
1158 assert(c > 0);
1159
1160 if (c == 1)
1161 (void) hashmap_remove(v->server->by_uid, UID_TO_PTR(v->ucred.uid));
1162 else
1163 (void) hashmap_replace(v->server->by_uid, UID_TO_PTR(v->ucred.uid), UINT_TO_PTR(c - 1));
1164 }
1165
1166 assert(v->server->n_connections > 0);
1167 v->server->n_connections--;
1168
1169 /* If this is a connection associated to a server, then let's disconnect the server and the
1170 * connection from each other. This drops the dangling reference that connect_callback() set up. */
1171 v->server = varlink_server_unref(v->server);
1172 varlink_unref(v);
1173}
1174
1175int varlink_close(Varlink *v) {
1176
1177 assert_return(v, -EINVAL);
1178
1179 if (v->state == VARLINK_DISCONNECTED)
1180 return 0;
1181
1182 varlink_set_state(v, VARLINK_DISCONNECTED);
1183
1184 /* Let's take a reference first, since varlink_detach_server() might drop the final (dangling) ref
1185 * which would destroy us before we can call varlink_clear() */
1186 varlink_ref(v);
1187 varlink_detach_server(v);
1188 varlink_clear(v);
1189 varlink_unref(v);
1190
1191 return 1;
1192}
1193
1194Varlink* varlink_flush_close_unref(Varlink *v) {
1195
1196 if (!v)
1197 return NULL;
1198
1199 (void) varlink_flush(v);
1200 (void) varlink_close(v);
1201
1202 return varlink_unref(v);
1203}
1204
1205static int varlink_enqueue_json(Varlink *v, JsonVariant *m) {
1206 _cleanup_free_ char *text = NULL;
1207 int r;
1208
1209 assert(v);
1210 assert(m);
1211
1212 r = json_variant_format(m, 0, &text);
1213 if (r < 0)
1214 return r;
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;
2307 int r;
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)
2324 return r;
2325 }
2326
2327 return 0;
2328}
2329
2330int varlink_server_bind_connect(VarlinkServer *s, VarlinkConnect callback) {
2331 assert_return(s, -EINVAL);
2332
2333 if (callback && s->connect_callback && callback != s->connect_callback)
2334 return -EBUSY;
2335
2336 s->connect_callback = callback;
2337 return 0;
2338}
2339
2340unsigned varlink_server_connections_max(VarlinkServer *s) {
2341 struct rlimit rl;
2342
2343 /* If a server is specified, return the setting for that server, otherwise the default value */
2344 if (s)
2345 return s->connections_max;
2346
2347 assert_se(getrlimit(RLIMIT_NOFILE, &rl) >= 0);
2348
2349 /* Make sure we never use up more than ¾th of RLIMIT_NOFILE for IPC */
2350 if (VARLINK_DEFAULT_CONNECTIONS_MAX > rl.rlim_cur / 4 * 3)
2351 return rl.rlim_cur / 4 * 3;
2352
2353 return VARLINK_DEFAULT_CONNECTIONS_MAX;
2354}
2355
2356unsigned varlink_server_connections_per_uid_max(VarlinkServer *s) {
2357 unsigned m;
2358
2359 if (s)
2360 return s->connections_per_uid_max;
2361
2362 /* Make sure to never use up more than ¾th of available connections for a single user */
2363 m = varlink_server_connections_max(NULL);
2364 if (VARLINK_DEFAULT_CONNECTIONS_PER_UID_MAX > m)
2365 return m / 4 * 3;
2366
2367 return VARLINK_DEFAULT_CONNECTIONS_PER_UID_MAX;
2368}
2369
2370int varlink_server_set_connections_per_uid_max(VarlinkServer *s, unsigned m) {
2371 assert_return(s, -EINVAL);
2372 assert_return(m > 0, -EINVAL);
2373
2374 s->connections_per_uid_max = m;
2375 return 0;
2376}
2377
2378int varlink_server_set_connections_max(VarlinkServer *s, unsigned m) {
2379 assert_return(s, -EINVAL);
2380 assert_return(m > 0, -EINVAL);
2381
2382 s->connections_max = m;
2383 return 0;
2384}
2385
2386int varlink_server_set_description(VarlinkServer *s, const char *description) {
2387 assert_return(s, -EINVAL);
2388
2389 return free_and_strdup(&s->description, description);
2390}
Unnamed repository; edit this file 'description' to name the repository.