Mercurial > hg > nginx
annotate src/core/ngx_resolver.c @ 2281:5004229420a6
FORMERR DNS response may be equal to mininal query size
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Fri, 24 Oct 2008 14:34:10 +0000 |
| parents | b52cb9bf2064 |
| children | ec97eb9a8038 |
| rev | line source |
|---|---|
| 583 | 1 |
| 2 /* | |
| 3 * Copyright (C) Igor Sysoev | |
| 4 */ | |
| 5 | |
| 6 | |
| 7 #include <ngx_config.h> | |
| 8 #include <ngx_core.h> | |
| 9 #include <ngx_event.h> | |
| 10 | |
| 11 | |
| 1649 | 12 #define NGX_RESOLVER_UDP_SIZE 4096 |
| 13 | |
| 14 | |
| 583 | 15 typedef struct { |
| 1649 | 16 u_char ident_hi; |
| 17 u_char ident_lo; | |
| 18 u_char flags_hi; | |
| 19 u_char flags_lo; | |
| 20 u_char nqs_hi; | |
| 21 u_char nqs_lo; | |
| 22 u_char nan_hi; | |
| 23 u_char nan_lo; | |
| 24 u_char nns_hi; | |
| 25 u_char nns_lo; | |
| 26 u_char nar_hi; | |
| 27 u_char nar_lo; | |
| 28 } ngx_resolver_query_t; | |
| 29 | |
| 30 | |
| 31 typedef struct { | |
| 32 u_char type_hi; | |
| 33 u_char type_lo; | |
| 34 u_char class_hi; | |
| 35 u_char class_lo; | |
| 36 } ngx_resolver_qs_t; | |
| 37 | |
| 38 | |
| 39 typedef struct { | |
| 40 u_char type_hi; | |
| 41 u_char type_lo; | |
| 42 u_char class_hi; | |
| 43 u_char class_lo; | |
| 44 u_char ttl[4]; | |
| 45 u_char len_hi; | |
| 46 u_char len_lo; | |
| 47 } ngx_resolver_an_t; | |
| 48 | |
| 49 | |
| 50 ngx_int_t ngx_udp_connect(ngx_udp_connection_t *uc); | |
| 51 | |
| 52 | |
| 1906 | 53 static void ngx_resolver_cleanup(void *data); |
| 54 static void ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree); | |
| 1649 | 55 static ngx_int_t ngx_resolve_name_locked(ngx_resolver_t *r, |
| 56 ngx_resolver_ctx_t *ctx); | |
| 57 static void ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
| 58 ngx_queue_t *queue); | |
| 59 static ngx_int_t ngx_resolver_send_query(ngx_resolver_t *r, | |
| 60 ngx_resolver_node_t *rn); | |
| 61 static ngx_int_t ngx_resolver_create_name_query(ngx_resolver_node_t *rn, | |
| 62 ngx_resolver_ctx_t *ctx); | |
| 63 static ngx_int_t ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, | |
| 64 ngx_resolver_ctx_t *ctx); | |
| 65 static void ngx_resolver_resend_handler(ngx_event_t *ev); | |
| 66 static time_t ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
| 67 ngx_queue_t *queue); | |
| 68 static void ngx_resolver_read_response(ngx_event_t *rev); | |
| 69 static void ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, | |
| 70 size_t n); | |
| 71 static void ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t n, | |
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72 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans); |
| 1649 | 73 static void ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, |
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74 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan); |
| 1649 | 75 static ngx_resolver_node_t *ngx_resolver_lookup_name(ngx_resolver_t *r, |
| 76 ngx_str_t *name, uint32_t hash); | |
| 77 static ngx_resolver_node_t *ngx_resolver_lookup_addr(ngx_resolver_t *r, | |
| 78 in_addr_t addr); | |
| 79 static void ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
| 80 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel); | |
| 81 static ngx_int_t ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, | |
| 82 u_char *buf, u_char *src, u_char *last); | |
| 83 static void ngx_resolver_timeout_handler(ngx_event_t *ev); | |
| 84 static void ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn); | |
| 85 static void *ngx_resolver_alloc(ngx_resolver_t *r, size_t size); | |
| 1903 | 86 static void *ngx_resolver_calloc(ngx_resolver_t *r, size_t size); |
| 1649 | 87 static void ngx_resolver_free(ngx_resolver_t *r, void *p); |
| 88 static void ngx_resolver_free_locked(ngx_resolver_t *r, void *p); | |
| 89 static void *ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size); | |
| 90 | |
| 91 | |
| 92 /* STUB: ngx_peer_addr_t * */ | |
| 93 | |
| 94 ngx_resolver_t * | |
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95 ngx_resolver_create(ngx_conf_t *cf, ngx_peer_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; |
| 1649 | 142 r->log_level = NGX_LOG_ALERT; |
| 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; |
| 1914 | 155 uc->log = cf->cycle->new_log; |
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156 } |
| 1649 | 157 |
| 158 return r; | |
| 159 } | |
| 160 | |
| 161 | |
| 1906 | 162 static void |
| 163 ngx_resolver_cleanup(void *data) | |
| 164 { | |
| 165 ngx_resolver_t *r = data; | |
| 166 | |
| 167 if (r) { | |
| 168 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, | |
| 169 "cleanup resolver"); | |
| 170 | |
| 171 ngx_resolver_cleanup_tree(r, &r->name_rbtree); | |
| 172 | |
| 173 ngx_resolver_cleanup_tree(r, &r->addr_rbtree); | |
| 174 | |
| 175 if (r->event) { | |
| 176 ngx_free(r->event); | |
| 177 } | |
| 178 | |
| 179 if (r->udp_connection) { | |
| 180 if (r->udp_connection->connection) { | |
| 181 ngx_close_connection(r->udp_connection->connection); | |
| 182 } | |
| 183 | |
| 184 ngx_free(r->udp_connection); | |
| 185 } | |
| 186 | |
| 187 ngx_free(r); | |
| 188 } | |
| 189 } | |
| 190 | |
| 191 | |
| 192 static void | |
| 193 ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree) | |
| 194 { | |
| 195 ngx_resolver_ctx_t *ctx, *next; | |
| 196 ngx_resolver_node_t *rn; | |
| 197 | |
| 198 while (tree->root != tree->sentinel) { | |
| 199 | |
| 200 rn = (ngx_resolver_node_t *) ngx_rbtree_min(tree->root, tree->sentinel); | |
| 201 | |
| 202 ngx_queue_remove(&rn->queue); | |
| 203 | |
| 204 for (ctx = rn->waiting; ctx; ctx = next) { | |
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205 next = ctx->next; |
| 1906 | 206 |
| 207 if (ctx->event) { | |
| 208 ngx_resolver_free(r, ctx->event); | |
| 209 } | |
| 210 | |
| 211 ngx_resolver_free(r, ctx); | |
| 212 } | |
| 213 | |
| 214 ngx_rbtree_delete(tree, &rn->node); | |
| 215 | |
| 216 ngx_resolver_free_node(r, rn); | |
| 217 } | |
| 218 } | |
| 219 | |
| 220 | |
| 1649 | 221 ngx_resolver_ctx_t * |
| 222 ngx_resolve_start(ngx_resolver_t *r, ngx_resolver_ctx_t *temp) | |
| 223 { | |
| 224 in_addr_t addr; | |
| 225 ngx_resolver_ctx_t *ctx; | |
| 226 | |
| 227 if (temp) { | |
| 228 addr = ngx_inet_addr(temp->name.data, temp->name.len); | |
| 229 | |
| 230 if (addr != INADDR_NONE) { | |
| 231 temp->resolver = r; | |
| 232 temp->state = NGX_OK; | |
| 233 temp->naddrs = 1; | |
| 234 temp->addrs = &temp->addr; | |
| 235 temp->addr = addr; | |
| 236 temp->quick = 1; | |
| 237 | |
| 238 return temp; | |
| 239 } | |
| 240 } | |
| 241 | |
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242 if (r->udp_connection == NULL) { |
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243 return NGX_NO_RESOLVER; |
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244 } |
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245 |
| 1649 | 246 ctx = ngx_resolver_calloc(r, sizeof(ngx_resolver_ctx_t)); |
| 247 | |
| 248 if (ctx) { | |
| 249 ctx->resolver = r; | |
| 250 } | |
| 251 | |
| 252 return ctx; | |
| 253 } | |
| 254 | |
| 255 | |
| 256 ngx_int_t | |
| 257 ngx_resolve_name(ngx_resolver_ctx_t *ctx) | |
| 258 { | |
| 259 ngx_int_t rc; | |
| 260 ngx_resolver_t *r; | |
| 261 | |
| 262 r = ctx->resolver; | |
| 263 | |
| 264 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 265 "resolve: \"%V\"", &ctx->name); | |
| 266 | |
| 267 if (ctx->quick) { | |
| 268 ctx->handler(ctx); | |
| 269 return NGX_OK; | |
| 270 } | |
| 271 | |
| 272 /* lock name mutex */ | |
| 273 | |
| 274 rc = ngx_resolve_name_locked(r, ctx); | |
| 275 | |
| 276 if (rc == NGX_OK) { | |
| 277 return NGX_OK; | |
| 278 } | |
| 279 | |
| 280 /* unlock name mutex */ | |
| 281 | |
| 282 if (rc == NGX_AGAIN) { | |
| 283 return NGX_OK; | |
| 284 } | |
| 285 | |
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286 /* NGX_ERROR */ |
| 1649 | 287 |
| 288 if (ctx->event) { | |
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289 ngx_resolver_free(r, ctx->event); |
| 1649 | 290 } |
| 291 | |
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292 ngx_resolver_free(r, ctx); |
| 1649 | 293 |
| 294 return NGX_ERROR; | |
| 295 } | |
| 296 | |
| 297 | |
| 298 void | |
| 299 ngx_resolve_name_done(ngx_resolver_ctx_t *ctx) | |
| 300 { | |
| 301 uint32_t hash; | |
| 302 ngx_resolver_t *r; | |
| 303 ngx_resolver_ctx_t *w, **p; | |
| 304 ngx_resolver_node_t *rn; | |
| 305 | |
| 306 r = ctx->resolver; | |
| 307 | |
| 308 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 309 "resolve name done: %i", ctx->state); | |
| 310 | |
| 311 if (ctx->quick) { | |
| 312 return; | |
| 313 } | |
| 314 | |
| 315 if (ctx->event && ctx->event->timer_set) { | |
| 316 ngx_del_timer(ctx->event); | |
| 317 } | |
| 318 | |
| 319 /* lock name mutex */ | |
| 320 | |
| 321 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
| 322 | |
| 323 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
| 324 | |
| 325 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
| 326 | |
| 327 if (rn) { | |
| 328 p = &rn->waiting; | |
| 329 w = rn->waiting; | |
| 330 | |
| 331 while (w) { | |
| 332 if (w == ctx) { | |
| 333 *p = w->next; | |
| 334 | |
| 335 goto done; | |
| 336 } | |
| 337 | |
| 338 p = &w->next; | |
| 339 w = w->next; | |
| 340 } | |
| 341 } | |
| 342 | |
| 343 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
| 344 "could not cancel %V resolving", &ctx->name); | |
| 345 } | |
| 346 | |
| 347 done: | |
| 348 | |
| 349 ngx_resolver_expire(r, &r->name_rbtree, &r->name_expire_queue); | |
| 350 | |
| 351 /* unlock name mutex */ | |
| 352 | |
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353 /* lock alloc mutex */ |
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354 |
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355 if (ctx->event) { |
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356 ngx_resolver_free_locked(r, ctx->event); |
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357 } |
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358 |
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359 ngx_resolver_free_locked(r, ctx); |
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360 |
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361 /* unlock alloc mutex */ |
| 1649 | 362 } |
| 363 | |
| 364 | |
| 365 /* NGX_RESOLVE_A only */ | |
| 366 | |
| 367 static ngx_int_t | |
| 368 ngx_resolve_name_locked(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx) | |
| 369 { | |
| 370 uint32_t hash; | |
| 371 in_addr_t addr, *addrs; | |
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372 ngx_int_t rc; |
| 1649 | 373 ngx_uint_t naddrs; |
| 374 ngx_resolver_ctx_t *next; | |
| 375 ngx_resolver_node_t *rn; | |
| 376 | |
| 377 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
| 378 | |
| 379 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
| 380 | |
| 381 if (rn) { | |
| 382 | |
| 383 if (rn->valid >= ngx_time()) { | |
| 384 | |
| 385 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
| 386 | |
| 387 ngx_queue_remove(&rn->queue); | |
| 388 | |
| 389 rn->expire = ngx_time() + r->expire; | |
| 390 | |
| 391 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 392 | |
| 393 naddrs = rn->naddrs; | |
| 394 | |
| 395 if (naddrs) { | |
| 396 | |
| 397 /* NGX_RESOLVE_A answer */ | |
| 398 | |
| 399 if (naddrs != 1) { | |
| 400 addr = 0; | |
| 401 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
| 402 naddrs * sizeof(in_addr_t)); | |
| 403 if (addrs == NULL) { | |
| 404 return NGX_ERROR; | |
| 405 } | |
| 406 | |
| 407 } else { | |
| 408 addr = rn->u.addr; | |
| 409 addrs = NULL; | |
| 410 } | |
| 411 | |
| 412 ctx->next = rn->waiting; | |
| 413 rn->waiting = NULL; | |
| 414 | |
| 415 /* unlock name mutex */ | |
| 416 | |
| 417 do { | |
| 418 ctx->state = NGX_OK; | |
| 419 ctx->naddrs = naddrs; | |
| 420 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 421 ctx->addr = addr; | |
| 422 next = ctx->next; | |
| 423 | |
| 424 ctx->handler(ctx); | |
| 425 | |
| 426 ctx = next; | |
| 427 } while (ctx); | |
| 428 | |
| 429 if (addrs) { | |
| 430 ngx_resolver_free(r, addrs); | |
| 431 } | |
| 432 | |
| 433 return NGX_OK; | |
| 434 } | |
| 435 | |
| 436 /* NGX_RESOLVE_CNAME */ | |
| 437 | |
| 1969 | 438 if (ctx->recursion++ < NGX_RESOLVER_MAX_RECURSION) { |
| 439 | |
| 440 ctx->name.len = rn->cnlen; | |
| 441 ctx->name.data = rn->u.cname; | |
| 442 | |
| 443 return ngx_resolve_name_locked(r, ctx); | |
| 444 } | |
| 445 | |
| 446 ctx->next = rn->waiting; | |
| 447 rn->waiting = NULL; | |
| 448 | |
| 449 /* unlock name mutex */ | |
| 450 | |
| 451 do { | |
| 452 ctx->state = NGX_RESOLVE_NXDOMAIN; | |
| 453 next = ctx->next; | |
| 454 | |
| 455 ctx->handler(ctx); | |
| 456 | |
| 457 ctx = next; | |
| 458 } while (ctx); | |
| 459 | |
| 460 return NGX_OK; | |
| 1649 | 461 } |
| 462 | |
| 463 if (rn->waiting) { | |
| 464 | |
| 465 ctx->next = rn->waiting; | |
| 466 rn->waiting = ctx; | |
| 467 | |
| 468 return NGX_AGAIN; | |
| 469 } | |
| 470 | |
| 471 ngx_queue_remove(&rn->queue); | |
| 472 | |
| 473 /* lock alloc mutex */ | |
| 474 | |
| 475 ngx_resolver_free_locked(r, rn->query); | |
|
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diff
changeset
|
476 rn->query = NULL; |
| 1649 | 477 |
| 478 if (rn->cnlen) { | |
| 479 ngx_resolver_free_locked(r, rn->u.cname); | |
| 480 } | |
| 481 | |
| 482 if (rn->naddrs > 1) { | |
| 483 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 484 } | |
| 485 | |
| 486 /* unlock alloc mutex */ | |
| 487 | |
| 488 } else { | |
| 489 | |
| 490 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
| 491 if (rn == NULL) { | |
| 492 return NGX_ERROR; | |
| 493 } | |
| 494 | |
| 495 rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len); | |
| 496 if (rn->name == NULL) { | |
| 497 ngx_resolver_free(r, rn); | |
| 498 return NGX_ERROR; | |
| 499 } | |
| 500 | |
| 501 rn->node.key = hash; | |
| 502 rn->nlen = (u_short) ctx->name.len; | |
|
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diff
changeset
|
503 rn->query = NULL; |
| 1649 | 504 |
| 505 ngx_rbtree_insert(&r->name_rbtree, &rn->node); | |
| 506 } | |
| 507 | |
|
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
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diff
changeset
|
508 rc = ngx_resolver_create_name_query(rn, ctx); |
|
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diff
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|
509 |
|
99b9feacccb4
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diff
changeset
|
510 if (rc == NGX_ERROR) { |
| 1649 | 511 goto failed; |
| 512 } | |
| 513 | |
|
1961
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return NXDOMAIN for ".." in host name
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diff
changeset
|
514 if (rc == NGX_DECLINED) { |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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diff
changeset
|
515 ngx_rbtree_delete(&r->name_rbtree, &rn->node); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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diff
changeset
|
516 |
|
99b9feacccb4
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|
517 ngx_resolver_free(r, rn->query); |
|
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diff
changeset
|
518 ngx_resolver_free(r, rn->name); |
|
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return NXDOMAIN for ".." in host name
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1960
diff
changeset
|
519 ngx_resolver_free(r, rn); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
520 |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
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1960
diff
changeset
|
521 ctx->state = NGX_RESOLVE_NXDOMAIN; |
|
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diff
changeset
|
522 ctx->handler(ctx); |
|
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return NXDOMAIN for ".." in host name
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1960
diff
changeset
|
523 |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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1960
diff
changeset
|
524 return NGX_OK; |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
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1960
diff
changeset
|
525 } |
|
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return NXDOMAIN for ".." in host name
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1960
diff
changeset
|
526 |
| 1649 | 527 if (ngx_resolver_send_query(r, rn) != NGX_OK) { |
| 528 goto failed; | |
| 529 } | |
| 530 | |
| 531 if (ctx->event == NULL) { | |
| 532 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
| 533 if (ctx->event == NULL) { | |
| 534 goto failed; | |
| 535 } | |
| 536 | |
| 537 ctx->event->handler = ngx_resolver_timeout_handler; | |
| 538 ctx->event->data = ctx; | |
| 539 ctx->event->log = r->log; | |
| 540 ctx->ident = -1; | |
| 541 | |
| 542 ngx_add_timer(ctx->event, ctx->timeout); | |
| 543 } | |
| 544 | |
| 545 if (ngx_queue_empty(&r->name_resend_queue)) { | |
| 546 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
| 547 } | |
| 548 | |
| 549 rn->expire = ngx_time() + r->resend_timeout; | |
| 550 | |
| 551 ngx_queue_insert_head(&r->name_resend_queue, &rn->queue); | |
| 552 | |
| 553 rn->cnlen = 0; | |
| 554 rn->naddrs = 0; | |
| 555 rn->valid = 0; | |
| 556 rn->waiting = ctx; | |
| 557 | |
| 558 ctx->state = NGX_AGAIN; | |
| 559 | |
| 560 return NGX_AGAIN; | |
| 561 | |
| 562 failed: | |
| 563 | |
| 564 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 565 | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
566 if (rn->query) { |
|
1609b3c3d604
fix memory leak on resolver query send failure
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parents:
1914
diff
changeset
|
567 ngx_resolver_free(r, rn->query); |
|
1609b3c3d604
fix memory leak on resolver query send failure
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1914
diff
changeset
|
568 } |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
569 |
| 1649 | 570 ngx_resolver_free(r, rn->name); |
| 571 | |
| 572 ngx_resolver_free(r, rn); | |
| 573 | |
| 574 return NGX_ERROR; | |
| 575 } | |
| 583 | 576 |
| 577 | |
| 578 ngx_int_t | |
| 1649 | 579 ngx_resolve_addr(ngx_resolver_ctx_t *ctx) |
| 580 { | |
| 581 ngx_resolver_t *r; | |
| 582 ngx_resolver_node_t *rn; | |
| 583 | |
| 584 r = ctx->resolver; | |
| 585 | |
| 586 ctx->addr = ntohl(ctx->addr); | |
| 587 | |
| 588 /* lock addr mutex */ | |
| 589 | |
| 590 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
| 591 | |
| 592 if (rn) { | |
| 593 | |
| 594 if (rn->valid >= ngx_time()) { | |
| 595 | |
| 596 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
| 597 | |
| 598 ngx_queue_remove(&rn->queue); | |
| 599 | |
| 600 rn->expire = ngx_time() + r->expire; | |
| 601 | |
| 602 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
| 603 | |
| 604 ctx->name.len = rn->nlen; | |
| 605 ctx->name.data = ngx_resolver_dup(r, rn->name, rn->nlen); | |
| 606 if (ctx->name.data == NULL) { | |
| 607 goto failed; | |
| 608 } | |
| 609 | |
| 610 /* unlock addr mutex */ | |
| 611 | |
| 612 ctx->state = NGX_OK; | |
| 613 | |
| 614 ctx->handler(ctx); | |
| 615 | |
| 616 ngx_resolver_free(r, ctx->name.data); | |
| 617 | |
| 618 return NGX_OK; | |
| 619 } | |
| 620 | |
| 621 if (rn->waiting) { | |
| 622 | |
| 623 ctx->next = rn->waiting; | |
| 624 rn->waiting = ctx; | |
| 625 | |
| 626 return NGX_AGAIN; | |
| 627 } | |
| 628 | |
| 629 ngx_queue_remove(&rn->queue); | |
| 630 | |
| 631 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
|
632 rn->query = NULL; |
| 1649 | 633 |
| 634 } else { | |
| 635 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
| 636 if (rn == NULL) { | |
| 637 goto failed; | |
| 638 } | |
| 639 | |
| 640 rn->node.key = ctx->addr; | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
641 rn->query = NULL; |
| 1649 | 642 |
| 643 ngx_rbtree_insert(&r->addr_rbtree, &rn->node); | |
| 644 } | |
| 645 | |
| 646 if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) { | |
| 647 goto failed; | |
| 648 } | |
| 649 | |
| 650 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
| 651 goto failed; | |
| 652 } | |
| 653 | |
| 654 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
| 655 if (ctx->event == NULL) { | |
| 656 goto failed; | |
| 657 } | |
| 658 | |
| 659 ctx->event->handler = ngx_resolver_timeout_handler; | |
| 660 ctx->event->data = ctx; | |
| 661 ctx->event->log = r->log; | |
| 662 ctx->ident = -1; | |
| 663 | |
| 664 ngx_add_timer(ctx->event, ctx->timeout); | |
| 665 | |
| 666 if (ngx_queue_empty(&r->addr_resend_queue)) { | |
| 667 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
| 668 } | |
| 669 | |
| 670 rn->expire = ngx_time() + r->resend_timeout; | |
| 671 | |
| 672 ngx_queue_insert_head(&r->addr_resend_queue, &rn->queue); | |
| 673 | |
| 674 rn->cnlen = 0; | |
| 675 rn->naddrs = 0; | |
| 676 rn->name = NULL; | |
| 677 rn->nlen = 0; | |
| 678 rn->valid = 0; | |
| 679 rn->waiting = ctx; | |
| 680 | |
| 681 /* unlock addr mutex */ | |
| 682 | |
| 683 ctx->state = NGX_AGAIN; | |
| 684 | |
| 685 return NGX_OK; | |
| 686 | |
| 687 failed: | |
| 688 | |
| 689 if (rn) { | |
| 690 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 691 | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
692 if (rn->query) { |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
693 ngx_resolver_free(r, rn->query); |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
694 } |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
695 |
| 1649 | 696 ngx_resolver_free(r, rn); |
| 697 } | |
| 698 | |
| 699 /* unlock addr mutex */ | |
| 700 | |
| 701 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
|
702 ngx_resolver_free(r, ctx->event); |
| 1649 | 703 } |
| 704 | |
|
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
705 ngx_resolver_free(r, ctx); |
| 1649 | 706 |
| 707 return NGX_ERROR; | |
| 708 } | |
| 709 | |
| 710 | |
| 711 void | |
| 712 ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx) | |
| 713 { | |
| 714 in_addr_t addr; | |
| 715 ngx_resolver_t *r; | |
| 716 ngx_resolver_ctx_t *w, **p; | |
| 717 ngx_resolver_node_t *rn; | |
| 718 | |
| 719 r = ctx->resolver; | |
| 720 | |
| 721 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 722 "resolve addr done: %i", ctx->state); | |
| 723 | |
| 724 if (ctx->event && ctx->event->timer_set) { | |
| 725 ngx_del_timer(ctx->event); | |
| 726 } | |
| 727 | |
| 728 /* lock addr mutex */ | |
| 729 | |
| 730 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
| 731 | |
| 732 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
| 733 | |
| 734 if (rn) { | |
| 735 p = &rn->waiting; | |
| 736 w = rn->waiting; | |
| 737 | |
| 738 while (w) { | |
| 739 if (w == ctx) { | |
| 740 *p = w->next; | |
| 741 | |
| 742 goto done; | |
| 743 } | |
| 744 | |
| 745 p = &w->next; | |
| 746 w = w->next; | |
| 747 } | |
| 748 } | |
| 749 | |
| 750 addr = ntohl(ctx->addr); | |
| 751 | |
| 752 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
| 753 "could not cancel %ud.%ud.%ud.%ud resolving", | |
| 754 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 755 (addr >> 8) & 0xff, addr & 0xff); | |
| 756 } | |
| 757 | |
| 758 done: | |
| 759 | |
| 760 ngx_resolver_expire(r, &r->addr_rbtree, &r->addr_expire_queue); | |
| 761 | |
| 762 /* unlock addr mutex */ | |
| 763 | |
|
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
764 /* 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
|
765 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
766 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
|
767 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
|
768 } |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
769 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
770 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
|
771 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
772 /* unlock alloc mutex */ |
| 1649 | 773 } |
| 774 | |
| 775 | |
| 776 static void | |
| 777 ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 778 { | |
| 779 time_t now; | |
| 780 ngx_uint_t i; | |
| 781 ngx_queue_t *q; | |
| 782 ngx_resolver_node_t *rn; | |
| 783 | |
| 784 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire"); | |
| 785 | |
| 786 now = ngx_time(); | |
| 787 | |
| 788 for (i = 0; i < 2; i++) { | |
| 789 if (ngx_queue_empty(queue)) { | |
| 790 return; | |
| 791 } | |
| 792 | |
| 793 q = ngx_queue_last(queue); | |
| 794 | |
| 795 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 796 | |
| 797 if (now <= rn->expire) { | |
| 798 return; | |
| 799 } | |
| 800 | |
| 1774 | 801 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, |
| 802 "resolver expire \"%*s\"", (size_t) rn->nlen, rn->name); | |
| 1649 | 803 |
| 804 ngx_queue_remove(q); | |
| 805 | |
| 806 ngx_rbtree_delete(tree, &rn->node); | |
| 807 | |
| 808 ngx_resolver_free_node(r, rn); | |
| 809 } | |
| 810 } | |
| 811 | |
| 812 | |
| 813 static ngx_int_t | |
| 814 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 815 { | |
| 816 ssize_t n; | |
| 817 ngx_udp_connection_t *uc; | |
| 818 | |
| 819 uc = r->udp_connection; | |
| 820 | |
| 821 if (uc->connection == NULL) { | |
| 822 if (ngx_udp_connect(uc) != NGX_OK) { | |
| 823 return NGX_ERROR; | |
| 824 } | |
| 825 | |
| 826 uc->connection->data = r; | |
| 827 uc->connection->read->handler = ngx_resolver_read_response; | |
| 1906 | 828 uc->connection->read->resolver = 1; |
| 1649 | 829 } |
| 830 | |
| 831 n = ngx_send(uc->connection, rn->query, rn->qlen); | |
| 832 | |
| 833 if (n == -1) { | |
| 834 return NGX_ERROR; | |
| 835 } | |
| 836 | |
| 837 if ((size_t) n != (size_t) rn->qlen) { | |
| 838 ngx_log_error(NGX_LOG_CRIT, uc->log, 0, "send() incomplete"); | |
| 839 return NGX_ERROR; | |
| 840 } | |
| 841 | |
| 842 return NGX_OK; | |
| 843 } | |
| 844 | |
| 845 | |
| 846 static void | |
| 847 ngx_resolver_resend_handler(ngx_event_t *ev) | |
| 848 { | |
| 849 time_t timer, atimer, ntimer; | |
| 850 ngx_resolver_t *r; | |
| 851 | |
| 852 r = ev->data; | |
| 853 | |
| 854 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 855 "resolver resend handler"); | |
| 856 | |
| 857 /* lock name mutex */ | |
| 858 | |
| 859 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue); | |
| 860 | |
| 861 /* unlock name mutex */ | |
| 862 | |
| 863 /* lock addr mutex */ | |
| 864 | |
| 865 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
|
866 |
| 1649 | 867 /* unlock addr mutex */ |
| 868 | |
| 869 if (ntimer == 0) { | |
| 870 timer = atimer; | |
| 871 | |
| 872 } else if (atimer == 0) { | |
| 873 timer = ntimer; | |
| 874 | |
| 875 } else { | |
| 876 timer = (atimer < ntimer) ? atimer : ntimer; | |
| 877 } | |
| 878 | |
| 879 if (timer) { | |
| 880 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000)); | |
| 881 } | |
| 882 } | |
| 883 | |
| 884 | |
| 885 static time_t | |
| 886 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 887 { | |
| 888 time_t now; | |
| 889 ngx_queue_t *q; | |
| 890 ngx_resolver_node_t *rn; | |
| 891 | |
| 892 now = ngx_time(); | |
| 893 | |
| 894 for ( ;; ) { | |
| 895 if (ngx_queue_empty(queue)) { | |
| 896 return 0; | |
| 897 } | |
| 898 | |
| 899 q = ngx_queue_last(queue); | |
| 900 | |
| 901 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 902 | |
| 903 if (now < rn->expire) { | |
| 904 return rn->expire - now; | |
| 905 } | |
| 906 | |
| 1774 | 907 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, |
| 908 "resolver resend \"%*s\" %p", | |
| 909 (size_t) rn->nlen, rn->name, rn->waiting); | |
| 1649 | 910 |
| 911 ngx_queue_remove(q); | |
| 912 | |
| 913 if (rn->waiting) { | |
| 914 | |
| 915 if (ngx_resolver_send_query(r, rn) == NGX_OK) { | |
| 916 | |
| 917 rn->expire = now + r->resend_timeout; | |
| 918 | |
| 919 ngx_queue_insert_head(queue, &rn->queue); | |
| 920 } | |
|
1879
cf4ee321d195
do not delete failed DNS request if there are waiting clients
Igor Sysoev <igor@sysoev.ru>
parents:
1878
diff
changeset
|
921 |
|
cf4ee321d195
do not delete failed DNS request if there are waiting clients
Igor Sysoev <igor@sysoev.ru>
parents:
1878
diff
changeset
|
922 continue; |
| 1649 | 923 } |
| 924 | |
| 925 ngx_rbtree_delete(tree, &rn->node); | |
| 926 | |
| 927 ngx_resolver_free_node(r, rn); | |
| 928 } | |
| 929 } | |
| 930 | |
| 931 | |
| 932 static void | |
| 933 ngx_resolver_read_response(ngx_event_t *rev) | |
| 934 { | |
| 935 ssize_t n; | |
| 936 ngx_connection_t *c; | |
| 937 u_char buf[NGX_RESOLVER_UDP_SIZE]; | |
| 938 | |
| 939 c = rev->data; | |
| 940 | |
| 941 do { | |
| 1689 | 942 n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE); |
| 943 | |
| 944 if (n < 0) { | |
| 1649 | 945 return; |
| 946 } | |
| 947 | |
| 948 ngx_resolver_process_response(c->data, buf, n); | |
| 949 | |
| 950 } while (rev->ready); | |
| 951 } | |
| 952 | |
| 953 | |
| 954 static void | |
| 955 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n) | |
| 956 { | |
| 957 char *err; | |
| 958 size_t len; | |
| 959 ngx_uint_t i, ident, flags, code, nqs, nan, qtype, qclass; | |
| 960 ngx_resolver_qs_t *qs; | |
| 961 ngx_resolver_query_t *query; | |
| 962 | |
|
2281
5004229420a6
FORMERR DNS response may be equal to mininal query size
Igor Sysoev <igor@sysoev.ru>
parents:
2006
diff
changeset
|
963 if ((size_t) n < sizeof(ngx_resolver_query_t)) { |
| 1649 | 964 goto short_response; |
| 965 } | |
| 966 | |
| 967 query = (ngx_resolver_query_t *) buf; | |
| 968 | |
| 969 ident = (query->ident_hi << 8) + query->ident_lo; | |
| 970 flags = (query->flags_hi << 8) + query->flags_lo; | |
| 971 nqs = (query->nqs_hi << 8) + query->nqs_lo; | |
| 972 nan = (query->nan_hi << 8) + query->nan_lo; | |
| 973 | |
| 974 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
|
975 "resolver DNS response %ui fl:%04Xui %ui/%ui/%ui/%ui", |
| 1649 | 976 ident, flags, nqs, nan, |
| 977 (query->nns_hi << 8) + query->nns_lo, | |
| 978 (query->nar_hi << 8) + query->nar_lo); | |
| 979 | |
| 980 if (!(flags & 0x8000)) { | |
| 981 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
|
982 "invalid DNS response %ui fl:%04Xui", ident, flags); |
| 1649 | 983 return; |
| 984 } | |
| 985 | |
| 986 code = flags & 0x7f; | |
| 987 | |
| 988 if (code == NGX_RESOLVE_FORMERR || code > NGX_RESOLVE_REFUSED) { | |
| 989 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
|
990 "DNS error (%ui: %s), query id:%ui", |
| 1649 | 991 code, ngx_resolver_strerror(code), ident); |
| 992 return; | |
| 993 } | |
| 994 | |
| 995 if (nqs != 1) { | |
| 996 err = "invalid number of questions in DNS response"; | |
| 997 goto done; | |
| 998 } | |
| 999 | |
| 1000 i = sizeof(ngx_resolver_query_t); | |
| 1001 | |
| 1002 while (i < (ngx_uint_t) n) { | |
| 1003 if (buf[i] == '\0') { | |
| 1004 goto found; | |
| 1005 } | |
| 1006 | |
| 1007 len = buf[i]; | |
| 1008 i += 1 + len; | |
| 1009 } | |
| 1010 | |
| 1011 goto short_response; | |
| 1012 | |
| 1013 found: | |
| 1014 | |
| 1015 if (i++ == 0) { | |
| 1016 err = "zero-length domain name in DNS response"; | |
| 1017 goto done; | |
| 1018 } | |
| 1019 | |
| 1020 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t)) | |
| 1021 > (ngx_uint_t) n) | |
| 1022 { | |
| 1023 goto short_response; | |
| 1024 } | |
| 1025 | |
| 1026 qs = (ngx_resolver_qs_t *) &buf[i]; | |
| 1027 | |
| 1028 qtype = (qs->type_hi << 8) + qs->type_lo; | |
| 1029 qclass = (qs->class_hi << 8) + qs->class_lo; | |
| 1030 | |
| 1031 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
|
1032 "resolver DNS response qt:%ui cl:%ui", qtype, qclass); |
| 1649 | 1033 |
| 1034 if (qclass != 1) { | |
| 1035 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
|
1036 "unknown query class %ui in DNS response", qclass); |
| 1649 | 1037 return; |
| 1038 } | |
| 1039 | |
| 1040 switch (qtype) { | |
| 1041 | |
| 1042 case NGX_RESOLVE_A: | |
| 1043 | |
| 1044 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
|
1045 i + sizeof(ngx_resolver_qs_t)); |
| 1649 | 1046 |
| 1047 break; | |
| 1048 | |
| 1049 case NGX_RESOLVE_PTR: | |
| 1050 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1051 ngx_resolver_process_ptr(r, buf, n, ident, code, nan); |
| 1649 | 1052 |
| 1053 break; | |
| 1054 | |
| 1055 default: | |
| 1056 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
|
1057 "unknown query type %ui in DNS response", qtype); |
| 1649 | 1058 return; |
| 1059 } | |
| 1060 | |
| 1061 return; | |
| 1062 | |
| 1063 short_response: | |
| 1064 | |
| 1065 err = "short dns response"; | |
| 1066 | |
| 1067 done: | |
| 1068 | |
| 1069 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1070 | |
| 1071 return; | |
| 1072 } | |
| 1073 | |
| 1074 | |
| 1075 static void | |
| 1076 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last, | |
| 1077 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans) | |
| 583 | 1078 { |
| 1649 | 1079 char *err; |
| 1080 u_char *cname; | |
| 1081 size_t len; | |
| 1082 uint32_t hash; | |
| 1083 in_addr_t addr, *addrs; | |
| 1084 ngx_str_t name; | |
| 1085 ngx_uint_t qtype, qident, naddrs, a, i, n, start; | |
| 1086 ngx_resolver_an_t *an; | |
| 1087 ngx_resolver_ctx_t *ctx, *next; | |
| 1088 ngx_resolver_node_t *rn; | |
| 1089 | |
| 1090 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) { | |
| 1091 return; | |
| 1092 } | |
| 1093 | |
| 1094 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); | |
| 1095 | |
| 1096 hash = ngx_crc32_short(name.data, name.len); | |
| 1097 | |
| 1098 /* lock name mutex */ | |
| 1099 | |
| 1100 rn = ngx_resolver_lookup_name(r, &name, hash); | |
| 1101 | |
| 1102 if (rn == NULL || rn->query == NULL) { | |
| 1103 ngx_log_error(r->log_level, r->log, 0, | |
| 1104 "unexpected response for %V", &name); | |
| 1105 goto failed; | |
| 1106 } | |
| 1107 | |
| 1108 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 1109 | |
| 1110 if (ident != qident) { | |
| 1111 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
|
1112 "wrong ident %ui response for %V, expect %ui", |
| 1649 | 1113 ident, &name, qident); |
| 1114 goto failed; | |
| 1115 } | |
| 1116 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1117 if (code == 0 && nan == 0) { |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1118 code = 3; /* NXDOMAIN */ |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1119 } |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1120 |
| 1649 | 1121 if (code) { |
| 1122 next = rn->waiting; | |
| 1123 rn->waiting = NULL; | |
| 1124 | |
| 1125 ngx_queue_remove(&rn->queue); | |
| 1126 | |
| 1127 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 1128 | |
| 1129 ngx_resolver_free_node(r, rn); | |
| 1130 | |
| 1131 /* unlock name mutex */ | |
| 1132 | |
| 1133 while (next) { | |
| 1134 ctx = next; | |
| 1135 ctx->state = code; | |
| 1136 next = ctx->next; | |
| 1137 | |
| 1138 ctx->handler(ctx); | |
| 1139 } | |
| 1140 | |
| 1141 return; | |
| 1142 } | |
| 1143 | |
| 1144 i = ans; | |
| 1145 naddrs = 0; | |
| 1146 addr = 0; | |
| 1147 addrs = NULL; | |
| 1148 cname = NULL; | |
| 1149 qtype = 0; | |
| 1150 | |
| 1151 for (a = 0; a < nan; a++) { | |
| 1152 | |
| 1153 start = i; | |
| 1154 | |
| 1155 while (i < last) { | |
| 1156 | |
| 1157 if (buf[i] & 0xc0) { | |
| 1158 i += 2; | |
| 1159 goto found; | |
| 1160 } | |
| 1161 | |
| 1162 if (buf[i] == 0) { | |
| 1163 i++; | |
| 1164 goto test_length; | |
| 1165 } | |
| 1166 | |
| 1167 i += 1 + buf[i]; | |
| 1168 } | |
| 1169 | |
| 1170 goto short_response; | |
| 1171 | |
| 1172 test_length: | |
| 1173 | |
| 1174 if (i - start < 2) { | |
| 1175 err = "invalid name in dns response"; | |
| 1176 goto invalid; | |
| 1177 } | |
| 1178 | |
| 1179 found: | |
| 1180 | |
| 1181 if (i + sizeof(ngx_resolver_an_t) >= last) { | |
| 1182 goto short_response; | |
| 1183 } | |
| 1184 | |
| 1185 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1186 | |
| 1187 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1188 len = (an->len_hi << 8) + an->len_lo; | |
| 1189 | |
| 1190 if (qtype == NGX_RESOLVE_A) { | |
| 1191 | |
| 1192 i += sizeof(ngx_resolver_an_t); | |
| 1193 | |
| 1194 if (i + len > last) { | |
| 1195 goto short_response; | |
| 1196 } | |
| 1197 | |
| 1198 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1199 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1200 | |
| 1201 naddrs++; | |
| 1202 | |
| 1203 i += len; | |
| 1204 | |
| 1205 } else if (qtype == NGX_RESOLVE_CNAME) { | |
| 1206 cname = &buf[i] + sizeof(ngx_resolver_an_t); | |
| 1207 i += sizeof(ngx_resolver_an_t) + len; | |
| 1965 | 1208 |
| 1209 } else if (qtype == NGX_RESOLVE_DNAME) { | |
| 1210 i += sizeof(ngx_resolver_an_t) + len; | |
| 1966 | 1211 |
| 1212 } else { | |
| 1213 ngx_log_error(r->log_level, r->log, 0, | |
| 1214 "unexpected qtype %ui", qtype); | |
| 1649 | 1215 } |
| 1216 } | |
| 1217 | |
| 1218 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1219 "resolver naddrs:%ui cname:%p", naddrs, cname); | |
| 1220 | |
| 1221 if (naddrs) { | |
| 1222 | |
| 1223 if (naddrs == 1) { | |
| 1224 rn->u.addr = addr; | |
| 1225 | |
| 1226 } else { | |
| 1227 | |
| 1228 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t)); | |
| 1229 if (addrs == NULL) { | |
| 1230 return; | |
| 1231 } | |
| 1232 | |
| 1233 n = 0; | |
| 1234 i = ans; | |
| 1235 | |
| 1236 for (a = 0; a < nan; a++) { | |
| 1237 | |
| 1238 for ( ;; ) { | |
| 1239 | |
| 1240 if (buf[i] & 0xc0) { | |
| 1241 i += 2; | |
| 1242 goto ok; | |
| 1243 } | |
| 1244 | |
| 1245 if (buf[i] == 0) { | |
| 1246 i++; | |
| 1247 goto ok; | |
| 1248 } | |
| 1249 | |
| 1250 i += 1 + buf[i]; | |
| 1251 } | |
| 1252 | |
| 1253 ok: | |
| 1254 | |
| 1255 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1256 | |
| 1257 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1258 len = (an->len_hi << 8) + an->len_lo; | |
| 1259 | |
| 1260 i += sizeof(ngx_resolver_an_t); | |
| 1261 | |
| 1262 if (qtype == NGX_RESOLVE_A) { | |
| 1263 | |
| 1264 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1265 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1266 | |
| 1267 if (n == naddrs) { | |
| 1268 break; | |
| 1269 } | |
| 1270 } | |
| 1271 | |
| 1272 i += len; | |
| 1273 } | |
| 1274 | |
| 1275 rn->u.addrs = addrs; | |
| 1276 | |
| 1277 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
| 1278 naddrs * sizeof(in_addr_t)); | |
| 1279 if (addrs == NULL) { | |
| 1280 return; | |
| 1281 } | |
| 1282 } | |
| 1283 | |
| 1284 rn->naddrs = (u_short) naddrs; | |
| 1285 | |
| 1286 ngx_queue_remove(&rn->queue); | |
| 1287 | |
| 1288 rn->valid = ngx_time() + r->valid; | |
| 1289 rn->expire = ngx_time() + r->expire; | |
| 1290 | |
| 1291 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1292 | |
| 1293 next = rn->waiting; | |
| 1294 rn->waiting = NULL; | |
| 1295 | |
| 1296 /* unlock name mutex */ | |
| 1297 | |
| 1298 while (next) { | |
| 1299 ctx = next; | |
| 1300 ctx->state = NGX_OK; | |
| 1301 ctx->naddrs = naddrs; | |
| 1302 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 1303 ctx->addr = addr; | |
| 1304 next = ctx->next; | |
| 1305 | |
| 1306 ctx->handler(ctx); | |
| 1307 } | |
| 1308 | |
| 1309 if (naddrs) { | |
| 1310 ngx_resolver_free(r, addrs); | |
| 1311 } | |
| 1312 | |
| 1313 return; | |
| 1314 | |
| 1315 } else if (cname) { | |
| 1316 | |
| 1317 /* CNAME only */ | |
| 1318 | |
| 1319 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) { | |
| 1320 return; | |
| 1321 } | |
| 1322 | |
| 1323 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1324 "resolver cname:\"%V\"", &name); | |
| 1325 | |
|
1741
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1326 ngx_queue_remove(&rn->queue); |
|
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1327 |
| 1649 | 1328 rn->cnlen = (u_short) name.len; |
| 1329 rn->u.cname = name.data; | |
| 1330 rn->valid = ngx_time() + r->valid; | |
| 1331 rn->expire = ngx_time() + r->expire; | |
| 1332 | |
| 1333 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1334 | |
| 1335 ctx = rn->waiting; | |
| 1336 rn->waiting = NULL; | |
| 1337 | |
| 1338 if (ctx) { | |
| 1339 ctx->name = name; | |
| 1340 | |
| 1341 (void) ngx_resolve_name_locked(r, ctx); | |
| 1342 } | |
| 1343 | |
| 1344 return; | |
| 1345 } | |
| 1346 | |
| 1347 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
|
1348 "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
|
1349 qtype); |
| 1649 | 1350 return; |
| 1351 | |
| 1352 short_response: | |
| 1353 | |
| 1354 err = "short dns response"; | |
| 1355 | |
| 1356 invalid: | |
| 1357 | |
| 1358 /* unlock name mutex */ | |
| 1359 | |
| 1360 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1361 | |
| 1362 return; | |
| 1363 | |
| 1364 failed: | |
| 1365 | |
| 1366 /* unlock name mutex */ | |
| 1367 | |
| 1368 return; | |
| 1369 } | |
| 1370 | |
| 1371 | |
| 1372 static void | |
| 1373 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
|
1374 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan) |
| 1649 | 1375 { |
| 1376 char *err; | |
| 1377 size_t len; | |
| 1378 in_addr_t addr; | |
| 1379 ngx_int_t digit; | |
| 1380 ngx_str_t name; | |
| 1381 ngx_uint_t i, mask, qtype, qclass, qident; | |
| 1382 ngx_resolver_an_t *an; | |
| 1383 ngx_resolver_ctx_t *ctx, *next; | |
| 1384 ngx_resolver_node_t *rn; | |
| 1385 | |
| 1386 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) { | |
| 1387 goto invalid_in_addr_arpa; | |
| 1388 } | |
| 1389 | |
| 1390 addr = 0; | |
| 1391 i = 12; | |
| 1392 | |
| 1393 for (mask = 0; mask < 32; mask += 8) { | |
| 1394 len = buf[i++]; | |
| 1395 | |
| 1396 digit = ngx_atoi(&buf[i], len); | |
| 1397 if (digit == NGX_ERROR || digit > 255) { | |
| 1398 goto invalid_in_addr_arpa; | |
| 1399 } | |
| 1400 | |
| 1401 addr += digit << mask; | |
| 1402 i += len; | |
| 1403 } | |
| 1404 | |
| 1405 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) { | |
| 1406 goto invalid_in_addr_arpa; | |
| 1407 } | |
| 1408 | |
| 1409 /* lock addr mutex */ | |
| 1410 | |
| 1411 rn = ngx_resolver_lookup_addr(r, addr); | |
| 1412 | |
| 1413 if (rn == NULL || rn->query == NULL) { | |
| 1414 ngx_log_error(r->log_level, r->log, 0, | |
| 1415 "unexpected response for %ud.%ud.%ud.%ud", | |
| 1416 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 1417 (addr >> 8) & 0xff, addr & 0xff); | |
| 1418 goto failed; | |
| 1419 } | |
| 1420 | |
| 1421 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 1422 | |
| 1423 if (ident != qident) { | |
| 1424 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
|
1425 "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
|
1426 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff, |
|
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1427 (addr >> 8) & 0xff, addr & 0xff, qident); |
| 1649 | 1428 goto failed; |
| 1429 } | |
| 1430 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1431 if (code == 0 && nan == 0) { |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1432 code = 3; /* NXDOMAIN */ |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1433 } |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1434 |
| 1649 | 1435 if (code) { |
| 1436 next = rn->waiting; | |
| 1437 rn->waiting = NULL; | |
| 1438 | |
| 1439 ngx_queue_remove(&rn->queue); | |
| 1440 | |
| 1441 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 1442 | |
| 1443 ngx_resolver_free_node(r, rn); | |
| 1444 | |
| 1445 /* unlock addr mutex */ | |
| 1446 | |
| 1447 while (next) { | |
| 1448 ctx = next; | |
| 1449 ctx->state = code; | |
| 1450 next = ctx->next; | |
| 1451 | |
| 1452 ctx->handler(ctx); | |
| 1453 } | |
| 1454 | |
| 1455 return; | |
| 1456 } | |
| 1457 | |
| 1458 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t); | |
| 1459 | |
| 1460 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) { | |
| 1461 goto short_response; | |
| 1462 } | |
| 1463 | |
| 1464 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */ | |
| 1465 | |
| 1466 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) { | |
| 1467 err = "invalid in-addr.arpa name in DNS response"; | |
| 1468 goto invalid; | |
| 1469 } | |
| 1470 | |
| 1471 an = (ngx_resolver_an_t *) &buf[i + 2]; | |
| 1472 | |
| 1473 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1474 qclass = (an->class_hi << 8) + an->class_lo; | |
| 1475 len = (an->len_hi << 8) + an->len_lo; | |
| 1476 | |
| 1477 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, | |
|
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1478 "resolver qt:%ui cl:%ui len:%uz", qtype, qclass, len); |
| 1649 | 1479 |
| 1480 i += 2 + sizeof(ngx_resolver_an_t); | |
| 1481 | |
| 1482 if (i + len > (ngx_uint_t) n) { | |
| 1483 goto short_response; | |
| 1484 } | |
| 1485 | |
| 1486 len -= 2; | |
| 1487 | |
| 1488 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) { | |
| 1489 return; | |
| 1490 } | |
| 1491 | |
| 1492 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name); | |
| 1493 | |
| 1494 if (len != (size_t) rn->nlen || ngx_strncmp(name.data, rn->name, len) != 0) | |
| 1495 { | |
| 1496 ngx_resolver_free(r, rn->name); | |
| 1497 rn->name = name.data; | |
| 1498 | |
| 1499 name.data = ngx_resolver_dup(r, rn->name, len); | |
| 1500 if (name.data == NULL) { | |
| 1501 goto failed; | |
| 1502 } | |
| 1503 } | |
| 1504 | |
| 1505 ngx_queue_remove(&rn->queue); | |
| 1506 | |
| 1507 rn->valid = ngx_time() + r->valid; | |
| 1508 rn->expire = ngx_time() + r->expire; | |
| 1509 | |
| 1510 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
| 1511 | |
| 1512 next = rn->waiting; | |
| 1513 rn->waiting = NULL; | |
| 1514 | |
| 1515 /* unlock addr mutex */ | |
| 1516 | |
| 1517 while (next) { | |
| 1518 ctx = next; | |
| 1519 ctx->state = NGX_OK; | |
| 1520 ctx->name = name; | |
| 1521 next = ctx->next; | |
| 1522 | |
| 1523 ctx->handler(ctx); | |
| 1524 } | |
| 1525 | |
| 1526 ngx_resolver_free(r, name.data); | |
| 1527 | |
| 1528 return; | |
| 1529 | |
| 1530 invalid_in_addr_arpa: | |
| 1531 | |
| 1532 ngx_log_error(r->log_level, r->log, 0, | |
| 1533 "invalid in-addr.arpa name in DNS response"); | |
| 1534 return; | |
| 1535 | |
| 1536 short_response: | |
| 1537 | |
| 1538 err = "short DNS response"; | |
| 1539 | |
| 1540 invalid: | |
| 1541 | |
| 1542 /* unlock addr mutex */ | |
| 1543 | |
| 1544 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1545 | |
| 1546 return; | |
| 1547 | |
| 1548 failed: | |
| 1549 | |
| 1550 /* unlock addr mutex */ | |
| 1551 | |
| 1552 return; | |
| 1553 } | |
| 1554 | |
| 1555 | |
| 1556 static ngx_resolver_node_t * | |
| 1557 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) | |
| 1558 { | |
| 1559 ngx_int_t rc; | |
| 1560 size_t len; | |
| 1561 ngx_rbtree_node_t *node, *sentinel; | |
| 1562 ngx_resolver_node_t *rn; | |
| 1563 | |
| 1564 node = r->name_rbtree.root; | |
| 1565 sentinel = r->name_rbtree.sentinel; | |
| 1566 | |
| 1567 while (node != sentinel) { | |
| 1568 | |
| 1569 if (hash < node->key) { | |
| 1570 node = node->left; | |
| 1571 continue; | |
| 1572 } | |
| 1573 | |
| 1574 if (hash > node->key) { | |
| 1575 node = node->right; | |
| 1576 continue; | |
| 1577 } | |
| 1578 | |
| 1579 /* hash == node->key */ | |
| 1580 | |
| 1581 do { | |
| 1582 rn = (ngx_resolver_node_t *) node; | |
| 1583 | |
| 1584 len = (name->len > (size_t) rn->nlen) ? rn->nlen : name->len; | |
| 1585 | |
| 1586 rc = ngx_strncmp(name->data, rn->name, len); | |
| 1587 | |
| 1588 if (rc == 0) { | |
| 1589 return rn; | |
| 1590 } | |
| 1591 | |
| 1592 node = (rc < 0) ? node->left : node->right; | |
| 1593 | |
| 1594 } while (node != sentinel && hash == node->key); | |
| 1595 | |
| 1596 break; | |
| 1597 } | |
| 1598 | |
| 1599 /* not found */ | |
| 1600 | |
| 1601 return NULL; | |
| 1602 } | |
| 1603 | |
| 1604 | |
| 1605 static ngx_resolver_node_t * | |
| 1606 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr) | |
| 1607 { | |
| 1608 ngx_rbtree_node_t *node, *sentinel; | |
| 1609 | |
| 1610 node = r->addr_rbtree.root; | |
| 1611 sentinel = r->addr_rbtree.sentinel; | |
| 1612 | |
| 1613 while (node != sentinel) { | |
| 1614 | |
| 1615 if (addr < node->key) { | |
| 1616 node = node->left; | |
| 1617 continue; | |
| 1618 } | |
| 1619 | |
| 1620 if (addr > node->key) { | |
| 1621 node = node->right; | |
| 1622 continue; | |
| 1623 } | |
| 1624 | |
| 1625 /* addr == node->key */ | |
| 1626 | |
| 1627 return (ngx_resolver_node_t *) node; | |
| 1628 } | |
| 1629 | |
| 1630 /* not found */ | |
| 1631 | |
| 1632 return NULL; | |
| 1633 } | |
| 1634 | |
| 1635 | |
| 1636 static void | |
| 1637 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
| 1638 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
| 1639 { | |
| 1640 size_t len; | |
| 1641 ngx_rbtree_node_t **p; | |
| 1642 ngx_resolver_node_t *rn, *rn_temp; | |
| 1643 | |
| 1644 for ( ;; ) { | |
| 1645 | |
| 1646 if (node->key < temp->key) { | |
| 1647 | |
| 1648 p = &temp->left; | |
| 1649 | |
| 1650 } else if (node->key > temp->key) { | |
| 1651 | |
| 1652 p = &temp->right; | |
| 1653 | |
| 1654 } else { /* node->key == temp->key */ | |
| 1655 | |
| 1656 rn = (ngx_resolver_node_t *) node; | |
| 1657 rn_temp = (ngx_resolver_node_t *) temp; | |
| 1658 | |
| 1659 len = (rn->nlen > rn_temp->nlen) ? rn_temp->nlen : rn->nlen; | |
| 1660 | |
| 1661 p = (ngx_strncmp(rn->name, rn_temp->name, len) < 0) | |
| 1662 ? &temp->left : &temp->right; | |
| 1663 } | |
| 1664 | |
| 1665 if (*p == sentinel) { | |
| 1666 break; | |
| 1667 } | |
| 1668 | |
| 1669 temp = *p; | |
| 1670 } | |
| 1671 | |
| 1672 *p = node; | |
| 1673 node->parent = temp; | |
| 1674 node->left = sentinel; | |
| 1675 node->right = sentinel; | |
| 1676 ngx_rbt_red(node); | |
| 1677 } | |
| 1678 | |
| 1679 | |
| 1680 static ngx_int_t | |
| 1681 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1682 { | |
| 1683 u_char *p, *s; | |
| 1684 size_t len; | |
| 1685 ngx_uint_t ident; | |
| 1686 ngx_resolver_qs_t *qs; | |
| 1687 ngx_resolver_query_t *query; | |
| 1688 | |
| 1689 len = sizeof(ngx_resolver_query_t) | |
| 1690 + 1 + ctx->name.len + 1 + sizeof(ngx_resolver_qs_t); | |
| 1691 | |
| 1692 p = ngx_resolver_calloc(ctx->resolver, len); | |
| 1693 if (p == NULL) { | |
| 1694 return NGX_ERROR; | |
| 1695 } | |
| 1696 | |
| 1697 rn->qlen = (u_short) len; | |
| 1698 rn->query = p; | |
| 1699 | |
| 1700 query = (ngx_resolver_query_t *) p; | |
| 1701 | |
| 1702 ident = ngx_random(); | |
| 1703 | |
| 1704 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0, | |
| 1705 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff); | |
| 1706 | |
| 1707 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1708 query->ident_lo = (u_char) (ident & 0xff); | |
| 1709 | |
| 1710 /* recursion query */ | |
| 1711 query->flags_hi = 1; query->flags_lo = 0; | |
| 1712 | |
| 1713 /* one question */ | |
| 1714 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1715 query->nan_hi = 0; query->nan_lo = 0; | |
| 1716 query->nns_hi = 0; query->nns_lo = 0; | |
| 1717 query->nar_hi = 0; query->nar_lo = 0; | |
| 1718 | |
| 1719 p += sizeof(ngx_resolver_query_t) + 1 + ctx->name.len + 1; | |
| 1720 | |
| 1721 qs = (ngx_resolver_qs_t *) p; | |
| 1722 | |
| 1723 /* query type */ | |
| 1724 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type; | |
| 1725 | |
| 1726 /* IP query class */ | |
| 1727 qs->class_hi = 0; qs->class_lo = 1; | |
| 1728 | |
| 1729 /* convert "www.example.com" to "\3www\7example\3com\0" */ | |
| 1730 | |
| 1731 len = 0; | |
| 1732 p--; | |
| 1733 *p-- = '\0'; | |
| 1734 | |
| 1735 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) { | |
| 1736 if (*s != '.') { | |
| 1737 *p = *s; | |
| 1738 len++; | |
| 1739 | |
| 1740 } else { | |
|
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
1741 if (len == 0) { |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
1742 return NGX_DECLINED; |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
1743 } |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
1744 |
| 1649 | 1745 *p = (u_char) len; |
| 1746 len = 0; | |
| 1747 } | |
| 1748 | |
| 1749 p--; | |
| 1750 } | |
| 1751 | |
| 1752 *p = (u_char) len; | |
| 1753 | |
| 1754 return NGX_OK; | |
| 1755 } | |
| 1756 | |
| 1757 | |
| 1758 /* AF_INET only */ | |
| 1759 | |
| 1760 static ngx_int_t | |
| 1761 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1762 { | |
| 1763 u_char *p, *d; | |
| 1764 size_t len; | |
| 1765 ngx_int_t n; | |
| 1766 ngx_uint_t ident; | |
| 1767 ngx_resolver_query_t *query; | |
| 1768 | |
| 1769 len = sizeof(ngx_resolver_query_t) | |
| 1770 + sizeof(".255.255.255.255.in-addr.arpa.") - 1 | |
| 1771 + sizeof(ngx_resolver_qs_t); | |
| 1772 | |
| 1773 p = ngx_resolver_calloc(ctx->resolver, len); | |
| 1774 if (p == NULL) { | |
| 1775 return NGX_ERROR; | |
| 1776 } | |
| 1777 | |
| 1778 rn->query = p; | |
| 1779 query = (ngx_resolver_query_t *) p; | |
| 1780 | |
| 1781 ident = ngx_random(); | |
| 1782 | |
| 1783 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1784 query->ident_lo = (u_char) (ident & 0xff); | |
| 1785 | |
| 1786 /* recursion query */ | |
| 1787 query->flags_hi = 1; query->flags_lo = 0; | |
| 1788 | |
| 1789 /* one question */ | |
| 1790 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1791 query->nan_hi = 0; query->nan_lo = 0; | |
| 1792 query->nns_hi = 0; query->nns_lo = 0; | |
| 1793 query->nar_hi = 0; query->nar_lo = 0; | |
| 1794 | |
| 1795 p += sizeof(ngx_resolver_query_t); | |
| 1796 | |
| 1797 for (n = 0; n < 32; n += 8){ | |
| 1798 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff); | |
| 1799 *p = (u_char) (d - &p[1]); | |
| 1800 p = d; | |
| 1801 } | |
| 1802 | |
| 1803 /* query type "PTR", IP query class */ | |
| 1804 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18); | |
| 1805 | |
| 1806 rn->qlen = (u_short) | |
| 1807 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t) | |
| 1808 - rn->query); | |
| 1809 | |
| 1810 return NGX_OK; | |
| 1811 } | |
| 1812 | |
| 1813 | |
| 1814 static ngx_int_t | |
| 1815 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src, | |
| 1816 u_char *last) | |
| 1817 { | |
| 1818 char *err; | |
| 1819 u_char *p, *dst; | |
| 1820 ssize_t len; | |
| 1821 ngx_uint_t i, n; | |
| 1822 | |
| 1823 p = src; | |
| 1824 len = -1; | |
| 1825 | |
| 1826 /* | |
| 1827 * compression pointers allow to create endless loop, so we set limit; | |
| 1828 * 128 pointers should be enough to store 255-byte name | |
| 1829 */ | |
| 1830 | |
| 1831 for (i = 0; i < 128; i++) { | |
| 1832 n = *p++; | |
| 1833 | |
| 1834 if (n == 0) { | |
| 1835 goto done; | |
| 1836 } | |
| 1837 | |
| 1838 if (n & 0xc0) { | |
| 1839 n = (n & 0x3f << 8) + *p; | |
| 1840 p = &buf[n]; | |
| 1841 | |
| 1842 } else { | |
| 1843 len += 1 + n; | |
| 1844 p = &p[n]; | |
| 1845 } | |
| 1846 | |
| 1847 if (p >= last) { | |
| 1848 err = "name is out of response"; | |
| 1849 goto invalid; | |
| 1850 } | |
| 1851 } | |
| 1852 | |
| 1853 err = "compression pointers loop"; | |
| 1854 | |
| 1855 invalid: | |
| 1856 | |
| 1857 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1858 | |
| 1859 return NGX_ERROR; | |
| 1860 | |
| 1861 done: | |
| 1862 | |
| 1863 if (name == NULL) { | |
| 583 | 1864 return NGX_OK; |
| 1865 } | |
| 1866 | |
| 1649 | 1867 dst = ngx_resolver_alloc(r, len); |
| 1868 if (dst == NULL) { | |
| 1869 return NGX_ERROR; | |
| 1870 } | |
| 1871 | |
| 1872 name->data = dst; | |
| 1873 | |
| 1874 n = *src++; | |
| 1875 | |
| 1876 for ( ;; ) { | |
| 1877 if (n != 0xc0) { | |
| 1878 ngx_memcpy(dst, src, n); | |
| 1879 dst += n; | |
| 1880 src += n; | |
| 1881 | |
| 1882 n = *src++; | |
| 1883 | |
| 1884 if (n != 0) { | |
| 1885 *dst++ = '.'; | |
| 1886 } | |
| 1887 | |
| 1888 } else { | |
| 1889 n = (n & 0x3f << 8) + *src; | |
| 1890 src = &buf[n]; | |
| 1891 | |
| 1892 n = *src++; | |
| 1893 } | |
| 1894 | |
| 1895 if (n == 0) { | |
| 1896 name->len = dst - name->data; | |
| 1897 return NGX_OK; | |
| 1898 } | |
| 1899 } | |
| 1900 } | |
| 1901 | |
| 1902 | |
| 1903 static void | |
| 1904 ngx_resolver_timeout_handler(ngx_event_t *ev) | |
| 1905 { | |
| 1906 ngx_resolver_ctx_t *ctx; | |
| 1907 | |
| 1908 ctx = ev->data; | |
| 1909 | |
| 1910 ctx->state = NGX_RESOLVE_TIMEDOUT; | |
| 1911 | |
| 1912 ctx->handler(ctx); | |
| 1913 } | |
| 1914 | |
| 1915 | |
| 1916 static void | |
| 1917 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 1918 { | |
| 1919 /* lock alloc mutex */ | |
| 1920 | |
| 1921 if (rn->query) { | |
| 1922 ngx_resolver_free_locked(r, rn->query); | |
| 1923 } | |
| 1924 | |
| 1925 if (rn->name) { | |
| 1926 ngx_resolver_free_locked(r, rn->name); | |
| 1927 } | |
| 1928 | |
| 1929 if (rn->cnlen) { | |
| 1930 ngx_resolver_free_locked(r, rn->u.cname); | |
| 1931 } | |
| 1932 | |
| 1933 if (rn->naddrs > 1) { | |
| 1934 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 1935 } | |
| 1936 | |
| 1937 ngx_resolver_free_locked(r, rn); | |
| 1938 | |
| 1939 /* unlock alloc mutex */ | |
| 1940 } | |
| 1941 | |
| 1942 | |
| 1943 static void * | |
| 1944 ngx_resolver_alloc(ngx_resolver_t *r, size_t size) | |
| 1945 { | |
| 1946 u_char *p; | |
| 1947 | |
| 1948 /* lock alloc mutex */ | |
| 1949 | |
| 1950 p = ngx_alloc(size, r->log); | |
| 1951 | |
| 1952 /* unlock alloc mutex */ | |
| 1953 | |
| 1954 return p; | |
| 1955 } | |
| 1956 | |
| 1957 | |
| 1903 | 1958 static void * |
| 1649 | 1959 ngx_resolver_calloc(ngx_resolver_t *r, size_t size) |
| 1960 { | |
| 1961 u_char *p; | |
| 1962 | |
| 1963 p = ngx_resolver_alloc(r, size); | |
| 1964 | |
| 1965 if (p) { | |
| 1966 ngx_memzero(p, size); | |
| 1967 } | |
| 1968 | |
| 1969 return p; | |
| 1970 } | |
| 1971 | |
| 1972 | |
| 1973 static void | |
| 1974 ngx_resolver_free(ngx_resolver_t *r, void *p) | |
| 1975 { | |
| 1976 /* lock alloc mutex */ | |
| 1977 | |
| 1978 ngx_free(p); | |
| 1979 | |
| 1980 /* unlock alloc mutex */ | |
| 1981 } | |
| 1982 | |
| 1983 | |
| 1984 static void | |
| 1985 ngx_resolver_free_locked(ngx_resolver_t *r, void *p) | |
| 1986 { | |
| 1987 ngx_free(p); | |
| 1988 } | |
| 1989 | |
| 1990 | |
| 1991 static void * | |
| 1992 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size) | |
| 1993 { | |
| 1994 void *dst; | |
| 1995 | |
| 1996 dst = ngx_resolver_alloc(r, size); | |
| 1997 | |
| 1998 if (dst == NULL) { | |
| 1999 return dst; | |
| 2000 } | |
| 2001 | |
| 2002 ngx_memcpy(dst, src, size); | |
| 2003 | |
| 2004 return dst; | |
| 2005 } | |
| 2006 | |
| 2007 | |
| 2008 char * | |
| 2009 ngx_resolver_strerror(ngx_int_t err) | |
| 2010 { | |
| 2011 static char *errors[] = { | |
| 2012 "Format error", /* FORMERR */ | |
| 2013 "Server failure", /* SERVFAIL */ | |
| 2014 "Host not found", /* NXDOMAIN */ | |
| 2015 "Unimplemented", /* NOTIMP */ | |
| 2016 "Operation refused" /* REFUSED */ | |
| 2017 }; | |
| 2018 | |
| 2019 if (err > 0 && err < 6) { | |
| 2020 return errors[err - 1]; | |
| 2021 } | |
| 2022 | |
| 2023 if (err == NGX_RESOLVE_TIMEDOUT) { | |
| 2024 return "Operation timed out"; | |
| 2025 } | |
| 2026 | |
| 2027 return "Unknown error"; | |
| 2028 } | |
| 2029 | |
| 2030 | |
| 2031 ngx_int_t | |
| 2032 ngx_udp_connect(ngx_udp_connection_t *uc) | |
| 2033 { | |
| 2034 int rc; | |
| 2035 ngx_int_t event; | |
| 2036 ngx_event_t *rev, *wev; | |
| 2037 ngx_socket_t s; | |
| 2038 ngx_connection_t *c; | |
| 2039 | |
| 583 | 2040 s = ngx_socket(AF_INET, SOCK_DGRAM, 0); |
| 2041 | |
| 1649 | 2042 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, uc->log, 0, "UDP socket %d", s); |
| 583 | 2043 |
| 2044 if (s == -1) { | |
| 1649 | 2045 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
| 583 | 2046 ngx_socket_n " failed"); |
| 2047 return NGX_ERROR; | |
| 2048 } | |
| 2049 | |
| 1649 | 2050 c = ngx_get_connection(s, uc->log); |
| 583 | 2051 |
| 2052 if (c == NULL) { | |
| 2053 if (ngx_close_socket(s) == -1) { | |
| 1649 | 2054 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
| 583 | 2055 ngx_close_socket_n "failed"); |
| 2056 } | |
| 2057 | |
| 2058 return NGX_ERROR; | |
| 2059 } | |
| 2060 | |
| 1649 | 2061 if (ngx_nonblocking(s) == -1) { |
| 2062 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
| 2063 ngx_nonblocking_n " failed"); | |
| 2064 | |
| 2065 ngx_free_connection(c); | |
| 2066 | |
| 2067 if (ngx_close_socket(s) == -1) { | |
| 2068 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
| 2069 ngx_close_socket_n " failed"); | |
| 2070 } | |
| 2071 | |
| 2072 return NGX_ERROR; | |
| 2073 } | |
| 2074 | |
| 583 | 2075 rev = c->read; |
| 2076 wev = c->write; | |
| 2077 | |
| 1649 | 2078 rev->log = uc->log; |
| 2079 wev->log = uc->log; | |
| 2080 | |
| 2081 uc->connection = c; | |
| 583 | 2082 |
| 2083 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); | |
| 2084 | |
| 2085 #if (NGX_THREADS) | |
| 1649 | 2086 |
| 2087 /* TODO: lock event when call completion handler */ | |
| 2088 | |
| 2089 rev->lock = &c->lock; | |
| 2090 wev->lock = &c->lock; | |
| 583 | 2091 rev->own_lock = &c->lock; |
| 2092 wev->own_lock = &c->lock; | |
| 1649 | 2093 |
| 583 | 2094 #endif |
| 2095 | |
| 1649 | 2096 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, uc->log, 0, |
| 2097 "connect to %V, fd:%d #%d", &uc->server, s, c->number); | |
| 2098 | |
| 2099 rc = connect(s, uc->sockaddr, uc->socklen); | |
| 2100 | |
| 2101 /* TODO: aio, iocp */ | |
| 583 | 2102 |
| 2103 if (rc == -1) { | |
| 1649 | 2104 ngx_log_error(NGX_LOG_CRIT, uc->log, ngx_socket_errno, |
| 2105 "connect() to %V failed", &uc->server); | |
| 583 | 2106 |
| 2107 return NGX_ERROR; | |
| 2108 } | |
| 2109 | |
| 1649 | 2110 /* UDP sockets are always ready to write */ |
| 2111 wev->ready = 1; | |
| 2112 | |
| 2113 if (ngx_add_event) { | |
| 2114 | |
| 2115 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ? | |
| 2116 /* kqueue, epoll */ NGX_CLEAR_EVENT: | |
| 2117 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT; | |
| 2118 /* eventport event type has no meaning: oneshot only */ | |
| 2119 | |
| 2120 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { | |
| 2121 return NGX_ERROR; | |
| 2122 } | |
| 2123 | |
| 2124 } else { | |
| 2125 /* rtsig */ | |
| 2126 | |
| 583 | 2127 if (ngx_add_conn(c) == NGX_ERROR) { |
| 2128 return NGX_ERROR; | |
| 2129 } | |
| 2130 } | |
| 2131 | |
| 2132 return NGX_OK; | |
| 2133 } |