Mercurial > hg > nginx
annotate src/core/ngx_resolver.c @ 4683:84d8e60b65f0
Fixed crash in ngx_resolver_cleanup_tree().
If sending a DNS request fails with an error (e.g., when mistakenly trying
to send it to a local IP broadcast), such a request is not deleted if there
are clients waiting on it. However, it was still erroneously removed from
the queue. Later ngx_resolver_cleanup_tree() attempted to remove it from
the queue again that resulted in a NULL pointer dereference.
author | Ruslan Ermilov <ru@nginx.com> |
---|---|
date | Mon, 18 Jun 2012 12:30:45 +0000 |
parents | af9342747669 |
children | f5c2c9d656f9 |
rev | line source |
---|---|
583 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4412 | 4 * Copyright (C) Nginx, Inc. |
583 | 5 */ |
6 | |
7 | |
8 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 #include <ngx_event.h> | |
11 | |
12 | |
1649 | 13 #define NGX_RESOLVER_UDP_SIZE 4096 |
14 | |
15 | |
583 | 16 typedef struct { |
1649 | 17 u_char ident_hi; |
18 u_char ident_lo; | |
19 u_char flags_hi; | |
20 u_char flags_lo; | |
21 u_char nqs_hi; | |
22 u_char nqs_lo; | |
23 u_char nan_hi; | |
24 u_char nan_lo; | |
25 u_char nns_hi; | |
26 u_char nns_lo; | |
27 u_char nar_hi; | |
28 u_char nar_lo; | |
29 } ngx_resolver_query_t; | |
30 | |
31 | |
32 typedef struct { | |
33 u_char type_hi; | |
34 u_char type_lo; | |
35 u_char class_hi; | |
36 u_char class_lo; | |
37 } ngx_resolver_qs_t; | |
38 | |
39 | |
40 typedef struct { | |
41 u_char type_hi; | |
42 u_char type_lo; | |
43 u_char class_hi; | |
44 u_char class_lo; | |
45 u_char ttl[4]; | |
46 u_char len_hi; | |
47 u_char len_lo; | |
48 } ngx_resolver_an_t; | |
49 | |
50 | |
51 ngx_int_t ngx_udp_connect(ngx_udp_connection_t *uc); | |
52 | |
53 | |
1906 | 54 static void ngx_resolver_cleanup(void *data); |
55 static void ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree); | |
1649 | 56 static ngx_int_t ngx_resolve_name_locked(ngx_resolver_t *r, |
57 ngx_resolver_ctx_t *ctx); | |
58 static void ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
59 ngx_queue_t *queue); | |
60 static ngx_int_t ngx_resolver_send_query(ngx_resolver_t *r, | |
61 ngx_resolver_node_t *rn); | |
62 static ngx_int_t ngx_resolver_create_name_query(ngx_resolver_node_t *rn, | |
63 ngx_resolver_ctx_t *ctx); | |
64 static ngx_int_t ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, | |
65 ngx_resolver_ctx_t *ctx); | |
66 static void ngx_resolver_resend_handler(ngx_event_t *ev); | |
67 static time_t ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
68 ngx_queue_t *queue); | |
69 static void ngx_resolver_read_response(ngx_event_t *rev); | |
70 static void ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, | |
71 size_t n); | |
72 static void ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t n, | |
1742
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73 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans); |
1649 | 74 static void ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, |
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75 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan); |
1649 | 76 static ngx_resolver_node_t *ngx_resolver_lookup_name(ngx_resolver_t *r, |
77 ngx_str_t *name, uint32_t hash); | |
78 static ngx_resolver_node_t *ngx_resolver_lookup_addr(ngx_resolver_t *r, | |
79 in_addr_t addr); | |
80 static void ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
81 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel); | |
82 static ngx_int_t ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, | |
83 u_char *buf, u_char *src, u_char *last); | |
84 static void ngx_resolver_timeout_handler(ngx_event_t *ev); | |
85 static void ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn); | |
86 static void *ngx_resolver_alloc(ngx_resolver_t *r, size_t size); | |
1903 | 87 static void *ngx_resolver_calloc(ngx_resolver_t *r, size_t size); |
1649 | 88 static void ngx_resolver_free(ngx_resolver_t *r, void *p); |
89 static void ngx_resolver_free_locked(ngx_resolver_t *r, void *p); | |
90 static void *ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size); | |
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91 static u_char *ngx_resolver_log_error(ngx_log_t *log, u_char *buf, size_t len); |
1649 | 92 |
93 | |
94 ngx_resolver_t * | |
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95 ngx_resolver_create(ngx_conf_t *cf, ngx_str_t *names, ngx_uint_t n) |
1649 | 96 { |
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97 ngx_str_t s; |
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98 ngx_url_t u; |
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99 ngx_uint_t i; |
1649 | 100 ngx_resolver_t *r; |
1906 | 101 ngx_pool_cleanup_t *cln; |
1649 | 102 ngx_udp_connection_t *uc; |
103 | |
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104 cln = ngx_pool_cleanup_add(cf->pool, 0); |
1906 | 105 if (cln == NULL) { |
106 return NULL; | |
107 } | |
108 | |
109 cln->handler = ngx_resolver_cleanup; | |
110 | |
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111 r = ngx_calloc(sizeof(ngx_resolver_t), cf->log); |
1649 | 112 if (r == NULL) { |
113 return NULL; | |
114 } | |
115 | |
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116 if (n) { |
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117 if (ngx_array_init(&r->udp_connections, cf->pool, n, |
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118 sizeof(ngx_udp_connection_t)) |
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119 != NGX_OK) |
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120 { |
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121 return NULL; |
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122 } |
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123 } |
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124 |
1906 | 125 cln->data = r; |
126 | |
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127 r->event = ngx_calloc(sizeof(ngx_event_t), cf->log); |
1649 | 128 if (r->event == NULL) { |
129 return NULL; | |
130 } | |
131 | |
1687 | 132 ngx_rbtree_init(&r->name_rbtree, &r->name_sentinel, |
133 ngx_resolver_rbtree_insert_value); | |
134 | |
135 ngx_rbtree_init(&r->addr_rbtree, &r->addr_sentinel, | |
136 ngx_rbtree_insert_value); | |
1649 | 137 |
1685 | 138 ngx_queue_init(&r->name_resend_queue); |
139 ngx_queue_init(&r->addr_resend_queue); | |
140 | |
141 ngx_queue_init(&r->name_expire_queue); | |
142 ngx_queue_init(&r->addr_expire_queue); | |
1649 | 143 |
144 r->event->handler = ngx_resolver_resend_handler; | |
145 r->event->data = r; | |
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146 r->event->log = &cf->cycle->new_log; |
1649 | 147 r->ident = -1; |
148 | |
149 r->resend_timeout = 5; | |
150 r->expire = 30; | |
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151 r->valid = 0; |
1649 | 152 |
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153 r->log = &cf->cycle->new_log; |
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154 r->log_level = NGX_LOG_ERR; |
1649 | 155 |
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156 for (i = 0; i < n; i++) { |
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157 if (ngx_strncmp(names[i].data, "valid=", 6) == 0) { |
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158 s.len = names[i].len - 6; |
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159 s.data = names[i].data + 6; |
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160 |
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161 r->valid = ngx_parse_time(&s, 1); |
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162 |
4474 | 163 if (r->valid == (time_t) NGX_ERROR) { |
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164 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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165 "invalid parameter: %V", &names[i]); |
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166 return NULL; |
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167 } |
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168 |
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169 continue; |
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170 } |
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171 |
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172 ngx_memzero(&u, sizeof(ngx_url_t)); |
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173 |
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174 u.url = names[i]; |
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175 u.default_port = 53; |
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176 |
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177 if (ngx_parse_url(cf->pool, &u) != NGX_OK) { |
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178 if (u.err) { |
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179 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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180 "%s in resolver \"%V\"", |
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181 u.err, &u.url); |
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182 } |
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183 |
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184 return NULL; |
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185 } |
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186 |
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187 uc = ngx_array_push(&r->udp_connections); |
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188 if (uc == NULL) { |
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189 return NULL; |
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190 } |
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191 |
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192 ngx_memzero(uc, sizeof(ngx_udp_connection_t)); |
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193 |
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194 uc->sockaddr = u.addrs->sockaddr; |
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195 uc->socklen = u.addrs->socklen; |
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196 uc->server = u.addrs->name; |
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197 } |
1649 | 198 |
199 return r; | |
200 } | |
201 | |
202 | |
1906 | 203 static void |
204 ngx_resolver_cleanup(void *data) | |
205 { | |
206 ngx_resolver_t *r = data; | |
207 | |
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208 ngx_uint_t i; |
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209 ngx_udp_connection_t *uc; |
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210 |
1906 | 211 if (r) { |
212 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, | |
213 "cleanup resolver"); | |
214 | |
215 ngx_resolver_cleanup_tree(r, &r->name_rbtree); | |
216 | |
217 ngx_resolver_cleanup_tree(r, &r->addr_rbtree); | |
218 | |
219 if (r->event) { | |
220 ngx_free(r->event); | |
221 } | |
222 | |
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223 |
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224 uc = r->udp_connections.elts; |
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225 |
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226 for (i = 0; i < r->udp_connections.nelts; i++) { |
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227 if (uc[i].connection) { |
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228 ngx_close_connection(uc[i].connection); |
1906 | 229 } |
230 } | |
231 | |
232 ngx_free(r); | |
233 } | |
234 } | |
235 | |
236 | |
237 static void | |
238 ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree) | |
239 { | |
240 ngx_resolver_ctx_t *ctx, *next; | |
241 ngx_resolver_node_t *rn; | |
242 | |
243 while (tree->root != tree->sentinel) { | |
244 | |
245 rn = (ngx_resolver_node_t *) ngx_rbtree_min(tree->root, tree->sentinel); | |
246 | |
247 ngx_queue_remove(&rn->queue); | |
248 | |
249 for (ctx = rn->waiting; ctx; ctx = next) { | |
2006
b52cb9bf2064
style fix: remove tabs and trailing spaces
Igor Sysoev <igor@sysoev.ru>
parents:
1969
diff
changeset
|
250 next = ctx->next; |
1906 | 251 |
252 if (ctx->event) { | |
253 ngx_resolver_free(r, ctx->event); | |
254 } | |
255 | |
256 ngx_resolver_free(r, ctx); | |
257 } | |
258 | |
259 ngx_rbtree_delete(tree, &rn->node); | |
260 | |
261 ngx_resolver_free_node(r, rn); | |
262 } | |
263 } | |
264 | |
265 | |
1649 | 266 ngx_resolver_ctx_t * |
267 ngx_resolve_start(ngx_resolver_t *r, ngx_resolver_ctx_t *temp) | |
268 { | |
269 in_addr_t addr; | |
270 ngx_resolver_ctx_t *ctx; | |
271 | |
272 if (temp) { | |
273 addr = ngx_inet_addr(temp->name.data, temp->name.len); | |
274 | |
275 if (addr != INADDR_NONE) { | |
276 temp->resolver = r; | |
277 temp->state = NGX_OK; | |
278 temp->naddrs = 1; | |
279 temp->addrs = &temp->addr; | |
280 temp->addr = addr; | |
281 temp->quick = 1; | |
282 | |
283 return temp; | |
284 } | |
285 } | |
286 | |
4225
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
287 if (r->udp_connections.nelts == 0) { |
1683
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
|
288 return NGX_NO_RESOLVER; |
1e0b028055ec
allow to use IP addresses without defined resolver
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parents:
1679
diff
changeset
|
289 } |
1e0b028055ec
allow to use IP addresses without defined resolver
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parents:
1679
diff
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|
290 |
1649 | 291 ctx = ngx_resolver_calloc(r, sizeof(ngx_resolver_ctx_t)); |
292 | |
293 if (ctx) { | |
294 ctx->resolver = r; | |
295 } | |
296 | |
297 return ctx; | |
298 } | |
299 | |
300 | |
301 ngx_int_t | |
302 ngx_resolve_name(ngx_resolver_ctx_t *ctx) | |
303 { | |
304 ngx_int_t rc; | |
305 ngx_resolver_t *r; | |
306 | |
307 r = ctx->resolver; | |
308 | |
309 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
310 "resolve: \"%V\"", &ctx->name); | |
311 | |
312 if (ctx->quick) { | |
313 ctx->handler(ctx); | |
314 return NGX_OK; | |
315 } | |
316 | |
317 /* lock name mutex */ | |
318 | |
319 rc = ngx_resolve_name_locked(r, ctx); | |
320 | |
321 if (rc == NGX_OK) { | |
322 return NGX_OK; | |
323 } | |
324 | |
325 /* unlock name mutex */ | |
326 | |
327 if (rc == NGX_AGAIN) { | |
328 return NGX_OK; | |
329 } | |
330 | |
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
331 /* NGX_ERROR */ |
1649 | 332 |
333 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
|
334 ngx_resolver_free(r, ctx->event); |
1649 | 335 } |
336 | |
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
337 ngx_resolver_free(r, ctx); |
1649 | 338 |
339 return NGX_ERROR; | |
340 } | |
341 | |
342 | |
343 void | |
344 ngx_resolve_name_done(ngx_resolver_ctx_t *ctx) | |
345 { | |
346 uint32_t hash; | |
347 ngx_resolver_t *r; | |
348 ngx_resolver_ctx_t *w, **p; | |
349 ngx_resolver_node_t *rn; | |
350 | |
351 r = ctx->resolver; | |
352 | |
353 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
354 "resolve name done: %i", ctx->state); | |
355 | |
356 if (ctx->quick) { | |
357 return; | |
358 } | |
359 | |
360 if (ctx->event && ctx->event->timer_set) { | |
361 ngx_del_timer(ctx->event); | |
362 } | |
363 | |
364 /* lock name mutex */ | |
365 | |
366 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
367 | |
368 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
369 | |
370 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
371 | |
372 if (rn) { | |
373 p = &rn->waiting; | |
374 w = rn->waiting; | |
375 | |
376 while (w) { | |
377 if (w == ctx) { | |
378 *p = w->next; | |
379 | |
380 goto done; | |
381 } | |
382 | |
383 p = &w->next; | |
384 w = w->next; | |
385 } | |
386 } | |
387 | |
388 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
389 "could not cancel %V resolving", &ctx->name); | |
390 } | |
391 | |
392 done: | |
393 | |
394 ngx_resolver_expire(r, &r->name_rbtree, &r->name_expire_queue); | |
395 | |
396 /* unlock name mutex */ | |
397 | |
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
398 /* 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
|
399 |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
400 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
|
401 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
|
402 } |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
403 |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
404 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
|
405 |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
406 /* unlock alloc mutex */ |
1649 | 407 } |
408 | |
409 | |
410 /* NGX_RESOLVE_A only */ | |
411 | |
412 static ngx_int_t | |
413 ngx_resolve_name_locked(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx) | |
414 { | |
415 uint32_t hash; | |
416 in_addr_t addr, *addrs; | |
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
417 ngx_int_t rc; |
1649 | 418 ngx_uint_t naddrs; |
419 ngx_resolver_ctx_t *next; | |
420 ngx_resolver_node_t *rn; | |
421 | |
422 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
423 | |
424 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
425 | |
426 if (rn) { | |
427 | |
428 if (rn->valid >= ngx_time()) { | |
429 | |
430 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
431 | |
432 ngx_queue_remove(&rn->queue); | |
433 | |
434 rn->expire = ngx_time() + r->expire; | |
435 | |
436 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
437 | |
438 naddrs = rn->naddrs; | |
439 | |
440 if (naddrs) { | |
441 | |
442 /* NGX_RESOLVE_A answer */ | |
443 | |
444 if (naddrs != 1) { | |
445 addr = 0; | |
446 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
447 naddrs * sizeof(in_addr_t)); | |
448 if (addrs == NULL) { | |
449 return NGX_ERROR; | |
450 } | |
451 | |
452 } else { | |
453 addr = rn->u.addr; | |
454 addrs = NULL; | |
455 } | |
456 | |
457 ctx->next = rn->waiting; | |
458 rn->waiting = NULL; | |
459 | |
460 /* unlock name mutex */ | |
461 | |
462 do { | |
463 ctx->state = NGX_OK; | |
464 ctx->naddrs = naddrs; | |
465 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
466 ctx->addr = addr; | |
467 next = ctx->next; | |
468 | |
469 ctx->handler(ctx); | |
470 | |
471 ctx = next; | |
472 } while (ctx); | |
473 | |
474 if (addrs) { | |
475 ngx_resolver_free(r, addrs); | |
476 } | |
477 | |
478 return NGX_OK; | |
479 } | |
480 | |
481 /* NGX_RESOLVE_CNAME */ | |
482 | |
1969 | 483 if (ctx->recursion++ < NGX_RESOLVER_MAX_RECURSION) { |
484 | |
485 ctx->name.len = rn->cnlen; | |
486 ctx->name.data = rn->u.cname; | |
487 | |
488 return ngx_resolve_name_locked(r, ctx); | |
489 } | |
490 | |
491 ctx->next = rn->waiting; | |
492 rn->waiting = NULL; | |
493 | |
494 /* unlock name mutex */ | |
495 | |
496 do { | |
497 ctx->state = NGX_RESOLVE_NXDOMAIN; | |
498 next = ctx->next; | |
499 | |
500 ctx->handler(ctx); | |
501 | |
502 ctx = next; | |
503 } while (ctx); | |
504 | |
505 return NGX_OK; | |
1649 | 506 } |
507 | |
508 if (rn->waiting) { | |
509 | |
510 ctx->next = rn->waiting; | |
511 rn->waiting = ctx; | |
3297 | 512 ctx->state = NGX_AGAIN; |
1649 | 513 |
514 return NGX_AGAIN; | |
515 } | |
516 | |
517 ngx_queue_remove(&rn->queue); | |
518 | |
519 /* lock alloc mutex */ | |
520 | |
4619
3171ec7d0d05
Resolver: protection from duplicate responses.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4610
diff
changeset
|
521 if (rn->query) { |
3171ec7d0d05
Resolver: protection from duplicate responses.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4610
diff
changeset
|
522 ngx_resolver_free_locked(r, rn->query); |
3171ec7d0d05
Resolver: protection from duplicate responses.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4610
diff
changeset
|
523 rn->query = NULL; |
3171ec7d0d05
Resolver: protection from duplicate responses.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4610
diff
changeset
|
524 } |
1649 | 525 |
526 if (rn->cnlen) { | |
527 ngx_resolver_free_locked(r, rn->u.cname); | |
528 } | |
529 | |
530 if (rn->naddrs > 1) { | |
531 ngx_resolver_free_locked(r, rn->u.addrs); | |
532 } | |
533 | |
534 /* unlock alloc mutex */ | |
535 | |
536 } else { | |
537 | |
538 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
539 if (rn == NULL) { | |
540 return NGX_ERROR; | |
541 } | |
542 | |
543 rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len); | |
544 if (rn->name == NULL) { | |
545 ngx_resolver_free(r, rn); | |
546 return NGX_ERROR; | |
547 } | |
548 | |
549 rn->node.key = hash; | |
550 rn->nlen = (u_short) ctx->name.len; | |
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
551 rn->query = NULL; |
1649 | 552 |
553 ngx_rbtree_insert(&r->name_rbtree, &rn->node); | |
554 } | |
555 | |
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
556 rc = ngx_resolver_create_name_query(rn, ctx); |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
557 |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
558 if (rc == NGX_ERROR) { |
1649 | 559 goto failed; |
560 } | |
561 | |
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
562 if (rc == NGX_DECLINED) { |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
563 ngx_rbtree_delete(&r->name_rbtree, &rn->node); |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
564 |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
565 ngx_resolver_free(r, rn->query); |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
566 ngx_resolver_free(r, rn->name); |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
567 ngx_resolver_free(r, rn); |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
568 |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
569 ctx->state = NGX_RESOLVE_NXDOMAIN; |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
570 ctx->handler(ctx); |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
571 |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
572 return NGX_OK; |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
573 } |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
574 |
1649 | 575 if (ngx_resolver_send_query(r, rn) != NGX_OK) { |
576 goto failed; | |
577 } | |
578 | |
579 if (ctx->event == NULL) { | |
580 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
581 if (ctx->event == NULL) { | |
582 goto failed; | |
583 } | |
584 | |
585 ctx->event->handler = ngx_resolver_timeout_handler; | |
586 ctx->event->data = ctx; | |
587 ctx->event->log = r->log; | |
588 ctx->ident = -1; | |
589 | |
590 ngx_add_timer(ctx->event, ctx->timeout); | |
591 } | |
592 | |
593 if (ngx_queue_empty(&r->name_resend_queue)) { | |
594 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
595 } | |
596 | |
597 rn->expire = ngx_time() + r->resend_timeout; | |
598 | |
599 ngx_queue_insert_head(&r->name_resend_queue, &rn->queue); | |
600 | |
601 rn->cnlen = 0; | |
602 rn->naddrs = 0; | |
603 rn->valid = 0; | |
604 rn->waiting = ctx; | |
605 | |
606 ctx->state = NGX_AGAIN; | |
607 | |
608 return NGX_AGAIN; | |
609 | |
610 failed: | |
611 | |
612 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
613 | |
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
614 if (rn->query) { |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
615 ngx_resolver_free(r, rn->query); |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
616 } |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
617 |
1649 | 618 ngx_resolver_free(r, rn->name); |
619 | |
620 ngx_resolver_free(r, rn); | |
621 | |
622 return NGX_ERROR; | |
623 } | |
583 | 624 |
625 | |
626 ngx_int_t | |
1649 | 627 ngx_resolve_addr(ngx_resolver_ctx_t *ctx) |
628 { | |
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
629 u_char *name; |
1649 | 630 ngx_resolver_t *r; |
631 ngx_resolver_node_t *rn; | |
632 | |
633 r = ctx->resolver; | |
634 | |
635 ctx->addr = ntohl(ctx->addr); | |
636 | |
637 /* lock addr mutex */ | |
638 | |
639 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
640 | |
641 if (rn) { | |
642 | |
643 if (rn->valid >= ngx_time()) { | |
644 | |
645 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
646 | |
647 ngx_queue_remove(&rn->queue); | |
648 | |
649 rn->expire = ngx_time() + r->expire; | |
650 | |
651 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
652 | |
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
653 name = ngx_resolver_dup(r, rn->name, rn->nlen); |
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
654 if (name == NULL) { |
1649 | 655 goto failed; |
656 } | |
657 | |
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
658 ctx->name.len = rn->nlen; |
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
659 ctx->name.data = name; |
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
660 |
1649 | 661 /* unlock addr mutex */ |
662 | |
663 ctx->state = NGX_OK; | |
664 | |
665 ctx->handler(ctx); | |
666 | |
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
667 ngx_resolver_free(r, name); |
1649 | 668 |
669 return NGX_OK; | |
670 } | |
671 | |
672 if (rn->waiting) { | |
673 | |
674 ctx->next = rn->waiting; | |
675 rn->waiting = ctx; | |
3297 | 676 ctx->state = NGX_AGAIN; |
1649 | 677 |
2487
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
678 /* unlock addr mutex */ |
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
679 |
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
680 return NGX_OK; |
1649 | 681 } |
682 | |
683 ngx_queue_remove(&rn->queue); | |
684 | |
685 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
|
686 rn->query = NULL; |
1649 | 687 |
688 } else { | |
689 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
690 if (rn == NULL) { | |
691 goto failed; | |
692 } | |
693 | |
694 rn->node.key = ctx->addr; | |
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
695 rn->query = NULL; |
1649 | 696 |
697 ngx_rbtree_insert(&r->addr_rbtree, &rn->node); | |
698 } | |
699 | |
700 if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) { | |
701 goto failed; | |
702 } | |
703 | |
704 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
705 goto failed; | |
706 } | |
707 | |
708 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
709 if (ctx->event == NULL) { | |
710 goto failed; | |
711 } | |
712 | |
713 ctx->event->handler = ngx_resolver_timeout_handler; | |
714 ctx->event->data = ctx; | |
715 ctx->event->log = r->log; | |
716 ctx->ident = -1; | |
717 | |
718 ngx_add_timer(ctx->event, ctx->timeout); | |
719 | |
720 if (ngx_queue_empty(&r->addr_resend_queue)) { | |
721 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
722 } | |
723 | |
724 rn->expire = ngx_time() + r->resend_timeout; | |
725 | |
726 ngx_queue_insert_head(&r->addr_resend_queue, &rn->queue); | |
727 | |
728 rn->cnlen = 0; | |
729 rn->naddrs = 0; | |
730 rn->name = NULL; | |
731 rn->nlen = 0; | |
732 rn->valid = 0; | |
733 rn->waiting = ctx; | |
734 | |
735 /* unlock addr mutex */ | |
736 | |
737 ctx->state = NGX_AGAIN; | |
738 | |
739 return NGX_OK; | |
740 | |
741 failed: | |
742 | |
743 if (rn) { | |
744 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
745 | |
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
746 if (rn->query) { |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
747 ngx_resolver_free(r, rn->query); |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
748 } |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
749 |
1649 | 750 ngx_resolver_free(r, rn); |
751 } | |
752 | |
753 /* unlock addr mutex */ | |
754 | |
755 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
|
756 ngx_resolver_free(r, ctx->event); |
1649 | 757 } |
758 | |
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
759 ngx_resolver_free(r, ctx); |
1649 | 760 |
761 return NGX_ERROR; | |
762 } | |
763 | |
764 | |
765 void | |
766 ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx) | |
767 { | |
768 in_addr_t addr; | |
769 ngx_resolver_t *r; | |
770 ngx_resolver_ctx_t *w, **p; | |
771 ngx_resolver_node_t *rn; | |
772 | |
773 r = ctx->resolver; | |
774 | |
775 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
776 "resolve addr done: %i", ctx->state); | |
777 | |
778 if (ctx->event && ctx->event->timer_set) { | |
779 ngx_del_timer(ctx->event); | |
780 } | |
781 | |
782 /* lock addr mutex */ | |
783 | |
784 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
785 | |
786 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
787 | |
788 if (rn) { | |
789 p = &rn->waiting; | |
790 w = rn->waiting; | |
791 | |
792 while (w) { | |
793 if (w == ctx) { | |
794 *p = w->next; | |
795 | |
796 goto done; | |
797 } | |
798 | |
799 p = &w->next; | |
800 w = w->next; | |
801 } | |
802 } | |
803 | |
804 addr = ntohl(ctx->addr); | |
805 | |
806 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
807 "could not cancel %ud.%ud.%ud.%ud resolving", | |
808 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
809 (addr >> 8) & 0xff, addr & 0xff); | |
810 } | |
811 | |
812 done: | |
813 | |
814 ngx_resolver_expire(r, &r->addr_rbtree, &r->addr_expire_queue); | |
815 | |
816 /* unlock addr mutex */ | |
817 | |
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
818 /* 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
|
819 |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
820 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
|
821 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
|
822 } |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
823 |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
824 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
|
825 |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
826 /* unlock alloc mutex */ |
1649 | 827 } |
828 | |
829 | |
830 static void | |
831 ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
832 { | |
833 time_t now; | |
834 ngx_uint_t i; | |
835 ngx_queue_t *q; | |
836 ngx_resolver_node_t *rn; | |
837 | |
838 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire"); | |
839 | |
840 now = ngx_time(); | |
841 | |
842 for (i = 0; i < 2; i++) { | |
843 if (ngx_queue_empty(queue)) { | |
844 return; | |
845 } | |
846 | |
847 q = ngx_queue_last(queue); | |
848 | |
849 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
850 | |
851 if (now <= rn->expire) { | |
852 return; | |
853 } | |
854 | |
1774 | 855 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, |
856 "resolver expire \"%*s\"", (size_t) rn->nlen, rn->name); | |
1649 | 857 |
858 ngx_queue_remove(q); | |
859 | |
860 ngx_rbtree_delete(tree, &rn->node); | |
861 | |
862 ngx_resolver_free_node(r, rn); | |
863 } | |
864 } | |
865 | |
866 | |
867 static ngx_int_t | |
868 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
869 { | |
870 ssize_t n; | |
871 ngx_udp_connection_t *uc; | |
872 | |
4225
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
873 uc = r->udp_connections.elts; |
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
874 |
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
875 uc = &uc[r->last_connection++]; |
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
876 if (r->last_connection == r->udp_connections.nelts) { |
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
877 r->last_connection = 0; |
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
878 } |
1649 | 879 |
880 if (uc->connection == NULL) { | |
4496
be6c250b827b
Fixed null pointer dereference in resolver (ticket #91).
Maxim Dounin <mdounin@mdounin.ru>
parents:
4474
diff
changeset
|
881 |
be6c250b827b
Fixed null pointer dereference in resolver (ticket #91).
Maxim Dounin <mdounin@mdounin.ru>
parents:
4474
diff
changeset
|
882 uc->log = *r->log; |
be6c250b827b
Fixed null pointer dereference in resolver (ticket #91).
Maxim Dounin <mdounin@mdounin.ru>
parents:
4474
diff
changeset
|
883 uc->log.handler = ngx_resolver_log_error; |
be6c250b827b
Fixed null pointer dereference in resolver (ticket #91).
Maxim Dounin <mdounin@mdounin.ru>
parents:
4474
diff
changeset
|
884 uc->log.data = uc; |
be6c250b827b
Fixed null pointer dereference in resolver (ticket #91).
Maxim Dounin <mdounin@mdounin.ru>
parents:
4474
diff
changeset
|
885 uc->log.action = "resolving"; |
be6c250b827b
Fixed null pointer dereference in resolver (ticket #91).
Maxim Dounin <mdounin@mdounin.ru>
parents:
4474
diff
changeset
|
886 |
1649 | 887 if (ngx_udp_connect(uc) != NGX_OK) { |
888 return NGX_ERROR; | |
889 } | |
890 | |
891 uc->connection->data = r; | |
892 uc->connection->read->handler = ngx_resolver_read_response; | |
1906 | 893 uc->connection->read->resolver = 1; |
1649 | 894 } |
895 | |
896 n = ngx_send(uc->connection, rn->query, rn->qlen); | |
897 | |
898 if (n == -1) { | |
899 return NGX_ERROR; | |
900 } | |
901 | |
902 if ((size_t) n != (size_t) rn->qlen) { | |
3408
71193a456616
add context to a resolver log
Igor Sysoev <igor@sysoev.ru>
parents:
3376
diff
changeset
|
903 ngx_log_error(NGX_LOG_CRIT, &uc->log, 0, "send() incomplete"); |
1649 | 904 return NGX_ERROR; |
905 } | |
906 | |
907 return NGX_OK; | |
908 } | |
909 | |
910 | |
911 static void | |
912 ngx_resolver_resend_handler(ngx_event_t *ev) | |
913 { | |
914 time_t timer, atimer, ntimer; | |
915 ngx_resolver_t *r; | |
916 | |
917 r = ev->data; | |
918 | |
919 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, | |
920 "resolver resend handler"); | |
921 | |
922 /* lock name mutex */ | |
923 | |
924 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue); | |
925 | |
926 /* unlock name mutex */ | |
927 | |
928 /* lock addr mutex */ | |
929 | |
930 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
|
931 |
1649 | 932 /* unlock addr mutex */ |
933 | |
934 if (ntimer == 0) { | |
935 timer = atimer; | |
936 | |
937 } else if (atimer == 0) { | |
938 timer = ntimer; | |
939 | |
940 } else { | |
941 timer = (atimer < ntimer) ? atimer : ntimer; | |
942 } | |
943 | |
944 if (timer) { | |
945 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000)); | |
946 } | |
947 } | |
948 | |
949 | |
950 static time_t | |
951 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
952 { | |
953 time_t now; | |
954 ngx_queue_t *q; | |
955 ngx_resolver_node_t *rn; | |
956 | |
957 now = ngx_time(); | |
958 | |
959 for ( ;; ) { | |
960 if (ngx_queue_empty(queue)) { | |
961 return 0; | |
962 } | |
963 | |
964 q = ngx_queue_last(queue); | |
965 | |
966 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
967 | |
968 if (now < rn->expire) { | |
969 return rn->expire - now; | |
970 } | |
971 | |
1774 | 972 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, |
973 "resolver resend \"%*s\" %p", | |
974 (size_t) rn->nlen, rn->name, rn->waiting); | |
1649 | 975 |
976 ngx_queue_remove(q); | |
977 | |
978 if (rn->waiting) { | |
979 | |
4683
84d8e60b65f0
Fixed crash in ngx_resolver_cleanup_tree().
Ruslan Ermilov <ru@nginx.com>
parents:
4671
diff
changeset
|
980 (void) ngx_resolver_send_query(r, rn); |
84d8e60b65f0
Fixed crash in ngx_resolver_cleanup_tree().
Ruslan Ermilov <ru@nginx.com>
parents:
4671
diff
changeset
|
981 |
84d8e60b65f0
Fixed crash in ngx_resolver_cleanup_tree().
Ruslan Ermilov <ru@nginx.com>
parents:
4671
diff
changeset
|
982 rn->expire = now + r->resend_timeout; |
84d8e60b65f0
Fixed crash in ngx_resolver_cleanup_tree().
Ruslan Ermilov <ru@nginx.com>
parents:
4671
diff
changeset
|
983 |
84d8e60b65f0
Fixed crash in ngx_resolver_cleanup_tree().
Ruslan Ermilov <ru@nginx.com>
parents:
4671
diff
changeset
|
984 ngx_queue_insert_head(queue, q); |
1879
cf4ee321d195
do not delete failed DNS request if there are waiting clients
Igor Sysoev <igor@sysoev.ru>
parents:
1878
diff
changeset
|
985 |
cf4ee321d195
do not delete failed DNS request if there are waiting clients
Igor Sysoev <igor@sysoev.ru>
parents:
1878
diff
changeset
|
986 continue; |
1649 | 987 } |
988 | |
989 ngx_rbtree_delete(tree, &rn->node); | |
990 | |
991 ngx_resolver_free_node(r, rn); | |
992 } | |
993 } | |
994 | |
995 | |
996 static void | |
997 ngx_resolver_read_response(ngx_event_t *rev) | |
998 { | |
999 ssize_t n; | |
1000 ngx_connection_t *c; | |
1001 u_char buf[NGX_RESOLVER_UDP_SIZE]; | |
1002 | |
1003 c = rev->data; | |
1004 | |
1005 do { | |
1689 | 1006 n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE); |
1007 | |
1008 if (n < 0) { | |
1649 | 1009 return; |
1010 } | |
1011 | |
1012 ngx_resolver_process_response(c->data, buf, n); | |
1013 | |
1014 } while (rev->ready); | |
1015 } | |
1016 | |
1017 | |
1018 static void | |
1019 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n) | |
1020 { | |
1021 char *err; | |
1022 size_t len; | |
2282
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1023 ngx_uint_t i, times, ident, qident, flags, code, nqs, nan, |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1024 qtype, qclass; |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1025 ngx_queue_t *q; |
1649 | 1026 ngx_resolver_qs_t *qs; |
2282
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1027 ngx_resolver_node_t *rn; |
1649 | 1028 ngx_resolver_query_t *query; |
1029 | |
2281
5004229420a6
FORMERR DNS response may be equal to mininal query size
Igor Sysoev <igor@sysoev.ru>
parents:
2006
diff
changeset
|
1030 if ((size_t) n < sizeof(ngx_resolver_query_t)) { |
1649 | 1031 goto short_response; |
1032 } | |
1033 | |
1034 query = (ngx_resolver_query_t *) buf; | |
1035 | |
1036 ident = (query->ident_hi << 8) + query->ident_lo; | |
1037 flags = (query->flags_hi << 8) + query->flags_lo; | |
1038 nqs = (query->nqs_hi << 8) + query->nqs_lo; | |
1039 nan = (query->nan_hi << 8) + query->nan_lo; | |
1040 | |
1041 ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0, | |
4653
134ccdf44647
Resolver: fixed format specification.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4643
diff
changeset
|
1042 "resolver DNS response %ui fl:%04Xui %ui/%ui/%ud/%ud", |
1649 | 1043 ident, flags, nqs, nan, |
1044 (query->nns_hi << 8) + query->nns_lo, | |
1045 (query->nar_hi << 8) + query->nar_lo); | |
1046 | |
1047 if (!(flags & 0x8000)) { | |
1048 ngx_log_error(r->log_level, r->log, 0, | |
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1049 "invalid DNS response %ui fl:%04Xui", ident, flags); |
1649 | 1050 return; |
1051 } | |
1052 | |
1053 code = flags & 0x7f; | |
1054 | |
2282
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1055 if (code == NGX_RESOLVE_FORMERR) { |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1056 |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1057 times = 0; |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1058 |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1059 for (q = ngx_queue_head(&r->name_resend_queue); |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1060 q != ngx_queue_sentinel(&r->name_resend_queue) || times++ < 100; |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1061 q = ngx_queue_next(q)) |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1062 { |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1063 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1064 qident = (rn->query[0] << 8) + rn->query[1]; |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1065 |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1066 if (qident == ident) { |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1067 ngx_log_error(r->log_level, r->log, 0, |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1068 "DNS error (%ui: %s), query id:%ui, name:\"%*s\"", |
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show name for a FORMERR DNS response
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diff
changeset
|
1069 code, ngx_resolver_strerror(code), ident, |
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diff
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|
1070 rn->nlen, rn->name); |
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show name for a FORMERR DNS response
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diff
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|
1071 return; |
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show name for a FORMERR DNS response
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diff
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|
1072 } |
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show name for a FORMERR DNS response
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diff
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|
1073 } |
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show name for a FORMERR DNS response
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diff
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|
1074 |
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show name for a FORMERR DNS response
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diff
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|
1075 goto dns_error; |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
1076 } |
ec97eb9a8038
show name for a FORMERR DNS response
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diff
changeset
|
1077 |
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show name for a FORMERR DNS response
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diff
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|
1078 if (code > NGX_RESOLVE_REFUSED) { |
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show name for a FORMERR DNS response
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parents:
2281
diff
changeset
|
1079 goto dns_error; |
1649 | 1080 } |
1081 | |
1082 if (nqs != 1) { | |
1083 err = "invalid number of questions in DNS response"; | |
1084 goto done; | |
1085 } | |
1086 | |
1087 i = sizeof(ngx_resolver_query_t); | |
1088 | |
1089 while (i < (ngx_uint_t) n) { | |
1090 if (buf[i] == '\0') { | |
1091 goto found; | |
1092 } | |
1093 | |
1094 len = buf[i]; | |
1095 i += 1 + len; | |
1096 } | |
1097 | |
1098 goto short_response; | |
1099 | |
1100 found: | |
1101 | |
1102 if (i++ == 0) { | |
1103 err = "zero-length domain name in DNS response"; | |
1104 goto done; | |
1105 } | |
1106 | |
1107 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t)) | |
1108 > (ngx_uint_t) n) | |
1109 { | |
1110 goto short_response; | |
1111 } | |
1112 | |
1113 qs = (ngx_resolver_qs_t *) &buf[i]; | |
1114 | |
1115 qtype = (qs->type_hi << 8) + qs->type_lo; | |
1116 qclass = (qs->class_hi << 8) + qs->class_lo; | |
1117 | |
1118 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1967
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use correct ngx_sprintf() formats
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parents:
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diff
changeset
|
1119 "resolver DNS response qt:%ui cl:%ui", qtype, qclass); |
1649 | 1120 |
1121 if (qclass != 1) { | |
1122 ngx_log_error(r->log_level, r->log, 0, | |
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1123 "unknown query class %ui in DNS response", qclass); |
1649 | 1124 return; |
1125 } | |
1126 | |
1127 switch (qtype) { | |
1128 | |
1129 case NGX_RESOLVE_A: | |
1130 | |
1131 ngx_resolver_process_a(r, buf, n, ident, code, nan, | |
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
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1741
diff
changeset
|
1132 i + sizeof(ngx_resolver_qs_t)); |
1649 | 1133 |
1134 break; | |
1135 | |
1136 case NGX_RESOLVE_PTR: | |
1137 | |
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
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parents:
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diff
changeset
|
1138 ngx_resolver_process_ptr(r, buf, n, ident, code, nan); |
1649 | 1139 |
1140 break; | |
1141 | |
1142 default: | |
1143 ngx_log_error(r->log_level, r->log, 0, | |
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1144 "unknown query type %ui in DNS response", qtype); |
1649 | 1145 return; |
1146 } | |
1147 | |
1148 return; | |
1149 | |
1150 short_response: | |
1151 | |
1152 err = "short dns response"; | |
1153 | |
1154 done: | |
1155 | |
1156 ngx_log_error(r->log_level, r->log, 0, err); | |
1157 | |
1158 return; | |
2282
ec97eb9a8038
show name for a FORMERR DNS response
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diff
changeset
|
1159 |
ec97eb9a8038
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diff
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|
1160 dns_error: |
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show name for a FORMERR DNS response
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diff
changeset
|
1161 |
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diff
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|
1162 ngx_log_error(r->log_level, r->log, 0, |
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show name for a FORMERR DNS response
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diff
changeset
|
1163 "DNS error (%ui: %s), query id:%ui", |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
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diff
changeset
|
1164 code, ngx_resolver_strerror(code), ident); |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
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diff
changeset
|
1165 return; |
1649 | 1166 } |
1167 | |
1168 | |
1169 static void | |
1170 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last, | |
1171 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans) | |
583 | 1172 { |
1649 | 1173 char *err; |
1174 u_char *cname; | |
1175 size_t len; | |
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1176 int32_t ttl; |
1649 | 1177 uint32_t hash; |
1178 in_addr_t addr, *addrs; | |
1179 ngx_str_t name; | |
1180 ngx_uint_t qtype, qident, naddrs, a, i, n, start; | |
1181 ngx_resolver_an_t *an; | |
1182 ngx_resolver_ctx_t *ctx, *next; | |
1183 ngx_resolver_node_t *rn; | |
1184 | |
1185 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) { | |
1186 return; | |
1187 } | |
1188 | |
1189 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); | |
1190 | |
1191 hash = ngx_crc32_short(name.data, name.len); | |
1192 | |
1193 /* lock name mutex */ | |
1194 | |
1195 rn = ngx_resolver_lookup_name(r, &name, hash); | |
1196 | |
1197 if (rn == NULL || rn->query == NULL) { | |
1198 ngx_log_error(r->log_level, r->log, 0, | |
1199 "unexpected response for %V", &name); | |
1200 goto failed; | |
1201 } | |
1202 | |
1203 qident = (rn->query[0] << 8) + rn->query[1]; | |
1204 | |
1205 if (ident != qident) { | |
1206 ngx_log_error(r->log_level, r->log, 0, | |
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1207 "wrong ident %ui response for %V, expect %ui", |
1649 | 1208 ident, &name, qident); |
1209 goto failed; | |
1210 } | |
1211 | |
3139 | 1212 ngx_resolver_free(r, name.data); |
1213 | |
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1214 if (code == 0 && nan == 0) { |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1215 code = 3; /* NXDOMAIN */ |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1216 } |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1217 |
1649 | 1218 if (code) { |
1219 next = rn->waiting; | |
1220 rn->waiting = NULL; | |
1221 | |
1222 ngx_queue_remove(&rn->queue); | |
1223 | |
1224 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
1225 | |
1226 ngx_resolver_free_node(r, rn); | |
1227 | |
1228 /* unlock name mutex */ | |
1229 | |
1230 while (next) { | |
1231 ctx = next; | |
1232 ctx->state = code; | |
1233 next = ctx->next; | |
1234 | |
1235 ctx->handler(ctx); | |
1236 } | |
1237 | |
1238 return; | |
1239 } | |
1240 | |
1241 i = ans; | |
1242 naddrs = 0; | |
1243 addr = 0; | |
1244 addrs = NULL; | |
1245 cname = NULL; | |
1246 qtype = 0; | |
4296
783fd9c38d98
Silenced a warning for some compilers.
Ruslan Ermilov <ru@nginx.com>
parents:
4295
diff
changeset
|
1247 ttl = 0; |
1649 | 1248 |
1249 for (a = 0; a < nan; a++) { | |
1250 | |
1251 start = i; | |
1252 | |
1253 while (i < last) { | |
1254 | |
1255 if (buf[i] & 0xc0) { | |
1256 i += 2; | |
1257 goto found; | |
1258 } | |
1259 | |
1260 if (buf[i] == 0) { | |
1261 i++; | |
1262 goto test_length; | |
1263 } | |
1264 | |
1265 i += 1 + buf[i]; | |
1266 } | |
1267 | |
1268 goto short_response; | |
1269 | |
1270 test_length: | |
1271 | |
1272 if (i - start < 2) { | |
1273 err = "invalid name in dns response"; | |
1274 goto invalid; | |
1275 } | |
1276 | |
1277 found: | |
1278 | |
1279 if (i + sizeof(ngx_resolver_an_t) >= last) { | |
1280 goto short_response; | |
1281 } | |
1282 | |
1283 an = (ngx_resolver_an_t *) &buf[i]; | |
1284 | |
1285 qtype = (an->type_hi << 8) + an->type_lo; | |
1286 len = (an->len_hi << 8) + an->len_lo; | |
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1287 ttl = (an->ttl[0] << 24) + (an->ttl[1] << 16) |
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1288 + (an->ttl[2] << 8) + (an->ttl[3]); |
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1289 |
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1290 if (ttl < 0) { |
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1291 ttl = 0; |
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1292 } |
1649 | 1293 |
1294 if (qtype == NGX_RESOLVE_A) { | |
1295 | |
1296 i += sizeof(ngx_resolver_an_t); | |
1297 | |
1298 if (i + len > last) { | |
1299 goto short_response; | |
1300 } | |
1301 | |
1302 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
1303 + (buf[i + 2] << 8) + (buf[i + 3])); | |
1304 | |
1305 naddrs++; | |
1306 | |
1307 i += len; | |
1308 | |
1309 } else if (qtype == NGX_RESOLVE_CNAME) { | |
1310 cname = &buf[i] + sizeof(ngx_resolver_an_t); | |
1311 i += sizeof(ngx_resolver_an_t) + len; | |
1965 | 1312 |
1313 } else if (qtype == NGX_RESOLVE_DNAME) { | |
1314 i += sizeof(ngx_resolver_an_t) + len; | |
1966 | 1315 |
1316 } else { | |
1317 ngx_log_error(r->log_level, r->log, 0, | |
1318 "unexpected qtype %ui", qtype); | |
1649 | 1319 } |
1320 } | |
1321 | |
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1322 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, |
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1323 "resolver naddrs:%ui cname:%p ttl:%d", |
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1324 naddrs, cname, ttl); |
1649 | 1325 |
1326 if (naddrs) { | |
1327 | |
1328 if (naddrs == 1) { | |
1329 rn->u.addr = addr; | |
1330 | |
1331 } else { | |
1332 | |
1333 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t)); | |
1334 if (addrs == NULL) { | |
1335 return; | |
1336 } | |
1337 | |
1338 n = 0; | |
1339 i = ans; | |
1340 | |
1341 for (a = 0; a < nan; a++) { | |
1342 | |
1343 for ( ;; ) { | |
1344 | |
1345 if (buf[i] & 0xc0) { | |
1346 i += 2; | |
1347 goto ok; | |
1348 } | |
1349 | |
1350 if (buf[i] == 0) { | |
1351 i++; | |
1352 goto ok; | |
1353 } | |
1354 | |
1355 i += 1 + buf[i]; | |
1356 } | |
1357 | |
1358 ok: | |
1359 | |
1360 an = (ngx_resolver_an_t *) &buf[i]; | |
1361 | |
1362 qtype = (an->type_hi << 8) + an->type_lo; | |
1363 len = (an->len_hi << 8) + an->len_lo; | |
1364 | |
1365 i += sizeof(ngx_resolver_an_t); | |
1366 | |
1367 if (qtype == NGX_RESOLVE_A) { | |
1368 | |
1369 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
1370 + (buf[i + 2] << 8) + (buf[i + 3])); | |
1371 | |
1372 if (n == naddrs) { | |
1373 break; | |
1374 } | |
1375 } | |
1376 | |
1377 i += len; | |
1378 } | |
1379 | |
1380 rn->u.addrs = addrs; | |
1381 | |
1382 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
1383 naddrs * sizeof(in_addr_t)); | |
1384 if (addrs == NULL) { | |
1385 return; | |
1386 } | |
1387 } | |
1388 | |
1389 rn->naddrs = (u_short) naddrs; | |
1390 | |
1391 ngx_queue_remove(&rn->queue); | |
1392 | |
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1393 rn->valid = ngx_time() + (r->valid ? r->valid : ttl); |
1649 | 1394 rn->expire = ngx_time() + r->expire; |
1395 | |
1396 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
1397 | |
1398 next = rn->waiting; | |
1399 rn->waiting = NULL; | |
1400 | |
1401 /* unlock name mutex */ | |
1402 | |
1403 while (next) { | |
1404 ctx = next; | |
1405 ctx->state = NGX_OK; | |
1406 ctx->naddrs = naddrs; | |
1407 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
1408 ctx->addr = addr; | |
1409 next = ctx->next; | |
1410 | |
1411 ctx->handler(ctx); | |
1412 } | |
1413 | |
2483
29494780d978
free addrs only it has been allocated before: non single address
Igor Sysoev <igor@sysoev.ru>
parents:
2482
diff
changeset
|
1414 if (naddrs > 1) { |
1649 | 1415 ngx_resolver_free(r, addrs); |
1416 } | |
1417 | |
4619
3171ec7d0d05
Resolver: protection from duplicate responses.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4610
diff
changeset
|
1418 ngx_resolver_free(r, rn->query); |
3171ec7d0d05
Resolver: protection from duplicate responses.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4610
diff
changeset
|
1419 rn->query = NULL; |
3171ec7d0d05
Resolver: protection from duplicate responses.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4610
diff
changeset
|
1420 |
1649 | 1421 return; |
1422 | |
1423 } else if (cname) { | |
1424 | |
1425 /* CNAME only */ | |
1426 | |
1427 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) { | |
1428 return; | |
1429 } | |
1430 | |
1431 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1432 "resolver cname:\"%V\"", &name); | |
1433 | |
1741
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1434 ngx_queue_remove(&rn->queue); |
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1435 |
1649 | 1436 rn->cnlen = (u_short) name.len; |
1437 rn->u.cname = name.data; | |
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1438 |
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1439 rn->valid = ngx_time() + (r->valid ? r->valid : ttl); |
1649 | 1440 rn->expire = ngx_time() + r->expire; |
1441 | |
1442 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
1443 | |
1444 ctx = rn->waiting; | |
1445 rn->waiting = NULL; | |
1446 | |
1447 if (ctx) { | |
1448 ctx->name = name; | |
1449 | |
1450 (void) ngx_resolve_name_locked(r, ctx); | |
1451 } | |
1452 | |
4619
3171ec7d0d05
Resolver: protection from duplicate responses.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4610
diff
changeset
|
1453 ngx_resolver_free(r, rn->query); |
3171ec7d0d05
Resolver: protection from duplicate responses.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4610
diff
changeset
|
1454 rn->query = NULL; |
3171ec7d0d05
Resolver: protection from duplicate responses.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4610
diff
changeset
|
1455 |
1649 | 1456 return; |
1457 } | |
1458 | |
1459 ngx_log_error(r->log_level, r->log, 0, | |
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1460 "no A or CNAME types in DNS responses, unknown query type: %ui", |
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1461 qtype); |
1649 | 1462 return; |
1463 | |
1464 short_response: | |
1465 | |
1466 err = "short dns response"; | |
1467 | |
1468 invalid: | |
1469 | |
1470 /* unlock name mutex */ | |
1471 | |
1472 ngx_log_error(r->log_level, r->log, 0, err); | |
1473 | |
1474 return; | |
1475 | |
1476 failed: | |
1477 | |
1478 /* unlock name mutex */ | |
1479 | |
3139 | 1480 ngx_resolver_free(r, name.data); |
1481 | |
1649 | 1482 return; |
1483 } | |
1484 | |
1485 | |
1486 static void | |
1487 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
|
1488 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan) |
1649 | 1489 { |
1490 char *err; | |
1491 size_t len; | |
1492 in_addr_t addr; | |
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1493 int32_t ttl; |
1649 | 1494 ngx_int_t digit; |
1495 ngx_str_t name; | |
3902
159b58f9c0bd
fix building by gcc 4.6 without --with-debug
Igor Sysoev <igor@sysoev.ru>
parents:
3763
diff
changeset
|
1496 ngx_uint_t i, mask, qident; |
1649 | 1497 ngx_resolver_an_t *an; |
1498 ngx_resolver_ctx_t *ctx, *next; | |
1499 ngx_resolver_node_t *rn; | |
1500 | |
1501 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) { | |
1502 goto invalid_in_addr_arpa; | |
1503 } | |
1504 | |
1505 addr = 0; | |
1506 i = 12; | |
1507 | |
1508 for (mask = 0; mask < 32; mask += 8) { | |
1509 len = buf[i++]; | |
1510 | |
1511 digit = ngx_atoi(&buf[i], len); | |
1512 if (digit == NGX_ERROR || digit > 255) { | |
1513 goto invalid_in_addr_arpa; | |
1514 } | |
1515 | |
1516 addr += digit << mask; | |
1517 i += len; | |
1518 } | |
1519 | |
1520 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) { | |
1521 goto invalid_in_addr_arpa; | |
1522 } | |
1523 | |
1524 /* lock addr mutex */ | |
1525 | |
1526 rn = ngx_resolver_lookup_addr(r, addr); | |
1527 | |
1528 if (rn == NULL || rn->query == NULL) { | |
1529 ngx_log_error(r->log_level, r->log, 0, | |
1530 "unexpected response for %ud.%ud.%ud.%ud", | |
1531 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
1532 (addr >> 8) & 0xff, addr & 0xff); | |
1533 goto failed; | |
1534 } | |
1535 | |
1536 qident = (rn->query[0] << 8) + rn->query[1]; | |
1537 | |
1538 if (ident != qident) { | |
1539 ngx_log_error(r->log_level, r->log, 0, | |
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1540 "wrong ident %ui response for %ud.%ud.%ud.%ud, expect %ui", |
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1541 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff, |
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1542 (addr >> 8) & 0xff, addr & 0xff, qident); |
1649 | 1543 goto failed; |
1544 } | |
1545 | |
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1546 if (code == 0 && nan == 0) { |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1547 code = 3; /* NXDOMAIN */ |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1548 } |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1549 |
1649 | 1550 if (code) { |
1551 next = rn->waiting; | |
1552 rn->waiting = NULL; | |
1553 | |
1554 ngx_queue_remove(&rn->queue); | |
1555 | |
1556 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
1557 | |
1558 ngx_resolver_free_node(r, rn); | |
1559 | |
1560 /* unlock addr mutex */ | |
1561 | |
1562 while (next) { | |
1563 ctx = next; | |
1564 ctx->state = code; | |
1565 next = ctx->next; | |
1566 | |
1567 ctx->handler(ctx); | |
1568 } | |
1569 | |
1570 return; | |
1571 } | |
1572 | |
1573 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t); | |
1574 | |
1575 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) { | |
1576 goto short_response; | |
1577 } | |
1578 | |
1579 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */ | |
1580 | |
1581 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) { | |
1582 err = "invalid in-addr.arpa name in DNS response"; | |
1583 goto invalid; | |
1584 } | |
1585 | |
1586 an = (ngx_resolver_an_t *) &buf[i + 2]; | |
1587 | |
1588 len = (an->len_hi << 8) + an->len_lo; | |
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1589 ttl = (an->ttl[0] << 24) + (an->ttl[1] << 16) |
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1590 + (an->ttl[2] << 8) + (an->ttl[3]); |
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1591 |
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1592 if (ttl < 0) { |
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1593 ttl = 0; |
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1594 } |
1649 | 1595 |
1596 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, | |
3902
159b58f9c0bd
fix building by gcc 4.6 without --with-debug
Igor Sysoev <igor@sysoev.ru>
parents:
3763
diff
changeset
|
1597 "resolver qt:%ui cl:%ui len:%uz", |
159b58f9c0bd
fix building by gcc 4.6 without --with-debug
Igor Sysoev <igor@sysoev.ru>
parents:
3763
diff
changeset
|
1598 (an->type_hi << 8) + an->type_lo, |
159b58f9c0bd
fix building by gcc 4.6 without --with-debug
Igor Sysoev <igor@sysoev.ru>
parents:
3763
diff
changeset
|
1599 (an->class_hi << 8) + an->class_lo, len); |
1649 | 1600 |
1601 i += 2 + sizeof(ngx_resolver_an_t); | |
1602 | |
1603 if (i + len > (ngx_uint_t) n) { | |
1604 goto short_response; | |
1605 } | |
1606 | |
1607 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) { | |
1608 return; | |
1609 } | |
1610 | |
1611 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name); | |
1612 | |
2486
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1613 if (name.len != (size_t) rn->nlen |
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1614 || ngx_strncmp(name.data, rn->name, name.len) != 0) |
1649 | 1615 { |
2482
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1616 if (rn->nlen) { |
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1617 ngx_resolver_free(r, rn->name); |
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1618 } |
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1619 |
2490
1c87647b7ca5
fix building by msvc, introduced in r2487
Igor Sysoev <igor@sysoev.ru>
parents:
2487
diff
changeset
|
1620 rn->nlen = (u_short) name.len; |
1649 | 1621 rn->name = name.data; |
1622 | |
2486
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1623 name.data = ngx_resolver_dup(r, rn->name, name.len); |
1649 | 1624 if (name.data == NULL) { |
1625 goto failed; | |
1626 } | |
1627 } | |
1628 | |
1629 ngx_queue_remove(&rn->queue); | |
1630 | |
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1631 rn->valid = ngx_time() + (r->valid ? r->valid : ttl); |
1649 | 1632 rn->expire = ngx_time() + r->expire; |
1633 | |
1634 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
1635 | |
1636 next = rn->waiting; | |
1637 rn->waiting = NULL; | |
1638 | |
1639 /* unlock addr mutex */ | |
1640 | |
1641 while (next) { | |
1642 ctx = next; | |
1643 ctx->state = NGX_OK; | |
1644 ctx->name = name; | |
1645 next = ctx->next; | |
1646 | |
1647 ctx->handler(ctx); | |
1648 } | |
1649 | |
1650 ngx_resolver_free(r, name.data); | |
1651 | |
1652 return; | |
1653 | |
1654 invalid_in_addr_arpa: | |
1655 | |
1656 ngx_log_error(r->log_level, r->log, 0, | |
1657 "invalid in-addr.arpa name in DNS response"); | |
1658 return; | |
1659 | |
1660 short_response: | |
1661 | |
1662 err = "short DNS response"; | |
1663 | |
1664 invalid: | |
1665 | |
1666 /* unlock addr mutex */ | |
1667 | |
1668 ngx_log_error(r->log_level, r->log, 0, err); | |
1669 | |
1670 return; | |
1671 | |
1672 failed: | |
1673 | |
1674 /* unlock addr mutex */ | |
1675 | |
1676 return; | |
1677 } | |
1678 | |
1679 | |
1680 static ngx_resolver_node_t * | |
1681 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) | |
1682 { | |
1683 ngx_int_t rc; | |
1684 ngx_rbtree_node_t *node, *sentinel; | |
1685 ngx_resolver_node_t *rn; | |
1686 | |
1687 node = r->name_rbtree.root; | |
1688 sentinel = r->name_rbtree.sentinel; | |
1689 | |
1690 while (node != sentinel) { | |
1691 | |
1692 if (hash < node->key) { | |
1693 node = node->left; | |
1694 continue; | |
1695 } | |
1696 | |
1697 if (hash > node->key) { | |
1698 node = node->right; | |
1699 continue; | |
1700 } | |
1701 | |
1702 /* hash == node->key */ | |
1703 | |
4497
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1704 rn = (ngx_resolver_node_t *) node; |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1705 |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1706 rc = ngx_memn2cmp(name->data, rn->name, name->len, rn->nlen); |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1707 |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1708 if (rc == 0) { |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1709 return rn; |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1710 } |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1711 |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1712 node = (rc < 0) ? node->left : node->right; |
1649 | 1713 } |
1714 | |
1715 /* not found */ | |
1716 | |
1717 return NULL; | |
1718 } | |
1719 | |
1720 | |
1721 static ngx_resolver_node_t * | |
1722 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr) | |
1723 { | |
1724 ngx_rbtree_node_t *node, *sentinel; | |
1725 | |
1726 node = r->addr_rbtree.root; | |
1727 sentinel = r->addr_rbtree.sentinel; | |
1728 | |
1729 while (node != sentinel) { | |
1730 | |
1731 if (addr < node->key) { | |
1732 node = node->left; | |
1733 continue; | |
1734 } | |
1735 | |
1736 if (addr > node->key) { | |
1737 node = node->right; | |
1738 continue; | |
1739 } | |
1740 | |
1741 /* addr == node->key */ | |
1742 | |
1743 return (ngx_resolver_node_t *) node; | |
1744 } | |
1745 | |
1746 /* not found */ | |
1747 | |
1748 return NULL; | |
1749 } | |
1750 | |
1751 | |
1752 static void | |
1753 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
1754 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
1755 { | |
1756 ngx_rbtree_node_t **p; | |
1757 ngx_resolver_node_t *rn, *rn_temp; | |
1758 | |
1759 for ( ;; ) { | |
1760 | |
1761 if (node->key < temp->key) { | |
1762 | |
1763 p = &temp->left; | |
1764 | |
1765 } else if (node->key > temp->key) { | |
1766 | |
1767 p = &temp->right; | |
1768 | |
1769 } else { /* node->key == temp->key */ | |
1770 | |
1771 rn = (ngx_resolver_node_t *) node; | |
1772 rn_temp = (ngx_resolver_node_t *) temp; | |
1773 | |
3143
ab6258e18099
fix resolver cache rbtree comparison
Igor Sysoev <igor@sysoev.ru>
parents:
3139
diff
changeset
|
1774 p = (ngx_memn2cmp(rn->name, rn_temp->name, rn->nlen, rn_temp->nlen) |
ab6258e18099
fix resolver cache rbtree comparison
Igor Sysoev <igor@sysoev.ru>
parents:
3139
diff
changeset
|
1775 < 0) ? &temp->left : &temp->right; |
1649 | 1776 } |
1777 | |
1778 if (*p == sentinel) { | |
1779 break; | |
1780 } | |
1781 | |
1782 temp = *p; | |
1783 } | |
1784 | |
1785 *p = node; | |
1786 node->parent = temp; | |
1787 node->left = sentinel; | |
1788 node->right = sentinel; | |
1789 ngx_rbt_red(node); | |
1790 } | |
1791 | |
1792 | |
1793 static ngx_int_t | |
1794 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
1795 { | |
1796 u_char *p, *s; | |
3306
61bdaac6c668
fix resolving an empty name (".")
Igor Sysoev <igor@sysoev.ru>
parents:
3299
diff
changeset
|
1797 size_t len, nlen; |
1649 | 1798 ngx_uint_t ident; |
1799 ngx_resolver_qs_t *qs; | |
1800 ngx_resolver_query_t *query; | |
1801 | |
3306
61bdaac6c668
fix resolving an empty name (".")
Igor Sysoev <igor@sysoev.ru>
parents:
3299
diff
changeset
|
1802 nlen = ctx->name.len ? (1 + ctx->name.len + 1) : 1; |
61bdaac6c668
fix resolving an empty name (".")
Igor Sysoev <igor@sysoev.ru>
parents:
3299
diff
changeset
|
1803 |
61bdaac6c668
fix resolving an empty name (".")
Igor Sysoev <igor@sysoev.ru>
parents:
3299
diff
changeset
|
1804 len = sizeof(ngx_resolver_query_t) + nlen + sizeof(ngx_resolver_qs_t); |
1649 | 1805 |
3307
34e99a97fbd6
use ngx_resolver_alloc() instead of ngx_resolver_calloc()
Igor Sysoev <igor@sysoev.ru>
parents:
3306
diff
changeset
|
1806 p = ngx_resolver_alloc(ctx->resolver, len); |
1649 | 1807 if (p == NULL) { |
1808 return NGX_ERROR; | |
1809 } | |
1810 | |
1811 rn->qlen = (u_short) len; | |
1812 rn->query = p; | |
1813 | |
1814 query = (ngx_resolver_query_t *) p; | |
1815 | |
1816 ident = ngx_random(); | |
1817 | |
1818 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0, | |
1819 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff); | |
1820 | |
1821 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
1822 query->ident_lo = (u_char) (ident & 0xff); | |
1823 | |
1824 /* recursion query */ | |
1825 query->flags_hi = 1; query->flags_lo = 0; | |
1826 | |
1827 /* one question */ | |
1828 query->nqs_hi = 0; query->nqs_lo = 1; | |
1829 query->nan_hi = 0; query->nan_lo = 0; | |
1830 query->nns_hi = 0; query->nns_lo = 0; | |
1831 query->nar_hi = 0; query->nar_lo = 0; | |
1832 | |
3306
61bdaac6c668
fix resolving an empty name (".")
Igor Sysoev <igor@sysoev.ru>
parents:
3299
diff
changeset
|
1833 p += sizeof(ngx_resolver_query_t) + nlen; |
1649 | 1834 |
1835 qs = (ngx_resolver_qs_t *) p; | |
1836 | |
1837 /* query type */ | |
1838 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type; | |
1839 | |
1840 /* IP query class */ | |
1841 qs->class_hi = 0; qs->class_lo = 1; | |
1842 | |
1843 /* convert "www.example.com" to "\3www\7example\3com\0" */ | |
1844 | |
1845 len = 0; | |
1846 p--; | |
1847 *p-- = '\0'; | |
1848 | |
4610
778d2cc03e22
Fixed segmentation fault in ngx_resolver_create_name_query().
Ruslan Ermilov <ru@nginx.com>
parents:
4556
diff
changeset
|
1849 if (ctx->name.len == 0) { |
778d2cc03e22
Fixed segmentation fault in ngx_resolver_create_name_query().
Ruslan Ermilov <ru@nginx.com>
parents:
4556
diff
changeset
|
1850 return NGX_DECLINED; |
778d2cc03e22
Fixed segmentation fault in ngx_resolver_create_name_query().
Ruslan Ermilov <ru@nginx.com>
parents:
4556
diff
changeset
|
1851 } |
778d2cc03e22
Fixed segmentation fault in ngx_resolver_create_name_query().
Ruslan Ermilov <ru@nginx.com>
parents:
4556
diff
changeset
|
1852 |
1649 | 1853 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) { |
1854 if (*s != '.') { | |
1855 *p = *s; | |
1856 len++; | |
1857 | |
1858 } else { | |
4556
1bddc91e78d6
Resolver: added missing sanity checking when creating name queries.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4497
diff
changeset
|
1859 if (len == 0 || len > 255) { |
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
1860 return NGX_DECLINED; |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
1861 } |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
1862 |
1649 | 1863 *p = (u_char) len; |
1864 len = 0; | |
1865 } | |
1866 | |
1867 p--; | |
1868 } | |
1869 | |
4556
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1870 if (len == 0 || len > 255) { |
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1871 return NGX_DECLINED; |
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1872 } |
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1873 |
1649 | 1874 *p = (u_char) len; |
1875 | |
1876 return NGX_OK; | |
1877 } | |
1878 | |
1879 | |
1880 /* AF_INET only */ | |
1881 | |
1882 static ngx_int_t | |
1883 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
1884 { | |
1885 u_char *p, *d; | |
1886 size_t len; | |
1887 ngx_int_t n; | |
1888 ngx_uint_t ident; | |
1889 ngx_resolver_query_t *query; | |
1890 | |
1891 len = sizeof(ngx_resolver_query_t) | |
1892 + sizeof(".255.255.255.255.in-addr.arpa.") - 1 | |
1893 + sizeof(ngx_resolver_qs_t); | |
1894 | |
3307
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1895 p = ngx_resolver_alloc(ctx->resolver, len); |
1649 | 1896 if (p == NULL) { |
1897 return NGX_ERROR; | |
1898 } | |
1899 | |
1900 rn->query = p; | |
1901 query = (ngx_resolver_query_t *) p; | |
1902 | |
1903 ident = ngx_random(); | |
1904 | |
1905 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
1906 query->ident_lo = (u_char) (ident & 0xff); | |
1907 | |
1908 /* recursion query */ | |
1909 query->flags_hi = 1; query->flags_lo = 0; | |
1910 | |
1911 /* one question */ | |
1912 query->nqs_hi = 0; query->nqs_lo = 1; | |
1913 query->nan_hi = 0; query->nan_lo = 0; | |
1914 query->nns_hi = 0; query->nns_lo = 0; | |
1915 query->nar_hi = 0; query->nar_lo = 0; | |
1916 | |
1917 p += sizeof(ngx_resolver_query_t); | |
1918 | |
3642 | 1919 for (n = 0; n < 32; n += 8) { |
1649 | 1920 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff); |
1921 *p = (u_char) (d - &p[1]); | |
1922 p = d; | |
1923 } | |
1924 | |
1925 /* query type "PTR", IP query class */ | |
1926 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18); | |
1927 | |
1928 rn->qlen = (u_short) | |
1929 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t) | |
1930 - rn->query); | |
1931 | |
1932 return NGX_OK; | |
1933 } | |
1934 | |
1935 | |
1936 static ngx_int_t | |
1937 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src, | |
1938 u_char *last) | |
1939 { | |
1940 char *err; | |
1941 u_char *p, *dst; | |
1942 ssize_t len; | |
1943 ngx_uint_t i, n; | |
1944 | |
1945 p = src; | |
1946 len = -1; | |
1947 | |
1948 /* | |
1949 * compression pointers allow to create endless loop, so we set limit; | |
1950 * 128 pointers should be enough to store 255-byte name | |
1951 */ | |
1952 | |
1953 for (i = 0; i < 128; i++) { | |
1954 n = *p++; | |
1955 | |
1956 if (n == 0) { | |
1957 goto done; | |
1958 } | |
1959 | |
1960 if (n & 0xc0) { | |
2314
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1961 n = ((n & 0x3f) << 8) + *p; |
1649 | 1962 p = &buf[n]; |
1963 | |
1964 } else { | |
1965 len += 1 + n; | |
1966 p = &p[n]; | |
1967 } | |
1968 | |
1969 if (p >= last) { | |
1970 err = "name is out of response"; | |
1971 goto invalid; | |
1972 } | |
1973 } | |
1974 | |
1975 err = "compression pointers loop"; | |
1976 | |
1977 invalid: | |
1978 | |
1979 ngx_log_error(r->log_level, r->log, 0, err); | |
1980 | |
1981 return NGX_ERROR; | |
1982 | |
1983 done: | |
1984 | |
1985 if (name == NULL) { | |
583 | 1986 return NGX_OK; |
1987 } | |
1988 | |
3298
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1989 if (len == -1) { |
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1990 name->len = 0; |
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1991 name->data = NULL; |
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1992 return NGX_OK; |
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1993 } |
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|
1994 |
1649 | 1995 dst = ngx_resolver_alloc(r, len); |
1996 if (dst == NULL) { | |
1997 return NGX_ERROR; | |
1998 } | |
1999 | |
2000 name->data = dst; | |
2001 | |
2002 n = *src++; | |
2003 | |
2004 for ( ;; ) { | |
4267
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2005 if (n & 0xc0) { |
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2006 n = ((n & 0x3f) << 8) + *src; |
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2007 src = &buf[n]; |
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|
2008 |
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|
2009 n = *src++; |
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|
2010 |
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2011 } else { |
1649 | 2012 ngx_memcpy(dst, src, n); |
2013 dst += n; | |
2014 src += n; | |
2015 | |
2016 n = *src++; | |
2017 | |
2018 if (n != 0) { | |
2019 *dst++ = '.'; | |
2020 } | |
2021 } | |
2022 | |
2023 if (n == 0) { | |
2024 name->len = dst - name->data; | |
2025 return NGX_OK; | |
2026 } | |
2027 } | |
2028 } | |
2029 | |
2030 | |
2031 static void | |
2032 ngx_resolver_timeout_handler(ngx_event_t *ev) | |
2033 { | |
2034 ngx_resolver_ctx_t *ctx; | |
2035 | |
2036 ctx = ev->data; | |
2037 | |
2038 ctx->state = NGX_RESOLVE_TIMEDOUT; | |
2039 | |
2040 ctx->handler(ctx); | |
2041 } | |
2042 | |
2043 | |
2044 static void | |
2045 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
2046 { | |
2047 /* lock alloc mutex */ | |
2048 | |
2049 if (rn->query) { | |
2050 ngx_resolver_free_locked(r, rn->query); | |
2051 } | |
2052 | |
2053 if (rn->name) { | |
2054 ngx_resolver_free_locked(r, rn->name); | |
2055 } | |
2056 | |
2057 if (rn->cnlen) { | |
2058 ngx_resolver_free_locked(r, rn->u.cname); | |
2059 } | |
2060 | |
2061 if (rn->naddrs > 1) { | |
2062 ngx_resolver_free_locked(r, rn->u.addrs); | |
2063 } | |
2064 | |
2065 ngx_resolver_free_locked(r, rn); | |
2066 | |
2067 /* unlock alloc mutex */ | |
2068 } | |
2069 | |
2070 | |
2071 static void * | |
2072 ngx_resolver_alloc(ngx_resolver_t *r, size_t size) | |
2073 { | |
2074 u_char *p; | |
2075 | |
2076 /* lock alloc mutex */ | |
2077 | |
2078 p = ngx_alloc(size, r->log); | |
2079 | |
2080 /* unlock alloc mutex */ | |
2081 | |
2082 return p; | |
2083 } | |
2084 | |
2085 | |
1903 | 2086 static void * |
1649 | 2087 ngx_resolver_calloc(ngx_resolver_t *r, size_t size) |
2088 { | |
2089 u_char *p; | |
2090 | |
2091 p = ngx_resolver_alloc(r, size); | |
2092 | |
2093 if (p) { | |
2094 ngx_memzero(p, size); | |
2095 } | |
2096 | |
2097 return p; | |
2098 } | |
2099 | |
2100 | |
2101 static void | |
2102 ngx_resolver_free(ngx_resolver_t *r, void *p) | |
2103 { | |
2104 /* lock alloc mutex */ | |
2105 | |
2106 ngx_free(p); | |
2107 | |
2108 /* unlock alloc mutex */ | |
2109 } | |
2110 | |
2111 | |
2112 static void | |
2113 ngx_resolver_free_locked(ngx_resolver_t *r, void *p) | |
2114 { | |
2115 ngx_free(p); | |
2116 } | |
2117 | |
2118 | |
2119 static void * | |
2120 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size) | |
2121 { | |
2122 void *dst; | |
2123 | |
2124 dst = ngx_resolver_alloc(r, size); | |
2125 | |
2126 if (dst == NULL) { | |
2127 return dst; | |
2128 } | |
2129 | |
2130 ngx_memcpy(dst, src, size); | |
2131 | |
2132 return dst; | |
2133 } | |
2134 | |
2135 | |
2136 char * | |
2137 ngx_resolver_strerror(ngx_int_t err) | |
2138 { | |
2139 static char *errors[] = { | |
2140 "Format error", /* FORMERR */ | |
2141 "Server failure", /* SERVFAIL */ | |
2142 "Host not found", /* NXDOMAIN */ | |
2143 "Unimplemented", /* NOTIMP */ | |
2144 "Operation refused" /* REFUSED */ | |
2145 }; | |
2146 | |
2147 if (err > 0 && err < 6) { | |
2148 return errors[err - 1]; | |
2149 } | |
2150 | |
2151 if (err == NGX_RESOLVE_TIMEDOUT) { | |
2152 return "Operation timed out"; | |
2153 } | |
2154 | |
2155 return "Unknown error"; | |
2156 } | |
2157 | |
2158 | |
3408
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2159 static u_char * |
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2160 ngx_resolver_log_error(ngx_log_t *log, u_char *buf, size_t len) |
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2161 { |
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2162 u_char *p; |
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2163 ngx_udp_connection_t *uc; |
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2164 |
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2165 p = buf; |
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2166 |
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2167 if (log->action) { |
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|
2168 p = ngx_snprintf(buf, len, " while %s", log->action); |
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2169 len -= p - buf; |
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|
2170 } |
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2171 |
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2172 uc = log->data; |
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2173 |
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2174 if (uc) { |
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2175 p = ngx_snprintf(p, len, ", resolver: %V", &uc->server); |
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2176 } |
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2177 |
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2178 return p; |
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|
2179 } |
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2180 |
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2181 |
1649 | 2182 ngx_int_t |
2183 ngx_udp_connect(ngx_udp_connection_t *uc) | |
2184 { | |
2185 int rc; | |
2186 ngx_int_t event; | |
2187 ngx_event_t *rev, *wev; | |
2188 ngx_socket_t s; | |
2189 ngx_connection_t *c; | |
2190 | |
4671
af9342747669
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Ruslan Ermilov <ru@nginx.com>
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2191 s = ngx_socket(uc->sockaddr->sa_family, SOCK_DGRAM, 0); |
583 | 2192 |
3408
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2193 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, &uc->log, 0, "UDP socket %d", s); |
583 | 2194 |
2195 if (s == -1) { | |
3408
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2196 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
583 | 2197 ngx_socket_n " failed"); |
2198 return NGX_ERROR; | |
2199 } | |
2200 | |
3408
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2201 c = ngx_get_connection(s, &uc->log); |
583 | 2202 |
2203 if (c == NULL) { | |
2204 if (ngx_close_socket(s) == -1) { | |
3408
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2205 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
583 | 2206 ngx_close_socket_n "failed"); |
2207 } | |
2208 | |
2209 return NGX_ERROR; | |
2210 } | |
2211 | |
1649 | 2212 if (ngx_nonblocking(s) == -1) { |
3408
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2213 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
1649 | 2214 ngx_nonblocking_n " failed"); |
2215 | |
2216 ngx_free_connection(c); | |
2217 | |
2218 if (ngx_close_socket(s) == -1) { | |
3408
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2219 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
1649 | 2220 ngx_close_socket_n " failed"); |
2221 } | |
2222 | |
2223 return NGX_ERROR; | |
2224 } | |
2225 | |
583 | 2226 rev = c->read; |
2227 wev = c->write; | |
2228 | |
3408
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2229 rev->log = &uc->log; |
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2230 wev->log = &uc->log; |
1649 | 2231 |
2232 uc->connection = c; | |
583 | 2233 |
2234 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); | |
2235 | |
2236 #if (NGX_THREADS) | |
1649 | 2237 |
2238 /* TODO: lock event when call completion handler */ | |
2239 | |
2240 rev->lock = &c->lock; | |
2241 wev->lock = &c->lock; | |
583 | 2242 rev->own_lock = &c->lock; |
2243 wev->own_lock = &c->lock; | |
1649 | 2244 |
583 | 2245 #endif |
2246 | |
3408
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2247 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, &uc->log, 0, |
1649 | 2248 "connect to %V, fd:%d #%d", &uc->server, s, c->number); |
2249 | |
2250 rc = connect(s, uc->sockaddr, uc->socklen); | |
2251 | |
2252 /* TODO: aio, iocp */ | |
583 | 2253 |
2254 if (rc == -1) { | |
3408
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2255 ngx_log_error(NGX_LOG_CRIT, &uc->log, ngx_socket_errno, |
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2256 "connect() failed"); |
583 | 2257 |
2258 return NGX_ERROR; | |
2259 } | |
2260 | |
1649 | 2261 /* UDP sockets are always ready to write */ |
2262 wev->ready = 1; | |
2263 | |
2264 if (ngx_add_event) { | |
2265 | |
2266 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ? | |
2267 /* kqueue, epoll */ NGX_CLEAR_EVENT: | |
2268 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT; | |
2269 /* eventport event type has no meaning: oneshot only */ | |
2270 | |
2271 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { | |
2272 return NGX_ERROR; | |
2273 } | |
2274 | |
2275 } else { | |
2276 /* rtsig */ | |
2277 | |
583 | 2278 if (ngx_add_conn(c) == NGX_ERROR) { |
2279 return NGX_ERROR; | |
2280 } | |
2281 } | |
2282 | |
2283 return NGX_OK; | |
2284 } |