Mercurial > hg > nginx
annotate src/core/ngx_resolver.c @ 1965:14463ae77723
take into account DNAME
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Thu, 10 Apr 2008 17:12:21 +0000 |
parents | 99b9feacccb4 |
children | fb02f63eafd6 |
rev | line source |
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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, | |
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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) { | |
205 next = ctx->next; | |
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 | |
438 ctx->name.len = rn->cnlen; | |
439 ctx->name.data = rn->u.cname; | |
440 | |
441 return ngx_resolve_name_locked(r, ctx); | |
442 } | |
443 | |
444 if (rn->waiting) { | |
445 | |
446 ctx->next = rn->waiting; | |
447 rn->waiting = ctx; | |
448 | |
449 return NGX_AGAIN; | |
450 } | |
451 | |
452 ngx_queue_remove(&rn->queue); | |
453 | |
454 /* lock alloc mutex */ | |
455 | |
456 ngx_resolver_free_locked(r, rn->query); | |
1960
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diff
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|
457 rn->query = NULL; |
1649 | 458 |
459 if (rn->cnlen) { | |
460 ngx_resolver_free_locked(r, rn->u.cname); | |
461 } | |
462 | |
463 if (rn->naddrs > 1) { | |
464 ngx_resolver_free_locked(r, rn->u.addrs); | |
465 } | |
466 | |
467 /* unlock alloc mutex */ | |
468 | |
469 } else { | |
470 | |
471 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
472 if (rn == NULL) { | |
473 return NGX_ERROR; | |
474 } | |
475 | |
476 rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len); | |
477 if (rn->name == NULL) { | |
478 ngx_resolver_free(r, rn); | |
479 return NGX_ERROR; | |
480 } | |
481 | |
482 rn->node.key = hash; | |
483 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
|
484 rn->query = NULL; |
1649 | 485 |
486 ngx_rbtree_insert(&r->name_rbtree, &rn->node); | |
487 } | |
488 | |
1961
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return NXDOMAIN for ".." in host name
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1960
diff
changeset
|
489 rc = ngx_resolver_create_name_query(rn, ctx); |
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
490 |
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
491 if (rc == NGX_ERROR) { |
1649 | 492 goto failed; |
493 } | |
494 | |
1961
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parents:
1960
diff
changeset
|
495 if (rc == NGX_DECLINED) { |
99b9feacccb4
return NXDOMAIN for ".." in host name
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1960
diff
changeset
|
496 ngx_rbtree_delete(&r->name_rbtree, &rn->node); |
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
497 |
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
498 ngx_resolver_free(r, rn->query); |
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return NXDOMAIN for ".." in host name
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1960
diff
changeset
|
499 ngx_resolver_free(r, rn->name); |
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
500 ngx_resolver_free(r, rn); |
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
501 |
99b9feacccb4
return NXDOMAIN for ".." in host name
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1960
diff
changeset
|
502 ctx->state = NGX_RESOLVE_NXDOMAIN; |
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diff
changeset
|
503 ctx->handler(ctx); |
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return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
504 |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
505 return NGX_OK; |
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
506 } |
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
507 |
1649 | 508 if (ngx_resolver_send_query(r, rn) != NGX_OK) { |
509 goto failed; | |
510 } | |
511 | |
512 if (ctx->event == NULL) { | |
513 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
514 if (ctx->event == NULL) { | |
515 goto failed; | |
516 } | |
517 | |
518 ctx->event->handler = ngx_resolver_timeout_handler; | |
519 ctx->event->data = ctx; | |
520 ctx->event->log = r->log; | |
521 ctx->ident = -1; | |
522 | |
523 ngx_add_timer(ctx->event, ctx->timeout); | |
524 } | |
525 | |
526 if (ngx_queue_empty(&r->name_resend_queue)) { | |
527 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
528 } | |
529 | |
530 rn->expire = ngx_time() + r->resend_timeout; | |
531 | |
532 ngx_queue_insert_head(&r->name_resend_queue, &rn->queue); | |
533 | |
534 rn->cnlen = 0; | |
535 rn->naddrs = 0; | |
536 rn->valid = 0; | |
537 rn->waiting = ctx; | |
538 | |
539 ctx->state = NGX_AGAIN; | |
540 | |
541 return NGX_AGAIN; | |
542 | |
543 failed: | |
544 | |
545 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
546 | |
1960
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fix memory leak on resolver query send failure
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parents:
1914
diff
changeset
|
547 if (rn->query) { |
1609b3c3d604
fix memory leak on resolver query send failure
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parents:
1914
diff
changeset
|
548 ngx_resolver_free(r, rn->query); |
1609b3c3d604
fix memory leak on resolver query send failure
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diff
changeset
|
549 } |
1609b3c3d604
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diff
changeset
|
550 |
1649 | 551 ngx_resolver_free(r, rn->name); |
552 | |
553 ngx_resolver_free(r, rn); | |
554 | |
555 return NGX_ERROR; | |
556 } | |
583 | 557 |
558 | |
559 ngx_int_t | |
1649 | 560 ngx_resolve_addr(ngx_resolver_ctx_t *ctx) |
561 { | |
562 ngx_resolver_t *r; | |
563 ngx_resolver_node_t *rn; | |
564 | |
565 r = ctx->resolver; | |
566 | |
567 ctx->addr = ntohl(ctx->addr); | |
568 | |
569 /* lock addr mutex */ | |
570 | |
571 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
572 | |
573 if (rn) { | |
574 | |
575 if (rn->valid >= ngx_time()) { | |
576 | |
577 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
578 | |
579 ngx_queue_remove(&rn->queue); | |
580 | |
581 rn->expire = ngx_time() + r->expire; | |
582 | |
583 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
584 | |
585 ctx->name.len = rn->nlen; | |
586 ctx->name.data = ngx_resolver_dup(r, rn->name, rn->nlen); | |
587 if (ctx->name.data == NULL) { | |
588 goto failed; | |
589 } | |
590 | |
591 /* unlock addr mutex */ | |
592 | |
593 ctx->state = NGX_OK; | |
594 | |
595 ctx->handler(ctx); | |
596 | |
597 ngx_resolver_free(r, ctx->name.data); | |
598 | |
599 return NGX_OK; | |
600 } | |
601 | |
602 if (rn->waiting) { | |
603 | |
604 ctx->next = rn->waiting; | |
605 rn->waiting = ctx; | |
606 | |
607 return NGX_AGAIN; | |
608 } | |
609 | |
610 ngx_queue_remove(&rn->queue); | |
611 | |
612 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
|
613 rn->query = NULL; |
1649 | 614 |
615 } else { | |
616 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
617 if (rn == NULL) { | |
618 goto failed; | |
619 } | |
620 | |
621 rn->node.key = ctx->addr; | |
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
622 rn->query = NULL; |
1649 | 623 |
624 ngx_rbtree_insert(&r->addr_rbtree, &rn->node); | |
625 } | |
626 | |
627 if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) { | |
628 goto failed; | |
629 } | |
630 | |
631 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
632 goto failed; | |
633 } | |
634 | |
635 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
636 if (ctx->event == NULL) { | |
637 goto failed; | |
638 } | |
639 | |
640 ctx->event->handler = ngx_resolver_timeout_handler; | |
641 ctx->event->data = ctx; | |
642 ctx->event->log = r->log; | |
643 ctx->ident = -1; | |
644 | |
645 ngx_add_timer(ctx->event, ctx->timeout); | |
646 | |
647 if (ngx_queue_empty(&r->addr_resend_queue)) { | |
648 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
649 } | |
650 | |
651 rn->expire = ngx_time() + r->resend_timeout; | |
652 | |
653 ngx_queue_insert_head(&r->addr_resend_queue, &rn->queue); | |
654 | |
655 rn->cnlen = 0; | |
656 rn->naddrs = 0; | |
657 rn->name = NULL; | |
658 rn->nlen = 0; | |
659 rn->valid = 0; | |
660 rn->waiting = ctx; | |
661 | |
662 /* unlock addr mutex */ | |
663 | |
664 ctx->state = NGX_AGAIN; | |
665 | |
666 return NGX_OK; | |
667 | |
668 failed: | |
669 | |
670 if (rn) { | |
671 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
672 | |
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
673 if (rn->query) { |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
674 ngx_resolver_free(r, rn->query); |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
675 } |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
676 |
1649 | 677 ngx_resolver_free(r, rn); |
678 } | |
679 | |
680 /* unlock addr mutex */ | |
681 | |
682 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
|
683 ngx_resolver_free(r, ctx->event); |
1649 | 684 } |
685 | |
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
686 ngx_resolver_free(r, ctx); |
1649 | 687 |
688 return NGX_ERROR; | |
689 } | |
690 | |
691 | |
692 void | |
693 ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx) | |
694 { | |
695 in_addr_t addr; | |
696 ngx_resolver_t *r; | |
697 ngx_resolver_ctx_t *w, **p; | |
698 ngx_resolver_node_t *rn; | |
699 | |
700 r = ctx->resolver; | |
701 | |
702 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
703 "resolve addr done: %i", ctx->state); | |
704 | |
705 if (ctx->event && ctx->event->timer_set) { | |
706 ngx_del_timer(ctx->event); | |
707 } | |
708 | |
709 /* lock addr mutex */ | |
710 | |
711 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
712 | |
713 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
714 | |
715 if (rn) { | |
716 p = &rn->waiting; | |
717 w = rn->waiting; | |
718 | |
719 while (w) { | |
720 if (w == ctx) { | |
721 *p = w->next; | |
722 | |
723 goto done; | |
724 } | |
725 | |
726 p = &w->next; | |
727 w = w->next; | |
728 } | |
729 } | |
730 | |
731 addr = ntohl(ctx->addr); | |
732 | |
733 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
734 "could not cancel %ud.%ud.%ud.%ud resolving", | |
735 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
736 (addr >> 8) & 0xff, addr & 0xff); | |
737 } | |
738 | |
739 done: | |
740 | |
741 ngx_resolver_expire(r, &r->addr_rbtree, &r->addr_expire_queue); | |
742 | |
743 /* unlock addr mutex */ | |
744 | |
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
745 /* 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
|
746 |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
747 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
|
748 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
|
749 } |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
750 |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
751 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
|
752 |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
753 /* unlock alloc mutex */ |
1649 | 754 } |
755 | |
756 | |
757 static void | |
758 ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
759 { | |
760 time_t now; | |
761 ngx_uint_t i; | |
762 ngx_queue_t *q; | |
763 ngx_resolver_node_t *rn; | |
764 | |
765 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire"); | |
766 | |
767 now = ngx_time(); | |
768 | |
769 for (i = 0; i < 2; i++) { | |
770 if (ngx_queue_empty(queue)) { | |
771 return; | |
772 } | |
773 | |
774 q = ngx_queue_last(queue); | |
775 | |
776 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
777 | |
778 if (now <= rn->expire) { | |
779 return; | |
780 } | |
781 | |
1774 | 782 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, |
783 "resolver expire \"%*s\"", (size_t) rn->nlen, rn->name); | |
1649 | 784 |
785 ngx_queue_remove(q); | |
786 | |
787 ngx_rbtree_delete(tree, &rn->node); | |
788 | |
789 ngx_resolver_free_node(r, rn); | |
790 } | |
791 } | |
792 | |
793 | |
794 static ngx_int_t | |
795 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
796 { | |
797 ssize_t n; | |
798 ngx_udp_connection_t *uc; | |
799 | |
800 uc = r->udp_connection; | |
801 | |
802 if (uc->connection == NULL) { | |
803 if (ngx_udp_connect(uc) != NGX_OK) { | |
804 return NGX_ERROR; | |
805 } | |
806 | |
807 uc->connection->data = r; | |
808 uc->connection->read->handler = ngx_resolver_read_response; | |
1906 | 809 uc->connection->read->resolver = 1; |
1649 | 810 } |
811 | |
812 n = ngx_send(uc->connection, rn->query, rn->qlen); | |
813 | |
814 if (n == -1) { | |
815 return NGX_ERROR; | |
816 } | |
817 | |
818 if ((size_t) n != (size_t) rn->qlen) { | |
819 ngx_log_error(NGX_LOG_CRIT, uc->log, 0, "send() incomplete"); | |
820 return NGX_ERROR; | |
821 } | |
822 | |
823 return NGX_OK; | |
824 } | |
825 | |
826 | |
827 static void | |
828 ngx_resolver_resend_handler(ngx_event_t *ev) | |
829 { | |
830 time_t timer, atimer, ntimer; | |
831 ngx_resolver_t *r; | |
832 | |
833 r = ev->data; | |
834 | |
835 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, | |
836 "resolver resend handler"); | |
837 | |
838 /* lock name mutex */ | |
839 | |
840 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue); | |
841 | |
842 /* unlock name mutex */ | |
843 | |
844 /* lock addr mutex */ | |
845 | |
846 atimer = ngx_resolver_resend(r, &r->addr_rbtree, &r->addr_resend_queue); | |
1679
ca317d9b5c09
style fix: remove trailing spaces
Igor Sysoev <igor@sysoev.ru>
parents:
1649
diff
changeset
|
847 |
1649 | 848 /* unlock addr mutex */ |
849 | |
850 if (ntimer == 0) { | |
851 timer = atimer; | |
852 | |
853 } else if (atimer == 0) { | |
854 timer = ntimer; | |
855 | |
856 } else { | |
857 timer = (atimer < ntimer) ? atimer : ntimer; | |
858 } | |
859 | |
860 if (timer) { | |
861 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000)); | |
862 } | |
863 } | |
864 | |
865 | |
866 static time_t | |
867 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
868 { | |
869 time_t now; | |
870 ngx_queue_t *q; | |
871 ngx_resolver_node_t *rn; | |
872 | |
873 now = ngx_time(); | |
874 | |
875 for ( ;; ) { | |
876 if (ngx_queue_empty(queue)) { | |
877 return 0; | |
878 } | |
879 | |
880 q = ngx_queue_last(queue); | |
881 | |
882 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
883 | |
884 if (now < rn->expire) { | |
885 return rn->expire - now; | |
886 } | |
887 | |
1774 | 888 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, |
889 "resolver resend \"%*s\" %p", | |
890 (size_t) rn->nlen, rn->name, rn->waiting); | |
1649 | 891 |
892 ngx_queue_remove(q); | |
893 | |
894 if (rn->waiting) { | |
895 | |
896 if (ngx_resolver_send_query(r, rn) == NGX_OK) { | |
897 | |
898 rn->expire = now + r->resend_timeout; | |
899 | |
900 ngx_queue_insert_head(queue, &rn->queue); | |
901 } | |
1879
cf4ee321d195
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Igor Sysoev <igor@sysoev.ru>
parents:
1878
diff
changeset
|
902 |
cf4ee321d195
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Igor Sysoev <igor@sysoev.ru>
parents:
1878
diff
changeset
|
903 continue; |
1649 | 904 } |
905 | |
906 ngx_rbtree_delete(tree, &rn->node); | |
907 | |
908 ngx_resolver_free_node(r, rn); | |
909 } | |
910 } | |
911 | |
912 | |
913 static void | |
914 ngx_resolver_read_response(ngx_event_t *rev) | |
915 { | |
916 ssize_t n; | |
917 ngx_connection_t *c; | |
918 u_char buf[NGX_RESOLVER_UDP_SIZE]; | |
919 | |
920 c = rev->data; | |
921 | |
922 do { | |
1689 | 923 n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE); |
924 | |
925 if (n < 0) { | |
1649 | 926 return; |
927 } | |
928 | |
929 ngx_resolver_process_response(c->data, buf, n); | |
930 | |
931 } while (rev->ready); | |
932 } | |
933 | |
934 | |
935 static void | |
936 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n) | |
937 { | |
938 char *err; | |
939 size_t len; | |
940 ngx_uint_t i, ident, flags, code, nqs, nan, qtype, qclass; | |
941 ngx_resolver_qs_t *qs; | |
942 ngx_resolver_query_t *query; | |
943 | |
944 if ((size_t) n < sizeof(ngx_resolver_query_t) + 1) { | |
945 goto short_response; | |
946 } | |
947 | |
948 query = (ngx_resolver_query_t *) buf; | |
949 | |
950 ident = (query->ident_hi << 8) + query->ident_lo; | |
951 flags = (query->flags_hi << 8) + query->flags_lo; | |
952 nqs = (query->nqs_hi << 8) + query->nqs_lo; | |
953 nan = (query->nan_hi << 8) + query->nan_lo; | |
954 | |
955 ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0, | |
956 "resolver DNS response %d fl:%04Xud %d/%d/%d/%d", | |
957 ident, flags, nqs, nan, | |
958 (query->nns_hi << 8) + query->nns_lo, | |
959 (query->nar_hi << 8) + query->nar_lo); | |
960 | |
961 if (!(flags & 0x8000)) { | |
962 ngx_log_error(r->log_level, r->log, 0, | |
963 "invalid DNS response %d fl:%04Xud", ident, flags); | |
964 return; | |
965 } | |
966 | |
967 code = flags & 0x7f; | |
968 | |
969 if (code == NGX_RESOLVE_FORMERR || code > NGX_RESOLVE_REFUSED) { | |
970 ngx_log_error(r->log_level, r->log, 0, | |
971 "DNS error (%d: %s), query id:%d", | |
972 code, ngx_resolver_strerror(code), ident); | |
973 return; | |
974 } | |
975 | |
976 if (nqs != 1) { | |
977 err = "invalid number of questions in DNS response"; | |
978 goto done; | |
979 } | |
980 | |
981 i = sizeof(ngx_resolver_query_t); | |
982 | |
983 while (i < (ngx_uint_t) n) { | |
984 if (buf[i] == '\0') { | |
985 goto found; | |
986 } | |
987 | |
988 len = buf[i]; | |
989 i += 1 + len; | |
990 } | |
991 | |
992 goto short_response; | |
993 | |
994 found: | |
995 | |
996 if (i++ == 0) { | |
997 err = "zero-length domain name in DNS response"; | |
998 goto done; | |
999 } | |
1000 | |
1001 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t)) | |
1002 > (ngx_uint_t) n) | |
1003 { | |
1004 goto short_response; | |
1005 } | |
1006 | |
1007 qs = (ngx_resolver_qs_t *) &buf[i]; | |
1008 | |
1009 qtype = (qs->type_hi << 8) + qs->type_lo; | |
1010 qclass = (qs->class_hi << 8) + qs->class_lo; | |
1011 | |
1012 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1013 "resolver DNS response qt:%d cl:%d", qtype, qclass); | |
1014 | |
1015 if (qclass != 1) { | |
1016 ngx_log_error(r->log_level, r->log, 0, | |
1017 "unknown query class %d in DNS response", qclass); | |
1018 return; | |
1019 } | |
1020 | |
1021 switch (qtype) { | |
1022 | |
1023 case NGX_RESOLVE_A: | |
1024 | |
1025 ngx_resolver_process_a(r, buf, n, ident, code, nan, | |
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|
1026 i + sizeof(ngx_resolver_qs_t)); |
1649 | 1027 |
1028 break; | |
1029 | |
1030 case NGX_RESOLVE_PTR: | |
1031 | |
1742
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|
1032 ngx_resolver_process_ptr(r, buf, n, ident, code, nan); |
1649 | 1033 |
1034 break; | |
1035 | |
1036 default: | |
1037 ngx_log_error(r->log_level, r->log, 0, | |
1038 "unknown query type %d in DNS response", qtype); | |
1039 return; | |
1040 } | |
1041 | |
1042 return; | |
1043 | |
1044 short_response: | |
1045 | |
1046 err = "short dns response"; | |
1047 | |
1048 done: | |
1049 | |
1050 ngx_log_error(r->log_level, r->log, 0, err); | |
1051 | |
1052 return; | |
1053 } | |
1054 | |
1055 | |
1056 static void | |
1057 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last, | |
1058 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans) | |
583 | 1059 { |
1649 | 1060 char *err; |
1061 u_char *cname; | |
1062 size_t len; | |
1063 uint32_t hash; | |
1064 in_addr_t addr, *addrs; | |
1065 ngx_str_t name; | |
1066 ngx_uint_t qtype, qident, naddrs, a, i, n, start; | |
1067 ngx_resolver_an_t *an; | |
1068 ngx_resolver_ctx_t *ctx, *next; | |
1069 ngx_resolver_node_t *rn; | |
1070 | |
1071 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) { | |
1072 return; | |
1073 } | |
1074 | |
1075 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); | |
1076 | |
1077 hash = ngx_crc32_short(name.data, name.len); | |
1078 | |
1079 /* lock name mutex */ | |
1080 | |
1081 rn = ngx_resolver_lookup_name(r, &name, hash); | |
1082 | |
1083 if (rn == NULL || rn->query == NULL) { | |
1084 ngx_log_error(r->log_level, r->log, 0, | |
1085 "unexpected response for %V", &name); | |
1086 goto failed; | |
1087 } | |
1088 | |
1089 qident = (rn->query[0] << 8) + rn->query[1]; | |
1090 | |
1091 if (ident != qident) { | |
1092 ngx_log_error(r->log_level, r->log, 0, | |
1093 "wrong ident %d response for %V, expect %d", | |
1094 ident, &name, qident); | |
1095 goto failed; | |
1096 } | |
1097 | |
1742
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1098 if (code == 0 && nan == 0) { |
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1099 code = 3; /* NXDOMAIN */ |
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1100 } |
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1101 |
1649 | 1102 if (code) { |
1103 next = rn->waiting; | |
1104 rn->waiting = NULL; | |
1105 | |
1106 ngx_queue_remove(&rn->queue); | |
1107 | |
1108 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
1109 | |
1110 ngx_resolver_free_node(r, rn); | |
1111 | |
1112 /* unlock name mutex */ | |
1113 | |
1114 while (next) { | |
1115 ctx = next; | |
1116 ctx->state = code; | |
1117 next = ctx->next; | |
1118 | |
1119 ctx->handler(ctx); | |
1120 } | |
1121 | |
1122 return; | |
1123 } | |
1124 | |
1125 i = ans; | |
1126 naddrs = 0; | |
1127 addr = 0; | |
1128 addrs = NULL; | |
1129 cname = NULL; | |
1130 qtype = 0; | |
1131 | |
1132 for (a = 0; a < nan; a++) { | |
1133 | |
1134 start = i; | |
1135 | |
1136 while (i < last) { | |
1137 | |
1138 if (buf[i] & 0xc0) { | |
1139 i += 2; | |
1140 goto found; | |
1141 } | |
1142 | |
1143 if (buf[i] == 0) { | |
1144 i++; | |
1145 goto test_length; | |
1146 } | |
1147 | |
1148 i += 1 + buf[i]; | |
1149 } | |
1150 | |
1151 goto short_response; | |
1152 | |
1153 test_length: | |
1154 | |
1155 if (i - start < 2) { | |
1156 err = "invalid name in dns response"; | |
1157 goto invalid; | |
1158 } | |
1159 | |
1160 found: | |
1161 | |
1162 if (i + sizeof(ngx_resolver_an_t) >= last) { | |
1163 goto short_response; | |
1164 } | |
1165 | |
1166 an = (ngx_resolver_an_t *) &buf[i]; | |
1167 | |
1168 qtype = (an->type_hi << 8) + an->type_lo; | |
1169 len = (an->len_hi << 8) + an->len_lo; | |
1170 | |
1171 if (qtype == NGX_RESOLVE_A) { | |
1172 | |
1173 i += sizeof(ngx_resolver_an_t); | |
1174 | |
1175 if (i + len > last) { | |
1176 goto short_response; | |
1177 } | |
1178 | |
1179 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
1180 + (buf[i + 2] << 8) + (buf[i + 3])); | |
1181 | |
1182 naddrs++; | |
1183 | |
1184 i += len; | |
1185 | |
1186 } else if (qtype == NGX_RESOLVE_CNAME) { | |
1187 cname = &buf[i] + sizeof(ngx_resolver_an_t); | |
1188 i += sizeof(ngx_resolver_an_t) + len; | |
1965 | 1189 |
1190 } else if (qtype == NGX_RESOLVE_DNAME) { | |
1191 i += sizeof(ngx_resolver_an_t) + len; | |
1649 | 1192 } |
1193 } | |
1194 | |
1195 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1196 "resolver naddrs:%ui cname:%p", naddrs, cname); | |
1197 | |
1198 if (naddrs) { | |
1199 | |
1200 if (naddrs == 1) { | |
1201 rn->u.addr = addr; | |
1202 | |
1203 } else { | |
1204 | |
1205 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t)); | |
1206 if (addrs == NULL) { | |
1207 return; | |
1208 } | |
1209 | |
1210 n = 0; | |
1211 i = ans; | |
1212 | |
1213 for (a = 0; a < nan; a++) { | |
1214 | |
1215 for ( ;; ) { | |
1216 | |
1217 if (buf[i] & 0xc0) { | |
1218 i += 2; | |
1219 goto ok; | |
1220 } | |
1221 | |
1222 if (buf[i] == 0) { | |
1223 i++; | |
1224 goto ok; | |
1225 } | |
1226 | |
1227 i += 1 + buf[i]; | |
1228 } | |
1229 | |
1230 ok: | |
1231 | |
1232 an = (ngx_resolver_an_t *) &buf[i]; | |
1233 | |
1234 qtype = (an->type_hi << 8) + an->type_lo; | |
1235 len = (an->len_hi << 8) + an->len_lo; | |
1236 | |
1237 i += sizeof(ngx_resolver_an_t); | |
1238 | |
1239 if (qtype == NGX_RESOLVE_A) { | |
1240 | |
1241 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
1242 + (buf[i + 2] << 8) + (buf[i + 3])); | |
1243 | |
1244 if (n == naddrs) { | |
1245 break; | |
1246 } | |
1247 } | |
1248 | |
1249 i += len; | |
1250 } | |
1251 | |
1252 rn->u.addrs = addrs; | |
1253 | |
1254 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
1255 naddrs * sizeof(in_addr_t)); | |
1256 if (addrs == NULL) { | |
1257 return; | |
1258 } | |
1259 } | |
1260 | |
1261 rn->naddrs = (u_short) naddrs; | |
1262 | |
1263 ngx_queue_remove(&rn->queue); | |
1264 | |
1265 rn->valid = ngx_time() + r->valid; | |
1266 rn->expire = ngx_time() + r->expire; | |
1267 | |
1268 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
1269 | |
1270 next = rn->waiting; | |
1271 rn->waiting = NULL; | |
1272 | |
1273 /* unlock name mutex */ | |
1274 | |
1275 while (next) { | |
1276 ctx = next; | |
1277 ctx->state = NGX_OK; | |
1278 ctx->naddrs = naddrs; | |
1279 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
1280 ctx->addr = addr; | |
1281 next = ctx->next; | |
1282 | |
1283 ctx->handler(ctx); | |
1284 } | |
1285 | |
1286 if (naddrs) { | |
1287 ngx_resolver_free(r, addrs); | |
1288 } | |
1289 | |
1290 return; | |
1291 | |
1292 } else if (cname) { | |
1293 | |
1294 /* CNAME only */ | |
1295 | |
1296 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) { | |
1297 return; | |
1298 } | |
1299 | |
1300 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1301 "resolver cname:\"%V\"", &name); | |
1302 | |
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diff
changeset
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1303 ngx_queue_remove(&rn->queue); |
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changeset
|
1304 |
1649 | 1305 rn->cnlen = (u_short) name.len; |
1306 rn->u.cname = name.data; | |
1307 rn->valid = ngx_time() + r->valid; | |
1308 rn->expire = ngx_time() + r->expire; | |
1309 | |
1310 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
1311 | |
1312 ctx = rn->waiting; | |
1313 rn->waiting = NULL; | |
1314 | |
1315 if (ctx) { | |
1316 ctx->name = name; | |
1317 | |
1318 (void) ngx_resolve_name_locked(r, ctx); | |
1319 } | |
1320 | |
1321 return; | |
1322 } | |
1323 | |
1324 ngx_log_error(r->log_level, r->log, 0, | |
1325 "no A or CNAME types in DNS responses, unknown query type: %d", | |
1326 qtype); | |
1327 return; | |
1328 | |
1329 short_response: | |
1330 | |
1331 err = "short dns response"; | |
1332 | |
1333 invalid: | |
1334 | |
1335 /* unlock name mutex */ | |
1336 | |
1337 ngx_log_error(r->log_level, r->log, 0, err); | |
1338 | |
1339 return; | |
1340 | |
1341 failed: | |
1342 | |
1343 /* unlock name mutex */ | |
1344 | |
1345 return; | |
1346 } | |
1347 | |
1348 | |
1349 static void | |
1350 ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, | |
1742
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diff
changeset
|
1351 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan) |
1649 | 1352 { |
1353 char *err; | |
1354 size_t len; | |
1355 in_addr_t addr; | |
1356 ngx_int_t digit; | |
1357 ngx_str_t name; | |
1358 ngx_uint_t i, mask, qtype, qclass, qident; | |
1359 ngx_resolver_an_t *an; | |
1360 ngx_resolver_ctx_t *ctx, *next; | |
1361 ngx_resolver_node_t *rn; | |
1362 | |
1363 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) { | |
1364 goto invalid_in_addr_arpa; | |
1365 } | |
1366 | |
1367 addr = 0; | |
1368 i = 12; | |
1369 | |
1370 for (mask = 0; mask < 32; mask += 8) { | |
1371 len = buf[i++]; | |
1372 | |
1373 digit = ngx_atoi(&buf[i], len); | |
1374 if (digit == NGX_ERROR || digit > 255) { | |
1375 goto invalid_in_addr_arpa; | |
1376 } | |
1377 | |
1378 addr += digit << mask; | |
1379 i += len; | |
1380 } | |
1381 | |
1382 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) { | |
1383 goto invalid_in_addr_arpa; | |
1384 } | |
1385 | |
1386 /* lock addr mutex */ | |
1387 | |
1388 rn = ngx_resolver_lookup_addr(r, addr); | |
1389 | |
1390 if (rn == NULL || rn->query == NULL) { | |
1391 ngx_log_error(r->log_level, r->log, 0, | |
1392 "unexpected response for %ud.%ud.%ud.%ud", | |
1393 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
1394 (addr >> 8) & 0xff, addr & 0xff); | |
1395 goto failed; | |
1396 } | |
1397 | |
1398 qident = (rn->query[0] << 8) + rn->query[1]; | |
1399 | |
1400 if (ident != qident) { | |
1401 ngx_log_error(r->log_level, r->log, 0, | |
1402 "wrong ident %d response for %ud.%ud.%ud.%ud, expect %d", | |
1403 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
1404 (addr >> 8) & 0xff, addr & 0xff, qident); | |
1405 goto failed; | |
1406 } | |
1407 | |
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parents:
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diff
changeset
|
1408 if (code == 0 && nan == 0) { |
268b81386fe4
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diff
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|
1409 code = 3; /* NXDOMAIN */ |
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|
1410 } |
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|
1411 |
1649 | 1412 if (code) { |
1413 next = rn->waiting; | |
1414 rn->waiting = NULL; | |
1415 | |
1416 ngx_queue_remove(&rn->queue); | |
1417 | |
1418 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
1419 | |
1420 ngx_resolver_free_node(r, rn); | |
1421 | |
1422 /* unlock addr mutex */ | |
1423 | |
1424 while (next) { | |
1425 ctx = next; | |
1426 ctx->state = code; | |
1427 next = ctx->next; | |
1428 | |
1429 ctx->handler(ctx); | |
1430 } | |
1431 | |
1432 return; | |
1433 } | |
1434 | |
1435 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t); | |
1436 | |
1437 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) { | |
1438 goto short_response; | |
1439 } | |
1440 | |
1441 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */ | |
1442 | |
1443 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) { | |
1444 err = "invalid in-addr.arpa name in DNS response"; | |
1445 goto invalid; | |
1446 } | |
1447 | |
1448 an = (ngx_resolver_an_t *) &buf[i + 2]; | |
1449 | |
1450 qtype = (an->type_hi << 8) + an->type_lo; | |
1451 qclass = (an->class_hi << 8) + an->class_lo; | |
1452 len = (an->len_hi << 8) + an->len_lo; | |
1453 | |
1454 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1455 "resolver qt:%d cl:%d len:%uz", qtype, qclass, len); | |
1456 | |
1457 i += 2 + sizeof(ngx_resolver_an_t); | |
1458 | |
1459 if (i + len > (ngx_uint_t) n) { | |
1460 goto short_response; | |
1461 } | |
1462 | |
1463 len -= 2; | |
1464 | |
1465 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) { | |
1466 return; | |
1467 } | |
1468 | |
1469 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name); | |
1470 | |
1471 if (len != (size_t) rn->nlen || ngx_strncmp(name.data, rn->name, len) != 0) | |
1472 { | |
1473 ngx_resolver_free(r, rn->name); | |
1474 rn->name = name.data; | |
1475 | |
1476 name.data = ngx_resolver_dup(r, rn->name, len); | |
1477 if (name.data == NULL) { | |
1478 goto failed; | |
1479 } | |
1480 } | |
1481 | |
1482 ngx_queue_remove(&rn->queue); | |
1483 | |
1484 rn->valid = ngx_time() + r->valid; | |
1485 rn->expire = ngx_time() + r->expire; | |
1486 | |
1487 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
1488 | |
1489 next = rn->waiting; | |
1490 rn->waiting = NULL; | |
1491 | |
1492 /* unlock addr mutex */ | |
1493 | |
1494 while (next) { | |
1495 ctx = next; | |
1496 ctx->state = NGX_OK; | |
1497 ctx->name = name; | |
1498 next = ctx->next; | |
1499 | |
1500 ctx->handler(ctx); | |
1501 } | |
1502 | |
1503 ngx_resolver_free(r, name.data); | |
1504 | |
1505 return; | |
1506 | |
1507 invalid_in_addr_arpa: | |
1508 | |
1509 ngx_log_error(r->log_level, r->log, 0, | |
1510 "invalid in-addr.arpa name in DNS response"); | |
1511 return; | |
1512 | |
1513 short_response: | |
1514 | |
1515 err = "short DNS response"; | |
1516 | |
1517 invalid: | |
1518 | |
1519 /* unlock addr mutex */ | |
1520 | |
1521 ngx_log_error(r->log_level, r->log, 0, err); | |
1522 | |
1523 return; | |
1524 | |
1525 failed: | |
1526 | |
1527 /* unlock addr mutex */ | |
1528 | |
1529 return; | |
1530 } | |
1531 | |
1532 | |
1533 static ngx_resolver_node_t * | |
1534 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) | |
1535 { | |
1536 ngx_int_t rc; | |
1537 size_t len; | |
1538 ngx_rbtree_node_t *node, *sentinel; | |
1539 ngx_resolver_node_t *rn; | |
1540 | |
1541 node = r->name_rbtree.root; | |
1542 sentinel = r->name_rbtree.sentinel; | |
1543 | |
1544 while (node != sentinel) { | |
1545 | |
1546 if (hash < node->key) { | |
1547 node = node->left; | |
1548 continue; | |
1549 } | |
1550 | |
1551 if (hash > node->key) { | |
1552 node = node->right; | |
1553 continue; | |
1554 } | |
1555 | |
1556 /* hash == node->key */ | |
1557 | |
1558 do { | |
1559 rn = (ngx_resolver_node_t *) node; | |
1560 | |
1561 len = (name->len > (size_t) rn->nlen) ? rn->nlen : name->len; | |
1562 | |
1563 rc = ngx_strncmp(name->data, rn->name, len); | |
1564 | |
1565 if (rc == 0) { | |
1566 return rn; | |
1567 } | |
1568 | |
1569 node = (rc < 0) ? node->left : node->right; | |
1570 | |
1571 } while (node != sentinel && hash == node->key); | |
1572 | |
1573 break; | |
1574 } | |
1575 | |
1576 /* not found */ | |
1577 | |
1578 return NULL; | |
1579 } | |
1580 | |
1581 | |
1582 static ngx_resolver_node_t * | |
1583 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr) | |
1584 { | |
1585 ngx_rbtree_node_t *node, *sentinel; | |
1586 | |
1587 node = r->addr_rbtree.root; | |
1588 sentinel = r->addr_rbtree.sentinel; | |
1589 | |
1590 while (node != sentinel) { | |
1591 | |
1592 if (addr < node->key) { | |
1593 node = node->left; | |
1594 continue; | |
1595 } | |
1596 | |
1597 if (addr > node->key) { | |
1598 node = node->right; | |
1599 continue; | |
1600 } | |
1601 | |
1602 /* addr == node->key */ | |
1603 | |
1604 return (ngx_resolver_node_t *) node; | |
1605 } | |
1606 | |
1607 /* not found */ | |
1608 | |
1609 return NULL; | |
1610 } | |
1611 | |
1612 | |
1613 static void | |
1614 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
1615 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
1616 { | |
1617 size_t len; | |
1618 ngx_rbtree_node_t **p; | |
1619 ngx_resolver_node_t *rn, *rn_temp; | |
1620 | |
1621 for ( ;; ) { | |
1622 | |
1623 if (node->key < temp->key) { | |
1624 | |
1625 p = &temp->left; | |
1626 | |
1627 } else if (node->key > temp->key) { | |
1628 | |
1629 p = &temp->right; | |
1630 | |
1631 } else { /* node->key == temp->key */ | |
1632 | |
1633 rn = (ngx_resolver_node_t *) node; | |
1634 rn_temp = (ngx_resolver_node_t *) temp; | |
1635 | |
1636 len = (rn->nlen > rn_temp->nlen) ? rn_temp->nlen : rn->nlen; | |
1637 | |
1638 p = (ngx_strncmp(rn->name, rn_temp->name, len) < 0) | |
1639 ? &temp->left : &temp->right; | |
1640 } | |
1641 | |
1642 if (*p == sentinel) { | |
1643 break; | |
1644 } | |
1645 | |
1646 temp = *p; | |
1647 } | |
1648 | |
1649 *p = node; | |
1650 node->parent = temp; | |
1651 node->left = sentinel; | |
1652 node->right = sentinel; | |
1653 ngx_rbt_red(node); | |
1654 } | |
1655 | |
1656 | |
1657 static ngx_int_t | |
1658 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
1659 { | |
1660 u_char *p, *s; | |
1661 size_t len; | |
1662 ngx_uint_t ident; | |
1663 ngx_resolver_qs_t *qs; | |
1664 ngx_resolver_query_t *query; | |
1665 | |
1666 len = sizeof(ngx_resolver_query_t) | |
1667 + 1 + ctx->name.len + 1 + sizeof(ngx_resolver_qs_t); | |
1668 | |
1669 p = ngx_resolver_calloc(ctx->resolver, len); | |
1670 if (p == NULL) { | |
1671 return NGX_ERROR; | |
1672 } | |
1673 | |
1674 rn->qlen = (u_short) len; | |
1675 rn->query = p; | |
1676 | |
1677 query = (ngx_resolver_query_t *) p; | |
1678 | |
1679 ident = ngx_random(); | |
1680 | |
1681 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0, | |
1682 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff); | |
1683 | |
1684 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
1685 query->ident_lo = (u_char) (ident & 0xff); | |
1686 | |
1687 /* recursion query */ | |
1688 query->flags_hi = 1; query->flags_lo = 0; | |
1689 | |
1690 /* one question */ | |
1691 query->nqs_hi = 0; query->nqs_lo = 1; | |
1692 query->nan_hi = 0; query->nan_lo = 0; | |
1693 query->nns_hi = 0; query->nns_lo = 0; | |
1694 query->nar_hi = 0; query->nar_lo = 0; | |
1695 | |
1696 p += sizeof(ngx_resolver_query_t) + 1 + ctx->name.len + 1; | |
1697 | |
1698 qs = (ngx_resolver_qs_t *) p; | |
1699 | |
1700 /* query type */ | |
1701 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type; | |
1702 | |
1703 /* IP query class */ | |
1704 qs->class_hi = 0; qs->class_lo = 1; | |
1705 | |
1706 /* convert "www.example.com" to "\3www\7example\3com\0" */ | |
1707 | |
1708 len = 0; | |
1709 p--; | |
1710 *p-- = '\0'; | |
1711 | |
1712 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) { | |
1713 if (*s != '.') { | |
1714 *p = *s; | |
1715 len++; | |
1716 | |
1717 } else { | |
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
1718 if (len == 0) { |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
1719 return NGX_DECLINED; |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
1720 } |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
1721 |
1649 | 1722 *p = (u_char) len; |
1723 len = 0; | |
1724 } | |
1725 | |
1726 p--; | |
1727 } | |
1728 | |
1729 *p = (u_char) len; | |
1730 | |
1731 return NGX_OK; | |
1732 } | |
1733 | |
1734 | |
1735 /* AF_INET only */ | |
1736 | |
1737 static ngx_int_t | |
1738 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
1739 { | |
1740 u_char *p, *d; | |
1741 size_t len; | |
1742 ngx_int_t n; | |
1743 ngx_uint_t ident; | |
1744 ngx_resolver_query_t *query; | |
1745 | |
1746 len = sizeof(ngx_resolver_query_t) | |
1747 + sizeof(".255.255.255.255.in-addr.arpa.") - 1 | |
1748 + sizeof(ngx_resolver_qs_t); | |
1749 | |
1750 p = ngx_resolver_calloc(ctx->resolver, len); | |
1751 if (p == NULL) { | |
1752 return NGX_ERROR; | |
1753 } | |
1754 | |
1755 rn->query = p; | |
1756 query = (ngx_resolver_query_t *) p; | |
1757 | |
1758 ident = ngx_random(); | |
1759 | |
1760 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
1761 query->ident_lo = (u_char) (ident & 0xff); | |
1762 | |
1763 /* recursion query */ | |
1764 query->flags_hi = 1; query->flags_lo = 0; | |
1765 | |
1766 /* one question */ | |
1767 query->nqs_hi = 0; query->nqs_lo = 1; | |
1768 query->nan_hi = 0; query->nan_lo = 0; | |
1769 query->nns_hi = 0; query->nns_lo = 0; | |
1770 query->nar_hi = 0; query->nar_lo = 0; | |
1771 | |
1772 p += sizeof(ngx_resolver_query_t); | |
1773 | |
1774 for (n = 0; n < 32; n += 8){ | |
1775 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff); | |
1776 *p = (u_char) (d - &p[1]); | |
1777 p = d; | |
1778 } | |
1779 | |
1780 /* query type "PTR", IP query class */ | |
1781 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18); | |
1782 | |
1783 rn->qlen = (u_short) | |
1784 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t) | |
1785 - rn->query); | |
1786 | |
1787 return NGX_OK; | |
1788 } | |
1789 | |
1790 | |
1791 static ngx_int_t | |
1792 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src, | |
1793 u_char *last) | |
1794 { | |
1795 char *err; | |
1796 u_char *p, *dst; | |
1797 ssize_t len; | |
1798 ngx_uint_t i, n; | |
1799 | |
1800 p = src; | |
1801 len = -1; | |
1802 | |
1803 /* | |
1804 * compression pointers allow to create endless loop, so we set limit; | |
1805 * 128 pointers should be enough to store 255-byte name | |
1806 */ | |
1807 | |
1808 for (i = 0; i < 128; i++) { | |
1809 n = *p++; | |
1810 | |
1811 if (n == 0) { | |
1812 goto done; | |
1813 } | |
1814 | |
1815 if (n & 0xc0) { | |
1816 n = (n & 0x3f << 8) + *p; | |
1817 p = &buf[n]; | |
1818 | |
1819 } else { | |
1820 len += 1 + n; | |
1821 p = &p[n]; | |
1822 } | |
1823 | |
1824 if (p >= last) { | |
1825 err = "name is out of response"; | |
1826 goto invalid; | |
1827 } | |
1828 } | |
1829 | |
1830 err = "compression pointers loop"; | |
1831 | |
1832 invalid: | |
1833 | |
1834 ngx_log_error(r->log_level, r->log, 0, err); | |
1835 | |
1836 return NGX_ERROR; | |
1837 | |
1838 done: | |
1839 | |
1840 if (name == NULL) { | |
583 | 1841 return NGX_OK; |
1842 } | |
1843 | |
1649 | 1844 dst = ngx_resolver_alloc(r, len); |
1845 if (dst == NULL) { | |
1846 return NGX_ERROR; | |
1847 } | |
1848 | |
1849 name->data = dst; | |
1850 | |
1851 n = *src++; | |
1852 | |
1853 for ( ;; ) { | |
1854 if (n != 0xc0) { | |
1855 ngx_memcpy(dst, src, n); | |
1856 dst += n; | |
1857 src += n; | |
1858 | |
1859 n = *src++; | |
1860 | |
1861 if (n != 0) { | |
1862 *dst++ = '.'; | |
1863 } | |
1864 | |
1865 } else { | |
1866 n = (n & 0x3f << 8) + *src; | |
1867 src = &buf[n]; | |
1868 | |
1869 n = *src++; | |
1870 } | |
1871 | |
1872 if (n == 0) { | |
1873 name->len = dst - name->data; | |
1874 return NGX_OK; | |
1875 } | |
1876 } | |
1877 } | |
1878 | |
1879 | |
1880 static void | |
1881 ngx_resolver_timeout_handler(ngx_event_t *ev) | |
1882 { | |
1883 ngx_resolver_ctx_t *ctx; | |
1884 | |
1885 ctx = ev->data; | |
1886 | |
1887 ctx->state = NGX_RESOLVE_TIMEDOUT; | |
1888 | |
1889 ctx->handler(ctx); | |
1890 } | |
1891 | |
1892 | |
1893 static void | |
1894 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
1895 { | |
1896 /* lock alloc mutex */ | |
1897 | |
1898 if (rn->query) { | |
1899 ngx_resolver_free_locked(r, rn->query); | |
1900 } | |
1901 | |
1902 if (rn->name) { | |
1903 ngx_resolver_free_locked(r, rn->name); | |
1904 } | |
1905 | |
1906 if (rn->cnlen) { | |
1907 ngx_resolver_free_locked(r, rn->u.cname); | |
1908 } | |
1909 | |
1910 if (rn->naddrs > 1) { | |
1911 ngx_resolver_free_locked(r, rn->u.addrs); | |
1912 } | |
1913 | |
1914 ngx_resolver_free_locked(r, rn); | |
1915 | |
1916 /* unlock alloc mutex */ | |
1917 } | |
1918 | |
1919 | |
1920 static void * | |
1921 ngx_resolver_alloc(ngx_resolver_t *r, size_t size) | |
1922 { | |
1923 u_char *p; | |
1924 | |
1925 /* lock alloc mutex */ | |
1926 | |
1927 p = ngx_alloc(size, r->log); | |
1928 | |
1929 /* unlock alloc mutex */ | |
1930 | |
1931 return p; | |
1932 } | |
1933 | |
1934 | |
1903 | 1935 static void * |
1649 | 1936 ngx_resolver_calloc(ngx_resolver_t *r, size_t size) |
1937 { | |
1938 u_char *p; | |
1939 | |
1940 p = ngx_resolver_alloc(r, size); | |
1941 | |
1942 if (p) { | |
1943 ngx_memzero(p, size); | |
1944 } | |
1945 | |
1946 return p; | |
1947 } | |
1948 | |
1949 | |
1950 static void | |
1951 ngx_resolver_free(ngx_resolver_t *r, void *p) | |
1952 { | |
1953 /* lock alloc mutex */ | |
1954 | |
1955 ngx_free(p); | |
1956 | |
1957 /* unlock alloc mutex */ | |
1958 } | |
1959 | |
1960 | |
1961 static void | |
1962 ngx_resolver_free_locked(ngx_resolver_t *r, void *p) | |
1963 { | |
1964 ngx_free(p); | |
1965 } | |
1966 | |
1967 | |
1968 static void * | |
1969 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size) | |
1970 { | |
1971 void *dst; | |
1972 | |
1973 dst = ngx_resolver_alloc(r, size); | |
1974 | |
1975 if (dst == NULL) { | |
1976 return dst; | |
1977 } | |
1978 | |
1979 ngx_memcpy(dst, src, size); | |
1980 | |
1981 return dst; | |
1982 } | |
1983 | |
1984 | |
1985 char * | |
1986 ngx_resolver_strerror(ngx_int_t err) | |
1987 { | |
1988 static char *errors[] = { | |
1989 "Format error", /* FORMERR */ | |
1990 "Server failure", /* SERVFAIL */ | |
1991 "Host not found", /* NXDOMAIN */ | |
1992 "Unimplemented", /* NOTIMP */ | |
1993 "Operation refused" /* REFUSED */ | |
1994 }; | |
1995 | |
1996 if (err > 0 && err < 6) { | |
1997 return errors[err - 1]; | |
1998 } | |
1999 | |
2000 if (err == NGX_RESOLVE_TIMEDOUT) { | |
2001 return "Operation timed out"; | |
2002 } | |
2003 | |
2004 return "Unknown error"; | |
2005 } | |
2006 | |
2007 | |
2008 ngx_int_t | |
2009 ngx_udp_connect(ngx_udp_connection_t *uc) | |
2010 { | |
2011 int rc; | |
2012 ngx_int_t event; | |
2013 ngx_event_t *rev, *wev; | |
2014 ngx_socket_t s; | |
2015 ngx_connection_t *c; | |
2016 | |
583 | 2017 s = ngx_socket(AF_INET, SOCK_DGRAM, 0); |
2018 | |
1649 | 2019 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, uc->log, 0, "UDP socket %d", s); |
583 | 2020 |
2021 if (s == -1) { | |
1649 | 2022 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
583 | 2023 ngx_socket_n " failed"); |
2024 return NGX_ERROR; | |
2025 } | |
2026 | |
1649 | 2027 c = ngx_get_connection(s, uc->log); |
583 | 2028 |
2029 if (c == NULL) { | |
2030 if (ngx_close_socket(s) == -1) { | |
1649 | 2031 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
583 | 2032 ngx_close_socket_n "failed"); |
2033 } | |
2034 | |
2035 return NGX_ERROR; | |
2036 } | |
2037 | |
1649 | 2038 if (ngx_nonblocking(s) == -1) { |
2039 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
2040 ngx_nonblocking_n " failed"); | |
2041 | |
2042 ngx_free_connection(c); | |
2043 | |
2044 if (ngx_close_socket(s) == -1) { | |
2045 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
2046 ngx_close_socket_n " failed"); | |
2047 } | |
2048 | |
2049 return NGX_ERROR; | |
2050 } | |
2051 | |
583 | 2052 rev = c->read; |
2053 wev = c->write; | |
2054 | |
1649 | 2055 rev->log = uc->log; |
2056 wev->log = uc->log; | |
2057 | |
2058 uc->connection = c; | |
583 | 2059 |
2060 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); | |
2061 | |
2062 #if (NGX_THREADS) | |
1649 | 2063 |
2064 /* TODO: lock event when call completion handler */ | |
2065 | |
2066 rev->lock = &c->lock; | |
2067 wev->lock = &c->lock; | |
583 | 2068 rev->own_lock = &c->lock; |
2069 wev->own_lock = &c->lock; | |
1649 | 2070 |
583 | 2071 #endif |
2072 | |
1649 | 2073 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, uc->log, 0, |
2074 "connect to %V, fd:%d #%d", &uc->server, s, c->number); | |
2075 | |
2076 rc = connect(s, uc->sockaddr, uc->socklen); | |
2077 | |
2078 /* TODO: aio, iocp */ | |
583 | 2079 |
2080 if (rc == -1) { | |
1649 | 2081 ngx_log_error(NGX_LOG_CRIT, uc->log, ngx_socket_errno, |
2082 "connect() to %V failed", &uc->server); | |
583 | 2083 |
2084 return NGX_ERROR; | |
2085 } | |
2086 | |
1649 | 2087 /* UDP sockets are always ready to write */ |
2088 wev->ready = 1; | |
2089 | |
2090 if (ngx_add_event) { | |
2091 | |
2092 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ? | |
2093 /* kqueue, epoll */ NGX_CLEAR_EVENT: | |
2094 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT; | |
2095 /* eventport event type has no meaning: oneshot only */ | |
2096 | |
2097 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { | |
2098 return NGX_ERROR; | |
2099 } | |
2100 | |
2101 } else { | |
2102 /* rtsig */ | |
2103 | |
583 | 2104 if (ngx_add_conn(c) == NGX_ERROR) { |
2105 return NGX_ERROR; | |
2106 } | |
2107 } | |
2108 | |
2109 return NGX_OK; | |
2110 } |