]>
Commit | Line | Data |
---|---|---|
1 | /* SPDX-License-Identifier: LGPL-2.1+ */ | |
2 | ||
3 | #include <netinet/tcp.h> | |
4 | ||
5 | #include "alloc-util.h" | |
6 | #include "fd-util.h" | |
7 | #include "io-util.h" | |
8 | #include "missing.h" | |
9 | #include "resolved-dns-stream.h" | |
10 | ||
11 | #define DNS_STREAM_TIMEOUT_USEC (10 * USEC_PER_SEC) | |
12 | #define DNS_STREAMS_MAX 128 | |
13 | ||
14 | #define DNS_QUERIES_PER_STREAM 32 | |
15 | ||
16 | static void dns_stream_stop(DnsStream *s) { | |
17 | assert(s); | |
18 | ||
19 | s->io_event_source = sd_event_source_unref(s->io_event_source); | |
20 | s->timeout_event_source = sd_event_source_unref(s->timeout_event_source); | |
21 | s->fd = safe_close(s->fd); | |
22 | ||
23 | /* Disconnect us from the server object if we are now not usable anymore */ | |
24 | dns_stream_detach(s); | |
25 | } | |
26 | ||
27 | static int dns_stream_update_io(DnsStream *s) { | |
28 | int f = 0; | |
29 | ||
30 | assert(s); | |
31 | ||
32 | if (s->write_packet && s->n_written < sizeof(s->write_size) + s->write_packet->size) | |
33 | f |= EPOLLOUT; | |
34 | else if (!ordered_set_isempty(s->write_queue)) { | |
35 | dns_packet_unref(s->write_packet); | |
36 | s->write_packet = ordered_set_steal_first(s->write_queue); | |
37 | s->write_size = htobe16(s->write_packet->size); | |
38 | s->n_written = 0; | |
39 | f |= EPOLLOUT; | |
40 | } | |
41 | ||
42 | /* Let's read a packet if we haven't queued any yet. Except if we already hit a limit of parallel | |
43 | * queries for this connection. */ | |
44 | if ((!s->read_packet || s->n_read < sizeof(s->read_size) + s->read_packet->size) && | |
45 | set_size(s->queries) < DNS_QUERIES_PER_STREAM) | |
46 | f |= EPOLLIN; | |
47 | ||
48 | #if ENABLE_DNS_OVER_TLS | |
49 | /* For handshake and clean closing purposes, TLS can override requested events */ | |
50 | if (s->dnstls_events != 0) | |
51 | f = s->dnstls_events; | |
52 | #endif | |
53 | ||
54 | return sd_event_source_set_io_events(s->io_event_source, f); | |
55 | } | |
56 | ||
57 | static int dns_stream_complete(DnsStream *s, int error) { | |
58 | _cleanup_(dns_stream_unrefp) _unused_ DnsStream *ref = dns_stream_ref(s); /* Protect stream while we process it */ | |
59 | ||
60 | assert(s); | |
61 | assert(error >= 0); | |
62 | ||
63 | /* Error is > 0 when the connection failed for some reason in the network stack. It's == 0 if we sent | |
64 | * and received exactly one packet each (in the LLMNR client case). */ | |
65 | ||
66 | #if ENABLE_DNS_OVER_TLS | |
67 | if (s->encrypted) { | |
68 | int r; | |
69 | ||
70 | r = dnstls_stream_shutdown(s, error); | |
71 | if (r != -EAGAIN) | |
72 | dns_stream_stop(s); | |
73 | } else | |
74 | #endif | |
75 | dns_stream_stop(s); | |
76 | ||
77 | dns_stream_detach(s); | |
78 | ||
79 | if (s->complete) | |
80 | s->complete(s, error); | |
81 | else /* the default action if no completion function is set is to close the stream */ | |
82 | dns_stream_unref(s); | |
83 | ||
84 | return 0; | |
85 | } | |
86 | ||
87 | static int dns_stream_identify(DnsStream *s) { | |
88 | union { | |
89 | struct cmsghdr header; /* For alignment */ | |
90 | uint8_t buffer[CMSG_SPACE(MAXSIZE(struct in_pktinfo, struct in6_pktinfo)) | |
91 | + EXTRA_CMSG_SPACE /* kernel appears to require extra space */]; | |
92 | } control; | |
93 | struct msghdr mh = {}; | |
94 | struct cmsghdr *cmsg; | |
95 | socklen_t sl; | |
96 | int r; | |
97 | ||
98 | assert(s); | |
99 | ||
100 | if (s->identified) | |
101 | return 0; | |
102 | ||
103 | /* Query the local side */ | |
104 | s->local_salen = sizeof(s->local); | |
105 | r = getsockname(s->fd, &s->local.sa, &s->local_salen); | |
106 | if (r < 0) | |
107 | return -errno; | |
108 | if (s->local.sa.sa_family == AF_INET6 && s->ifindex <= 0) | |
109 | s->ifindex = s->local.in6.sin6_scope_id; | |
110 | ||
111 | /* Query the remote side */ | |
112 | s->peer_salen = sizeof(s->peer); | |
113 | r = getpeername(s->fd, &s->peer.sa, &s->peer_salen); | |
114 | if (r < 0) | |
115 | return -errno; | |
116 | if (s->peer.sa.sa_family == AF_INET6 && s->ifindex <= 0) | |
117 | s->ifindex = s->peer.in6.sin6_scope_id; | |
118 | ||
119 | /* Check consistency */ | |
120 | assert(s->peer.sa.sa_family == s->local.sa.sa_family); | |
121 | assert(IN_SET(s->peer.sa.sa_family, AF_INET, AF_INET6)); | |
122 | ||
123 | /* Query connection meta information */ | |
124 | sl = sizeof(control); | |
125 | if (s->peer.sa.sa_family == AF_INET) { | |
126 | r = getsockopt(s->fd, IPPROTO_IP, IP_PKTOPTIONS, &control, &sl); | |
127 | if (r < 0) | |
128 | return -errno; | |
129 | } else if (s->peer.sa.sa_family == AF_INET6) { | |
130 | ||
131 | r = getsockopt(s->fd, IPPROTO_IPV6, IPV6_2292PKTOPTIONS, &control, &sl); | |
132 | if (r < 0) | |
133 | return -errno; | |
134 | } else | |
135 | return -EAFNOSUPPORT; | |
136 | ||
137 | mh.msg_control = &control; | |
138 | mh.msg_controllen = sl; | |
139 | ||
140 | CMSG_FOREACH(cmsg, &mh) { | |
141 | ||
142 | if (cmsg->cmsg_level == IPPROTO_IPV6) { | |
143 | assert(s->peer.sa.sa_family == AF_INET6); | |
144 | ||
145 | switch (cmsg->cmsg_type) { | |
146 | ||
147 | case IPV6_PKTINFO: { | |
148 | struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg); | |
149 | ||
150 | if (s->ifindex <= 0) | |
151 | s->ifindex = i->ipi6_ifindex; | |
152 | break; | |
153 | } | |
154 | ||
155 | case IPV6_HOPLIMIT: | |
156 | s->ttl = *(int *) CMSG_DATA(cmsg); | |
157 | break; | |
158 | } | |
159 | ||
160 | } else if (cmsg->cmsg_level == IPPROTO_IP) { | |
161 | assert(s->peer.sa.sa_family == AF_INET); | |
162 | ||
163 | switch (cmsg->cmsg_type) { | |
164 | ||
165 | case IP_PKTINFO: { | |
166 | struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
167 | ||
168 | if (s->ifindex <= 0) | |
169 | s->ifindex = i->ipi_ifindex; | |
170 | break; | |
171 | } | |
172 | ||
173 | case IP_TTL: | |
174 | s->ttl = *(int *) CMSG_DATA(cmsg); | |
175 | break; | |
176 | } | |
177 | } | |
178 | } | |
179 | ||
180 | /* The Linux kernel sets the interface index to the loopback | |
181 | * device if the connection came from the local host since it | |
182 | * avoids the routing table in such a case. Let's unset the | |
183 | * interface index in such a case. */ | |
184 | if (s->ifindex == LOOPBACK_IFINDEX) | |
185 | s->ifindex = 0; | |
186 | ||
187 | /* If we don't know the interface index still, we look for the | |
188 | * first local interface with a matching address. Yuck! */ | |
189 | if (s->ifindex <= 0) | |
190 | s->ifindex = manager_find_ifindex(s->manager, s->local.sa.sa_family, s->local.sa.sa_family == AF_INET ? (union in_addr_union*) &s->local.in.sin_addr : (union in_addr_union*) &s->local.in6.sin6_addr); | |
191 | ||
192 | if (s->protocol == DNS_PROTOCOL_LLMNR && s->ifindex > 0) { | |
193 | uint32_t ifindex = htobe32(s->ifindex); | |
194 | ||
195 | /* Make sure all packets for this connection are sent on the same interface */ | |
196 | if (s->local.sa.sa_family == AF_INET) { | |
197 | r = setsockopt(s->fd, IPPROTO_IP, IP_UNICAST_IF, &ifindex, sizeof(ifindex)); | |
198 | if (r < 0) | |
199 | log_debug_errno(errno, "Failed to invoke IP_UNICAST_IF: %m"); | |
200 | } else if (s->local.sa.sa_family == AF_INET6) { | |
201 | r = setsockopt(s->fd, IPPROTO_IPV6, IPV6_UNICAST_IF, &ifindex, sizeof(ifindex)); | |
202 | if (r < 0) | |
203 | log_debug_errno(errno, "Failed to invoke IPV6_UNICAST_IF: %m"); | |
204 | } | |
205 | } | |
206 | ||
207 | s->identified = true; | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | ssize_t dns_stream_writev(DnsStream *s, const struct iovec *iov, size_t iovcnt, int flags) { | |
213 | ssize_t m; | |
214 | ||
215 | assert(s); | |
216 | assert(iov); | |
217 | ||
218 | #if ENABLE_DNS_OVER_TLS | |
219 | if (s->encrypted && !(flags & DNS_STREAM_WRITE_TLS_DATA)) { | |
220 | ssize_t ss; | |
221 | size_t i; | |
222 | ||
223 | m = 0; | |
224 | for (i = 0; i < iovcnt; i++) { | |
225 | ss = dnstls_stream_write(s, iov[i].iov_base, iov[i].iov_len); | |
226 | if (ss < 0) | |
227 | return ss; | |
228 | ||
229 | m += ss; | |
230 | if (ss != (ssize_t) iov[i].iov_len) | |
231 | continue; | |
232 | } | |
233 | } else | |
234 | #endif | |
235 | if (s->tfo_salen > 0) { | |
236 | struct msghdr hdr = { | |
237 | .msg_iov = (struct iovec*) iov, | |
238 | .msg_iovlen = iovcnt, | |
239 | .msg_name = &s->tfo_address.sa, | |
240 | .msg_namelen = s->tfo_salen | |
241 | }; | |
242 | ||
243 | m = sendmsg(s->fd, &hdr, MSG_FASTOPEN); | |
244 | if (m < 0) { | |
245 | if (errno == EOPNOTSUPP) { | |
246 | s->tfo_salen = 0; | |
247 | if (connect(s->fd, &s->tfo_address.sa, s->tfo_salen) < 0) | |
248 | return -errno; | |
249 | ||
250 | return -EAGAIN; | |
251 | } | |
252 | if (errno == EINPROGRESS) | |
253 | return -EAGAIN; | |
254 | ||
255 | return -errno; | |
256 | } else | |
257 | s->tfo_salen = 0; /* connection is made */ | |
258 | } else { | |
259 | m = writev(s->fd, iov, iovcnt); | |
260 | if (m < 0) | |
261 | return -errno; | |
262 | } | |
263 | ||
264 | return m; | |
265 | } | |
266 | ||
267 | static ssize_t dns_stream_read(DnsStream *s, void *buf, size_t count) { | |
268 | ssize_t ss; | |
269 | ||
270 | #if ENABLE_DNS_OVER_TLS | |
271 | if (s->encrypted) | |
272 | ss = dnstls_stream_read(s, buf, count); | |
273 | else | |
274 | #endif | |
275 | { | |
276 | ss = read(s->fd, buf, count); | |
277 | if (ss < 0) | |
278 | return -errno; | |
279 | } | |
280 | ||
281 | return ss; | |
282 | } | |
283 | ||
284 | static int on_stream_timeout(sd_event_source *es, usec_t usec, void *userdata) { | |
285 | DnsStream *s = userdata; | |
286 | ||
287 | assert(s); | |
288 | ||
289 | return dns_stream_complete(s, ETIMEDOUT); | |
290 | } | |
291 | ||
292 | static int on_stream_io(sd_event_source *es, int fd, uint32_t revents, void *userdata) { | |
293 | _cleanup_(dns_stream_unrefp) DnsStream *s = dns_stream_ref(userdata); /* Protect stream while we process it */ | |
294 | bool progressed = false; | |
295 | int r; | |
296 | ||
297 | assert(s); | |
298 | ||
299 | #if ENABLE_DNS_OVER_TLS | |
300 | if (s->encrypted) { | |
301 | r = dnstls_stream_on_io(s, revents); | |
302 | if (r == DNSTLS_STREAM_CLOSED) | |
303 | return 0; | |
304 | if (r == -EAGAIN) | |
305 | return dns_stream_update_io(s); | |
306 | if (r < 0) | |
307 | return dns_stream_complete(s, -r); | |
308 | ||
309 | r = dns_stream_update_io(s); | |
310 | if (r < 0) | |
311 | return r; | |
312 | } | |
313 | #endif | |
314 | ||
315 | /* only identify after connecting */ | |
316 | if (s->tfo_salen == 0) { | |
317 | r = dns_stream_identify(s); | |
318 | if (r < 0) | |
319 | return dns_stream_complete(s, -r); | |
320 | } | |
321 | ||
322 | if ((revents & EPOLLOUT) && | |
323 | s->write_packet && | |
324 | s->n_written < sizeof(s->write_size) + s->write_packet->size) { | |
325 | ||
326 | struct iovec iov[2]; | |
327 | ssize_t ss; | |
328 | ||
329 | iov[0] = IOVEC_MAKE(&s->write_size, sizeof(s->write_size)); | |
330 | iov[1] = IOVEC_MAKE(DNS_PACKET_DATA(s->write_packet), s->write_packet->size); | |
331 | ||
332 | IOVEC_INCREMENT(iov, 2, s->n_written); | |
333 | ||
334 | ss = dns_stream_writev(s, iov, 2, 0); | |
335 | if (ss < 0) { | |
336 | if (!IN_SET(-ss, EINTR, EAGAIN)) | |
337 | return dns_stream_complete(s, -ss); | |
338 | } else { | |
339 | progressed = true; | |
340 | s->n_written += ss; | |
341 | } | |
342 | ||
343 | /* Are we done? If so, disable the event source for EPOLLOUT */ | |
344 | if (s->n_written >= sizeof(s->write_size) + s->write_packet->size) { | |
345 | r = dns_stream_update_io(s); | |
346 | if (r < 0) | |
347 | return dns_stream_complete(s, -r); | |
348 | } | |
349 | } | |
350 | ||
351 | if ((revents & (EPOLLIN|EPOLLHUP|EPOLLRDHUP)) && | |
352 | (!s->read_packet || | |
353 | s->n_read < sizeof(s->read_size) + s->read_packet->size)) { | |
354 | ||
355 | if (s->n_read < sizeof(s->read_size)) { | |
356 | ssize_t ss; | |
357 | ||
358 | ss = dns_stream_read(s, (uint8_t*) &s->read_size + s->n_read, sizeof(s->read_size) - s->n_read); | |
359 | if (ss < 0) { | |
360 | if (!IN_SET(-ss, EINTR, EAGAIN)) | |
361 | return dns_stream_complete(s, -ss); | |
362 | } else if (ss == 0) | |
363 | return dns_stream_complete(s, ECONNRESET); | |
364 | else { | |
365 | progressed = true; | |
366 | s->n_read += ss; | |
367 | } | |
368 | } | |
369 | ||
370 | if (s->n_read >= sizeof(s->read_size)) { | |
371 | ||
372 | if (be16toh(s->read_size) < DNS_PACKET_HEADER_SIZE) | |
373 | return dns_stream_complete(s, EBADMSG); | |
374 | ||
375 | if (s->n_read < sizeof(s->read_size) + be16toh(s->read_size)) { | |
376 | ssize_t ss; | |
377 | ||
378 | if (!s->read_packet) { | |
379 | r = dns_packet_new(&s->read_packet, s->protocol, be16toh(s->read_size), DNS_PACKET_SIZE_MAX); | |
380 | if (r < 0) | |
381 | return dns_stream_complete(s, -r); | |
382 | ||
383 | s->read_packet->size = be16toh(s->read_size); | |
384 | s->read_packet->ipproto = IPPROTO_TCP; | |
385 | s->read_packet->family = s->peer.sa.sa_family; | |
386 | s->read_packet->ttl = s->ttl; | |
387 | s->read_packet->ifindex = s->ifindex; | |
388 | ||
389 | if (s->read_packet->family == AF_INET) { | |
390 | s->read_packet->sender.in = s->peer.in.sin_addr; | |
391 | s->read_packet->sender_port = be16toh(s->peer.in.sin_port); | |
392 | s->read_packet->destination.in = s->local.in.sin_addr; | |
393 | s->read_packet->destination_port = be16toh(s->local.in.sin_port); | |
394 | } else { | |
395 | assert(s->read_packet->family == AF_INET6); | |
396 | s->read_packet->sender.in6 = s->peer.in6.sin6_addr; | |
397 | s->read_packet->sender_port = be16toh(s->peer.in6.sin6_port); | |
398 | s->read_packet->destination.in6 = s->local.in6.sin6_addr; | |
399 | s->read_packet->destination_port = be16toh(s->local.in6.sin6_port); | |
400 | ||
401 | if (s->read_packet->ifindex == 0) | |
402 | s->read_packet->ifindex = s->peer.in6.sin6_scope_id; | |
403 | if (s->read_packet->ifindex == 0) | |
404 | s->read_packet->ifindex = s->local.in6.sin6_scope_id; | |
405 | } | |
406 | } | |
407 | ||
408 | ss = dns_stream_read(s, | |
409 | (uint8_t*) DNS_PACKET_DATA(s->read_packet) + s->n_read - sizeof(s->read_size), | |
410 | sizeof(s->read_size) + be16toh(s->read_size) - s->n_read); | |
411 | if (ss < 0) { | |
412 | if (!IN_SET(-ss, EINTR, EAGAIN)) | |
413 | return dns_stream_complete(s, -ss); | |
414 | } else if (ss == 0) | |
415 | return dns_stream_complete(s, ECONNRESET); | |
416 | else | |
417 | s->n_read += ss; | |
418 | } | |
419 | ||
420 | /* Are we done? If so, disable the event source for EPOLLIN */ | |
421 | if (s->n_read >= sizeof(s->read_size) + be16toh(s->read_size)) { | |
422 | /* If there's a packet handler | |
423 | * installed, call that. Note that | |
424 | * this is optional... */ | |
425 | if (s->on_packet) { | |
426 | r = s->on_packet(s); | |
427 | if (r < 0) | |
428 | return r; | |
429 | } | |
430 | ||
431 | r = dns_stream_update_io(s); | |
432 | if (r < 0) | |
433 | return dns_stream_complete(s, -r); | |
434 | } | |
435 | } | |
436 | } | |
437 | ||
438 | /* Call "complete" callback if finished reading and writing one packet, and there's nothing else left | |
439 | * to write. */ | |
440 | if (s->type == DNS_STREAM_LLMNR_SEND && | |
441 | (s->write_packet && s->n_written >= sizeof(s->write_size) + s->write_packet->size) && | |
442 | ordered_set_isempty(s->write_queue) && | |
443 | (s->read_packet && s->n_read >= sizeof(s->read_size) + s->read_packet->size)) | |
444 | return dns_stream_complete(s, 0); | |
445 | ||
446 | /* If we did something, let's restart the timeout event source */ | |
447 | if (progressed && s->timeout_event_source) { | |
448 | r = sd_event_source_set_time(s->timeout_event_source, now(clock_boottime_or_monotonic()) + DNS_STREAM_TIMEOUT_USEC); | |
449 | if (r < 0) | |
450 | log_warning_errno(errno, "Couldn't restart TCP connection timeout, ignoring: %m"); | |
451 | } | |
452 | ||
453 | return 0; | |
454 | } | |
455 | ||
456 | static DnsStream *dns_stream_free(DnsStream *s) { | |
457 | DnsPacket *p; | |
458 | Iterator i; | |
459 | ||
460 | assert(s); | |
461 | ||
462 | dns_stream_stop(s); | |
463 | ||
464 | if (s->manager) { | |
465 | LIST_REMOVE(streams, s->manager->dns_streams, s); | |
466 | s->manager->n_dns_streams[s->type]--; | |
467 | } | |
468 | ||
469 | #if ENABLE_DNS_OVER_TLS | |
470 | if (s->encrypted) | |
471 | dnstls_stream_free(s); | |
472 | #endif | |
473 | ||
474 | ORDERED_SET_FOREACH(p, s->write_queue, i) | |
475 | dns_packet_unref(ordered_set_remove(s->write_queue, p)); | |
476 | ||
477 | dns_packet_unref(s->write_packet); | |
478 | dns_packet_unref(s->read_packet); | |
479 | dns_server_unref(s->server); | |
480 | ||
481 | ordered_set_free(s->write_queue); | |
482 | ||
483 | return mfree(s); | |
484 | } | |
485 | ||
486 | DEFINE_TRIVIAL_REF_UNREF_FUNC(DnsStream, dns_stream, dns_stream_free); | |
487 | ||
488 | int dns_stream_new( | |
489 | Manager *m, | |
490 | DnsStream **ret, | |
491 | DnsStreamType type, | |
492 | DnsProtocol protocol, | |
493 | int fd, | |
494 | const union sockaddr_union *tfo_address) { | |
495 | ||
496 | _cleanup_(dns_stream_unrefp) DnsStream *s = NULL; | |
497 | int r; | |
498 | ||
499 | assert(m); | |
500 | assert(ret); | |
501 | assert(type >= 0); | |
502 | assert(type < _DNS_STREAM_TYPE_MAX); | |
503 | assert(protocol >= 0); | |
504 | assert(protocol < _DNS_PROTOCOL_MAX); | |
505 | assert(fd >= 0); | |
506 | ||
507 | if (m->n_dns_streams[type] > DNS_STREAMS_MAX) | |
508 | return -EBUSY; | |
509 | ||
510 | s = new(DnsStream, 1); | |
511 | if (!s) | |
512 | return -ENOMEM; | |
513 | ||
514 | *s = (DnsStream) { | |
515 | .n_ref = 1, | |
516 | .fd = -1, | |
517 | .protocol = protocol, | |
518 | .type = type, | |
519 | }; | |
520 | ||
521 | r = ordered_set_ensure_allocated(&s->write_queue, &dns_packet_hash_ops); | |
522 | if (r < 0) | |
523 | return r; | |
524 | ||
525 | r = sd_event_add_io(m->event, &s->io_event_source, fd, EPOLLIN, on_stream_io, s); | |
526 | if (r < 0) | |
527 | return r; | |
528 | ||
529 | (void) sd_event_source_set_description(s->io_event_source, "dns-stream-io"); | |
530 | ||
531 | r = sd_event_add_time( | |
532 | m->event, | |
533 | &s->timeout_event_source, | |
534 | clock_boottime_or_monotonic(), | |
535 | now(clock_boottime_or_monotonic()) + DNS_STREAM_TIMEOUT_USEC, 0, | |
536 | on_stream_timeout, s); | |
537 | if (r < 0) | |
538 | return r; | |
539 | ||
540 | (void) sd_event_source_set_description(s->timeout_event_source, "dns-stream-timeout"); | |
541 | ||
542 | LIST_PREPEND(streams, m->dns_streams, s); | |
543 | m->n_dns_streams[type]++; | |
544 | s->manager = m; | |
545 | ||
546 | s->fd = fd; | |
547 | ||
548 | if (tfo_address) { | |
549 | s->tfo_address = *tfo_address; | |
550 | s->tfo_salen = tfo_address->sa.sa_family == AF_INET6 ? sizeof(tfo_address->in6) : sizeof(tfo_address->in); | |
551 | } | |
552 | ||
553 | *ret = TAKE_PTR(s); | |
554 | ||
555 | return 0; | |
556 | } | |
557 | ||
558 | int dns_stream_write_packet(DnsStream *s, DnsPacket *p) { | |
559 | int r; | |
560 | ||
561 | assert(s); | |
562 | assert(p); | |
563 | ||
564 | r = ordered_set_put(s->write_queue, p); | |
565 | if (r < 0) | |
566 | return r; | |
567 | ||
568 | dns_packet_ref(p); | |
569 | ||
570 | return dns_stream_update_io(s); | |
571 | } | |
572 | ||
573 | DnsPacket *dns_stream_take_read_packet(DnsStream *s) { | |
574 | assert(s); | |
575 | ||
576 | if (!s->read_packet) | |
577 | return NULL; | |
578 | ||
579 | if (s->n_read < sizeof(s->read_size)) | |
580 | return NULL; | |
581 | ||
582 | if (s->n_read < sizeof(s->read_size) + be16toh(s->read_size)) | |
583 | return NULL; | |
584 | ||
585 | s->n_read = 0; | |
586 | return TAKE_PTR(s->read_packet); | |
587 | } | |
588 | ||
589 | void dns_stream_detach(DnsStream *s) { | |
590 | assert(s); | |
591 | ||
592 | if (!s->server) | |
593 | return; | |
594 | ||
595 | if (s->server->stream != s) | |
596 | return; | |
597 | ||
598 | dns_server_unref_stream(s->server); | |
599 | } |