Mercurial > hg > nginx
annotate src/core/ngx_resolver.c @ 4892:063ac68d89dc
Resolver: added missing memory allocation error handling.
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Wed, 24 Oct 2012 14:07:08 +0000 |
| parents | c85cefbdaafe |
| children | 3d2d3e1cf427 |
| 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 in_addr_t *ngx_resolver_rotate(ngx_resolver_t *r, in_addr_t *src, |
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92 ngx_uint_t n); |
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93 static u_char *ngx_resolver_log_error(ngx_log_t *log, u_char *buf, size_t len); |
| 1649 | 94 |
| 95 | |
| 96 ngx_resolver_t * | |
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97 ngx_resolver_create(ngx_conf_t *cf, ngx_str_t *names, ngx_uint_t n) |
| 1649 | 98 { |
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99 ngx_str_t s; |
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100 ngx_url_t u; |
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101 ngx_uint_t i, j; |
| 1649 | 102 ngx_resolver_t *r; |
| 1906 | 103 ngx_pool_cleanup_t *cln; |
| 1649 | 104 ngx_udp_connection_t *uc; |
| 105 | |
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106 cln = ngx_pool_cleanup_add(cf->pool, 0); |
| 1906 | 107 if (cln == NULL) { |
| 108 return NULL; | |
| 109 } | |
| 110 | |
| 111 cln->handler = ngx_resolver_cleanup; | |
| 112 | |
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113 r = ngx_calloc(sizeof(ngx_resolver_t), cf->log); |
| 1649 | 114 if (r == NULL) { |
| 115 return NULL; | |
| 116 } | |
| 117 | |
| 1906 | 118 cln->data = r; |
| 119 | |
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120 r->event = ngx_calloc(sizeof(ngx_event_t), cf->log); |
| 1649 | 121 if (r->event == NULL) { |
| 122 return NULL; | |
| 123 } | |
| 124 | |
| 1687 | 125 ngx_rbtree_init(&r->name_rbtree, &r->name_sentinel, |
| 126 ngx_resolver_rbtree_insert_value); | |
| 127 | |
| 128 ngx_rbtree_init(&r->addr_rbtree, &r->addr_sentinel, | |
| 129 ngx_rbtree_insert_value); | |
| 1649 | 130 |
| 1685 | 131 ngx_queue_init(&r->name_resend_queue); |
| 132 ngx_queue_init(&r->addr_resend_queue); | |
| 133 | |
| 134 ngx_queue_init(&r->name_expire_queue); | |
| 135 ngx_queue_init(&r->addr_expire_queue); | |
| 1649 | 136 |
| 137 r->event->handler = ngx_resolver_resend_handler; | |
| 138 r->event->data = r; | |
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139 r->event->log = &cf->cycle->new_log; |
| 1649 | 140 r->ident = -1; |
| 141 | |
| 142 r->resend_timeout = 5; | |
| 143 r->expire = 30; | |
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144 r->valid = 0; |
| 1649 | 145 |
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146 r->log = &cf->cycle->new_log; |
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147 r->log_level = NGX_LOG_ERR; |
| 1649 | 148 |
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149 if (n) { |
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150 if (ngx_array_init(&r->udp_connections, cf->pool, n, |
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151 sizeof(ngx_udp_connection_t)) |
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152 != NGX_OK) |
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153 { |
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154 return NULL; |
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155 } |
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156 } |
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157 |
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158 for (i = 0; i < n; i++) { |
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159 if (ngx_strncmp(names[i].data, "valid=", 6) == 0) { |
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160 s.len = names[i].len - 6; |
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161 s.data = names[i].data + 6; |
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162 |
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163 r->valid = ngx_parse_time(&s, 1); |
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164 |
| 4474 | 165 if (r->valid == (time_t) NGX_ERROR) { |
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166 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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167 "invalid parameter: %V", &names[i]); |
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168 return NULL; |
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169 } |
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170 |
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171 continue; |
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172 } |
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173 |
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174 ngx_memzero(&u, sizeof(ngx_url_t)); |
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175 |
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176 u.url = names[i]; |
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177 u.default_port = 53; |
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178 |
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179 if (ngx_parse_url(cf->pool, &u) != NGX_OK) { |
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180 if (u.err) { |
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181 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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182 "%s in resolver \"%V\"", |
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183 u.err, &u.url); |
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184 } |
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185 |
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186 return NULL; |
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187 } |
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188 |
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189 uc = ngx_array_push_n(&r->udp_connections, u.naddrs); |
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190 if (uc == NULL) { |
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191 return NULL; |
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192 } |
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193 |
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194 ngx_memzero(uc, u.naddrs * sizeof(ngx_udp_connection_t)); |
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195 |
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196 for (j = 0; j < u.naddrs; j++) { |
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197 uc[j].sockaddr = u.addrs[j].sockaddr; |
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198 uc[j].socklen = u.addrs[j].socklen; |
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199 uc[j].server = u.addrs[j].name; |
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200 } |
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201 } |
| 1649 | 202 |
| 203 return r; | |
| 204 } | |
| 205 | |
| 206 | |
| 1906 | 207 static void |
| 208 ngx_resolver_cleanup(void *data) | |
| 209 { | |
| 210 ngx_resolver_t *r = data; | |
| 211 | |
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212 ngx_uint_t i; |
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213 ngx_udp_connection_t *uc; |
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214 |
| 1906 | 215 if (r) { |
| 216 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, | |
| 217 "cleanup resolver"); | |
| 218 | |
| 219 ngx_resolver_cleanup_tree(r, &r->name_rbtree); | |
| 220 | |
| 221 ngx_resolver_cleanup_tree(r, &r->addr_rbtree); | |
| 222 | |
| 223 if (r->event) { | |
| 224 ngx_free(r->event); | |
| 225 } | |
| 226 | |
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227 |
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228 uc = r->udp_connections.elts; |
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229 |
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230 for (i = 0; i < r->udp_connections.nelts; i++) { |
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231 if (uc[i].connection) { |
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232 ngx_close_connection(uc[i].connection); |
| 1906 | 233 } |
| 234 } | |
| 235 | |
| 236 ngx_free(r); | |
| 237 } | |
| 238 } | |
| 239 | |
| 240 | |
| 241 static void | |
| 242 ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree) | |
| 243 { | |
| 244 ngx_resolver_ctx_t *ctx, *next; | |
| 245 ngx_resolver_node_t *rn; | |
| 246 | |
| 247 while (tree->root != tree->sentinel) { | |
| 248 | |
| 249 rn = (ngx_resolver_node_t *) ngx_rbtree_min(tree->root, tree->sentinel); | |
| 250 | |
| 251 ngx_queue_remove(&rn->queue); | |
| 252 | |
| 253 for (ctx = rn->waiting; ctx; ctx = next) { | |
|
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254 next = ctx->next; |
| 1906 | 255 |
| 256 if (ctx->event) { | |
| 257 ngx_resolver_free(r, ctx->event); | |
| 258 } | |
| 259 | |
| 260 ngx_resolver_free(r, ctx); | |
| 261 } | |
| 262 | |
| 263 ngx_rbtree_delete(tree, &rn->node); | |
| 264 | |
| 265 ngx_resolver_free_node(r, rn); | |
| 266 } | |
| 267 } | |
| 268 | |
| 269 | |
| 1649 | 270 ngx_resolver_ctx_t * |
| 271 ngx_resolve_start(ngx_resolver_t *r, ngx_resolver_ctx_t *temp) | |
| 272 { | |
| 273 in_addr_t addr; | |
| 274 ngx_resolver_ctx_t *ctx; | |
| 275 | |
| 276 if (temp) { | |
| 277 addr = ngx_inet_addr(temp->name.data, temp->name.len); | |
| 278 | |
| 279 if (addr != INADDR_NONE) { | |
| 280 temp->resolver = r; | |
| 281 temp->state = NGX_OK; | |
| 282 temp->naddrs = 1; | |
| 283 temp->addrs = &temp->addr; | |
| 284 temp->addr = addr; | |
| 285 temp->quick = 1; | |
| 286 | |
| 287 return temp; | |
| 288 } | |
| 289 } | |
| 290 | |
|
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291 if (r->udp_connections.nelts == 0) { |
|
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292 return NGX_NO_RESOLVER; |
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293 } |
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294 |
| 1649 | 295 ctx = ngx_resolver_calloc(r, sizeof(ngx_resolver_ctx_t)); |
| 296 | |
| 297 if (ctx) { | |
| 298 ctx->resolver = r; | |
| 299 } | |
| 300 | |
| 301 return ctx; | |
| 302 } | |
| 303 | |
| 304 | |
| 305 ngx_int_t | |
| 306 ngx_resolve_name(ngx_resolver_ctx_t *ctx) | |
| 307 { | |
| 308 ngx_int_t rc; | |
| 309 ngx_resolver_t *r; | |
| 310 | |
| 311 r = ctx->resolver; | |
| 312 | |
| 313 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 314 "resolve: \"%V\"", &ctx->name); | |
| 315 | |
| 316 if (ctx->quick) { | |
| 317 ctx->handler(ctx); | |
| 318 return NGX_OK; | |
| 319 } | |
| 320 | |
| 321 /* lock name mutex */ | |
| 322 | |
| 323 rc = ngx_resolve_name_locked(r, ctx); | |
| 324 | |
| 325 if (rc == NGX_OK) { | |
| 326 return NGX_OK; | |
| 327 } | |
| 328 | |
| 329 /* unlock name mutex */ | |
| 330 | |
| 331 if (rc == NGX_AGAIN) { | |
| 332 return NGX_OK; | |
| 333 } | |
| 334 | |
|
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fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
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335 /* NGX_ERROR */ |
| 1649 | 336 |
| 337 if (ctx->event) { | |
|
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338 ngx_resolver_free(r, ctx->event); |
| 1649 | 339 } |
| 340 | |
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341 ngx_resolver_free(r, ctx); |
| 1649 | 342 |
| 343 return NGX_ERROR; | |
| 344 } | |
| 345 | |
| 346 | |
| 347 void | |
| 348 ngx_resolve_name_done(ngx_resolver_ctx_t *ctx) | |
| 349 { | |
| 350 uint32_t hash; | |
| 351 ngx_resolver_t *r; | |
| 352 ngx_resolver_ctx_t *w, **p; | |
| 353 ngx_resolver_node_t *rn; | |
| 354 | |
| 355 r = ctx->resolver; | |
| 356 | |
| 357 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 358 "resolve name done: %i", ctx->state); | |
| 359 | |
| 360 if (ctx->quick) { | |
| 361 return; | |
| 362 } | |
| 363 | |
| 364 if (ctx->event && ctx->event->timer_set) { | |
| 365 ngx_del_timer(ctx->event); | |
| 366 } | |
| 367 | |
| 368 /* lock name mutex */ | |
| 369 | |
| 370 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
| 371 | |
| 372 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
| 373 | |
| 374 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
| 375 | |
| 376 if (rn) { | |
| 377 p = &rn->waiting; | |
| 378 w = rn->waiting; | |
| 379 | |
| 380 while (w) { | |
| 381 if (w == ctx) { | |
| 382 *p = w->next; | |
| 383 | |
| 384 goto done; | |
| 385 } | |
| 386 | |
| 387 p = &w->next; | |
| 388 w = w->next; | |
| 389 } | |
| 390 } | |
| 391 | |
| 392 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
| 393 "could not cancel %V resolving", &ctx->name); | |
| 394 } | |
| 395 | |
| 396 done: | |
| 397 | |
| 398 ngx_resolver_expire(r, &r->name_rbtree, &r->name_expire_queue); | |
| 399 | |
| 400 /* unlock name mutex */ | |
| 401 | |
|
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|
402 /* lock alloc mutex */ |
|
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|
403 |
|
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|
404 if (ctx->event) { |
|
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|
405 ngx_resolver_free_locked(r, ctx->event); |
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406 } |
|
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diff
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|
407 |
|
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|
408 ngx_resolver_free_locked(r, ctx); |
|
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409 |
|
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diff
changeset
|
410 /* unlock alloc mutex */ |
| 1649 | 411 } |
| 412 | |
| 413 | |
| 414 /* NGX_RESOLVE_A only */ | |
| 415 | |
| 416 static ngx_int_t | |
| 417 ngx_resolve_name_locked(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx) | |
| 418 { | |
| 419 uint32_t hash; | |
| 420 in_addr_t addr, *addrs; | |
|
1961
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return NXDOMAIN for ".." in host name
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1960
diff
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|
421 ngx_int_t rc; |
| 1649 | 422 ngx_uint_t naddrs; |
| 423 ngx_resolver_ctx_t *next; | |
| 424 ngx_resolver_node_t *rn; | |
| 425 | |
| 426 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
| 427 | |
| 428 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
| 429 | |
| 430 if (rn) { | |
| 431 | |
| 432 if (rn->valid >= ngx_time()) { | |
| 433 | |
| 434 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
| 435 | |
| 436 ngx_queue_remove(&rn->queue); | |
| 437 | |
| 438 rn->expire = ngx_time() + r->expire; | |
| 439 | |
| 440 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 441 | |
| 442 naddrs = rn->naddrs; | |
| 443 | |
| 444 if (naddrs) { | |
| 445 | |
| 446 /* NGX_RESOLVE_A answer */ | |
| 447 | |
| 448 if (naddrs != 1) { | |
| 449 addr = 0; | |
|
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Maxim Dounin <mdounin@mdounin.ru>
parents:
4784
diff
changeset
|
450 addrs = ngx_resolver_rotate(r, rn->u.addrs, naddrs); |
| 1649 | 451 if (addrs == NULL) { |
| 452 return NGX_ERROR; | |
| 453 } | |
| 454 | |
| 455 } else { | |
| 456 addr = rn->u.addr; | |
| 457 addrs = NULL; | |
| 458 } | |
| 459 | |
| 460 ctx->next = rn->waiting; | |
| 461 rn->waiting = NULL; | |
| 462 | |
| 463 /* unlock name mutex */ | |
| 464 | |
| 465 do { | |
| 466 ctx->state = NGX_OK; | |
| 467 ctx->naddrs = naddrs; | |
| 468 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 469 ctx->addr = addr; | |
| 470 next = ctx->next; | |
| 471 | |
| 472 ctx->handler(ctx); | |
| 473 | |
| 474 ctx = next; | |
| 475 } while (ctx); | |
| 476 | |
| 477 if (addrs) { | |
| 478 ngx_resolver_free(r, addrs); | |
| 479 } | |
| 480 | |
| 481 return NGX_OK; | |
| 482 } | |
| 483 | |
| 484 /* NGX_RESOLVE_CNAME */ | |
| 485 | |
| 1969 | 486 if (ctx->recursion++ < NGX_RESOLVER_MAX_RECURSION) { |
| 487 | |
| 488 ctx->name.len = rn->cnlen; | |
| 489 ctx->name.data = rn->u.cname; | |
| 490 | |
| 491 return ngx_resolve_name_locked(r, ctx); | |
| 492 } | |
| 493 | |
| 494 ctx->next = rn->waiting; | |
| 495 rn->waiting = NULL; | |
| 496 | |
| 497 /* unlock name mutex */ | |
| 498 | |
| 499 do { | |
| 500 ctx->state = NGX_RESOLVE_NXDOMAIN; | |
| 501 next = ctx->next; | |
| 502 | |
| 503 ctx->handler(ctx); | |
| 504 | |
| 505 ctx = next; | |
| 506 } while (ctx); | |
| 507 | |
| 508 return NGX_OK; | |
| 1649 | 509 } |
| 510 | |
| 511 if (rn->waiting) { | |
| 512 | |
| 513 ctx->next = rn->waiting; | |
| 514 rn->waiting = ctx; | |
| 3297 | 515 ctx->state = NGX_AGAIN; |
| 1649 | 516 |
| 517 return NGX_AGAIN; | |
| 518 } | |
| 519 | |
| 520 ngx_queue_remove(&rn->queue); | |
| 521 | |
| 522 /* lock alloc mutex */ | |
| 523 | |
|
4619
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Resolver: protection from duplicate responses.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4610
diff
changeset
|
524 if (rn->query) { |
|
3171ec7d0d05
Resolver: protection from duplicate responses.
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parents:
4610
diff
changeset
|
525 ngx_resolver_free_locked(r, rn->query); |
|
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parents:
4610
diff
changeset
|
526 rn->query = NULL; |
|
3171ec7d0d05
Resolver: protection from duplicate responses.
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4610
diff
changeset
|
527 } |
| 1649 | 528 |
| 529 if (rn->cnlen) { | |
| 530 ngx_resolver_free_locked(r, rn->u.cname); | |
| 531 } | |
| 532 | |
| 533 if (rn->naddrs > 1) { | |
| 534 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 535 } | |
| 536 | |
| 537 /* unlock alloc mutex */ | |
| 538 | |
| 539 } else { | |
| 540 | |
| 541 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
| 542 if (rn == NULL) { | |
| 543 return NGX_ERROR; | |
| 544 } | |
| 545 | |
| 546 rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len); | |
| 547 if (rn->name == NULL) { | |
| 548 ngx_resolver_free(r, rn); | |
| 549 return NGX_ERROR; | |
| 550 } | |
| 551 | |
| 552 rn->node.key = hash; | |
| 553 rn->nlen = (u_short) ctx->name.len; | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
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parents:
1914
diff
changeset
|
554 rn->query = NULL; |
| 1649 | 555 |
| 556 ngx_rbtree_insert(&r->name_rbtree, &rn->node); | |
| 557 } | |
| 558 | |
|
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
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1960
diff
changeset
|
559 rc = ngx_resolver_create_name_query(rn, ctx); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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1960
diff
changeset
|
560 |
|
99b9feacccb4
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parents:
1960
diff
changeset
|
561 if (rc == NGX_ERROR) { |
| 1649 | 562 goto failed; |
| 563 } | |
| 564 | |
|
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
565 if (rc == NGX_DECLINED) { |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
566 ngx_rbtree_delete(&r->name_rbtree, &rn->node); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
567 |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
568 ngx_resolver_free(r, rn->query); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
569 ngx_resolver_free(r, rn->name); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
570 ngx_resolver_free(r, rn); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
571 |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
572 ctx->state = NGX_RESOLVE_NXDOMAIN; |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
573 ctx->handler(ctx); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
574 |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
575 return NGX_OK; |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
576 } |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
577 |
| 1649 | 578 if (ngx_resolver_send_query(r, rn) != NGX_OK) { |
| 579 goto failed; | |
| 580 } | |
| 581 | |
| 582 if (ctx->event == NULL) { | |
| 583 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
| 584 if (ctx->event == NULL) { | |
| 585 goto failed; | |
| 586 } | |
| 587 | |
| 588 ctx->event->handler = ngx_resolver_timeout_handler; | |
| 589 ctx->event->data = ctx; | |
| 590 ctx->event->log = r->log; | |
| 591 ctx->ident = -1; | |
| 592 | |
| 593 ngx_add_timer(ctx->event, ctx->timeout); | |
| 594 } | |
| 595 | |
| 596 if (ngx_queue_empty(&r->name_resend_queue)) { | |
| 597 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
| 598 } | |
| 599 | |
| 600 rn->expire = ngx_time() + r->resend_timeout; | |
| 601 | |
| 602 ngx_queue_insert_head(&r->name_resend_queue, &rn->queue); | |
| 603 | |
| 604 rn->cnlen = 0; | |
| 605 rn->naddrs = 0; | |
| 606 rn->valid = 0; | |
| 607 rn->waiting = ctx; | |
| 608 | |
| 609 ctx->state = NGX_AGAIN; | |
| 610 | |
| 611 return NGX_AGAIN; | |
| 612 | |
| 613 failed: | |
| 614 | |
| 615 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 616 | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
617 if (rn->query) { |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
618 ngx_resolver_free(r, rn->query); |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
619 } |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
620 |
| 1649 | 621 ngx_resolver_free(r, rn->name); |
| 622 | |
| 623 ngx_resolver_free(r, rn); | |
| 624 | |
| 625 return NGX_ERROR; | |
| 626 } | |
| 583 | 627 |
| 628 | |
| 629 ngx_int_t | |
| 1649 | 630 ngx_resolve_addr(ngx_resolver_ctx_t *ctx) |
| 631 { | |
|
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
632 u_char *name; |
| 1649 | 633 ngx_resolver_t *r; |
| 634 ngx_resolver_node_t *rn; | |
| 635 | |
| 636 r = ctx->resolver; | |
| 637 | |
| 638 ctx->addr = ntohl(ctx->addr); | |
| 639 | |
| 640 /* lock addr mutex */ | |
| 641 | |
| 642 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
| 643 | |
| 644 if (rn) { | |
| 645 | |
| 646 if (rn->valid >= ngx_time()) { | |
| 647 | |
| 648 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
| 649 | |
| 650 ngx_queue_remove(&rn->queue); | |
| 651 | |
| 652 rn->expire = ngx_time() + r->expire; | |
| 653 | |
| 654 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
| 655 | |
|
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
656 name = ngx_resolver_dup(r, rn->name, rn->nlen); |
|
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
657 if (name == NULL) { |
| 1649 | 658 goto failed; |
| 659 } | |
| 660 | |
|
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
661 ctx->name.len = rn->nlen; |
|
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
662 ctx->name.data = name; |
|
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
663 |
| 1649 | 664 /* unlock addr mutex */ |
| 665 | |
| 666 ctx->state = NGX_OK; | |
| 667 | |
| 668 ctx->handler(ctx); | |
| 669 | |
|
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
670 ngx_resolver_free(r, name); |
| 1649 | 671 |
| 672 return NGX_OK; | |
| 673 } | |
| 674 | |
| 675 if (rn->waiting) { | |
| 676 | |
| 677 ctx->next = rn->waiting; | |
| 678 rn->waiting = ctx; | |
| 3297 | 679 ctx->state = NGX_AGAIN; |
| 1649 | 680 |
|
2487
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
681 /* unlock addr mutex */ |
|
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
682 |
|
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
683 return NGX_OK; |
| 1649 | 684 } |
| 685 | |
| 686 ngx_queue_remove(&rn->queue); | |
| 687 | |
| 688 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
|
689 rn->query = NULL; |
| 1649 | 690 |
| 691 } else { | |
| 692 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
| 693 if (rn == NULL) { | |
| 694 goto failed; | |
| 695 } | |
| 696 | |
| 697 rn->node.key = ctx->addr; | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
698 rn->query = NULL; |
| 1649 | 699 |
| 700 ngx_rbtree_insert(&r->addr_rbtree, &rn->node); | |
| 701 } | |
| 702 | |
| 703 if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) { | |
| 704 goto failed; | |
| 705 } | |
| 706 | |
| 707 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
| 708 goto failed; | |
| 709 } | |
| 710 | |
| 711 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
| 712 if (ctx->event == NULL) { | |
| 713 goto failed; | |
| 714 } | |
| 715 | |
| 716 ctx->event->handler = ngx_resolver_timeout_handler; | |
| 717 ctx->event->data = ctx; | |
| 718 ctx->event->log = r->log; | |
| 719 ctx->ident = -1; | |
| 720 | |
| 721 ngx_add_timer(ctx->event, ctx->timeout); | |
| 722 | |
| 723 if (ngx_queue_empty(&r->addr_resend_queue)) { | |
| 724 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
| 725 } | |
| 726 | |
| 727 rn->expire = ngx_time() + r->resend_timeout; | |
| 728 | |
| 729 ngx_queue_insert_head(&r->addr_resend_queue, &rn->queue); | |
| 730 | |
| 731 rn->cnlen = 0; | |
| 732 rn->naddrs = 0; | |
| 733 rn->name = NULL; | |
| 734 rn->nlen = 0; | |
| 735 rn->valid = 0; | |
| 736 rn->waiting = ctx; | |
| 737 | |
| 738 /* unlock addr mutex */ | |
| 739 | |
| 740 ctx->state = NGX_AGAIN; | |
| 741 | |
| 742 return NGX_OK; | |
| 743 | |
| 744 failed: | |
| 745 | |
| 746 if (rn) { | |
| 747 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 748 | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
749 if (rn->query) { |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
750 ngx_resolver_free(r, rn->query); |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
751 } |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
752 |
| 1649 | 753 ngx_resolver_free(r, rn); |
| 754 } | |
| 755 | |
| 756 /* unlock addr mutex */ | |
| 757 | |
| 758 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
|
759 ngx_resolver_free(r, ctx->event); |
| 1649 | 760 } |
| 761 | |
|
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
762 ngx_resolver_free(r, ctx); |
| 1649 | 763 |
| 764 return NGX_ERROR; | |
| 765 } | |
| 766 | |
| 767 | |
| 768 void | |
| 769 ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx) | |
| 770 { | |
| 771 in_addr_t addr; | |
| 772 ngx_resolver_t *r; | |
| 773 ngx_resolver_ctx_t *w, **p; | |
| 774 ngx_resolver_node_t *rn; | |
| 775 | |
| 776 r = ctx->resolver; | |
| 777 | |
| 778 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 779 "resolve addr done: %i", ctx->state); | |
| 780 | |
| 781 if (ctx->event && ctx->event->timer_set) { | |
| 782 ngx_del_timer(ctx->event); | |
| 783 } | |
| 784 | |
| 785 /* lock addr mutex */ | |
| 786 | |
| 787 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
| 788 | |
| 789 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
| 790 | |
| 791 if (rn) { | |
| 792 p = &rn->waiting; | |
| 793 w = rn->waiting; | |
| 794 | |
| 795 while (w) { | |
| 796 if (w == ctx) { | |
| 797 *p = w->next; | |
| 798 | |
| 799 goto done; | |
| 800 } | |
| 801 | |
| 802 p = &w->next; | |
| 803 w = w->next; | |
| 804 } | |
| 805 } | |
| 806 | |
| 807 addr = ntohl(ctx->addr); | |
| 808 | |
| 809 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
| 810 "could not cancel %ud.%ud.%ud.%ud resolving", | |
| 811 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 812 (addr >> 8) & 0xff, addr & 0xff); | |
| 813 } | |
| 814 | |
| 815 done: | |
| 816 | |
| 817 ngx_resolver_expire(r, &r->addr_rbtree, &r->addr_expire_queue); | |
| 818 | |
| 819 /* unlock addr mutex */ | |
| 820 | |
|
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
821 /* 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
|
822 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
823 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
|
824 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
|
825 } |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
826 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
827 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
|
828 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
829 /* unlock alloc mutex */ |
| 1649 | 830 } |
| 831 | |
| 832 | |
| 833 static void | |
| 834 ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 835 { | |
| 836 time_t now; | |
| 837 ngx_uint_t i; | |
| 838 ngx_queue_t *q; | |
| 839 ngx_resolver_node_t *rn; | |
| 840 | |
| 841 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire"); | |
| 842 | |
| 843 now = ngx_time(); | |
| 844 | |
| 845 for (i = 0; i < 2; i++) { | |
| 846 if (ngx_queue_empty(queue)) { | |
| 847 return; | |
| 848 } | |
| 849 | |
| 850 q = ngx_queue_last(queue); | |
| 851 | |
| 852 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 853 | |
| 854 if (now <= rn->expire) { | |
| 855 return; | |
| 856 } | |
| 857 | |
| 1774 | 858 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, |
| 859 "resolver expire \"%*s\"", (size_t) rn->nlen, rn->name); | |
| 1649 | 860 |
| 861 ngx_queue_remove(q); | |
| 862 | |
| 863 ngx_rbtree_delete(tree, &rn->node); | |
| 864 | |
| 865 ngx_resolver_free_node(r, rn); | |
| 866 } | |
| 867 } | |
| 868 | |
| 869 | |
| 870 static ngx_int_t | |
| 871 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 872 { | |
| 873 ssize_t n; | |
| 874 ngx_udp_connection_t *uc; | |
| 875 | |
|
4225
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
876 uc = r->udp_connections.elts; |
|
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
877 |
|
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
878 uc = &uc[r->last_connection++]; |
|
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
879 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
|
880 r->last_connection = 0; |
|
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
881 } |
| 1649 | 882 |
| 883 if (uc->connection == NULL) { | |
|
4496
be6c250b827b
Fixed null pointer dereference in resolver (ticket #91).
Maxim Dounin <mdounin@mdounin.ru>
parents:
4474
diff
changeset
|
884 |
|
be6c250b827b
Fixed null pointer dereference in resolver (ticket #91).
Maxim Dounin <mdounin@mdounin.ru>
parents:
4474
diff
changeset
|
885 uc->log = *r->log; |
|
be6c250b827b
Fixed null pointer dereference in resolver (ticket #91).
Maxim Dounin <mdounin@mdounin.ru>
parents:
4474
diff
changeset
|
886 uc->log.handler = ngx_resolver_log_error; |
|
be6c250b827b
Fixed null pointer dereference in resolver (ticket #91).
Maxim Dounin <mdounin@mdounin.ru>
parents:
4474
diff
changeset
|
887 uc->log.data = uc; |
|
be6c250b827b
Fixed null pointer dereference in resolver (ticket #91).
Maxim Dounin <mdounin@mdounin.ru>
parents:
4474
diff
changeset
|
888 uc->log.action = "resolving"; |
|
be6c250b827b
Fixed null pointer dereference in resolver (ticket #91).
Maxim Dounin <mdounin@mdounin.ru>
parents:
4474
diff
changeset
|
889 |
| 1649 | 890 if (ngx_udp_connect(uc) != NGX_OK) { |
| 891 return NGX_ERROR; | |
| 892 } | |
| 893 | |
| 894 uc->connection->data = r; | |
| 895 uc->connection->read->handler = ngx_resolver_read_response; | |
| 1906 | 896 uc->connection->read->resolver = 1; |
| 1649 | 897 } |
| 898 | |
| 899 n = ngx_send(uc->connection, rn->query, rn->qlen); | |
| 900 | |
| 901 if (n == -1) { | |
| 902 return NGX_ERROR; | |
| 903 } | |
| 904 | |
| 905 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
|
906 ngx_log_error(NGX_LOG_CRIT, &uc->log, 0, "send() incomplete"); |
| 1649 | 907 return NGX_ERROR; |
| 908 } | |
| 909 | |
| 910 return NGX_OK; | |
| 911 } | |
| 912 | |
| 913 | |
| 914 static void | |
| 915 ngx_resolver_resend_handler(ngx_event_t *ev) | |
| 916 { | |
| 917 time_t timer, atimer, ntimer; | |
| 918 ngx_resolver_t *r; | |
| 919 | |
| 920 r = ev->data; | |
| 921 | |
| 922 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 923 "resolver resend handler"); | |
| 924 | |
| 925 /* lock name mutex */ | |
| 926 | |
| 927 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue); | |
| 928 | |
| 929 /* unlock name mutex */ | |
| 930 | |
| 931 /* lock addr mutex */ | |
| 932 | |
| 933 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
|
934 |
| 1649 | 935 /* unlock addr mutex */ |
| 936 | |
| 937 if (ntimer == 0) { | |
| 938 timer = atimer; | |
| 939 | |
| 940 } else if (atimer == 0) { | |
| 941 timer = ntimer; | |
| 942 | |
| 943 } else { | |
| 944 timer = (atimer < ntimer) ? atimer : ntimer; | |
| 945 } | |
| 946 | |
| 947 if (timer) { | |
| 948 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000)); | |
| 949 } | |
| 950 } | |
| 951 | |
| 952 | |
| 953 static time_t | |
| 954 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 955 { | |
| 956 time_t now; | |
| 957 ngx_queue_t *q; | |
| 958 ngx_resolver_node_t *rn; | |
| 959 | |
| 960 now = ngx_time(); | |
| 961 | |
| 962 for ( ;; ) { | |
| 963 if (ngx_queue_empty(queue)) { | |
| 964 return 0; | |
| 965 } | |
| 966 | |
| 967 q = ngx_queue_last(queue); | |
| 968 | |
| 969 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 970 | |
| 971 if (now < rn->expire) { | |
| 972 return rn->expire - now; | |
| 973 } | |
| 974 | |
| 1774 | 975 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, |
| 976 "resolver resend \"%*s\" %p", | |
| 977 (size_t) rn->nlen, rn->name, rn->waiting); | |
| 1649 | 978 |
| 979 ngx_queue_remove(q); | |
| 980 | |
| 981 if (rn->waiting) { | |
| 982 | |
|
4683
84d8e60b65f0
Fixed crash in ngx_resolver_cleanup_tree().
Ruslan Ermilov <ru@nginx.com>
parents:
4671
diff
changeset
|
983 (void) ngx_resolver_send_query(r, rn); |
|
84d8e60b65f0
Fixed crash in ngx_resolver_cleanup_tree().
Ruslan Ermilov <ru@nginx.com>
parents:
4671
diff
changeset
|
984 |
|
84d8e60b65f0
Fixed crash in ngx_resolver_cleanup_tree().
Ruslan Ermilov <ru@nginx.com>
parents:
4671
diff
changeset
|
985 rn->expire = now + r->resend_timeout; |
|
84d8e60b65f0
Fixed crash in ngx_resolver_cleanup_tree().
Ruslan Ermilov <ru@nginx.com>
parents:
4671
diff
changeset
|
986 |
|
84d8e60b65f0
Fixed crash in ngx_resolver_cleanup_tree().
Ruslan Ermilov <ru@nginx.com>
parents:
4671
diff
changeset
|
987 ngx_queue_insert_head(queue, q); |
|
1879
cf4ee321d195
do not delete failed DNS request if there are waiting clients
Igor Sysoev <igor@sysoev.ru>
parents:
1878
diff
changeset
|
988 |
|
cf4ee321d195
do not delete failed DNS request if there are waiting clients
Igor Sysoev <igor@sysoev.ru>
parents:
1878
diff
changeset
|
989 continue; |
| 1649 | 990 } |
| 991 | |
| 992 ngx_rbtree_delete(tree, &rn->node); | |
| 993 | |
| 994 ngx_resolver_free_node(r, rn); | |
| 995 } | |
| 996 } | |
| 997 | |
| 998 | |
| 999 static void | |
| 1000 ngx_resolver_read_response(ngx_event_t *rev) | |
| 1001 { | |
| 1002 ssize_t n; | |
| 1003 ngx_connection_t *c; | |
| 1004 u_char buf[NGX_RESOLVER_UDP_SIZE]; | |
| 1005 | |
| 1006 c = rev->data; | |
| 1007 | |
| 1008 do { | |
| 1689 | 1009 n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE); |
| 1010 | |
| 1011 if (n < 0) { | |
| 1649 | 1012 return; |
| 1013 } | |
| 1014 | |
| 1015 ngx_resolver_process_response(c->data, buf, n); | |
| 1016 | |
| 1017 } while (rev->ready); | |
| 1018 } | |
| 1019 | |
| 1020 | |
| 1021 static void | |
| 1022 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n) | |
| 1023 { | |
| 1024 char *err; | |
| 1025 size_t len; | |
|
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diff
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|
1026 ngx_uint_t i, times, ident, qident, flags, code, nqs, nan, |
|
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diff
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|
1027 qtype, qclass; |
|
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2281
diff
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|
1028 ngx_queue_t *q; |
| 1649 | 1029 ngx_resolver_qs_t *qs; |
|
2282
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diff
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|
1030 ngx_resolver_node_t *rn; |
| 1649 | 1031 ngx_resolver_query_t *query; |
| 1032 | |
|
2281
5004229420a6
FORMERR DNS response may be equal to mininal query size
Igor Sysoev <igor@sysoev.ru>
parents:
2006
diff
changeset
|
1033 if ((size_t) n < sizeof(ngx_resolver_query_t)) { |
| 1649 | 1034 goto short_response; |
| 1035 } | |
| 1036 | |
| 1037 query = (ngx_resolver_query_t *) buf; | |
| 1038 | |
| 1039 ident = (query->ident_hi << 8) + query->ident_lo; | |
| 1040 flags = (query->flags_hi << 8) + query->flags_lo; | |
| 1041 nqs = (query->nqs_hi << 8) + query->nqs_lo; | |
| 1042 nan = (query->nan_hi << 8) + query->nan_lo; | |
| 1043 | |
| 1044 ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0, | |
|
4653
134ccdf44647
Resolver: fixed format specification.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4643
diff
changeset
|
1045 "resolver DNS response %ui fl:%04Xui %ui/%ui/%ud/%ud", |
| 1649 | 1046 ident, flags, nqs, nan, |
| 1047 (query->nns_hi << 8) + query->nns_lo, | |
| 1048 (query->nar_hi << 8) + query->nar_lo); | |
| 1049 | |
| 1050 if (!(flags & 0x8000)) { | |
| 1051 ngx_log_error(r->log_level, r->log, 0, | |
|
1967
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use correct ngx_sprintf() formats
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1966
diff
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|
1052 "invalid DNS response %ui fl:%04Xui", ident, flags); |
| 1649 | 1053 return; |
| 1054 } | |
| 1055 | |
| 1056 code = flags & 0x7f; | |
| 1057 | |
|
2282
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2281
diff
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|
1058 if (code == NGX_RESOLVE_FORMERR) { |
|
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diff
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|
1059 |
|
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|
1060 times = 0; |
|
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|
1061 |
|
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|
1062 for (q = ngx_queue_head(&r->name_resend_queue); |
|
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diff
changeset
|
1063 q != ngx_queue_sentinel(&r->name_resend_queue) || times++ < 100; |
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|
1064 q = ngx_queue_next(q)) |
|
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show name for a FORMERR DNS response
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|
1065 { |
|
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diff
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|
1066 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); |
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diff
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|
1067 qident = (rn->query[0] << 8) + rn->query[1]; |
|
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|
1068 |
|
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diff
changeset
|
1069 if (qident == ident) { |
|
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2281
diff
changeset
|
1070 ngx_log_error(r->log_level, r->log, 0, |
|
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2281
diff
changeset
|
1071 "DNS error (%ui: %s), query id:%ui, name:\"%*s\"", |
|
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diff
changeset
|
1072 code, ngx_resolver_strerror(code), ident, |
|
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2281
diff
changeset
|
1073 rn->nlen, rn->name); |
|
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Igor Sysoev <igor@sysoev.ru>
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diff
changeset
|
1074 return; |
|
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show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
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|
1075 } |
|
ec97eb9a8038
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Igor Sysoev <igor@sysoev.ru>
parents:
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diff
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|
1076 } |
|
ec97eb9a8038
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changeset
|
1077 |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
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diff
changeset
|
1078 goto dns_error; |
|
ec97eb9a8038
show name for a FORMERR DNS response
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diff
changeset
|
1079 } |
|
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diff
changeset
|
1080 |
|
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diff
changeset
|
1081 if (code > NGX_RESOLVE_REFUSED) { |
|
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2281
diff
changeset
|
1082 goto dns_error; |
| 1649 | 1083 } |
| 1084 | |
| 1085 if (nqs != 1) { | |
| 1086 err = "invalid number of questions in DNS response"; | |
| 1087 goto done; | |
| 1088 } | |
| 1089 | |
| 1090 i = sizeof(ngx_resolver_query_t); | |
| 1091 | |
| 1092 while (i < (ngx_uint_t) n) { | |
| 1093 if (buf[i] == '\0') { | |
| 1094 goto found; | |
| 1095 } | |
| 1096 | |
| 1097 len = buf[i]; | |
| 1098 i += 1 + len; | |
| 1099 } | |
| 1100 | |
| 1101 goto short_response; | |
| 1102 | |
| 1103 found: | |
| 1104 | |
| 1105 if (i++ == 0) { | |
| 1106 err = "zero-length domain name in DNS response"; | |
| 1107 goto done; | |
| 1108 } | |
| 1109 | |
| 1110 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t)) | |
| 1111 > (ngx_uint_t) n) | |
| 1112 { | |
| 1113 goto short_response; | |
| 1114 } | |
| 1115 | |
| 1116 qs = (ngx_resolver_qs_t *) &buf[i]; | |
| 1117 | |
| 1118 qtype = (qs->type_hi << 8) + qs->type_lo; | |
| 1119 qclass = (qs->class_hi << 8) + qs->class_lo; | |
| 1120 | |
| 1121 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
|
1967
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use correct ngx_sprintf() formats
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1966
diff
changeset
|
1122 "resolver DNS response qt:%ui cl:%ui", qtype, qclass); |
| 1649 | 1123 |
| 1124 if (qclass != 1) { | |
| 1125 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
|
1126 "unknown query class %ui in DNS response", qclass); |
| 1649 | 1127 return; |
| 1128 } | |
| 1129 | |
| 1130 switch (qtype) { | |
| 1131 | |
| 1132 case NGX_RESOLVE_A: | |
| 1133 | |
| 1134 ngx_resolver_process_a(r, buf, n, ident, code, nan, | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1135 i + sizeof(ngx_resolver_qs_t)); |
| 1649 | 1136 |
| 1137 break; | |
| 1138 | |
| 1139 case NGX_RESOLVE_PTR: | |
| 1140 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1141 ngx_resolver_process_ptr(r, buf, n, ident, code, nan); |
| 1649 | 1142 |
| 1143 break; | |
| 1144 | |
| 1145 default: | |
| 1146 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
|
1147 "unknown query type %ui in DNS response", qtype); |
| 1649 | 1148 return; |
| 1149 } | |
| 1150 | |
| 1151 return; | |
| 1152 | |
| 1153 short_response: | |
| 1154 | |
| 1155 err = "short dns response"; | |
| 1156 | |
| 1157 done: | |
| 1158 | |
| 1159 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1160 | |
| 1161 return; | |
|
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diff
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|
1162 |
|
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2281
diff
changeset
|
1163 dns_error: |
|
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diff
changeset
|
1164 |
|
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Igor Sysoev <igor@sysoev.ru>
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|
1165 ngx_log_error(r->log_level, r->log, 0, |
|
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show name for a FORMERR DNS response
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diff
changeset
|
1166 "DNS error (%ui: %s), query id:%ui", |
|
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show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
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2281
diff
changeset
|
1167 code, ngx_resolver_strerror(code), ident); |
|
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show name for a FORMERR DNS response
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parents:
2281
diff
changeset
|
1168 return; |
| 1649 | 1169 } |
| 1170 | |
| 1171 | |
| 1172 static void | |
| 1173 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last, | |
| 1174 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans) | |
| 583 | 1175 { |
| 1649 | 1176 char *err; |
| 1177 u_char *cname; | |
| 1178 size_t len; | |
|
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1179 int32_t ttl; |
| 1649 | 1180 uint32_t hash; |
| 1181 in_addr_t addr, *addrs; | |
| 1182 ngx_str_t name; | |
| 1183 ngx_uint_t qtype, qident, naddrs, a, i, n, start; | |
| 1184 ngx_resolver_an_t *an; | |
| 1185 ngx_resolver_ctx_t *ctx, *next; | |
| 1186 ngx_resolver_node_t *rn; | |
| 1187 | |
| 1188 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) { | |
| 1189 return; | |
| 1190 } | |
| 1191 | |
| 1192 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); | |
| 1193 | |
| 1194 hash = ngx_crc32_short(name.data, name.len); | |
| 1195 | |
| 1196 /* lock name mutex */ | |
| 1197 | |
| 1198 rn = ngx_resolver_lookup_name(r, &name, hash); | |
| 1199 | |
| 1200 if (rn == NULL || rn->query == NULL) { | |
| 1201 ngx_log_error(r->log_level, r->log, 0, | |
| 1202 "unexpected response for %V", &name); | |
| 1203 goto failed; | |
| 1204 } | |
| 1205 | |
| 1206 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 1207 | |
| 1208 if (ident != qident) { | |
| 1209 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
|
1210 "wrong ident %ui response for %V, expect %ui", |
| 1649 | 1211 ident, &name, qident); |
| 1212 goto failed; | |
| 1213 } | |
| 1214 | |
| 3139 | 1215 ngx_resolver_free(r, name.data); |
| 1216 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1217 if (code == 0 && nan == 0) { |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1218 code = 3; /* NXDOMAIN */ |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
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parents:
1741
diff
changeset
|
1219 } |
|
268b81386fe4
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parents:
1741
diff
changeset
|
1220 |
| 1649 | 1221 if (code) { |
| 1222 next = rn->waiting; | |
| 1223 rn->waiting = NULL; | |
| 1224 | |
| 1225 ngx_queue_remove(&rn->queue); | |
| 1226 | |
| 1227 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 1228 | |
| 1229 ngx_resolver_free_node(r, rn); | |
| 1230 | |
| 1231 /* unlock name mutex */ | |
| 1232 | |
| 1233 while (next) { | |
| 1234 ctx = next; | |
| 1235 ctx->state = code; | |
| 1236 next = ctx->next; | |
| 1237 | |
| 1238 ctx->handler(ctx); | |
| 1239 } | |
| 1240 | |
| 1241 return; | |
| 1242 } | |
| 1243 | |
| 1244 i = ans; | |
| 1245 naddrs = 0; | |
| 1246 addr = 0; | |
| 1247 addrs = NULL; | |
| 1248 cname = NULL; | |
| 1249 qtype = 0; | |
|
4296
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Silenced a warning for some compilers.
Ruslan Ermilov <ru@nginx.com>
parents:
4295
diff
changeset
|
1250 ttl = 0; |
| 1649 | 1251 |
| 1252 for (a = 0; a < nan; a++) { | |
| 1253 | |
| 1254 start = i; | |
| 1255 | |
| 1256 while (i < last) { | |
| 1257 | |
| 1258 if (buf[i] & 0xc0) { | |
| 1259 i += 2; | |
| 1260 goto found; | |
| 1261 } | |
| 1262 | |
| 1263 if (buf[i] == 0) { | |
| 1264 i++; | |
| 1265 goto test_length; | |
| 1266 } | |
| 1267 | |
| 1268 i += 1 + buf[i]; | |
| 1269 } | |
| 1270 | |
| 1271 goto short_response; | |
| 1272 | |
| 1273 test_length: | |
| 1274 | |
| 1275 if (i - start < 2) { | |
| 1276 err = "invalid name in dns response"; | |
| 1277 goto invalid; | |
| 1278 } | |
| 1279 | |
| 1280 found: | |
| 1281 | |
| 1282 if (i + sizeof(ngx_resolver_an_t) >= last) { | |
| 1283 goto short_response; | |
| 1284 } | |
| 1285 | |
| 1286 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1287 | |
| 1288 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1289 len = (an->len_hi << 8) + an->len_lo; | |
|
4295
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Now nginx uses TTL of a DNS response when calculating cache validity.
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parents:
4267
diff
changeset
|
1290 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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parents:
4267
diff
changeset
|
1291 + (an->ttl[2] << 8) + (an->ttl[3]); |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1292 |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1293 if (ttl < 0) { |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
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parents:
4267
diff
changeset
|
1294 ttl = 0; |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1295 } |
| 1649 | 1296 |
| 1297 if (qtype == NGX_RESOLVE_A) { | |
| 1298 | |
| 1299 i += sizeof(ngx_resolver_an_t); | |
| 1300 | |
| 1301 if (i + len > last) { | |
| 1302 goto short_response; | |
| 1303 } | |
| 1304 | |
| 1305 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1306 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1307 | |
| 1308 naddrs++; | |
| 1309 | |
| 1310 i += len; | |
| 1311 | |
| 1312 } else if (qtype == NGX_RESOLVE_CNAME) { | |
| 1313 cname = &buf[i] + sizeof(ngx_resolver_an_t); | |
| 1314 i += sizeof(ngx_resolver_an_t) + len; | |
| 1965 | 1315 |
| 1316 } else if (qtype == NGX_RESOLVE_DNAME) { | |
| 1317 i += sizeof(ngx_resolver_an_t) + len; | |
| 1966 | 1318 |
| 1319 } else { | |
| 1320 ngx_log_error(r->log_level, r->log, 0, | |
| 1321 "unexpected qtype %ui", qtype); | |
| 1649 | 1322 } |
| 1323 } | |
| 1324 | |
|
4295
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Now nginx uses TTL of a DNS response when calculating cache validity.
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diff
changeset
|
1325 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
|
1326 "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
|
1327 naddrs, cname, ttl); |
| 1649 | 1328 |
| 1329 if (naddrs) { | |
| 1330 | |
| 1331 if (naddrs == 1) { | |
| 1332 rn->u.addr = addr; | |
| 1333 | |
| 1334 } else { | |
| 1335 | |
| 1336 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t)); | |
| 1337 if (addrs == NULL) { | |
| 1338 return; | |
| 1339 } | |
| 1340 | |
| 1341 n = 0; | |
| 1342 i = ans; | |
| 1343 | |
| 1344 for (a = 0; a < nan; a++) { | |
| 1345 | |
| 1346 for ( ;; ) { | |
| 1347 | |
| 1348 if (buf[i] & 0xc0) { | |
| 1349 i += 2; | |
| 1350 goto ok; | |
| 1351 } | |
| 1352 | |
| 1353 if (buf[i] == 0) { | |
| 1354 i++; | |
| 1355 goto ok; | |
| 1356 } | |
| 1357 | |
| 1358 i += 1 + buf[i]; | |
| 1359 } | |
| 1360 | |
| 1361 ok: | |
| 1362 | |
| 1363 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1364 | |
| 1365 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1366 len = (an->len_hi << 8) + an->len_lo; | |
| 1367 | |
| 1368 i += sizeof(ngx_resolver_an_t); | |
| 1369 | |
| 1370 if (qtype == NGX_RESOLVE_A) { | |
| 1371 | |
| 1372 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1373 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1374 | |
| 1375 if (n == naddrs) { | |
| 1376 break; | |
| 1377 } | |
| 1378 } | |
| 1379 | |
| 1380 i += len; | |
| 1381 } | |
| 1382 | |
| 1383 rn->u.addrs = addrs; | |
| 1384 | |
| 1385 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
| 1386 naddrs * sizeof(in_addr_t)); | |
| 1387 if (addrs == NULL) { | |
| 1388 return; | |
| 1389 } | |
| 1390 } | |
| 1391 | |
| 1392 rn->naddrs = (u_short) naddrs; | |
| 1393 | |
| 1394 ngx_queue_remove(&rn->queue); | |
| 1395 | |
|
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1396 rn->valid = ngx_time() + (r->valid ? r->valid : ttl); |
| 1649 | 1397 rn->expire = ngx_time() + r->expire; |
| 1398 | |
| 1399 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1400 | |
| 1401 next = rn->waiting; | |
| 1402 rn->waiting = NULL; | |
| 1403 | |
| 1404 /* unlock name mutex */ | |
| 1405 | |
| 1406 while (next) { | |
| 1407 ctx = next; | |
| 1408 ctx->state = NGX_OK; | |
| 1409 ctx->naddrs = naddrs; | |
| 1410 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 1411 ctx->addr = addr; | |
| 1412 next = ctx->next; | |
| 1413 | |
| 1414 ctx->handler(ctx); | |
| 1415 } | |
| 1416 | |
|
2483
29494780d978
free addrs only it has been allocated before: non single address
Igor Sysoev <igor@sysoev.ru>
parents:
2482
diff
changeset
|
1417 if (naddrs > 1) { |
| 1649 | 1418 ngx_resolver_free(r, addrs); |
| 1419 } | |
| 1420 | |
|
4619
3171ec7d0d05
Resolver: protection from duplicate responses.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4610
diff
changeset
|
1421 ngx_resolver_free(r, rn->query); |
|
3171ec7d0d05
Resolver: protection from duplicate responses.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4610
diff
changeset
|
1422 rn->query = NULL; |
|
3171ec7d0d05
Resolver: protection from duplicate responses.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4610
diff
changeset
|
1423 |
| 1649 | 1424 return; |
| 1425 | |
| 1426 } else if (cname) { | |
| 1427 | |
| 1428 /* CNAME only */ | |
| 1429 | |
| 1430 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) { | |
| 1431 return; | |
| 1432 } | |
| 1433 | |
| 1434 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1435 "resolver cname:\"%V\"", &name); | |
| 1436 | |
|
1741
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1437 ngx_queue_remove(&rn->queue); |
|
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1438 |
| 1649 | 1439 rn->cnlen = (u_short) name.len; |
| 1440 rn->u.cname = name.data; | |
|
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1441 |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1442 rn->valid = ngx_time() + (r->valid ? r->valid : ttl); |
| 1649 | 1443 rn->expire = ngx_time() + r->expire; |
| 1444 | |
| 1445 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1446 | |
| 1447 ctx = rn->waiting; | |
| 1448 rn->waiting = NULL; | |
| 1449 | |
| 1450 if (ctx) { | |
| 1451 ctx->name = name; | |
| 1452 | |
| 1453 (void) ngx_resolve_name_locked(r, ctx); | |
| 1454 } | |
| 1455 | |
|
4619
3171ec7d0d05
Resolver: protection from duplicate responses.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4610
diff
changeset
|
1456 ngx_resolver_free(r, rn->query); |
|
3171ec7d0d05
Resolver: protection from duplicate responses.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4610
diff
changeset
|
1457 rn->query = NULL; |
|
3171ec7d0d05
Resolver: protection from duplicate responses.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4610
diff
changeset
|
1458 |
| 1649 | 1459 return; |
| 1460 } | |
| 1461 | |
| 1462 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
|
1463 "no A or CNAME types in DNS responses, unknown query type: %ui", |
|
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1464 qtype); |
| 1649 | 1465 return; |
| 1466 | |
| 1467 short_response: | |
| 1468 | |
| 1469 err = "short dns response"; | |
| 1470 | |
| 1471 invalid: | |
| 1472 | |
| 1473 /* unlock name mutex */ | |
| 1474 | |
| 1475 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1476 | |
| 1477 return; | |
| 1478 | |
| 1479 failed: | |
| 1480 | |
| 1481 /* unlock name mutex */ | |
| 1482 | |
| 3139 | 1483 ngx_resolver_free(r, name.data); |
| 1484 | |
| 1649 | 1485 return; |
| 1486 } | |
| 1487 | |
| 1488 | |
| 1489 static void | |
| 1490 ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1491 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan) |
| 1649 | 1492 { |
| 1493 char *err; | |
| 1494 size_t len; | |
| 1495 in_addr_t addr; | |
|
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1496 int32_t ttl; |
| 1649 | 1497 ngx_int_t digit; |
| 1498 ngx_str_t name; | |
|
3902
159b58f9c0bd
fix building by gcc 4.6 without --with-debug
Igor Sysoev <igor@sysoev.ru>
parents:
3763
diff
changeset
|
1499 ngx_uint_t i, mask, qident; |
| 1649 | 1500 ngx_resolver_an_t *an; |
| 1501 ngx_resolver_ctx_t *ctx, *next; | |
| 1502 ngx_resolver_node_t *rn; | |
| 1503 | |
| 1504 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) { | |
| 1505 goto invalid_in_addr_arpa; | |
| 1506 } | |
| 1507 | |
| 1508 addr = 0; | |
| 1509 i = 12; | |
| 1510 | |
| 1511 for (mask = 0; mask < 32; mask += 8) { | |
| 1512 len = buf[i++]; | |
| 1513 | |
| 1514 digit = ngx_atoi(&buf[i], len); | |
| 1515 if (digit == NGX_ERROR || digit > 255) { | |
| 1516 goto invalid_in_addr_arpa; | |
| 1517 } | |
| 1518 | |
| 1519 addr += digit << mask; | |
| 1520 i += len; | |
| 1521 } | |
| 1522 | |
| 1523 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) { | |
| 1524 goto invalid_in_addr_arpa; | |
| 1525 } | |
| 1526 | |
| 1527 /* lock addr mutex */ | |
| 1528 | |
| 1529 rn = ngx_resolver_lookup_addr(r, addr); | |
| 1530 | |
| 1531 if (rn == NULL || rn->query == NULL) { | |
| 1532 ngx_log_error(r->log_level, r->log, 0, | |
| 1533 "unexpected response for %ud.%ud.%ud.%ud", | |
| 1534 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 1535 (addr >> 8) & 0xff, addr & 0xff); | |
| 1536 goto failed; | |
| 1537 } | |
| 1538 | |
| 1539 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 1540 | |
| 1541 if (ident != qident) { | |
| 1542 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
|
1543 "wrong ident %ui response for %ud.%ud.%ud.%ud, expect %ui", |
|
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1544 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff, |
|
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1545 (addr >> 8) & 0xff, addr & 0xff, qident); |
| 1649 | 1546 goto failed; |
| 1547 } | |
| 1548 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1549 if (code == 0 && nan == 0) { |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1550 code = 3; /* NXDOMAIN */ |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1551 } |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1552 |
| 1649 | 1553 if (code) { |
| 1554 next = rn->waiting; | |
| 1555 rn->waiting = NULL; | |
| 1556 | |
| 1557 ngx_queue_remove(&rn->queue); | |
| 1558 | |
| 1559 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 1560 | |
| 1561 ngx_resolver_free_node(r, rn); | |
| 1562 | |
| 1563 /* unlock addr mutex */ | |
| 1564 | |
| 1565 while (next) { | |
| 1566 ctx = next; | |
| 1567 ctx->state = code; | |
| 1568 next = ctx->next; | |
| 1569 | |
| 1570 ctx->handler(ctx); | |
| 1571 } | |
| 1572 | |
| 1573 return; | |
| 1574 } | |
| 1575 | |
| 1576 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t); | |
| 1577 | |
| 1578 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) { | |
| 1579 goto short_response; | |
| 1580 } | |
| 1581 | |
| 1582 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */ | |
| 1583 | |
| 1584 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) { | |
| 1585 err = "invalid in-addr.arpa name in DNS response"; | |
| 1586 goto invalid; | |
| 1587 } | |
| 1588 | |
| 1589 an = (ngx_resolver_an_t *) &buf[i + 2]; | |
| 1590 | |
| 1591 len = (an->len_hi << 8) + an->len_lo; | |
|
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1592 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
|
1593 + (an->ttl[2] << 8) + (an->ttl[3]); |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1594 |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1595 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
|
1596 ttl = 0; |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1597 } |
| 1649 | 1598 |
| 1599 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, | |
|
3902
159b58f9c0bd
fix building by gcc 4.6 without --with-debug
Igor Sysoev <igor@sysoev.ru>
parents:
3763
diff
changeset
|
1600 "resolver qt:%ui cl:%ui len:%uz", |
|
159b58f9c0bd
fix building by gcc 4.6 without --with-debug
Igor Sysoev <igor@sysoev.ru>
parents:
3763
diff
changeset
|
1601 (an->type_hi << 8) + an->type_lo, |
|
159b58f9c0bd
fix building by gcc 4.6 without --with-debug
Igor Sysoev <igor@sysoev.ru>
parents:
3763
diff
changeset
|
1602 (an->class_hi << 8) + an->class_lo, len); |
| 1649 | 1603 |
| 1604 i += 2 + sizeof(ngx_resolver_an_t); | |
| 1605 | |
| 1606 if (i + len > (ngx_uint_t) n) { | |
| 1607 goto short_response; | |
| 1608 } | |
| 1609 | |
| 1610 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) { | |
| 1611 return; | |
| 1612 } | |
| 1613 | |
| 1614 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name); | |
| 1615 | |
|
2486
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1616 if (name.len != (size_t) rn->nlen |
|
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1617 || ngx_strncmp(name.data, rn->name, name.len) != 0) |
| 1649 | 1618 { |
|
2482
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1619 if (rn->nlen) { |
|
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1620 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
|
1621 } |
|
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1622 |
|
2490
1c87647b7ca5
fix building by msvc, introduced in r2487
Igor Sysoev <igor@sysoev.ru>
parents:
2487
diff
changeset
|
1623 rn->nlen = (u_short) name.len; |
| 1649 | 1624 rn->name = name.data; |
| 1625 | |
|
2486
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1626 name.data = ngx_resolver_dup(r, rn->name, name.len); |
| 1649 | 1627 if (name.data == NULL) { |
| 1628 goto failed; | |
| 1629 } | |
| 1630 } | |
| 1631 | |
| 1632 ngx_queue_remove(&rn->queue); | |
| 1633 | |
|
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1634 rn->valid = ngx_time() + (r->valid ? r->valid : ttl); |
| 1649 | 1635 rn->expire = ngx_time() + r->expire; |
| 1636 | |
| 1637 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
| 1638 | |
| 1639 next = rn->waiting; | |
| 1640 rn->waiting = NULL; | |
| 1641 | |
| 1642 /* unlock addr mutex */ | |
| 1643 | |
| 1644 while (next) { | |
| 1645 ctx = next; | |
| 1646 ctx->state = NGX_OK; | |
| 1647 ctx->name = name; | |
| 1648 next = ctx->next; | |
| 1649 | |
| 1650 ctx->handler(ctx); | |
| 1651 } | |
| 1652 | |
| 1653 ngx_resolver_free(r, name.data); | |
| 1654 | |
| 1655 return; | |
| 1656 | |
| 1657 invalid_in_addr_arpa: | |
| 1658 | |
| 1659 ngx_log_error(r->log_level, r->log, 0, | |
| 1660 "invalid in-addr.arpa name in DNS response"); | |
| 1661 return; | |
| 1662 | |
| 1663 short_response: | |
| 1664 | |
| 1665 err = "short DNS response"; | |
| 1666 | |
| 1667 invalid: | |
| 1668 | |
| 1669 /* unlock addr mutex */ | |
| 1670 | |
| 1671 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1672 | |
| 1673 return; | |
| 1674 | |
| 1675 failed: | |
| 1676 | |
| 1677 /* unlock addr mutex */ | |
| 1678 | |
| 1679 return; | |
| 1680 } | |
| 1681 | |
| 1682 | |
| 1683 static ngx_resolver_node_t * | |
| 1684 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) | |
| 1685 { | |
| 1686 ngx_int_t rc; | |
| 1687 ngx_rbtree_node_t *node, *sentinel; | |
| 1688 ngx_resolver_node_t *rn; | |
| 1689 | |
| 1690 node = r->name_rbtree.root; | |
| 1691 sentinel = r->name_rbtree.sentinel; | |
| 1692 | |
| 1693 while (node != sentinel) { | |
| 1694 | |
| 1695 if (hash < node->key) { | |
| 1696 node = node->left; | |
| 1697 continue; | |
| 1698 } | |
| 1699 | |
| 1700 if (hash > node->key) { | |
| 1701 node = node->right; | |
| 1702 continue; | |
| 1703 } | |
| 1704 | |
| 1705 /* hash == node->key */ | |
| 1706 | |
|
4497
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1707 rn = (ngx_resolver_node_t *) node; |
|
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1708 |
|
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1709 rc = ngx_memn2cmp(name->data, rn->name, name->len, rn->nlen); |
|
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1710 |
|
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1711 if (rc == 0) { |
|
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1712 return rn; |
|
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1713 } |
|
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1714 |
|
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1715 node = (rc < 0) ? node->left : node->right; |
| 1649 | 1716 } |
| 1717 | |
| 1718 /* not found */ | |
| 1719 | |
| 1720 return NULL; | |
| 1721 } | |
| 1722 | |
| 1723 | |
| 1724 static ngx_resolver_node_t * | |
| 1725 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr) | |
| 1726 { | |
| 1727 ngx_rbtree_node_t *node, *sentinel; | |
| 1728 | |
| 1729 node = r->addr_rbtree.root; | |
| 1730 sentinel = r->addr_rbtree.sentinel; | |
| 1731 | |
| 1732 while (node != sentinel) { | |
| 1733 | |
| 1734 if (addr < node->key) { | |
| 1735 node = node->left; | |
| 1736 continue; | |
| 1737 } | |
| 1738 | |
| 1739 if (addr > node->key) { | |
| 1740 node = node->right; | |
| 1741 continue; | |
| 1742 } | |
| 1743 | |
| 1744 /* addr == node->key */ | |
| 1745 | |
| 1746 return (ngx_resolver_node_t *) node; | |
| 1747 } | |
| 1748 | |
| 1749 /* not found */ | |
| 1750 | |
| 1751 return NULL; | |
| 1752 } | |
| 1753 | |
| 1754 | |
| 1755 static void | |
| 1756 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
| 1757 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
| 1758 { | |
| 1759 ngx_rbtree_node_t **p; | |
| 1760 ngx_resolver_node_t *rn, *rn_temp; | |
| 1761 | |
| 1762 for ( ;; ) { | |
| 1763 | |
| 1764 if (node->key < temp->key) { | |
| 1765 | |
| 1766 p = &temp->left; | |
| 1767 | |
| 1768 } else if (node->key > temp->key) { | |
| 1769 | |
| 1770 p = &temp->right; | |
| 1771 | |
| 1772 } else { /* node->key == temp->key */ | |
| 1773 | |
| 1774 rn = (ngx_resolver_node_t *) node; | |
| 1775 rn_temp = (ngx_resolver_node_t *) temp; | |
| 1776 | |
|
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|
1777 p = (ngx_memn2cmp(rn->name, rn_temp->name, rn->nlen, rn_temp->nlen) |
|
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|
1778 < 0) ? &temp->left : &temp->right; |
| 1649 | 1779 } |
| 1780 | |
| 1781 if (*p == sentinel) { | |
| 1782 break; | |
| 1783 } | |
| 1784 | |
| 1785 temp = *p; | |
| 1786 } | |
| 1787 | |
| 1788 *p = node; | |
| 1789 node->parent = temp; | |
| 1790 node->left = sentinel; | |
| 1791 node->right = sentinel; | |
| 1792 ngx_rbt_red(node); | |
| 1793 } | |
| 1794 | |
| 1795 | |
| 1796 static ngx_int_t | |
| 1797 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1798 { | |
| 1799 u_char *p, *s; | |
|
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1800 size_t len, nlen; |
| 1649 | 1801 ngx_uint_t ident; |
| 1802 ngx_resolver_qs_t *qs; | |
| 1803 ngx_resolver_query_t *query; | |
| 1804 | |
|
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1805 nlen = ctx->name.len ? (1 + ctx->name.len + 1) : 1; |
|
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1806 |
|
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|
1807 len = sizeof(ngx_resolver_query_t) + nlen + sizeof(ngx_resolver_qs_t); |
| 1649 | 1808 |
|
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|
1809 p = ngx_resolver_alloc(ctx->resolver, len); |
| 1649 | 1810 if (p == NULL) { |
| 1811 return NGX_ERROR; | |
| 1812 } | |
| 1813 | |
| 1814 rn->qlen = (u_short) len; | |
| 1815 rn->query = p; | |
| 1816 | |
| 1817 query = (ngx_resolver_query_t *) p; | |
| 1818 | |
| 1819 ident = ngx_random(); | |
| 1820 | |
| 1821 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0, | |
| 1822 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff); | |
| 1823 | |
| 1824 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1825 query->ident_lo = (u_char) (ident & 0xff); | |
| 1826 | |
| 1827 /* recursion query */ | |
| 1828 query->flags_hi = 1; query->flags_lo = 0; | |
| 1829 | |
| 1830 /* one question */ | |
| 1831 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1832 query->nan_hi = 0; query->nan_lo = 0; | |
| 1833 query->nns_hi = 0; query->nns_lo = 0; | |
| 1834 query->nar_hi = 0; query->nar_lo = 0; | |
| 1835 | |
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1836 p += sizeof(ngx_resolver_query_t) + nlen; |
| 1649 | 1837 |
| 1838 qs = (ngx_resolver_qs_t *) p; | |
| 1839 | |
| 1840 /* query type */ | |
| 1841 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type; | |
| 1842 | |
| 1843 /* IP query class */ | |
| 1844 qs->class_hi = 0; qs->class_lo = 1; | |
| 1845 | |
| 1846 /* convert "www.example.com" to "\3www\7example\3com\0" */ | |
| 1847 | |
| 1848 len = 0; | |
| 1849 p--; | |
| 1850 *p-- = '\0'; | |
| 1851 | |
|
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|
1852 if (ctx->name.len == 0) { |
|
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Fixed segmentation fault in ngx_resolver_create_name_query().
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1853 return NGX_DECLINED; |
|
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Fixed segmentation fault in ngx_resolver_create_name_query().
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|
1854 } |
|
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Fixed segmentation fault in ngx_resolver_create_name_query().
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|
1855 |
| 1649 | 1856 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) { |
| 1857 if (*s != '.') { | |
| 1858 *p = *s; | |
| 1859 len++; | |
| 1860 | |
| 1861 } else { | |
|
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|
1862 if (len == 0 || len > 255) { |
|
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
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1863 return NGX_DECLINED; |
|
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return NXDOMAIN for ".." in host name
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1864 } |
|
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1865 |
| 1649 | 1866 *p = (u_char) len; |
| 1867 len = 0; | |
| 1868 } | |
| 1869 | |
| 1870 p--; | |
| 1871 } | |
| 1872 | |
|
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|
1873 if (len == 0 || len > 255) { |
|
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|
1874 return NGX_DECLINED; |
|
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1875 } |
|
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1876 |
| 1649 | 1877 *p = (u_char) len; |
| 1878 | |
| 1879 return NGX_OK; | |
| 1880 } | |
| 1881 | |
| 1882 | |
| 1883 /* AF_INET only */ | |
| 1884 | |
| 1885 static ngx_int_t | |
| 1886 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1887 { | |
| 1888 u_char *p, *d; | |
| 1889 size_t len; | |
| 1890 ngx_int_t n; | |
| 1891 ngx_uint_t ident; | |
| 1892 ngx_resolver_query_t *query; | |
| 1893 | |
| 1894 len = sizeof(ngx_resolver_query_t) | |
| 1895 + sizeof(".255.255.255.255.in-addr.arpa.") - 1 | |
| 1896 + sizeof(ngx_resolver_qs_t); | |
| 1897 | |
|
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1898 p = ngx_resolver_alloc(ctx->resolver, len); |
| 1649 | 1899 if (p == NULL) { |
| 1900 return NGX_ERROR; | |
| 1901 } | |
| 1902 | |
| 1903 rn->query = p; | |
| 1904 query = (ngx_resolver_query_t *) p; | |
| 1905 | |
| 1906 ident = ngx_random(); | |
| 1907 | |
| 1908 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1909 query->ident_lo = (u_char) (ident & 0xff); | |
| 1910 | |
| 1911 /* recursion query */ | |
| 1912 query->flags_hi = 1; query->flags_lo = 0; | |
| 1913 | |
| 1914 /* one question */ | |
| 1915 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1916 query->nan_hi = 0; query->nan_lo = 0; | |
| 1917 query->nns_hi = 0; query->nns_lo = 0; | |
| 1918 query->nar_hi = 0; query->nar_lo = 0; | |
| 1919 | |
| 1920 p += sizeof(ngx_resolver_query_t); | |
| 1921 | |
| 3642 | 1922 for (n = 0; n < 32; n += 8) { |
| 1649 | 1923 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff); |
| 1924 *p = (u_char) (d - &p[1]); | |
| 1925 p = d; | |
| 1926 } | |
| 1927 | |
| 1928 /* query type "PTR", IP query class */ | |
| 1929 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18); | |
| 1930 | |
| 1931 rn->qlen = (u_short) | |
| 1932 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t) | |
| 1933 - rn->query); | |
| 1934 | |
| 1935 return NGX_OK; | |
| 1936 } | |
| 1937 | |
| 1938 | |
| 1939 static ngx_int_t | |
| 1940 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src, | |
| 1941 u_char *last) | |
| 1942 { | |
| 1943 char *err; | |
| 1944 u_char *p, *dst; | |
| 1945 ssize_t len; | |
| 1946 ngx_uint_t i, n; | |
| 1947 | |
| 1948 p = src; | |
| 1949 len = -1; | |
| 1950 | |
| 1951 /* | |
| 1952 * compression pointers allow to create endless loop, so we set limit; | |
| 1953 * 128 pointers should be enough to store 255-byte name | |
| 1954 */ | |
| 1955 | |
| 1956 for (i = 0; i < 128; i++) { | |
| 1957 n = *p++; | |
| 1958 | |
| 1959 if (n == 0) { | |
| 1960 goto done; | |
| 1961 } | |
| 1962 | |
| 1963 if (n & 0xc0) { | |
|
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changeset
|
1964 n = ((n & 0x3f) << 8) + *p; |
| 1649 | 1965 p = &buf[n]; |
| 1966 | |
| 1967 } else { | |
| 1968 len += 1 + n; | |
| 1969 p = &p[n]; | |
| 1970 } | |
| 1971 | |
| 1972 if (p >= last) { | |
| 1973 err = "name is out of response"; | |
| 1974 goto invalid; | |
| 1975 } | |
| 1976 } | |
| 1977 | |
| 1978 err = "compression pointers loop"; | |
| 1979 | |
| 1980 invalid: | |
| 1981 | |
| 1982 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1983 | |
| 1984 return NGX_ERROR; | |
| 1985 | |
| 1986 done: | |
| 1987 | |
| 1988 if (name == NULL) { | |
| 583 | 1989 return NGX_OK; |
| 1990 } | |
| 1991 | |
|
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|
1992 if (len == -1) { |
|
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|
1993 name->len = 0; |
|
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|
1994 name->data = NULL; |
|
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|
1995 return NGX_OK; |
|
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|
1996 } |
|
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|
1997 |
| 1649 | 1998 dst = ngx_resolver_alloc(r, len); |
| 1999 if (dst == NULL) { | |
| 2000 return NGX_ERROR; | |
| 2001 } | |
| 2002 | |
| 2003 name->data = dst; | |
| 2004 | |
| 2005 n = *src++; | |
| 2006 | |
| 2007 for ( ;; ) { | |
|
4267
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Fixed compression pointer processing in DNS response greater than 255 bytes.
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parents:
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diff
changeset
|
2008 if (n & 0xc0) { |
|
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Fixed compression pointer processing in DNS response greater than 255 bytes.
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parents:
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diff
changeset
|
2009 n = ((n & 0x3f) << 8) + *src; |
|
768212ca0745
Fixed compression pointer processing in DNS response greater than 255 bytes.
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
2010 src = &buf[n]; |
|
768212ca0745
Fixed compression pointer processing in DNS response greater than 255 bytes.
Igor Sysoev <igor@sysoev.ru>
parents:
4225
diff
changeset
|
2011 |
|
768212ca0745
Fixed compression pointer processing in DNS response greater than 255 bytes.
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
2012 n = *src++; |
|
768212ca0745
Fixed compression pointer processing in DNS response greater than 255 bytes.
Igor Sysoev <igor@sysoev.ru>
parents:
4225
diff
changeset
|
2013 |
|
768212ca0745
Fixed compression pointer processing in DNS response greater than 255 bytes.
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
2014 } else { |
| 1649 | 2015 ngx_memcpy(dst, src, n); |
| 2016 dst += n; | |
| 2017 src += n; | |
| 2018 | |
| 2019 n = *src++; | |
| 2020 | |
| 2021 if (n != 0) { | |
| 2022 *dst++ = '.'; | |
| 2023 } | |
| 2024 } | |
| 2025 | |
| 2026 if (n == 0) { | |
| 2027 name->len = dst - name->data; | |
| 2028 return NGX_OK; | |
| 2029 } | |
| 2030 } | |
| 2031 } | |
| 2032 | |
| 2033 | |
| 2034 static void | |
| 2035 ngx_resolver_timeout_handler(ngx_event_t *ev) | |
| 2036 { | |
| 2037 ngx_resolver_ctx_t *ctx; | |
| 2038 | |
| 2039 ctx = ev->data; | |
| 2040 | |
| 2041 ctx->state = NGX_RESOLVE_TIMEDOUT; | |
| 2042 | |
| 2043 ctx->handler(ctx); | |
| 2044 } | |
| 2045 | |
| 2046 | |
| 2047 static void | |
| 2048 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 2049 { | |
| 2050 /* lock alloc mutex */ | |
| 2051 | |
| 2052 if (rn->query) { | |
| 2053 ngx_resolver_free_locked(r, rn->query); | |
| 2054 } | |
| 2055 | |
| 2056 if (rn->name) { | |
| 2057 ngx_resolver_free_locked(r, rn->name); | |
| 2058 } | |
| 2059 | |
| 2060 if (rn->cnlen) { | |
| 2061 ngx_resolver_free_locked(r, rn->u.cname); | |
| 2062 } | |
| 2063 | |
| 2064 if (rn->naddrs > 1) { | |
| 2065 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 2066 } | |
| 2067 | |
| 2068 ngx_resolver_free_locked(r, rn); | |
| 2069 | |
| 2070 /* unlock alloc mutex */ | |
| 2071 } | |
| 2072 | |
| 2073 | |
| 2074 static void * | |
| 2075 ngx_resolver_alloc(ngx_resolver_t *r, size_t size) | |
| 2076 { | |
| 2077 u_char *p; | |
| 2078 | |
| 2079 /* lock alloc mutex */ | |
| 2080 | |
| 2081 p = ngx_alloc(size, r->log); | |
| 2082 | |
| 2083 /* unlock alloc mutex */ | |
| 2084 | |
| 2085 return p; | |
| 2086 } | |
| 2087 | |
| 2088 | |
| 1903 | 2089 static void * |
| 1649 | 2090 ngx_resolver_calloc(ngx_resolver_t *r, size_t size) |
| 2091 { | |
| 2092 u_char *p; | |
| 2093 | |
| 2094 p = ngx_resolver_alloc(r, size); | |
| 2095 | |
| 2096 if (p) { | |
| 2097 ngx_memzero(p, size); | |
| 2098 } | |
| 2099 | |
| 2100 return p; | |
| 2101 } | |
| 2102 | |
| 2103 | |
| 2104 static void | |
| 2105 ngx_resolver_free(ngx_resolver_t *r, void *p) | |
| 2106 { | |
| 2107 /* lock alloc mutex */ | |
| 2108 | |
| 2109 ngx_free(p); | |
| 2110 | |
| 2111 /* unlock alloc mutex */ | |
| 2112 } | |
| 2113 | |
| 2114 | |
| 2115 static void | |
| 2116 ngx_resolver_free_locked(ngx_resolver_t *r, void *p) | |
| 2117 { | |
| 2118 ngx_free(p); | |
| 2119 } | |
| 2120 | |
| 2121 | |
| 2122 static void * | |
| 2123 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size) | |
| 2124 { | |
| 2125 void *dst; | |
| 2126 | |
| 2127 dst = ngx_resolver_alloc(r, size); | |
| 2128 | |
| 2129 if (dst == NULL) { | |
| 2130 return dst; | |
| 2131 } | |
| 2132 | |
| 2133 ngx_memcpy(dst, src, size); | |
| 2134 | |
| 2135 return dst; | |
| 2136 } | |
| 2137 | |
| 2138 | |
|
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Resolver: cached addresses are returned with random rotation now.
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parents:
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diff
changeset
|
2139 static in_addr_t * |
|
c85cefbdaafe
Resolver: cached addresses are returned with random rotation now.
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parents:
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diff
changeset
|
2140 ngx_resolver_rotate(ngx_resolver_t *r, in_addr_t *src, ngx_uint_t n) |
|
c85cefbdaafe
Resolver: cached addresses are returned with random rotation now.
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parents:
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diff
changeset
|
2141 { |
|
c85cefbdaafe
Resolver: cached addresses are returned with random rotation now.
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parents:
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diff
changeset
|
2142 void *dst, *p; |
|
c85cefbdaafe
Resolver: cached addresses are returned with random rotation now.
Maxim Dounin <mdounin@mdounin.ru>
parents:
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diff
changeset
|
2143 ngx_uint_t j; |
|
c85cefbdaafe
Resolver: cached addresses are returned with random rotation now.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4784
diff
changeset
|
2144 |
|
c85cefbdaafe
Resolver: cached addresses are returned with random rotation now.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4784
diff
changeset
|
2145 dst = ngx_resolver_alloc(r, n * sizeof(in_addr_t)); |
|
c85cefbdaafe
Resolver: cached addresses are returned with random rotation now.
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parents:
4784
diff
changeset
|
2146 |
|
4892
063ac68d89dc
Resolver: added missing memory allocation error handling.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4871
diff
changeset
|
2147 if (dst == NULL) { |
|
063ac68d89dc
Resolver: added missing memory allocation error handling.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4871
diff
changeset
|
2148 return dst; |
|
063ac68d89dc
Resolver: added missing memory allocation error handling.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4871
diff
changeset
|
2149 } |
|
063ac68d89dc
Resolver: added missing memory allocation error handling.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4871
diff
changeset
|
2150 |
|
4871
c85cefbdaafe
Resolver: cached addresses are returned with random rotation now.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4784
diff
changeset
|
2151 j = ngx_random() % n; |
|
c85cefbdaafe
Resolver: cached addresses are returned with random rotation now.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4784
diff
changeset
|
2152 |
|
c85cefbdaafe
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Maxim Dounin <mdounin@mdounin.ru>
parents:
4784
diff
changeset
|
2153 if (j == 0) { |
|
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Maxim Dounin <mdounin@mdounin.ru>
parents:
4784
diff
changeset
|
2154 ngx_memcpy(dst, src, n * sizeof(in_addr_t)); |
|
c85cefbdaafe
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Maxim Dounin <mdounin@mdounin.ru>
parents:
4784
diff
changeset
|
2155 return dst; |
|
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Maxim Dounin <mdounin@mdounin.ru>
parents:
4784
diff
changeset
|
2156 } |
|
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Maxim Dounin <mdounin@mdounin.ru>
parents:
4784
diff
changeset
|
2157 |
|
c85cefbdaafe
Resolver: cached addresses are returned with random rotation now.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4784
diff
changeset
|
2158 p = ngx_cpymem(dst, &src[j], (n - j) * sizeof(in_addr_t)); |
|
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Maxim Dounin <mdounin@mdounin.ru>
parents:
4784
diff
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|
2159 ngx_memcpy(p, src, j * sizeof(in_addr_t)); |
|
c85cefbdaafe
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Maxim Dounin <mdounin@mdounin.ru>
parents:
4784
diff
changeset
|
2160 |
|
c85cefbdaafe
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Maxim Dounin <mdounin@mdounin.ru>
parents:
4784
diff
changeset
|
2161 return dst; |
|
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Maxim Dounin <mdounin@mdounin.ru>
parents:
4784
diff
changeset
|
2162 } |
|
c85cefbdaafe
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Maxim Dounin <mdounin@mdounin.ru>
parents:
4784
diff
changeset
|
2163 |
|
c85cefbdaafe
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Maxim Dounin <mdounin@mdounin.ru>
parents:
4784
diff
changeset
|
2164 |
| 1649 | 2165 char * |
| 2166 ngx_resolver_strerror(ngx_int_t err) | |
| 2167 { | |
| 2168 static char *errors[] = { | |
| 2169 "Format error", /* FORMERR */ | |
| 2170 "Server failure", /* SERVFAIL */ | |
| 2171 "Host not found", /* NXDOMAIN */ | |
| 2172 "Unimplemented", /* NOTIMP */ | |
| 2173 "Operation refused" /* REFUSED */ | |
| 2174 }; | |
| 2175 | |
| 2176 if (err > 0 && err < 6) { | |
| 2177 return errors[err - 1]; | |
| 2178 } | |
| 2179 | |
| 2180 if (err == NGX_RESOLVE_TIMEDOUT) { | |
| 2181 return "Operation timed out"; | |
| 2182 } | |
| 2183 | |
| 2184 return "Unknown error"; | |
| 2185 } | |
| 2186 | |
| 2187 | |
|
3408
71193a456616
add context to a resolver log
Igor Sysoev <igor@sysoev.ru>
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diff
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|
2188 static u_char * |
|
71193a456616
add context to a resolver log
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diff
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|
2189 ngx_resolver_log_error(ngx_log_t *log, u_char *buf, size_t len) |
|
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|
2190 { |
|
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|
2191 u_char *p; |
|
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diff
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|
2192 ngx_udp_connection_t *uc; |
|
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|
2193 |
|
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|
2194 p = buf; |
|
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|
2195 |
|
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|
2196 if (log->action) { |
|
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diff
changeset
|
2197 p = ngx_snprintf(buf, len, " while %s", log->action); |
|
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add context to a resolver log
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diff
changeset
|
2198 len -= p - buf; |
|
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|
2199 } |
|
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|
2200 |
|
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|
2201 uc = log->data; |
|
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|
2202 |
|
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|
2203 if (uc) { |
|
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parents:
3376
diff
changeset
|
2204 p = ngx_snprintf(p, len, ", resolver: %V", &uc->server); |
|
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|
2205 } |
|
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|
2206 |
|
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|
2207 return p; |
|
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diff
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|
2208 } |
|
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|
2209 |
|
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add context to a resolver log
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diff
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|
2210 |
| 1649 | 2211 ngx_int_t |
| 2212 ngx_udp_connect(ngx_udp_connection_t *uc) | |
| 2213 { | |
| 2214 int rc; | |
| 2215 ngx_int_t event; | |
| 2216 ngx_event_t *rev, *wev; | |
| 2217 ngx_socket_t s; | |
| 2218 ngx_connection_t *c; | |
| 2219 | |
|
4671
af9342747669
Support for IPv6 literals and an optional port in resolver.
Ruslan Ermilov <ru@nginx.com>
parents:
4653
diff
changeset
|
2220 s = ngx_socket(uc->sockaddr->sa_family, SOCK_DGRAM, 0); |
| 583 | 2221 |
|
3408
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diff
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|
2222 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, &uc->log, 0, "UDP socket %d", s); |
| 583 | 2223 |
| 2224 if (s == -1) { | |
|
3408
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add context to a resolver log
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parents:
3376
diff
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|
2225 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
| 583 | 2226 ngx_socket_n " failed"); |
| 2227 return NGX_ERROR; | |
| 2228 } | |
| 2229 | |
|
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parents:
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diff
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|
2230 c = ngx_get_connection(s, &uc->log); |
| 583 | 2231 |
| 2232 if (c == NULL) { | |
| 2233 if (ngx_close_socket(s) == -1) { | |
|
3408
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diff
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|
2234 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
| 583 | 2235 ngx_close_socket_n "failed"); |
| 2236 } | |
| 2237 | |
| 2238 return NGX_ERROR; | |
| 2239 } | |
| 2240 | |
| 1649 | 2241 if (ngx_nonblocking(s) == -1) { |
|
3408
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diff
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|
2242 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
| 1649 | 2243 ngx_nonblocking_n " failed"); |
| 2244 | |
| 2245 ngx_free_connection(c); | |
| 2246 | |
| 2247 if (ngx_close_socket(s) == -1) { | |
|
3408
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parents:
3376
diff
changeset
|
2248 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
| 1649 | 2249 ngx_close_socket_n " failed"); |
| 2250 } | |
| 2251 | |
| 2252 return NGX_ERROR; | |
| 2253 } | |
| 2254 | |
| 583 | 2255 rev = c->read; |
| 2256 wev = c->write; | |
| 2257 | |
|
3408
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Igor Sysoev <igor@sysoev.ru>
parents:
3376
diff
changeset
|
2258 rev->log = &uc->log; |
|
71193a456616
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diff
changeset
|
2259 wev->log = &uc->log; |
| 1649 | 2260 |
| 2261 uc->connection = c; | |
| 583 | 2262 |
| 2263 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); | |
| 2264 | |
| 2265 #if (NGX_THREADS) | |
| 1649 | 2266 |
| 2267 /* TODO: lock event when call completion handler */ | |
| 2268 | |
| 2269 rev->lock = &c->lock; | |
| 2270 wev->lock = &c->lock; | |
| 583 | 2271 rev->own_lock = &c->lock; |
| 2272 wev->own_lock = &c->lock; | |
| 1649 | 2273 |
| 583 | 2274 #endif |
| 2275 | |
|
3408
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Igor Sysoev <igor@sysoev.ru>
parents:
3376
diff
changeset
|
2276 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, &uc->log, 0, |
| 1649 | 2277 "connect to %V, fd:%d #%d", &uc->server, s, c->number); |
| 2278 | |
| 2279 rc = connect(s, uc->sockaddr, uc->socklen); | |
| 2280 | |
| 2281 /* TODO: aio, iocp */ | |
| 583 | 2282 |
| 2283 if (rc == -1) { | |
|
3408
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Igor Sysoev <igor@sysoev.ru>
parents:
3376
diff
changeset
|
2284 ngx_log_error(NGX_LOG_CRIT, &uc->log, ngx_socket_errno, |
|
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parents:
3376
diff
changeset
|
2285 "connect() failed"); |
| 583 | 2286 |
| 2287 return NGX_ERROR; | |
| 2288 } | |
| 2289 | |
| 1649 | 2290 /* UDP sockets are always ready to write */ |
| 2291 wev->ready = 1; | |
| 2292 | |
| 2293 if (ngx_add_event) { | |
| 2294 | |
| 2295 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ? | |
| 2296 /* kqueue, epoll */ NGX_CLEAR_EVENT: | |
| 2297 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT; | |
| 2298 /* eventport event type has no meaning: oneshot only */ | |
| 2299 | |
| 2300 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { | |
| 2301 return NGX_ERROR; | |
| 2302 } | |
| 2303 | |
| 2304 } else { | |
| 2305 /* rtsig */ | |
| 2306 | |
| 583 | 2307 if (ngx_add_conn(c) == NGX_ERROR) { |
| 2308 return NGX_ERROR; | |
| 2309 } | |
| 2310 } | |
| 2311 | |
| 2312 return NGX_OK; | |
| 2313 } |