Mercurial > hg > nginx-quic
annotate src/core/ngx_resolver.c @ 1697:d6afb8723155
fix r1695
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Sat, 08 Dec 2007 22:12:37 +0000 |
parents | 0b592a68aade |
children | 0829024c924d |
rev | line source |
---|---|
583 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4 */ | |
5 | |
6 | |
7 #include <ngx_config.h> | |
8 #include <ngx_core.h> | |
9 #include <ngx_event.h> | |
10 | |
11 | |
1649 | 12 #define NGX_RESOLVER_UDP_SIZE 4096 |
13 | |
14 | |
583 | 15 typedef struct { |
1649 | 16 u_char ident_hi; |
17 u_char ident_lo; | |
18 u_char flags_hi; | |
19 u_char flags_lo; | |
20 u_char nqs_hi; | |
21 u_char nqs_lo; | |
22 u_char nan_hi; | |
23 u_char nan_lo; | |
24 u_char nns_hi; | |
25 u_char nns_lo; | |
26 u_char nar_hi; | |
27 u_char nar_lo; | |
28 } ngx_resolver_query_t; | |
29 | |
30 | |
31 typedef struct { | |
32 u_char type_hi; | |
33 u_char type_lo; | |
34 u_char class_hi; | |
35 u_char class_lo; | |
36 } ngx_resolver_qs_t; | |
37 | |
38 | |
39 typedef struct { | |
40 u_char type_hi; | |
41 u_char type_lo; | |
42 u_char class_hi; | |
43 u_char class_lo; | |
44 u_char ttl[4]; | |
45 u_char len_hi; | |
46 u_char len_lo; | |
47 } ngx_resolver_an_t; | |
48 | |
49 | |
50 ngx_int_t ngx_udp_connect(ngx_udp_connection_t *uc); | |
51 | |
52 | |
53 static ngx_int_t ngx_resolve_name_locked(ngx_resolver_t *r, | |
54 ngx_resolver_ctx_t *ctx); | |
55 static void ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
56 ngx_queue_t *queue); | |
57 static ngx_int_t ngx_resolver_send_query(ngx_resolver_t *r, | |
58 ngx_resolver_node_t *rn); | |
59 static ngx_int_t ngx_resolver_create_name_query(ngx_resolver_node_t *rn, | |
60 ngx_resolver_ctx_t *ctx); | |
61 static ngx_int_t ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, | |
62 ngx_resolver_ctx_t *ctx); | |
63 static void ngx_resolver_resend_handler(ngx_event_t *ev); | |
64 static time_t ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
65 ngx_queue_t *queue); | |
66 static void ngx_resolver_read_response(ngx_event_t *rev); | |
67 static void ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, | |
68 size_t n); | |
69 static void ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t n, | |
70 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t i); | |
71 static void ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, | |
72 ngx_uint_t ident, ngx_uint_t code); | |
73 static ngx_resolver_node_t *ngx_resolver_lookup_name(ngx_resolver_t *r, | |
74 ngx_str_t *name, uint32_t hash); | |
75 static ngx_resolver_node_t *ngx_resolver_lookup_addr(ngx_resolver_t *r, | |
76 in_addr_t addr); | |
77 static void ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
78 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel); | |
79 static ngx_int_t ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, | |
80 u_char *buf, u_char *src, u_char *last); | |
81 static void ngx_resolver_timeout_handler(ngx_event_t *ev); | |
82 static void ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn); | |
83 static void *ngx_resolver_alloc(ngx_resolver_t *r, size_t size); | |
84 static void ngx_resolver_free(ngx_resolver_t *r, void *p); | |
85 static void ngx_resolver_free_locked(ngx_resolver_t *r, void *p); | |
86 static void *ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size); | |
87 | |
88 | |
89 /* STUB: ngx_peer_addr_t * */ | |
90 | |
91 ngx_resolver_t * | |
92 ngx_resolver_create(ngx_peer_addr_t *addr, ngx_log_t *log) | |
93 { | |
94 ngx_resolver_t *r; | |
95 ngx_udp_connection_t *uc; | |
96 | |
97 r = ngx_calloc(sizeof(ngx_resolver_t), log); | |
98 if (r == NULL) { | |
99 return NULL; | |
100 } | |
101 | |
102 r->event = ngx_calloc(sizeof(ngx_event_t), log); | |
103 if (r->event == NULL) { | |
104 return NULL; | |
105 } | |
106 | |
1687 | 107 ngx_rbtree_init(&r->name_rbtree, &r->name_sentinel, |
108 ngx_resolver_rbtree_insert_value); | |
109 | |
110 ngx_rbtree_init(&r->addr_rbtree, &r->addr_sentinel, | |
111 ngx_rbtree_insert_value); | |
1649 | 112 |
1685 | 113 ngx_queue_init(&r->name_resend_queue); |
114 ngx_queue_init(&r->addr_resend_queue); | |
115 | |
116 ngx_queue_init(&r->name_expire_queue); | |
117 ngx_queue_init(&r->addr_expire_queue); | |
1649 | 118 |
119 r->event->handler = ngx_resolver_resend_handler; | |
120 r->event->data = r; | |
121 r->event->log = log; | |
122 r->ident = -1; | |
123 | |
124 r->resend_timeout = 5; | |
125 r->expire = 30; | |
126 r->valid = 300; | |
127 | |
128 r->log = log; | |
129 r->log_level = NGX_LOG_ALERT; | |
130 | |
1683
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
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131 if (addr) { |
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
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132 uc = ngx_calloc(sizeof(ngx_udp_connection_t), log); |
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
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133 if (uc == NULL) { |
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
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134 return NULL; |
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
|
135 } |
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
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136 |
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
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137 r->udp_connection = uc; |
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
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138 |
1e0b028055ec
allow to use IP addresses without defined resolver
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parents:
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139 uc->sockaddr = addr->sockaddr; |
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
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140 uc->socklen = addr->socklen; |
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
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141 uc->server = addr->name; |
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
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142 uc->log = log; |
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
|
143 } |
1649 | 144 |
145 return r; | |
146 } | |
147 | |
148 | |
149 ngx_resolver_ctx_t * | |
150 ngx_resolve_start(ngx_resolver_t *r, ngx_resolver_ctx_t *temp) | |
151 { | |
152 in_addr_t addr; | |
153 ngx_resolver_ctx_t *ctx; | |
154 | |
155 if (temp) { | |
156 addr = ngx_inet_addr(temp->name.data, temp->name.len); | |
157 | |
158 if (addr != INADDR_NONE) { | |
159 temp->resolver = r; | |
160 temp->state = NGX_OK; | |
161 temp->naddrs = 1; | |
162 temp->addrs = &temp->addr; | |
163 temp->addr = addr; | |
164 temp->quick = 1; | |
165 | |
166 return temp; | |
167 } | |
168 } | |
169 | |
1683
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
|
170 if (r->udp_connection == NULL) { |
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
|
171 return NGX_NO_RESOLVER; |
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
|
172 } |
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
|
173 |
1649 | 174 ctx = ngx_resolver_calloc(r, sizeof(ngx_resolver_ctx_t)); |
175 | |
176 if (ctx) { | |
177 ctx->resolver = r; | |
178 } | |
179 | |
180 return ctx; | |
181 } | |
182 | |
183 | |
184 ngx_int_t | |
185 ngx_resolve_name(ngx_resolver_ctx_t *ctx) | |
186 { | |
187 ngx_int_t rc; | |
188 ngx_resolver_t *r; | |
189 | |
190 r = ctx->resolver; | |
191 | |
192 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
193 "resolve: \"%V\"", &ctx->name); | |
194 | |
195 if (ctx->quick) { | |
196 ctx->handler(ctx); | |
197 return NGX_OK; | |
198 } | |
199 | |
200 /* lock name mutex */ | |
201 | |
202 rc = ngx_resolve_name_locked(r, ctx); | |
203 | |
204 if (rc == NGX_OK) { | |
205 return NGX_OK; | |
206 } | |
207 | |
208 /* unlock name mutex */ | |
209 | |
210 if (rc == NGX_AGAIN) { | |
211 return NGX_OK; | |
212 } | |
213 | |
214 /* lock alloc mutex */ | |
215 | |
216 if (ctx->event) { | |
217 ngx_resolver_free_locked(r, ctx->event); | |
218 } | |
219 | |
220 ngx_resolver_free_locked(r, ctx); | |
221 | |
222 /* unlock alloc mutex */ | |
223 | |
224 return NGX_ERROR; | |
225 } | |
226 | |
227 | |
228 void | |
229 ngx_resolve_name_done(ngx_resolver_ctx_t *ctx) | |
230 { | |
231 uint32_t hash; | |
232 ngx_resolver_t *r; | |
233 ngx_resolver_ctx_t *w, **p; | |
234 ngx_resolver_node_t *rn; | |
235 | |
236 r = ctx->resolver; | |
237 | |
238 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
239 "resolve name done: %i", ctx->state); | |
240 | |
241 if (ctx->quick) { | |
242 return; | |
243 } | |
244 | |
245 if (ctx->event && ctx->event->timer_set) { | |
246 ngx_del_timer(ctx->event); | |
247 } | |
248 | |
249 /* lock name mutex */ | |
250 | |
251 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
252 | |
253 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
254 | |
255 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
256 | |
257 if (rn) { | |
258 p = &rn->waiting; | |
259 w = rn->waiting; | |
260 | |
261 while (w) { | |
262 if (w == ctx) { | |
263 *p = w->next; | |
264 | |
265 goto done; | |
266 } | |
267 | |
268 p = &w->next; | |
269 w = w->next; | |
270 } | |
271 } | |
272 | |
273 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
274 "could not cancel %V resolving", &ctx->name); | |
275 } | |
276 | |
277 done: | |
278 | |
279 ngx_resolver_expire(r, &r->name_rbtree, &r->name_expire_queue); | |
280 | |
281 /* unlock name mutex */ | |
282 | |
283 ngx_resolver_free(r, ctx); | |
284 } | |
285 | |
286 | |
287 /* NGX_RESOLVE_A only */ | |
288 | |
289 static ngx_int_t | |
290 ngx_resolve_name_locked(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx) | |
291 { | |
292 uint32_t hash; | |
293 in_addr_t addr, *addrs; | |
294 ngx_uint_t naddrs; | |
295 ngx_resolver_ctx_t *next; | |
296 ngx_resolver_node_t *rn; | |
297 | |
298 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
299 | |
300 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
301 | |
302 if (rn) { | |
303 | |
304 if (rn->valid >= ngx_time()) { | |
305 | |
306 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
307 | |
308 ngx_queue_remove(&rn->queue); | |
309 | |
310 rn->expire = ngx_time() + r->expire; | |
311 | |
312 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
313 | |
314 naddrs = rn->naddrs; | |
315 | |
316 if (naddrs) { | |
317 | |
318 /* NGX_RESOLVE_A answer */ | |
319 | |
320 if (naddrs != 1) { | |
321 addr = 0; | |
322 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
323 naddrs * sizeof(in_addr_t)); | |
324 if (addrs == NULL) { | |
325 return NGX_ERROR; | |
326 } | |
327 | |
328 } else { | |
329 addr = rn->u.addr; | |
330 addrs = NULL; | |
331 } | |
332 | |
333 ctx->next = rn->waiting; | |
334 rn->waiting = NULL; | |
335 | |
336 /* unlock name mutex */ | |
337 | |
338 do { | |
339 ctx->state = NGX_OK; | |
340 ctx->naddrs = naddrs; | |
341 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
342 ctx->addr = addr; | |
343 next = ctx->next; | |
344 | |
345 ctx->handler(ctx); | |
346 | |
347 ctx = next; | |
348 } while (ctx); | |
349 | |
350 if (addrs) { | |
351 ngx_resolver_free(r, addrs); | |
352 } | |
353 | |
354 return NGX_OK; | |
355 } | |
356 | |
357 /* NGX_RESOLVE_CNAME */ | |
358 | |
359 ctx->name.len = rn->cnlen; | |
360 ctx->name.data = rn->u.cname; | |
361 | |
362 return ngx_resolve_name_locked(r, ctx); | |
363 } | |
364 | |
365 if (rn->waiting) { | |
366 | |
367 ctx->next = rn->waiting; | |
368 rn->waiting = ctx; | |
369 | |
370 return NGX_AGAIN; | |
371 } | |
372 | |
373 ngx_queue_remove(&rn->queue); | |
374 | |
375 /* lock alloc mutex */ | |
376 | |
377 ngx_resolver_free_locked(r, rn->query); | |
378 | |
379 if (rn->cnlen) { | |
380 ngx_resolver_free_locked(r, rn->u.cname); | |
381 } | |
382 | |
383 if (rn->naddrs > 1) { | |
384 ngx_resolver_free_locked(r, rn->u.addrs); | |
385 } | |
386 | |
387 /* unlock alloc mutex */ | |
388 | |
389 } else { | |
390 | |
391 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
392 if (rn == NULL) { | |
393 return NGX_ERROR; | |
394 } | |
395 | |
396 rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len); | |
397 if (rn->name == NULL) { | |
398 ngx_resolver_free(r, rn); | |
399 return NGX_ERROR; | |
400 } | |
401 | |
402 rn->node.key = hash; | |
403 rn->nlen = (u_short) ctx->name.len; | |
404 | |
405 ngx_rbtree_insert(&r->name_rbtree, &rn->node); | |
406 } | |
407 | |
408 if (ngx_resolver_create_name_query(rn, ctx) != NGX_OK) { | |
409 goto failed; | |
410 } | |
411 | |
412 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
413 goto failed; | |
414 } | |
415 | |
416 if (ctx->event == NULL) { | |
417 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
418 if (ctx->event == NULL) { | |
419 goto failed; | |
420 } | |
421 | |
422 ctx->event->handler = ngx_resolver_timeout_handler; | |
423 ctx->event->data = ctx; | |
424 ctx->event->log = r->log; | |
425 ctx->ident = -1; | |
426 | |
427 ngx_add_timer(ctx->event, ctx->timeout); | |
428 } | |
429 | |
430 if (ngx_queue_empty(&r->name_resend_queue)) { | |
431 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
432 } | |
433 | |
434 rn->expire = ngx_time() + r->resend_timeout; | |
435 | |
436 ngx_queue_insert_head(&r->name_resend_queue, &rn->queue); | |
437 | |
438 rn->cnlen = 0; | |
439 rn->naddrs = 0; | |
440 rn->valid = 0; | |
441 rn->waiting = ctx; | |
442 | |
443 ctx->state = NGX_AGAIN; | |
444 | |
445 return NGX_AGAIN; | |
446 | |
447 failed: | |
448 | |
449 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
450 | |
451 ngx_resolver_free(r, rn->name); | |
452 | |
453 ngx_resolver_free(r, rn); | |
454 | |
455 return NGX_ERROR; | |
456 } | |
583 | 457 |
458 | |
459 ngx_int_t | |
1649 | 460 ngx_resolve_addr(ngx_resolver_ctx_t *ctx) |
461 { | |
462 ngx_resolver_t *r; | |
463 ngx_resolver_node_t *rn; | |
464 | |
465 r = ctx->resolver; | |
466 | |
467 ctx->addr = ntohl(ctx->addr); | |
468 | |
469 /* lock addr mutex */ | |
470 | |
471 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
472 | |
473 if (rn) { | |
474 | |
475 if (rn->valid >= ngx_time()) { | |
476 | |
477 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
478 | |
479 ngx_queue_remove(&rn->queue); | |
480 | |
481 rn->expire = ngx_time() + r->expire; | |
482 | |
483 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
484 | |
485 ctx->name.len = rn->nlen; | |
486 ctx->name.data = ngx_resolver_dup(r, rn->name, rn->nlen); | |
487 if (ctx->name.data == NULL) { | |
488 goto failed; | |
489 } | |
490 | |
491 /* unlock addr mutex */ | |
492 | |
493 ctx->state = NGX_OK; | |
494 | |
495 ctx->handler(ctx); | |
496 | |
497 ngx_resolver_free(r, ctx->name.data); | |
498 | |
499 return NGX_OK; | |
500 } | |
501 | |
502 if (rn->waiting) { | |
503 | |
504 ctx->next = rn->waiting; | |
505 rn->waiting = ctx; | |
506 | |
507 return NGX_AGAIN; | |
508 } | |
509 | |
510 ngx_queue_remove(&rn->queue); | |
511 | |
512 ngx_resolver_free(r, rn->query); | |
513 | |
514 } else { | |
515 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
516 if (rn == NULL) { | |
517 goto failed; | |
518 } | |
519 | |
520 rn->node.key = ctx->addr; | |
521 | |
522 ngx_rbtree_insert(&r->addr_rbtree, &rn->node); | |
523 } | |
524 | |
525 if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) { | |
526 goto failed; | |
527 } | |
528 | |
529 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
530 goto failed; | |
531 } | |
532 | |
533 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
534 if (ctx->event == NULL) { | |
535 goto failed; | |
536 } | |
537 | |
538 ctx->event->handler = ngx_resolver_timeout_handler; | |
539 ctx->event->data = ctx; | |
540 ctx->event->log = r->log; | |
541 ctx->ident = -1; | |
542 | |
543 ngx_add_timer(ctx->event, ctx->timeout); | |
544 | |
545 if (ngx_queue_empty(&r->addr_resend_queue)) { | |
546 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
547 } | |
548 | |
549 rn->expire = ngx_time() + r->resend_timeout; | |
550 | |
551 ngx_queue_insert_head(&r->addr_resend_queue, &rn->queue); | |
552 | |
553 rn->cnlen = 0; | |
554 rn->naddrs = 0; | |
555 rn->name = NULL; | |
556 rn->nlen = 0; | |
557 rn->valid = 0; | |
558 rn->waiting = ctx; | |
559 | |
560 /* unlock addr mutex */ | |
561 | |
562 ctx->state = NGX_AGAIN; | |
563 | |
564 return NGX_OK; | |
565 | |
566 failed: | |
567 | |
568 if (rn) { | |
569 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
570 | |
571 ngx_resolver_free(r, rn); | |
572 } | |
573 | |
574 /* unlock addr mutex */ | |
575 | |
576 /* lock alloc mutex */ | |
577 | |
578 if (ctx->event) { | |
579 ngx_resolver_free_locked(r, ctx->event); | |
580 } | |
581 | |
582 ngx_resolver_free_locked(r, ctx); | |
583 | |
584 /* unlock alloc mutex */ | |
585 | |
586 return NGX_ERROR; | |
587 } | |
588 | |
589 | |
590 void | |
591 ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx) | |
592 { | |
593 in_addr_t addr; | |
594 ngx_resolver_t *r; | |
595 ngx_resolver_ctx_t *w, **p; | |
596 ngx_resolver_node_t *rn; | |
597 | |
598 r = ctx->resolver; | |
599 | |
600 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
601 "resolve addr done: %i", ctx->state); | |
602 | |
603 if (ctx->event && ctx->event->timer_set) { | |
604 ngx_del_timer(ctx->event); | |
605 } | |
606 | |
607 /* lock addr mutex */ | |
608 | |
609 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
610 | |
611 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
612 | |
613 if (rn) { | |
614 p = &rn->waiting; | |
615 w = rn->waiting; | |
616 | |
617 while (w) { | |
618 if (w == ctx) { | |
619 *p = w->next; | |
620 | |
621 goto done; | |
622 } | |
623 | |
624 p = &w->next; | |
625 w = w->next; | |
626 } | |
627 } | |
628 | |
629 addr = ntohl(ctx->addr); | |
630 | |
631 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
632 "could not cancel %ud.%ud.%ud.%ud resolving", | |
633 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
634 (addr >> 8) & 0xff, addr & 0xff); | |
635 } | |
636 | |
637 done: | |
638 | |
639 ngx_resolver_expire(r, &r->addr_rbtree, &r->addr_expire_queue); | |
640 | |
641 /* unlock addr mutex */ | |
642 | |
643 ngx_resolver_free(r, ctx); | |
644 } | |
645 | |
646 | |
647 static void | |
648 ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
649 { | |
650 time_t now; | |
651 ngx_uint_t i; | |
652 ngx_queue_t *q; | |
653 ngx_resolver_node_t *rn; | |
654 | |
655 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire"); | |
656 | |
657 now = ngx_time(); | |
658 | |
659 for (i = 0; i < 2; i++) { | |
660 if (ngx_queue_empty(queue)) { | |
661 return; | |
662 } | |
663 | |
664 q = ngx_queue_last(queue); | |
665 | |
666 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
667 | |
668 if (now <= rn->expire) { | |
669 return; | |
670 } | |
671 | |
672 #if (NGX_DEBUG) | |
673 { | |
674 ngx_str_t s; | |
675 | |
676 s.len = rn->nlen; | |
677 s.data = rn->name; | |
678 | |
679 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
680 "resolver expire \"%V\"", &s); | |
681 } | |
682 #endif | |
683 | |
684 ngx_queue_remove(q); | |
685 | |
686 ngx_rbtree_delete(tree, &rn->node); | |
687 | |
688 ngx_resolver_free_node(r, rn); | |
689 } | |
690 } | |
691 | |
692 | |
693 static ngx_int_t | |
694 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
695 { | |
696 ssize_t n; | |
697 ngx_udp_connection_t *uc; | |
698 | |
699 uc = r->udp_connection; | |
700 | |
701 if (uc->connection == NULL) { | |
702 if (ngx_udp_connect(uc) != NGX_OK) { | |
703 return NGX_ERROR; | |
704 } | |
705 | |
706 uc->connection->data = r; | |
707 uc->connection->read->handler = ngx_resolver_read_response; | |
708 } | |
709 | |
710 n = ngx_send(uc->connection, rn->query, rn->qlen); | |
711 | |
712 if (n == -1) { | |
713 return NGX_ERROR; | |
714 } | |
715 | |
716 if ((size_t) n != (size_t) rn->qlen) { | |
717 ngx_log_error(NGX_LOG_CRIT, uc->log, 0, "send() incomplete"); | |
718 return NGX_ERROR; | |
719 } | |
720 | |
721 return NGX_OK; | |
722 } | |
723 | |
724 | |
725 static void | |
726 ngx_resolver_resend_handler(ngx_event_t *ev) | |
727 { | |
728 time_t timer, atimer, ntimer; | |
729 ngx_resolver_t *r; | |
730 | |
731 r = ev->data; | |
732 | |
733 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, | |
734 "resolver resend handler"); | |
735 | |
736 /* lock name mutex */ | |
737 | |
738 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue); | |
739 | |
740 /* unlock name mutex */ | |
741 | |
742 /* lock addr mutex */ | |
743 | |
744 atimer = ngx_resolver_resend(r, &r->addr_rbtree, &r->addr_resend_queue); | |
1679
ca317d9b5c09
style fix: remove trailing spaces
Igor Sysoev <igor@sysoev.ru>
parents:
1649
diff
changeset
|
745 |
1649 | 746 /* unlock addr mutex */ |
747 | |
748 if (ntimer == 0) { | |
749 timer = atimer; | |
750 | |
751 } else if (atimer == 0) { | |
752 timer = ntimer; | |
753 | |
754 } else { | |
755 timer = (atimer < ntimer) ? atimer : ntimer; | |
756 } | |
757 | |
758 if (timer) { | |
759 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000)); | |
760 } | |
761 } | |
762 | |
763 | |
764 static time_t | |
765 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
766 { | |
767 time_t now; | |
768 ngx_queue_t *q; | |
769 ngx_resolver_node_t *rn; | |
770 | |
771 now = ngx_time(); | |
772 | |
773 for ( ;; ) { | |
774 if (ngx_queue_empty(queue)) { | |
775 return 0; | |
776 } | |
777 | |
778 q = ngx_queue_last(queue); | |
779 | |
780 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
781 | |
782 if (now < rn->expire) { | |
783 return rn->expire - now; | |
784 } | |
785 | |
786 #if (NGX_DEBUG) | |
787 { | |
788 ngx_str_t s; | |
789 | |
790 s.len = rn->nlen; | |
791 s.data = rn->name; | |
792 | |
793 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
794 "resolver resend \"%V\" %p", &s, rn->waiting); | |
795 } | |
796 #endif | |
797 | |
798 ngx_queue_remove(q); | |
799 | |
800 if (rn->waiting) { | |
801 | |
802 if (ngx_resolver_send_query(r, rn) == NGX_OK) { | |
803 | |
804 rn->expire = now + r->resend_timeout; | |
805 | |
806 ngx_queue_insert_head(queue, &rn->queue); | |
807 | |
808 continue; | |
809 } | |
810 } | |
811 | |
812 ngx_rbtree_delete(tree, &rn->node); | |
813 | |
814 ngx_resolver_free_node(r, rn); | |
815 } | |
816 } | |
817 | |
818 | |
819 static void | |
820 ngx_resolver_read_response(ngx_event_t *rev) | |
821 { | |
822 ssize_t n; | |
823 ngx_connection_t *c; | |
824 u_char buf[NGX_RESOLVER_UDP_SIZE]; | |
825 | |
826 c = rev->data; | |
827 | |
828 do { | |
1689 | 829 n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE); |
830 | |
831 if (n < 0) { | |
1649 | 832 return; |
833 } | |
834 | |
835 ngx_resolver_process_response(c->data, buf, n); | |
836 | |
837 } while (rev->ready); | |
838 } | |
839 | |
840 | |
841 static void | |
842 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n) | |
843 { | |
844 char *err; | |
845 size_t len; | |
846 ngx_uint_t i, ident, flags, code, nqs, nan, qtype, qclass; | |
847 ngx_resolver_qs_t *qs; | |
848 ngx_resolver_query_t *query; | |
849 | |
850 if ((size_t) n < sizeof(ngx_resolver_query_t) + 1) { | |
851 goto short_response; | |
852 } | |
853 | |
854 query = (ngx_resolver_query_t *) buf; | |
855 | |
856 ident = (query->ident_hi << 8) + query->ident_lo; | |
857 flags = (query->flags_hi << 8) + query->flags_lo; | |
858 nqs = (query->nqs_hi << 8) + query->nqs_lo; | |
859 nan = (query->nan_hi << 8) + query->nan_lo; | |
860 | |
861 ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0, | |
862 "resolver DNS response %d fl:%04Xud %d/%d/%d/%d", | |
863 ident, flags, nqs, nan, | |
864 (query->nns_hi << 8) + query->nns_lo, | |
865 (query->nar_hi << 8) + query->nar_lo); | |
866 | |
867 if (!(flags & 0x8000)) { | |
868 ngx_log_error(r->log_level, r->log, 0, | |
869 "invalid DNS response %d fl:%04Xud", ident, flags); | |
870 return; | |
871 } | |
872 | |
873 code = flags & 0x7f; | |
874 | |
875 if (code == NGX_RESOLVE_FORMERR || code > NGX_RESOLVE_REFUSED) { | |
876 ngx_log_error(r->log_level, r->log, 0, | |
877 "DNS error (%d: %s), query id:%d", | |
878 code, ngx_resolver_strerror(code), ident); | |
879 return; | |
880 } | |
881 | |
882 if (nqs != 1) { | |
883 err = "invalid number of questions in DNS response"; | |
884 goto done; | |
885 } | |
886 | |
887 if (code == 0 && nan == 0) { | |
888 err = "no answers in DNS response"; | |
889 goto done; | |
890 } | |
891 | |
892 i = sizeof(ngx_resolver_query_t); | |
893 | |
894 while (i < (ngx_uint_t) n) { | |
895 if (buf[i] == '\0') { | |
896 goto found; | |
897 } | |
898 | |
899 len = buf[i]; | |
900 i += 1 + len; | |
901 } | |
902 | |
903 goto short_response; | |
904 | |
905 found: | |
906 | |
907 if (i++ == 0) { | |
908 err = "zero-length domain name in DNS response"; | |
909 goto done; | |
910 } | |
911 | |
912 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t)) | |
913 > (ngx_uint_t) n) | |
914 { | |
915 goto short_response; | |
916 } | |
917 | |
918 qs = (ngx_resolver_qs_t *) &buf[i]; | |
919 | |
920 qtype = (qs->type_hi << 8) + qs->type_lo; | |
921 qclass = (qs->class_hi << 8) + qs->class_lo; | |
922 | |
923 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
924 "resolver DNS response qt:%d cl:%d", qtype, qclass); | |
925 | |
926 if (qclass != 1) { | |
927 ngx_log_error(r->log_level, r->log, 0, | |
928 "unknown query class %d in DNS response", qclass); | |
929 return; | |
930 } | |
931 | |
932 switch (qtype) { | |
933 | |
934 case NGX_RESOLVE_A: | |
935 | |
936 ngx_resolver_process_a(r, buf, n, ident, code, nan, | |
937 i + sizeof(ngx_resolver_qs_t)); | |
938 | |
939 break; | |
940 | |
941 case NGX_RESOLVE_PTR: | |
942 | |
943 ngx_resolver_process_ptr(r, buf, n, ident, code); | |
944 | |
945 break; | |
946 | |
947 default: | |
948 ngx_log_error(r->log_level, r->log, 0, | |
949 "unknown query type %d in DNS response", qtype); | |
950 return; | |
951 } | |
952 | |
953 return; | |
954 | |
955 short_response: | |
956 | |
957 err = "short dns response"; | |
958 | |
959 done: | |
960 | |
961 ngx_log_error(r->log_level, r->log, 0, err); | |
962 | |
963 return; | |
964 } | |
965 | |
966 | |
967 static void | |
968 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last, | |
969 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans) | |
583 | 970 { |
1649 | 971 char *err; |
972 u_char *cname; | |
973 size_t len; | |
974 uint32_t hash; | |
975 in_addr_t addr, *addrs; | |
976 ngx_str_t name; | |
977 ngx_uint_t qtype, qident, naddrs, a, i, n, start; | |
978 ngx_resolver_an_t *an; | |
979 ngx_resolver_ctx_t *ctx, *next; | |
980 ngx_resolver_node_t *rn; | |
981 | |
982 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) { | |
983 return; | |
984 } | |
985 | |
986 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); | |
987 | |
988 hash = ngx_crc32_short(name.data, name.len); | |
989 | |
990 /* lock name mutex */ | |
991 | |
992 rn = ngx_resolver_lookup_name(r, &name, hash); | |
993 | |
994 if (rn == NULL || rn->query == NULL) { | |
995 ngx_log_error(r->log_level, r->log, 0, | |
996 "unexpected response for %V", &name); | |
997 goto failed; | |
998 } | |
999 | |
1000 qident = (rn->query[0] << 8) + rn->query[1]; | |
1001 | |
1002 if (ident != qident) { | |
1003 ngx_log_error(r->log_level, r->log, 0, | |
1004 "wrong ident %d response for %V, expect %d", | |
1005 ident, &name, qident); | |
1006 goto failed; | |
1007 } | |
1008 | |
1009 if (code) { | |
1010 next = rn->waiting; | |
1011 rn->waiting = NULL; | |
1012 | |
1013 ngx_queue_remove(&rn->queue); | |
1014 | |
1015 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
1016 | |
1017 ngx_resolver_free_node(r, rn); | |
1018 | |
1019 /* unlock name mutex */ | |
1020 | |
1021 while (next) { | |
1022 ctx = next; | |
1023 ctx->state = code; | |
1024 next = ctx->next; | |
1025 | |
1026 ctx->handler(ctx); | |
1027 } | |
1028 | |
1029 return; | |
1030 } | |
1031 | |
1032 i = ans; | |
1033 naddrs = 0; | |
1034 addr = 0; | |
1035 addrs = NULL; | |
1036 cname = NULL; | |
1037 qtype = 0; | |
1038 | |
1039 for (a = 0; a < nan; a++) { | |
1040 | |
1041 start = i; | |
1042 | |
1043 while (i < last) { | |
1044 | |
1045 if (buf[i] & 0xc0) { | |
1046 i += 2; | |
1047 goto found; | |
1048 } | |
1049 | |
1050 if (buf[i] == 0) { | |
1051 i++; | |
1052 goto test_length; | |
1053 } | |
1054 | |
1055 i += 1 + buf[i]; | |
1056 } | |
1057 | |
1058 goto short_response; | |
1059 | |
1060 test_length: | |
1061 | |
1062 if (i - start < 2) { | |
1063 err = "invalid name in dns response"; | |
1064 goto invalid; | |
1065 } | |
1066 | |
1067 found: | |
1068 | |
1069 if (i + sizeof(ngx_resolver_an_t) >= last) { | |
1070 goto short_response; | |
1071 } | |
1072 | |
1073 an = (ngx_resolver_an_t *) &buf[i]; | |
1074 | |
1075 qtype = (an->type_hi << 8) + an->type_lo; | |
1076 len = (an->len_hi << 8) + an->len_lo; | |
1077 | |
1078 if (qtype == NGX_RESOLVE_A) { | |
1079 | |
1080 i += sizeof(ngx_resolver_an_t); | |
1081 | |
1082 if (i + len > last) { | |
1083 goto short_response; | |
1084 } | |
1085 | |
1086 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
1087 + (buf[i + 2] << 8) + (buf[i + 3])); | |
1088 | |
1089 naddrs++; | |
1090 | |
1091 i += len; | |
1092 | |
1093 } else if (qtype == NGX_RESOLVE_CNAME) { | |
1094 cname = &buf[i] + sizeof(ngx_resolver_an_t); | |
1095 i += sizeof(ngx_resolver_an_t) + len; | |
1096 } | |
1097 } | |
1098 | |
1099 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1100 "resolver naddrs:%ui cname:%p", naddrs, cname); | |
1101 | |
1102 if (naddrs) { | |
1103 | |
1104 if (naddrs == 1) { | |
1105 rn->u.addr = addr; | |
1106 | |
1107 } else { | |
1108 | |
1109 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t)); | |
1110 if (addrs == NULL) { | |
1111 return; | |
1112 } | |
1113 | |
1114 n = 0; | |
1115 i = ans; | |
1116 | |
1117 for (a = 0; a < nan; a++) { | |
1118 | |
1119 for ( ;; ) { | |
1120 | |
1121 if (buf[i] & 0xc0) { | |
1122 i += 2; | |
1123 goto ok; | |
1124 } | |
1125 | |
1126 if (buf[i] == 0) { | |
1127 i++; | |
1128 goto ok; | |
1129 } | |
1130 | |
1131 i += 1 + buf[i]; | |
1132 } | |
1133 | |
1134 ok: | |
1135 | |
1136 an = (ngx_resolver_an_t *) &buf[i]; | |
1137 | |
1138 qtype = (an->type_hi << 8) + an->type_lo; | |
1139 len = (an->len_hi << 8) + an->len_lo; | |
1140 | |
1141 i += sizeof(ngx_resolver_an_t); | |
1142 | |
1143 if (qtype == NGX_RESOLVE_A) { | |
1144 | |
1145 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
1146 + (buf[i + 2] << 8) + (buf[i + 3])); | |
1147 | |
1148 if (n == naddrs) { | |
1149 break; | |
1150 } | |
1151 } | |
1152 | |
1153 i += len; | |
1154 } | |
1155 | |
1156 rn->u.addrs = addrs; | |
1157 | |
1158 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
1159 naddrs * sizeof(in_addr_t)); | |
1160 if (addrs == NULL) { | |
1161 return; | |
1162 } | |
1163 } | |
1164 | |
1165 rn->naddrs = (u_short) naddrs; | |
1166 | |
1167 ngx_queue_remove(&rn->queue); | |
1168 | |
1169 rn->valid = ngx_time() + r->valid; | |
1170 rn->expire = ngx_time() + r->expire; | |
1171 | |
1172 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
1173 | |
1174 next = rn->waiting; | |
1175 rn->waiting = NULL; | |
1176 | |
1177 /* unlock name mutex */ | |
1178 | |
1179 while (next) { | |
1180 ctx = next; | |
1181 ctx->state = NGX_OK; | |
1182 ctx->naddrs = naddrs; | |
1183 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
1184 ctx->addr = addr; | |
1185 next = ctx->next; | |
1186 | |
1187 ctx->handler(ctx); | |
1188 } | |
1189 | |
1190 if (naddrs) { | |
1191 ngx_resolver_free(r, addrs); | |
1192 } | |
1193 | |
1194 return; | |
1195 | |
1196 } else if (cname) { | |
1197 | |
1198 /* CNAME only */ | |
1199 | |
1200 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) { | |
1201 return; | |
1202 } | |
1203 | |
1204 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1205 "resolver cname:\"%V\"", &name); | |
1206 | |
1207 rn->cnlen = (u_short) name.len; | |
1208 rn->u.cname = name.data; | |
1209 rn->valid = ngx_time() + r->valid; | |
1210 rn->expire = ngx_time() + r->expire; | |
1211 | |
1212 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
1213 | |
1214 ctx = rn->waiting; | |
1215 rn->waiting = NULL; | |
1216 | |
1217 if (ctx) { | |
1218 ctx->name = name; | |
1219 | |
1220 (void) ngx_resolve_name_locked(r, ctx); | |
1221 } | |
1222 | |
1223 return; | |
1224 } | |
1225 | |
1226 ngx_log_error(r->log_level, r->log, 0, | |
1227 "no A or CNAME types in DNS responses, unknown query type: %d", | |
1228 qtype); | |
1229 return; | |
1230 | |
1231 short_response: | |
1232 | |
1233 err = "short dns response"; | |
1234 | |
1235 invalid: | |
1236 | |
1237 /* unlock name mutex */ | |
1238 | |
1239 ngx_log_error(r->log_level, r->log, 0, err); | |
1240 | |
1241 return; | |
1242 | |
1243 failed: | |
1244 | |
1245 /* unlock name mutex */ | |
1246 | |
1247 return; | |
1248 } | |
1249 | |
1250 | |
1251 static void | |
1252 ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, | |
1253 ngx_uint_t ident, ngx_uint_t code) | |
1254 { | |
1255 char *err; | |
1256 size_t len; | |
1257 in_addr_t addr; | |
1258 ngx_int_t digit; | |
1259 ngx_str_t name; | |
1260 ngx_uint_t i, mask, qtype, qclass, qident; | |
1261 ngx_resolver_an_t *an; | |
1262 ngx_resolver_ctx_t *ctx, *next; | |
1263 ngx_resolver_node_t *rn; | |
1264 | |
1265 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) { | |
1266 goto invalid_in_addr_arpa; | |
1267 } | |
1268 | |
1269 addr = 0; | |
1270 i = 12; | |
1271 | |
1272 for (mask = 0; mask < 32; mask += 8) { | |
1273 len = buf[i++]; | |
1274 | |
1275 digit = ngx_atoi(&buf[i], len); | |
1276 if (digit == NGX_ERROR || digit > 255) { | |
1277 goto invalid_in_addr_arpa; | |
1278 } | |
1279 | |
1280 addr += digit << mask; | |
1281 i += len; | |
1282 } | |
1283 | |
1284 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) { | |
1285 goto invalid_in_addr_arpa; | |
1286 } | |
1287 | |
1288 /* lock addr mutex */ | |
1289 | |
1290 rn = ngx_resolver_lookup_addr(r, addr); | |
1291 | |
1292 if (rn == NULL || rn->query == NULL) { | |
1293 ngx_log_error(r->log_level, r->log, 0, | |
1294 "unexpected response for %ud.%ud.%ud.%ud", | |
1295 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
1296 (addr >> 8) & 0xff, addr & 0xff); | |
1297 goto failed; | |
1298 } | |
1299 | |
1300 qident = (rn->query[0] << 8) + rn->query[1]; | |
1301 | |
1302 if (ident != qident) { | |
1303 ngx_log_error(r->log_level, r->log, 0, | |
1304 "wrong ident %d response for %ud.%ud.%ud.%ud, expect %d", | |
1305 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
1306 (addr >> 8) & 0xff, addr & 0xff, qident); | |
1307 goto failed; | |
1308 } | |
1309 | |
1310 if (code) { | |
1311 next = rn->waiting; | |
1312 rn->waiting = NULL; | |
1313 | |
1314 ngx_queue_remove(&rn->queue); | |
1315 | |
1316 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
1317 | |
1318 ngx_resolver_free_node(r, rn); | |
1319 | |
1320 /* unlock addr mutex */ | |
1321 | |
1322 while (next) { | |
1323 ctx = next; | |
1324 ctx->state = code; | |
1325 next = ctx->next; | |
1326 | |
1327 ctx->handler(ctx); | |
1328 } | |
1329 | |
1330 return; | |
1331 } | |
1332 | |
1333 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t); | |
1334 | |
1335 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) { | |
1336 goto short_response; | |
1337 } | |
1338 | |
1339 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */ | |
1340 | |
1341 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) { | |
1342 err = "invalid in-addr.arpa name in DNS response"; | |
1343 goto invalid; | |
1344 } | |
1345 | |
1346 an = (ngx_resolver_an_t *) &buf[i + 2]; | |
1347 | |
1348 qtype = (an->type_hi << 8) + an->type_lo; | |
1349 qclass = (an->class_hi << 8) + an->class_lo; | |
1350 len = (an->len_hi << 8) + an->len_lo; | |
1351 | |
1352 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1353 "resolver qt:%d cl:%d len:%uz", qtype, qclass, len); | |
1354 | |
1355 i += 2 + sizeof(ngx_resolver_an_t); | |
1356 | |
1357 if (i + len > (ngx_uint_t) n) { | |
1358 goto short_response; | |
1359 } | |
1360 | |
1361 len -= 2; | |
1362 | |
1363 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) { | |
1364 return; | |
1365 } | |
1366 | |
1367 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name); | |
1368 | |
1369 if (len != (size_t) rn->nlen || ngx_strncmp(name.data, rn->name, len) != 0) | |
1370 { | |
1371 ngx_resolver_free(r, rn->name); | |
1372 rn->name = name.data; | |
1373 | |
1374 name.data = ngx_resolver_dup(r, rn->name, len); | |
1375 if (name.data == NULL) { | |
1376 goto failed; | |
1377 } | |
1378 } | |
1379 | |
1380 ngx_queue_remove(&rn->queue); | |
1381 | |
1382 rn->valid = ngx_time() + r->valid; | |
1383 rn->expire = ngx_time() + r->expire; | |
1384 | |
1385 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
1386 | |
1387 next = rn->waiting; | |
1388 rn->waiting = NULL; | |
1389 | |
1390 /* unlock addr mutex */ | |
1391 | |
1392 while (next) { | |
1393 ctx = next; | |
1394 ctx->state = NGX_OK; | |
1395 ctx->name = name; | |
1396 next = ctx->next; | |
1397 | |
1398 ctx->handler(ctx); | |
1399 } | |
1400 | |
1401 ngx_resolver_free(r, name.data); | |
1402 | |
1403 return; | |
1404 | |
1405 invalid_in_addr_arpa: | |
1406 | |
1407 ngx_log_error(r->log_level, r->log, 0, | |
1408 "invalid in-addr.arpa name in DNS response"); | |
1409 return; | |
1410 | |
1411 short_response: | |
1412 | |
1413 err = "short DNS response"; | |
1414 | |
1415 invalid: | |
1416 | |
1417 /* unlock addr mutex */ | |
1418 | |
1419 ngx_log_error(r->log_level, r->log, 0, err); | |
1420 | |
1421 return; | |
1422 | |
1423 failed: | |
1424 | |
1425 /* unlock addr mutex */ | |
1426 | |
1427 return; | |
1428 } | |
1429 | |
1430 | |
1431 static ngx_resolver_node_t * | |
1432 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) | |
1433 { | |
1434 ngx_int_t rc; | |
1435 size_t len; | |
1436 ngx_rbtree_node_t *node, *sentinel; | |
1437 ngx_resolver_node_t *rn; | |
1438 | |
1439 node = r->name_rbtree.root; | |
1440 sentinel = r->name_rbtree.sentinel; | |
1441 | |
1442 while (node != sentinel) { | |
1443 | |
1444 if (hash < node->key) { | |
1445 node = node->left; | |
1446 continue; | |
1447 } | |
1448 | |
1449 if (hash > node->key) { | |
1450 node = node->right; | |
1451 continue; | |
1452 } | |
1453 | |
1454 /* hash == node->key */ | |
1455 | |
1456 do { | |
1457 rn = (ngx_resolver_node_t *) node; | |
1458 | |
1459 len = (name->len > (size_t) rn->nlen) ? rn->nlen : name->len; | |
1460 | |
1461 rc = ngx_strncmp(name->data, rn->name, len); | |
1462 | |
1463 if (rc == 0) { | |
1464 return rn; | |
1465 } | |
1466 | |
1467 node = (rc < 0) ? node->left : node->right; | |
1468 | |
1469 } while (node != sentinel && hash == node->key); | |
1470 | |
1471 break; | |
1472 } | |
1473 | |
1474 /* not found */ | |
1475 | |
1476 return NULL; | |
1477 } | |
1478 | |
1479 | |
1480 static ngx_resolver_node_t * | |
1481 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr) | |
1482 { | |
1483 ngx_rbtree_node_t *node, *sentinel; | |
1484 | |
1485 node = r->addr_rbtree.root; | |
1486 sentinel = r->addr_rbtree.sentinel; | |
1487 | |
1488 while (node != sentinel) { | |
1489 | |
1490 if (addr < node->key) { | |
1491 node = node->left; | |
1492 continue; | |
1493 } | |
1494 | |
1495 if (addr > node->key) { | |
1496 node = node->right; | |
1497 continue; | |
1498 } | |
1499 | |
1500 /* addr == node->key */ | |
1501 | |
1502 return (ngx_resolver_node_t *) node; | |
1503 } | |
1504 | |
1505 /* not found */ | |
1506 | |
1507 return NULL; | |
1508 } | |
1509 | |
1510 | |
1511 static void | |
1512 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
1513 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
1514 { | |
1515 size_t len; | |
1516 ngx_rbtree_node_t **p; | |
1517 ngx_resolver_node_t *rn, *rn_temp; | |
1518 | |
1519 for ( ;; ) { | |
1520 | |
1521 if (node->key < temp->key) { | |
1522 | |
1523 p = &temp->left; | |
1524 | |
1525 } else if (node->key > temp->key) { | |
1526 | |
1527 p = &temp->right; | |
1528 | |
1529 } else { /* node->key == temp->key */ | |
1530 | |
1531 rn = (ngx_resolver_node_t *) node; | |
1532 rn_temp = (ngx_resolver_node_t *) temp; | |
1533 | |
1534 len = (rn->nlen > rn_temp->nlen) ? rn_temp->nlen : rn->nlen; | |
1535 | |
1536 p = (ngx_strncmp(rn->name, rn_temp->name, len) < 0) | |
1537 ? &temp->left : &temp->right; | |
1538 } | |
1539 | |
1540 if (*p == sentinel) { | |
1541 break; | |
1542 } | |
1543 | |
1544 temp = *p; | |
1545 } | |
1546 | |
1547 *p = node; | |
1548 node->parent = temp; | |
1549 node->left = sentinel; | |
1550 node->right = sentinel; | |
1551 ngx_rbt_red(node); | |
1552 } | |
1553 | |
1554 | |
1555 static ngx_int_t | |
1556 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
1557 { | |
1558 u_char *p, *s; | |
1559 size_t len; | |
1560 ngx_uint_t ident; | |
1561 ngx_resolver_qs_t *qs; | |
1562 ngx_resolver_query_t *query; | |
1563 | |
1564 len = sizeof(ngx_resolver_query_t) | |
1565 + 1 + ctx->name.len + 1 + sizeof(ngx_resolver_qs_t); | |
1566 | |
1567 p = ngx_resolver_calloc(ctx->resolver, len); | |
1568 if (p == NULL) { | |
1569 return NGX_ERROR; | |
1570 } | |
1571 | |
1572 rn->qlen = (u_short) len; | |
1573 rn->query = p; | |
1574 | |
1575 query = (ngx_resolver_query_t *) p; | |
1576 | |
1577 ident = ngx_random(); | |
1578 | |
1579 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0, | |
1580 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff); | |
1581 | |
1582 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
1583 query->ident_lo = (u_char) (ident & 0xff); | |
1584 | |
1585 /* recursion query */ | |
1586 query->flags_hi = 1; query->flags_lo = 0; | |
1587 | |
1588 /* one question */ | |
1589 query->nqs_hi = 0; query->nqs_lo = 1; | |
1590 query->nan_hi = 0; query->nan_lo = 0; | |
1591 query->nns_hi = 0; query->nns_lo = 0; | |
1592 query->nar_hi = 0; query->nar_lo = 0; | |
1593 | |
1594 p += sizeof(ngx_resolver_query_t) + 1 + ctx->name.len + 1; | |
1595 | |
1596 qs = (ngx_resolver_qs_t *) p; | |
1597 | |
1598 /* query type */ | |
1599 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type; | |
1600 | |
1601 /* IP query class */ | |
1602 qs->class_hi = 0; qs->class_lo = 1; | |
1603 | |
1604 /* convert "www.example.com" to "\3www\7example\3com\0" */ | |
1605 | |
1606 len = 0; | |
1607 p--; | |
1608 *p-- = '\0'; | |
1609 | |
1610 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) { | |
1611 if (*s != '.') { | |
1612 *p = *s; | |
1613 len++; | |
1614 | |
1615 } else { | |
1616 *p = (u_char) len; | |
1617 len = 0; | |
1618 } | |
1619 | |
1620 p--; | |
1621 } | |
1622 | |
1623 *p = (u_char) len; | |
1624 | |
1625 return NGX_OK; | |
1626 } | |
1627 | |
1628 | |
1629 /* AF_INET only */ | |
1630 | |
1631 static ngx_int_t | |
1632 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
1633 { | |
1634 u_char *p, *d; | |
1635 size_t len; | |
1636 ngx_int_t n; | |
1637 ngx_uint_t ident; | |
1638 ngx_resolver_query_t *query; | |
1639 | |
1640 len = sizeof(ngx_resolver_query_t) | |
1641 + sizeof(".255.255.255.255.in-addr.arpa.") - 1 | |
1642 + sizeof(ngx_resolver_qs_t); | |
1643 | |
1644 p = ngx_resolver_calloc(ctx->resolver, len); | |
1645 if (p == NULL) { | |
1646 return NGX_ERROR; | |
1647 } | |
1648 | |
1649 rn->query = p; | |
1650 query = (ngx_resolver_query_t *) p; | |
1651 | |
1652 ident = ngx_random(); | |
1653 | |
1654 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
1655 query->ident_lo = (u_char) (ident & 0xff); | |
1656 | |
1657 /* recursion query */ | |
1658 query->flags_hi = 1; query->flags_lo = 0; | |
1659 | |
1660 /* one question */ | |
1661 query->nqs_hi = 0; query->nqs_lo = 1; | |
1662 query->nan_hi = 0; query->nan_lo = 0; | |
1663 query->nns_hi = 0; query->nns_lo = 0; | |
1664 query->nar_hi = 0; query->nar_lo = 0; | |
1665 | |
1666 p += sizeof(ngx_resolver_query_t); | |
1667 | |
1668 for (n = 0; n < 32; n += 8){ | |
1669 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff); | |
1670 *p = (u_char) (d - &p[1]); | |
1671 p = d; | |
1672 } | |
1673 | |
1674 /* query type "PTR", IP query class */ | |
1675 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18); | |
1676 | |
1677 rn->qlen = (u_short) | |
1678 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t) | |
1679 - rn->query); | |
1680 | |
1681 return NGX_OK; | |
1682 } | |
1683 | |
1684 | |
1685 static ngx_int_t | |
1686 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src, | |
1687 u_char *last) | |
1688 { | |
1689 char *err; | |
1690 u_char *p, *dst; | |
1691 ssize_t len; | |
1692 ngx_uint_t i, n; | |
1693 | |
1694 p = src; | |
1695 len = -1; | |
1696 | |
1697 /* | |
1698 * compression pointers allow to create endless loop, so we set limit; | |
1699 * 128 pointers should be enough to store 255-byte name | |
1700 */ | |
1701 | |
1702 for (i = 0; i < 128; i++) { | |
1703 n = *p++; | |
1704 | |
1705 if (n == 0) { | |
1706 goto done; | |
1707 } | |
1708 | |
1709 if (n & 0xc0) { | |
1710 n = (n & 0x3f << 8) + *p; | |
1711 p = &buf[n]; | |
1712 | |
1713 } else { | |
1714 len += 1 + n; | |
1715 p = &p[n]; | |
1716 } | |
1717 | |
1718 if (p >= last) { | |
1719 err = "name is out of response"; | |
1720 goto invalid; | |
1721 } | |
1722 } | |
1723 | |
1724 err = "compression pointers loop"; | |
1725 | |
1726 invalid: | |
1727 | |
1728 ngx_log_error(r->log_level, r->log, 0, err); | |
1729 | |
1730 return NGX_ERROR; | |
1731 | |
1732 done: | |
1733 | |
1734 if (name == NULL) { | |
583 | 1735 return NGX_OK; |
1736 } | |
1737 | |
1649 | 1738 dst = ngx_resolver_alloc(r, len); |
1739 if (dst == NULL) { | |
1740 return NGX_ERROR; | |
1741 } | |
1742 | |
1743 name->data = dst; | |
1744 | |
1745 n = *src++; | |
1746 | |
1747 for ( ;; ) { | |
1748 if (n != 0xc0) { | |
1749 ngx_memcpy(dst, src, n); | |
1750 dst += n; | |
1751 src += n; | |
1752 | |
1753 n = *src++; | |
1754 | |
1755 if (n != 0) { | |
1756 *dst++ = '.'; | |
1757 } | |
1758 | |
1759 } else { | |
1760 n = (n & 0x3f << 8) + *src; | |
1761 src = &buf[n]; | |
1762 | |
1763 n = *src++; | |
1764 } | |
1765 | |
1766 if (n == 0) { | |
1767 name->len = dst - name->data; | |
1768 return NGX_OK; | |
1769 } | |
1770 } | |
1771 } | |
1772 | |
1773 | |
1774 static void | |
1775 ngx_resolver_timeout_handler(ngx_event_t *ev) | |
1776 { | |
1777 ngx_resolver_ctx_t *ctx; | |
1778 | |
1779 ctx = ev->data; | |
1780 | |
1781 ctx->state = NGX_RESOLVE_TIMEDOUT; | |
1782 | |
1783 ctx->handler(ctx); | |
1784 } | |
1785 | |
1786 | |
1787 static void | |
1788 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
1789 { | |
1790 /* lock alloc mutex */ | |
1791 | |
1792 if (rn->query) { | |
1793 ngx_resolver_free_locked(r, rn->query); | |
1794 } | |
1795 | |
1796 if (rn->name) { | |
1797 ngx_resolver_free_locked(r, rn->name); | |
1798 } | |
1799 | |
1800 if (rn->cnlen) { | |
1801 ngx_resolver_free_locked(r, rn->u.cname); | |
1802 } | |
1803 | |
1804 if (rn->naddrs > 1) { | |
1805 ngx_resolver_free_locked(r, rn->u.addrs); | |
1806 } | |
1807 | |
1808 ngx_resolver_free_locked(r, rn); | |
1809 | |
1810 /* unlock alloc mutex */ | |
1811 } | |
1812 | |
1813 | |
1814 static void * | |
1815 ngx_resolver_alloc(ngx_resolver_t *r, size_t size) | |
1816 { | |
1817 u_char *p; | |
1818 | |
1819 /* lock alloc mutex */ | |
1820 | |
1821 p = ngx_alloc(size, r->log); | |
1822 | |
1823 /* unlock alloc mutex */ | |
1824 | |
1825 return p; | |
1826 } | |
1827 | |
1828 | |
1829 void * | |
1830 ngx_resolver_calloc(ngx_resolver_t *r, size_t size) | |
1831 { | |
1832 u_char *p; | |
1833 | |
1834 p = ngx_resolver_alloc(r, size); | |
1835 | |
1836 if (p) { | |
1837 ngx_memzero(p, size); | |
1838 } | |
1839 | |
1840 return p; | |
1841 } | |
1842 | |
1843 | |
1844 static void | |
1845 ngx_resolver_free(ngx_resolver_t *r, void *p) | |
1846 { | |
1847 /* lock alloc mutex */ | |
1848 | |
1849 ngx_free(p); | |
1850 | |
1851 /* unlock alloc mutex */ | |
1852 } | |
1853 | |
1854 | |
1855 static void | |
1856 ngx_resolver_free_locked(ngx_resolver_t *r, void *p) | |
1857 { | |
1858 ngx_free(p); | |
1859 } | |
1860 | |
1861 | |
1862 static void * | |
1863 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size) | |
1864 { | |
1865 void *dst; | |
1866 | |
1867 dst = ngx_resolver_alloc(r, size); | |
1868 | |
1869 if (dst == NULL) { | |
1870 return dst; | |
1871 } | |
1872 | |
1873 ngx_memcpy(dst, src, size); | |
1874 | |
1875 return dst; | |
1876 } | |
1877 | |
1878 | |
1879 char * | |
1880 ngx_resolver_strerror(ngx_int_t err) | |
1881 { | |
1882 static char *errors[] = { | |
1883 "Format error", /* FORMERR */ | |
1884 "Server failure", /* SERVFAIL */ | |
1885 "Host not found", /* NXDOMAIN */ | |
1886 "Unimplemented", /* NOTIMP */ | |
1887 "Operation refused" /* REFUSED */ | |
1888 }; | |
1889 | |
1890 if (err > 0 && err < 6) { | |
1891 return errors[err - 1]; | |
1892 } | |
1893 | |
1894 if (err == NGX_RESOLVE_TIMEDOUT) { | |
1895 return "Operation timed out"; | |
1896 } | |
1897 | |
1898 return "Unknown error"; | |
1899 } | |
1900 | |
1901 | |
1902 ngx_int_t | |
1903 ngx_udp_connect(ngx_udp_connection_t *uc) | |
1904 { | |
1905 int rc; | |
1906 ngx_int_t event; | |
1907 ngx_event_t *rev, *wev; | |
1908 ngx_socket_t s; | |
1909 ngx_connection_t *c; | |
1910 | |
583 | 1911 s = ngx_socket(AF_INET, SOCK_DGRAM, 0); |
1912 | |
1649 | 1913 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, uc->log, 0, "UDP socket %d", s); |
583 | 1914 |
1915 if (s == -1) { | |
1649 | 1916 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
583 | 1917 ngx_socket_n " failed"); |
1918 return NGX_ERROR; | |
1919 } | |
1920 | |
1649 | 1921 c = ngx_get_connection(s, uc->log); |
583 | 1922 |
1923 if (c == NULL) { | |
1924 if (ngx_close_socket(s) == -1) { | |
1649 | 1925 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
583 | 1926 ngx_close_socket_n "failed"); |
1927 } | |
1928 | |
1929 return NGX_ERROR; | |
1930 } | |
1931 | |
1649 | 1932 if (ngx_nonblocking(s) == -1) { |
1933 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
1934 ngx_nonblocking_n " failed"); | |
1935 | |
1936 ngx_free_connection(c); | |
1937 | |
1938 if (ngx_close_socket(s) == -1) { | |
1939 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
1940 ngx_close_socket_n " failed"); | |
1941 } | |
1942 | |
1943 return NGX_ERROR; | |
1944 } | |
1945 | |
583 | 1946 rev = c->read; |
1947 wev = c->write; | |
1948 | |
1649 | 1949 rev->log = uc->log; |
1950 wev->log = uc->log; | |
1951 | |
1952 uc->connection = c; | |
583 | 1953 |
1954 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); | |
1955 | |
1956 #if (NGX_THREADS) | |
1649 | 1957 |
1958 /* TODO: lock event when call completion handler */ | |
1959 | |
1960 rev->lock = &c->lock; | |
1961 wev->lock = &c->lock; | |
583 | 1962 rev->own_lock = &c->lock; |
1963 wev->own_lock = &c->lock; | |
1649 | 1964 |
583 | 1965 #endif |
1966 | |
1649 | 1967 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, uc->log, 0, |
1968 "connect to %V, fd:%d #%d", &uc->server, s, c->number); | |
1969 | |
1970 rc = connect(s, uc->sockaddr, uc->socklen); | |
1971 | |
1972 /* TODO: aio, iocp */ | |
583 | 1973 |
1974 if (rc == -1) { | |
1649 | 1975 ngx_log_error(NGX_LOG_CRIT, uc->log, ngx_socket_errno, |
1976 "connect() to %V failed", &uc->server); | |
583 | 1977 |
1978 return NGX_ERROR; | |
1979 } | |
1980 | |
1649 | 1981 /* UDP sockets are always ready to write */ |
1982 wev->ready = 1; | |
1983 | |
1984 if (ngx_add_event) { | |
1985 | |
1986 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ? | |
1987 /* kqueue, epoll */ NGX_CLEAR_EVENT: | |
1988 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT; | |
1989 /* eventport event type has no meaning: oneshot only */ | |
1990 | |
1991 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { | |
1992 return NGX_ERROR; | |
1993 } | |
1994 | |
1995 } else { | |
1996 /* rtsig */ | |
1997 | |
583 | 1998 if (ngx_add_conn(c) == NGX_ERROR) { |
1999 return NGX_ERROR; | |
2000 } | |
2001 } | |
2002 | |
2003 return NGX_OK; | |
2004 } |