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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
623a4c97 LP |
2 | |
3 | #include <netinet/tcp.h> | |
4 | ||
b5efdb8a | 5 | #include "alloc-util.h" |
3ffd4af2 | 6 | #include "fd-util.h" |
afc5dbf3 | 7 | #include "io-util.h" |
623a4c97 LP |
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 | static void dns_stream_stop(DnsStream *s) { | |
15 | assert(s); | |
16 | ||
17 | s->io_event_source = sd_event_source_unref(s->io_event_source); | |
18 | s->timeout_event_source = sd_event_source_unref(s->timeout_event_source); | |
19 | s->fd = safe_close(s->fd); | |
808089ae LP |
20 | |
21 | /* Disconnect us from the server object if we are now not usable anymore */ | |
22 | dns_stream_detach(s); | |
623a4c97 LP |
23 | } |
24 | ||
25 | static int dns_stream_update_io(DnsStream *s) { | |
26 | int f = 0; | |
27 | ||
28 | assert(s); | |
29 | ||
30 | if (s->write_packet && s->n_written < sizeof(s->write_size) + s->write_packet->size) | |
31 | f |= EPOLLOUT; | |
98767d75 IT |
32 | else if (!ordered_set_isempty(s->write_queue)) { |
33 | dns_packet_unref(s->write_packet); | |
34 | s->write_packet = ordered_set_steal_first(s->write_queue); | |
35 | s->write_size = htobe16(s->write_packet->size); | |
36 | s->n_written = 0; | |
37 | f |= EPOLLOUT; | |
38 | } | |
623a4c97 LP |
39 | if (!s->read_packet || s->n_read < sizeof(s->read_size) + s->read_packet->size) |
40 | f |= EPOLLIN; | |
41 | ||
ba6aaf57 IT |
42 | #if ENABLE_DNS_OVER_TLS |
43 | /* For handshake and clean closing purposes, TLS can override requested events */ | |
57bdb749 | 44 | if (s->dnstls_events != 0) |
ba6aaf57 IT |
45 | f = s->dnstls_events; |
46 | #endif | |
47 | ||
623a4c97 LP |
48 | return sd_event_source_set_io_events(s->io_event_source, f); |
49 | } | |
50 | ||
b914e211 | 51 | static int dns_stream_complete(DnsStream *s, int error) { |
d973d94d LP |
52 | _cleanup_(dns_stream_unrefp) _unused_ DnsStream *ref = dns_stream_ref(s); /* Protect stream while we process it */ |
53 | ||
623a4c97 LP |
54 | assert(s); |
55 | ||
56ddbf10 | 56 | #if ENABLE_DNS_OVER_TLS |
6016fcb0 | 57 | if (s->encrypted) { |
5d67a7ae IT |
58 | int r; |
59 | ||
6016fcb0 IT |
60 | r = dnstls_stream_shutdown(s, error); |
61 | if (r != -EAGAIN) | |
5d67a7ae IT |
62 | dns_stream_stop(s); |
63 | } else | |
64 | #endif | |
65 | dns_stream_stop(s); | |
623a4c97 | 66 | |
7172e4ee LP |
67 | dns_stream_detach(s); |
68 | ||
623a4c97 LP |
69 | if (s->complete) |
70 | s->complete(s, error); | |
b30bf55d LP |
71 | else /* the default action if no completion function is set is to close the stream */ |
72 | dns_stream_unref(s); | |
623a4c97 LP |
73 | |
74 | return 0; | |
75 | } | |
76 | ||
b914e211 LP |
77 | static int dns_stream_identify(DnsStream *s) { |
78 | union { | |
79 | struct cmsghdr header; /* For alignment */ | |
40a1eebd | 80 | uint8_t buffer[CMSG_SPACE(MAXSIZE(struct in_pktinfo, struct in6_pktinfo)) |
b914e211 LP |
81 | + EXTRA_CMSG_SPACE /* kernel appears to require extra space */]; |
82 | } control; | |
83 | struct msghdr mh = {}; | |
84 | struct cmsghdr *cmsg; | |
85 | socklen_t sl; | |
86 | int r; | |
87 | ||
88 | assert(s); | |
89 | ||
90 | if (s->identified) | |
91 | return 0; | |
92 | ||
93 | /* Query the local side */ | |
94 | s->local_salen = sizeof(s->local); | |
95 | r = getsockname(s->fd, &s->local.sa, &s->local_salen); | |
96 | if (r < 0) | |
97 | return -errno; | |
98 | if (s->local.sa.sa_family == AF_INET6 && s->ifindex <= 0) | |
99 | s->ifindex = s->local.in6.sin6_scope_id; | |
100 | ||
101 | /* Query the remote side */ | |
102 | s->peer_salen = sizeof(s->peer); | |
103 | r = getpeername(s->fd, &s->peer.sa, &s->peer_salen); | |
104 | if (r < 0) | |
105 | return -errno; | |
106 | if (s->peer.sa.sa_family == AF_INET6 && s->ifindex <= 0) | |
107 | s->ifindex = s->peer.in6.sin6_scope_id; | |
108 | ||
109 | /* Check consistency */ | |
110 | assert(s->peer.sa.sa_family == s->local.sa.sa_family); | |
111 | assert(IN_SET(s->peer.sa.sa_family, AF_INET, AF_INET6)); | |
112 | ||
113 | /* Query connection meta information */ | |
114 | sl = sizeof(control); | |
115 | if (s->peer.sa.sa_family == AF_INET) { | |
116 | r = getsockopt(s->fd, IPPROTO_IP, IP_PKTOPTIONS, &control, &sl); | |
117 | if (r < 0) | |
118 | return -errno; | |
119 | } else if (s->peer.sa.sa_family == AF_INET6) { | |
120 | ||
121 | r = getsockopt(s->fd, IPPROTO_IPV6, IPV6_2292PKTOPTIONS, &control, &sl); | |
122 | if (r < 0) | |
123 | return -errno; | |
124 | } else | |
125 | return -EAFNOSUPPORT; | |
126 | ||
127 | mh.msg_control = &control; | |
128 | mh.msg_controllen = sl; | |
2a1288ff LP |
129 | |
130 | CMSG_FOREACH(cmsg, &mh) { | |
b914e211 LP |
131 | |
132 | if (cmsg->cmsg_level == IPPROTO_IPV6) { | |
133 | assert(s->peer.sa.sa_family == AF_INET6); | |
134 | ||
135 | switch (cmsg->cmsg_type) { | |
136 | ||
137 | case IPV6_PKTINFO: { | |
138 | struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg); | |
139 | ||
140 | if (s->ifindex <= 0) | |
141 | s->ifindex = i->ipi6_ifindex; | |
142 | break; | |
143 | } | |
144 | ||
145 | case IPV6_HOPLIMIT: | |
146 | s->ttl = *(int *) CMSG_DATA(cmsg); | |
147 | break; | |
148 | } | |
149 | ||
150 | } else if (cmsg->cmsg_level == IPPROTO_IP) { | |
151 | assert(s->peer.sa.sa_family == AF_INET); | |
152 | ||
153 | switch (cmsg->cmsg_type) { | |
154 | ||
155 | case IP_PKTINFO: { | |
156 | struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
157 | ||
158 | if (s->ifindex <= 0) | |
159 | s->ifindex = i->ipi_ifindex; | |
160 | break; | |
161 | } | |
162 | ||
163 | case IP_TTL: | |
164 | s->ttl = *(int *) CMSG_DATA(cmsg); | |
165 | break; | |
166 | } | |
167 | } | |
168 | } | |
169 | ||
170 | /* The Linux kernel sets the interface index to the loopback | |
171 | * device if the connection came from the local host since it | |
172 | * avoids the routing table in such a case. Let's unset the | |
173 | * interface index in such a case. */ | |
a5f03596 | 174 | if (s->ifindex == LOOPBACK_IFINDEX) |
b914e211 LP |
175 | s->ifindex = 0; |
176 | ||
177 | /* If we don't know the interface index still, we look for the | |
178 | * first local interface with a matching address. Yuck! */ | |
179 | if (s->ifindex <= 0) | |
180 | 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); | |
181 | ||
182 | if (s->protocol == DNS_PROTOCOL_LLMNR && s->ifindex > 0) { | |
183 | uint32_t ifindex = htobe32(s->ifindex); | |
184 | ||
185 | /* Make sure all packets for this connection are sent on the same interface */ | |
186 | if (s->local.sa.sa_family == AF_INET) { | |
187 | r = setsockopt(s->fd, IPPROTO_IP, IP_UNICAST_IF, &ifindex, sizeof(ifindex)); | |
188 | if (r < 0) | |
56f64d95 | 189 | log_debug_errno(errno, "Failed to invoke IP_UNICAST_IF: %m"); |
b914e211 LP |
190 | } else if (s->local.sa.sa_family == AF_INET6) { |
191 | r = setsockopt(s->fd, IPPROTO_IPV6, IPV6_UNICAST_IF, &ifindex, sizeof(ifindex)); | |
192 | if (r < 0) | |
56f64d95 | 193 | log_debug_errno(errno, "Failed to invoke IPV6_UNICAST_IF: %m"); |
b914e211 LP |
194 | } |
195 | } | |
196 | ||
197 | s->identified = true; | |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
6016fcb0 | 202 | ssize_t dns_stream_writev(DnsStream *s, const struct iovec *iov, size_t iovcnt, int flags) { |
e6dc5556 | 203 | ssize_t m; |
91ccab1e IT |
204 | |
205 | assert(s); | |
206 | assert(iov); | |
207 | ||
56ddbf10 | 208 | #if ENABLE_DNS_OVER_TLS |
6016fcb0 | 209 | if (s->encrypted && !(flags & DNS_STREAM_WRITE_TLS_DATA)) { |
5d67a7ae IT |
210 | ssize_t ss; |
211 | size_t i; | |
212 | ||
e6dc5556 | 213 | m = 0; |
5d67a7ae | 214 | for (i = 0; i < iovcnt; i++) { |
6016fcb0 IT |
215 | ss = dnstls_stream_write(s, iov[i].iov_base, iov[i].iov_len); |
216 | if (ss < 0) | |
217 | return ss; | |
5d67a7ae | 218 | |
e6dc5556 | 219 | m += ss; |
5d67a7ae IT |
220 | if (ss != (ssize_t) iov[i].iov_len) |
221 | continue; | |
222 | } | |
223 | } else | |
224 | #endif | |
91ccab1e IT |
225 | if (s->tfo_salen > 0) { |
226 | struct msghdr hdr = { | |
227 | .msg_iov = (struct iovec*) iov, | |
228 | .msg_iovlen = iovcnt, | |
229 | .msg_name = &s->tfo_address.sa, | |
230 | .msg_namelen = s->tfo_salen | |
231 | }; | |
232 | ||
e6dc5556 LP |
233 | m = sendmsg(s->fd, &hdr, MSG_FASTOPEN); |
234 | if (m < 0) { | |
91ccab1e IT |
235 | if (errno == EOPNOTSUPP) { |
236 | s->tfo_salen = 0; | |
e6dc5556 | 237 | if (connect(s->fd, &s->tfo_address.sa, s->tfo_salen) < 0) |
91ccab1e IT |
238 | return -errno; |
239 | ||
e6dc5556 LP |
240 | return -EAGAIN; |
241 | } | |
242 | if (errno == EINPROGRESS) | |
243 | return -EAGAIN; | |
244 | ||
245 | return -errno; | |
91ccab1e IT |
246 | } else |
247 | s->tfo_salen = 0; /* connection is made */ | |
f6c9c5f8 | 248 | } else { |
e6dc5556 LP |
249 | m = writev(s->fd, iov, iovcnt); |
250 | if (m < 0) | |
251 | return -errno; | |
f6c9c5f8 | 252 | } |
91ccab1e | 253 | |
e6dc5556 | 254 | return m; |
91ccab1e IT |
255 | } |
256 | ||
5d67a7ae IT |
257 | static ssize_t dns_stream_read(DnsStream *s, void *buf, size_t count) { |
258 | ssize_t ss; | |
259 | ||
56ddbf10 | 260 | #if ENABLE_DNS_OVER_TLS |
6016fcb0 IT |
261 | if (s->encrypted) |
262 | ss = dnstls_stream_read(s, buf, count); | |
263 | else | |
5d67a7ae | 264 | #endif |
f6c9c5f8 | 265 | { |
5d67a7ae | 266 | ss = read(s->fd, buf, count); |
f6c9c5f8 | 267 | if (ss < 0) |
94fdb4d9 | 268 | return -errno; |
f6c9c5f8 | 269 | } |
5d67a7ae IT |
270 | |
271 | return ss; | |
272 | } | |
273 | ||
623a4c97 LP |
274 | static int on_stream_timeout(sd_event_source *es, usec_t usec, void *userdata) { |
275 | DnsStream *s = userdata; | |
276 | ||
277 | assert(s); | |
278 | ||
b914e211 | 279 | return dns_stream_complete(s, ETIMEDOUT); |
623a4c97 LP |
280 | } |
281 | ||
282 | static int on_stream_io(sd_event_source *es, int fd, uint32_t revents, void *userdata) { | |
d973d94d | 283 | _cleanup_(dns_stream_unrefp) DnsStream *s = dns_stream_ref(userdata); /* Protect stream while we process it */ |
5971dffd | 284 | bool progressed = false; |
623a4c97 LP |
285 | int r; |
286 | ||
287 | assert(s); | |
288 | ||
56ddbf10 | 289 | #if ENABLE_DNS_OVER_TLS |
6016fcb0 | 290 | if (s->encrypted) { |
04c4d919 | 291 | r = dnstls_stream_on_io(s, revents); |
ba6aaf57 | 292 | if (r == DNSTLS_STREAM_CLOSED) |
6016fcb0 | 293 | return 0; |
b2cf6704 | 294 | if (r == -EAGAIN) |
ba6aaf57 | 295 | return dns_stream_update_io(s); |
b2cf6704 | 296 | if (r < 0) |
6016fcb0 | 297 | return dns_stream_complete(s, -r); |
b2cf6704 LP |
298 | |
299 | r = dns_stream_update_io(s); | |
300 | if (r < 0) | |
301 | return r; | |
5d67a7ae IT |
302 | } |
303 | #endif | |
304 | ||
91ccab1e IT |
305 | /* only identify after connecting */ |
306 | if (s->tfo_salen == 0) { | |
307 | r = dns_stream_identify(s); | |
308 | if (r < 0) | |
309 | return dns_stream_complete(s, -r); | |
310 | } | |
b914e211 | 311 | |
623a4c97 LP |
312 | if ((revents & EPOLLOUT) && |
313 | s->write_packet && | |
314 | s->n_written < sizeof(s->write_size) + s->write_packet->size) { | |
315 | ||
316 | struct iovec iov[2]; | |
317 | ssize_t ss; | |
318 | ||
5cfa2c3d LP |
319 | iov[0] = IOVEC_MAKE(&s->write_size, sizeof(s->write_size)); |
320 | iov[1] = IOVEC_MAKE(DNS_PACKET_DATA(s->write_packet), s->write_packet->size); | |
623a4c97 LP |
321 | |
322 | IOVEC_INCREMENT(iov, 2, s->n_written); | |
323 | ||
5d67a7ae | 324 | ss = dns_stream_writev(s, iov, 2, 0); |
623a4c97 | 325 | if (ss < 0) { |
f6c9c5f8 IT |
326 | if (!IN_SET(-ss, EINTR, EAGAIN)) |
327 | return dns_stream_complete(s, -ss); | |
5971dffd LP |
328 | } else { |
329 | progressed = true; | |
623a4c97 | 330 | s->n_written += ss; |
5971dffd | 331 | } |
623a4c97 LP |
332 | |
333 | /* Are we done? If so, disable the event source for EPOLLOUT */ | |
334 | if (s->n_written >= sizeof(s->write_size) + s->write_packet->size) { | |
335 | r = dns_stream_update_io(s); | |
336 | if (r < 0) | |
b914e211 | 337 | return dns_stream_complete(s, -r); |
623a4c97 LP |
338 | } |
339 | } | |
340 | ||
341 | if ((revents & (EPOLLIN|EPOLLHUP|EPOLLRDHUP)) && | |
342 | (!s->read_packet || | |
343 | s->n_read < sizeof(s->read_size) + s->read_packet->size)) { | |
344 | ||
345 | if (s->n_read < sizeof(s->read_size)) { | |
346 | ssize_t ss; | |
347 | ||
5d67a7ae | 348 | ss = dns_stream_read(s, (uint8_t*) &s->read_size + s->n_read, sizeof(s->read_size) - s->n_read); |
623a4c97 | 349 | if (ss < 0) { |
f6c9c5f8 IT |
350 | if (!IN_SET(-ss, EINTR, EAGAIN)) |
351 | return dns_stream_complete(s, -ss); | |
623a4c97 | 352 | } else if (ss == 0) |
b914e211 | 353 | return dns_stream_complete(s, ECONNRESET); |
5971dffd LP |
354 | else { |
355 | progressed = true; | |
623a4c97 | 356 | s->n_read += ss; |
5971dffd | 357 | } |
623a4c97 LP |
358 | } |
359 | ||
360 | if (s->n_read >= sizeof(s->read_size)) { | |
361 | ||
362 | if (be16toh(s->read_size) < DNS_PACKET_HEADER_SIZE) | |
b914e211 | 363 | return dns_stream_complete(s, EBADMSG); |
623a4c97 LP |
364 | |
365 | if (s->n_read < sizeof(s->read_size) + be16toh(s->read_size)) { | |
366 | ssize_t ss; | |
367 | ||
368 | if (!s->read_packet) { | |
51027656 | 369 | r = dns_packet_new(&s->read_packet, s->protocol, be16toh(s->read_size), DNS_PACKET_SIZE_MAX); |
623a4c97 | 370 | if (r < 0) |
b914e211 | 371 | return dns_stream_complete(s, -r); |
623a4c97 LP |
372 | |
373 | s->read_packet->size = be16toh(s->read_size); | |
374 | s->read_packet->ipproto = IPPROTO_TCP; | |
375 | s->read_packet->family = s->peer.sa.sa_family; | |
376 | s->read_packet->ttl = s->ttl; | |
377 | s->read_packet->ifindex = s->ifindex; | |
378 | ||
379 | if (s->read_packet->family == AF_INET) { | |
380 | s->read_packet->sender.in = s->peer.in.sin_addr; | |
381 | s->read_packet->sender_port = be16toh(s->peer.in.sin_port); | |
382 | s->read_packet->destination.in = s->local.in.sin_addr; | |
383 | s->read_packet->destination_port = be16toh(s->local.in.sin_port); | |
384 | } else { | |
385 | assert(s->read_packet->family == AF_INET6); | |
386 | s->read_packet->sender.in6 = s->peer.in6.sin6_addr; | |
387 | s->read_packet->sender_port = be16toh(s->peer.in6.sin6_port); | |
388 | s->read_packet->destination.in6 = s->local.in6.sin6_addr; | |
389 | s->read_packet->destination_port = be16toh(s->local.in6.sin6_port); | |
390 | ||
391 | if (s->read_packet->ifindex == 0) | |
392 | s->read_packet->ifindex = s->peer.in6.sin6_scope_id; | |
393 | if (s->read_packet->ifindex == 0) | |
394 | s->read_packet->ifindex = s->local.in6.sin6_scope_id; | |
395 | } | |
396 | } | |
397 | ||
5d67a7ae | 398 | ss = dns_stream_read(s, |
623a4c97 LP |
399 | (uint8_t*) DNS_PACKET_DATA(s->read_packet) + s->n_read - sizeof(s->read_size), |
400 | sizeof(s->read_size) + be16toh(s->read_size) - s->n_read); | |
401 | if (ss < 0) { | |
99521cab YW |
402 | if (!IN_SET(-ss, EINTR, EAGAIN)) |
403 | return dns_stream_complete(s, -ss); | |
623a4c97 | 404 | } else if (ss == 0) |
b914e211 | 405 | return dns_stream_complete(s, ECONNRESET); |
623a4c97 LP |
406 | else |
407 | s->n_read += ss; | |
408 | } | |
409 | ||
410 | /* Are we done? If so, disable the event source for EPOLLIN */ | |
411 | if (s->n_read >= sizeof(s->read_size) + be16toh(s->read_size)) { | |
623a4c97 LP |
412 | /* If there's a packet handler |
413 | * installed, call that. Note that | |
414 | * this is optional... */ | |
98767d75 IT |
415 | if (s->on_packet) { |
416 | r = s->on_packet(s); | |
417 | if (r < 0) | |
418 | return r; | |
419 | } | |
420 | ||
421 | r = dns_stream_update_io(s); | |
422 | if (r < 0) | |
423 | return dns_stream_complete(s, -r); | |
623a4c97 LP |
424 | } |
425 | } | |
426 | } | |
427 | ||
428 | if ((s->write_packet && s->n_written >= sizeof(s->write_size) + s->write_packet->size) && | |
429 | (s->read_packet && s->n_read >= sizeof(s->read_size) + s->read_packet->size)) | |
b914e211 | 430 | return dns_stream_complete(s, 0); |
623a4c97 | 431 | |
5971dffd LP |
432 | /* If we did something, let's restart the timeout event source */ |
433 | if (progressed && s->timeout_event_source) { | |
434 | r = sd_event_source_set_time(s->timeout_event_source, now(clock_boottime_or_monotonic()) + DNS_STREAM_TIMEOUT_USEC); | |
435 | if (r < 0) | |
436 | log_warning_errno(errno, "Couldn't restart TCP connection timeout, ignoring: %m"); | |
437 | } | |
438 | ||
623a4c97 LP |
439 | return 0; |
440 | } | |
441 | ||
8301aa0b | 442 | static DnsStream *dns_stream_free(DnsStream *s) { |
98767d75 IT |
443 | DnsPacket *p; |
444 | Iterator i; | |
445 | ||
8301aa0b | 446 | assert(s); |
b30bf55d | 447 | |
623a4c97 LP |
448 | dns_stream_stop(s); |
449 | ||
450 | if (s->manager) { | |
451 | LIST_REMOVE(streams, s->manager->dns_streams, s); | |
652ba568 | 452 | s->manager->n_dns_streams[s->type]--; |
623a4c97 LP |
453 | } |
454 | ||
56ddbf10 | 455 | #if ENABLE_DNS_OVER_TLS |
6016fcb0 IT |
456 | if (s->encrypted) |
457 | dnstls_stream_free(s); | |
5d67a7ae IT |
458 | #endif |
459 | ||
98767d75 IT |
460 | ORDERED_SET_FOREACH(p, s->write_queue, i) |
461 | dns_packet_unref(ordered_set_remove(s->write_queue, p)); | |
462 | ||
623a4c97 LP |
463 | dns_packet_unref(s->write_packet); |
464 | dns_packet_unref(s->read_packet); | |
98767d75 IT |
465 | dns_server_unref(s->server); |
466 | ||
467 | ordered_set_free(s->write_queue); | |
623a4c97 | 468 | |
6b430fdb | 469 | return mfree(s); |
623a4c97 LP |
470 | } |
471 | ||
8301aa0b | 472 | DEFINE_TRIVIAL_REF_UNREF_FUNC(DnsStream, dns_stream, dns_stream_free); |
623a4c97 | 473 | |
b27a32a0 LP |
474 | int dns_stream_new( |
475 | Manager *m, | |
476 | DnsStream **ret, | |
652ba568 | 477 | DnsStreamType type, |
b27a32a0 LP |
478 | DnsProtocol protocol, |
479 | int fd, | |
480 | const union sockaddr_union *tfo_address) { | |
481 | ||
b30bf55d | 482 | _cleanup_(dns_stream_unrefp) DnsStream *s = NULL; |
623a4c97 LP |
483 | int r; |
484 | ||
485 | assert(m); | |
499aa1d3 | 486 | assert(ret); |
652ba568 LP |
487 | assert(type >= 0); |
488 | assert(type < _DNS_STREAM_TYPE_MAX); | |
489 | assert(protocol >= 0); | |
490 | assert(protocol < _DNS_PROTOCOL_MAX); | |
623a4c97 LP |
491 | assert(fd >= 0); |
492 | ||
652ba568 | 493 | if (m->n_dns_streams[type] > DNS_STREAMS_MAX) |
623a4c97 LP |
494 | return -EBUSY; |
495 | ||
898892e8 | 496 | s = new(DnsStream, 1); |
623a4c97 LP |
497 | if (!s) |
498 | return -ENOMEM; | |
499 | ||
898892e8 LP |
500 | *s = (DnsStream) { |
501 | .n_ref = 1, | |
502 | .fd = -1, | |
503 | .protocol = protocol, | |
504 | }; | |
505 | ||
98767d75 IT |
506 | r = ordered_set_ensure_allocated(&s->write_queue, &dns_packet_hash_ops); |
507 | if (r < 0) | |
508 | return r; | |
509 | ||
623a4c97 LP |
510 | r = sd_event_add_io(m->event, &s->io_event_source, fd, EPOLLIN, on_stream_io, s); |
511 | if (r < 0) | |
512 | return r; | |
513 | ||
aa4a9deb LP |
514 | (void) sd_event_source_set_description(s->io_event_source, "dns-stream-io"); |
515 | ||
9a015429 LP |
516 | r = sd_event_add_time( |
517 | m->event, | |
518 | &s->timeout_event_source, | |
519 | clock_boottime_or_monotonic(), | |
520 | now(clock_boottime_or_monotonic()) + DNS_STREAM_TIMEOUT_USEC, 0, | |
521 | on_stream_timeout, s); | |
623a4c97 LP |
522 | if (r < 0) |
523 | return r; | |
524 | ||
aa4a9deb LP |
525 | (void) sd_event_source_set_description(s->timeout_event_source, "dns-stream-timeout"); |
526 | ||
623a4c97 | 527 | LIST_PREPEND(streams, m->dns_streams, s); |
652ba568 | 528 | m->n_dns_streams[type]++; |
623a4c97 | 529 | s->manager = m; |
08e254c8 | 530 | |
623a4c97 | 531 | s->fd = fd; |
08e254c8 | 532 | |
91ccab1e IT |
533 | if (tfo_address) { |
534 | s->tfo_address = *tfo_address; | |
535 | s->tfo_salen = tfo_address->sa.sa_family == AF_INET6 ? sizeof(tfo_address->in6) : sizeof(tfo_address->in); | |
536 | } | |
537 | ||
1cc6c93a | 538 | *ret = TAKE_PTR(s); |
623a4c97 LP |
539 | |
540 | return 0; | |
541 | } | |
542 | ||
543 | int dns_stream_write_packet(DnsStream *s, DnsPacket *p) { | |
98767d75 IT |
544 | int r; |
545 | ||
623a4c97 | 546 | assert(s); |
499aa1d3 | 547 | assert(p); |
623a4c97 | 548 | |
98767d75 IT |
549 | r = ordered_set_put(s->write_queue, p); |
550 | if (r < 0) | |
551 | return r; | |
623a4c97 | 552 | |
98767d75 | 553 | dns_packet_ref(p); |
623a4c97 LP |
554 | |
555 | return dns_stream_update_io(s); | |
556 | } | |
aa337a5e LP |
557 | |
558 | DnsPacket *dns_stream_take_read_packet(DnsStream *s) { | |
559 | assert(s); | |
560 | ||
561 | if (!s->read_packet) | |
562 | return NULL; | |
563 | ||
564 | if (s->n_read < sizeof(s->read_size)) | |
565 | return NULL; | |
566 | ||
567 | if (s->n_read < sizeof(s->read_size) + be16toh(s->read_size)) | |
568 | return NULL; | |
569 | ||
570 | s->n_read = 0; | |
571 | return TAKE_PTR(s->read_packet); | |
572 | } | |
808089ae LP |
573 | |
574 | void dns_stream_detach(DnsStream *s) { | |
575 | assert(s); | |
576 | ||
577 | if (!s->server) | |
578 | return; | |
579 | ||
580 | if (s->server->stream != s) | |
581 | return; | |
582 | ||
583 | dns_server_unref_stream(s->server); | |
584 | } |