Mercurial > hg > nginx
annotate src/core/ngx_resolver.c @ 1904:538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Thu, 28 Feb 2008 20:09:39 +0000 |
parents | 1ea922585517 |
children | 4a8c9139e579 |
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, | |
1742
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70 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans); |
1649 | 71 static void ngx_resolver_process_ptr(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); |
1649 | 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); | |
1903 | 84 static void *ngx_resolver_calloc(ngx_resolver_t *r, size_t size); |
1649 | 85 static void ngx_resolver_free(ngx_resolver_t *r, void *p); |
86 static void ngx_resolver_free_locked(ngx_resolver_t *r, void *p); | |
87 static void *ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size); | |
88 | |
89 | |
90 /* STUB: ngx_peer_addr_t * */ | |
91 | |
92 ngx_resolver_t * | |
93 ngx_resolver_create(ngx_peer_addr_t *addr, ngx_log_t *log) | |
94 { | |
95 ngx_resolver_t *r; | |
96 ngx_udp_connection_t *uc; | |
97 | |
98 r = ngx_calloc(sizeof(ngx_resolver_t), log); | |
99 if (r == NULL) { | |
100 return NULL; | |
101 } | |
102 | |
103 r->event = ngx_calloc(sizeof(ngx_event_t), log); | |
104 if (r->event == NULL) { | |
105 return NULL; | |
106 } | |
107 | |
1687 | 108 ngx_rbtree_init(&r->name_rbtree, &r->name_sentinel, |
109 ngx_resolver_rbtree_insert_value); | |
110 | |
111 ngx_rbtree_init(&r->addr_rbtree, &r->addr_sentinel, | |
112 ngx_rbtree_insert_value); | |
1649 | 113 |
1685 | 114 ngx_queue_init(&r->name_resend_queue); |
115 ngx_queue_init(&r->addr_resend_queue); | |
116 | |
117 ngx_queue_init(&r->name_expire_queue); | |
118 ngx_queue_init(&r->addr_expire_queue); | |
1649 | 119 |
120 r->event->handler = ngx_resolver_resend_handler; | |
121 r->event->data = r; | |
122 r->event->log = log; | |
123 r->ident = -1; | |
124 | |
125 r->resend_timeout = 5; | |
126 r->expire = 30; | |
127 r->valid = 300; | |
128 | |
129 r->log = log; | |
130 r->log_level = NGX_LOG_ALERT; | |
131 | |
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132 if (addr) { |
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133 uc = ngx_calloc(sizeof(ngx_udp_connection_t), log); |
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134 if (uc == NULL) { |
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135 return NULL; |
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136 } |
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137 |
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138 r->udp_connection = uc; |
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139 |
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140 uc->sockaddr = addr->sockaddr; |
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141 uc->socklen = addr->socklen; |
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142 uc->server = addr->name; |
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143 uc->log = log; |
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144 } |
1649 | 145 |
146 return r; | |
147 } | |
148 | |
149 | |
150 ngx_resolver_ctx_t * | |
151 ngx_resolve_start(ngx_resolver_t *r, ngx_resolver_ctx_t *temp) | |
152 { | |
153 in_addr_t addr; | |
154 ngx_resolver_ctx_t *ctx; | |
155 | |
156 if (temp) { | |
157 addr = ngx_inet_addr(temp->name.data, temp->name.len); | |
158 | |
159 if (addr != INADDR_NONE) { | |
160 temp->resolver = r; | |
161 temp->state = NGX_OK; | |
162 temp->naddrs = 1; | |
163 temp->addrs = &temp->addr; | |
164 temp->addr = addr; | |
165 temp->quick = 1; | |
166 | |
167 return temp; | |
168 } | |
169 } | |
170 | |
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171 if (r->udp_connection == NULL) { |
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172 return NGX_NO_RESOLVER; |
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173 } |
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174 |
1649 | 175 ctx = ngx_resolver_calloc(r, sizeof(ngx_resolver_ctx_t)); |
176 | |
177 if (ctx) { | |
178 ctx->resolver = r; | |
179 } | |
180 | |
181 return ctx; | |
182 } | |
183 | |
184 | |
185 ngx_int_t | |
186 ngx_resolve_name(ngx_resolver_ctx_t *ctx) | |
187 { | |
188 ngx_int_t rc; | |
189 ngx_resolver_t *r; | |
190 | |
191 r = ctx->resolver; | |
192 | |
193 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
194 "resolve: \"%V\"", &ctx->name); | |
195 | |
196 if (ctx->quick) { | |
197 ctx->handler(ctx); | |
198 return NGX_OK; | |
199 } | |
200 | |
201 /* lock name mutex */ | |
202 | |
203 rc = ngx_resolve_name_locked(r, ctx); | |
204 | |
205 if (rc == NGX_OK) { | |
206 return NGX_OK; | |
207 } | |
208 | |
209 /* unlock name mutex */ | |
210 | |
211 if (rc == NGX_AGAIN) { | |
212 return NGX_OK; | |
213 } | |
214 | |
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215 /* NGX_ERROR */ |
1649 | 216 |
217 if (ctx->event) { | |
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218 ngx_resolver_free(r, ctx->event); |
1649 | 219 } |
220 | |
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221 ngx_resolver_free(r, ctx); |
1649 | 222 |
223 return NGX_ERROR; | |
224 } | |
225 | |
226 | |
227 void | |
228 ngx_resolve_name_done(ngx_resolver_ctx_t *ctx) | |
229 { | |
230 uint32_t hash; | |
231 ngx_resolver_t *r; | |
232 ngx_resolver_ctx_t *w, **p; | |
233 ngx_resolver_node_t *rn; | |
234 | |
235 r = ctx->resolver; | |
236 | |
237 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
238 "resolve name done: %i", ctx->state); | |
239 | |
240 if (ctx->quick) { | |
241 return; | |
242 } | |
243 | |
244 if (ctx->event && ctx->event->timer_set) { | |
245 ngx_del_timer(ctx->event); | |
246 } | |
247 | |
248 /* lock name mutex */ | |
249 | |
250 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
251 | |
252 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
253 | |
254 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
255 | |
256 if (rn) { | |
257 p = &rn->waiting; | |
258 w = rn->waiting; | |
259 | |
260 while (w) { | |
261 if (w == ctx) { | |
262 *p = w->next; | |
263 | |
264 goto done; | |
265 } | |
266 | |
267 p = &w->next; | |
268 w = w->next; | |
269 } | |
270 } | |
271 | |
272 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
273 "could not cancel %V resolving", &ctx->name); | |
274 } | |
275 | |
276 done: | |
277 | |
278 ngx_resolver_expire(r, &r->name_rbtree, &r->name_expire_queue); | |
279 | |
280 /* unlock name mutex */ | |
281 | |
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282 /* lock alloc mutex */ |
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283 |
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284 if (ctx->event) { |
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285 ngx_resolver_free_locked(r, ctx->event); |
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286 } |
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287 |
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288 ngx_resolver_free_locked(r, ctx); |
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289 |
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290 /* unlock alloc mutex */ |
1649 | 291 } |
292 | |
293 | |
294 /* NGX_RESOLVE_A only */ | |
295 | |
296 static ngx_int_t | |
297 ngx_resolve_name_locked(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx) | |
298 { | |
299 uint32_t hash; | |
300 in_addr_t addr, *addrs; | |
301 ngx_uint_t naddrs; | |
302 ngx_resolver_ctx_t *next; | |
303 ngx_resolver_node_t *rn; | |
304 | |
305 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
306 | |
307 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
308 | |
309 if (rn) { | |
310 | |
311 if (rn->valid >= ngx_time()) { | |
312 | |
313 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
314 | |
315 ngx_queue_remove(&rn->queue); | |
316 | |
317 rn->expire = ngx_time() + r->expire; | |
318 | |
319 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
320 | |
321 naddrs = rn->naddrs; | |
322 | |
323 if (naddrs) { | |
324 | |
325 /* NGX_RESOLVE_A answer */ | |
326 | |
327 if (naddrs != 1) { | |
328 addr = 0; | |
329 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
330 naddrs * sizeof(in_addr_t)); | |
331 if (addrs == NULL) { | |
332 return NGX_ERROR; | |
333 } | |
334 | |
335 } else { | |
336 addr = rn->u.addr; | |
337 addrs = NULL; | |
338 } | |
339 | |
340 ctx->next = rn->waiting; | |
341 rn->waiting = NULL; | |
342 | |
343 /* unlock name mutex */ | |
344 | |
345 do { | |
346 ctx->state = NGX_OK; | |
347 ctx->naddrs = naddrs; | |
348 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
349 ctx->addr = addr; | |
350 next = ctx->next; | |
351 | |
352 ctx->handler(ctx); | |
353 | |
354 ctx = next; | |
355 } while (ctx); | |
356 | |
357 if (addrs) { | |
358 ngx_resolver_free(r, addrs); | |
359 } | |
360 | |
361 return NGX_OK; | |
362 } | |
363 | |
364 /* NGX_RESOLVE_CNAME */ | |
365 | |
366 ctx->name.len = rn->cnlen; | |
367 ctx->name.data = rn->u.cname; | |
368 | |
369 return ngx_resolve_name_locked(r, ctx); | |
370 } | |
371 | |
372 if (rn->waiting) { | |
373 | |
374 ctx->next = rn->waiting; | |
375 rn->waiting = ctx; | |
376 | |
377 return NGX_AGAIN; | |
378 } | |
379 | |
380 ngx_queue_remove(&rn->queue); | |
381 | |
382 /* lock alloc mutex */ | |
383 | |
384 ngx_resolver_free_locked(r, rn->query); | |
385 | |
386 if (rn->cnlen) { | |
387 ngx_resolver_free_locked(r, rn->u.cname); | |
388 } | |
389 | |
390 if (rn->naddrs > 1) { | |
391 ngx_resolver_free_locked(r, rn->u.addrs); | |
392 } | |
393 | |
394 /* unlock alloc mutex */ | |
395 | |
396 } else { | |
397 | |
398 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
399 if (rn == NULL) { | |
400 return NGX_ERROR; | |
401 } | |
402 | |
403 rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len); | |
404 if (rn->name == NULL) { | |
405 ngx_resolver_free(r, rn); | |
406 return NGX_ERROR; | |
407 } | |
408 | |
409 rn->node.key = hash; | |
410 rn->nlen = (u_short) ctx->name.len; | |
411 | |
412 ngx_rbtree_insert(&r->name_rbtree, &rn->node); | |
413 } | |
414 | |
415 if (ngx_resolver_create_name_query(rn, ctx) != NGX_OK) { | |
416 goto failed; | |
417 } | |
418 | |
419 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
420 goto failed; | |
421 } | |
422 | |
423 if (ctx->event == NULL) { | |
424 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
425 if (ctx->event == NULL) { | |
426 goto failed; | |
427 } | |
428 | |
429 ctx->event->handler = ngx_resolver_timeout_handler; | |
430 ctx->event->data = ctx; | |
431 ctx->event->log = r->log; | |
432 ctx->ident = -1; | |
433 | |
434 ngx_add_timer(ctx->event, ctx->timeout); | |
435 } | |
436 | |
437 if (ngx_queue_empty(&r->name_resend_queue)) { | |
438 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
439 } | |
440 | |
441 rn->expire = ngx_time() + r->resend_timeout; | |
442 | |
443 ngx_queue_insert_head(&r->name_resend_queue, &rn->queue); | |
444 | |
445 rn->cnlen = 0; | |
446 rn->naddrs = 0; | |
447 rn->valid = 0; | |
448 rn->waiting = ctx; | |
449 | |
450 ctx->state = NGX_AGAIN; | |
451 | |
452 return NGX_AGAIN; | |
453 | |
454 failed: | |
455 | |
456 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
457 | |
458 ngx_resolver_free(r, rn->name); | |
459 | |
460 ngx_resolver_free(r, rn); | |
461 | |
462 return NGX_ERROR; | |
463 } | |
583 | 464 |
465 | |
466 ngx_int_t | |
1649 | 467 ngx_resolve_addr(ngx_resolver_ctx_t *ctx) |
468 { | |
469 ngx_resolver_t *r; | |
470 ngx_resolver_node_t *rn; | |
471 | |
472 r = ctx->resolver; | |
473 | |
474 ctx->addr = ntohl(ctx->addr); | |
475 | |
476 /* lock addr mutex */ | |
477 | |
478 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
479 | |
480 if (rn) { | |
481 | |
482 if (rn->valid >= ngx_time()) { | |
483 | |
484 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
485 | |
486 ngx_queue_remove(&rn->queue); | |
487 | |
488 rn->expire = ngx_time() + r->expire; | |
489 | |
490 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
491 | |
492 ctx->name.len = rn->nlen; | |
493 ctx->name.data = ngx_resolver_dup(r, rn->name, rn->nlen); | |
494 if (ctx->name.data == NULL) { | |
495 goto failed; | |
496 } | |
497 | |
498 /* unlock addr mutex */ | |
499 | |
500 ctx->state = NGX_OK; | |
501 | |
502 ctx->handler(ctx); | |
503 | |
504 ngx_resolver_free(r, ctx->name.data); | |
505 | |
506 return NGX_OK; | |
507 } | |
508 | |
509 if (rn->waiting) { | |
510 | |
511 ctx->next = rn->waiting; | |
512 rn->waiting = ctx; | |
513 | |
514 return NGX_AGAIN; | |
515 } | |
516 | |
517 ngx_queue_remove(&rn->queue); | |
518 | |
519 ngx_resolver_free(r, rn->query); | |
520 | |
521 } else { | |
522 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
523 if (rn == NULL) { | |
524 goto failed; | |
525 } | |
526 | |
527 rn->node.key = ctx->addr; | |
528 | |
529 ngx_rbtree_insert(&r->addr_rbtree, &rn->node); | |
530 } | |
531 | |
532 if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) { | |
533 goto failed; | |
534 } | |
535 | |
536 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
537 goto failed; | |
538 } | |
539 | |
540 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
541 if (ctx->event == NULL) { | |
542 goto failed; | |
543 } | |
544 | |
545 ctx->event->handler = ngx_resolver_timeout_handler; | |
546 ctx->event->data = ctx; | |
547 ctx->event->log = r->log; | |
548 ctx->ident = -1; | |
549 | |
550 ngx_add_timer(ctx->event, ctx->timeout); | |
551 | |
552 if (ngx_queue_empty(&r->addr_resend_queue)) { | |
553 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
554 } | |
555 | |
556 rn->expire = ngx_time() + r->resend_timeout; | |
557 | |
558 ngx_queue_insert_head(&r->addr_resend_queue, &rn->queue); | |
559 | |
560 rn->cnlen = 0; | |
561 rn->naddrs = 0; | |
562 rn->name = NULL; | |
563 rn->nlen = 0; | |
564 rn->valid = 0; | |
565 rn->waiting = ctx; | |
566 | |
567 /* unlock addr mutex */ | |
568 | |
569 ctx->state = NGX_AGAIN; | |
570 | |
571 return NGX_OK; | |
572 | |
573 failed: | |
574 | |
575 if (rn) { | |
576 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
577 | |
578 ngx_resolver_free(r, rn); | |
579 } | |
580 | |
581 /* unlock addr mutex */ | |
582 | |
583 if (ctx->event) { | |
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584 ngx_resolver_free(r, ctx->event); |
1649 | 585 } |
586 | |
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587 ngx_resolver_free(r, ctx); |
1649 | 588 |
589 return NGX_ERROR; | |
590 } | |
591 | |
592 | |
593 void | |
594 ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx) | |
595 { | |
596 in_addr_t addr; | |
597 ngx_resolver_t *r; | |
598 ngx_resolver_ctx_t *w, **p; | |
599 ngx_resolver_node_t *rn; | |
600 | |
601 r = ctx->resolver; | |
602 | |
603 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
604 "resolve addr done: %i", ctx->state); | |
605 | |
606 if (ctx->event && ctx->event->timer_set) { | |
607 ngx_del_timer(ctx->event); | |
608 } | |
609 | |
610 /* lock addr mutex */ | |
611 | |
612 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
613 | |
614 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
615 | |
616 if (rn) { | |
617 p = &rn->waiting; | |
618 w = rn->waiting; | |
619 | |
620 while (w) { | |
621 if (w == ctx) { | |
622 *p = w->next; | |
623 | |
624 goto done; | |
625 } | |
626 | |
627 p = &w->next; | |
628 w = w->next; | |
629 } | |
630 } | |
631 | |
632 addr = ntohl(ctx->addr); | |
633 | |
634 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
635 "could not cancel %ud.%ud.%ud.%ud resolving", | |
636 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
637 (addr >> 8) & 0xff, addr & 0xff); | |
638 } | |
639 | |
640 done: | |
641 | |
642 ngx_resolver_expire(r, &r->addr_rbtree, &r->addr_expire_queue); | |
643 | |
644 /* unlock addr mutex */ | |
645 | |
1904
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646 /* lock alloc mutex */ |
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647 |
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648 if (ctx->event) { |
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649 ngx_resolver_free_locked(r, ctx->event); |
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650 } |
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651 |
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652 ngx_resolver_free_locked(r, ctx); |
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653 |
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654 /* unlock alloc mutex */ |
1649 | 655 } |
656 | |
657 | |
658 static void | |
659 ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
660 { | |
661 time_t now; | |
662 ngx_uint_t i; | |
663 ngx_queue_t *q; | |
664 ngx_resolver_node_t *rn; | |
665 | |
666 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire"); | |
667 | |
668 now = ngx_time(); | |
669 | |
670 for (i = 0; i < 2; i++) { | |
671 if (ngx_queue_empty(queue)) { | |
672 return; | |
673 } | |
674 | |
675 q = ngx_queue_last(queue); | |
676 | |
677 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
678 | |
679 if (now <= rn->expire) { | |
680 return; | |
681 } | |
682 | |
1774 | 683 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, |
684 "resolver expire \"%*s\"", (size_t) rn->nlen, rn->name); | |
1649 | 685 |
686 ngx_queue_remove(q); | |
687 | |
688 ngx_rbtree_delete(tree, &rn->node); | |
689 | |
690 ngx_resolver_free_node(r, rn); | |
691 } | |
692 } | |
693 | |
694 | |
695 static ngx_int_t | |
696 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
697 { | |
698 ssize_t n; | |
699 ngx_udp_connection_t *uc; | |
700 | |
701 uc = r->udp_connection; | |
702 | |
703 if (uc->connection == NULL) { | |
704 if (ngx_udp_connect(uc) != NGX_OK) { | |
705 return NGX_ERROR; | |
706 } | |
707 | |
708 uc->connection->data = r; | |
709 uc->connection->read->handler = ngx_resolver_read_response; | |
710 } | |
711 | |
712 n = ngx_send(uc->connection, rn->query, rn->qlen); | |
713 | |
714 if (n == -1) { | |
715 return NGX_ERROR; | |
716 } | |
717 | |
718 if ((size_t) n != (size_t) rn->qlen) { | |
719 ngx_log_error(NGX_LOG_CRIT, uc->log, 0, "send() incomplete"); | |
720 return NGX_ERROR; | |
721 } | |
722 | |
723 return NGX_OK; | |
724 } | |
725 | |
726 | |
727 static void | |
728 ngx_resolver_resend_handler(ngx_event_t *ev) | |
729 { | |
730 time_t timer, atimer, ntimer; | |
731 ngx_resolver_t *r; | |
732 | |
733 r = ev->data; | |
734 | |
735 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, | |
736 "resolver resend handler"); | |
737 | |
738 /* lock name mutex */ | |
739 | |
740 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue); | |
741 | |
742 /* unlock name mutex */ | |
743 | |
744 /* lock addr mutex */ | |
745 | |
746 atimer = ngx_resolver_resend(r, &r->addr_rbtree, &r->addr_resend_queue); | |
1679
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diff
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|
747 |
1649 | 748 /* unlock addr mutex */ |
749 | |
750 if (ntimer == 0) { | |
751 timer = atimer; | |
752 | |
753 } else if (atimer == 0) { | |
754 timer = ntimer; | |
755 | |
756 } else { | |
757 timer = (atimer < ntimer) ? atimer : ntimer; | |
758 } | |
759 | |
760 if (timer) { | |
761 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000)); | |
762 } | |
763 } | |
764 | |
765 | |
766 static time_t | |
767 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
768 { | |
769 time_t now; | |
770 ngx_queue_t *q; | |
771 ngx_resolver_node_t *rn; | |
772 | |
773 now = ngx_time(); | |
774 | |
775 for ( ;; ) { | |
776 if (ngx_queue_empty(queue)) { | |
777 return 0; | |
778 } | |
779 | |
780 q = ngx_queue_last(queue); | |
781 | |
782 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
783 | |
784 if (now < rn->expire) { | |
785 return rn->expire - now; | |
786 } | |
787 | |
1774 | 788 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, |
789 "resolver resend \"%*s\" %p", | |
790 (size_t) rn->nlen, rn->name, rn->waiting); | |
1649 | 791 |
792 ngx_queue_remove(q); | |
793 | |
794 if (rn->waiting) { | |
795 | |
796 if (ngx_resolver_send_query(r, rn) == NGX_OK) { | |
797 | |
798 rn->expire = now + r->resend_timeout; | |
799 | |
800 ngx_queue_insert_head(queue, &rn->queue); | |
801 } | |
1879
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802 |
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|
803 continue; |
1649 | 804 } |
805 | |
806 ngx_rbtree_delete(tree, &rn->node); | |
807 | |
808 ngx_resolver_free_node(r, rn); | |
809 } | |
810 } | |
811 | |
812 | |
813 static void | |
814 ngx_resolver_read_response(ngx_event_t *rev) | |
815 { | |
816 ssize_t n; | |
817 ngx_connection_t *c; | |
818 u_char buf[NGX_RESOLVER_UDP_SIZE]; | |
819 | |
820 c = rev->data; | |
821 | |
822 do { | |
1689 | 823 n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE); |
824 | |
825 if (n < 0) { | |
1649 | 826 return; |
827 } | |
828 | |
829 ngx_resolver_process_response(c->data, buf, n); | |
830 | |
831 } while (rev->ready); | |
832 } | |
833 | |
834 | |
835 static void | |
836 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n) | |
837 { | |
838 char *err; | |
839 size_t len; | |
840 ngx_uint_t i, ident, flags, code, nqs, nan, qtype, qclass; | |
841 ngx_resolver_qs_t *qs; | |
842 ngx_resolver_query_t *query; | |
843 | |
844 if ((size_t) n < sizeof(ngx_resolver_query_t) + 1) { | |
845 goto short_response; | |
846 } | |
847 | |
848 query = (ngx_resolver_query_t *) buf; | |
849 | |
850 ident = (query->ident_hi << 8) + query->ident_lo; | |
851 flags = (query->flags_hi << 8) + query->flags_lo; | |
852 nqs = (query->nqs_hi << 8) + query->nqs_lo; | |
853 nan = (query->nan_hi << 8) + query->nan_lo; | |
854 | |
855 ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0, | |
856 "resolver DNS response %d fl:%04Xud %d/%d/%d/%d", | |
857 ident, flags, nqs, nan, | |
858 (query->nns_hi << 8) + query->nns_lo, | |
859 (query->nar_hi << 8) + query->nar_lo); | |
860 | |
861 if (!(flags & 0x8000)) { | |
862 ngx_log_error(r->log_level, r->log, 0, | |
863 "invalid DNS response %d fl:%04Xud", ident, flags); | |
864 return; | |
865 } | |
866 | |
867 code = flags & 0x7f; | |
868 | |
869 if (code == NGX_RESOLVE_FORMERR || code > NGX_RESOLVE_REFUSED) { | |
870 ngx_log_error(r->log_level, r->log, 0, | |
871 "DNS error (%d: %s), query id:%d", | |
872 code, ngx_resolver_strerror(code), ident); | |
873 return; | |
874 } | |
875 | |
876 if (nqs != 1) { | |
877 err = "invalid number of questions in DNS response"; | |
878 goto done; | |
879 } | |
880 | |
881 i = sizeof(ngx_resolver_query_t); | |
882 | |
883 while (i < (ngx_uint_t) n) { | |
884 if (buf[i] == '\0') { | |
885 goto found; | |
886 } | |
887 | |
888 len = buf[i]; | |
889 i += 1 + len; | |
890 } | |
891 | |
892 goto short_response; | |
893 | |
894 found: | |
895 | |
896 if (i++ == 0) { | |
897 err = "zero-length domain name in DNS response"; | |
898 goto done; | |
899 } | |
900 | |
901 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t)) | |
902 > (ngx_uint_t) n) | |
903 { | |
904 goto short_response; | |
905 } | |
906 | |
907 qs = (ngx_resolver_qs_t *) &buf[i]; | |
908 | |
909 qtype = (qs->type_hi << 8) + qs->type_lo; | |
910 qclass = (qs->class_hi << 8) + qs->class_lo; | |
911 | |
912 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
913 "resolver DNS response qt:%d cl:%d", qtype, qclass); | |
914 | |
915 if (qclass != 1) { | |
916 ngx_log_error(r->log_level, r->log, 0, | |
917 "unknown query class %d in DNS response", qclass); | |
918 return; | |
919 } | |
920 | |
921 switch (qtype) { | |
922 | |
923 case NGX_RESOLVE_A: | |
924 | |
925 ngx_resolver_process_a(r, buf, n, ident, code, nan, | |
1742
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parents:
1741
diff
changeset
|
926 i + sizeof(ngx_resolver_qs_t)); |
1649 | 927 |
928 break; | |
929 | |
930 case NGX_RESOLVE_PTR: | |
931 | |
1742
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diff
changeset
|
932 ngx_resolver_process_ptr(r, buf, n, ident, code, nan); |
1649 | 933 |
934 break; | |
935 | |
936 default: | |
937 ngx_log_error(r->log_level, r->log, 0, | |
938 "unknown query type %d in DNS response", qtype); | |
939 return; | |
940 } | |
941 | |
942 return; | |
943 | |
944 short_response: | |
945 | |
946 err = "short dns response"; | |
947 | |
948 done: | |
949 | |
950 ngx_log_error(r->log_level, r->log, 0, err); | |
951 | |
952 return; | |
953 } | |
954 | |
955 | |
956 static void | |
957 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last, | |
958 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans) | |
583 | 959 { |
1649 | 960 char *err; |
961 u_char *cname; | |
962 size_t len; | |
963 uint32_t hash; | |
964 in_addr_t addr, *addrs; | |
965 ngx_str_t name; | |
966 ngx_uint_t qtype, qident, naddrs, a, i, n, start; | |
967 ngx_resolver_an_t *an; | |
968 ngx_resolver_ctx_t *ctx, *next; | |
969 ngx_resolver_node_t *rn; | |
970 | |
971 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) { | |
972 return; | |
973 } | |
974 | |
975 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); | |
976 | |
977 hash = ngx_crc32_short(name.data, name.len); | |
978 | |
979 /* lock name mutex */ | |
980 | |
981 rn = ngx_resolver_lookup_name(r, &name, hash); | |
982 | |
983 if (rn == NULL || rn->query == NULL) { | |
984 ngx_log_error(r->log_level, r->log, 0, | |
985 "unexpected response for %V", &name); | |
986 goto failed; | |
987 } | |
988 | |
989 qident = (rn->query[0] << 8) + rn->query[1]; | |
990 | |
991 if (ident != qident) { | |
992 ngx_log_error(r->log_level, r->log, 0, | |
993 "wrong ident %d response for %V, expect %d", | |
994 ident, &name, qident); | |
995 goto failed; | |
996 } | |
997 | |
1742
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diff
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|
998 if (code == 0 && nan == 0) { |
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|
999 code = 3; /* NXDOMAIN */ |
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1000 } |
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1001 |
1649 | 1002 if (code) { |
1003 next = rn->waiting; | |
1004 rn->waiting = NULL; | |
1005 | |
1006 ngx_queue_remove(&rn->queue); | |
1007 | |
1008 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
1009 | |
1010 ngx_resolver_free_node(r, rn); | |
1011 | |
1012 /* unlock name mutex */ | |
1013 | |
1014 while (next) { | |
1015 ctx = next; | |
1016 ctx->state = code; | |
1017 next = ctx->next; | |
1018 | |
1019 ctx->handler(ctx); | |
1020 } | |
1021 | |
1022 return; | |
1023 } | |
1024 | |
1025 i = ans; | |
1026 naddrs = 0; | |
1027 addr = 0; | |
1028 addrs = NULL; | |
1029 cname = NULL; | |
1030 qtype = 0; | |
1031 | |
1032 for (a = 0; a < nan; a++) { | |
1033 | |
1034 start = i; | |
1035 | |
1036 while (i < last) { | |
1037 | |
1038 if (buf[i] & 0xc0) { | |
1039 i += 2; | |
1040 goto found; | |
1041 } | |
1042 | |
1043 if (buf[i] == 0) { | |
1044 i++; | |
1045 goto test_length; | |
1046 } | |
1047 | |
1048 i += 1 + buf[i]; | |
1049 } | |
1050 | |
1051 goto short_response; | |
1052 | |
1053 test_length: | |
1054 | |
1055 if (i - start < 2) { | |
1056 err = "invalid name in dns response"; | |
1057 goto invalid; | |
1058 } | |
1059 | |
1060 found: | |
1061 | |
1062 if (i + sizeof(ngx_resolver_an_t) >= last) { | |
1063 goto short_response; | |
1064 } | |
1065 | |
1066 an = (ngx_resolver_an_t *) &buf[i]; | |
1067 | |
1068 qtype = (an->type_hi << 8) + an->type_lo; | |
1069 len = (an->len_hi << 8) + an->len_lo; | |
1070 | |
1071 if (qtype == NGX_RESOLVE_A) { | |
1072 | |
1073 i += sizeof(ngx_resolver_an_t); | |
1074 | |
1075 if (i + len > last) { | |
1076 goto short_response; | |
1077 } | |
1078 | |
1079 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
1080 + (buf[i + 2] << 8) + (buf[i + 3])); | |
1081 | |
1082 naddrs++; | |
1083 | |
1084 i += len; | |
1085 | |
1086 } else if (qtype == NGX_RESOLVE_CNAME) { | |
1087 cname = &buf[i] + sizeof(ngx_resolver_an_t); | |
1088 i += sizeof(ngx_resolver_an_t) + len; | |
1089 } | |
1090 } | |
1091 | |
1092 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1093 "resolver naddrs:%ui cname:%p", naddrs, cname); | |
1094 | |
1095 if (naddrs) { | |
1096 | |
1097 if (naddrs == 1) { | |
1098 rn->u.addr = addr; | |
1099 | |
1100 } else { | |
1101 | |
1102 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t)); | |
1103 if (addrs == NULL) { | |
1104 return; | |
1105 } | |
1106 | |
1107 n = 0; | |
1108 i = ans; | |
1109 | |
1110 for (a = 0; a < nan; a++) { | |
1111 | |
1112 for ( ;; ) { | |
1113 | |
1114 if (buf[i] & 0xc0) { | |
1115 i += 2; | |
1116 goto ok; | |
1117 } | |
1118 | |
1119 if (buf[i] == 0) { | |
1120 i++; | |
1121 goto ok; | |
1122 } | |
1123 | |
1124 i += 1 + buf[i]; | |
1125 } | |
1126 | |
1127 ok: | |
1128 | |
1129 an = (ngx_resolver_an_t *) &buf[i]; | |
1130 | |
1131 qtype = (an->type_hi << 8) + an->type_lo; | |
1132 len = (an->len_hi << 8) + an->len_lo; | |
1133 | |
1134 i += sizeof(ngx_resolver_an_t); | |
1135 | |
1136 if (qtype == NGX_RESOLVE_A) { | |
1137 | |
1138 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
1139 + (buf[i + 2] << 8) + (buf[i + 3])); | |
1140 | |
1141 if (n == naddrs) { | |
1142 break; | |
1143 } | |
1144 } | |
1145 | |
1146 i += len; | |
1147 } | |
1148 | |
1149 rn->u.addrs = addrs; | |
1150 | |
1151 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
1152 naddrs * sizeof(in_addr_t)); | |
1153 if (addrs == NULL) { | |
1154 return; | |
1155 } | |
1156 } | |
1157 | |
1158 rn->naddrs = (u_short) naddrs; | |
1159 | |
1160 ngx_queue_remove(&rn->queue); | |
1161 | |
1162 rn->valid = ngx_time() + r->valid; | |
1163 rn->expire = ngx_time() + r->expire; | |
1164 | |
1165 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
1166 | |
1167 next = rn->waiting; | |
1168 rn->waiting = NULL; | |
1169 | |
1170 /* unlock name mutex */ | |
1171 | |
1172 while (next) { | |
1173 ctx = next; | |
1174 ctx->state = NGX_OK; | |
1175 ctx->naddrs = naddrs; | |
1176 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
1177 ctx->addr = addr; | |
1178 next = ctx->next; | |
1179 | |
1180 ctx->handler(ctx); | |
1181 } | |
1182 | |
1183 if (naddrs) { | |
1184 ngx_resolver_free(r, addrs); | |
1185 } | |
1186 | |
1187 return; | |
1188 | |
1189 } else if (cname) { | |
1190 | |
1191 /* CNAME only */ | |
1192 | |
1193 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) { | |
1194 return; | |
1195 } | |
1196 | |
1197 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1198 "resolver cname:\"%V\"", &name); | |
1199 | |
1741
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1200 ngx_queue_remove(&rn->queue); |
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1201 |
1649 | 1202 rn->cnlen = (u_short) name.len; |
1203 rn->u.cname = name.data; | |
1204 rn->valid = ngx_time() + r->valid; | |
1205 rn->expire = ngx_time() + r->expire; | |
1206 | |
1207 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
1208 | |
1209 ctx = rn->waiting; | |
1210 rn->waiting = NULL; | |
1211 | |
1212 if (ctx) { | |
1213 ctx->name = name; | |
1214 | |
1215 (void) ngx_resolve_name_locked(r, ctx); | |
1216 } | |
1217 | |
1218 return; | |
1219 } | |
1220 | |
1221 ngx_log_error(r->log_level, r->log, 0, | |
1222 "no A or CNAME types in DNS responses, unknown query type: %d", | |
1223 qtype); | |
1224 return; | |
1225 | |
1226 short_response: | |
1227 | |
1228 err = "short dns response"; | |
1229 | |
1230 invalid: | |
1231 | |
1232 /* unlock name mutex */ | |
1233 | |
1234 ngx_log_error(r->log_level, r->log, 0, err); | |
1235 | |
1236 return; | |
1237 | |
1238 failed: | |
1239 | |
1240 /* unlock name mutex */ | |
1241 | |
1242 return; | |
1243 } | |
1244 | |
1245 | |
1246 static void | |
1247 ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, | |
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1248 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan) |
1649 | 1249 { |
1250 char *err; | |
1251 size_t len; | |
1252 in_addr_t addr; | |
1253 ngx_int_t digit; | |
1254 ngx_str_t name; | |
1255 ngx_uint_t i, mask, qtype, qclass, qident; | |
1256 ngx_resolver_an_t *an; | |
1257 ngx_resolver_ctx_t *ctx, *next; | |
1258 ngx_resolver_node_t *rn; | |
1259 | |
1260 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) { | |
1261 goto invalid_in_addr_arpa; | |
1262 } | |
1263 | |
1264 addr = 0; | |
1265 i = 12; | |
1266 | |
1267 for (mask = 0; mask < 32; mask += 8) { | |
1268 len = buf[i++]; | |
1269 | |
1270 digit = ngx_atoi(&buf[i], len); | |
1271 if (digit == NGX_ERROR || digit > 255) { | |
1272 goto invalid_in_addr_arpa; | |
1273 } | |
1274 | |
1275 addr += digit << mask; | |
1276 i += len; | |
1277 } | |
1278 | |
1279 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) { | |
1280 goto invalid_in_addr_arpa; | |
1281 } | |
1282 | |
1283 /* lock addr mutex */ | |
1284 | |
1285 rn = ngx_resolver_lookup_addr(r, addr); | |
1286 | |
1287 if (rn == NULL || rn->query == NULL) { | |
1288 ngx_log_error(r->log_level, r->log, 0, | |
1289 "unexpected response for %ud.%ud.%ud.%ud", | |
1290 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
1291 (addr >> 8) & 0xff, addr & 0xff); | |
1292 goto failed; | |
1293 } | |
1294 | |
1295 qident = (rn->query[0] << 8) + rn->query[1]; | |
1296 | |
1297 if (ident != qident) { | |
1298 ngx_log_error(r->log_level, r->log, 0, | |
1299 "wrong ident %d response for %ud.%ud.%ud.%ud, expect %d", | |
1300 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
1301 (addr >> 8) & 0xff, addr & 0xff, qident); | |
1302 goto failed; | |
1303 } | |
1304 | |
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1305 if (code == 0 && nan == 0) { |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1306 code = 3; /* NXDOMAIN */ |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1307 } |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1308 |
1649 | 1309 if (code) { |
1310 next = rn->waiting; | |
1311 rn->waiting = NULL; | |
1312 | |
1313 ngx_queue_remove(&rn->queue); | |
1314 | |
1315 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
1316 | |
1317 ngx_resolver_free_node(r, rn); | |
1318 | |
1319 /* unlock addr mutex */ | |
1320 | |
1321 while (next) { | |
1322 ctx = next; | |
1323 ctx->state = code; | |
1324 next = ctx->next; | |
1325 | |
1326 ctx->handler(ctx); | |
1327 } | |
1328 | |
1329 return; | |
1330 } | |
1331 | |
1332 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t); | |
1333 | |
1334 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) { | |
1335 goto short_response; | |
1336 } | |
1337 | |
1338 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */ | |
1339 | |
1340 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) { | |
1341 err = "invalid in-addr.arpa name in DNS response"; | |
1342 goto invalid; | |
1343 } | |
1344 | |
1345 an = (ngx_resolver_an_t *) &buf[i + 2]; | |
1346 | |
1347 qtype = (an->type_hi << 8) + an->type_lo; | |
1348 qclass = (an->class_hi << 8) + an->class_lo; | |
1349 len = (an->len_hi << 8) + an->len_lo; | |
1350 | |
1351 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1352 "resolver qt:%d cl:%d len:%uz", qtype, qclass, len); | |
1353 | |
1354 i += 2 + sizeof(ngx_resolver_an_t); | |
1355 | |
1356 if (i + len > (ngx_uint_t) n) { | |
1357 goto short_response; | |
1358 } | |
1359 | |
1360 len -= 2; | |
1361 | |
1362 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) { | |
1363 return; | |
1364 } | |
1365 | |
1366 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name); | |
1367 | |
1368 if (len != (size_t) rn->nlen || ngx_strncmp(name.data, rn->name, len) != 0) | |
1369 { | |
1370 ngx_resolver_free(r, rn->name); | |
1371 rn->name = name.data; | |
1372 | |
1373 name.data = ngx_resolver_dup(r, rn->name, len); | |
1374 if (name.data == NULL) { | |
1375 goto failed; | |
1376 } | |
1377 } | |
1378 | |
1379 ngx_queue_remove(&rn->queue); | |
1380 | |
1381 rn->valid = ngx_time() + r->valid; | |
1382 rn->expire = ngx_time() + r->expire; | |
1383 | |
1384 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
1385 | |
1386 next = rn->waiting; | |
1387 rn->waiting = NULL; | |
1388 | |
1389 /* unlock addr mutex */ | |
1390 | |
1391 while (next) { | |
1392 ctx = next; | |
1393 ctx->state = NGX_OK; | |
1394 ctx->name = name; | |
1395 next = ctx->next; | |
1396 | |
1397 ctx->handler(ctx); | |
1398 } | |
1399 | |
1400 ngx_resolver_free(r, name.data); | |
1401 | |
1402 return; | |
1403 | |
1404 invalid_in_addr_arpa: | |
1405 | |
1406 ngx_log_error(r->log_level, r->log, 0, | |
1407 "invalid in-addr.arpa name in DNS response"); | |
1408 return; | |
1409 | |
1410 short_response: | |
1411 | |
1412 err = "short DNS response"; | |
1413 | |
1414 invalid: | |
1415 | |
1416 /* unlock addr mutex */ | |
1417 | |
1418 ngx_log_error(r->log_level, r->log, 0, err); | |
1419 | |
1420 return; | |
1421 | |
1422 failed: | |
1423 | |
1424 /* unlock addr mutex */ | |
1425 | |
1426 return; | |
1427 } | |
1428 | |
1429 | |
1430 static ngx_resolver_node_t * | |
1431 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) | |
1432 { | |
1433 ngx_int_t rc; | |
1434 size_t len; | |
1435 ngx_rbtree_node_t *node, *sentinel; | |
1436 ngx_resolver_node_t *rn; | |
1437 | |
1438 node = r->name_rbtree.root; | |
1439 sentinel = r->name_rbtree.sentinel; | |
1440 | |
1441 while (node != sentinel) { | |
1442 | |
1443 if (hash < node->key) { | |
1444 node = node->left; | |
1445 continue; | |
1446 } | |
1447 | |
1448 if (hash > node->key) { | |
1449 node = node->right; | |
1450 continue; | |
1451 } | |
1452 | |
1453 /* hash == node->key */ | |
1454 | |
1455 do { | |
1456 rn = (ngx_resolver_node_t *) node; | |
1457 | |
1458 len = (name->len > (size_t) rn->nlen) ? rn->nlen : name->len; | |
1459 | |
1460 rc = ngx_strncmp(name->data, rn->name, len); | |
1461 | |
1462 if (rc == 0) { | |
1463 return rn; | |
1464 } | |
1465 | |
1466 node = (rc < 0) ? node->left : node->right; | |
1467 | |
1468 } while (node != sentinel && hash == node->key); | |
1469 | |
1470 break; | |
1471 } | |
1472 | |
1473 /* not found */ | |
1474 | |
1475 return NULL; | |
1476 } | |
1477 | |
1478 | |
1479 static ngx_resolver_node_t * | |
1480 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr) | |
1481 { | |
1482 ngx_rbtree_node_t *node, *sentinel; | |
1483 | |
1484 node = r->addr_rbtree.root; | |
1485 sentinel = r->addr_rbtree.sentinel; | |
1486 | |
1487 while (node != sentinel) { | |
1488 | |
1489 if (addr < node->key) { | |
1490 node = node->left; | |
1491 continue; | |
1492 } | |
1493 | |
1494 if (addr > node->key) { | |
1495 node = node->right; | |
1496 continue; | |
1497 } | |
1498 | |
1499 /* addr == node->key */ | |
1500 | |
1501 return (ngx_resolver_node_t *) node; | |
1502 } | |
1503 | |
1504 /* not found */ | |
1505 | |
1506 return NULL; | |
1507 } | |
1508 | |
1509 | |
1510 static void | |
1511 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
1512 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
1513 { | |
1514 size_t len; | |
1515 ngx_rbtree_node_t **p; | |
1516 ngx_resolver_node_t *rn, *rn_temp; | |
1517 | |
1518 for ( ;; ) { | |
1519 | |
1520 if (node->key < temp->key) { | |
1521 | |
1522 p = &temp->left; | |
1523 | |
1524 } else if (node->key > temp->key) { | |
1525 | |
1526 p = &temp->right; | |
1527 | |
1528 } else { /* node->key == temp->key */ | |
1529 | |
1530 rn = (ngx_resolver_node_t *) node; | |
1531 rn_temp = (ngx_resolver_node_t *) temp; | |
1532 | |
1533 len = (rn->nlen > rn_temp->nlen) ? rn_temp->nlen : rn->nlen; | |
1534 | |
1535 p = (ngx_strncmp(rn->name, rn_temp->name, len) < 0) | |
1536 ? &temp->left : &temp->right; | |
1537 } | |
1538 | |
1539 if (*p == sentinel) { | |
1540 break; | |
1541 } | |
1542 | |
1543 temp = *p; | |
1544 } | |
1545 | |
1546 *p = node; | |
1547 node->parent = temp; | |
1548 node->left = sentinel; | |
1549 node->right = sentinel; | |
1550 ngx_rbt_red(node); | |
1551 } | |
1552 | |
1553 | |
1554 static ngx_int_t | |
1555 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
1556 { | |
1557 u_char *p, *s; | |
1558 size_t len; | |
1559 ngx_uint_t ident; | |
1560 ngx_resolver_qs_t *qs; | |
1561 ngx_resolver_query_t *query; | |
1562 | |
1563 len = sizeof(ngx_resolver_query_t) | |
1564 + 1 + ctx->name.len + 1 + sizeof(ngx_resolver_qs_t); | |
1565 | |
1566 p = ngx_resolver_calloc(ctx->resolver, len); | |
1567 if (p == NULL) { | |
1568 return NGX_ERROR; | |
1569 } | |
1570 | |
1571 rn->qlen = (u_short) len; | |
1572 rn->query = p; | |
1573 | |
1574 query = (ngx_resolver_query_t *) p; | |
1575 | |
1576 ident = ngx_random(); | |
1577 | |
1578 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0, | |
1579 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff); | |
1580 | |
1581 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
1582 query->ident_lo = (u_char) (ident & 0xff); | |
1583 | |
1584 /* recursion query */ | |
1585 query->flags_hi = 1; query->flags_lo = 0; | |
1586 | |
1587 /* one question */ | |
1588 query->nqs_hi = 0; query->nqs_lo = 1; | |
1589 query->nan_hi = 0; query->nan_lo = 0; | |
1590 query->nns_hi = 0; query->nns_lo = 0; | |
1591 query->nar_hi = 0; query->nar_lo = 0; | |
1592 | |
1593 p += sizeof(ngx_resolver_query_t) + 1 + ctx->name.len + 1; | |
1594 | |
1595 qs = (ngx_resolver_qs_t *) p; | |
1596 | |
1597 /* query type */ | |
1598 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type; | |
1599 | |
1600 /* IP query class */ | |
1601 qs->class_hi = 0; qs->class_lo = 1; | |
1602 | |
1603 /* convert "www.example.com" to "\3www\7example\3com\0" */ | |
1604 | |
1605 len = 0; | |
1606 p--; | |
1607 *p-- = '\0'; | |
1608 | |
1609 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) { | |
1610 if (*s != '.') { | |
1611 *p = *s; | |
1612 len++; | |
1613 | |
1614 } else { | |
1615 *p = (u_char) len; | |
1616 len = 0; | |
1617 } | |
1618 | |
1619 p--; | |
1620 } | |
1621 | |
1622 *p = (u_char) len; | |
1623 | |
1624 return NGX_OK; | |
1625 } | |
1626 | |
1627 | |
1628 /* AF_INET only */ | |
1629 | |
1630 static ngx_int_t | |
1631 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
1632 { | |
1633 u_char *p, *d; | |
1634 size_t len; | |
1635 ngx_int_t n; | |
1636 ngx_uint_t ident; | |
1637 ngx_resolver_query_t *query; | |
1638 | |
1639 len = sizeof(ngx_resolver_query_t) | |
1640 + sizeof(".255.255.255.255.in-addr.arpa.") - 1 | |
1641 + sizeof(ngx_resolver_qs_t); | |
1642 | |
1643 p = ngx_resolver_calloc(ctx->resolver, len); | |
1644 if (p == NULL) { | |
1645 return NGX_ERROR; | |
1646 } | |
1647 | |
1648 rn->query = p; | |
1649 query = (ngx_resolver_query_t *) p; | |
1650 | |
1651 ident = ngx_random(); | |
1652 | |
1653 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
1654 query->ident_lo = (u_char) (ident & 0xff); | |
1655 | |
1656 /* recursion query */ | |
1657 query->flags_hi = 1; query->flags_lo = 0; | |
1658 | |
1659 /* one question */ | |
1660 query->nqs_hi = 0; query->nqs_lo = 1; | |
1661 query->nan_hi = 0; query->nan_lo = 0; | |
1662 query->nns_hi = 0; query->nns_lo = 0; | |
1663 query->nar_hi = 0; query->nar_lo = 0; | |
1664 | |
1665 p += sizeof(ngx_resolver_query_t); | |
1666 | |
1667 for (n = 0; n < 32; n += 8){ | |
1668 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff); | |
1669 *p = (u_char) (d - &p[1]); | |
1670 p = d; | |
1671 } | |
1672 | |
1673 /* query type "PTR", IP query class */ | |
1674 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18); | |
1675 | |
1676 rn->qlen = (u_short) | |
1677 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t) | |
1678 - rn->query); | |
1679 | |
1680 return NGX_OK; | |
1681 } | |
1682 | |
1683 | |
1684 static ngx_int_t | |
1685 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src, | |
1686 u_char *last) | |
1687 { | |
1688 char *err; | |
1689 u_char *p, *dst; | |
1690 ssize_t len; | |
1691 ngx_uint_t i, n; | |
1692 | |
1693 p = src; | |
1694 len = -1; | |
1695 | |
1696 /* | |
1697 * compression pointers allow to create endless loop, so we set limit; | |
1698 * 128 pointers should be enough to store 255-byte name | |
1699 */ | |
1700 | |
1701 for (i = 0; i < 128; i++) { | |
1702 n = *p++; | |
1703 | |
1704 if (n == 0) { | |
1705 goto done; | |
1706 } | |
1707 | |
1708 if (n & 0xc0) { | |
1709 n = (n & 0x3f << 8) + *p; | |
1710 p = &buf[n]; | |
1711 | |
1712 } else { | |
1713 len += 1 + n; | |
1714 p = &p[n]; | |
1715 } | |
1716 | |
1717 if (p >= last) { | |
1718 err = "name is out of response"; | |
1719 goto invalid; | |
1720 } | |
1721 } | |
1722 | |
1723 err = "compression pointers loop"; | |
1724 | |
1725 invalid: | |
1726 | |
1727 ngx_log_error(r->log_level, r->log, 0, err); | |
1728 | |
1729 return NGX_ERROR; | |
1730 | |
1731 done: | |
1732 | |
1733 if (name == NULL) { | |
583 | 1734 return NGX_OK; |
1735 } | |
1736 | |
1649 | 1737 dst = ngx_resolver_alloc(r, len); |
1738 if (dst == NULL) { | |
1739 return NGX_ERROR; | |
1740 } | |
1741 | |
1742 name->data = dst; | |
1743 | |
1744 n = *src++; | |
1745 | |
1746 for ( ;; ) { | |
1747 if (n != 0xc0) { | |
1748 ngx_memcpy(dst, src, n); | |
1749 dst += n; | |
1750 src += n; | |
1751 | |
1752 n = *src++; | |
1753 | |
1754 if (n != 0) { | |
1755 *dst++ = '.'; | |
1756 } | |
1757 | |
1758 } else { | |
1759 n = (n & 0x3f << 8) + *src; | |
1760 src = &buf[n]; | |
1761 | |
1762 n = *src++; | |
1763 } | |
1764 | |
1765 if (n == 0) { | |
1766 name->len = dst - name->data; | |
1767 return NGX_OK; | |
1768 } | |
1769 } | |
1770 } | |
1771 | |
1772 | |
1773 static void | |
1774 ngx_resolver_timeout_handler(ngx_event_t *ev) | |
1775 { | |
1776 ngx_resolver_ctx_t *ctx; | |
1777 | |
1778 ctx = ev->data; | |
1779 | |
1780 ctx->state = NGX_RESOLVE_TIMEDOUT; | |
1781 | |
1782 ctx->handler(ctx); | |
1783 } | |
1784 | |
1785 | |
1786 static void | |
1787 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
1788 { | |
1789 /* lock alloc mutex */ | |
1790 | |
1791 if (rn->query) { | |
1792 ngx_resolver_free_locked(r, rn->query); | |
1793 } | |
1794 | |
1795 if (rn->name) { | |
1796 ngx_resolver_free_locked(r, rn->name); | |
1797 } | |
1798 | |
1799 if (rn->cnlen) { | |
1800 ngx_resolver_free_locked(r, rn->u.cname); | |
1801 } | |
1802 | |
1803 if (rn->naddrs > 1) { | |
1804 ngx_resolver_free_locked(r, rn->u.addrs); | |
1805 } | |
1806 | |
1807 ngx_resolver_free_locked(r, rn); | |
1808 | |
1809 /* unlock alloc mutex */ | |
1810 } | |
1811 | |
1812 | |
1813 static void * | |
1814 ngx_resolver_alloc(ngx_resolver_t *r, size_t size) | |
1815 { | |
1816 u_char *p; | |
1817 | |
1818 /* lock alloc mutex */ | |
1819 | |
1820 p = ngx_alloc(size, r->log); | |
1821 | |
1822 /* unlock alloc mutex */ | |
1823 | |
1824 return p; | |
1825 } | |
1826 | |
1827 | |
1903 | 1828 static void * |
1649 | 1829 ngx_resolver_calloc(ngx_resolver_t *r, size_t size) |
1830 { | |
1831 u_char *p; | |
1832 | |
1833 p = ngx_resolver_alloc(r, size); | |
1834 | |
1835 if (p) { | |
1836 ngx_memzero(p, size); | |
1837 } | |
1838 | |
1839 return p; | |
1840 } | |
1841 | |
1842 | |
1843 static void | |
1844 ngx_resolver_free(ngx_resolver_t *r, void *p) | |
1845 { | |
1846 /* lock alloc mutex */ | |
1847 | |
1848 ngx_free(p); | |
1849 | |
1850 /* unlock alloc mutex */ | |
1851 } | |
1852 | |
1853 | |
1854 static void | |
1855 ngx_resolver_free_locked(ngx_resolver_t *r, void *p) | |
1856 { | |
1857 ngx_free(p); | |
1858 } | |
1859 | |
1860 | |
1861 static void * | |
1862 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size) | |
1863 { | |
1864 void *dst; | |
1865 | |
1866 dst = ngx_resolver_alloc(r, size); | |
1867 | |
1868 if (dst == NULL) { | |
1869 return dst; | |
1870 } | |
1871 | |
1872 ngx_memcpy(dst, src, size); | |
1873 | |
1874 return dst; | |
1875 } | |
1876 | |
1877 | |
1878 char * | |
1879 ngx_resolver_strerror(ngx_int_t err) | |
1880 { | |
1881 static char *errors[] = { | |
1882 "Format error", /* FORMERR */ | |
1883 "Server failure", /* SERVFAIL */ | |
1884 "Host not found", /* NXDOMAIN */ | |
1885 "Unimplemented", /* NOTIMP */ | |
1886 "Operation refused" /* REFUSED */ | |
1887 }; | |
1888 | |
1889 if (err > 0 && err < 6) { | |
1890 return errors[err - 1]; | |
1891 } | |
1892 | |
1893 if (err == NGX_RESOLVE_TIMEDOUT) { | |
1894 return "Operation timed out"; | |
1895 } | |
1896 | |
1897 return "Unknown error"; | |
1898 } | |
1899 | |
1900 | |
1901 ngx_int_t | |
1902 ngx_udp_connect(ngx_udp_connection_t *uc) | |
1903 { | |
1904 int rc; | |
1905 ngx_int_t event; | |
1906 ngx_event_t *rev, *wev; | |
1907 ngx_socket_t s; | |
1908 ngx_connection_t *c; | |
1909 | |
583 | 1910 s = ngx_socket(AF_INET, SOCK_DGRAM, 0); |
1911 | |
1649 | 1912 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, uc->log, 0, "UDP socket %d", s); |
583 | 1913 |
1914 if (s == -1) { | |
1649 | 1915 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
583 | 1916 ngx_socket_n " failed"); |
1917 return NGX_ERROR; | |
1918 } | |
1919 | |
1649 | 1920 c = ngx_get_connection(s, uc->log); |
583 | 1921 |
1922 if (c == NULL) { | |
1923 if (ngx_close_socket(s) == -1) { | |
1649 | 1924 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
583 | 1925 ngx_close_socket_n "failed"); |
1926 } | |
1927 | |
1928 return NGX_ERROR; | |
1929 } | |
1930 | |
1649 | 1931 if (ngx_nonblocking(s) == -1) { |
1932 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
1933 ngx_nonblocking_n " failed"); | |
1934 | |
1935 ngx_free_connection(c); | |
1936 | |
1937 if (ngx_close_socket(s) == -1) { | |
1938 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
1939 ngx_close_socket_n " failed"); | |
1940 } | |
1941 | |
1942 return NGX_ERROR; | |
1943 } | |
1944 | |
583 | 1945 rev = c->read; |
1946 wev = c->write; | |
1947 | |
1649 | 1948 rev->log = uc->log; |
1949 wev->log = uc->log; | |
1950 | |
1951 uc->connection = c; | |
583 | 1952 |
1953 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); | |
1954 | |
1955 #if (NGX_THREADS) | |
1649 | 1956 |
1957 /* TODO: lock event when call completion handler */ | |
1958 | |
1959 rev->lock = &c->lock; | |
1960 wev->lock = &c->lock; | |
583 | 1961 rev->own_lock = &c->lock; |
1962 wev->own_lock = &c->lock; | |
1649 | 1963 |
583 | 1964 #endif |
1965 | |
1649 | 1966 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, uc->log, 0, |
1967 "connect to %V, fd:%d #%d", &uc->server, s, c->number); | |
1968 | |
1969 rc = connect(s, uc->sockaddr, uc->socklen); | |
1970 | |
1971 /* TODO: aio, iocp */ | |
583 | 1972 |
1973 if (rc == -1) { | |
1649 | 1974 ngx_log_error(NGX_LOG_CRIT, uc->log, ngx_socket_errno, |
1975 "connect() to %V failed", &uc->server); | |
583 | 1976 |
1977 return NGX_ERROR; | |
1978 } | |
1979 | |
1649 | 1980 /* UDP sockets are always ready to write */ |
1981 wev->ready = 1; | |
1982 | |
1983 if (ngx_add_event) { | |
1984 | |
1985 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ? | |
1986 /* kqueue, epoll */ NGX_CLEAR_EVENT: | |
1987 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT; | |
1988 /* eventport event type has no meaning: oneshot only */ | |
1989 | |
1990 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { | |
1991 return NGX_ERROR; | |
1992 } | |
1993 | |
1994 } else { | |
1995 /* rtsig */ | |
1996 | |
583 | 1997 if (ngx_add_conn(c) == NGX_ERROR) { |
1998 return NGX_ERROR; | |
1999 } | |
2000 } | |
2001 | |
2002 return NGX_OK; | |
2003 } |