Mercurial > hg > nginx
annotate src/core/ngx_resolver.c @ 3376:52e5010cc525
remove stale comment
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Wed, 02 Dec 2009 13:03:54 +0000 |
| parents | 34e99a97fbd6 |
| children | 71193a456616 |
| 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 ngx_resolver_t * | |
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93 ngx_resolver_create(ngx_conf_t *cf, ngx_addr_t *addr) |
| 1649 | 94 { |
| 95 ngx_resolver_t *r; | |
| 1906 | 96 ngx_pool_cleanup_t *cln; |
| 1649 | 97 ngx_udp_connection_t *uc; |
| 98 | |
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99 cln = ngx_pool_cleanup_add(cf->pool, 0); |
| 1906 | 100 if (cln == NULL) { |
| 101 return NULL; | |
| 102 } | |
| 103 | |
| 104 cln->handler = ngx_resolver_cleanup; | |
| 105 | |
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106 r = ngx_calloc(sizeof(ngx_resolver_t), cf->log); |
| 1649 | 107 if (r == NULL) { |
| 108 return NULL; | |
| 109 } | |
| 110 | |
| 1906 | 111 cln->data = r; |
| 112 | |
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113 r->event = ngx_calloc(sizeof(ngx_event_t), cf->log); |
| 1649 | 114 if (r->event == NULL) { |
| 115 return NULL; | |
| 116 } | |
| 117 | |
| 1687 | 118 ngx_rbtree_init(&r->name_rbtree, &r->name_sentinel, |
| 119 ngx_resolver_rbtree_insert_value); | |
| 120 | |
| 121 ngx_rbtree_init(&r->addr_rbtree, &r->addr_sentinel, | |
| 122 ngx_rbtree_insert_value); | |
| 1649 | 123 |
| 1685 | 124 ngx_queue_init(&r->name_resend_queue); |
| 125 ngx_queue_init(&r->addr_resend_queue); | |
| 126 | |
| 127 ngx_queue_init(&r->name_expire_queue); | |
| 128 ngx_queue_init(&r->addr_expire_queue); | |
| 1649 | 129 |
| 130 r->event->handler = ngx_resolver_resend_handler; | |
| 131 r->event->data = r; | |
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132 r->event->log = &cf->cycle->new_log; |
| 1649 | 133 r->ident = -1; |
| 134 | |
| 135 r->resend_timeout = 5; | |
| 136 r->expire = 30; | |
| 137 r->valid = 300; | |
| 138 | |
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139 r->log = &cf->cycle->new_log; |
| 1649 | 140 r->log_level = NGX_LOG_ALERT; |
| 141 | |
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142 if (addr) { |
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143 uc = ngx_calloc(sizeof(ngx_udp_connection_t), cf->log); |
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144 if (uc == NULL) { |
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145 return NULL; |
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146 } |
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147 |
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148 r->udp_connection = uc; |
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149 |
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150 uc->sockaddr = addr->sockaddr; |
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151 uc->socklen = addr->socklen; |
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152 uc->server = addr->name; |
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153 uc->log = &cf->cycle->new_log; |
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154 } |
| 1649 | 155 |
| 156 return r; | |
| 157 } | |
| 158 | |
| 159 | |
| 1906 | 160 static void |
| 161 ngx_resolver_cleanup(void *data) | |
| 162 { | |
| 163 ngx_resolver_t *r = data; | |
| 164 | |
| 165 if (r) { | |
| 166 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, | |
| 167 "cleanup resolver"); | |
| 168 | |
| 169 ngx_resolver_cleanup_tree(r, &r->name_rbtree); | |
| 170 | |
| 171 ngx_resolver_cleanup_tree(r, &r->addr_rbtree); | |
| 172 | |
| 173 if (r->event) { | |
| 174 ngx_free(r->event); | |
| 175 } | |
| 176 | |
| 177 if (r->udp_connection) { | |
| 178 if (r->udp_connection->connection) { | |
| 179 ngx_close_connection(r->udp_connection->connection); | |
| 180 } | |
| 181 | |
| 182 ngx_free(r->udp_connection); | |
| 183 } | |
| 184 | |
| 185 ngx_free(r); | |
| 186 } | |
| 187 } | |
| 188 | |
| 189 | |
| 190 static void | |
| 191 ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree) | |
| 192 { | |
| 193 ngx_resolver_ctx_t *ctx, *next; | |
| 194 ngx_resolver_node_t *rn; | |
| 195 | |
| 196 while (tree->root != tree->sentinel) { | |
| 197 | |
| 198 rn = (ngx_resolver_node_t *) ngx_rbtree_min(tree->root, tree->sentinel); | |
| 199 | |
| 200 ngx_queue_remove(&rn->queue); | |
| 201 | |
| 202 for (ctx = rn->waiting; ctx; ctx = next) { | |
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203 next = ctx->next; |
| 1906 | 204 |
| 205 if (ctx->event) { | |
| 206 ngx_resolver_free(r, ctx->event); | |
| 207 } | |
| 208 | |
| 209 ngx_resolver_free(r, ctx); | |
| 210 } | |
| 211 | |
| 212 ngx_rbtree_delete(tree, &rn->node); | |
| 213 | |
| 214 ngx_resolver_free_node(r, rn); | |
| 215 } | |
| 216 } | |
| 217 | |
| 218 | |
| 1649 | 219 ngx_resolver_ctx_t * |
| 220 ngx_resolve_start(ngx_resolver_t *r, ngx_resolver_ctx_t *temp) | |
| 221 { | |
| 222 in_addr_t addr; | |
| 223 ngx_resolver_ctx_t *ctx; | |
| 224 | |
| 225 if (temp) { | |
| 226 addr = ngx_inet_addr(temp->name.data, temp->name.len); | |
| 227 | |
| 228 if (addr != INADDR_NONE) { | |
| 229 temp->resolver = r; | |
| 230 temp->state = NGX_OK; | |
| 231 temp->naddrs = 1; | |
| 232 temp->addrs = &temp->addr; | |
| 233 temp->addr = addr; | |
| 234 temp->quick = 1; | |
| 235 | |
| 236 return temp; | |
| 237 } | |
| 238 } | |
| 239 | |
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240 if (r->udp_connection == NULL) { |
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241 return NGX_NO_RESOLVER; |
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242 } |
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243 |
| 1649 | 244 ctx = ngx_resolver_calloc(r, sizeof(ngx_resolver_ctx_t)); |
| 245 | |
| 246 if (ctx) { | |
| 247 ctx->resolver = r; | |
| 248 } | |
| 249 | |
| 250 return ctx; | |
| 251 } | |
| 252 | |
| 253 | |
| 254 ngx_int_t | |
| 255 ngx_resolve_name(ngx_resolver_ctx_t *ctx) | |
| 256 { | |
| 257 ngx_int_t rc; | |
| 258 ngx_resolver_t *r; | |
| 259 | |
| 260 r = ctx->resolver; | |
| 261 | |
| 262 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 263 "resolve: \"%V\"", &ctx->name); | |
| 264 | |
| 265 if (ctx->quick) { | |
| 266 ctx->handler(ctx); | |
| 267 return NGX_OK; | |
| 268 } | |
| 269 | |
| 270 /* lock name mutex */ | |
| 271 | |
| 272 rc = ngx_resolve_name_locked(r, ctx); | |
| 273 | |
| 274 if (rc == NGX_OK) { | |
| 275 return NGX_OK; | |
| 276 } | |
| 277 | |
| 278 /* unlock name mutex */ | |
| 279 | |
| 280 if (rc == NGX_AGAIN) { | |
| 281 return NGX_OK; | |
| 282 } | |
| 283 | |
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284 /* NGX_ERROR */ |
| 1649 | 285 |
| 286 if (ctx->event) { | |
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287 ngx_resolver_free(r, ctx->event); |
| 1649 | 288 } |
| 289 | |
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290 ngx_resolver_free(r, ctx); |
| 1649 | 291 |
| 292 return NGX_ERROR; | |
| 293 } | |
| 294 | |
| 295 | |
| 296 void | |
| 297 ngx_resolve_name_done(ngx_resolver_ctx_t *ctx) | |
| 298 { | |
| 299 uint32_t hash; | |
| 300 ngx_resolver_t *r; | |
| 301 ngx_resolver_ctx_t *w, **p; | |
| 302 ngx_resolver_node_t *rn; | |
| 303 | |
| 304 r = ctx->resolver; | |
| 305 | |
| 306 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 307 "resolve name done: %i", ctx->state); | |
| 308 | |
| 309 if (ctx->quick) { | |
| 310 return; | |
| 311 } | |
| 312 | |
| 313 if (ctx->event && ctx->event->timer_set) { | |
| 314 ngx_del_timer(ctx->event); | |
| 315 } | |
| 316 | |
| 317 /* lock name mutex */ | |
| 318 | |
| 319 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
| 320 | |
| 321 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
| 322 | |
| 323 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
| 324 | |
| 325 if (rn) { | |
| 326 p = &rn->waiting; | |
| 327 w = rn->waiting; | |
| 328 | |
| 329 while (w) { | |
| 330 if (w == ctx) { | |
| 331 *p = w->next; | |
| 332 | |
| 333 goto done; | |
| 334 } | |
| 335 | |
| 336 p = &w->next; | |
| 337 w = w->next; | |
| 338 } | |
| 339 } | |
| 340 | |
| 341 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
| 342 "could not cancel %V resolving", &ctx->name); | |
| 343 } | |
| 344 | |
| 345 done: | |
| 346 | |
| 347 ngx_resolver_expire(r, &r->name_rbtree, &r->name_expire_queue); | |
| 348 | |
| 349 /* unlock name mutex */ | |
| 350 | |
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351 /* lock alloc mutex */ |
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352 |
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353 if (ctx->event) { |
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354 ngx_resolver_free_locked(r, ctx->event); |
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355 } |
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356 |
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357 ngx_resolver_free_locked(r, ctx); |
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358 |
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359 /* unlock alloc mutex */ |
| 1649 | 360 } |
| 361 | |
| 362 | |
| 363 /* NGX_RESOLVE_A only */ | |
| 364 | |
| 365 static ngx_int_t | |
| 366 ngx_resolve_name_locked(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx) | |
| 367 { | |
| 368 uint32_t hash; | |
| 369 in_addr_t addr, *addrs; | |
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370 ngx_int_t rc; |
| 1649 | 371 ngx_uint_t naddrs; |
| 372 ngx_resolver_ctx_t *next; | |
| 373 ngx_resolver_node_t *rn; | |
| 374 | |
| 375 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
| 376 | |
| 377 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
| 378 | |
| 379 if (rn) { | |
| 380 | |
| 381 if (rn->valid >= ngx_time()) { | |
| 382 | |
| 383 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
| 384 | |
| 385 ngx_queue_remove(&rn->queue); | |
| 386 | |
| 387 rn->expire = ngx_time() + r->expire; | |
| 388 | |
| 389 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 390 | |
| 391 naddrs = rn->naddrs; | |
| 392 | |
| 393 if (naddrs) { | |
| 394 | |
| 395 /* NGX_RESOLVE_A answer */ | |
| 396 | |
| 397 if (naddrs != 1) { | |
| 398 addr = 0; | |
| 399 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
| 400 naddrs * sizeof(in_addr_t)); | |
| 401 if (addrs == NULL) { | |
| 402 return NGX_ERROR; | |
| 403 } | |
| 404 | |
| 405 } else { | |
| 406 addr = rn->u.addr; | |
| 407 addrs = NULL; | |
| 408 } | |
| 409 | |
| 410 ctx->next = rn->waiting; | |
| 411 rn->waiting = NULL; | |
| 412 | |
| 413 /* unlock name mutex */ | |
| 414 | |
| 415 do { | |
| 416 ctx->state = NGX_OK; | |
| 417 ctx->naddrs = naddrs; | |
| 418 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 419 ctx->addr = addr; | |
| 420 next = ctx->next; | |
| 421 | |
| 422 ctx->handler(ctx); | |
| 423 | |
| 424 ctx = next; | |
| 425 } while (ctx); | |
| 426 | |
| 427 if (addrs) { | |
| 428 ngx_resolver_free(r, addrs); | |
| 429 } | |
| 430 | |
| 431 return NGX_OK; | |
| 432 } | |
| 433 | |
| 434 /* NGX_RESOLVE_CNAME */ | |
| 435 | |
| 1969 | 436 if (ctx->recursion++ < NGX_RESOLVER_MAX_RECURSION) { |
| 437 | |
| 438 ctx->name.len = rn->cnlen; | |
| 439 ctx->name.data = rn->u.cname; | |
| 440 | |
| 441 return ngx_resolve_name_locked(r, ctx); | |
| 442 } | |
| 443 | |
| 444 ctx->next = rn->waiting; | |
| 445 rn->waiting = NULL; | |
| 446 | |
| 447 /* unlock name mutex */ | |
| 448 | |
| 449 do { | |
| 450 ctx->state = NGX_RESOLVE_NXDOMAIN; | |
| 451 next = ctx->next; | |
| 452 | |
| 453 ctx->handler(ctx); | |
| 454 | |
| 455 ctx = next; | |
| 456 } while (ctx); | |
| 457 | |
| 458 return NGX_OK; | |
| 1649 | 459 } |
| 460 | |
| 461 if (rn->waiting) { | |
| 462 | |
| 463 ctx->next = rn->waiting; | |
| 464 rn->waiting = ctx; | |
| 3297 | 465 ctx->state = NGX_AGAIN; |
| 1649 | 466 |
| 467 return NGX_AGAIN; | |
| 468 } | |
| 469 | |
| 470 ngx_queue_remove(&rn->queue); | |
| 471 | |
| 472 /* lock alloc mutex */ | |
| 473 | |
| 474 ngx_resolver_free_locked(r, rn->query); | |
|
1960
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fix memory leak on resolver query send failure
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parents:
1914
diff
changeset
|
475 rn->query = NULL; |
| 1649 | 476 |
| 477 if (rn->cnlen) { | |
| 478 ngx_resolver_free_locked(r, rn->u.cname); | |
| 479 } | |
| 480 | |
| 481 if (rn->naddrs > 1) { | |
| 482 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 483 } | |
| 484 | |
| 485 /* unlock alloc mutex */ | |
| 486 | |
| 487 } else { | |
| 488 | |
| 489 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
| 490 if (rn == NULL) { | |
| 491 return NGX_ERROR; | |
| 492 } | |
| 493 | |
| 494 rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len); | |
| 495 if (rn->name == NULL) { | |
| 496 ngx_resolver_free(r, rn); | |
| 497 return NGX_ERROR; | |
| 498 } | |
| 499 | |
| 500 rn->node.key = hash; | |
| 501 rn->nlen = (u_short) ctx->name.len; | |
|
1960
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fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
502 rn->query = NULL; |
| 1649 | 503 |
| 504 ngx_rbtree_insert(&r->name_rbtree, &rn->node); | |
| 505 } | |
| 506 | |
|
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
507 rc = ngx_resolver_create_name_query(rn, ctx); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
508 |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
509 if (rc == NGX_ERROR) { |
| 1649 | 510 goto failed; |
| 511 } | |
| 512 | |
|
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
513 if (rc == NGX_DECLINED) { |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
514 ngx_rbtree_delete(&r->name_rbtree, &rn->node); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
515 |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
516 ngx_resolver_free(r, rn->query); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
517 ngx_resolver_free(r, rn->name); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
518 ngx_resolver_free(r, rn); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
519 |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
520 ctx->state = NGX_RESOLVE_NXDOMAIN; |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
521 ctx->handler(ctx); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
522 |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
523 return NGX_OK; |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
524 } |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
525 |
| 1649 | 526 if (ngx_resolver_send_query(r, rn) != NGX_OK) { |
| 527 goto failed; | |
| 528 } | |
| 529 | |
| 530 if (ctx->event == NULL) { | |
| 531 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
| 532 if (ctx->event == NULL) { | |
| 533 goto failed; | |
| 534 } | |
| 535 | |
| 536 ctx->event->handler = ngx_resolver_timeout_handler; | |
| 537 ctx->event->data = ctx; | |
| 538 ctx->event->log = r->log; | |
| 539 ctx->ident = -1; | |
| 540 | |
| 541 ngx_add_timer(ctx->event, ctx->timeout); | |
| 542 } | |
| 543 | |
| 544 if (ngx_queue_empty(&r->name_resend_queue)) { | |
| 545 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
| 546 } | |
| 547 | |
| 548 rn->expire = ngx_time() + r->resend_timeout; | |
| 549 | |
| 550 ngx_queue_insert_head(&r->name_resend_queue, &rn->queue); | |
| 551 | |
| 552 rn->cnlen = 0; | |
| 553 rn->naddrs = 0; | |
| 554 rn->valid = 0; | |
| 555 rn->waiting = ctx; | |
| 556 | |
| 557 ctx->state = NGX_AGAIN; | |
| 558 | |
| 559 return NGX_AGAIN; | |
| 560 | |
| 561 failed: | |
| 562 | |
| 563 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 564 | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
565 if (rn->query) { |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
566 ngx_resolver_free(r, rn->query); |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
567 } |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
568 |
| 1649 | 569 ngx_resolver_free(r, rn->name); |
| 570 | |
| 571 ngx_resolver_free(r, rn); | |
| 572 | |
| 573 return NGX_ERROR; | |
| 574 } | |
| 583 | 575 |
| 576 | |
| 577 ngx_int_t | |
| 1649 | 578 ngx_resolve_addr(ngx_resolver_ctx_t *ctx) |
| 579 { | |
|
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
580 u_char *name; |
| 1649 | 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 | |
|
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
604 name = ngx_resolver_dup(r, rn->name, rn->nlen); |
|
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
605 if (name == NULL) { |
| 1649 | 606 goto failed; |
| 607 } | |
| 608 | |
|
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
609 ctx->name.len = rn->nlen; |
|
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
610 ctx->name.data = name; |
|
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
611 |
| 1649 | 612 /* unlock addr mutex */ |
| 613 | |
| 614 ctx->state = NGX_OK; | |
| 615 | |
| 616 ctx->handler(ctx); | |
| 617 | |
|
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
618 ngx_resolver_free(r, name); |
| 1649 | 619 |
| 620 return NGX_OK; | |
| 621 } | |
| 622 | |
| 623 if (rn->waiting) { | |
| 624 | |
| 625 ctx->next = rn->waiting; | |
| 626 rn->waiting = ctx; | |
| 3297 | 627 ctx->state = NGX_AGAIN; |
| 1649 | 628 |
|
2487
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
629 /* unlock addr mutex */ |
|
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
630 |
|
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
631 return NGX_OK; |
| 1649 | 632 } |
| 633 | |
| 634 ngx_queue_remove(&rn->queue); | |
| 635 | |
| 636 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
|
637 rn->query = NULL; |
| 1649 | 638 |
| 639 } else { | |
| 640 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
| 641 if (rn == NULL) { | |
| 642 goto failed; | |
| 643 } | |
| 644 | |
| 645 rn->node.key = ctx->addr; | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
646 rn->query = NULL; |
| 1649 | 647 |
| 648 ngx_rbtree_insert(&r->addr_rbtree, &rn->node); | |
| 649 } | |
| 650 | |
| 651 if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) { | |
| 652 goto failed; | |
| 653 } | |
| 654 | |
| 655 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
| 656 goto failed; | |
| 657 } | |
| 658 | |
| 659 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
| 660 if (ctx->event == NULL) { | |
| 661 goto failed; | |
| 662 } | |
| 663 | |
| 664 ctx->event->handler = ngx_resolver_timeout_handler; | |
| 665 ctx->event->data = ctx; | |
| 666 ctx->event->log = r->log; | |
| 667 ctx->ident = -1; | |
| 668 | |
| 669 ngx_add_timer(ctx->event, ctx->timeout); | |
| 670 | |
| 671 if (ngx_queue_empty(&r->addr_resend_queue)) { | |
| 672 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
| 673 } | |
| 674 | |
| 675 rn->expire = ngx_time() + r->resend_timeout; | |
| 676 | |
| 677 ngx_queue_insert_head(&r->addr_resend_queue, &rn->queue); | |
| 678 | |
| 679 rn->cnlen = 0; | |
| 680 rn->naddrs = 0; | |
| 681 rn->name = NULL; | |
| 682 rn->nlen = 0; | |
| 683 rn->valid = 0; | |
| 684 rn->waiting = ctx; | |
| 685 | |
| 686 /* unlock addr mutex */ | |
| 687 | |
| 688 ctx->state = NGX_AGAIN; | |
| 689 | |
| 690 return NGX_OK; | |
| 691 | |
| 692 failed: | |
| 693 | |
| 694 if (rn) { | |
| 695 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 696 | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
697 if (rn->query) { |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
698 ngx_resolver_free(r, rn->query); |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
699 } |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
700 |
| 1649 | 701 ngx_resolver_free(r, rn); |
| 702 } | |
| 703 | |
| 704 /* unlock addr mutex */ | |
| 705 | |
| 706 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
|
707 ngx_resolver_free(r, ctx->event); |
| 1649 | 708 } |
| 709 | |
|
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
710 ngx_resolver_free(r, ctx); |
| 1649 | 711 |
| 712 return NGX_ERROR; | |
| 713 } | |
| 714 | |
| 715 | |
| 716 void | |
| 717 ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx) | |
| 718 { | |
| 719 in_addr_t addr; | |
| 720 ngx_resolver_t *r; | |
| 721 ngx_resolver_ctx_t *w, **p; | |
| 722 ngx_resolver_node_t *rn; | |
| 723 | |
| 724 r = ctx->resolver; | |
| 725 | |
| 726 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 727 "resolve addr done: %i", ctx->state); | |
| 728 | |
| 729 if (ctx->event && ctx->event->timer_set) { | |
| 730 ngx_del_timer(ctx->event); | |
| 731 } | |
| 732 | |
| 733 /* lock addr mutex */ | |
| 734 | |
| 735 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
| 736 | |
| 737 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
| 738 | |
| 739 if (rn) { | |
| 740 p = &rn->waiting; | |
| 741 w = rn->waiting; | |
| 742 | |
| 743 while (w) { | |
| 744 if (w == ctx) { | |
| 745 *p = w->next; | |
| 746 | |
| 747 goto done; | |
| 748 } | |
| 749 | |
| 750 p = &w->next; | |
| 751 w = w->next; | |
| 752 } | |
| 753 } | |
| 754 | |
| 755 addr = ntohl(ctx->addr); | |
| 756 | |
| 757 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
| 758 "could not cancel %ud.%ud.%ud.%ud resolving", | |
| 759 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 760 (addr >> 8) & 0xff, addr & 0xff); | |
| 761 } | |
| 762 | |
| 763 done: | |
| 764 | |
| 765 ngx_resolver_expire(r, &r->addr_rbtree, &r->addr_expire_queue); | |
| 766 | |
| 767 /* unlock addr mutex */ | |
| 768 | |
|
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
769 /* 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
|
770 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
771 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
|
772 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
|
773 } |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
774 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
775 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
|
776 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
777 /* unlock alloc mutex */ |
| 1649 | 778 } |
| 779 | |
| 780 | |
| 781 static void | |
| 782 ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 783 { | |
| 784 time_t now; | |
| 785 ngx_uint_t i; | |
| 786 ngx_queue_t *q; | |
| 787 ngx_resolver_node_t *rn; | |
| 788 | |
| 789 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire"); | |
| 790 | |
| 791 now = ngx_time(); | |
| 792 | |
| 793 for (i = 0; i < 2; i++) { | |
| 794 if (ngx_queue_empty(queue)) { | |
| 795 return; | |
| 796 } | |
| 797 | |
| 798 q = ngx_queue_last(queue); | |
| 799 | |
| 800 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 801 | |
| 802 if (now <= rn->expire) { | |
| 803 return; | |
| 804 } | |
| 805 | |
| 1774 | 806 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, |
| 807 "resolver expire \"%*s\"", (size_t) rn->nlen, rn->name); | |
| 1649 | 808 |
| 809 ngx_queue_remove(q); | |
| 810 | |
| 811 ngx_rbtree_delete(tree, &rn->node); | |
| 812 | |
| 813 ngx_resolver_free_node(r, rn); | |
| 814 } | |
| 815 } | |
| 816 | |
| 817 | |
| 818 static ngx_int_t | |
| 819 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 820 { | |
| 821 ssize_t n; | |
| 822 ngx_udp_connection_t *uc; | |
| 823 | |
| 824 uc = r->udp_connection; | |
| 825 | |
| 826 if (uc->connection == NULL) { | |
| 827 if (ngx_udp_connect(uc) != NGX_OK) { | |
| 828 return NGX_ERROR; | |
| 829 } | |
| 830 | |
| 831 uc->connection->data = r; | |
| 832 uc->connection->read->handler = ngx_resolver_read_response; | |
| 1906 | 833 uc->connection->read->resolver = 1; |
| 1649 | 834 } |
| 835 | |
| 836 n = ngx_send(uc->connection, rn->query, rn->qlen); | |
| 837 | |
| 838 if (n == -1) { | |
| 839 return NGX_ERROR; | |
| 840 } | |
| 841 | |
| 842 if ((size_t) n != (size_t) rn->qlen) { | |
| 843 ngx_log_error(NGX_LOG_CRIT, uc->log, 0, "send() incomplete"); | |
| 844 return NGX_ERROR; | |
| 845 } | |
| 846 | |
| 847 return NGX_OK; | |
| 848 } | |
| 849 | |
| 850 | |
| 851 static void | |
| 852 ngx_resolver_resend_handler(ngx_event_t *ev) | |
| 853 { | |
| 854 time_t timer, atimer, ntimer; | |
| 855 ngx_resolver_t *r; | |
| 856 | |
| 857 r = ev->data; | |
| 858 | |
| 859 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 860 "resolver resend handler"); | |
| 861 | |
| 862 /* lock name mutex */ | |
| 863 | |
| 864 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue); | |
| 865 | |
| 866 /* unlock name mutex */ | |
| 867 | |
| 868 /* lock addr mutex */ | |
| 869 | |
| 870 atimer = ngx_resolver_resend(r, &r->addr_rbtree, &r->addr_resend_queue); | |
|
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|
871 |
| 1649 | 872 /* unlock addr mutex */ |
| 873 | |
| 874 if (ntimer == 0) { | |
| 875 timer = atimer; | |
| 876 | |
| 877 } else if (atimer == 0) { | |
| 878 timer = ntimer; | |
| 879 | |
| 880 } else { | |
| 881 timer = (atimer < ntimer) ? atimer : ntimer; | |
| 882 } | |
| 883 | |
| 884 if (timer) { | |
| 885 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000)); | |
| 886 } | |
| 887 } | |
| 888 | |
| 889 | |
| 890 static time_t | |
| 891 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 892 { | |
| 893 time_t now; | |
| 894 ngx_queue_t *q; | |
| 895 ngx_resolver_node_t *rn; | |
| 896 | |
| 897 now = ngx_time(); | |
| 898 | |
| 899 for ( ;; ) { | |
| 900 if (ngx_queue_empty(queue)) { | |
| 901 return 0; | |
| 902 } | |
| 903 | |
| 904 q = ngx_queue_last(queue); | |
| 905 | |
| 906 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 907 | |
| 908 if (now < rn->expire) { | |
| 909 return rn->expire - now; | |
| 910 } | |
| 911 | |
| 1774 | 912 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, |
| 913 "resolver resend \"%*s\" %p", | |
| 914 (size_t) rn->nlen, rn->name, rn->waiting); | |
| 1649 | 915 |
| 916 ngx_queue_remove(q); | |
| 917 | |
| 918 if (rn->waiting) { | |
| 919 | |
| 920 if (ngx_resolver_send_query(r, rn) == NGX_OK) { | |
| 921 | |
| 922 rn->expire = now + r->resend_timeout; | |
| 923 | |
| 924 ngx_queue_insert_head(queue, &rn->queue); | |
| 925 } | |
|
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|
926 |
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|
927 continue; |
| 1649 | 928 } |
| 929 | |
| 930 ngx_rbtree_delete(tree, &rn->node); | |
| 931 | |
| 932 ngx_resolver_free_node(r, rn); | |
| 933 } | |
| 934 } | |
| 935 | |
| 936 | |
| 937 static void | |
| 938 ngx_resolver_read_response(ngx_event_t *rev) | |
| 939 { | |
| 940 ssize_t n; | |
| 941 ngx_connection_t *c; | |
| 942 u_char buf[NGX_RESOLVER_UDP_SIZE]; | |
| 943 | |
| 944 c = rev->data; | |
| 945 | |
| 946 do { | |
| 1689 | 947 n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE); |
| 948 | |
| 949 if (n < 0) { | |
| 1649 | 950 return; |
| 951 } | |
| 952 | |
| 953 ngx_resolver_process_response(c->data, buf, n); | |
| 954 | |
| 955 } while (rev->ready); | |
| 956 } | |
| 957 | |
| 958 | |
| 959 static void | |
| 960 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n) | |
| 961 { | |
| 962 char *err; | |
| 963 size_t len; | |
|
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964 ngx_uint_t i, times, ident, qident, flags, code, nqs, nan, |
|
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|
965 qtype, qclass; |
|
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|
966 ngx_queue_t *q; |
| 1649 | 967 ngx_resolver_qs_t *qs; |
|
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|
968 ngx_resolver_node_t *rn; |
| 1649 | 969 ngx_resolver_query_t *query; |
| 970 | |
|
2281
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diff
changeset
|
971 if ((size_t) n < sizeof(ngx_resolver_query_t)) { |
| 1649 | 972 goto short_response; |
| 973 } | |
| 974 | |
| 975 query = (ngx_resolver_query_t *) buf; | |
| 976 | |
| 977 ident = (query->ident_hi << 8) + query->ident_lo; | |
| 978 flags = (query->flags_hi << 8) + query->flags_lo; | |
| 979 nqs = (query->nqs_hi << 8) + query->nqs_lo; | |
| 980 nan = (query->nan_hi << 8) + query->nan_lo; | |
| 981 | |
| 982 ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0, | |
|
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diff
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|
983 "resolver DNS response %ui fl:%04Xui %ui/%ui/%ui/%ui", |
| 1649 | 984 ident, flags, nqs, nan, |
| 985 (query->nns_hi << 8) + query->nns_lo, | |
| 986 (query->nar_hi << 8) + query->nar_lo); | |
| 987 | |
| 988 if (!(flags & 0x8000)) { | |
| 989 ngx_log_error(r->log_level, r->log, 0, | |
|
1967
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diff
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|
990 "invalid DNS response %ui fl:%04Xui", ident, flags); |
| 1649 | 991 return; |
| 992 } | |
| 993 | |
| 994 code = flags & 0x7f; | |
| 995 | |
|
2282
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|
996 if (code == NGX_RESOLVE_FORMERR) { |
|
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|
997 |
|
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|
998 times = 0; |
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999 |
|
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1000 for (q = ngx_queue_head(&r->name_resend_queue); |
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1001 q != ngx_queue_sentinel(&r->name_resend_queue) || times++ < 100; |
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1002 q = ngx_queue_next(q)) |
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1003 { |
|
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1004 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); |
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|
1005 qident = (rn->query[0] << 8) + rn->query[1]; |
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|
1006 |
|
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|
1007 if (qident == ident) { |
|
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1008 ngx_log_error(r->log_level, r->log, 0, |
|
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|
1009 "DNS error (%ui: %s), query id:%ui, name:\"%*s\"", |
|
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diff
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|
1010 code, ngx_resolver_strerror(code), ident, |
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1011 rn->nlen, rn->name); |
|
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diff
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|
1012 return; |
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1013 } |
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|
1014 } |
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|
1015 |
|
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1016 goto dns_error; |
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|
1017 } |
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1018 |
|
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diff
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|
1019 if (code > NGX_RESOLVE_REFUSED) { |
|
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diff
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|
1020 goto dns_error; |
| 1649 | 1021 } |
| 1022 | |
| 1023 if (nqs != 1) { | |
| 1024 err = "invalid number of questions in DNS response"; | |
| 1025 goto done; | |
| 1026 } | |
| 1027 | |
| 1028 i = sizeof(ngx_resolver_query_t); | |
| 1029 | |
| 1030 while (i < (ngx_uint_t) n) { | |
| 1031 if (buf[i] == '\0') { | |
| 1032 goto found; | |
| 1033 } | |
| 1034 | |
| 1035 len = buf[i]; | |
| 1036 i += 1 + len; | |
| 1037 } | |
| 1038 | |
| 1039 goto short_response; | |
| 1040 | |
| 1041 found: | |
| 1042 | |
| 1043 if (i++ == 0) { | |
| 1044 err = "zero-length domain name in DNS response"; | |
| 1045 goto done; | |
| 1046 } | |
| 1047 | |
| 1048 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t)) | |
| 1049 > (ngx_uint_t) n) | |
| 1050 { | |
| 1051 goto short_response; | |
| 1052 } | |
| 1053 | |
| 1054 qs = (ngx_resolver_qs_t *) &buf[i]; | |
| 1055 | |
| 1056 qtype = (qs->type_hi << 8) + qs->type_lo; | |
| 1057 qclass = (qs->class_hi << 8) + qs->class_lo; | |
| 1058 | |
| 1059 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
|
1967
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1966
diff
changeset
|
1060 "resolver DNS response qt:%ui cl:%ui", qtype, qclass); |
| 1649 | 1061 |
| 1062 if (qclass != 1) { | |
| 1063 ngx_log_error(r->log_level, r->log, 0, | |
|
1967
4a4b15c9c474
use correct ngx_sprintf() formats
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parents:
1966
diff
changeset
|
1064 "unknown query class %ui in DNS response", qclass); |
| 1649 | 1065 return; |
| 1066 } | |
| 1067 | |
| 1068 switch (qtype) { | |
| 1069 | |
| 1070 case NGX_RESOLVE_A: | |
| 1071 | |
| 1072 ngx_resolver_process_a(r, buf, n, ident, code, nan, | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
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1741
diff
changeset
|
1073 i + sizeof(ngx_resolver_qs_t)); |
| 1649 | 1074 |
| 1075 break; | |
| 1076 | |
| 1077 case NGX_RESOLVE_PTR: | |
| 1078 | |
|
1742
268b81386fe4
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diff
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|
1079 ngx_resolver_process_ptr(r, buf, n, ident, code, nan); |
| 1649 | 1080 |
| 1081 break; | |
| 1082 | |
| 1083 default: | |
| 1084 ngx_log_error(r->log_level, r->log, 0, | |
|
1967
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parents:
1966
diff
changeset
|
1085 "unknown query type %ui in DNS response", qtype); |
| 1649 | 1086 return; |
| 1087 } | |
| 1088 | |
| 1089 return; | |
| 1090 | |
| 1091 short_response: | |
| 1092 | |
| 1093 err = "short dns response"; | |
| 1094 | |
| 1095 done: | |
| 1096 | |
| 1097 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1098 | |
| 1099 return; | |
|
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|
1100 |
|
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|
1101 dns_error: |
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|
1102 |
|
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|
1103 ngx_log_error(r->log_level, r->log, 0, |
|
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diff
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|
1104 "DNS error (%ui: %s), query id:%ui", |
|
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|
1105 code, ngx_resolver_strerror(code), ident); |
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diff
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|
1106 return; |
| 1649 | 1107 } |
| 1108 | |
| 1109 | |
| 1110 static void | |
| 1111 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last, | |
| 1112 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans) | |
| 583 | 1113 { |
| 1649 | 1114 char *err; |
| 1115 u_char *cname; | |
| 1116 size_t len; | |
| 1117 uint32_t hash; | |
| 1118 in_addr_t addr, *addrs; | |
| 1119 ngx_str_t name; | |
| 1120 ngx_uint_t qtype, qident, naddrs, a, i, n, start; | |
| 1121 ngx_resolver_an_t *an; | |
| 1122 ngx_resolver_ctx_t *ctx, *next; | |
| 1123 ngx_resolver_node_t *rn; | |
| 1124 | |
| 1125 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) { | |
| 1126 return; | |
| 1127 } | |
| 1128 | |
| 1129 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); | |
| 1130 | |
| 1131 hash = ngx_crc32_short(name.data, name.len); | |
| 1132 | |
| 1133 /* lock name mutex */ | |
| 1134 | |
| 1135 rn = ngx_resolver_lookup_name(r, &name, hash); | |
| 1136 | |
| 1137 if (rn == NULL || rn->query == NULL) { | |
| 1138 ngx_log_error(r->log_level, r->log, 0, | |
| 1139 "unexpected response for %V", &name); | |
| 1140 goto failed; | |
| 1141 } | |
| 1142 | |
| 1143 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 1144 | |
| 1145 if (ident != qident) { | |
| 1146 ngx_log_error(r->log_level, r->log, 0, | |
|
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parents:
1966
diff
changeset
|
1147 "wrong ident %ui response for %V, expect %ui", |
| 1649 | 1148 ident, &name, qident); |
| 1149 goto failed; | |
| 1150 } | |
| 1151 | |
| 3139 | 1152 ngx_resolver_free(r, name.data); |
| 1153 | |
|
1742
268b81386fe4
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1741
diff
changeset
|
1154 if (code == 0 && nan == 0) { |
|
268b81386fe4
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1741
diff
changeset
|
1155 code = 3; /* NXDOMAIN */ |
|
268b81386fe4
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parents:
1741
diff
changeset
|
1156 } |
|
268b81386fe4
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1741
diff
changeset
|
1157 |
| 1649 | 1158 if (code) { |
| 1159 next = rn->waiting; | |
| 1160 rn->waiting = NULL; | |
| 1161 | |
| 1162 ngx_queue_remove(&rn->queue); | |
| 1163 | |
| 1164 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 1165 | |
| 1166 ngx_resolver_free_node(r, rn); | |
| 1167 | |
| 1168 /* unlock name mutex */ | |
| 1169 | |
| 1170 while (next) { | |
| 1171 ctx = next; | |
| 1172 ctx->state = code; | |
| 1173 next = ctx->next; | |
| 1174 | |
| 1175 ctx->handler(ctx); | |
| 1176 } | |
| 1177 | |
| 1178 return; | |
| 1179 } | |
| 1180 | |
| 1181 i = ans; | |
| 1182 naddrs = 0; | |
| 1183 addr = 0; | |
| 1184 addrs = NULL; | |
| 1185 cname = NULL; | |
| 1186 qtype = 0; | |
| 1187 | |
| 1188 for (a = 0; a < nan; a++) { | |
| 1189 | |
| 1190 start = i; | |
| 1191 | |
| 1192 while (i < last) { | |
| 1193 | |
| 1194 if (buf[i] & 0xc0) { | |
| 1195 i += 2; | |
| 1196 goto found; | |
| 1197 } | |
| 1198 | |
| 1199 if (buf[i] == 0) { | |
| 1200 i++; | |
| 1201 goto test_length; | |
| 1202 } | |
| 1203 | |
| 1204 i += 1 + buf[i]; | |
| 1205 } | |
| 1206 | |
| 1207 goto short_response; | |
| 1208 | |
| 1209 test_length: | |
| 1210 | |
| 1211 if (i - start < 2) { | |
| 1212 err = "invalid name in dns response"; | |
| 1213 goto invalid; | |
| 1214 } | |
| 1215 | |
| 1216 found: | |
| 1217 | |
| 1218 if (i + sizeof(ngx_resolver_an_t) >= last) { | |
| 1219 goto short_response; | |
| 1220 } | |
| 1221 | |
| 1222 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1223 | |
| 1224 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1225 len = (an->len_hi << 8) + an->len_lo; | |
| 1226 | |
| 1227 if (qtype == NGX_RESOLVE_A) { | |
| 1228 | |
| 1229 i += sizeof(ngx_resolver_an_t); | |
| 1230 | |
| 1231 if (i + len > last) { | |
| 1232 goto short_response; | |
| 1233 } | |
| 1234 | |
| 1235 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1236 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1237 | |
| 1238 naddrs++; | |
| 1239 | |
| 1240 i += len; | |
| 1241 | |
| 1242 } else if (qtype == NGX_RESOLVE_CNAME) { | |
| 1243 cname = &buf[i] + sizeof(ngx_resolver_an_t); | |
| 1244 i += sizeof(ngx_resolver_an_t) + len; | |
| 1965 | 1245 |
| 1246 } else if (qtype == NGX_RESOLVE_DNAME) { | |
| 1247 i += sizeof(ngx_resolver_an_t) + len; | |
| 1966 | 1248 |
| 1249 } else { | |
| 1250 ngx_log_error(r->log_level, r->log, 0, | |
| 1251 "unexpected qtype %ui", qtype); | |
| 1649 | 1252 } |
| 1253 } | |
| 1254 | |
| 1255 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1256 "resolver naddrs:%ui cname:%p", naddrs, cname); | |
| 1257 | |
| 1258 if (naddrs) { | |
| 1259 | |
| 1260 if (naddrs == 1) { | |
| 1261 rn->u.addr = addr; | |
| 1262 | |
| 1263 } else { | |
| 1264 | |
| 1265 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t)); | |
| 1266 if (addrs == NULL) { | |
| 1267 return; | |
| 1268 } | |
| 1269 | |
| 1270 n = 0; | |
| 1271 i = ans; | |
| 1272 | |
| 1273 for (a = 0; a < nan; a++) { | |
| 1274 | |
| 1275 for ( ;; ) { | |
| 1276 | |
| 1277 if (buf[i] & 0xc0) { | |
| 1278 i += 2; | |
| 1279 goto ok; | |
| 1280 } | |
| 1281 | |
| 1282 if (buf[i] == 0) { | |
| 1283 i++; | |
| 1284 goto ok; | |
| 1285 } | |
| 1286 | |
| 1287 i += 1 + buf[i]; | |
| 1288 } | |
| 1289 | |
| 1290 ok: | |
| 1291 | |
| 1292 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1293 | |
| 1294 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1295 len = (an->len_hi << 8) + an->len_lo; | |
| 1296 | |
| 1297 i += sizeof(ngx_resolver_an_t); | |
| 1298 | |
| 1299 if (qtype == NGX_RESOLVE_A) { | |
| 1300 | |
| 1301 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1302 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1303 | |
| 1304 if (n == naddrs) { | |
| 1305 break; | |
| 1306 } | |
| 1307 } | |
| 1308 | |
| 1309 i += len; | |
| 1310 } | |
| 1311 | |
| 1312 rn->u.addrs = addrs; | |
| 1313 | |
| 1314 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
| 1315 naddrs * sizeof(in_addr_t)); | |
| 1316 if (addrs == NULL) { | |
| 1317 return; | |
| 1318 } | |
| 1319 } | |
| 1320 | |
| 1321 rn->naddrs = (u_short) naddrs; | |
| 1322 | |
| 1323 ngx_queue_remove(&rn->queue); | |
| 1324 | |
| 1325 rn->valid = ngx_time() + r->valid; | |
| 1326 rn->expire = ngx_time() + r->expire; | |
| 1327 | |
| 1328 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1329 | |
| 1330 next = rn->waiting; | |
| 1331 rn->waiting = NULL; | |
| 1332 | |
| 1333 /* unlock name mutex */ | |
| 1334 | |
| 1335 while (next) { | |
| 1336 ctx = next; | |
| 1337 ctx->state = NGX_OK; | |
| 1338 ctx->naddrs = naddrs; | |
| 1339 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 1340 ctx->addr = addr; | |
| 1341 next = ctx->next; | |
| 1342 | |
| 1343 ctx->handler(ctx); | |
| 1344 } | |
| 1345 | |
|
2483
29494780d978
free addrs only it has been allocated before: non single address
Igor Sysoev <igor@sysoev.ru>
parents:
2482
diff
changeset
|
1346 if (naddrs > 1) { |
| 1649 | 1347 ngx_resolver_free(r, addrs); |
| 1348 } | |
| 1349 | |
| 1350 return; | |
| 1351 | |
| 1352 } else if (cname) { | |
| 1353 | |
| 1354 /* CNAME only */ | |
| 1355 | |
| 1356 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) { | |
| 1357 return; | |
| 1358 } | |
| 1359 | |
| 1360 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1361 "resolver cname:\"%V\"", &name); | |
| 1362 | |
|
1741
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1363 ngx_queue_remove(&rn->queue); |
|
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1364 |
| 1649 | 1365 rn->cnlen = (u_short) name.len; |
| 1366 rn->u.cname = name.data; | |
| 1367 rn->valid = ngx_time() + r->valid; | |
| 1368 rn->expire = ngx_time() + r->expire; | |
| 1369 | |
| 1370 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1371 | |
| 1372 ctx = rn->waiting; | |
| 1373 rn->waiting = NULL; | |
| 1374 | |
| 1375 if (ctx) { | |
| 1376 ctx->name = name; | |
| 1377 | |
| 1378 (void) ngx_resolve_name_locked(r, ctx); | |
| 1379 } | |
| 1380 | |
| 1381 return; | |
| 1382 } | |
| 1383 | |
| 1384 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
|
1385 "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
|
1386 qtype); |
| 1649 | 1387 return; |
| 1388 | |
| 1389 short_response: | |
| 1390 | |
| 1391 err = "short dns response"; | |
| 1392 | |
| 1393 invalid: | |
| 1394 | |
| 1395 /* unlock name mutex */ | |
| 1396 | |
| 1397 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1398 | |
| 1399 return; | |
| 1400 | |
| 1401 failed: | |
| 1402 | |
| 1403 /* unlock name mutex */ | |
| 1404 | |
| 3139 | 1405 ngx_resolver_free(r, name.data); |
| 1406 | |
| 1649 | 1407 return; |
| 1408 } | |
| 1409 | |
| 1410 | |
| 1411 static void | |
| 1412 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
|
1413 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan) |
| 1649 | 1414 { |
| 1415 char *err; | |
| 1416 size_t len; | |
| 1417 in_addr_t addr; | |
| 1418 ngx_int_t digit; | |
| 1419 ngx_str_t name; | |
| 1420 ngx_uint_t i, mask, qtype, qclass, qident; | |
| 1421 ngx_resolver_an_t *an; | |
| 1422 ngx_resolver_ctx_t *ctx, *next; | |
| 1423 ngx_resolver_node_t *rn; | |
| 1424 | |
| 1425 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) { | |
| 1426 goto invalid_in_addr_arpa; | |
| 1427 } | |
| 1428 | |
| 1429 addr = 0; | |
| 1430 i = 12; | |
| 1431 | |
| 1432 for (mask = 0; mask < 32; mask += 8) { | |
| 1433 len = buf[i++]; | |
| 1434 | |
| 1435 digit = ngx_atoi(&buf[i], len); | |
| 1436 if (digit == NGX_ERROR || digit > 255) { | |
| 1437 goto invalid_in_addr_arpa; | |
| 1438 } | |
| 1439 | |
| 1440 addr += digit << mask; | |
| 1441 i += len; | |
| 1442 } | |
| 1443 | |
| 1444 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) { | |
| 1445 goto invalid_in_addr_arpa; | |
| 1446 } | |
| 1447 | |
| 1448 /* lock addr mutex */ | |
| 1449 | |
| 1450 rn = ngx_resolver_lookup_addr(r, addr); | |
| 1451 | |
| 1452 if (rn == NULL || rn->query == NULL) { | |
| 1453 ngx_log_error(r->log_level, r->log, 0, | |
| 1454 "unexpected response for %ud.%ud.%ud.%ud", | |
| 1455 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 1456 (addr >> 8) & 0xff, addr & 0xff); | |
| 1457 goto failed; | |
| 1458 } | |
| 1459 | |
| 1460 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 1461 | |
| 1462 if (ident != qident) { | |
| 1463 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
|
1464 "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
|
1465 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff, |
|
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1466 (addr >> 8) & 0xff, addr & 0xff, qident); |
| 1649 | 1467 goto failed; |
| 1468 } | |
| 1469 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1470 if (code == 0 && nan == 0) { |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1471 code = 3; /* NXDOMAIN */ |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1472 } |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1473 |
| 1649 | 1474 if (code) { |
| 1475 next = rn->waiting; | |
| 1476 rn->waiting = NULL; | |
| 1477 | |
| 1478 ngx_queue_remove(&rn->queue); | |
| 1479 | |
| 1480 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 1481 | |
| 1482 ngx_resolver_free_node(r, rn); | |
| 1483 | |
| 1484 /* unlock addr mutex */ | |
| 1485 | |
| 1486 while (next) { | |
| 1487 ctx = next; | |
| 1488 ctx->state = code; | |
| 1489 next = ctx->next; | |
| 1490 | |
| 1491 ctx->handler(ctx); | |
| 1492 } | |
| 1493 | |
| 1494 return; | |
| 1495 } | |
| 1496 | |
| 1497 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t); | |
| 1498 | |
| 1499 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) { | |
| 1500 goto short_response; | |
| 1501 } | |
| 1502 | |
| 1503 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */ | |
| 1504 | |
| 1505 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) { | |
| 1506 err = "invalid in-addr.arpa name in DNS response"; | |
| 1507 goto invalid; | |
| 1508 } | |
| 1509 | |
| 1510 an = (ngx_resolver_an_t *) &buf[i + 2]; | |
| 1511 | |
| 1512 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1513 qclass = (an->class_hi << 8) + an->class_lo; | |
| 1514 len = (an->len_hi << 8) + an->len_lo; | |
| 1515 | |
| 1516 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
|
1517 "resolver qt:%ui cl:%ui len:%uz", qtype, qclass, len); |
| 1649 | 1518 |
| 1519 i += 2 + sizeof(ngx_resolver_an_t); | |
| 1520 | |
| 1521 if (i + len > (ngx_uint_t) n) { | |
| 1522 goto short_response; | |
| 1523 } | |
| 1524 | |
| 1525 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) { | |
| 1526 return; | |
| 1527 } | |
| 1528 | |
| 1529 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name); | |
| 1530 | |
|
2486
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1531 if (name.len != (size_t) rn->nlen |
|
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1532 || ngx_strncmp(name.data, rn->name, name.len) != 0) |
| 1649 | 1533 { |
|
2482
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1534 if (rn->nlen) { |
|
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1535 ngx_resolver_free(r, rn->name); |
|
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1536 } |
|
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1537 |
|
2490
1c87647b7ca5
fix building by msvc, introduced in r2487
Igor Sysoev <igor@sysoev.ru>
parents:
2487
diff
changeset
|
1538 rn->nlen = (u_short) name.len; |
| 1649 | 1539 rn->name = name.data; |
| 1540 | |
|
2486
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1541 name.data = ngx_resolver_dup(r, rn->name, name.len); |
| 1649 | 1542 if (name.data == NULL) { |
| 1543 goto failed; | |
| 1544 } | |
| 1545 } | |
| 1546 | |
| 1547 ngx_queue_remove(&rn->queue); | |
| 1548 | |
| 1549 rn->valid = ngx_time() + r->valid; | |
| 1550 rn->expire = ngx_time() + r->expire; | |
| 1551 | |
| 1552 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
| 1553 | |
| 1554 next = rn->waiting; | |
| 1555 rn->waiting = NULL; | |
| 1556 | |
| 1557 /* unlock addr mutex */ | |
| 1558 | |
| 1559 while (next) { | |
| 1560 ctx = next; | |
| 1561 ctx->state = NGX_OK; | |
| 1562 ctx->name = name; | |
| 1563 next = ctx->next; | |
| 1564 | |
| 1565 ctx->handler(ctx); | |
| 1566 } | |
| 1567 | |
| 1568 ngx_resolver_free(r, name.data); | |
| 1569 | |
| 1570 return; | |
| 1571 | |
| 1572 invalid_in_addr_arpa: | |
| 1573 | |
| 1574 ngx_log_error(r->log_level, r->log, 0, | |
| 1575 "invalid in-addr.arpa name in DNS response"); | |
| 1576 return; | |
| 1577 | |
| 1578 short_response: | |
| 1579 | |
| 1580 err = "short DNS response"; | |
| 1581 | |
| 1582 invalid: | |
| 1583 | |
| 1584 /* unlock addr mutex */ | |
| 1585 | |
| 1586 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1587 | |
| 1588 return; | |
| 1589 | |
| 1590 failed: | |
| 1591 | |
| 1592 /* unlock addr mutex */ | |
| 1593 | |
| 1594 return; | |
| 1595 } | |
| 1596 | |
| 1597 | |
| 1598 static ngx_resolver_node_t * | |
| 1599 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) | |
| 1600 { | |
| 1601 ngx_int_t rc; | |
| 1602 ngx_rbtree_node_t *node, *sentinel; | |
| 1603 ngx_resolver_node_t *rn; | |
| 1604 | |
| 1605 node = r->name_rbtree.root; | |
| 1606 sentinel = r->name_rbtree.sentinel; | |
| 1607 | |
| 1608 while (node != sentinel) { | |
| 1609 | |
| 1610 if (hash < node->key) { | |
| 1611 node = node->left; | |
| 1612 continue; | |
| 1613 } | |
| 1614 | |
| 1615 if (hash > node->key) { | |
| 1616 node = node->right; | |
| 1617 continue; | |
| 1618 } | |
| 1619 | |
| 1620 /* hash == node->key */ | |
| 1621 | |
| 1622 do { | |
| 1623 rn = (ngx_resolver_node_t *) node; | |
| 1624 | |
|
3143
ab6258e18099
fix resolver cache rbtree comparison
Igor Sysoev <igor@sysoev.ru>
parents:
3139
diff
changeset
|
1625 rc = ngx_memn2cmp(name->data, rn->name, name->len, rn->nlen); |
| 1649 | 1626 |
| 1627 if (rc == 0) { | |
| 1628 return rn; | |
| 1629 } | |
| 1630 | |
| 1631 node = (rc < 0) ? node->left : node->right; | |
| 1632 | |
| 1633 } while (node != sentinel && hash == node->key); | |
| 1634 | |
| 1635 break; | |
| 1636 } | |
| 1637 | |
| 1638 /* not found */ | |
| 1639 | |
| 1640 return NULL; | |
| 1641 } | |
| 1642 | |
| 1643 | |
| 1644 static ngx_resolver_node_t * | |
| 1645 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr) | |
| 1646 { | |
| 1647 ngx_rbtree_node_t *node, *sentinel; | |
| 1648 | |
| 1649 node = r->addr_rbtree.root; | |
| 1650 sentinel = r->addr_rbtree.sentinel; | |
| 1651 | |
| 1652 while (node != sentinel) { | |
| 1653 | |
| 1654 if (addr < node->key) { | |
| 1655 node = node->left; | |
| 1656 continue; | |
| 1657 } | |
| 1658 | |
| 1659 if (addr > node->key) { | |
| 1660 node = node->right; | |
| 1661 continue; | |
| 1662 } | |
| 1663 | |
| 1664 /* addr == node->key */ | |
| 1665 | |
| 1666 return (ngx_resolver_node_t *) node; | |
| 1667 } | |
| 1668 | |
| 1669 /* not found */ | |
| 1670 | |
| 1671 return NULL; | |
| 1672 } | |
| 1673 | |
| 1674 | |
| 1675 static void | |
| 1676 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
| 1677 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
| 1678 { | |
| 1679 ngx_rbtree_node_t **p; | |
| 1680 ngx_resolver_node_t *rn, *rn_temp; | |
| 1681 | |
| 1682 for ( ;; ) { | |
| 1683 | |
| 1684 if (node->key < temp->key) { | |
| 1685 | |
| 1686 p = &temp->left; | |
| 1687 | |
| 1688 } else if (node->key > temp->key) { | |
| 1689 | |
| 1690 p = &temp->right; | |
| 1691 | |
| 1692 } else { /* node->key == temp->key */ | |
| 1693 | |
| 1694 rn = (ngx_resolver_node_t *) node; | |
| 1695 rn_temp = (ngx_resolver_node_t *) temp; | |
| 1696 | |
|
3143
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|
1697 p = (ngx_memn2cmp(rn->name, rn_temp->name, rn->nlen, rn_temp->nlen) |
|
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|
1698 < 0) ? &temp->left : &temp->right; |
| 1649 | 1699 } |
| 1700 | |
| 1701 if (*p == sentinel) { | |
| 1702 break; | |
| 1703 } | |
| 1704 | |
| 1705 temp = *p; | |
| 1706 } | |
| 1707 | |
| 1708 *p = node; | |
| 1709 node->parent = temp; | |
| 1710 node->left = sentinel; | |
| 1711 node->right = sentinel; | |
| 1712 ngx_rbt_red(node); | |
| 1713 } | |
| 1714 | |
| 1715 | |
| 1716 static ngx_int_t | |
| 1717 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1718 { | |
| 1719 u_char *p, *s; | |
|
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1720 size_t len, nlen; |
| 1649 | 1721 ngx_uint_t ident; |
| 1722 ngx_resolver_qs_t *qs; | |
| 1723 ngx_resolver_query_t *query; | |
| 1724 | |
|
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changeset
|
1725 nlen = ctx->name.len ? (1 + ctx->name.len + 1) : 1; |
|
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changeset
|
1726 |
|
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diff
changeset
|
1727 len = sizeof(ngx_resolver_query_t) + nlen + sizeof(ngx_resolver_qs_t); |
| 1649 | 1728 |
|
3307
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changeset
|
1729 p = ngx_resolver_alloc(ctx->resolver, len); |
| 1649 | 1730 if (p == NULL) { |
| 1731 return NGX_ERROR; | |
| 1732 } | |
| 1733 | |
| 1734 rn->qlen = (u_short) len; | |
| 1735 rn->query = p; | |
| 1736 | |
| 1737 query = (ngx_resolver_query_t *) p; | |
| 1738 | |
| 1739 ident = ngx_random(); | |
| 1740 | |
| 1741 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0, | |
| 1742 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff); | |
| 1743 | |
| 1744 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1745 query->ident_lo = (u_char) (ident & 0xff); | |
| 1746 | |
| 1747 /* recursion query */ | |
| 1748 query->flags_hi = 1; query->flags_lo = 0; | |
| 1749 | |
| 1750 /* one question */ | |
| 1751 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1752 query->nan_hi = 0; query->nan_lo = 0; | |
| 1753 query->nns_hi = 0; query->nns_lo = 0; | |
| 1754 query->nar_hi = 0; query->nar_lo = 0; | |
| 1755 | |
|
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|
1756 p += sizeof(ngx_resolver_query_t) + nlen; |
| 1649 | 1757 |
| 1758 qs = (ngx_resolver_qs_t *) p; | |
| 1759 | |
| 1760 /* query type */ | |
| 1761 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type; | |
| 1762 | |
| 1763 /* IP query class */ | |
| 1764 qs->class_hi = 0; qs->class_lo = 1; | |
| 1765 | |
| 1766 /* convert "www.example.com" to "\3www\7example\3com\0" */ | |
| 1767 | |
| 1768 len = 0; | |
| 1769 p--; | |
| 1770 *p-- = '\0'; | |
| 1771 | |
| 1772 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) { | |
| 1773 if (*s != '.') { | |
| 1774 *p = *s; | |
| 1775 len++; | |
| 1776 | |
| 1777 } else { | |
|
1961
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1960
diff
changeset
|
1778 if (len == 0) { |
|
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diff
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|
1779 return NGX_DECLINED; |
|
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diff
changeset
|
1780 } |
|
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diff
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|
1781 |
| 1649 | 1782 *p = (u_char) len; |
| 1783 len = 0; | |
| 1784 } | |
| 1785 | |
| 1786 p--; | |
| 1787 } | |
| 1788 | |
| 1789 *p = (u_char) len; | |
| 1790 | |
| 1791 return NGX_OK; | |
| 1792 } | |
| 1793 | |
| 1794 | |
| 1795 /* AF_INET only */ | |
| 1796 | |
| 1797 static ngx_int_t | |
| 1798 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1799 { | |
| 1800 u_char *p, *d; | |
| 1801 size_t len; | |
| 1802 ngx_int_t n; | |
| 1803 ngx_uint_t ident; | |
| 1804 ngx_resolver_query_t *query; | |
| 1805 | |
| 1806 len = sizeof(ngx_resolver_query_t) | |
| 1807 + sizeof(".255.255.255.255.in-addr.arpa.") - 1 | |
| 1808 + sizeof(ngx_resolver_qs_t); | |
| 1809 | |
|
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diff
changeset
|
1810 p = ngx_resolver_alloc(ctx->resolver, len); |
| 1649 | 1811 if (p == NULL) { |
| 1812 return NGX_ERROR; | |
| 1813 } | |
| 1814 | |
| 1815 rn->query = p; | |
| 1816 query = (ngx_resolver_query_t *) p; | |
| 1817 | |
| 1818 ident = ngx_random(); | |
| 1819 | |
| 1820 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1821 query->ident_lo = (u_char) (ident & 0xff); | |
| 1822 | |
| 1823 /* recursion query */ | |
| 1824 query->flags_hi = 1; query->flags_lo = 0; | |
| 1825 | |
| 1826 /* one question */ | |
| 1827 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1828 query->nan_hi = 0; query->nan_lo = 0; | |
| 1829 query->nns_hi = 0; query->nns_lo = 0; | |
| 1830 query->nar_hi = 0; query->nar_lo = 0; | |
| 1831 | |
| 1832 p += sizeof(ngx_resolver_query_t); | |
| 1833 | |
| 1834 for (n = 0; n < 32; n += 8){ | |
| 1835 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff); | |
| 1836 *p = (u_char) (d - &p[1]); | |
| 1837 p = d; | |
| 1838 } | |
| 1839 | |
| 1840 /* query type "PTR", IP query class */ | |
| 1841 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18); | |
| 1842 | |
| 1843 rn->qlen = (u_short) | |
| 1844 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t) | |
| 1845 - rn->query); | |
| 1846 | |
| 1847 return NGX_OK; | |
| 1848 } | |
| 1849 | |
| 1850 | |
| 1851 static ngx_int_t | |
| 1852 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src, | |
| 1853 u_char *last) | |
| 1854 { | |
| 1855 char *err; | |
| 1856 u_char *p, *dst; | |
| 1857 ssize_t len; | |
| 1858 ngx_uint_t i, n; | |
| 1859 | |
| 1860 p = src; | |
| 1861 len = -1; | |
| 1862 | |
| 1863 /* | |
| 1864 * compression pointers allow to create endless loop, so we set limit; | |
| 1865 * 128 pointers should be enough to store 255-byte name | |
| 1866 */ | |
| 1867 | |
| 1868 for (i = 0; i < 128; i++) { | |
| 1869 n = *p++; | |
| 1870 | |
| 1871 if (n == 0) { | |
| 1872 goto done; | |
| 1873 } | |
| 1874 | |
| 1875 if (n & 0xc0) { | |
|
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|
1876 n = ((n & 0x3f) << 8) + *p; |
| 1649 | 1877 p = &buf[n]; |
| 1878 | |
| 1879 } else { | |
| 1880 len += 1 + n; | |
| 1881 p = &p[n]; | |
| 1882 } | |
| 1883 | |
| 1884 if (p >= last) { | |
| 1885 err = "name is out of response"; | |
| 1886 goto invalid; | |
| 1887 } | |
| 1888 } | |
| 1889 | |
| 1890 err = "compression pointers loop"; | |
| 1891 | |
| 1892 invalid: | |
| 1893 | |
| 1894 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1895 | |
| 1896 return NGX_ERROR; | |
| 1897 | |
| 1898 done: | |
| 1899 | |
| 1900 if (name == NULL) { | |
| 583 | 1901 return NGX_OK; |
| 1902 } | |
| 1903 | |
|
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diff
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|
1904 if (len == -1) { |
|
847ab5a32307
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diff
changeset
|
1905 name->len = 0; |
|
847ab5a32307
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diff
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|
1906 name->data = NULL; |
|
847ab5a32307
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diff
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|
1907 return NGX_OK; |
|
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diff
changeset
|
1908 } |
|
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|
1909 |
| 1649 | 1910 dst = ngx_resolver_alloc(r, len); |
| 1911 if (dst == NULL) { | |
| 1912 return NGX_ERROR; | |
| 1913 } | |
| 1914 | |
| 1915 name->data = dst; | |
| 1916 | |
| 1917 n = *src++; | |
| 1918 | |
| 1919 for ( ;; ) { | |
| 1920 if (n != 0xc0) { | |
| 1921 ngx_memcpy(dst, src, n); | |
| 1922 dst += n; | |
| 1923 src += n; | |
| 1924 | |
| 1925 n = *src++; | |
| 1926 | |
| 1927 if (n != 0) { | |
| 1928 *dst++ = '.'; | |
| 1929 } | |
| 1930 | |
| 1931 } else { | |
|
2314
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diff
changeset
|
1932 n = ((n & 0x3f) << 8) + *src; |
| 1649 | 1933 src = &buf[n]; |
| 1934 | |
| 1935 n = *src++; | |
| 1936 } | |
| 1937 | |
| 1938 if (n == 0) { | |
| 1939 name->len = dst - name->data; | |
| 1940 return NGX_OK; | |
| 1941 } | |
| 1942 } | |
| 1943 } | |
| 1944 | |
| 1945 | |
| 1946 static void | |
| 1947 ngx_resolver_timeout_handler(ngx_event_t *ev) | |
| 1948 { | |
| 1949 ngx_resolver_ctx_t *ctx; | |
| 1950 | |
| 1951 ctx = ev->data; | |
| 1952 | |
| 1953 ctx->state = NGX_RESOLVE_TIMEDOUT; | |
| 1954 | |
| 1955 ctx->handler(ctx); | |
| 1956 } | |
| 1957 | |
| 1958 | |
| 1959 static void | |
| 1960 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 1961 { | |
| 1962 /* lock alloc mutex */ | |
| 1963 | |
| 1964 if (rn->query) { | |
| 1965 ngx_resolver_free_locked(r, rn->query); | |
| 1966 } | |
| 1967 | |
| 1968 if (rn->name) { | |
| 1969 ngx_resolver_free_locked(r, rn->name); | |
| 1970 } | |
| 1971 | |
| 1972 if (rn->cnlen) { | |
| 1973 ngx_resolver_free_locked(r, rn->u.cname); | |
| 1974 } | |
| 1975 | |
| 1976 if (rn->naddrs > 1) { | |
| 1977 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 1978 } | |
| 1979 | |
| 1980 ngx_resolver_free_locked(r, rn); | |
| 1981 | |
| 1982 /* unlock alloc mutex */ | |
| 1983 } | |
| 1984 | |
| 1985 | |
| 1986 static void * | |
| 1987 ngx_resolver_alloc(ngx_resolver_t *r, size_t size) | |
| 1988 { | |
| 1989 u_char *p; | |
| 1990 | |
| 1991 /* lock alloc mutex */ | |
| 1992 | |
| 1993 p = ngx_alloc(size, r->log); | |
| 1994 | |
| 1995 /* unlock alloc mutex */ | |
| 1996 | |
| 1997 return p; | |
| 1998 } | |
| 1999 | |
| 2000 | |
| 1903 | 2001 static void * |
| 1649 | 2002 ngx_resolver_calloc(ngx_resolver_t *r, size_t size) |
| 2003 { | |
| 2004 u_char *p; | |
| 2005 | |
| 2006 p = ngx_resolver_alloc(r, size); | |
| 2007 | |
| 2008 if (p) { | |
| 2009 ngx_memzero(p, size); | |
| 2010 } | |
| 2011 | |
| 2012 return p; | |
| 2013 } | |
| 2014 | |
| 2015 | |
| 2016 static void | |
| 2017 ngx_resolver_free(ngx_resolver_t *r, void *p) | |
| 2018 { | |
| 2019 /* lock alloc mutex */ | |
| 2020 | |
| 2021 ngx_free(p); | |
| 2022 | |
| 2023 /* unlock alloc mutex */ | |
| 2024 } | |
| 2025 | |
| 2026 | |
| 2027 static void | |
| 2028 ngx_resolver_free_locked(ngx_resolver_t *r, void *p) | |
| 2029 { | |
| 2030 ngx_free(p); | |
| 2031 } | |
| 2032 | |
| 2033 | |
| 2034 static void * | |
| 2035 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size) | |
| 2036 { | |
| 2037 void *dst; | |
| 2038 | |
| 2039 dst = ngx_resolver_alloc(r, size); | |
| 2040 | |
| 2041 if (dst == NULL) { | |
| 2042 return dst; | |
| 2043 } | |
| 2044 | |
| 2045 ngx_memcpy(dst, src, size); | |
| 2046 | |
| 2047 return dst; | |
| 2048 } | |
| 2049 | |
| 2050 | |
| 2051 char * | |
| 2052 ngx_resolver_strerror(ngx_int_t err) | |
| 2053 { | |
| 2054 static char *errors[] = { | |
| 2055 "Format error", /* FORMERR */ | |
| 2056 "Server failure", /* SERVFAIL */ | |
| 2057 "Host not found", /* NXDOMAIN */ | |
| 2058 "Unimplemented", /* NOTIMP */ | |
| 2059 "Operation refused" /* REFUSED */ | |
| 2060 }; | |
| 2061 | |
| 2062 if (err > 0 && err < 6) { | |
| 2063 return errors[err - 1]; | |
| 2064 } | |
| 2065 | |
| 2066 if (err == NGX_RESOLVE_TIMEDOUT) { | |
| 2067 return "Operation timed out"; | |
| 2068 } | |
| 2069 | |
| 2070 return "Unknown error"; | |
| 2071 } | |
| 2072 | |
| 2073 | |
| 2074 ngx_int_t | |
| 2075 ngx_udp_connect(ngx_udp_connection_t *uc) | |
| 2076 { | |
| 2077 int rc; | |
| 2078 ngx_int_t event; | |
| 2079 ngx_event_t *rev, *wev; | |
| 2080 ngx_socket_t s; | |
| 2081 ngx_connection_t *c; | |
| 2082 | |
| 583 | 2083 s = ngx_socket(AF_INET, SOCK_DGRAM, 0); |
| 2084 | |
| 1649 | 2085 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, uc->log, 0, "UDP socket %d", s); |
| 583 | 2086 |
| 2087 if (s == -1) { | |
| 1649 | 2088 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
| 583 | 2089 ngx_socket_n " failed"); |
| 2090 return NGX_ERROR; | |
| 2091 } | |
| 2092 | |
| 1649 | 2093 c = ngx_get_connection(s, uc->log); |
| 583 | 2094 |
| 2095 if (c == NULL) { | |
| 2096 if (ngx_close_socket(s) == -1) { | |
| 1649 | 2097 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
| 583 | 2098 ngx_close_socket_n "failed"); |
| 2099 } | |
| 2100 | |
| 2101 return NGX_ERROR; | |
| 2102 } | |
| 2103 | |
| 1649 | 2104 if (ngx_nonblocking(s) == -1) { |
| 2105 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
| 2106 ngx_nonblocking_n " failed"); | |
| 2107 | |
| 2108 ngx_free_connection(c); | |
| 2109 | |
| 2110 if (ngx_close_socket(s) == -1) { | |
| 2111 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
| 2112 ngx_close_socket_n " failed"); | |
| 2113 } | |
| 2114 | |
| 2115 return NGX_ERROR; | |
| 2116 } | |
| 2117 | |
| 583 | 2118 rev = c->read; |
| 2119 wev = c->write; | |
| 2120 | |
| 1649 | 2121 rev->log = uc->log; |
| 2122 wev->log = uc->log; | |
| 2123 | |
| 2124 uc->connection = c; | |
| 583 | 2125 |
| 2126 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); | |
| 2127 | |
| 2128 #if (NGX_THREADS) | |
| 1649 | 2129 |
| 2130 /* TODO: lock event when call completion handler */ | |
| 2131 | |
| 2132 rev->lock = &c->lock; | |
| 2133 wev->lock = &c->lock; | |
| 583 | 2134 rev->own_lock = &c->lock; |
| 2135 wev->own_lock = &c->lock; | |
| 1649 | 2136 |
| 583 | 2137 #endif |
| 2138 | |
| 1649 | 2139 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, uc->log, 0, |
| 2140 "connect to %V, fd:%d #%d", &uc->server, s, c->number); | |
| 2141 | |
| 2142 rc = connect(s, uc->sockaddr, uc->socklen); | |
| 2143 | |
| 2144 /* TODO: aio, iocp */ | |
| 583 | 2145 |
| 2146 if (rc == -1) { | |
| 1649 | 2147 ngx_log_error(NGX_LOG_CRIT, uc->log, ngx_socket_errno, |
| 2148 "connect() to %V failed", &uc->server); | |
| 583 | 2149 |
| 2150 return NGX_ERROR; | |
| 2151 } | |
| 2152 | |
| 1649 | 2153 /* UDP sockets are always ready to write */ |
| 2154 wev->ready = 1; | |
| 2155 | |
| 2156 if (ngx_add_event) { | |
| 2157 | |
| 2158 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ? | |
| 2159 /* kqueue, epoll */ NGX_CLEAR_EVENT: | |
| 2160 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT; | |
| 2161 /* eventport event type has no meaning: oneshot only */ | |
| 2162 | |
| 2163 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { | |
| 2164 return NGX_ERROR; | |
| 2165 } | |
| 2166 | |
| 2167 } else { | |
| 2168 /* rtsig */ | |
| 2169 | |
| 583 | 2170 if (ngx_add_conn(c) == NGX_ERROR) { |
| 2171 return NGX_ERROR; | |
| 2172 } | |
| 2173 } | |
| 2174 | |
| 2175 return NGX_OK; | |
| 2176 } |