Mercurial > hg > nginx
annotate src/core/ngx_resolver.c @ 4450:4919fb357a5d stable-1.0
Merge of r4406, r4413: copyrights updated.
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Sun, 05 Feb 2012 20:02:59 +0000 |
| parents | 7740d2a8d55b |
| children | 79142134d616 |
| rev | line source |
|---|---|
| 583 | 1 |
| 2 /* | |
| 3 * Copyright (C) Igor Sysoev | |
|
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4 * Copyright (C) Nginx, Inc. |
| 583 | 5 */ |
| 6 | |
| 7 | |
| 8 #include <ngx_config.h> | |
| 9 #include <ngx_core.h> | |
| 10 #include <ngx_event.h> | |
| 11 | |
| 12 | |
| 1649 | 13 #define NGX_RESOLVER_UDP_SIZE 4096 |
| 14 | |
| 15 | |
| 583 | 16 typedef struct { |
| 1649 | 17 u_char ident_hi; |
| 18 u_char ident_lo; | |
| 19 u_char flags_hi; | |
| 20 u_char flags_lo; | |
| 21 u_char nqs_hi; | |
| 22 u_char nqs_lo; | |
| 23 u_char nan_hi; | |
| 24 u_char nan_lo; | |
| 25 u_char nns_hi; | |
| 26 u_char nns_lo; | |
| 27 u_char nar_hi; | |
| 28 u_char nar_lo; | |
| 29 } ngx_resolver_query_t; | |
| 30 | |
| 31 | |
| 32 typedef struct { | |
| 33 u_char type_hi; | |
| 34 u_char type_lo; | |
| 35 u_char class_hi; | |
| 36 u_char class_lo; | |
| 37 } ngx_resolver_qs_t; | |
| 38 | |
| 39 | |
| 40 typedef struct { | |
| 41 u_char type_hi; | |
| 42 u_char type_lo; | |
| 43 u_char class_hi; | |
| 44 u_char class_lo; | |
| 45 u_char ttl[4]; | |
| 46 u_char len_hi; | |
| 47 u_char len_lo; | |
| 48 } ngx_resolver_an_t; | |
| 49 | |
| 50 | |
| 51 ngx_int_t ngx_udp_connect(ngx_udp_connection_t *uc); | |
| 52 | |
| 53 | |
| 1906 | 54 static void ngx_resolver_cleanup(void *data); |
| 55 static void ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree); | |
| 1649 | 56 static ngx_int_t ngx_resolve_name_locked(ngx_resolver_t *r, |
| 57 ngx_resolver_ctx_t *ctx); | |
| 58 static void ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
| 59 ngx_queue_t *queue); | |
| 60 static ngx_int_t ngx_resolver_send_query(ngx_resolver_t *r, | |
| 61 ngx_resolver_node_t *rn); | |
| 62 static ngx_int_t ngx_resolver_create_name_query(ngx_resolver_node_t *rn, | |
| 63 ngx_resolver_ctx_t *ctx); | |
| 64 static ngx_int_t ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, | |
| 65 ngx_resolver_ctx_t *ctx); | |
| 66 static void ngx_resolver_resend_handler(ngx_event_t *ev); | |
| 67 static time_t ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
| 68 ngx_queue_t *queue); | |
| 69 static void ngx_resolver_read_response(ngx_event_t *rev); | |
| 70 static void ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, | |
| 71 size_t n); | |
| 72 static void ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t n, | |
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73 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans); |
| 1649 | 74 static void ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, |
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75 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan); |
| 1649 | 76 static ngx_resolver_node_t *ngx_resolver_lookup_name(ngx_resolver_t *r, |
| 77 ngx_str_t *name, uint32_t hash); | |
| 78 static ngx_resolver_node_t *ngx_resolver_lookup_addr(ngx_resolver_t *r, | |
| 79 in_addr_t addr); | |
| 80 static void ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
| 81 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel); | |
| 82 static ngx_int_t ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, | |
| 83 u_char *buf, u_char *src, u_char *last); | |
| 84 static void ngx_resolver_timeout_handler(ngx_event_t *ev); | |
| 85 static void ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn); | |
| 86 static void *ngx_resolver_alloc(ngx_resolver_t *r, size_t size); | |
| 1903 | 87 static void *ngx_resolver_calloc(ngx_resolver_t *r, size_t size); |
| 1649 | 88 static void ngx_resolver_free(ngx_resolver_t *r, void *p); |
| 89 static void ngx_resolver_free_locked(ngx_resolver_t *r, void *p); | |
| 90 static void *ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size); | |
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91 static u_char *ngx_resolver_log_error(ngx_log_t *log, u_char *buf, size_t len); |
| 1649 | 92 |
| 93 | |
| 94 ngx_resolver_t * | |
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95 ngx_resolver_create(ngx_conf_t *cf, ngx_addr_t *addr) |
| 1649 | 96 { |
| 97 ngx_resolver_t *r; | |
| 1906 | 98 ngx_pool_cleanup_t *cln; |
| 1649 | 99 ngx_udp_connection_t *uc; |
| 100 | |
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101 cln = ngx_pool_cleanup_add(cf->pool, 0); |
| 1906 | 102 if (cln == NULL) { |
| 103 return NULL; | |
| 104 } | |
| 105 | |
| 106 cln->handler = ngx_resolver_cleanup; | |
| 107 | |
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108 r = ngx_calloc(sizeof(ngx_resolver_t), cf->log); |
| 1649 | 109 if (r == NULL) { |
| 110 return NULL; | |
| 111 } | |
| 112 | |
| 1906 | 113 cln->data = r; |
| 114 | |
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115 r->event = ngx_calloc(sizeof(ngx_event_t), cf->log); |
| 1649 | 116 if (r->event == NULL) { |
| 117 return NULL; | |
| 118 } | |
| 119 | |
| 1687 | 120 ngx_rbtree_init(&r->name_rbtree, &r->name_sentinel, |
| 121 ngx_resolver_rbtree_insert_value); | |
| 122 | |
| 123 ngx_rbtree_init(&r->addr_rbtree, &r->addr_sentinel, | |
| 124 ngx_rbtree_insert_value); | |
| 1649 | 125 |
| 1685 | 126 ngx_queue_init(&r->name_resend_queue); |
| 127 ngx_queue_init(&r->addr_resend_queue); | |
| 128 | |
| 129 ngx_queue_init(&r->name_expire_queue); | |
| 130 ngx_queue_init(&r->addr_expire_queue); | |
| 1649 | 131 |
| 132 r->event->handler = ngx_resolver_resend_handler; | |
| 133 r->event->data = r; | |
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134 r->event->log = &cf->cycle->new_log; |
| 1649 | 135 r->ident = -1; |
| 136 | |
| 137 r->resend_timeout = 5; | |
| 138 r->expire = 30; | |
| 139 r->valid = 300; | |
| 140 | |
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141 r->log = &cf->cycle->new_log; |
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142 r->log_level = NGX_LOG_ERR; |
| 1649 | 143 |
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144 if (addr) { |
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145 uc = ngx_calloc(sizeof(ngx_udp_connection_t), cf->log); |
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146 if (uc == NULL) { |
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147 return NULL; |
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148 } |
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149 |
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150 r->udp_connection = uc; |
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151 |
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152 uc->sockaddr = addr->sockaddr; |
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153 uc->socklen = addr->socklen; |
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154 uc->server = addr->name; |
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155 |
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156 uc->log = cf->cycle->new_log; |
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157 uc->log.handler = ngx_resolver_log_error; |
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158 uc->log.data = uc; |
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159 uc->log.action = "resolving"; |
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160 } |
| 1649 | 161 |
| 162 return r; | |
| 163 } | |
| 164 | |
| 165 | |
| 1906 | 166 static void |
| 167 ngx_resolver_cleanup(void *data) | |
| 168 { | |
| 169 ngx_resolver_t *r = data; | |
| 170 | |
| 171 if (r) { | |
| 172 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, | |
| 173 "cleanup resolver"); | |
| 174 | |
| 175 ngx_resolver_cleanup_tree(r, &r->name_rbtree); | |
| 176 | |
| 177 ngx_resolver_cleanup_tree(r, &r->addr_rbtree); | |
| 178 | |
| 179 if (r->event) { | |
| 180 ngx_free(r->event); | |
| 181 } | |
| 182 | |
| 183 if (r->udp_connection) { | |
| 184 if (r->udp_connection->connection) { | |
| 185 ngx_close_connection(r->udp_connection->connection); | |
| 186 } | |
| 187 | |
| 188 ngx_free(r->udp_connection); | |
| 189 } | |
| 190 | |
| 191 ngx_free(r); | |
| 192 } | |
| 193 } | |
| 194 | |
| 195 | |
| 196 static void | |
| 197 ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree) | |
| 198 { | |
| 199 ngx_resolver_ctx_t *ctx, *next; | |
| 200 ngx_resolver_node_t *rn; | |
| 201 | |
| 202 while (tree->root != tree->sentinel) { | |
| 203 | |
| 204 rn = (ngx_resolver_node_t *) ngx_rbtree_min(tree->root, tree->sentinel); | |
| 205 | |
| 206 ngx_queue_remove(&rn->queue); | |
| 207 | |
| 208 for (ctx = rn->waiting; ctx; ctx = next) { | |
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209 next = ctx->next; |
| 1906 | 210 |
| 211 if (ctx->event) { | |
| 212 ngx_resolver_free(r, ctx->event); | |
| 213 } | |
| 214 | |
| 215 ngx_resolver_free(r, ctx); | |
| 216 } | |
| 217 | |
| 218 ngx_rbtree_delete(tree, &rn->node); | |
| 219 | |
| 220 ngx_resolver_free_node(r, rn); | |
| 221 } | |
| 222 } | |
| 223 | |
| 224 | |
| 1649 | 225 ngx_resolver_ctx_t * |
| 226 ngx_resolve_start(ngx_resolver_t *r, ngx_resolver_ctx_t *temp) | |
| 227 { | |
| 228 in_addr_t addr; | |
| 229 ngx_resolver_ctx_t *ctx; | |
| 230 | |
| 231 if (temp) { | |
| 232 addr = ngx_inet_addr(temp->name.data, temp->name.len); | |
| 233 | |
| 234 if (addr != INADDR_NONE) { | |
| 235 temp->resolver = r; | |
| 236 temp->state = NGX_OK; | |
| 237 temp->naddrs = 1; | |
| 238 temp->addrs = &temp->addr; | |
| 239 temp->addr = addr; | |
| 240 temp->quick = 1; | |
| 241 | |
| 242 return temp; | |
| 243 } | |
| 244 } | |
| 245 | |
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246 if (r->udp_connection == NULL) { |
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247 return NGX_NO_RESOLVER; |
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248 } |
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249 |
| 1649 | 250 ctx = ngx_resolver_calloc(r, sizeof(ngx_resolver_ctx_t)); |
| 251 | |
| 252 if (ctx) { | |
| 253 ctx->resolver = r; | |
| 254 } | |
| 255 | |
| 256 return ctx; | |
| 257 } | |
| 258 | |
| 259 | |
| 260 ngx_int_t | |
| 261 ngx_resolve_name(ngx_resolver_ctx_t *ctx) | |
| 262 { | |
| 263 ngx_int_t rc; | |
| 264 ngx_resolver_t *r; | |
| 265 | |
| 266 r = ctx->resolver; | |
| 267 | |
| 268 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 269 "resolve: \"%V\"", &ctx->name); | |
| 270 | |
| 271 if (ctx->quick) { | |
| 272 ctx->handler(ctx); | |
| 273 return NGX_OK; | |
| 274 } | |
| 275 | |
| 276 /* lock name mutex */ | |
| 277 | |
| 278 rc = ngx_resolve_name_locked(r, ctx); | |
| 279 | |
| 280 if (rc == NGX_OK) { | |
| 281 return NGX_OK; | |
| 282 } | |
| 283 | |
| 284 /* unlock name mutex */ | |
| 285 | |
| 286 if (rc == NGX_AGAIN) { | |
| 287 return NGX_OK; | |
| 288 } | |
| 289 | |
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290 /* NGX_ERROR */ |
| 1649 | 291 |
| 292 if (ctx->event) { | |
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293 ngx_resolver_free(r, ctx->event); |
| 1649 | 294 } |
| 295 | |
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296 ngx_resolver_free(r, ctx); |
| 1649 | 297 |
| 298 return NGX_ERROR; | |
| 299 } | |
| 300 | |
| 301 | |
| 302 void | |
| 303 ngx_resolve_name_done(ngx_resolver_ctx_t *ctx) | |
| 304 { | |
| 305 uint32_t hash; | |
| 306 ngx_resolver_t *r; | |
| 307 ngx_resolver_ctx_t *w, **p; | |
| 308 ngx_resolver_node_t *rn; | |
| 309 | |
| 310 r = ctx->resolver; | |
| 311 | |
| 312 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 313 "resolve name done: %i", ctx->state); | |
| 314 | |
| 315 if (ctx->quick) { | |
| 316 return; | |
| 317 } | |
| 318 | |
| 319 if (ctx->event && ctx->event->timer_set) { | |
| 320 ngx_del_timer(ctx->event); | |
| 321 } | |
| 322 | |
| 323 /* lock name mutex */ | |
| 324 | |
| 325 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
| 326 | |
| 327 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
| 328 | |
| 329 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
| 330 | |
| 331 if (rn) { | |
| 332 p = &rn->waiting; | |
| 333 w = rn->waiting; | |
| 334 | |
| 335 while (w) { | |
| 336 if (w == ctx) { | |
| 337 *p = w->next; | |
| 338 | |
| 339 goto done; | |
| 340 } | |
| 341 | |
| 342 p = &w->next; | |
| 343 w = w->next; | |
| 344 } | |
| 345 } | |
| 346 | |
| 347 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
| 348 "could not cancel %V resolving", &ctx->name); | |
| 349 } | |
| 350 | |
| 351 done: | |
| 352 | |
| 353 ngx_resolver_expire(r, &r->name_rbtree, &r->name_expire_queue); | |
| 354 | |
| 355 /* unlock name mutex */ | |
| 356 | |
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357 /* lock alloc mutex */ |
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358 |
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359 if (ctx->event) { |
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360 ngx_resolver_free_locked(r, ctx->event); |
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361 } |
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362 |
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363 ngx_resolver_free_locked(r, ctx); |
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364 |
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365 /* unlock alloc mutex */ |
| 1649 | 366 } |
| 367 | |
| 368 | |
| 369 /* NGX_RESOLVE_A only */ | |
| 370 | |
| 371 static ngx_int_t | |
| 372 ngx_resolve_name_locked(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx) | |
| 373 { | |
| 374 uint32_t hash; | |
| 375 in_addr_t addr, *addrs; | |
|
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diff
changeset
|
376 ngx_int_t rc; |
| 1649 | 377 ngx_uint_t naddrs; |
| 378 ngx_resolver_ctx_t *next; | |
| 379 ngx_resolver_node_t *rn; | |
| 380 | |
| 381 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
| 382 | |
| 383 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
| 384 | |
| 385 if (rn) { | |
| 386 | |
| 387 if (rn->valid >= ngx_time()) { | |
| 388 | |
| 389 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
| 390 | |
| 391 ngx_queue_remove(&rn->queue); | |
| 392 | |
| 393 rn->expire = ngx_time() + r->expire; | |
| 394 | |
| 395 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 396 | |
| 397 naddrs = rn->naddrs; | |
| 398 | |
| 399 if (naddrs) { | |
| 400 | |
| 401 /* NGX_RESOLVE_A answer */ | |
| 402 | |
| 403 if (naddrs != 1) { | |
| 404 addr = 0; | |
| 405 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
| 406 naddrs * sizeof(in_addr_t)); | |
| 407 if (addrs == NULL) { | |
| 408 return NGX_ERROR; | |
| 409 } | |
| 410 | |
| 411 } else { | |
| 412 addr = rn->u.addr; | |
| 413 addrs = NULL; | |
| 414 } | |
| 415 | |
| 416 ctx->next = rn->waiting; | |
| 417 rn->waiting = NULL; | |
| 418 | |
| 419 /* unlock name mutex */ | |
| 420 | |
| 421 do { | |
| 422 ctx->state = NGX_OK; | |
| 423 ctx->naddrs = naddrs; | |
| 424 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 425 ctx->addr = addr; | |
| 426 next = ctx->next; | |
| 427 | |
| 428 ctx->handler(ctx); | |
| 429 | |
| 430 ctx = next; | |
| 431 } while (ctx); | |
| 432 | |
| 433 if (addrs) { | |
| 434 ngx_resolver_free(r, addrs); | |
| 435 } | |
| 436 | |
| 437 return NGX_OK; | |
| 438 } | |
| 439 | |
| 440 /* NGX_RESOLVE_CNAME */ | |
| 441 | |
| 1969 | 442 if (ctx->recursion++ < NGX_RESOLVER_MAX_RECURSION) { |
| 443 | |
| 444 ctx->name.len = rn->cnlen; | |
| 445 ctx->name.data = rn->u.cname; | |
| 446 | |
| 447 return ngx_resolve_name_locked(r, ctx); | |
| 448 } | |
| 449 | |
| 450 ctx->next = rn->waiting; | |
| 451 rn->waiting = NULL; | |
| 452 | |
| 453 /* unlock name mutex */ | |
| 454 | |
| 455 do { | |
| 456 ctx->state = NGX_RESOLVE_NXDOMAIN; | |
| 457 next = ctx->next; | |
| 458 | |
| 459 ctx->handler(ctx); | |
| 460 | |
| 461 ctx = next; | |
| 462 } while (ctx); | |
| 463 | |
| 464 return NGX_OK; | |
| 1649 | 465 } |
| 466 | |
| 467 if (rn->waiting) { | |
| 468 | |
| 469 ctx->next = rn->waiting; | |
| 470 rn->waiting = ctx; | |
| 3297 | 471 ctx->state = NGX_AGAIN; |
| 1649 | 472 |
| 473 return NGX_AGAIN; | |
| 474 } | |
| 475 | |
| 476 ngx_queue_remove(&rn->queue); | |
| 477 | |
| 478 /* lock alloc mutex */ | |
| 479 | |
| 480 ngx_resolver_free_locked(r, rn->query); | |
|
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diff
changeset
|
481 rn->query = NULL; |
| 1649 | 482 |
| 483 if (rn->cnlen) { | |
| 484 ngx_resolver_free_locked(r, rn->u.cname); | |
| 485 } | |
| 486 | |
| 487 if (rn->naddrs > 1) { | |
| 488 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 489 } | |
| 490 | |
| 491 /* unlock alloc mutex */ | |
| 492 | |
| 493 } else { | |
| 494 | |
| 495 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
| 496 if (rn == NULL) { | |
| 497 return NGX_ERROR; | |
| 498 } | |
| 499 | |
| 500 rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len); | |
| 501 if (rn->name == NULL) { | |
| 502 ngx_resolver_free(r, rn); | |
| 503 return NGX_ERROR; | |
| 504 } | |
| 505 | |
| 506 rn->node.key = hash; | |
| 507 rn->nlen = (u_short) ctx->name.len; | |
|
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|
508 rn->query = NULL; |
| 1649 | 509 |
| 510 ngx_rbtree_insert(&r->name_rbtree, &rn->node); | |
| 511 } | |
| 512 | |
|
1961
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return NXDOMAIN for ".." in host name
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diff
changeset
|
513 rc = ngx_resolver_create_name_query(rn, ctx); |
|
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diff
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|
514 |
|
99b9feacccb4
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diff
changeset
|
515 if (rc == NGX_ERROR) { |
| 1649 | 516 goto failed; |
| 517 } | |
| 518 | |
|
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
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1960
diff
changeset
|
519 if (rc == NGX_DECLINED) { |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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diff
changeset
|
520 ngx_rbtree_delete(&r->name_rbtree, &rn->node); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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1960
diff
changeset
|
521 |
|
99b9feacccb4
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diff
changeset
|
522 ngx_resolver_free(r, rn->query); |
|
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1960
diff
changeset
|
523 ngx_resolver_free(r, rn->name); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
524 ngx_resolver_free(r, rn); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
525 |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
526 ctx->state = NGX_RESOLVE_NXDOMAIN; |
|
99b9feacccb4
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parents:
1960
diff
changeset
|
527 ctx->handler(ctx); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
528 |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
529 return NGX_OK; |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
530 } |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
531 |
| 1649 | 532 if (ngx_resolver_send_query(r, rn) != NGX_OK) { |
| 533 goto failed; | |
| 534 } | |
| 535 | |
| 536 if (ctx->event == NULL) { | |
| 537 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
| 538 if (ctx->event == NULL) { | |
| 539 goto failed; | |
| 540 } | |
| 541 | |
| 542 ctx->event->handler = ngx_resolver_timeout_handler; | |
| 543 ctx->event->data = ctx; | |
| 544 ctx->event->log = r->log; | |
| 545 ctx->ident = -1; | |
| 546 | |
| 547 ngx_add_timer(ctx->event, ctx->timeout); | |
| 548 } | |
| 549 | |
| 550 if (ngx_queue_empty(&r->name_resend_queue)) { | |
| 551 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
| 552 } | |
| 553 | |
| 554 rn->expire = ngx_time() + r->resend_timeout; | |
| 555 | |
| 556 ngx_queue_insert_head(&r->name_resend_queue, &rn->queue); | |
| 557 | |
| 558 rn->cnlen = 0; | |
| 559 rn->naddrs = 0; | |
| 560 rn->valid = 0; | |
| 561 rn->waiting = ctx; | |
| 562 | |
| 563 ctx->state = NGX_AGAIN; | |
| 564 | |
| 565 return NGX_AGAIN; | |
| 566 | |
| 567 failed: | |
| 568 | |
| 569 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 570 | |
|
1960
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fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
571 if (rn->query) { |
|
1609b3c3d604
fix memory leak on resolver query send failure
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1914
diff
changeset
|
572 ngx_resolver_free(r, rn->query); |
|
1609b3c3d604
fix memory leak on resolver query send failure
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1914
diff
changeset
|
573 } |
|
1609b3c3d604
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diff
changeset
|
574 |
| 1649 | 575 ngx_resolver_free(r, rn->name); |
| 576 | |
| 577 ngx_resolver_free(r, rn); | |
| 578 | |
| 579 return NGX_ERROR; | |
| 580 } | |
| 583 | 581 |
| 582 | |
| 583 ngx_int_t | |
| 1649 | 584 ngx_resolve_addr(ngx_resolver_ctx_t *ctx) |
| 585 { | |
|
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
586 u_char *name; |
| 1649 | 587 ngx_resolver_t *r; |
| 588 ngx_resolver_node_t *rn; | |
| 589 | |
| 590 r = ctx->resolver; | |
| 591 | |
| 592 ctx->addr = ntohl(ctx->addr); | |
| 593 | |
| 594 /* lock addr mutex */ | |
| 595 | |
| 596 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
| 597 | |
| 598 if (rn) { | |
| 599 | |
| 600 if (rn->valid >= ngx_time()) { | |
| 601 | |
| 602 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
| 603 | |
| 604 ngx_queue_remove(&rn->queue); | |
| 605 | |
| 606 rn->expire = ngx_time() + r->expire; | |
| 607 | |
| 608 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
| 609 | |
|
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
610 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
|
611 if (name == NULL) { |
| 1649 | 612 goto failed; |
| 613 } | |
| 614 | |
|
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
615 ctx->name.len = rn->nlen; |
|
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
616 ctx->name.data = name; |
|
cf3cd450049c
store name pointer in variable allocated on stack
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parents:
2483
diff
changeset
|
617 |
| 1649 | 618 /* unlock addr mutex */ |
| 619 | |
| 620 ctx->state = NGX_OK; | |
| 621 | |
| 622 ctx->handler(ctx); | |
| 623 | |
|
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
624 ngx_resolver_free(r, name); |
| 1649 | 625 |
| 626 return NGX_OK; | |
| 627 } | |
| 628 | |
| 629 if (rn->waiting) { | |
| 630 | |
| 631 ctx->next = rn->waiting; | |
| 632 rn->waiting = ctx; | |
| 3297 | 633 ctx->state = NGX_AGAIN; |
| 1649 | 634 |
|
2487
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
635 /* unlock addr mutex */ |
|
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
636 |
|
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
637 return NGX_OK; |
| 1649 | 638 } |
| 639 | |
| 640 ngx_queue_remove(&rn->queue); | |
| 641 | |
| 642 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
|
643 rn->query = NULL; |
| 1649 | 644 |
| 645 } else { | |
| 646 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
| 647 if (rn == NULL) { | |
| 648 goto failed; | |
| 649 } | |
| 650 | |
| 651 rn->node.key = ctx->addr; | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
652 rn->query = NULL; |
| 1649 | 653 |
| 654 ngx_rbtree_insert(&r->addr_rbtree, &rn->node); | |
| 655 } | |
| 656 | |
| 657 if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) { | |
| 658 goto failed; | |
| 659 } | |
| 660 | |
| 661 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
| 662 goto failed; | |
| 663 } | |
| 664 | |
| 665 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
| 666 if (ctx->event == NULL) { | |
| 667 goto failed; | |
| 668 } | |
| 669 | |
| 670 ctx->event->handler = ngx_resolver_timeout_handler; | |
| 671 ctx->event->data = ctx; | |
| 672 ctx->event->log = r->log; | |
| 673 ctx->ident = -1; | |
| 674 | |
| 675 ngx_add_timer(ctx->event, ctx->timeout); | |
| 676 | |
| 677 if (ngx_queue_empty(&r->addr_resend_queue)) { | |
| 678 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
| 679 } | |
| 680 | |
| 681 rn->expire = ngx_time() + r->resend_timeout; | |
| 682 | |
| 683 ngx_queue_insert_head(&r->addr_resend_queue, &rn->queue); | |
| 684 | |
| 685 rn->cnlen = 0; | |
| 686 rn->naddrs = 0; | |
| 687 rn->name = NULL; | |
| 688 rn->nlen = 0; | |
| 689 rn->valid = 0; | |
| 690 rn->waiting = ctx; | |
| 691 | |
| 692 /* unlock addr mutex */ | |
| 693 | |
| 694 ctx->state = NGX_AGAIN; | |
| 695 | |
| 696 return NGX_OK; | |
| 697 | |
| 698 failed: | |
| 699 | |
| 700 if (rn) { | |
| 701 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 702 | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
703 if (rn->query) { |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
704 ngx_resolver_free(r, rn->query); |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
705 } |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
706 |
| 1649 | 707 ngx_resolver_free(r, rn); |
| 708 } | |
| 709 | |
| 710 /* unlock addr mutex */ | |
| 711 | |
| 712 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
|
713 ngx_resolver_free(r, ctx->event); |
| 1649 | 714 } |
| 715 | |
|
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
716 ngx_resolver_free(r, ctx); |
| 1649 | 717 |
| 718 return NGX_ERROR; | |
| 719 } | |
| 720 | |
| 721 | |
| 722 void | |
| 723 ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx) | |
| 724 { | |
| 725 in_addr_t addr; | |
| 726 ngx_resolver_t *r; | |
| 727 ngx_resolver_ctx_t *w, **p; | |
| 728 ngx_resolver_node_t *rn; | |
| 729 | |
| 730 r = ctx->resolver; | |
| 731 | |
| 732 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 733 "resolve addr done: %i", ctx->state); | |
| 734 | |
| 735 if (ctx->event && ctx->event->timer_set) { | |
| 736 ngx_del_timer(ctx->event); | |
| 737 } | |
| 738 | |
| 739 /* lock addr mutex */ | |
| 740 | |
| 741 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
| 742 | |
| 743 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
| 744 | |
| 745 if (rn) { | |
| 746 p = &rn->waiting; | |
| 747 w = rn->waiting; | |
| 748 | |
| 749 while (w) { | |
| 750 if (w == ctx) { | |
| 751 *p = w->next; | |
| 752 | |
| 753 goto done; | |
| 754 } | |
| 755 | |
| 756 p = &w->next; | |
| 757 w = w->next; | |
| 758 } | |
| 759 } | |
| 760 | |
| 761 addr = ntohl(ctx->addr); | |
| 762 | |
| 763 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
| 764 "could not cancel %ud.%ud.%ud.%ud resolving", | |
| 765 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 766 (addr >> 8) & 0xff, addr & 0xff); | |
| 767 } | |
| 768 | |
| 769 done: | |
| 770 | |
| 771 ngx_resolver_expire(r, &r->addr_rbtree, &r->addr_expire_queue); | |
| 772 | |
| 773 /* unlock addr mutex */ | |
| 774 | |
|
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
775 /* 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
|
776 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
777 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
|
778 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
|
779 } |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
780 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
781 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
|
782 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
783 /* unlock alloc mutex */ |
| 1649 | 784 } |
| 785 | |
| 786 | |
| 787 static void | |
| 788 ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 789 { | |
| 790 time_t now; | |
| 791 ngx_uint_t i; | |
| 792 ngx_queue_t *q; | |
| 793 ngx_resolver_node_t *rn; | |
| 794 | |
| 795 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire"); | |
| 796 | |
| 797 now = ngx_time(); | |
| 798 | |
| 799 for (i = 0; i < 2; i++) { | |
| 800 if (ngx_queue_empty(queue)) { | |
| 801 return; | |
| 802 } | |
| 803 | |
| 804 q = ngx_queue_last(queue); | |
| 805 | |
| 806 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 807 | |
| 808 if (now <= rn->expire) { | |
| 809 return; | |
| 810 } | |
| 811 | |
| 1774 | 812 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, |
| 813 "resolver expire \"%*s\"", (size_t) rn->nlen, rn->name); | |
| 1649 | 814 |
| 815 ngx_queue_remove(q); | |
| 816 | |
| 817 ngx_rbtree_delete(tree, &rn->node); | |
| 818 | |
| 819 ngx_resolver_free_node(r, rn); | |
| 820 } | |
| 821 } | |
| 822 | |
| 823 | |
| 824 static ngx_int_t | |
| 825 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 826 { | |
| 827 ssize_t n; | |
| 828 ngx_udp_connection_t *uc; | |
| 829 | |
| 830 uc = r->udp_connection; | |
| 831 | |
| 832 if (uc->connection == NULL) { | |
| 833 if (ngx_udp_connect(uc) != NGX_OK) { | |
| 834 return NGX_ERROR; | |
| 835 } | |
| 836 | |
| 837 uc->connection->data = r; | |
| 838 uc->connection->read->handler = ngx_resolver_read_response; | |
| 1906 | 839 uc->connection->read->resolver = 1; |
| 1649 | 840 } |
| 841 | |
| 842 n = ngx_send(uc->connection, rn->query, rn->qlen); | |
| 843 | |
| 844 if (n == -1) { | |
| 845 return NGX_ERROR; | |
| 846 } | |
| 847 | |
| 848 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
|
849 ngx_log_error(NGX_LOG_CRIT, &uc->log, 0, "send() incomplete"); |
| 1649 | 850 return NGX_ERROR; |
| 851 } | |
| 852 | |
| 853 return NGX_OK; | |
| 854 } | |
| 855 | |
| 856 | |
| 857 static void | |
| 858 ngx_resolver_resend_handler(ngx_event_t *ev) | |
| 859 { | |
| 860 time_t timer, atimer, ntimer; | |
| 861 ngx_resolver_t *r; | |
| 862 | |
| 863 r = ev->data; | |
| 864 | |
| 865 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 866 "resolver resend handler"); | |
| 867 | |
| 868 /* lock name mutex */ | |
| 869 | |
| 870 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue); | |
| 871 | |
| 872 /* unlock name mutex */ | |
| 873 | |
| 874 /* lock addr mutex */ | |
| 875 | |
| 876 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
|
877 |
| 1649 | 878 /* unlock addr mutex */ |
| 879 | |
| 880 if (ntimer == 0) { | |
| 881 timer = atimer; | |
| 882 | |
| 883 } else if (atimer == 0) { | |
| 884 timer = ntimer; | |
| 885 | |
| 886 } else { | |
| 887 timer = (atimer < ntimer) ? atimer : ntimer; | |
| 888 } | |
| 889 | |
| 890 if (timer) { | |
| 891 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000)); | |
| 892 } | |
| 893 } | |
| 894 | |
| 895 | |
| 896 static time_t | |
| 897 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 898 { | |
| 899 time_t now; | |
| 900 ngx_queue_t *q; | |
| 901 ngx_resolver_node_t *rn; | |
| 902 | |
| 903 now = ngx_time(); | |
| 904 | |
| 905 for ( ;; ) { | |
| 906 if (ngx_queue_empty(queue)) { | |
| 907 return 0; | |
| 908 } | |
| 909 | |
| 910 q = ngx_queue_last(queue); | |
| 911 | |
| 912 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 913 | |
| 914 if (now < rn->expire) { | |
| 915 return rn->expire - now; | |
| 916 } | |
| 917 | |
| 1774 | 918 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, |
| 919 "resolver resend \"%*s\" %p", | |
| 920 (size_t) rn->nlen, rn->name, rn->waiting); | |
| 1649 | 921 |
| 922 ngx_queue_remove(q); | |
| 923 | |
| 924 if (rn->waiting) { | |
| 925 | |
| 926 if (ngx_resolver_send_query(r, rn) == NGX_OK) { | |
| 927 | |
| 928 rn->expire = now + r->resend_timeout; | |
| 929 | |
| 930 ngx_queue_insert_head(queue, &rn->queue); | |
| 931 } | |
|
1879
cf4ee321d195
do not delete failed DNS request if there are waiting clients
Igor Sysoev <igor@sysoev.ru>
parents:
1878
diff
changeset
|
932 |
|
cf4ee321d195
do not delete failed DNS request if there are waiting clients
Igor Sysoev <igor@sysoev.ru>
parents:
1878
diff
changeset
|
933 continue; |
| 1649 | 934 } |
| 935 | |
| 936 ngx_rbtree_delete(tree, &rn->node); | |
| 937 | |
| 938 ngx_resolver_free_node(r, rn); | |
| 939 } | |
| 940 } | |
| 941 | |
| 942 | |
| 943 static void | |
| 944 ngx_resolver_read_response(ngx_event_t *rev) | |
| 945 { | |
| 946 ssize_t n; | |
| 947 ngx_connection_t *c; | |
| 948 u_char buf[NGX_RESOLVER_UDP_SIZE]; | |
| 949 | |
| 950 c = rev->data; | |
| 951 | |
| 952 do { | |
| 1689 | 953 n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE); |
| 954 | |
| 955 if (n < 0) { | |
| 1649 | 956 return; |
| 957 } | |
| 958 | |
| 959 ngx_resolver_process_response(c->data, buf, n); | |
| 960 | |
| 961 } while (rev->ready); | |
| 962 } | |
| 963 | |
| 964 | |
| 965 static void | |
| 966 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n) | |
| 967 { | |
| 968 char *err; | |
| 969 size_t len; | |
|
2282
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
970 ngx_uint_t i, times, ident, qident, flags, code, nqs, nan, |
|
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parents:
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diff
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|
971 qtype, qclass; |
|
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2281
diff
changeset
|
972 ngx_queue_t *q; |
| 1649 | 973 ngx_resolver_qs_t *qs; |
|
2282
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Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
974 ngx_resolver_node_t *rn; |
| 1649 | 975 ngx_resolver_query_t *query; |
| 976 | |
|
2281
5004229420a6
FORMERR DNS response may be equal to mininal query size
Igor Sysoev <igor@sysoev.ru>
parents:
2006
diff
changeset
|
977 if ((size_t) n < sizeof(ngx_resolver_query_t)) { |
| 1649 | 978 goto short_response; |
| 979 } | |
| 980 | |
| 981 query = (ngx_resolver_query_t *) buf; | |
| 982 | |
| 983 ident = (query->ident_hi << 8) + query->ident_lo; | |
| 984 flags = (query->flags_hi << 8) + query->flags_lo; | |
| 985 nqs = (query->nqs_hi << 8) + query->nqs_lo; | |
| 986 nan = (query->nan_hi << 8) + query->nan_lo; | |
| 987 | |
| 988 ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0, | |
|
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
989 "resolver DNS response %ui fl:%04Xui %ui/%ui/%ui/%ui", |
| 1649 | 990 ident, flags, nqs, nan, |
| 991 (query->nns_hi << 8) + query->nns_lo, | |
| 992 (query->nar_hi << 8) + query->nar_lo); | |
| 993 | |
| 994 if (!(flags & 0x8000)) { | |
| 995 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
|
996 "invalid DNS response %ui fl:%04Xui", ident, flags); |
| 1649 | 997 return; |
| 998 } | |
| 999 | |
| 1000 code = flags & 0x7f; | |
| 1001 | |
|
2282
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1002 if (code == NGX_RESOLVE_FORMERR) { |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1003 |
|
ec97eb9a8038
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Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1004 times = 0; |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1005 |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1006 for (q = ngx_queue_head(&r->name_resend_queue); |
|
ec97eb9a8038
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Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1007 q != ngx_queue_sentinel(&r->name_resend_queue) || times++ < 100; |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1008 q = ngx_queue_next(q)) |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1009 { |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1010 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1011 qident = (rn->query[0] << 8) + rn->query[1]; |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1012 |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1013 if (qident == ident) { |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1014 ngx_log_error(r->log_level, r->log, 0, |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1015 "DNS error (%ui: %s), query id:%ui, name:\"%*s\"", |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1016 code, ngx_resolver_strerror(code), ident, |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1017 rn->nlen, rn->name); |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1018 return; |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1019 } |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1020 } |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1021 |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1022 goto dns_error; |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1023 } |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1024 |
|
ec97eb9a8038
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Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1025 if (code > NGX_RESOLVE_REFUSED) { |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1026 goto dns_error; |
| 1649 | 1027 } |
| 1028 | |
| 1029 if (nqs != 1) { | |
| 1030 err = "invalid number of questions in DNS response"; | |
| 1031 goto done; | |
| 1032 } | |
| 1033 | |
| 1034 i = sizeof(ngx_resolver_query_t); | |
| 1035 | |
| 1036 while (i < (ngx_uint_t) n) { | |
| 1037 if (buf[i] == '\0') { | |
| 1038 goto found; | |
| 1039 } | |
| 1040 | |
| 1041 len = buf[i]; | |
| 1042 i += 1 + len; | |
| 1043 } | |
| 1044 | |
| 1045 goto short_response; | |
| 1046 | |
| 1047 found: | |
| 1048 | |
| 1049 if (i++ == 0) { | |
| 1050 err = "zero-length domain name in DNS response"; | |
| 1051 goto done; | |
| 1052 } | |
| 1053 | |
| 1054 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t)) | |
| 1055 > (ngx_uint_t) n) | |
| 1056 { | |
| 1057 goto short_response; | |
| 1058 } | |
| 1059 | |
| 1060 qs = (ngx_resolver_qs_t *) &buf[i]; | |
| 1061 | |
| 1062 qtype = (qs->type_hi << 8) + qs->type_lo; | |
| 1063 qclass = (qs->class_hi << 8) + qs->class_lo; | |
| 1064 | |
| 1065 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
|
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1066 "resolver DNS response qt:%ui cl:%ui", qtype, qclass); |
| 1649 | 1067 |
| 1068 if (qclass != 1) { | |
| 1069 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
|
1070 "unknown query class %ui in DNS response", qclass); |
| 1649 | 1071 return; |
| 1072 } | |
| 1073 | |
| 1074 switch (qtype) { | |
| 1075 | |
| 1076 case NGX_RESOLVE_A: | |
| 1077 | |
| 1078 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
|
1079 i + sizeof(ngx_resolver_qs_t)); |
| 1649 | 1080 |
| 1081 break; | |
| 1082 | |
| 1083 case NGX_RESOLVE_PTR: | |
| 1084 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1085 ngx_resolver_process_ptr(r, buf, n, ident, code, nan); |
| 1649 | 1086 |
| 1087 break; | |
| 1088 | |
| 1089 default: | |
| 1090 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
|
1091 "unknown query type %ui in DNS response", qtype); |
| 1649 | 1092 return; |
| 1093 } | |
| 1094 | |
| 1095 return; | |
| 1096 | |
| 1097 short_response: | |
| 1098 | |
| 1099 err = "short dns response"; | |
| 1100 | |
| 1101 done: | |
| 1102 | |
| 1103 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1104 | |
| 1105 return; | |
|
2282
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Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1106 |
|
ec97eb9a8038
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parents:
2281
diff
changeset
|
1107 dns_error: |
|
ec97eb9a8038
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parents:
2281
diff
changeset
|
1108 |
|
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2281
diff
changeset
|
1109 ngx_log_error(r->log_level, r->log, 0, |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1110 "DNS error (%ui: %s), query id:%ui", |
|
ec97eb9a8038
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parents:
2281
diff
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|
1111 code, ngx_resolver_strerror(code), ident); |
|
ec97eb9a8038
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parents:
2281
diff
changeset
|
1112 return; |
| 1649 | 1113 } |
| 1114 | |
| 1115 | |
| 1116 static void | |
| 1117 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last, | |
| 1118 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans) | |
| 583 | 1119 { |
| 1649 | 1120 char *err; |
| 1121 u_char *cname; | |
| 1122 size_t len; | |
| 1123 uint32_t hash; | |
| 1124 in_addr_t addr, *addrs; | |
| 1125 ngx_str_t name; | |
| 1126 ngx_uint_t qtype, qident, naddrs, a, i, n, start; | |
| 1127 ngx_resolver_an_t *an; | |
| 1128 ngx_resolver_ctx_t *ctx, *next; | |
| 1129 ngx_resolver_node_t *rn; | |
| 1130 | |
| 1131 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) { | |
| 1132 return; | |
| 1133 } | |
| 1134 | |
| 1135 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); | |
| 1136 | |
| 1137 hash = ngx_crc32_short(name.data, name.len); | |
| 1138 | |
| 1139 /* lock name mutex */ | |
| 1140 | |
| 1141 rn = ngx_resolver_lookup_name(r, &name, hash); | |
| 1142 | |
| 1143 if (rn == NULL || rn->query == NULL) { | |
| 1144 ngx_log_error(r->log_level, r->log, 0, | |
| 1145 "unexpected response for %V", &name); | |
| 1146 goto failed; | |
| 1147 } | |
| 1148 | |
| 1149 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 1150 | |
| 1151 if (ident != qident) { | |
| 1152 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
|
1153 "wrong ident %ui response for %V, expect %ui", |
| 1649 | 1154 ident, &name, qident); |
| 1155 goto failed; | |
| 1156 } | |
| 1157 | |
| 3139 | 1158 ngx_resolver_free(r, name.data); |
| 1159 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1160 if (code == 0 && nan == 0) { |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1161 code = 3; /* NXDOMAIN */ |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1162 } |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1163 |
| 1649 | 1164 if (code) { |
| 1165 next = rn->waiting; | |
| 1166 rn->waiting = NULL; | |
| 1167 | |
| 1168 ngx_queue_remove(&rn->queue); | |
| 1169 | |
| 1170 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 1171 | |
| 1172 ngx_resolver_free_node(r, rn); | |
| 1173 | |
| 1174 /* unlock name mutex */ | |
| 1175 | |
| 1176 while (next) { | |
| 1177 ctx = next; | |
| 1178 ctx->state = code; | |
| 1179 next = ctx->next; | |
| 1180 | |
| 1181 ctx->handler(ctx); | |
| 1182 } | |
| 1183 | |
| 1184 return; | |
| 1185 } | |
| 1186 | |
| 1187 i = ans; | |
| 1188 naddrs = 0; | |
| 1189 addr = 0; | |
| 1190 addrs = NULL; | |
| 1191 cname = NULL; | |
| 1192 qtype = 0; | |
| 1193 | |
| 1194 for (a = 0; a < nan; a++) { | |
| 1195 | |
| 1196 start = i; | |
| 1197 | |
| 1198 while (i < last) { | |
| 1199 | |
| 1200 if (buf[i] & 0xc0) { | |
| 1201 i += 2; | |
| 1202 goto found; | |
| 1203 } | |
| 1204 | |
| 1205 if (buf[i] == 0) { | |
| 1206 i++; | |
| 1207 goto test_length; | |
| 1208 } | |
| 1209 | |
| 1210 i += 1 + buf[i]; | |
| 1211 } | |
| 1212 | |
| 1213 goto short_response; | |
| 1214 | |
| 1215 test_length: | |
| 1216 | |
| 1217 if (i - start < 2) { | |
| 1218 err = "invalid name in dns response"; | |
| 1219 goto invalid; | |
| 1220 } | |
| 1221 | |
| 1222 found: | |
| 1223 | |
| 1224 if (i + sizeof(ngx_resolver_an_t) >= last) { | |
| 1225 goto short_response; | |
| 1226 } | |
| 1227 | |
| 1228 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1229 | |
| 1230 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1231 len = (an->len_hi << 8) + an->len_lo; | |
| 1232 | |
| 1233 if (qtype == NGX_RESOLVE_A) { | |
| 1234 | |
| 1235 i += sizeof(ngx_resolver_an_t); | |
| 1236 | |
| 1237 if (i + len > last) { | |
| 1238 goto short_response; | |
| 1239 } | |
| 1240 | |
| 1241 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1242 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1243 | |
| 1244 naddrs++; | |
| 1245 | |
| 1246 i += len; | |
| 1247 | |
| 1248 } else if (qtype == NGX_RESOLVE_CNAME) { | |
| 1249 cname = &buf[i] + sizeof(ngx_resolver_an_t); | |
| 1250 i += sizeof(ngx_resolver_an_t) + len; | |
| 1965 | 1251 |
| 1252 } else if (qtype == NGX_RESOLVE_DNAME) { | |
| 1253 i += sizeof(ngx_resolver_an_t) + len; | |
| 1966 | 1254 |
| 1255 } else { | |
| 1256 ngx_log_error(r->log_level, r->log, 0, | |
| 1257 "unexpected qtype %ui", qtype); | |
| 1649 | 1258 } |
| 1259 } | |
| 1260 | |
| 1261 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1262 "resolver naddrs:%ui cname:%p", naddrs, cname); | |
| 1263 | |
| 1264 if (naddrs) { | |
| 1265 | |
| 1266 if (naddrs == 1) { | |
| 1267 rn->u.addr = addr; | |
| 1268 | |
| 1269 } else { | |
| 1270 | |
| 1271 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t)); | |
| 1272 if (addrs == NULL) { | |
| 1273 return; | |
| 1274 } | |
| 1275 | |
| 1276 n = 0; | |
| 1277 i = ans; | |
| 1278 | |
| 1279 for (a = 0; a < nan; a++) { | |
| 1280 | |
| 1281 for ( ;; ) { | |
| 1282 | |
| 1283 if (buf[i] & 0xc0) { | |
| 1284 i += 2; | |
| 1285 goto ok; | |
| 1286 } | |
| 1287 | |
| 1288 if (buf[i] == 0) { | |
| 1289 i++; | |
| 1290 goto ok; | |
| 1291 } | |
| 1292 | |
| 1293 i += 1 + buf[i]; | |
| 1294 } | |
| 1295 | |
| 1296 ok: | |
| 1297 | |
| 1298 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1299 | |
| 1300 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1301 len = (an->len_hi << 8) + an->len_lo; | |
| 1302 | |
| 1303 i += sizeof(ngx_resolver_an_t); | |
| 1304 | |
| 1305 if (qtype == NGX_RESOLVE_A) { | |
| 1306 | |
| 1307 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1308 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1309 | |
| 1310 if (n == naddrs) { | |
| 1311 break; | |
| 1312 } | |
| 1313 } | |
| 1314 | |
| 1315 i += len; | |
| 1316 } | |
| 1317 | |
| 1318 rn->u.addrs = addrs; | |
| 1319 | |
| 1320 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
| 1321 naddrs * sizeof(in_addr_t)); | |
| 1322 if (addrs == NULL) { | |
| 1323 return; | |
| 1324 } | |
| 1325 } | |
| 1326 | |
| 1327 rn->naddrs = (u_short) naddrs; | |
| 1328 | |
| 1329 ngx_queue_remove(&rn->queue); | |
| 1330 | |
| 1331 rn->valid = ngx_time() + r->valid; | |
| 1332 rn->expire = ngx_time() + r->expire; | |
| 1333 | |
| 1334 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1335 | |
| 1336 next = rn->waiting; | |
| 1337 rn->waiting = NULL; | |
| 1338 | |
| 1339 /* unlock name mutex */ | |
| 1340 | |
| 1341 while (next) { | |
| 1342 ctx = next; | |
| 1343 ctx->state = NGX_OK; | |
| 1344 ctx->naddrs = naddrs; | |
| 1345 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 1346 ctx->addr = addr; | |
| 1347 next = ctx->next; | |
| 1348 | |
| 1349 ctx->handler(ctx); | |
| 1350 } | |
| 1351 | |
|
2483
29494780d978
free addrs only it has been allocated before: non single address
Igor Sysoev <igor@sysoev.ru>
parents:
2482
diff
changeset
|
1352 if (naddrs > 1) { |
| 1649 | 1353 ngx_resolver_free(r, addrs); |
| 1354 } | |
| 1355 | |
| 1356 return; | |
| 1357 | |
| 1358 } else if (cname) { | |
| 1359 | |
| 1360 /* CNAME only */ | |
| 1361 | |
| 1362 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) { | |
| 1363 return; | |
| 1364 } | |
| 1365 | |
| 1366 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1367 "resolver cname:\"%V\"", &name); | |
| 1368 | |
|
1741
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1369 ngx_queue_remove(&rn->queue); |
|
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1370 |
| 1649 | 1371 rn->cnlen = (u_short) name.len; |
| 1372 rn->u.cname = name.data; | |
| 1373 rn->valid = ngx_time() + r->valid; | |
| 1374 rn->expire = ngx_time() + r->expire; | |
| 1375 | |
| 1376 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1377 | |
| 1378 ctx = rn->waiting; | |
| 1379 rn->waiting = NULL; | |
| 1380 | |
| 1381 if (ctx) { | |
| 1382 ctx->name = name; | |
| 1383 | |
| 1384 (void) ngx_resolve_name_locked(r, ctx); | |
| 1385 } | |
| 1386 | |
| 1387 return; | |
| 1388 } | |
| 1389 | |
| 1390 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
|
1391 "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
|
1392 qtype); |
| 1649 | 1393 return; |
| 1394 | |
| 1395 short_response: | |
| 1396 | |
| 1397 err = "short dns response"; | |
| 1398 | |
| 1399 invalid: | |
| 1400 | |
| 1401 /* unlock name mutex */ | |
| 1402 | |
| 1403 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1404 | |
| 1405 return; | |
| 1406 | |
| 1407 failed: | |
| 1408 | |
| 1409 /* unlock name mutex */ | |
| 1410 | |
| 3139 | 1411 ngx_resolver_free(r, name.data); |
| 1412 | |
| 1649 | 1413 return; |
| 1414 } | |
| 1415 | |
| 1416 | |
| 1417 static void | |
| 1418 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
|
1419 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan) |
| 1649 | 1420 { |
| 1421 char *err; | |
| 1422 size_t len; | |
| 1423 in_addr_t addr; | |
| 1424 ngx_int_t digit; | |
| 1425 ngx_str_t name; | |
|
3902
159b58f9c0bd
fix building by gcc 4.6 without --with-debug
Igor Sysoev <igor@sysoev.ru>
parents:
3763
diff
changeset
|
1426 ngx_uint_t i, mask, qident; |
| 1649 | 1427 ngx_resolver_an_t *an; |
| 1428 ngx_resolver_ctx_t *ctx, *next; | |
| 1429 ngx_resolver_node_t *rn; | |
| 1430 | |
| 1431 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) { | |
| 1432 goto invalid_in_addr_arpa; | |
| 1433 } | |
| 1434 | |
| 1435 addr = 0; | |
| 1436 i = 12; | |
| 1437 | |
| 1438 for (mask = 0; mask < 32; mask += 8) { | |
| 1439 len = buf[i++]; | |
| 1440 | |
| 1441 digit = ngx_atoi(&buf[i], len); | |
| 1442 if (digit == NGX_ERROR || digit > 255) { | |
| 1443 goto invalid_in_addr_arpa; | |
| 1444 } | |
| 1445 | |
| 1446 addr += digit << mask; | |
| 1447 i += len; | |
| 1448 } | |
| 1449 | |
| 1450 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) { | |
| 1451 goto invalid_in_addr_arpa; | |
| 1452 } | |
| 1453 | |
| 1454 /* lock addr mutex */ | |
| 1455 | |
| 1456 rn = ngx_resolver_lookup_addr(r, addr); | |
| 1457 | |
| 1458 if (rn == NULL || rn->query == NULL) { | |
| 1459 ngx_log_error(r->log_level, r->log, 0, | |
| 1460 "unexpected response for %ud.%ud.%ud.%ud", | |
| 1461 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 1462 (addr >> 8) & 0xff, addr & 0xff); | |
| 1463 goto failed; | |
| 1464 } | |
| 1465 | |
| 1466 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 1467 | |
| 1468 if (ident != qident) { | |
| 1469 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
|
1470 "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
|
1471 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff, |
|
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1472 (addr >> 8) & 0xff, addr & 0xff, qident); |
| 1649 | 1473 goto failed; |
| 1474 } | |
| 1475 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1476 if (code == 0 && nan == 0) { |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1477 code = 3; /* NXDOMAIN */ |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1478 } |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1479 |
| 1649 | 1480 if (code) { |
| 1481 next = rn->waiting; | |
| 1482 rn->waiting = NULL; | |
| 1483 | |
| 1484 ngx_queue_remove(&rn->queue); | |
| 1485 | |
| 1486 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 1487 | |
| 1488 ngx_resolver_free_node(r, rn); | |
| 1489 | |
| 1490 /* unlock addr mutex */ | |
| 1491 | |
| 1492 while (next) { | |
| 1493 ctx = next; | |
| 1494 ctx->state = code; | |
| 1495 next = ctx->next; | |
| 1496 | |
| 1497 ctx->handler(ctx); | |
| 1498 } | |
| 1499 | |
| 1500 return; | |
| 1501 } | |
| 1502 | |
| 1503 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t); | |
| 1504 | |
| 1505 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) { | |
| 1506 goto short_response; | |
| 1507 } | |
| 1508 | |
| 1509 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */ | |
| 1510 | |
| 1511 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) { | |
| 1512 err = "invalid in-addr.arpa name in DNS response"; | |
| 1513 goto invalid; | |
| 1514 } | |
| 1515 | |
| 1516 an = (ngx_resolver_an_t *) &buf[i + 2]; | |
| 1517 | |
| 1518 len = (an->len_hi << 8) + an->len_lo; | |
| 1519 | |
| 1520 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
|
1521 "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
|
1522 (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
|
1523 (an->class_hi << 8) + an->class_lo, len); |
| 1649 | 1524 |
| 1525 i += 2 + sizeof(ngx_resolver_an_t); | |
| 1526 | |
| 1527 if (i + len > (ngx_uint_t) n) { | |
| 1528 goto short_response; | |
| 1529 } | |
| 1530 | |
| 1531 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) { | |
| 1532 return; | |
| 1533 } | |
| 1534 | |
| 1535 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name); | |
| 1536 | |
|
2486
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1537 if (name.len != (size_t) rn->nlen |
|
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1538 || ngx_strncmp(name.data, rn->name, name.len) != 0) |
| 1649 | 1539 { |
|
2482
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1540 if (rn->nlen) { |
|
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1541 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
|
1542 } |
|
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1543 |
|
2490
1c87647b7ca5
fix building by msvc, introduced in r2487
Igor Sysoev <igor@sysoev.ru>
parents:
2487
diff
changeset
|
1544 rn->nlen = (u_short) name.len; |
| 1649 | 1545 rn->name = name.data; |
| 1546 | |
|
2486
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1547 name.data = ngx_resolver_dup(r, rn->name, name.len); |
| 1649 | 1548 if (name.data == NULL) { |
| 1549 goto failed; | |
| 1550 } | |
| 1551 } | |
| 1552 | |
| 1553 ngx_queue_remove(&rn->queue); | |
| 1554 | |
| 1555 rn->valid = ngx_time() + r->valid; | |
| 1556 rn->expire = ngx_time() + r->expire; | |
| 1557 | |
| 1558 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
| 1559 | |
| 1560 next = rn->waiting; | |
| 1561 rn->waiting = NULL; | |
| 1562 | |
| 1563 /* unlock addr mutex */ | |
| 1564 | |
| 1565 while (next) { | |
| 1566 ctx = next; | |
| 1567 ctx->state = NGX_OK; | |
| 1568 ctx->name = name; | |
| 1569 next = ctx->next; | |
| 1570 | |
| 1571 ctx->handler(ctx); | |
| 1572 } | |
| 1573 | |
| 1574 ngx_resolver_free(r, name.data); | |
| 1575 | |
| 1576 return; | |
| 1577 | |
| 1578 invalid_in_addr_arpa: | |
| 1579 | |
| 1580 ngx_log_error(r->log_level, r->log, 0, | |
| 1581 "invalid in-addr.arpa name in DNS response"); | |
| 1582 return; | |
| 1583 | |
| 1584 short_response: | |
| 1585 | |
| 1586 err = "short DNS response"; | |
| 1587 | |
| 1588 invalid: | |
| 1589 | |
| 1590 /* unlock addr mutex */ | |
| 1591 | |
| 1592 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1593 | |
| 1594 return; | |
| 1595 | |
| 1596 failed: | |
| 1597 | |
| 1598 /* unlock addr mutex */ | |
| 1599 | |
| 1600 return; | |
| 1601 } | |
| 1602 | |
| 1603 | |
| 1604 static ngx_resolver_node_t * | |
| 1605 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) | |
| 1606 { | |
| 1607 ngx_int_t rc; | |
| 1608 ngx_rbtree_node_t *node, *sentinel; | |
| 1609 ngx_resolver_node_t *rn; | |
| 1610 | |
| 1611 node = r->name_rbtree.root; | |
| 1612 sentinel = r->name_rbtree.sentinel; | |
| 1613 | |
| 1614 while (node != sentinel) { | |
| 1615 | |
| 1616 if (hash < node->key) { | |
| 1617 node = node->left; | |
| 1618 continue; | |
| 1619 } | |
| 1620 | |
| 1621 if (hash > node->key) { | |
| 1622 node = node->right; | |
| 1623 continue; | |
| 1624 } | |
| 1625 | |
| 1626 /* hash == node->key */ | |
| 1627 | |
| 1628 do { | |
| 1629 rn = (ngx_resolver_node_t *) node; | |
| 1630 | |
|
3143
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fix resolver cache rbtree comparison
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3139
diff
changeset
|
1631 rc = ngx_memn2cmp(name->data, rn->name, name->len, rn->nlen); |
| 1649 | 1632 |
| 1633 if (rc == 0) { | |
| 1634 return rn; | |
| 1635 } | |
| 1636 | |
| 1637 node = (rc < 0) ? node->left : node->right; | |
| 1638 | |
| 1639 } while (node != sentinel && hash == node->key); | |
| 1640 | |
| 1641 break; | |
| 1642 } | |
| 1643 | |
| 1644 /* not found */ | |
| 1645 | |
| 1646 return NULL; | |
| 1647 } | |
| 1648 | |
| 1649 | |
| 1650 static ngx_resolver_node_t * | |
| 1651 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr) | |
| 1652 { | |
| 1653 ngx_rbtree_node_t *node, *sentinel; | |
| 1654 | |
| 1655 node = r->addr_rbtree.root; | |
| 1656 sentinel = r->addr_rbtree.sentinel; | |
| 1657 | |
| 1658 while (node != sentinel) { | |
| 1659 | |
| 1660 if (addr < node->key) { | |
| 1661 node = node->left; | |
| 1662 continue; | |
| 1663 } | |
| 1664 | |
| 1665 if (addr > node->key) { | |
| 1666 node = node->right; | |
| 1667 continue; | |
| 1668 } | |
| 1669 | |
| 1670 /* addr == node->key */ | |
| 1671 | |
| 1672 return (ngx_resolver_node_t *) node; | |
| 1673 } | |
| 1674 | |
| 1675 /* not found */ | |
| 1676 | |
| 1677 return NULL; | |
| 1678 } | |
| 1679 | |
| 1680 | |
| 1681 static void | |
| 1682 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
| 1683 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
| 1684 { | |
| 1685 ngx_rbtree_node_t **p; | |
| 1686 ngx_resolver_node_t *rn, *rn_temp; | |
| 1687 | |
| 1688 for ( ;; ) { | |
| 1689 | |
| 1690 if (node->key < temp->key) { | |
| 1691 | |
| 1692 p = &temp->left; | |
| 1693 | |
| 1694 } else if (node->key > temp->key) { | |
| 1695 | |
| 1696 p = &temp->right; | |
| 1697 | |
| 1698 } else { /* node->key == temp->key */ | |
| 1699 | |
| 1700 rn = (ngx_resolver_node_t *) node; | |
| 1701 rn_temp = (ngx_resolver_node_t *) temp; | |
| 1702 | |
|
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changeset
|
1703 p = (ngx_memn2cmp(rn->name, rn_temp->name, rn->nlen, rn_temp->nlen) |
|
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diff
changeset
|
1704 < 0) ? &temp->left : &temp->right; |
| 1649 | 1705 } |
| 1706 | |
| 1707 if (*p == sentinel) { | |
| 1708 break; | |
| 1709 } | |
| 1710 | |
| 1711 temp = *p; | |
| 1712 } | |
| 1713 | |
| 1714 *p = node; | |
| 1715 node->parent = temp; | |
| 1716 node->left = sentinel; | |
| 1717 node->right = sentinel; | |
| 1718 ngx_rbt_red(node); | |
| 1719 } | |
| 1720 | |
| 1721 | |
| 1722 static ngx_int_t | |
| 1723 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1724 { | |
| 1725 u_char *p, *s; | |
|
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changeset
|
1726 size_t len, nlen; |
| 1649 | 1727 ngx_uint_t ident; |
| 1728 ngx_resolver_qs_t *qs; | |
| 1729 ngx_resolver_query_t *query; | |
| 1730 | |
|
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diff
changeset
|
1731 nlen = ctx->name.len ? (1 + ctx->name.len + 1) : 1; |
|
61bdaac6c668
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diff
changeset
|
1732 |
|
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diff
changeset
|
1733 len = sizeof(ngx_resolver_query_t) + nlen + sizeof(ngx_resolver_qs_t); |
| 1649 | 1734 |
|
3307
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diff
changeset
|
1735 p = ngx_resolver_alloc(ctx->resolver, len); |
| 1649 | 1736 if (p == NULL) { |
| 1737 return NGX_ERROR; | |
| 1738 } | |
| 1739 | |
| 1740 rn->qlen = (u_short) len; | |
| 1741 rn->query = p; | |
| 1742 | |
| 1743 query = (ngx_resolver_query_t *) p; | |
| 1744 | |
| 1745 ident = ngx_random(); | |
| 1746 | |
| 1747 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0, | |
| 1748 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff); | |
| 1749 | |
| 1750 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1751 query->ident_lo = (u_char) (ident & 0xff); | |
| 1752 | |
| 1753 /* recursion query */ | |
| 1754 query->flags_hi = 1; query->flags_lo = 0; | |
| 1755 | |
| 1756 /* one question */ | |
| 1757 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1758 query->nan_hi = 0; query->nan_lo = 0; | |
| 1759 query->nns_hi = 0; query->nns_lo = 0; | |
| 1760 query->nar_hi = 0; query->nar_lo = 0; | |
| 1761 | |
|
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|
1762 p += sizeof(ngx_resolver_query_t) + nlen; |
| 1649 | 1763 |
| 1764 qs = (ngx_resolver_qs_t *) p; | |
| 1765 | |
| 1766 /* query type */ | |
| 1767 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type; | |
| 1768 | |
| 1769 /* IP query class */ | |
| 1770 qs->class_hi = 0; qs->class_lo = 1; | |
| 1771 | |
| 1772 /* convert "www.example.com" to "\3www\7example\3com\0" */ | |
| 1773 | |
| 1774 len = 0; | |
| 1775 p--; | |
| 1776 *p-- = '\0'; | |
| 1777 | |
| 1778 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) { | |
| 1779 if (*s != '.') { | |
| 1780 *p = *s; | |
| 1781 len++; | |
| 1782 | |
| 1783 } else { | |
|
1961
99b9feacccb4
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1960
diff
changeset
|
1784 if (len == 0) { |
|
99b9feacccb4
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parents:
1960
diff
changeset
|
1785 return NGX_DECLINED; |
|
99b9feacccb4
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parents:
1960
diff
changeset
|
1786 } |
|
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diff
changeset
|
1787 |
| 1649 | 1788 *p = (u_char) len; |
| 1789 len = 0; | |
| 1790 } | |
| 1791 | |
| 1792 p--; | |
| 1793 } | |
| 1794 | |
| 1795 *p = (u_char) len; | |
| 1796 | |
| 1797 return NGX_OK; | |
| 1798 } | |
| 1799 | |
| 1800 | |
| 1801 /* AF_INET only */ | |
| 1802 | |
| 1803 static ngx_int_t | |
| 1804 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1805 { | |
| 1806 u_char *p, *d; | |
| 1807 size_t len; | |
| 1808 ngx_int_t n; | |
| 1809 ngx_uint_t ident; | |
| 1810 ngx_resolver_query_t *query; | |
| 1811 | |
| 1812 len = sizeof(ngx_resolver_query_t) | |
| 1813 + sizeof(".255.255.255.255.in-addr.arpa.") - 1 | |
| 1814 + sizeof(ngx_resolver_qs_t); | |
| 1815 | |
|
3307
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diff
changeset
|
1816 p = ngx_resolver_alloc(ctx->resolver, len); |
| 1649 | 1817 if (p == NULL) { |
| 1818 return NGX_ERROR; | |
| 1819 } | |
| 1820 | |
| 1821 rn->query = p; | |
| 1822 query = (ngx_resolver_query_t *) p; | |
| 1823 | |
| 1824 ident = ngx_random(); | |
| 1825 | |
| 1826 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1827 query->ident_lo = (u_char) (ident & 0xff); | |
| 1828 | |
| 1829 /* recursion query */ | |
| 1830 query->flags_hi = 1; query->flags_lo = 0; | |
| 1831 | |
| 1832 /* one question */ | |
| 1833 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1834 query->nan_hi = 0; query->nan_lo = 0; | |
| 1835 query->nns_hi = 0; query->nns_lo = 0; | |
| 1836 query->nar_hi = 0; query->nar_lo = 0; | |
| 1837 | |
| 1838 p += sizeof(ngx_resolver_query_t); | |
| 1839 | |
| 3642 | 1840 for (n = 0; n < 32; n += 8) { |
| 1649 | 1841 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff); |
| 1842 *p = (u_char) (d - &p[1]); | |
| 1843 p = d; | |
| 1844 } | |
| 1845 | |
| 1846 /* query type "PTR", IP query class */ | |
| 1847 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18); | |
| 1848 | |
| 1849 rn->qlen = (u_short) | |
| 1850 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t) | |
| 1851 - rn->query); | |
| 1852 | |
| 1853 return NGX_OK; | |
| 1854 } | |
| 1855 | |
| 1856 | |
| 1857 static ngx_int_t | |
| 1858 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src, | |
| 1859 u_char *last) | |
| 1860 { | |
| 1861 char *err; | |
| 1862 u_char *p, *dst; | |
| 1863 ssize_t len; | |
| 1864 ngx_uint_t i, n; | |
| 1865 | |
| 1866 p = src; | |
| 1867 len = -1; | |
| 1868 | |
| 1869 /* | |
| 1870 * compression pointers allow to create endless loop, so we set limit; | |
| 1871 * 128 pointers should be enough to store 255-byte name | |
| 1872 */ | |
| 1873 | |
| 1874 for (i = 0; i < 128; i++) { | |
| 1875 n = *p++; | |
| 1876 | |
| 1877 if (n == 0) { | |
| 1878 goto done; | |
| 1879 } | |
| 1880 | |
| 1881 if (n & 0xc0) { | |
|
2314
52987a023486
fix compression pointer for big (>255) DNS responses
Igor Sysoev <igor@sysoev.ru>
parents:
2282
diff
changeset
|
1882 n = ((n & 0x3f) << 8) + *p; |
| 1649 | 1883 p = &buf[n]; |
| 1884 | |
| 1885 } else { | |
| 1886 len += 1 + n; | |
| 1887 p = &p[n]; | |
| 1888 } | |
| 1889 | |
| 1890 if (p >= last) { | |
| 1891 err = "name is out of response"; | |
| 1892 goto invalid; | |
| 1893 } | |
| 1894 } | |
| 1895 | |
| 1896 err = "compression pointers loop"; | |
| 1897 | |
| 1898 invalid: | |
| 1899 | |
| 1900 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1901 | |
| 1902 return NGX_ERROR; | |
| 1903 | |
| 1904 done: | |
| 1905 | |
| 1906 if (name == NULL) { | |
| 583 | 1907 return NGX_OK; |
| 1908 } | |
| 1909 | |
|
3298
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fix "PTR ." case in address resolver
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3297
diff
changeset
|
1910 if (len == -1) { |
|
847ab5a32307
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diff
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|
1911 name->len = 0; |
|
847ab5a32307
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diff
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|
1912 name->data = NULL; |
|
847ab5a32307
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diff
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|
1913 return NGX_OK; |
|
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|
1914 } |
|
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|
1915 |
| 1649 | 1916 dst = ngx_resolver_alloc(r, len); |
| 1917 if (dst == NULL) { | |
| 1918 return NGX_ERROR; | |
| 1919 } | |
| 1920 | |
| 1921 name->data = dst; | |
| 1922 | |
| 1923 n = *src++; | |
| 1924 | |
| 1925 for ( ;; ) { | |
| 4287 | 1926 if (n & 0xc0) { |
| 1927 n = ((n & 0x3f) << 8) + *src; | |
| 1928 src = &buf[n]; | |
| 1929 | |
| 1930 n = *src++; | |
| 1931 | |
| 1932 } else { | |
| 1649 | 1933 ngx_memcpy(dst, src, n); |
| 1934 dst += n; | |
| 1935 src += n; | |
| 1936 | |
| 1937 n = *src++; | |
| 1938 | |
| 1939 if (n != 0) { | |
| 1940 *dst++ = '.'; | |
| 1941 } | |
| 1942 } | |
| 1943 | |
| 1944 if (n == 0) { | |
| 1945 name->len = dst - name->data; | |
| 1946 return NGX_OK; | |
| 1947 } | |
| 1948 } | |
| 1949 } | |
| 1950 | |
| 1951 | |
| 1952 static void | |
| 1953 ngx_resolver_timeout_handler(ngx_event_t *ev) | |
| 1954 { | |
| 1955 ngx_resolver_ctx_t *ctx; | |
| 1956 | |
| 1957 ctx = ev->data; | |
| 1958 | |
| 1959 ctx->state = NGX_RESOLVE_TIMEDOUT; | |
| 1960 | |
| 1961 ctx->handler(ctx); | |
| 1962 } | |
| 1963 | |
| 1964 | |
| 1965 static void | |
| 1966 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 1967 { | |
| 1968 /* lock alloc mutex */ | |
| 1969 | |
| 1970 if (rn->query) { | |
| 1971 ngx_resolver_free_locked(r, rn->query); | |
| 1972 } | |
| 1973 | |
| 1974 if (rn->name) { | |
| 1975 ngx_resolver_free_locked(r, rn->name); | |
| 1976 } | |
| 1977 | |
| 1978 if (rn->cnlen) { | |
| 1979 ngx_resolver_free_locked(r, rn->u.cname); | |
| 1980 } | |
| 1981 | |
| 1982 if (rn->naddrs > 1) { | |
| 1983 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 1984 } | |
| 1985 | |
| 1986 ngx_resolver_free_locked(r, rn); | |
| 1987 | |
| 1988 /* unlock alloc mutex */ | |
| 1989 } | |
| 1990 | |
| 1991 | |
| 1992 static void * | |
| 1993 ngx_resolver_alloc(ngx_resolver_t *r, size_t size) | |
| 1994 { | |
| 1995 u_char *p; | |
| 1996 | |
| 1997 /* lock alloc mutex */ | |
| 1998 | |
| 1999 p = ngx_alloc(size, r->log); | |
| 2000 | |
| 2001 /* unlock alloc mutex */ | |
| 2002 | |
| 2003 return p; | |
| 2004 } | |
| 2005 | |
| 2006 | |
| 1903 | 2007 static void * |
| 1649 | 2008 ngx_resolver_calloc(ngx_resolver_t *r, size_t size) |
| 2009 { | |
| 2010 u_char *p; | |
| 2011 | |
| 2012 p = ngx_resolver_alloc(r, size); | |
| 2013 | |
| 2014 if (p) { | |
| 2015 ngx_memzero(p, size); | |
| 2016 } | |
| 2017 | |
| 2018 return p; | |
| 2019 } | |
| 2020 | |
| 2021 | |
| 2022 static void | |
| 2023 ngx_resolver_free(ngx_resolver_t *r, void *p) | |
| 2024 { | |
| 2025 /* lock alloc mutex */ | |
| 2026 | |
| 2027 ngx_free(p); | |
| 2028 | |
| 2029 /* unlock alloc mutex */ | |
| 2030 } | |
| 2031 | |
| 2032 | |
| 2033 static void | |
| 2034 ngx_resolver_free_locked(ngx_resolver_t *r, void *p) | |
| 2035 { | |
| 2036 ngx_free(p); | |
| 2037 } | |
| 2038 | |
| 2039 | |
| 2040 static void * | |
| 2041 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size) | |
| 2042 { | |
| 2043 void *dst; | |
| 2044 | |
| 2045 dst = ngx_resolver_alloc(r, size); | |
| 2046 | |
| 2047 if (dst == NULL) { | |
| 2048 return dst; | |
| 2049 } | |
| 2050 | |
| 2051 ngx_memcpy(dst, src, size); | |
| 2052 | |
| 2053 return dst; | |
| 2054 } | |
| 2055 | |
| 2056 | |
| 2057 char * | |
| 2058 ngx_resolver_strerror(ngx_int_t err) | |
| 2059 { | |
| 2060 static char *errors[] = { | |
| 2061 "Format error", /* FORMERR */ | |
| 2062 "Server failure", /* SERVFAIL */ | |
| 2063 "Host not found", /* NXDOMAIN */ | |
| 2064 "Unimplemented", /* NOTIMP */ | |
| 2065 "Operation refused" /* REFUSED */ | |
| 2066 }; | |
| 2067 | |
| 2068 if (err > 0 && err < 6) { | |
| 2069 return errors[err - 1]; | |
| 2070 } | |
| 2071 | |
| 2072 if (err == NGX_RESOLVE_TIMEDOUT) { | |
| 2073 return "Operation timed out"; | |
| 2074 } | |
| 2075 | |
| 2076 return "Unknown error"; | |
| 2077 } | |
| 2078 | |
| 2079 | |
|
3408
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3376
diff
changeset
|
2080 static u_char * |
|
71193a456616
add context to a resolver log
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3376
diff
changeset
|
2081 ngx_resolver_log_error(ngx_log_t *log, u_char *buf, size_t len) |
|
71193a456616
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parents:
3376
diff
changeset
|
2082 { |
|
71193a456616
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parents:
3376
diff
changeset
|
2083 u_char *p; |
|
71193a456616
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parents:
3376
diff
changeset
|
2084 ngx_udp_connection_t *uc; |
|
71193a456616
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parents:
3376
diff
changeset
|
2085 |
|
71193a456616
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Igor Sysoev <igor@sysoev.ru>
parents:
3376
diff
changeset
|
2086 p = buf; |
|
71193a456616
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parents:
3376
diff
changeset
|
2087 |
|
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parents:
3376
diff
changeset
|
2088 if (log->action) { |
|
71193a456616
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3376
diff
changeset
|
2089 p = ngx_snprintf(buf, len, " while %s", log->action); |
|
71193a456616
add context to a resolver log
Igor Sysoev <igor@sysoev.ru>
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diff
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|
2090 len -= p - buf; |
|
71193a456616
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|
2091 } |
|
71193a456616
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|
2092 |
|
71193a456616
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diff
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|
2093 uc = log->data; |
|
71193a456616
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3376
diff
changeset
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2094 |
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2095 if (uc) { |
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2096 p = ngx_snprintf(p, len, ", resolver: %V", &uc->server); |
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2097 } |
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2098 |
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2099 return p; |
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2100 } |
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2101 |
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2102 |
| 1649 | 2103 ngx_int_t |
| 2104 ngx_udp_connect(ngx_udp_connection_t *uc) | |
| 2105 { | |
| 2106 int rc; | |
| 2107 ngx_int_t event; | |
| 2108 ngx_event_t *rev, *wev; | |
| 2109 ngx_socket_t s; | |
| 2110 ngx_connection_t *c; | |
| 2111 | |
| 583 | 2112 s = ngx_socket(AF_INET, SOCK_DGRAM, 0); |
| 2113 | |
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2114 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, &uc->log, 0, "UDP socket %d", s); |
| 583 | 2115 |
| 2116 if (s == -1) { | |
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2117 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
| 583 | 2118 ngx_socket_n " failed"); |
| 2119 return NGX_ERROR; | |
| 2120 } | |
| 2121 | |
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2122 c = ngx_get_connection(s, &uc->log); |
| 583 | 2123 |
| 2124 if (c == NULL) { | |
| 2125 if (ngx_close_socket(s) == -1) { | |
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2126 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
| 583 | 2127 ngx_close_socket_n "failed"); |
| 2128 } | |
| 2129 | |
| 2130 return NGX_ERROR; | |
| 2131 } | |
| 2132 | |
| 1649 | 2133 if (ngx_nonblocking(s) == -1) { |
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2134 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
| 1649 | 2135 ngx_nonblocking_n " failed"); |
| 2136 | |
| 2137 ngx_free_connection(c); | |
| 2138 | |
| 2139 if (ngx_close_socket(s) == -1) { | |
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2140 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
| 1649 | 2141 ngx_close_socket_n " failed"); |
| 2142 } | |
| 2143 | |
| 2144 return NGX_ERROR; | |
| 2145 } | |
| 2146 | |
| 583 | 2147 rev = c->read; |
| 2148 wev = c->write; | |
| 2149 | |
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2150 rev->log = &uc->log; |
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2151 wev->log = &uc->log; |
| 1649 | 2152 |
| 2153 uc->connection = c; | |
| 583 | 2154 |
| 2155 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); | |
| 2156 | |
| 2157 #if (NGX_THREADS) | |
| 1649 | 2158 |
| 2159 /* TODO: lock event when call completion handler */ | |
| 2160 | |
| 2161 rev->lock = &c->lock; | |
| 2162 wev->lock = &c->lock; | |
| 583 | 2163 rev->own_lock = &c->lock; |
| 2164 wev->own_lock = &c->lock; | |
| 1649 | 2165 |
| 583 | 2166 #endif |
| 2167 | |
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2168 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, &uc->log, 0, |
| 1649 | 2169 "connect to %V, fd:%d #%d", &uc->server, s, c->number); |
| 2170 | |
| 2171 rc = connect(s, uc->sockaddr, uc->socklen); | |
| 2172 | |
| 2173 /* TODO: aio, iocp */ | |
| 583 | 2174 |
| 2175 if (rc == -1) { | |
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2176 ngx_log_error(NGX_LOG_CRIT, &uc->log, ngx_socket_errno, |
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2177 "connect() failed"); |
| 583 | 2178 |
| 2179 return NGX_ERROR; | |
| 2180 } | |
| 2181 | |
| 1649 | 2182 /* UDP sockets are always ready to write */ |
| 2183 wev->ready = 1; | |
| 2184 | |
| 2185 if (ngx_add_event) { | |
| 2186 | |
| 2187 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ? | |
| 2188 /* kqueue, epoll */ NGX_CLEAR_EVENT: | |
| 2189 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT; | |
| 2190 /* eventport event type has no meaning: oneshot only */ | |
| 2191 | |
| 2192 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { | |
| 2193 return NGX_ERROR; | |
| 2194 } | |
| 2195 | |
| 2196 } else { | |
| 2197 /* rtsig */ | |
| 2198 | |
| 583 | 2199 if (ngx_add_conn(c) == NGX_ERROR) { |
| 2200 return NGX_ERROR; | |
| 2201 } | |
| 2202 } | |
| 2203 | |
| 2204 return NGX_OK; | |
| 2205 } |