Mercurial > hg > nginx
annotate src/core/ngx_resolver.c @ 4474:41f640a693de
Time parsing cleanup.
Nuke NGX_PARSE_LARGE_TIME, it's not used since 0.6.30. The only error
ngx_parse_time() can currently return is NGX_ERROR, check it explicitly
and make sure to cast it to appropriate type (either time_t or ngx_msec_t)
to avoid signedness warnings on platforms with unsigned time_t (notably QNX).
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Mon, 13 Feb 2012 15:41:11 +0000 |
| parents | d620f497c50f |
| children | be6c250b827b |
| rev | line source |
|---|---|
| 583 | 1 |
| 2 /* | |
| 3 * Copyright (C) Igor Sysoev | |
| 4412 | 4 * Copyright (C) Nginx, Inc. |
| 583 | 5 */ |
| 6 | |
| 7 | |
| 8 #include <ngx_config.h> | |
| 9 #include <ngx_core.h> | |
| 10 #include <ngx_event.h> | |
| 11 | |
| 12 | |
| 1649 | 13 #define NGX_RESOLVER_UDP_SIZE 4096 |
| 14 | |
| 15 | |
| 583 | 16 typedef struct { |
| 1649 | 17 u_char ident_hi; |
| 18 u_char ident_lo; | |
| 19 u_char flags_hi; | |
| 20 u_char flags_lo; | |
| 21 u_char nqs_hi; | |
| 22 u_char nqs_lo; | |
| 23 u_char nan_hi; | |
| 24 u_char nan_lo; | |
| 25 u_char nns_hi; | |
| 26 u_char nns_lo; | |
| 27 u_char nar_hi; | |
| 28 u_char nar_lo; | |
| 29 } ngx_resolver_query_t; | |
| 30 | |
| 31 | |
| 32 typedef struct { | |
| 33 u_char type_hi; | |
| 34 u_char type_lo; | |
| 35 u_char class_hi; | |
| 36 u_char class_lo; | |
| 37 } ngx_resolver_qs_t; | |
| 38 | |
| 39 | |
| 40 typedef struct { | |
| 41 u_char type_hi; | |
| 42 u_char type_lo; | |
| 43 u_char class_hi; | |
| 44 u_char class_lo; | |
| 45 u_char ttl[4]; | |
| 46 u_char len_hi; | |
| 47 u_char len_lo; | |
| 48 } ngx_resolver_an_t; | |
| 49 | |
| 50 | |
| 51 ngx_int_t ngx_udp_connect(ngx_udp_connection_t *uc); | |
| 52 | |
| 53 | |
| 1906 | 54 static void ngx_resolver_cleanup(void *data); |
| 55 static void ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree); | |
| 1649 | 56 static ngx_int_t ngx_resolve_name_locked(ngx_resolver_t *r, |
| 57 ngx_resolver_ctx_t *ctx); | |
| 58 static void ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
| 59 ngx_queue_t *queue); | |
| 60 static ngx_int_t ngx_resolver_send_query(ngx_resolver_t *r, | |
| 61 ngx_resolver_node_t *rn); | |
| 62 static ngx_int_t ngx_resolver_create_name_query(ngx_resolver_node_t *rn, | |
| 63 ngx_resolver_ctx_t *ctx); | |
| 64 static ngx_int_t ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, | |
| 65 ngx_resolver_ctx_t *ctx); | |
| 66 static void ngx_resolver_resend_handler(ngx_event_t *ev); | |
| 67 static time_t ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
| 68 ngx_queue_t *queue); | |
| 69 static void ngx_resolver_read_response(ngx_event_t *rev); | |
| 70 static void ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, | |
| 71 size_t n); | |
| 72 static void ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t n, | |
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73 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans); |
| 1649 | 74 static void ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, |
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75 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan); |
| 1649 | 76 static ngx_resolver_node_t *ngx_resolver_lookup_name(ngx_resolver_t *r, |
| 77 ngx_str_t *name, uint32_t hash); | |
| 78 static ngx_resolver_node_t *ngx_resolver_lookup_addr(ngx_resolver_t *r, | |
| 79 in_addr_t addr); | |
| 80 static void ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
| 81 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel); | |
| 82 static ngx_int_t ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, | |
| 83 u_char *buf, u_char *src, u_char *last); | |
| 84 static void ngx_resolver_timeout_handler(ngx_event_t *ev); | |
| 85 static void ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn); | |
| 86 static void *ngx_resolver_alloc(ngx_resolver_t *r, size_t size); | |
| 1903 | 87 static void *ngx_resolver_calloc(ngx_resolver_t *r, size_t size); |
| 1649 | 88 static void ngx_resolver_free(ngx_resolver_t *r, void *p); |
| 89 static void ngx_resolver_free_locked(ngx_resolver_t *r, void *p); | |
| 90 static void *ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size); | |
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91 static u_char *ngx_resolver_log_error(ngx_log_t *log, u_char *buf, size_t len); |
| 1649 | 92 |
| 93 | |
| 94 ngx_resolver_t * | |
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95 ngx_resolver_create(ngx_conf_t *cf, ngx_str_t *names, ngx_uint_t n) |
| 1649 | 96 { |
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97 ngx_str_t s; |
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98 ngx_url_t u; |
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99 ngx_uint_t i; |
| 1649 | 100 ngx_resolver_t *r; |
| 1906 | 101 ngx_pool_cleanup_t *cln; |
| 1649 | 102 ngx_udp_connection_t *uc; |
| 103 | |
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104 cln = ngx_pool_cleanup_add(cf->pool, 0); |
| 1906 | 105 if (cln == NULL) { |
| 106 return NULL; | |
| 107 } | |
| 108 | |
| 109 cln->handler = ngx_resolver_cleanup; | |
| 110 | |
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111 r = ngx_calloc(sizeof(ngx_resolver_t), cf->log); |
| 1649 | 112 if (r == NULL) { |
| 113 return NULL; | |
| 114 } | |
| 115 | |
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116 if (n) { |
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117 if (ngx_array_init(&r->udp_connections, cf->pool, n, |
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118 sizeof(ngx_udp_connection_t)) |
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119 != NGX_OK) |
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120 { |
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121 return NULL; |
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122 } |
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123 } |
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124 |
| 1906 | 125 cln->data = r; |
| 126 | |
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127 r->event = ngx_calloc(sizeof(ngx_event_t), cf->log); |
| 1649 | 128 if (r->event == NULL) { |
| 129 return NULL; | |
| 130 } | |
| 131 | |
| 1687 | 132 ngx_rbtree_init(&r->name_rbtree, &r->name_sentinel, |
| 133 ngx_resolver_rbtree_insert_value); | |
| 134 | |
| 135 ngx_rbtree_init(&r->addr_rbtree, &r->addr_sentinel, | |
| 136 ngx_rbtree_insert_value); | |
| 1649 | 137 |
| 1685 | 138 ngx_queue_init(&r->name_resend_queue); |
| 139 ngx_queue_init(&r->addr_resend_queue); | |
| 140 | |
| 141 ngx_queue_init(&r->name_expire_queue); | |
| 142 ngx_queue_init(&r->addr_expire_queue); | |
| 1649 | 143 |
| 144 r->event->handler = ngx_resolver_resend_handler; | |
| 145 r->event->data = r; | |
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146 r->event->log = &cf->cycle->new_log; |
| 1649 | 147 r->ident = -1; |
| 148 | |
| 149 r->resend_timeout = 5; | |
| 150 r->expire = 30; | |
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151 r->valid = 0; |
| 1649 | 152 |
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153 r->log = &cf->cycle->new_log; |
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154 r->log_level = NGX_LOG_ERR; |
| 1649 | 155 |
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156 for (i = 0; i < n; i++) { |
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157 if (ngx_strncmp(names[i].data, "valid=", 6) == 0) { |
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158 s.len = names[i].len - 6; |
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159 s.data = names[i].data + 6; |
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160 |
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161 r->valid = ngx_parse_time(&s, 1); |
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162 |
| 4474 | 163 if (r->valid == (time_t) NGX_ERROR) { |
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164 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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165 "invalid parameter: %V", &names[i]); |
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166 return NULL; |
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167 } |
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168 |
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169 continue; |
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170 } |
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171 |
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172 ngx_memzero(&u, sizeof(ngx_url_t)); |
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173 |
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174 u.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 | |
|
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287 if (r->udp_connections.nelts == 0) { |
|
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|
288 return NGX_NO_RESOLVER; |
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289 } |
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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 | |
|
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538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
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331 /* NGX_ERROR */ |
| 1649 | 332 |
| 333 if (ctx->event) { | |
|
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334 ngx_resolver_free(r, ctx->event); |
| 1649 | 335 } |
| 336 | |
|
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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 | |
|
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538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
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parents:
1903
diff
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|
398 /* lock alloc mutex */ |
|
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parents:
1903
diff
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|
399 |
|
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400 if (ctx->event) { |
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538f06aa8118
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|
401 ngx_resolver_free_locked(r, ctx->event); |
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402 } |
|
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|
403 |
|
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|
404 ngx_resolver_free_locked(r, ctx); |
|
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diff
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|
405 |
|
538f06aa8118
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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
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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
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fix memory leak on resolver query send failure
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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
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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
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1960
diff
changeset
|
554 rc = ngx_resolver_create_name_query(rn, ctx); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
555 |
|
99b9feacccb4
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1960
diff
changeset
|
556 if (rc == NGX_ERROR) { |
| 1649 | 557 goto failed; |
| 558 } | |
| 559 | |
|
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
560 if (rc == NGX_DECLINED) { |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
561 ngx_rbtree_delete(&r->name_rbtree, &rn->node); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
562 |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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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
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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
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parents:
1960
diff
changeset
|
567 ctx->state = NGX_RESOLVE_NXDOMAIN; |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
568 ctx->handler(ctx); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
569 |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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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
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parents:
1914
diff
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|
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
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parents:
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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>
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2483
diff
changeset
|
651 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
|
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
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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; |
|
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|
1054 q = ngx_queue_next(q)) |
|
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diff
changeset
|
1055 { |
|
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|
1056 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); |
|
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diff
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|
1057 qident = (rn->query[0] << 8) + rn->query[1]; |
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|
1058 |
|
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1059 if (qident == ident) { |
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diff
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|
1060 ngx_log_error(r->log_level, r->log, 0, |
|
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1061 "DNS error (%ui: %s), query id:%ui, name:\"%*s\"", |
|
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|
1062 code, ngx_resolver_strerror(code), ident, |
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|
1063 rn->nlen, rn->name); |
|
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diff
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|
1064 return; |
|
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diff
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|
1065 } |
|
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|
1066 } |
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|
1067 |
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diff
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|
1068 goto dns_error; |
|
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diff
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|
1069 } |
|
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|
1070 |
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|
1071 if (code > NGX_RESOLVE_REFUSED) { |
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|
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, | |
|
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diff
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|
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, | |
|
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|
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
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no answers in DNS response should be NXDOMAIN
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changeset
|
1125 i + sizeof(ngx_resolver_qs_t)); |
| 1649 | 1126 |
| 1127 break; | |
| 1128 | |
| 1129 case NGX_RESOLVE_PTR: | |
| 1130 | |
|
1742
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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, | |
|
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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
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|
1152 |
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|
1153 dns_error: |
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diff
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|
1154 |
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|
1155 ngx_log_error(r->log_level, r->log, 0, |
|
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diff
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|
1156 "DNS error (%ui: %s), query id:%ui", |
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|
1157 code, ngx_resolver_strerror(code), ident); |
|
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show name for a FORMERR DNS response
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|
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; | |
|
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|
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
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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>
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1741
diff
changeset
|
1207 if (code == 0 && nan == 0) { |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
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diff
changeset
|
1208 code = 3; /* NXDOMAIN */ |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
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diff
changeset
|
1209 } |
|
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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; | |
|
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Silenced a warning for some compilers.
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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; | |
|
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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>
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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.
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parents:
4267
diff
changeset
|
1284 ttl = 0; |
|
05031fce7ce8
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Ruslan Ermilov <ru@nginx.com>
parents:
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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
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Now nginx uses TTL of a DNS response when calculating cache validity.
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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 | |
|
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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
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Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
1428 |
|
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Now nginx uses TTL of a DNS response when calculating cache validity.
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|
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, | |
|
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use correct ngx_sprintf() formats
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diff
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1447 "no A or CNAME types in DNS responses, unknown query type: %ui", |
|
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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, | |
|
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no answers in DNS response should be NXDOMAIN
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parents:
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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; | |
|
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Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
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|
1480 int32_t ttl; |
| 1649 | 1481 ngx_int_t digit; |
| 1482 ngx_str_t name; | |
|
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fix building by gcc 4.6 without --with-debug
Igor Sysoev <igor@sysoev.ru>
parents:
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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, | |
|
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diff
changeset
|
1527 "wrong ident %ui response for %ud.%ud.%ud.%ud, expect %ui", |
|
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changeset
|
1528 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff, |
|
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diff
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|
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
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parents:
1741
diff
changeset
|
1534 code = 3; /* NXDOMAIN */ |
|
268b81386fe4
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diff
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|
1535 } |
|
268b81386fe4
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|
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; | |
|
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|
1576 ttl = (an->ttl[0] << 24) + (an->ttl[1] << 16) |
|
05031fce7ce8
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parents:
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diff
changeset
|
1577 + (an->ttl[2] << 8) + (an->ttl[3]); |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
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parents:
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diff
changeset
|
1578 |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
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parents:
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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:
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diff
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|
1580 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
|
1581 } |
| 1649 | 1582 |
| 1583 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
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|
1584 "resolver qt:%ui cl:%ui len:%uz", |
|
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fix building by gcc 4.6 without --with-debug
Igor Sysoev <igor@sysoev.ru>
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diff
changeset
|
1585 (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
|
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 | |
|
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8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1600 if (name.len != (size_t) rn->nlen |
|
8de5dc3e7001
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Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1601 || ngx_strncmp(name.data, rn->name, name.len) != 0) |
| 1649 | 1602 { |
|
2482
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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 | |
|
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|
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
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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; | |
|
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61bdaac6c668
fix resolving an empty name (".")
Igor Sysoev <igor@sysoev.ru>
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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>
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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:
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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>
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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
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1847 if (len == 0) { |
|
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1848 return NGX_DECLINED; |
|
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1849 } |
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|
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 | |
|
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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) { | |
|
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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 | |
|
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1973 if (len == -1) { |
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1974 name->len = 0; |
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1975 name->data = NULL; |
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1976 return NGX_OK; |
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1977 } |
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|
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 ( ;; ) { | |
|
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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 | |
|
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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); |
|
71193a456616
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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 | |
|
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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) { | |
|
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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 | |
|
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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) { | |
|
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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) { |
|
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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) { | |
|
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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 | |
|
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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) { | |
|
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2239 ngx_log_error(NGX_LOG_CRIT, &uc->log, ngx_socket_errno, |
|
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changeset
|
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 } |