Mercurial > hg > nginx
annotate src/core/ngx_resolver.c @ 2484:cf3cd450049c
store name pointer in variable allocated on stack
as resolver ctx may be already deallocated at this point
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Thu, 29 Jan 2009 14:35:23 +0000 |
parents | 29494780d978 |
children | 8de5dc3e7001 |
rev | line source |
---|---|
583 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4 */ | |
5 | |
6 | |
7 #include <ngx_config.h> | |
8 #include <ngx_core.h> | |
9 #include <ngx_event.h> | |
10 | |
11 | |
1649 | 12 #define NGX_RESOLVER_UDP_SIZE 4096 |
13 | |
14 | |
583 | 15 typedef struct { |
1649 | 16 u_char ident_hi; |
17 u_char ident_lo; | |
18 u_char flags_hi; | |
19 u_char flags_lo; | |
20 u_char nqs_hi; | |
21 u_char nqs_lo; | |
22 u_char nan_hi; | |
23 u_char nan_lo; | |
24 u_char nns_hi; | |
25 u_char nns_lo; | |
26 u_char nar_hi; | |
27 u_char nar_lo; | |
28 } ngx_resolver_query_t; | |
29 | |
30 | |
31 typedef struct { | |
32 u_char type_hi; | |
33 u_char type_lo; | |
34 u_char class_hi; | |
35 u_char class_lo; | |
36 } ngx_resolver_qs_t; | |
37 | |
38 | |
39 typedef struct { | |
40 u_char type_hi; | |
41 u_char type_lo; | |
42 u_char class_hi; | |
43 u_char class_lo; | |
44 u_char ttl[4]; | |
45 u_char len_hi; | |
46 u_char len_lo; | |
47 } ngx_resolver_an_t; | |
48 | |
49 | |
50 ngx_int_t ngx_udp_connect(ngx_udp_connection_t *uc); | |
51 | |
52 | |
1906 | 53 static void ngx_resolver_cleanup(void *data); |
54 static void ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree); | |
1649 | 55 static ngx_int_t ngx_resolve_name_locked(ngx_resolver_t *r, |
56 ngx_resolver_ctx_t *ctx); | |
57 static void ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
58 ngx_queue_t *queue); | |
59 static ngx_int_t ngx_resolver_send_query(ngx_resolver_t *r, | |
60 ngx_resolver_node_t *rn); | |
61 static ngx_int_t ngx_resolver_create_name_query(ngx_resolver_node_t *rn, | |
62 ngx_resolver_ctx_t *ctx); | |
63 static ngx_int_t ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, | |
64 ngx_resolver_ctx_t *ctx); | |
65 static void ngx_resolver_resend_handler(ngx_event_t *ev); | |
66 static time_t ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
67 ngx_queue_t *queue); | |
68 static void ngx_resolver_read_response(ngx_event_t *rev); | |
69 static void ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, | |
70 size_t n); | |
71 static void ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t n, | |
1742
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72 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans); |
1649 | 73 static void ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, |
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74 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan); |
1649 | 75 static ngx_resolver_node_t *ngx_resolver_lookup_name(ngx_resolver_t *r, |
76 ngx_str_t *name, uint32_t hash); | |
77 static ngx_resolver_node_t *ngx_resolver_lookup_addr(ngx_resolver_t *r, | |
78 in_addr_t addr); | |
79 static void ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
80 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel); | |
81 static ngx_int_t ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, | |
82 u_char *buf, u_char *src, u_char *last); | |
83 static void ngx_resolver_timeout_handler(ngx_event_t *ev); | |
84 static void ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn); | |
85 static void *ngx_resolver_alloc(ngx_resolver_t *r, size_t size); | |
1903 | 86 static void *ngx_resolver_calloc(ngx_resolver_t *r, size_t size); |
1649 | 87 static void ngx_resolver_free(ngx_resolver_t *r, void *p); |
88 static void ngx_resolver_free_locked(ngx_resolver_t *r, void *p); | |
89 static void *ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size); | |
90 | |
91 | |
92 /* STUB: ngx_peer_addr_t * */ | |
93 | |
94 ngx_resolver_t * | |
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95 ngx_resolver_create(ngx_conf_t *cf, ngx_peer_addr_t *addr) |
1649 | 96 { |
97 ngx_resolver_t *r; | |
1906 | 98 ngx_pool_cleanup_t *cln; |
1649 | 99 ngx_udp_connection_t *uc; |
100 | |
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101 cln = ngx_pool_cleanup_add(cf->pool, 0); |
1906 | 102 if (cln == NULL) { |
103 return NULL; | |
104 } | |
105 | |
106 cln->handler = ngx_resolver_cleanup; | |
107 | |
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108 r = ngx_calloc(sizeof(ngx_resolver_t), cf->log); |
1649 | 109 if (r == NULL) { |
110 return NULL; | |
111 } | |
112 | |
1906 | 113 cln->data = r; |
114 | |
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115 r->event = ngx_calloc(sizeof(ngx_event_t), cf->log); |
1649 | 116 if (r->event == NULL) { |
117 return NULL; | |
118 } | |
119 | |
1687 | 120 ngx_rbtree_init(&r->name_rbtree, &r->name_sentinel, |
121 ngx_resolver_rbtree_insert_value); | |
122 | |
123 ngx_rbtree_init(&r->addr_rbtree, &r->addr_sentinel, | |
124 ngx_rbtree_insert_value); | |
1649 | 125 |
1685 | 126 ngx_queue_init(&r->name_resend_queue); |
127 ngx_queue_init(&r->addr_resend_queue); | |
128 | |
129 ngx_queue_init(&r->name_expire_queue); | |
130 ngx_queue_init(&r->addr_expire_queue); | |
1649 | 131 |
132 r->event->handler = ngx_resolver_resend_handler; | |
133 r->event->data = r; | |
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134 r->event->log = cf->cycle->new_log; |
1649 | 135 r->ident = -1; |
136 | |
137 r->resend_timeout = 5; | |
138 r->expire = 30; | |
139 r->valid = 300; | |
140 | |
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141 r->log = cf->cycle->new_log; |
1649 | 142 r->log_level = NGX_LOG_ALERT; |
143 | |
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144 if (addr) { |
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145 uc = ngx_calloc(sizeof(ngx_udp_connection_t), cf->log); |
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146 if (uc == NULL) { |
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147 return NULL; |
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148 } |
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149 |
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150 r->udp_connection = uc; |
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151 |
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152 uc->sockaddr = addr->sockaddr; |
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153 uc->socklen = addr->socklen; |
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154 uc->server = addr->name; |
1914 | 155 uc->log = cf->cycle->new_log; |
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156 } |
1649 | 157 |
158 return r; | |
159 } | |
160 | |
161 | |
1906 | 162 static void |
163 ngx_resolver_cleanup(void *data) | |
164 { | |
165 ngx_resolver_t *r = data; | |
166 | |
167 if (r) { | |
168 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, | |
169 "cleanup resolver"); | |
170 | |
171 ngx_resolver_cleanup_tree(r, &r->name_rbtree); | |
172 | |
173 ngx_resolver_cleanup_tree(r, &r->addr_rbtree); | |
174 | |
175 if (r->event) { | |
176 ngx_free(r->event); | |
177 } | |
178 | |
179 if (r->udp_connection) { | |
180 if (r->udp_connection->connection) { | |
181 ngx_close_connection(r->udp_connection->connection); | |
182 } | |
183 | |
184 ngx_free(r->udp_connection); | |
185 } | |
186 | |
187 ngx_free(r); | |
188 } | |
189 } | |
190 | |
191 | |
192 static void | |
193 ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree) | |
194 { | |
195 ngx_resolver_ctx_t *ctx, *next; | |
196 ngx_resolver_node_t *rn; | |
197 | |
198 while (tree->root != tree->sentinel) { | |
199 | |
200 rn = (ngx_resolver_node_t *) ngx_rbtree_min(tree->root, tree->sentinel); | |
201 | |
202 ngx_queue_remove(&rn->queue); | |
203 | |
204 for (ctx = rn->waiting; ctx; ctx = next) { | |
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205 next = ctx->next; |
1906 | 206 |
207 if (ctx->event) { | |
208 ngx_resolver_free(r, ctx->event); | |
209 } | |
210 | |
211 ngx_resolver_free(r, ctx); | |
212 } | |
213 | |
214 ngx_rbtree_delete(tree, &rn->node); | |
215 | |
216 ngx_resolver_free_node(r, rn); | |
217 } | |
218 } | |
219 | |
220 | |
1649 | 221 ngx_resolver_ctx_t * |
222 ngx_resolve_start(ngx_resolver_t *r, ngx_resolver_ctx_t *temp) | |
223 { | |
224 in_addr_t addr; | |
225 ngx_resolver_ctx_t *ctx; | |
226 | |
227 if (temp) { | |
228 addr = ngx_inet_addr(temp->name.data, temp->name.len); | |
229 | |
230 if (addr != INADDR_NONE) { | |
231 temp->resolver = r; | |
232 temp->state = NGX_OK; | |
233 temp->naddrs = 1; | |
234 temp->addrs = &temp->addr; | |
235 temp->addr = addr; | |
236 temp->quick = 1; | |
237 | |
238 return temp; | |
239 } | |
240 } | |
241 | |
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242 if (r->udp_connection == NULL) { |
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243 return NGX_NO_RESOLVER; |
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244 } |
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245 |
1649 | 246 ctx = ngx_resolver_calloc(r, sizeof(ngx_resolver_ctx_t)); |
247 | |
248 if (ctx) { | |
249 ctx->resolver = r; | |
250 } | |
251 | |
252 return ctx; | |
253 } | |
254 | |
255 | |
256 ngx_int_t | |
257 ngx_resolve_name(ngx_resolver_ctx_t *ctx) | |
258 { | |
259 ngx_int_t rc; | |
260 ngx_resolver_t *r; | |
261 | |
262 r = ctx->resolver; | |
263 | |
264 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
265 "resolve: \"%V\"", &ctx->name); | |
266 | |
267 if (ctx->quick) { | |
268 ctx->handler(ctx); | |
269 return NGX_OK; | |
270 } | |
271 | |
272 /* lock name mutex */ | |
273 | |
274 rc = ngx_resolve_name_locked(r, ctx); | |
275 | |
276 if (rc == NGX_OK) { | |
277 return NGX_OK; | |
278 } | |
279 | |
280 /* unlock name mutex */ | |
281 | |
282 if (rc == NGX_AGAIN) { | |
283 return NGX_OK; | |
284 } | |
285 | |
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286 /* NGX_ERROR */ |
1649 | 287 |
288 if (ctx->event) { | |
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289 ngx_resolver_free(r, ctx->event); |
1649 | 290 } |
291 | |
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292 ngx_resolver_free(r, ctx); |
1649 | 293 |
294 return NGX_ERROR; | |
295 } | |
296 | |
297 | |
298 void | |
299 ngx_resolve_name_done(ngx_resolver_ctx_t *ctx) | |
300 { | |
301 uint32_t hash; | |
302 ngx_resolver_t *r; | |
303 ngx_resolver_ctx_t *w, **p; | |
304 ngx_resolver_node_t *rn; | |
305 | |
306 r = ctx->resolver; | |
307 | |
308 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
309 "resolve name done: %i", ctx->state); | |
310 | |
311 if (ctx->quick) { | |
312 return; | |
313 } | |
314 | |
315 if (ctx->event && ctx->event->timer_set) { | |
316 ngx_del_timer(ctx->event); | |
317 } | |
318 | |
319 /* lock name mutex */ | |
320 | |
321 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
322 | |
323 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
324 | |
325 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
326 | |
327 if (rn) { | |
328 p = &rn->waiting; | |
329 w = rn->waiting; | |
330 | |
331 while (w) { | |
332 if (w == ctx) { | |
333 *p = w->next; | |
334 | |
335 goto done; | |
336 } | |
337 | |
338 p = &w->next; | |
339 w = w->next; | |
340 } | |
341 } | |
342 | |
343 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
344 "could not cancel %V resolving", &ctx->name); | |
345 } | |
346 | |
347 done: | |
348 | |
349 ngx_resolver_expire(r, &r->name_rbtree, &r->name_expire_queue); | |
350 | |
351 /* unlock name mutex */ | |
352 | |
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353 /* lock alloc mutex */ |
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354 |
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355 if (ctx->event) { |
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356 ngx_resolver_free_locked(r, ctx->event); |
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357 } |
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358 |
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359 ngx_resolver_free_locked(r, ctx); |
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360 |
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361 /* unlock alloc mutex */ |
1649 | 362 } |
363 | |
364 | |
365 /* NGX_RESOLVE_A only */ | |
366 | |
367 static ngx_int_t | |
368 ngx_resolve_name_locked(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx) | |
369 { | |
370 uint32_t hash; | |
371 in_addr_t addr, *addrs; | |
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372 ngx_int_t rc; |
1649 | 373 ngx_uint_t naddrs; |
374 ngx_resolver_ctx_t *next; | |
375 ngx_resolver_node_t *rn; | |
376 | |
377 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
378 | |
379 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
380 | |
381 if (rn) { | |
382 | |
383 if (rn->valid >= ngx_time()) { | |
384 | |
385 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
386 | |
387 ngx_queue_remove(&rn->queue); | |
388 | |
389 rn->expire = ngx_time() + r->expire; | |
390 | |
391 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
392 | |
393 naddrs = rn->naddrs; | |
394 | |
395 if (naddrs) { | |
396 | |
397 /* NGX_RESOLVE_A answer */ | |
398 | |
399 if (naddrs != 1) { | |
400 addr = 0; | |
401 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
402 naddrs * sizeof(in_addr_t)); | |
403 if (addrs == NULL) { | |
404 return NGX_ERROR; | |
405 } | |
406 | |
407 } else { | |
408 addr = rn->u.addr; | |
409 addrs = NULL; | |
410 } | |
411 | |
412 ctx->next = rn->waiting; | |
413 rn->waiting = NULL; | |
414 | |
415 /* unlock name mutex */ | |
416 | |
417 do { | |
418 ctx->state = NGX_OK; | |
419 ctx->naddrs = naddrs; | |
420 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
421 ctx->addr = addr; | |
422 next = ctx->next; | |
423 | |
424 ctx->handler(ctx); | |
425 | |
426 ctx = next; | |
427 } while (ctx); | |
428 | |
429 if (addrs) { | |
430 ngx_resolver_free(r, addrs); | |
431 } | |
432 | |
433 return NGX_OK; | |
434 } | |
435 | |
436 /* NGX_RESOLVE_CNAME */ | |
437 | |
1969 | 438 if (ctx->recursion++ < NGX_RESOLVER_MAX_RECURSION) { |
439 | |
440 ctx->name.len = rn->cnlen; | |
441 ctx->name.data = rn->u.cname; | |
442 | |
443 return ngx_resolve_name_locked(r, ctx); | |
444 } | |
445 | |
446 ctx->next = rn->waiting; | |
447 rn->waiting = NULL; | |
448 | |
449 /* unlock name mutex */ | |
450 | |
451 do { | |
452 ctx->state = NGX_RESOLVE_NXDOMAIN; | |
453 next = ctx->next; | |
454 | |
455 ctx->handler(ctx); | |
456 | |
457 ctx = next; | |
458 } while (ctx); | |
459 | |
460 return NGX_OK; | |
1649 | 461 } |
462 | |
463 if (rn->waiting) { | |
464 | |
465 ctx->next = rn->waiting; | |
466 rn->waiting = ctx; | |
467 | |
468 return NGX_AGAIN; | |
469 } | |
470 | |
471 ngx_queue_remove(&rn->queue); | |
472 | |
473 /* lock alloc mutex */ | |
474 | |
475 ngx_resolver_free_locked(r, rn->query); | |
1960
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diff
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|
476 rn->query = NULL; |
1649 | 477 |
478 if (rn->cnlen) { | |
479 ngx_resolver_free_locked(r, rn->u.cname); | |
480 } | |
481 | |
482 if (rn->naddrs > 1) { | |
483 ngx_resolver_free_locked(r, rn->u.addrs); | |
484 } | |
485 | |
486 /* unlock alloc mutex */ | |
487 | |
488 } else { | |
489 | |
490 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
491 if (rn == NULL) { | |
492 return NGX_ERROR; | |
493 } | |
494 | |
495 rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len); | |
496 if (rn->name == NULL) { | |
497 ngx_resolver_free(r, rn); | |
498 return NGX_ERROR; | |
499 } | |
500 | |
501 rn->node.key = hash; | |
502 rn->nlen = (u_short) ctx->name.len; | |
1960
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fix memory leak on resolver query send failure
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diff
changeset
|
503 rn->query = NULL; |
1649 | 504 |
505 ngx_rbtree_insert(&r->name_rbtree, &rn->node); | |
506 } | |
507 | |
1961
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diff
changeset
|
508 rc = ngx_resolver_create_name_query(rn, ctx); |
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return NXDOMAIN for ".." in host name
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diff
changeset
|
509 |
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
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diff
changeset
|
510 if (rc == NGX_ERROR) { |
1649 | 511 goto failed; |
512 } | |
513 | |
1961
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diff
changeset
|
514 if (rc == NGX_DECLINED) { |
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diff
changeset
|
515 ngx_rbtree_delete(&r->name_rbtree, &rn->node); |
99b9feacccb4
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diff
changeset
|
516 |
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diff
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|
517 ngx_resolver_free(r, rn->query); |
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parents:
1960
diff
changeset
|
518 ngx_resolver_free(r, rn->name); |
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return NXDOMAIN for ".." in host name
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1960
diff
changeset
|
519 ngx_resolver_free(r, rn); |
99b9feacccb4
return NXDOMAIN for ".." in host name
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1960
diff
changeset
|
520 |
99b9feacccb4
return NXDOMAIN for ".." in host name
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diff
changeset
|
521 ctx->state = NGX_RESOLVE_NXDOMAIN; |
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diff
changeset
|
522 ctx->handler(ctx); |
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diff
changeset
|
523 |
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return NXDOMAIN for ".." in host name
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diff
changeset
|
524 return NGX_OK; |
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return NXDOMAIN for ".." in host name
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diff
changeset
|
525 } |
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return NXDOMAIN for ".." in host name
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1960
diff
changeset
|
526 |
1649 | 527 if (ngx_resolver_send_query(r, rn) != NGX_OK) { |
528 goto failed; | |
529 } | |
530 | |
531 if (ctx->event == NULL) { | |
532 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
533 if (ctx->event == NULL) { | |
534 goto failed; | |
535 } | |
536 | |
537 ctx->event->handler = ngx_resolver_timeout_handler; | |
538 ctx->event->data = ctx; | |
539 ctx->event->log = r->log; | |
540 ctx->ident = -1; | |
541 | |
542 ngx_add_timer(ctx->event, ctx->timeout); | |
543 } | |
544 | |
545 if (ngx_queue_empty(&r->name_resend_queue)) { | |
546 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
547 } | |
548 | |
549 rn->expire = ngx_time() + r->resend_timeout; | |
550 | |
551 ngx_queue_insert_head(&r->name_resend_queue, &rn->queue); | |
552 | |
553 rn->cnlen = 0; | |
554 rn->naddrs = 0; | |
555 rn->valid = 0; | |
556 rn->waiting = ctx; | |
557 | |
558 ctx->state = NGX_AGAIN; | |
559 | |
560 return NGX_AGAIN; | |
561 | |
562 failed: | |
563 | |
564 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
565 | |
1960
1609b3c3d604
fix memory leak on resolver query send failure
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parents:
1914
diff
changeset
|
566 if (rn->query) { |
1609b3c3d604
fix memory leak on resolver query send failure
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parents:
1914
diff
changeset
|
567 ngx_resolver_free(r, rn->query); |
1609b3c3d604
fix memory leak on resolver query send failure
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diff
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|
568 } |
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diff
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|
569 |
1649 | 570 ngx_resolver_free(r, rn->name); |
571 | |
572 ngx_resolver_free(r, rn); | |
573 | |
574 return NGX_ERROR; | |
575 } | |
583 | 576 |
577 | |
578 ngx_int_t | |
1649 | 579 ngx_resolve_addr(ngx_resolver_ctx_t *ctx) |
580 { | |
2484
cf3cd450049c
store name pointer in variable allocated on stack
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parents:
2483
diff
changeset
|
581 u_char *name; |
1649 | 582 ngx_resolver_t *r; |
583 ngx_resolver_node_t *rn; | |
584 | |
585 r = ctx->resolver; | |
586 | |
587 ctx->addr = ntohl(ctx->addr); | |
588 | |
589 /* lock addr mutex */ | |
590 | |
591 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
592 | |
593 if (rn) { | |
594 | |
595 if (rn->valid >= ngx_time()) { | |
596 | |
597 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
598 | |
599 ngx_queue_remove(&rn->queue); | |
600 | |
601 rn->expire = ngx_time() + r->expire; | |
602 | |
603 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
604 | |
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
605 name = ngx_resolver_dup(r, rn->name, rn->nlen); |
cf3cd450049c
store name pointer in variable allocated on stack
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parents:
2483
diff
changeset
|
606 if (name == NULL) { |
1649 | 607 goto failed; |
608 } | |
609 | |
2484
cf3cd450049c
store name pointer in variable allocated on stack
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parents:
2483
diff
changeset
|
610 ctx->name.len = rn->nlen; |
cf3cd450049c
store name pointer in variable allocated on stack
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parents:
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diff
changeset
|
611 ctx->name.data = name; |
cf3cd450049c
store name pointer in variable allocated on stack
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diff
changeset
|
612 |
1649 | 613 /* unlock addr mutex */ |
614 | |
615 ctx->state = NGX_OK; | |
616 | |
617 ctx->handler(ctx); | |
618 | |
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
619 ngx_resolver_free(r, name); |
1649 | 620 |
621 return NGX_OK; | |
622 } | |
623 | |
624 if (rn->waiting) { | |
625 | |
626 ctx->next = rn->waiting; | |
627 rn->waiting = ctx; | |
628 | |
629 return NGX_AGAIN; | |
630 } | |
631 | |
632 ngx_queue_remove(&rn->queue); | |
633 | |
634 ngx_resolver_free(r, rn->query); | |
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
635 rn->query = NULL; |
1649 | 636 |
637 } else { | |
638 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
639 if (rn == NULL) { | |
640 goto failed; | |
641 } | |
642 | |
643 rn->node.key = ctx->addr; | |
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
644 rn->query = NULL; |
1649 | 645 |
646 ngx_rbtree_insert(&r->addr_rbtree, &rn->node); | |
647 } | |
648 | |
649 if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) { | |
650 goto failed; | |
651 } | |
652 | |
653 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
654 goto failed; | |
655 } | |
656 | |
657 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
658 if (ctx->event == NULL) { | |
659 goto failed; | |
660 } | |
661 | |
662 ctx->event->handler = ngx_resolver_timeout_handler; | |
663 ctx->event->data = ctx; | |
664 ctx->event->log = r->log; | |
665 ctx->ident = -1; | |
666 | |
667 ngx_add_timer(ctx->event, ctx->timeout); | |
668 | |
669 if (ngx_queue_empty(&r->addr_resend_queue)) { | |
670 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
671 } | |
672 | |
673 rn->expire = ngx_time() + r->resend_timeout; | |
674 | |
675 ngx_queue_insert_head(&r->addr_resend_queue, &rn->queue); | |
676 | |
677 rn->cnlen = 0; | |
678 rn->naddrs = 0; | |
679 rn->name = NULL; | |
680 rn->nlen = 0; | |
681 rn->valid = 0; | |
682 rn->waiting = ctx; | |
683 | |
684 /* unlock addr mutex */ | |
685 | |
686 ctx->state = NGX_AGAIN; | |
687 | |
688 return NGX_OK; | |
689 | |
690 failed: | |
691 | |
692 if (rn) { | |
693 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
694 | |
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
695 if (rn->query) { |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
696 ngx_resolver_free(r, rn->query); |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
697 } |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
698 |
1649 | 699 ngx_resolver_free(r, rn); |
700 } | |
701 | |
702 /* unlock addr mutex */ | |
703 | |
704 if (ctx->event) { | |
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
705 ngx_resolver_free(r, ctx->event); |
1649 | 706 } |
707 | |
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
708 ngx_resolver_free(r, ctx); |
1649 | 709 |
710 return NGX_ERROR; | |
711 } | |
712 | |
713 | |
714 void | |
715 ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx) | |
716 { | |
717 in_addr_t addr; | |
718 ngx_resolver_t *r; | |
719 ngx_resolver_ctx_t *w, **p; | |
720 ngx_resolver_node_t *rn; | |
721 | |
722 r = ctx->resolver; | |
723 | |
724 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
725 "resolve addr done: %i", ctx->state); | |
726 | |
727 if (ctx->event && ctx->event->timer_set) { | |
728 ngx_del_timer(ctx->event); | |
729 } | |
730 | |
731 /* lock addr mutex */ | |
732 | |
733 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
734 | |
735 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
736 | |
737 if (rn) { | |
738 p = &rn->waiting; | |
739 w = rn->waiting; | |
740 | |
741 while (w) { | |
742 if (w == ctx) { | |
743 *p = w->next; | |
744 | |
745 goto done; | |
746 } | |
747 | |
748 p = &w->next; | |
749 w = w->next; | |
750 } | |
751 } | |
752 | |
753 addr = ntohl(ctx->addr); | |
754 | |
755 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
756 "could not cancel %ud.%ud.%ud.%ud resolving", | |
757 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
758 (addr >> 8) & 0xff, addr & 0xff); | |
759 } | |
760 | |
761 done: | |
762 | |
763 ngx_resolver_expire(r, &r->addr_rbtree, &r->addr_expire_queue); | |
764 | |
765 /* unlock addr mutex */ | |
766 | |
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
767 /* lock alloc mutex */ |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
768 |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
769 if (ctx->event) { |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
770 ngx_resolver_free_locked(r, ctx->event); |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
771 } |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
772 |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
773 ngx_resolver_free_locked(r, ctx); |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
774 |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
775 /* unlock alloc mutex */ |
1649 | 776 } |
777 | |
778 | |
779 static void | |
780 ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
781 { | |
782 time_t now; | |
783 ngx_uint_t i; | |
784 ngx_queue_t *q; | |
785 ngx_resolver_node_t *rn; | |
786 | |
787 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire"); | |
788 | |
789 now = ngx_time(); | |
790 | |
791 for (i = 0; i < 2; i++) { | |
792 if (ngx_queue_empty(queue)) { | |
793 return; | |
794 } | |
795 | |
796 q = ngx_queue_last(queue); | |
797 | |
798 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
799 | |
800 if (now <= rn->expire) { | |
801 return; | |
802 } | |
803 | |
1774 | 804 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, |
805 "resolver expire \"%*s\"", (size_t) rn->nlen, rn->name); | |
1649 | 806 |
807 ngx_queue_remove(q); | |
808 | |
809 ngx_rbtree_delete(tree, &rn->node); | |
810 | |
811 ngx_resolver_free_node(r, rn); | |
812 } | |
813 } | |
814 | |
815 | |
816 static ngx_int_t | |
817 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
818 { | |
819 ssize_t n; | |
820 ngx_udp_connection_t *uc; | |
821 | |
822 uc = r->udp_connection; | |
823 | |
824 if (uc->connection == NULL) { | |
825 if (ngx_udp_connect(uc) != NGX_OK) { | |
826 return NGX_ERROR; | |
827 } | |
828 | |
829 uc->connection->data = r; | |
830 uc->connection->read->handler = ngx_resolver_read_response; | |
1906 | 831 uc->connection->read->resolver = 1; |
1649 | 832 } |
833 | |
834 n = ngx_send(uc->connection, rn->query, rn->qlen); | |
835 | |
836 if (n == -1) { | |
837 return NGX_ERROR; | |
838 } | |
839 | |
840 if ((size_t) n != (size_t) rn->qlen) { | |
841 ngx_log_error(NGX_LOG_CRIT, uc->log, 0, "send() incomplete"); | |
842 return NGX_ERROR; | |
843 } | |
844 | |
845 return NGX_OK; | |
846 } | |
847 | |
848 | |
849 static void | |
850 ngx_resolver_resend_handler(ngx_event_t *ev) | |
851 { | |
852 time_t timer, atimer, ntimer; | |
853 ngx_resolver_t *r; | |
854 | |
855 r = ev->data; | |
856 | |
857 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, | |
858 "resolver resend handler"); | |
859 | |
860 /* lock name mutex */ | |
861 | |
862 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue); | |
863 | |
864 /* unlock name mutex */ | |
865 | |
866 /* lock addr mutex */ | |
867 | |
868 atimer = ngx_resolver_resend(r, &r->addr_rbtree, &r->addr_resend_queue); | |
1679
ca317d9b5c09
style fix: remove trailing spaces
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parents:
1649
diff
changeset
|
869 |
1649 | 870 /* unlock addr mutex */ |
871 | |
872 if (ntimer == 0) { | |
873 timer = atimer; | |
874 | |
875 } else if (atimer == 0) { | |
876 timer = ntimer; | |
877 | |
878 } else { | |
879 timer = (atimer < ntimer) ? atimer : ntimer; | |
880 } | |
881 | |
882 if (timer) { | |
883 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000)); | |
884 } | |
885 } | |
886 | |
887 | |
888 static time_t | |
889 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
890 { | |
891 time_t now; | |
892 ngx_queue_t *q; | |
893 ngx_resolver_node_t *rn; | |
894 | |
895 now = ngx_time(); | |
896 | |
897 for ( ;; ) { | |
898 if (ngx_queue_empty(queue)) { | |
899 return 0; | |
900 } | |
901 | |
902 q = ngx_queue_last(queue); | |
903 | |
904 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
905 | |
906 if (now < rn->expire) { | |
907 return rn->expire - now; | |
908 } | |
909 | |
1774 | 910 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, |
911 "resolver resend \"%*s\" %p", | |
912 (size_t) rn->nlen, rn->name, rn->waiting); | |
1649 | 913 |
914 ngx_queue_remove(q); | |
915 | |
916 if (rn->waiting) { | |
917 | |
918 if (ngx_resolver_send_query(r, rn) == NGX_OK) { | |
919 | |
920 rn->expire = now + r->resend_timeout; | |
921 | |
922 ngx_queue_insert_head(queue, &rn->queue); | |
923 } | |
1879
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924 |
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925 continue; |
1649 | 926 } |
927 | |
928 ngx_rbtree_delete(tree, &rn->node); | |
929 | |
930 ngx_resolver_free_node(r, rn); | |
931 } | |
932 } | |
933 | |
934 | |
935 static void | |
936 ngx_resolver_read_response(ngx_event_t *rev) | |
937 { | |
938 ssize_t n; | |
939 ngx_connection_t *c; | |
940 u_char buf[NGX_RESOLVER_UDP_SIZE]; | |
941 | |
942 c = rev->data; | |
943 | |
944 do { | |
1689 | 945 n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE); |
946 | |
947 if (n < 0) { | |
1649 | 948 return; |
949 } | |
950 | |
951 ngx_resolver_process_response(c->data, buf, n); | |
952 | |
953 } while (rev->ready); | |
954 } | |
955 | |
956 | |
957 static void | |
958 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n) | |
959 { | |
960 char *err; | |
961 size_t len; | |
2282
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962 ngx_uint_t i, times, ident, qident, flags, code, nqs, nan, |
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963 qtype, qclass; |
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964 ngx_queue_t *q; |
1649 | 965 ngx_resolver_qs_t *qs; |
2282
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966 ngx_resolver_node_t *rn; |
1649 | 967 ngx_resolver_query_t *query; |
968 | |
2281
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969 if ((size_t) n < sizeof(ngx_resolver_query_t)) { |
1649 | 970 goto short_response; |
971 } | |
972 | |
973 query = (ngx_resolver_query_t *) buf; | |
974 | |
975 ident = (query->ident_hi << 8) + query->ident_lo; | |
976 flags = (query->flags_hi << 8) + query->flags_lo; | |
977 nqs = (query->nqs_hi << 8) + query->nqs_lo; | |
978 nan = (query->nan_hi << 8) + query->nan_lo; | |
979 | |
980 ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1967
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981 "resolver DNS response %ui fl:%04Xui %ui/%ui/%ui/%ui", |
1649 | 982 ident, flags, nqs, nan, |
983 (query->nns_hi << 8) + query->nns_lo, | |
984 (query->nar_hi << 8) + query->nar_lo); | |
985 | |
986 if (!(flags & 0x8000)) { | |
987 ngx_log_error(r->log_level, r->log, 0, | |
1967
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988 "invalid DNS response %ui fl:%04Xui", ident, flags); |
1649 | 989 return; |
990 } | |
991 | |
992 code = flags & 0x7f; | |
993 | |
2282
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994 if (code == NGX_RESOLVE_FORMERR) { |
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995 |
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996 times = 0; |
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997 |
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998 for (q = ngx_queue_head(&r->name_resend_queue); |
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999 q != ngx_queue_sentinel(&r->name_resend_queue) || times++ < 100; |
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1000 q = ngx_queue_next(q)) |
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1001 { |
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1002 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); |
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1003 qident = (rn->query[0] << 8) + rn->query[1]; |
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1004 |
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1005 if (qident == ident) { |
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1006 ngx_log_error(r->log_level, r->log, 0, |
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1007 "DNS error (%ui: %s), query id:%ui, name:\"%*s\"", |
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1008 code, ngx_resolver_strerror(code), ident, |
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1009 rn->nlen, rn->name); |
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1010 return; |
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1011 } |
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1012 } |
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1013 |
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1014 goto dns_error; |
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1015 } |
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1016 |
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1017 if (code > NGX_RESOLVE_REFUSED) { |
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1018 goto dns_error; |
1649 | 1019 } |
1020 | |
1021 if (nqs != 1) { | |
1022 err = "invalid number of questions in DNS response"; | |
1023 goto done; | |
1024 } | |
1025 | |
1026 i = sizeof(ngx_resolver_query_t); | |
1027 | |
1028 while (i < (ngx_uint_t) n) { | |
1029 if (buf[i] == '\0') { | |
1030 goto found; | |
1031 } | |
1032 | |
1033 len = buf[i]; | |
1034 i += 1 + len; | |
1035 } | |
1036 | |
1037 goto short_response; | |
1038 | |
1039 found: | |
1040 | |
1041 if (i++ == 0) { | |
1042 err = "zero-length domain name in DNS response"; | |
1043 goto done; | |
1044 } | |
1045 | |
1046 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t)) | |
1047 > (ngx_uint_t) n) | |
1048 { | |
1049 goto short_response; | |
1050 } | |
1051 | |
1052 qs = (ngx_resolver_qs_t *) &buf[i]; | |
1053 | |
1054 qtype = (qs->type_hi << 8) + qs->type_lo; | |
1055 qclass = (qs->class_hi << 8) + qs->class_lo; | |
1056 | |
1057 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1967
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1058 "resolver DNS response qt:%ui cl:%ui", qtype, qclass); |
1649 | 1059 |
1060 if (qclass != 1) { | |
1061 ngx_log_error(r->log_level, r->log, 0, | |
1967
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1062 "unknown query class %ui in DNS response", qclass); |
1649 | 1063 return; |
1064 } | |
1065 | |
1066 switch (qtype) { | |
1067 | |
1068 case NGX_RESOLVE_A: | |
1069 | |
1070 ngx_resolver_process_a(r, buf, n, ident, code, nan, | |
1742
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diff
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|
1071 i + sizeof(ngx_resolver_qs_t)); |
1649 | 1072 |
1073 break; | |
1074 | |
1075 case NGX_RESOLVE_PTR: | |
1076 | |
1742
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diff
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|
1077 ngx_resolver_process_ptr(r, buf, n, ident, code, nan); |
1649 | 1078 |
1079 break; | |
1080 | |
1081 default: | |
1082 ngx_log_error(r->log_level, r->log, 0, | |
1967
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1966
diff
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|
1083 "unknown query type %ui in DNS response", qtype); |
1649 | 1084 return; |
1085 } | |
1086 | |
1087 return; | |
1088 | |
1089 short_response: | |
1090 | |
1091 err = "short dns response"; | |
1092 | |
1093 done: | |
1094 | |
1095 ngx_log_error(r->log_level, r->log, 0, err); | |
1096 | |
1097 return; | |
2282
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|
1098 |
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|
1099 dns_error: |
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1100 |
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1101 ngx_log_error(r->log_level, r->log, 0, |
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1102 "DNS error (%ui: %s), query id:%ui", |
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1103 code, ngx_resolver_strerror(code), ident); |
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1104 return; |
1649 | 1105 } |
1106 | |
1107 | |
1108 static void | |
1109 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last, | |
1110 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans) | |
583 | 1111 { |
1649 | 1112 char *err; |
1113 u_char *cname; | |
1114 size_t len; | |
1115 uint32_t hash; | |
1116 in_addr_t addr, *addrs; | |
1117 ngx_str_t name; | |
1118 ngx_uint_t qtype, qident, naddrs, a, i, n, start; | |
1119 ngx_resolver_an_t *an; | |
1120 ngx_resolver_ctx_t *ctx, *next; | |
1121 ngx_resolver_node_t *rn; | |
1122 | |
1123 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) { | |
1124 return; | |
1125 } | |
1126 | |
1127 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); | |
1128 | |
1129 hash = ngx_crc32_short(name.data, name.len); | |
1130 | |
1131 /* lock name mutex */ | |
1132 | |
1133 rn = ngx_resolver_lookup_name(r, &name, hash); | |
1134 | |
1135 if (rn == NULL || rn->query == NULL) { | |
1136 ngx_log_error(r->log_level, r->log, 0, | |
1137 "unexpected response for %V", &name); | |
1138 goto failed; | |
1139 } | |
1140 | |
1141 qident = (rn->query[0] << 8) + rn->query[1]; | |
1142 | |
1143 if (ident != qident) { | |
1144 ngx_log_error(r->log_level, r->log, 0, | |
1967
4a4b15c9c474
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Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1145 "wrong ident %ui response for %V, expect %ui", |
1649 | 1146 ident, &name, qident); |
1147 goto failed; | |
1148 } | |
1149 | |
1742
268b81386fe4
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parents:
1741
diff
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|
1150 if (code == 0 && nan == 0) { |
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diff
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|
1151 code = 3; /* NXDOMAIN */ |
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parents:
1741
diff
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|
1152 } |
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diff
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|
1153 |
1649 | 1154 if (code) { |
1155 next = rn->waiting; | |
1156 rn->waiting = NULL; | |
1157 | |
1158 ngx_queue_remove(&rn->queue); | |
1159 | |
1160 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
1161 | |
1162 ngx_resolver_free_node(r, rn); | |
1163 | |
1164 /* unlock name mutex */ | |
1165 | |
1166 while (next) { | |
1167 ctx = next; | |
1168 ctx->state = code; | |
1169 next = ctx->next; | |
1170 | |
1171 ctx->handler(ctx); | |
1172 } | |
1173 | |
1174 return; | |
1175 } | |
1176 | |
1177 i = ans; | |
1178 naddrs = 0; | |
1179 addr = 0; | |
1180 addrs = NULL; | |
1181 cname = NULL; | |
1182 qtype = 0; | |
1183 | |
1184 for (a = 0; a < nan; a++) { | |
1185 | |
1186 start = i; | |
1187 | |
1188 while (i < last) { | |
1189 | |
1190 if (buf[i] & 0xc0) { | |
1191 i += 2; | |
1192 goto found; | |
1193 } | |
1194 | |
1195 if (buf[i] == 0) { | |
1196 i++; | |
1197 goto test_length; | |
1198 } | |
1199 | |
1200 i += 1 + buf[i]; | |
1201 } | |
1202 | |
1203 goto short_response; | |
1204 | |
1205 test_length: | |
1206 | |
1207 if (i - start < 2) { | |
1208 err = "invalid name in dns response"; | |
1209 goto invalid; | |
1210 } | |
1211 | |
1212 found: | |
1213 | |
1214 if (i + sizeof(ngx_resolver_an_t) >= last) { | |
1215 goto short_response; | |
1216 } | |
1217 | |
1218 an = (ngx_resolver_an_t *) &buf[i]; | |
1219 | |
1220 qtype = (an->type_hi << 8) + an->type_lo; | |
1221 len = (an->len_hi << 8) + an->len_lo; | |
1222 | |
1223 if (qtype == NGX_RESOLVE_A) { | |
1224 | |
1225 i += sizeof(ngx_resolver_an_t); | |
1226 | |
1227 if (i + len > last) { | |
1228 goto short_response; | |
1229 } | |
1230 | |
1231 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
1232 + (buf[i + 2] << 8) + (buf[i + 3])); | |
1233 | |
1234 naddrs++; | |
1235 | |
1236 i += len; | |
1237 | |
1238 } else if (qtype == NGX_RESOLVE_CNAME) { | |
1239 cname = &buf[i] + sizeof(ngx_resolver_an_t); | |
1240 i += sizeof(ngx_resolver_an_t) + len; | |
1965 | 1241 |
1242 } else if (qtype == NGX_RESOLVE_DNAME) { | |
1243 i += sizeof(ngx_resolver_an_t) + len; | |
1966 | 1244 |
1245 } else { | |
1246 ngx_log_error(r->log_level, r->log, 0, | |
1247 "unexpected qtype %ui", qtype); | |
1649 | 1248 } |
1249 } | |
1250 | |
1251 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1252 "resolver naddrs:%ui cname:%p", naddrs, cname); | |
1253 | |
1254 if (naddrs) { | |
1255 | |
1256 if (naddrs == 1) { | |
1257 rn->u.addr = addr; | |
1258 | |
1259 } else { | |
1260 | |
1261 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t)); | |
1262 if (addrs == NULL) { | |
1263 return; | |
1264 } | |
1265 | |
1266 n = 0; | |
1267 i = ans; | |
1268 | |
1269 for (a = 0; a < nan; a++) { | |
1270 | |
1271 for ( ;; ) { | |
1272 | |
1273 if (buf[i] & 0xc0) { | |
1274 i += 2; | |
1275 goto ok; | |
1276 } | |
1277 | |
1278 if (buf[i] == 0) { | |
1279 i++; | |
1280 goto ok; | |
1281 } | |
1282 | |
1283 i += 1 + buf[i]; | |
1284 } | |
1285 | |
1286 ok: | |
1287 | |
1288 an = (ngx_resolver_an_t *) &buf[i]; | |
1289 | |
1290 qtype = (an->type_hi << 8) + an->type_lo; | |
1291 len = (an->len_hi << 8) + an->len_lo; | |
1292 | |
1293 i += sizeof(ngx_resolver_an_t); | |
1294 | |
1295 if (qtype == NGX_RESOLVE_A) { | |
1296 | |
1297 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
1298 + (buf[i + 2] << 8) + (buf[i + 3])); | |
1299 | |
1300 if (n == naddrs) { | |
1301 break; | |
1302 } | |
1303 } | |
1304 | |
1305 i += len; | |
1306 } | |
1307 | |
1308 rn->u.addrs = addrs; | |
1309 | |
1310 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
1311 naddrs * sizeof(in_addr_t)); | |
1312 if (addrs == NULL) { | |
1313 return; | |
1314 } | |
1315 } | |
1316 | |
1317 rn->naddrs = (u_short) naddrs; | |
1318 | |
1319 ngx_queue_remove(&rn->queue); | |
1320 | |
1321 rn->valid = ngx_time() + r->valid; | |
1322 rn->expire = ngx_time() + r->expire; | |
1323 | |
1324 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
1325 | |
1326 next = rn->waiting; | |
1327 rn->waiting = NULL; | |
1328 | |
1329 /* unlock name mutex */ | |
1330 | |
1331 while (next) { | |
1332 ctx = next; | |
1333 ctx->state = NGX_OK; | |
1334 ctx->naddrs = naddrs; | |
1335 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
1336 ctx->addr = addr; | |
1337 next = ctx->next; | |
1338 | |
1339 ctx->handler(ctx); | |
1340 } | |
1341 | |
2483
29494780d978
free addrs only it has been allocated before: non single address
Igor Sysoev <igor@sysoev.ru>
parents:
2482
diff
changeset
|
1342 if (naddrs > 1) { |
1649 | 1343 ngx_resolver_free(r, addrs); |
1344 } | |
1345 | |
1346 return; | |
1347 | |
1348 } else if (cname) { | |
1349 | |
1350 /* CNAME only */ | |
1351 | |
1352 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) { | |
1353 return; | |
1354 } | |
1355 | |
1356 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1357 "resolver cname:\"%V\"", &name); | |
1358 | |
1741
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1359 ngx_queue_remove(&rn->queue); |
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1360 |
1649 | 1361 rn->cnlen = (u_short) name.len; |
1362 rn->u.cname = name.data; | |
1363 rn->valid = ngx_time() + r->valid; | |
1364 rn->expire = ngx_time() + r->expire; | |
1365 | |
1366 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
1367 | |
1368 ctx = rn->waiting; | |
1369 rn->waiting = NULL; | |
1370 | |
1371 if (ctx) { | |
1372 ctx->name = name; | |
1373 | |
1374 (void) ngx_resolve_name_locked(r, ctx); | |
1375 } | |
1376 | |
1377 return; | |
1378 } | |
1379 | |
1380 ngx_log_error(r->log_level, r->log, 0, | |
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1381 "no A or CNAME types in DNS responses, unknown query type: %ui", |
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1382 qtype); |
1649 | 1383 return; |
1384 | |
1385 short_response: | |
1386 | |
1387 err = "short dns response"; | |
1388 | |
1389 invalid: | |
1390 | |
1391 /* unlock name mutex */ | |
1392 | |
1393 ngx_log_error(r->log_level, r->log, 0, err); | |
1394 | |
1395 return; | |
1396 | |
1397 failed: | |
1398 | |
1399 /* unlock name mutex */ | |
1400 | |
1401 return; | |
1402 } | |
1403 | |
1404 | |
1405 static void | |
1406 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
|
1407 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan) |
1649 | 1408 { |
1409 char *err; | |
1410 size_t len; | |
1411 in_addr_t addr; | |
1412 ngx_int_t digit; | |
1413 ngx_str_t name; | |
1414 ngx_uint_t i, mask, qtype, qclass, qident; | |
1415 ngx_resolver_an_t *an; | |
1416 ngx_resolver_ctx_t *ctx, *next; | |
1417 ngx_resolver_node_t *rn; | |
1418 | |
1419 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) { | |
1420 goto invalid_in_addr_arpa; | |
1421 } | |
1422 | |
1423 addr = 0; | |
1424 i = 12; | |
1425 | |
1426 for (mask = 0; mask < 32; mask += 8) { | |
1427 len = buf[i++]; | |
1428 | |
1429 digit = ngx_atoi(&buf[i], len); | |
1430 if (digit == NGX_ERROR || digit > 255) { | |
1431 goto invalid_in_addr_arpa; | |
1432 } | |
1433 | |
1434 addr += digit << mask; | |
1435 i += len; | |
1436 } | |
1437 | |
1438 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) { | |
1439 goto invalid_in_addr_arpa; | |
1440 } | |
1441 | |
1442 /* lock addr mutex */ | |
1443 | |
1444 rn = ngx_resolver_lookup_addr(r, addr); | |
1445 | |
1446 if (rn == NULL || rn->query == NULL) { | |
1447 ngx_log_error(r->log_level, r->log, 0, | |
1448 "unexpected response for %ud.%ud.%ud.%ud", | |
1449 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
1450 (addr >> 8) & 0xff, addr & 0xff); | |
1451 goto failed; | |
1452 } | |
1453 | |
1454 qident = (rn->query[0] << 8) + rn->query[1]; | |
1455 | |
1456 if (ident != qident) { | |
1457 ngx_log_error(r->log_level, r->log, 0, | |
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1458 "wrong ident %ui response for %ud.%ud.%ud.%ud, expect %ui", |
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1459 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff, |
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1460 (addr >> 8) & 0xff, addr & 0xff, qident); |
1649 | 1461 goto failed; |
1462 } | |
1463 | |
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1464 if (code == 0 && nan == 0) { |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1465 code = 3; /* NXDOMAIN */ |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1466 } |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1467 |
1649 | 1468 if (code) { |
1469 next = rn->waiting; | |
1470 rn->waiting = NULL; | |
1471 | |
1472 ngx_queue_remove(&rn->queue); | |
1473 | |
1474 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
1475 | |
1476 ngx_resolver_free_node(r, rn); | |
1477 | |
1478 /* unlock addr mutex */ | |
1479 | |
1480 while (next) { | |
1481 ctx = next; | |
1482 ctx->state = code; | |
1483 next = ctx->next; | |
1484 | |
1485 ctx->handler(ctx); | |
1486 } | |
1487 | |
1488 return; | |
1489 } | |
1490 | |
1491 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t); | |
1492 | |
1493 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) { | |
1494 goto short_response; | |
1495 } | |
1496 | |
1497 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */ | |
1498 | |
1499 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) { | |
1500 err = "invalid in-addr.arpa name in DNS response"; | |
1501 goto invalid; | |
1502 } | |
1503 | |
1504 an = (ngx_resolver_an_t *) &buf[i + 2]; | |
1505 | |
1506 qtype = (an->type_hi << 8) + an->type_lo; | |
1507 qclass = (an->class_hi << 8) + an->class_lo; | |
1508 len = (an->len_hi << 8) + an->len_lo; | |
1509 | |
1510 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1511 "resolver qt:%ui cl:%ui len:%uz", qtype, qclass, len); |
1649 | 1512 |
1513 i += 2 + sizeof(ngx_resolver_an_t); | |
1514 | |
1515 if (i + len > (ngx_uint_t) n) { | |
1516 goto short_response; | |
1517 } | |
1518 | |
1519 len -= 2; | |
1520 | |
1521 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) { | |
1522 return; | |
1523 } | |
1524 | |
1525 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name); | |
1526 | |
1527 if (len != (size_t) rn->nlen || ngx_strncmp(name.data, rn->name, len) != 0) | |
1528 { | |
2482
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1529 if (rn->nlen) { |
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1530 ngx_resolver_free(r, rn->name); |
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1531 } |
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1532 |
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1533 rn->nlen = len; |
1649 | 1534 rn->name = name.data; |
1535 | |
1536 name.data = ngx_resolver_dup(r, rn->name, len); | |
1537 if (name.data == NULL) { | |
1538 goto failed; | |
1539 } | |
1540 } | |
1541 | |
1542 ngx_queue_remove(&rn->queue); | |
1543 | |
1544 rn->valid = ngx_time() + r->valid; | |
1545 rn->expire = ngx_time() + r->expire; | |
1546 | |
1547 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
1548 | |
1549 next = rn->waiting; | |
1550 rn->waiting = NULL; | |
1551 | |
1552 /* unlock addr mutex */ | |
1553 | |
1554 while (next) { | |
1555 ctx = next; | |
1556 ctx->state = NGX_OK; | |
1557 ctx->name = name; | |
1558 next = ctx->next; | |
1559 | |
1560 ctx->handler(ctx); | |
1561 } | |
1562 | |
1563 ngx_resolver_free(r, name.data); | |
1564 | |
1565 return; | |
1566 | |
1567 invalid_in_addr_arpa: | |
1568 | |
1569 ngx_log_error(r->log_level, r->log, 0, | |
1570 "invalid in-addr.arpa name in DNS response"); | |
1571 return; | |
1572 | |
1573 short_response: | |
1574 | |
1575 err = "short DNS response"; | |
1576 | |
1577 invalid: | |
1578 | |
1579 /* unlock addr mutex */ | |
1580 | |
1581 ngx_log_error(r->log_level, r->log, 0, err); | |
1582 | |
1583 return; | |
1584 | |
1585 failed: | |
1586 | |
1587 /* unlock addr mutex */ | |
1588 | |
1589 return; | |
1590 } | |
1591 | |
1592 | |
1593 static ngx_resolver_node_t * | |
1594 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) | |
1595 { | |
1596 ngx_int_t rc; | |
1597 size_t len; | |
1598 ngx_rbtree_node_t *node, *sentinel; | |
1599 ngx_resolver_node_t *rn; | |
1600 | |
1601 node = r->name_rbtree.root; | |
1602 sentinel = r->name_rbtree.sentinel; | |
1603 | |
1604 while (node != sentinel) { | |
1605 | |
1606 if (hash < node->key) { | |
1607 node = node->left; | |
1608 continue; | |
1609 } | |
1610 | |
1611 if (hash > node->key) { | |
1612 node = node->right; | |
1613 continue; | |
1614 } | |
1615 | |
1616 /* hash == node->key */ | |
1617 | |
1618 do { | |
1619 rn = (ngx_resolver_node_t *) node; | |
1620 | |
1621 len = (name->len > (size_t) rn->nlen) ? rn->nlen : name->len; | |
1622 | |
1623 rc = ngx_strncmp(name->data, rn->name, len); | |
1624 | |
1625 if (rc == 0) { | |
1626 return rn; | |
1627 } | |
1628 | |
1629 node = (rc < 0) ? node->left : node->right; | |
1630 | |
1631 } while (node != sentinel && hash == node->key); | |
1632 | |
1633 break; | |
1634 } | |
1635 | |
1636 /* not found */ | |
1637 | |
1638 return NULL; | |
1639 } | |
1640 | |
1641 | |
1642 static ngx_resolver_node_t * | |
1643 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr) | |
1644 { | |
1645 ngx_rbtree_node_t *node, *sentinel; | |
1646 | |
1647 node = r->addr_rbtree.root; | |
1648 sentinel = r->addr_rbtree.sentinel; | |
1649 | |
1650 while (node != sentinel) { | |
1651 | |
1652 if (addr < node->key) { | |
1653 node = node->left; | |
1654 continue; | |
1655 } | |
1656 | |
1657 if (addr > node->key) { | |
1658 node = node->right; | |
1659 continue; | |
1660 } | |
1661 | |
1662 /* addr == node->key */ | |
1663 | |
1664 return (ngx_resolver_node_t *) node; | |
1665 } | |
1666 | |
1667 /* not found */ | |
1668 | |
1669 return NULL; | |
1670 } | |
1671 | |
1672 | |
1673 static void | |
1674 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
1675 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
1676 { | |
1677 size_t len; | |
1678 ngx_rbtree_node_t **p; | |
1679 ngx_resolver_node_t *rn, *rn_temp; | |
1680 | |
1681 for ( ;; ) { | |
1682 | |
1683 if (node->key < temp->key) { | |
1684 | |
1685 p = &temp->left; | |
1686 | |
1687 } else if (node->key > temp->key) { | |
1688 | |
1689 p = &temp->right; | |
1690 | |
1691 } else { /* node->key == temp->key */ | |
1692 | |
1693 rn = (ngx_resolver_node_t *) node; | |
1694 rn_temp = (ngx_resolver_node_t *) temp; | |
1695 | |
1696 len = (rn->nlen > rn_temp->nlen) ? rn_temp->nlen : rn->nlen; | |
1697 | |
1698 p = (ngx_strncmp(rn->name, rn_temp->name, len) < 0) | |
1699 ? &temp->left : &temp->right; | |
1700 } | |
1701 | |
1702 if (*p == sentinel) { | |
1703 break; | |
1704 } | |
1705 | |
1706 temp = *p; | |
1707 } | |
1708 | |
1709 *p = node; | |
1710 node->parent = temp; | |
1711 node->left = sentinel; | |
1712 node->right = sentinel; | |
1713 ngx_rbt_red(node); | |
1714 } | |
1715 | |
1716 | |
1717 static ngx_int_t | |
1718 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
1719 { | |
1720 u_char *p, *s; | |
1721 size_t len; | |
1722 ngx_uint_t ident; | |
1723 ngx_resolver_qs_t *qs; | |
1724 ngx_resolver_query_t *query; | |
1725 | |
1726 len = sizeof(ngx_resolver_query_t) | |
1727 + 1 + ctx->name.len + 1 + sizeof(ngx_resolver_qs_t); | |
1728 | |
1729 p = ngx_resolver_calloc(ctx->resolver, len); | |
1730 if (p == NULL) { | |
1731 return NGX_ERROR; | |
1732 } | |
1733 | |
1734 rn->qlen = (u_short) len; | |
1735 rn->query = p; | |
1736 | |
1737 query = (ngx_resolver_query_t *) p; | |
1738 | |
1739 ident = ngx_random(); | |
1740 | |
1741 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0, | |
1742 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff); | |
1743 | |
1744 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
1745 query->ident_lo = (u_char) (ident & 0xff); | |
1746 | |
1747 /* recursion query */ | |
1748 query->flags_hi = 1; query->flags_lo = 0; | |
1749 | |
1750 /* one question */ | |
1751 query->nqs_hi = 0; query->nqs_lo = 1; | |
1752 query->nan_hi = 0; query->nan_lo = 0; | |
1753 query->nns_hi = 0; query->nns_lo = 0; | |
1754 query->nar_hi = 0; query->nar_lo = 0; | |
1755 | |
1756 p += sizeof(ngx_resolver_query_t) + 1 + ctx->name.len + 1; | |
1757 | |
1758 qs = (ngx_resolver_qs_t *) p; | |
1759 | |
1760 /* query type */ | |
1761 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type; | |
1762 | |
1763 /* IP query class */ | |
1764 qs->class_hi = 0; qs->class_lo = 1; | |
1765 | |
1766 /* convert "www.example.com" to "\3www\7example\3com\0" */ | |
1767 | |
1768 len = 0; | |
1769 p--; | |
1770 *p-- = '\0'; | |
1771 | |
1772 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) { | |
1773 if (*s != '.') { | |
1774 *p = *s; | |
1775 len++; | |
1776 | |
1777 } else { | |
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
1778 if (len == 0) { |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
1779 return NGX_DECLINED; |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
1780 } |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
1781 |
1649 | 1782 *p = (u_char) len; |
1783 len = 0; | |
1784 } | |
1785 | |
1786 p--; | |
1787 } | |
1788 | |
1789 *p = (u_char) len; | |
1790 | |
1791 return NGX_OK; | |
1792 } | |
1793 | |
1794 | |
1795 /* AF_INET only */ | |
1796 | |
1797 static ngx_int_t | |
1798 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
1799 { | |
1800 u_char *p, *d; | |
1801 size_t len; | |
1802 ngx_int_t n; | |
1803 ngx_uint_t ident; | |
1804 ngx_resolver_query_t *query; | |
1805 | |
1806 len = sizeof(ngx_resolver_query_t) | |
1807 + sizeof(".255.255.255.255.in-addr.arpa.") - 1 | |
1808 + sizeof(ngx_resolver_qs_t); | |
1809 | |
1810 p = ngx_resolver_calloc(ctx->resolver, len); | |
1811 if (p == NULL) { | |
1812 return NGX_ERROR; | |
1813 } | |
1814 | |
1815 rn->query = p; | |
1816 query = (ngx_resolver_query_t *) p; | |
1817 | |
1818 ident = ngx_random(); | |
1819 | |
1820 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
1821 query->ident_lo = (u_char) (ident & 0xff); | |
1822 | |
1823 /* recursion query */ | |
1824 query->flags_hi = 1; query->flags_lo = 0; | |
1825 | |
1826 /* one question */ | |
1827 query->nqs_hi = 0; query->nqs_lo = 1; | |
1828 query->nan_hi = 0; query->nan_lo = 0; | |
1829 query->nns_hi = 0; query->nns_lo = 0; | |
1830 query->nar_hi = 0; query->nar_lo = 0; | |
1831 | |
1832 p += sizeof(ngx_resolver_query_t); | |
1833 | |
1834 for (n = 0; n < 32; n += 8){ | |
1835 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff); | |
1836 *p = (u_char) (d - &p[1]); | |
1837 p = d; | |
1838 } | |
1839 | |
1840 /* query type "PTR", IP query class */ | |
1841 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18); | |
1842 | |
1843 rn->qlen = (u_short) | |
1844 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t) | |
1845 - rn->query); | |
1846 | |
1847 return NGX_OK; | |
1848 } | |
1849 | |
1850 | |
1851 static ngx_int_t | |
1852 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src, | |
1853 u_char *last) | |
1854 { | |
1855 char *err; | |
1856 u_char *p, *dst; | |
1857 ssize_t len; | |
1858 ngx_uint_t i, n; | |
1859 | |
1860 p = src; | |
1861 len = -1; | |
1862 | |
1863 /* | |
1864 * compression pointers allow to create endless loop, so we set limit; | |
1865 * 128 pointers should be enough to store 255-byte name | |
1866 */ | |
1867 | |
1868 for (i = 0; i < 128; i++) { | |
1869 n = *p++; | |
1870 | |
1871 if (n == 0) { | |
1872 goto done; | |
1873 } | |
1874 | |
1875 if (n & 0xc0) { | |
2314
52987a023486
fix compression pointer for big (>255) DNS responses
Igor Sysoev <igor@sysoev.ru>
parents:
2282
diff
changeset
|
1876 n = ((n & 0x3f) << 8) + *p; |
1649 | 1877 p = &buf[n]; |
1878 | |
1879 } else { | |
1880 len += 1 + n; | |
1881 p = &p[n]; | |
1882 } | |
1883 | |
1884 if (p >= last) { | |
1885 err = "name is out of response"; | |
1886 goto invalid; | |
1887 } | |
1888 } | |
1889 | |
1890 err = "compression pointers loop"; | |
1891 | |
1892 invalid: | |
1893 | |
1894 ngx_log_error(r->log_level, r->log, 0, err); | |
1895 | |
1896 return NGX_ERROR; | |
1897 | |
1898 done: | |
1899 | |
1900 if (name == NULL) { | |
583 | 1901 return NGX_OK; |
1902 } | |
1903 | |
1649 | 1904 dst = ngx_resolver_alloc(r, len); |
1905 if (dst == NULL) { | |
1906 return NGX_ERROR; | |
1907 } | |
1908 | |
1909 name->data = dst; | |
1910 | |
1911 n = *src++; | |
1912 | |
1913 for ( ;; ) { | |
1914 if (n != 0xc0) { | |
1915 ngx_memcpy(dst, src, n); | |
1916 dst += n; | |
1917 src += n; | |
1918 | |
1919 n = *src++; | |
1920 | |
1921 if (n != 0) { | |
1922 *dst++ = '.'; | |
1923 } | |
1924 | |
1925 } else { | |
2314
52987a023486
fix compression pointer for big (>255) DNS responses
Igor Sysoev <igor@sysoev.ru>
parents:
2282
diff
changeset
|
1926 n = ((n & 0x3f) << 8) + *src; |
1649 | 1927 src = &buf[n]; |
1928 | |
1929 n = *src++; | |
1930 } | |
1931 | |
1932 if (n == 0) { | |
1933 name->len = dst - name->data; | |
1934 return NGX_OK; | |
1935 } | |
1936 } | |
1937 } | |
1938 | |
1939 | |
1940 static void | |
1941 ngx_resolver_timeout_handler(ngx_event_t *ev) | |
1942 { | |
1943 ngx_resolver_ctx_t *ctx; | |
1944 | |
1945 ctx = ev->data; | |
1946 | |
1947 ctx->state = NGX_RESOLVE_TIMEDOUT; | |
1948 | |
1949 ctx->handler(ctx); | |
1950 } | |
1951 | |
1952 | |
1953 static void | |
1954 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
1955 { | |
1956 /* lock alloc mutex */ | |
1957 | |
1958 if (rn->query) { | |
1959 ngx_resolver_free_locked(r, rn->query); | |
1960 } | |
1961 | |
1962 if (rn->name) { | |
1963 ngx_resolver_free_locked(r, rn->name); | |
1964 } | |
1965 | |
1966 if (rn->cnlen) { | |
1967 ngx_resolver_free_locked(r, rn->u.cname); | |
1968 } | |
1969 | |
1970 if (rn->naddrs > 1) { | |
1971 ngx_resolver_free_locked(r, rn->u.addrs); | |
1972 } | |
1973 | |
1974 ngx_resolver_free_locked(r, rn); | |
1975 | |
1976 /* unlock alloc mutex */ | |
1977 } | |
1978 | |
1979 | |
1980 static void * | |
1981 ngx_resolver_alloc(ngx_resolver_t *r, size_t size) | |
1982 { | |
1983 u_char *p; | |
1984 | |
1985 /* lock alloc mutex */ | |
1986 | |
1987 p = ngx_alloc(size, r->log); | |
1988 | |
1989 /* unlock alloc mutex */ | |
1990 | |
1991 return p; | |
1992 } | |
1993 | |
1994 | |
1903 | 1995 static void * |
1649 | 1996 ngx_resolver_calloc(ngx_resolver_t *r, size_t size) |
1997 { | |
1998 u_char *p; | |
1999 | |
2000 p = ngx_resolver_alloc(r, size); | |
2001 | |
2002 if (p) { | |
2003 ngx_memzero(p, size); | |
2004 } | |
2005 | |
2006 return p; | |
2007 } | |
2008 | |
2009 | |
2010 static void | |
2011 ngx_resolver_free(ngx_resolver_t *r, void *p) | |
2012 { | |
2013 /* lock alloc mutex */ | |
2014 | |
2015 ngx_free(p); | |
2016 | |
2017 /* unlock alloc mutex */ | |
2018 } | |
2019 | |
2020 | |
2021 static void | |
2022 ngx_resolver_free_locked(ngx_resolver_t *r, void *p) | |
2023 { | |
2024 ngx_free(p); | |
2025 } | |
2026 | |
2027 | |
2028 static void * | |
2029 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size) | |
2030 { | |
2031 void *dst; | |
2032 | |
2033 dst = ngx_resolver_alloc(r, size); | |
2034 | |
2035 if (dst == NULL) { | |
2036 return dst; | |
2037 } | |
2038 | |
2039 ngx_memcpy(dst, src, size); | |
2040 | |
2041 return dst; | |
2042 } | |
2043 | |
2044 | |
2045 char * | |
2046 ngx_resolver_strerror(ngx_int_t err) | |
2047 { | |
2048 static char *errors[] = { | |
2049 "Format error", /* FORMERR */ | |
2050 "Server failure", /* SERVFAIL */ | |
2051 "Host not found", /* NXDOMAIN */ | |
2052 "Unimplemented", /* NOTIMP */ | |
2053 "Operation refused" /* REFUSED */ | |
2054 }; | |
2055 | |
2056 if (err > 0 && err < 6) { | |
2057 return errors[err - 1]; | |
2058 } | |
2059 | |
2060 if (err == NGX_RESOLVE_TIMEDOUT) { | |
2061 return "Operation timed out"; | |
2062 } | |
2063 | |
2064 return "Unknown error"; | |
2065 } | |
2066 | |
2067 | |
2068 ngx_int_t | |
2069 ngx_udp_connect(ngx_udp_connection_t *uc) | |
2070 { | |
2071 int rc; | |
2072 ngx_int_t event; | |
2073 ngx_event_t *rev, *wev; | |
2074 ngx_socket_t s; | |
2075 ngx_connection_t *c; | |
2076 | |
583 | 2077 s = ngx_socket(AF_INET, SOCK_DGRAM, 0); |
2078 | |
1649 | 2079 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, uc->log, 0, "UDP socket %d", s); |
583 | 2080 |
2081 if (s == -1) { | |
1649 | 2082 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
583 | 2083 ngx_socket_n " failed"); |
2084 return NGX_ERROR; | |
2085 } | |
2086 | |
1649 | 2087 c = ngx_get_connection(s, uc->log); |
583 | 2088 |
2089 if (c == NULL) { | |
2090 if (ngx_close_socket(s) == -1) { | |
1649 | 2091 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
583 | 2092 ngx_close_socket_n "failed"); |
2093 } | |
2094 | |
2095 return NGX_ERROR; | |
2096 } | |
2097 | |
1649 | 2098 if (ngx_nonblocking(s) == -1) { |
2099 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
2100 ngx_nonblocking_n " failed"); | |
2101 | |
2102 ngx_free_connection(c); | |
2103 | |
2104 if (ngx_close_socket(s) == -1) { | |
2105 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
2106 ngx_close_socket_n " failed"); | |
2107 } | |
2108 | |
2109 return NGX_ERROR; | |
2110 } | |
2111 | |
583 | 2112 rev = c->read; |
2113 wev = c->write; | |
2114 | |
1649 | 2115 rev->log = uc->log; |
2116 wev->log = uc->log; | |
2117 | |
2118 uc->connection = c; | |
583 | 2119 |
2120 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); | |
2121 | |
2122 #if (NGX_THREADS) | |
1649 | 2123 |
2124 /* TODO: lock event when call completion handler */ | |
2125 | |
2126 rev->lock = &c->lock; | |
2127 wev->lock = &c->lock; | |
583 | 2128 rev->own_lock = &c->lock; |
2129 wev->own_lock = &c->lock; | |
1649 | 2130 |
583 | 2131 #endif |
2132 | |
1649 | 2133 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, uc->log, 0, |
2134 "connect to %V, fd:%d #%d", &uc->server, s, c->number); | |
2135 | |
2136 rc = connect(s, uc->sockaddr, uc->socklen); | |
2137 | |
2138 /* TODO: aio, iocp */ | |
583 | 2139 |
2140 if (rc == -1) { | |
1649 | 2141 ngx_log_error(NGX_LOG_CRIT, uc->log, ngx_socket_errno, |
2142 "connect() to %V failed", &uc->server); | |
583 | 2143 |
2144 return NGX_ERROR; | |
2145 } | |
2146 | |
1649 | 2147 /* UDP sockets are always ready to write */ |
2148 wev->ready = 1; | |
2149 | |
2150 if (ngx_add_event) { | |
2151 | |
2152 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ? | |
2153 /* kqueue, epoll */ NGX_CLEAR_EVENT: | |
2154 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT; | |
2155 /* eventport event type has no meaning: oneshot only */ | |
2156 | |
2157 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { | |
2158 return NGX_ERROR; | |
2159 } | |
2160 | |
2161 } else { | |
2162 /* rtsig */ | |
2163 | |
583 | 2164 if (ngx_add_conn(c) == NGX_ERROR) { |
2165 return NGX_ERROR; | |
2166 } | |
2167 } | |
2168 | |
2169 return NGX_OK; | |
2170 } |