Mercurial > hg > nginx
annotate src/core/ngx_resolver.c @ 4295:05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Previously it used a hardcoded value of 300 seconds. Also added the
"valid=" parameter to the "resolver" directive that can be used to
override the cache validity time.
Patch by Kirill A. Korinskiy with minor changes.
| author | Ruslan Ermilov <ru@nginx.com> |
|---|---|
| date | Wed, 16 Nov 2011 13:11:39 +0000 |
| parents | 768212ca0745 |
| children | 783fd9c38d98 |
| rev | line source |
|---|---|
| 583 | 1 |
| 2 /* | |
| 3 * Copyright (C) Igor Sysoev | |
| 4 */ | |
| 5 | |
| 6 | |
| 7 #include <ngx_config.h> | |
| 8 #include <ngx_core.h> | |
| 9 #include <ngx_event.h> | |
| 10 | |
| 11 | |
| 1649 | 12 #define NGX_RESOLVER_UDP_SIZE 4096 |
| 13 | |
| 14 | |
| 583 | 15 typedef struct { |
| 1649 | 16 u_char ident_hi; |
| 17 u_char ident_lo; | |
| 18 u_char flags_hi; | |
| 19 u_char flags_lo; | |
| 20 u_char nqs_hi; | |
| 21 u_char nqs_lo; | |
| 22 u_char nan_hi; | |
| 23 u_char nan_lo; | |
| 24 u_char nns_hi; | |
| 25 u_char nns_lo; | |
| 26 u_char nar_hi; | |
| 27 u_char nar_lo; | |
| 28 } ngx_resolver_query_t; | |
| 29 | |
| 30 | |
| 31 typedef struct { | |
| 32 u_char type_hi; | |
| 33 u_char type_lo; | |
| 34 u_char class_hi; | |
| 35 u_char class_lo; | |
| 36 } ngx_resolver_qs_t; | |
| 37 | |
| 38 | |
| 39 typedef struct { | |
| 40 u_char type_hi; | |
| 41 u_char type_lo; | |
| 42 u_char class_hi; | |
| 43 u_char class_lo; | |
| 44 u_char ttl[4]; | |
| 45 u_char len_hi; | |
| 46 u_char len_lo; | |
| 47 } ngx_resolver_an_t; | |
| 48 | |
| 49 | |
| 50 ngx_int_t ngx_udp_connect(ngx_udp_connection_t *uc); | |
| 51 | |
| 52 | |
| 1906 | 53 static void ngx_resolver_cleanup(void *data); |
| 54 static void ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree); | |
| 1649 | 55 static ngx_int_t ngx_resolve_name_locked(ngx_resolver_t *r, |
| 56 ngx_resolver_ctx_t *ctx); | |
| 57 static void ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
| 58 ngx_queue_t *queue); | |
| 59 static ngx_int_t ngx_resolver_send_query(ngx_resolver_t *r, | |
| 60 ngx_resolver_node_t *rn); | |
| 61 static ngx_int_t ngx_resolver_create_name_query(ngx_resolver_node_t *rn, | |
| 62 ngx_resolver_ctx_t *ctx); | |
| 63 static ngx_int_t ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, | |
| 64 ngx_resolver_ctx_t *ctx); | |
| 65 static void ngx_resolver_resend_handler(ngx_event_t *ev); | |
| 66 static time_t ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
| 67 ngx_queue_t *queue); | |
| 68 static void ngx_resolver_read_response(ngx_event_t *rev); | |
| 69 static void ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, | |
| 70 size_t n); | |
| 71 static void ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t n, | |
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72 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans); |
| 1649 | 73 static void ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, |
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74 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan); |
| 1649 | 75 static ngx_resolver_node_t *ngx_resolver_lookup_name(ngx_resolver_t *r, |
| 76 ngx_str_t *name, uint32_t hash); | |
| 77 static ngx_resolver_node_t *ngx_resolver_lookup_addr(ngx_resolver_t *r, | |
| 78 in_addr_t addr); | |
| 79 static void ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
| 80 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel); | |
| 81 static ngx_int_t ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, | |
| 82 u_char *buf, u_char *src, u_char *last); | |
| 83 static void ngx_resolver_timeout_handler(ngx_event_t *ev); | |
| 84 static void ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn); | |
| 85 static void *ngx_resolver_alloc(ngx_resolver_t *r, size_t size); | |
| 1903 | 86 static void *ngx_resolver_calloc(ngx_resolver_t *r, size_t size); |
| 1649 | 87 static void ngx_resolver_free(ngx_resolver_t *r, void *p); |
| 88 static void ngx_resolver_free_locked(ngx_resolver_t *r, void *p); | |
| 89 static void *ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size); | |
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90 static u_char *ngx_resolver_log_error(ngx_log_t *log, u_char *buf, size_t len); |
| 1649 | 91 |
| 92 | |
| 93 ngx_resolver_t * | |
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94 ngx_resolver_create(ngx_conf_t *cf, ngx_str_t *names, ngx_uint_t n) |
| 1649 | 95 { |
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96 ngx_str_t s; |
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97 ngx_url_t u; |
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98 ngx_uint_t i; |
| 1649 | 99 ngx_resolver_t *r; |
| 1906 | 100 ngx_pool_cleanup_t *cln; |
| 1649 | 101 ngx_udp_connection_t *uc; |
| 102 | |
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103 cln = ngx_pool_cleanup_add(cf->pool, 0); |
| 1906 | 104 if (cln == NULL) { |
| 105 return NULL; | |
| 106 } | |
| 107 | |
| 108 cln->handler = ngx_resolver_cleanup; | |
| 109 | |
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110 r = ngx_calloc(sizeof(ngx_resolver_t), cf->log); |
| 1649 | 111 if (r == NULL) { |
| 112 return NULL; | |
| 113 } | |
| 114 | |
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115 if (n) { |
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116 if (ngx_array_init(&r->udp_connections, cf->pool, n, |
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117 sizeof(ngx_udp_connection_t)) |
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118 != NGX_OK) |
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119 { |
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120 return NULL; |
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121 } |
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122 } |
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123 |
| 1906 | 124 cln->data = r; |
| 125 | |
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126 r->event = ngx_calloc(sizeof(ngx_event_t), cf->log); |
| 1649 | 127 if (r->event == NULL) { |
| 128 return NULL; | |
| 129 } | |
| 130 | |
| 1687 | 131 ngx_rbtree_init(&r->name_rbtree, &r->name_sentinel, |
| 132 ngx_resolver_rbtree_insert_value); | |
| 133 | |
| 134 ngx_rbtree_init(&r->addr_rbtree, &r->addr_sentinel, | |
| 135 ngx_rbtree_insert_value); | |
| 1649 | 136 |
| 1685 | 137 ngx_queue_init(&r->name_resend_queue); |
| 138 ngx_queue_init(&r->addr_resend_queue); | |
| 139 | |
| 140 ngx_queue_init(&r->name_expire_queue); | |
| 141 ngx_queue_init(&r->addr_expire_queue); | |
| 1649 | 142 |
| 143 r->event->handler = ngx_resolver_resend_handler; | |
| 144 r->event->data = r; | |
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145 r->event->log = &cf->cycle->new_log; |
| 1649 | 146 r->ident = -1; |
| 147 | |
| 148 r->resend_timeout = 5; | |
| 149 r->expire = 30; | |
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150 r->valid = 0; |
| 1649 | 151 |
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152 r->log = &cf->cycle->new_log; |
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153 r->log_level = NGX_LOG_ERR; |
| 1649 | 154 |
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155 for (i = 0; i < n; i++) { |
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156 if (ngx_strncmp(names[i].data, "valid=", 6) == 0) { |
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157 s.len = names[i].len - 6; |
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158 s.data = names[i].data + 6; |
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159 |
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160 r->valid = ngx_parse_time(&s, 1); |
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161 |
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162 if (r->valid == NGX_ERROR) { |
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163 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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164 "invalid parameter: %V", &names[i]); |
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165 return NULL; |
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166 } |
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167 |
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168 continue; |
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169 } |
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170 |
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171 ngx_memzero(&u, sizeof(ngx_url_t)); |
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172 |
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173 u.host = names[i]; |
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174 u.port = 53; |
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175 |
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176 if (ngx_inet_resolve_host(cf->pool, &u) != NGX_OK) { |
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177 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%V: %s", &u.host, u.err); |
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178 return NULL; |
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179 } |
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180 |
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181 uc = ngx_array_push(&r->udp_connections); |
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182 if (uc == NULL) { |
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183 return NULL; |
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184 } |
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185 |
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186 ngx_memzero(uc, sizeof(ngx_udp_connection_t)); |
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187 |
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188 uc->sockaddr = u.addrs->sockaddr; |
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189 uc->socklen = u.addrs->socklen; |
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190 uc->server = u.addrs->name; |
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191 |
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192 uc->log = cf->cycle->new_log; |
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193 uc->log.handler = ngx_resolver_log_error; |
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194 uc->log.data = uc; |
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195 uc->log.action = "resolving"; |
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196 } |
| 1649 | 197 |
| 198 return r; | |
| 199 } | |
| 200 | |
| 201 | |
| 1906 | 202 static void |
| 203 ngx_resolver_cleanup(void *data) | |
| 204 { | |
| 205 ngx_resolver_t *r = data; | |
| 206 | |
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207 ngx_uint_t i; |
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208 ngx_udp_connection_t *uc; |
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209 |
| 1906 | 210 if (r) { |
| 211 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, | |
| 212 "cleanup resolver"); | |
| 213 | |
| 214 ngx_resolver_cleanup_tree(r, &r->name_rbtree); | |
| 215 | |
| 216 ngx_resolver_cleanup_tree(r, &r->addr_rbtree); | |
| 217 | |
| 218 if (r->event) { | |
| 219 ngx_free(r->event); | |
| 220 } | |
| 221 | |
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222 |
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223 uc = r->udp_connections.elts; |
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224 |
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225 for (i = 0; i < r->udp_connections.nelts; i++) { |
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|
226 if (uc[i].connection) { |
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227 ngx_close_connection(uc[i].connection); |
| 1906 | 228 } |
| 229 } | |
| 230 | |
| 231 ngx_free(r); | |
| 232 } | |
| 233 } | |
| 234 | |
| 235 | |
| 236 static void | |
| 237 ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree) | |
| 238 { | |
| 239 ngx_resolver_ctx_t *ctx, *next; | |
| 240 ngx_resolver_node_t *rn; | |
| 241 | |
| 242 while (tree->root != tree->sentinel) { | |
| 243 | |
| 244 rn = (ngx_resolver_node_t *) ngx_rbtree_min(tree->root, tree->sentinel); | |
| 245 | |
| 246 ngx_queue_remove(&rn->queue); | |
| 247 | |
| 248 for (ctx = rn->waiting; ctx; ctx = next) { | |
|
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249 next = ctx->next; |
| 1906 | 250 |
| 251 if (ctx->event) { | |
| 252 ngx_resolver_free(r, ctx->event); | |
| 253 } | |
| 254 | |
| 255 ngx_resolver_free(r, ctx); | |
| 256 } | |
| 257 | |
| 258 ngx_rbtree_delete(tree, &rn->node); | |
| 259 | |
| 260 ngx_resolver_free_node(r, rn); | |
| 261 } | |
| 262 } | |
| 263 | |
| 264 | |
| 1649 | 265 ngx_resolver_ctx_t * |
| 266 ngx_resolve_start(ngx_resolver_t *r, ngx_resolver_ctx_t *temp) | |
| 267 { | |
| 268 in_addr_t addr; | |
| 269 ngx_resolver_ctx_t *ctx; | |
| 270 | |
| 271 if (temp) { | |
| 272 addr = ngx_inet_addr(temp->name.data, temp->name.len); | |
| 273 | |
| 274 if (addr != INADDR_NONE) { | |
| 275 temp->resolver = r; | |
| 276 temp->state = NGX_OK; | |
| 277 temp->naddrs = 1; | |
| 278 temp->addrs = &temp->addr; | |
| 279 temp->addr = addr; | |
| 280 temp->quick = 1; | |
| 281 | |
| 282 return temp; | |
| 283 } | |
| 284 } | |
| 285 | |
|
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|
286 if (r->udp_connections.nelts == 0) { |
|
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287 return NGX_NO_RESOLVER; |
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288 } |
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289 |
| 1649 | 290 ctx = ngx_resolver_calloc(r, sizeof(ngx_resolver_ctx_t)); |
| 291 | |
| 292 if (ctx) { | |
| 293 ctx->resolver = r; | |
| 294 } | |
| 295 | |
| 296 return ctx; | |
| 297 } | |
| 298 | |
| 299 | |
| 300 ngx_int_t | |
| 301 ngx_resolve_name(ngx_resolver_ctx_t *ctx) | |
| 302 { | |
| 303 ngx_int_t rc; | |
| 304 ngx_resolver_t *r; | |
| 305 | |
| 306 r = ctx->resolver; | |
| 307 | |
| 308 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 309 "resolve: \"%V\"", &ctx->name); | |
| 310 | |
| 311 if (ctx->quick) { | |
| 312 ctx->handler(ctx); | |
| 313 return NGX_OK; | |
| 314 } | |
| 315 | |
| 316 /* lock name mutex */ | |
| 317 | |
| 318 rc = ngx_resolve_name_locked(r, ctx); | |
| 319 | |
| 320 if (rc == NGX_OK) { | |
| 321 return NGX_OK; | |
| 322 } | |
| 323 | |
| 324 /* unlock name mutex */ | |
| 325 | |
| 326 if (rc == NGX_AGAIN) { | |
| 327 return NGX_OK; | |
| 328 } | |
| 329 | |
|
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fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
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330 /* NGX_ERROR */ |
| 1649 | 331 |
| 332 if (ctx->event) { | |
|
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333 ngx_resolver_free(r, ctx->event); |
| 1649 | 334 } |
| 335 | |
|
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336 ngx_resolver_free(r, ctx); |
| 1649 | 337 |
| 338 return NGX_ERROR; | |
| 339 } | |
| 340 | |
| 341 | |
| 342 void | |
| 343 ngx_resolve_name_done(ngx_resolver_ctx_t *ctx) | |
| 344 { | |
| 345 uint32_t hash; | |
| 346 ngx_resolver_t *r; | |
| 347 ngx_resolver_ctx_t *w, **p; | |
| 348 ngx_resolver_node_t *rn; | |
| 349 | |
| 350 r = ctx->resolver; | |
| 351 | |
| 352 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 353 "resolve name done: %i", ctx->state); | |
| 354 | |
| 355 if (ctx->quick) { | |
| 356 return; | |
| 357 } | |
| 358 | |
| 359 if (ctx->event && ctx->event->timer_set) { | |
| 360 ngx_del_timer(ctx->event); | |
| 361 } | |
| 362 | |
| 363 /* lock name mutex */ | |
| 364 | |
| 365 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
| 366 | |
| 367 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
| 368 | |
| 369 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
| 370 | |
| 371 if (rn) { | |
| 372 p = &rn->waiting; | |
| 373 w = rn->waiting; | |
| 374 | |
| 375 while (w) { | |
| 376 if (w == ctx) { | |
| 377 *p = w->next; | |
| 378 | |
| 379 goto done; | |
| 380 } | |
| 381 | |
| 382 p = &w->next; | |
| 383 w = w->next; | |
| 384 } | |
| 385 } | |
| 386 | |
| 387 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
| 388 "could not cancel %V resolving", &ctx->name); | |
| 389 } | |
| 390 | |
| 391 done: | |
| 392 | |
| 393 ngx_resolver_expire(r, &r->name_rbtree, &r->name_expire_queue); | |
| 394 | |
| 395 /* unlock name mutex */ | |
| 396 | |
|
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parents:
1903
diff
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|
397 /* lock alloc mutex */ |
|
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parents:
1903
diff
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|
398 |
|
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399 if (ctx->event) { |
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400 ngx_resolver_free_locked(r, ctx->event); |
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401 } |
|
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|
402 |
|
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|
403 ngx_resolver_free_locked(r, ctx); |
|
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diff
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|
404 |
|
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diff
changeset
|
405 /* unlock alloc mutex */ |
| 1649 | 406 } |
| 407 | |
| 408 | |
| 409 /* NGX_RESOLVE_A only */ | |
| 410 | |
| 411 static ngx_int_t | |
| 412 ngx_resolve_name_locked(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx) | |
| 413 { | |
| 414 uint32_t hash; | |
| 415 in_addr_t addr, *addrs; | |
|
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
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diff
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|
416 ngx_int_t rc; |
| 1649 | 417 ngx_uint_t naddrs; |
| 418 ngx_resolver_ctx_t *next; | |
| 419 ngx_resolver_node_t *rn; | |
| 420 | |
| 421 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
| 422 | |
| 423 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
| 424 | |
| 425 if (rn) { | |
| 426 | |
| 427 if (rn->valid >= ngx_time()) { | |
| 428 | |
| 429 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
| 430 | |
| 431 ngx_queue_remove(&rn->queue); | |
| 432 | |
| 433 rn->expire = ngx_time() + r->expire; | |
| 434 | |
| 435 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 436 | |
| 437 naddrs = rn->naddrs; | |
| 438 | |
| 439 if (naddrs) { | |
| 440 | |
| 441 /* NGX_RESOLVE_A answer */ | |
| 442 | |
| 443 if (naddrs != 1) { | |
| 444 addr = 0; | |
| 445 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
| 446 naddrs * sizeof(in_addr_t)); | |
| 447 if (addrs == NULL) { | |
| 448 return NGX_ERROR; | |
| 449 } | |
| 450 | |
| 451 } else { | |
| 452 addr = rn->u.addr; | |
| 453 addrs = NULL; | |
| 454 } | |
| 455 | |
| 456 ctx->next = rn->waiting; | |
| 457 rn->waiting = NULL; | |
| 458 | |
| 459 /* unlock name mutex */ | |
| 460 | |
| 461 do { | |
| 462 ctx->state = NGX_OK; | |
| 463 ctx->naddrs = naddrs; | |
| 464 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 465 ctx->addr = addr; | |
| 466 next = ctx->next; | |
| 467 | |
| 468 ctx->handler(ctx); | |
| 469 | |
| 470 ctx = next; | |
| 471 } while (ctx); | |
| 472 | |
| 473 if (addrs) { | |
| 474 ngx_resolver_free(r, addrs); | |
| 475 } | |
| 476 | |
| 477 return NGX_OK; | |
| 478 } | |
| 479 | |
| 480 /* NGX_RESOLVE_CNAME */ | |
| 481 | |
| 1969 | 482 if (ctx->recursion++ < NGX_RESOLVER_MAX_RECURSION) { |
| 483 | |
| 484 ctx->name.len = rn->cnlen; | |
| 485 ctx->name.data = rn->u.cname; | |
| 486 | |
| 487 return ngx_resolve_name_locked(r, ctx); | |
| 488 } | |
| 489 | |
| 490 ctx->next = rn->waiting; | |
| 491 rn->waiting = NULL; | |
| 492 | |
| 493 /* unlock name mutex */ | |
| 494 | |
| 495 do { | |
| 496 ctx->state = NGX_RESOLVE_NXDOMAIN; | |
| 497 next = ctx->next; | |
| 498 | |
| 499 ctx->handler(ctx); | |
| 500 | |
| 501 ctx = next; | |
| 502 } while (ctx); | |
| 503 | |
| 504 return NGX_OK; | |
| 1649 | 505 } |
| 506 | |
| 507 if (rn->waiting) { | |
| 508 | |
| 509 ctx->next = rn->waiting; | |
| 510 rn->waiting = ctx; | |
| 3297 | 511 ctx->state = NGX_AGAIN; |
| 1649 | 512 |
| 513 return NGX_AGAIN; | |
| 514 } | |
| 515 | |
| 516 ngx_queue_remove(&rn->queue); | |
| 517 | |
| 518 /* lock alloc mutex */ | |
| 519 | |
| 520 ngx_resolver_free_locked(r, rn->query); | |
|
1960
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fix memory leak on resolver query send failure
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1914
diff
changeset
|
521 rn->query = NULL; |
| 1649 | 522 |
| 523 if (rn->cnlen) { | |
| 524 ngx_resolver_free_locked(r, rn->u.cname); | |
| 525 } | |
| 526 | |
| 527 if (rn->naddrs > 1) { | |
| 528 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 529 } | |
| 530 | |
| 531 /* unlock alloc mutex */ | |
| 532 | |
| 533 } else { | |
| 534 | |
| 535 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
| 536 if (rn == NULL) { | |
| 537 return NGX_ERROR; | |
| 538 } | |
| 539 | |
| 540 rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len); | |
| 541 if (rn->name == NULL) { | |
| 542 ngx_resolver_free(r, rn); | |
| 543 return NGX_ERROR; | |
| 544 } | |
| 545 | |
| 546 rn->node.key = hash; | |
| 547 rn->nlen = (u_short) ctx->name.len; | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
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1914
diff
changeset
|
548 rn->query = NULL; |
| 1649 | 549 |
| 550 ngx_rbtree_insert(&r->name_rbtree, &rn->node); | |
| 551 } | |
| 552 | |
|
1961
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return NXDOMAIN for ".." in host name
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1960
diff
changeset
|
553 rc = ngx_resolver_create_name_query(rn, ctx); |
|
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1960
diff
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|
554 |
|
99b9feacccb4
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1960
diff
changeset
|
555 if (rc == NGX_ERROR) { |
| 1649 | 556 goto failed; |
| 557 } | |
| 558 | |
|
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
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1960
diff
changeset
|
559 if (rc == NGX_DECLINED) { |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
560 ngx_rbtree_delete(&r->name_rbtree, &rn->node); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
561 |
|
99b9feacccb4
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parents:
1960
diff
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|
562 ngx_resolver_free(r, rn->query); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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1960
diff
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|
563 ngx_resolver_free(r, rn->name); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
564 ngx_resolver_free(r, rn); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
565 |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
566 ctx->state = NGX_RESOLVE_NXDOMAIN; |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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1960
diff
changeset
|
567 ctx->handler(ctx); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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1960
diff
changeset
|
568 |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
569 return NGX_OK; |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
570 } |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
571 |
| 1649 | 572 if (ngx_resolver_send_query(r, rn) != NGX_OK) { |
| 573 goto failed; | |
| 574 } | |
| 575 | |
| 576 if (ctx->event == NULL) { | |
| 577 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
| 578 if (ctx->event == NULL) { | |
| 579 goto failed; | |
| 580 } | |
| 581 | |
| 582 ctx->event->handler = ngx_resolver_timeout_handler; | |
| 583 ctx->event->data = ctx; | |
| 584 ctx->event->log = r->log; | |
| 585 ctx->ident = -1; | |
| 586 | |
| 587 ngx_add_timer(ctx->event, ctx->timeout); | |
| 588 } | |
| 589 | |
| 590 if (ngx_queue_empty(&r->name_resend_queue)) { | |
| 591 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
| 592 } | |
| 593 | |
| 594 rn->expire = ngx_time() + r->resend_timeout; | |
| 595 | |
| 596 ngx_queue_insert_head(&r->name_resend_queue, &rn->queue); | |
| 597 | |
| 598 rn->cnlen = 0; | |
| 599 rn->naddrs = 0; | |
| 600 rn->valid = 0; | |
| 601 rn->waiting = ctx; | |
| 602 | |
| 603 ctx->state = NGX_AGAIN; | |
| 604 | |
| 605 return NGX_AGAIN; | |
| 606 | |
| 607 failed: | |
| 608 | |
| 609 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 610 | |
|
1960
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fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
611 if (rn->query) { |
|
1609b3c3d604
fix memory leak on resolver query send failure
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parents:
1914
diff
changeset
|
612 ngx_resolver_free(r, rn->query); |
|
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fix memory leak on resolver query send failure
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1914
diff
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|
613 } |
|
1609b3c3d604
fix memory leak on resolver query send failure
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1914
diff
changeset
|
614 |
| 1649 | 615 ngx_resolver_free(r, rn->name); |
| 616 | |
| 617 ngx_resolver_free(r, rn); | |
| 618 | |
| 619 return NGX_ERROR; | |
| 620 } | |
| 583 | 621 |
| 622 | |
| 623 ngx_int_t | |
| 1649 | 624 ngx_resolve_addr(ngx_resolver_ctx_t *ctx) |
| 625 { | |
|
2484
cf3cd450049c
store name pointer in variable allocated on stack
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diff
changeset
|
626 u_char *name; |
| 1649 | 627 ngx_resolver_t *r; |
| 628 ngx_resolver_node_t *rn; | |
| 629 | |
| 630 r = ctx->resolver; | |
| 631 | |
| 632 ctx->addr = ntohl(ctx->addr); | |
| 633 | |
| 634 /* lock addr mutex */ | |
| 635 | |
| 636 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
| 637 | |
| 638 if (rn) { | |
| 639 | |
| 640 if (rn->valid >= ngx_time()) { | |
| 641 | |
| 642 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
| 643 | |
| 644 ngx_queue_remove(&rn->queue); | |
| 645 | |
| 646 rn->expire = ngx_time() + r->expire; | |
| 647 | |
| 648 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
| 649 | |
|
2484
cf3cd450049c
store name pointer in variable allocated on stack
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2483
diff
changeset
|
650 name = ngx_resolver_dup(r, rn->name, rn->nlen); |
|
cf3cd450049c
store name pointer in variable allocated on stack
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2483
diff
changeset
|
651 if (name == NULL) { |
| 1649 | 652 goto failed; |
| 653 } | |
| 654 | |
|
2484
cf3cd450049c
store name pointer in variable allocated on stack
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2483
diff
changeset
|
655 ctx->name.len = rn->nlen; |
|
cf3cd450049c
store name pointer in variable allocated on stack
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2483
diff
changeset
|
656 ctx->name.data = name; |
|
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
657 |
| 1649 | 658 /* unlock addr mutex */ |
| 659 | |
| 660 ctx->state = NGX_OK; | |
| 661 | |
| 662 ctx->handler(ctx); | |
| 663 | |
|
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
664 ngx_resolver_free(r, name); |
| 1649 | 665 |
| 666 return NGX_OK; | |
| 667 } | |
| 668 | |
| 669 if (rn->waiting) { | |
| 670 | |
| 671 ctx->next = rn->waiting; | |
| 672 rn->waiting = ctx; | |
| 3297 | 673 ctx->state = NGX_AGAIN; |
| 1649 | 674 |
|
2487
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
675 /* unlock addr mutex */ |
|
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
676 |
|
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
677 return NGX_OK; |
| 1649 | 678 } |
| 679 | |
| 680 ngx_queue_remove(&rn->queue); | |
| 681 | |
| 682 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
|
683 rn->query = NULL; |
| 1649 | 684 |
| 685 } else { | |
| 686 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
| 687 if (rn == NULL) { | |
| 688 goto failed; | |
| 689 } | |
| 690 | |
| 691 rn->node.key = ctx->addr; | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
692 rn->query = NULL; |
| 1649 | 693 |
| 694 ngx_rbtree_insert(&r->addr_rbtree, &rn->node); | |
| 695 } | |
| 696 | |
| 697 if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) { | |
| 698 goto failed; | |
| 699 } | |
| 700 | |
| 701 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
| 702 goto failed; | |
| 703 } | |
| 704 | |
| 705 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
| 706 if (ctx->event == NULL) { | |
| 707 goto failed; | |
| 708 } | |
| 709 | |
| 710 ctx->event->handler = ngx_resolver_timeout_handler; | |
| 711 ctx->event->data = ctx; | |
| 712 ctx->event->log = r->log; | |
| 713 ctx->ident = -1; | |
| 714 | |
| 715 ngx_add_timer(ctx->event, ctx->timeout); | |
| 716 | |
| 717 if (ngx_queue_empty(&r->addr_resend_queue)) { | |
| 718 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
| 719 } | |
| 720 | |
| 721 rn->expire = ngx_time() + r->resend_timeout; | |
| 722 | |
| 723 ngx_queue_insert_head(&r->addr_resend_queue, &rn->queue); | |
| 724 | |
| 725 rn->cnlen = 0; | |
| 726 rn->naddrs = 0; | |
| 727 rn->name = NULL; | |
| 728 rn->nlen = 0; | |
| 729 rn->valid = 0; | |
| 730 rn->waiting = ctx; | |
| 731 | |
| 732 /* unlock addr mutex */ | |
| 733 | |
| 734 ctx->state = NGX_AGAIN; | |
| 735 | |
| 736 return NGX_OK; | |
| 737 | |
| 738 failed: | |
| 739 | |
| 740 if (rn) { | |
| 741 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 742 | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
743 if (rn->query) { |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
744 ngx_resolver_free(r, rn->query); |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
745 } |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
746 |
| 1649 | 747 ngx_resolver_free(r, rn); |
| 748 } | |
| 749 | |
| 750 /* unlock addr mutex */ | |
| 751 | |
| 752 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
|
753 ngx_resolver_free(r, ctx->event); |
| 1649 | 754 } |
| 755 | |
|
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); |
| 1649 | 757 |
| 758 return NGX_ERROR; | |
| 759 } | |
| 760 | |
| 761 | |
| 762 void | |
| 763 ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx) | |
| 764 { | |
| 765 in_addr_t addr; | |
| 766 ngx_resolver_t *r; | |
| 767 ngx_resolver_ctx_t *w, **p; | |
| 768 ngx_resolver_node_t *rn; | |
| 769 | |
| 770 r = ctx->resolver; | |
| 771 | |
| 772 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 773 "resolve addr done: %i", ctx->state); | |
| 774 | |
| 775 if (ctx->event && ctx->event->timer_set) { | |
| 776 ngx_del_timer(ctx->event); | |
| 777 } | |
| 778 | |
| 779 /* lock addr mutex */ | |
| 780 | |
| 781 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
| 782 | |
| 783 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
| 784 | |
| 785 if (rn) { | |
| 786 p = &rn->waiting; | |
| 787 w = rn->waiting; | |
| 788 | |
| 789 while (w) { | |
| 790 if (w == ctx) { | |
| 791 *p = w->next; | |
| 792 | |
| 793 goto done; | |
| 794 } | |
| 795 | |
| 796 p = &w->next; | |
| 797 w = w->next; | |
| 798 } | |
| 799 } | |
| 800 | |
| 801 addr = ntohl(ctx->addr); | |
| 802 | |
| 803 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
| 804 "could not cancel %ud.%ud.%ud.%ud resolving", | |
| 805 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 806 (addr >> 8) & 0xff, addr & 0xff); | |
| 807 } | |
| 808 | |
| 809 done: | |
| 810 | |
| 811 ngx_resolver_expire(r, &r->addr_rbtree, &r->addr_expire_queue); | |
| 812 | |
| 813 /* unlock addr mutex */ | |
| 814 | |
|
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
815 /* 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
|
816 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
817 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
|
818 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
|
819 } |
|
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 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
|
822 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
823 /* unlock alloc mutex */ |
| 1649 | 824 } |
| 825 | |
| 826 | |
| 827 static void | |
| 828 ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 829 { | |
| 830 time_t now; | |
| 831 ngx_uint_t i; | |
| 832 ngx_queue_t *q; | |
| 833 ngx_resolver_node_t *rn; | |
| 834 | |
| 835 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire"); | |
| 836 | |
| 837 now = ngx_time(); | |
| 838 | |
| 839 for (i = 0; i < 2; i++) { | |
| 840 if (ngx_queue_empty(queue)) { | |
| 841 return; | |
| 842 } | |
| 843 | |
| 844 q = ngx_queue_last(queue); | |
| 845 | |
| 846 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 847 | |
| 848 if (now <= rn->expire) { | |
| 849 return; | |
| 850 } | |
| 851 | |
| 1774 | 852 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, |
| 853 "resolver expire \"%*s\"", (size_t) rn->nlen, rn->name); | |
| 1649 | 854 |
| 855 ngx_queue_remove(q); | |
| 856 | |
| 857 ngx_rbtree_delete(tree, &rn->node); | |
| 858 | |
| 859 ngx_resolver_free_node(r, rn); | |
| 860 } | |
| 861 } | |
| 862 | |
| 863 | |
| 864 static ngx_int_t | |
| 865 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 866 { | |
| 867 ssize_t n; | |
| 868 ngx_udp_connection_t *uc; | |
| 869 | |
|
4225
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
870 uc = r->udp_connections.elts; |
|
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
871 |
|
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
872 uc = &uc[r->last_connection++]; |
|
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
873 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
|
874 r->last_connection = 0; |
|
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
875 } |
| 1649 | 876 |
| 877 if (uc->connection == NULL) { | |
| 878 if (ngx_udp_connect(uc) != NGX_OK) { | |
| 879 return NGX_ERROR; | |
| 880 } | |
| 881 | |
| 882 uc->connection->data = r; | |
| 883 uc->connection->read->handler = ngx_resolver_read_response; | |
| 1906 | 884 uc->connection->read->resolver = 1; |
| 1649 | 885 } |
| 886 | |
| 887 n = ngx_send(uc->connection, rn->query, rn->qlen); | |
| 888 | |
| 889 if (n == -1) { | |
| 890 return NGX_ERROR; | |
| 891 } | |
| 892 | |
| 893 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
|
894 ngx_log_error(NGX_LOG_CRIT, &uc->log, 0, "send() incomplete"); |
| 1649 | 895 return NGX_ERROR; |
| 896 } | |
| 897 | |
| 898 return NGX_OK; | |
| 899 } | |
| 900 | |
| 901 | |
| 902 static void | |
| 903 ngx_resolver_resend_handler(ngx_event_t *ev) | |
| 904 { | |
| 905 time_t timer, atimer, ntimer; | |
| 906 ngx_resolver_t *r; | |
| 907 | |
| 908 r = ev->data; | |
| 909 | |
| 910 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 911 "resolver resend handler"); | |
| 912 | |
| 913 /* lock name mutex */ | |
| 914 | |
| 915 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue); | |
| 916 | |
| 917 /* unlock name mutex */ | |
| 918 | |
| 919 /* lock addr mutex */ | |
| 920 | |
| 921 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
|
922 |
| 1649 | 923 /* unlock addr mutex */ |
| 924 | |
| 925 if (ntimer == 0) { | |
| 926 timer = atimer; | |
| 927 | |
| 928 } else if (atimer == 0) { | |
| 929 timer = ntimer; | |
| 930 | |
| 931 } else { | |
| 932 timer = (atimer < ntimer) ? atimer : ntimer; | |
| 933 } | |
| 934 | |
| 935 if (timer) { | |
| 936 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000)); | |
| 937 } | |
| 938 } | |
| 939 | |
| 940 | |
| 941 static time_t | |
| 942 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 943 { | |
| 944 time_t now; | |
| 945 ngx_queue_t *q; | |
| 946 ngx_resolver_node_t *rn; | |
| 947 | |
| 948 now = ngx_time(); | |
| 949 | |
| 950 for ( ;; ) { | |
| 951 if (ngx_queue_empty(queue)) { | |
| 952 return 0; | |
| 953 } | |
| 954 | |
| 955 q = ngx_queue_last(queue); | |
| 956 | |
| 957 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 958 | |
| 959 if (now < rn->expire) { | |
| 960 return rn->expire - now; | |
| 961 } | |
| 962 | |
| 1774 | 963 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, |
| 964 "resolver resend \"%*s\" %p", | |
| 965 (size_t) rn->nlen, rn->name, rn->waiting); | |
| 1649 | 966 |
| 967 ngx_queue_remove(q); | |
| 968 | |
| 969 if (rn->waiting) { | |
| 970 | |
| 971 if (ngx_resolver_send_query(r, rn) == NGX_OK) { | |
| 972 | |
| 973 rn->expire = now + r->resend_timeout; | |
| 974 | |
| 975 ngx_queue_insert_head(queue, &rn->queue); | |
| 976 } | |
|
1879
cf4ee321d195
do not delete failed DNS request if there are waiting clients
Igor Sysoev <igor@sysoev.ru>
parents:
1878
diff
changeset
|
977 |
|
cf4ee321d195
do not delete failed DNS request if there are waiting clients
Igor Sysoev <igor@sysoev.ru>
parents:
1878
diff
changeset
|
978 continue; |
| 1649 | 979 } |
| 980 | |
| 981 ngx_rbtree_delete(tree, &rn->node); | |
| 982 | |
| 983 ngx_resolver_free_node(r, rn); | |
| 984 } | |
| 985 } | |
| 986 | |
| 987 | |
| 988 static void | |
| 989 ngx_resolver_read_response(ngx_event_t *rev) | |
| 990 { | |
| 991 ssize_t n; | |
| 992 ngx_connection_t *c; | |
| 993 u_char buf[NGX_RESOLVER_UDP_SIZE]; | |
| 994 | |
| 995 c = rev->data; | |
| 996 | |
| 997 do { | |
| 1689 | 998 n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE); |
| 999 | |
| 1000 if (n < 0) { | |
| 1649 | 1001 return; |
| 1002 } | |
| 1003 | |
| 1004 ngx_resolver_process_response(c->data, buf, n); | |
| 1005 | |
| 1006 } while (rev->ready); | |
| 1007 } | |
| 1008 | |
| 1009 | |
| 1010 static void | |
| 1011 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n) | |
| 1012 { | |
| 1013 char *err; | |
| 1014 size_t len; | |
|
2282
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1015 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
|
1016 qtype, qclass; |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1017 ngx_queue_t *q; |
| 1649 | 1018 ngx_resolver_qs_t *qs; |
|
2282
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1019 ngx_resolver_node_t *rn; |
| 1649 | 1020 ngx_resolver_query_t *query; |
| 1021 | |
|
2281
5004229420a6
FORMERR DNS response may be equal to mininal query size
Igor Sysoev <igor@sysoev.ru>
parents:
2006
diff
changeset
|
1022 if ((size_t) n < sizeof(ngx_resolver_query_t)) { |
| 1649 | 1023 goto short_response; |
| 1024 } | |
| 1025 | |
| 1026 query = (ngx_resolver_query_t *) buf; | |
| 1027 | |
| 1028 ident = (query->ident_hi << 8) + query->ident_lo; | |
| 1029 flags = (query->flags_hi << 8) + query->flags_lo; | |
| 1030 nqs = (query->nqs_hi << 8) + query->nqs_lo; | |
| 1031 nan = (query->nan_hi << 8) + query->nan_lo; | |
| 1032 | |
| 1033 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
|
1034 "resolver DNS response %ui fl:%04Xui %ui/%ui/%ui/%ui", |
| 1649 | 1035 ident, flags, nqs, nan, |
| 1036 (query->nns_hi << 8) + query->nns_lo, | |
| 1037 (query->nar_hi << 8) + query->nar_lo); | |
| 1038 | |
| 1039 if (!(flags & 0x8000)) { | |
| 1040 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
|
1041 "invalid DNS response %ui fl:%04Xui", ident, flags); |
| 1649 | 1042 return; |
| 1043 } | |
| 1044 | |
| 1045 code = flags & 0x7f; | |
| 1046 | |
|
2282
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1047 if (code == NGX_RESOLVE_FORMERR) { |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1048 |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1049 times = 0; |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1050 |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1051 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
|
1052 q != ngx_queue_sentinel(&r->name_resend_queue) || times++ < 100; |
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|
1053 q = ngx_queue_next(q)) |
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|
1054 { |
|
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1055 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); |
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1056 qident = (rn->query[0] << 8) + rn->query[1]; |
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1057 |
|
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1058 if (qident == ident) { |
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1059 ngx_log_error(r->log_level, r->log, 0, |
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1060 "DNS error (%ui: %s), query id:%ui, name:\"%*s\"", |
|
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1061 code, ngx_resolver_strerror(code), ident, |
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1062 rn->nlen, rn->name); |
|
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diff
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|
1063 return; |
|
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1064 } |
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|
1065 } |
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|
1066 |
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|
1067 goto dns_error; |
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|
1068 } |
|
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|
1069 |
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|
1070 if (code > NGX_RESOLVE_REFUSED) { |
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|
1071 goto dns_error; |
| 1649 | 1072 } |
| 1073 | |
| 1074 if (nqs != 1) { | |
| 1075 err = "invalid number of questions in DNS response"; | |
| 1076 goto done; | |
| 1077 } | |
| 1078 | |
| 1079 i = sizeof(ngx_resolver_query_t); | |
| 1080 | |
| 1081 while (i < (ngx_uint_t) n) { | |
| 1082 if (buf[i] == '\0') { | |
| 1083 goto found; | |
| 1084 } | |
| 1085 | |
| 1086 len = buf[i]; | |
| 1087 i += 1 + len; | |
| 1088 } | |
| 1089 | |
| 1090 goto short_response; | |
| 1091 | |
| 1092 found: | |
| 1093 | |
| 1094 if (i++ == 0) { | |
| 1095 err = "zero-length domain name in DNS response"; | |
| 1096 goto done; | |
| 1097 } | |
| 1098 | |
| 1099 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t)) | |
| 1100 > (ngx_uint_t) n) | |
| 1101 { | |
| 1102 goto short_response; | |
| 1103 } | |
| 1104 | |
| 1105 qs = (ngx_resolver_qs_t *) &buf[i]; | |
| 1106 | |
| 1107 qtype = (qs->type_hi << 8) + qs->type_lo; | |
| 1108 qclass = (qs->class_hi << 8) + qs->class_lo; | |
| 1109 | |
| 1110 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
|
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|
1111 "resolver DNS response qt:%ui cl:%ui", qtype, qclass); |
| 1649 | 1112 |
| 1113 if (qclass != 1) { | |
| 1114 ngx_log_error(r->log_level, r->log, 0, | |
|
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|
1115 "unknown query class %ui in DNS response", qclass); |
| 1649 | 1116 return; |
| 1117 } | |
| 1118 | |
| 1119 switch (qtype) { | |
| 1120 | |
| 1121 case NGX_RESOLVE_A: | |
| 1122 | |
| 1123 ngx_resolver_process_a(r, buf, n, ident, code, nan, | |
|
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|
1124 i + sizeof(ngx_resolver_qs_t)); |
| 1649 | 1125 |
| 1126 break; | |
| 1127 | |
| 1128 case NGX_RESOLVE_PTR: | |
| 1129 | |
|
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diff
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|
1130 ngx_resolver_process_ptr(r, buf, n, ident, code, nan); |
| 1649 | 1131 |
| 1132 break; | |
| 1133 | |
| 1134 default: | |
| 1135 ngx_log_error(r->log_level, r->log, 0, | |
|
1967
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|
1136 "unknown query type %ui in DNS response", qtype); |
| 1649 | 1137 return; |
| 1138 } | |
| 1139 | |
| 1140 return; | |
| 1141 | |
| 1142 short_response: | |
| 1143 | |
| 1144 err = "short dns response"; | |
| 1145 | |
| 1146 done: | |
| 1147 | |
| 1148 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1149 | |
| 1150 return; | |
|
2282
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|
1151 |
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|
1152 dns_error: |
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|
1153 |
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|
1154 ngx_log_error(r->log_level, r->log, 0, |
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diff
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|
1155 "DNS error (%ui: %s), query id:%ui", |
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|
1156 code, ngx_resolver_strerror(code), ident); |
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|
1157 return; |
| 1649 | 1158 } |
| 1159 | |
| 1160 | |
| 1161 static void | |
| 1162 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last, | |
| 1163 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans) | |
| 583 | 1164 { |
| 1649 | 1165 char *err; |
| 1166 u_char *cname; | |
| 1167 size_t len; | |
|
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|
1168 int32_t ttl; |
| 1649 | 1169 uint32_t hash; |
| 1170 in_addr_t addr, *addrs; | |
| 1171 ngx_str_t name; | |
| 1172 ngx_uint_t qtype, qident, naddrs, a, i, n, start; | |
| 1173 ngx_resolver_an_t *an; | |
| 1174 ngx_resolver_ctx_t *ctx, *next; | |
| 1175 ngx_resolver_node_t *rn; | |
| 1176 | |
| 1177 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) { | |
| 1178 return; | |
| 1179 } | |
| 1180 | |
| 1181 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); | |
| 1182 | |
| 1183 hash = ngx_crc32_short(name.data, name.len); | |
| 1184 | |
| 1185 /* lock name mutex */ | |
| 1186 | |
| 1187 rn = ngx_resolver_lookup_name(r, &name, hash); | |
| 1188 | |
| 1189 if (rn == NULL || rn->query == NULL) { | |
| 1190 ngx_log_error(r->log_level, r->log, 0, | |
| 1191 "unexpected response for %V", &name); | |
| 1192 goto failed; | |
| 1193 } | |
| 1194 | |
| 1195 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 1196 | |
| 1197 if (ident != qident) { | |
| 1198 ngx_log_error(r->log_level, r->log, 0, | |
|
1967
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diff
changeset
|
1199 "wrong ident %ui response for %V, expect %ui", |
| 1649 | 1200 ident, &name, qident); |
| 1201 goto failed; | |
| 1202 } | |
| 1203 | |
| 3139 | 1204 ngx_resolver_free(r, name.data); |
| 1205 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
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1741
diff
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|
1206 if (code == 0 && nan == 0) { |
|
268b81386fe4
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diff
changeset
|
1207 code = 3; /* NXDOMAIN */ |
|
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no answers in DNS response should be NXDOMAIN
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diff
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|
1208 } |
|
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diff
changeset
|
1209 |
| 1649 | 1210 if (code) { |
| 1211 next = rn->waiting; | |
| 1212 rn->waiting = NULL; | |
| 1213 | |
| 1214 ngx_queue_remove(&rn->queue); | |
| 1215 | |
| 1216 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 1217 | |
| 1218 ngx_resolver_free_node(r, rn); | |
| 1219 | |
| 1220 /* unlock name mutex */ | |
| 1221 | |
| 1222 while (next) { | |
| 1223 ctx = next; | |
| 1224 ctx->state = code; | |
| 1225 next = ctx->next; | |
| 1226 | |
| 1227 ctx->handler(ctx); | |
| 1228 } | |
| 1229 | |
| 1230 return; | |
| 1231 } | |
| 1232 | |
| 1233 i = ans; | |
| 1234 naddrs = 0; | |
| 1235 addr = 0; | |
| 1236 addrs = NULL; | |
| 1237 cname = NULL; | |
| 1238 qtype = 0; | |
| 1239 | |
| 1240 for (a = 0; a < nan; a++) { | |
| 1241 | |
| 1242 start = i; | |
| 1243 | |
| 1244 while (i < last) { | |
| 1245 | |
| 1246 if (buf[i] & 0xc0) { | |
| 1247 i += 2; | |
| 1248 goto found; | |
| 1249 } | |
| 1250 | |
| 1251 if (buf[i] == 0) { | |
| 1252 i++; | |
| 1253 goto test_length; | |
| 1254 } | |
| 1255 | |
| 1256 i += 1 + buf[i]; | |
| 1257 } | |
| 1258 | |
| 1259 goto short_response; | |
| 1260 | |
| 1261 test_length: | |
| 1262 | |
| 1263 if (i - start < 2) { | |
| 1264 err = "invalid name in dns response"; | |
| 1265 goto invalid; | |
| 1266 } | |
| 1267 | |
| 1268 found: | |
| 1269 | |
| 1270 if (i + sizeof(ngx_resolver_an_t) >= last) { | |
| 1271 goto short_response; | |
| 1272 } | |
| 1273 | |
| 1274 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1275 | |
| 1276 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1277 len = (an->len_hi << 8) + an->len_lo; | |
|
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diff
changeset
|
1278 ttl = (an->ttl[0] << 24) + (an->ttl[1] << 16) |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
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diff
changeset
|
1279 + (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>
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diff
changeset
|
1280 |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
1281 if (ttl < 0) { |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
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diff
changeset
|
1282 ttl = 0; |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
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diff
changeset
|
1283 } |
| 1649 | 1284 |
| 1285 if (qtype == NGX_RESOLVE_A) { | |
| 1286 | |
| 1287 i += sizeof(ngx_resolver_an_t); | |
| 1288 | |
| 1289 if (i + len > last) { | |
| 1290 goto short_response; | |
| 1291 } | |
| 1292 | |
| 1293 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1294 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1295 | |
| 1296 naddrs++; | |
| 1297 | |
| 1298 i += len; | |
| 1299 | |
| 1300 } else if (qtype == NGX_RESOLVE_CNAME) { | |
| 1301 cname = &buf[i] + sizeof(ngx_resolver_an_t); | |
| 1302 i += sizeof(ngx_resolver_an_t) + len; | |
| 1965 | 1303 |
| 1304 } else if (qtype == NGX_RESOLVE_DNAME) { | |
| 1305 i += sizeof(ngx_resolver_an_t) + len; | |
| 1966 | 1306 |
| 1307 } else { | |
| 1308 ngx_log_error(r->log_level, r->log, 0, | |
| 1309 "unexpected qtype %ui", qtype); | |
| 1649 | 1310 } |
| 1311 } | |
| 1312 | |
|
4295
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diff
changeset
|
1313 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
|
1314 "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:
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diff
changeset
|
1315 naddrs, cname, ttl); |
| 1649 | 1316 |
| 1317 if (naddrs) { | |
| 1318 | |
| 1319 if (naddrs == 1) { | |
| 1320 rn->u.addr = addr; | |
| 1321 | |
| 1322 } else { | |
| 1323 | |
| 1324 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t)); | |
| 1325 if (addrs == NULL) { | |
| 1326 return; | |
| 1327 } | |
| 1328 | |
| 1329 n = 0; | |
| 1330 i = ans; | |
| 1331 | |
| 1332 for (a = 0; a < nan; a++) { | |
| 1333 | |
| 1334 for ( ;; ) { | |
| 1335 | |
| 1336 if (buf[i] & 0xc0) { | |
| 1337 i += 2; | |
| 1338 goto ok; | |
| 1339 } | |
| 1340 | |
| 1341 if (buf[i] == 0) { | |
| 1342 i++; | |
| 1343 goto ok; | |
| 1344 } | |
| 1345 | |
| 1346 i += 1 + buf[i]; | |
| 1347 } | |
| 1348 | |
| 1349 ok: | |
| 1350 | |
| 1351 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1352 | |
| 1353 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1354 len = (an->len_hi << 8) + an->len_lo; | |
| 1355 | |
| 1356 i += sizeof(ngx_resolver_an_t); | |
| 1357 | |
| 1358 if (qtype == NGX_RESOLVE_A) { | |
| 1359 | |
| 1360 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1361 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1362 | |
| 1363 if (n == naddrs) { | |
| 1364 break; | |
| 1365 } | |
| 1366 } | |
| 1367 | |
| 1368 i += len; | |
| 1369 } | |
| 1370 | |
| 1371 rn->u.addrs = addrs; | |
| 1372 | |
| 1373 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
| 1374 naddrs * sizeof(in_addr_t)); | |
| 1375 if (addrs == NULL) { | |
| 1376 return; | |
| 1377 } | |
| 1378 } | |
| 1379 | |
| 1380 rn->naddrs = (u_short) naddrs; | |
| 1381 | |
| 1382 ngx_queue_remove(&rn->queue); | |
| 1383 | |
|
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diff
changeset
|
1384 rn->valid = ngx_time() + (r->valid ? r->valid : ttl); |
| 1649 | 1385 rn->expire = ngx_time() + r->expire; |
| 1386 | |
| 1387 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1388 | |
| 1389 next = rn->waiting; | |
| 1390 rn->waiting = NULL; | |
| 1391 | |
| 1392 /* unlock name mutex */ | |
| 1393 | |
| 1394 while (next) { | |
| 1395 ctx = next; | |
| 1396 ctx->state = NGX_OK; | |
| 1397 ctx->naddrs = naddrs; | |
| 1398 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 1399 ctx->addr = addr; | |
| 1400 next = ctx->next; | |
| 1401 | |
| 1402 ctx->handler(ctx); | |
| 1403 } | |
| 1404 | |
|
2483
29494780d978
free addrs only it has been allocated before: non single address
Igor Sysoev <igor@sysoev.ru>
parents:
2482
diff
changeset
|
1405 if (naddrs > 1) { |
| 1649 | 1406 ngx_resolver_free(r, addrs); |
| 1407 } | |
| 1408 | |
| 1409 return; | |
| 1410 | |
| 1411 } else if (cname) { | |
| 1412 | |
| 1413 /* CNAME only */ | |
| 1414 | |
| 1415 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) { | |
| 1416 return; | |
| 1417 } | |
| 1418 | |
| 1419 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1420 "resolver cname:\"%V\"", &name); | |
| 1421 | |
|
1741
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1422 ngx_queue_remove(&rn->queue); |
|
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1423 |
| 1649 | 1424 rn->cnlen = (u_short) name.len; |
| 1425 rn->u.cname = name.data; | |
|
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diff
changeset
|
1426 |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
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diff
changeset
|
1427 rn->valid = ngx_time() + (r->valid ? r->valid : ttl); |
| 1649 | 1428 rn->expire = ngx_time() + r->expire; |
| 1429 | |
| 1430 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1431 | |
| 1432 ctx = rn->waiting; | |
| 1433 rn->waiting = NULL; | |
| 1434 | |
| 1435 if (ctx) { | |
| 1436 ctx->name = name; | |
| 1437 | |
| 1438 (void) ngx_resolve_name_locked(r, ctx); | |
| 1439 } | |
| 1440 | |
| 1441 return; | |
| 1442 } | |
| 1443 | |
| 1444 ngx_log_error(r->log_level, r->log, 0, | |
|
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parents:
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diff
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|
1445 "no A or CNAME types in DNS responses, unknown query type: %ui", |
|
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|
1446 qtype); |
| 1649 | 1447 return; |
| 1448 | |
| 1449 short_response: | |
| 1450 | |
| 1451 err = "short dns response"; | |
| 1452 | |
| 1453 invalid: | |
| 1454 | |
| 1455 /* unlock name mutex */ | |
| 1456 | |
| 1457 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1458 | |
| 1459 return; | |
| 1460 | |
| 1461 failed: | |
| 1462 | |
| 1463 /* unlock name mutex */ | |
| 1464 | |
| 3139 | 1465 ngx_resolver_free(r, name.data); |
| 1466 | |
| 1649 | 1467 return; |
| 1468 } | |
| 1469 | |
| 1470 | |
| 1471 static void | |
| 1472 ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, | |
|
1742
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no answers in DNS response should be NXDOMAIN
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parents:
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diff
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|
1473 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan) |
| 1649 | 1474 { |
| 1475 char *err; | |
| 1476 size_t len; | |
| 1477 in_addr_t addr; | |
|
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Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1478 int32_t ttl; |
| 1649 | 1479 ngx_int_t digit; |
| 1480 ngx_str_t name; | |
|
3902
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fix building by gcc 4.6 without --with-debug
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diff
changeset
|
1481 ngx_uint_t i, mask, qident; |
| 1649 | 1482 ngx_resolver_an_t *an; |
| 1483 ngx_resolver_ctx_t *ctx, *next; | |
| 1484 ngx_resolver_node_t *rn; | |
| 1485 | |
| 1486 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) { | |
| 1487 goto invalid_in_addr_arpa; | |
| 1488 } | |
| 1489 | |
| 1490 addr = 0; | |
| 1491 i = 12; | |
| 1492 | |
| 1493 for (mask = 0; mask < 32; mask += 8) { | |
| 1494 len = buf[i++]; | |
| 1495 | |
| 1496 digit = ngx_atoi(&buf[i], len); | |
| 1497 if (digit == NGX_ERROR || digit > 255) { | |
| 1498 goto invalid_in_addr_arpa; | |
| 1499 } | |
| 1500 | |
| 1501 addr += digit << mask; | |
| 1502 i += len; | |
| 1503 } | |
| 1504 | |
| 1505 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) { | |
| 1506 goto invalid_in_addr_arpa; | |
| 1507 } | |
| 1508 | |
| 1509 /* lock addr mutex */ | |
| 1510 | |
| 1511 rn = ngx_resolver_lookup_addr(r, addr); | |
| 1512 | |
| 1513 if (rn == NULL || rn->query == NULL) { | |
| 1514 ngx_log_error(r->log_level, r->log, 0, | |
| 1515 "unexpected response for %ud.%ud.%ud.%ud", | |
| 1516 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 1517 (addr >> 8) & 0xff, addr & 0xff); | |
| 1518 goto failed; | |
| 1519 } | |
| 1520 | |
| 1521 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 1522 | |
| 1523 if (ident != qident) { | |
| 1524 ngx_log_error(r->log_level, r->log, 0, | |
|
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1966
diff
changeset
|
1525 "wrong ident %ui response for %ud.%ud.%ud.%ud, expect %ui", |
|
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|
1526 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff, |
|
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diff
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|
1527 (addr >> 8) & 0xff, addr & 0xff, qident); |
| 1649 | 1528 goto failed; |
| 1529 } | |
| 1530 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1531 if (code == 0 && nan == 0) { |
|
268b81386fe4
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parents:
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diff
changeset
|
1532 code = 3; /* NXDOMAIN */ |
|
268b81386fe4
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diff
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|
1533 } |
|
268b81386fe4
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|
1534 |
| 1649 | 1535 if (code) { |
| 1536 next = rn->waiting; | |
| 1537 rn->waiting = NULL; | |
| 1538 | |
| 1539 ngx_queue_remove(&rn->queue); | |
| 1540 | |
| 1541 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 1542 | |
| 1543 ngx_resolver_free_node(r, rn); | |
| 1544 | |
| 1545 /* unlock addr mutex */ | |
| 1546 | |
| 1547 while (next) { | |
| 1548 ctx = next; | |
| 1549 ctx->state = code; | |
| 1550 next = ctx->next; | |
| 1551 | |
| 1552 ctx->handler(ctx); | |
| 1553 } | |
| 1554 | |
| 1555 return; | |
| 1556 } | |
| 1557 | |
| 1558 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t); | |
| 1559 | |
| 1560 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) { | |
| 1561 goto short_response; | |
| 1562 } | |
| 1563 | |
| 1564 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */ | |
| 1565 | |
| 1566 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) { | |
| 1567 err = "invalid in-addr.arpa name in DNS response"; | |
| 1568 goto invalid; | |
| 1569 } | |
| 1570 | |
| 1571 an = (ngx_resolver_an_t *) &buf[i + 2]; | |
| 1572 | |
| 1573 len = (an->len_hi << 8) + an->len_lo; | |
|
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Now nginx uses TTL of a DNS response when calculating cache validity.
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diff
changeset
|
1574 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:
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diff
changeset
|
1575 + (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:
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diff
changeset
|
1576 |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1577 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
|
1578 ttl = 0; |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
1579 } |
| 1649 | 1580 |
| 1581 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, | |
|
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fix building by gcc 4.6 without --with-debug
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diff
changeset
|
1582 "resolver qt:%ui cl:%ui len:%uz", |
|
159b58f9c0bd
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Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
1583 (an->type_hi << 8) + an->type_lo, |
|
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fix building by gcc 4.6 without --with-debug
Igor Sysoev <igor@sysoev.ru>
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diff
changeset
|
1584 (an->class_hi << 8) + an->class_lo, len); |
| 1649 | 1585 |
| 1586 i += 2 + sizeof(ngx_resolver_an_t); | |
| 1587 | |
| 1588 if (i + len > (ngx_uint_t) n) { | |
| 1589 goto short_response; | |
| 1590 } | |
| 1591 | |
| 1592 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) { | |
| 1593 return; | |
| 1594 } | |
| 1595 | |
| 1596 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name); | |
| 1597 | |
|
2486
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1598 if (name.len != (size_t) rn->nlen |
|
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1599 || ngx_strncmp(name.data, rn->name, name.len) != 0) |
| 1649 | 1600 { |
|
2482
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1601 if (rn->nlen) { |
|
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1602 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
|
1603 } |
|
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1604 |
|
2490
1c87647b7ca5
fix building by msvc, introduced in r2487
Igor Sysoev <igor@sysoev.ru>
parents:
2487
diff
changeset
|
1605 rn->nlen = (u_short) name.len; |
| 1649 | 1606 rn->name = name.data; |
| 1607 | |
|
2486
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1608 name.data = ngx_resolver_dup(r, rn->name, name.len); |
| 1649 | 1609 if (name.data == NULL) { |
| 1610 goto failed; | |
| 1611 } | |
| 1612 } | |
| 1613 | |
| 1614 ngx_queue_remove(&rn->queue); | |
| 1615 | |
|
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
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changeset
|
1616 rn->valid = ngx_time() + (r->valid ? r->valid : ttl); |
| 1649 | 1617 rn->expire = ngx_time() + r->expire; |
| 1618 | |
| 1619 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
| 1620 | |
| 1621 next = rn->waiting; | |
| 1622 rn->waiting = NULL; | |
| 1623 | |
| 1624 /* unlock addr mutex */ | |
| 1625 | |
| 1626 while (next) { | |
| 1627 ctx = next; | |
| 1628 ctx->state = NGX_OK; | |
| 1629 ctx->name = name; | |
| 1630 next = ctx->next; | |
| 1631 | |
| 1632 ctx->handler(ctx); | |
| 1633 } | |
| 1634 | |
| 1635 ngx_resolver_free(r, name.data); | |
| 1636 | |
| 1637 return; | |
| 1638 | |
| 1639 invalid_in_addr_arpa: | |
| 1640 | |
| 1641 ngx_log_error(r->log_level, r->log, 0, | |
| 1642 "invalid in-addr.arpa name in DNS response"); | |
| 1643 return; | |
| 1644 | |
| 1645 short_response: | |
| 1646 | |
| 1647 err = "short DNS response"; | |
| 1648 | |
| 1649 invalid: | |
| 1650 | |
| 1651 /* unlock addr mutex */ | |
| 1652 | |
| 1653 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1654 | |
| 1655 return; | |
| 1656 | |
| 1657 failed: | |
| 1658 | |
| 1659 /* unlock addr mutex */ | |
| 1660 | |
| 1661 return; | |
| 1662 } | |
| 1663 | |
| 1664 | |
| 1665 static ngx_resolver_node_t * | |
| 1666 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) | |
| 1667 { | |
| 1668 ngx_int_t rc; | |
| 1669 ngx_rbtree_node_t *node, *sentinel; | |
| 1670 ngx_resolver_node_t *rn; | |
| 1671 | |
| 1672 node = r->name_rbtree.root; | |
| 1673 sentinel = r->name_rbtree.sentinel; | |
| 1674 | |
| 1675 while (node != sentinel) { | |
| 1676 | |
| 1677 if (hash < node->key) { | |
| 1678 node = node->left; | |
| 1679 continue; | |
| 1680 } | |
| 1681 | |
| 1682 if (hash > node->key) { | |
| 1683 node = node->right; | |
| 1684 continue; | |
| 1685 } | |
| 1686 | |
| 1687 /* hash == node->key */ | |
| 1688 | |
| 1689 do { | |
| 1690 rn = (ngx_resolver_node_t *) node; | |
| 1691 | |
|
3143
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fix resolver cache rbtree comparison
Igor Sysoev <igor@sysoev.ru>
parents:
3139
diff
changeset
|
1692 rc = ngx_memn2cmp(name->data, rn->name, name->len, rn->nlen); |
| 1649 | 1693 |
| 1694 if (rc == 0) { | |
| 1695 return rn; | |
| 1696 } | |
| 1697 | |
| 1698 node = (rc < 0) ? node->left : node->right; | |
| 1699 | |
| 1700 } while (node != sentinel && hash == node->key); | |
| 1701 | |
| 1702 break; | |
| 1703 } | |
| 1704 | |
| 1705 /* not found */ | |
| 1706 | |
| 1707 return NULL; | |
| 1708 } | |
| 1709 | |
| 1710 | |
| 1711 static ngx_resolver_node_t * | |
| 1712 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr) | |
| 1713 { | |
| 1714 ngx_rbtree_node_t *node, *sentinel; | |
| 1715 | |
| 1716 node = r->addr_rbtree.root; | |
| 1717 sentinel = r->addr_rbtree.sentinel; | |
| 1718 | |
| 1719 while (node != sentinel) { | |
| 1720 | |
| 1721 if (addr < node->key) { | |
| 1722 node = node->left; | |
| 1723 continue; | |
| 1724 } | |
| 1725 | |
| 1726 if (addr > node->key) { | |
| 1727 node = node->right; | |
| 1728 continue; | |
| 1729 } | |
| 1730 | |
| 1731 /* addr == node->key */ | |
| 1732 | |
| 1733 return (ngx_resolver_node_t *) node; | |
| 1734 } | |
| 1735 | |
| 1736 /* not found */ | |
| 1737 | |
| 1738 return NULL; | |
| 1739 } | |
| 1740 | |
| 1741 | |
| 1742 static void | |
| 1743 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
| 1744 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
| 1745 { | |
| 1746 ngx_rbtree_node_t **p; | |
| 1747 ngx_resolver_node_t *rn, *rn_temp; | |
| 1748 | |
| 1749 for ( ;; ) { | |
| 1750 | |
| 1751 if (node->key < temp->key) { | |
| 1752 | |
| 1753 p = &temp->left; | |
| 1754 | |
| 1755 } else if (node->key > temp->key) { | |
| 1756 | |
| 1757 p = &temp->right; | |
| 1758 | |
| 1759 } else { /* node->key == temp->key */ | |
| 1760 | |
| 1761 rn = (ngx_resolver_node_t *) node; | |
| 1762 rn_temp = (ngx_resolver_node_t *) temp; | |
| 1763 | |
|
3143
ab6258e18099
fix resolver cache rbtree comparison
Igor Sysoev <igor@sysoev.ru>
parents:
3139
diff
changeset
|
1764 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
|
1765 < 0) ? &temp->left : &temp->right; |
| 1649 | 1766 } |
| 1767 | |
| 1768 if (*p == sentinel) { | |
| 1769 break; | |
| 1770 } | |
| 1771 | |
| 1772 temp = *p; | |
| 1773 } | |
| 1774 | |
| 1775 *p = node; | |
| 1776 node->parent = temp; | |
| 1777 node->left = sentinel; | |
| 1778 node->right = sentinel; | |
| 1779 ngx_rbt_red(node); | |
| 1780 } | |
| 1781 | |
| 1782 | |
| 1783 static ngx_int_t | |
| 1784 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1785 { | |
| 1786 u_char *p, *s; | |
|
3306
61bdaac6c668
fix resolving an empty name (".")
Igor Sysoev <igor@sysoev.ru>
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diff
changeset
|
1787 size_t len, nlen; |
| 1649 | 1788 ngx_uint_t ident; |
| 1789 ngx_resolver_qs_t *qs; | |
| 1790 ngx_resolver_query_t *query; | |
| 1791 | |
|
3306
61bdaac6c668
fix resolving an empty name (".")
Igor Sysoev <igor@sysoev.ru>
parents:
3299
diff
changeset
|
1792 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
|
1793 |
|
61bdaac6c668
fix resolving an empty name (".")
Igor Sysoev <igor@sysoev.ru>
parents:
3299
diff
changeset
|
1794 len = sizeof(ngx_resolver_query_t) + nlen + sizeof(ngx_resolver_qs_t); |
| 1649 | 1795 |
|
3307
34e99a97fbd6
use ngx_resolver_alloc() instead of ngx_resolver_calloc()
Igor Sysoev <igor@sysoev.ru>
parents:
3306
diff
changeset
|
1796 p = ngx_resolver_alloc(ctx->resolver, len); |
| 1649 | 1797 if (p == NULL) { |
| 1798 return NGX_ERROR; | |
| 1799 } | |
| 1800 | |
| 1801 rn->qlen = (u_short) len; | |
| 1802 rn->query = p; | |
| 1803 | |
| 1804 query = (ngx_resolver_query_t *) p; | |
| 1805 | |
| 1806 ident = ngx_random(); | |
| 1807 | |
| 1808 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0, | |
| 1809 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff); | |
| 1810 | |
| 1811 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1812 query->ident_lo = (u_char) (ident & 0xff); | |
| 1813 | |
| 1814 /* recursion query */ | |
| 1815 query->flags_hi = 1; query->flags_lo = 0; | |
| 1816 | |
| 1817 /* one question */ | |
| 1818 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1819 query->nan_hi = 0; query->nan_lo = 0; | |
| 1820 query->nns_hi = 0; query->nns_lo = 0; | |
| 1821 query->nar_hi = 0; query->nar_lo = 0; | |
| 1822 | |
|
3306
61bdaac6c668
fix resolving an empty name (".")
Igor Sysoev <igor@sysoev.ru>
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diff
changeset
|
1823 p += sizeof(ngx_resolver_query_t) + nlen; |
| 1649 | 1824 |
| 1825 qs = (ngx_resolver_qs_t *) p; | |
| 1826 | |
| 1827 /* query type */ | |
| 1828 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type; | |
| 1829 | |
| 1830 /* IP query class */ | |
| 1831 qs->class_hi = 0; qs->class_lo = 1; | |
| 1832 | |
| 1833 /* convert "www.example.com" to "\3www\7example\3com\0" */ | |
| 1834 | |
| 1835 len = 0; | |
| 1836 p--; | |
| 1837 *p-- = '\0'; | |
| 1838 | |
| 1839 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) { | |
| 1840 if (*s != '.') { | |
| 1841 *p = *s; | |
| 1842 len++; | |
| 1843 | |
| 1844 } else { | |
|
1961
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1845 if (len == 0) { |
|
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1846 return NGX_DECLINED; |
|
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|
1847 } |
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|
1848 |
| 1649 | 1849 *p = (u_char) len; |
| 1850 len = 0; | |
| 1851 } | |
| 1852 | |
| 1853 p--; | |
| 1854 } | |
| 1855 | |
| 1856 *p = (u_char) len; | |
| 1857 | |
| 1858 return NGX_OK; | |
| 1859 } | |
| 1860 | |
| 1861 | |
| 1862 /* AF_INET only */ | |
| 1863 | |
| 1864 static ngx_int_t | |
| 1865 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1866 { | |
| 1867 u_char *p, *d; | |
| 1868 size_t len; | |
| 1869 ngx_int_t n; | |
| 1870 ngx_uint_t ident; | |
| 1871 ngx_resolver_query_t *query; | |
| 1872 | |
| 1873 len = sizeof(ngx_resolver_query_t) | |
| 1874 + sizeof(".255.255.255.255.in-addr.arpa.") - 1 | |
| 1875 + sizeof(ngx_resolver_qs_t); | |
| 1876 | |
|
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1877 p = ngx_resolver_alloc(ctx->resolver, len); |
| 1649 | 1878 if (p == NULL) { |
| 1879 return NGX_ERROR; | |
| 1880 } | |
| 1881 | |
| 1882 rn->query = p; | |
| 1883 query = (ngx_resolver_query_t *) p; | |
| 1884 | |
| 1885 ident = ngx_random(); | |
| 1886 | |
| 1887 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1888 query->ident_lo = (u_char) (ident & 0xff); | |
| 1889 | |
| 1890 /* recursion query */ | |
| 1891 query->flags_hi = 1; query->flags_lo = 0; | |
| 1892 | |
| 1893 /* one question */ | |
| 1894 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1895 query->nan_hi = 0; query->nan_lo = 0; | |
| 1896 query->nns_hi = 0; query->nns_lo = 0; | |
| 1897 query->nar_hi = 0; query->nar_lo = 0; | |
| 1898 | |
| 1899 p += sizeof(ngx_resolver_query_t); | |
| 1900 | |
| 3642 | 1901 for (n = 0; n < 32; n += 8) { |
| 1649 | 1902 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff); |
| 1903 *p = (u_char) (d - &p[1]); | |
| 1904 p = d; | |
| 1905 } | |
| 1906 | |
| 1907 /* query type "PTR", IP query class */ | |
| 1908 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18); | |
| 1909 | |
| 1910 rn->qlen = (u_short) | |
| 1911 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t) | |
| 1912 - rn->query); | |
| 1913 | |
| 1914 return NGX_OK; | |
| 1915 } | |
| 1916 | |
| 1917 | |
| 1918 static ngx_int_t | |
| 1919 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src, | |
| 1920 u_char *last) | |
| 1921 { | |
| 1922 char *err; | |
| 1923 u_char *p, *dst; | |
| 1924 ssize_t len; | |
| 1925 ngx_uint_t i, n; | |
| 1926 | |
| 1927 p = src; | |
| 1928 len = -1; | |
| 1929 | |
| 1930 /* | |
| 1931 * compression pointers allow to create endless loop, so we set limit; | |
| 1932 * 128 pointers should be enough to store 255-byte name | |
| 1933 */ | |
| 1934 | |
| 1935 for (i = 0; i < 128; i++) { | |
| 1936 n = *p++; | |
| 1937 | |
| 1938 if (n == 0) { | |
| 1939 goto done; | |
| 1940 } | |
| 1941 | |
| 1942 if (n & 0xc0) { | |
|
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1943 n = ((n & 0x3f) << 8) + *p; |
| 1649 | 1944 p = &buf[n]; |
| 1945 | |
| 1946 } else { | |
| 1947 len += 1 + n; | |
| 1948 p = &p[n]; | |
| 1949 } | |
| 1950 | |
| 1951 if (p >= last) { | |
| 1952 err = "name is out of response"; | |
| 1953 goto invalid; | |
| 1954 } | |
| 1955 } | |
| 1956 | |
| 1957 err = "compression pointers loop"; | |
| 1958 | |
| 1959 invalid: | |
| 1960 | |
| 1961 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1962 | |
| 1963 return NGX_ERROR; | |
| 1964 | |
| 1965 done: | |
| 1966 | |
| 1967 if (name == NULL) { | |
| 583 | 1968 return NGX_OK; |
| 1969 } | |
| 1970 | |
|
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1971 if (len == -1) { |
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1972 name->len = 0; |
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1973 name->data = NULL; |
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1974 return NGX_OK; |
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1975 } |
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|
1976 |
| 1649 | 1977 dst = ngx_resolver_alloc(r, len); |
| 1978 if (dst == NULL) { | |
| 1979 return NGX_ERROR; | |
| 1980 } | |
| 1981 | |
| 1982 name->data = dst; | |
| 1983 | |
| 1984 n = *src++; | |
| 1985 | |
| 1986 for ( ;; ) { | |
|
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|
1987 if (n & 0xc0) { |
|
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|
1988 n = ((n & 0x3f) << 8) + *src; |
|
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|
1989 src = &buf[n]; |
|
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|
1990 |
|
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1991 n = *src++; |
|
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|
1992 |
|
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|
1993 } else { |
| 1649 | 1994 ngx_memcpy(dst, src, n); |
| 1995 dst += n; | |
| 1996 src += n; | |
| 1997 | |
| 1998 n = *src++; | |
| 1999 | |
| 2000 if (n != 0) { | |
| 2001 *dst++ = '.'; | |
| 2002 } | |
| 2003 } | |
| 2004 | |
| 2005 if (n == 0) { | |
| 2006 name->len = dst - name->data; | |
| 2007 return NGX_OK; | |
| 2008 } | |
| 2009 } | |
| 2010 } | |
| 2011 | |
| 2012 | |
| 2013 static void | |
| 2014 ngx_resolver_timeout_handler(ngx_event_t *ev) | |
| 2015 { | |
| 2016 ngx_resolver_ctx_t *ctx; | |
| 2017 | |
| 2018 ctx = ev->data; | |
| 2019 | |
| 2020 ctx->state = NGX_RESOLVE_TIMEDOUT; | |
| 2021 | |
| 2022 ctx->handler(ctx); | |
| 2023 } | |
| 2024 | |
| 2025 | |
| 2026 static void | |
| 2027 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 2028 { | |
| 2029 /* lock alloc mutex */ | |
| 2030 | |
| 2031 if (rn->query) { | |
| 2032 ngx_resolver_free_locked(r, rn->query); | |
| 2033 } | |
| 2034 | |
| 2035 if (rn->name) { | |
| 2036 ngx_resolver_free_locked(r, rn->name); | |
| 2037 } | |
| 2038 | |
| 2039 if (rn->cnlen) { | |
| 2040 ngx_resolver_free_locked(r, rn->u.cname); | |
| 2041 } | |
| 2042 | |
| 2043 if (rn->naddrs > 1) { | |
| 2044 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 2045 } | |
| 2046 | |
| 2047 ngx_resolver_free_locked(r, rn); | |
| 2048 | |
| 2049 /* unlock alloc mutex */ | |
| 2050 } | |
| 2051 | |
| 2052 | |
| 2053 static void * | |
| 2054 ngx_resolver_alloc(ngx_resolver_t *r, size_t size) | |
| 2055 { | |
| 2056 u_char *p; | |
| 2057 | |
| 2058 /* lock alloc mutex */ | |
| 2059 | |
| 2060 p = ngx_alloc(size, r->log); | |
| 2061 | |
| 2062 /* unlock alloc mutex */ | |
| 2063 | |
| 2064 return p; | |
| 2065 } | |
| 2066 | |
| 2067 | |
| 1903 | 2068 static void * |
| 1649 | 2069 ngx_resolver_calloc(ngx_resolver_t *r, size_t size) |
| 2070 { | |
| 2071 u_char *p; | |
| 2072 | |
| 2073 p = ngx_resolver_alloc(r, size); | |
| 2074 | |
| 2075 if (p) { | |
| 2076 ngx_memzero(p, size); | |
| 2077 } | |
| 2078 | |
| 2079 return p; | |
| 2080 } | |
| 2081 | |
| 2082 | |
| 2083 static void | |
| 2084 ngx_resolver_free(ngx_resolver_t *r, void *p) | |
| 2085 { | |
| 2086 /* lock alloc mutex */ | |
| 2087 | |
| 2088 ngx_free(p); | |
| 2089 | |
| 2090 /* unlock alloc mutex */ | |
| 2091 } | |
| 2092 | |
| 2093 | |
| 2094 static void | |
| 2095 ngx_resolver_free_locked(ngx_resolver_t *r, void *p) | |
| 2096 { | |
| 2097 ngx_free(p); | |
| 2098 } | |
| 2099 | |
| 2100 | |
| 2101 static void * | |
| 2102 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size) | |
| 2103 { | |
| 2104 void *dst; | |
| 2105 | |
| 2106 dst = ngx_resolver_alloc(r, size); | |
| 2107 | |
| 2108 if (dst == NULL) { | |
| 2109 return dst; | |
| 2110 } | |
| 2111 | |
| 2112 ngx_memcpy(dst, src, size); | |
| 2113 | |
| 2114 return dst; | |
| 2115 } | |
| 2116 | |
| 2117 | |
| 2118 char * | |
| 2119 ngx_resolver_strerror(ngx_int_t err) | |
| 2120 { | |
| 2121 static char *errors[] = { | |
| 2122 "Format error", /* FORMERR */ | |
| 2123 "Server failure", /* SERVFAIL */ | |
| 2124 "Host not found", /* NXDOMAIN */ | |
| 2125 "Unimplemented", /* NOTIMP */ | |
| 2126 "Operation refused" /* REFUSED */ | |
| 2127 }; | |
| 2128 | |
| 2129 if (err > 0 && err < 6) { | |
| 2130 return errors[err - 1]; | |
| 2131 } | |
| 2132 | |
| 2133 if (err == NGX_RESOLVE_TIMEDOUT) { | |
| 2134 return "Operation timed out"; | |
| 2135 } | |
| 2136 | |
| 2137 return "Unknown error"; | |
| 2138 } | |
| 2139 | |
| 2140 | |
|
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|
2141 static u_char * |
|
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|
2142 ngx_resolver_log_error(ngx_log_t *log, u_char *buf, size_t len) |
|
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|
2143 { |
|
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|
2144 u_char *p; |
|
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|
2145 ngx_udp_connection_t *uc; |
|
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|
2146 |
|
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|
2147 p = buf; |
|
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|
2148 |
|
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|
2149 if (log->action) { |
|
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|
2150 p = ngx_snprintf(buf, len, " while %s", log->action); |
|
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|
2151 len -= p - buf; |
|
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|
2152 } |
|
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|
2153 |
|
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|
2154 uc = log->data; |
|
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|
2155 |
|
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|
2156 if (uc) { |
|
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|
2157 p = ngx_snprintf(p, len, ", resolver: %V", &uc->server); |
|
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2158 } |
|
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|
2159 |
|
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|
2160 return p; |
|
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|
2161 } |
|
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2162 |
|
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|
2163 |
| 1649 | 2164 ngx_int_t |
| 2165 ngx_udp_connect(ngx_udp_connection_t *uc) | |
| 2166 { | |
| 2167 int rc; | |
| 2168 ngx_int_t event; | |
| 2169 ngx_event_t *rev, *wev; | |
| 2170 ngx_socket_t s; | |
| 2171 ngx_connection_t *c; | |
| 2172 | |
| 583 | 2173 s = ngx_socket(AF_INET, SOCK_DGRAM, 0); |
| 2174 | |
|
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2175 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, &uc->log, 0, "UDP socket %d", s); |
| 583 | 2176 |
| 2177 if (s == -1) { | |
|
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2178 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
| 583 | 2179 ngx_socket_n " failed"); |
| 2180 return NGX_ERROR; | |
| 2181 } | |
| 2182 | |
|
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2183 c = ngx_get_connection(s, &uc->log); |
| 583 | 2184 |
| 2185 if (c == NULL) { | |
| 2186 if (ngx_close_socket(s) == -1) { | |
|
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2187 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
| 583 | 2188 ngx_close_socket_n "failed"); |
| 2189 } | |
| 2190 | |
| 2191 return NGX_ERROR; | |
| 2192 } | |
| 2193 | |
| 1649 | 2194 if (ngx_nonblocking(s) == -1) { |
|
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2195 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
| 1649 | 2196 ngx_nonblocking_n " failed"); |
| 2197 | |
| 2198 ngx_free_connection(c); | |
| 2199 | |
| 2200 if (ngx_close_socket(s) == -1) { | |
|
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2201 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
| 1649 | 2202 ngx_close_socket_n " failed"); |
| 2203 } | |
| 2204 | |
| 2205 return NGX_ERROR; | |
| 2206 } | |
| 2207 | |
| 583 | 2208 rev = c->read; |
| 2209 wev = c->write; | |
| 2210 | |
|
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2211 rev->log = &uc->log; |
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2212 wev->log = &uc->log; |
| 1649 | 2213 |
| 2214 uc->connection = c; | |
| 583 | 2215 |
| 2216 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); | |
| 2217 | |
| 2218 #if (NGX_THREADS) | |
| 1649 | 2219 |
| 2220 /* TODO: lock event when call completion handler */ | |
| 2221 | |
| 2222 rev->lock = &c->lock; | |
| 2223 wev->lock = &c->lock; | |
| 583 | 2224 rev->own_lock = &c->lock; |
| 2225 wev->own_lock = &c->lock; | |
| 1649 | 2226 |
| 583 | 2227 #endif |
| 2228 | |
|
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2229 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, &uc->log, 0, |
| 1649 | 2230 "connect to %V, fd:%d #%d", &uc->server, s, c->number); |
| 2231 | |
| 2232 rc = connect(s, uc->sockaddr, uc->socklen); | |
| 2233 | |
| 2234 /* TODO: aio, iocp */ | |
| 583 | 2235 |
| 2236 if (rc == -1) { | |
|
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2237 ngx_log_error(NGX_LOG_CRIT, &uc->log, ngx_socket_errno, |
|
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|
2238 "connect() failed"); |
| 583 | 2239 |
| 2240 return NGX_ERROR; | |
| 2241 } | |
| 2242 | |
| 1649 | 2243 /* UDP sockets are always ready to write */ |
| 2244 wev->ready = 1; | |
| 2245 | |
| 2246 if (ngx_add_event) { | |
| 2247 | |
| 2248 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ? | |
| 2249 /* kqueue, epoll */ NGX_CLEAR_EVENT: | |
| 2250 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT; | |
| 2251 /* eventport event type has no meaning: oneshot only */ | |
| 2252 | |
| 2253 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { | |
| 2254 return NGX_ERROR; | |
| 2255 } | |
| 2256 | |
| 2257 } else { | |
| 2258 /* rtsig */ | |
| 2259 | |
| 583 | 2260 if (ngx_add_conn(c) == NGX_ERROR) { |
| 2261 return NGX_ERROR; | |
| 2262 } | |
| 2263 } | |
| 2264 | |
| 2265 return NGX_OK; | |
| 2266 } |