Mercurial > hg > nginx
annotate src/core/ngx_resolver.c @ 4412:d620f497c50f
Copyright updated.
author | Maxim Konovalov <maxim@nginx.com> |
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date | Wed, 18 Jan 2012 15:07:43 +0000 |
parents | 783fd9c38d98 |
children | 41f640a693de |
rev | line source |
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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, | |
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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 |
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163 if (r->valid == 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.host = names[i]; |
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175 u.port = 53; |
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176 |
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177 if (ngx_inet_resolve_host(cf->pool, &u) != NGX_OK) { |
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178 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%V: %s", &u.host, u.err); |
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179 return NULL; |
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180 } |
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181 |
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182 uc = ngx_array_push(&r->udp_connections); |
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183 if (uc == NULL) { |
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184 return NULL; |
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185 } |
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186 |
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187 ngx_memzero(uc, sizeof(ngx_udp_connection_t)); |
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188 |
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189 uc->sockaddr = u.addrs->sockaddr; |
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190 uc->socklen = u.addrs->socklen; |
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191 uc->server = u.addrs->name; |
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192 |
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193 uc->log = cf->cycle->new_log; |
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194 uc->log.handler = ngx_resolver_log_error; |
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195 uc->log.data = uc; |
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196 uc->log.action = "resolving"; |
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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) { | |
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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.
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parents:
3902
diff
changeset
|
287 if (r->udp_connections.nelts == 0) { |
1683
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allow to use IP addresses without defined resolver
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diff
changeset
|
288 return NGX_NO_RESOLVER; |
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allow to use IP addresses without defined resolver
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1679
diff
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|
289 } |
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allow to use IP addresses without defined resolver
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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
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parents:
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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 | |
521 ngx_resolver_free_locked(r, rn->query); | |
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
522 rn->query = NULL; |
1649 | 523 |
524 if (rn->cnlen) { | |
525 ngx_resolver_free_locked(r, rn->u.cname); | |
526 } | |
527 | |
528 if (rn->naddrs > 1) { | |
529 ngx_resolver_free_locked(r, rn->u.addrs); | |
530 } | |
531 | |
532 /* unlock alloc mutex */ | |
533 | |
534 } else { | |
535 | |
536 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
537 if (rn == NULL) { | |
538 return NGX_ERROR; | |
539 } | |
540 | |
541 rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len); | |
542 if (rn->name == NULL) { | |
543 ngx_resolver_free(r, rn); | |
544 return NGX_ERROR; | |
545 } | |
546 | |
547 rn->node.key = hash; | |
548 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
|
549 rn->query = NULL; |
1649 | 550 |
551 ngx_rbtree_insert(&r->name_rbtree, &rn->node); | |
552 } | |
553 | |
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
554 rc = ngx_resolver_create_name_query(rn, ctx); |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
555 |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
556 if (rc == NGX_ERROR) { |
1649 | 557 goto failed; |
558 } | |
559 | |
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
560 if (rc == NGX_DECLINED) { |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
561 ngx_rbtree_delete(&r->name_rbtree, &rn->node); |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
562 |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
563 ngx_resolver_free(r, rn->query); |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
564 ngx_resolver_free(r, rn->name); |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
565 ngx_resolver_free(r, rn); |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
566 |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
567 ctx->state = NGX_RESOLVE_NXDOMAIN; |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
568 ctx->handler(ctx); |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
569 |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
570 return NGX_OK; |
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 |
1649 | 573 if (ngx_resolver_send_query(r, rn) != NGX_OK) { |
574 goto failed; | |
575 } | |
576 | |
577 if (ctx->event == NULL) { | |
578 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
579 if (ctx->event == NULL) { | |
580 goto failed; | |
581 } | |
582 | |
583 ctx->event->handler = ngx_resolver_timeout_handler; | |
584 ctx->event->data = ctx; | |
585 ctx->event->log = r->log; | |
586 ctx->ident = -1; | |
587 | |
588 ngx_add_timer(ctx->event, ctx->timeout); | |
589 } | |
590 | |
591 if (ngx_queue_empty(&r->name_resend_queue)) { | |
592 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
593 } | |
594 | |
595 rn->expire = ngx_time() + r->resend_timeout; | |
596 | |
597 ngx_queue_insert_head(&r->name_resend_queue, &rn->queue); | |
598 | |
599 rn->cnlen = 0; | |
600 rn->naddrs = 0; | |
601 rn->valid = 0; | |
602 rn->waiting = ctx; | |
603 | |
604 ctx->state = NGX_AGAIN; | |
605 | |
606 return NGX_AGAIN; | |
607 | |
608 failed: | |
609 | |
610 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
611 | |
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
612 if (rn->query) { |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
613 ngx_resolver_free(r, rn->query); |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
614 } |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
615 |
1649 | 616 ngx_resolver_free(r, rn->name); |
617 | |
618 ngx_resolver_free(r, rn); | |
619 | |
620 return NGX_ERROR; | |
621 } | |
583 | 622 |
623 | |
624 ngx_int_t | |
1649 | 625 ngx_resolve_addr(ngx_resolver_ctx_t *ctx) |
626 { | |
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
627 u_char *name; |
1649 | 628 ngx_resolver_t *r; |
629 ngx_resolver_node_t *rn; | |
630 | |
631 r = ctx->resolver; | |
632 | |
633 ctx->addr = ntohl(ctx->addr); | |
634 | |
635 /* lock addr mutex */ | |
636 | |
637 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
638 | |
639 if (rn) { | |
640 | |
641 if (rn->valid >= ngx_time()) { | |
642 | |
643 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
644 | |
645 ngx_queue_remove(&rn->queue); | |
646 | |
647 rn->expire = ngx_time() + r->expire; | |
648 | |
649 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
650 | |
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
651 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
|
652 if (name == NULL) { |
1649 | 653 goto failed; |
654 } | |
655 | |
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
656 ctx->name.len = rn->nlen; |
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
657 ctx->name.data = name; |
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
658 |
1649 | 659 /* unlock addr mutex */ |
660 | |
661 ctx->state = NGX_OK; | |
662 | |
663 ctx->handler(ctx); | |
664 | |
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
665 ngx_resolver_free(r, name); |
1649 | 666 |
667 return NGX_OK; | |
668 } | |
669 | |
670 if (rn->waiting) { | |
671 | |
672 ctx->next = rn->waiting; | |
673 rn->waiting = ctx; | |
3297 | 674 ctx->state = NGX_AGAIN; |
1649 | 675 |
2487
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
676 /* unlock addr mutex */ |
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
677 |
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
678 return NGX_OK; |
1649 | 679 } |
680 | |
681 ngx_queue_remove(&rn->queue); | |
682 | |
683 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
|
684 rn->query = NULL; |
1649 | 685 |
686 } else { | |
687 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
688 if (rn == NULL) { | |
689 goto failed; | |
690 } | |
691 | |
692 rn->node.key = ctx->addr; | |
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
693 rn->query = NULL; |
1649 | 694 |
695 ngx_rbtree_insert(&r->addr_rbtree, &rn->node); | |
696 } | |
697 | |
698 if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) { | |
699 goto failed; | |
700 } | |
701 | |
702 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
703 goto failed; | |
704 } | |
705 | |
706 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
707 if (ctx->event == NULL) { | |
708 goto failed; | |
709 } | |
710 | |
711 ctx->event->handler = ngx_resolver_timeout_handler; | |
712 ctx->event->data = ctx; | |
713 ctx->event->log = r->log; | |
714 ctx->ident = -1; | |
715 | |
716 ngx_add_timer(ctx->event, ctx->timeout); | |
717 | |
718 if (ngx_queue_empty(&r->addr_resend_queue)) { | |
719 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
720 } | |
721 | |
722 rn->expire = ngx_time() + r->resend_timeout; | |
723 | |
724 ngx_queue_insert_head(&r->addr_resend_queue, &rn->queue); | |
725 | |
726 rn->cnlen = 0; | |
727 rn->naddrs = 0; | |
728 rn->name = NULL; | |
729 rn->nlen = 0; | |
730 rn->valid = 0; | |
731 rn->waiting = ctx; | |
732 | |
733 /* unlock addr mutex */ | |
734 | |
735 ctx->state = NGX_AGAIN; | |
736 | |
737 return NGX_OK; | |
738 | |
739 failed: | |
740 | |
741 if (rn) { | |
742 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
743 | |
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
744 if (rn->query) { |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
745 ngx_resolver_free(r, rn->query); |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
746 } |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
747 |
1649 | 748 ngx_resolver_free(r, rn); |
749 } | |
750 | |
751 /* unlock addr mutex */ | |
752 | |
753 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
|
754 ngx_resolver_free(r, ctx->event); |
1649 | 755 } |
756 | |
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
757 ngx_resolver_free(r, ctx); |
1649 | 758 |
759 return NGX_ERROR; | |
760 } | |
761 | |
762 | |
763 void | |
764 ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx) | |
765 { | |
766 in_addr_t addr; | |
767 ngx_resolver_t *r; | |
768 ngx_resolver_ctx_t *w, **p; | |
769 ngx_resolver_node_t *rn; | |
770 | |
771 r = ctx->resolver; | |
772 | |
773 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
774 "resolve addr done: %i", ctx->state); | |
775 | |
776 if (ctx->event && ctx->event->timer_set) { | |
777 ngx_del_timer(ctx->event); | |
778 } | |
779 | |
780 /* lock addr mutex */ | |
781 | |
782 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
783 | |
784 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
785 | |
786 if (rn) { | |
787 p = &rn->waiting; | |
788 w = rn->waiting; | |
789 | |
790 while (w) { | |
791 if (w == ctx) { | |
792 *p = w->next; | |
793 | |
794 goto done; | |
795 } | |
796 | |
797 p = &w->next; | |
798 w = w->next; | |
799 } | |
800 } | |
801 | |
802 addr = ntohl(ctx->addr); | |
803 | |
804 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
805 "could not cancel %ud.%ud.%ud.%ud resolving", | |
806 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
807 (addr >> 8) & 0xff, addr & 0xff); | |
808 } | |
809 | |
810 done: | |
811 | |
812 ngx_resolver_expire(r, &r->addr_rbtree, &r->addr_expire_queue); | |
813 | |
814 /* unlock addr mutex */ | |
815 | |
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
816 /* 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
|
817 |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
818 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
|
819 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
|
820 } |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
821 |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
822 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
|
823 |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
824 /* unlock alloc mutex */ |
1649 | 825 } |
826 | |
827 | |
828 static void | |
829 ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
830 { | |
831 time_t now; | |
832 ngx_uint_t i; | |
833 ngx_queue_t *q; | |
834 ngx_resolver_node_t *rn; | |
835 | |
836 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire"); | |
837 | |
838 now = ngx_time(); | |
839 | |
840 for (i = 0; i < 2; i++) { | |
841 if (ngx_queue_empty(queue)) { | |
842 return; | |
843 } | |
844 | |
845 q = ngx_queue_last(queue); | |
846 | |
847 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
848 | |
849 if (now <= rn->expire) { | |
850 return; | |
851 } | |
852 | |
1774 | 853 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, |
854 "resolver expire \"%*s\"", (size_t) rn->nlen, rn->name); | |
1649 | 855 |
856 ngx_queue_remove(q); | |
857 | |
858 ngx_rbtree_delete(tree, &rn->node); | |
859 | |
860 ngx_resolver_free_node(r, rn); | |
861 } | |
862 } | |
863 | |
864 | |
865 static ngx_int_t | |
866 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
867 { | |
868 ssize_t n; | |
869 ngx_udp_connection_t *uc; | |
870 | |
4225
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
871 uc = r->udp_connections.elts; |
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
872 |
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
873 uc = &uc[r->last_connection++]; |
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
874 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
|
875 r->last_connection = 0; |
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
876 } |
1649 | 877 |
878 if (uc->connection == NULL) { | |
879 if (ngx_udp_connect(uc) != NGX_OK) { | |
880 return NGX_ERROR; | |
881 } | |
882 | |
883 uc->connection->data = r; | |
884 uc->connection->read->handler = ngx_resolver_read_response; | |
1906 | 885 uc->connection->read->resolver = 1; |
1649 | 886 } |
887 | |
888 n = ngx_send(uc->connection, rn->query, rn->qlen); | |
889 | |
890 if (n == -1) { | |
891 return NGX_ERROR; | |
892 } | |
893 | |
894 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
|
895 ngx_log_error(NGX_LOG_CRIT, &uc->log, 0, "send() incomplete"); |
1649 | 896 return NGX_ERROR; |
897 } | |
898 | |
899 return NGX_OK; | |
900 } | |
901 | |
902 | |
903 static void | |
904 ngx_resolver_resend_handler(ngx_event_t *ev) | |
905 { | |
906 time_t timer, atimer, ntimer; | |
907 ngx_resolver_t *r; | |
908 | |
909 r = ev->data; | |
910 | |
911 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, | |
912 "resolver resend handler"); | |
913 | |
914 /* lock name mutex */ | |
915 | |
916 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue); | |
917 | |
918 /* unlock name mutex */ | |
919 | |
920 /* lock addr mutex */ | |
921 | |
922 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
|
923 |
1649 | 924 /* unlock addr mutex */ |
925 | |
926 if (ntimer == 0) { | |
927 timer = atimer; | |
928 | |
929 } else if (atimer == 0) { | |
930 timer = ntimer; | |
931 | |
932 } else { | |
933 timer = (atimer < ntimer) ? atimer : ntimer; | |
934 } | |
935 | |
936 if (timer) { | |
937 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000)); | |
938 } | |
939 } | |
940 | |
941 | |
942 static time_t | |
943 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
944 { | |
945 time_t now; | |
946 ngx_queue_t *q; | |
947 ngx_resolver_node_t *rn; | |
948 | |
949 now = ngx_time(); | |
950 | |
951 for ( ;; ) { | |
952 if (ngx_queue_empty(queue)) { | |
953 return 0; | |
954 } | |
955 | |
956 q = ngx_queue_last(queue); | |
957 | |
958 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
959 | |
960 if (now < rn->expire) { | |
961 return rn->expire - now; | |
962 } | |
963 | |
1774 | 964 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, |
965 "resolver resend \"%*s\" %p", | |
966 (size_t) rn->nlen, rn->name, rn->waiting); | |
1649 | 967 |
968 ngx_queue_remove(q); | |
969 | |
970 if (rn->waiting) { | |
971 | |
972 if (ngx_resolver_send_query(r, rn) == NGX_OK) { | |
973 | |
974 rn->expire = now + r->resend_timeout; | |
975 | |
976 ngx_queue_insert_head(queue, &rn->queue); | |
977 } | |
1879
cf4ee321d195
do not delete failed DNS request if there are waiting clients
Igor Sysoev <igor@sysoev.ru>
parents:
1878
diff
changeset
|
978 |
cf4ee321d195
do not delete failed DNS request if there are waiting clients
Igor Sysoev <igor@sysoev.ru>
parents:
1878
diff
changeset
|
979 continue; |
1649 | 980 } |
981 | |
982 ngx_rbtree_delete(tree, &rn->node); | |
983 | |
984 ngx_resolver_free_node(r, rn); | |
985 } | |
986 } | |
987 | |
988 | |
989 static void | |
990 ngx_resolver_read_response(ngx_event_t *rev) | |
991 { | |
992 ssize_t n; | |
993 ngx_connection_t *c; | |
994 u_char buf[NGX_RESOLVER_UDP_SIZE]; | |
995 | |
996 c = rev->data; | |
997 | |
998 do { | |
1689 | 999 n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE); |
1000 | |
1001 if (n < 0) { | |
1649 | 1002 return; |
1003 } | |
1004 | |
1005 ngx_resolver_process_response(c->data, buf, n); | |
1006 | |
1007 } while (rev->ready); | |
1008 } | |
1009 | |
1010 | |
1011 static void | |
1012 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n) | |
1013 { | |
1014 char *err; | |
1015 size_t len; | |
2282
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1016 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
|
1017 qtype, qclass; |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1018 ngx_queue_t *q; |
1649 | 1019 ngx_resolver_qs_t *qs; |
2282
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1020 ngx_resolver_node_t *rn; |
1649 | 1021 ngx_resolver_query_t *query; |
1022 | |
2281
5004229420a6
FORMERR DNS response may be equal to mininal query size
Igor Sysoev <igor@sysoev.ru>
parents:
2006
diff
changeset
|
1023 if ((size_t) n < sizeof(ngx_resolver_query_t)) { |
1649 | 1024 goto short_response; |
1025 } | |
1026 | |
1027 query = (ngx_resolver_query_t *) buf; | |
1028 | |
1029 ident = (query->ident_hi << 8) + query->ident_lo; | |
1030 flags = (query->flags_hi << 8) + query->flags_lo; | |
1031 nqs = (query->nqs_hi << 8) + query->nqs_lo; | |
1032 nan = (query->nan_hi << 8) + query->nan_lo; | |
1033 | |
1034 ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1035 "resolver DNS response %ui fl:%04Xui %ui/%ui/%ui/%ui", |
1649 | 1036 ident, flags, nqs, nan, |
1037 (query->nns_hi << 8) + query->nns_lo, | |
1038 (query->nar_hi << 8) + query->nar_lo); | |
1039 | |
1040 if (!(flags & 0x8000)) { | |
1041 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
|
1042 "invalid DNS response %ui fl:%04Xui", ident, flags); |
1649 | 1043 return; |
1044 } | |
1045 | |
1046 code = flags & 0x7f; | |
1047 | |
2282
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1048 if (code == NGX_RESOLVE_FORMERR) { |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1049 |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1050 times = 0; |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1051 |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1052 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
|
1053 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
|
1054 q = ngx_queue_next(q)) |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1055 { |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1056 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
|
1057 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
|
1058 |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1059 if (qident == ident) { |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1060 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
|
1061 "DNS error (%ui: %s), query id:%ui, name:\"%*s\"", |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1062 code, ngx_resolver_strerror(code), ident, |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1063 rn->nlen, rn->name); |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1064 return; |
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 } |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1067 |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1068 goto dns_error; |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1069 } |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1070 |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1071 if (code > NGX_RESOLVE_REFUSED) { |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1072 goto dns_error; |
1649 | 1073 } |
1074 | |
1075 if (nqs != 1) { | |
1076 err = "invalid number of questions in DNS response"; | |
1077 goto done; | |
1078 } | |
1079 | |
1080 i = sizeof(ngx_resolver_query_t); | |
1081 | |
1082 while (i < (ngx_uint_t) n) { | |
1083 if (buf[i] == '\0') { | |
1084 goto found; | |
1085 } | |
1086 | |
1087 len = buf[i]; | |
1088 i += 1 + len; | |
1089 } | |
1090 | |
1091 goto short_response; | |
1092 | |
1093 found: | |
1094 | |
1095 if (i++ == 0) { | |
1096 err = "zero-length domain name in DNS response"; | |
1097 goto done; | |
1098 } | |
1099 | |
1100 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t)) | |
1101 > (ngx_uint_t) n) | |
1102 { | |
1103 goto short_response; | |
1104 } | |
1105 | |
1106 qs = (ngx_resolver_qs_t *) &buf[i]; | |
1107 | |
1108 qtype = (qs->type_hi << 8) + qs->type_lo; | |
1109 qclass = (qs->class_hi << 8) + qs->class_lo; | |
1110 | |
1111 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1967
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diff
changeset
|
1112 "resolver DNS response qt:%ui cl:%ui", qtype, qclass); |
1649 | 1113 |
1114 if (qclass != 1) { | |
1115 ngx_log_error(r->log_level, r->log, 0, | |
1967
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use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1116 "unknown query class %ui in DNS response", qclass); |
1649 | 1117 return; |
1118 } | |
1119 | |
1120 switch (qtype) { | |
1121 | |
1122 case NGX_RESOLVE_A: | |
1123 | |
1124 ngx_resolver_process_a(r, buf, n, ident, code, nan, | |
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
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parents:
1741
diff
changeset
|
1125 i + sizeof(ngx_resolver_qs_t)); |
1649 | 1126 |
1127 break; | |
1128 | |
1129 case NGX_RESOLVE_PTR: | |
1130 | |
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
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parents:
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diff
changeset
|
1131 ngx_resolver_process_ptr(r, buf, n, ident, code, nan); |
1649 | 1132 |
1133 break; | |
1134 | |
1135 default: | |
1136 ngx_log_error(r->log_level, r->log, 0, | |
1967
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use correct ngx_sprintf() formats
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parents:
1966
diff
changeset
|
1137 "unknown query type %ui in DNS response", qtype); |
1649 | 1138 return; |
1139 } | |
1140 | |
1141 return; | |
1142 | |
1143 short_response: | |
1144 | |
1145 err = "short dns response"; | |
1146 | |
1147 done: | |
1148 | |
1149 ngx_log_error(r->log_level, r->log, 0, err); | |
1150 | |
1151 return; | |
2282
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1152 |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1153 dns_error: |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1154 |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1155 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
|
1156 "DNS error (%ui: %s), query id:%ui", |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1157 code, ngx_resolver_strerror(code), ident); |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1158 return; |
1649 | 1159 } |
1160 | |
1161 | |
1162 static void | |
1163 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last, | |
1164 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans) | |
583 | 1165 { |
1649 | 1166 char *err; |
1167 u_char *cname; | |
1168 size_t len; | |
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
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diff
changeset
|
1169 int32_t ttl; |
1649 | 1170 uint32_t hash; |
1171 in_addr_t addr, *addrs; | |
1172 ngx_str_t name; | |
1173 ngx_uint_t qtype, qident, naddrs, a, i, n, start; | |
1174 ngx_resolver_an_t *an; | |
1175 ngx_resolver_ctx_t *ctx, *next; | |
1176 ngx_resolver_node_t *rn; | |
1177 | |
1178 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) { | |
1179 return; | |
1180 } | |
1181 | |
1182 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); | |
1183 | |
1184 hash = ngx_crc32_short(name.data, name.len); | |
1185 | |
1186 /* lock name mutex */ | |
1187 | |
1188 rn = ngx_resolver_lookup_name(r, &name, hash); | |
1189 | |
1190 if (rn == NULL || rn->query == NULL) { | |
1191 ngx_log_error(r->log_level, r->log, 0, | |
1192 "unexpected response for %V", &name); | |
1193 goto failed; | |
1194 } | |
1195 | |
1196 qident = (rn->query[0] << 8) + rn->query[1]; | |
1197 | |
1198 if (ident != qident) { | |
1199 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
|
1200 "wrong ident %ui response for %V, expect %ui", |
1649 | 1201 ident, &name, qident); |
1202 goto failed; | |
1203 } | |
1204 | |
3139 | 1205 ngx_resolver_free(r, name.data); |
1206 | |
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1207 if (code == 0 && nan == 0) { |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1208 code = 3; /* NXDOMAIN */ |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1209 } |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
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diff
changeset
|
1210 |
1649 | 1211 if (code) { |
1212 next = rn->waiting; | |
1213 rn->waiting = NULL; | |
1214 | |
1215 ngx_queue_remove(&rn->queue); | |
1216 | |
1217 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
1218 | |
1219 ngx_resolver_free_node(r, rn); | |
1220 | |
1221 /* unlock name mutex */ | |
1222 | |
1223 while (next) { | |
1224 ctx = next; | |
1225 ctx->state = code; | |
1226 next = ctx->next; | |
1227 | |
1228 ctx->handler(ctx); | |
1229 } | |
1230 | |
1231 return; | |
1232 } | |
1233 | |
1234 i = ans; | |
1235 naddrs = 0; | |
1236 addr = 0; | |
1237 addrs = NULL; | |
1238 cname = NULL; | |
1239 qtype = 0; | |
4296
783fd9c38d98
Silenced a warning for some compilers.
Ruslan Ermilov <ru@nginx.com>
parents:
4295
diff
changeset
|
1240 ttl = 0; |
1649 | 1241 |
1242 for (a = 0; a < nan; a++) { | |
1243 | |
1244 start = i; | |
1245 | |
1246 while (i < last) { | |
1247 | |
1248 if (buf[i] & 0xc0) { | |
1249 i += 2; | |
1250 goto found; | |
1251 } | |
1252 | |
1253 if (buf[i] == 0) { | |
1254 i++; | |
1255 goto test_length; | |
1256 } | |
1257 | |
1258 i += 1 + buf[i]; | |
1259 } | |
1260 | |
1261 goto short_response; | |
1262 | |
1263 test_length: | |
1264 | |
1265 if (i - start < 2) { | |
1266 err = "invalid name in dns response"; | |
1267 goto invalid; | |
1268 } | |
1269 | |
1270 found: | |
1271 | |
1272 if (i + sizeof(ngx_resolver_an_t) >= last) { | |
1273 goto short_response; | |
1274 } | |
1275 | |
1276 an = (ngx_resolver_an_t *) &buf[i]; | |
1277 | |
1278 qtype = (an->type_hi << 8) + an->type_lo; | |
1279 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
|
1280 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
|
1281 + (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
|
1282 |
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1283 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
|
1284 ttl = 0; |
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1285 } |
1649 | 1286 |
1287 if (qtype == NGX_RESOLVE_A) { | |
1288 | |
1289 i += sizeof(ngx_resolver_an_t); | |
1290 | |
1291 if (i + len > last) { | |
1292 goto short_response; | |
1293 } | |
1294 | |
1295 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
1296 + (buf[i + 2] << 8) + (buf[i + 3])); | |
1297 | |
1298 naddrs++; | |
1299 | |
1300 i += len; | |
1301 | |
1302 } else if (qtype == NGX_RESOLVE_CNAME) { | |
1303 cname = &buf[i] + sizeof(ngx_resolver_an_t); | |
1304 i += sizeof(ngx_resolver_an_t) + len; | |
1965 | 1305 |
1306 } else if (qtype == NGX_RESOLVE_DNAME) { | |
1307 i += sizeof(ngx_resolver_an_t) + len; | |
1966 | 1308 |
1309 } else { | |
1310 ngx_log_error(r->log_level, r->log, 0, | |
1311 "unexpected qtype %ui", qtype); | |
1649 | 1312 } |
1313 } | |
1314 | |
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1315 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
|
1316 "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
|
1317 naddrs, cname, ttl); |
1649 | 1318 |
1319 if (naddrs) { | |
1320 | |
1321 if (naddrs == 1) { | |
1322 rn->u.addr = addr; | |
1323 | |
1324 } else { | |
1325 | |
1326 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t)); | |
1327 if (addrs == NULL) { | |
1328 return; | |
1329 } | |
1330 | |
1331 n = 0; | |
1332 i = ans; | |
1333 | |
1334 for (a = 0; a < nan; a++) { | |
1335 | |
1336 for ( ;; ) { | |
1337 | |
1338 if (buf[i] & 0xc0) { | |
1339 i += 2; | |
1340 goto ok; | |
1341 } | |
1342 | |
1343 if (buf[i] == 0) { | |
1344 i++; | |
1345 goto ok; | |
1346 } | |
1347 | |
1348 i += 1 + buf[i]; | |
1349 } | |
1350 | |
1351 ok: | |
1352 | |
1353 an = (ngx_resolver_an_t *) &buf[i]; | |
1354 | |
1355 qtype = (an->type_hi << 8) + an->type_lo; | |
1356 len = (an->len_hi << 8) + an->len_lo; | |
1357 | |
1358 i += sizeof(ngx_resolver_an_t); | |
1359 | |
1360 if (qtype == NGX_RESOLVE_A) { | |
1361 | |
1362 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
1363 + (buf[i + 2] << 8) + (buf[i + 3])); | |
1364 | |
1365 if (n == naddrs) { | |
1366 break; | |
1367 } | |
1368 } | |
1369 | |
1370 i += len; | |
1371 } | |
1372 | |
1373 rn->u.addrs = addrs; | |
1374 | |
1375 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
1376 naddrs * sizeof(in_addr_t)); | |
1377 if (addrs == NULL) { | |
1378 return; | |
1379 } | |
1380 } | |
1381 | |
1382 rn->naddrs = (u_short) naddrs; | |
1383 | |
1384 ngx_queue_remove(&rn->queue); | |
1385 | |
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1386 rn->valid = ngx_time() + (r->valid ? r->valid : ttl); |
1649 | 1387 rn->expire = ngx_time() + r->expire; |
1388 | |
1389 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
1390 | |
1391 next = rn->waiting; | |
1392 rn->waiting = NULL; | |
1393 | |
1394 /* unlock name mutex */ | |
1395 | |
1396 while (next) { | |
1397 ctx = next; | |
1398 ctx->state = NGX_OK; | |
1399 ctx->naddrs = naddrs; | |
1400 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
1401 ctx->addr = addr; | |
1402 next = ctx->next; | |
1403 | |
1404 ctx->handler(ctx); | |
1405 } | |
1406 | |
2483
29494780d978
free addrs only it has been allocated before: non single address
Igor Sysoev <igor@sysoev.ru>
parents:
2482
diff
changeset
|
1407 if (naddrs > 1) { |
1649 | 1408 ngx_resolver_free(r, addrs); |
1409 } | |
1410 | |
1411 return; | |
1412 | |
1413 } else if (cname) { | |
1414 | |
1415 /* CNAME only */ | |
1416 | |
1417 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) { | |
1418 return; | |
1419 } | |
1420 | |
1421 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1422 "resolver cname:\"%V\"", &name); | |
1423 | |
1741
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1424 ngx_queue_remove(&rn->queue); |
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1425 |
1649 | 1426 rn->cnlen = (u_short) name.len; |
1427 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
|
1428 |
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1429 rn->valid = ngx_time() + (r->valid ? r->valid : ttl); |
1649 | 1430 rn->expire = ngx_time() + r->expire; |
1431 | |
1432 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
1433 | |
1434 ctx = rn->waiting; | |
1435 rn->waiting = NULL; | |
1436 | |
1437 if (ctx) { | |
1438 ctx->name = name; | |
1439 | |
1440 (void) ngx_resolve_name_locked(r, ctx); | |
1441 } | |
1442 | |
1443 return; | |
1444 } | |
1445 | |
1446 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
|
1447 "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
|
1448 qtype); |
1649 | 1449 return; |
1450 | |
1451 short_response: | |
1452 | |
1453 err = "short dns response"; | |
1454 | |
1455 invalid: | |
1456 | |
1457 /* unlock name mutex */ | |
1458 | |
1459 ngx_log_error(r->log_level, r->log, 0, err); | |
1460 | |
1461 return; | |
1462 | |
1463 failed: | |
1464 | |
1465 /* unlock name mutex */ | |
1466 | |
3139 | 1467 ngx_resolver_free(r, name.data); |
1468 | |
1649 | 1469 return; |
1470 } | |
1471 | |
1472 | |
1473 static void | |
1474 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
|
1475 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan) |
1649 | 1476 { |
1477 char *err; | |
1478 size_t len; | |
1479 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
|
1480 int32_t ttl; |
1649 | 1481 ngx_int_t digit; |
1482 ngx_str_t name; | |
3902
159b58f9c0bd
fix building by gcc 4.6 without --with-debug
Igor Sysoev <igor@sysoev.ru>
parents:
3763
diff
changeset
|
1483 ngx_uint_t i, mask, qident; |
1649 | 1484 ngx_resolver_an_t *an; |
1485 ngx_resolver_ctx_t *ctx, *next; | |
1486 ngx_resolver_node_t *rn; | |
1487 | |
1488 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) { | |
1489 goto invalid_in_addr_arpa; | |
1490 } | |
1491 | |
1492 addr = 0; | |
1493 i = 12; | |
1494 | |
1495 for (mask = 0; mask < 32; mask += 8) { | |
1496 len = buf[i++]; | |
1497 | |
1498 digit = ngx_atoi(&buf[i], len); | |
1499 if (digit == NGX_ERROR || digit > 255) { | |
1500 goto invalid_in_addr_arpa; | |
1501 } | |
1502 | |
1503 addr += digit << mask; | |
1504 i += len; | |
1505 } | |
1506 | |
1507 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) { | |
1508 goto invalid_in_addr_arpa; | |
1509 } | |
1510 | |
1511 /* lock addr mutex */ | |
1512 | |
1513 rn = ngx_resolver_lookup_addr(r, addr); | |
1514 | |
1515 if (rn == NULL || rn->query == NULL) { | |
1516 ngx_log_error(r->log_level, r->log, 0, | |
1517 "unexpected response for %ud.%ud.%ud.%ud", | |
1518 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
1519 (addr >> 8) & 0xff, addr & 0xff); | |
1520 goto failed; | |
1521 } | |
1522 | |
1523 qident = (rn->query[0] << 8) + rn->query[1]; | |
1524 | |
1525 if (ident != qident) { | |
1526 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
|
1527 "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
|
1528 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff, |
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1529 (addr >> 8) & 0xff, addr & 0xff, qident); |
1649 | 1530 goto failed; |
1531 } | |
1532 | |
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1533 if (code == 0 && nan == 0) { |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1534 code = 3; /* NXDOMAIN */ |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1535 } |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1536 |
1649 | 1537 if (code) { |
1538 next = rn->waiting; | |
1539 rn->waiting = NULL; | |
1540 | |
1541 ngx_queue_remove(&rn->queue); | |
1542 | |
1543 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
1544 | |
1545 ngx_resolver_free_node(r, rn); | |
1546 | |
1547 /* unlock addr mutex */ | |
1548 | |
1549 while (next) { | |
1550 ctx = next; | |
1551 ctx->state = code; | |
1552 next = ctx->next; | |
1553 | |
1554 ctx->handler(ctx); | |
1555 } | |
1556 | |
1557 return; | |
1558 } | |
1559 | |
1560 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t); | |
1561 | |
1562 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) { | |
1563 goto short_response; | |
1564 } | |
1565 | |
1566 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */ | |
1567 | |
1568 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) { | |
1569 err = "invalid in-addr.arpa name in DNS response"; | |
1570 goto invalid; | |
1571 } | |
1572 | |
1573 an = (ngx_resolver_an_t *) &buf[i + 2]; | |
1574 | |
1575 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
|
1576 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
|
1577 + (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
|
1578 |
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1579 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
|
1580 ttl = 0; |
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1581 } |
1649 | 1582 |
1583 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
|
1584 "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
|
1585 (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
|
1586 (an->class_hi << 8) + an->class_lo, len); |
1649 | 1587 |
1588 i += 2 + sizeof(ngx_resolver_an_t); | |
1589 | |
1590 if (i + len > (ngx_uint_t) n) { | |
1591 goto short_response; | |
1592 } | |
1593 | |
1594 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) { | |
1595 return; | |
1596 } | |
1597 | |
1598 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name); | |
1599 | |
2486
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1600 if (name.len != (size_t) rn->nlen |
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1601 || ngx_strncmp(name.data, rn->name, name.len) != 0) |
1649 | 1602 { |
2482
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1603 if (rn->nlen) { |
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1604 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
|
1605 } |
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1606 |
2490
1c87647b7ca5
fix building by msvc, introduced in r2487
Igor Sysoev <igor@sysoev.ru>
parents:
2487
diff
changeset
|
1607 rn->nlen = (u_short) name.len; |
1649 | 1608 rn->name = name.data; |
1609 | |
2486
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1610 name.data = ngx_resolver_dup(r, rn->name, name.len); |
1649 | 1611 if (name.data == NULL) { |
1612 goto failed; | |
1613 } | |
1614 } | |
1615 | |
1616 ngx_queue_remove(&rn->queue); | |
1617 | |
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1618 rn->valid = ngx_time() + (r->valid ? r->valid : ttl); |
1649 | 1619 rn->expire = ngx_time() + r->expire; |
1620 | |
1621 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
1622 | |
1623 next = rn->waiting; | |
1624 rn->waiting = NULL; | |
1625 | |
1626 /* unlock addr mutex */ | |
1627 | |
1628 while (next) { | |
1629 ctx = next; | |
1630 ctx->state = NGX_OK; | |
1631 ctx->name = name; | |
1632 next = ctx->next; | |
1633 | |
1634 ctx->handler(ctx); | |
1635 } | |
1636 | |
1637 ngx_resolver_free(r, name.data); | |
1638 | |
1639 return; | |
1640 | |
1641 invalid_in_addr_arpa: | |
1642 | |
1643 ngx_log_error(r->log_level, r->log, 0, | |
1644 "invalid in-addr.arpa name in DNS response"); | |
1645 return; | |
1646 | |
1647 short_response: | |
1648 | |
1649 err = "short DNS response"; | |
1650 | |
1651 invalid: | |
1652 | |
1653 /* unlock addr mutex */ | |
1654 | |
1655 ngx_log_error(r->log_level, r->log, 0, err); | |
1656 | |
1657 return; | |
1658 | |
1659 failed: | |
1660 | |
1661 /* unlock addr mutex */ | |
1662 | |
1663 return; | |
1664 } | |
1665 | |
1666 | |
1667 static ngx_resolver_node_t * | |
1668 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) | |
1669 { | |
1670 ngx_int_t rc; | |
1671 ngx_rbtree_node_t *node, *sentinel; | |
1672 ngx_resolver_node_t *rn; | |
1673 | |
1674 node = r->name_rbtree.root; | |
1675 sentinel = r->name_rbtree.sentinel; | |
1676 | |
1677 while (node != sentinel) { | |
1678 | |
1679 if (hash < node->key) { | |
1680 node = node->left; | |
1681 continue; | |
1682 } | |
1683 | |
1684 if (hash > node->key) { | |
1685 node = node->right; | |
1686 continue; | |
1687 } | |
1688 | |
1689 /* hash == node->key */ | |
1690 | |
1691 do { | |
1692 rn = (ngx_resolver_node_t *) node; | |
1693 | |
3143
ab6258e18099
fix resolver cache rbtree comparison
Igor Sysoev <igor@sysoev.ru>
parents:
3139
diff
changeset
|
1694 rc = ngx_memn2cmp(name->data, rn->name, name->len, rn->nlen); |
1649 | 1695 |
1696 if (rc == 0) { | |
1697 return rn; | |
1698 } | |
1699 | |
1700 node = (rc < 0) ? node->left : node->right; | |
1701 | |
1702 } while (node != sentinel && hash == node->key); | |
1703 | |
1704 break; | |
1705 } | |
1706 | |
1707 /* not found */ | |
1708 | |
1709 return NULL; | |
1710 } | |
1711 | |
1712 | |
1713 static ngx_resolver_node_t * | |
1714 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr) | |
1715 { | |
1716 ngx_rbtree_node_t *node, *sentinel; | |
1717 | |
1718 node = r->addr_rbtree.root; | |
1719 sentinel = r->addr_rbtree.sentinel; | |
1720 | |
1721 while (node != sentinel) { | |
1722 | |
1723 if (addr < node->key) { | |
1724 node = node->left; | |
1725 continue; | |
1726 } | |
1727 | |
1728 if (addr > node->key) { | |
1729 node = node->right; | |
1730 continue; | |
1731 } | |
1732 | |
1733 /* addr == node->key */ | |
1734 | |
1735 return (ngx_resolver_node_t *) node; | |
1736 } | |
1737 | |
1738 /* not found */ | |
1739 | |
1740 return NULL; | |
1741 } | |
1742 | |
1743 | |
1744 static void | |
1745 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
1746 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
1747 { | |
1748 ngx_rbtree_node_t **p; | |
1749 ngx_resolver_node_t *rn, *rn_temp; | |
1750 | |
1751 for ( ;; ) { | |
1752 | |
1753 if (node->key < temp->key) { | |
1754 | |
1755 p = &temp->left; | |
1756 | |
1757 } else if (node->key > temp->key) { | |
1758 | |
1759 p = &temp->right; | |
1760 | |
1761 } else { /* node->key == temp->key */ | |
1762 | |
1763 rn = (ngx_resolver_node_t *) node; | |
1764 rn_temp = (ngx_resolver_node_t *) temp; | |
1765 | |
3143
ab6258e18099
fix resolver cache rbtree comparison
Igor Sysoev <igor@sysoev.ru>
parents:
3139
diff
changeset
|
1766 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
|
1767 < 0) ? &temp->left : &temp->right; |
1649 | 1768 } |
1769 | |
1770 if (*p == sentinel) { | |
1771 break; | |
1772 } | |
1773 | |
1774 temp = *p; | |
1775 } | |
1776 | |
1777 *p = node; | |
1778 node->parent = temp; | |
1779 node->left = sentinel; | |
1780 node->right = sentinel; | |
1781 ngx_rbt_red(node); | |
1782 } | |
1783 | |
1784 | |
1785 static ngx_int_t | |
1786 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
1787 { | |
1788 u_char *p, *s; | |
3306
61bdaac6c668
fix resolving an empty name (".")
Igor Sysoev <igor@sysoev.ru>
parents:
3299
diff
changeset
|
1789 size_t len, nlen; |
1649 | 1790 ngx_uint_t ident; |
1791 ngx_resolver_qs_t *qs; | |
1792 ngx_resolver_query_t *query; | |
1793 | |
3306
61bdaac6c668
fix resolving an empty name (".")
Igor Sysoev <igor@sysoev.ru>
parents:
3299
diff
changeset
|
1794 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
|
1795 |
61bdaac6c668
fix resolving an empty name (".")
Igor Sysoev <igor@sysoev.ru>
parents:
3299
diff
changeset
|
1796 len = sizeof(ngx_resolver_query_t) + nlen + sizeof(ngx_resolver_qs_t); |
1649 | 1797 |
3307
34e99a97fbd6
use ngx_resolver_alloc() instead of ngx_resolver_calloc()
Igor Sysoev <igor@sysoev.ru>
parents:
3306
diff
changeset
|
1798 p = ngx_resolver_alloc(ctx->resolver, len); |
1649 | 1799 if (p == NULL) { |
1800 return NGX_ERROR; | |
1801 } | |
1802 | |
1803 rn->qlen = (u_short) len; | |
1804 rn->query = p; | |
1805 | |
1806 query = (ngx_resolver_query_t *) p; | |
1807 | |
1808 ident = ngx_random(); | |
1809 | |
1810 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0, | |
1811 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff); | |
1812 | |
1813 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
1814 query->ident_lo = (u_char) (ident & 0xff); | |
1815 | |
1816 /* recursion query */ | |
1817 query->flags_hi = 1; query->flags_lo = 0; | |
1818 | |
1819 /* one question */ | |
1820 query->nqs_hi = 0; query->nqs_lo = 1; | |
1821 query->nan_hi = 0; query->nan_lo = 0; | |
1822 query->nns_hi = 0; query->nns_lo = 0; | |
1823 query->nar_hi = 0; query->nar_lo = 0; | |
1824 | |
3306
61bdaac6c668
fix resolving an empty name (".")
Igor Sysoev <igor@sysoev.ru>
parents:
3299
diff
changeset
|
1825 p += sizeof(ngx_resolver_query_t) + nlen; |
1649 | 1826 |
1827 qs = (ngx_resolver_qs_t *) p; | |
1828 | |
1829 /* query type */ | |
1830 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type; | |
1831 | |
1832 /* IP query class */ | |
1833 qs->class_hi = 0; qs->class_lo = 1; | |
1834 | |
1835 /* convert "www.example.com" to "\3www\7example\3com\0" */ | |
1836 | |
1837 len = 0; | |
1838 p--; | |
1839 *p-- = '\0'; | |
1840 | |
1841 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) { | |
1842 if (*s != '.') { | |
1843 *p = *s; | |
1844 len++; | |
1845 | |
1846 } else { | |
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
1847 if (len == 0) { |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
1848 return NGX_DECLINED; |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
1849 } |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
1850 |
1649 | 1851 *p = (u_char) len; |
1852 len = 0; | |
1853 } | |
1854 | |
1855 p--; | |
1856 } | |
1857 | |
1858 *p = (u_char) len; | |
1859 | |
1860 return NGX_OK; | |
1861 } | |
1862 | |
1863 | |
1864 /* AF_INET only */ | |
1865 | |
1866 static ngx_int_t | |
1867 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
1868 { | |
1869 u_char *p, *d; | |
1870 size_t len; | |
1871 ngx_int_t n; | |
1872 ngx_uint_t ident; | |
1873 ngx_resolver_query_t *query; | |
1874 | |
1875 len = sizeof(ngx_resolver_query_t) | |
1876 + sizeof(".255.255.255.255.in-addr.arpa.") - 1 | |
1877 + sizeof(ngx_resolver_qs_t); | |
1878 | |
3307
34e99a97fbd6
use ngx_resolver_alloc() instead of ngx_resolver_calloc()
Igor Sysoev <igor@sysoev.ru>
parents:
3306
diff
changeset
|
1879 p = ngx_resolver_alloc(ctx->resolver, len); |
1649 | 1880 if (p == NULL) { |
1881 return NGX_ERROR; | |
1882 } | |
1883 | |
1884 rn->query = p; | |
1885 query = (ngx_resolver_query_t *) p; | |
1886 | |
1887 ident = ngx_random(); | |
1888 | |
1889 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
1890 query->ident_lo = (u_char) (ident & 0xff); | |
1891 | |
1892 /* recursion query */ | |
1893 query->flags_hi = 1; query->flags_lo = 0; | |
1894 | |
1895 /* one question */ | |
1896 query->nqs_hi = 0; query->nqs_lo = 1; | |
1897 query->nan_hi = 0; query->nan_lo = 0; | |
1898 query->nns_hi = 0; query->nns_lo = 0; | |
1899 query->nar_hi = 0; query->nar_lo = 0; | |
1900 | |
1901 p += sizeof(ngx_resolver_query_t); | |
1902 | |
3642 | 1903 for (n = 0; n < 32; n += 8) { |
1649 | 1904 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff); |
1905 *p = (u_char) (d - &p[1]); | |
1906 p = d; | |
1907 } | |
1908 | |
1909 /* query type "PTR", IP query class */ | |
1910 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18); | |
1911 | |
1912 rn->qlen = (u_short) | |
1913 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t) | |
1914 - rn->query); | |
1915 | |
1916 return NGX_OK; | |
1917 } | |
1918 | |
1919 | |
1920 static ngx_int_t | |
1921 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src, | |
1922 u_char *last) | |
1923 { | |
1924 char *err; | |
1925 u_char *p, *dst; | |
1926 ssize_t len; | |
1927 ngx_uint_t i, n; | |
1928 | |
1929 p = src; | |
1930 len = -1; | |
1931 | |
1932 /* | |
1933 * compression pointers allow to create endless loop, so we set limit; | |
1934 * 128 pointers should be enough to store 255-byte name | |
1935 */ | |
1936 | |
1937 for (i = 0; i < 128; i++) { | |
1938 n = *p++; | |
1939 | |
1940 if (n == 0) { | |
1941 goto done; | |
1942 } | |
1943 | |
1944 if (n & 0xc0) { | |
2314
52987a023486
fix compression pointer for big (>255) DNS responses
Igor Sysoev <igor@sysoev.ru>
parents:
2282
diff
changeset
|
1945 n = ((n & 0x3f) << 8) + *p; |
1649 | 1946 p = &buf[n]; |
1947 | |
1948 } else { | |
1949 len += 1 + n; | |
1950 p = &p[n]; | |
1951 } | |
1952 | |
1953 if (p >= last) { | |
1954 err = "name is out of response"; | |
1955 goto invalid; | |
1956 } | |
1957 } | |
1958 | |
1959 err = "compression pointers loop"; | |
1960 | |
1961 invalid: | |
1962 | |
1963 ngx_log_error(r->log_level, r->log, 0, err); | |
1964 | |
1965 return NGX_ERROR; | |
1966 | |
1967 done: | |
1968 | |
1969 if (name == NULL) { | |
583 | 1970 return NGX_OK; |
1971 } | |
1972 | |
3298
847ab5a32307
fix "PTR ." case in address resolver
Igor Sysoev <igor@sysoev.ru>
parents:
3297
diff
changeset
|
1973 if (len == -1) { |
847ab5a32307
fix "PTR ." case in address resolver
Igor Sysoev <igor@sysoev.ru>
parents:
3297
diff
changeset
|
1974 name->len = 0; |
847ab5a32307
fix "PTR ." case in address resolver
Igor Sysoev <igor@sysoev.ru>
parents:
3297
diff
changeset
|
1975 name->data = NULL; |
847ab5a32307
fix "PTR ." case in address resolver
Igor Sysoev <igor@sysoev.ru>
parents:
3297
diff
changeset
|
1976 return NGX_OK; |
847ab5a32307
fix "PTR ." case in address resolver
Igor Sysoev <igor@sysoev.ru>
parents:
3297
diff
changeset
|
1977 } |
847ab5a32307
fix "PTR ." case in address resolver
Igor Sysoev <igor@sysoev.ru>
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3297
diff
changeset
|
1978 |
1649 | 1979 dst = ngx_resolver_alloc(r, len); |
1980 if (dst == NULL) { | |
1981 return NGX_ERROR; | |
1982 } | |
1983 | |
1984 name->data = dst; | |
1985 | |
1986 n = *src++; | |
1987 | |
1988 for ( ;; ) { | |
4267
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1989 if (n & 0xc0) { |
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1990 n = ((n & 0x3f) << 8) + *src; |
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1991 src = &buf[n]; |
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1992 |
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1993 n = *src++; |
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1994 |
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1995 } else { |
1649 | 1996 ngx_memcpy(dst, src, n); |
1997 dst += n; | |
1998 src += n; | |
1999 | |
2000 n = *src++; | |
2001 | |
2002 if (n != 0) { | |
2003 *dst++ = '.'; | |
2004 } | |
2005 } | |
2006 | |
2007 if (n == 0) { | |
2008 name->len = dst - name->data; | |
2009 return NGX_OK; | |
2010 } | |
2011 } | |
2012 } | |
2013 | |
2014 | |
2015 static void | |
2016 ngx_resolver_timeout_handler(ngx_event_t *ev) | |
2017 { | |
2018 ngx_resolver_ctx_t *ctx; | |
2019 | |
2020 ctx = ev->data; | |
2021 | |
2022 ctx->state = NGX_RESOLVE_TIMEDOUT; | |
2023 | |
2024 ctx->handler(ctx); | |
2025 } | |
2026 | |
2027 | |
2028 static void | |
2029 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
2030 { | |
2031 /* lock alloc mutex */ | |
2032 | |
2033 if (rn->query) { | |
2034 ngx_resolver_free_locked(r, rn->query); | |
2035 } | |
2036 | |
2037 if (rn->name) { | |
2038 ngx_resolver_free_locked(r, rn->name); | |
2039 } | |
2040 | |
2041 if (rn->cnlen) { | |
2042 ngx_resolver_free_locked(r, rn->u.cname); | |
2043 } | |
2044 | |
2045 if (rn->naddrs > 1) { | |
2046 ngx_resolver_free_locked(r, rn->u.addrs); | |
2047 } | |
2048 | |
2049 ngx_resolver_free_locked(r, rn); | |
2050 | |
2051 /* unlock alloc mutex */ | |
2052 } | |
2053 | |
2054 | |
2055 static void * | |
2056 ngx_resolver_alloc(ngx_resolver_t *r, size_t size) | |
2057 { | |
2058 u_char *p; | |
2059 | |
2060 /* lock alloc mutex */ | |
2061 | |
2062 p = ngx_alloc(size, r->log); | |
2063 | |
2064 /* unlock alloc mutex */ | |
2065 | |
2066 return p; | |
2067 } | |
2068 | |
2069 | |
1903 | 2070 static void * |
1649 | 2071 ngx_resolver_calloc(ngx_resolver_t *r, size_t size) |
2072 { | |
2073 u_char *p; | |
2074 | |
2075 p = ngx_resolver_alloc(r, size); | |
2076 | |
2077 if (p) { | |
2078 ngx_memzero(p, size); | |
2079 } | |
2080 | |
2081 return p; | |
2082 } | |
2083 | |
2084 | |
2085 static void | |
2086 ngx_resolver_free(ngx_resolver_t *r, void *p) | |
2087 { | |
2088 /* lock alloc mutex */ | |
2089 | |
2090 ngx_free(p); | |
2091 | |
2092 /* unlock alloc mutex */ | |
2093 } | |
2094 | |
2095 | |
2096 static void | |
2097 ngx_resolver_free_locked(ngx_resolver_t *r, void *p) | |
2098 { | |
2099 ngx_free(p); | |
2100 } | |
2101 | |
2102 | |
2103 static void * | |
2104 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size) | |
2105 { | |
2106 void *dst; | |
2107 | |
2108 dst = ngx_resolver_alloc(r, size); | |
2109 | |
2110 if (dst == NULL) { | |
2111 return dst; | |
2112 } | |
2113 | |
2114 ngx_memcpy(dst, src, size); | |
2115 | |
2116 return dst; | |
2117 } | |
2118 | |
2119 | |
2120 char * | |
2121 ngx_resolver_strerror(ngx_int_t err) | |
2122 { | |
2123 static char *errors[] = { | |
2124 "Format error", /* FORMERR */ | |
2125 "Server failure", /* SERVFAIL */ | |
2126 "Host not found", /* NXDOMAIN */ | |
2127 "Unimplemented", /* NOTIMP */ | |
2128 "Operation refused" /* REFUSED */ | |
2129 }; | |
2130 | |
2131 if (err > 0 && err < 6) { | |
2132 return errors[err - 1]; | |
2133 } | |
2134 | |
2135 if (err == NGX_RESOLVE_TIMEDOUT) { | |
2136 return "Operation timed out"; | |
2137 } | |
2138 | |
2139 return "Unknown error"; | |
2140 } | |
2141 | |
2142 | |
3408
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2143 static u_char * |
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2144 ngx_resolver_log_error(ngx_log_t *log, u_char *buf, size_t len) |
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2145 { |
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2146 u_char *p; |
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2147 ngx_udp_connection_t *uc; |
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2148 |
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2149 p = buf; |
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2150 |
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2151 if (log->action) { |
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2152 p = ngx_snprintf(buf, len, " while %s", log->action); |
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2153 len -= p - buf; |
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2154 } |
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2155 |
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2156 uc = log->data; |
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2157 |
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2158 if (uc) { |
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2159 p = ngx_snprintf(p, len, ", resolver: %V", &uc->server); |
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2160 } |
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2161 |
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2162 return p; |
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2163 } |
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2164 |
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2165 |
1649 | 2166 ngx_int_t |
2167 ngx_udp_connect(ngx_udp_connection_t *uc) | |
2168 { | |
2169 int rc; | |
2170 ngx_int_t event; | |
2171 ngx_event_t *rev, *wev; | |
2172 ngx_socket_t s; | |
2173 ngx_connection_t *c; | |
2174 | |
583 | 2175 s = ngx_socket(AF_INET, SOCK_DGRAM, 0); |
2176 | |
3408
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2177 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, &uc->log, 0, "UDP socket %d", s); |
583 | 2178 |
2179 if (s == -1) { | |
3408
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2180 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
583 | 2181 ngx_socket_n " failed"); |
2182 return NGX_ERROR; | |
2183 } | |
2184 | |
3408
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2185 c = ngx_get_connection(s, &uc->log); |
583 | 2186 |
2187 if (c == NULL) { | |
2188 if (ngx_close_socket(s) == -1) { | |
3408
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2189 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
583 | 2190 ngx_close_socket_n "failed"); |
2191 } | |
2192 | |
2193 return NGX_ERROR; | |
2194 } | |
2195 | |
1649 | 2196 if (ngx_nonblocking(s) == -1) { |
3408
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2197 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
1649 | 2198 ngx_nonblocking_n " failed"); |
2199 | |
2200 ngx_free_connection(c); | |
2201 | |
2202 if (ngx_close_socket(s) == -1) { | |
3408
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2203 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
1649 | 2204 ngx_close_socket_n " failed"); |
2205 } | |
2206 | |
2207 return NGX_ERROR; | |
2208 } | |
2209 | |
583 | 2210 rev = c->read; |
2211 wev = c->write; | |
2212 | |
3408
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2213 rev->log = &uc->log; |
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2214 wev->log = &uc->log; |
1649 | 2215 |
2216 uc->connection = c; | |
583 | 2217 |
2218 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); | |
2219 | |
2220 #if (NGX_THREADS) | |
1649 | 2221 |
2222 /* TODO: lock event when call completion handler */ | |
2223 | |
2224 rev->lock = &c->lock; | |
2225 wev->lock = &c->lock; | |
583 | 2226 rev->own_lock = &c->lock; |
2227 wev->own_lock = &c->lock; | |
1649 | 2228 |
583 | 2229 #endif |
2230 | |
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2231 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, &uc->log, 0, |
1649 | 2232 "connect to %V, fd:%d #%d", &uc->server, s, c->number); |
2233 | |
2234 rc = connect(s, uc->sockaddr, uc->socklen); | |
2235 | |
2236 /* TODO: aio, iocp */ | |
583 | 2237 |
2238 if (rc == -1) { | |
3408
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2239 ngx_log_error(NGX_LOG_CRIT, &uc->log, ngx_socket_errno, |
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2240 "connect() failed"); |
583 | 2241 |
2242 return NGX_ERROR; | |
2243 } | |
2244 | |
1649 | 2245 /* UDP sockets are always ready to write */ |
2246 wev->ready = 1; | |
2247 | |
2248 if (ngx_add_event) { | |
2249 | |
2250 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ? | |
2251 /* kqueue, epoll */ NGX_CLEAR_EVENT: | |
2252 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT; | |
2253 /* eventport event type has no meaning: oneshot only */ | |
2254 | |
2255 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { | |
2256 return NGX_ERROR; | |
2257 } | |
2258 | |
2259 } else { | |
2260 /* rtsig */ | |
2261 | |
583 | 2262 if (ngx_add_conn(c) == NGX_ERROR) { |
2263 return NGX_ERROR; | |
2264 } | |
2265 } | |
2266 | |
2267 return NGX_OK; | |
2268 } |