Mercurial > hg > nginx-quic
annotate src/core/ngx_resolver.c @ 1900:55a9d867e3c8
avoid endless loop if epoll is used
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Tue, 19 Feb 2008 16:30:54 +0000 |
parents | d8de75fe31ec |
children | 1ea922585517 |
rev | line source |
---|---|
583 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4 */ | |
5 | |
6 | |
7 #include <ngx_config.h> | |
8 #include <ngx_core.h> | |
9 #include <ngx_event.h> | |
10 | |
11 | |
1649 | 12 #define NGX_RESOLVER_UDP_SIZE 4096 |
13 | |
14 | |
583 | 15 typedef struct { |
1649 | 16 u_char ident_hi; |
17 u_char ident_lo; | |
18 u_char flags_hi; | |
19 u_char flags_lo; | |
20 u_char nqs_hi; | |
21 u_char nqs_lo; | |
22 u_char nan_hi; | |
23 u_char nan_lo; | |
24 u_char nns_hi; | |
25 u_char nns_lo; | |
26 u_char nar_hi; | |
27 u_char nar_lo; | |
28 } ngx_resolver_query_t; | |
29 | |
30 | |
31 typedef struct { | |
32 u_char type_hi; | |
33 u_char type_lo; | |
34 u_char class_hi; | |
35 u_char class_lo; | |
36 } ngx_resolver_qs_t; | |
37 | |
38 | |
39 typedef struct { | |
40 u_char type_hi; | |
41 u_char type_lo; | |
42 u_char class_hi; | |
43 u_char class_lo; | |
44 u_char ttl[4]; | |
45 u_char len_hi; | |
46 u_char len_lo; | |
47 } ngx_resolver_an_t; | |
48 | |
49 | |
50 ngx_int_t ngx_udp_connect(ngx_udp_connection_t *uc); | |
51 | |
52 | |
53 static ngx_int_t ngx_resolve_name_locked(ngx_resolver_t *r, | |
54 ngx_resolver_ctx_t *ctx); | |
55 static void ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
56 ngx_queue_t *queue); | |
57 static ngx_int_t ngx_resolver_send_query(ngx_resolver_t *r, | |
58 ngx_resolver_node_t *rn); | |
59 static ngx_int_t ngx_resolver_create_name_query(ngx_resolver_node_t *rn, | |
60 ngx_resolver_ctx_t *ctx); | |
61 static ngx_int_t ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, | |
62 ngx_resolver_ctx_t *ctx); | |
63 static void ngx_resolver_resend_handler(ngx_event_t *ev); | |
64 static time_t ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
65 ngx_queue_t *queue); | |
66 static void ngx_resolver_read_response(ngx_event_t *rev); | |
67 static void ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, | |
68 size_t n); | |
69 static void ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t n, | |
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
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parents:
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changeset
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70 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans); |
1649 | 71 static void ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, |
1742
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no answers in DNS response should be NXDOMAIN
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parents:
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72 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan); |
1649 | 73 static ngx_resolver_node_t *ngx_resolver_lookup_name(ngx_resolver_t *r, |
74 ngx_str_t *name, uint32_t hash); | |
75 static ngx_resolver_node_t *ngx_resolver_lookup_addr(ngx_resolver_t *r, | |
76 in_addr_t addr); | |
77 static void ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
78 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel); | |
79 static ngx_int_t ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, | |
80 u_char *buf, u_char *src, u_char *last); | |
81 static void ngx_resolver_timeout_handler(ngx_event_t *ev); | |
82 static void ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn); | |
83 static void *ngx_resolver_alloc(ngx_resolver_t *r, size_t size); | |
84 static void ngx_resolver_free(ngx_resolver_t *r, void *p); | |
85 static void ngx_resolver_free_locked(ngx_resolver_t *r, void *p); | |
86 static void *ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size); | |
87 | |
88 | |
89 /* STUB: ngx_peer_addr_t * */ | |
90 | |
91 ngx_resolver_t * | |
92 ngx_resolver_create(ngx_peer_addr_t *addr, ngx_log_t *log) | |
93 { | |
94 ngx_resolver_t *r; | |
95 ngx_udp_connection_t *uc; | |
96 | |
97 r = ngx_calloc(sizeof(ngx_resolver_t), log); | |
98 if (r == NULL) { | |
99 return NULL; | |
100 } | |
101 | |
102 r->event = ngx_calloc(sizeof(ngx_event_t), log); | |
103 if (r->event == NULL) { | |
104 return NULL; | |
105 } | |
106 | |
1687 | 107 ngx_rbtree_init(&r->name_rbtree, &r->name_sentinel, |
108 ngx_resolver_rbtree_insert_value); | |
109 | |
110 ngx_rbtree_init(&r->addr_rbtree, &r->addr_sentinel, | |
111 ngx_rbtree_insert_value); | |
1649 | 112 |
1685 | 113 ngx_queue_init(&r->name_resend_queue); |
114 ngx_queue_init(&r->addr_resend_queue); | |
115 | |
116 ngx_queue_init(&r->name_expire_queue); | |
117 ngx_queue_init(&r->addr_expire_queue); | |
1649 | 118 |
119 r->event->handler = ngx_resolver_resend_handler; | |
120 r->event->data = r; | |
121 r->event->log = log; | |
122 r->ident = -1; | |
123 | |
124 r->resend_timeout = 5; | |
125 r->expire = 30; | |
126 r->valid = 300; | |
127 | |
128 r->log = log; | |
129 r->log_level = NGX_LOG_ALERT; | |
130 | |
1683
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allow to use IP addresses without defined resolver
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parents:
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131 if (addr) { |
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allow to use IP addresses without defined resolver
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parents:
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132 uc = ngx_calloc(sizeof(ngx_udp_connection_t), log); |
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allow to use IP addresses without defined resolver
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parents:
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133 if (uc == NULL) { |
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allow to use IP addresses without defined resolver
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parents:
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134 return NULL; |
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allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
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changeset
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135 } |
1e0b028055ec
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Igor Sysoev <igor@sysoev.ru>
parents:
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136 |
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parents:
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137 r->udp_connection = uc; |
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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138 |
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parents:
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139 uc->sockaddr = addr->sockaddr; |
1e0b028055ec
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parents:
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140 uc->socklen = addr->socklen; |
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
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141 uc->server = addr->name; |
1e0b028055ec
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Igor Sysoev <igor@sysoev.ru>
parents:
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diff
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142 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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143 } |
1649 | 144 |
145 return r; | |
146 } | |
147 | |
148 | |
149 ngx_resolver_ctx_t * | |
150 ngx_resolve_start(ngx_resolver_t *r, ngx_resolver_ctx_t *temp) | |
151 { | |
152 in_addr_t addr; | |
153 ngx_resolver_ctx_t *ctx; | |
154 | |
155 if (temp) { | |
156 addr = ngx_inet_addr(temp->name.data, temp->name.len); | |
157 | |
158 if (addr != INADDR_NONE) { | |
159 temp->resolver = r; | |
160 temp->state = NGX_OK; | |
161 temp->naddrs = 1; | |
162 temp->addrs = &temp->addr; | |
163 temp->addr = addr; | |
164 temp->quick = 1; | |
165 | |
166 return temp; | |
167 } | |
168 } | |
169 | |
1683
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allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
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170 if (r->udp_connection == NULL) { |
1e0b028055ec
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parents:
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171 return NGX_NO_RESOLVER; |
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allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
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changeset
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172 } |
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parents:
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173 |
1649 | 174 ctx = ngx_resolver_calloc(r, sizeof(ngx_resolver_ctx_t)); |
175 | |
176 if (ctx) { | |
177 ctx->resolver = r; | |
178 } | |
179 | |
180 return ctx; | |
181 } | |
182 | |
183 | |
184 ngx_int_t | |
185 ngx_resolve_name(ngx_resolver_ctx_t *ctx) | |
186 { | |
187 ngx_int_t rc; | |
188 ngx_resolver_t *r; | |
189 | |
190 r = ctx->resolver; | |
191 | |
192 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
193 "resolve: \"%V\"", &ctx->name); | |
194 | |
195 if (ctx->quick) { | |
196 ctx->handler(ctx); | |
197 return NGX_OK; | |
198 } | |
199 | |
200 /* lock name mutex */ | |
201 | |
202 rc = ngx_resolve_name_locked(r, ctx); | |
203 | |
204 if (rc == NGX_OK) { | |
205 return NGX_OK; | |
206 } | |
207 | |
208 /* unlock name mutex */ | |
209 | |
210 if (rc == NGX_AGAIN) { | |
211 return NGX_OK; | |
212 } | |
213 | |
214 /* lock alloc mutex */ | |
215 | |
216 if (ctx->event) { | |
217 ngx_resolver_free_locked(r, ctx->event); | |
1880 | 218 ctx->event = NULL; |
1649 | 219 } |
220 | |
221 /* unlock alloc mutex */ | |
222 | |
223 return NGX_ERROR; | |
224 } | |
225 | |
226 | |
227 void | |
228 ngx_resolve_name_done(ngx_resolver_ctx_t *ctx) | |
229 { | |
230 uint32_t hash; | |
231 ngx_resolver_t *r; | |
232 ngx_resolver_ctx_t *w, **p; | |
233 ngx_resolver_node_t *rn; | |
234 | |
235 r = ctx->resolver; | |
236 | |
237 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
238 "resolve name done: %i", ctx->state); | |
239 | |
240 if (ctx->quick) { | |
241 return; | |
242 } | |
243 | |
244 if (ctx->event && ctx->event->timer_set) { | |
245 ngx_del_timer(ctx->event); | |
246 } | |
247 | |
248 /* lock name mutex */ | |
249 | |
250 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
251 | |
252 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
253 | |
254 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
255 | |
256 if (rn) { | |
257 p = &rn->waiting; | |
258 w = rn->waiting; | |
259 | |
260 while (w) { | |
261 if (w == ctx) { | |
262 *p = w->next; | |
263 | |
264 goto done; | |
265 } | |
266 | |
267 p = &w->next; | |
268 w = w->next; | |
269 } | |
270 } | |
271 | |
272 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
273 "could not cancel %V resolving", &ctx->name); | |
274 } | |
275 | |
276 done: | |
277 | |
278 ngx_resolver_expire(r, &r->name_rbtree, &r->name_expire_queue); | |
279 | |
280 /* unlock name mutex */ | |
281 | |
282 ngx_resolver_free(r, ctx); | |
283 } | |
284 | |
285 | |
286 /* NGX_RESOLVE_A only */ | |
287 | |
288 static ngx_int_t | |
289 ngx_resolve_name_locked(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx) | |
290 { | |
291 uint32_t hash; | |
292 in_addr_t addr, *addrs; | |
293 ngx_uint_t naddrs; | |
294 ngx_resolver_ctx_t *next; | |
295 ngx_resolver_node_t *rn; | |
296 | |
297 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
298 | |
299 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
300 | |
301 if (rn) { | |
302 | |
303 if (rn->valid >= ngx_time()) { | |
304 | |
305 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
306 | |
307 ngx_queue_remove(&rn->queue); | |
308 | |
309 rn->expire = ngx_time() + r->expire; | |
310 | |
311 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
312 | |
313 naddrs = rn->naddrs; | |
314 | |
315 if (naddrs) { | |
316 | |
317 /* NGX_RESOLVE_A answer */ | |
318 | |
319 if (naddrs != 1) { | |
320 addr = 0; | |
321 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
322 naddrs * sizeof(in_addr_t)); | |
323 if (addrs == NULL) { | |
324 return NGX_ERROR; | |
325 } | |
326 | |
327 } else { | |
328 addr = rn->u.addr; | |
329 addrs = NULL; | |
330 } | |
331 | |
332 ctx->next = rn->waiting; | |
333 rn->waiting = NULL; | |
334 | |
335 /* unlock name mutex */ | |
336 | |
337 do { | |
338 ctx->state = NGX_OK; | |
339 ctx->naddrs = naddrs; | |
340 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
341 ctx->addr = addr; | |
342 next = ctx->next; | |
343 | |
344 ctx->handler(ctx); | |
345 | |
346 ctx = next; | |
347 } while (ctx); | |
348 | |
349 if (addrs) { | |
350 ngx_resolver_free(r, addrs); | |
351 } | |
352 | |
353 return NGX_OK; | |
354 } | |
355 | |
356 /* NGX_RESOLVE_CNAME */ | |
357 | |
358 ctx->name.len = rn->cnlen; | |
359 ctx->name.data = rn->u.cname; | |
360 | |
361 return ngx_resolve_name_locked(r, ctx); | |
362 } | |
363 | |
364 if (rn->waiting) { | |
365 | |
366 ctx->next = rn->waiting; | |
367 rn->waiting = ctx; | |
368 | |
369 return NGX_AGAIN; | |
370 } | |
371 | |
372 ngx_queue_remove(&rn->queue); | |
373 | |
374 /* lock alloc mutex */ | |
375 | |
376 ngx_resolver_free_locked(r, rn->query); | |
377 | |
378 if (rn->cnlen) { | |
379 ngx_resolver_free_locked(r, rn->u.cname); | |
380 } | |
381 | |
382 if (rn->naddrs > 1) { | |
383 ngx_resolver_free_locked(r, rn->u.addrs); | |
384 } | |
385 | |
386 /* unlock alloc mutex */ | |
387 | |
388 } else { | |
389 | |
390 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
391 if (rn == NULL) { | |
392 return NGX_ERROR; | |
393 } | |
394 | |
395 rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len); | |
396 if (rn->name == NULL) { | |
397 ngx_resolver_free(r, rn); | |
398 return NGX_ERROR; | |
399 } | |
400 | |
401 rn->node.key = hash; | |
402 rn->nlen = (u_short) ctx->name.len; | |
403 | |
404 ngx_rbtree_insert(&r->name_rbtree, &rn->node); | |
405 } | |
406 | |
407 if (ngx_resolver_create_name_query(rn, ctx) != NGX_OK) { | |
408 goto failed; | |
409 } | |
410 | |
411 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
412 goto failed; | |
413 } | |
414 | |
415 if (ctx->event == NULL) { | |
416 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
417 if (ctx->event == NULL) { | |
418 goto failed; | |
419 } | |
420 | |
421 ctx->event->handler = ngx_resolver_timeout_handler; | |
422 ctx->event->data = ctx; | |
423 ctx->event->log = r->log; | |
424 ctx->ident = -1; | |
425 | |
426 ngx_add_timer(ctx->event, ctx->timeout); | |
427 } | |
428 | |
429 if (ngx_queue_empty(&r->name_resend_queue)) { | |
430 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
431 } | |
432 | |
433 rn->expire = ngx_time() + r->resend_timeout; | |
434 | |
435 ngx_queue_insert_head(&r->name_resend_queue, &rn->queue); | |
436 | |
437 rn->cnlen = 0; | |
438 rn->naddrs = 0; | |
439 rn->valid = 0; | |
440 rn->waiting = ctx; | |
441 | |
442 ctx->state = NGX_AGAIN; | |
443 | |
444 return NGX_AGAIN; | |
445 | |
446 failed: | |
447 | |
448 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
449 | |
450 ngx_resolver_free(r, rn->name); | |
451 | |
452 ngx_resolver_free(r, rn); | |
453 | |
454 return NGX_ERROR; | |
455 } | |
583 | 456 |
457 | |
458 ngx_int_t | |
1649 | 459 ngx_resolve_addr(ngx_resolver_ctx_t *ctx) |
460 { | |
461 ngx_resolver_t *r; | |
462 ngx_resolver_node_t *rn; | |
463 | |
464 r = ctx->resolver; | |
465 | |
466 ctx->addr = ntohl(ctx->addr); | |
467 | |
468 /* lock addr mutex */ | |
469 | |
470 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
471 | |
472 if (rn) { | |
473 | |
474 if (rn->valid >= ngx_time()) { | |
475 | |
476 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
477 | |
478 ngx_queue_remove(&rn->queue); | |
479 | |
480 rn->expire = ngx_time() + r->expire; | |
481 | |
482 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
483 | |
484 ctx->name.len = rn->nlen; | |
485 ctx->name.data = ngx_resolver_dup(r, rn->name, rn->nlen); | |
486 if (ctx->name.data == NULL) { | |
487 goto failed; | |
488 } | |
489 | |
490 /* unlock addr mutex */ | |
491 | |
492 ctx->state = NGX_OK; | |
493 | |
494 ctx->handler(ctx); | |
495 | |
496 ngx_resolver_free(r, ctx->name.data); | |
497 | |
498 return NGX_OK; | |
499 } | |
500 | |
501 if (rn->waiting) { | |
502 | |
503 ctx->next = rn->waiting; | |
504 rn->waiting = ctx; | |
505 | |
506 return NGX_AGAIN; | |
507 } | |
508 | |
509 ngx_queue_remove(&rn->queue); | |
510 | |
511 ngx_resolver_free(r, rn->query); | |
512 | |
513 } else { | |
514 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
515 if (rn == NULL) { | |
516 goto failed; | |
517 } | |
518 | |
519 rn->node.key = ctx->addr; | |
520 | |
521 ngx_rbtree_insert(&r->addr_rbtree, &rn->node); | |
522 } | |
523 | |
524 if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) { | |
525 goto failed; | |
526 } | |
527 | |
528 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
529 goto failed; | |
530 } | |
531 | |
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 if (ngx_queue_empty(&r->addr_resend_queue)) { | |
545 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
546 } | |
547 | |
548 rn->expire = ngx_time() + r->resend_timeout; | |
549 | |
550 ngx_queue_insert_head(&r->addr_resend_queue, &rn->queue); | |
551 | |
552 rn->cnlen = 0; | |
553 rn->naddrs = 0; | |
554 rn->name = NULL; | |
555 rn->nlen = 0; | |
556 rn->valid = 0; | |
557 rn->waiting = ctx; | |
558 | |
559 /* unlock addr mutex */ | |
560 | |
561 ctx->state = NGX_AGAIN; | |
562 | |
563 return NGX_OK; | |
564 | |
565 failed: | |
566 | |
567 if (rn) { | |
568 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
569 | |
570 ngx_resolver_free(r, rn); | |
571 } | |
572 | |
573 /* unlock addr mutex */ | |
574 | |
575 /* lock alloc mutex */ | |
576 | |
577 if (ctx->event) { | |
578 ngx_resolver_free_locked(r, ctx->event); | |
579 } | |
580 | |
581 ngx_resolver_free_locked(r, ctx); | |
582 | |
583 /* unlock alloc mutex */ | |
584 | |
585 return NGX_ERROR; | |
586 } | |
587 | |
588 | |
589 void | |
590 ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx) | |
591 { | |
592 in_addr_t addr; | |
593 ngx_resolver_t *r; | |
594 ngx_resolver_ctx_t *w, **p; | |
595 ngx_resolver_node_t *rn; | |
596 | |
597 r = ctx->resolver; | |
598 | |
599 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
600 "resolve addr done: %i", ctx->state); | |
601 | |
602 if (ctx->event && ctx->event->timer_set) { | |
603 ngx_del_timer(ctx->event); | |
604 } | |
605 | |
606 /* lock addr mutex */ | |
607 | |
608 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
609 | |
610 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
611 | |
612 if (rn) { | |
613 p = &rn->waiting; | |
614 w = rn->waiting; | |
615 | |
616 while (w) { | |
617 if (w == ctx) { | |
618 *p = w->next; | |
619 | |
620 goto done; | |
621 } | |
622 | |
623 p = &w->next; | |
624 w = w->next; | |
625 } | |
626 } | |
627 | |
628 addr = ntohl(ctx->addr); | |
629 | |
630 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
631 "could not cancel %ud.%ud.%ud.%ud resolving", | |
632 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
633 (addr >> 8) & 0xff, addr & 0xff); | |
634 } | |
635 | |
636 done: | |
637 | |
638 ngx_resolver_expire(r, &r->addr_rbtree, &r->addr_expire_queue); | |
639 | |
640 /* unlock addr mutex */ | |
641 | |
642 ngx_resolver_free(r, ctx); | |
643 } | |
644 | |
645 | |
646 static void | |
647 ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
648 { | |
649 time_t now; | |
650 ngx_uint_t i; | |
651 ngx_queue_t *q; | |
652 ngx_resolver_node_t *rn; | |
653 | |
654 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire"); | |
655 | |
656 now = ngx_time(); | |
657 | |
658 for (i = 0; i < 2; i++) { | |
659 if (ngx_queue_empty(queue)) { | |
660 return; | |
661 } | |
662 | |
663 q = ngx_queue_last(queue); | |
664 | |
665 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
666 | |
667 if (now <= rn->expire) { | |
668 return; | |
669 } | |
670 | |
1774 | 671 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, |
672 "resolver expire \"%*s\"", (size_t) rn->nlen, rn->name); | |
1649 | 673 |
674 ngx_queue_remove(q); | |
675 | |
676 ngx_rbtree_delete(tree, &rn->node); | |
677 | |
678 ngx_resolver_free_node(r, rn); | |
679 } | |
680 } | |
681 | |
682 | |
683 static ngx_int_t | |
684 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
685 { | |
686 ssize_t n; | |
687 ngx_udp_connection_t *uc; | |
688 | |
689 uc = r->udp_connection; | |
690 | |
691 if (uc->connection == NULL) { | |
692 if (ngx_udp_connect(uc) != NGX_OK) { | |
693 return NGX_ERROR; | |
694 } | |
695 | |
696 uc->connection->data = r; | |
697 uc->connection->read->handler = ngx_resolver_read_response; | |
698 } | |
699 | |
700 n = ngx_send(uc->connection, rn->query, rn->qlen); | |
701 | |
702 if (n == -1) { | |
703 return NGX_ERROR; | |
704 } | |
705 | |
706 if ((size_t) n != (size_t) rn->qlen) { | |
707 ngx_log_error(NGX_LOG_CRIT, uc->log, 0, "send() incomplete"); | |
708 return NGX_ERROR; | |
709 } | |
710 | |
711 return NGX_OK; | |
712 } | |
713 | |
714 | |
715 static void | |
716 ngx_resolver_resend_handler(ngx_event_t *ev) | |
717 { | |
718 time_t timer, atimer, ntimer; | |
719 ngx_resolver_t *r; | |
720 | |
721 r = ev->data; | |
722 | |
723 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, | |
724 "resolver resend handler"); | |
725 | |
726 /* lock name mutex */ | |
727 | |
728 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue); | |
729 | |
730 /* unlock name mutex */ | |
731 | |
732 /* lock addr mutex */ | |
733 | |
734 atimer = ngx_resolver_resend(r, &r->addr_rbtree, &r->addr_resend_queue); | |
1679
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parents:
1649
diff
changeset
|
735 |
1649 | 736 /* unlock addr mutex */ |
737 | |
738 if (ntimer == 0) { | |
739 timer = atimer; | |
740 | |
741 } else if (atimer == 0) { | |
742 timer = ntimer; | |
743 | |
744 } else { | |
745 timer = (atimer < ntimer) ? atimer : ntimer; | |
746 } | |
747 | |
748 if (timer) { | |
749 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000)); | |
750 } | |
751 } | |
752 | |
753 | |
754 static time_t | |
755 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
756 { | |
757 time_t now; | |
758 ngx_queue_t *q; | |
759 ngx_resolver_node_t *rn; | |
760 | |
761 now = ngx_time(); | |
762 | |
763 for ( ;; ) { | |
764 if (ngx_queue_empty(queue)) { | |
765 return 0; | |
766 } | |
767 | |
768 q = ngx_queue_last(queue); | |
769 | |
770 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
771 | |
772 if (now < rn->expire) { | |
773 return rn->expire - now; | |
774 } | |
775 | |
1774 | 776 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, |
777 "resolver resend \"%*s\" %p", | |
778 (size_t) rn->nlen, rn->name, rn->waiting); | |
1649 | 779 |
780 ngx_queue_remove(q); | |
781 | |
782 if (rn->waiting) { | |
783 | |
784 if (ngx_resolver_send_query(r, rn) == NGX_OK) { | |
785 | |
786 rn->expire = now + r->resend_timeout; | |
787 | |
788 ngx_queue_insert_head(queue, &rn->queue); | |
789 } | |
1879
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diff
changeset
|
790 |
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|
791 continue; |
1649 | 792 } |
793 | |
794 ngx_rbtree_delete(tree, &rn->node); | |
795 | |
796 ngx_resolver_free_node(r, rn); | |
797 } | |
798 } | |
799 | |
800 | |
801 static void | |
802 ngx_resolver_read_response(ngx_event_t *rev) | |
803 { | |
804 ssize_t n; | |
805 ngx_connection_t *c; | |
806 u_char buf[NGX_RESOLVER_UDP_SIZE]; | |
807 | |
808 c = rev->data; | |
809 | |
810 do { | |
1689 | 811 n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE); |
812 | |
813 if (n < 0) { | |
1649 | 814 return; |
815 } | |
816 | |
817 ngx_resolver_process_response(c->data, buf, n); | |
818 | |
819 } while (rev->ready); | |
820 } | |
821 | |
822 | |
823 static void | |
824 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n) | |
825 { | |
826 char *err; | |
827 size_t len; | |
828 ngx_uint_t i, ident, flags, code, nqs, nan, qtype, qclass; | |
829 ngx_resolver_qs_t *qs; | |
830 ngx_resolver_query_t *query; | |
831 | |
832 if ((size_t) n < sizeof(ngx_resolver_query_t) + 1) { | |
833 goto short_response; | |
834 } | |
835 | |
836 query = (ngx_resolver_query_t *) buf; | |
837 | |
838 ident = (query->ident_hi << 8) + query->ident_lo; | |
839 flags = (query->flags_hi << 8) + query->flags_lo; | |
840 nqs = (query->nqs_hi << 8) + query->nqs_lo; | |
841 nan = (query->nan_hi << 8) + query->nan_lo; | |
842 | |
843 ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0, | |
844 "resolver DNS response %d fl:%04Xud %d/%d/%d/%d", | |
845 ident, flags, nqs, nan, | |
846 (query->nns_hi << 8) + query->nns_lo, | |
847 (query->nar_hi << 8) + query->nar_lo); | |
848 | |
849 if (!(flags & 0x8000)) { | |
850 ngx_log_error(r->log_level, r->log, 0, | |
851 "invalid DNS response %d fl:%04Xud", ident, flags); | |
852 return; | |
853 } | |
854 | |
855 code = flags & 0x7f; | |
856 | |
857 if (code == NGX_RESOLVE_FORMERR || code > NGX_RESOLVE_REFUSED) { | |
858 ngx_log_error(r->log_level, r->log, 0, | |
859 "DNS error (%d: %s), query id:%d", | |
860 code, ngx_resolver_strerror(code), ident); | |
861 return; | |
862 } | |
863 | |
864 if (nqs != 1) { | |
865 err = "invalid number of questions in DNS response"; | |
866 goto done; | |
867 } | |
868 | |
869 i = sizeof(ngx_resolver_query_t); | |
870 | |
871 while (i < (ngx_uint_t) n) { | |
872 if (buf[i] == '\0') { | |
873 goto found; | |
874 } | |
875 | |
876 len = buf[i]; | |
877 i += 1 + len; | |
878 } | |
879 | |
880 goto short_response; | |
881 | |
882 found: | |
883 | |
884 if (i++ == 0) { | |
885 err = "zero-length domain name in DNS response"; | |
886 goto done; | |
887 } | |
888 | |
889 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t)) | |
890 > (ngx_uint_t) n) | |
891 { | |
892 goto short_response; | |
893 } | |
894 | |
895 qs = (ngx_resolver_qs_t *) &buf[i]; | |
896 | |
897 qtype = (qs->type_hi << 8) + qs->type_lo; | |
898 qclass = (qs->class_hi << 8) + qs->class_lo; | |
899 | |
900 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
901 "resolver DNS response qt:%d cl:%d", qtype, qclass); | |
902 | |
903 if (qclass != 1) { | |
904 ngx_log_error(r->log_level, r->log, 0, | |
905 "unknown query class %d in DNS response", qclass); | |
906 return; | |
907 } | |
908 | |
909 switch (qtype) { | |
910 | |
911 case NGX_RESOLVE_A: | |
912 | |
913 ngx_resolver_process_a(r, buf, n, ident, code, nan, | |
1742
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Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
914 i + sizeof(ngx_resolver_qs_t)); |
1649 | 915 |
916 break; | |
917 | |
918 case NGX_RESOLVE_PTR: | |
919 | |
1742
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parents:
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diff
changeset
|
920 ngx_resolver_process_ptr(r, buf, n, ident, code, nan); |
1649 | 921 |
922 break; | |
923 | |
924 default: | |
925 ngx_log_error(r->log_level, r->log, 0, | |
926 "unknown query type %d in DNS response", qtype); | |
927 return; | |
928 } | |
929 | |
930 return; | |
931 | |
932 short_response: | |
933 | |
934 err = "short dns response"; | |
935 | |
936 done: | |
937 | |
938 ngx_log_error(r->log_level, r->log, 0, err); | |
939 | |
940 return; | |
941 } | |
942 | |
943 | |
944 static void | |
945 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last, | |
946 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans) | |
583 | 947 { |
1649 | 948 char *err; |
949 u_char *cname; | |
950 size_t len; | |
951 uint32_t hash; | |
952 in_addr_t addr, *addrs; | |
953 ngx_str_t name; | |
954 ngx_uint_t qtype, qident, naddrs, a, i, n, start; | |
955 ngx_resolver_an_t *an; | |
956 ngx_resolver_ctx_t *ctx, *next; | |
957 ngx_resolver_node_t *rn; | |
958 | |
959 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) { | |
960 return; | |
961 } | |
962 | |
963 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); | |
964 | |
965 hash = ngx_crc32_short(name.data, name.len); | |
966 | |
967 /* lock name mutex */ | |
968 | |
969 rn = ngx_resolver_lookup_name(r, &name, hash); | |
970 | |
971 if (rn == NULL || rn->query == NULL) { | |
972 ngx_log_error(r->log_level, r->log, 0, | |
973 "unexpected response for %V", &name); | |
974 goto failed; | |
975 } | |
976 | |
977 qident = (rn->query[0] << 8) + rn->query[1]; | |
978 | |
979 if (ident != qident) { | |
980 ngx_log_error(r->log_level, r->log, 0, | |
981 "wrong ident %d response for %V, expect %d", | |
982 ident, &name, qident); | |
983 goto failed; | |
984 } | |
985 | |
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
986 if (code == 0 && nan == 0) { |
268b81386fe4
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parents:
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diff
changeset
|
987 code = 3; /* NXDOMAIN */ |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
988 } |
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parents:
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diff
changeset
|
989 |
1649 | 990 if (code) { |
991 next = rn->waiting; | |
992 rn->waiting = NULL; | |
993 | |
994 ngx_queue_remove(&rn->queue); | |
995 | |
996 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
997 | |
998 ngx_resolver_free_node(r, rn); | |
999 | |
1000 /* unlock name mutex */ | |
1001 | |
1002 while (next) { | |
1003 ctx = next; | |
1004 ctx->state = code; | |
1005 next = ctx->next; | |
1006 | |
1007 ctx->handler(ctx); | |
1008 } | |
1009 | |
1010 return; | |
1011 } | |
1012 | |
1013 i = ans; | |
1014 naddrs = 0; | |
1015 addr = 0; | |
1016 addrs = NULL; | |
1017 cname = NULL; | |
1018 qtype = 0; | |
1019 | |
1020 for (a = 0; a < nan; a++) { | |
1021 | |
1022 start = i; | |
1023 | |
1024 while (i < last) { | |
1025 | |
1026 if (buf[i] & 0xc0) { | |
1027 i += 2; | |
1028 goto found; | |
1029 } | |
1030 | |
1031 if (buf[i] == 0) { | |
1032 i++; | |
1033 goto test_length; | |
1034 } | |
1035 | |
1036 i += 1 + buf[i]; | |
1037 } | |
1038 | |
1039 goto short_response; | |
1040 | |
1041 test_length: | |
1042 | |
1043 if (i - start < 2) { | |
1044 err = "invalid name in dns response"; | |
1045 goto invalid; | |
1046 } | |
1047 | |
1048 found: | |
1049 | |
1050 if (i + sizeof(ngx_resolver_an_t) >= last) { | |
1051 goto short_response; | |
1052 } | |
1053 | |
1054 an = (ngx_resolver_an_t *) &buf[i]; | |
1055 | |
1056 qtype = (an->type_hi << 8) + an->type_lo; | |
1057 len = (an->len_hi << 8) + an->len_lo; | |
1058 | |
1059 if (qtype == NGX_RESOLVE_A) { | |
1060 | |
1061 i += sizeof(ngx_resolver_an_t); | |
1062 | |
1063 if (i + len > last) { | |
1064 goto short_response; | |
1065 } | |
1066 | |
1067 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
1068 + (buf[i + 2] << 8) + (buf[i + 3])); | |
1069 | |
1070 naddrs++; | |
1071 | |
1072 i += len; | |
1073 | |
1074 } else if (qtype == NGX_RESOLVE_CNAME) { | |
1075 cname = &buf[i] + sizeof(ngx_resolver_an_t); | |
1076 i += sizeof(ngx_resolver_an_t) + len; | |
1077 } | |
1078 } | |
1079 | |
1080 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1081 "resolver naddrs:%ui cname:%p", naddrs, cname); | |
1082 | |
1083 if (naddrs) { | |
1084 | |
1085 if (naddrs == 1) { | |
1086 rn->u.addr = addr; | |
1087 | |
1088 } else { | |
1089 | |
1090 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t)); | |
1091 if (addrs == NULL) { | |
1092 return; | |
1093 } | |
1094 | |
1095 n = 0; | |
1096 i = ans; | |
1097 | |
1098 for (a = 0; a < nan; a++) { | |
1099 | |
1100 for ( ;; ) { | |
1101 | |
1102 if (buf[i] & 0xc0) { | |
1103 i += 2; | |
1104 goto ok; | |
1105 } | |
1106 | |
1107 if (buf[i] == 0) { | |
1108 i++; | |
1109 goto ok; | |
1110 } | |
1111 | |
1112 i += 1 + buf[i]; | |
1113 } | |
1114 | |
1115 ok: | |
1116 | |
1117 an = (ngx_resolver_an_t *) &buf[i]; | |
1118 | |
1119 qtype = (an->type_hi << 8) + an->type_lo; | |
1120 len = (an->len_hi << 8) + an->len_lo; | |
1121 | |
1122 i += sizeof(ngx_resolver_an_t); | |
1123 | |
1124 if (qtype == NGX_RESOLVE_A) { | |
1125 | |
1126 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
1127 + (buf[i + 2] << 8) + (buf[i + 3])); | |
1128 | |
1129 if (n == naddrs) { | |
1130 break; | |
1131 } | |
1132 } | |
1133 | |
1134 i += len; | |
1135 } | |
1136 | |
1137 rn->u.addrs = addrs; | |
1138 | |
1139 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
1140 naddrs * sizeof(in_addr_t)); | |
1141 if (addrs == NULL) { | |
1142 return; | |
1143 } | |
1144 } | |
1145 | |
1146 rn->naddrs = (u_short) naddrs; | |
1147 | |
1148 ngx_queue_remove(&rn->queue); | |
1149 | |
1150 rn->valid = ngx_time() + r->valid; | |
1151 rn->expire = ngx_time() + r->expire; | |
1152 | |
1153 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
1154 | |
1155 next = rn->waiting; | |
1156 rn->waiting = NULL; | |
1157 | |
1158 /* unlock name mutex */ | |
1159 | |
1160 while (next) { | |
1161 ctx = next; | |
1162 ctx->state = NGX_OK; | |
1163 ctx->naddrs = naddrs; | |
1164 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
1165 ctx->addr = addr; | |
1166 next = ctx->next; | |
1167 | |
1168 ctx->handler(ctx); | |
1169 } | |
1170 | |
1171 if (naddrs) { | |
1172 ngx_resolver_free(r, addrs); | |
1173 } | |
1174 | |
1175 return; | |
1176 | |
1177 } else if (cname) { | |
1178 | |
1179 /* CNAME only */ | |
1180 | |
1181 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) { | |
1182 return; | |
1183 } | |
1184 | |
1185 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1186 "resolver cname:\"%V\"", &name); | |
1187 | |
1741
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1188 ngx_queue_remove(&rn->queue); |
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1189 |
1649 | 1190 rn->cnlen = (u_short) name.len; |
1191 rn->u.cname = name.data; | |
1192 rn->valid = ngx_time() + r->valid; | |
1193 rn->expire = ngx_time() + r->expire; | |
1194 | |
1195 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
1196 | |
1197 ctx = rn->waiting; | |
1198 rn->waiting = NULL; | |
1199 | |
1200 if (ctx) { | |
1201 ctx->name = name; | |
1202 | |
1203 (void) ngx_resolve_name_locked(r, ctx); | |
1204 } | |
1205 | |
1206 return; | |
1207 } | |
1208 | |
1209 ngx_log_error(r->log_level, r->log, 0, | |
1210 "no A or CNAME types in DNS responses, unknown query type: %d", | |
1211 qtype); | |
1212 return; | |
1213 | |
1214 short_response: | |
1215 | |
1216 err = "short dns response"; | |
1217 | |
1218 invalid: | |
1219 | |
1220 /* unlock name mutex */ | |
1221 | |
1222 ngx_log_error(r->log_level, r->log, 0, err); | |
1223 | |
1224 return; | |
1225 | |
1226 failed: | |
1227 | |
1228 /* unlock name mutex */ | |
1229 | |
1230 return; | |
1231 } | |
1232 | |
1233 | |
1234 static void | |
1235 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
|
1236 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan) |
1649 | 1237 { |
1238 char *err; | |
1239 size_t len; | |
1240 in_addr_t addr; | |
1241 ngx_int_t digit; | |
1242 ngx_str_t name; | |
1243 ngx_uint_t i, mask, qtype, qclass, qident; | |
1244 ngx_resolver_an_t *an; | |
1245 ngx_resolver_ctx_t *ctx, *next; | |
1246 ngx_resolver_node_t *rn; | |
1247 | |
1248 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) { | |
1249 goto invalid_in_addr_arpa; | |
1250 } | |
1251 | |
1252 addr = 0; | |
1253 i = 12; | |
1254 | |
1255 for (mask = 0; mask < 32; mask += 8) { | |
1256 len = buf[i++]; | |
1257 | |
1258 digit = ngx_atoi(&buf[i], len); | |
1259 if (digit == NGX_ERROR || digit > 255) { | |
1260 goto invalid_in_addr_arpa; | |
1261 } | |
1262 | |
1263 addr += digit << mask; | |
1264 i += len; | |
1265 } | |
1266 | |
1267 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) { | |
1268 goto invalid_in_addr_arpa; | |
1269 } | |
1270 | |
1271 /* lock addr mutex */ | |
1272 | |
1273 rn = ngx_resolver_lookup_addr(r, addr); | |
1274 | |
1275 if (rn == NULL || rn->query == NULL) { | |
1276 ngx_log_error(r->log_level, r->log, 0, | |
1277 "unexpected response for %ud.%ud.%ud.%ud", | |
1278 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
1279 (addr >> 8) & 0xff, addr & 0xff); | |
1280 goto failed; | |
1281 } | |
1282 | |
1283 qident = (rn->query[0] << 8) + rn->query[1]; | |
1284 | |
1285 if (ident != qident) { | |
1286 ngx_log_error(r->log_level, r->log, 0, | |
1287 "wrong ident %d response for %ud.%ud.%ud.%ud, expect %d", | |
1288 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
1289 (addr >> 8) & 0xff, addr & 0xff, qident); | |
1290 goto failed; | |
1291 } | |
1292 | |
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1293 if (code == 0 && nan == 0) { |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1294 code = 3; /* NXDOMAIN */ |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1295 } |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1296 |
1649 | 1297 if (code) { |
1298 next = rn->waiting; | |
1299 rn->waiting = NULL; | |
1300 | |
1301 ngx_queue_remove(&rn->queue); | |
1302 | |
1303 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
1304 | |
1305 ngx_resolver_free_node(r, rn); | |
1306 | |
1307 /* unlock addr mutex */ | |
1308 | |
1309 while (next) { | |
1310 ctx = next; | |
1311 ctx->state = code; | |
1312 next = ctx->next; | |
1313 | |
1314 ctx->handler(ctx); | |
1315 } | |
1316 | |
1317 return; | |
1318 } | |
1319 | |
1320 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t); | |
1321 | |
1322 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) { | |
1323 goto short_response; | |
1324 } | |
1325 | |
1326 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */ | |
1327 | |
1328 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) { | |
1329 err = "invalid in-addr.arpa name in DNS response"; | |
1330 goto invalid; | |
1331 } | |
1332 | |
1333 an = (ngx_resolver_an_t *) &buf[i + 2]; | |
1334 | |
1335 qtype = (an->type_hi << 8) + an->type_lo; | |
1336 qclass = (an->class_hi << 8) + an->class_lo; | |
1337 len = (an->len_hi << 8) + an->len_lo; | |
1338 | |
1339 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1340 "resolver qt:%d cl:%d len:%uz", qtype, qclass, len); | |
1341 | |
1342 i += 2 + sizeof(ngx_resolver_an_t); | |
1343 | |
1344 if (i + len > (ngx_uint_t) n) { | |
1345 goto short_response; | |
1346 } | |
1347 | |
1348 len -= 2; | |
1349 | |
1350 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) { | |
1351 return; | |
1352 } | |
1353 | |
1354 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name); | |
1355 | |
1356 if (len != (size_t) rn->nlen || ngx_strncmp(name.data, rn->name, len) != 0) | |
1357 { | |
1358 ngx_resolver_free(r, rn->name); | |
1359 rn->name = name.data; | |
1360 | |
1361 name.data = ngx_resolver_dup(r, rn->name, len); | |
1362 if (name.data == NULL) { | |
1363 goto failed; | |
1364 } | |
1365 } | |
1366 | |
1367 ngx_queue_remove(&rn->queue); | |
1368 | |
1369 rn->valid = ngx_time() + r->valid; | |
1370 rn->expire = ngx_time() + r->expire; | |
1371 | |
1372 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
1373 | |
1374 next = rn->waiting; | |
1375 rn->waiting = NULL; | |
1376 | |
1377 /* unlock addr mutex */ | |
1378 | |
1379 while (next) { | |
1380 ctx = next; | |
1381 ctx->state = NGX_OK; | |
1382 ctx->name = name; | |
1383 next = ctx->next; | |
1384 | |
1385 ctx->handler(ctx); | |
1386 } | |
1387 | |
1388 ngx_resolver_free(r, name.data); | |
1389 | |
1390 return; | |
1391 | |
1392 invalid_in_addr_arpa: | |
1393 | |
1394 ngx_log_error(r->log_level, r->log, 0, | |
1395 "invalid in-addr.arpa name in DNS response"); | |
1396 return; | |
1397 | |
1398 short_response: | |
1399 | |
1400 err = "short DNS response"; | |
1401 | |
1402 invalid: | |
1403 | |
1404 /* unlock addr mutex */ | |
1405 | |
1406 ngx_log_error(r->log_level, r->log, 0, err); | |
1407 | |
1408 return; | |
1409 | |
1410 failed: | |
1411 | |
1412 /* unlock addr mutex */ | |
1413 | |
1414 return; | |
1415 } | |
1416 | |
1417 | |
1418 static ngx_resolver_node_t * | |
1419 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) | |
1420 { | |
1421 ngx_int_t rc; | |
1422 size_t len; | |
1423 ngx_rbtree_node_t *node, *sentinel; | |
1424 ngx_resolver_node_t *rn; | |
1425 | |
1426 node = r->name_rbtree.root; | |
1427 sentinel = r->name_rbtree.sentinel; | |
1428 | |
1429 while (node != sentinel) { | |
1430 | |
1431 if (hash < node->key) { | |
1432 node = node->left; | |
1433 continue; | |
1434 } | |
1435 | |
1436 if (hash > node->key) { | |
1437 node = node->right; | |
1438 continue; | |
1439 } | |
1440 | |
1441 /* hash == node->key */ | |
1442 | |
1443 do { | |
1444 rn = (ngx_resolver_node_t *) node; | |
1445 | |
1446 len = (name->len > (size_t) rn->nlen) ? rn->nlen : name->len; | |
1447 | |
1448 rc = ngx_strncmp(name->data, rn->name, len); | |
1449 | |
1450 if (rc == 0) { | |
1451 return rn; | |
1452 } | |
1453 | |
1454 node = (rc < 0) ? node->left : node->right; | |
1455 | |
1456 } while (node != sentinel && hash == node->key); | |
1457 | |
1458 break; | |
1459 } | |
1460 | |
1461 /* not found */ | |
1462 | |
1463 return NULL; | |
1464 } | |
1465 | |
1466 | |
1467 static ngx_resolver_node_t * | |
1468 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr) | |
1469 { | |
1470 ngx_rbtree_node_t *node, *sentinel; | |
1471 | |
1472 node = r->addr_rbtree.root; | |
1473 sentinel = r->addr_rbtree.sentinel; | |
1474 | |
1475 while (node != sentinel) { | |
1476 | |
1477 if (addr < node->key) { | |
1478 node = node->left; | |
1479 continue; | |
1480 } | |
1481 | |
1482 if (addr > node->key) { | |
1483 node = node->right; | |
1484 continue; | |
1485 } | |
1486 | |
1487 /* addr == node->key */ | |
1488 | |
1489 return (ngx_resolver_node_t *) node; | |
1490 } | |
1491 | |
1492 /* not found */ | |
1493 | |
1494 return NULL; | |
1495 } | |
1496 | |
1497 | |
1498 static void | |
1499 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
1500 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
1501 { | |
1502 size_t len; | |
1503 ngx_rbtree_node_t **p; | |
1504 ngx_resolver_node_t *rn, *rn_temp; | |
1505 | |
1506 for ( ;; ) { | |
1507 | |
1508 if (node->key < temp->key) { | |
1509 | |
1510 p = &temp->left; | |
1511 | |
1512 } else if (node->key > temp->key) { | |
1513 | |
1514 p = &temp->right; | |
1515 | |
1516 } else { /* node->key == temp->key */ | |
1517 | |
1518 rn = (ngx_resolver_node_t *) node; | |
1519 rn_temp = (ngx_resolver_node_t *) temp; | |
1520 | |
1521 len = (rn->nlen > rn_temp->nlen) ? rn_temp->nlen : rn->nlen; | |
1522 | |
1523 p = (ngx_strncmp(rn->name, rn_temp->name, len) < 0) | |
1524 ? &temp->left : &temp->right; | |
1525 } | |
1526 | |
1527 if (*p == sentinel) { | |
1528 break; | |
1529 } | |
1530 | |
1531 temp = *p; | |
1532 } | |
1533 | |
1534 *p = node; | |
1535 node->parent = temp; | |
1536 node->left = sentinel; | |
1537 node->right = sentinel; | |
1538 ngx_rbt_red(node); | |
1539 } | |
1540 | |
1541 | |
1542 static ngx_int_t | |
1543 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
1544 { | |
1545 u_char *p, *s; | |
1546 size_t len; | |
1547 ngx_uint_t ident; | |
1548 ngx_resolver_qs_t *qs; | |
1549 ngx_resolver_query_t *query; | |
1550 | |
1551 len = sizeof(ngx_resolver_query_t) | |
1552 + 1 + ctx->name.len + 1 + sizeof(ngx_resolver_qs_t); | |
1553 | |
1554 p = ngx_resolver_calloc(ctx->resolver, len); | |
1555 if (p == NULL) { | |
1556 return NGX_ERROR; | |
1557 } | |
1558 | |
1559 rn->qlen = (u_short) len; | |
1560 rn->query = p; | |
1561 | |
1562 query = (ngx_resolver_query_t *) p; | |
1563 | |
1564 ident = ngx_random(); | |
1565 | |
1566 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0, | |
1567 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff); | |
1568 | |
1569 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
1570 query->ident_lo = (u_char) (ident & 0xff); | |
1571 | |
1572 /* recursion query */ | |
1573 query->flags_hi = 1; query->flags_lo = 0; | |
1574 | |
1575 /* one question */ | |
1576 query->nqs_hi = 0; query->nqs_lo = 1; | |
1577 query->nan_hi = 0; query->nan_lo = 0; | |
1578 query->nns_hi = 0; query->nns_lo = 0; | |
1579 query->nar_hi = 0; query->nar_lo = 0; | |
1580 | |
1581 p += sizeof(ngx_resolver_query_t) + 1 + ctx->name.len + 1; | |
1582 | |
1583 qs = (ngx_resolver_qs_t *) p; | |
1584 | |
1585 /* query type */ | |
1586 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type; | |
1587 | |
1588 /* IP query class */ | |
1589 qs->class_hi = 0; qs->class_lo = 1; | |
1590 | |
1591 /* convert "www.example.com" to "\3www\7example\3com\0" */ | |
1592 | |
1593 len = 0; | |
1594 p--; | |
1595 *p-- = '\0'; | |
1596 | |
1597 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) { | |
1598 if (*s != '.') { | |
1599 *p = *s; | |
1600 len++; | |
1601 | |
1602 } else { | |
1603 *p = (u_char) len; | |
1604 len = 0; | |
1605 } | |
1606 | |
1607 p--; | |
1608 } | |
1609 | |
1610 *p = (u_char) len; | |
1611 | |
1612 return NGX_OK; | |
1613 } | |
1614 | |
1615 | |
1616 /* AF_INET only */ | |
1617 | |
1618 static ngx_int_t | |
1619 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
1620 { | |
1621 u_char *p, *d; | |
1622 size_t len; | |
1623 ngx_int_t n; | |
1624 ngx_uint_t ident; | |
1625 ngx_resolver_query_t *query; | |
1626 | |
1627 len = sizeof(ngx_resolver_query_t) | |
1628 + sizeof(".255.255.255.255.in-addr.arpa.") - 1 | |
1629 + sizeof(ngx_resolver_qs_t); | |
1630 | |
1631 p = ngx_resolver_calloc(ctx->resolver, len); | |
1632 if (p == NULL) { | |
1633 return NGX_ERROR; | |
1634 } | |
1635 | |
1636 rn->query = p; | |
1637 query = (ngx_resolver_query_t *) p; | |
1638 | |
1639 ident = ngx_random(); | |
1640 | |
1641 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
1642 query->ident_lo = (u_char) (ident & 0xff); | |
1643 | |
1644 /* recursion query */ | |
1645 query->flags_hi = 1; query->flags_lo = 0; | |
1646 | |
1647 /* one question */ | |
1648 query->nqs_hi = 0; query->nqs_lo = 1; | |
1649 query->nan_hi = 0; query->nan_lo = 0; | |
1650 query->nns_hi = 0; query->nns_lo = 0; | |
1651 query->nar_hi = 0; query->nar_lo = 0; | |
1652 | |
1653 p += sizeof(ngx_resolver_query_t); | |
1654 | |
1655 for (n = 0; n < 32; n += 8){ | |
1656 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff); | |
1657 *p = (u_char) (d - &p[1]); | |
1658 p = d; | |
1659 } | |
1660 | |
1661 /* query type "PTR", IP query class */ | |
1662 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18); | |
1663 | |
1664 rn->qlen = (u_short) | |
1665 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t) | |
1666 - rn->query); | |
1667 | |
1668 return NGX_OK; | |
1669 } | |
1670 | |
1671 | |
1672 static ngx_int_t | |
1673 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src, | |
1674 u_char *last) | |
1675 { | |
1676 char *err; | |
1677 u_char *p, *dst; | |
1678 ssize_t len; | |
1679 ngx_uint_t i, n; | |
1680 | |
1681 p = src; | |
1682 len = -1; | |
1683 | |
1684 /* | |
1685 * compression pointers allow to create endless loop, so we set limit; | |
1686 * 128 pointers should be enough to store 255-byte name | |
1687 */ | |
1688 | |
1689 for (i = 0; i < 128; i++) { | |
1690 n = *p++; | |
1691 | |
1692 if (n == 0) { | |
1693 goto done; | |
1694 } | |
1695 | |
1696 if (n & 0xc0) { | |
1697 n = (n & 0x3f << 8) + *p; | |
1698 p = &buf[n]; | |
1699 | |
1700 } else { | |
1701 len += 1 + n; | |
1702 p = &p[n]; | |
1703 } | |
1704 | |
1705 if (p >= last) { | |
1706 err = "name is out of response"; | |
1707 goto invalid; | |
1708 } | |
1709 } | |
1710 | |
1711 err = "compression pointers loop"; | |
1712 | |
1713 invalid: | |
1714 | |
1715 ngx_log_error(r->log_level, r->log, 0, err); | |
1716 | |
1717 return NGX_ERROR; | |
1718 | |
1719 done: | |
1720 | |
1721 if (name == NULL) { | |
583 | 1722 return NGX_OK; |
1723 } | |
1724 | |
1649 | 1725 dst = ngx_resolver_alloc(r, len); |
1726 if (dst == NULL) { | |
1727 return NGX_ERROR; | |
1728 } | |
1729 | |
1730 name->data = dst; | |
1731 | |
1732 n = *src++; | |
1733 | |
1734 for ( ;; ) { | |
1735 if (n != 0xc0) { | |
1736 ngx_memcpy(dst, src, n); | |
1737 dst += n; | |
1738 src += n; | |
1739 | |
1740 n = *src++; | |
1741 | |
1742 if (n != 0) { | |
1743 *dst++ = '.'; | |
1744 } | |
1745 | |
1746 } else { | |
1747 n = (n & 0x3f << 8) + *src; | |
1748 src = &buf[n]; | |
1749 | |
1750 n = *src++; | |
1751 } | |
1752 | |
1753 if (n == 0) { | |
1754 name->len = dst - name->data; | |
1755 return NGX_OK; | |
1756 } | |
1757 } | |
1758 } | |
1759 | |
1760 | |
1761 static void | |
1762 ngx_resolver_timeout_handler(ngx_event_t *ev) | |
1763 { | |
1764 ngx_resolver_ctx_t *ctx; | |
1765 | |
1766 ctx = ev->data; | |
1767 | |
1768 ctx->state = NGX_RESOLVE_TIMEDOUT; | |
1769 | |
1770 ctx->handler(ctx); | |
1771 } | |
1772 | |
1773 | |
1774 static void | |
1775 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
1776 { | |
1777 /* lock alloc mutex */ | |
1778 | |
1779 if (rn->query) { | |
1780 ngx_resolver_free_locked(r, rn->query); | |
1781 } | |
1782 | |
1783 if (rn->name) { | |
1784 ngx_resolver_free_locked(r, rn->name); | |
1785 } | |
1786 | |
1787 if (rn->cnlen) { | |
1788 ngx_resolver_free_locked(r, rn->u.cname); | |
1789 } | |
1790 | |
1791 if (rn->naddrs > 1) { | |
1792 ngx_resolver_free_locked(r, rn->u.addrs); | |
1793 } | |
1794 | |
1795 ngx_resolver_free_locked(r, rn); | |
1796 | |
1797 /* unlock alloc mutex */ | |
1798 } | |
1799 | |
1800 | |
1801 static void * | |
1802 ngx_resolver_alloc(ngx_resolver_t *r, size_t size) | |
1803 { | |
1804 u_char *p; | |
1805 | |
1806 /* lock alloc mutex */ | |
1807 | |
1808 p = ngx_alloc(size, r->log); | |
1809 | |
1810 /* unlock alloc mutex */ | |
1811 | |
1812 return p; | |
1813 } | |
1814 | |
1815 | |
1816 void * | |
1817 ngx_resolver_calloc(ngx_resolver_t *r, size_t size) | |
1818 { | |
1819 u_char *p; | |
1820 | |
1821 p = ngx_resolver_alloc(r, size); | |
1822 | |
1823 if (p) { | |
1824 ngx_memzero(p, size); | |
1825 } | |
1826 | |
1827 return p; | |
1828 } | |
1829 | |
1830 | |
1831 static void | |
1832 ngx_resolver_free(ngx_resolver_t *r, void *p) | |
1833 { | |
1834 /* lock alloc mutex */ | |
1835 | |
1836 ngx_free(p); | |
1837 | |
1838 /* unlock alloc mutex */ | |
1839 } | |
1840 | |
1841 | |
1842 static void | |
1843 ngx_resolver_free_locked(ngx_resolver_t *r, void *p) | |
1844 { | |
1845 ngx_free(p); | |
1846 } | |
1847 | |
1848 | |
1849 static void * | |
1850 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size) | |
1851 { | |
1852 void *dst; | |
1853 | |
1854 dst = ngx_resolver_alloc(r, size); | |
1855 | |
1856 if (dst == NULL) { | |
1857 return dst; | |
1858 } | |
1859 | |
1860 ngx_memcpy(dst, src, size); | |
1861 | |
1862 return dst; | |
1863 } | |
1864 | |
1865 | |
1866 char * | |
1867 ngx_resolver_strerror(ngx_int_t err) | |
1868 { | |
1869 static char *errors[] = { | |
1870 "Format error", /* FORMERR */ | |
1871 "Server failure", /* SERVFAIL */ | |
1872 "Host not found", /* NXDOMAIN */ | |
1873 "Unimplemented", /* NOTIMP */ | |
1874 "Operation refused" /* REFUSED */ | |
1875 }; | |
1876 | |
1877 if (err > 0 && err < 6) { | |
1878 return errors[err - 1]; | |
1879 } | |
1880 | |
1881 if (err == NGX_RESOLVE_TIMEDOUT) { | |
1882 return "Operation timed out"; | |
1883 } | |
1884 | |
1885 return "Unknown error"; | |
1886 } | |
1887 | |
1888 | |
1889 ngx_int_t | |
1890 ngx_udp_connect(ngx_udp_connection_t *uc) | |
1891 { | |
1892 int rc; | |
1893 ngx_int_t event; | |
1894 ngx_event_t *rev, *wev; | |
1895 ngx_socket_t s; | |
1896 ngx_connection_t *c; | |
1897 | |
583 | 1898 s = ngx_socket(AF_INET, SOCK_DGRAM, 0); |
1899 | |
1649 | 1900 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, uc->log, 0, "UDP socket %d", s); |
583 | 1901 |
1902 if (s == -1) { | |
1649 | 1903 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
583 | 1904 ngx_socket_n " failed"); |
1905 return NGX_ERROR; | |
1906 } | |
1907 | |
1649 | 1908 c = ngx_get_connection(s, uc->log); |
583 | 1909 |
1910 if (c == NULL) { | |
1911 if (ngx_close_socket(s) == -1) { | |
1649 | 1912 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
583 | 1913 ngx_close_socket_n "failed"); |
1914 } | |
1915 | |
1916 return NGX_ERROR; | |
1917 } | |
1918 | |
1649 | 1919 if (ngx_nonblocking(s) == -1) { |
1920 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
1921 ngx_nonblocking_n " failed"); | |
1922 | |
1923 ngx_free_connection(c); | |
1924 | |
1925 if (ngx_close_socket(s) == -1) { | |
1926 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
1927 ngx_close_socket_n " failed"); | |
1928 } | |
1929 | |
1930 return NGX_ERROR; | |
1931 } | |
1932 | |
583 | 1933 rev = c->read; |
1934 wev = c->write; | |
1935 | |
1649 | 1936 rev->log = uc->log; |
1937 wev->log = uc->log; | |
1938 | |
1939 uc->connection = c; | |
583 | 1940 |
1941 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); | |
1942 | |
1943 #if (NGX_THREADS) | |
1649 | 1944 |
1945 /* TODO: lock event when call completion handler */ | |
1946 | |
1947 rev->lock = &c->lock; | |
1948 wev->lock = &c->lock; | |
583 | 1949 rev->own_lock = &c->lock; |
1950 wev->own_lock = &c->lock; | |
1649 | 1951 |
583 | 1952 #endif |
1953 | |
1649 | 1954 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, uc->log, 0, |
1955 "connect to %V, fd:%d #%d", &uc->server, s, c->number); | |
1956 | |
1957 rc = connect(s, uc->sockaddr, uc->socklen); | |
1958 | |
1959 /* TODO: aio, iocp */ | |
583 | 1960 |
1961 if (rc == -1) { | |
1649 | 1962 ngx_log_error(NGX_LOG_CRIT, uc->log, ngx_socket_errno, |
1963 "connect() to %V failed", &uc->server); | |
583 | 1964 |
1965 return NGX_ERROR; | |
1966 } | |
1967 | |
1649 | 1968 /* UDP sockets are always ready to write */ |
1969 wev->ready = 1; | |
1970 | |
1971 if (ngx_add_event) { | |
1972 | |
1973 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ? | |
1974 /* kqueue, epoll */ NGX_CLEAR_EVENT: | |
1975 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT; | |
1976 /* eventport event type has no meaning: oneshot only */ | |
1977 | |
1978 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { | |
1979 return NGX_ERROR; | |
1980 } | |
1981 | |
1982 } else { | |
1983 /* rtsig */ | |
1984 | |
583 | 1985 if (ngx_add_conn(c) == NGX_ERROR) { |
1986 return NGX_ERROR; | |
1987 } | |
1988 } | |
1989 | |
1990 return NGX_OK; | |
1991 } |