Mercurial > hg > nginx
annotate src/core/ngx_resolver.c @ 1878:24f9901157ab
fix segfault if UDP connect() has failed
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Wed, 06 Feb 2008 16:01:35 +0000 |
parents | 68d21fd1dc64 |
children | cf4ee321d195 |
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
268b81386fe4
no answers in DNS response should be NXDOMAIN
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changeset
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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, |
1742
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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); | |
84 static void ngx_resolver_free(ngx_resolver_t *r, void *p); | |
85 static void ngx_resolver_free_locked(ngx_resolver_t *r, void *p); | |
86 static void *ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size); | |
87 | |
88 | |
89 /* STUB: ngx_peer_addr_t * */ | |
90 | |
91 ngx_resolver_t * | |
92 ngx_resolver_create(ngx_peer_addr_t *addr, ngx_log_t *log) | |
93 { | |
94 ngx_resolver_t *r; | |
95 ngx_udp_connection_t *uc; | |
96 | |
97 r = ngx_calloc(sizeof(ngx_resolver_t), log); | |
98 if (r == NULL) { | |
99 return NULL; | |
100 } | |
101 | |
102 r->event = ngx_calloc(sizeof(ngx_event_t), log); | |
103 if (r->event == NULL) { | |
104 return NULL; | |
105 } | |
106 | |
1687 | 107 ngx_rbtree_init(&r->name_rbtree, &r->name_sentinel, |
108 ngx_resolver_rbtree_insert_value); | |
109 | |
110 ngx_rbtree_init(&r->addr_rbtree, &r->addr_sentinel, | |
111 ngx_rbtree_insert_value); | |
1649 | 112 |
1685 | 113 ngx_queue_init(&r->name_resend_queue); |
114 ngx_queue_init(&r->addr_resend_queue); | |
115 | |
116 ngx_queue_init(&r->name_expire_queue); | |
117 ngx_queue_init(&r->addr_expire_queue); | |
1649 | 118 |
119 r->event->handler = ngx_resolver_resend_handler; | |
120 r->event->data = r; | |
121 r->event->log = log; | |
122 r->ident = -1; | |
123 | |
124 r->resend_timeout = 5; | |
125 r->expire = 30; | |
126 r->valid = 300; | |
127 | |
128 r->log = log; | |
129 r->log_level = NGX_LOG_ALERT; | |
130 | |
1683
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allow to use IP addresses without defined resolver
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parents:
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131 if (addr) { |
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parents:
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132 uc = ngx_calloc(sizeof(ngx_udp_connection_t), log); |
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parents:
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133 if (uc == NULL) { |
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parents:
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134 return NULL; |
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parents:
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135 } |
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parents:
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136 |
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parents:
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137 r->udp_connection = uc; |
1e0b028055ec
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Igor Sysoev <igor@sysoev.ru>
parents:
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138 |
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parents:
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139 uc->sockaddr = addr->sockaddr; |
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parents:
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140 uc->socklen = addr->socklen; |
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parents:
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141 uc->server = addr->name; |
1e0b028055ec
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parents:
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142 uc->log = log; |
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allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
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143 } |
1649 | 144 |
145 return r; | |
146 } | |
147 | |
148 | |
149 ngx_resolver_ctx_t * | |
150 ngx_resolve_start(ngx_resolver_t *r, ngx_resolver_ctx_t *temp) | |
151 { | |
152 in_addr_t addr; | |
153 ngx_resolver_ctx_t *ctx; | |
154 | |
155 if (temp) { | |
156 addr = ngx_inet_addr(temp->name.data, temp->name.len); | |
157 | |
158 if (addr != INADDR_NONE) { | |
159 temp->resolver = r; | |
160 temp->state = NGX_OK; | |
161 temp->naddrs = 1; | |
162 temp->addrs = &temp->addr; | |
163 temp->addr = addr; | |
164 temp->quick = 1; | |
165 | |
166 return temp; | |
167 } | |
168 } | |
169 | |
1683
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parents:
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170 if (r->udp_connection == NULL) { |
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parents:
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171 return NGX_NO_RESOLVER; |
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parents:
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changeset
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172 } |
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parents:
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173 |
1649 | 174 ctx = ngx_resolver_calloc(r, sizeof(ngx_resolver_ctx_t)); |
175 | |
176 if (ctx) { | |
177 ctx->resolver = r; | |
178 } | |
179 | |
180 return ctx; | |
181 } | |
182 | |
183 | |
184 ngx_int_t | |
185 ngx_resolve_name(ngx_resolver_ctx_t *ctx) | |
186 { | |
187 ngx_int_t rc; | |
188 ngx_resolver_t *r; | |
189 | |
190 r = ctx->resolver; | |
191 | |
192 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
193 "resolve: \"%V\"", &ctx->name); | |
194 | |
195 if (ctx->quick) { | |
196 ctx->handler(ctx); | |
197 return NGX_OK; | |
198 } | |
199 | |
200 /* lock name mutex */ | |
201 | |
202 rc = ngx_resolve_name_locked(r, ctx); | |
203 | |
204 if (rc == NGX_OK) { | |
205 return NGX_OK; | |
206 } | |
207 | |
208 /* unlock name mutex */ | |
209 | |
210 if (rc == NGX_AGAIN) { | |
211 return NGX_OK; | |
212 } | |
213 | |
214 /* lock alloc mutex */ | |
215 | |
216 if (ctx->event) { | |
217 ngx_resolver_free_locked(r, ctx->event); | |
218 } | |
219 | |
220 /* unlock alloc mutex */ | |
221 | |
222 return NGX_ERROR; | |
223 } | |
224 | |
225 | |
226 void | |
227 ngx_resolve_name_done(ngx_resolver_ctx_t *ctx) | |
228 { | |
229 uint32_t hash; | |
230 ngx_resolver_t *r; | |
231 ngx_resolver_ctx_t *w, **p; | |
232 ngx_resolver_node_t *rn; | |
233 | |
234 r = ctx->resolver; | |
235 | |
236 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
237 "resolve name done: %i", ctx->state); | |
238 | |
239 if (ctx->quick) { | |
240 return; | |
241 } | |
242 | |
243 if (ctx->event && ctx->event->timer_set) { | |
244 ngx_del_timer(ctx->event); | |
245 } | |
246 | |
247 /* lock name mutex */ | |
248 | |
249 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
250 | |
251 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
252 | |
253 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
254 | |
255 if (rn) { | |
256 p = &rn->waiting; | |
257 w = rn->waiting; | |
258 | |
259 while (w) { | |
260 if (w == ctx) { | |
261 *p = w->next; | |
262 | |
263 goto done; | |
264 } | |
265 | |
266 p = &w->next; | |
267 w = w->next; | |
268 } | |
269 } | |
270 | |
271 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
272 "could not cancel %V resolving", &ctx->name); | |
273 } | |
274 | |
275 done: | |
276 | |
277 ngx_resolver_expire(r, &r->name_rbtree, &r->name_expire_queue); | |
278 | |
279 /* unlock name mutex */ | |
280 | |
281 ngx_resolver_free(r, ctx); | |
282 } | |
283 | |
284 | |
285 /* NGX_RESOLVE_A only */ | |
286 | |
287 static ngx_int_t | |
288 ngx_resolve_name_locked(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx) | |
289 { | |
290 uint32_t hash; | |
291 in_addr_t addr, *addrs; | |
292 ngx_uint_t naddrs; | |
293 ngx_resolver_ctx_t *next; | |
294 ngx_resolver_node_t *rn; | |
295 | |
296 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
297 | |
298 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
299 | |
300 if (rn) { | |
301 | |
302 if (rn->valid >= ngx_time()) { | |
303 | |
304 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
305 | |
306 ngx_queue_remove(&rn->queue); | |
307 | |
308 rn->expire = ngx_time() + r->expire; | |
309 | |
310 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
311 | |
312 naddrs = rn->naddrs; | |
313 | |
314 if (naddrs) { | |
315 | |
316 /* NGX_RESOLVE_A answer */ | |
317 | |
318 if (naddrs != 1) { | |
319 addr = 0; | |
320 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
321 naddrs * sizeof(in_addr_t)); | |
322 if (addrs == NULL) { | |
323 return NGX_ERROR; | |
324 } | |
325 | |
326 } else { | |
327 addr = rn->u.addr; | |
328 addrs = NULL; | |
329 } | |
330 | |
331 ctx->next = rn->waiting; | |
332 rn->waiting = NULL; | |
333 | |
334 /* unlock name mutex */ | |
335 | |
336 do { | |
337 ctx->state = NGX_OK; | |
338 ctx->naddrs = naddrs; | |
339 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
340 ctx->addr = addr; | |
341 next = ctx->next; | |
342 | |
343 ctx->handler(ctx); | |
344 | |
345 ctx = next; | |
346 } while (ctx); | |
347 | |
348 if (addrs) { | |
349 ngx_resolver_free(r, addrs); | |
350 } | |
351 | |
352 return NGX_OK; | |
353 } | |
354 | |
355 /* NGX_RESOLVE_CNAME */ | |
356 | |
357 ctx->name.len = rn->cnlen; | |
358 ctx->name.data = rn->u.cname; | |
359 | |
360 return ngx_resolve_name_locked(r, ctx); | |
361 } | |
362 | |
363 if (rn->waiting) { | |
364 | |
365 ctx->next = rn->waiting; | |
366 rn->waiting = ctx; | |
367 | |
368 return NGX_AGAIN; | |
369 } | |
370 | |
371 ngx_queue_remove(&rn->queue); | |
372 | |
373 /* lock alloc mutex */ | |
374 | |
375 ngx_resolver_free_locked(r, rn->query); | |
376 | |
377 if (rn->cnlen) { | |
378 ngx_resolver_free_locked(r, rn->u.cname); | |
379 } | |
380 | |
381 if (rn->naddrs > 1) { | |
382 ngx_resolver_free_locked(r, rn->u.addrs); | |
383 } | |
384 | |
385 /* unlock alloc mutex */ | |
386 | |
387 } else { | |
388 | |
389 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
390 if (rn == NULL) { | |
391 return NGX_ERROR; | |
392 } | |
393 | |
394 rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len); | |
395 if (rn->name == NULL) { | |
396 ngx_resolver_free(r, rn); | |
397 return NGX_ERROR; | |
398 } | |
399 | |
400 rn->node.key = hash; | |
401 rn->nlen = (u_short) ctx->name.len; | |
402 | |
403 ngx_rbtree_insert(&r->name_rbtree, &rn->node); | |
404 } | |
405 | |
406 if (ngx_resolver_create_name_query(rn, ctx) != NGX_OK) { | |
407 goto failed; | |
408 } | |
409 | |
410 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
411 goto failed; | |
412 } | |
413 | |
414 if (ctx->event == NULL) { | |
415 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
416 if (ctx->event == NULL) { | |
417 goto failed; | |
418 } | |
419 | |
420 ctx->event->handler = ngx_resolver_timeout_handler; | |
421 ctx->event->data = ctx; | |
422 ctx->event->log = r->log; | |
423 ctx->ident = -1; | |
424 | |
425 ngx_add_timer(ctx->event, ctx->timeout); | |
426 } | |
427 | |
428 if (ngx_queue_empty(&r->name_resend_queue)) { | |
429 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
430 } | |
431 | |
432 rn->expire = ngx_time() + r->resend_timeout; | |
433 | |
434 ngx_queue_insert_head(&r->name_resend_queue, &rn->queue); | |
435 | |
436 rn->cnlen = 0; | |
437 rn->naddrs = 0; | |
438 rn->valid = 0; | |
439 rn->waiting = ctx; | |
440 | |
441 ctx->state = NGX_AGAIN; | |
442 | |
443 return NGX_AGAIN; | |
444 | |
445 failed: | |
446 | |
447 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
448 | |
449 ngx_resolver_free(r, rn->name); | |
450 | |
451 ngx_resolver_free(r, rn); | |
452 | |
453 return NGX_ERROR; | |
454 } | |
583 | 455 |
456 | |
457 ngx_int_t | |
1649 | 458 ngx_resolve_addr(ngx_resolver_ctx_t *ctx) |
459 { | |
460 ngx_resolver_t *r; | |
461 ngx_resolver_node_t *rn; | |
462 | |
463 r = ctx->resolver; | |
464 | |
465 ctx->addr = ntohl(ctx->addr); | |
466 | |
467 /* lock addr mutex */ | |
468 | |
469 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
470 | |
471 if (rn) { | |
472 | |
473 if (rn->valid >= ngx_time()) { | |
474 | |
475 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
476 | |
477 ngx_queue_remove(&rn->queue); | |
478 | |
479 rn->expire = ngx_time() + r->expire; | |
480 | |
481 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
482 | |
483 ctx->name.len = rn->nlen; | |
484 ctx->name.data = ngx_resolver_dup(r, rn->name, rn->nlen); | |
485 if (ctx->name.data == NULL) { | |
486 goto failed; | |
487 } | |
488 | |
489 /* unlock addr mutex */ | |
490 | |
491 ctx->state = NGX_OK; | |
492 | |
493 ctx->handler(ctx); | |
494 | |
495 ngx_resolver_free(r, ctx->name.data); | |
496 | |
497 return NGX_OK; | |
498 } | |
499 | |
500 if (rn->waiting) { | |
501 | |
502 ctx->next = rn->waiting; | |
503 rn->waiting = ctx; | |
504 | |
505 return NGX_AGAIN; | |
506 } | |
507 | |
508 ngx_queue_remove(&rn->queue); | |
509 | |
510 ngx_resolver_free(r, rn->query); | |
511 | |
512 } else { | |
513 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
514 if (rn == NULL) { | |
515 goto failed; | |
516 } | |
517 | |
518 rn->node.key = ctx->addr; | |
519 | |
520 ngx_rbtree_insert(&r->addr_rbtree, &rn->node); | |
521 } | |
522 | |
523 if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) { | |
524 goto failed; | |
525 } | |
526 | |
527 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
528 goto failed; | |
529 } | |
530 | |
531 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
532 if (ctx->event == NULL) { | |
533 goto failed; | |
534 } | |
535 | |
536 ctx->event->handler = ngx_resolver_timeout_handler; | |
537 ctx->event->data = ctx; | |
538 ctx->event->log = r->log; | |
539 ctx->ident = -1; | |
540 | |
541 ngx_add_timer(ctx->event, ctx->timeout); | |
542 | |
543 if (ngx_queue_empty(&r->addr_resend_queue)) { | |
544 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
545 } | |
546 | |
547 rn->expire = ngx_time() + r->resend_timeout; | |
548 | |
549 ngx_queue_insert_head(&r->addr_resend_queue, &rn->queue); | |
550 | |
551 rn->cnlen = 0; | |
552 rn->naddrs = 0; | |
553 rn->name = NULL; | |
554 rn->nlen = 0; | |
555 rn->valid = 0; | |
556 rn->waiting = ctx; | |
557 | |
558 /* unlock addr mutex */ | |
559 | |
560 ctx->state = NGX_AGAIN; | |
561 | |
562 return NGX_OK; | |
563 | |
564 failed: | |
565 | |
566 if (rn) { | |
567 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
568 | |
569 ngx_resolver_free(r, rn); | |
570 } | |
571 | |
572 /* unlock addr mutex */ | |
573 | |
574 /* lock alloc mutex */ | |
575 | |
576 if (ctx->event) { | |
577 ngx_resolver_free_locked(r, ctx->event); | |
578 } | |
579 | |
580 ngx_resolver_free_locked(r, ctx); | |
581 | |
582 /* unlock alloc mutex */ | |
583 | |
584 return NGX_ERROR; | |
585 } | |
586 | |
587 | |
588 void | |
589 ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx) | |
590 { | |
591 in_addr_t addr; | |
592 ngx_resolver_t *r; | |
593 ngx_resolver_ctx_t *w, **p; | |
594 ngx_resolver_node_t *rn; | |
595 | |
596 r = ctx->resolver; | |
597 | |
598 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
599 "resolve addr done: %i", ctx->state); | |
600 | |
601 if (ctx->event && ctx->event->timer_set) { | |
602 ngx_del_timer(ctx->event); | |
603 } | |
604 | |
605 /* lock addr mutex */ | |
606 | |
607 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
608 | |
609 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
610 | |
611 if (rn) { | |
612 p = &rn->waiting; | |
613 w = rn->waiting; | |
614 | |
615 while (w) { | |
616 if (w == ctx) { | |
617 *p = w->next; | |
618 | |
619 goto done; | |
620 } | |
621 | |
622 p = &w->next; | |
623 w = w->next; | |
624 } | |
625 } | |
626 | |
627 addr = ntohl(ctx->addr); | |
628 | |
629 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
630 "could not cancel %ud.%ud.%ud.%ud resolving", | |
631 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
632 (addr >> 8) & 0xff, addr & 0xff); | |
633 } | |
634 | |
635 done: | |
636 | |
637 ngx_resolver_expire(r, &r->addr_rbtree, &r->addr_expire_queue); | |
638 | |
639 /* unlock addr mutex */ | |
640 | |
641 ngx_resolver_free(r, ctx); | |
642 } | |
643 | |
644 | |
645 static void | |
646 ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
647 { | |
648 time_t now; | |
649 ngx_uint_t i; | |
650 ngx_queue_t *q; | |
651 ngx_resolver_node_t *rn; | |
652 | |
653 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire"); | |
654 | |
655 now = ngx_time(); | |
656 | |
657 for (i = 0; i < 2; i++) { | |
658 if (ngx_queue_empty(queue)) { | |
659 return; | |
660 } | |
661 | |
662 q = ngx_queue_last(queue); | |
663 | |
664 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
665 | |
666 if (now <= rn->expire) { | |
667 return; | |
668 } | |
669 | |
1774 | 670 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, |
671 "resolver expire \"%*s\"", (size_t) rn->nlen, rn->name); | |
1649 | 672 |
673 ngx_queue_remove(q); | |
674 | |
675 ngx_rbtree_delete(tree, &rn->node); | |
676 | |
677 ngx_resolver_free_node(r, rn); | |
678 } | |
679 } | |
680 | |
681 | |
682 static ngx_int_t | |
683 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
684 { | |
685 ssize_t n; | |
686 ngx_udp_connection_t *uc; | |
687 | |
688 uc = r->udp_connection; | |
689 | |
690 if (uc->connection == NULL) { | |
691 if (ngx_udp_connect(uc) != NGX_OK) { | |
692 return NGX_ERROR; | |
693 } | |
694 | |
695 uc->connection->data = r; | |
696 uc->connection->read->handler = ngx_resolver_read_response; | |
697 } | |
698 | |
699 n = ngx_send(uc->connection, rn->query, rn->qlen); | |
700 | |
701 if (n == -1) { | |
702 return NGX_ERROR; | |
703 } | |
704 | |
705 if ((size_t) n != (size_t) rn->qlen) { | |
706 ngx_log_error(NGX_LOG_CRIT, uc->log, 0, "send() incomplete"); | |
707 return NGX_ERROR; | |
708 } | |
709 | |
710 return NGX_OK; | |
711 } | |
712 | |
713 | |
714 static void | |
715 ngx_resolver_resend_handler(ngx_event_t *ev) | |
716 { | |
717 time_t timer, atimer, ntimer; | |
718 ngx_resolver_t *r; | |
719 | |
720 r = ev->data; | |
721 | |
722 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, | |
723 "resolver resend handler"); | |
724 | |
725 /* lock name mutex */ | |
726 | |
727 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue); | |
728 | |
729 /* unlock name mutex */ | |
730 | |
731 /* lock addr mutex */ | |
732 | |
733 atimer = ngx_resolver_resend(r, &r->addr_rbtree, &r->addr_resend_queue); | |
1679
ca317d9b5c09
style fix: remove trailing spaces
Igor Sysoev <igor@sysoev.ru>
parents:
1649
diff
changeset
|
734 |
1649 | 735 /* unlock addr mutex */ |
736 | |
737 if (ntimer == 0) { | |
738 timer = atimer; | |
739 | |
740 } else if (atimer == 0) { | |
741 timer = ntimer; | |
742 | |
743 } else { | |
744 timer = (atimer < ntimer) ? atimer : ntimer; | |
745 } | |
746 | |
747 if (timer) { | |
748 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000)); | |
749 } | |
750 } | |
751 | |
752 | |
753 static time_t | |
754 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
755 { | |
756 time_t now; | |
757 ngx_queue_t *q; | |
758 ngx_resolver_node_t *rn; | |
759 | |
760 now = ngx_time(); | |
761 | |
762 for ( ;; ) { | |
763 if (ngx_queue_empty(queue)) { | |
764 return 0; | |
765 } | |
766 | |
767 q = ngx_queue_last(queue); | |
768 | |
769 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
770 | |
771 if (now < rn->expire) { | |
772 return rn->expire - now; | |
773 } | |
774 | |
1774 | 775 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, |
776 "resolver resend \"%*s\" %p", | |
777 (size_t) rn->nlen, rn->name, rn->waiting); | |
1649 | 778 |
779 ngx_queue_remove(q); | |
780 | |
781 if (rn->waiting) { | |
782 | |
783 if (ngx_resolver_send_query(r, rn) == NGX_OK) { | |
784 | |
785 rn->expire = now + r->resend_timeout; | |
786 | |
787 ngx_queue_insert_head(queue, &rn->queue); | |
788 | |
789 continue; | |
790 } | |
791 } | |
792 | |
793 ngx_rbtree_delete(tree, &rn->node); | |
794 | |
795 ngx_resolver_free_node(r, rn); | |
796 } | |
797 } | |
798 | |
799 | |
800 static void | |
801 ngx_resolver_read_response(ngx_event_t *rev) | |
802 { | |
803 ssize_t n; | |
804 ngx_connection_t *c; | |
805 u_char buf[NGX_RESOLVER_UDP_SIZE]; | |
806 | |
807 c = rev->data; | |
808 | |
809 do { | |
1689 | 810 n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE); |
811 | |
812 if (n < 0) { | |
1649 | 813 return; |
814 } | |
815 | |
816 ngx_resolver_process_response(c->data, buf, n); | |
817 | |
818 } while (rev->ready); | |
819 } | |
820 | |
821 | |
822 static void | |
823 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n) | |
824 { | |
825 char *err; | |
826 size_t len; | |
827 ngx_uint_t i, ident, flags, code, nqs, nan, qtype, qclass; | |
828 ngx_resolver_qs_t *qs; | |
829 ngx_resolver_query_t *query; | |
830 | |
831 if ((size_t) n < sizeof(ngx_resolver_query_t) + 1) { | |
832 goto short_response; | |
833 } | |
834 | |
835 query = (ngx_resolver_query_t *) buf; | |
836 | |
837 ident = (query->ident_hi << 8) + query->ident_lo; | |
838 flags = (query->flags_hi << 8) + query->flags_lo; | |
839 nqs = (query->nqs_hi << 8) + query->nqs_lo; | |
840 nan = (query->nan_hi << 8) + query->nan_lo; | |
841 | |
842 ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0, | |
843 "resolver DNS response %d fl:%04Xud %d/%d/%d/%d", | |
844 ident, flags, nqs, nan, | |
845 (query->nns_hi << 8) + query->nns_lo, | |
846 (query->nar_hi << 8) + query->nar_lo); | |
847 | |
848 if (!(flags & 0x8000)) { | |
849 ngx_log_error(r->log_level, r->log, 0, | |
850 "invalid DNS response %d fl:%04Xud", ident, flags); | |
851 return; | |
852 } | |
853 | |
854 code = flags & 0x7f; | |
855 | |
856 if (code == NGX_RESOLVE_FORMERR || code > NGX_RESOLVE_REFUSED) { | |
857 ngx_log_error(r->log_level, r->log, 0, | |
858 "DNS error (%d: %s), query id:%d", | |
859 code, ngx_resolver_strerror(code), ident); | |
860 return; | |
861 } | |
862 | |
863 if (nqs != 1) { | |
864 err = "invalid number of questions in DNS response"; | |
865 goto done; | |
866 } | |
867 | |
868 i = sizeof(ngx_resolver_query_t); | |
869 | |
870 while (i < (ngx_uint_t) n) { | |
871 if (buf[i] == '\0') { | |
872 goto found; | |
873 } | |
874 | |
875 len = buf[i]; | |
876 i += 1 + len; | |
877 } | |
878 | |
879 goto short_response; | |
880 | |
881 found: | |
882 | |
883 if (i++ == 0) { | |
884 err = "zero-length domain name in DNS response"; | |
885 goto done; | |
886 } | |
887 | |
888 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t)) | |
889 > (ngx_uint_t) n) | |
890 { | |
891 goto short_response; | |
892 } | |
893 | |
894 qs = (ngx_resolver_qs_t *) &buf[i]; | |
895 | |
896 qtype = (qs->type_hi << 8) + qs->type_lo; | |
897 qclass = (qs->class_hi << 8) + qs->class_lo; | |
898 | |
899 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
900 "resolver DNS response qt:%d cl:%d", qtype, qclass); | |
901 | |
902 if (qclass != 1) { | |
903 ngx_log_error(r->log_level, r->log, 0, | |
904 "unknown query class %d in DNS response", qclass); | |
905 return; | |
906 } | |
907 | |
908 switch (qtype) { | |
909 | |
910 case NGX_RESOLVE_A: | |
911 | |
912 ngx_resolver_process_a(r, buf, n, ident, code, nan, | |
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
913 i + sizeof(ngx_resolver_qs_t)); |
1649 | 914 |
915 break; | |
916 | |
917 case NGX_RESOLVE_PTR: | |
918 | |
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
919 ngx_resolver_process_ptr(r, buf, n, ident, code, nan); |
1649 | 920 |
921 break; | |
922 | |
923 default: | |
924 ngx_log_error(r->log_level, r->log, 0, | |
925 "unknown query type %d in DNS response", qtype); | |
926 return; | |
927 } | |
928 | |
929 return; | |
930 | |
931 short_response: | |
932 | |
933 err = "short dns response"; | |
934 | |
935 done: | |
936 | |
937 ngx_log_error(r->log_level, r->log, 0, err); | |
938 | |
939 return; | |
940 } | |
941 | |
942 | |
943 static void | |
944 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last, | |
945 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans) | |
583 | 946 { |
1649 | 947 char *err; |
948 u_char *cname; | |
949 size_t len; | |
950 uint32_t hash; | |
951 in_addr_t addr, *addrs; | |
952 ngx_str_t name; | |
953 ngx_uint_t qtype, qident, naddrs, a, i, n, start; | |
954 ngx_resolver_an_t *an; | |
955 ngx_resolver_ctx_t *ctx, *next; | |
956 ngx_resolver_node_t *rn; | |
957 | |
958 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) { | |
959 return; | |
960 } | |
961 | |
962 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); | |
963 | |
964 hash = ngx_crc32_short(name.data, name.len); | |
965 | |
966 /* lock name mutex */ | |
967 | |
968 rn = ngx_resolver_lookup_name(r, &name, hash); | |
969 | |
970 if (rn == NULL || rn->query == NULL) { | |
971 ngx_log_error(r->log_level, r->log, 0, | |
972 "unexpected response for %V", &name); | |
973 goto failed; | |
974 } | |
975 | |
976 qident = (rn->query[0] << 8) + rn->query[1]; | |
977 | |
978 if (ident != qident) { | |
979 ngx_log_error(r->log_level, r->log, 0, | |
980 "wrong ident %d response for %V, expect %d", | |
981 ident, &name, qident); | |
982 goto failed; | |
983 } | |
984 | |
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
985 if (code == 0 && nan == 0) { |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
986 code = 3; /* NXDOMAIN */ |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
987 } |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
988 |
1649 | 989 if (code) { |
990 next = rn->waiting; | |
991 rn->waiting = NULL; | |
992 | |
993 ngx_queue_remove(&rn->queue); | |
994 | |
995 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
996 | |
997 ngx_resolver_free_node(r, rn); | |
998 | |
999 /* unlock name mutex */ | |
1000 | |
1001 while (next) { | |
1002 ctx = next; | |
1003 ctx->state = code; | |
1004 next = ctx->next; | |
1005 | |
1006 ctx->handler(ctx); | |
1007 } | |
1008 | |
1009 return; | |
1010 } | |
1011 | |
1012 i = ans; | |
1013 naddrs = 0; | |
1014 addr = 0; | |
1015 addrs = NULL; | |
1016 cname = NULL; | |
1017 qtype = 0; | |
1018 | |
1019 for (a = 0; a < nan; a++) { | |
1020 | |
1021 start = i; | |
1022 | |
1023 while (i < last) { | |
1024 | |
1025 if (buf[i] & 0xc0) { | |
1026 i += 2; | |
1027 goto found; | |
1028 } | |
1029 | |
1030 if (buf[i] == 0) { | |
1031 i++; | |
1032 goto test_length; | |
1033 } | |
1034 | |
1035 i += 1 + buf[i]; | |
1036 } | |
1037 | |
1038 goto short_response; | |
1039 | |
1040 test_length: | |
1041 | |
1042 if (i - start < 2) { | |
1043 err = "invalid name in dns response"; | |
1044 goto invalid; | |
1045 } | |
1046 | |
1047 found: | |
1048 | |
1049 if (i + sizeof(ngx_resolver_an_t) >= last) { | |
1050 goto short_response; | |
1051 } | |
1052 | |
1053 an = (ngx_resolver_an_t *) &buf[i]; | |
1054 | |
1055 qtype = (an->type_hi << 8) + an->type_lo; | |
1056 len = (an->len_hi << 8) + an->len_lo; | |
1057 | |
1058 if (qtype == NGX_RESOLVE_A) { | |
1059 | |
1060 i += sizeof(ngx_resolver_an_t); | |
1061 | |
1062 if (i + len > last) { | |
1063 goto short_response; | |
1064 } | |
1065 | |
1066 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
1067 + (buf[i + 2] << 8) + (buf[i + 3])); | |
1068 | |
1069 naddrs++; | |
1070 | |
1071 i += len; | |
1072 | |
1073 } else if (qtype == NGX_RESOLVE_CNAME) { | |
1074 cname = &buf[i] + sizeof(ngx_resolver_an_t); | |
1075 i += sizeof(ngx_resolver_an_t) + len; | |
1076 } | |
1077 } | |
1078 | |
1079 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1080 "resolver naddrs:%ui cname:%p", naddrs, cname); | |
1081 | |
1082 if (naddrs) { | |
1083 | |
1084 if (naddrs == 1) { | |
1085 rn->u.addr = addr; | |
1086 | |
1087 } else { | |
1088 | |
1089 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t)); | |
1090 if (addrs == NULL) { | |
1091 return; | |
1092 } | |
1093 | |
1094 n = 0; | |
1095 i = ans; | |
1096 | |
1097 for (a = 0; a < nan; a++) { | |
1098 | |
1099 for ( ;; ) { | |
1100 | |
1101 if (buf[i] & 0xc0) { | |
1102 i += 2; | |
1103 goto ok; | |
1104 } | |
1105 | |
1106 if (buf[i] == 0) { | |
1107 i++; | |
1108 goto ok; | |
1109 } | |
1110 | |
1111 i += 1 + buf[i]; | |
1112 } | |
1113 | |
1114 ok: | |
1115 | |
1116 an = (ngx_resolver_an_t *) &buf[i]; | |
1117 | |
1118 qtype = (an->type_hi << 8) + an->type_lo; | |
1119 len = (an->len_hi << 8) + an->len_lo; | |
1120 | |
1121 i += sizeof(ngx_resolver_an_t); | |
1122 | |
1123 if (qtype == NGX_RESOLVE_A) { | |
1124 | |
1125 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
1126 + (buf[i + 2] << 8) + (buf[i + 3])); | |
1127 | |
1128 if (n == naddrs) { | |
1129 break; | |
1130 } | |
1131 } | |
1132 | |
1133 i += len; | |
1134 } | |
1135 | |
1136 rn->u.addrs = addrs; | |
1137 | |
1138 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
1139 naddrs * sizeof(in_addr_t)); | |
1140 if (addrs == NULL) { | |
1141 return; | |
1142 } | |
1143 } | |
1144 | |
1145 rn->naddrs = (u_short) naddrs; | |
1146 | |
1147 ngx_queue_remove(&rn->queue); | |
1148 | |
1149 rn->valid = ngx_time() + r->valid; | |
1150 rn->expire = ngx_time() + r->expire; | |
1151 | |
1152 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
1153 | |
1154 next = rn->waiting; | |
1155 rn->waiting = NULL; | |
1156 | |
1157 /* unlock name mutex */ | |
1158 | |
1159 while (next) { | |
1160 ctx = next; | |
1161 ctx->state = NGX_OK; | |
1162 ctx->naddrs = naddrs; | |
1163 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
1164 ctx->addr = addr; | |
1165 next = ctx->next; | |
1166 | |
1167 ctx->handler(ctx); | |
1168 } | |
1169 | |
1170 if (naddrs) { | |
1171 ngx_resolver_free(r, addrs); | |
1172 } | |
1173 | |
1174 return; | |
1175 | |
1176 } else if (cname) { | |
1177 | |
1178 /* CNAME only */ | |
1179 | |
1180 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) { | |
1181 return; | |
1182 } | |
1183 | |
1184 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1185 "resolver cname:\"%V\"", &name); | |
1186 | |
1741
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1187 ngx_queue_remove(&rn->queue); |
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1188 |
1649 | 1189 rn->cnlen = (u_short) name.len; |
1190 rn->u.cname = name.data; | |
1191 rn->valid = ngx_time() + r->valid; | |
1192 rn->expire = ngx_time() + r->expire; | |
1193 | |
1194 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
1195 | |
1196 ctx = rn->waiting; | |
1197 rn->waiting = NULL; | |
1198 | |
1199 if (ctx) { | |
1200 ctx->name = name; | |
1201 | |
1202 (void) ngx_resolve_name_locked(r, ctx); | |
1203 } | |
1204 | |
1205 return; | |
1206 } | |
1207 | |
1208 ngx_log_error(r->log_level, r->log, 0, | |
1209 "no A or CNAME types in DNS responses, unknown query type: %d", | |
1210 qtype); | |
1211 return; | |
1212 | |
1213 short_response: | |
1214 | |
1215 err = "short dns response"; | |
1216 | |
1217 invalid: | |
1218 | |
1219 /* unlock name mutex */ | |
1220 | |
1221 ngx_log_error(r->log_level, r->log, 0, err); | |
1222 | |
1223 return; | |
1224 | |
1225 failed: | |
1226 | |
1227 /* unlock name mutex */ | |
1228 | |
1229 return; | |
1230 } | |
1231 | |
1232 | |
1233 static void | |
1234 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
|
1235 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan) |
1649 | 1236 { |
1237 char *err; | |
1238 size_t len; | |
1239 in_addr_t addr; | |
1240 ngx_int_t digit; | |
1241 ngx_str_t name; | |
1242 ngx_uint_t i, mask, qtype, qclass, qident; | |
1243 ngx_resolver_an_t *an; | |
1244 ngx_resolver_ctx_t *ctx, *next; | |
1245 ngx_resolver_node_t *rn; | |
1246 | |
1247 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) { | |
1248 goto invalid_in_addr_arpa; | |
1249 } | |
1250 | |
1251 addr = 0; | |
1252 i = 12; | |
1253 | |
1254 for (mask = 0; mask < 32; mask += 8) { | |
1255 len = buf[i++]; | |
1256 | |
1257 digit = ngx_atoi(&buf[i], len); | |
1258 if (digit == NGX_ERROR || digit > 255) { | |
1259 goto invalid_in_addr_arpa; | |
1260 } | |
1261 | |
1262 addr += digit << mask; | |
1263 i += len; | |
1264 } | |
1265 | |
1266 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) { | |
1267 goto invalid_in_addr_arpa; | |
1268 } | |
1269 | |
1270 /* lock addr mutex */ | |
1271 | |
1272 rn = ngx_resolver_lookup_addr(r, addr); | |
1273 | |
1274 if (rn == NULL || rn->query == NULL) { | |
1275 ngx_log_error(r->log_level, r->log, 0, | |
1276 "unexpected response for %ud.%ud.%ud.%ud", | |
1277 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
1278 (addr >> 8) & 0xff, addr & 0xff); | |
1279 goto failed; | |
1280 } | |
1281 | |
1282 qident = (rn->query[0] << 8) + rn->query[1]; | |
1283 | |
1284 if (ident != qident) { | |
1285 ngx_log_error(r->log_level, r->log, 0, | |
1286 "wrong ident %d response for %ud.%ud.%ud.%ud, expect %d", | |
1287 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
1288 (addr >> 8) & 0xff, addr & 0xff, qident); | |
1289 goto failed; | |
1290 } | |
1291 | |
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1292 if (code == 0 && nan == 0) { |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1293 code = 3; /* NXDOMAIN */ |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1294 } |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1295 |
1649 | 1296 if (code) { |
1297 next = rn->waiting; | |
1298 rn->waiting = NULL; | |
1299 | |
1300 ngx_queue_remove(&rn->queue); | |
1301 | |
1302 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
1303 | |
1304 ngx_resolver_free_node(r, rn); | |
1305 | |
1306 /* unlock addr mutex */ | |
1307 | |
1308 while (next) { | |
1309 ctx = next; | |
1310 ctx->state = code; | |
1311 next = ctx->next; | |
1312 | |
1313 ctx->handler(ctx); | |
1314 } | |
1315 | |
1316 return; | |
1317 } | |
1318 | |
1319 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t); | |
1320 | |
1321 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) { | |
1322 goto short_response; | |
1323 } | |
1324 | |
1325 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */ | |
1326 | |
1327 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) { | |
1328 err = "invalid in-addr.arpa name in DNS response"; | |
1329 goto invalid; | |
1330 } | |
1331 | |
1332 an = (ngx_resolver_an_t *) &buf[i + 2]; | |
1333 | |
1334 qtype = (an->type_hi << 8) + an->type_lo; | |
1335 qclass = (an->class_hi << 8) + an->class_lo; | |
1336 len = (an->len_hi << 8) + an->len_lo; | |
1337 | |
1338 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1339 "resolver qt:%d cl:%d len:%uz", qtype, qclass, len); | |
1340 | |
1341 i += 2 + sizeof(ngx_resolver_an_t); | |
1342 | |
1343 if (i + len > (ngx_uint_t) n) { | |
1344 goto short_response; | |
1345 } | |
1346 | |
1347 len -= 2; | |
1348 | |
1349 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) { | |
1350 return; | |
1351 } | |
1352 | |
1353 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name); | |
1354 | |
1355 if (len != (size_t) rn->nlen || ngx_strncmp(name.data, rn->name, len) != 0) | |
1356 { | |
1357 ngx_resolver_free(r, rn->name); | |
1358 rn->name = name.data; | |
1359 | |
1360 name.data = ngx_resolver_dup(r, rn->name, len); | |
1361 if (name.data == NULL) { | |
1362 goto failed; | |
1363 } | |
1364 } | |
1365 | |
1366 ngx_queue_remove(&rn->queue); | |
1367 | |
1368 rn->valid = ngx_time() + r->valid; | |
1369 rn->expire = ngx_time() + r->expire; | |
1370 | |
1371 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
1372 | |
1373 next = rn->waiting; | |
1374 rn->waiting = NULL; | |
1375 | |
1376 /* unlock addr mutex */ | |
1377 | |
1378 while (next) { | |
1379 ctx = next; | |
1380 ctx->state = NGX_OK; | |
1381 ctx->name = name; | |
1382 next = ctx->next; | |
1383 | |
1384 ctx->handler(ctx); | |
1385 } | |
1386 | |
1387 ngx_resolver_free(r, name.data); | |
1388 | |
1389 return; | |
1390 | |
1391 invalid_in_addr_arpa: | |
1392 | |
1393 ngx_log_error(r->log_level, r->log, 0, | |
1394 "invalid in-addr.arpa name in DNS response"); | |
1395 return; | |
1396 | |
1397 short_response: | |
1398 | |
1399 err = "short DNS response"; | |
1400 | |
1401 invalid: | |
1402 | |
1403 /* unlock addr mutex */ | |
1404 | |
1405 ngx_log_error(r->log_level, r->log, 0, err); | |
1406 | |
1407 return; | |
1408 | |
1409 failed: | |
1410 | |
1411 /* unlock addr mutex */ | |
1412 | |
1413 return; | |
1414 } | |
1415 | |
1416 | |
1417 static ngx_resolver_node_t * | |
1418 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) | |
1419 { | |
1420 ngx_int_t rc; | |
1421 size_t len; | |
1422 ngx_rbtree_node_t *node, *sentinel; | |
1423 ngx_resolver_node_t *rn; | |
1424 | |
1425 node = r->name_rbtree.root; | |
1426 sentinel = r->name_rbtree.sentinel; | |
1427 | |
1428 while (node != sentinel) { | |
1429 | |
1430 if (hash < node->key) { | |
1431 node = node->left; | |
1432 continue; | |
1433 } | |
1434 | |
1435 if (hash > node->key) { | |
1436 node = node->right; | |
1437 continue; | |
1438 } | |
1439 | |
1440 /* hash == node->key */ | |
1441 | |
1442 do { | |
1443 rn = (ngx_resolver_node_t *) node; | |
1444 | |
1445 len = (name->len > (size_t) rn->nlen) ? rn->nlen : name->len; | |
1446 | |
1447 rc = ngx_strncmp(name->data, rn->name, len); | |
1448 | |
1449 if (rc == 0) { | |
1450 return rn; | |
1451 } | |
1452 | |
1453 node = (rc < 0) ? node->left : node->right; | |
1454 | |
1455 } while (node != sentinel && hash == node->key); | |
1456 | |
1457 break; | |
1458 } | |
1459 | |
1460 /* not found */ | |
1461 | |
1462 return NULL; | |
1463 } | |
1464 | |
1465 | |
1466 static ngx_resolver_node_t * | |
1467 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr) | |
1468 { | |
1469 ngx_rbtree_node_t *node, *sentinel; | |
1470 | |
1471 node = r->addr_rbtree.root; | |
1472 sentinel = r->addr_rbtree.sentinel; | |
1473 | |
1474 while (node != sentinel) { | |
1475 | |
1476 if (addr < node->key) { | |
1477 node = node->left; | |
1478 continue; | |
1479 } | |
1480 | |
1481 if (addr > node->key) { | |
1482 node = node->right; | |
1483 continue; | |
1484 } | |
1485 | |
1486 /* addr == node->key */ | |
1487 | |
1488 return (ngx_resolver_node_t *) node; | |
1489 } | |
1490 | |
1491 /* not found */ | |
1492 | |
1493 return NULL; | |
1494 } | |
1495 | |
1496 | |
1497 static void | |
1498 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
1499 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
1500 { | |
1501 size_t len; | |
1502 ngx_rbtree_node_t **p; | |
1503 ngx_resolver_node_t *rn, *rn_temp; | |
1504 | |
1505 for ( ;; ) { | |
1506 | |
1507 if (node->key < temp->key) { | |
1508 | |
1509 p = &temp->left; | |
1510 | |
1511 } else if (node->key > temp->key) { | |
1512 | |
1513 p = &temp->right; | |
1514 | |
1515 } else { /* node->key == temp->key */ | |
1516 | |
1517 rn = (ngx_resolver_node_t *) node; | |
1518 rn_temp = (ngx_resolver_node_t *) temp; | |
1519 | |
1520 len = (rn->nlen > rn_temp->nlen) ? rn_temp->nlen : rn->nlen; | |
1521 | |
1522 p = (ngx_strncmp(rn->name, rn_temp->name, len) < 0) | |
1523 ? &temp->left : &temp->right; | |
1524 } | |
1525 | |
1526 if (*p == sentinel) { | |
1527 break; | |
1528 } | |
1529 | |
1530 temp = *p; | |
1531 } | |
1532 | |
1533 *p = node; | |
1534 node->parent = temp; | |
1535 node->left = sentinel; | |
1536 node->right = sentinel; | |
1537 ngx_rbt_red(node); | |
1538 } | |
1539 | |
1540 | |
1541 static ngx_int_t | |
1542 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
1543 { | |
1544 u_char *p, *s; | |
1545 size_t len; | |
1546 ngx_uint_t ident; | |
1547 ngx_resolver_qs_t *qs; | |
1548 ngx_resolver_query_t *query; | |
1549 | |
1550 len = sizeof(ngx_resolver_query_t) | |
1551 + 1 + ctx->name.len + 1 + sizeof(ngx_resolver_qs_t); | |
1552 | |
1553 p = ngx_resolver_calloc(ctx->resolver, len); | |
1554 if (p == NULL) { | |
1555 return NGX_ERROR; | |
1556 } | |
1557 | |
1558 rn->qlen = (u_short) len; | |
1559 rn->query = p; | |
1560 | |
1561 query = (ngx_resolver_query_t *) p; | |
1562 | |
1563 ident = ngx_random(); | |
1564 | |
1565 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0, | |
1566 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff); | |
1567 | |
1568 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
1569 query->ident_lo = (u_char) (ident & 0xff); | |
1570 | |
1571 /* recursion query */ | |
1572 query->flags_hi = 1; query->flags_lo = 0; | |
1573 | |
1574 /* one question */ | |
1575 query->nqs_hi = 0; query->nqs_lo = 1; | |
1576 query->nan_hi = 0; query->nan_lo = 0; | |
1577 query->nns_hi = 0; query->nns_lo = 0; | |
1578 query->nar_hi = 0; query->nar_lo = 0; | |
1579 | |
1580 p += sizeof(ngx_resolver_query_t) + 1 + ctx->name.len + 1; | |
1581 | |
1582 qs = (ngx_resolver_qs_t *) p; | |
1583 | |
1584 /* query type */ | |
1585 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type; | |
1586 | |
1587 /* IP query class */ | |
1588 qs->class_hi = 0; qs->class_lo = 1; | |
1589 | |
1590 /* convert "www.example.com" to "\3www\7example\3com\0" */ | |
1591 | |
1592 len = 0; | |
1593 p--; | |
1594 *p-- = '\0'; | |
1595 | |
1596 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) { | |
1597 if (*s != '.') { | |
1598 *p = *s; | |
1599 len++; | |
1600 | |
1601 } else { | |
1602 *p = (u_char) len; | |
1603 len = 0; | |
1604 } | |
1605 | |
1606 p--; | |
1607 } | |
1608 | |
1609 *p = (u_char) len; | |
1610 | |
1611 return NGX_OK; | |
1612 } | |
1613 | |
1614 | |
1615 /* AF_INET only */ | |
1616 | |
1617 static ngx_int_t | |
1618 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
1619 { | |
1620 u_char *p, *d; | |
1621 size_t len; | |
1622 ngx_int_t n; | |
1623 ngx_uint_t ident; | |
1624 ngx_resolver_query_t *query; | |
1625 | |
1626 len = sizeof(ngx_resolver_query_t) | |
1627 + sizeof(".255.255.255.255.in-addr.arpa.") - 1 | |
1628 + sizeof(ngx_resolver_qs_t); | |
1629 | |
1630 p = ngx_resolver_calloc(ctx->resolver, len); | |
1631 if (p == NULL) { | |
1632 return NGX_ERROR; | |
1633 } | |
1634 | |
1635 rn->query = p; | |
1636 query = (ngx_resolver_query_t *) p; | |
1637 | |
1638 ident = ngx_random(); | |
1639 | |
1640 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
1641 query->ident_lo = (u_char) (ident & 0xff); | |
1642 | |
1643 /* recursion query */ | |
1644 query->flags_hi = 1; query->flags_lo = 0; | |
1645 | |
1646 /* one question */ | |
1647 query->nqs_hi = 0; query->nqs_lo = 1; | |
1648 query->nan_hi = 0; query->nan_lo = 0; | |
1649 query->nns_hi = 0; query->nns_lo = 0; | |
1650 query->nar_hi = 0; query->nar_lo = 0; | |
1651 | |
1652 p += sizeof(ngx_resolver_query_t); | |
1653 | |
1654 for (n = 0; n < 32; n += 8){ | |
1655 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff); | |
1656 *p = (u_char) (d - &p[1]); | |
1657 p = d; | |
1658 } | |
1659 | |
1660 /* query type "PTR", IP query class */ | |
1661 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18); | |
1662 | |
1663 rn->qlen = (u_short) | |
1664 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t) | |
1665 - rn->query); | |
1666 | |
1667 return NGX_OK; | |
1668 } | |
1669 | |
1670 | |
1671 static ngx_int_t | |
1672 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src, | |
1673 u_char *last) | |
1674 { | |
1675 char *err; | |
1676 u_char *p, *dst; | |
1677 ssize_t len; | |
1678 ngx_uint_t i, n; | |
1679 | |
1680 p = src; | |
1681 len = -1; | |
1682 | |
1683 /* | |
1684 * compression pointers allow to create endless loop, so we set limit; | |
1685 * 128 pointers should be enough to store 255-byte name | |
1686 */ | |
1687 | |
1688 for (i = 0; i < 128; i++) { | |
1689 n = *p++; | |
1690 | |
1691 if (n == 0) { | |
1692 goto done; | |
1693 } | |
1694 | |
1695 if (n & 0xc0) { | |
1696 n = (n & 0x3f << 8) + *p; | |
1697 p = &buf[n]; | |
1698 | |
1699 } else { | |
1700 len += 1 + n; | |
1701 p = &p[n]; | |
1702 } | |
1703 | |
1704 if (p >= last) { | |
1705 err = "name is out of response"; | |
1706 goto invalid; | |
1707 } | |
1708 } | |
1709 | |
1710 err = "compression pointers loop"; | |
1711 | |
1712 invalid: | |
1713 | |
1714 ngx_log_error(r->log_level, r->log, 0, err); | |
1715 | |
1716 return NGX_ERROR; | |
1717 | |
1718 done: | |
1719 | |
1720 if (name == NULL) { | |
583 | 1721 return NGX_OK; |
1722 } | |
1723 | |
1649 | 1724 dst = ngx_resolver_alloc(r, len); |
1725 if (dst == NULL) { | |
1726 return NGX_ERROR; | |
1727 } | |
1728 | |
1729 name->data = dst; | |
1730 | |
1731 n = *src++; | |
1732 | |
1733 for ( ;; ) { | |
1734 if (n != 0xc0) { | |
1735 ngx_memcpy(dst, src, n); | |
1736 dst += n; | |
1737 src += n; | |
1738 | |
1739 n = *src++; | |
1740 | |
1741 if (n != 0) { | |
1742 *dst++ = '.'; | |
1743 } | |
1744 | |
1745 } else { | |
1746 n = (n & 0x3f << 8) + *src; | |
1747 src = &buf[n]; | |
1748 | |
1749 n = *src++; | |
1750 } | |
1751 | |
1752 if (n == 0) { | |
1753 name->len = dst - name->data; | |
1754 return NGX_OK; | |
1755 } | |
1756 } | |
1757 } | |
1758 | |
1759 | |
1760 static void | |
1761 ngx_resolver_timeout_handler(ngx_event_t *ev) | |
1762 { | |
1763 ngx_resolver_ctx_t *ctx; | |
1764 | |
1765 ctx = ev->data; | |
1766 | |
1767 ctx->state = NGX_RESOLVE_TIMEDOUT; | |
1768 | |
1769 ctx->handler(ctx); | |
1770 } | |
1771 | |
1772 | |
1773 static void | |
1774 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
1775 { | |
1776 /* lock alloc mutex */ | |
1777 | |
1778 if (rn->query) { | |
1779 ngx_resolver_free_locked(r, rn->query); | |
1780 } | |
1781 | |
1782 if (rn->name) { | |
1783 ngx_resolver_free_locked(r, rn->name); | |
1784 } | |
1785 | |
1786 if (rn->cnlen) { | |
1787 ngx_resolver_free_locked(r, rn->u.cname); | |
1788 } | |
1789 | |
1790 if (rn->naddrs > 1) { | |
1791 ngx_resolver_free_locked(r, rn->u.addrs); | |
1792 } | |
1793 | |
1794 ngx_resolver_free_locked(r, rn); | |
1795 | |
1796 /* unlock alloc mutex */ | |
1797 } | |
1798 | |
1799 | |
1800 static void * | |
1801 ngx_resolver_alloc(ngx_resolver_t *r, size_t size) | |
1802 { | |
1803 u_char *p; | |
1804 | |
1805 /* lock alloc mutex */ | |
1806 | |
1807 p = ngx_alloc(size, r->log); | |
1808 | |
1809 /* unlock alloc mutex */ | |
1810 | |
1811 return p; | |
1812 } | |
1813 | |
1814 | |
1815 void * | |
1816 ngx_resolver_calloc(ngx_resolver_t *r, size_t size) | |
1817 { | |
1818 u_char *p; | |
1819 | |
1820 p = ngx_resolver_alloc(r, size); | |
1821 | |
1822 if (p) { | |
1823 ngx_memzero(p, size); | |
1824 } | |
1825 | |
1826 return p; | |
1827 } | |
1828 | |
1829 | |
1830 static void | |
1831 ngx_resolver_free(ngx_resolver_t *r, void *p) | |
1832 { | |
1833 /* lock alloc mutex */ | |
1834 | |
1835 ngx_free(p); | |
1836 | |
1837 /* unlock alloc mutex */ | |
1838 } | |
1839 | |
1840 | |
1841 static void | |
1842 ngx_resolver_free_locked(ngx_resolver_t *r, void *p) | |
1843 { | |
1844 ngx_free(p); | |
1845 } | |
1846 | |
1847 | |
1848 static void * | |
1849 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size) | |
1850 { | |
1851 void *dst; | |
1852 | |
1853 dst = ngx_resolver_alloc(r, size); | |
1854 | |
1855 if (dst == NULL) { | |
1856 return dst; | |
1857 } | |
1858 | |
1859 ngx_memcpy(dst, src, size); | |
1860 | |
1861 return dst; | |
1862 } | |
1863 | |
1864 | |
1865 char * | |
1866 ngx_resolver_strerror(ngx_int_t err) | |
1867 { | |
1868 static char *errors[] = { | |
1869 "Format error", /* FORMERR */ | |
1870 "Server failure", /* SERVFAIL */ | |
1871 "Host not found", /* NXDOMAIN */ | |
1872 "Unimplemented", /* NOTIMP */ | |
1873 "Operation refused" /* REFUSED */ | |
1874 }; | |
1875 | |
1876 if (err > 0 && err < 6) { | |
1877 return errors[err - 1]; | |
1878 } | |
1879 | |
1880 if (err == NGX_RESOLVE_TIMEDOUT) { | |
1881 return "Operation timed out"; | |
1882 } | |
1883 | |
1884 return "Unknown error"; | |
1885 } | |
1886 | |
1887 | |
1888 ngx_int_t | |
1889 ngx_udp_connect(ngx_udp_connection_t *uc) | |
1890 { | |
1891 int rc; | |
1892 ngx_int_t event; | |
1893 ngx_event_t *rev, *wev; | |
1894 ngx_socket_t s; | |
1895 ngx_connection_t *c; | |
1896 | |
583 | 1897 s = ngx_socket(AF_INET, SOCK_DGRAM, 0); |
1898 | |
1649 | 1899 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, uc->log, 0, "UDP socket %d", s); |
583 | 1900 |
1901 if (s == -1) { | |
1649 | 1902 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
583 | 1903 ngx_socket_n " failed"); |
1904 return NGX_ERROR; | |
1905 } | |
1906 | |
1649 | 1907 c = ngx_get_connection(s, uc->log); |
583 | 1908 |
1909 if (c == NULL) { | |
1910 if (ngx_close_socket(s) == -1) { | |
1649 | 1911 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
583 | 1912 ngx_close_socket_n "failed"); |
1913 } | |
1914 | |
1915 return NGX_ERROR; | |
1916 } | |
1917 | |
1649 | 1918 if (ngx_nonblocking(s) == -1) { |
1919 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
1920 ngx_nonblocking_n " failed"); | |
1921 | |
1922 ngx_free_connection(c); | |
1923 | |
1924 if (ngx_close_socket(s) == -1) { | |
1925 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
1926 ngx_close_socket_n " failed"); | |
1927 } | |
1928 | |
1929 return NGX_ERROR; | |
1930 } | |
1931 | |
583 | 1932 rev = c->read; |
1933 wev = c->write; | |
1934 | |
1649 | 1935 rev->log = uc->log; |
1936 wev->log = uc->log; | |
1937 | |
1938 uc->connection = c; | |
583 | 1939 |
1940 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); | |
1941 | |
1942 #if (NGX_THREADS) | |
1649 | 1943 |
1944 /* TODO: lock event when call completion handler */ | |
1945 | |
1946 rev->lock = &c->lock; | |
1947 wev->lock = &c->lock; | |
583 | 1948 rev->own_lock = &c->lock; |
1949 wev->own_lock = &c->lock; | |
1649 | 1950 |
583 | 1951 #endif |
1952 | |
1649 | 1953 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, uc->log, 0, |
1954 "connect to %V, fd:%d #%d", &uc->server, s, c->number); | |
1955 | |
1956 rc = connect(s, uc->sockaddr, uc->socklen); | |
1957 | |
1958 /* TODO: aio, iocp */ | |
583 | 1959 |
1960 if (rc == -1) { | |
1649 | 1961 ngx_log_error(NGX_LOG_CRIT, uc->log, ngx_socket_errno, |
1962 "connect() to %V failed", &uc->server); | |
583 | 1963 |
1964 return NGX_ERROR; | |
1965 } | |
1966 | |
1649 | 1967 /* UDP sockets are always ready to write */ |
1968 wev->ready = 1; | |
1969 | |
1970 if (ngx_add_event) { | |
1971 | |
1972 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ? | |
1973 /* kqueue, epoll */ NGX_CLEAR_EVENT: | |
1974 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT; | |
1975 /* eventport event type has no meaning: oneshot only */ | |
1976 | |
1977 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { | |
1978 return NGX_ERROR; | |
1979 } | |
1980 | |
1981 } else { | |
1982 /* rtsig */ | |
1983 | |
583 | 1984 if (ngx_add_conn(c) == NGX_ERROR) { |
1985 return NGX_ERROR; | |
1986 } | |
1987 } | |
1988 | |
1989 return NGX_OK; | |
1990 } |