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ec2c5e43 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2014 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include "af-list.h" | |
23 | ||
24 | #include "resolved-dns-transaction.h" | |
25 | ||
26 | DnsTransaction* dns_transaction_free(DnsTransaction *t) { | |
27 | DnsQuery *q; | |
28 | DnsZoneItem *i; | |
29 | ||
30 | if (!t) | |
31 | return NULL; | |
32 | ||
33 | sd_event_source_unref(t->timeout_event_source); | |
34 | ||
35 | dns_question_unref(t->question); | |
36 | dns_packet_unref(t->sent); | |
37 | dns_packet_unref(t->received); | |
38 | dns_answer_unref(t->cached); | |
39 | ||
40 | dns_stream_free(t->stream); | |
41 | ||
42 | if (t->scope) { | |
43 | LIST_REMOVE(transactions_by_scope, t->scope->transactions, t); | |
44 | ||
45 | if (t->id != 0) | |
46 | hashmap_remove(t->scope->manager->dns_transactions, UINT_TO_PTR(t->id)); | |
47 | } | |
48 | ||
49 | while ((q = set_steal_first(t->queries))) | |
50 | set_remove(q->transactions, t); | |
51 | set_free(t->queries); | |
52 | ||
53 | while ((i = set_steal_first(t->zone_items))) | |
54 | i->probe_transaction = NULL; | |
55 | set_free(t->zone_items); | |
56 | ||
57 | free(t); | |
58 | return NULL; | |
59 | } | |
60 | ||
61 | DEFINE_TRIVIAL_CLEANUP_FUNC(DnsTransaction*, dns_transaction_free); | |
62 | ||
63 | void dns_transaction_gc(DnsTransaction *t) { | |
64 | assert(t); | |
65 | ||
66 | if (t->block_gc > 0) | |
67 | return; | |
68 | ||
69 | if (set_isempty(t->queries) && set_isempty(t->zone_items)) | |
70 | dns_transaction_free(t); | |
71 | } | |
72 | ||
73 | int dns_transaction_new(DnsTransaction **ret, DnsScope *s, DnsQuestion *q) { | |
74 | _cleanup_(dns_transaction_freep) DnsTransaction *t = NULL; | |
75 | int r; | |
76 | ||
77 | assert(ret); | |
78 | assert(s); | |
79 | assert(q); | |
80 | ||
81 | r = hashmap_ensure_allocated(&s->manager->dns_transactions, NULL, NULL); | |
82 | if (r < 0) | |
83 | return r; | |
84 | ||
85 | t = new0(DnsTransaction, 1); | |
86 | if (!t) | |
87 | return -ENOMEM; | |
88 | ||
89 | t->question = dns_question_ref(q); | |
90 | ||
91 | do | |
92 | random_bytes(&t->id, sizeof(t->id)); | |
93 | while (t->id == 0 || | |
94 | hashmap_get(s->manager->dns_transactions, UINT_TO_PTR(t->id))); | |
95 | ||
96 | r = hashmap_put(s->manager->dns_transactions, UINT_TO_PTR(t->id), t); | |
97 | if (r < 0) { | |
98 | t->id = 0; | |
99 | return r; | |
100 | } | |
101 | ||
102 | LIST_PREPEND(transactions_by_scope, s->transactions, t); | |
103 | t->scope = s; | |
104 | ||
105 | if (ret) | |
106 | *ret = t; | |
107 | ||
108 | t = NULL; | |
109 | ||
110 | return 0; | |
111 | } | |
112 | ||
113 | static void dns_transaction_stop(DnsTransaction *t) { | |
114 | assert(t); | |
115 | ||
116 | t->timeout_event_source = sd_event_source_unref(t->timeout_event_source); | |
117 | t->stream = dns_stream_free(t->stream); | |
118 | } | |
119 | ||
120 | static void dns_transaction_tentative(DnsTransaction *t, DnsPacket *p) { | |
121 | DnsZoneItem *z; | |
122 | Iterator i; | |
123 | ||
124 | assert(t); | |
125 | assert(p); | |
126 | ||
127 | if (manager_our_packet(t->scope->manager, p) != 0) | |
128 | return; | |
129 | ||
130 | log_debug("Transaction on scope %s on %s/%s got tentative packet", | |
131 | dns_protocol_to_string(t->scope->protocol), | |
132 | t->scope->link ? t->scope->link->name : "*", | |
133 | t->scope->family == AF_UNSPEC ? "*" : af_to_name(t->scope->family)); | |
134 | ||
a4076574 LP |
135 | /* RFC 4795, Section 4.1 says that the peer with the |
136 | * lexicographically smaller IP address loses */ | |
137 | if (memcmp(&p->sender, &p->destination, FAMILY_ADDRESS_SIZE(p->family)) < 0) { | |
138 | log_debug("Peer has lexicographically smaller IP address and thus lost in the conflict."); | |
139 | return; | |
140 | } | |
141 | ||
142 | log_debug("We have the lexicographically smaller IP address and thus lost in the conflict."); | |
143 | ||
ec2c5e43 LP |
144 | t->block_gc++; |
145 | SET_FOREACH(z, t->zone_items, i) | |
146 | dns_zone_item_conflict(z); | |
147 | t->block_gc--; | |
148 | ||
149 | dns_transaction_gc(t); | |
150 | } | |
151 | ||
152 | void dns_transaction_complete(DnsTransaction *t, DnsTransactionState state) { | |
153 | DnsQuery *q; | |
154 | DnsZoneItem *z; | |
155 | Iterator i; | |
156 | ||
157 | assert(t); | |
158 | assert(!IN_SET(state, DNS_TRANSACTION_NULL, DNS_TRANSACTION_PENDING)); | |
e56187ca LP |
159 | |
160 | if (!IN_SET(t->state, DNS_TRANSACTION_NULL, DNS_TRANSACTION_PENDING)) | |
161 | return; | |
ec2c5e43 LP |
162 | |
163 | /* Note that this call might invalidate the query. Callers | |
164 | * should hence not attempt to access the query or transaction | |
165 | * after calling this function. */ | |
166 | ||
167 | log_debug("Transaction on scope %s on %s/%s now complete with <%s>", | |
168 | dns_protocol_to_string(t->scope->protocol), | |
169 | t->scope->link ? t->scope->link->name : "*", | |
170 | t->scope->family == AF_UNSPEC ? "*" : af_to_name(t->scope->family), | |
171 | dns_transaction_state_to_string(state)); | |
172 | ||
173 | t->state = state; | |
174 | ||
175 | dns_transaction_stop(t); | |
176 | ||
177 | /* Notify all queries that are interested, but make sure the | |
178 | * transaction isn't freed while we are still looking at it */ | |
179 | t->block_gc++; | |
180 | SET_FOREACH(q, t->queries, i) | |
181 | dns_query_ready(q); | |
182 | SET_FOREACH(z, t->zone_items, i) | |
183 | dns_zone_item_ready(z); | |
184 | t->block_gc--; | |
185 | ||
186 | dns_transaction_gc(t); | |
187 | } | |
188 | ||
189 | static int on_stream_complete(DnsStream *s, int error) { | |
190 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; | |
191 | DnsTransaction *t; | |
192 | ||
193 | assert(s); | |
194 | assert(s->transaction); | |
195 | ||
196 | /* Copy the data we care about out of the stream before we | |
197 | * destroy it. */ | |
198 | t = s->transaction; | |
199 | p = dns_packet_ref(s->read_packet); | |
200 | ||
201 | t->stream = dns_stream_free(t->stream); | |
202 | ||
203 | if (error != 0) { | |
204 | dns_transaction_complete(t, DNS_TRANSACTION_RESOURCES); | |
205 | return 0; | |
206 | } | |
207 | ||
a4076574 LP |
208 | if (dns_packet_validate_reply(p) <= 0) { |
209 | log_debug("Invalid LLMNR TCP packet."); | |
210 | dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY); | |
211 | return 0; | |
212 | } | |
213 | ||
214 | dns_scope_check_conflicts(t->scope, p); | |
215 | ||
ec2c5e43 LP |
216 | t->block_gc++; |
217 | dns_transaction_process_reply(t, p); | |
218 | t->block_gc--; | |
219 | ||
220 | /* If the response wasn't useful, then complete the transition now */ | |
221 | if (t->state == DNS_TRANSACTION_PENDING) | |
222 | dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY); | |
223 | ||
224 | return 0; | |
225 | } | |
226 | ||
227 | static int dns_transaction_open_tcp(DnsTransaction *t) { | |
228 | _cleanup_close_ int fd = -1; | |
229 | int r; | |
230 | ||
231 | assert(t); | |
232 | ||
233 | if (t->stream) | |
234 | return 0; | |
235 | ||
236 | if (t->scope->protocol == DNS_PROTOCOL_DNS) | |
237 | fd = dns_scope_tcp_socket(t->scope, AF_UNSPEC, NULL, 53); | |
238 | else if (t->scope->protocol == DNS_PROTOCOL_LLMNR) { | |
239 | ||
240 | /* When we already received a query to this (but it was truncated), send to its sender address */ | |
241 | if (t->received) | |
242 | fd = dns_scope_tcp_socket(t->scope, t->received->family, &t->received->sender, t->received->sender_port); | |
243 | else { | |
244 | union in_addr_union address; | |
245 | int family; | |
246 | ||
247 | /* Otherwise, try to talk to the owner of a | |
248 | * the IP address, in case this is a reverse | |
249 | * PTR lookup */ | |
250 | r = dns_question_extract_reverse_address(t->question, &family, &address); | |
251 | if (r < 0) | |
252 | return r; | |
253 | if (r == 0) | |
254 | return -EINVAL; | |
255 | ||
256 | fd = dns_scope_tcp_socket(t->scope, family, &address, 5355); | |
257 | } | |
258 | } else | |
259 | return -EAFNOSUPPORT; | |
260 | ||
261 | if (fd < 0) | |
262 | return fd; | |
263 | ||
264 | r = dns_stream_new(t->scope->manager, &t->stream, t->scope->protocol, fd); | |
265 | if (r < 0) | |
266 | return r; | |
267 | ||
268 | fd = -1; | |
269 | ||
270 | r = dns_stream_write_packet(t->stream, t->sent); | |
271 | if (r < 0) { | |
272 | t->stream = dns_stream_free(t->stream); | |
273 | return r; | |
274 | } | |
275 | ||
276 | t->received = dns_packet_unref(t->received); | |
277 | t->stream->complete = on_stream_complete; | |
278 | t->stream->transaction = t; | |
279 | ||
280 | /* The interface index is difficult to determine if we are | |
281 | * connecting to the local host, hence fill this in right away | |
282 | * instead of determining it from the socket */ | |
283 | if (t->scope->link) | |
284 | t->stream->ifindex = t->scope->link->ifindex; | |
285 | ||
286 | return 0; | |
287 | } | |
288 | ||
289 | void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) { | |
290 | int r; | |
291 | ||
292 | assert(t); | |
293 | assert(p); | |
294 | assert(t->state == DNS_TRANSACTION_PENDING); | |
295 | ||
296 | /* Note that this call might invalidate the query. Callers | |
297 | * should hence not attempt to access the query or transaction | |
298 | * after calling this function. */ | |
299 | ||
300 | if (t->scope->protocol == DNS_PROTOCOL_LLMNR) { | |
301 | assert(t->scope->link); | |
302 | ||
303 | /* For LLMNR we will not accept any packets from other | |
304 | * interfaces */ | |
305 | ||
306 | if (p->ifindex != t->scope->link->ifindex) | |
307 | return; | |
308 | ||
309 | if (p->family != t->scope->family) | |
310 | return; | |
311 | ||
312 | /* Tentative packets are not full responses but still | |
313 | * useful for identifying uniqueness conflicts during | |
314 | * probing. */ | |
315 | if (DNS_PACKET_T(p)) { | |
316 | dns_transaction_tentative(t, p); | |
317 | return; | |
318 | } | |
319 | } | |
320 | ||
321 | if (t->scope->protocol == DNS_PROTOCOL_DNS) { | |
322 | ||
323 | /* For DNS we are fine with accepting packets on any | |
324 | * interface, but the source IP address must be one of | |
325 | * a valid DNS server */ | |
326 | ||
327 | if (!dns_scope_good_dns_server(t->scope, p->family, &p->sender)) | |
328 | return; | |
329 | ||
330 | if (p->sender_port != 53) | |
331 | return; | |
332 | } | |
333 | ||
334 | if (t->received != p) { | |
335 | dns_packet_unref(t->received); | |
336 | t->received = dns_packet_ref(p); | |
337 | } | |
338 | ||
339 | if (p->ipproto == IPPROTO_TCP) { | |
340 | if (DNS_PACKET_TC(p)) { | |
341 | /* Truncated via TCP? Somebody must be fucking with us */ | |
342 | dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY); | |
343 | return; | |
344 | } | |
345 | ||
346 | if (DNS_PACKET_ID(p) != t->id) { | |
347 | /* Not the reply to our query? Somebody must be fucking with us */ | |
348 | dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY); | |
349 | return; | |
350 | } | |
351 | } | |
352 | ||
353 | if (DNS_PACKET_TC(p)) { | |
354 | /* Response was truncated, let's try again with good old TCP */ | |
355 | r = dns_transaction_open_tcp(t); | |
356 | if (r == -ESRCH) { | |
357 | /* No servers found? Damn! */ | |
358 | dns_transaction_complete(t, DNS_TRANSACTION_NO_SERVERS); | |
359 | return; | |
360 | } | |
361 | if (r < 0) { | |
362 | /* On LLMNR, if we cannot connect to the host, | |
363 | * we immediately give up */ | |
364 | if (t->scope->protocol == DNS_PROTOCOL_LLMNR) { | |
365 | dns_transaction_complete(t, DNS_TRANSACTION_RESOURCES); | |
366 | return; | |
367 | } | |
368 | ||
369 | /* On DNS, couldn't send? Try immediately again, with a new server */ | |
370 | dns_scope_next_dns_server(t->scope); | |
371 | ||
372 | r = dns_transaction_go(t); | |
373 | if (r < 0) { | |
374 | dns_transaction_complete(t, DNS_TRANSACTION_RESOURCES); | |
375 | return; | |
376 | } | |
377 | ||
378 | return; | |
379 | } | |
380 | } | |
381 | ||
382 | /* Parse and update the cache */ | |
383 | r = dns_packet_extract(p); | |
384 | if (r < 0) { | |
385 | dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY); | |
386 | return; | |
387 | } | |
388 | ||
389 | /* According to RFC 4795, section 2.9. only the RRs from the answer section shall be cached */ | |
a4076574 | 390 | dns_cache_put(&t->scope->cache, p->question, DNS_PACKET_RCODE(p), p->answer, DNS_PACKET_ANCOUNT(p), 0, p->family, &p->sender); |
ec2c5e43 LP |
391 | |
392 | if (DNS_PACKET_RCODE(p) == DNS_RCODE_SUCCESS) | |
393 | dns_transaction_complete(t, DNS_TRANSACTION_SUCCESS); | |
394 | else | |
395 | dns_transaction_complete(t, DNS_TRANSACTION_FAILURE); | |
396 | } | |
397 | ||
398 | static int on_transaction_timeout(sd_event_source *s, usec_t usec, void *userdata) { | |
399 | DnsTransaction *t = userdata; | |
400 | int r; | |
401 | ||
402 | assert(s); | |
403 | assert(t); | |
404 | ||
405 | /* Timeout reached? Try again, with a new server */ | |
406 | dns_scope_next_dns_server(t->scope); | |
407 | ||
408 | r = dns_transaction_go(t); | |
409 | if (r < 0) | |
410 | dns_transaction_complete(t, DNS_TRANSACTION_RESOURCES); | |
411 | ||
412 | return 0; | |
413 | } | |
414 | ||
415 | static int dns_transaction_make_packet(DnsTransaction *t) { | |
416 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; | |
417 | unsigned n, added = 0; | |
418 | int r; | |
419 | ||
420 | assert(t); | |
421 | ||
422 | if (t->sent) | |
423 | return 0; | |
424 | ||
425 | r = dns_packet_new_query(&p, t->scope->protocol, 0); | |
426 | if (r < 0) | |
427 | return r; | |
428 | ||
429 | for (n = 0; n < t->question->n_keys; n++) { | |
430 | r = dns_scope_good_key(t->scope, t->question->keys[n]); | |
431 | if (r < 0) | |
432 | return r; | |
433 | if (r == 0) | |
434 | continue; | |
435 | ||
436 | r = dns_packet_append_key(p, t->question->keys[n], NULL); | |
437 | if (r < 0) | |
438 | return r; | |
439 | ||
440 | added++; | |
441 | } | |
442 | ||
443 | if (added <= 0) | |
444 | return -EDOM; | |
445 | ||
446 | DNS_PACKET_HEADER(p)->qdcount = htobe16(added); | |
447 | DNS_PACKET_HEADER(p)->id = t->id; | |
448 | ||
449 | t->sent = p; | |
450 | p = NULL; | |
451 | ||
452 | return 0; | |
453 | } | |
454 | ||
455 | int dns_transaction_go(DnsTransaction *t) { | |
456 | bool had_stream; | |
457 | int r; | |
458 | ||
459 | assert(t); | |
460 | ||
461 | had_stream = !!t->stream; | |
462 | ||
463 | dns_transaction_stop(t); | |
464 | ||
e56187ca | 465 | log_debug("Excercising transaction on scope %s on %s/%s", |
ec2c5e43 LP |
466 | dns_protocol_to_string(t->scope->protocol), |
467 | t->scope->link ? t->scope->link->name : "*", | |
468 | t->scope->family == AF_UNSPEC ? "*" : af_to_name(t->scope->family)); | |
469 | ||
470 | if (t->n_attempts >= TRANSACTION_ATTEMPTS_MAX(t->scope->protocol)) { | |
471 | dns_transaction_complete(t, DNS_TRANSACTION_ATTEMPTS_MAX_REACHED); | |
472 | return 0; | |
473 | } | |
474 | ||
475 | if (t->scope->protocol == DNS_PROTOCOL_LLMNR && had_stream) { | |
476 | /* If we already tried via a stream, then we don't | |
477 | * retry on LLMNR. See RFC 4795, Section 2.7. */ | |
478 | dns_transaction_complete(t, DNS_TRANSACTION_ATTEMPTS_MAX_REACHED); | |
479 | return 0; | |
480 | } | |
481 | ||
482 | t->n_attempts++; | |
483 | t->received = dns_packet_unref(t->received); | |
484 | t->cached = dns_answer_unref(t->cached); | |
485 | t->cached_rcode = 0; | |
486 | ||
4d926a69 LP |
487 | /* Check the cache, but only if this transaction is not used |
488 | * for probing or verifying a zone item. */ | |
489 | if (set_isempty(t->zone_items)) { | |
2c27fbca | 490 | |
4d926a69 LP |
491 | /* Before trying the cache, let's make sure we figured out a |
492 | * server to use. Should this cause a change of server this | |
493 | * might flush the cache. */ | |
494 | dns_scope_get_dns_server(t->scope); | |
2c27fbca | 495 | |
4d926a69 LP |
496 | /* Let's then prune all outdated entries */ |
497 | dns_cache_prune(&t->scope->cache); | |
498 | ||
499 | r = dns_cache_lookup(&t->scope->cache, t->question, &t->cached_rcode, &t->cached); | |
500 | if (r < 0) | |
501 | return r; | |
502 | if (r > 0) { | |
503 | log_debug("Cache hit!"); | |
504 | if (t->cached_rcode == DNS_RCODE_SUCCESS) | |
505 | dns_transaction_complete(t, DNS_TRANSACTION_SUCCESS); | |
506 | else | |
507 | dns_transaction_complete(t, DNS_TRANSACTION_FAILURE); | |
508 | return 0; | |
509 | } | |
ec2c5e43 LP |
510 | } |
511 | ||
6e068472 LP |
512 | if (t->scope->protocol == DNS_PROTOCOL_LLMNR && !t->initial_jitter) { |
513 | usec_t jitter; | |
514 | ||
515 | /* RFC 4795 Section 2.7 suggests all queries should be | |
516 | * delayed by a random time from 0 to JITTER_INTERVAL. */ | |
517 | ||
518 | t->initial_jitter = true; | |
519 | ||
520 | random_bytes(&jitter, sizeof(jitter)); | |
521 | jitter %= LLMNR_JITTER_INTERVAL_USEC; | |
522 | ||
523 | r = sd_event_add_time( | |
524 | t->scope->manager->event, | |
525 | &t->timeout_event_source, | |
526 | clock_boottime_or_monotonic(), | |
a4076574 LP |
527 | now(clock_boottime_or_monotonic()) + jitter, |
528 | LLMNR_JITTER_INTERVAL_USEC, | |
6e068472 LP |
529 | on_transaction_timeout, t); |
530 | if (r < 0) | |
531 | return r; | |
532 | ||
533 | t->n_attempts = 0; | |
534 | t->state = DNS_TRANSACTION_PENDING; | |
535 | ||
536 | log_debug("Delaying LLMNR transaction for " USEC_FMT "us.", jitter); | |
537 | return 0; | |
538 | } | |
539 | ||
2c27fbca LP |
540 | log_debug("Cache miss!"); |
541 | ||
ec2c5e43 LP |
542 | /* Otherwise, we need to ask the network */ |
543 | r = dns_transaction_make_packet(t); | |
544 | if (r == -EDOM) { | |
545 | /* Not the right request to make on this network? | |
546 | * (i.e. an A request made on IPv6 or an AAAA request | |
547 | * made on IPv4, on LLMNR or mDNS.) */ | |
548 | dns_transaction_complete(t, DNS_TRANSACTION_NO_SERVERS); | |
549 | return 0; | |
550 | } | |
551 | if (r < 0) | |
552 | return r; | |
553 | ||
554 | if (t->scope->protocol == DNS_PROTOCOL_LLMNR && | |
555 | (dns_question_endswith(t->question, "in-addr.arpa") > 0 || | |
556 | dns_question_endswith(t->question, "ip6.arpa") > 0)) { | |
557 | ||
558 | /* RFC 4795, Section 2.4. says reverse lookups shall | |
559 | * always be made via TCP on LLMNR */ | |
560 | r = dns_transaction_open_tcp(t); | |
561 | } else { | |
562 | /* Try via UDP, and if that fails due to large size try via TCP */ | |
a4076574 | 563 | r = dns_scope_emit(t->scope, t->sent); |
ec2c5e43 LP |
564 | if (r == -EMSGSIZE) |
565 | r = dns_transaction_open_tcp(t); | |
566 | } | |
567 | if (r == -ESRCH) { | |
568 | /* No servers to send this to? */ | |
569 | dns_transaction_complete(t, DNS_TRANSACTION_NO_SERVERS); | |
570 | return 0; | |
571 | } | |
572 | if (r < 0) { | |
13b551ac LP |
573 | if (t->scope->protocol != DNS_PROTOCOL_DNS) { |
574 | dns_transaction_complete(t, DNS_TRANSACTION_RESOURCES); | |
575 | return 0; | |
576 | } | |
577 | ||
ec2c5e43 LP |
578 | /* Couldn't send? Try immediately again, with a new server */ |
579 | dns_scope_next_dns_server(t->scope); | |
580 | ||
581 | return dns_transaction_go(t); | |
582 | } | |
583 | ||
9a015429 LP |
584 | r = sd_event_add_time( |
585 | t->scope->manager->event, | |
586 | &t->timeout_event_source, | |
587 | clock_boottime_or_monotonic(), | |
588 | now(clock_boottime_or_monotonic()) + TRANSACTION_TIMEOUT_USEC(t->scope->protocol), 0, | |
589 | on_transaction_timeout, t); | |
ec2c5e43 LP |
590 | if (r < 0) |
591 | return r; | |
592 | ||
593 | t->state = DNS_TRANSACTION_PENDING; | |
594 | return 1; | |
595 | } | |
596 | ||
597 | static const char* const dns_transaction_state_table[_DNS_TRANSACTION_STATE_MAX] = { | |
598 | [DNS_TRANSACTION_NULL] = "null", | |
599 | [DNS_TRANSACTION_PENDING] = "pending", | |
600 | [DNS_TRANSACTION_FAILURE] = "failure", | |
601 | [DNS_TRANSACTION_SUCCESS] = "success", | |
602 | [DNS_TRANSACTION_NO_SERVERS] = "no-servers", | |
603 | [DNS_TRANSACTION_TIMEOUT] = "timeout", | |
604 | [DNS_TRANSACTION_ATTEMPTS_MAX_REACHED] = "attempts-max-reached", | |
605 | [DNS_TRANSACTION_INVALID_REPLY] = "invalid-reply", | |
606 | [DNS_TRANSACTION_RESOURCES] = "resources", | |
607 | [DNS_TRANSACTION_ABORTED] = "aborted", | |
608 | }; | |
609 | DEFINE_STRING_TABLE_LOOKUP(dns_transaction_state, DnsTransactionState); |