Mercurial > hg > nginx
annotate src/core/ngx_resolver.c @ 1683:1e0b028055ec
allow to use IP addresses without defined resolver
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Mon, 03 Dec 2007 10:05:19 +0000 |
parents | ca317d9b5c09 |
children | a24c909ad879 |
rev | line source |
---|---|
583 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4 */ | |
5 | |
6 | |
7 #include <ngx_config.h> | |
8 #include <ngx_core.h> | |
9 #include <ngx_event.h> | |
10 | |
11 | |
1649 | 12 #define NGX_RESOLVER_UDP_SIZE 4096 |
13 | |
14 | |
583 | 15 typedef struct { |
1649 | 16 u_char ident_hi; |
17 u_char ident_lo; | |
18 u_char flags_hi; | |
19 u_char flags_lo; | |
20 u_char nqs_hi; | |
21 u_char nqs_lo; | |
22 u_char nan_hi; | |
23 u_char nan_lo; | |
24 u_char nns_hi; | |
25 u_char nns_lo; | |
26 u_char nar_hi; | |
27 u_char nar_lo; | |
28 } ngx_resolver_query_t; | |
29 | |
30 | |
31 typedef struct { | |
32 u_char type_hi; | |
33 u_char type_lo; | |
34 u_char class_hi; | |
35 u_char class_lo; | |
36 } ngx_resolver_qs_t; | |
37 | |
38 | |
39 typedef struct { | |
40 u_char type_hi; | |
41 u_char type_lo; | |
42 u_char class_hi; | |
43 u_char class_lo; | |
44 u_char ttl[4]; | |
45 u_char len_hi; | |
46 u_char len_lo; | |
47 } ngx_resolver_an_t; | |
48 | |
49 | |
50 ngx_int_t ngx_udp_connect(ngx_udp_connection_t *uc); | |
51 | |
52 | |
53 static ngx_int_t ngx_resolve_name_locked(ngx_resolver_t *r, | |
54 ngx_resolver_ctx_t *ctx); | |
55 static void ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
56 ngx_queue_t *queue); | |
57 static ngx_int_t ngx_resolver_send_query(ngx_resolver_t *r, | |
58 ngx_resolver_node_t *rn); | |
59 static ngx_int_t ngx_resolver_create_name_query(ngx_resolver_node_t *rn, | |
60 ngx_resolver_ctx_t *ctx); | |
61 static ngx_int_t ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, | |
62 ngx_resolver_ctx_t *ctx); | |
63 static void ngx_resolver_resend_handler(ngx_event_t *ev); | |
64 static time_t ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
65 ngx_queue_t *queue); | |
66 static void ngx_resolver_read_response(ngx_event_t *rev); | |
67 static void ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, | |
68 size_t n); | |
69 static void ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t n, | |
70 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t i); | |
71 static void ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, | |
72 ngx_uint_t ident, ngx_uint_t code); | |
73 static ngx_resolver_node_t *ngx_resolver_lookup_name(ngx_resolver_t *r, | |
74 ngx_str_t *name, uint32_t hash); | |
75 static ngx_resolver_node_t *ngx_resolver_lookup_addr(ngx_resolver_t *r, | |
76 in_addr_t addr); | |
77 static void ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
78 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel); | |
79 static ngx_int_t ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, | |
80 u_char *buf, u_char *src, u_char *last); | |
81 static void ngx_resolver_timeout_handler(ngx_event_t *ev); | |
82 static void ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn); | |
83 static void *ngx_resolver_alloc(ngx_resolver_t *r, size_t size); | |
84 static void ngx_resolver_free(ngx_resolver_t *r, void *p); | |
85 static void ngx_resolver_free_locked(ngx_resolver_t *r, void *p); | |
86 static void *ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size); | |
87 | |
88 | |
89 /* STUB: ngx_peer_addr_t * */ | |
90 | |
91 ngx_resolver_t * | |
92 ngx_resolver_create(ngx_peer_addr_t *addr, ngx_log_t *log) | |
93 { | |
94 ngx_resolver_t *r; | |
95 ngx_udp_connection_t *uc; | |
96 | |
97 r = ngx_calloc(sizeof(ngx_resolver_t), log); | |
98 if (r == NULL) { | |
99 return NULL; | |
100 } | |
101 | |
102 r->event = ngx_calloc(sizeof(ngx_event_t), log); | |
103 if (r->event == NULL) { | |
104 return NULL; | |
105 } | |
106 | |
107 ngx_rbtree_sentinel_init(&r->name_sentinel); | |
108 | |
109 r->name_rbtree.root = &r->name_sentinel; | |
110 r->name_rbtree.sentinel = &r->name_sentinel; | |
111 r->name_rbtree.insert = ngx_resolver_rbtree_insert_value; | |
112 | |
113 ngx_rbtree_sentinel_init(&r->addr_sentinel); | |
114 | |
115 r->addr_rbtree.root = &r->addr_sentinel; | |
116 r->addr_rbtree.sentinel = &r->addr_sentinel; | |
117 r->addr_rbtree.insert = ngx_rbtree_insert_value; | |
118 | |
119 r->name_resend_queue.prev = &r->name_resend_queue; | |
120 r->name_resend_queue.next = &r->name_resend_queue; | |
121 | |
122 r->addr_resend_queue.prev = &r->addr_resend_queue; | |
123 r->addr_resend_queue.next = &r->addr_resend_queue; | |
124 | |
125 r->name_expire_queue.prev = &r->name_expire_queue; | |
126 r->name_expire_queue.next = &r->name_expire_queue; | |
127 | |
128 r->addr_expire_queue.prev = &r->addr_expire_queue; | |
129 r->addr_expire_queue.next = &r->addr_expire_queue; | |
130 | |
131 r->event->handler = ngx_resolver_resend_handler; | |
132 r->event->data = r; | |
133 r->event->log = log; | |
134 r->ident = -1; | |
135 | |
136 r->resend_timeout = 5; | |
137 r->expire = 30; | |
138 r->valid = 300; | |
139 | |
140 r->log = log; | |
141 r->log_level = NGX_LOG_ALERT; | |
142 | |
1683
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
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143 if (addr) { |
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allow to use IP addresses without defined resolver
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parents:
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144 uc = ngx_calloc(sizeof(ngx_udp_connection_t), log); |
1e0b028055ec
allow to use IP addresses without defined resolver
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parents:
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145 if (uc == NULL) { |
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allow to use IP addresses without defined resolver
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parents:
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146 return NULL; |
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
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147 } |
1e0b028055ec
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Igor Sysoev <igor@sysoev.ru>
parents:
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148 |
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149 r->udp_connection = uc; |
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parents:
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150 |
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parents:
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151 uc->sockaddr = addr->sockaddr; |
1e0b028055ec
allow to use IP addresses without defined resolver
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parents:
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152 uc->socklen = addr->socklen; |
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parents:
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153 uc->server = addr->name; |
1e0b028055ec
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parents:
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154 uc->log = log; |
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
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155 } |
1649 | 156 |
157 return r; | |
158 } | |
159 | |
160 | |
161 ngx_resolver_ctx_t * | |
162 ngx_resolve_start(ngx_resolver_t *r, ngx_resolver_ctx_t *temp) | |
163 { | |
164 in_addr_t addr; | |
165 ngx_resolver_ctx_t *ctx; | |
166 | |
167 if (temp) { | |
168 addr = ngx_inet_addr(temp->name.data, temp->name.len); | |
169 | |
170 if (addr != INADDR_NONE) { | |
171 temp->resolver = r; | |
172 temp->state = NGX_OK; | |
173 temp->naddrs = 1; | |
174 temp->addrs = &temp->addr; | |
175 temp->addr = addr; | |
176 temp->quick = 1; | |
177 | |
178 return temp; | |
179 } | |
180 } | |
181 | |
1683
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
|
182 if (r->udp_connection == NULL) { |
1e0b028055ec
allow to use IP addresses without defined resolver
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parents:
1679
diff
changeset
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183 return NGX_NO_RESOLVER; |
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
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184 } |
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parents:
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diff
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185 |
1649 | 186 ctx = ngx_resolver_calloc(r, sizeof(ngx_resolver_ctx_t)); |
187 | |
188 if (ctx) { | |
189 ctx->resolver = r; | |
190 } | |
191 | |
192 return ctx; | |
193 } | |
194 | |
195 | |
196 ngx_int_t | |
197 ngx_resolve_name(ngx_resolver_ctx_t *ctx) | |
198 { | |
199 ngx_int_t rc; | |
200 ngx_resolver_t *r; | |
201 | |
202 r = ctx->resolver; | |
203 | |
204 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
205 "resolve: \"%V\"", &ctx->name); | |
206 | |
207 if (ctx->quick) { | |
208 ctx->handler(ctx); | |
209 return NGX_OK; | |
210 } | |
211 | |
212 /* lock name mutex */ | |
213 | |
214 rc = ngx_resolve_name_locked(r, ctx); | |
215 | |
216 if (rc == NGX_OK) { | |
217 return NGX_OK; | |
218 } | |
219 | |
220 /* unlock name mutex */ | |
221 | |
222 if (rc == NGX_AGAIN) { | |
223 return NGX_OK; | |
224 } | |
225 | |
226 /* lock alloc mutex */ | |
227 | |
228 if (ctx->event) { | |
229 ngx_resolver_free_locked(r, ctx->event); | |
230 } | |
231 | |
232 ngx_resolver_free_locked(r, ctx); | |
233 | |
234 /* unlock alloc mutex */ | |
235 | |
236 return NGX_ERROR; | |
237 } | |
238 | |
239 | |
240 void | |
241 ngx_resolve_name_done(ngx_resolver_ctx_t *ctx) | |
242 { | |
243 uint32_t hash; | |
244 ngx_resolver_t *r; | |
245 ngx_resolver_ctx_t *w, **p; | |
246 ngx_resolver_node_t *rn; | |
247 | |
248 r = ctx->resolver; | |
249 | |
250 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
251 "resolve name done: %i", ctx->state); | |
252 | |
253 if (ctx->quick) { | |
254 return; | |
255 } | |
256 | |
257 if (ctx->event && ctx->event->timer_set) { | |
258 ngx_del_timer(ctx->event); | |
259 } | |
260 | |
261 /* lock name mutex */ | |
262 | |
263 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
264 | |
265 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
266 | |
267 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
268 | |
269 if (rn) { | |
270 p = &rn->waiting; | |
271 w = rn->waiting; | |
272 | |
273 while (w) { | |
274 if (w == ctx) { | |
275 *p = w->next; | |
276 | |
277 goto done; | |
278 } | |
279 | |
280 p = &w->next; | |
281 w = w->next; | |
282 } | |
283 } | |
284 | |
285 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
286 "could not cancel %V resolving", &ctx->name); | |
287 } | |
288 | |
289 done: | |
290 | |
291 ngx_resolver_expire(r, &r->name_rbtree, &r->name_expire_queue); | |
292 | |
293 /* unlock name mutex */ | |
294 | |
295 ngx_resolver_free(r, ctx); | |
296 } | |
297 | |
298 | |
299 /* NGX_RESOLVE_A only */ | |
300 | |
301 static ngx_int_t | |
302 ngx_resolve_name_locked(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx) | |
303 { | |
304 uint32_t hash; | |
305 in_addr_t addr, *addrs; | |
306 ngx_uint_t naddrs; | |
307 ngx_resolver_ctx_t *next; | |
308 ngx_resolver_node_t *rn; | |
309 | |
310 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
311 | |
312 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
313 | |
314 if (rn) { | |
315 | |
316 if (rn->valid >= ngx_time()) { | |
317 | |
318 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
319 | |
320 ngx_queue_remove(&rn->queue); | |
321 | |
322 rn->expire = ngx_time() + r->expire; | |
323 | |
324 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
325 | |
326 naddrs = rn->naddrs; | |
327 | |
328 if (naddrs) { | |
329 | |
330 /* NGX_RESOLVE_A answer */ | |
331 | |
332 if (naddrs != 1) { | |
333 addr = 0; | |
334 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
335 naddrs * sizeof(in_addr_t)); | |
336 if (addrs == NULL) { | |
337 return NGX_ERROR; | |
338 } | |
339 | |
340 } else { | |
341 addr = rn->u.addr; | |
342 addrs = NULL; | |
343 } | |
344 | |
345 ctx->next = rn->waiting; | |
346 rn->waiting = NULL; | |
347 | |
348 /* unlock name mutex */ | |
349 | |
350 do { | |
351 ctx->state = NGX_OK; | |
352 ctx->naddrs = naddrs; | |
353 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
354 ctx->addr = addr; | |
355 next = ctx->next; | |
356 | |
357 ctx->handler(ctx); | |
358 | |
359 ctx = next; | |
360 } while (ctx); | |
361 | |
362 if (addrs) { | |
363 ngx_resolver_free(r, addrs); | |
364 } | |
365 | |
366 return NGX_OK; | |
367 } | |
368 | |
369 /* NGX_RESOLVE_CNAME */ | |
370 | |
371 ctx->name.len = rn->cnlen; | |
372 ctx->name.data = rn->u.cname; | |
373 | |
374 return ngx_resolve_name_locked(r, ctx); | |
375 } | |
376 | |
377 if (rn->waiting) { | |
378 | |
379 ctx->next = rn->waiting; | |
380 rn->waiting = ctx; | |
381 | |
382 return NGX_AGAIN; | |
383 } | |
384 | |
385 ngx_queue_remove(&rn->queue); | |
386 | |
387 /* lock alloc mutex */ | |
388 | |
389 ngx_resolver_free_locked(r, rn->query); | |
390 | |
391 if (rn->cnlen) { | |
392 ngx_resolver_free_locked(r, rn->u.cname); | |
393 } | |
394 | |
395 if (rn->naddrs > 1) { | |
396 ngx_resolver_free_locked(r, rn->u.addrs); | |
397 } | |
398 | |
399 /* unlock alloc mutex */ | |
400 | |
401 } else { | |
402 | |
403 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
404 if (rn == NULL) { | |
405 return NGX_ERROR; | |
406 } | |
407 | |
408 rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len); | |
409 if (rn->name == NULL) { | |
410 ngx_resolver_free(r, rn); | |
411 return NGX_ERROR; | |
412 } | |
413 | |
414 rn->node.key = hash; | |
415 rn->nlen = (u_short) ctx->name.len; | |
416 | |
417 ngx_rbtree_insert(&r->name_rbtree, &rn->node); | |
418 } | |
419 | |
420 if (ngx_resolver_create_name_query(rn, ctx) != NGX_OK) { | |
421 goto failed; | |
422 } | |
423 | |
424 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
425 goto failed; | |
426 } | |
427 | |
428 if (ctx->event == NULL) { | |
429 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
430 if (ctx->event == NULL) { | |
431 goto failed; | |
432 } | |
433 | |
434 ctx->event->handler = ngx_resolver_timeout_handler; | |
435 ctx->event->data = ctx; | |
436 ctx->event->log = r->log; | |
437 ctx->ident = -1; | |
438 | |
439 ngx_add_timer(ctx->event, ctx->timeout); | |
440 } | |
441 | |
442 if (ngx_queue_empty(&r->name_resend_queue)) { | |
443 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
444 } | |
445 | |
446 rn->expire = ngx_time() + r->resend_timeout; | |
447 | |
448 ngx_queue_insert_head(&r->name_resend_queue, &rn->queue); | |
449 | |
450 rn->cnlen = 0; | |
451 rn->naddrs = 0; | |
452 rn->valid = 0; | |
453 rn->waiting = ctx; | |
454 | |
455 ctx->state = NGX_AGAIN; | |
456 | |
457 return NGX_AGAIN; | |
458 | |
459 failed: | |
460 | |
461 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
462 | |
463 ngx_resolver_free(r, rn->name); | |
464 | |
465 ngx_resolver_free(r, rn); | |
466 | |
467 return NGX_ERROR; | |
468 } | |
583 | 469 |
470 | |
471 ngx_int_t | |
1649 | 472 ngx_resolve_addr(ngx_resolver_ctx_t *ctx) |
473 { | |
474 ngx_resolver_t *r; | |
475 ngx_resolver_node_t *rn; | |
476 | |
477 r = ctx->resolver; | |
478 | |
479 ctx->addr = ntohl(ctx->addr); | |
480 | |
481 /* lock addr mutex */ | |
482 | |
483 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
484 | |
485 if (rn) { | |
486 | |
487 if (rn->valid >= ngx_time()) { | |
488 | |
489 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
490 | |
491 ngx_queue_remove(&rn->queue); | |
492 | |
493 rn->expire = ngx_time() + r->expire; | |
494 | |
495 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
496 | |
497 ctx->name.len = rn->nlen; | |
498 ctx->name.data = ngx_resolver_dup(r, rn->name, rn->nlen); | |
499 if (ctx->name.data == NULL) { | |
500 goto failed; | |
501 } | |
502 | |
503 /* unlock addr mutex */ | |
504 | |
505 ctx->state = NGX_OK; | |
506 | |
507 ctx->handler(ctx); | |
508 | |
509 ngx_resolver_free(r, ctx->name.data); | |
510 | |
511 return NGX_OK; | |
512 } | |
513 | |
514 if (rn->waiting) { | |
515 | |
516 ctx->next = rn->waiting; | |
517 rn->waiting = ctx; | |
518 | |
519 return NGX_AGAIN; | |
520 } | |
521 | |
522 ngx_queue_remove(&rn->queue); | |
523 | |
524 ngx_resolver_free(r, rn->query); | |
525 | |
526 } else { | |
527 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
528 if (rn == NULL) { | |
529 goto failed; | |
530 } | |
531 | |
532 rn->node.key = ctx->addr; | |
533 | |
534 ngx_rbtree_insert(&r->addr_rbtree, &rn->node); | |
535 } | |
536 | |
537 if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) { | |
538 goto failed; | |
539 } | |
540 | |
541 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
542 goto failed; | |
543 } | |
544 | |
545 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
546 if (ctx->event == NULL) { | |
547 goto failed; | |
548 } | |
549 | |
550 ctx->event->handler = ngx_resolver_timeout_handler; | |
551 ctx->event->data = ctx; | |
552 ctx->event->log = r->log; | |
553 ctx->ident = -1; | |
554 | |
555 ngx_add_timer(ctx->event, ctx->timeout); | |
556 | |
557 if (ngx_queue_empty(&r->addr_resend_queue)) { | |
558 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
559 } | |
560 | |
561 rn->expire = ngx_time() + r->resend_timeout; | |
562 | |
563 ngx_queue_insert_head(&r->addr_resend_queue, &rn->queue); | |
564 | |
565 rn->cnlen = 0; | |
566 rn->naddrs = 0; | |
567 rn->name = NULL; | |
568 rn->nlen = 0; | |
569 rn->valid = 0; | |
570 rn->waiting = ctx; | |
571 | |
572 /* unlock addr mutex */ | |
573 | |
574 ctx->state = NGX_AGAIN; | |
575 | |
576 return NGX_OK; | |
577 | |
578 failed: | |
579 | |
580 if (rn) { | |
581 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
582 | |
583 ngx_resolver_free(r, rn); | |
584 } | |
585 | |
586 /* unlock addr mutex */ | |
587 | |
588 /* lock alloc mutex */ | |
589 | |
590 if (ctx->event) { | |
591 ngx_resolver_free_locked(r, ctx->event); | |
592 } | |
593 | |
594 ngx_resolver_free_locked(r, ctx); | |
595 | |
596 /* unlock alloc mutex */ | |
597 | |
598 return NGX_ERROR; | |
599 } | |
600 | |
601 | |
602 void | |
603 ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx) | |
604 { | |
605 in_addr_t addr; | |
606 ngx_resolver_t *r; | |
607 ngx_resolver_ctx_t *w, **p; | |
608 ngx_resolver_node_t *rn; | |
609 | |
610 r = ctx->resolver; | |
611 | |
612 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
613 "resolve addr done: %i", ctx->state); | |
614 | |
615 if (ctx->event && ctx->event->timer_set) { | |
616 ngx_del_timer(ctx->event); | |
617 } | |
618 | |
619 /* lock addr mutex */ | |
620 | |
621 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
622 | |
623 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
624 | |
625 if (rn) { | |
626 p = &rn->waiting; | |
627 w = rn->waiting; | |
628 | |
629 while (w) { | |
630 if (w == ctx) { | |
631 *p = w->next; | |
632 | |
633 goto done; | |
634 } | |
635 | |
636 p = &w->next; | |
637 w = w->next; | |
638 } | |
639 } | |
640 | |
641 addr = ntohl(ctx->addr); | |
642 | |
643 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
644 "could not cancel %ud.%ud.%ud.%ud resolving", | |
645 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
646 (addr >> 8) & 0xff, addr & 0xff); | |
647 } | |
648 | |
649 done: | |
650 | |
651 ngx_resolver_expire(r, &r->addr_rbtree, &r->addr_expire_queue); | |
652 | |
653 /* unlock addr mutex */ | |
654 | |
655 ngx_resolver_free(r, ctx); | |
656 } | |
657 | |
658 | |
659 static void | |
660 ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
661 { | |
662 time_t now; | |
663 ngx_uint_t i; | |
664 ngx_queue_t *q; | |
665 ngx_resolver_node_t *rn; | |
666 | |
667 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire"); | |
668 | |
669 now = ngx_time(); | |
670 | |
671 for (i = 0; i < 2; i++) { | |
672 if (ngx_queue_empty(queue)) { | |
673 return; | |
674 } | |
675 | |
676 q = ngx_queue_last(queue); | |
677 | |
678 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
679 | |
680 if (now <= rn->expire) { | |
681 return; | |
682 } | |
683 | |
684 #if (NGX_DEBUG) | |
685 { | |
686 ngx_str_t s; | |
687 | |
688 s.len = rn->nlen; | |
689 s.data = rn->name; | |
690 | |
691 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
692 "resolver expire \"%V\"", &s); | |
693 } | |
694 #endif | |
695 | |
696 ngx_queue_remove(q); | |
697 | |
698 ngx_rbtree_delete(tree, &rn->node); | |
699 | |
700 ngx_resolver_free_node(r, rn); | |
701 } | |
702 } | |
703 | |
704 | |
705 static ngx_int_t | |
706 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
707 { | |
708 ssize_t n; | |
709 ngx_udp_connection_t *uc; | |
710 | |
711 uc = r->udp_connection; | |
712 | |
713 if (uc->connection == NULL) { | |
714 if (ngx_udp_connect(uc) != NGX_OK) { | |
715 return NGX_ERROR; | |
716 } | |
717 | |
718 uc->connection->data = r; | |
719 uc->connection->read->handler = ngx_resolver_read_response; | |
720 } | |
721 | |
722 n = ngx_send(uc->connection, rn->query, rn->qlen); | |
723 | |
724 if (n == -1) { | |
725 return NGX_ERROR; | |
726 } | |
727 | |
728 if ((size_t) n != (size_t) rn->qlen) { | |
729 ngx_log_error(NGX_LOG_CRIT, uc->log, 0, "send() incomplete"); | |
730 return NGX_ERROR; | |
731 } | |
732 | |
733 return NGX_OK; | |
734 } | |
735 | |
736 | |
737 static void | |
738 ngx_resolver_resend_handler(ngx_event_t *ev) | |
739 { | |
740 time_t timer, atimer, ntimer; | |
741 ngx_resolver_t *r; | |
742 | |
743 r = ev->data; | |
744 | |
745 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, | |
746 "resolver resend handler"); | |
747 | |
748 /* lock name mutex */ | |
749 | |
750 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue); | |
751 | |
752 /* unlock name mutex */ | |
753 | |
754 /* lock addr mutex */ | |
755 | |
756 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
|
757 |
1649 | 758 /* unlock addr mutex */ |
759 | |
760 if (ntimer == 0) { | |
761 timer = atimer; | |
762 | |
763 } else if (atimer == 0) { | |
764 timer = ntimer; | |
765 | |
766 } else { | |
767 timer = (atimer < ntimer) ? atimer : ntimer; | |
768 } | |
769 | |
770 if (timer) { | |
771 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000)); | |
772 } | |
773 } | |
774 | |
775 | |
776 static time_t | |
777 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
778 { | |
779 time_t now; | |
780 ngx_queue_t *q; | |
781 ngx_resolver_node_t *rn; | |
782 | |
783 now = ngx_time(); | |
784 | |
785 for ( ;; ) { | |
786 if (ngx_queue_empty(queue)) { | |
787 return 0; | |
788 } | |
789 | |
790 q = ngx_queue_last(queue); | |
791 | |
792 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
793 | |
794 if (now < rn->expire) { | |
795 return rn->expire - now; | |
796 } | |
797 | |
798 #if (NGX_DEBUG) | |
799 { | |
800 ngx_str_t s; | |
801 | |
802 s.len = rn->nlen; | |
803 s.data = rn->name; | |
804 | |
805 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
806 "resolver resend \"%V\" %p", &s, rn->waiting); | |
807 } | |
808 #endif | |
809 | |
810 ngx_queue_remove(q); | |
811 | |
812 if (rn->waiting) { | |
813 | |
814 if (ngx_resolver_send_query(r, rn) == NGX_OK) { | |
815 | |
816 rn->expire = now + r->resend_timeout; | |
817 | |
818 ngx_queue_insert_head(queue, &rn->queue); | |
819 | |
820 continue; | |
821 } | |
822 } | |
823 | |
824 ngx_rbtree_delete(tree, &rn->node); | |
825 | |
826 ngx_resolver_free_node(r, rn); | |
827 } | |
828 } | |
829 | |
830 | |
831 static void | |
832 ngx_resolver_read_response(ngx_event_t *rev) | |
833 { | |
834 ssize_t n; | |
835 ngx_connection_t *c; | |
836 u_char buf[NGX_RESOLVER_UDP_SIZE]; | |
837 | |
838 c = rev->data; | |
839 | |
840 do { | |
841 n = ngx_recv(c, buf, NGX_RESOLVER_UDP_SIZE); | |
842 | |
843 if (n == -1) { | |
844 return; | |
845 } | |
846 | |
847 ngx_resolver_process_response(c->data, buf, n); | |
848 | |
849 } while (rev->ready); | |
850 } | |
851 | |
852 | |
853 static void | |
854 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n) | |
855 { | |
856 char *err; | |
857 size_t len; | |
858 ngx_uint_t i, ident, flags, code, nqs, nan, qtype, qclass; | |
859 ngx_resolver_qs_t *qs; | |
860 ngx_resolver_query_t *query; | |
861 | |
862 if ((size_t) n < sizeof(ngx_resolver_query_t) + 1) { | |
863 goto short_response; | |
864 } | |
865 | |
866 query = (ngx_resolver_query_t *) buf; | |
867 | |
868 ident = (query->ident_hi << 8) + query->ident_lo; | |
869 flags = (query->flags_hi << 8) + query->flags_lo; | |
870 nqs = (query->nqs_hi << 8) + query->nqs_lo; | |
871 nan = (query->nan_hi << 8) + query->nan_lo; | |
872 | |
873 ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0, | |
874 "resolver DNS response %d fl:%04Xud %d/%d/%d/%d", | |
875 ident, flags, nqs, nan, | |
876 (query->nns_hi << 8) + query->nns_lo, | |
877 (query->nar_hi << 8) + query->nar_lo); | |
878 | |
879 if (!(flags & 0x8000)) { | |
880 ngx_log_error(r->log_level, r->log, 0, | |
881 "invalid DNS response %d fl:%04Xud", ident, flags); | |
882 return; | |
883 } | |
884 | |
885 code = flags & 0x7f; | |
886 | |
887 if (code == NGX_RESOLVE_FORMERR || code > NGX_RESOLVE_REFUSED) { | |
888 ngx_log_error(r->log_level, r->log, 0, | |
889 "DNS error (%d: %s), query id:%d", | |
890 code, ngx_resolver_strerror(code), ident); | |
891 return; | |
892 } | |
893 | |
894 if (nqs != 1) { | |
895 err = "invalid number of questions in DNS response"; | |
896 goto done; | |
897 } | |
898 | |
899 if (code == 0 && nan == 0) { | |
900 err = "no answers in DNS response"; | |
901 goto done; | |
902 } | |
903 | |
904 i = sizeof(ngx_resolver_query_t); | |
905 | |
906 while (i < (ngx_uint_t) n) { | |
907 if (buf[i] == '\0') { | |
908 goto found; | |
909 } | |
910 | |
911 len = buf[i]; | |
912 i += 1 + len; | |
913 } | |
914 | |
915 goto short_response; | |
916 | |
917 found: | |
918 | |
919 if (i++ == 0) { | |
920 err = "zero-length domain name in DNS response"; | |
921 goto done; | |
922 } | |
923 | |
924 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t)) | |
925 > (ngx_uint_t) n) | |
926 { | |
927 goto short_response; | |
928 } | |
929 | |
930 qs = (ngx_resolver_qs_t *) &buf[i]; | |
931 | |
932 qtype = (qs->type_hi << 8) + qs->type_lo; | |
933 qclass = (qs->class_hi << 8) + qs->class_lo; | |
934 | |
935 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
936 "resolver DNS response qt:%d cl:%d", qtype, qclass); | |
937 | |
938 if (qclass != 1) { | |
939 ngx_log_error(r->log_level, r->log, 0, | |
940 "unknown query class %d in DNS response", qclass); | |
941 return; | |
942 } | |
943 | |
944 switch (qtype) { | |
945 | |
946 case NGX_RESOLVE_A: | |
947 | |
948 ngx_resolver_process_a(r, buf, n, ident, code, nan, | |
949 i + sizeof(ngx_resolver_qs_t)); | |
950 | |
951 break; | |
952 | |
953 case NGX_RESOLVE_PTR: | |
954 | |
955 ngx_resolver_process_ptr(r, buf, n, ident, code); | |
956 | |
957 break; | |
958 | |
959 default: | |
960 ngx_log_error(r->log_level, r->log, 0, | |
961 "unknown query type %d in DNS response", qtype); | |
962 return; | |
963 } | |
964 | |
965 return; | |
966 | |
967 short_response: | |
968 | |
969 err = "short dns response"; | |
970 | |
971 done: | |
972 | |
973 ngx_log_error(r->log_level, r->log, 0, err); | |
974 | |
975 return; | |
976 } | |
977 | |
978 | |
979 static void | |
980 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last, | |
981 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans) | |
583 | 982 { |
1649 | 983 char *err; |
984 u_char *cname; | |
985 size_t len; | |
986 uint32_t hash; | |
987 in_addr_t addr, *addrs; | |
988 ngx_str_t name; | |
989 ngx_uint_t qtype, qident, naddrs, a, i, n, start; | |
990 ngx_resolver_an_t *an; | |
991 ngx_resolver_ctx_t *ctx, *next; | |
992 ngx_resolver_node_t *rn; | |
993 | |
994 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) { | |
995 return; | |
996 } | |
997 | |
998 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); | |
999 | |
1000 hash = ngx_crc32_short(name.data, name.len); | |
1001 | |
1002 /* lock name mutex */ | |
1003 | |
1004 rn = ngx_resolver_lookup_name(r, &name, hash); | |
1005 | |
1006 if (rn == NULL || rn->query == NULL) { | |
1007 ngx_log_error(r->log_level, r->log, 0, | |
1008 "unexpected response for %V", &name); | |
1009 goto failed; | |
1010 } | |
1011 | |
1012 qident = (rn->query[0] << 8) + rn->query[1]; | |
1013 | |
1014 if (ident != qident) { | |
1015 ngx_log_error(r->log_level, r->log, 0, | |
1016 "wrong ident %d response for %V, expect %d", | |
1017 ident, &name, qident); | |
1018 goto failed; | |
1019 } | |
1020 | |
1021 if (code) { | |
1022 next = rn->waiting; | |
1023 rn->waiting = NULL; | |
1024 | |
1025 ngx_queue_remove(&rn->queue); | |
1026 | |
1027 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
1028 | |
1029 ngx_resolver_free_node(r, rn); | |
1030 | |
1031 /* unlock name mutex */ | |
1032 | |
1033 while (next) { | |
1034 ctx = next; | |
1035 ctx->state = code; | |
1036 next = ctx->next; | |
1037 | |
1038 ctx->handler(ctx); | |
1039 } | |
1040 | |
1041 return; | |
1042 } | |
1043 | |
1044 i = ans; | |
1045 naddrs = 0; | |
1046 addr = 0; | |
1047 addrs = NULL; | |
1048 cname = NULL; | |
1049 qtype = 0; | |
1050 | |
1051 for (a = 0; a < nan; a++) { | |
1052 | |
1053 start = i; | |
1054 | |
1055 while (i < last) { | |
1056 | |
1057 if (buf[i] & 0xc0) { | |
1058 i += 2; | |
1059 goto found; | |
1060 } | |
1061 | |
1062 if (buf[i] == 0) { | |
1063 i++; | |
1064 goto test_length; | |
1065 } | |
1066 | |
1067 i += 1 + buf[i]; | |
1068 } | |
1069 | |
1070 goto short_response; | |
1071 | |
1072 test_length: | |
1073 | |
1074 if (i - start < 2) { | |
1075 err = "invalid name in dns response"; | |
1076 goto invalid; | |
1077 } | |
1078 | |
1079 found: | |
1080 | |
1081 if (i + sizeof(ngx_resolver_an_t) >= last) { | |
1082 goto short_response; | |
1083 } | |
1084 | |
1085 an = (ngx_resolver_an_t *) &buf[i]; | |
1086 | |
1087 qtype = (an->type_hi << 8) + an->type_lo; | |
1088 len = (an->len_hi << 8) + an->len_lo; | |
1089 | |
1090 if (qtype == NGX_RESOLVE_A) { | |
1091 | |
1092 i += sizeof(ngx_resolver_an_t); | |
1093 | |
1094 if (i + len > last) { | |
1095 goto short_response; | |
1096 } | |
1097 | |
1098 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
1099 + (buf[i + 2] << 8) + (buf[i + 3])); | |
1100 | |
1101 naddrs++; | |
1102 | |
1103 i += len; | |
1104 | |
1105 } else if (qtype == NGX_RESOLVE_CNAME) { | |
1106 cname = &buf[i] + sizeof(ngx_resolver_an_t); | |
1107 i += sizeof(ngx_resolver_an_t) + len; | |
1108 } | |
1109 } | |
1110 | |
1111 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1112 "resolver naddrs:%ui cname:%p", naddrs, cname); | |
1113 | |
1114 if (naddrs) { | |
1115 | |
1116 if (naddrs == 1) { | |
1117 rn->u.addr = addr; | |
1118 | |
1119 } else { | |
1120 | |
1121 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t)); | |
1122 if (addrs == NULL) { | |
1123 return; | |
1124 } | |
1125 | |
1126 n = 0; | |
1127 i = ans; | |
1128 | |
1129 for (a = 0; a < nan; a++) { | |
1130 | |
1131 for ( ;; ) { | |
1132 | |
1133 if (buf[i] & 0xc0) { | |
1134 i += 2; | |
1135 goto ok; | |
1136 } | |
1137 | |
1138 if (buf[i] == 0) { | |
1139 i++; | |
1140 goto ok; | |
1141 } | |
1142 | |
1143 i += 1 + buf[i]; | |
1144 } | |
1145 | |
1146 ok: | |
1147 | |
1148 an = (ngx_resolver_an_t *) &buf[i]; | |
1149 | |
1150 qtype = (an->type_hi << 8) + an->type_lo; | |
1151 len = (an->len_hi << 8) + an->len_lo; | |
1152 | |
1153 i += sizeof(ngx_resolver_an_t); | |
1154 | |
1155 if (qtype == NGX_RESOLVE_A) { | |
1156 | |
1157 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
1158 + (buf[i + 2] << 8) + (buf[i + 3])); | |
1159 | |
1160 if (n == naddrs) { | |
1161 break; | |
1162 } | |
1163 } | |
1164 | |
1165 i += len; | |
1166 } | |
1167 | |
1168 rn->u.addrs = addrs; | |
1169 | |
1170 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
1171 naddrs * sizeof(in_addr_t)); | |
1172 if (addrs == NULL) { | |
1173 return; | |
1174 } | |
1175 } | |
1176 | |
1177 rn->naddrs = (u_short) naddrs; | |
1178 | |
1179 ngx_queue_remove(&rn->queue); | |
1180 | |
1181 rn->valid = ngx_time() + r->valid; | |
1182 rn->expire = ngx_time() + r->expire; | |
1183 | |
1184 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
1185 | |
1186 next = rn->waiting; | |
1187 rn->waiting = NULL; | |
1188 | |
1189 /* unlock name mutex */ | |
1190 | |
1191 while (next) { | |
1192 ctx = next; | |
1193 ctx->state = NGX_OK; | |
1194 ctx->naddrs = naddrs; | |
1195 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
1196 ctx->addr = addr; | |
1197 next = ctx->next; | |
1198 | |
1199 ctx->handler(ctx); | |
1200 } | |
1201 | |
1202 if (naddrs) { | |
1203 ngx_resolver_free(r, addrs); | |
1204 } | |
1205 | |
1206 return; | |
1207 | |
1208 } else if (cname) { | |
1209 | |
1210 /* CNAME only */ | |
1211 | |
1212 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) { | |
1213 return; | |
1214 } | |
1215 | |
1216 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1217 "resolver cname:\"%V\"", &name); | |
1218 | |
1219 rn->cnlen = (u_short) name.len; | |
1220 rn->u.cname = name.data; | |
1221 rn->valid = ngx_time() + r->valid; | |
1222 rn->expire = ngx_time() + r->expire; | |
1223 | |
1224 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
1225 | |
1226 ctx = rn->waiting; | |
1227 rn->waiting = NULL; | |
1228 | |
1229 if (ctx) { | |
1230 ctx->name = name; | |
1231 | |
1232 (void) ngx_resolve_name_locked(r, ctx); | |
1233 } | |
1234 | |
1235 return; | |
1236 } | |
1237 | |
1238 ngx_log_error(r->log_level, r->log, 0, | |
1239 "no A or CNAME types in DNS responses, unknown query type: %d", | |
1240 qtype); | |
1241 return; | |
1242 | |
1243 short_response: | |
1244 | |
1245 err = "short dns response"; | |
1246 | |
1247 invalid: | |
1248 | |
1249 /* unlock name mutex */ | |
1250 | |
1251 ngx_log_error(r->log_level, r->log, 0, err); | |
1252 | |
1253 return; | |
1254 | |
1255 failed: | |
1256 | |
1257 /* unlock name mutex */ | |
1258 | |
1259 return; | |
1260 } | |
1261 | |
1262 | |
1263 static void | |
1264 ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, | |
1265 ngx_uint_t ident, ngx_uint_t code) | |
1266 { | |
1267 char *err; | |
1268 size_t len; | |
1269 in_addr_t addr; | |
1270 ngx_int_t digit; | |
1271 ngx_str_t name; | |
1272 ngx_uint_t i, mask, qtype, qclass, qident; | |
1273 ngx_resolver_an_t *an; | |
1274 ngx_resolver_ctx_t *ctx, *next; | |
1275 ngx_resolver_node_t *rn; | |
1276 | |
1277 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) { | |
1278 goto invalid_in_addr_arpa; | |
1279 } | |
1280 | |
1281 addr = 0; | |
1282 i = 12; | |
1283 | |
1284 for (mask = 0; mask < 32; mask += 8) { | |
1285 len = buf[i++]; | |
1286 | |
1287 digit = ngx_atoi(&buf[i], len); | |
1288 if (digit == NGX_ERROR || digit > 255) { | |
1289 goto invalid_in_addr_arpa; | |
1290 } | |
1291 | |
1292 addr += digit << mask; | |
1293 i += len; | |
1294 } | |
1295 | |
1296 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) { | |
1297 goto invalid_in_addr_arpa; | |
1298 } | |
1299 | |
1300 /* lock addr mutex */ | |
1301 | |
1302 rn = ngx_resolver_lookup_addr(r, addr); | |
1303 | |
1304 if (rn == NULL || rn->query == NULL) { | |
1305 ngx_log_error(r->log_level, r->log, 0, | |
1306 "unexpected response for %ud.%ud.%ud.%ud", | |
1307 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
1308 (addr >> 8) & 0xff, addr & 0xff); | |
1309 goto failed; | |
1310 } | |
1311 | |
1312 qident = (rn->query[0] << 8) + rn->query[1]; | |
1313 | |
1314 if (ident != qident) { | |
1315 ngx_log_error(r->log_level, r->log, 0, | |
1316 "wrong ident %d response for %ud.%ud.%ud.%ud, expect %d", | |
1317 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
1318 (addr >> 8) & 0xff, addr & 0xff, qident); | |
1319 goto failed; | |
1320 } | |
1321 | |
1322 if (code) { | |
1323 next = rn->waiting; | |
1324 rn->waiting = NULL; | |
1325 | |
1326 ngx_queue_remove(&rn->queue); | |
1327 | |
1328 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
1329 | |
1330 ngx_resolver_free_node(r, rn); | |
1331 | |
1332 /* unlock addr mutex */ | |
1333 | |
1334 while (next) { | |
1335 ctx = next; | |
1336 ctx->state = code; | |
1337 next = ctx->next; | |
1338 | |
1339 ctx->handler(ctx); | |
1340 } | |
1341 | |
1342 return; | |
1343 } | |
1344 | |
1345 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t); | |
1346 | |
1347 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) { | |
1348 goto short_response; | |
1349 } | |
1350 | |
1351 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */ | |
1352 | |
1353 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) { | |
1354 err = "invalid in-addr.arpa name in DNS response"; | |
1355 goto invalid; | |
1356 } | |
1357 | |
1358 an = (ngx_resolver_an_t *) &buf[i + 2]; | |
1359 | |
1360 qtype = (an->type_hi << 8) + an->type_lo; | |
1361 qclass = (an->class_hi << 8) + an->class_lo; | |
1362 len = (an->len_hi << 8) + an->len_lo; | |
1363 | |
1364 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1365 "resolver qt:%d cl:%d len:%uz", qtype, qclass, len); | |
1366 | |
1367 i += 2 + sizeof(ngx_resolver_an_t); | |
1368 | |
1369 if (i + len > (ngx_uint_t) n) { | |
1370 goto short_response; | |
1371 } | |
1372 | |
1373 len -= 2; | |
1374 | |
1375 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) { | |
1376 return; | |
1377 } | |
1378 | |
1379 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name); | |
1380 | |
1381 if (len != (size_t) rn->nlen || ngx_strncmp(name.data, rn->name, len) != 0) | |
1382 { | |
1383 ngx_resolver_free(r, rn->name); | |
1384 rn->name = name.data; | |
1385 | |
1386 name.data = ngx_resolver_dup(r, rn->name, len); | |
1387 if (name.data == NULL) { | |
1388 goto failed; | |
1389 } | |
1390 } | |
1391 | |
1392 ngx_queue_remove(&rn->queue); | |
1393 | |
1394 rn->valid = ngx_time() + r->valid; | |
1395 rn->expire = ngx_time() + r->expire; | |
1396 | |
1397 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
1398 | |
1399 next = rn->waiting; | |
1400 rn->waiting = NULL; | |
1401 | |
1402 /* unlock addr mutex */ | |
1403 | |
1404 while (next) { | |
1405 ctx = next; | |
1406 ctx->state = NGX_OK; | |
1407 ctx->name = name; | |
1408 next = ctx->next; | |
1409 | |
1410 ctx->handler(ctx); | |
1411 } | |
1412 | |
1413 ngx_resolver_free(r, name.data); | |
1414 | |
1415 return; | |
1416 | |
1417 invalid_in_addr_arpa: | |
1418 | |
1419 ngx_log_error(r->log_level, r->log, 0, | |
1420 "invalid in-addr.arpa name in DNS response"); | |
1421 return; | |
1422 | |
1423 short_response: | |
1424 | |
1425 err = "short DNS response"; | |
1426 | |
1427 invalid: | |
1428 | |
1429 /* unlock addr mutex */ | |
1430 | |
1431 ngx_log_error(r->log_level, r->log, 0, err); | |
1432 | |
1433 return; | |
1434 | |
1435 failed: | |
1436 | |
1437 /* unlock addr mutex */ | |
1438 | |
1439 return; | |
1440 } | |
1441 | |
1442 | |
1443 static ngx_resolver_node_t * | |
1444 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) | |
1445 { | |
1446 ngx_int_t rc; | |
1447 size_t len; | |
1448 ngx_rbtree_node_t *node, *sentinel; | |
1449 ngx_resolver_node_t *rn; | |
1450 | |
1451 node = r->name_rbtree.root; | |
1452 sentinel = r->name_rbtree.sentinel; | |
1453 | |
1454 while (node != sentinel) { | |
1455 | |
1456 if (hash < node->key) { | |
1457 node = node->left; | |
1458 continue; | |
1459 } | |
1460 | |
1461 if (hash > node->key) { | |
1462 node = node->right; | |
1463 continue; | |
1464 } | |
1465 | |
1466 /* hash == node->key */ | |
1467 | |
1468 do { | |
1469 rn = (ngx_resolver_node_t *) node; | |
1470 | |
1471 len = (name->len > (size_t) rn->nlen) ? rn->nlen : name->len; | |
1472 | |
1473 rc = ngx_strncmp(name->data, rn->name, len); | |
1474 | |
1475 if (rc == 0) { | |
1476 return rn; | |
1477 } | |
1478 | |
1479 node = (rc < 0) ? node->left : node->right; | |
1480 | |
1481 } while (node != sentinel && hash == node->key); | |
1482 | |
1483 break; | |
1484 } | |
1485 | |
1486 /* not found */ | |
1487 | |
1488 return NULL; | |
1489 } | |
1490 | |
1491 | |
1492 static ngx_resolver_node_t * | |
1493 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr) | |
1494 { | |
1495 ngx_rbtree_node_t *node, *sentinel; | |
1496 | |
1497 node = r->addr_rbtree.root; | |
1498 sentinel = r->addr_rbtree.sentinel; | |
1499 | |
1500 while (node != sentinel) { | |
1501 | |
1502 if (addr < node->key) { | |
1503 node = node->left; | |
1504 continue; | |
1505 } | |
1506 | |
1507 if (addr > node->key) { | |
1508 node = node->right; | |
1509 continue; | |
1510 } | |
1511 | |
1512 /* addr == node->key */ | |
1513 | |
1514 return (ngx_resolver_node_t *) node; | |
1515 } | |
1516 | |
1517 /* not found */ | |
1518 | |
1519 return NULL; | |
1520 } | |
1521 | |
1522 | |
1523 static void | |
1524 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
1525 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
1526 { | |
1527 size_t len; | |
1528 ngx_rbtree_node_t **p; | |
1529 ngx_resolver_node_t *rn, *rn_temp; | |
1530 | |
1531 for ( ;; ) { | |
1532 | |
1533 if (node->key < temp->key) { | |
1534 | |
1535 p = &temp->left; | |
1536 | |
1537 } else if (node->key > temp->key) { | |
1538 | |
1539 p = &temp->right; | |
1540 | |
1541 } else { /* node->key == temp->key */ | |
1542 | |
1543 rn = (ngx_resolver_node_t *) node; | |
1544 rn_temp = (ngx_resolver_node_t *) temp; | |
1545 | |
1546 len = (rn->nlen > rn_temp->nlen) ? rn_temp->nlen : rn->nlen; | |
1547 | |
1548 p = (ngx_strncmp(rn->name, rn_temp->name, len) < 0) | |
1549 ? &temp->left : &temp->right; | |
1550 } | |
1551 | |
1552 if (*p == sentinel) { | |
1553 break; | |
1554 } | |
1555 | |
1556 temp = *p; | |
1557 } | |
1558 | |
1559 *p = node; | |
1560 node->parent = temp; | |
1561 node->left = sentinel; | |
1562 node->right = sentinel; | |
1563 ngx_rbt_red(node); | |
1564 } | |
1565 | |
1566 | |
1567 static ngx_int_t | |
1568 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
1569 { | |
1570 u_char *p, *s; | |
1571 size_t len; | |
1572 ngx_uint_t ident; | |
1573 ngx_resolver_qs_t *qs; | |
1574 ngx_resolver_query_t *query; | |
1575 | |
1576 len = sizeof(ngx_resolver_query_t) | |
1577 + 1 + ctx->name.len + 1 + sizeof(ngx_resolver_qs_t); | |
1578 | |
1579 p = ngx_resolver_calloc(ctx->resolver, len); | |
1580 if (p == NULL) { | |
1581 return NGX_ERROR; | |
1582 } | |
1583 | |
1584 rn->qlen = (u_short) len; | |
1585 rn->query = p; | |
1586 | |
1587 query = (ngx_resolver_query_t *) p; | |
1588 | |
1589 ident = ngx_random(); | |
1590 | |
1591 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0, | |
1592 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff); | |
1593 | |
1594 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
1595 query->ident_lo = (u_char) (ident & 0xff); | |
1596 | |
1597 /* recursion query */ | |
1598 query->flags_hi = 1; query->flags_lo = 0; | |
1599 | |
1600 /* one question */ | |
1601 query->nqs_hi = 0; query->nqs_lo = 1; | |
1602 query->nan_hi = 0; query->nan_lo = 0; | |
1603 query->nns_hi = 0; query->nns_lo = 0; | |
1604 query->nar_hi = 0; query->nar_lo = 0; | |
1605 | |
1606 p += sizeof(ngx_resolver_query_t) + 1 + ctx->name.len + 1; | |
1607 | |
1608 qs = (ngx_resolver_qs_t *) p; | |
1609 | |
1610 /* query type */ | |
1611 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type; | |
1612 | |
1613 /* IP query class */ | |
1614 qs->class_hi = 0; qs->class_lo = 1; | |
1615 | |
1616 /* convert "www.example.com" to "\3www\7example\3com\0" */ | |
1617 | |
1618 len = 0; | |
1619 p--; | |
1620 *p-- = '\0'; | |
1621 | |
1622 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) { | |
1623 if (*s != '.') { | |
1624 *p = *s; | |
1625 len++; | |
1626 | |
1627 } else { | |
1628 *p = (u_char) len; | |
1629 len = 0; | |
1630 } | |
1631 | |
1632 p--; | |
1633 } | |
1634 | |
1635 *p = (u_char) len; | |
1636 | |
1637 return NGX_OK; | |
1638 } | |
1639 | |
1640 | |
1641 /* AF_INET only */ | |
1642 | |
1643 static ngx_int_t | |
1644 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
1645 { | |
1646 u_char *p, *d; | |
1647 size_t len; | |
1648 ngx_int_t n; | |
1649 ngx_uint_t ident; | |
1650 ngx_resolver_query_t *query; | |
1651 | |
1652 len = sizeof(ngx_resolver_query_t) | |
1653 + sizeof(".255.255.255.255.in-addr.arpa.") - 1 | |
1654 + sizeof(ngx_resolver_qs_t); | |
1655 | |
1656 p = ngx_resolver_calloc(ctx->resolver, len); | |
1657 if (p == NULL) { | |
1658 return NGX_ERROR; | |
1659 } | |
1660 | |
1661 rn->query = p; | |
1662 query = (ngx_resolver_query_t *) p; | |
1663 | |
1664 ident = ngx_random(); | |
1665 | |
1666 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
1667 query->ident_lo = (u_char) (ident & 0xff); | |
1668 | |
1669 /* recursion query */ | |
1670 query->flags_hi = 1; query->flags_lo = 0; | |
1671 | |
1672 /* one question */ | |
1673 query->nqs_hi = 0; query->nqs_lo = 1; | |
1674 query->nan_hi = 0; query->nan_lo = 0; | |
1675 query->nns_hi = 0; query->nns_lo = 0; | |
1676 query->nar_hi = 0; query->nar_lo = 0; | |
1677 | |
1678 p += sizeof(ngx_resolver_query_t); | |
1679 | |
1680 for (n = 0; n < 32; n += 8){ | |
1681 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff); | |
1682 *p = (u_char) (d - &p[1]); | |
1683 p = d; | |
1684 } | |
1685 | |
1686 /* query type "PTR", IP query class */ | |
1687 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18); | |
1688 | |
1689 rn->qlen = (u_short) | |
1690 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t) | |
1691 - rn->query); | |
1692 | |
1693 return NGX_OK; | |
1694 } | |
1695 | |
1696 | |
1697 static ngx_int_t | |
1698 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src, | |
1699 u_char *last) | |
1700 { | |
1701 char *err; | |
1702 u_char *p, *dst; | |
1703 ssize_t len; | |
1704 ngx_uint_t i, n; | |
1705 | |
1706 p = src; | |
1707 len = -1; | |
1708 | |
1709 /* | |
1710 * compression pointers allow to create endless loop, so we set limit; | |
1711 * 128 pointers should be enough to store 255-byte name | |
1712 */ | |
1713 | |
1714 for (i = 0; i < 128; i++) { | |
1715 n = *p++; | |
1716 | |
1717 if (n == 0) { | |
1718 goto done; | |
1719 } | |
1720 | |
1721 if (n & 0xc0) { | |
1722 n = (n & 0x3f << 8) + *p; | |
1723 p = &buf[n]; | |
1724 | |
1725 } else { | |
1726 len += 1 + n; | |
1727 p = &p[n]; | |
1728 } | |
1729 | |
1730 if (p >= last) { | |
1731 err = "name is out of response"; | |
1732 goto invalid; | |
1733 } | |
1734 } | |
1735 | |
1736 err = "compression pointers loop"; | |
1737 | |
1738 invalid: | |
1739 | |
1740 ngx_log_error(r->log_level, r->log, 0, err); | |
1741 | |
1742 return NGX_ERROR; | |
1743 | |
1744 done: | |
1745 | |
1746 if (name == NULL) { | |
583 | 1747 return NGX_OK; |
1748 } | |
1749 | |
1649 | 1750 dst = ngx_resolver_alloc(r, len); |
1751 if (dst == NULL) { | |
1752 return NGX_ERROR; | |
1753 } | |
1754 | |
1755 name->data = dst; | |
1756 | |
1757 n = *src++; | |
1758 | |
1759 for ( ;; ) { | |
1760 if (n != 0xc0) { | |
1761 ngx_memcpy(dst, src, n); | |
1762 dst += n; | |
1763 src += n; | |
1764 | |
1765 n = *src++; | |
1766 | |
1767 if (n != 0) { | |
1768 *dst++ = '.'; | |
1769 } | |
1770 | |
1771 } else { | |
1772 n = (n & 0x3f << 8) + *src; | |
1773 src = &buf[n]; | |
1774 | |
1775 n = *src++; | |
1776 } | |
1777 | |
1778 if (n == 0) { | |
1779 name->len = dst - name->data; | |
1780 return NGX_OK; | |
1781 } | |
1782 } | |
1783 } | |
1784 | |
1785 | |
1786 static void | |
1787 ngx_resolver_timeout_handler(ngx_event_t *ev) | |
1788 { | |
1789 ngx_resolver_ctx_t *ctx; | |
1790 | |
1791 ctx = ev->data; | |
1792 | |
1793 ctx->state = NGX_RESOLVE_TIMEDOUT; | |
1794 | |
1795 ctx->handler(ctx); | |
1796 } | |
1797 | |
1798 | |
1799 static void | |
1800 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
1801 { | |
1802 /* lock alloc mutex */ | |
1803 | |
1804 if (rn->query) { | |
1805 ngx_resolver_free_locked(r, rn->query); | |
1806 } | |
1807 | |
1808 if (rn->name) { | |
1809 ngx_resolver_free_locked(r, rn->name); | |
1810 } | |
1811 | |
1812 if (rn->cnlen) { | |
1813 ngx_resolver_free_locked(r, rn->u.cname); | |
1814 } | |
1815 | |
1816 if (rn->naddrs > 1) { | |
1817 ngx_resolver_free_locked(r, rn->u.addrs); | |
1818 } | |
1819 | |
1820 ngx_resolver_free_locked(r, rn); | |
1821 | |
1822 /* unlock alloc mutex */ | |
1823 } | |
1824 | |
1825 | |
1826 static void * | |
1827 ngx_resolver_alloc(ngx_resolver_t *r, size_t size) | |
1828 { | |
1829 u_char *p; | |
1830 | |
1831 /* lock alloc mutex */ | |
1832 | |
1833 p = ngx_alloc(size, r->log); | |
1834 | |
1835 /* unlock alloc mutex */ | |
1836 | |
1837 return p; | |
1838 } | |
1839 | |
1840 | |
1841 void * | |
1842 ngx_resolver_calloc(ngx_resolver_t *r, size_t size) | |
1843 { | |
1844 u_char *p; | |
1845 | |
1846 p = ngx_resolver_alloc(r, size); | |
1847 | |
1848 if (p) { | |
1849 ngx_memzero(p, size); | |
1850 } | |
1851 | |
1852 return p; | |
1853 } | |
1854 | |
1855 | |
1856 static void | |
1857 ngx_resolver_free(ngx_resolver_t *r, void *p) | |
1858 { | |
1859 /* lock alloc mutex */ | |
1860 | |
1861 ngx_free(p); | |
1862 | |
1863 /* unlock alloc mutex */ | |
1864 } | |
1865 | |
1866 | |
1867 static void | |
1868 ngx_resolver_free_locked(ngx_resolver_t *r, void *p) | |
1869 { | |
1870 ngx_free(p); | |
1871 } | |
1872 | |
1873 | |
1874 static void * | |
1875 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size) | |
1876 { | |
1877 void *dst; | |
1878 | |
1879 dst = ngx_resolver_alloc(r, size); | |
1880 | |
1881 if (dst == NULL) { | |
1882 return dst; | |
1883 } | |
1884 | |
1885 ngx_memcpy(dst, src, size); | |
1886 | |
1887 return dst; | |
1888 } | |
1889 | |
1890 | |
1891 char * | |
1892 ngx_resolver_strerror(ngx_int_t err) | |
1893 { | |
1894 static char *errors[] = { | |
1895 "Format error", /* FORMERR */ | |
1896 "Server failure", /* SERVFAIL */ | |
1897 "Host not found", /* NXDOMAIN */ | |
1898 "Unimplemented", /* NOTIMP */ | |
1899 "Operation refused" /* REFUSED */ | |
1900 }; | |
1901 | |
1902 if (err > 0 && err < 6) { | |
1903 return errors[err - 1]; | |
1904 } | |
1905 | |
1906 if (err == NGX_RESOLVE_TIMEDOUT) { | |
1907 return "Operation timed out"; | |
1908 } | |
1909 | |
1910 return "Unknown error"; | |
1911 } | |
1912 | |
1913 | |
1914 ngx_int_t | |
1915 ngx_udp_connect(ngx_udp_connection_t *uc) | |
1916 { | |
1917 int rc; | |
1918 ngx_int_t event; | |
1919 ngx_event_t *rev, *wev; | |
1920 ngx_socket_t s; | |
1921 ngx_connection_t *c; | |
1922 | |
583 | 1923 s = ngx_socket(AF_INET, SOCK_DGRAM, 0); |
1924 | |
1649 | 1925 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, uc->log, 0, "UDP socket %d", s); |
583 | 1926 |
1927 if (s == -1) { | |
1649 | 1928 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
583 | 1929 ngx_socket_n " failed"); |
1930 return NGX_ERROR; | |
1931 } | |
1932 | |
1649 | 1933 c = ngx_get_connection(s, uc->log); |
583 | 1934 |
1935 if (c == NULL) { | |
1936 if (ngx_close_socket(s) == -1) { | |
1649 | 1937 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
583 | 1938 ngx_close_socket_n "failed"); |
1939 } | |
1940 | |
1941 return NGX_ERROR; | |
1942 } | |
1943 | |
1649 | 1944 if (ngx_nonblocking(s) == -1) { |
1945 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
1946 ngx_nonblocking_n " failed"); | |
1947 | |
1948 ngx_free_connection(c); | |
1949 | |
1950 if (ngx_close_socket(s) == -1) { | |
1951 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
1952 ngx_close_socket_n " failed"); | |
1953 } | |
1954 | |
1955 return NGX_ERROR; | |
1956 } | |
1957 | |
583 | 1958 rev = c->read; |
1959 wev = c->write; | |
1960 | |
1649 | 1961 rev->log = uc->log; |
1962 wev->log = uc->log; | |
1963 | |
1964 uc->connection = c; | |
583 | 1965 |
1966 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); | |
1967 | |
1968 #if (NGX_THREADS) | |
1649 | 1969 |
1970 /* TODO: lock event when call completion handler */ | |
1971 | |
1972 rev->lock = &c->lock; | |
1973 wev->lock = &c->lock; | |
583 | 1974 rev->own_lock = &c->lock; |
1975 wev->own_lock = &c->lock; | |
1649 | 1976 |
583 | 1977 #endif |
1978 | |
1649 | 1979 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, uc->log, 0, |
1980 "connect to %V, fd:%d #%d", &uc->server, s, c->number); | |
1981 | |
1982 rc = connect(s, uc->sockaddr, uc->socklen); | |
1983 | |
1984 /* TODO: aio, iocp */ | |
583 | 1985 |
1986 if (rc == -1) { | |
1649 | 1987 ngx_log_error(NGX_LOG_CRIT, uc->log, ngx_socket_errno, |
1988 "connect() to %V failed", &uc->server); | |
583 | 1989 |
1990 return NGX_ERROR; | |
1991 } | |
1992 | |
1649 | 1993 /* UDP sockets are always ready to write */ |
1994 wev->ready = 1; | |
1995 | |
1996 if (ngx_add_event) { | |
1997 | |
1998 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ? | |
1999 /* kqueue, epoll */ NGX_CLEAR_EVENT: | |
2000 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT; | |
2001 /* eventport event type has no meaning: oneshot only */ | |
2002 | |
2003 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { | |
2004 return NGX_ERROR; | |
2005 } | |
2006 | |
2007 } else { | |
2008 /* rtsig */ | |
2009 | |
583 | 2010 if (ngx_add_conn(c) == NGX_ERROR) { |
2011 return NGX_ERROR; | |
2012 } | |
2013 } | |
2014 | |
2015 return NGX_OK; | |
2016 } |