Mercurial > hg > nginx
annotate src/core/ngx_resolver.c @ 1960:1609b3c3d604
fix memory leak on resolver query send failure
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Wed, 09 Apr 2008 14:26:08 +0000 |
| parents | d02fb350d17d |
| children | 99b9feacccb4 |
| 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) { | |
| 205 next = ctx->next; | |
| 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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parents:
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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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parents:
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357 } |
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parents:
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358 |
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parents:
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359 ngx_resolver_free_locked(r, ctx); |
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parents:
1903
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360 |
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Igor Sysoev <igor@sysoev.ru>
parents:
1903
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changeset
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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; | |
| 372 ngx_uint_t naddrs; | |
| 373 ngx_resolver_ctx_t *next; | |
| 374 ngx_resolver_node_t *rn; | |
| 375 | |
| 376 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
| 377 | |
| 378 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
| 379 | |
| 380 if (rn) { | |
| 381 | |
| 382 if (rn->valid >= ngx_time()) { | |
| 383 | |
| 384 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
| 385 | |
| 386 ngx_queue_remove(&rn->queue); | |
| 387 | |
| 388 rn->expire = ngx_time() + r->expire; | |
| 389 | |
| 390 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 391 | |
| 392 naddrs = rn->naddrs; | |
| 393 | |
| 394 if (naddrs) { | |
| 395 | |
| 396 /* NGX_RESOLVE_A answer */ | |
| 397 | |
| 398 if (naddrs != 1) { | |
| 399 addr = 0; | |
| 400 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
| 401 naddrs * sizeof(in_addr_t)); | |
| 402 if (addrs == NULL) { | |
| 403 return NGX_ERROR; | |
| 404 } | |
| 405 | |
| 406 } else { | |
| 407 addr = rn->u.addr; | |
| 408 addrs = NULL; | |
| 409 } | |
| 410 | |
| 411 ctx->next = rn->waiting; | |
| 412 rn->waiting = NULL; | |
| 413 | |
| 414 /* unlock name mutex */ | |
| 415 | |
| 416 do { | |
| 417 ctx->state = NGX_OK; | |
| 418 ctx->naddrs = naddrs; | |
| 419 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 420 ctx->addr = addr; | |
| 421 next = ctx->next; | |
| 422 | |
| 423 ctx->handler(ctx); | |
| 424 | |
| 425 ctx = next; | |
| 426 } while (ctx); | |
| 427 | |
| 428 if (addrs) { | |
| 429 ngx_resolver_free(r, addrs); | |
| 430 } | |
| 431 | |
| 432 return NGX_OK; | |
| 433 } | |
| 434 | |
| 435 /* NGX_RESOLVE_CNAME */ | |
| 436 | |
| 437 ctx->name.len = rn->cnlen; | |
| 438 ctx->name.data = rn->u.cname; | |
| 439 | |
| 440 return ngx_resolve_name_locked(r, ctx); | |
| 441 } | |
| 442 | |
| 443 if (rn->waiting) { | |
| 444 | |
| 445 ctx->next = rn->waiting; | |
| 446 rn->waiting = ctx; | |
| 447 | |
| 448 return NGX_AGAIN; | |
| 449 } | |
| 450 | |
| 451 ngx_queue_remove(&rn->queue); | |
| 452 | |
| 453 /* lock alloc mutex */ | |
| 454 | |
| 455 ngx_resolver_free_locked(r, rn->query); | |
|
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diff
changeset
|
456 rn->query = NULL; |
| 1649 | 457 |
| 458 if (rn->cnlen) { | |
| 459 ngx_resolver_free_locked(r, rn->u.cname); | |
| 460 } | |
| 461 | |
| 462 if (rn->naddrs > 1) { | |
| 463 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 464 } | |
| 465 | |
| 466 /* unlock alloc mutex */ | |
| 467 | |
| 468 } else { | |
| 469 | |
| 470 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
| 471 if (rn == NULL) { | |
| 472 return NGX_ERROR; | |
| 473 } | |
| 474 | |
| 475 rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len); | |
| 476 if (rn->name == NULL) { | |
| 477 ngx_resolver_free(r, rn); | |
| 478 return NGX_ERROR; | |
| 479 } | |
| 480 | |
| 481 rn->node.key = hash; | |
| 482 rn->nlen = (u_short) ctx->name.len; | |
|
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diff
changeset
|
483 rn->query = NULL; |
| 1649 | 484 |
| 485 ngx_rbtree_insert(&r->name_rbtree, &rn->node); | |
| 486 } | |
| 487 | |
| 488 if (ngx_resolver_create_name_query(rn, ctx) != NGX_OK) { | |
| 489 goto failed; | |
| 490 } | |
| 491 | |
| 492 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
| 493 goto failed; | |
| 494 } | |
| 495 | |
| 496 if (ctx->event == NULL) { | |
| 497 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
| 498 if (ctx->event == NULL) { | |
| 499 goto failed; | |
| 500 } | |
| 501 | |
| 502 ctx->event->handler = ngx_resolver_timeout_handler; | |
| 503 ctx->event->data = ctx; | |
| 504 ctx->event->log = r->log; | |
| 505 ctx->ident = -1; | |
| 506 | |
| 507 ngx_add_timer(ctx->event, ctx->timeout); | |
| 508 } | |
| 509 | |
| 510 if (ngx_queue_empty(&r->name_resend_queue)) { | |
| 511 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
| 512 } | |
| 513 | |
| 514 rn->expire = ngx_time() + r->resend_timeout; | |
| 515 | |
| 516 ngx_queue_insert_head(&r->name_resend_queue, &rn->queue); | |
| 517 | |
| 518 rn->cnlen = 0; | |
| 519 rn->naddrs = 0; | |
| 520 rn->valid = 0; | |
| 521 rn->waiting = ctx; | |
| 522 | |
| 523 ctx->state = NGX_AGAIN; | |
| 524 | |
| 525 return NGX_AGAIN; | |
| 526 | |
| 527 failed: | |
| 528 | |
| 529 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 530 | |
|
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diff
changeset
|
531 if (rn->query) { |
|
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|
532 ngx_resolver_free(r, rn->query); |
|
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|
533 } |
|
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|
534 |
| 1649 | 535 ngx_resolver_free(r, rn->name); |
| 536 | |
| 537 ngx_resolver_free(r, rn); | |
| 538 | |
| 539 return NGX_ERROR; | |
| 540 } | |
| 583 | 541 |
| 542 | |
| 543 ngx_int_t | |
| 1649 | 544 ngx_resolve_addr(ngx_resolver_ctx_t *ctx) |
| 545 { | |
| 546 ngx_resolver_t *r; | |
| 547 ngx_resolver_node_t *rn; | |
| 548 | |
| 549 r = ctx->resolver; | |
| 550 | |
| 551 ctx->addr = ntohl(ctx->addr); | |
| 552 | |
| 553 /* lock addr mutex */ | |
| 554 | |
| 555 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
| 556 | |
| 557 if (rn) { | |
| 558 | |
| 559 if (rn->valid >= ngx_time()) { | |
| 560 | |
| 561 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
| 562 | |
| 563 ngx_queue_remove(&rn->queue); | |
| 564 | |
| 565 rn->expire = ngx_time() + r->expire; | |
| 566 | |
| 567 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
| 568 | |
| 569 ctx->name.len = rn->nlen; | |
| 570 ctx->name.data = ngx_resolver_dup(r, rn->name, rn->nlen); | |
| 571 if (ctx->name.data == NULL) { | |
| 572 goto failed; | |
| 573 } | |
| 574 | |
| 575 /* unlock addr mutex */ | |
| 576 | |
| 577 ctx->state = NGX_OK; | |
| 578 | |
| 579 ctx->handler(ctx); | |
| 580 | |
| 581 ngx_resolver_free(r, ctx->name.data); | |
| 582 | |
| 583 return NGX_OK; | |
| 584 } | |
| 585 | |
| 586 if (rn->waiting) { | |
| 587 | |
| 588 ctx->next = rn->waiting; | |
| 589 rn->waiting = ctx; | |
| 590 | |
| 591 return NGX_AGAIN; | |
| 592 } | |
| 593 | |
| 594 ngx_queue_remove(&rn->queue); | |
| 595 | |
| 596 ngx_resolver_free(r, rn->query); | |
|
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diff
changeset
|
597 rn->query = NULL; |
| 1649 | 598 |
| 599 } else { | |
| 600 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
| 601 if (rn == NULL) { | |
| 602 goto failed; | |
| 603 } | |
| 604 | |
| 605 rn->node.key = ctx->addr; | |
|
1960
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fix memory leak on resolver query send failure
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1914
diff
changeset
|
606 rn->query = NULL; |
| 1649 | 607 |
| 608 ngx_rbtree_insert(&r->addr_rbtree, &rn->node); | |
| 609 } | |
| 610 | |
| 611 if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) { | |
| 612 goto failed; | |
| 613 } | |
| 614 | |
| 615 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
| 616 goto failed; | |
| 617 } | |
| 618 | |
| 619 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
| 620 if (ctx->event == NULL) { | |
| 621 goto failed; | |
| 622 } | |
| 623 | |
| 624 ctx->event->handler = ngx_resolver_timeout_handler; | |
| 625 ctx->event->data = ctx; | |
| 626 ctx->event->log = r->log; | |
| 627 ctx->ident = -1; | |
| 628 | |
| 629 ngx_add_timer(ctx->event, ctx->timeout); | |
| 630 | |
| 631 if (ngx_queue_empty(&r->addr_resend_queue)) { | |
| 632 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
| 633 } | |
| 634 | |
| 635 rn->expire = ngx_time() + r->resend_timeout; | |
| 636 | |
| 637 ngx_queue_insert_head(&r->addr_resend_queue, &rn->queue); | |
| 638 | |
| 639 rn->cnlen = 0; | |
| 640 rn->naddrs = 0; | |
| 641 rn->name = NULL; | |
| 642 rn->nlen = 0; | |
| 643 rn->valid = 0; | |
| 644 rn->waiting = ctx; | |
| 645 | |
| 646 /* unlock addr mutex */ | |
| 647 | |
| 648 ctx->state = NGX_AGAIN; | |
| 649 | |
| 650 return NGX_OK; | |
| 651 | |
| 652 failed: | |
| 653 | |
| 654 if (rn) { | |
| 655 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 656 | |
|
1960
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fix memory leak on resolver query send failure
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1914
diff
changeset
|
657 if (rn->query) { |
|
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fix memory leak on resolver query send failure
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diff
changeset
|
658 ngx_resolver_free(r, rn->query); |
|
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|
659 } |
|
1609b3c3d604
fix memory leak on resolver query send failure
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changeset
|
660 |
| 1649 | 661 ngx_resolver_free(r, rn); |
| 662 } | |
| 663 | |
| 664 /* unlock addr mutex */ | |
| 665 | |
| 666 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
|
667 ngx_resolver_free(r, ctx->event); |
| 1649 | 668 } |
| 669 | |
|
1904
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fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
670 ngx_resolver_free(r, ctx); |
| 1649 | 671 |
| 672 return NGX_ERROR; | |
| 673 } | |
| 674 | |
| 675 | |
| 676 void | |
| 677 ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx) | |
| 678 { | |
| 679 in_addr_t addr; | |
| 680 ngx_resolver_t *r; | |
| 681 ngx_resolver_ctx_t *w, **p; | |
| 682 ngx_resolver_node_t *rn; | |
| 683 | |
| 684 r = ctx->resolver; | |
| 685 | |
| 686 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 687 "resolve addr done: %i", ctx->state); | |
| 688 | |
| 689 if (ctx->event && ctx->event->timer_set) { | |
| 690 ngx_del_timer(ctx->event); | |
| 691 } | |
| 692 | |
| 693 /* lock addr mutex */ | |
| 694 | |
| 695 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
| 696 | |
| 697 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
| 698 | |
| 699 if (rn) { | |
| 700 p = &rn->waiting; | |
| 701 w = rn->waiting; | |
| 702 | |
| 703 while (w) { | |
| 704 if (w == ctx) { | |
| 705 *p = w->next; | |
| 706 | |
| 707 goto done; | |
| 708 } | |
| 709 | |
| 710 p = &w->next; | |
| 711 w = w->next; | |
| 712 } | |
| 713 } | |
| 714 | |
| 715 addr = ntohl(ctx->addr); | |
| 716 | |
| 717 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
| 718 "could not cancel %ud.%ud.%ud.%ud resolving", | |
| 719 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 720 (addr >> 8) & 0xff, addr & 0xff); | |
| 721 } | |
| 722 | |
| 723 done: | |
| 724 | |
| 725 ngx_resolver_expire(r, &r->addr_rbtree, &r->addr_expire_queue); | |
| 726 | |
| 727 /* unlock addr mutex */ | |
| 728 | |
|
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
729 /* 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
|
730 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
731 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
|
732 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
|
733 } |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
734 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
735 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
|
736 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
737 /* unlock alloc mutex */ |
| 1649 | 738 } |
| 739 | |
| 740 | |
| 741 static void | |
| 742 ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 743 { | |
| 744 time_t now; | |
| 745 ngx_uint_t i; | |
| 746 ngx_queue_t *q; | |
| 747 ngx_resolver_node_t *rn; | |
| 748 | |
| 749 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire"); | |
| 750 | |
| 751 now = ngx_time(); | |
| 752 | |
| 753 for (i = 0; i < 2; i++) { | |
| 754 if (ngx_queue_empty(queue)) { | |
| 755 return; | |
| 756 } | |
| 757 | |
| 758 q = ngx_queue_last(queue); | |
| 759 | |
| 760 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 761 | |
| 762 if (now <= rn->expire) { | |
| 763 return; | |
| 764 } | |
| 765 | |
| 1774 | 766 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, |
| 767 "resolver expire \"%*s\"", (size_t) rn->nlen, rn->name); | |
| 1649 | 768 |
| 769 ngx_queue_remove(q); | |
| 770 | |
| 771 ngx_rbtree_delete(tree, &rn->node); | |
| 772 | |
| 773 ngx_resolver_free_node(r, rn); | |
| 774 } | |
| 775 } | |
| 776 | |
| 777 | |
| 778 static ngx_int_t | |
| 779 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 780 { | |
| 781 ssize_t n; | |
| 782 ngx_udp_connection_t *uc; | |
| 783 | |
| 784 uc = r->udp_connection; | |
| 785 | |
| 786 if (uc->connection == NULL) { | |
| 787 if (ngx_udp_connect(uc) != NGX_OK) { | |
| 788 return NGX_ERROR; | |
| 789 } | |
| 790 | |
| 791 uc->connection->data = r; | |
| 792 uc->connection->read->handler = ngx_resolver_read_response; | |
| 1906 | 793 uc->connection->read->resolver = 1; |
| 1649 | 794 } |
| 795 | |
| 796 n = ngx_send(uc->connection, rn->query, rn->qlen); | |
| 797 | |
| 798 if (n == -1) { | |
| 799 return NGX_ERROR; | |
| 800 } | |
| 801 | |
| 802 if ((size_t) n != (size_t) rn->qlen) { | |
| 803 ngx_log_error(NGX_LOG_CRIT, uc->log, 0, "send() incomplete"); | |
| 804 return NGX_ERROR; | |
| 805 } | |
| 806 | |
| 807 return NGX_OK; | |
| 808 } | |
| 809 | |
| 810 | |
| 811 static void | |
| 812 ngx_resolver_resend_handler(ngx_event_t *ev) | |
| 813 { | |
| 814 time_t timer, atimer, ntimer; | |
| 815 ngx_resolver_t *r; | |
| 816 | |
| 817 r = ev->data; | |
| 818 | |
| 819 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 820 "resolver resend handler"); | |
| 821 | |
| 822 /* lock name mutex */ | |
| 823 | |
| 824 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue); | |
| 825 | |
| 826 /* unlock name mutex */ | |
| 827 | |
| 828 /* lock addr mutex */ | |
| 829 | |
| 830 atimer = ngx_resolver_resend(r, &r->addr_rbtree, &r->addr_resend_queue); | |
|
1679
ca317d9b5c09
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1649
diff
changeset
|
831 |
| 1649 | 832 /* unlock addr mutex */ |
| 833 | |
| 834 if (ntimer == 0) { | |
| 835 timer = atimer; | |
| 836 | |
| 837 } else if (atimer == 0) { | |
| 838 timer = ntimer; | |
| 839 | |
| 840 } else { | |
| 841 timer = (atimer < ntimer) ? atimer : ntimer; | |
| 842 } | |
| 843 | |
| 844 if (timer) { | |
| 845 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000)); | |
| 846 } | |
| 847 } | |
| 848 | |
| 849 | |
| 850 static time_t | |
| 851 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 852 { | |
| 853 time_t now; | |
| 854 ngx_queue_t *q; | |
| 855 ngx_resolver_node_t *rn; | |
| 856 | |
| 857 now = ngx_time(); | |
| 858 | |
| 859 for ( ;; ) { | |
| 860 if (ngx_queue_empty(queue)) { | |
| 861 return 0; | |
| 862 } | |
| 863 | |
| 864 q = ngx_queue_last(queue); | |
| 865 | |
| 866 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 867 | |
| 868 if (now < rn->expire) { | |
| 869 return rn->expire - now; | |
| 870 } | |
| 871 | |
| 1774 | 872 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, |
| 873 "resolver resend \"%*s\" %p", | |
| 874 (size_t) rn->nlen, rn->name, rn->waiting); | |
| 1649 | 875 |
| 876 ngx_queue_remove(q); | |
| 877 | |
| 878 if (rn->waiting) { | |
| 879 | |
| 880 if (ngx_resolver_send_query(r, rn) == NGX_OK) { | |
| 881 | |
| 882 rn->expire = now + r->resend_timeout; | |
| 883 | |
| 884 ngx_queue_insert_head(queue, &rn->queue); | |
| 885 } | |
|
1879
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do not delete failed DNS request if there are waiting clients
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changeset
|
886 |
|
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changeset
|
887 continue; |
| 1649 | 888 } |
| 889 | |
| 890 ngx_rbtree_delete(tree, &rn->node); | |
| 891 | |
| 892 ngx_resolver_free_node(r, rn); | |
| 893 } | |
| 894 } | |
| 895 | |
| 896 | |
| 897 static void | |
| 898 ngx_resolver_read_response(ngx_event_t *rev) | |
| 899 { | |
| 900 ssize_t n; | |
| 901 ngx_connection_t *c; | |
| 902 u_char buf[NGX_RESOLVER_UDP_SIZE]; | |
| 903 | |
| 904 c = rev->data; | |
| 905 | |
| 906 do { | |
| 1689 | 907 n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE); |
| 908 | |
| 909 if (n < 0) { | |
| 1649 | 910 return; |
| 911 } | |
| 912 | |
| 913 ngx_resolver_process_response(c->data, buf, n); | |
| 914 | |
| 915 } while (rev->ready); | |
| 916 } | |
| 917 | |
| 918 | |
| 919 static void | |
| 920 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n) | |
| 921 { | |
| 922 char *err; | |
| 923 size_t len; | |
| 924 ngx_uint_t i, ident, flags, code, nqs, nan, qtype, qclass; | |
| 925 ngx_resolver_qs_t *qs; | |
| 926 ngx_resolver_query_t *query; | |
| 927 | |
| 928 if ((size_t) n < sizeof(ngx_resolver_query_t) + 1) { | |
| 929 goto short_response; | |
| 930 } | |
| 931 | |
| 932 query = (ngx_resolver_query_t *) buf; | |
| 933 | |
| 934 ident = (query->ident_hi << 8) + query->ident_lo; | |
| 935 flags = (query->flags_hi << 8) + query->flags_lo; | |
| 936 nqs = (query->nqs_hi << 8) + query->nqs_lo; | |
| 937 nan = (query->nan_hi << 8) + query->nan_lo; | |
| 938 | |
| 939 ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 940 "resolver DNS response %d fl:%04Xud %d/%d/%d/%d", | |
| 941 ident, flags, nqs, nan, | |
| 942 (query->nns_hi << 8) + query->nns_lo, | |
| 943 (query->nar_hi << 8) + query->nar_lo); | |
| 944 | |
| 945 if (!(flags & 0x8000)) { | |
| 946 ngx_log_error(r->log_level, r->log, 0, | |
| 947 "invalid DNS response %d fl:%04Xud", ident, flags); | |
| 948 return; | |
| 949 } | |
| 950 | |
| 951 code = flags & 0x7f; | |
| 952 | |
| 953 if (code == NGX_RESOLVE_FORMERR || code > NGX_RESOLVE_REFUSED) { | |
| 954 ngx_log_error(r->log_level, r->log, 0, | |
| 955 "DNS error (%d: %s), query id:%d", | |
| 956 code, ngx_resolver_strerror(code), ident); | |
| 957 return; | |
| 958 } | |
| 959 | |
| 960 if (nqs != 1) { | |
| 961 err = "invalid number of questions in DNS response"; | |
| 962 goto done; | |
| 963 } | |
| 964 | |
| 965 i = sizeof(ngx_resolver_query_t); | |
| 966 | |
| 967 while (i < (ngx_uint_t) n) { | |
| 968 if (buf[i] == '\0') { | |
| 969 goto found; | |
| 970 } | |
| 971 | |
| 972 len = buf[i]; | |
| 973 i += 1 + len; | |
| 974 } | |
| 975 | |
| 976 goto short_response; | |
| 977 | |
| 978 found: | |
| 979 | |
| 980 if (i++ == 0) { | |
| 981 err = "zero-length domain name in DNS response"; | |
| 982 goto done; | |
| 983 } | |
| 984 | |
| 985 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t)) | |
| 986 > (ngx_uint_t) n) | |
| 987 { | |
| 988 goto short_response; | |
| 989 } | |
| 990 | |
| 991 qs = (ngx_resolver_qs_t *) &buf[i]; | |
| 992 | |
| 993 qtype = (qs->type_hi << 8) + qs->type_lo; | |
| 994 qclass = (qs->class_hi << 8) + qs->class_lo; | |
| 995 | |
| 996 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 997 "resolver DNS response qt:%d cl:%d", qtype, qclass); | |
| 998 | |
| 999 if (qclass != 1) { | |
| 1000 ngx_log_error(r->log_level, r->log, 0, | |
| 1001 "unknown query class %d in DNS response", qclass); | |
| 1002 return; | |
| 1003 } | |
| 1004 | |
| 1005 switch (qtype) { | |
| 1006 | |
| 1007 case NGX_RESOLVE_A: | |
| 1008 | |
| 1009 ngx_resolver_process_a(r, buf, n, ident, code, nan, | |
|
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changeset
|
1010 i + sizeof(ngx_resolver_qs_t)); |
| 1649 | 1011 |
| 1012 break; | |
| 1013 | |
| 1014 case NGX_RESOLVE_PTR: | |
| 1015 | |
|
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|
1016 ngx_resolver_process_ptr(r, buf, n, ident, code, nan); |
| 1649 | 1017 |
| 1018 break; | |
| 1019 | |
| 1020 default: | |
| 1021 ngx_log_error(r->log_level, r->log, 0, | |
| 1022 "unknown query type %d in DNS response", qtype); | |
| 1023 return; | |
| 1024 } | |
| 1025 | |
| 1026 return; | |
| 1027 | |
| 1028 short_response: | |
| 1029 | |
| 1030 err = "short dns response"; | |
| 1031 | |
| 1032 done: | |
| 1033 | |
| 1034 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1035 | |
| 1036 return; | |
| 1037 } | |
| 1038 | |
| 1039 | |
| 1040 static void | |
| 1041 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last, | |
| 1042 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans) | |
| 583 | 1043 { |
| 1649 | 1044 char *err; |
| 1045 u_char *cname; | |
| 1046 size_t len; | |
| 1047 uint32_t hash; | |
| 1048 in_addr_t addr, *addrs; | |
| 1049 ngx_str_t name; | |
| 1050 ngx_uint_t qtype, qident, naddrs, a, i, n, start; | |
| 1051 ngx_resolver_an_t *an; | |
| 1052 ngx_resolver_ctx_t *ctx, *next; | |
| 1053 ngx_resolver_node_t *rn; | |
| 1054 | |
| 1055 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) { | |
| 1056 return; | |
| 1057 } | |
| 1058 | |
| 1059 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); | |
| 1060 | |
| 1061 hash = ngx_crc32_short(name.data, name.len); | |
| 1062 | |
| 1063 /* lock name mutex */ | |
| 1064 | |
| 1065 rn = ngx_resolver_lookup_name(r, &name, hash); | |
| 1066 | |
| 1067 if (rn == NULL || rn->query == NULL) { | |
| 1068 ngx_log_error(r->log_level, r->log, 0, | |
| 1069 "unexpected response for %V", &name); | |
| 1070 goto failed; | |
| 1071 } | |
| 1072 | |
| 1073 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 1074 | |
| 1075 if (ident != qident) { | |
| 1076 ngx_log_error(r->log_level, r->log, 0, | |
| 1077 "wrong ident %d response for %V, expect %d", | |
| 1078 ident, &name, qident); | |
| 1079 goto failed; | |
| 1080 } | |
| 1081 | |
|
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diff
changeset
|
1082 if (code == 0 && nan == 0) { |
|
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no answers in DNS response should be NXDOMAIN
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diff
changeset
|
1083 code = 3; /* NXDOMAIN */ |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
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parents:
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diff
changeset
|
1084 } |
|
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no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
1085 |
| 1649 | 1086 if (code) { |
| 1087 next = rn->waiting; | |
| 1088 rn->waiting = NULL; | |
| 1089 | |
| 1090 ngx_queue_remove(&rn->queue); | |
| 1091 | |
| 1092 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 1093 | |
| 1094 ngx_resolver_free_node(r, rn); | |
| 1095 | |
| 1096 /* unlock name mutex */ | |
| 1097 | |
| 1098 while (next) { | |
| 1099 ctx = next; | |
| 1100 ctx->state = code; | |
| 1101 next = ctx->next; | |
| 1102 | |
| 1103 ctx->handler(ctx); | |
| 1104 } | |
| 1105 | |
| 1106 return; | |
| 1107 } | |
| 1108 | |
| 1109 i = ans; | |
| 1110 naddrs = 0; | |
| 1111 addr = 0; | |
| 1112 addrs = NULL; | |
| 1113 cname = NULL; | |
| 1114 qtype = 0; | |
| 1115 | |
| 1116 for (a = 0; a < nan; a++) { | |
| 1117 | |
| 1118 start = i; | |
| 1119 | |
| 1120 while (i < last) { | |
| 1121 | |
| 1122 if (buf[i] & 0xc0) { | |
| 1123 i += 2; | |
| 1124 goto found; | |
| 1125 } | |
| 1126 | |
| 1127 if (buf[i] == 0) { | |
| 1128 i++; | |
| 1129 goto test_length; | |
| 1130 } | |
| 1131 | |
| 1132 i += 1 + buf[i]; | |
| 1133 } | |
| 1134 | |
| 1135 goto short_response; | |
| 1136 | |
| 1137 test_length: | |
| 1138 | |
| 1139 if (i - start < 2) { | |
| 1140 err = "invalid name in dns response"; | |
| 1141 goto invalid; | |
| 1142 } | |
| 1143 | |
| 1144 found: | |
| 1145 | |
| 1146 if (i + sizeof(ngx_resolver_an_t) >= last) { | |
| 1147 goto short_response; | |
| 1148 } | |
| 1149 | |
| 1150 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1151 | |
| 1152 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1153 len = (an->len_hi << 8) + an->len_lo; | |
| 1154 | |
| 1155 if (qtype == NGX_RESOLVE_A) { | |
| 1156 | |
| 1157 i += sizeof(ngx_resolver_an_t); | |
| 1158 | |
| 1159 if (i + len > last) { | |
| 1160 goto short_response; | |
| 1161 } | |
| 1162 | |
| 1163 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1164 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1165 | |
| 1166 naddrs++; | |
| 1167 | |
| 1168 i += len; | |
| 1169 | |
| 1170 } else if (qtype == NGX_RESOLVE_CNAME) { | |
| 1171 cname = &buf[i] + sizeof(ngx_resolver_an_t); | |
| 1172 i += sizeof(ngx_resolver_an_t) + len; | |
| 1173 } | |
| 1174 } | |
| 1175 | |
| 1176 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1177 "resolver naddrs:%ui cname:%p", naddrs, cname); | |
| 1178 | |
| 1179 if (naddrs) { | |
| 1180 | |
| 1181 if (naddrs == 1) { | |
| 1182 rn->u.addr = addr; | |
| 1183 | |
| 1184 } else { | |
| 1185 | |
| 1186 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t)); | |
| 1187 if (addrs == NULL) { | |
| 1188 return; | |
| 1189 } | |
| 1190 | |
| 1191 n = 0; | |
| 1192 i = ans; | |
| 1193 | |
| 1194 for (a = 0; a < nan; a++) { | |
| 1195 | |
| 1196 for ( ;; ) { | |
| 1197 | |
| 1198 if (buf[i] & 0xc0) { | |
| 1199 i += 2; | |
| 1200 goto ok; | |
| 1201 } | |
| 1202 | |
| 1203 if (buf[i] == 0) { | |
| 1204 i++; | |
| 1205 goto ok; | |
| 1206 } | |
| 1207 | |
| 1208 i += 1 + buf[i]; | |
| 1209 } | |
| 1210 | |
| 1211 ok: | |
| 1212 | |
| 1213 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1214 | |
| 1215 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1216 len = (an->len_hi << 8) + an->len_lo; | |
| 1217 | |
| 1218 i += sizeof(ngx_resolver_an_t); | |
| 1219 | |
| 1220 if (qtype == NGX_RESOLVE_A) { | |
| 1221 | |
| 1222 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1223 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1224 | |
| 1225 if (n == naddrs) { | |
| 1226 break; | |
| 1227 } | |
| 1228 } | |
| 1229 | |
| 1230 i += len; | |
| 1231 } | |
| 1232 | |
| 1233 rn->u.addrs = addrs; | |
| 1234 | |
| 1235 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
| 1236 naddrs * sizeof(in_addr_t)); | |
| 1237 if (addrs == NULL) { | |
| 1238 return; | |
| 1239 } | |
| 1240 } | |
| 1241 | |
| 1242 rn->naddrs = (u_short) naddrs; | |
| 1243 | |
| 1244 ngx_queue_remove(&rn->queue); | |
| 1245 | |
| 1246 rn->valid = ngx_time() + r->valid; | |
| 1247 rn->expire = ngx_time() + r->expire; | |
| 1248 | |
| 1249 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1250 | |
| 1251 next = rn->waiting; | |
| 1252 rn->waiting = NULL; | |
| 1253 | |
| 1254 /* unlock name mutex */ | |
| 1255 | |
| 1256 while (next) { | |
| 1257 ctx = next; | |
| 1258 ctx->state = NGX_OK; | |
| 1259 ctx->naddrs = naddrs; | |
| 1260 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 1261 ctx->addr = addr; | |
| 1262 next = ctx->next; | |
| 1263 | |
| 1264 ctx->handler(ctx); | |
| 1265 } | |
| 1266 | |
| 1267 if (naddrs) { | |
| 1268 ngx_resolver_free(r, addrs); | |
| 1269 } | |
| 1270 | |
| 1271 return; | |
| 1272 | |
| 1273 } else if (cname) { | |
| 1274 | |
| 1275 /* CNAME only */ | |
| 1276 | |
| 1277 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) { | |
| 1278 return; | |
| 1279 } | |
| 1280 | |
| 1281 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1282 "resolver cname:\"%V\"", &name); | |
| 1283 | |
|
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0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1284 ngx_queue_remove(&rn->queue); |
|
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
1285 |
| 1649 | 1286 rn->cnlen = (u_short) name.len; |
| 1287 rn->u.cname = name.data; | |
| 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 ctx = rn->waiting; | |
| 1294 rn->waiting = NULL; | |
| 1295 | |
| 1296 if (ctx) { | |
| 1297 ctx->name = name; | |
| 1298 | |
| 1299 (void) ngx_resolve_name_locked(r, ctx); | |
| 1300 } | |
| 1301 | |
| 1302 return; | |
| 1303 } | |
| 1304 | |
| 1305 ngx_log_error(r->log_level, r->log, 0, | |
| 1306 "no A or CNAME types in DNS responses, unknown query type: %d", | |
| 1307 qtype); | |
| 1308 return; | |
| 1309 | |
| 1310 short_response: | |
| 1311 | |
| 1312 err = "short dns response"; | |
| 1313 | |
| 1314 invalid: | |
| 1315 | |
| 1316 /* unlock name mutex */ | |
| 1317 | |
| 1318 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1319 | |
| 1320 return; | |
| 1321 | |
| 1322 failed: | |
| 1323 | |
| 1324 /* unlock name mutex */ | |
| 1325 | |
| 1326 return; | |
| 1327 } | |
| 1328 | |
| 1329 | |
| 1330 static void | |
| 1331 ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, | |
|
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268b81386fe4
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Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
1332 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan) |
| 1649 | 1333 { |
| 1334 char *err; | |
| 1335 size_t len; | |
| 1336 in_addr_t addr; | |
| 1337 ngx_int_t digit; | |
| 1338 ngx_str_t name; | |
| 1339 ngx_uint_t i, mask, qtype, qclass, qident; | |
| 1340 ngx_resolver_an_t *an; | |
| 1341 ngx_resolver_ctx_t *ctx, *next; | |
| 1342 ngx_resolver_node_t *rn; | |
| 1343 | |
| 1344 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) { | |
| 1345 goto invalid_in_addr_arpa; | |
| 1346 } | |
| 1347 | |
| 1348 addr = 0; | |
| 1349 i = 12; | |
| 1350 | |
| 1351 for (mask = 0; mask < 32; mask += 8) { | |
| 1352 len = buf[i++]; | |
| 1353 | |
| 1354 digit = ngx_atoi(&buf[i], len); | |
| 1355 if (digit == NGX_ERROR || digit > 255) { | |
| 1356 goto invalid_in_addr_arpa; | |
| 1357 } | |
| 1358 | |
| 1359 addr += digit << mask; | |
| 1360 i += len; | |
| 1361 } | |
| 1362 | |
| 1363 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) { | |
| 1364 goto invalid_in_addr_arpa; | |
| 1365 } | |
| 1366 | |
| 1367 /* lock addr mutex */ | |
| 1368 | |
| 1369 rn = ngx_resolver_lookup_addr(r, addr); | |
| 1370 | |
| 1371 if (rn == NULL || rn->query == NULL) { | |
| 1372 ngx_log_error(r->log_level, r->log, 0, | |
| 1373 "unexpected response for %ud.%ud.%ud.%ud", | |
| 1374 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 1375 (addr >> 8) & 0xff, addr & 0xff); | |
| 1376 goto failed; | |
| 1377 } | |
| 1378 | |
| 1379 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 1380 | |
| 1381 if (ident != qident) { | |
| 1382 ngx_log_error(r->log_level, r->log, 0, | |
| 1383 "wrong ident %d response for %ud.%ud.%ud.%ud, expect %d", | |
| 1384 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 1385 (addr >> 8) & 0xff, addr & 0xff, qident); | |
| 1386 goto failed; | |
| 1387 } | |
| 1388 | |
|
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268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1389 if (code == 0 && nan == 0) { |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1390 code = 3; /* NXDOMAIN */ |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1391 } |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
1392 |
| 1649 | 1393 if (code) { |
| 1394 next = rn->waiting; | |
| 1395 rn->waiting = NULL; | |
| 1396 | |
| 1397 ngx_queue_remove(&rn->queue); | |
| 1398 | |
| 1399 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 1400 | |
| 1401 ngx_resolver_free_node(r, rn); | |
| 1402 | |
| 1403 /* unlock addr mutex */ | |
| 1404 | |
| 1405 while (next) { | |
| 1406 ctx = next; | |
| 1407 ctx->state = code; | |
| 1408 next = ctx->next; | |
| 1409 | |
| 1410 ctx->handler(ctx); | |
| 1411 } | |
| 1412 | |
| 1413 return; | |
| 1414 } | |
| 1415 | |
| 1416 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t); | |
| 1417 | |
| 1418 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) { | |
| 1419 goto short_response; | |
| 1420 } | |
| 1421 | |
| 1422 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */ | |
| 1423 | |
| 1424 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) { | |
| 1425 err = "invalid in-addr.arpa name in DNS response"; | |
| 1426 goto invalid; | |
| 1427 } | |
| 1428 | |
| 1429 an = (ngx_resolver_an_t *) &buf[i + 2]; | |
| 1430 | |
| 1431 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1432 qclass = (an->class_hi << 8) + an->class_lo; | |
| 1433 len = (an->len_hi << 8) + an->len_lo; | |
| 1434 | |
| 1435 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1436 "resolver qt:%d cl:%d len:%uz", qtype, qclass, len); | |
| 1437 | |
| 1438 i += 2 + sizeof(ngx_resolver_an_t); | |
| 1439 | |
| 1440 if (i + len > (ngx_uint_t) n) { | |
| 1441 goto short_response; | |
| 1442 } | |
| 1443 | |
| 1444 len -= 2; | |
| 1445 | |
| 1446 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) { | |
| 1447 return; | |
| 1448 } | |
| 1449 | |
| 1450 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name); | |
| 1451 | |
| 1452 if (len != (size_t) rn->nlen || ngx_strncmp(name.data, rn->name, len) != 0) | |
| 1453 { | |
| 1454 ngx_resolver_free(r, rn->name); | |
| 1455 rn->name = name.data; | |
| 1456 | |
| 1457 name.data = ngx_resolver_dup(r, rn->name, len); | |
| 1458 if (name.data == NULL) { | |
| 1459 goto failed; | |
| 1460 } | |
| 1461 } | |
| 1462 | |
| 1463 ngx_queue_remove(&rn->queue); | |
| 1464 | |
| 1465 rn->valid = ngx_time() + r->valid; | |
| 1466 rn->expire = ngx_time() + r->expire; | |
| 1467 | |
| 1468 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
| 1469 | |
| 1470 next = rn->waiting; | |
| 1471 rn->waiting = NULL; | |
| 1472 | |
| 1473 /* unlock addr mutex */ | |
| 1474 | |
| 1475 while (next) { | |
| 1476 ctx = next; | |
| 1477 ctx->state = NGX_OK; | |
| 1478 ctx->name = name; | |
| 1479 next = ctx->next; | |
| 1480 | |
| 1481 ctx->handler(ctx); | |
| 1482 } | |
| 1483 | |
| 1484 ngx_resolver_free(r, name.data); | |
| 1485 | |
| 1486 return; | |
| 1487 | |
| 1488 invalid_in_addr_arpa: | |
| 1489 | |
| 1490 ngx_log_error(r->log_level, r->log, 0, | |
| 1491 "invalid in-addr.arpa name in DNS response"); | |
| 1492 return; | |
| 1493 | |
| 1494 short_response: | |
| 1495 | |
| 1496 err = "short DNS response"; | |
| 1497 | |
| 1498 invalid: | |
| 1499 | |
| 1500 /* unlock addr mutex */ | |
| 1501 | |
| 1502 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1503 | |
| 1504 return; | |
| 1505 | |
| 1506 failed: | |
| 1507 | |
| 1508 /* unlock addr mutex */ | |
| 1509 | |
| 1510 return; | |
| 1511 } | |
| 1512 | |
| 1513 | |
| 1514 static ngx_resolver_node_t * | |
| 1515 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) | |
| 1516 { | |
| 1517 ngx_int_t rc; | |
| 1518 size_t len; | |
| 1519 ngx_rbtree_node_t *node, *sentinel; | |
| 1520 ngx_resolver_node_t *rn; | |
| 1521 | |
| 1522 node = r->name_rbtree.root; | |
| 1523 sentinel = r->name_rbtree.sentinel; | |
| 1524 | |
| 1525 while (node != sentinel) { | |
| 1526 | |
| 1527 if (hash < node->key) { | |
| 1528 node = node->left; | |
| 1529 continue; | |
| 1530 } | |
| 1531 | |
| 1532 if (hash > node->key) { | |
| 1533 node = node->right; | |
| 1534 continue; | |
| 1535 } | |
| 1536 | |
| 1537 /* hash == node->key */ | |
| 1538 | |
| 1539 do { | |
| 1540 rn = (ngx_resolver_node_t *) node; | |
| 1541 | |
| 1542 len = (name->len > (size_t) rn->nlen) ? rn->nlen : name->len; | |
| 1543 | |
| 1544 rc = ngx_strncmp(name->data, rn->name, len); | |
| 1545 | |
| 1546 if (rc == 0) { | |
| 1547 return rn; | |
| 1548 } | |
| 1549 | |
| 1550 node = (rc < 0) ? node->left : node->right; | |
| 1551 | |
| 1552 } while (node != sentinel && hash == node->key); | |
| 1553 | |
| 1554 break; | |
| 1555 } | |
| 1556 | |
| 1557 /* not found */ | |
| 1558 | |
| 1559 return NULL; | |
| 1560 } | |
| 1561 | |
| 1562 | |
| 1563 static ngx_resolver_node_t * | |
| 1564 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr) | |
| 1565 { | |
| 1566 ngx_rbtree_node_t *node, *sentinel; | |
| 1567 | |
| 1568 node = r->addr_rbtree.root; | |
| 1569 sentinel = r->addr_rbtree.sentinel; | |
| 1570 | |
| 1571 while (node != sentinel) { | |
| 1572 | |
| 1573 if (addr < node->key) { | |
| 1574 node = node->left; | |
| 1575 continue; | |
| 1576 } | |
| 1577 | |
| 1578 if (addr > node->key) { | |
| 1579 node = node->right; | |
| 1580 continue; | |
| 1581 } | |
| 1582 | |
| 1583 /* addr == node->key */ | |
| 1584 | |
| 1585 return (ngx_resolver_node_t *) node; | |
| 1586 } | |
| 1587 | |
| 1588 /* not found */ | |
| 1589 | |
| 1590 return NULL; | |
| 1591 } | |
| 1592 | |
| 1593 | |
| 1594 static void | |
| 1595 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
| 1596 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
| 1597 { | |
| 1598 size_t len; | |
| 1599 ngx_rbtree_node_t **p; | |
| 1600 ngx_resolver_node_t *rn, *rn_temp; | |
| 1601 | |
| 1602 for ( ;; ) { | |
| 1603 | |
| 1604 if (node->key < temp->key) { | |
| 1605 | |
| 1606 p = &temp->left; | |
| 1607 | |
| 1608 } else if (node->key > temp->key) { | |
| 1609 | |
| 1610 p = &temp->right; | |
| 1611 | |
| 1612 } else { /* node->key == temp->key */ | |
| 1613 | |
| 1614 rn = (ngx_resolver_node_t *) node; | |
| 1615 rn_temp = (ngx_resolver_node_t *) temp; | |
| 1616 | |
| 1617 len = (rn->nlen > rn_temp->nlen) ? rn_temp->nlen : rn->nlen; | |
| 1618 | |
| 1619 p = (ngx_strncmp(rn->name, rn_temp->name, len) < 0) | |
| 1620 ? &temp->left : &temp->right; | |
| 1621 } | |
| 1622 | |
| 1623 if (*p == sentinel) { | |
| 1624 break; | |
| 1625 } | |
| 1626 | |
| 1627 temp = *p; | |
| 1628 } | |
| 1629 | |
| 1630 *p = node; | |
| 1631 node->parent = temp; | |
| 1632 node->left = sentinel; | |
| 1633 node->right = sentinel; | |
| 1634 ngx_rbt_red(node); | |
| 1635 } | |
| 1636 | |
| 1637 | |
| 1638 static ngx_int_t | |
| 1639 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1640 { | |
| 1641 u_char *p, *s; | |
| 1642 size_t len; | |
| 1643 ngx_uint_t ident; | |
| 1644 ngx_resolver_qs_t *qs; | |
| 1645 ngx_resolver_query_t *query; | |
| 1646 | |
| 1647 len = sizeof(ngx_resolver_query_t) | |
| 1648 + 1 + ctx->name.len + 1 + sizeof(ngx_resolver_qs_t); | |
| 1649 | |
| 1650 p = ngx_resolver_calloc(ctx->resolver, len); | |
| 1651 if (p == NULL) { | |
| 1652 return NGX_ERROR; | |
| 1653 } | |
| 1654 | |
| 1655 rn->qlen = (u_short) len; | |
| 1656 rn->query = p; | |
| 1657 | |
| 1658 query = (ngx_resolver_query_t *) p; | |
| 1659 | |
| 1660 ident = ngx_random(); | |
| 1661 | |
| 1662 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0, | |
| 1663 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff); | |
| 1664 | |
| 1665 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1666 query->ident_lo = (u_char) (ident & 0xff); | |
| 1667 | |
| 1668 /* recursion query */ | |
| 1669 query->flags_hi = 1; query->flags_lo = 0; | |
| 1670 | |
| 1671 /* one question */ | |
| 1672 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1673 query->nan_hi = 0; query->nan_lo = 0; | |
| 1674 query->nns_hi = 0; query->nns_lo = 0; | |
| 1675 query->nar_hi = 0; query->nar_lo = 0; | |
| 1676 | |
| 1677 p += sizeof(ngx_resolver_query_t) + 1 + ctx->name.len + 1; | |
| 1678 | |
| 1679 qs = (ngx_resolver_qs_t *) p; | |
| 1680 | |
| 1681 /* query type */ | |
| 1682 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type; | |
| 1683 | |
| 1684 /* IP query class */ | |
| 1685 qs->class_hi = 0; qs->class_lo = 1; | |
| 1686 | |
| 1687 /* convert "www.example.com" to "\3www\7example\3com\0" */ | |
| 1688 | |
| 1689 len = 0; | |
| 1690 p--; | |
| 1691 *p-- = '\0'; | |
| 1692 | |
| 1693 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) { | |
| 1694 if (*s != '.') { | |
| 1695 *p = *s; | |
| 1696 len++; | |
| 1697 | |
| 1698 } else { | |
| 1699 *p = (u_char) len; | |
| 1700 len = 0; | |
| 1701 } | |
| 1702 | |
| 1703 p--; | |
| 1704 } | |
| 1705 | |
| 1706 *p = (u_char) len; | |
| 1707 | |
| 1708 return NGX_OK; | |
| 1709 } | |
| 1710 | |
| 1711 | |
| 1712 /* AF_INET only */ | |
| 1713 | |
| 1714 static ngx_int_t | |
| 1715 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1716 { | |
| 1717 u_char *p, *d; | |
| 1718 size_t len; | |
| 1719 ngx_int_t n; | |
| 1720 ngx_uint_t ident; | |
| 1721 ngx_resolver_query_t *query; | |
| 1722 | |
| 1723 len = sizeof(ngx_resolver_query_t) | |
| 1724 + sizeof(".255.255.255.255.in-addr.arpa.") - 1 | |
| 1725 + sizeof(ngx_resolver_qs_t); | |
| 1726 | |
| 1727 p = ngx_resolver_calloc(ctx->resolver, len); | |
| 1728 if (p == NULL) { | |
| 1729 return NGX_ERROR; | |
| 1730 } | |
| 1731 | |
| 1732 rn->query = p; | |
| 1733 query = (ngx_resolver_query_t *) p; | |
| 1734 | |
| 1735 ident = ngx_random(); | |
| 1736 | |
| 1737 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1738 query->ident_lo = (u_char) (ident & 0xff); | |
| 1739 | |
| 1740 /* recursion query */ | |
| 1741 query->flags_hi = 1; query->flags_lo = 0; | |
| 1742 | |
| 1743 /* one question */ | |
| 1744 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1745 query->nan_hi = 0; query->nan_lo = 0; | |
| 1746 query->nns_hi = 0; query->nns_lo = 0; | |
| 1747 query->nar_hi = 0; query->nar_lo = 0; | |
| 1748 | |
| 1749 p += sizeof(ngx_resolver_query_t); | |
| 1750 | |
| 1751 for (n = 0; n < 32; n += 8){ | |
| 1752 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff); | |
| 1753 *p = (u_char) (d - &p[1]); | |
| 1754 p = d; | |
| 1755 } | |
| 1756 | |
| 1757 /* query type "PTR", IP query class */ | |
| 1758 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18); | |
| 1759 | |
| 1760 rn->qlen = (u_short) | |
| 1761 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t) | |
| 1762 - rn->query); | |
| 1763 | |
| 1764 return NGX_OK; | |
| 1765 } | |
| 1766 | |
| 1767 | |
| 1768 static ngx_int_t | |
| 1769 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src, | |
| 1770 u_char *last) | |
| 1771 { | |
| 1772 char *err; | |
| 1773 u_char *p, *dst; | |
| 1774 ssize_t len; | |
| 1775 ngx_uint_t i, n; | |
| 1776 | |
| 1777 p = src; | |
| 1778 len = -1; | |
| 1779 | |
| 1780 /* | |
| 1781 * compression pointers allow to create endless loop, so we set limit; | |
| 1782 * 128 pointers should be enough to store 255-byte name | |
| 1783 */ | |
| 1784 | |
| 1785 for (i = 0; i < 128; i++) { | |
| 1786 n = *p++; | |
| 1787 | |
| 1788 if (n == 0) { | |
| 1789 goto done; | |
| 1790 } | |
| 1791 | |
| 1792 if (n & 0xc0) { | |
| 1793 n = (n & 0x3f << 8) + *p; | |
| 1794 p = &buf[n]; | |
| 1795 | |
| 1796 } else { | |
| 1797 len += 1 + n; | |
| 1798 p = &p[n]; | |
| 1799 } | |
| 1800 | |
| 1801 if (p >= last) { | |
| 1802 err = "name is out of response"; | |
| 1803 goto invalid; | |
| 1804 } | |
| 1805 } | |
| 1806 | |
| 1807 err = "compression pointers loop"; | |
| 1808 | |
| 1809 invalid: | |
| 1810 | |
| 1811 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1812 | |
| 1813 return NGX_ERROR; | |
| 1814 | |
| 1815 done: | |
| 1816 | |
| 1817 if (name == NULL) { | |
| 583 | 1818 return NGX_OK; |
| 1819 } | |
| 1820 | |
| 1649 | 1821 dst = ngx_resolver_alloc(r, len); |
| 1822 if (dst == NULL) { | |
| 1823 return NGX_ERROR; | |
| 1824 } | |
| 1825 | |
| 1826 name->data = dst; | |
| 1827 | |
| 1828 n = *src++; | |
| 1829 | |
| 1830 for ( ;; ) { | |
| 1831 if (n != 0xc0) { | |
| 1832 ngx_memcpy(dst, src, n); | |
| 1833 dst += n; | |
| 1834 src += n; | |
| 1835 | |
| 1836 n = *src++; | |
| 1837 | |
| 1838 if (n != 0) { | |
| 1839 *dst++ = '.'; | |
| 1840 } | |
| 1841 | |
| 1842 } else { | |
| 1843 n = (n & 0x3f << 8) + *src; | |
| 1844 src = &buf[n]; | |
| 1845 | |
| 1846 n = *src++; | |
| 1847 } | |
| 1848 | |
| 1849 if (n == 0) { | |
| 1850 name->len = dst - name->data; | |
| 1851 return NGX_OK; | |
| 1852 } | |
| 1853 } | |
| 1854 } | |
| 1855 | |
| 1856 | |
| 1857 static void | |
| 1858 ngx_resolver_timeout_handler(ngx_event_t *ev) | |
| 1859 { | |
| 1860 ngx_resolver_ctx_t *ctx; | |
| 1861 | |
| 1862 ctx = ev->data; | |
| 1863 | |
| 1864 ctx->state = NGX_RESOLVE_TIMEDOUT; | |
| 1865 | |
| 1866 ctx->handler(ctx); | |
| 1867 } | |
| 1868 | |
| 1869 | |
| 1870 static void | |
| 1871 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 1872 { | |
| 1873 /* lock alloc mutex */ | |
| 1874 | |
| 1875 if (rn->query) { | |
| 1876 ngx_resolver_free_locked(r, rn->query); | |
| 1877 } | |
| 1878 | |
| 1879 if (rn->name) { | |
| 1880 ngx_resolver_free_locked(r, rn->name); | |
| 1881 } | |
| 1882 | |
| 1883 if (rn->cnlen) { | |
| 1884 ngx_resolver_free_locked(r, rn->u.cname); | |
| 1885 } | |
| 1886 | |
| 1887 if (rn->naddrs > 1) { | |
| 1888 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 1889 } | |
| 1890 | |
| 1891 ngx_resolver_free_locked(r, rn); | |
| 1892 | |
| 1893 /* unlock alloc mutex */ | |
| 1894 } | |
| 1895 | |
| 1896 | |
| 1897 static void * | |
| 1898 ngx_resolver_alloc(ngx_resolver_t *r, size_t size) | |
| 1899 { | |
| 1900 u_char *p; | |
| 1901 | |
| 1902 /* lock alloc mutex */ | |
| 1903 | |
| 1904 p = ngx_alloc(size, r->log); | |
| 1905 | |
| 1906 /* unlock alloc mutex */ | |
| 1907 | |
| 1908 return p; | |
| 1909 } | |
| 1910 | |
| 1911 | |
| 1903 | 1912 static void * |
| 1649 | 1913 ngx_resolver_calloc(ngx_resolver_t *r, size_t size) |
| 1914 { | |
| 1915 u_char *p; | |
| 1916 | |
| 1917 p = ngx_resolver_alloc(r, size); | |
| 1918 | |
| 1919 if (p) { | |
| 1920 ngx_memzero(p, size); | |
| 1921 } | |
| 1922 | |
| 1923 return p; | |
| 1924 } | |
| 1925 | |
| 1926 | |
| 1927 static void | |
| 1928 ngx_resolver_free(ngx_resolver_t *r, void *p) | |
| 1929 { | |
| 1930 /* lock alloc mutex */ | |
| 1931 | |
| 1932 ngx_free(p); | |
| 1933 | |
| 1934 /* unlock alloc mutex */ | |
| 1935 } | |
| 1936 | |
| 1937 | |
| 1938 static void | |
| 1939 ngx_resolver_free_locked(ngx_resolver_t *r, void *p) | |
| 1940 { | |
| 1941 ngx_free(p); | |
| 1942 } | |
| 1943 | |
| 1944 | |
| 1945 static void * | |
| 1946 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size) | |
| 1947 { | |
| 1948 void *dst; | |
| 1949 | |
| 1950 dst = ngx_resolver_alloc(r, size); | |
| 1951 | |
| 1952 if (dst == NULL) { | |
| 1953 return dst; | |
| 1954 } | |
| 1955 | |
| 1956 ngx_memcpy(dst, src, size); | |
| 1957 | |
| 1958 return dst; | |
| 1959 } | |
| 1960 | |
| 1961 | |
| 1962 char * | |
| 1963 ngx_resolver_strerror(ngx_int_t err) | |
| 1964 { | |
| 1965 static char *errors[] = { | |
| 1966 "Format error", /* FORMERR */ | |
| 1967 "Server failure", /* SERVFAIL */ | |
| 1968 "Host not found", /* NXDOMAIN */ | |
| 1969 "Unimplemented", /* NOTIMP */ | |
| 1970 "Operation refused" /* REFUSED */ | |
| 1971 }; | |
| 1972 | |
| 1973 if (err > 0 && err < 6) { | |
| 1974 return errors[err - 1]; | |
| 1975 } | |
| 1976 | |
| 1977 if (err == NGX_RESOLVE_TIMEDOUT) { | |
| 1978 return "Operation timed out"; | |
| 1979 } | |
| 1980 | |
| 1981 return "Unknown error"; | |
| 1982 } | |
| 1983 | |
| 1984 | |
| 1985 ngx_int_t | |
| 1986 ngx_udp_connect(ngx_udp_connection_t *uc) | |
| 1987 { | |
| 1988 int rc; | |
| 1989 ngx_int_t event; | |
| 1990 ngx_event_t *rev, *wev; | |
| 1991 ngx_socket_t s; | |
| 1992 ngx_connection_t *c; | |
| 1993 | |
| 583 | 1994 s = ngx_socket(AF_INET, SOCK_DGRAM, 0); |
| 1995 | |
| 1649 | 1996 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, uc->log, 0, "UDP socket %d", s); |
| 583 | 1997 |
| 1998 if (s == -1) { | |
| 1649 | 1999 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
| 583 | 2000 ngx_socket_n " failed"); |
| 2001 return NGX_ERROR; | |
| 2002 } | |
| 2003 | |
| 1649 | 2004 c = ngx_get_connection(s, uc->log); |
| 583 | 2005 |
| 2006 if (c == NULL) { | |
| 2007 if (ngx_close_socket(s) == -1) { | |
| 1649 | 2008 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
| 583 | 2009 ngx_close_socket_n "failed"); |
| 2010 } | |
| 2011 | |
| 2012 return NGX_ERROR; | |
| 2013 } | |
| 2014 | |
| 1649 | 2015 if (ngx_nonblocking(s) == -1) { |
| 2016 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
| 2017 ngx_nonblocking_n " failed"); | |
| 2018 | |
| 2019 ngx_free_connection(c); | |
| 2020 | |
| 2021 if (ngx_close_socket(s) == -1) { | |
| 2022 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
| 2023 ngx_close_socket_n " failed"); | |
| 2024 } | |
| 2025 | |
| 2026 return NGX_ERROR; | |
| 2027 } | |
| 2028 | |
| 583 | 2029 rev = c->read; |
| 2030 wev = c->write; | |
| 2031 | |
| 1649 | 2032 rev->log = uc->log; |
| 2033 wev->log = uc->log; | |
| 2034 | |
| 2035 uc->connection = c; | |
| 583 | 2036 |
| 2037 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); | |
| 2038 | |
| 2039 #if (NGX_THREADS) | |
| 1649 | 2040 |
| 2041 /* TODO: lock event when call completion handler */ | |
| 2042 | |
| 2043 rev->lock = &c->lock; | |
| 2044 wev->lock = &c->lock; | |
| 583 | 2045 rev->own_lock = &c->lock; |
| 2046 wev->own_lock = &c->lock; | |
| 1649 | 2047 |
| 583 | 2048 #endif |
| 2049 | |
| 1649 | 2050 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, uc->log, 0, |
| 2051 "connect to %V, fd:%d #%d", &uc->server, s, c->number); | |
| 2052 | |
| 2053 rc = connect(s, uc->sockaddr, uc->socklen); | |
| 2054 | |
| 2055 /* TODO: aio, iocp */ | |
| 583 | 2056 |
| 2057 if (rc == -1) { | |
| 1649 | 2058 ngx_log_error(NGX_LOG_CRIT, uc->log, ngx_socket_errno, |
| 2059 "connect() to %V failed", &uc->server); | |
| 583 | 2060 |
| 2061 return NGX_ERROR; | |
| 2062 } | |
| 2063 | |
| 1649 | 2064 /* UDP sockets are always ready to write */ |
| 2065 wev->ready = 1; | |
| 2066 | |
| 2067 if (ngx_add_event) { | |
| 2068 | |
| 2069 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ? | |
| 2070 /* kqueue, epoll */ NGX_CLEAR_EVENT: | |
| 2071 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT; | |
| 2072 /* eventport event type has no meaning: oneshot only */ | |
| 2073 | |
| 2074 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { | |
| 2075 return NGX_ERROR; | |
| 2076 } | |
| 2077 | |
| 2078 } else { | |
| 2079 /* rtsig */ | |
| 2080 | |
| 583 | 2081 if (ngx_add_conn(c) == NGX_ERROR) { |
| 2082 return NGX_ERROR; | |
| 2083 } | |
| 2084 } | |
| 2085 | |
| 2086 return NGX_OK; | |
| 2087 } |