]>
Commit | Line | Data |
---|---|---|
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" | |
0f2d351f | 9 | #include "io-util.h" |
d41bd96f LP |
10 | #include "list.h" |
11 | #include "process-util.h" | |
12 | #include "set.h" | |
13 | #include "socket-util.h" | |
14 | #include "string-table.h" | |
15 | #include "string-util.h" | |
16 | #include "strv.h" | |
17 | #include "time-util.h" | |
18 | #include "umask-util.h" | |
19 | #include "user-util.h" | |
20 | #include "varlink.h" | |
21 | ||
22 | #define VARLINK_DEFAULT_CONNECTIONS_MAX 4096U | |
23 | #define VARLINK_DEFAULT_CONNECTIONS_PER_UID_MAX 1024U | |
24 | ||
25 | #define VARLINK_DEFAULT_TIMEOUT_USEC (45U*USEC_PER_SEC) | |
26 | #define VARLINK_BUFFER_MAX (16U*1024U*1024U) | |
27 | #define VARLINK_READ_SIZE (64U*1024U) | |
28 | ||
29 | typedef enum VarlinkState { | |
30 | /* Client side states */ | |
31 | VARLINK_IDLE_CLIENT, | |
32 | VARLINK_AWAITING_REPLY, | |
45a6c965 | 33 | VARLINK_AWAITING_REPLY_MORE, |
d41bd96f LP |
34 | VARLINK_CALLING, |
35 | VARLINK_CALLED, | |
36 | VARLINK_PROCESSING_REPLY, | |
37 | ||
38 | /* Server side states */ | |
39 | VARLINK_IDLE_SERVER, | |
40 | VARLINK_PROCESSING_METHOD, | |
41 | VARLINK_PROCESSING_METHOD_MORE, | |
42 | VARLINK_PROCESSING_METHOD_ONEWAY, | |
43 | VARLINK_PROCESSED_METHOD, | |
d41bd96f LP |
44 | VARLINK_PENDING_METHOD, |
45 | VARLINK_PENDING_METHOD_MORE, | |
46 | ||
47 | /* Common states (only during shutdown) */ | |
48 | VARLINK_PENDING_DISCONNECT, | |
49 | VARLINK_PENDING_TIMEOUT, | |
50 | VARLINK_PROCESSING_DISCONNECT, | |
51 | VARLINK_PROCESSING_TIMEOUT, | |
52 | VARLINK_PROCESSING_FAILURE, | |
53 | VARLINK_DISCONNECTED, | |
54 | ||
55 | _VARLINK_STATE_MAX, | |
56 | _VARLINK_STATE_INVALID = -1 | |
57 | } VarlinkState; | |
58 | ||
59 | /* Tests whether we are not yet disconnected. Note that this is true during all states where the connection | |
60 | * is still good for something, and false only when it's dead for good. This means: when we are | |
61 | * asynchronously connecting to a peer and the connect() is still pending, then this will return 'true', as | |
62 | * the connection is still good, and we are likely to be able to properly operate on it soon. */ | |
63 | #define VARLINK_STATE_IS_ALIVE(state) \ | |
64 | IN_SET(state, \ | |
65 | VARLINK_IDLE_CLIENT, \ | |
66 | VARLINK_AWAITING_REPLY, \ | |
45a6c965 | 67 | VARLINK_AWAITING_REPLY_MORE, \ |
d41bd96f LP |
68 | VARLINK_CALLING, \ |
69 | VARLINK_CALLED, \ | |
70 | VARLINK_PROCESSING_REPLY, \ | |
71 | VARLINK_IDLE_SERVER, \ | |
72 | VARLINK_PROCESSING_METHOD, \ | |
73 | VARLINK_PROCESSING_METHOD_MORE, \ | |
74 | VARLINK_PROCESSING_METHOD_ONEWAY, \ | |
75 | VARLINK_PROCESSED_METHOD, \ | |
d41bd96f LP |
76 | VARLINK_PENDING_METHOD, \ |
77 | VARLINK_PENDING_METHOD_MORE) | |
78 | ||
79 | struct Varlink { | |
80 | unsigned n_ref; | |
81 | ||
82 | VarlinkServer *server; | |
83 | ||
84 | VarlinkState state; | |
85 | bool connecting; /* This boolean indicates whether the socket fd we are operating on is currently | |
86 | * processing an asynchronous connect(). In that state we watch the socket for | |
87 | * EPOLLOUT, but we refrain from calling read() or write() on the socket as that | |
88 | * will trigger ENOTCONN. Note that this boolean is kept separate from the | |
89 | * VarlinkState above on purpose: while the connect() is still not complete we | |
90 | * already want to allow queuing of messages and similar. Thus it's nice to keep | |
91 | * these two state concepts separate: the VarlinkState encodes what our own view of | |
92 | * the connection is, i.e. whether we think it's a server, a client, and has | |
93 | * something queued already, while 'connecting' tells us a detail about the | |
94 | * transport used below, that should have no effect on how we otherwise accept and | |
95 | * process operations from the user. | |
96 | * | |
97 | * Or to say this differently: VARLINK_STATE_IS_ALIVE(state) tells you whether the | |
98 | * connection is good to use, even if it might not be fully connected | |
99 | * yet. connecting=true then informs you that actually we are still connecting, and | |
100 | * the connection is actually not established yet and thus any requests you enqueue | |
101 | * now will still work fine but will be queued only, not sent yet, but that | |
102 | * shouldn't stop you from using the connection, since eventually whatever you queue | |
103 | * *will* be sent. | |
104 | * | |
105 | * Or to say this even differently: 'state' is a high-level ("application layer" | |
106 | * high, if you so will) state, while 'conecting' is a low-level ("transport layer" | |
107 | * low, if you so will) state, and while they are not entirely unrelated and | |
108 | * sometimes propagate effects to each other they are only asynchronously connected | |
109 | * at most. */ | |
110 | unsigned n_pending; | |
111 | ||
112 | int fd; | |
113 | ||
114 | char *input_buffer; /* valid data starts at input_buffer_index, ends at input_buffer_index+input_buffer_size */ | |
115 | size_t input_buffer_allocated; | |
116 | size_t input_buffer_index; | |
117 | size_t input_buffer_size; | |
118 | size_t input_buffer_unscanned; | |
119 | ||
120 | char *output_buffer; /* valid data starts at output_buffer_index, ends at output_buffer_index+output_buffer_size */ | |
121 | size_t output_buffer_allocated; | |
122 | size_t output_buffer_index; | |
123 | size_t output_buffer_size; | |
124 | ||
125 | VarlinkReply reply_callback; | |
126 | ||
127 | JsonVariant *current; | |
128 | JsonVariant *reply; | |
129 | ||
130 | struct ucred ucred; | |
131 | bool ucred_acquired:1; | |
132 | ||
133 | bool write_disconnected:1; | |
134 | bool read_disconnected:1; | |
135 | bool prefer_read_write:1; | |
136 | bool got_pollhup:1; | |
137 | ||
138 | usec_t timestamp; | |
139 | usec_t timeout; | |
140 | ||
141 | void *userdata; | |
142 | char *description; | |
143 | ||
144 | sd_event *event; | |
145 | sd_event_source *io_event_source; | |
146 | sd_event_source *time_event_source; | |
147 | sd_event_source *quit_event_source; | |
148 | sd_event_source *defer_event_source; | |
149 | }; | |
150 | ||
151 | typedef struct VarlinkServerSocket VarlinkServerSocket; | |
152 | ||
153 | struct VarlinkServerSocket { | |
154 | VarlinkServer *server; | |
155 | ||
156 | int fd; | |
157 | char *address; | |
158 | ||
159 | sd_event_source *event_source; | |
160 | ||
161 | LIST_FIELDS(VarlinkServerSocket, sockets); | |
162 | }; | |
163 | ||
164 | struct VarlinkServer { | |
165 | unsigned n_ref; | |
166 | VarlinkServerFlags flags; | |
167 | ||
168 | LIST_HEAD(VarlinkServerSocket, sockets); | |
169 | ||
170 | Hashmap *methods; | |
171 | VarlinkConnect connect_callback; | |
6d4d6002 | 172 | VarlinkDisconnect disconnect_callback; |
d41bd96f LP |
173 | |
174 | sd_event *event; | |
175 | int64_t event_priority; | |
176 | ||
177 | unsigned n_connections; | |
178 | Hashmap *by_uid; | |
179 | ||
180 | void *userdata; | |
181 | char *description; | |
182 | ||
183 | unsigned connections_max; | |
184 | unsigned connections_per_uid_max; | |
185 | }; | |
186 | ||
187 | static const char* const varlink_state_table[_VARLINK_STATE_MAX] = { | |
188 | [VARLINK_IDLE_CLIENT] = "idle-client", | |
189 | [VARLINK_AWAITING_REPLY] = "awaiting-reply", | |
45a6c965 | 190 | [VARLINK_AWAITING_REPLY_MORE] = "awaiting-reply-more", |
d41bd96f LP |
191 | [VARLINK_CALLING] = "calling", |
192 | [VARLINK_CALLED] = "called", | |
193 | [VARLINK_PROCESSING_REPLY] = "processing-reply", | |
194 | [VARLINK_IDLE_SERVER] = "idle-server", | |
195 | [VARLINK_PROCESSING_METHOD] = "processing-method", | |
196 | [VARLINK_PROCESSING_METHOD_MORE] = "processing-method-more", | |
197 | [VARLINK_PROCESSING_METHOD_ONEWAY] = "processing-method-oneway", | |
198 | [VARLINK_PROCESSED_METHOD] = "processed-method", | |
d41bd96f LP |
199 | [VARLINK_PENDING_METHOD] = "pending-method", |
200 | [VARLINK_PENDING_METHOD_MORE] = "pending-method-more", | |
201 | [VARLINK_PENDING_DISCONNECT] = "pending-disconnect", | |
202 | [VARLINK_PENDING_TIMEOUT] = "pending-timeout", | |
203 | [VARLINK_PROCESSING_DISCONNECT] = "processing-disconnect", | |
204 | [VARLINK_PROCESSING_TIMEOUT] = "processing-timeout", | |
205 | [VARLINK_PROCESSING_FAILURE] = "processing-failure", | |
206 | [VARLINK_DISCONNECTED] = "disconnected", | |
207 | }; | |
208 | ||
209 | DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(varlink_state, VarlinkState); | |
210 | ||
211 | #define varlink_log_errno(v, error, fmt, ...) \ | |
212 | log_debug_errno(error, "%s: " fmt, varlink_description(v), ##__VA_ARGS__) | |
213 | ||
214 | #define varlink_log(v, fmt, ...) \ | |
215 | log_debug("%s: " fmt, varlink_description(v), ##__VA_ARGS__) | |
216 | ||
217 | #define varlink_server_log_errno(s, error, fmt, ...) \ | |
218 | log_debug_errno(error, "%s: " fmt, varlink_server_description(s), ##__VA_ARGS__) | |
219 | ||
220 | #define varlink_server_log(s, fmt, ...) \ | |
221 | log_debug("%s: " fmt, varlink_server_description(s), ##__VA_ARGS__) | |
222 | ||
223 | static inline const char *varlink_description(Varlink *v) { | |
224 | return strna(v ? v->description : NULL); | |
225 | } | |
226 | ||
227 | static inline const char *varlink_server_description(VarlinkServer *s) { | |
228 | return strna(s ? s->description : NULL); | |
229 | } | |
230 | ||
231 | static void varlink_set_state(Varlink *v, VarlinkState state) { | |
232 | assert(v); | |
77740b59 ZJS |
233 | assert(state >= 0 && state < _VARLINK_STATE_MAX); |
234 | ||
235 | if (v->state < 0) | |
236 | varlink_log(v, "varlink: setting state %s", | |
237 | varlink_state_to_string(state)); | |
238 | else | |
239 | varlink_log(v, "varlink: changing state %s → %s", | |
240 | varlink_state_to_string(v->state), | |
241 | varlink_state_to_string(state)); | |
d41bd96f LP |
242 | |
243 | v->state = state; | |
244 | } | |
245 | ||
246 | static int varlink_new(Varlink **ret) { | |
247 | Varlink *v; | |
248 | ||
249 | assert(ret); | |
250 | ||
a48481dc | 251 | v = new(Varlink, 1); |
d41bd96f LP |
252 | if (!v) |
253 | return -ENOMEM; | |
254 | ||
255 | *v = (Varlink) { | |
256 | .n_ref = 1, | |
257 | .fd = -1, | |
258 | ||
259 | .state = _VARLINK_STATE_INVALID, | |
260 | ||
261 | .ucred.uid = UID_INVALID, | |
262 | .ucred.gid = GID_INVALID, | |
263 | ||
264 | .timestamp = USEC_INFINITY, | |
265 | .timeout = VARLINK_DEFAULT_TIMEOUT_USEC | |
266 | }; | |
267 | ||
268 | *ret = v; | |
269 | return 0; | |
270 | } | |
271 | ||
272 | int varlink_connect_address(Varlink **ret, const char *address) { | |
273 | _cleanup_(varlink_unrefp) Varlink *v = NULL; | |
274 | union sockaddr_union sockaddr; | |
f36a9d59 | 275 | socklen_t sockaddr_len; |
d41bd96f LP |
276 | int r; |
277 | ||
278 | assert_return(ret, -EINVAL); | |
279 | assert_return(address, -EINVAL); | |
280 | ||
281 | r = sockaddr_un_set_path(&sockaddr.un, address); | |
282 | if (r < 0) | |
283 | return r; | |
f36a9d59 | 284 | sockaddr_len = r; |
d41bd96f LP |
285 | |
286 | r = varlink_new(&v); | |
287 | if (r < 0) | |
288 | return r; | |
289 | ||
290 | v->fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); | |
291 | if (v->fd < 0) | |
292 | return -errno; | |
293 | ||
a0c41de2 LP |
294 | v->fd = fd_move_above_stdio(v->fd); |
295 | ||
f36a9d59 | 296 | if (connect(v->fd, &sockaddr.sa, sockaddr_len) < 0) { |
d41bd96f LP |
297 | if (!IN_SET(errno, EAGAIN, EINPROGRESS)) |
298 | return -errno; | |
299 | ||
300 | v->connecting = true; /* We are asynchronously connecting, i.e. the connect() is being | |
301 | * processed in the background. As long as that's the case the socket | |
302 | * is in a special state: it's there, we can poll it for EPOLLOUT, but | |
303 | * if we attempt to write() to it before we see EPOLLOUT we'll get | |
304 | * ENOTCONN (and not EAGAIN, like we would for a normal connected | |
305 | * socket that isn't writable at the moment). Since ENOTCONN on write() | |
306 | * hence can mean two different things (i.e. connection not complete | |
307 | * yet vs. already disconnected again), we store as a boolean whether | |
308 | * we are still in connect(). */ | |
309 | } | |
310 | ||
311 | varlink_set_state(v, VARLINK_IDLE_CLIENT); | |
312 | ||
313 | *ret = TAKE_PTR(v); | |
314 | return r; | |
315 | } | |
316 | ||
317 | int varlink_connect_fd(Varlink **ret, int fd) { | |
318 | Varlink *v; | |
319 | int r; | |
320 | ||
321 | assert_return(ret, -EINVAL); | |
322 | assert_return(fd >= 0, -EBADF); | |
323 | ||
324 | r = fd_nonblock(fd, true); | |
325 | if (r < 0) | |
326 | return r; | |
327 | ||
328 | r = varlink_new(&v); | |
329 | if (r < 0) | |
330 | return r; | |
331 | ||
332 | v->fd = fd; | |
333 | varlink_set_state(v, VARLINK_IDLE_CLIENT); | |
334 | ||
335 | /* Note that if this function is called we assume the passed socket (if it is one) is already | |
336 | * properly connected, i.e. any asynchronous connect() done on it already completed. Because of that | |
337 | * we'll not set the 'connecting' boolean here, i.e. we don't need to avoid write()ing to the socket | |
338 | * until the connection is fully set up. Behaviour here is hence a bit different from | |
339 | * varlink_connect_address() above, as there we do handle asynchronous connections ourselves and | |
340 | * avoid doing write() on it before we saw EPOLLOUT for the first time. */ | |
341 | ||
342 | *ret = v; | |
343 | return 0; | |
344 | } | |
345 | ||
346 | static void varlink_detach_event_sources(Varlink *v) { | |
347 | assert(v); | |
348 | ||
1d3fe304 | 349 | v->io_event_source = sd_event_source_disable_unref(v->io_event_source); |
1d3fe304 | 350 | v->time_event_source = sd_event_source_disable_unref(v->time_event_source); |
1d3fe304 | 351 | v->quit_event_source = sd_event_source_disable_unref(v->quit_event_source); |
1d3fe304 | 352 | v->defer_event_source = sd_event_source_disable_unref(v->defer_event_source); |
d41bd96f LP |
353 | } |
354 | ||
355 | static void varlink_clear(Varlink *v) { | |
356 | assert(v); | |
357 | ||
358 | varlink_detach_event_sources(v); | |
359 | ||
360 | v->fd = safe_close(v->fd); | |
361 | ||
362 | v->input_buffer = mfree(v->input_buffer); | |
363 | v->output_buffer = mfree(v->output_buffer); | |
364 | ||
365 | v->current = json_variant_unref(v->current); | |
366 | v->reply = json_variant_unref(v->reply); | |
367 | ||
368 | v->event = sd_event_unref(v->event); | |
369 | } | |
370 | ||
371 | static Varlink* varlink_destroy(Varlink *v) { | |
372 | if (!v) | |
373 | return NULL; | |
374 | ||
375 | /* If this is called the server object must already been unreffed here. Why that? because when we | |
376 | * linked up the varlink connection with the server object we took one ref in each direction */ | |
377 | assert(!v->server); | |
378 | ||
379 | varlink_clear(v); | |
380 | ||
381 | free(v->description); | |
382 | return mfree(v); | |
383 | } | |
384 | ||
385 | DEFINE_TRIVIAL_REF_UNREF_FUNC(Varlink, varlink, varlink_destroy); | |
386 | ||
387 | static int varlink_test_disconnect(Varlink *v) { | |
388 | assert(v); | |
389 | ||
37b22b3b | 390 | /* Tests whether we the connection has been terminated. We are careful to not stop processing it |
d41bd96f LP |
391 | * prematurely, since we want to handle half-open connections as well as possible and want to flush |
392 | * out and read data before we close down if we can. */ | |
393 | ||
394 | /* Already disconnected? */ | |
395 | if (!VARLINK_STATE_IS_ALIVE(v->state)) | |
396 | return 0; | |
397 | ||
398 | /* Wait until connection setup is complete, i.e. until asynchronous connect() completes */ | |
399 | if (v->connecting) | |
400 | return 0; | |
401 | ||
402 | /* Still something to write and we can write? Stay around */ | |
403 | if (v->output_buffer_size > 0 && !v->write_disconnected) | |
404 | return 0; | |
405 | ||
406 | /* Both sides gone already? Then there's no need to stick around */ | |
407 | if (v->read_disconnected && v->write_disconnected) | |
408 | goto disconnect; | |
409 | ||
410 | /* If we are waiting for incoming data but the read side is shut down, disconnect. */ | |
45a6c965 | 411 | if (IN_SET(v->state, VARLINK_AWAITING_REPLY, VARLINK_AWAITING_REPLY_MORE, VARLINK_CALLING, VARLINK_IDLE_SERVER) && v->read_disconnected) |
d41bd96f LP |
412 | goto disconnect; |
413 | ||
414 | /* Similar, if are a client that hasn't written anything yet but the write side is dead, also | |
415 | * disconnect. We also explicitly check for POLLHUP here since we likely won't notice the write side | |
416 | * being down if we never wrote anything. */ | |
417 | if (IN_SET(v->state, VARLINK_IDLE_CLIENT) && (v->write_disconnected || v->got_pollhup)) | |
418 | goto disconnect; | |
419 | ||
420 | return 0; | |
421 | ||
422 | disconnect: | |
423 | varlink_set_state(v, VARLINK_PENDING_DISCONNECT); | |
424 | return 1; | |
425 | } | |
426 | ||
427 | static int varlink_write(Varlink *v) { | |
428 | ssize_t n; | |
429 | ||
430 | assert(v); | |
431 | ||
432 | if (!VARLINK_STATE_IS_ALIVE(v->state)) | |
433 | return 0; | |
434 | if (v->connecting) /* Writing while we are still wait for a non-blocking connect() to complete will | |
435 | * result in ENOTCONN, hence exit early here */ | |
436 | return 0; | |
437 | if (v->output_buffer_size == 0) | |
438 | return 0; | |
439 | if (v->write_disconnected) | |
440 | return 0; | |
441 | ||
442 | assert(v->fd >= 0); | |
443 | ||
444 | /* We generally prefer recv()/send() (mostly because of MSG_NOSIGNAL) but also want to be compatible | |
445 | * with non-socket IO, hence fall back automatically */ | |
446 | if (!v->prefer_read_write) { | |
447 | n = send(v->fd, v->output_buffer + v->output_buffer_index, v->output_buffer_size, MSG_DONTWAIT|MSG_NOSIGNAL); | |
448 | if (n < 0 && errno == ENOTSOCK) | |
449 | v->prefer_read_write = true; | |
450 | } | |
451 | if (v->prefer_read_write) | |
452 | n = write(v->fd, v->output_buffer + v->output_buffer_index, v->output_buffer_size); | |
453 | if (n < 0) { | |
454 | if (errno == EAGAIN) | |
455 | return 0; | |
456 | ||
457 | if (ERRNO_IS_DISCONNECT(errno)) { | |
458 | /* If we get informed about a disconnect on write, then let's remember that, but not | |
459 | * act on it just yet. Let's wait for read() to report the issue first. */ | |
460 | v->write_disconnected = true; | |
461 | return 1; | |
462 | } | |
463 | ||
464 | return -errno; | |
465 | } | |
466 | ||
467 | v->output_buffer_size -= n; | |
468 | ||
469 | if (v->output_buffer_size == 0) | |
470 | v->output_buffer_index = 0; | |
471 | else | |
472 | v->output_buffer_index += n; | |
473 | ||
474 | v->timestamp = now(CLOCK_MONOTONIC); | |
475 | return 1; | |
476 | } | |
477 | ||
478 | static int varlink_read(Varlink *v) { | |
479 | size_t rs; | |
480 | ssize_t n; | |
481 | ||
482 | assert(v); | |
483 | ||
45a6c965 | 484 | if (!IN_SET(v->state, VARLINK_AWAITING_REPLY, VARLINK_AWAITING_REPLY_MORE, VARLINK_CALLING, VARLINK_IDLE_SERVER)) |
d41bd96f LP |
485 | return 0; |
486 | if (v->connecting) /* read() on a socket while we are in connect() will fail with EINVAL, hence exit early here */ | |
487 | return 0; | |
488 | if (v->current) | |
489 | return 0; | |
490 | if (v->input_buffer_unscanned > 0) | |
491 | return 0; | |
492 | if (v->read_disconnected) | |
493 | return 0; | |
494 | ||
495 | if (v->input_buffer_size >= VARLINK_BUFFER_MAX) | |
496 | return -ENOBUFS; | |
497 | ||
498 | assert(v->fd >= 0); | |
499 | ||
500 | if (v->input_buffer_allocated <= v->input_buffer_index + v->input_buffer_size) { | |
501 | size_t add; | |
502 | ||
503 | add = MIN(VARLINK_BUFFER_MAX - v->input_buffer_size, VARLINK_READ_SIZE); | |
504 | ||
505 | if (v->input_buffer_index == 0) { | |
506 | ||
507 | if (!GREEDY_REALLOC(v->input_buffer, v->input_buffer_allocated, v->input_buffer_size + add)) | |
508 | return -ENOMEM; | |
509 | ||
510 | } else { | |
511 | char *b; | |
512 | ||
513 | b = new(char, v->input_buffer_size + add); | |
514 | if (!b) | |
515 | return -ENOMEM; | |
516 | ||
517 | memcpy(b, v->input_buffer + v->input_buffer_index, v->input_buffer_size); | |
518 | ||
519 | free_and_replace(v->input_buffer, b); | |
520 | ||
521 | v->input_buffer_allocated = v->input_buffer_size + add; | |
522 | v->input_buffer_index = 0; | |
523 | } | |
524 | } | |
525 | ||
526 | rs = v->input_buffer_allocated - (v->input_buffer_index + v->input_buffer_size); | |
527 | ||
528 | if (!v->prefer_read_write) { | |
529 | n = recv(v->fd, v->input_buffer + v->input_buffer_index + v->input_buffer_size, rs, MSG_DONTWAIT); | |
530 | if (n < 0 && errno == ENOTSOCK) | |
531 | v->prefer_read_write = true; | |
532 | } | |
533 | if (v->prefer_read_write) | |
534 | n = read(v->fd, v->input_buffer + v->input_buffer_index + v->input_buffer_size, rs); | |
535 | if (n < 0) { | |
536 | if (errno == EAGAIN) | |
537 | return 0; | |
538 | ||
539 | if (ERRNO_IS_DISCONNECT(errno)) { | |
540 | v->read_disconnected = true; | |
541 | return 1; | |
542 | } | |
543 | ||
544 | return -errno; | |
545 | } | |
546 | if (n == 0) { /* EOF */ | |
547 | v->read_disconnected = true; | |
548 | return 1; | |
549 | } | |
550 | ||
551 | v->input_buffer_size += n; | |
552 | v->input_buffer_unscanned += n; | |
553 | ||
554 | return 1; | |
555 | } | |
556 | ||
557 | static int varlink_parse_message(Varlink *v) { | |
558 | const char *e, *begin; | |
559 | size_t sz; | |
560 | int r; | |
561 | ||
562 | assert(v); | |
563 | ||
564 | if (v->current) | |
565 | return 0; | |
566 | if (v->input_buffer_unscanned <= 0) | |
567 | return 0; | |
568 | ||
569 | assert(v->input_buffer_unscanned <= v->input_buffer_size); | |
570 | assert(v->input_buffer_index + v->input_buffer_size <= v->input_buffer_allocated); | |
571 | ||
572 | begin = v->input_buffer + v->input_buffer_index; | |
573 | ||
574 | e = memchr(begin + v->input_buffer_size - v->input_buffer_unscanned, 0, v->input_buffer_unscanned); | |
575 | if (!e) { | |
576 | v->input_buffer_unscanned = 0; | |
577 | return 0; | |
578 | } | |
579 | ||
580 | sz = e - begin + 1; | |
581 | ||
582 | varlink_log(v, "New incoming message: %s", begin); | |
583 | ||
d642f640 | 584 | r = json_parse(begin, 0, &v->current, NULL, NULL); |
d41bd96f LP |
585 | if (r < 0) |
586 | return r; | |
587 | ||
588 | v->input_buffer_size -= sz; | |
589 | ||
590 | if (v->input_buffer_size == 0) | |
591 | v->input_buffer_index = 0; | |
592 | else | |
593 | v->input_buffer_index += sz; | |
594 | ||
595 | v->input_buffer_unscanned = v->input_buffer_size; | |
596 | return 1; | |
597 | } | |
598 | ||
599 | static int varlink_test_timeout(Varlink *v) { | |
600 | assert(v); | |
601 | ||
45a6c965 | 602 | if (!IN_SET(v->state, VARLINK_AWAITING_REPLY, VARLINK_AWAITING_REPLY_MORE, VARLINK_CALLING)) |
d41bd96f LP |
603 | return 0; |
604 | if (v->timeout == USEC_INFINITY) | |
605 | return 0; | |
606 | ||
607 | if (now(CLOCK_MONOTONIC) < usec_add(v->timestamp, v->timeout)) | |
608 | return 0; | |
609 | ||
610 | varlink_set_state(v, VARLINK_PENDING_TIMEOUT); | |
611 | ||
612 | return 1; | |
613 | } | |
614 | ||
615 | static int varlink_dispatch_local_error(Varlink *v, const char *error) { | |
616 | int r; | |
617 | ||
618 | assert(v); | |
619 | assert(error); | |
620 | ||
621 | if (!v->reply_callback) | |
622 | return 0; | |
623 | ||
624 | r = v->reply_callback(v, NULL, error, VARLINK_REPLY_ERROR|VARLINK_REPLY_LOCAL, v->userdata); | |
625 | if (r < 0) | |
626 | log_debug_errno(r, "Reply callback returned error, ignoring: %m"); | |
627 | ||
628 | return 1; | |
629 | } | |
630 | ||
631 | static int varlink_dispatch_timeout(Varlink *v) { | |
632 | assert(v); | |
633 | ||
634 | if (v->state != VARLINK_PENDING_TIMEOUT) | |
635 | return 0; | |
636 | ||
637 | varlink_set_state(v, VARLINK_PROCESSING_TIMEOUT); | |
638 | varlink_dispatch_local_error(v, VARLINK_ERROR_TIMEOUT); | |
639 | varlink_close(v); | |
640 | ||
641 | return 1; | |
642 | } | |
643 | ||
644 | static int varlink_dispatch_disconnect(Varlink *v) { | |
645 | assert(v); | |
646 | ||
647 | if (v->state != VARLINK_PENDING_DISCONNECT) | |
648 | return 0; | |
649 | ||
650 | varlink_set_state(v, VARLINK_PROCESSING_DISCONNECT); | |
651 | varlink_dispatch_local_error(v, VARLINK_ERROR_DISCONNECTED); | |
652 | varlink_close(v); | |
653 | ||
654 | return 1; | |
655 | } | |
656 | ||
657 | static int varlink_sanitize_parameters(JsonVariant **v) { | |
658 | assert(v); | |
659 | ||
660 | /* Varlink always wants a parameters list, hence make one if the caller doesn't want any */ | |
661 | if (!*v) | |
662 | return json_variant_new_object(v, NULL, 0); | |
663 | else if (!json_variant_is_object(*v)) | |
664 | return -EINVAL; | |
665 | ||
666 | return 0; | |
667 | } | |
668 | ||
669 | static int varlink_dispatch_reply(Varlink *v) { | |
670 | _cleanup_(json_variant_unrefp) JsonVariant *parameters = NULL; | |
671 | VarlinkReplyFlags flags = 0; | |
672 | const char *error = NULL; | |
673 | JsonVariant *e; | |
674 | const char *k; | |
675 | int r; | |
676 | ||
677 | assert(v); | |
678 | ||
45a6c965 | 679 | if (!IN_SET(v->state, VARLINK_AWAITING_REPLY, VARLINK_AWAITING_REPLY_MORE, VARLINK_CALLING)) |
d41bd96f LP |
680 | return 0; |
681 | if (!v->current) | |
682 | return 0; | |
683 | ||
684 | assert(v->n_pending > 0); | |
685 | ||
686 | if (!json_variant_is_object(v->current)) | |
687 | goto invalid; | |
688 | ||
689 | JSON_VARIANT_OBJECT_FOREACH(k, e, v->current) { | |
690 | ||
691 | if (streq(k, "error")) { | |
692 | if (error) | |
693 | goto invalid; | |
694 | if (!json_variant_is_string(e)) | |
695 | goto invalid; | |
696 | ||
697 | error = json_variant_string(e); | |
698 | flags |= VARLINK_REPLY_ERROR; | |
699 | ||
700 | } else if (streq(k, "parameters")) { | |
701 | if (parameters) | |
702 | goto invalid; | |
703 | if (!json_variant_is_object(e)) | |
704 | goto invalid; | |
705 | ||
706 | parameters = json_variant_ref(e); | |
707 | ||
708 | } else if (streq(k, "continues")) { | |
709 | if (FLAGS_SET(flags, VARLINK_REPLY_CONTINUES)) | |
710 | goto invalid; | |
711 | ||
712 | if (!json_variant_is_boolean(e)) | |
713 | goto invalid; | |
714 | ||
715 | if (json_variant_boolean(e)) | |
716 | flags |= VARLINK_REPLY_CONTINUES; | |
717 | } else | |
718 | goto invalid; | |
719 | } | |
720 | ||
45a6c965 LP |
721 | /* Replies with 'continue' set are only OK if we set 'more' when the method call was initiated */ |
722 | if (v->state != VARLINK_AWAITING_REPLY_MORE && FLAGS_SET(flags, VARLINK_REPLY_CONTINUES)) | |
723 | goto invalid; | |
724 | ||
725 | /* An error is final */ | |
d41bd96f LP |
726 | if (error && FLAGS_SET(flags, VARLINK_REPLY_CONTINUES)) |
727 | goto invalid; | |
728 | ||
729 | r = varlink_sanitize_parameters(¶meters); | |
730 | if (r < 0) | |
731 | goto invalid; | |
732 | ||
45a6c965 | 733 | if (IN_SET(v->state, VARLINK_AWAITING_REPLY, VARLINK_AWAITING_REPLY_MORE)) { |
d41bd96f LP |
734 | varlink_set_state(v, VARLINK_PROCESSING_REPLY); |
735 | ||
736 | if (v->reply_callback) { | |
737 | r = v->reply_callback(v, parameters, error, flags, v->userdata); | |
738 | if (r < 0) | |
739 | log_debug_errno(r, "Reply callback returned error, ignoring: %m"); | |
740 | } | |
741 | ||
742 | v->current = json_variant_unref(v->current); | |
743 | ||
744 | if (v->state == VARLINK_PROCESSING_REPLY) { | |
45a6c965 | 745 | |
d41bd96f | 746 | assert(v->n_pending > 0); |
d41bd96f | 747 | |
45a6c965 LP |
748 | if (!FLAGS_SET(flags, VARLINK_REPLY_CONTINUES)) |
749 | v->n_pending--; | |
750 | ||
751 | varlink_set_state(v, | |
752 | FLAGS_SET(flags, VARLINK_REPLY_CONTINUES) ? VARLINK_AWAITING_REPLY_MORE : | |
753 | v->n_pending == 0 ? VARLINK_IDLE_CLIENT : VARLINK_AWAITING_REPLY); | |
d41bd96f LP |
754 | } |
755 | } else { | |
756 | assert(v->state == VARLINK_CALLING); | |
d41bd96f LP |
757 | varlink_set_state(v, VARLINK_CALLED); |
758 | } | |
759 | ||
760 | return 1; | |
761 | ||
762 | invalid: | |
763 | varlink_set_state(v, VARLINK_PROCESSING_FAILURE); | |
764 | varlink_dispatch_local_error(v, VARLINK_ERROR_PROTOCOL); | |
765 | varlink_close(v); | |
766 | ||
767 | return 1; | |
768 | } | |
769 | ||
770 | static int varlink_dispatch_method(Varlink *v) { | |
771 | _cleanup_(json_variant_unrefp) JsonVariant *parameters = NULL; | |
772 | VarlinkMethodFlags flags = 0; | |
773 | const char *method = NULL, *error; | |
774 | JsonVariant *e; | |
775 | VarlinkMethod callback; | |
776 | const char *k; | |
777 | int r; | |
778 | ||
779 | assert(v); | |
780 | ||
781 | if (v->state != VARLINK_IDLE_SERVER) | |
782 | return 0; | |
783 | if (!v->current) | |
784 | return 0; | |
785 | ||
786 | if (!json_variant_is_object(v->current)) | |
787 | goto invalid; | |
788 | ||
789 | JSON_VARIANT_OBJECT_FOREACH(k, e, v->current) { | |
790 | ||
791 | if (streq(k, "method")) { | |
792 | if (method) | |
793 | goto invalid; | |
794 | if (!json_variant_is_string(e)) | |
795 | goto invalid; | |
796 | ||
797 | method = json_variant_string(e); | |
798 | ||
799 | } else if (streq(k, "parameters")) { | |
800 | if (parameters) | |
801 | goto invalid; | |
802 | if (!json_variant_is_object(e)) | |
803 | goto invalid; | |
804 | ||
805 | parameters = json_variant_ref(e); | |
806 | ||
807 | } else if (streq(k, "oneway")) { | |
808 | ||
809 | if ((flags & (VARLINK_METHOD_ONEWAY|VARLINK_METHOD_MORE)) != 0) | |
810 | goto invalid; | |
811 | ||
812 | if (!json_variant_is_boolean(e)) | |
813 | goto invalid; | |
814 | ||
815 | if (json_variant_boolean(e)) | |
816 | flags |= VARLINK_METHOD_ONEWAY; | |
817 | ||
818 | } else if (streq(k, "more")) { | |
819 | ||
820 | if ((flags & (VARLINK_METHOD_ONEWAY|VARLINK_METHOD_MORE)) != 0) | |
821 | goto invalid; | |
822 | ||
823 | if (!json_variant_is_boolean(e)) | |
824 | goto invalid; | |
825 | ||
826 | if (json_variant_boolean(e)) | |
827 | flags |= VARLINK_METHOD_MORE; | |
828 | ||
829 | } else | |
830 | goto invalid; | |
831 | } | |
832 | ||
833 | if (!method) | |
834 | goto invalid; | |
835 | ||
836 | r = varlink_sanitize_parameters(¶meters); | |
837 | if (r < 0) | |
838 | goto fail; | |
839 | ||
840 | varlink_set_state(v, (flags & VARLINK_METHOD_MORE) ? VARLINK_PROCESSING_METHOD_MORE : | |
841 | (flags & VARLINK_METHOD_ONEWAY) ? VARLINK_PROCESSING_METHOD_ONEWAY : | |
842 | VARLINK_PROCESSING_METHOD); | |
843 | ||
844 | assert(v->server); | |
845 | ||
846 | if (STR_IN_SET(method, "org.varlink.service.GetInfo", "org.varlink.service.GetInterface")) { | |
847 | /* For now, we don't implement a single of varlink's own methods */ | |
848 | callback = NULL; | |
849 | error = VARLINK_ERROR_METHOD_NOT_IMPLEMENTED; | |
850 | } else if (startswith(method, "org.varlink.service.")) { | |
851 | callback = NULL; | |
852 | error = VARLINK_ERROR_METHOD_NOT_FOUND; | |
853 | } else { | |
854 | callback = hashmap_get(v->server->methods, method); | |
855 | error = VARLINK_ERROR_METHOD_NOT_FOUND; | |
856 | } | |
857 | ||
858 | if (callback) { | |
859 | r = callback(v, parameters, flags, v->userdata); | |
860 | if (r < 0) { | |
861 | log_debug_errno(r, "Callback for %s returned error: %m", method); | |
862 | ||
863 | /* We got an error back from the callback. Propagate it to the client if the method call remains unanswered. */ | |
864 | if (!FLAGS_SET(flags, VARLINK_METHOD_ONEWAY)) { | |
865 | r = varlink_errorb(v, VARLINK_ERROR_SYSTEM, JSON_BUILD_OBJECT(JSON_BUILD_PAIR("errno", JSON_BUILD_INTEGER(-r)))); | |
866 | if (r < 0) | |
867 | return r; | |
868 | } | |
869 | } | |
870 | } else if (!FLAGS_SET(flags, VARLINK_METHOD_ONEWAY)) { | |
871 | assert(error); | |
872 | ||
873 | r = varlink_errorb(v, error, JSON_BUILD_OBJECT(JSON_BUILD_PAIR("method", JSON_BUILD_STRING(method)))); | |
874 | if (r < 0) | |
875 | return r; | |
876 | } | |
877 | ||
878 | switch (v->state) { | |
879 | ||
880 | case VARLINK_PROCESSED_METHOD: /* Method call is fully processed */ | |
881 | case VARLINK_PROCESSING_METHOD_ONEWAY: /* ditto */ | |
882 | v->current = json_variant_unref(v->current); | |
883 | varlink_set_state(v, VARLINK_IDLE_SERVER); | |
884 | break; | |
885 | ||
886 | case VARLINK_PROCESSING_METHOD: /* Method call wasn't replied to, will be replied to later */ | |
887 | varlink_set_state(v, VARLINK_PENDING_METHOD); | |
888 | break; | |
889 | ||
d41bd96f LP |
890 | case VARLINK_PROCESSING_METHOD_MORE: /* No reply for a "more" message was sent, more to come */ |
891 | varlink_set_state(v, VARLINK_PENDING_METHOD_MORE); | |
892 | break; | |
893 | ||
894 | default: | |
895 | assert_not_reached("Unexpected state"); | |
896 | ||
897 | } | |
898 | ||
899 | return r; | |
900 | ||
901 | invalid: | |
902 | r = -EINVAL; | |
903 | ||
904 | fail: | |
905 | varlink_set_state(v, VARLINK_PROCESSING_FAILURE); | |
906 | varlink_dispatch_local_error(v, VARLINK_ERROR_PROTOCOL); | |
907 | varlink_close(v); | |
908 | ||
909 | return r; | |
910 | } | |
911 | ||
912 | int varlink_process(Varlink *v) { | |
913 | int r; | |
914 | ||
915 | assert_return(v, -EINVAL); | |
916 | ||
917 | if (v->state == VARLINK_DISCONNECTED) | |
918 | return -ENOTCONN; | |
919 | ||
920 | varlink_ref(v); | |
921 | ||
922 | r = varlink_write(v); | |
923 | if (r != 0) | |
924 | goto finish; | |
925 | ||
926 | r = varlink_dispatch_reply(v); | |
927 | if (r != 0) | |
928 | goto finish; | |
929 | ||
930 | r = varlink_dispatch_method(v); | |
931 | if (r != 0) | |
932 | goto finish; | |
933 | ||
934 | r = varlink_parse_message(v); | |
935 | if (r != 0) | |
936 | goto finish; | |
937 | ||
938 | r = varlink_read(v); | |
939 | if (r != 0) | |
940 | goto finish; | |
941 | ||
942 | r = varlink_test_disconnect(v); | |
943 | if (r != 0) | |
944 | goto finish; | |
945 | ||
946 | r = varlink_dispatch_disconnect(v); | |
947 | if (r != 0) | |
948 | goto finish; | |
949 | ||
950 | r = varlink_test_timeout(v); | |
951 | if (r != 0) | |
952 | goto finish; | |
953 | ||
954 | r = varlink_dispatch_timeout(v); | |
955 | if (r != 0) | |
956 | goto finish; | |
957 | ||
958 | finish: | |
959 | if (r >= 0 && v->defer_event_source) { | |
960 | int q; | |
961 | ||
962 | /* If we did some processing, make sure we are called again soon */ | |
963 | q = sd_event_source_set_enabled(v->defer_event_source, r > 0 ? SD_EVENT_ON : SD_EVENT_OFF); | |
964 | if (q < 0) | |
965 | r = q; | |
966 | } | |
967 | ||
968 | if (r < 0) { | |
969 | if (VARLINK_STATE_IS_ALIVE(v->state)) | |
970 | /* Initiate disconnection */ | |
971 | varlink_set_state(v, VARLINK_PENDING_DISCONNECT); | |
972 | else | |
973 | /* We failed while disconnecting, in that case close right away */ | |
974 | varlink_close(v); | |
975 | } | |
976 | ||
977 | varlink_unref(v); | |
978 | return r; | |
979 | } | |
980 | ||
981 | static void handle_revents(Varlink *v, int revents) { | |
982 | assert(v); | |
983 | ||
984 | if (v->connecting) { | |
985 | /* If we have seen POLLOUT or POLLHUP on a socket we are asynchronously waiting a connect() | |
986 | * to complete on, we know we are ready. We don't read the connection error here though, | |
987 | * we'll get the error on the next read() or write(). */ | |
988 | if ((revents & (POLLOUT|POLLHUP)) == 0) | |
989 | return; | |
990 | ||
991 | varlink_log(v, "Anynchronous connection completed."); | |
992 | v->connecting = false; | |
993 | } else { | |
994 | /* Note that we don't care much about POLLIN/POLLOUT here, we'll just try reading and writing | |
995 | * what we can. However, we do care about POLLHUP to detect connection termination even if we | |
996 | * momentarily don't want to read nor write anything. */ | |
997 | ||
998 | if (!FLAGS_SET(revents, POLLHUP)) | |
999 | return; | |
1000 | ||
1001 | varlink_log(v, "Got POLLHUP from socket."); | |
1002 | v->got_pollhup = true; | |
1003 | } | |
1004 | } | |
1005 | ||
1006 | int varlink_wait(Varlink *v, usec_t timeout) { | |
d41bd96f LP |
1007 | int r, fd, events; |
1008 | usec_t t; | |
1009 | ||
1010 | assert_return(v, -EINVAL); | |
d41bd96f LP |
1011 | |
1012 | if (v->state == VARLINK_DISCONNECTED) | |
1013 | return -ENOTCONN; | |
1014 | ||
1015 | r = varlink_get_timeout(v, &t); | |
1016 | if (r < 0) | |
1017 | return r; | |
1018 | if (t != USEC_INFINITY) { | |
1019 | usec_t n; | |
1020 | ||
1021 | n = now(CLOCK_MONOTONIC); | |
1022 | if (t < n) | |
1023 | t = 0; | |
1024 | else | |
1025 | t = usec_sub_unsigned(t, n); | |
1026 | } | |
1027 | ||
1028 | if (timeout != USEC_INFINITY && | |
1029 | (t == USEC_INFINITY || timeout < t)) | |
1030 | t = timeout; | |
1031 | ||
1032 | fd = varlink_get_fd(v); | |
1033 | if (fd < 0) | |
1034 | return fd; | |
1035 | ||
1036 | events = varlink_get_events(v); | |
1037 | if (events < 0) | |
1038 | return events; | |
1039 | ||
0f2d351f | 1040 | r = fd_wait_for_event(fd, events, t); |
d41bd96f | 1041 | if (r < 0) |
0f2d351f | 1042 | return r; |
dad28bff LP |
1043 | if (r == 0) |
1044 | return 0; | |
d41bd96f | 1045 | |
0f2d351f | 1046 | handle_revents(v, r); |
dad28bff | 1047 | return 1; |
d41bd96f LP |
1048 | } |
1049 | ||
1050 | int varlink_get_fd(Varlink *v) { | |
1051 | ||
1052 | assert_return(v, -EINVAL); | |
1053 | ||
1054 | if (v->state == VARLINK_DISCONNECTED) | |
1055 | return -ENOTCONN; | |
1056 | if (v->fd < 0) | |
1057 | return -EBADF; | |
1058 | ||
1059 | return v->fd; | |
1060 | } | |
1061 | ||
1062 | int varlink_get_events(Varlink *v) { | |
1063 | int ret = 0; | |
1064 | ||
1065 | assert_return(v, -EINVAL); | |
1066 | ||
1067 | if (v->state == VARLINK_DISCONNECTED) | |
1068 | return -ENOTCONN; | |
1069 | ||
1070 | if (v->connecting) /* When processing an asynchronous connect(), we only wait for EPOLLOUT, which | |
1071 | * tells us that the connection is now complete. Before that we should neither | |
1072 | * write() or read() from the fd. */ | |
1073 | return EPOLLOUT; | |
1074 | ||
1075 | if (!v->read_disconnected && | |
45a6c965 | 1076 | IN_SET(v->state, VARLINK_AWAITING_REPLY, VARLINK_AWAITING_REPLY_MORE, VARLINK_CALLING, VARLINK_IDLE_SERVER) && |
d41bd96f LP |
1077 | !v->current && |
1078 | v->input_buffer_unscanned <= 0) | |
1079 | ret |= EPOLLIN; | |
1080 | ||
1081 | if (!v->write_disconnected && | |
1082 | v->output_buffer_size > 0) | |
1083 | ret |= EPOLLOUT; | |
1084 | ||
1085 | return ret; | |
1086 | } | |
1087 | ||
1088 | int varlink_get_timeout(Varlink *v, usec_t *ret) { | |
1089 | assert_return(v, -EINVAL); | |
1090 | ||
1091 | if (v->state == VARLINK_DISCONNECTED) | |
1092 | return -ENOTCONN; | |
1093 | ||
45a6c965 | 1094 | if (IN_SET(v->state, VARLINK_AWAITING_REPLY, VARLINK_AWAITING_REPLY_MORE, VARLINK_CALLING) && |
d41bd96f LP |
1095 | v->timeout != USEC_INFINITY) { |
1096 | if (ret) | |
1097 | *ret = usec_add(v->timestamp, v->timeout); | |
1098 | return 1; | |
1099 | } else { | |
1100 | if (ret) | |
1101 | *ret = USEC_INFINITY; | |
1102 | return 0; | |
1103 | } | |
1104 | } | |
1105 | ||
1106 | int varlink_flush(Varlink *v) { | |
1107 | int ret = 0, r; | |
1108 | ||
1109 | assert_return(v, -EINVAL); | |
1110 | ||
1111 | if (v->state == VARLINK_DISCONNECTED) | |
1112 | return -ENOTCONN; | |
1113 | ||
1114 | for (;;) { | |
d41bd96f LP |
1115 | if (v->output_buffer_size == 0) |
1116 | break; | |
1117 | if (v->write_disconnected) | |
1118 | return -ECONNRESET; | |
1119 | ||
1120 | r = varlink_write(v); | |
1121 | if (r < 0) | |
1122 | return r; | |
1123 | if (r > 0) { | |
1124 | ret = 1; | |
1125 | continue; | |
1126 | } | |
1127 | ||
0f2d351f | 1128 | r = fd_wait_for_event(v->fd, POLLOUT, USEC_INFINITY); |
dad28bff | 1129 | if (r < 0) |
0f2d351f | 1130 | return r; |
d41bd96f | 1131 | |
0f2d351f | 1132 | assert(r != 0); |
dad28bff | 1133 | |
0f2d351f | 1134 | handle_revents(v, r); |
d41bd96f LP |
1135 | } |
1136 | ||
1137 | return ret; | |
1138 | } | |
1139 | ||
1140 | static void varlink_detach_server(Varlink *v) { | |
6d4d6002 | 1141 | VarlinkServer *saved_server; |
d41bd96f LP |
1142 | assert(v); |
1143 | ||
1144 | if (!v->server) | |
1145 | return; | |
1146 | ||
1147 | if (v->server->by_uid && | |
1148 | v->ucred_acquired && | |
1149 | uid_is_valid(v->ucred.uid)) { | |
1150 | unsigned c; | |
1151 | ||
1152 | c = PTR_TO_UINT(hashmap_get(v->server->by_uid, UID_TO_PTR(v->ucred.uid))); | |
1153 | assert(c > 0); | |
1154 | ||
1155 | if (c == 1) | |
1156 | (void) hashmap_remove(v->server->by_uid, UID_TO_PTR(v->ucred.uid)); | |
1157 | else | |
1158 | (void) hashmap_replace(v->server->by_uid, UID_TO_PTR(v->ucred.uid), UINT_TO_PTR(c - 1)); | |
1159 | } | |
1160 | ||
1161 | assert(v->server->n_connections > 0); | |
1162 | v->server->n_connections--; | |
1163 | ||
1164 | /* If this is a connection associated to a server, then let's disconnect the server and the | |
6d4d6002 LP |
1165 | * connection from each other. This drops the dangling reference that connect_callback() set up. But |
1166 | * before we release the references, let's call the disconnection callback if it is defined. */ | |
1167 | ||
1168 | saved_server = TAKE_PTR(v->server); | |
1169 | ||
1170 | if (saved_server->disconnect_callback) | |
1171 | saved_server->disconnect_callback(saved_server, v, saved_server->userdata); | |
1172 | ||
1173 | varlink_server_unref(saved_server); | |
d41bd96f LP |
1174 | varlink_unref(v); |
1175 | } | |
1176 | ||
1177 | int varlink_close(Varlink *v) { | |
1178 | ||
1179 | assert_return(v, -EINVAL); | |
1180 | ||
1181 | if (v->state == VARLINK_DISCONNECTED) | |
1182 | return 0; | |
1183 | ||
1184 | varlink_set_state(v, VARLINK_DISCONNECTED); | |
1185 | ||
1186 | /* Let's take a reference first, since varlink_detach_server() might drop the final (dangling) ref | |
1187 | * which would destroy us before we can call varlink_clear() */ | |
1188 | varlink_ref(v); | |
1189 | varlink_detach_server(v); | |
1190 | varlink_clear(v); | |
1191 | varlink_unref(v); | |
1192 | ||
1193 | return 1; | |
1194 | } | |
1195 | ||
9652d740 LP |
1196 | Varlink* varlink_close_unref(Varlink *v) { |
1197 | ||
1198 | if (!v) | |
1199 | return NULL; | |
1200 | ||
1201 | (void) varlink_close(v); | |
1202 | return varlink_unref(v); | |
1203 | } | |
1204 | ||
d41bd96f LP |
1205 | Varlink* varlink_flush_close_unref(Varlink *v) { |
1206 | ||
1207 | if (!v) | |
1208 | return NULL; | |
1209 | ||
1210 | (void) varlink_flush(v); | |
1211 | (void) varlink_close(v); | |
d41bd96f LP |
1212 | return varlink_unref(v); |
1213 | } | |
1214 | ||
1215 | static int varlink_enqueue_json(Varlink *v, JsonVariant *m) { | |
1216 | _cleanup_free_ char *text = NULL; | |
1217 | int r; | |
1218 | ||
1219 | assert(v); | |
1220 | assert(m); | |
1221 | ||
1222 | r = json_variant_format(m, 0, &text); | |
1223 | if (r < 0) | |
1224 | return r; | |
2a04712c | 1225 | assert(text[r] == '\0'); |
d41bd96f LP |
1226 | |
1227 | if (v->output_buffer_size + r + 1 > VARLINK_BUFFER_MAX) | |
1228 | return -ENOBUFS; | |
1229 | ||
1230 | varlink_log(v, "Sending message: %s", text); | |
1231 | ||
1232 | if (v->output_buffer_size == 0) { | |
1233 | ||
1234 | free_and_replace(v->output_buffer, text); | |
1235 | ||
1236 | v->output_buffer_size = v->output_buffer_allocated = r + 1; | |
1237 | v->output_buffer_index = 0; | |
1238 | ||
1239 | } else if (v->output_buffer_index == 0) { | |
1240 | ||
1241 | if (!GREEDY_REALLOC(v->output_buffer, v->output_buffer_allocated, v->output_buffer_size + r + 1)) | |
1242 | return -ENOMEM; | |
1243 | ||
1244 | memcpy(v->output_buffer + v->output_buffer_size, text, r + 1); | |
1245 | v->output_buffer_size += r + 1; | |
1246 | ||
1247 | } else { | |
1248 | char *n; | |
be44e091 | 1249 | const size_t new_size = v->output_buffer_size + r + 1; |
d41bd96f | 1250 | |
be44e091 | 1251 | n = new(char, new_size); |
d41bd96f LP |
1252 | if (!n) |
1253 | return -ENOMEM; | |
1254 | ||
1255 | memcpy(mempcpy(n, v->output_buffer + v->output_buffer_index, v->output_buffer_size), text, r + 1); | |
1256 | ||
1257 | free_and_replace(v->output_buffer, n); | |
be44e091 | 1258 | v->output_buffer_allocated = v->output_buffer_size = new_size; |
d41bd96f LP |
1259 | v->output_buffer_index = 0; |
1260 | } | |
1261 | ||
1262 | return 0; | |
1263 | } | |
1264 | ||
1265 | int varlink_send(Varlink *v, const char *method, JsonVariant *parameters) { | |
1266 | _cleanup_(json_variant_unrefp) JsonVariant *m = NULL; | |
1267 | int r; | |
1268 | ||
1269 | assert_return(v, -EINVAL); | |
1270 | assert_return(method, -EINVAL); | |
1271 | ||
1272 | if (v->state == VARLINK_DISCONNECTED) | |
1273 | return -ENOTCONN; | |
45a6c965 LP |
1274 | |
1275 | /* We allow enqueuing multiple method calls at once! */ | |
d41bd96f LP |
1276 | if (!IN_SET(v->state, VARLINK_IDLE_CLIENT, VARLINK_AWAITING_REPLY)) |
1277 | return -EBUSY; | |
1278 | ||
1279 | r = varlink_sanitize_parameters(¶meters); | |
1280 | if (r < 0) | |
1281 | return r; | |
1282 | ||
1283 | r = json_build(&m, JSON_BUILD_OBJECT( | |
1284 | JSON_BUILD_PAIR("method", JSON_BUILD_STRING(method)), | |
1285 | JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters)), | |
1286 | JSON_BUILD_PAIR("oneway", JSON_BUILD_BOOLEAN(true)))); | |
1287 | if (r < 0) | |
1288 | return r; | |
1289 | ||
1290 | r = varlink_enqueue_json(v, m); | |
1291 | if (r < 0) | |
1292 | return r; | |
1293 | ||
1294 | /* No state change here, this is one-way only after all */ | |
1295 | v->timestamp = now(CLOCK_MONOTONIC); | |
1296 | return 0; | |
1297 | } | |
1298 | ||
1299 | int varlink_sendb(Varlink *v, const char *method, ...) { | |
1300 | _cleanup_(json_variant_unrefp) JsonVariant *parameters = NULL; | |
1301 | va_list ap; | |
1302 | int r; | |
1303 | ||
1304 | assert_return(v, -EINVAL); | |
1305 | ||
1306 | va_start(ap, method); | |
1307 | r = json_buildv(¶meters, ap); | |
1308 | va_end(ap); | |
1309 | ||
1310 | if (r < 0) | |
1311 | return r; | |
1312 | ||
1313 | return varlink_send(v, method, parameters); | |
1314 | } | |
1315 | ||
1316 | int varlink_invoke(Varlink *v, const char *method, JsonVariant *parameters) { | |
1317 | _cleanup_(json_variant_unrefp) JsonVariant *m = NULL; | |
1318 | int r; | |
1319 | ||
1320 | assert_return(v, -EINVAL); | |
1321 | assert_return(method, -EINVAL); | |
1322 | ||
1323 | if (v->state == VARLINK_DISCONNECTED) | |
1324 | return -ENOTCONN; | |
45a6c965 | 1325 | |
86b52a39 | 1326 | /* We allow enqueuing multiple method calls at once! */ |
d41bd96f LP |
1327 | if (!IN_SET(v->state, VARLINK_IDLE_CLIENT, VARLINK_AWAITING_REPLY)) |
1328 | return -EBUSY; | |
1329 | ||
1330 | r = varlink_sanitize_parameters(¶meters); | |
1331 | if (r < 0) | |
1332 | return r; | |
1333 | ||
1334 | r = json_build(&m, JSON_BUILD_OBJECT( | |
1335 | JSON_BUILD_PAIR("method", JSON_BUILD_STRING(method)), | |
1336 | JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters)))); | |
1337 | if (r < 0) | |
1338 | return r; | |
1339 | ||
1340 | r = varlink_enqueue_json(v, m); | |
1341 | if (r < 0) | |
1342 | return r; | |
1343 | ||
1344 | varlink_set_state(v, VARLINK_AWAITING_REPLY); | |
1345 | v->n_pending++; | |
1346 | v->timestamp = now(CLOCK_MONOTONIC); | |
1347 | ||
1348 | return 0; | |
1349 | } | |
1350 | ||
1351 | int varlink_invokeb(Varlink *v, const char *method, ...) { | |
1352 | _cleanup_(json_variant_unrefp) JsonVariant *parameters = NULL; | |
1353 | va_list ap; | |
1354 | int r; | |
1355 | ||
1356 | assert_return(v, -EINVAL); | |
1357 | ||
1358 | va_start(ap, method); | |
1359 | r = json_buildv(¶meters, ap); | |
1360 | va_end(ap); | |
1361 | ||
1362 | if (r < 0) | |
1363 | return r; | |
1364 | ||
1365 | return varlink_invoke(v, method, parameters); | |
45a6c965 LP |
1366 | } |
1367 | ||
1368 | int varlink_observe(Varlink *v, const char *method, JsonVariant *parameters) { | |
1369 | _cleanup_(json_variant_unrefp) JsonVariant *m = NULL; | |
1370 | int r; | |
1371 | ||
1372 | assert_return(v, -EINVAL); | |
1373 | assert_return(method, -EINVAL); | |
1374 | ||
1375 | if (v->state == VARLINK_DISCONNECTED) | |
1376 | return -ENOTCONN; | |
1377 | /* Note that we don't allow enqueuing multiple method calls when we are in more/continues mode! We | |
1378 | * thus insist on an idle client here. */ | |
1379 | if (v->state != VARLINK_IDLE_CLIENT) | |
1380 | return -EBUSY; | |
1381 | ||
1382 | r = varlink_sanitize_parameters(¶meters); | |
1383 | if (r < 0) | |
1384 | return r; | |
1385 | ||
1386 | r = json_build(&m, JSON_BUILD_OBJECT( | |
1387 | JSON_BUILD_PAIR("method", JSON_BUILD_STRING(method)), | |
1388 | JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters)), | |
1389 | JSON_BUILD_PAIR("more", JSON_BUILD_BOOLEAN(true)))); | |
1390 | if (r < 0) | |
1391 | return r; | |
1392 | ||
1393 | r = varlink_enqueue_json(v, m); | |
1394 | if (r < 0) | |
1395 | return r; | |
1396 | ||
1397 | ||
1398 | varlink_set_state(v, VARLINK_AWAITING_REPLY_MORE); | |
1399 | v->n_pending++; | |
1400 | v->timestamp = now(CLOCK_MONOTONIC); | |
1401 | ||
1402 | return 0; | |
1403 | } | |
1404 | ||
1405 | int varlink_observeb(Varlink *v, const char *method, ...) { | |
1406 | _cleanup_(json_variant_unrefp) JsonVariant *parameters = NULL; | |
1407 | va_list ap; | |
1408 | int r; | |
1409 | ||
1410 | assert_return(v, -EINVAL); | |
1411 | ||
1412 | va_start(ap, method); | |
1413 | r = json_buildv(¶meters, ap); | |
1414 | va_end(ap); | |
1415 | ||
1416 | if (r < 0) | |
1417 | return r; | |
1418 | ||
1419 | return varlink_observe(v, method, parameters); | |
d41bd96f LP |
1420 | } |
1421 | ||
1422 | int varlink_call( | |
1423 | Varlink *v, | |
1424 | const char *method, | |
1425 | JsonVariant *parameters, | |
1426 | JsonVariant **ret_parameters, | |
1427 | const char **ret_error_id, | |
1428 | VarlinkReplyFlags *ret_flags) { | |
1429 | ||
1430 | _cleanup_(json_variant_unrefp) JsonVariant *m = NULL; | |
1431 | int r; | |
1432 | ||
1433 | assert_return(v, -EINVAL); | |
1434 | assert_return(method, -EINVAL); | |
1435 | ||
1436 | if (v->state == VARLINK_DISCONNECTED) | |
1437 | return -ENOTCONN; | |
1438 | if (!IN_SET(v->state, VARLINK_IDLE_CLIENT)) | |
1439 | return -EBUSY; | |
1440 | ||
1441 | assert(v->n_pending == 0); /* n_pending can't be > 0 if we are in VARLINK_IDLE_CLIENT state */ | |
1442 | ||
1443 | r = varlink_sanitize_parameters(¶meters); | |
1444 | if (r < 0) | |
1445 | return r; | |
1446 | ||
1447 | r = json_build(&m, JSON_BUILD_OBJECT( | |
1448 | JSON_BUILD_PAIR("method", JSON_BUILD_STRING(method)), | |
1449 | JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters)))); | |
1450 | if (r < 0) | |
1451 | return r; | |
1452 | ||
1453 | r = varlink_enqueue_json(v, m); | |
1454 | if (r < 0) | |
1455 | return r; | |
1456 | ||
1457 | varlink_set_state(v, VARLINK_CALLING); | |
1458 | v->n_pending++; | |
1459 | v->timestamp = now(CLOCK_MONOTONIC); | |
1460 | ||
1461 | while (v->state == VARLINK_CALLING) { | |
1462 | ||
1463 | r = varlink_process(v); | |
1464 | if (r < 0) | |
1465 | return r; | |
1466 | if (r > 0) | |
1467 | continue; | |
1468 | ||
1469 | r = varlink_wait(v, USEC_INFINITY); | |
1470 | if (r < 0) | |
1471 | return r; | |
1472 | } | |
1473 | ||
1474 | switch (v->state) { | |
1475 | ||
1476 | case VARLINK_CALLED: | |
1477 | assert(v->current); | |
1478 | ||
1479 | json_variant_unref(v->reply); | |
1480 | v->reply = TAKE_PTR(v->current); | |
1481 | ||
1482 | varlink_set_state(v, VARLINK_IDLE_CLIENT); | |
1483 | assert(v->n_pending == 1); | |
1484 | v->n_pending--; | |
1485 | ||
1486 | if (ret_parameters) | |
1487 | *ret_parameters = json_variant_by_key(v->reply, "parameters"); | |
1488 | if (ret_error_id) | |
1489 | *ret_error_id = json_variant_string(json_variant_by_key(v->reply, "error")); | |
1490 | if (ret_flags) | |
1491 | *ret_flags = 0; | |
1492 | ||
1493 | return 1; | |
1494 | ||
1495 | case VARLINK_PENDING_DISCONNECT: | |
1496 | case VARLINK_DISCONNECTED: | |
1497 | return -ECONNRESET; | |
1498 | ||
1499 | case VARLINK_PENDING_TIMEOUT: | |
1500 | return -ETIME; | |
1501 | ||
1502 | default: | |
1503 | assert_not_reached("Unexpected state after method call."); | |
1504 | } | |
1505 | } | |
1506 | ||
1507 | int varlink_callb( | |
1508 | Varlink *v, | |
1509 | const char *method, | |
1510 | JsonVariant **ret_parameters, | |
1511 | const char **ret_error_id, | |
1512 | VarlinkReplyFlags *ret_flags, ...) { | |
1513 | ||
1514 | _cleanup_(json_variant_unrefp) JsonVariant *parameters = NULL; | |
1515 | va_list ap; | |
1516 | int r; | |
1517 | ||
1518 | assert_return(v, -EINVAL); | |
1519 | ||
1520 | va_start(ap, ret_flags); | |
1521 | r = json_buildv(¶meters, ap); | |
1522 | va_end(ap); | |
1523 | ||
1524 | if (r < 0) | |
1525 | return r; | |
1526 | ||
1527 | return varlink_call(v, method, parameters, ret_parameters, ret_error_id, ret_flags); | |
1528 | } | |
1529 | ||
1530 | int varlink_reply(Varlink *v, JsonVariant *parameters) { | |
1531 | _cleanup_(json_variant_unrefp) JsonVariant *m = NULL; | |
1532 | int r; | |
1533 | ||
1534 | assert_return(v, -EINVAL); | |
1535 | ||
1536 | if (v->state == VARLINK_DISCONNECTED) | |
1537 | return -ENOTCONN; | |
1538 | if (!IN_SET(v->state, | |
1539 | VARLINK_PROCESSING_METHOD, VARLINK_PROCESSING_METHOD_MORE, | |
1540 | VARLINK_PENDING_METHOD, VARLINK_PENDING_METHOD_MORE)) | |
1541 | return -EBUSY; | |
1542 | ||
1543 | r = varlink_sanitize_parameters(¶meters); | |
1544 | if (r < 0) | |
1545 | return r; | |
1546 | ||
1547 | r = json_build(&m, JSON_BUILD_OBJECT(JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters)))); | |
1548 | if (r < 0) | |
1549 | return r; | |
1550 | ||
1551 | r = varlink_enqueue_json(v, m); | |
1552 | if (r < 0) | |
1553 | return r; | |
1554 | ||
1555 | if (IN_SET(v->state, VARLINK_PENDING_METHOD, VARLINK_PENDING_METHOD_MORE)) { | |
1556 | /* We just replied to a method call that was let hanging for a while (i.e. we were outside of | |
1557 | * the varlink_dispatch_method() stack frame), which means with this reply we are ready to | |
1558 | * process further messages. */ | |
1559 | v->current = json_variant_unref(v->current); | |
1560 | varlink_set_state(v, VARLINK_IDLE_SERVER); | |
1561 | } else | |
1562 | /* We replied to a method call from within the varlink_dispatch_method() stack frame), which | |
1563 | * means we should it handle the rest of the state engine. */ | |
1564 | varlink_set_state(v, VARLINK_PROCESSED_METHOD); | |
1565 | ||
1566 | return 1; | |
1567 | } | |
1568 | ||
1569 | int varlink_replyb(Varlink *v, ...) { | |
1570 | _cleanup_(json_variant_unrefp) JsonVariant *parameters = NULL; | |
1571 | va_list ap; | |
1572 | int r; | |
1573 | ||
1574 | assert_return(v, -EINVAL); | |
1575 | ||
1576 | va_start(ap, v); | |
1577 | r = json_buildv(¶meters, ap); | |
1578 | va_end(ap); | |
1579 | ||
1580 | if (r < 0) | |
1581 | return r; | |
1582 | ||
1583 | return varlink_reply(v, parameters); | |
1584 | } | |
1585 | ||
1586 | int varlink_error(Varlink *v, const char *error_id, JsonVariant *parameters) { | |
1587 | _cleanup_(json_variant_unrefp) JsonVariant *m = NULL; | |
1588 | int r; | |
1589 | ||
1590 | assert_return(v, -EINVAL); | |
1591 | assert_return(error_id, -EINVAL); | |
1592 | ||
1593 | if (v->state == VARLINK_DISCONNECTED) | |
1594 | return -ENOTCONN; | |
1595 | if (!IN_SET(v->state, | |
1596 | VARLINK_PROCESSING_METHOD, VARLINK_PROCESSING_METHOD_MORE, | |
1597 | VARLINK_PENDING_METHOD, VARLINK_PENDING_METHOD_MORE)) | |
1598 | return -EBUSY; | |
1599 | ||
1600 | r = varlink_sanitize_parameters(¶meters); | |
1601 | if (r < 0) | |
1602 | return r; | |
1603 | ||
1604 | r = json_build(&m, JSON_BUILD_OBJECT( | |
1605 | JSON_BUILD_PAIR("error", JSON_BUILD_STRING(error_id)), | |
1606 | JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters)))); | |
1607 | if (r < 0) | |
1608 | return r; | |
1609 | ||
1610 | r = varlink_enqueue_json(v, m); | |
1611 | if (r < 0) | |
1612 | return r; | |
1613 | ||
1614 | if (IN_SET(v->state, VARLINK_PENDING_METHOD, VARLINK_PENDING_METHOD_MORE)) { | |
1615 | v->current = json_variant_unref(v->current); | |
1616 | varlink_set_state(v, VARLINK_IDLE_SERVER); | |
1617 | } else | |
1618 | varlink_set_state(v, VARLINK_PROCESSED_METHOD); | |
1619 | ||
1620 | return 1; | |
1621 | } | |
1622 | ||
1623 | int varlink_errorb(Varlink *v, const char *error_id, ...) { | |
1624 | _cleanup_(json_variant_unrefp) JsonVariant *parameters = NULL; | |
1625 | va_list ap; | |
1626 | int r; | |
1627 | ||
1628 | assert_return(v, -EINVAL); | |
1629 | assert_return(error_id, -EINVAL); | |
1630 | ||
1631 | va_start(ap, error_id); | |
1632 | r = json_buildv(¶meters, ap); | |
1633 | va_end(ap); | |
1634 | ||
1635 | if (r < 0) | |
1636 | return r; | |
1637 | ||
1638 | return varlink_error(v, error_id, parameters); | |
1639 | } | |
1640 | ||
1641 | int varlink_error_invalid_parameter(Varlink *v, JsonVariant *parameters) { | |
1642 | ||
1643 | assert_return(v, -EINVAL); | |
1644 | assert_return(parameters, -EINVAL); | |
1645 | ||
1646 | /* We expect to be called in one of two ways: the 'parameters' argument is a string variant in which | |
1647 | * case it is the parameter key name that is invalid. Or the 'parameters' argument is an object | |
1648 | * variant in which case we'll pull out the first key. The latter mode is useful in functions that | |
1649 | * don't expect any arguments. */ | |
1650 | ||
1651 | if (json_variant_is_string(parameters)) | |
1652 | return varlink_error(v, VARLINK_ERROR_INVALID_PARAMETER, parameters); | |
1653 | ||
1654 | if (json_variant_is_object(parameters) && | |
1655 | json_variant_elements(parameters) > 0) | |
1656 | return varlink_error(v, VARLINK_ERROR_INVALID_PARAMETER, | |
1657 | json_variant_by_index(parameters, 0)); | |
1658 | ||
1659 | return -EINVAL; | |
1660 | } | |
1661 | ||
1662 | int varlink_notify(Varlink *v, JsonVariant *parameters) { | |
1663 | _cleanup_(json_variant_unrefp) JsonVariant *m = NULL; | |
1664 | int r; | |
1665 | ||
1666 | assert_return(v, -EINVAL); | |
1667 | ||
1668 | if (v->state == VARLINK_DISCONNECTED) | |
1669 | return -ENOTCONN; | |
1670 | if (!IN_SET(v->state, VARLINK_PROCESSING_METHOD_MORE, VARLINK_PENDING_METHOD_MORE)) | |
1671 | return -EBUSY; | |
1672 | ||
1673 | r = varlink_sanitize_parameters(¶meters); | |
1674 | if (r < 0) | |
1675 | return r; | |
1676 | ||
1677 | r = json_build(&m, JSON_BUILD_OBJECT( | |
1678 | JSON_BUILD_PAIR("parameters", JSON_BUILD_VARIANT(parameters)), | |
1679 | JSON_BUILD_PAIR("continues", JSON_BUILD_BOOLEAN(true)))); | |
1680 | if (r < 0) | |
1681 | return r; | |
1682 | ||
1683 | r = varlink_enqueue_json(v, m); | |
1684 | if (r < 0) | |
1685 | return r; | |
1686 | ||
1687 | /* No state change, as more is coming */ | |
1688 | return 1; | |
1689 | } | |
1690 | ||
1691 | int varlink_notifyb(Varlink *v, ...) { | |
1692 | _cleanup_(json_variant_unrefp) JsonVariant *parameters = NULL; | |
1693 | va_list ap; | |
1694 | int r; | |
1695 | ||
1696 | assert_return(v, -EINVAL); | |
1697 | ||
1698 | va_start(ap, v); | |
1699 | r = json_buildv(¶meters, ap); | |
1700 | va_end(ap); | |
1701 | ||
1702 | if (r < 0) | |
1703 | return r; | |
1704 | ||
1705 | return varlink_notify(v, parameters); | |
1706 | } | |
1707 | ||
1708 | int varlink_bind_reply(Varlink *v, VarlinkReply callback) { | |
1709 | assert_return(v, -EINVAL); | |
1710 | ||
1711 | if (callback && v->reply_callback && callback != v->reply_callback) | |
1712 | return -EBUSY; | |
1713 | ||
1714 | v->reply_callback = callback; | |
1715 | ||
1716 | return 0; | |
1717 | } | |
1718 | ||
1719 | void* varlink_set_userdata(Varlink *v, void *userdata) { | |
1720 | void *old; | |
1721 | ||
1722 | assert_return(v, NULL); | |
1723 | ||
1724 | old = v->userdata; | |
1725 | v->userdata = userdata; | |
1726 | ||
1727 | return old; | |
1728 | } | |
1729 | ||
1730 | void* varlink_get_userdata(Varlink *v) { | |
1731 | assert_return(v, NULL); | |
1732 | ||
1733 | return v->userdata; | |
1734 | } | |
1735 | ||
1736 | static int varlink_acquire_ucred(Varlink *v) { | |
1737 | int r; | |
1738 | ||
1739 | assert(v); | |
1740 | ||
1741 | if (v->ucred_acquired) | |
1742 | return 0; | |
1743 | ||
1744 | r = getpeercred(v->fd, &v->ucred); | |
1745 | if (r < 0) | |
1746 | return r; | |
1747 | ||
1748 | v->ucred_acquired = true; | |
1749 | return 0; | |
1750 | } | |
1751 | ||
1752 | int varlink_get_peer_uid(Varlink *v, uid_t *ret) { | |
1753 | int r; | |
1754 | ||
1755 | assert_return(v, -EINVAL); | |
1756 | assert_return(ret, -EINVAL); | |
1757 | ||
1758 | r = varlink_acquire_ucred(v); | |
1759 | if (r < 0) | |
1760 | return r; | |
1761 | ||
1762 | if (!uid_is_valid(v->ucred.uid)) | |
1763 | return -ENODATA; | |
1764 | ||
1765 | *ret = v->ucred.uid; | |
1766 | return 0; | |
1767 | } | |
1768 | ||
1769 | int varlink_get_peer_pid(Varlink *v, pid_t *ret) { | |
1770 | int r; | |
1771 | ||
1772 | assert_return(v, -EINVAL); | |
1773 | assert_return(ret, -EINVAL); | |
1774 | ||
1775 | r = varlink_acquire_ucred(v); | |
1776 | if (r < 0) | |
1777 | return r; | |
1778 | ||
1779 | if (!pid_is_valid(v->ucred.pid)) | |
1780 | return -ENODATA; | |
1781 | ||
1782 | *ret = v->ucred.pid; | |
1783 | return 0; | |
1784 | } | |
1785 | ||
1786 | int varlink_set_relative_timeout(Varlink *v, usec_t timeout) { | |
1787 | assert_return(v, -EINVAL); | |
1788 | assert_return(timeout > 0, -EINVAL); | |
1789 | ||
1790 | v->timeout = timeout; | |
1791 | return 0; | |
1792 | } | |
1793 | ||
1794 | VarlinkServer *varlink_get_server(Varlink *v) { | |
1795 | assert_return(v, NULL); | |
1796 | ||
1797 | return v->server; | |
1798 | } | |
1799 | ||
1800 | int varlink_set_description(Varlink *v, const char *description) { | |
1801 | assert_return(v, -EINVAL); | |
1802 | ||
1803 | return free_and_strdup(&v->description, description); | |
1804 | } | |
1805 | ||
1806 | static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
1807 | Varlink *v = userdata; | |
1808 | ||
1809 | assert(s); | |
1810 | assert(v); | |
1811 | ||
1812 | handle_revents(v, revents); | |
1813 | (void) varlink_process(v); | |
1814 | ||
1815 | return 1; | |
1816 | } | |
1817 | ||
1818 | static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) { | |
1819 | Varlink *v = userdata; | |
1820 | ||
1821 | assert(s); | |
1822 | assert(v); | |
1823 | ||
1824 | (void) varlink_process(v); | |
1825 | return 1; | |
1826 | } | |
1827 | ||
1828 | static int defer_callback(sd_event_source *s, void *userdata) { | |
1829 | Varlink *v = userdata; | |
1830 | ||
1831 | assert(s); | |
1832 | assert(v); | |
1833 | ||
1834 | (void) varlink_process(v); | |
1835 | return 1; | |
1836 | } | |
1837 | ||
1838 | static int prepare_callback(sd_event_source *s, void *userdata) { | |
1839 | Varlink *v = userdata; | |
1840 | int r, e; | |
1841 | usec_t until; | |
f1194f5d | 1842 | bool have_timeout; |
d41bd96f LP |
1843 | |
1844 | assert(s); | |
1845 | assert(v); | |
1846 | ||
1847 | e = varlink_get_events(v); | |
1848 | if (e < 0) | |
1849 | return e; | |
1850 | ||
1851 | r = sd_event_source_set_io_events(v->io_event_source, e); | |
1852 | if (r < 0) | |
1853 | return r; | |
1854 | ||
1855 | r = varlink_get_timeout(v, &until); | |
1856 | if (r < 0) | |
1857 | return r; | |
f1194f5d LP |
1858 | have_timeout = r > 0; |
1859 | ||
1860 | if (have_timeout) { | |
d41bd96f LP |
1861 | r = sd_event_source_set_time(v->time_event_source, until); |
1862 | if (r < 0) | |
1863 | return r; | |
1864 | } | |
1865 | ||
f1194f5d | 1866 | r = sd_event_source_set_enabled(v->time_event_source, have_timeout ? SD_EVENT_ON : SD_EVENT_OFF); |
d41bd96f LP |
1867 | if (r < 0) |
1868 | return r; | |
1869 | ||
1870 | return 1; | |
1871 | } | |
1872 | ||
1873 | static int quit_callback(sd_event_source *event, void *userdata) { | |
1874 | Varlink *v = userdata; | |
1875 | ||
1876 | assert(event); | |
1877 | assert(v); | |
1878 | ||
1879 | varlink_flush(v); | |
1880 | varlink_close(v); | |
1881 | ||
1882 | return 1; | |
1883 | } | |
1884 | ||
1885 | int varlink_attach_event(Varlink *v, sd_event *e, int64_t priority) { | |
1886 | int r; | |
1887 | ||
1888 | assert_return(v, -EINVAL); | |
1889 | assert_return(!v->event, -EBUSY); | |
1890 | ||
1891 | if (e) | |
1892 | v->event = sd_event_ref(e); | |
1893 | else { | |
1894 | r = sd_event_default(&v->event); | |
1895 | if (r < 0) | |
1896 | return r; | |
1897 | } | |
1898 | ||
1899 | r = sd_event_add_time(v->event, &v->time_event_source, CLOCK_MONOTONIC, 0, 0, time_callback, v); | |
1900 | if (r < 0) | |
1901 | goto fail; | |
1902 | ||
1903 | r = sd_event_source_set_priority(v->time_event_source, priority); | |
1904 | if (r < 0) | |
1905 | goto fail; | |
1906 | ||
1907 | (void) sd_event_source_set_description(v->time_event_source, "varlink-time"); | |
1908 | ||
1909 | r = sd_event_add_exit(v->event, &v->quit_event_source, quit_callback, v); | |
1910 | if (r < 0) | |
1911 | goto fail; | |
1912 | ||
1913 | r = sd_event_source_set_priority(v->quit_event_source, priority); | |
1914 | if (r < 0) | |
1915 | goto fail; | |
1916 | ||
1917 | (void) sd_event_source_set_description(v->quit_event_source, "varlink-quit"); | |
1918 | ||
1919 | r = sd_event_add_io(v->event, &v->io_event_source, v->fd, 0, io_callback, v); | |
1920 | if (r < 0) | |
1921 | goto fail; | |
1922 | ||
1923 | r = sd_event_source_set_prepare(v->io_event_source, prepare_callback); | |
1924 | if (r < 0) | |
1925 | goto fail; | |
1926 | ||
1927 | r = sd_event_source_set_priority(v->io_event_source, priority); | |
1928 | if (r < 0) | |
1929 | goto fail; | |
1930 | ||
1931 | (void) sd_event_source_set_description(v->io_event_source, "varlink-io"); | |
1932 | ||
1933 | r = sd_event_add_defer(v->event, &v->defer_event_source, defer_callback, v); | |
1934 | if (r < 0) | |
1935 | goto fail; | |
1936 | ||
1937 | r = sd_event_source_set_priority(v->defer_event_source, priority); | |
1938 | if (r < 0) | |
1939 | goto fail; | |
1940 | ||
1941 | (void) sd_event_source_set_description(v->defer_event_source, "varlink-defer"); | |
1942 | ||
1943 | return 0; | |
1944 | ||
1945 | fail: | |
1946 | varlink_detach_event(v); | |
1947 | return r; | |
1948 | } | |
1949 | ||
d41bd96f LP |
1950 | void varlink_detach_event(Varlink *v) { |
1951 | if (!v) | |
1952 | return; | |
1953 | ||
1954 | varlink_detach_event_sources(v); | |
1955 | ||
1956 | v->event = sd_event_unref(v->event); | |
1957 | } | |
1958 | ||
1959 | sd_event *varlink_get_event(Varlink *v) { | |
1960 | assert_return(v, NULL); | |
1961 | ||
1962 | return v->event; | |
1963 | } | |
1964 | ||
1965 | int varlink_server_new(VarlinkServer **ret, VarlinkServerFlags flags) { | |
1966 | VarlinkServer *s; | |
1967 | ||
1968 | assert_return(ret, -EINVAL); | |
1969 | assert_return((flags & ~_VARLINK_SERVER_FLAGS_ALL) == 0, -EINVAL); | |
1970 | ||
1971 | s = new(VarlinkServer, 1); | |
1972 | if (!s) | |
1973 | return -ENOMEM; | |
1974 | ||
1975 | *s = (VarlinkServer) { | |
1976 | .n_ref = 1, | |
1977 | .flags = flags, | |
1978 | .connections_max = varlink_server_connections_max(NULL), | |
1979 | .connections_per_uid_max = varlink_server_connections_per_uid_max(NULL), | |
1980 | }; | |
1981 | ||
1982 | *ret = s; | |
1983 | return 0; | |
1984 | } | |
1985 | ||
1986 | static VarlinkServer* varlink_server_destroy(VarlinkServer *s) { | |
1987 | char *m; | |
1988 | ||
1989 | if (!s) | |
1990 | return NULL; | |
1991 | ||
1992 | varlink_server_shutdown(s); | |
1993 | ||
1994 | while ((m = hashmap_steal_first_key(s->methods))) | |
1995 | free(m); | |
1996 | ||
1997 | hashmap_free(s->methods); | |
1998 | hashmap_free(s->by_uid); | |
1999 | ||
2000 | sd_event_unref(s->event); | |
2001 | ||
2002 | free(s->description); | |
2003 | ||
2004 | return mfree(s); | |
2005 | } | |
2006 | ||
2007 | DEFINE_TRIVIAL_REF_UNREF_FUNC(VarlinkServer, varlink_server, varlink_server_destroy); | |
2008 | ||
2009 | static int validate_connection(VarlinkServer *server, const struct ucred *ucred) { | |
2010 | int allowed = -1; | |
2011 | ||
2012 | assert(server); | |
2013 | assert(ucred); | |
2014 | ||
2015 | if (FLAGS_SET(server->flags, VARLINK_SERVER_ROOT_ONLY)) | |
2016 | allowed = ucred->uid == 0; | |
2017 | ||
2018 | if (FLAGS_SET(server->flags, VARLINK_SERVER_MYSELF_ONLY)) | |
2019 | allowed = allowed > 0 || ucred->uid == getuid(); | |
2020 | ||
2021 | if (allowed == 0) { /* Allow access when it is explicitly allowed or when neither | |
2022 | * VARLINK_SERVER_ROOT_ONLY nor VARLINK_SERVER_MYSELF_ONLY are specified. */ | |
2023 | varlink_server_log(server, "Unprivileged client attempted connection, refusing."); | |
2024 | return 0; | |
2025 | } | |
2026 | ||
2027 | if (server->n_connections >= server->connections_max) { | |
2028 | varlink_server_log(server, "Connection limit of %u reached, refusing.", server->connections_max); | |
2029 | return 0; | |
2030 | } | |
2031 | ||
2032 | if (FLAGS_SET(server->flags, VARLINK_SERVER_ACCOUNT_UID)) { | |
2033 | unsigned c; | |
2034 | ||
2035 | if (!uid_is_valid(ucred->uid)) { | |
2036 | varlink_server_log(server, "Client with invalid UID attempted connection, refusing."); | |
2037 | return 0; | |
2038 | } | |
2039 | ||
2040 | c = PTR_TO_UINT(hashmap_get(server->by_uid, UID_TO_PTR(ucred->uid))); | |
2041 | if (c >= server->connections_per_uid_max) { | |
2042 | varlink_server_log(server, "Per-UID connection limit of %u reached, refusing.", | |
2043 | server->connections_per_uid_max); | |
2044 | return 0; | |
2045 | } | |
2046 | } | |
2047 | ||
2048 | return 1; | |
2049 | } | |
2050 | ||
2051 | static int count_connection(VarlinkServer *server, struct ucred *ucred) { | |
2052 | unsigned c; | |
2053 | int r; | |
2054 | ||
2055 | assert(server); | |
2056 | assert(ucred); | |
2057 | ||
2058 | server->n_connections++; | |
2059 | ||
2060 | if (FLAGS_SET(server->flags, VARLINK_SERVER_ACCOUNT_UID)) { | |
2061 | r = hashmap_ensure_allocated(&server->by_uid, NULL); | |
2062 | if (r < 0) | |
2063 | return log_debug_errno(r, "Failed to allocate UID hash table: %m"); | |
2064 | ||
2065 | c = PTR_TO_UINT(hashmap_get(server->by_uid, UID_TO_PTR(ucred->uid))); | |
2066 | ||
2067 | varlink_server_log(server, "Connections of user " UID_FMT ": %u (of %u max)", | |
2068 | ucred->uid, c, server->connections_per_uid_max); | |
2069 | ||
2070 | r = hashmap_replace(server->by_uid, UID_TO_PTR(ucred->uid), UINT_TO_PTR(c + 1)); | |
2071 | if (r < 0) | |
2072 | return log_debug_errno(r, "Failed to increment counter in UID hash table: %m"); | |
2073 | } | |
2074 | ||
2075 | return 0; | |
2076 | } | |
2077 | ||
2078 | int varlink_server_add_connection(VarlinkServer *server, int fd, Varlink **ret) { | |
2079 | _cleanup_(varlink_unrefp) Varlink *v = NULL; | |
2080 | bool ucred_acquired; | |
2081 | struct ucred ucred; | |
2082 | int r; | |
2083 | ||
2084 | assert_return(server, -EINVAL); | |
2085 | assert_return(fd >= 0, -EBADF); | |
2086 | ||
2087 | if ((server->flags & (VARLINK_SERVER_ROOT_ONLY|VARLINK_SERVER_ACCOUNT_UID)) != 0) { | |
2088 | r = getpeercred(fd, &ucred); | |
2089 | if (r < 0) | |
2090 | return varlink_server_log_errno(server, r, "Failed to acquire peer credentials of incoming socket, refusing: %m"); | |
2091 | ||
2092 | ucred_acquired = true; | |
2093 | ||
2094 | r = validate_connection(server, &ucred); | |
2095 | if (r < 0) | |
2096 | return r; | |
2097 | if (r == 0) | |
2098 | return -EPERM; | |
2099 | } else | |
2100 | ucred_acquired = false; | |
2101 | ||
2102 | r = varlink_new(&v); | |
2103 | if (r < 0) | |
2104 | return varlink_server_log_errno(server, r, "Failed to allocate connection object: %m"); | |
2105 | ||
2106 | r = count_connection(server, &ucred); | |
2107 | if (r < 0) | |
2108 | return r; | |
2109 | ||
2110 | v->fd = fd; | |
2111 | v->userdata = server->userdata; | |
2112 | if (ucred_acquired) { | |
2113 | v->ucred = ucred; | |
2114 | v->ucred_acquired = true; | |
2115 | } | |
2116 | ||
2117 | (void) asprintf(&v->description, "%s-%i", server->description ?: "varlink", v->fd); | |
2118 | ||
2119 | /* Link up the server and the connection, and take reference in both directions. Note that the | |
2120 | * reference on the connection is left dangling. It will be dropped when the connection is closed, | |
2121 | * which happens in varlink_close(), including in the event loop quit callback. */ | |
2122 | v->server = varlink_server_ref(server); | |
2123 | varlink_ref(v); | |
2124 | ||
2125 | varlink_set_state(v, VARLINK_IDLE_SERVER); | |
2126 | ||
7e69d90c LP |
2127 | if (server->event) { |
2128 | r = varlink_attach_event(v, server->event, server->event_priority); | |
2129 | if (r < 0) { | |
2130 | varlink_log_errno(v, r, "Failed to attach new connection: %m"); | |
2131 | v->fd = -1; /* take the fd out of the connection again */ | |
2132 | varlink_close(v); | |
2133 | return r; | |
2134 | } | |
d41bd96f LP |
2135 | } |
2136 | ||
2137 | if (ret) | |
2138 | *ret = v; | |
2139 | ||
2140 | return 0; | |
2141 | } | |
2142 | ||
2143 | static int connect_callback(sd_event_source *source, int fd, uint32_t revents, void *userdata) { | |
2144 | VarlinkServerSocket *ss = userdata; | |
2145 | _cleanup_close_ int cfd = -1; | |
2146 | Varlink *v = NULL; | |
2147 | int r; | |
2148 | ||
2149 | assert(source); | |
2150 | assert(ss); | |
2151 | ||
2152 | varlink_server_log(ss->server, "New incoming connection."); | |
2153 | ||
2154 | cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC); | |
2155 | if (cfd < 0) { | |
2156 | if (ERRNO_IS_ACCEPT_AGAIN(errno)) | |
2157 | return 0; | |
2158 | ||
2159 | return varlink_server_log_errno(ss->server, errno, "Failed to accept incoming socket: %m"); | |
2160 | } | |
2161 | ||
2162 | r = varlink_server_add_connection(ss->server, cfd, &v); | |
2163 | if (r < 0) | |
2164 | return 0; | |
2165 | ||
2166 | TAKE_FD(cfd); | |
2167 | ||
2168 | if (ss->server->connect_callback) { | |
2169 | r = ss->server->connect_callback(ss->server, v, ss->server->userdata); | |
2170 | if (r < 0) { | |
2171 | varlink_log_errno(v, r, "Connection callback returned error, disconnecting client: %m"); | |
2172 | varlink_close(v); | |
2173 | return 0; | |
2174 | } | |
2175 | } | |
2176 | ||
2177 | return 0; | |
2178 | } | |
2179 | ||
2180 | int varlink_server_listen_fd(VarlinkServer *s, int fd) { | |
2181 | _cleanup_free_ VarlinkServerSocket *ss = NULL; | |
2182 | int r; | |
2183 | ||
2184 | assert_return(s, -EINVAL); | |
2185 | assert_return(fd >= 0, -EBADF); | |
2186 | ||
2187 | r = fd_nonblock(fd, true); | |
2188 | if (r < 0) | |
2189 | return r; | |
2190 | ||
2191 | ss = new(VarlinkServerSocket, 1); | |
2192 | if (!ss) | |
2193 | return -ENOMEM; | |
2194 | ||
2195 | *ss = (VarlinkServerSocket) { | |
2196 | .server = s, | |
2197 | .fd = fd, | |
2198 | }; | |
2199 | ||
2200 | if (s->event) { | |
2201 | _cleanup_(sd_event_source_unrefp) sd_event_source *es = NULL; | |
2202 | ||
2203 | r = sd_event_add_io(s->event, &es, fd, EPOLLIN, connect_callback, ss); | |
2204 | if (r < 0) | |
2205 | return r; | |
2206 | ||
2207 | r = sd_event_source_set_priority(ss->event_source, s->event_priority); | |
2208 | if (r < 0) | |
2209 | return r; | |
2210 | } | |
2211 | ||
2212 | LIST_PREPEND(sockets, s->sockets, TAKE_PTR(ss)); | |
2213 | return 0; | |
2214 | } | |
2215 | ||
2216 | int varlink_server_listen_address(VarlinkServer *s, const char *address, mode_t m) { | |
2217 | union sockaddr_union sockaddr; | |
f36a9d59 | 2218 | socklen_t sockaddr_len; |
d41bd96f LP |
2219 | _cleanup_close_ int fd = -1; |
2220 | int r; | |
2221 | ||
2222 | assert_return(s, -EINVAL); | |
2223 | assert_return(address, -EINVAL); | |
2224 | assert_return((m & ~0777) == 0, -EINVAL); | |
2225 | ||
2226 | r = sockaddr_un_set_path(&sockaddr.un, address); | |
2227 | if (r < 0) | |
2228 | return r; | |
f36a9d59 | 2229 | sockaddr_len = r; |
d41bd96f LP |
2230 | |
2231 | fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); | |
2232 | if (fd < 0) | |
2233 | return -errno; | |
2234 | ||
a0c41de2 LP |
2235 | fd = fd_move_above_stdio(fd); |
2236 | ||
d41bd96f LP |
2237 | (void) sockaddr_un_unlink(&sockaddr.un); |
2238 | ||
2239 | RUN_WITH_UMASK(~m & 0777) | |
f36a9d59 | 2240 | if (bind(fd, &sockaddr.sa, sockaddr_len) < 0) |
d41bd96f LP |
2241 | return -errno; |
2242 | ||
2243 | if (listen(fd, SOMAXCONN) < 0) | |
2244 | return -errno; | |
2245 | ||
2246 | r = varlink_server_listen_fd(s, fd); | |
2247 | if (r < 0) | |
2248 | return r; | |
2249 | ||
2250 | TAKE_FD(fd); | |
2251 | return 0; | |
2252 | } | |
2253 | ||
2254 | void* varlink_server_set_userdata(VarlinkServer *s, void *userdata) { | |
2255 | void *ret; | |
2256 | ||
2257 | assert_return(s, NULL); | |
2258 | ||
2259 | ret = s->userdata; | |
2260 | s->userdata = userdata; | |
2261 | ||
2262 | return ret; | |
2263 | } | |
2264 | ||
2265 | void* varlink_server_get_userdata(VarlinkServer *s) { | |
2266 | assert_return(s, NULL); | |
2267 | ||
2268 | return s->userdata; | |
2269 | } | |
2270 | ||
2271 | static VarlinkServerSocket* varlink_server_socket_destroy(VarlinkServerSocket *ss) { | |
2272 | if (!ss) | |
2273 | return NULL; | |
2274 | ||
2275 | if (ss->server) | |
2276 | LIST_REMOVE(sockets, ss->server->sockets, ss); | |
2277 | ||
1d3fe304 | 2278 | sd_event_source_disable_unref(ss->event_source); |
d41bd96f LP |
2279 | |
2280 | free(ss->address); | |
2281 | safe_close(ss->fd); | |
2282 | ||
2283 | return mfree(ss); | |
2284 | } | |
2285 | ||
2286 | int varlink_server_shutdown(VarlinkServer *s) { | |
2287 | assert_return(s, -EINVAL); | |
2288 | ||
2289 | while (s->sockets) | |
2290 | varlink_server_socket_destroy(s->sockets); | |
2291 | ||
2292 | return 0; | |
2293 | } | |
2294 | ||
2295 | int varlink_server_attach_event(VarlinkServer *s, sd_event *e, int64_t priority) { | |
2296 | VarlinkServerSocket *ss; | |
2297 | int r; | |
2298 | ||
2299 | assert_return(s, -EINVAL); | |
2300 | assert_return(!s->event, -EBUSY); | |
2301 | ||
2302 | if (e) | |
2303 | s->event = sd_event_ref(e); | |
2304 | else { | |
2305 | r = sd_event_default(&s->event); | |
2306 | if (r < 0) | |
2307 | return r; | |
2308 | } | |
2309 | ||
2310 | LIST_FOREACH(sockets, ss, s->sockets) { | |
2311 | assert(!ss->event_source); | |
2312 | ||
2313 | r = sd_event_add_io(s->event, &ss->event_source, ss->fd, EPOLLIN, connect_callback, ss); | |
2314 | if (r < 0) | |
2315 | goto fail; | |
2316 | ||
2317 | r = sd_event_source_set_priority(ss->event_source, priority); | |
2318 | if (r < 0) | |
2319 | goto fail; | |
2320 | } | |
2321 | ||
2322 | s->event_priority = priority; | |
2323 | return 0; | |
2324 | ||
2325 | fail: | |
2326 | varlink_server_detach_event(s); | |
2327 | return r; | |
2328 | } | |
2329 | ||
2330 | int varlink_server_detach_event(VarlinkServer *s) { | |
2331 | VarlinkServerSocket *ss; | |
2332 | ||
2333 | assert_return(s, -EINVAL); | |
2334 | ||
2335 | LIST_FOREACH(sockets, ss, s->sockets) { | |
2336 | ||
2337 | if (!ss->event_source) | |
2338 | continue; | |
2339 | ||
2340 | (void) sd_event_source_set_enabled(ss->event_source, SD_EVENT_OFF); | |
2341 | ss->event_source = sd_event_source_unref(ss->event_source); | |
2342 | } | |
2343 | ||
2344 | sd_event_unref(s->event); | |
2345 | return 0; | |
2346 | } | |
2347 | ||
2348 | sd_event *varlink_server_get_event(VarlinkServer *s) { | |
2349 | assert_return(s, NULL); | |
2350 | ||
2351 | return s->event; | |
2352 | } | |
2353 | ||
2354 | int varlink_server_bind_method(VarlinkServer *s, const char *method, VarlinkMethod callback) { | |
2355 | char *m; | |
2356 | int r; | |
2357 | ||
2358 | assert_return(s, -EINVAL); | |
2359 | assert_return(method, -EINVAL); | |
2360 | assert_return(callback, -EINVAL); | |
2361 | ||
2362 | if (startswith(method, "org.varlink.service.")) | |
2363 | return -EEXIST; | |
2364 | ||
2365 | r = hashmap_ensure_allocated(&s->methods, &string_hash_ops); | |
2366 | if (r < 0) | |
2367 | return r; | |
2368 | ||
2369 | m = strdup(method); | |
2370 | if (!m) | |
2371 | return -ENOMEM; | |
2372 | ||
2373 | r = hashmap_put(s->methods, m, callback); | |
2374 | if (r < 0) { | |
2375 | free(m); | |
2376 | return r; | |
2377 | } | |
2378 | ||
2379 | return 0; | |
2380 | } | |
2381 | ||
2382 | int varlink_server_bind_method_many_internal(VarlinkServer *s, ...) { | |
2383 | va_list ap; | |
e7b93f97 | 2384 | int r = 0; |
d41bd96f LP |
2385 | |
2386 | assert_return(s, -EINVAL); | |
2387 | ||
2388 | va_start(ap, s); | |
2389 | for (;;) { | |
2390 | VarlinkMethod callback; | |
2391 | const char *method; | |
2392 | ||
2393 | method = va_arg(ap, const char *); | |
2394 | if (!method) | |
2395 | break; | |
2396 | ||
2397 | callback = va_arg(ap, VarlinkMethod); | |
2398 | ||
2399 | r = varlink_server_bind_method(s, method, callback); | |
2400 | if (r < 0) | |
e7b93f97 | 2401 | break; |
d41bd96f | 2402 | } |
e7b93f97 | 2403 | va_end(ap); |
d41bd96f | 2404 | |
e7b93f97 | 2405 | return r; |
d41bd96f LP |
2406 | } |
2407 | ||
2408 | int varlink_server_bind_connect(VarlinkServer *s, VarlinkConnect callback) { | |
2409 | assert_return(s, -EINVAL); | |
2410 | ||
2411 | if (callback && s->connect_callback && callback != s->connect_callback) | |
2412 | return -EBUSY; | |
2413 | ||
2414 | s->connect_callback = callback; | |
2415 | return 0; | |
2416 | } | |
2417 | ||
6d4d6002 LP |
2418 | int varlink_server_bind_disconnect(VarlinkServer *s, VarlinkDisconnect callback) { |
2419 | assert_return(s, -EINVAL); | |
2420 | ||
2421 | if (callback && s->disconnect_callback && callback != s->disconnect_callback) | |
2422 | return -EBUSY; | |
2423 | ||
2424 | s->disconnect_callback = callback; | |
2425 | return 0; | |
2426 | } | |
2427 | ||
d41bd96f | 2428 | unsigned varlink_server_connections_max(VarlinkServer *s) { |
88a36d36 | 2429 | int dts; |
d41bd96f LP |
2430 | |
2431 | /* If a server is specified, return the setting for that server, otherwise the default value */ | |
2432 | if (s) | |
2433 | return s->connections_max; | |
2434 | ||
88a36d36 LP |
2435 | dts = getdtablesize(); |
2436 | assert_se(dts > 0); | |
d41bd96f LP |
2437 | |
2438 | /* Make sure we never use up more than ¾th of RLIMIT_NOFILE for IPC */ | |
88a36d36 LP |
2439 | if (VARLINK_DEFAULT_CONNECTIONS_MAX > (unsigned) dts / 4 * 3) |
2440 | return dts / 4 * 3; | |
d41bd96f LP |
2441 | |
2442 | return VARLINK_DEFAULT_CONNECTIONS_MAX; | |
2443 | } | |
2444 | ||
2445 | unsigned varlink_server_connections_per_uid_max(VarlinkServer *s) { | |
2446 | unsigned m; | |
2447 | ||
2448 | if (s) | |
2449 | return s->connections_per_uid_max; | |
2450 | ||
2451 | /* Make sure to never use up more than ¾th of available connections for a single user */ | |
2452 | m = varlink_server_connections_max(NULL); | |
2453 | if (VARLINK_DEFAULT_CONNECTIONS_PER_UID_MAX > m) | |
2454 | return m / 4 * 3; | |
2455 | ||
2456 | return VARLINK_DEFAULT_CONNECTIONS_PER_UID_MAX; | |
2457 | } | |
2458 | ||
2459 | int varlink_server_set_connections_per_uid_max(VarlinkServer *s, unsigned m) { | |
2460 | assert_return(s, -EINVAL); | |
2461 | assert_return(m > 0, -EINVAL); | |
2462 | ||
2463 | s->connections_per_uid_max = m; | |
2464 | return 0; | |
2465 | } | |
2466 | ||
2467 | int varlink_server_set_connections_max(VarlinkServer *s, unsigned m) { | |
2468 | assert_return(s, -EINVAL); | |
2469 | assert_return(m > 0, -EINVAL); | |
2470 | ||
2471 | s->connections_max = m; | |
2472 | return 0; | |
2473 | } | |
2474 | ||
c4f601f2 LP |
2475 | unsigned varlink_server_current_connections(VarlinkServer *s) { |
2476 | assert_return(s, UINT_MAX); | |
2477 | ||
2478 | return s->n_connections; | |
2479 | } | |
2480 | ||
d41bd96f LP |
2481 | int varlink_server_set_description(VarlinkServer *s, const char *description) { |
2482 | assert_return(s, -EINVAL); | |
2483 | ||
2484 | return free_and_strdup(&s->description, description); | |
2485 | } |