Mercurial > hg > nginx-quic
annotate src/core/ngx_resolver.c @ 1960:1609b3c3d604
fix memory leak on resolver query send failure
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Wed, 09 Apr 2008 14:26:08 +0000 |
parents | d02fb350d17d |
children | 99b9feacccb4 |
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 | |
1906 | 53 static void ngx_resolver_cleanup(void *data); |
54 static void ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree); | |
1649 | 55 static ngx_int_t ngx_resolve_name_locked(ngx_resolver_t *r, |
56 ngx_resolver_ctx_t *ctx); | |
57 static void ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
58 ngx_queue_t *queue); | |
59 static ngx_int_t ngx_resolver_send_query(ngx_resolver_t *r, | |
60 ngx_resolver_node_t *rn); | |
61 static ngx_int_t ngx_resolver_create_name_query(ngx_resolver_node_t *rn, | |
62 ngx_resolver_ctx_t *ctx); | |
63 static ngx_int_t ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, | |
64 ngx_resolver_ctx_t *ctx); | |
65 static void ngx_resolver_resend_handler(ngx_event_t *ev); | |
66 static time_t ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
67 ngx_queue_t *queue); | |
68 static void ngx_resolver_read_response(ngx_event_t *rev); | |
69 static void ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, | |
70 size_t n); | |
71 static void ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t n, | |
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72 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans); |
1649 | 73 static void ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, |
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74 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan); |
1649 | 75 static ngx_resolver_node_t *ngx_resolver_lookup_name(ngx_resolver_t *r, |
76 ngx_str_t *name, uint32_t hash); | |
77 static ngx_resolver_node_t *ngx_resolver_lookup_addr(ngx_resolver_t *r, | |
78 in_addr_t addr); | |
79 static void ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
80 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel); | |
81 static ngx_int_t ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, | |
82 u_char *buf, u_char *src, u_char *last); | |
83 static void ngx_resolver_timeout_handler(ngx_event_t *ev); | |
84 static void ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn); | |
85 static void *ngx_resolver_alloc(ngx_resolver_t *r, size_t size); | |
1903 | 86 static void *ngx_resolver_calloc(ngx_resolver_t *r, size_t size); |
1649 | 87 static void ngx_resolver_free(ngx_resolver_t *r, void *p); |
88 static void ngx_resolver_free_locked(ngx_resolver_t *r, void *p); | |
89 static void *ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size); | |
90 | |
91 | |
92 /* STUB: ngx_peer_addr_t * */ | |
93 | |
94 ngx_resolver_t * | |
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95 ngx_resolver_create(ngx_conf_t *cf, ngx_peer_addr_t *addr) |
1649 | 96 { |
97 ngx_resolver_t *r; | |
1906 | 98 ngx_pool_cleanup_t *cln; |
1649 | 99 ngx_udp_connection_t *uc; |
100 | |
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101 cln = ngx_pool_cleanup_add(cf->pool, 0); |
1906 | 102 if (cln == NULL) { |
103 return NULL; | |
104 } | |
105 | |
106 cln->handler = ngx_resolver_cleanup; | |
107 | |
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108 r = ngx_calloc(sizeof(ngx_resolver_t), cf->log); |
1649 | 109 if (r == NULL) { |
110 return NULL; | |
111 } | |
112 | |
1906 | 113 cln->data = r; |
114 | |
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115 r->event = ngx_calloc(sizeof(ngx_event_t), cf->log); |
1649 | 116 if (r->event == NULL) { |
117 return NULL; | |
118 } | |
119 | |
1687 | 120 ngx_rbtree_init(&r->name_rbtree, &r->name_sentinel, |
121 ngx_resolver_rbtree_insert_value); | |
122 | |
123 ngx_rbtree_init(&r->addr_rbtree, &r->addr_sentinel, | |
124 ngx_rbtree_insert_value); | |
1649 | 125 |
1685 | 126 ngx_queue_init(&r->name_resend_queue); |
127 ngx_queue_init(&r->addr_resend_queue); | |
128 | |
129 ngx_queue_init(&r->name_expire_queue); | |
130 ngx_queue_init(&r->addr_expire_queue); | |
1649 | 131 |
132 r->event->handler = ngx_resolver_resend_handler; | |
133 r->event->data = r; | |
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134 r->event->log = cf->cycle->new_log; |
1649 | 135 r->ident = -1; |
136 | |
137 r->resend_timeout = 5; | |
138 r->expire = 30; | |
139 r->valid = 300; | |
140 | |
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141 r->log = cf->cycle->new_log; |
1649 | 142 r->log_level = NGX_LOG_ALERT; |
143 | |
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144 if (addr) { |
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145 uc = ngx_calloc(sizeof(ngx_udp_connection_t), cf->log); |
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146 if (uc == NULL) { |
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147 return NULL; |
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148 } |
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149 |
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150 r->udp_connection = uc; |
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151 |
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152 uc->sockaddr = addr->sockaddr; |
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153 uc->socklen = addr->socklen; |
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154 uc->server = addr->name; |
1914 | 155 uc->log = cf->cycle->new_log; |
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156 } |
1649 | 157 |
158 return r; | |
159 } | |
160 | |
161 | |
1906 | 162 static void |
163 ngx_resolver_cleanup(void *data) | |
164 { | |
165 ngx_resolver_t *r = data; | |
166 | |
167 if (r) { | |
168 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, | |
169 "cleanup resolver"); | |
170 | |
171 ngx_resolver_cleanup_tree(r, &r->name_rbtree); | |
172 | |
173 ngx_resolver_cleanup_tree(r, &r->addr_rbtree); | |
174 | |
175 if (r->event) { | |
176 ngx_free(r->event); | |
177 } | |
178 | |
179 if (r->udp_connection) { | |
180 if (r->udp_connection->connection) { | |
181 ngx_close_connection(r->udp_connection->connection); | |
182 } | |
183 | |
184 ngx_free(r->udp_connection); | |
185 } | |
186 | |
187 ngx_free(r); | |
188 } | |
189 } | |
190 | |
191 | |
192 static void | |
193 ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree) | |
194 { | |
195 ngx_resolver_ctx_t *ctx, *next; | |
196 ngx_resolver_node_t *rn; | |
197 | |
198 while (tree->root != tree->sentinel) { | |
199 | |
200 rn = (ngx_resolver_node_t *) ngx_rbtree_min(tree->root, tree->sentinel); | |
201 | |
202 ngx_queue_remove(&rn->queue); | |
203 | |
204 for (ctx = rn->waiting; ctx; ctx = next) { | |
205 next = ctx->next; | |
206 | |
207 if (ctx->event) { | |
208 ngx_resolver_free(r, ctx->event); | |
209 } | |
210 | |
211 ngx_resolver_free(r, ctx); | |
212 } | |
213 | |
214 ngx_rbtree_delete(tree, &rn->node); | |
215 | |
216 ngx_resolver_free_node(r, rn); | |
217 } | |
218 } | |
219 | |
220 | |
1649 | 221 ngx_resolver_ctx_t * |
222 ngx_resolve_start(ngx_resolver_t *r, ngx_resolver_ctx_t *temp) | |
223 { | |
224 in_addr_t addr; | |
225 ngx_resolver_ctx_t *ctx; | |
226 | |
227 if (temp) { | |
228 addr = ngx_inet_addr(temp->name.data, temp->name.len); | |
229 | |
230 if (addr != INADDR_NONE) { | |
231 temp->resolver = r; | |
232 temp->state = NGX_OK; | |
233 temp->naddrs = 1; | |
234 temp->addrs = &temp->addr; | |
235 temp->addr = addr; | |
236 temp->quick = 1; | |
237 | |
238 return temp; | |
239 } | |
240 } | |
241 | |
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242 if (r->udp_connection == NULL) { |
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243 return NGX_NO_RESOLVER; |
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244 } |
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245 |
1649 | 246 ctx = ngx_resolver_calloc(r, sizeof(ngx_resolver_ctx_t)); |
247 | |
248 if (ctx) { | |
249 ctx->resolver = r; | |
250 } | |
251 | |
252 return ctx; | |
253 } | |
254 | |
255 | |
256 ngx_int_t | |
257 ngx_resolve_name(ngx_resolver_ctx_t *ctx) | |
258 { | |
259 ngx_int_t rc; | |
260 ngx_resolver_t *r; | |
261 | |
262 r = ctx->resolver; | |
263 | |
264 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
265 "resolve: \"%V\"", &ctx->name); | |
266 | |
267 if (ctx->quick) { | |
268 ctx->handler(ctx); | |
269 return NGX_OK; | |
270 } | |
271 | |
272 /* lock name mutex */ | |
273 | |
274 rc = ngx_resolve_name_locked(r, ctx); | |
275 | |
276 if (rc == NGX_OK) { | |
277 return NGX_OK; | |
278 } | |
279 | |
280 /* unlock name mutex */ | |
281 | |
282 if (rc == NGX_AGAIN) { | |
283 return NGX_OK; | |
284 } | |
285 | |
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286 /* NGX_ERROR */ |
1649 | 287 |
288 if (ctx->event) { | |
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289 ngx_resolver_free(r, ctx->event); |
1649 | 290 } |
291 | |
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292 ngx_resolver_free(r, ctx); |
1649 | 293 |
294 return NGX_ERROR; | |
295 } | |
296 | |
297 | |
298 void | |
299 ngx_resolve_name_done(ngx_resolver_ctx_t *ctx) | |
300 { | |
301 uint32_t hash; | |
302 ngx_resolver_t *r; | |
303 ngx_resolver_ctx_t *w, **p; | |
304 ngx_resolver_node_t *rn; | |
305 | |
306 r = ctx->resolver; | |
307 | |
308 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
309 "resolve name done: %i", ctx->state); | |
310 | |
311 if (ctx->quick) { | |
312 return; | |
313 } | |
314 | |
315 if (ctx->event && ctx->event->timer_set) { | |
316 ngx_del_timer(ctx->event); | |
317 } | |
318 | |
319 /* lock name mutex */ | |
320 | |
321 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
322 | |
323 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
324 | |
325 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
326 | |
327 if (rn) { | |
328 p = &rn->waiting; | |
329 w = rn->waiting; | |
330 | |
331 while (w) { | |
332 if (w == ctx) { | |
333 *p = w->next; | |
334 | |
335 goto done; | |
336 } | |
337 | |
338 p = &w->next; | |
339 w = w->next; | |
340 } | |
341 } | |
342 | |
343 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
344 "could not cancel %V resolving", &ctx->name); | |
345 } | |
346 | |
347 done: | |
348 | |
349 ngx_resolver_expire(r, &r->name_rbtree, &r->name_expire_queue); | |
350 | |
351 /* unlock name mutex */ | |
352 | |
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353 /* lock alloc mutex */ |
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354 |
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355 if (ctx->event) { |
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356 ngx_resolver_free_locked(r, ctx->event); |
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357 } |
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358 |
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359 ngx_resolver_free_locked(r, ctx); |
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360 |
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361 /* unlock alloc mutex */ |
1649 | 362 } |
363 | |
364 | |
365 /* NGX_RESOLVE_A only */ | |
366 | |
367 static ngx_int_t | |
368 ngx_resolve_name_locked(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx) | |
369 { | |
370 uint32_t hash; | |
371 in_addr_t addr, *addrs; | |
372 ngx_uint_t naddrs; | |
373 ngx_resolver_ctx_t *next; | |
374 ngx_resolver_node_t *rn; | |
375 | |
376 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
377 | |
378 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
379 | |
380 if (rn) { | |
381 | |
382 if (rn->valid >= ngx_time()) { | |
383 | |
384 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
385 | |
386 ngx_queue_remove(&rn->queue); | |
387 | |
388 rn->expire = ngx_time() + r->expire; | |
389 | |
390 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
391 | |
392 naddrs = rn->naddrs; | |
393 | |
394 if (naddrs) { | |
395 | |
396 /* NGX_RESOLVE_A answer */ | |
397 | |
398 if (naddrs != 1) { | |
399 addr = 0; | |
400 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
401 naddrs * sizeof(in_addr_t)); | |
402 if (addrs == NULL) { | |
403 return NGX_ERROR; | |
404 } | |
405 | |
406 } else { | |
407 addr = rn->u.addr; | |
408 addrs = NULL; | |
409 } | |
410 | |
411 ctx->next = rn->waiting; | |
412 rn->waiting = NULL; | |
413 | |
414 /* unlock name mutex */ | |
415 | |
416 do { | |
417 ctx->state = NGX_OK; | |
418 ctx->naddrs = naddrs; | |
419 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
420 ctx->addr = addr; | |
421 next = ctx->next; | |
422 | |
423 ctx->handler(ctx); | |
424 | |
425 ctx = next; | |
426 } while (ctx); | |
427 | |
428 if (addrs) { | |
429 ngx_resolver_free(r, addrs); | |
430 } | |
431 | |
432 return NGX_OK; | |
433 } | |
434 | |
435 /* NGX_RESOLVE_CNAME */ | |
436 | |
437 ctx->name.len = rn->cnlen; | |
438 ctx->name.data = rn->u.cname; | |
439 | |
440 return ngx_resolve_name_locked(r, ctx); | |
441 } | |
442 | |
443 if (rn->waiting) { | |
444 | |
445 ctx->next = rn->waiting; | |
446 rn->waiting = ctx; | |
447 | |
448 return NGX_AGAIN; | |
449 } | |
450 | |
451 ngx_queue_remove(&rn->queue); | |
452 | |
453 /* lock alloc mutex */ | |
454 | |
455 ngx_resolver_free_locked(r, rn->query); | |
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|
456 rn->query = NULL; |
1649 | 457 |
458 if (rn->cnlen) { | |
459 ngx_resolver_free_locked(r, rn->u.cname); | |
460 } | |
461 | |
462 if (rn->naddrs > 1) { | |
463 ngx_resolver_free_locked(r, rn->u.addrs); | |
464 } | |
465 | |
466 /* unlock alloc mutex */ | |
467 | |
468 } else { | |
469 | |
470 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
471 if (rn == NULL) { | |
472 return NGX_ERROR; | |
473 } | |
474 | |
475 rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len); | |
476 if (rn->name == NULL) { | |
477 ngx_resolver_free(r, rn); | |
478 return NGX_ERROR; | |
479 } | |
480 | |
481 rn->node.key = hash; | |
482 rn->nlen = (u_short) ctx->name.len; | |
1960
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diff
changeset
|
483 rn->query = NULL; |
1649 | 484 |
485 ngx_rbtree_insert(&r->name_rbtree, &rn->node); | |
486 } | |
487 | |
488 if (ngx_resolver_create_name_query(rn, ctx) != NGX_OK) { | |
489 goto failed; | |
490 } | |
491 | |
492 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
493 goto failed; | |
494 } | |
495 | |
496 if (ctx->event == NULL) { | |
497 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
498 if (ctx->event == NULL) { | |
499 goto failed; | |
500 } | |
501 | |
502 ctx->event->handler = ngx_resolver_timeout_handler; | |
503 ctx->event->data = ctx; | |
504 ctx->event->log = r->log; | |
505 ctx->ident = -1; | |
506 | |
507 ngx_add_timer(ctx->event, ctx->timeout); | |
508 } | |
509 | |
510 if (ngx_queue_empty(&r->name_resend_queue)) { | |
511 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
512 } | |
513 | |
514 rn->expire = ngx_time() + r->resend_timeout; | |
515 | |
516 ngx_queue_insert_head(&r->name_resend_queue, &rn->queue); | |
517 | |
518 rn->cnlen = 0; | |
519 rn->naddrs = 0; | |
520 rn->valid = 0; | |
521 rn->waiting = ctx; | |
522 | |
523 ctx->state = NGX_AGAIN; | |
524 | |
525 return NGX_AGAIN; | |
526 | |
527 failed: | |
528 | |
529 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
530 | |
1960
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diff
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|
531 if (rn->query) { |
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532 ngx_resolver_free(r, rn->query); |
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533 } |
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|
534 |
1649 | 535 ngx_resolver_free(r, rn->name); |
536 | |
537 ngx_resolver_free(r, rn); | |
538 | |
539 return NGX_ERROR; | |
540 } | |
583 | 541 |
542 | |
543 ngx_int_t | |
1649 | 544 ngx_resolve_addr(ngx_resolver_ctx_t *ctx) |
545 { | |
546 ngx_resolver_t *r; | |
547 ngx_resolver_node_t *rn; | |
548 | |
549 r = ctx->resolver; | |
550 | |
551 ctx->addr = ntohl(ctx->addr); | |
552 | |
553 /* lock addr mutex */ | |
554 | |
555 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
556 | |
557 if (rn) { | |
558 | |
559 if (rn->valid >= ngx_time()) { | |
560 | |
561 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
562 | |
563 ngx_queue_remove(&rn->queue); | |
564 | |
565 rn->expire = ngx_time() + r->expire; | |
566 | |
567 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
568 | |
569 ctx->name.len = rn->nlen; | |
570 ctx->name.data = ngx_resolver_dup(r, rn->name, rn->nlen); | |
571 if (ctx->name.data == NULL) { | |
572 goto failed; | |
573 } | |
574 | |
575 /* unlock addr mutex */ | |
576 | |
577 ctx->state = NGX_OK; | |
578 | |
579 ctx->handler(ctx); | |
580 | |
581 ngx_resolver_free(r, ctx->name.data); | |
582 | |
583 return NGX_OK; | |
584 } | |
585 | |
586 if (rn->waiting) { | |
587 | |
588 ctx->next = rn->waiting; | |
589 rn->waiting = ctx; | |
590 | |
591 return NGX_AGAIN; | |
592 } | |
593 | |
594 ngx_queue_remove(&rn->queue); | |
595 | |
596 ngx_resolver_free(r, rn->query); | |
1960
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|
597 rn->query = NULL; |
1649 | 598 |
599 } else { | |
600 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
601 if (rn == NULL) { | |
602 goto failed; | |
603 } | |
604 | |
605 rn->node.key = ctx->addr; | |
1960
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diff
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606 rn->query = NULL; |
1649 | 607 |
608 ngx_rbtree_insert(&r->addr_rbtree, &rn->node); | |
609 } | |
610 | |
611 if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) { | |
612 goto failed; | |
613 } | |
614 | |
615 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
616 goto failed; | |
617 } | |
618 | |
619 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
620 if (ctx->event == NULL) { | |
621 goto failed; | |
622 } | |
623 | |
624 ctx->event->handler = ngx_resolver_timeout_handler; | |
625 ctx->event->data = ctx; | |
626 ctx->event->log = r->log; | |
627 ctx->ident = -1; | |
628 | |
629 ngx_add_timer(ctx->event, ctx->timeout); | |
630 | |
631 if (ngx_queue_empty(&r->addr_resend_queue)) { | |
632 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
633 } | |
634 | |
635 rn->expire = ngx_time() + r->resend_timeout; | |
636 | |
637 ngx_queue_insert_head(&r->addr_resend_queue, &rn->queue); | |
638 | |
639 rn->cnlen = 0; | |
640 rn->naddrs = 0; | |
641 rn->name = NULL; | |
642 rn->nlen = 0; | |
643 rn->valid = 0; | |
644 rn->waiting = ctx; | |
645 | |
646 /* unlock addr mutex */ | |
647 | |
648 ctx->state = NGX_AGAIN; | |
649 | |
650 return NGX_OK; | |
651 | |
652 failed: | |
653 | |
654 if (rn) { | |
655 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
656 | |
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fix memory leak on resolver query send failure
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diff
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657 if (rn->query) { |
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658 ngx_resolver_free(r, rn->query); |
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659 } |
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660 |
1649 | 661 ngx_resolver_free(r, rn); |
662 } | |
663 | |
664 /* unlock addr mutex */ | |
665 | |
666 if (ctx->event) { | |
1904
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1903
diff
changeset
|
667 ngx_resolver_free(r, ctx->event); |
1649 | 668 } |
669 | |
1904
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1903
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670 ngx_resolver_free(r, ctx); |
1649 | 671 |
672 return NGX_ERROR; | |
673 } | |
674 | |
675 | |
676 void | |
677 ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx) | |
678 { | |
679 in_addr_t addr; | |
680 ngx_resolver_t *r; | |
681 ngx_resolver_ctx_t *w, **p; | |
682 ngx_resolver_node_t *rn; | |
683 | |
684 r = ctx->resolver; | |
685 | |
686 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
687 "resolve addr done: %i", ctx->state); | |
688 | |
689 if (ctx->event && ctx->event->timer_set) { | |
690 ngx_del_timer(ctx->event); | |
691 } | |
692 | |
693 /* lock addr mutex */ | |
694 | |
695 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
696 | |
697 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
698 | |
699 if (rn) { | |
700 p = &rn->waiting; | |
701 w = rn->waiting; | |
702 | |
703 while (w) { | |
704 if (w == ctx) { | |
705 *p = w->next; | |
706 | |
707 goto done; | |
708 } | |
709 | |
710 p = &w->next; | |
711 w = w->next; | |
712 } | |
713 } | |
714 | |
715 addr = ntohl(ctx->addr); | |
716 | |
717 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
718 "could not cancel %ud.%ud.%ud.%ud resolving", | |
719 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
720 (addr >> 8) & 0xff, addr & 0xff); | |
721 } | |
722 | |
723 done: | |
724 | |
725 ngx_resolver_expire(r, &r->addr_rbtree, &r->addr_expire_queue); | |
726 | |
727 /* unlock addr mutex */ | |
728 | |
1904
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diff
changeset
|
729 /* lock alloc mutex */ |
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diff
changeset
|
730 |
538f06aa8118
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1903
diff
changeset
|
731 if (ctx->event) { |
538f06aa8118
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diff
changeset
|
732 ngx_resolver_free_locked(r, ctx->event); |
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diff
changeset
|
733 } |
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diff
changeset
|
734 |
538f06aa8118
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parents:
1903
diff
changeset
|
735 ngx_resolver_free_locked(r, ctx); |
538f06aa8118
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diff
changeset
|
736 |
538f06aa8118
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diff
changeset
|
737 /* unlock alloc mutex */ |
1649 | 738 } |
739 | |
740 | |
741 static void | |
742 ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
743 { | |
744 time_t now; | |
745 ngx_uint_t i; | |
746 ngx_queue_t *q; | |
747 ngx_resolver_node_t *rn; | |
748 | |
749 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire"); | |
750 | |
751 now = ngx_time(); | |
752 | |
753 for (i = 0; i < 2; i++) { | |
754 if (ngx_queue_empty(queue)) { | |
755 return; | |
756 } | |
757 | |
758 q = ngx_queue_last(queue); | |
759 | |
760 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
761 | |
762 if (now <= rn->expire) { | |
763 return; | |
764 } | |
765 | |
1774 | 766 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, |
767 "resolver expire \"%*s\"", (size_t) rn->nlen, rn->name); | |
1649 | 768 |
769 ngx_queue_remove(q); | |
770 | |
771 ngx_rbtree_delete(tree, &rn->node); | |
772 | |
773 ngx_resolver_free_node(r, rn); | |
774 } | |
775 } | |
776 | |
777 | |
778 static ngx_int_t | |
779 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
780 { | |
781 ssize_t n; | |
782 ngx_udp_connection_t *uc; | |
783 | |
784 uc = r->udp_connection; | |
785 | |
786 if (uc->connection == NULL) { | |
787 if (ngx_udp_connect(uc) != NGX_OK) { | |
788 return NGX_ERROR; | |
789 } | |
790 | |
791 uc->connection->data = r; | |
792 uc->connection->read->handler = ngx_resolver_read_response; | |
1906 | 793 uc->connection->read->resolver = 1; |
1649 | 794 } |
795 | |
796 n = ngx_send(uc->connection, rn->query, rn->qlen); | |
797 | |
798 if (n == -1) { | |
799 return NGX_ERROR; | |
800 } | |
801 | |
802 if ((size_t) n != (size_t) rn->qlen) { | |
803 ngx_log_error(NGX_LOG_CRIT, uc->log, 0, "send() incomplete"); | |
804 return NGX_ERROR; | |
805 } | |
806 | |
807 return NGX_OK; | |
808 } | |
809 | |
810 | |
811 static void | |
812 ngx_resolver_resend_handler(ngx_event_t *ev) | |
813 { | |
814 time_t timer, atimer, ntimer; | |
815 ngx_resolver_t *r; | |
816 | |
817 r = ev->data; | |
818 | |
819 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, | |
820 "resolver resend handler"); | |
821 | |
822 /* lock name mutex */ | |
823 | |
824 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue); | |
825 | |
826 /* unlock name mutex */ | |
827 | |
828 /* lock addr mutex */ | |
829 | |
830 atimer = ngx_resolver_resend(r, &r->addr_rbtree, &r->addr_resend_queue); | |
1679
ca317d9b5c09
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1649
diff
changeset
|
831 |
1649 | 832 /* unlock addr mutex */ |
833 | |
834 if (ntimer == 0) { | |
835 timer = atimer; | |
836 | |
837 } else if (atimer == 0) { | |
838 timer = ntimer; | |
839 | |
840 } else { | |
841 timer = (atimer < ntimer) ? atimer : ntimer; | |
842 } | |
843 | |
844 if (timer) { | |
845 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000)); | |
846 } | |
847 } | |
848 | |
849 | |
850 static time_t | |
851 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
852 { | |
853 time_t now; | |
854 ngx_queue_t *q; | |
855 ngx_resolver_node_t *rn; | |
856 | |
857 now = ngx_time(); | |
858 | |
859 for ( ;; ) { | |
860 if (ngx_queue_empty(queue)) { | |
861 return 0; | |
862 } | |
863 | |
864 q = ngx_queue_last(queue); | |
865 | |
866 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
867 | |
868 if (now < rn->expire) { | |
869 return rn->expire - now; | |
870 } | |
871 | |
1774 | 872 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, |
873 "resolver resend \"%*s\" %p", | |
874 (size_t) rn->nlen, rn->name, rn->waiting); | |
1649 | 875 |
876 ngx_queue_remove(q); | |
877 | |
878 if (rn->waiting) { | |
879 | |
880 if (ngx_resolver_send_query(r, rn) == NGX_OK) { | |
881 | |
882 rn->expire = now + r->resend_timeout; | |
883 | |
884 ngx_queue_insert_head(queue, &rn->queue); | |
885 } | |
1879
cf4ee321d195
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1878
diff
changeset
|
886 |
cf4ee321d195
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parents:
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diff
changeset
|
887 continue; |
1649 | 888 } |
889 | |
890 ngx_rbtree_delete(tree, &rn->node); | |
891 | |
892 ngx_resolver_free_node(r, rn); | |
893 } | |
894 } | |
895 | |
896 | |
897 static void | |
898 ngx_resolver_read_response(ngx_event_t *rev) | |
899 { | |
900 ssize_t n; | |
901 ngx_connection_t *c; | |
902 u_char buf[NGX_RESOLVER_UDP_SIZE]; | |
903 | |
904 c = rev->data; | |
905 | |
906 do { | |
1689 | 907 n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE); |
908 | |
909 if (n < 0) { | |
1649 | 910 return; |
911 } | |
912 | |
913 ngx_resolver_process_response(c->data, buf, n); | |
914 | |
915 } while (rev->ready); | |
916 } | |
917 | |
918 | |
919 static void | |
920 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n) | |
921 { | |
922 char *err; | |
923 size_t len; | |
924 ngx_uint_t i, ident, flags, code, nqs, nan, qtype, qclass; | |
925 ngx_resolver_qs_t *qs; | |
926 ngx_resolver_query_t *query; | |
927 | |
928 if ((size_t) n < sizeof(ngx_resolver_query_t) + 1) { | |
929 goto short_response; | |
930 } | |
931 | |
932 query = (ngx_resolver_query_t *) buf; | |
933 | |
934 ident = (query->ident_hi << 8) + query->ident_lo; | |
935 flags = (query->flags_hi << 8) + query->flags_lo; | |
936 nqs = (query->nqs_hi << 8) + query->nqs_lo; | |
937 nan = (query->nan_hi << 8) + query->nan_lo; | |
938 | |
939 ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0, | |
940 "resolver DNS response %d fl:%04Xud %d/%d/%d/%d", | |
941 ident, flags, nqs, nan, | |
942 (query->nns_hi << 8) + query->nns_lo, | |
943 (query->nar_hi << 8) + query->nar_lo); | |
944 | |
945 if (!(flags & 0x8000)) { | |
946 ngx_log_error(r->log_level, r->log, 0, | |
947 "invalid DNS response %d fl:%04Xud", ident, flags); | |
948 return; | |
949 } | |
950 | |
951 code = flags & 0x7f; | |
952 | |
953 if (code == NGX_RESOLVE_FORMERR || code > NGX_RESOLVE_REFUSED) { | |
954 ngx_log_error(r->log_level, r->log, 0, | |
955 "DNS error (%d: %s), query id:%d", | |
956 code, ngx_resolver_strerror(code), ident); | |
957 return; | |
958 } | |
959 | |
960 if (nqs != 1) { | |
961 err = "invalid number of questions in DNS response"; | |
962 goto done; | |
963 } | |
964 | |
965 i = sizeof(ngx_resolver_query_t); | |
966 | |
967 while (i < (ngx_uint_t) n) { | |
968 if (buf[i] == '\0') { | |
969 goto found; | |
970 } | |
971 | |
972 len = buf[i]; | |
973 i += 1 + len; | |
974 } | |
975 | |
976 goto short_response; | |
977 | |
978 found: | |
979 | |
980 if (i++ == 0) { | |
981 err = "zero-length domain name in DNS response"; | |
982 goto done; | |
983 } | |
984 | |
985 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t)) | |
986 > (ngx_uint_t) n) | |
987 { | |
988 goto short_response; | |
989 } | |
990 | |
991 qs = (ngx_resolver_qs_t *) &buf[i]; | |
992 | |
993 qtype = (qs->type_hi << 8) + qs->type_lo; | |
994 qclass = (qs->class_hi << 8) + qs->class_lo; | |
995 | |
996 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
997 "resolver DNS response qt:%d cl:%d", qtype, qclass); | |
998 | |
999 if (qclass != 1) { | |
1000 ngx_log_error(r->log_level, r->log, 0, | |
1001 "unknown query class %d in DNS response", qclass); | |
1002 return; | |
1003 } | |
1004 | |
1005 switch (qtype) { | |
1006 | |
1007 case NGX_RESOLVE_A: | |
1008 | |
1009 ngx_resolver_process_a(r, buf, n, ident, code, nan, | |
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1010 i + sizeof(ngx_resolver_qs_t)); |
1649 | 1011 |
1012 break; | |
1013 | |
1014 case NGX_RESOLVE_PTR: | |
1015 | |
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1016 ngx_resolver_process_ptr(r, buf, n, ident, code, nan); |
1649 | 1017 |
1018 break; | |
1019 | |
1020 default: | |
1021 ngx_log_error(r->log_level, r->log, 0, | |
1022 "unknown query type %d in DNS response", qtype); | |
1023 return; | |
1024 } | |
1025 | |
1026 return; | |
1027 | |
1028 short_response: | |
1029 | |
1030 err = "short dns response"; | |
1031 | |
1032 done: | |
1033 | |
1034 ngx_log_error(r->log_level, r->log, 0, err); | |
1035 | |
1036 return; | |
1037 } | |
1038 | |
1039 | |
1040 static void | |
1041 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last, | |
1042 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans) | |
583 | 1043 { |
1649 | 1044 char *err; |
1045 u_char *cname; | |
1046 size_t len; | |
1047 uint32_t hash; | |
1048 in_addr_t addr, *addrs; | |
1049 ngx_str_t name; | |
1050 ngx_uint_t qtype, qident, naddrs, a, i, n, start; | |
1051 ngx_resolver_an_t *an; | |
1052 ngx_resolver_ctx_t *ctx, *next; | |
1053 ngx_resolver_node_t *rn; | |
1054 | |
1055 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) { | |
1056 return; | |
1057 } | |
1058 | |
1059 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); | |
1060 | |
1061 hash = ngx_crc32_short(name.data, name.len); | |
1062 | |
1063 /* lock name mutex */ | |
1064 | |
1065 rn = ngx_resolver_lookup_name(r, &name, hash); | |
1066 | |
1067 if (rn == NULL || rn->query == NULL) { | |
1068 ngx_log_error(r->log_level, r->log, 0, | |
1069 "unexpected response for %V", &name); | |
1070 goto failed; | |
1071 } | |
1072 | |
1073 qident = (rn->query[0] << 8) + rn->query[1]; | |
1074 | |
1075 if (ident != qident) { | |
1076 ngx_log_error(r->log_level, r->log, 0, | |
1077 "wrong ident %d response for %V, expect %d", | |
1078 ident, &name, qident); | |
1079 goto failed; | |
1080 } | |
1081 | |
1742
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1082 if (code == 0 && nan == 0) { |
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1083 code = 3; /* NXDOMAIN */ |
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|
1084 } |
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1085 |
1649 | 1086 if (code) { |
1087 next = rn->waiting; | |
1088 rn->waiting = NULL; | |
1089 | |
1090 ngx_queue_remove(&rn->queue); | |
1091 | |
1092 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
1093 | |
1094 ngx_resolver_free_node(r, rn); | |
1095 | |
1096 /* unlock name mutex */ | |
1097 | |
1098 while (next) { | |
1099 ctx = next; | |
1100 ctx->state = code; | |
1101 next = ctx->next; | |
1102 | |
1103 ctx->handler(ctx); | |
1104 } | |
1105 | |
1106 return; | |
1107 } | |
1108 | |
1109 i = ans; | |
1110 naddrs = 0; | |
1111 addr = 0; | |
1112 addrs = NULL; | |
1113 cname = NULL; | |
1114 qtype = 0; | |
1115 | |
1116 for (a = 0; a < nan; a++) { | |
1117 | |
1118 start = i; | |
1119 | |
1120 while (i < last) { | |
1121 | |
1122 if (buf[i] & 0xc0) { | |
1123 i += 2; | |
1124 goto found; | |
1125 } | |
1126 | |
1127 if (buf[i] == 0) { | |
1128 i++; | |
1129 goto test_length; | |
1130 } | |
1131 | |
1132 i += 1 + buf[i]; | |
1133 } | |
1134 | |
1135 goto short_response; | |
1136 | |
1137 test_length: | |
1138 | |
1139 if (i - start < 2) { | |
1140 err = "invalid name in dns response"; | |
1141 goto invalid; | |
1142 } | |
1143 | |
1144 found: | |
1145 | |
1146 if (i + sizeof(ngx_resolver_an_t) >= last) { | |
1147 goto short_response; | |
1148 } | |
1149 | |
1150 an = (ngx_resolver_an_t *) &buf[i]; | |
1151 | |
1152 qtype = (an->type_hi << 8) + an->type_lo; | |
1153 len = (an->len_hi << 8) + an->len_lo; | |
1154 | |
1155 if (qtype == NGX_RESOLVE_A) { | |
1156 | |
1157 i += sizeof(ngx_resolver_an_t); | |
1158 | |
1159 if (i + len > last) { | |
1160 goto short_response; | |
1161 } | |
1162 | |
1163 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
1164 + (buf[i + 2] << 8) + (buf[i + 3])); | |
1165 | |
1166 naddrs++; | |
1167 | |
1168 i += len; | |
1169 | |
1170 } else if (qtype == NGX_RESOLVE_CNAME) { | |
1171 cname = &buf[i] + sizeof(ngx_resolver_an_t); | |
1172 i += sizeof(ngx_resolver_an_t) + len; | |
1173 } | |
1174 } | |
1175 | |
1176 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1177 "resolver naddrs:%ui cname:%p", naddrs, cname); | |
1178 | |
1179 if (naddrs) { | |
1180 | |
1181 if (naddrs == 1) { | |
1182 rn->u.addr = addr; | |
1183 | |
1184 } else { | |
1185 | |
1186 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t)); | |
1187 if (addrs == NULL) { | |
1188 return; | |
1189 } | |
1190 | |
1191 n = 0; | |
1192 i = ans; | |
1193 | |
1194 for (a = 0; a < nan; a++) { | |
1195 | |
1196 for ( ;; ) { | |
1197 | |
1198 if (buf[i] & 0xc0) { | |
1199 i += 2; | |
1200 goto ok; | |
1201 } | |
1202 | |
1203 if (buf[i] == 0) { | |
1204 i++; | |
1205 goto ok; | |
1206 } | |
1207 | |
1208 i += 1 + buf[i]; | |
1209 } | |
1210 | |
1211 ok: | |
1212 | |
1213 an = (ngx_resolver_an_t *) &buf[i]; | |
1214 | |
1215 qtype = (an->type_hi << 8) + an->type_lo; | |
1216 len = (an->len_hi << 8) + an->len_lo; | |
1217 | |
1218 i += sizeof(ngx_resolver_an_t); | |
1219 | |
1220 if (qtype == NGX_RESOLVE_A) { | |
1221 | |
1222 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
1223 + (buf[i + 2] << 8) + (buf[i + 3])); | |
1224 | |
1225 if (n == naddrs) { | |
1226 break; | |
1227 } | |
1228 } | |
1229 | |
1230 i += len; | |
1231 } | |
1232 | |
1233 rn->u.addrs = addrs; | |
1234 | |
1235 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
1236 naddrs * sizeof(in_addr_t)); | |
1237 if (addrs == NULL) { | |
1238 return; | |
1239 } | |
1240 } | |
1241 | |
1242 rn->naddrs = (u_short) naddrs; | |
1243 | |
1244 ngx_queue_remove(&rn->queue); | |
1245 | |
1246 rn->valid = ngx_time() + r->valid; | |
1247 rn->expire = ngx_time() + r->expire; | |
1248 | |
1249 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
1250 | |
1251 next = rn->waiting; | |
1252 rn->waiting = NULL; | |
1253 | |
1254 /* unlock name mutex */ | |
1255 | |
1256 while (next) { | |
1257 ctx = next; | |
1258 ctx->state = NGX_OK; | |
1259 ctx->naddrs = naddrs; | |
1260 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
1261 ctx->addr = addr; | |
1262 next = ctx->next; | |
1263 | |
1264 ctx->handler(ctx); | |
1265 } | |
1266 | |
1267 if (naddrs) { | |
1268 ngx_resolver_free(r, addrs); | |
1269 } | |
1270 | |
1271 return; | |
1272 | |
1273 } else if (cname) { | |
1274 | |
1275 /* CNAME only */ | |
1276 | |
1277 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) { | |
1278 return; | |
1279 } | |
1280 | |
1281 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1282 "resolver cname:\"%V\"", &name); | |
1283 | |
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diff
changeset
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1284 ngx_queue_remove(&rn->queue); |
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changeset
|
1285 |
1649 | 1286 rn->cnlen = (u_short) name.len; |
1287 rn->u.cname = name.data; | |
1288 rn->valid = ngx_time() + r->valid; | |
1289 rn->expire = ngx_time() + r->expire; | |
1290 | |
1291 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
1292 | |
1293 ctx = rn->waiting; | |
1294 rn->waiting = NULL; | |
1295 | |
1296 if (ctx) { | |
1297 ctx->name = name; | |
1298 | |
1299 (void) ngx_resolve_name_locked(r, ctx); | |
1300 } | |
1301 | |
1302 return; | |
1303 } | |
1304 | |
1305 ngx_log_error(r->log_level, r->log, 0, | |
1306 "no A or CNAME types in DNS responses, unknown query type: %d", | |
1307 qtype); | |
1308 return; | |
1309 | |
1310 short_response: | |
1311 | |
1312 err = "short dns response"; | |
1313 | |
1314 invalid: | |
1315 | |
1316 /* unlock name mutex */ | |
1317 | |
1318 ngx_log_error(r->log_level, r->log, 0, err); | |
1319 | |
1320 return; | |
1321 | |
1322 failed: | |
1323 | |
1324 /* unlock name mutex */ | |
1325 | |
1326 return; | |
1327 } | |
1328 | |
1329 | |
1330 static void | |
1331 ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, | |
1742
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|
1332 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan) |
1649 | 1333 { |
1334 char *err; | |
1335 size_t len; | |
1336 in_addr_t addr; | |
1337 ngx_int_t digit; | |
1338 ngx_str_t name; | |
1339 ngx_uint_t i, mask, qtype, qclass, qident; | |
1340 ngx_resolver_an_t *an; | |
1341 ngx_resolver_ctx_t *ctx, *next; | |
1342 ngx_resolver_node_t *rn; | |
1343 | |
1344 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) { | |
1345 goto invalid_in_addr_arpa; | |
1346 } | |
1347 | |
1348 addr = 0; | |
1349 i = 12; | |
1350 | |
1351 for (mask = 0; mask < 32; mask += 8) { | |
1352 len = buf[i++]; | |
1353 | |
1354 digit = ngx_atoi(&buf[i], len); | |
1355 if (digit == NGX_ERROR || digit > 255) { | |
1356 goto invalid_in_addr_arpa; | |
1357 } | |
1358 | |
1359 addr += digit << mask; | |
1360 i += len; | |
1361 } | |
1362 | |
1363 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) { | |
1364 goto invalid_in_addr_arpa; | |
1365 } | |
1366 | |
1367 /* lock addr mutex */ | |
1368 | |
1369 rn = ngx_resolver_lookup_addr(r, addr); | |
1370 | |
1371 if (rn == NULL || rn->query == NULL) { | |
1372 ngx_log_error(r->log_level, r->log, 0, | |
1373 "unexpected response for %ud.%ud.%ud.%ud", | |
1374 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
1375 (addr >> 8) & 0xff, addr & 0xff); | |
1376 goto failed; | |
1377 } | |
1378 | |
1379 qident = (rn->query[0] << 8) + rn->query[1]; | |
1380 | |
1381 if (ident != qident) { | |
1382 ngx_log_error(r->log_level, r->log, 0, | |
1383 "wrong ident %d response for %ud.%ud.%ud.%ud, expect %d", | |
1384 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
1385 (addr >> 8) & 0xff, addr & 0xff, qident); | |
1386 goto failed; | |
1387 } | |
1388 | |
1742
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no answers in DNS response should be NXDOMAIN
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parents:
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diff
changeset
|
1389 if (code == 0 && nan == 0) { |
268b81386fe4
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parents:
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diff
changeset
|
1390 code = 3; /* NXDOMAIN */ |
268b81386fe4
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diff
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|
1391 } |
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diff
changeset
|
1392 |
1649 | 1393 if (code) { |
1394 next = rn->waiting; | |
1395 rn->waiting = NULL; | |
1396 | |
1397 ngx_queue_remove(&rn->queue); | |
1398 | |
1399 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
1400 | |
1401 ngx_resolver_free_node(r, rn); | |
1402 | |
1403 /* unlock addr mutex */ | |
1404 | |
1405 while (next) { | |
1406 ctx = next; | |
1407 ctx->state = code; | |
1408 next = ctx->next; | |
1409 | |
1410 ctx->handler(ctx); | |
1411 } | |
1412 | |
1413 return; | |
1414 } | |
1415 | |
1416 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t); | |
1417 | |
1418 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) { | |
1419 goto short_response; | |
1420 } | |
1421 | |
1422 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */ | |
1423 | |
1424 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) { | |
1425 err = "invalid in-addr.arpa name in DNS response"; | |
1426 goto invalid; | |
1427 } | |
1428 | |
1429 an = (ngx_resolver_an_t *) &buf[i + 2]; | |
1430 | |
1431 qtype = (an->type_hi << 8) + an->type_lo; | |
1432 qclass = (an->class_hi << 8) + an->class_lo; | |
1433 len = (an->len_hi << 8) + an->len_lo; | |
1434 | |
1435 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1436 "resolver qt:%d cl:%d len:%uz", qtype, qclass, len); | |
1437 | |
1438 i += 2 + sizeof(ngx_resolver_an_t); | |
1439 | |
1440 if (i + len > (ngx_uint_t) n) { | |
1441 goto short_response; | |
1442 } | |
1443 | |
1444 len -= 2; | |
1445 | |
1446 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) { | |
1447 return; | |
1448 } | |
1449 | |
1450 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name); | |
1451 | |
1452 if (len != (size_t) rn->nlen || ngx_strncmp(name.data, rn->name, len) != 0) | |
1453 { | |
1454 ngx_resolver_free(r, rn->name); | |
1455 rn->name = name.data; | |
1456 | |
1457 name.data = ngx_resolver_dup(r, rn->name, len); | |
1458 if (name.data == NULL) { | |
1459 goto failed; | |
1460 } | |
1461 } | |
1462 | |
1463 ngx_queue_remove(&rn->queue); | |
1464 | |
1465 rn->valid = ngx_time() + r->valid; | |
1466 rn->expire = ngx_time() + r->expire; | |
1467 | |
1468 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
1469 | |
1470 next = rn->waiting; | |
1471 rn->waiting = NULL; | |
1472 | |
1473 /* unlock addr mutex */ | |
1474 | |
1475 while (next) { | |
1476 ctx = next; | |
1477 ctx->state = NGX_OK; | |
1478 ctx->name = name; | |
1479 next = ctx->next; | |
1480 | |
1481 ctx->handler(ctx); | |
1482 } | |
1483 | |
1484 ngx_resolver_free(r, name.data); | |
1485 | |
1486 return; | |
1487 | |
1488 invalid_in_addr_arpa: | |
1489 | |
1490 ngx_log_error(r->log_level, r->log, 0, | |
1491 "invalid in-addr.arpa name in DNS response"); | |
1492 return; | |
1493 | |
1494 short_response: | |
1495 | |
1496 err = "short DNS response"; | |
1497 | |
1498 invalid: | |
1499 | |
1500 /* unlock addr mutex */ | |
1501 | |
1502 ngx_log_error(r->log_level, r->log, 0, err); | |
1503 | |
1504 return; | |
1505 | |
1506 failed: | |
1507 | |
1508 /* unlock addr mutex */ | |
1509 | |
1510 return; | |
1511 } | |
1512 | |
1513 | |
1514 static ngx_resolver_node_t * | |
1515 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) | |
1516 { | |
1517 ngx_int_t rc; | |
1518 size_t len; | |
1519 ngx_rbtree_node_t *node, *sentinel; | |
1520 ngx_resolver_node_t *rn; | |
1521 | |
1522 node = r->name_rbtree.root; | |
1523 sentinel = r->name_rbtree.sentinel; | |
1524 | |
1525 while (node != sentinel) { | |
1526 | |
1527 if (hash < node->key) { | |
1528 node = node->left; | |
1529 continue; | |
1530 } | |
1531 | |
1532 if (hash > node->key) { | |
1533 node = node->right; | |
1534 continue; | |
1535 } | |
1536 | |
1537 /* hash == node->key */ | |
1538 | |
1539 do { | |
1540 rn = (ngx_resolver_node_t *) node; | |
1541 | |
1542 len = (name->len > (size_t) rn->nlen) ? rn->nlen : name->len; | |
1543 | |
1544 rc = ngx_strncmp(name->data, rn->name, len); | |
1545 | |
1546 if (rc == 0) { | |
1547 return rn; | |
1548 } | |
1549 | |
1550 node = (rc < 0) ? node->left : node->right; | |
1551 | |
1552 } while (node != sentinel && hash == node->key); | |
1553 | |
1554 break; | |
1555 } | |
1556 | |
1557 /* not found */ | |
1558 | |
1559 return NULL; | |
1560 } | |
1561 | |
1562 | |
1563 static ngx_resolver_node_t * | |
1564 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr) | |
1565 { | |
1566 ngx_rbtree_node_t *node, *sentinel; | |
1567 | |
1568 node = r->addr_rbtree.root; | |
1569 sentinel = r->addr_rbtree.sentinel; | |
1570 | |
1571 while (node != sentinel) { | |
1572 | |
1573 if (addr < node->key) { | |
1574 node = node->left; | |
1575 continue; | |
1576 } | |
1577 | |
1578 if (addr > node->key) { | |
1579 node = node->right; | |
1580 continue; | |
1581 } | |
1582 | |
1583 /* addr == node->key */ | |
1584 | |
1585 return (ngx_resolver_node_t *) node; | |
1586 } | |
1587 | |
1588 /* not found */ | |
1589 | |
1590 return NULL; | |
1591 } | |
1592 | |
1593 | |
1594 static void | |
1595 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
1596 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
1597 { | |
1598 size_t len; | |
1599 ngx_rbtree_node_t **p; | |
1600 ngx_resolver_node_t *rn, *rn_temp; | |
1601 | |
1602 for ( ;; ) { | |
1603 | |
1604 if (node->key < temp->key) { | |
1605 | |
1606 p = &temp->left; | |
1607 | |
1608 } else if (node->key > temp->key) { | |
1609 | |
1610 p = &temp->right; | |
1611 | |
1612 } else { /* node->key == temp->key */ | |
1613 | |
1614 rn = (ngx_resolver_node_t *) node; | |
1615 rn_temp = (ngx_resolver_node_t *) temp; | |
1616 | |
1617 len = (rn->nlen > rn_temp->nlen) ? rn_temp->nlen : rn->nlen; | |
1618 | |
1619 p = (ngx_strncmp(rn->name, rn_temp->name, len) < 0) | |
1620 ? &temp->left : &temp->right; | |
1621 } | |
1622 | |
1623 if (*p == sentinel) { | |
1624 break; | |
1625 } | |
1626 | |
1627 temp = *p; | |
1628 } | |
1629 | |
1630 *p = node; | |
1631 node->parent = temp; | |
1632 node->left = sentinel; | |
1633 node->right = sentinel; | |
1634 ngx_rbt_red(node); | |
1635 } | |
1636 | |
1637 | |
1638 static ngx_int_t | |
1639 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
1640 { | |
1641 u_char *p, *s; | |
1642 size_t len; | |
1643 ngx_uint_t ident; | |
1644 ngx_resolver_qs_t *qs; | |
1645 ngx_resolver_query_t *query; | |
1646 | |
1647 len = sizeof(ngx_resolver_query_t) | |
1648 + 1 + ctx->name.len + 1 + sizeof(ngx_resolver_qs_t); | |
1649 | |
1650 p = ngx_resolver_calloc(ctx->resolver, len); | |
1651 if (p == NULL) { | |
1652 return NGX_ERROR; | |
1653 } | |
1654 | |
1655 rn->qlen = (u_short) len; | |
1656 rn->query = p; | |
1657 | |
1658 query = (ngx_resolver_query_t *) p; | |
1659 | |
1660 ident = ngx_random(); | |
1661 | |
1662 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0, | |
1663 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff); | |
1664 | |
1665 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
1666 query->ident_lo = (u_char) (ident & 0xff); | |
1667 | |
1668 /* recursion query */ | |
1669 query->flags_hi = 1; query->flags_lo = 0; | |
1670 | |
1671 /* one question */ | |
1672 query->nqs_hi = 0; query->nqs_lo = 1; | |
1673 query->nan_hi = 0; query->nan_lo = 0; | |
1674 query->nns_hi = 0; query->nns_lo = 0; | |
1675 query->nar_hi = 0; query->nar_lo = 0; | |
1676 | |
1677 p += sizeof(ngx_resolver_query_t) + 1 + ctx->name.len + 1; | |
1678 | |
1679 qs = (ngx_resolver_qs_t *) p; | |
1680 | |
1681 /* query type */ | |
1682 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type; | |
1683 | |
1684 /* IP query class */ | |
1685 qs->class_hi = 0; qs->class_lo = 1; | |
1686 | |
1687 /* convert "www.example.com" to "\3www\7example\3com\0" */ | |
1688 | |
1689 len = 0; | |
1690 p--; | |
1691 *p-- = '\0'; | |
1692 | |
1693 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) { | |
1694 if (*s != '.') { | |
1695 *p = *s; | |
1696 len++; | |
1697 | |
1698 } else { | |
1699 *p = (u_char) len; | |
1700 len = 0; | |
1701 } | |
1702 | |
1703 p--; | |
1704 } | |
1705 | |
1706 *p = (u_char) len; | |
1707 | |
1708 return NGX_OK; | |
1709 } | |
1710 | |
1711 | |
1712 /* AF_INET only */ | |
1713 | |
1714 static ngx_int_t | |
1715 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
1716 { | |
1717 u_char *p, *d; | |
1718 size_t len; | |
1719 ngx_int_t n; | |
1720 ngx_uint_t ident; | |
1721 ngx_resolver_query_t *query; | |
1722 | |
1723 len = sizeof(ngx_resolver_query_t) | |
1724 + sizeof(".255.255.255.255.in-addr.arpa.") - 1 | |
1725 + sizeof(ngx_resolver_qs_t); | |
1726 | |
1727 p = ngx_resolver_calloc(ctx->resolver, len); | |
1728 if (p == NULL) { | |
1729 return NGX_ERROR; | |
1730 } | |
1731 | |
1732 rn->query = p; | |
1733 query = (ngx_resolver_query_t *) p; | |
1734 | |
1735 ident = ngx_random(); | |
1736 | |
1737 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
1738 query->ident_lo = (u_char) (ident & 0xff); | |
1739 | |
1740 /* recursion query */ | |
1741 query->flags_hi = 1; query->flags_lo = 0; | |
1742 | |
1743 /* one question */ | |
1744 query->nqs_hi = 0; query->nqs_lo = 1; | |
1745 query->nan_hi = 0; query->nan_lo = 0; | |
1746 query->nns_hi = 0; query->nns_lo = 0; | |
1747 query->nar_hi = 0; query->nar_lo = 0; | |
1748 | |
1749 p += sizeof(ngx_resolver_query_t); | |
1750 | |
1751 for (n = 0; n < 32; n += 8){ | |
1752 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff); | |
1753 *p = (u_char) (d - &p[1]); | |
1754 p = d; | |
1755 } | |
1756 | |
1757 /* query type "PTR", IP query class */ | |
1758 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18); | |
1759 | |
1760 rn->qlen = (u_short) | |
1761 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t) | |
1762 - rn->query); | |
1763 | |
1764 return NGX_OK; | |
1765 } | |
1766 | |
1767 | |
1768 static ngx_int_t | |
1769 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src, | |
1770 u_char *last) | |
1771 { | |
1772 char *err; | |
1773 u_char *p, *dst; | |
1774 ssize_t len; | |
1775 ngx_uint_t i, n; | |
1776 | |
1777 p = src; | |
1778 len = -1; | |
1779 | |
1780 /* | |
1781 * compression pointers allow to create endless loop, so we set limit; | |
1782 * 128 pointers should be enough to store 255-byte name | |
1783 */ | |
1784 | |
1785 for (i = 0; i < 128; i++) { | |
1786 n = *p++; | |
1787 | |
1788 if (n == 0) { | |
1789 goto done; | |
1790 } | |
1791 | |
1792 if (n & 0xc0) { | |
1793 n = (n & 0x3f << 8) + *p; | |
1794 p = &buf[n]; | |
1795 | |
1796 } else { | |
1797 len += 1 + n; | |
1798 p = &p[n]; | |
1799 } | |
1800 | |
1801 if (p >= last) { | |
1802 err = "name is out of response"; | |
1803 goto invalid; | |
1804 } | |
1805 } | |
1806 | |
1807 err = "compression pointers loop"; | |
1808 | |
1809 invalid: | |
1810 | |
1811 ngx_log_error(r->log_level, r->log, 0, err); | |
1812 | |
1813 return NGX_ERROR; | |
1814 | |
1815 done: | |
1816 | |
1817 if (name == NULL) { | |
583 | 1818 return NGX_OK; |
1819 } | |
1820 | |
1649 | 1821 dst = ngx_resolver_alloc(r, len); |
1822 if (dst == NULL) { | |
1823 return NGX_ERROR; | |
1824 } | |
1825 | |
1826 name->data = dst; | |
1827 | |
1828 n = *src++; | |
1829 | |
1830 for ( ;; ) { | |
1831 if (n != 0xc0) { | |
1832 ngx_memcpy(dst, src, n); | |
1833 dst += n; | |
1834 src += n; | |
1835 | |
1836 n = *src++; | |
1837 | |
1838 if (n != 0) { | |
1839 *dst++ = '.'; | |
1840 } | |
1841 | |
1842 } else { | |
1843 n = (n & 0x3f << 8) + *src; | |
1844 src = &buf[n]; | |
1845 | |
1846 n = *src++; | |
1847 } | |
1848 | |
1849 if (n == 0) { | |
1850 name->len = dst - name->data; | |
1851 return NGX_OK; | |
1852 } | |
1853 } | |
1854 } | |
1855 | |
1856 | |
1857 static void | |
1858 ngx_resolver_timeout_handler(ngx_event_t *ev) | |
1859 { | |
1860 ngx_resolver_ctx_t *ctx; | |
1861 | |
1862 ctx = ev->data; | |
1863 | |
1864 ctx->state = NGX_RESOLVE_TIMEDOUT; | |
1865 | |
1866 ctx->handler(ctx); | |
1867 } | |
1868 | |
1869 | |
1870 static void | |
1871 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
1872 { | |
1873 /* lock alloc mutex */ | |
1874 | |
1875 if (rn->query) { | |
1876 ngx_resolver_free_locked(r, rn->query); | |
1877 } | |
1878 | |
1879 if (rn->name) { | |
1880 ngx_resolver_free_locked(r, rn->name); | |
1881 } | |
1882 | |
1883 if (rn->cnlen) { | |
1884 ngx_resolver_free_locked(r, rn->u.cname); | |
1885 } | |
1886 | |
1887 if (rn->naddrs > 1) { | |
1888 ngx_resolver_free_locked(r, rn->u.addrs); | |
1889 } | |
1890 | |
1891 ngx_resolver_free_locked(r, rn); | |
1892 | |
1893 /* unlock alloc mutex */ | |
1894 } | |
1895 | |
1896 | |
1897 static void * | |
1898 ngx_resolver_alloc(ngx_resolver_t *r, size_t size) | |
1899 { | |
1900 u_char *p; | |
1901 | |
1902 /* lock alloc mutex */ | |
1903 | |
1904 p = ngx_alloc(size, r->log); | |
1905 | |
1906 /* unlock alloc mutex */ | |
1907 | |
1908 return p; | |
1909 } | |
1910 | |
1911 | |
1903 | 1912 static void * |
1649 | 1913 ngx_resolver_calloc(ngx_resolver_t *r, size_t size) |
1914 { | |
1915 u_char *p; | |
1916 | |
1917 p = ngx_resolver_alloc(r, size); | |
1918 | |
1919 if (p) { | |
1920 ngx_memzero(p, size); | |
1921 } | |
1922 | |
1923 return p; | |
1924 } | |
1925 | |
1926 | |
1927 static void | |
1928 ngx_resolver_free(ngx_resolver_t *r, void *p) | |
1929 { | |
1930 /* lock alloc mutex */ | |
1931 | |
1932 ngx_free(p); | |
1933 | |
1934 /* unlock alloc mutex */ | |
1935 } | |
1936 | |
1937 | |
1938 static void | |
1939 ngx_resolver_free_locked(ngx_resolver_t *r, void *p) | |
1940 { | |
1941 ngx_free(p); | |
1942 } | |
1943 | |
1944 | |
1945 static void * | |
1946 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size) | |
1947 { | |
1948 void *dst; | |
1949 | |
1950 dst = ngx_resolver_alloc(r, size); | |
1951 | |
1952 if (dst == NULL) { | |
1953 return dst; | |
1954 } | |
1955 | |
1956 ngx_memcpy(dst, src, size); | |
1957 | |
1958 return dst; | |
1959 } | |
1960 | |
1961 | |
1962 char * | |
1963 ngx_resolver_strerror(ngx_int_t err) | |
1964 { | |
1965 static char *errors[] = { | |
1966 "Format error", /* FORMERR */ | |
1967 "Server failure", /* SERVFAIL */ | |
1968 "Host not found", /* NXDOMAIN */ | |
1969 "Unimplemented", /* NOTIMP */ | |
1970 "Operation refused" /* REFUSED */ | |
1971 }; | |
1972 | |
1973 if (err > 0 && err < 6) { | |
1974 return errors[err - 1]; | |
1975 } | |
1976 | |
1977 if (err == NGX_RESOLVE_TIMEDOUT) { | |
1978 return "Operation timed out"; | |
1979 } | |
1980 | |
1981 return "Unknown error"; | |
1982 } | |
1983 | |
1984 | |
1985 ngx_int_t | |
1986 ngx_udp_connect(ngx_udp_connection_t *uc) | |
1987 { | |
1988 int rc; | |
1989 ngx_int_t event; | |
1990 ngx_event_t *rev, *wev; | |
1991 ngx_socket_t s; | |
1992 ngx_connection_t *c; | |
1993 | |
583 | 1994 s = ngx_socket(AF_INET, SOCK_DGRAM, 0); |
1995 | |
1649 | 1996 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, uc->log, 0, "UDP socket %d", s); |
583 | 1997 |
1998 if (s == -1) { | |
1649 | 1999 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
583 | 2000 ngx_socket_n " failed"); |
2001 return NGX_ERROR; | |
2002 } | |
2003 | |
1649 | 2004 c = ngx_get_connection(s, uc->log); |
583 | 2005 |
2006 if (c == NULL) { | |
2007 if (ngx_close_socket(s) == -1) { | |
1649 | 2008 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
583 | 2009 ngx_close_socket_n "failed"); |
2010 } | |
2011 | |
2012 return NGX_ERROR; | |
2013 } | |
2014 | |
1649 | 2015 if (ngx_nonblocking(s) == -1) { |
2016 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
2017 ngx_nonblocking_n " failed"); | |
2018 | |
2019 ngx_free_connection(c); | |
2020 | |
2021 if (ngx_close_socket(s) == -1) { | |
2022 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
2023 ngx_close_socket_n " failed"); | |
2024 } | |
2025 | |
2026 return NGX_ERROR; | |
2027 } | |
2028 | |
583 | 2029 rev = c->read; |
2030 wev = c->write; | |
2031 | |
1649 | 2032 rev->log = uc->log; |
2033 wev->log = uc->log; | |
2034 | |
2035 uc->connection = c; | |
583 | 2036 |
2037 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); | |
2038 | |
2039 #if (NGX_THREADS) | |
1649 | 2040 |
2041 /* TODO: lock event when call completion handler */ | |
2042 | |
2043 rev->lock = &c->lock; | |
2044 wev->lock = &c->lock; | |
583 | 2045 rev->own_lock = &c->lock; |
2046 wev->own_lock = &c->lock; | |
1649 | 2047 |
583 | 2048 #endif |
2049 | |
1649 | 2050 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, uc->log, 0, |
2051 "connect to %V, fd:%d #%d", &uc->server, s, c->number); | |
2052 | |
2053 rc = connect(s, uc->sockaddr, uc->socklen); | |
2054 | |
2055 /* TODO: aio, iocp */ | |
583 | 2056 |
2057 if (rc == -1) { | |
1649 | 2058 ngx_log_error(NGX_LOG_CRIT, uc->log, ngx_socket_errno, |
2059 "connect() to %V failed", &uc->server); | |
583 | 2060 |
2061 return NGX_ERROR; | |
2062 } | |
2063 | |
1649 | 2064 /* UDP sockets are always ready to write */ |
2065 wev->ready = 1; | |
2066 | |
2067 if (ngx_add_event) { | |
2068 | |
2069 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ? | |
2070 /* kqueue, epoll */ NGX_CLEAR_EVENT: | |
2071 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT; | |
2072 /* eventport event type has no meaning: oneshot only */ | |
2073 | |
2074 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { | |
2075 return NGX_ERROR; | |
2076 } | |
2077 | |
2078 } else { | |
2079 /* rtsig */ | |
2080 | |
583 | 2081 if (ngx_add_conn(c) == NGX_ERROR) { |
2082 return NGX_ERROR; | |
2083 } | |
2084 } | |
2085 | |
2086 return NGX_OK; | |
2087 } |