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Commit | Line | Data |
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60f067b4 JS |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2005-2008 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
60f067b4 | 20 | #include <errno.h> |
db2df898 MP |
21 | #include <poll.h> |
22 | #include <pthread.h> | |
60f067b4 | 23 | #include <resolv.h> |
db2df898 | 24 | #include <signal.h> |
60f067b4 | 25 | #include <stdint.h> |
db2df898 MP |
26 | #include <stdio.h> |
27 | #include <stdlib.h> | |
28 | #include <string.h> | |
60f067b4 | 29 | #include <sys/prctl.h> |
db2df898 | 30 | #include <unistd.h> |
60f067b4 | 31 | |
db2df898 MP |
32 | #include "sd-resolve.h" |
33 | ||
34 | #include "alloc-util.h" | |
35 | #include "fd-util.h" | |
36 | #include "io-util.h" | |
60f067b4 | 37 | #include "list.h" |
60f067b4 | 38 | #include "missing.h" |
db2df898 MP |
39 | #include "socket-util.h" |
40 | #include "util.h" | |
60f067b4 JS |
41 | |
42 | #define WORKERS_MIN 1U | |
43 | #define WORKERS_MAX 16U | |
44 | #define QUERIES_MAX 256U | |
45 | #define BUFSIZE 10240U | |
46 | ||
47 | typedef enum { | |
48 | REQUEST_ADDRINFO, | |
49 | RESPONSE_ADDRINFO, | |
50 | REQUEST_NAMEINFO, | |
51 | RESPONSE_NAMEINFO, | |
60f067b4 JS |
52 | REQUEST_TERMINATE, |
53 | RESPONSE_DIED | |
54 | } QueryType; | |
55 | ||
56 | enum { | |
57 | REQUEST_RECV_FD, | |
58 | REQUEST_SEND_FD, | |
59 | RESPONSE_RECV_FD, | |
60 | RESPONSE_SEND_FD, | |
61 | _FD_MAX | |
62 | }; | |
63 | ||
64 | struct sd_resolve { | |
65 | unsigned n_ref; | |
66 | ||
67 | bool dead:1; | |
68 | pid_t original_pid; | |
69 | ||
70 | int fds[_FD_MAX]; | |
71 | ||
72 | pthread_t workers[WORKERS_MAX]; | |
73 | unsigned n_valid_workers; | |
74 | ||
5eef597e | 75 | unsigned current_id; |
60f067b4 | 76 | sd_resolve_query* query_array[QUERIES_MAX]; |
5eef597e | 77 | unsigned n_queries, n_done, n_outstanding; |
60f067b4 JS |
78 | |
79 | sd_event_source *event_source; | |
80 | sd_event *event; | |
81 | ||
82 | sd_resolve_query *current; | |
83 | ||
84 | sd_resolve **default_resolve_ptr; | |
85 | pid_t tid; | |
86 | ||
87 | LIST_HEAD(sd_resolve_query, queries); | |
88 | }; | |
89 | ||
90 | struct sd_resolve_query { | |
91 | unsigned n_ref; | |
92 | ||
93 | sd_resolve *resolve; | |
94 | ||
95 | QueryType type:4; | |
96 | bool done:1; | |
97 | bool floating:1; | |
98 | unsigned id; | |
99 | ||
100 | int ret; | |
101 | int _errno; | |
102 | int _h_errno; | |
103 | struct addrinfo *addrinfo; | |
104 | char *serv, *host; | |
60f067b4 JS |
105 | |
106 | union { | |
107 | sd_resolve_getaddrinfo_handler_t getaddrinfo_handler; | |
108 | sd_resolve_getnameinfo_handler_t getnameinfo_handler; | |
60f067b4 JS |
109 | }; |
110 | ||
111 | void *userdata; | |
112 | ||
113 | LIST_FIELDS(sd_resolve_query, queries); | |
114 | }; | |
115 | ||
116 | typedef struct RHeader { | |
117 | QueryType type; | |
118 | unsigned id; | |
119 | size_t length; | |
120 | } RHeader; | |
121 | ||
122 | typedef struct AddrInfoRequest { | |
123 | struct RHeader header; | |
124 | bool hints_valid; | |
125 | int ai_flags; | |
126 | int ai_family; | |
127 | int ai_socktype; | |
128 | int ai_protocol; | |
129 | size_t node_len, service_len; | |
130 | } AddrInfoRequest; | |
131 | ||
132 | typedef struct AddrInfoResponse { | |
133 | struct RHeader header; | |
134 | int ret; | |
135 | int _errno; | |
136 | int _h_errno; | |
137 | /* followed by addrinfo_serialization[] */ | |
138 | } AddrInfoResponse; | |
139 | ||
140 | typedef struct AddrInfoSerialization { | |
141 | int ai_flags; | |
142 | int ai_family; | |
143 | int ai_socktype; | |
144 | int ai_protocol; | |
145 | size_t ai_addrlen; | |
146 | size_t canonname_len; | |
147 | /* Followed by ai_addr amd ai_canonname with variable lengths */ | |
148 | } AddrInfoSerialization; | |
149 | ||
150 | typedef struct NameInfoRequest { | |
151 | struct RHeader header; | |
152 | int flags; | |
153 | socklen_t sockaddr_len; | |
154 | bool gethost:1, getserv:1; | |
155 | } NameInfoRequest; | |
156 | ||
157 | typedef struct NameInfoResponse { | |
158 | struct RHeader header; | |
159 | size_t hostlen, servlen; | |
160 | int ret; | |
161 | int _errno; | |
162 | int _h_errno; | |
163 | } NameInfoResponse; | |
164 | ||
60f067b4 JS |
165 | typedef union Packet { |
166 | RHeader rheader; | |
167 | AddrInfoRequest addrinfo_request; | |
168 | AddrInfoResponse addrinfo_response; | |
169 | NameInfoRequest nameinfo_request; | |
170 | NameInfoResponse nameinfo_response; | |
60f067b4 JS |
171 | } Packet; |
172 | ||
173 | static int getaddrinfo_done(sd_resolve_query* q); | |
174 | static int getnameinfo_done(sd_resolve_query *q); | |
60f067b4 JS |
175 | |
176 | static void resolve_query_disconnect(sd_resolve_query *q); | |
177 | ||
178 | #define RESOLVE_DONT_DESTROY(resolve) \ | |
4c89c718 | 179 | _cleanup_(sd_resolve_unrefp) _unused_ sd_resolve *_dont_destroy_##resolve = sd_resolve_ref(resolve) |
60f067b4 JS |
180 | |
181 | static int send_died(int out_fd) { | |
182 | ||
183 | RHeader rh = { | |
184 | .type = RESPONSE_DIED, | |
185 | .length = sizeof(RHeader), | |
186 | }; | |
187 | ||
188 | assert(out_fd >= 0); | |
189 | ||
190 | if (send(out_fd, &rh, rh.length, MSG_NOSIGNAL) < 0) | |
191 | return -errno; | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
196 | static void *serialize_addrinfo(void *p, const struct addrinfo *ai, size_t *length, size_t maxlength) { | |
197 | AddrInfoSerialization s; | |
198 | size_t cnl, l; | |
199 | ||
200 | assert(p); | |
201 | assert(ai); | |
202 | assert(length); | |
203 | assert(*length <= maxlength); | |
204 | ||
205 | cnl = ai->ai_canonname ? strlen(ai->ai_canonname)+1 : 0; | |
206 | l = sizeof(AddrInfoSerialization) + ai->ai_addrlen + cnl; | |
207 | ||
208 | if (*length + l > maxlength) | |
209 | return NULL; | |
210 | ||
211 | s.ai_flags = ai->ai_flags; | |
212 | s.ai_family = ai->ai_family; | |
213 | s.ai_socktype = ai->ai_socktype; | |
214 | s.ai_protocol = ai->ai_protocol; | |
215 | s.ai_addrlen = ai->ai_addrlen; | |
216 | s.canonname_len = cnl; | |
217 | ||
218 | memcpy((uint8_t*) p, &s, sizeof(AddrInfoSerialization)); | |
219 | memcpy((uint8_t*) p + sizeof(AddrInfoSerialization), ai->ai_addr, ai->ai_addrlen); | |
220 | ||
221 | if (ai->ai_canonname) | |
222 | memcpy((char*) p + sizeof(AddrInfoSerialization) + ai->ai_addrlen, ai->ai_canonname, cnl); | |
223 | ||
224 | *length += l; | |
225 | return (uint8_t*) p + l; | |
226 | } | |
227 | ||
228 | static int send_addrinfo_reply( | |
229 | int out_fd, | |
230 | unsigned id, | |
231 | int ret, | |
232 | struct addrinfo *ai, | |
233 | int _errno, | |
234 | int _h_errno) { | |
235 | ||
236 | AddrInfoResponse resp = { | |
237 | .header.type = RESPONSE_ADDRINFO, | |
238 | .header.id = id, | |
239 | .header.length = sizeof(AddrInfoResponse), | |
240 | .ret = ret, | |
241 | ._errno = _errno, | |
242 | ._h_errno = _h_errno, | |
243 | }; | |
244 | ||
245 | struct msghdr mh = {}; | |
246 | struct iovec iov[2]; | |
247 | union { | |
248 | AddrInfoSerialization ais; | |
249 | uint8_t space[BUFSIZE]; | |
250 | } buffer; | |
251 | ||
252 | assert(out_fd >= 0); | |
253 | ||
254 | if (ret == 0 && ai) { | |
255 | void *p = &buffer; | |
256 | struct addrinfo *k; | |
257 | ||
258 | for (k = ai; k; k = k->ai_next) { | |
259 | p = serialize_addrinfo(p, k, &resp.header.length, (uint8_t*) &buffer + BUFSIZE - (uint8_t*) p); | |
260 | if (!p) { | |
261 | freeaddrinfo(ai); | |
262 | return -ENOBUFS; | |
263 | } | |
264 | } | |
265 | } | |
266 | ||
267 | if (ai) | |
268 | freeaddrinfo(ai); | |
269 | ||
270 | iov[0] = (struct iovec) { .iov_base = &resp, .iov_len = sizeof(AddrInfoResponse) }; | |
271 | iov[1] = (struct iovec) { .iov_base = &buffer, .iov_len = resp.header.length - sizeof(AddrInfoResponse) }; | |
272 | ||
273 | mh.msg_iov = iov; | |
274 | mh.msg_iovlen = ELEMENTSOF(iov); | |
275 | ||
276 | if (sendmsg(out_fd, &mh, MSG_NOSIGNAL) < 0) | |
277 | return -errno; | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
282 | static int send_nameinfo_reply( | |
283 | int out_fd, | |
284 | unsigned id, | |
285 | int ret, | |
286 | const char *host, | |
287 | const char *serv, | |
288 | int _errno, | |
289 | int _h_errno) { | |
290 | ||
291 | NameInfoResponse resp = { | |
292 | .header.type = RESPONSE_NAMEINFO, | |
293 | .header.id = id, | |
294 | .ret = ret, | |
295 | ._errno = _errno, | |
296 | ._h_errno = _h_errno, | |
297 | }; | |
298 | ||
299 | struct msghdr mh = {}; | |
300 | struct iovec iov[3]; | |
301 | size_t hl, sl; | |
302 | ||
303 | assert(out_fd >= 0); | |
304 | ||
305 | sl = serv ? strlen(serv)+1 : 0; | |
306 | hl = host ? strlen(host)+1 : 0; | |
307 | ||
308 | resp.header.length = sizeof(NameInfoResponse) + hl + sl; | |
309 | resp.hostlen = hl; | |
310 | resp.servlen = sl; | |
311 | ||
312 | iov[0] = (struct iovec) { .iov_base = &resp, .iov_len = sizeof(NameInfoResponse) }; | |
313 | iov[1] = (struct iovec) { .iov_base = (void*) host, .iov_len = hl }; | |
314 | iov[2] = (struct iovec) { .iov_base = (void*) serv, .iov_len = sl }; | |
315 | ||
316 | mh.msg_iov = iov; | |
317 | mh.msg_iovlen = ELEMENTSOF(iov); | |
318 | ||
319 | if (sendmsg(out_fd, &mh, MSG_NOSIGNAL) < 0) | |
320 | return -errno; | |
321 | ||
322 | return 0; | |
323 | } | |
324 | ||
60f067b4 JS |
325 | static int handle_request(int out_fd, const Packet *packet, size_t length) { |
326 | const RHeader *req; | |
327 | ||
328 | assert(out_fd >= 0); | |
329 | assert(packet); | |
330 | ||
331 | req = &packet->rheader; | |
332 | ||
333 | assert(length >= sizeof(RHeader)); | |
334 | assert(length == req->length); | |
335 | ||
336 | switch (req->type) { | |
337 | ||
338 | case REQUEST_ADDRINFO: { | |
339 | const AddrInfoRequest *ai_req = &packet->addrinfo_request; | |
340 | struct addrinfo hints = {}, *result = NULL; | |
341 | const char *node, *service; | |
342 | int ret; | |
343 | ||
344 | assert(length >= sizeof(AddrInfoRequest)); | |
345 | assert(length == sizeof(AddrInfoRequest) + ai_req->node_len + ai_req->service_len); | |
346 | ||
347 | hints.ai_flags = ai_req->ai_flags; | |
348 | hints.ai_family = ai_req->ai_family; | |
349 | hints.ai_socktype = ai_req->ai_socktype; | |
350 | hints.ai_protocol = ai_req->ai_protocol; | |
351 | ||
352 | node = ai_req->node_len ? (const char*) ai_req + sizeof(AddrInfoRequest) : NULL; | |
353 | service = ai_req->service_len ? (const char*) ai_req + sizeof(AddrInfoRequest) + ai_req->node_len : NULL; | |
354 | ||
355 | ret = getaddrinfo( | |
356 | node, service, | |
357 | ai_req->hints_valid ? &hints : NULL, | |
358 | &result); | |
359 | ||
360 | /* send_addrinfo_reply() frees result */ | |
361 | return send_addrinfo_reply(out_fd, req->id, ret, result, errno, h_errno); | |
362 | } | |
363 | ||
364 | case REQUEST_NAMEINFO: { | |
365 | const NameInfoRequest *ni_req = &packet->nameinfo_request; | |
366 | char hostbuf[NI_MAXHOST], servbuf[NI_MAXSERV]; | |
367 | union sockaddr_union sa; | |
368 | int ret; | |
369 | ||
370 | assert(length >= sizeof(NameInfoRequest)); | |
371 | assert(length == sizeof(NameInfoRequest) + ni_req->sockaddr_len); | |
372 | assert(sizeof(sa) >= ni_req->sockaddr_len); | |
373 | ||
374 | memcpy(&sa, (const uint8_t *) ni_req + sizeof(NameInfoRequest), ni_req->sockaddr_len); | |
375 | ||
376 | ret = getnameinfo(&sa.sa, ni_req->sockaddr_len, | |
377 | ni_req->gethost ? hostbuf : NULL, ni_req->gethost ? sizeof(hostbuf) : 0, | |
378 | ni_req->getserv ? servbuf : NULL, ni_req->getserv ? sizeof(servbuf) : 0, | |
379 | ni_req->flags); | |
380 | ||
381 | return send_nameinfo_reply(out_fd, req->id, ret, | |
382 | ret == 0 && ni_req->gethost ? hostbuf : NULL, | |
383 | ret == 0 && ni_req->getserv ? servbuf : NULL, | |
384 | errno, h_errno); | |
385 | } | |
386 | ||
60f067b4 JS |
387 | case REQUEST_TERMINATE: |
388 | /* Quit */ | |
389 | return -ECONNRESET; | |
390 | ||
391 | default: | |
392 | assert_not_reached("Unknown request"); | |
393 | } | |
394 | ||
395 | return 0; | |
396 | } | |
397 | ||
398 | static void* thread_worker(void *p) { | |
399 | sd_resolve *resolve = p; | |
400 | sigset_t fullset; | |
401 | ||
402 | /* No signals in this thread please */ | |
403 | assert_se(sigfillset(&fullset) == 0); | |
404 | assert_se(pthread_sigmask(SIG_BLOCK, &fullset, NULL) == 0); | |
405 | ||
406 | /* Assign a pretty name to this thread */ | |
407 | prctl(PR_SET_NAME, (unsigned long) "sd-resolve"); | |
408 | ||
409 | while (!resolve->dead) { | |
410 | union { | |
411 | Packet packet; | |
412 | uint8_t space[BUFSIZE]; | |
413 | } buf; | |
414 | ssize_t length; | |
415 | ||
416 | length = recv(resolve->fds[REQUEST_RECV_FD], &buf, sizeof(buf), 0); | |
417 | if (length < 0) { | |
418 | if (errno == EINTR) | |
419 | continue; | |
420 | ||
421 | break; | |
422 | } | |
423 | if (length == 0) | |
424 | break; | |
425 | ||
426 | if (resolve->dead) | |
427 | break; | |
428 | ||
429 | if (handle_request(resolve->fds[RESPONSE_SEND_FD], &buf.packet, (size_t) length) < 0) | |
430 | break; | |
431 | } | |
432 | ||
433 | send_died(resolve->fds[RESPONSE_SEND_FD]); | |
434 | ||
435 | return NULL; | |
436 | } | |
437 | ||
438 | static int start_threads(sd_resolve *resolve, unsigned extra) { | |
439 | unsigned n; | |
440 | int r; | |
441 | ||
5eef597e | 442 | n = resolve->n_outstanding + extra; |
60f067b4 JS |
443 | n = CLAMP(n, WORKERS_MIN, WORKERS_MAX); |
444 | ||
445 | while (resolve->n_valid_workers < n) { | |
446 | ||
447 | r = pthread_create(&resolve->workers[resolve->n_valid_workers], NULL, thread_worker, resolve); | |
448 | if (r != 0) | |
449 | return -r; | |
450 | ||
451 | resolve->n_valid_workers ++; | |
452 | } | |
453 | ||
454 | return 0; | |
455 | } | |
456 | ||
457 | static bool resolve_pid_changed(sd_resolve *r) { | |
458 | assert(r); | |
459 | ||
460 | /* We don't support people creating a resolver and keeping it | |
461 | * around after fork(). Let's complain. */ | |
462 | ||
463 | return r->original_pid != getpid(); | |
464 | } | |
465 | ||
466 | _public_ int sd_resolve_new(sd_resolve **ret) { | |
467 | sd_resolve *resolve = NULL; | |
468 | int i, r; | |
469 | ||
470 | assert_return(ret, -EINVAL); | |
471 | ||
472 | resolve = new0(sd_resolve, 1); | |
473 | if (!resolve) | |
474 | return -ENOMEM; | |
475 | ||
476 | resolve->n_ref = 1; | |
477 | resolve->original_pid = getpid(); | |
478 | ||
479 | for (i = 0; i < _FD_MAX; i++) | |
480 | resolve->fds[i] = -1; | |
481 | ||
482 | r = socketpair(PF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, resolve->fds + REQUEST_RECV_FD); | |
483 | if (r < 0) { | |
484 | r = -errno; | |
485 | goto fail; | |
486 | } | |
487 | ||
488 | r = socketpair(PF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, resolve->fds + RESPONSE_RECV_FD); | |
489 | if (r < 0) { | |
490 | r = -errno; | |
491 | goto fail; | |
492 | } | |
493 | ||
494 | fd_inc_sndbuf(resolve->fds[REQUEST_SEND_FD], QUERIES_MAX * BUFSIZE); | |
495 | fd_inc_rcvbuf(resolve->fds[REQUEST_RECV_FD], QUERIES_MAX * BUFSIZE); | |
496 | fd_inc_sndbuf(resolve->fds[RESPONSE_SEND_FD], QUERIES_MAX * BUFSIZE); | |
497 | fd_inc_rcvbuf(resolve->fds[RESPONSE_RECV_FD], QUERIES_MAX * BUFSIZE); | |
498 | ||
499 | fd_nonblock(resolve->fds[RESPONSE_RECV_FD], true); | |
500 | ||
501 | *ret = resolve; | |
502 | return 0; | |
503 | ||
504 | fail: | |
505 | sd_resolve_unref(resolve); | |
506 | return r; | |
507 | } | |
508 | ||
509 | _public_ int sd_resolve_default(sd_resolve **ret) { | |
510 | ||
511 | static thread_local sd_resolve *default_resolve = NULL; | |
512 | sd_resolve *e = NULL; | |
513 | int r; | |
514 | ||
515 | if (!ret) | |
516 | return !!default_resolve; | |
517 | ||
518 | if (default_resolve) { | |
519 | *ret = sd_resolve_ref(default_resolve); | |
520 | return 0; | |
521 | } | |
522 | ||
523 | r = sd_resolve_new(&e); | |
524 | if (r < 0) | |
525 | return r; | |
526 | ||
527 | e->default_resolve_ptr = &default_resolve; | |
528 | e->tid = gettid(); | |
529 | default_resolve = e; | |
530 | ||
531 | *ret = e; | |
532 | return 1; | |
533 | } | |
534 | ||
535 | _public_ int sd_resolve_get_tid(sd_resolve *resolve, pid_t *tid) { | |
536 | assert_return(resolve, -EINVAL); | |
537 | assert_return(tid, -EINVAL); | |
538 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
539 | ||
540 | if (resolve->tid != 0) { | |
541 | *tid = resolve->tid; | |
542 | return 0; | |
543 | } | |
544 | ||
545 | if (resolve->event) | |
546 | return sd_event_get_tid(resolve->event, tid); | |
547 | ||
548 | return -ENXIO; | |
549 | } | |
550 | ||
551 | static void resolve_free(sd_resolve *resolve) { | |
552 | PROTECT_ERRNO; | |
553 | sd_resolve_query *q; | |
554 | unsigned i; | |
555 | ||
556 | assert(resolve); | |
557 | ||
558 | while ((q = resolve->queries)) { | |
559 | assert(q->floating); | |
560 | resolve_query_disconnect(q); | |
561 | sd_resolve_query_unref(q); | |
562 | } | |
563 | ||
564 | if (resolve->default_resolve_ptr) | |
565 | *(resolve->default_resolve_ptr) = NULL; | |
566 | ||
567 | resolve->dead = true; | |
568 | ||
569 | sd_resolve_detach_event(resolve); | |
570 | ||
571 | if (resolve->fds[REQUEST_SEND_FD] >= 0) { | |
572 | ||
573 | RHeader req = { | |
574 | .type = REQUEST_TERMINATE, | |
575 | .length = sizeof(req) | |
576 | }; | |
577 | ||
578 | /* Send one termination packet for each worker */ | |
579 | for (i = 0; i < resolve->n_valid_workers; i++) | |
e3bff60a | 580 | (void) send(resolve->fds[REQUEST_SEND_FD], &req, req.length, MSG_NOSIGNAL); |
60f067b4 JS |
581 | } |
582 | ||
583 | /* Now terminate them and wait until they are gone. */ | |
db2df898 MP |
584 | for (i = 0; i < resolve->n_valid_workers; i++) |
585 | pthread_join(resolve->workers[i], NULL); | |
60f067b4 JS |
586 | |
587 | /* Close all communication channels */ | |
588 | for (i = 0; i < _FD_MAX; i++) | |
589 | safe_close(resolve->fds[i]); | |
590 | ||
591 | free(resolve); | |
592 | } | |
593 | ||
594 | _public_ sd_resolve* sd_resolve_ref(sd_resolve *resolve) { | |
595 | assert_return(resolve, NULL); | |
596 | ||
597 | assert(resolve->n_ref >= 1); | |
598 | resolve->n_ref++; | |
599 | ||
600 | return resolve; | |
601 | } | |
602 | ||
603 | _public_ sd_resolve* sd_resolve_unref(sd_resolve *resolve) { | |
604 | ||
605 | if (!resolve) | |
606 | return NULL; | |
607 | ||
608 | assert(resolve->n_ref >= 1); | |
609 | resolve->n_ref--; | |
610 | ||
611 | if (resolve->n_ref <= 0) | |
612 | resolve_free(resolve); | |
613 | ||
614 | return NULL; | |
615 | } | |
616 | ||
617 | _public_ int sd_resolve_get_fd(sd_resolve *resolve) { | |
618 | assert_return(resolve, -EINVAL); | |
619 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
620 | ||
621 | return resolve->fds[RESPONSE_RECV_FD]; | |
622 | } | |
623 | ||
624 | _public_ int sd_resolve_get_events(sd_resolve *resolve) { | |
625 | assert_return(resolve, -EINVAL); | |
626 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
627 | ||
628 | return resolve->n_queries > resolve->n_done ? POLLIN : 0; | |
629 | } | |
630 | ||
631 | _public_ int sd_resolve_get_timeout(sd_resolve *resolve, uint64_t *usec) { | |
632 | assert_return(resolve, -EINVAL); | |
633 | assert_return(usec, -EINVAL); | |
634 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
635 | ||
636 | *usec = (uint64_t) -1; | |
637 | return 0; | |
638 | } | |
639 | ||
640 | static sd_resolve_query *lookup_query(sd_resolve *resolve, unsigned id) { | |
641 | sd_resolve_query *q; | |
642 | ||
643 | assert(resolve); | |
644 | ||
645 | q = resolve->query_array[id % QUERIES_MAX]; | |
646 | if (q) | |
647 | if (q->id == id) | |
648 | return q; | |
649 | ||
650 | return NULL; | |
651 | } | |
652 | ||
653 | static int complete_query(sd_resolve *resolve, sd_resolve_query *q) { | |
654 | int r; | |
655 | ||
656 | assert(q); | |
657 | assert(!q->done); | |
658 | assert(q->resolve == resolve); | |
659 | ||
660 | q->done = true; | |
661 | resolve->n_done ++; | |
662 | ||
663 | resolve->current = sd_resolve_query_ref(q); | |
664 | ||
665 | switch (q->type) { | |
666 | ||
667 | case REQUEST_ADDRINFO: | |
668 | r = getaddrinfo_done(q); | |
669 | break; | |
670 | ||
671 | case REQUEST_NAMEINFO: | |
672 | r = getnameinfo_done(q); | |
673 | break; | |
674 | ||
60f067b4 JS |
675 | default: |
676 | assert_not_reached("Cannot complete unknown query type"); | |
677 | } | |
678 | ||
5eef597e | 679 | resolve->current = NULL; |
60f067b4 JS |
680 | |
681 | if (q->floating) { | |
682 | resolve_query_disconnect(q); | |
683 | sd_resolve_query_unref(q); | |
684 | } | |
685 | ||
5eef597e MP |
686 | sd_resolve_query_unref(q); |
687 | ||
60f067b4 JS |
688 | return r; |
689 | } | |
690 | ||
691 | static int unserialize_addrinfo(const void **p, size_t *length, struct addrinfo **ret_ai) { | |
692 | AddrInfoSerialization s; | |
693 | size_t l; | |
694 | struct addrinfo *ai; | |
695 | ||
696 | assert(p); | |
697 | assert(*p); | |
698 | assert(ret_ai); | |
699 | assert(length); | |
700 | ||
701 | if (*length < sizeof(AddrInfoSerialization)) | |
702 | return -EBADMSG; | |
703 | ||
704 | memcpy(&s, *p, sizeof(s)); | |
705 | ||
706 | l = sizeof(AddrInfoSerialization) + s.ai_addrlen + s.canonname_len; | |
707 | if (*length < l) | |
708 | return -EBADMSG; | |
709 | ||
710 | ai = new0(struct addrinfo, 1); | |
711 | if (!ai) | |
712 | return -ENOMEM; | |
713 | ||
714 | ai->ai_flags = s.ai_flags; | |
715 | ai->ai_family = s.ai_family; | |
716 | ai->ai_socktype = s.ai_socktype; | |
717 | ai->ai_protocol = s.ai_protocol; | |
718 | ai->ai_addrlen = s.ai_addrlen; | |
719 | ||
720 | if (s.ai_addrlen > 0) { | |
721 | ai->ai_addr = memdup((const uint8_t*) *p + sizeof(AddrInfoSerialization), s.ai_addrlen); | |
722 | if (!ai->ai_addr) { | |
723 | free(ai); | |
724 | return -ENOMEM; | |
725 | } | |
726 | } | |
727 | ||
728 | if (s.canonname_len > 0) { | |
729 | ai->ai_canonname = memdup((const uint8_t*) *p + sizeof(AddrInfoSerialization) + s.ai_addrlen, s.canonname_len); | |
730 | if (!ai->ai_canonname) { | |
731 | free(ai->ai_addr); | |
732 | free(ai); | |
733 | return -ENOMEM; | |
734 | } | |
735 | } | |
736 | ||
737 | *length -= l; | |
738 | *ret_ai = ai; | |
739 | *p = ((const uint8_t*) *p) + l; | |
740 | ||
741 | return 0; | |
742 | } | |
743 | ||
744 | static int handle_response(sd_resolve *resolve, const Packet *packet, size_t length) { | |
745 | const RHeader *resp; | |
746 | sd_resolve_query *q; | |
747 | int r; | |
748 | ||
749 | assert(resolve); | |
750 | ||
751 | resp = &packet->rheader; | |
752 | assert(resp); | |
753 | assert(length >= sizeof(RHeader)); | |
754 | assert(length == resp->length); | |
755 | ||
756 | if (resp->type == RESPONSE_DIED) { | |
757 | resolve->dead = true; | |
758 | return 0; | |
759 | } | |
760 | ||
5eef597e MP |
761 | assert(resolve->n_outstanding > 0); |
762 | resolve->n_outstanding--; | |
763 | ||
60f067b4 JS |
764 | q = lookup_query(resolve, resp->id); |
765 | if (!q) | |
766 | return 0; | |
767 | ||
768 | switch (resp->type) { | |
769 | ||
770 | case RESPONSE_ADDRINFO: { | |
771 | const AddrInfoResponse *ai_resp = &packet->addrinfo_response; | |
772 | const void *p; | |
773 | size_t l; | |
774 | struct addrinfo *prev = NULL; | |
775 | ||
776 | assert(length >= sizeof(AddrInfoResponse)); | |
777 | assert(q->type == REQUEST_ADDRINFO); | |
778 | ||
779 | q->ret = ai_resp->ret; | |
780 | q->_errno = ai_resp->_errno; | |
781 | q->_h_errno = ai_resp->_h_errno; | |
782 | ||
783 | l = length - sizeof(AddrInfoResponse); | |
784 | p = (const uint8_t*) resp + sizeof(AddrInfoResponse); | |
785 | ||
786 | while (l > 0 && p) { | |
787 | struct addrinfo *ai = NULL; | |
788 | ||
789 | r = unserialize_addrinfo(&p, &l, &ai); | |
790 | if (r < 0) { | |
791 | q->ret = EAI_SYSTEM; | |
792 | q->_errno = -r; | |
793 | q->_h_errno = 0; | |
794 | freeaddrinfo(q->addrinfo); | |
795 | q->addrinfo = NULL; | |
796 | break; | |
797 | } | |
798 | ||
799 | if (prev) | |
800 | prev->ai_next = ai; | |
801 | else | |
802 | q->addrinfo = ai; | |
803 | ||
804 | prev = ai; | |
805 | } | |
806 | ||
807 | return complete_query(resolve, q); | |
808 | } | |
809 | ||
810 | case RESPONSE_NAMEINFO: { | |
811 | const NameInfoResponse *ni_resp = &packet->nameinfo_response; | |
812 | ||
813 | assert(length >= sizeof(NameInfoResponse)); | |
814 | assert(q->type == REQUEST_NAMEINFO); | |
815 | ||
816 | q->ret = ni_resp->ret; | |
817 | q->_errno = ni_resp->_errno; | |
818 | q->_h_errno = ni_resp->_h_errno; | |
819 | ||
820 | if (ni_resp->hostlen > 0) { | |
821 | q->host = strndup((const char*) ni_resp + sizeof(NameInfoResponse), ni_resp->hostlen-1); | |
822 | if (!q->host) { | |
823 | q->ret = EAI_MEMORY; | |
824 | q->_errno = ENOMEM; | |
825 | q->_h_errno = 0; | |
826 | } | |
827 | } | |
828 | ||
829 | if (ni_resp->servlen > 0) { | |
830 | q->serv = strndup((const char*) ni_resp + sizeof(NameInfoResponse) + ni_resp->hostlen, ni_resp->servlen-1); | |
831 | if (!q->serv) { | |
832 | q->ret = EAI_MEMORY; | |
833 | q->_errno = ENOMEM; | |
834 | q->_h_errno = 0; | |
835 | } | |
836 | } | |
837 | ||
838 | return complete_query(resolve, q); | |
839 | } | |
840 | ||
60f067b4 JS |
841 | default: |
842 | return 0; | |
843 | } | |
844 | } | |
845 | ||
846 | _public_ int sd_resolve_process(sd_resolve *resolve) { | |
847 | RESOLVE_DONT_DESTROY(resolve); | |
848 | ||
849 | union { | |
850 | Packet packet; | |
851 | uint8_t space[BUFSIZE]; | |
852 | } buf; | |
853 | ssize_t l; | |
854 | int r; | |
855 | ||
856 | assert_return(resolve, -EINVAL); | |
857 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
858 | ||
859 | /* We don't allow recursively invoking sd_resolve_process(). */ | |
860 | assert_return(!resolve->current, -EBUSY); | |
861 | ||
862 | l = recv(resolve->fds[RESPONSE_RECV_FD], &buf, sizeof(buf), 0); | |
863 | if (l < 0) { | |
864 | if (errno == EAGAIN) | |
865 | return 0; | |
866 | ||
867 | return -errno; | |
868 | } | |
869 | if (l == 0) | |
870 | return -ECONNREFUSED; | |
871 | ||
872 | r = handle_response(resolve, &buf.packet, (size_t) l); | |
873 | if (r < 0) | |
874 | return r; | |
875 | ||
876 | return 1; | |
877 | } | |
878 | ||
879 | _public_ int sd_resolve_wait(sd_resolve *resolve, uint64_t timeout_usec) { | |
880 | int r; | |
881 | ||
882 | assert_return(resolve, -EINVAL); | |
883 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
884 | ||
885 | if (resolve->n_done >= resolve->n_queries) | |
886 | return 0; | |
887 | ||
888 | do { | |
889 | r = fd_wait_for_event(resolve->fds[RESPONSE_RECV_FD], POLLIN, timeout_usec); | |
890 | } while (r == -EINTR); | |
891 | ||
892 | if (r < 0) | |
893 | return r; | |
894 | ||
895 | return sd_resolve_process(resolve); | |
896 | } | |
897 | ||
898 | static int alloc_query(sd_resolve *resolve, bool floating, sd_resolve_query **_q) { | |
899 | sd_resolve_query *q; | |
900 | int r; | |
901 | ||
902 | assert(resolve); | |
903 | assert(_q); | |
904 | ||
905 | if (resolve->n_queries >= QUERIES_MAX) | |
906 | return -ENOBUFS; | |
907 | ||
908 | r = start_threads(resolve, 1); | |
909 | if (r < 0) | |
910 | return r; | |
911 | ||
5eef597e | 912 | while (resolve->query_array[resolve->current_id % QUERIES_MAX]) |
60f067b4 JS |
913 | resolve->current_id++; |
914 | ||
5eef597e | 915 | q = resolve->query_array[resolve->current_id % QUERIES_MAX] = new0(sd_resolve_query, 1); |
60f067b4 JS |
916 | if (!q) |
917 | return -ENOMEM; | |
918 | ||
919 | q->n_ref = 1; | |
920 | q->resolve = resolve; | |
921 | q->floating = floating; | |
5eef597e | 922 | q->id = resolve->current_id++; |
60f067b4 JS |
923 | |
924 | if (!floating) | |
925 | sd_resolve_ref(resolve); | |
926 | ||
927 | LIST_PREPEND(queries, resolve->queries, q); | |
928 | resolve->n_queries++; | |
929 | ||
930 | *_q = q; | |
931 | return 0; | |
932 | } | |
933 | ||
934 | _public_ int sd_resolve_getaddrinfo( | |
935 | sd_resolve *resolve, | |
936 | sd_resolve_query **_q, | |
937 | const char *node, const char *service, | |
938 | const struct addrinfo *hints, | |
939 | sd_resolve_getaddrinfo_handler_t callback, void *userdata) { | |
940 | ||
941 | AddrInfoRequest req = {}; | |
942 | struct msghdr mh = {}; | |
943 | struct iovec iov[3]; | |
944 | sd_resolve_query *q; | |
945 | int r; | |
946 | ||
947 | assert_return(resolve, -EINVAL); | |
948 | assert_return(node || service, -EINVAL); | |
949 | assert_return(callback, -EINVAL); | |
950 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
951 | ||
952 | r = alloc_query(resolve, !_q, &q); | |
953 | if (r < 0) | |
954 | return r; | |
955 | ||
956 | q->type = REQUEST_ADDRINFO; | |
957 | q->getaddrinfo_handler = callback; | |
958 | q->userdata = userdata; | |
959 | ||
960 | req.node_len = node ? strlen(node)+1 : 0; | |
961 | req.service_len = service ? strlen(service)+1 : 0; | |
962 | ||
963 | req.header.id = q->id; | |
964 | req.header.type = REQUEST_ADDRINFO; | |
965 | req.header.length = sizeof(AddrInfoRequest) + req.node_len + req.service_len; | |
966 | ||
967 | if (hints) { | |
968 | req.hints_valid = true; | |
969 | req.ai_flags = hints->ai_flags; | |
970 | req.ai_family = hints->ai_family; | |
971 | req.ai_socktype = hints->ai_socktype; | |
972 | req.ai_protocol = hints->ai_protocol; | |
973 | } | |
974 | ||
975 | iov[mh.msg_iovlen++] = (struct iovec) { .iov_base = &req, .iov_len = sizeof(AddrInfoRequest) }; | |
976 | if (node) | |
977 | iov[mh.msg_iovlen++] = (struct iovec) { .iov_base = (void*) node, .iov_len = req.node_len }; | |
978 | if (service) | |
979 | iov[mh.msg_iovlen++] = (struct iovec) { .iov_base = (void*) service, .iov_len = req.service_len }; | |
980 | mh.msg_iov = iov; | |
981 | ||
982 | if (sendmsg(resolve->fds[REQUEST_SEND_FD], &mh, MSG_NOSIGNAL) < 0) { | |
983 | sd_resolve_query_unref(q); | |
984 | return -errno; | |
985 | } | |
986 | ||
5eef597e MP |
987 | resolve->n_outstanding++; |
988 | ||
60f067b4 JS |
989 | if (_q) |
990 | *_q = q; | |
991 | ||
992 | return 0; | |
993 | } | |
994 | ||
995 | static int getaddrinfo_done(sd_resolve_query* q) { | |
996 | assert(q); | |
997 | assert(q->done); | |
998 | assert(q->getaddrinfo_handler); | |
999 | ||
1000 | errno = q->_errno; | |
1001 | h_errno = q->_h_errno; | |
1002 | ||
1003 | return q->getaddrinfo_handler(q, q->ret, q->addrinfo, q->userdata); | |
1004 | } | |
1005 | ||
1006 | _public_ int sd_resolve_getnameinfo( | |
1007 | sd_resolve *resolve, | |
1008 | sd_resolve_query**_q, | |
1009 | const struct sockaddr *sa, socklen_t salen, | |
1010 | int flags, | |
1011 | uint64_t get, | |
1012 | sd_resolve_getnameinfo_handler_t callback, | |
1013 | void *userdata) { | |
1014 | ||
1015 | NameInfoRequest req = {}; | |
1016 | struct msghdr mh = {}; | |
1017 | struct iovec iov[2]; | |
1018 | sd_resolve_query *q; | |
1019 | int r; | |
1020 | ||
1021 | assert_return(resolve, -EINVAL); | |
1022 | assert_return(sa, -EINVAL); | |
1023 | assert_return(salen >= sizeof(struct sockaddr), -EINVAL); | |
1024 | assert_return(salen <= sizeof(union sockaddr_union), -EINVAL); | |
1025 | assert_return((get & ~SD_RESOLVE_GET_BOTH) == 0, -EINVAL); | |
1026 | assert_return(callback, -EINVAL); | |
1027 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
1028 | ||
1029 | r = alloc_query(resolve, !_q, &q); | |
1030 | if (r < 0) | |
1031 | return r; | |
1032 | ||
1033 | q->type = REQUEST_NAMEINFO; | |
1034 | q->getnameinfo_handler = callback; | |
1035 | q->userdata = userdata; | |
1036 | ||
1037 | req.header.id = q->id; | |
1038 | req.header.type = REQUEST_NAMEINFO; | |
1039 | req.header.length = sizeof(NameInfoRequest) + salen; | |
1040 | ||
1041 | req.flags = flags; | |
1042 | req.sockaddr_len = salen; | |
1043 | req.gethost = !!(get & SD_RESOLVE_GET_HOST); | |
1044 | req.getserv = !!(get & SD_RESOLVE_GET_SERVICE); | |
1045 | ||
1046 | iov[0] = (struct iovec) { .iov_base = &req, .iov_len = sizeof(NameInfoRequest) }; | |
1047 | iov[1] = (struct iovec) { .iov_base = (void*) sa, .iov_len = salen }; | |
1048 | ||
1049 | mh.msg_iov = iov; | |
1050 | mh.msg_iovlen = 2; | |
1051 | ||
1052 | if (sendmsg(resolve->fds[REQUEST_SEND_FD], &mh, MSG_NOSIGNAL) < 0) { | |
1053 | sd_resolve_query_unref(q); | |
1054 | return -errno; | |
1055 | } | |
1056 | ||
5eef597e MP |
1057 | resolve->n_outstanding++; |
1058 | ||
60f067b4 JS |
1059 | if (_q) |
1060 | *_q = q; | |
1061 | ||
1062 | return 0; | |
1063 | } | |
1064 | ||
1065 | static int getnameinfo_done(sd_resolve_query *q) { | |
1066 | ||
1067 | assert(q); | |
1068 | assert(q->done); | |
1069 | assert(q->getnameinfo_handler); | |
1070 | ||
1071 | errno = q->_errno; | |
1072 | h_errno= q->_h_errno; | |
1073 | ||
1074 | return q->getnameinfo_handler(q, q->ret, q->host, q->serv, q->userdata); | |
1075 | } | |
1076 | ||
60f067b4 JS |
1077 | _public_ sd_resolve_query* sd_resolve_query_ref(sd_resolve_query *q) { |
1078 | assert_return(q, NULL); | |
1079 | ||
1080 | assert(q->n_ref >= 1); | |
1081 | q->n_ref++; | |
1082 | ||
1083 | return q; | |
1084 | } | |
1085 | ||
1086 | static void resolve_freeaddrinfo(struct addrinfo *ai) { | |
1087 | while (ai) { | |
1088 | struct addrinfo *next = ai->ai_next; | |
1089 | ||
1090 | free(ai->ai_addr); | |
1091 | free(ai->ai_canonname); | |
1092 | free(ai); | |
1093 | ai = next; | |
1094 | } | |
1095 | } | |
1096 | ||
1097 | static void resolve_query_disconnect(sd_resolve_query *q) { | |
1098 | sd_resolve *resolve; | |
1099 | unsigned i; | |
1100 | ||
1101 | assert(q); | |
1102 | ||
1103 | if (!q->resolve) | |
1104 | return; | |
1105 | ||
1106 | resolve = q->resolve; | |
1107 | assert(resolve->n_queries > 0); | |
1108 | ||
1109 | if (q->done) { | |
1110 | assert(resolve->n_done > 0); | |
1111 | resolve->n_done--; | |
1112 | } | |
1113 | ||
1114 | i = q->id % QUERIES_MAX; | |
1115 | assert(resolve->query_array[i] == q); | |
1116 | resolve->query_array[i] = NULL; | |
1117 | LIST_REMOVE(queries, resolve->queries, q); | |
1118 | resolve->n_queries--; | |
1119 | ||
1120 | q->resolve = NULL; | |
1121 | if (!q->floating) | |
1122 | sd_resolve_unref(resolve); | |
1123 | } | |
1124 | ||
1125 | static void resolve_query_free(sd_resolve_query *q) { | |
1126 | assert(q); | |
1127 | ||
1128 | resolve_query_disconnect(q); | |
1129 | ||
1130 | resolve_freeaddrinfo(q->addrinfo); | |
1131 | free(q->host); | |
1132 | free(q->serv); | |
60f067b4 JS |
1133 | free(q); |
1134 | } | |
1135 | ||
1136 | _public_ sd_resolve_query* sd_resolve_query_unref(sd_resolve_query* q) { | |
1137 | if (!q) | |
1138 | return NULL; | |
1139 | ||
1140 | assert(q->n_ref >= 1); | |
1141 | q->n_ref--; | |
1142 | ||
1143 | if (q->n_ref <= 0) | |
1144 | resolve_query_free(q); | |
1145 | ||
1146 | return NULL; | |
1147 | } | |
1148 | ||
1149 | _public_ int sd_resolve_query_is_done(sd_resolve_query *q) { | |
1150 | assert_return(q, -EINVAL); | |
1151 | assert_return(!resolve_pid_changed(q->resolve), -ECHILD); | |
1152 | ||
1153 | return q->done; | |
1154 | } | |
1155 | ||
1156 | _public_ void* sd_resolve_query_set_userdata(sd_resolve_query *q, void *userdata) { | |
1157 | void *ret; | |
1158 | ||
1159 | assert_return(q, NULL); | |
1160 | assert_return(!resolve_pid_changed(q->resolve), NULL); | |
1161 | ||
1162 | ret = q->userdata; | |
1163 | q->userdata = userdata; | |
1164 | ||
1165 | return ret; | |
1166 | } | |
1167 | ||
1168 | _public_ void* sd_resolve_query_get_userdata(sd_resolve_query *q) { | |
1169 | assert_return(q, NULL); | |
1170 | assert_return(!resolve_pid_changed(q->resolve), NULL); | |
1171 | ||
1172 | return q->userdata; | |
1173 | } | |
1174 | ||
1175 | _public_ sd_resolve *sd_resolve_query_get_resolve(sd_resolve_query *q) { | |
1176 | assert_return(q, NULL); | |
1177 | assert_return(!resolve_pid_changed(q->resolve), NULL); | |
1178 | ||
1179 | return q->resolve; | |
1180 | } | |
1181 | ||
1182 | static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
1183 | sd_resolve *resolve = userdata; | |
1184 | int r; | |
1185 | ||
1186 | assert(resolve); | |
1187 | ||
1188 | r = sd_resolve_process(resolve); | |
1189 | if (r < 0) | |
1190 | return r; | |
1191 | ||
1192 | return 1; | |
1193 | } | |
1194 | ||
1195 | _public_ int sd_resolve_attach_event(sd_resolve *resolve, sd_event *event, int priority) { | |
1196 | int r; | |
1197 | ||
1198 | assert_return(resolve, -EINVAL); | |
1199 | assert_return(!resolve->event, -EBUSY); | |
1200 | ||
1201 | assert(!resolve->event_source); | |
1202 | ||
1203 | if (event) | |
1204 | resolve->event = sd_event_ref(event); | |
1205 | else { | |
1206 | r = sd_event_default(&resolve->event); | |
1207 | if (r < 0) | |
1208 | return r; | |
1209 | } | |
1210 | ||
1211 | r = sd_event_add_io(resolve->event, &resolve->event_source, resolve->fds[RESPONSE_RECV_FD], POLLIN, io_callback, resolve); | |
1212 | if (r < 0) | |
1213 | goto fail; | |
1214 | ||
1215 | r = sd_event_source_set_priority(resolve->event_source, priority); | |
1216 | if (r < 0) | |
1217 | goto fail; | |
1218 | ||
1219 | return 0; | |
1220 | ||
1221 | fail: | |
1222 | sd_resolve_detach_event(resolve); | |
1223 | return r; | |
1224 | } | |
1225 | ||
1226 | _public_ int sd_resolve_detach_event(sd_resolve *resolve) { | |
1227 | assert_return(resolve, -EINVAL); | |
1228 | ||
1229 | if (!resolve->event) | |
1230 | return 0; | |
1231 | ||
1232 | if (resolve->event_source) { | |
1233 | sd_event_source_set_enabled(resolve->event_source, SD_EVENT_OFF); | |
1234 | resolve->event_source = sd_event_source_unref(resolve->event_source); | |
1235 | } | |
1236 | ||
1237 | resolve->event = sd_event_unref(resolve->event); | |
1238 | return 1; | |
1239 | } | |
1240 | ||
1241 | _public_ sd_event *sd_resolve_get_event(sd_resolve *resolve) { | |
1242 | assert_return(resolve, NULL); | |
1243 | ||
1244 | return resolve->event; | |
1245 | } |