Mercurial > hg > nginx
annotate src/core/ngx_resolver.c @ 3408:71193a456616
add context to a resolver log
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Mon, 11 Jan 2010 11:01:02 +0000 |
| parents | 52e5010cc525 |
| children | ac33852faaac |
| 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); | |
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90 static u_char *ngx_resolver_log_error(ngx_log_t *log, u_char *buf, size_t len); |
| 1649 | 91 |
| 92 | |
| 93 ngx_resolver_t * | |
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94 ngx_resolver_create(ngx_conf_t *cf, ngx_addr_t *addr) |
| 1649 | 95 { |
| 96 ngx_resolver_t *r; | |
| 1906 | 97 ngx_pool_cleanup_t *cln; |
| 1649 | 98 ngx_udp_connection_t *uc; |
| 99 | |
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100 cln = ngx_pool_cleanup_add(cf->pool, 0); |
| 1906 | 101 if (cln == NULL) { |
| 102 return NULL; | |
| 103 } | |
| 104 | |
| 105 cln->handler = ngx_resolver_cleanup; | |
| 106 | |
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107 r = ngx_calloc(sizeof(ngx_resolver_t), cf->log); |
| 1649 | 108 if (r == NULL) { |
| 109 return NULL; | |
| 110 } | |
| 111 | |
| 1906 | 112 cln->data = r; |
| 113 | |
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114 r->event = ngx_calloc(sizeof(ngx_event_t), cf->log); |
| 1649 | 115 if (r->event == NULL) { |
| 116 return NULL; | |
| 117 } | |
| 118 | |
| 1687 | 119 ngx_rbtree_init(&r->name_rbtree, &r->name_sentinel, |
| 120 ngx_resolver_rbtree_insert_value); | |
| 121 | |
| 122 ngx_rbtree_init(&r->addr_rbtree, &r->addr_sentinel, | |
| 123 ngx_rbtree_insert_value); | |
| 1649 | 124 |
| 1685 | 125 ngx_queue_init(&r->name_resend_queue); |
| 126 ngx_queue_init(&r->addr_resend_queue); | |
| 127 | |
| 128 ngx_queue_init(&r->name_expire_queue); | |
| 129 ngx_queue_init(&r->addr_expire_queue); | |
| 1649 | 130 |
| 131 r->event->handler = ngx_resolver_resend_handler; | |
| 132 r->event->data = r; | |
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133 r->event->log = &cf->cycle->new_log; |
| 1649 | 134 r->ident = -1; |
| 135 | |
| 136 r->resend_timeout = 5; | |
| 137 r->expire = 30; | |
| 138 r->valid = 300; | |
| 139 | |
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140 r->log = &cf->cycle->new_log; |
| 1649 | 141 r->log_level = NGX_LOG_ALERT; |
| 142 | |
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143 if (addr) { |
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144 uc = ngx_calloc(sizeof(ngx_udp_connection_t), cf->log); |
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145 if (uc == NULL) { |
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146 return NULL; |
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147 } |
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148 |
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149 r->udp_connection = uc; |
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150 |
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151 uc->sockaddr = addr->sockaddr; |
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152 uc->socklen = addr->socklen; |
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153 uc->server = addr->name; |
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154 |
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155 uc->log = cf->cycle->new_log; |
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156 uc->log.handler = ngx_resolver_log_error; |
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157 uc->log.data = uc; |
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158 uc->log.action = "resolving"; |
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159 } |
| 1649 | 160 |
| 161 return r; | |
| 162 } | |
| 163 | |
| 164 | |
| 1906 | 165 static void |
| 166 ngx_resolver_cleanup(void *data) | |
| 167 { | |
| 168 ngx_resolver_t *r = data; | |
| 169 | |
| 170 if (r) { | |
| 171 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, | |
| 172 "cleanup resolver"); | |
| 173 | |
| 174 ngx_resolver_cleanup_tree(r, &r->name_rbtree); | |
| 175 | |
| 176 ngx_resolver_cleanup_tree(r, &r->addr_rbtree); | |
| 177 | |
| 178 if (r->event) { | |
| 179 ngx_free(r->event); | |
| 180 } | |
| 181 | |
| 182 if (r->udp_connection) { | |
| 183 if (r->udp_connection->connection) { | |
| 184 ngx_close_connection(r->udp_connection->connection); | |
| 185 } | |
| 186 | |
| 187 ngx_free(r->udp_connection); | |
| 188 } | |
| 189 | |
| 190 ngx_free(r); | |
| 191 } | |
| 192 } | |
| 193 | |
| 194 | |
| 195 static void | |
| 196 ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree) | |
| 197 { | |
| 198 ngx_resolver_ctx_t *ctx, *next; | |
| 199 ngx_resolver_node_t *rn; | |
| 200 | |
| 201 while (tree->root != tree->sentinel) { | |
| 202 | |
| 203 rn = (ngx_resolver_node_t *) ngx_rbtree_min(tree->root, tree->sentinel); | |
| 204 | |
| 205 ngx_queue_remove(&rn->queue); | |
| 206 | |
| 207 for (ctx = rn->waiting; ctx; ctx = next) { | |
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208 next = ctx->next; |
| 1906 | 209 |
| 210 if (ctx->event) { | |
| 211 ngx_resolver_free(r, ctx->event); | |
| 212 } | |
| 213 | |
| 214 ngx_resolver_free(r, ctx); | |
| 215 } | |
| 216 | |
| 217 ngx_rbtree_delete(tree, &rn->node); | |
| 218 | |
| 219 ngx_resolver_free_node(r, rn); | |
| 220 } | |
| 221 } | |
| 222 | |
| 223 | |
| 1649 | 224 ngx_resolver_ctx_t * |
| 225 ngx_resolve_start(ngx_resolver_t *r, ngx_resolver_ctx_t *temp) | |
| 226 { | |
| 227 in_addr_t addr; | |
| 228 ngx_resolver_ctx_t *ctx; | |
| 229 | |
| 230 if (temp) { | |
| 231 addr = ngx_inet_addr(temp->name.data, temp->name.len); | |
| 232 | |
| 233 if (addr != INADDR_NONE) { | |
| 234 temp->resolver = r; | |
| 235 temp->state = NGX_OK; | |
| 236 temp->naddrs = 1; | |
| 237 temp->addrs = &temp->addr; | |
| 238 temp->addr = addr; | |
| 239 temp->quick = 1; | |
| 240 | |
| 241 return temp; | |
| 242 } | |
| 243 } | |
| 244 | |
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245 if (r->udp_connection == NULL) { |
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246 return NGX_NO_RESOLVER; |
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247 } |
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248 |
| 1649 | 249 ctx = ngx_resolver_calloc(r, sizeof(ngx_resolver_ctx_t)); |
| 250 | |
| 251 if (ctx) { | |
| 252 ctx->resolver = r; | |
| 253 } | |
| 254 | |
| 255 return ctx; | |
| 256 } | |
| 257 | |
| 258 | |
| 259 ngx_int_t | |
| 260 ngx_resolve_name(ngx_resolver_ctx_t *ctx) | |
| 261 { | |
| 262 ngx_int_t rc; | |
| 263 ngx_resolver_t *r; | |
| 264 | |
| 265 r = ctx->resolver; | |
| 266 | |
| 267 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 268 "resolve: \"%V\"", &ctx->name); | |
| 269 | |
| 270 if (ctx->quick) { | |
| 271 ctx->handler(ctx); | |
| 272 return NGX_OK; | |
| 273 } | |
| 274 | |
| 275 /* lock name mutex */ | |
| 276 | |
| 277 rc = ngx_resolve_name_locked(r, ctx); | |
| 278 | |
| 279 if (rc == NGX_OK) { | |
| 280 return NGX_OK; | |
| 281 } | |
| 282 | |
| 283 /* unlock name mutex */ | |
| 284 | |
| 285 if (rc == NGX_AGAIN) { | |
| 286 return NGX_OK; | |
| 287 } | |
| 288 | |
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289 /* NGX_ERROR */ |
| 1649 | 290 |
| 291 if (ctx->event) { | |
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292 ngx_resolver_free(r, ctx->event); |
| 1649 | 293 } |
| 294 | |
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295 ngx_resolver_free(r, ctx); |
| 1649 | 296 |
| 297 return NGX_ERROR; | |
| 298 } | |
| 299 | |
| 300 | |
| 301 void | |
| 302 ngx_resolve_name_done(ngx_resolver_ctx_t *ctx) | |
| 303 { | |
| 304 uint32_t hash; | |
| 305 ngx_resolver_t *r; | |
| 306 ngx_resolver_ctx_t *w, **p; | |
| 307 ngx_resolver_node_t *rn; | |
| 308 | |
| 309 r = ctx->resolver; | |
| 310 | |
| 311 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 312 "resolve name done: %i", ctx->state); | |
| 313 | |
| 314 if (ctx->quick) { | |
| 315 return; | |
| 316 } | |
| 317 | |
| 318 if (ctx->event && ctx->event->timer_set) { | |
| 319 ngx_del_timer(ctx->event); | |
| 320 } | |
| 321 | |
| 322 /* lock name mutex */ | |
| 323 | |
| 324 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
| 325 | |
| 326 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
| 327 | |
| 328 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
| 329 | |
| 330 if (rn) { | |
| 331 p = &rn->waiting; | |
| 332 w = rn->waiting; | |
| 333 | |
| 334 while (w) { | |
| 335 if (w == ctx) { | |
| 336 *p = w->next; | |
| 337 | |
| 338 goto done; | |
| 339 } | |
| 340 | |
| 341 p = &w->next; | |
| 342 w = w->next; | |
| 343 } | |
| 344 } | |
| 345 | |
| 346 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
| 347 "could not cancel %V resolving", &ctx->name); | |
| 348 } | |
| 349 | |
| 350 done: | |
| 351 | |
| 352 ngx_resolver_expire(r, &r->name_rbtree, &r->name_expire_queue); | |
| 353 | |
| 354 /* unlock name mutex */ | |
| 355 | |
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356 /* lock alloc mutex */ |
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357 |
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358 if (ctx->event) { |
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359 ngx_resolver_free_locked(r, ctx->event); |
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360 } |
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361 |
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362 ngx_resolver_free_locked(r, ctx); |
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363 |
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364 /* unlock alloc mutex */ |
| 1649 | 365 } |
| 366 | |
| 367 | |
| 368 /* NGX_RESOLVE_A only */ | |
| 369 | |
| 370 static ngx_int_t | |
| 371 ngx_resolve_name_locked(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx) | |
| 372 { | |
| 373 uint32_t hash; | |
| 374 in_addr_t addr, *addrs; | |
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375 ngx_int_t rc; |
| 1649 | 376 ngx_uint_t naddrs; |
| 377 ngx_resolver_ctx_t *next; | |
| 378 ngx_resolver_node_t *rn; | |
| 379 | |
| 380 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
| 381 | |
| 382 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
| 383 | |
| 384 if (rn) { | |
| 385 | |
| 386 if (rn->valid >= ngx_time()) { | |
| 387 | |
| 388 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
| 389 | |
| 390 ngx_queue_remove(&rn->queue); | |
| 391 | |
| 392 rn->expire = ngx_time() + r->expire; | |
| 393 | |
| 394 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 395 | |
| 396 naddrs = rn->naddrs; | |
| 397 | |
| 398 if (naddrs) { | |
| 399 | |
| 400 /* NGX_RESOLVE_A answer */ | |
| 401 | |
| 402 if (naddrs != 1) { | |
| 403 addr = 0; | |
| 404 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
| 405 naddrs * sizeof(in_addr_t)); | |
| 406 if (addrs == NULL) { | |
| 407 return NGX_ERROR; | |
| 408 } | |
| 409 | |
| 410 } else { | |
| 411 addr = rn->u.addr; | |
| 412 addrs = NULL; | |
| 413 } | |
| 414 | |
| 415 ctx->next = rn->waiting; | |
| 416 rn->waiting = NULL; | |
| 417 | |
| 418 /* unlock name mutex */ | |
| 419 | |
| 420 do { | |
| 421 ctx->state = NGX_OK; | |
| 422 ctx->naddrs = naddrs; | |
| 423 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 424 ctx->addr = addr; | |
| 425 next = ctx->next; | |
| 426 | |
| 427 ctx->handler(ctx); | |
| 428 | |
| 429 ctx = next; | |
| 430 } while (ctx); | |
| 431 | |
| 432 if (addrs) { | |
| 433 ngx_resolver_free(r, addrs); | |
| 434 } | |
| 435 | |
| 436 return NGX_OK; | |
| 437 } | |
| 438 | |
| 439 /* NGX_RESOLVE_CNAME */ | |
| 440 | |
| 1969 | 441 if (ctx->recursion++ < NGX_RESOLVER_MAX_RECURSION) { |
| 442 | |
| 443 ctx->name.len = rn->cnlen; | |
| 444 ctx->name.data = rn->u.cname; | |
| 445 | |
| 446 return ngx_resolve_name_locked(r, ctx); | |
| 447 } | |
| 448 | |
| 449 ctx->next = rn->waiting; | |
| 450 rn->waiting = NULL; | |
| 451 | |
| 452 /* unlock name mutex */ | |
| 453 | |
| 454 do { | |
| 455 ctx->state = NGX_RESOLVE_NXDOMAIN; | |
| 456 next = ctx->next; | |
| 457 | |
| 458 ctx->handler(ctx); | |
| 459 | |
| 460 ctx = next; | |
| 461 } while (ctx); | |
| 462 | |
| 463 return NGX_OK; | |
| 1649 | 464 } |
| 465 | |
| 466 if (rn->waiting) { | |
| 467 | |
| 468 ctx->next = rn->waiting; | |
| 469 rn->waiting = ctx; | |
| 3297 | 470 ctx->state = NGX_AGAIN; |
| 1649 | 471 |
| 472 return NGX_AGAIN; | |
| 473 } | |
| 474 | |
| 475 ngx_queue_remove(&rn->queue); | |
| 476 | |
| 477 /* lock alloc mutex */ | |
| 478 | |
| 479 ngx_resolver_free_locked(r, rn->query); | |
|
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fix memory leak on resolver query send failure
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parents:
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diff
changeset
|
480 rn->query = NULL; |
| 1649 | 481 |
| 482 if (rn->cnlen) { | |
| 483 ngx_resolver_free_locked(r, rn->u.cname); | |
| 484 } | |
| 485 | |
| 486 if (rn->naddrs > 1) { | |
| 487 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 488 } | |
| 489 | |
| 490 /* unlock alloc mutex */ | |
| 491 | |
| 492 } else { | |
| 493 | |
| 494 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
| 495 if (rn == NULL) { | |
| 496 return NGX_ERROR; | |
| 497 } | |
| 498 | |
| 499 rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len); | |
| 500 if (rn->name == NULL) { | |
| 501 ngx_resolver_free(r, rn); | |
| 502 return NGX_ERROR; | |
| 503 } | |
| 504 | |
| 505 rn->node.key = hash; | |
| 506 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:
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diff
changeset
|
507 rn->query = NULL; |
| 1649 | 508 |
| 509 ngx_rbtree_insert(&r->name_rbtree, &rn->node); | |
| 510 } | |
| 511 | |
|
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
512 rc = ngx_resolver_create_name_query(rn, ctx); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
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parents:
1960
diff
changeset
|
513 |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
514 if (rc == NGX_ERROR) { |
| 1649 | 515 goto failed; |
| 516 } | |
| 517 | |
|
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
518 if (rc == NGX_DECLINED) { |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
519 ngx_rbtree_delete(&r->name_rbtree, &rn->node); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
520 |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
521 ngx_resolver_free(r, rn->query); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
522 ngx_resolver_free(r, rn->name); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
523 ngx_resolver_free(r, rn); |
|
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 ctx->state = NGX_RESOLVE_NXDOMAIN; |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
526 ctx->handler(ctx); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
527 |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
528 return NGX_OK; |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
529 } |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
530 |
| 1649 | 531 if (ngx_resolver_send_query(r, rn) != NGX_OK) { |
| 532 goto failed; | |
| 533 } | |
| 534 | |
| 535 if (ctx->event == NULL) { | |
| 536 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
| 537 if (ctx->event == NULL) { | |
| 538 goto failed; | |
| 539 } | |
| 540 | |
| 541 ctx->event->handler = ngx_resolver_timeout_handler; | |
| 542 ctx->event->data = ctx; | |
| 543 ctx->event->log = r->log; | |
| 544 ctx->ident = -1; | |
| 545 | |
| 546 ngx_add_timer(ctx->event, ctx->timeout); | |
| 547 } | |
| 548 | |
| 549 if (ngx_queue_empty(&r->name_resend_queue)) { | |
| 550 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
| 551 } | |
| 552 | |
| 553 rn->expire = ngx_time() + r->resend_timeout; | |
| 554 | |
| 555 ngx_queue_insert_head(&r->name_resend_queue, &rn->queue); | |
| 556 | |
| 557 rn->cnlen = 0; | |
| 558 rn->naddrs = 0; | |
| 559 rn->valid = 0; | |
| 560 rn->waiting = ctx; | |
| 561 | |
| 562 ctx->state = NGX_AGAIN; | |
| 563 | |
| 564 return NGX_AGAIN; | |
| 565 | |
| 566 failed: | |
| 567 | |
| 568 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 569 | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
570 if (rn->query) { |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
571 ngx_resolver_free(r, rn->query); |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
572 } |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
573 |
| 1649 | 574 ngx_resolver_free(r, rn->name); |
| 575 | |
| 576 ngx_resolver_free(r, rn); | |
| 577 | |
| 578 return NGX_ERROR; | |
| 579 } | |
| 583 | 580 |
| 581 | |
| 582 ngx_int_t | |
| 1649 | 583 ngx_resolve_addr(ngx_resolver_ctx_t *ctx) |
| 584 { | |
|
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
585 u_char *name; |
| 1649 | 586 ngx_resolver_t *r; |
| 587 ngx_resolver_node_t *rn; | |
| 588 | |
| 589 r = ctx->resolver; | |
| 590 | |
| 591 ctx->addr = ntohl(ctx->addr); | |
| 592 | |
| 593 /* lock addr mutex */ | |
| 594 | |
| 595 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
| 596 | |
| 597 if (rn) { | |
| 598 | |
| 599 if (rn->valid >= ngx_time()) { | |
| 600 | |
| 601 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
| 602 | |
| 603 ngx_queue_remove(&rn->queue); | |
| 604 | |
| 605 rn->expire = ngx_time() + r->expire; | |
| 606 | |
| 607 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
| 608 | |
|
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
609 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
|
610 if (name == NULL) { |
| 1649 | 611 goto failed; |
| 612 } | |
| 613 | |
|
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
614 ctx->name.len = rn->nlen; |
|
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
615 ctx->name.data = name; |
|
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
616 |
| 1649 | 617 /* unlock addr mutex */ |
| 618 | |
| 619 ctx->state = NGX_OK; | |
| 620 | |
| 621 ctx->handler(ctx); | |
| 622 | |
|
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
623 ngx_resolver_free(r, name); |
| 1649 | 624 |
| 625 return NGX_OK; | |
| 626 } | |
| 627 | |
| 628 if (rn->waiting) { | |
| 629 | |
| 630 ctx->next = rn->waiting; | |
| 631 rn->waiting = ctx; | |
| 3297 | 632 ctx->state = NGX_AGAIN; |
| 1649 | 633 |
|
2487
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
634 /* unlock addr mutex */ |
|
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
635 |
|
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
636 return NGX_OK; |
| 1649 | 637 } |
| 638 | |
| 639 ngx_queue_remove(&rn->queue); | |
| 640 | |
| 641 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
|
642 rn->query = NULL; |
| 1649 | 643 |
| 644 } else { | |
| 645 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
| 646 if (rn == NULL) { | |
| 647 goto failed; | |
| 648 } | |
| 649 | |
| 650 rn->node.key = ctx->addr; | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
651 rn->query = NULL; |
| 1649 | 652 |
| 653 ngx_rbtree_insert(&r->addr_rbtree, &rn->node); | |
| 654 } | |
| 655 | |
| 656 if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) { | |
| 657 goto failed; | |
| 658 } | |
| 659 | |
| 660 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
| 661 goto failed; | |
| 662 } | |
| 663 | |
| 664 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
| 665 if (ctx->event == NULL) { | |
| 666 goto failed; | |
| 667 } | |
| 668 | |
| 669 ctx->event->handler = ngx_resolver_timeout_handler; | |
| 670 ctx->event->data = ctx; | |
| 671 ctx->event->log = r->log; | |
| 672 ctx->ident = -1; | |
| 673 | |
| 674 ngx_add_timer(ctx->event, ctx->timeout); | |
| 675 | |
| 676 if (ngx_queue_empty(&r->addr_resend_queue)) { | |
| 677 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
| 678 } | |
| 679 | |
| 680 rn->expire = ngx_time() + r->resend_timeout; | |
| 681 | |
| 682 ngx_queue_insert_head(&r->addr_resend_queue, &rn->queue); | |
| 683 | |
| 684 rn->cnlen = 0; | |
| 685 rn->naddrs = 0; | |
| 686 rn->name = NULL; | |
| 687 rn->nlen = 0; | |
| 688 rn->valid = 0; | |
| 689 rn->waiting = ctx; | |
| 690 | |
| 691 /* unlock addr mutex */ | |
| 692 | |
| 693 ctx->state = NGX_AGAIN; | |
| 694 | |
| 695 return NGX_OK; | |
| 696 | |
| 697 failed: | |
| 698 | |
| 699 if (rn) { | |
| 700 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 701 | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
702 if (rn->query) { |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
703 ngx_resolver_free(r, rn->query); |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
704 } |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
705 |
| 1649 | 706 ngx_resolver_free(r, rn); |
| 707 } | |
| 708 | |
| 709 /* unlock addr mutex */ | |
| 710 | |
| 711 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
|
712 ngx_resolver_free(r, ctx->event); |
| 1649 | 713 } |
| 714 | |
|
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
715 ngx_resolver_free(r, ctx); |
| 1649 | 716 |
| 717 return NGX_ERROR; | |
| 718 } | |
| 719 | |
| 720 | |
| 721 void | |
| 722 ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx) | |
| 723 { | |
| 724 in_addr_t addr; | |
| 725 ngx_resolver_t *r; | |
| 726 ngx_resolver_ctx_t *w, **p; | |
| 727 ngx_resolver_node_t *rn; | |
| 728 | |
| 729 r = ctx->resolver; | |
| 730 | |
| 731 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 732 "resolve addr done: %i", ctx->state); | |
| 733 | |
| 734 if (ctx->event && ctx->event->timer_set) { | |
| 735 ngx_del_timer(ctx->event); | |
| 736 } | |
| 737 | |
| 738 /* lock addr mutex */ | |
| 739 | |
| 740 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
| 741 | |
| 742 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
| 743 | |
| 744 if (rn) { | |
| 745 p = &rn->waiting; | |
| 746 w = rn->waiting; | |
| 747 | |
| 748 while (w) { | |
| 749 if (w == ctx) { | |
| 750 *p = w->next; | |
| 751 | |
| 752 goto done; | |
| 753 } | |
| 754 | |
| 755 p = &w->next; | |
| 756 w = w->next; | |
| 757 } | |
| 758 } | |
| 759 | |
| 760 addr = ntohl(ctx->addr); | |
| 761 | |
| 762 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
| 763 "could not cancel %ud.%ud.%ud.%ud resolving", | |
| 764 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 765 (addr >> 8) & 0xff, addr & 0xff); | |
| 766 } | |
| 767 | |
| 768 done: | |
| 769 | |
| 770 ngx_resolver_expire(r, &r->addr_rbtree, &r->addr_expire_queue); | |
| 771 | |
| 772 /* unlock addr mutex */ | |
| 773 | |
|
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
774 /* 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
|
775 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
776 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
|
777 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
|
778 } |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
779 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
780 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
|
781 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
782 /* unlock alloc mutex */ |
| 1649 | 783 } |
| 784 | |
| 785 | |
| 786 static void | |
| 787 ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 788 { | |
| 789 time_t now; | |
| 790 ngx_uint_t i; | |
| 791 ngx_queue_t *q; | |
| 792 ngx_resolver_node_t *rn; | |
| 793 | |
| 794 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire"); | |
| 795 | |
| 796 now = ngx_time(); | |
| 797 | |
| 798 for (i = 0; i < 2; i++) { | |
| 799 if (ngx_queue_empty(queue)) { | |
| 800 return; | |
| 801 } | |
| 802 | |
| 803 q = ngx_queue_last(queue); | |
| 804 | |
| 805 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 806 | |
| 807 if (now <= rn->expire) { | |
| 808 return; | |
| 809 } | |
| 810 | |
| 1774 | 811 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, |
| 812 "resolver expire \"%*s\"", (size_t) rn->nlen, rn->name); | |
| 1649 | 813 |
| 814 ngx_queue_remove(q); | |
| 815 | |
| 816 ngx_rbtree_delete(tree, &rn->node); | |
| 817 | |
| 818 ngx_resolver_free_node(r, rn); | |
| 819 } | |
| 820 } | |
| 821 | |
| 822 | |
| 823 static ngx_int_t | |
| 824 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 825 { | |
| 826 ssize_t n; | |
| 827 ngx_udp_connection_t *uc; | |
| 828 | |
| 829 uc = r->udp_connection; | |
| 830 | |
| 831 if (uc->connection == NULL) { | |
| 832 if (ngx_udp_connect(uc) != NGX_OK) { | |
| 833 return NGX_ERROR; | |
| 834 } | |
| 835 | |
| 836 uc->connection->data = r; | |
| 837 uc->connection->read->handler = ngx_resolver_read_response; | |
| 1906 | 838 uc->connection->read->resolver = 1; |
| 1649 | 839 } |
| 840 | |
| 841 n = ngx_send(uc->connection, rn->query, rn->qlen); | |
| 842 | |
| 843 if (n == -1) { | |
| 844 return NGX_ERROR; | |
| 845 } | |
| 846 | |
| 847 if ((size_t) n != (size_t) rn->qlen) { | |
|
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|
848 ngx_log_error(NGX_LOG_CRIT, &uc->log, 0, "send() incomplete"); |
| 1649 | 849 return NGX_ERROR; |
| 850 } | |
| 851 | |
| 852 return NGX_OK; | |
| 853 } | |
| 854 | |
| 855 | |
| 856 static void | |
| 857 ngx_resolver_resend_handler(ngx_event_t *ev) | |
| 858 { | |
| 859 time_t timer, atimer, ntimer; | |
| 860 ngx_resolver_t *r; | |
| 861 | |
| 862 r = ev->data; | |
| 863 | |
| 864 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 865 "resolver resend handler"); | |
| 866 | |
| 867 /* lock name mutex */ | |
| 868 | |
| 869 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue); | |
| 870 | |
| 871 /* unlock name mutex */ | |
| 872 | |
| 873 /* lock addr mutex */ | |
| 874 | |
| 875 atimer = ngx_resolver_resend(r, &r->addr_rbtree, &r->addr_resend_queue); | |
|
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diff
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|
876 |
| 1649 | 877 /* unlock addr mutex */ |
| 878 | |
| 879 if (ntimer == 0) { | |
| 880 timer = atimer; | |
| 881 | |
| 882 } else if (atimer == 0) { | |
| 883 timer = ntimer; | |
| 884 | |
| 885 } else { | |
| 886 timer = (atimer < ntimer) ? atimer : ntimer; | |
| 887 } | |
| 888 | |
| 889 if (timer) { | |
| 890 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000)); | |
| 891 } | |
| 892 } | |
| 893 | |
| 894 | |
| 895 static time_t | |
| 896 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 897 { | |
| 898 time_t now; | |
| 899 ngx_queue_t *q; | |
| 900 ngx_resolver_node_t *rn; | |
| 901 | |
| 902 now = ngx_time(); | |
| 903 | |
| 904 for ( ;; ) { | |
| 905 if (ngx_queue_empty(queue)) { | |
| 906 return 0; | |
| 907 } | |
| 908 | |
| 909 q = ngx_queue_last(queue); | |
| 910 | |
| 911 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 912 | |
| 913 if (now < rn->expire) { | |
| 914 return rn->expire - now; | |
| 915 } | |
| 916 | |
| 1774 | 917 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, |
| 918 "resolver resend \"%*s\" %p", | |
| 919 (size_t) rn->nlen, rn->name, rn->waiting); | |
| 1649 | 920 |
| 921 ngx_queue_remove(q); | |
| 922 | |
| 923 if (rn->waiting) { | |
| 924 | |
| 925 if (ngx_resolver_send_query(r, rn) == NGX_OK) { | |
| 926 | |
| 927 rn->expire = now + r->resend_timeout; | |
| 928 | |
| 929 ngx_queue_insert_head(queue, &rn->queue); | |
| 930 } | |
|
1879
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|
931 |
|
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|
932 continue; |
| 1649 | 933 } |
| 934 | |
| 935 ngx_rbtree_delete(tree, &rn->node); | |
| 936 | |
| 937 ngx_resolver_free_node(r, rn); | |
| 938 } | |
| 939 } | |
| 940 | |
| 941 | |
| 942 static void | |
| 943 ngx_resolver_read_response(ngx_event_t *rev) | |
| 944 { | |
| 945 ssize_t n; | |
| 946 ngx_connection_t *c; | |
| 947 u_char buf[NGX_RESOLVER_UDP_SIZE]; | |
| 948 | |
| 949 c = rev->data; | |
| 950 | |
| 951 do { | |
| 1689 | 952 n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE); |
| 953 | |
| 954 if (n < 0) { | |
| 1649 | 955 return; |
| 956 } | |
| 957 | |
| 958 ngx_resolver_process_response(c->data, buf, n); | |
| 959 | |
| 960 } while (rev->ready); | |
| 961 } | |
| 962 | |
| 963 | |
| 964 static void | |
| 965 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n) | |
| 966 { | |
| 967 char *err; | |
| 968 size_t len; | |
|
2282
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diff
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|
969 ngx_uint_t i, times, ident, qident, flags, code, nqs, nan, |
|
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|
970 qtype, qclass; |
|
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|
971 ngx_queue_t *q; |
| 1649 | 972 ngx_resolver_qs_t *qs; |
|
2282
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diff
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|
973 ngx_resolver_node_t *rn; |
| 1649 | 974 ngx_resolver_query_t *query; |
| 975 | |
|
2281
5004229420a6
FORMERR DNS response may be equal to mininal query size
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
976 if ((size_t) n < sizeof(ngx_resolver_query_t)) { |
| 1649 | 977 goto short_response; |
| 978 } | |
| 979 | |
| 980 query = (ngx_resolver_query_t *) buf; | |
| 981 | |
| 982 ident = (query->ident_hi << 8) + query->ident_lo; | |
| 983 flags = (query->flags_hi << 8) + query->flags_lo; | |
| 984 nqs = (query->nqs_hi << 8) + query->nqs_lo; | |
| 985 nan = (query->nan_hi << 8) + query->nan_lo; | |
| 986 | |
| 987 ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0, | |
|
1967
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diff
changeset
|
988 "resolver DNS response %ui fl:%04Xui %ui/%ui/%ui/%ui", |
| 1649 | 989 ident, flags, nqs, nan, |
| 990 (query->nns_hi << 8) + query->nns_lo, | |
| 991 (query->nar_hi << 8) + query->nar_lo); | |
| 992 | |
| 993 if (!(flags & 0x8000)) { | |
| 994 ngx_log_error(r->log_level, r->log, 0, | |
|
1967
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diff
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|
995 "invalid DNS response %ui fl:%04Xui", ident, flags); |
| 1649 | 996 return; |
| 997 } | |
| 998 | |
| 999 code = flags & 0x7f; | |
| 1000 | |
|
2282
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2281
diff
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|
1001 if (code == NGX_RESOLVE_FORMERR) { |
|
ec97eb9a8038
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parents:
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diff
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|
1002 |
|
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|
1003 times = 0; |
|
ec97eb9a8038
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diff
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|
1004 |
|
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|
1005 for (q = ngx_queue_head(&r->name_resend_queue); |
|
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|
1006 q != ngx_queue_sentinel(&r->name_resend_queue) || times++ < 100; |
|
ec97eb9a8038
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diff
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|
1007 q = ngx_queue_next(q)) |
|
ec97eb9a8038
show name for a FORMERR DNS response
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diff
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|
1008 { |
|
ec97eb9a8038
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2281
diff
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|
1009 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); |
|
ec97eb9a8038
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diff
changeset
|
1010 qident = (rn->query[0] << 8) + rn->query[1]; |
|
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parents:
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diff
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|
1011 |
|
ec97eb9a8038
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2281
diff
changeset
|
1012 if (qident == ident) { |
|
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diff
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|
1013 ngx_log_error(r->log_level, r->log, 0, |
|
ec97eb9a8038
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diff
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|
1014 "DNS error (%ui: %s), query id:%ui, name:\"%*s\"", |
|
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2281
diff
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|
1015 code, ngx_resolver_strerror(code), ident, |
|
ec97eb9a8038
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Igor Sysoev <igor@sysoev.ru>
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diff
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|
1016 rn->nlen, rn->name); |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
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|
1017 return; |
|
ec97eb9a8038
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parents:
2281
diff
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|
1018 } |
|
ec97eb9a8038
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parents:
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diff
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|
1019 } |
|
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diff
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|
1020 |
|
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Igor Sysoev <igor@sysoev.ru>
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|
1021 goto dns_error; |
|
ec97eb9a8038
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Igor Sysoev <igor@sysoev.ru>
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2281
diff
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|
1022 } |
|
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diff
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|
1023 |
|
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2281
diff
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|
1024 if (code > NGX_RESOLVE_REFUSED) { |
|
ec97eb9a8038
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2281
diff
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|
1025 goto dns_error; |
| 1649 | 1026 } |
| 1027 | |
| 1028 if (nqs != 1) { | |
| 1029 err = "invalid number of questions in DNS response"; | |
| 1030 goto done; | |
| 1031 } | |
| 1032 | |
| 1033 i = sizeof(ngx_resolver_query_t); | |
| 1034 | |
| 1035 while (i < (ngx_uint_t) n) { | |
| 1036 if (buf[i] == '\0') { | |
| 1037 goto found; | |
| 1038 } | |
| 1039 | |
| 1040 len = buf[i]; | |
| 1041 i += 1 + len; | |
| 1042 } | |
| 1043 | |
| 1044 goto short_response; | |
| 1045 | |
| 1046 found: | |
| 1047 | |
| 1048 if (i++ == 0) { | |
| 1049 err = "zero-length domain name in DNS response"; | |
| 1050 goto done; | |
| 1051 } | |
| 1052 | |
| 1053 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t)) | |
| 1054 > (ngx_uint_t) n) | |
| 1055 { | |
| 1056 goto short_response; | |
| 1057 } | |
| 1058 | |
| 1059 qs = (ngx_resolver_qs_t *) &buf[i]; | |
| 1060 | |
| 1061 qtype = (qs->type_hi << 8) + qs->type_lo; | |
| 1062 qclass = (qs->class_hi << 8) + qs->class_lo; | |
| 1063 | |
| 1064 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
|
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1065 "resolver DNS response qt:%ui cl:%ui", qtype, qclass); |
| 1649 | 1066 |
| 1067 if (qclass != 1) { | |
| 1068 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
|
1069 "unknown query class %ui in DNS response", qclass); |
| 1649 | 1070 return; |
| 1071 } | |
| 1072 | |
| 1073 switch (qtype) { | |
| 1074 | |
| 1075 case NGX_RESOLVE_A: | |
| 1076 | |
| 1077 ngx_resolver_process_a(r, buf, n, ident, code, nan, | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1078 i + sizeof(ngx_resolver_qs_t)); |
| 1649 | 1079 |
| 1080 break; | |
| 1081 | |
| 1082 case NGX_RESOLVE_PTR: | |
| 1083 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1084 ngx_resolver_process_ptr(r, buf, n, ident, code, nan); |
| 1649 | 1085 |
| 1086 break; | |
| 1087 | |
| 1088 default: | |
| 1089 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
|
1090 "unknown query type %ui in DNS response", qtype); |
| 1649 | 1091 return; |
| 1092 } | |
| 1093 | |
| 1094 return; | |
| 1095 | |
| 1096 short_response: | |
| 1097 | |
| 1098 err = "short dns response"; | |
| 1099 | |
| 1100 done: | |
| 1101 | |
| 1102 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1103 | |
| 1104 return; | |
|
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parents:
2281
diff
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|
1105 |
|
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2281
diff
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|
1106 dns_error: |
|
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diff
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|
1107 |
|
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|
1108 ngx_log_error(r->log_level, r->log, 0, |
|
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2281
diff
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|
1109 "DNS error (%ui: %s), query id:%ui", |
|
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2281
diff
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|
1110 code, ngx_resolver_strerror(code), ident); |
|
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diff
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|
1111 return; |
| 1649 | 1112 } |
| 1113 | |
| 1114 | |
| 1115 static void | |
| 1116 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last, | |
| 1117 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans) | |
| 583 | 1118 { |
| 1649 | 1119 char *err; |
| 1120 u_char *cname; | |
| 1121 size_t len; | |
| 1122 uint32_t hash; | |
| 1123 in_addr_t addr, *addrs; | |
| 1124 ngx_str_t name; | |
| 1125 ngx_uint_t qtype, qident, naddrs, a, i, n, start; | |
| 1126 ngx_resolver_an_t *an; | |
| 1127 ngx_resolver_ctx_t *ctx, *next; | |
| 1128 ngx_resolver_node_t *rn; | |
| 1129 | |
| 1130 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) { | |
| 1131 return; | |
| 1132 } | |
| 1133 | |
| 1134 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); | |
| 1135 | |
| 1136 hash = ngx_crc32_short(name.data, name.len); | |
| 1137 | |
| 1138 /* lock name mutex */ | |
| 1139 | |
| 1140 rn = ngx_resolver_lookup_name(r, &name, hash); | |
| 1141 | |
| 1142 if (rn == NULL || rn->query == NULL) { | |
| 1143 ngx_log_error(r->log_level, r->log, 0, | |
| 1144 "unexpected response for %V", &name); | |
| 1145 goto failed; | |
| 1146 } | |
| 1147 | |
| 1148 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 1149 | |
| 1150 if (ident != qident) { | |
| 1151 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
|
1152 "wrong ident %ui response for %V, expect %ui", |
| 1649 | 1153 ident, &name, qident); |
| 1154 goto failed; | |
| 1155 } | |
| 1156 | |
| 3139 | 1157 ngx_resolver_free(r, name.data); |
| 1158 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1159 if (code == 0 && nan == 0) { |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1160 code = 3; /* NXDOMAIN */ |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1161 } |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1162 |
| 1649 | 1163 if (code) { |
| 1164 next = rn->waiting; | |
| 1165 rn->waiting = NULL; | |
| 1166 | |
| 1167 ngx_queue_remove(&rn->queue); | |
| 1168 | |
| 1169 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 1170 | |
| 1171 ngx_resolver_free_node(r, rn); | |
| 1172 | |
| 1173 /* unlock name mutex */ | |
| 1174 | |
| 1175 while (next) { | |
| 1176 ctx = next; | |
| 1177 ctx->state = code; | |
| 1178 next = ctx->next; | |
| 1179 | |
| 1180 ctx->handler(ctx); | |
| 1181 } | |
| 1182 | |
| 1183 return; | |
| 1184 } | |
| 1185 | |
| 1186 i = ans; | |
| 1187 naddrs = 0; | |
| 1188 addr = 0; | |
| 1189 addrs = NULL; | |
| 1190 cname = NULL; | |
| 1191 qtype = 0; | |
| 1192 | |
| 1193 for (a = 0; a < nan; a++) { | |
| 1194 | |
| 1195 start = i; | |
| 1196 | |
| 1197 while (i < last) { | |
| 1198 | |
| 1199 if (buf[i] & 0xc0) { | |
| 1200 i += 2; | |
| 1201 goto found; | |
| 1202 } | |
| 1203 | |
| 1204 if (buf[i] == 0) { | |
| 1205 i++; | |
| 1206 goto test_length; | |
| 1207 } | |
| 1208 | |
| 1209 i += 1 + buf[i]; | |
| 1210 } | |
| 1211 | |
| 1212 goto short_response; | |
| 1213 | |
| 1214 test_length: | |
| 1215 | |
| 1216 if (i - start < 2) { | |
| 1217 err = "invalid name in dns response"; | |
| 1218 goto invalid; | |
| 1219 } | |
| 1220 | |
| 1221 found: | |
| 1222 | |
| 1223 if (i + sizeof(ngx_resolver_an_t) >= last) { | |
| 1224 goto short_response; | |
| 1225 } | |
| 1226 | |
| 1227 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1228 | |
| 1229 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1230 len = (an->len_hi << 8) + an->len_lo; | |
| 1231 | |
| 1232 if (qtype == NGX_RESOLVE_A) { | |
| 1233 | |
| 1234 i += sizeof(ngx_resolver_an_t); | |
| 1235 | |
| 1236 if (i + len > last) { | |
| 1237 goto short_response; | |
| 1238 } | |
| 1239 | |
| 1240 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1241 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1242 | |
| 1243 naddrs++; | |
| 1244 | |
| 1245 i += len; | |
| 1246 | |
| 1247 } else if (qtype == NGX_RESOLVE_CNAME) { | |
| 1248 cname = &buf[i] + sizeof(ngx_resolver_an_t); | |
| 1249 i += sizeof(ngx_resolver_an_t) + len; | |
| 1965 | 1250 |
| 1251 } else if (qtype == NGX_RESOLVE_DNAME) { | |
| 1252 i += sizeof(ngx_resolver_an_t) + len; | |
| 1966 | 1253 |
| 1254 } else { | |
| 1255 ngx_log_error(r->log_level, r->log, 0, | |
| 1256 "unexpected qtype %ui", qtype); | |
| 1649 | 1257 } |
| 1258 } | |
| 1259 | |
| 1260 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1261 "resolver naddrs:%ui cname:%p", naddrs, cname); | |
| 1262 | |
| 1263 if (naddrs) { | |
| 1264 | |
| 1265 if (naddrs == 1) { | |
| 1266 rn->u.addr = addr; | |
| 1267 | |
| 1268 } else { | |
| 1269 | |
| 1270 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t)); | |
| 1271 if (addrs == NULL) { | |
| 1272 return; | |
| 1273 } | |
| 1274 | |
| 1275 n = 0; | |
| 1276 i = ans; | |
| 1277 | |
| 1278 for (a = 0; a < nan; a++) { | |
| 1279 | |
| 1280 for ( ;; ) { | |
| 1281 | |
| 1282 if (buf[i] & 0xc0) { | |
| 1283 i += 2; | |
| 1284 goto ok; | |
| 1285 } | |
| 1286 | |
| 1287 if (buf[i] == 0) { | |
| 1288 i++; | |
| 1289 goto ok; | |
| 1290 } | |
| 1291 | |
| 1292 i += 1 + buf[i]; | |
| 1293 } | |
| 1294 | |
| 1295 ok: | |
| 1296 | |
| 1297 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1298 | |
| 1299 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1300 len = (an->len_hi << 8) + an->len_lo; | |
| 1301 | |
| 1302 i += sizeof(ngx_resolver_an_t); | |
| 1303 | |
| 1304 if (qtype == NGX_RESOLVE_A) { | |
| 1305 | |
| 1306 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1307 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1308 | |
| 1309 if (n == naddrs) { | |
| 1310 break; | |
| 1311 } | |
| 1312 } | |
| 1313 | |
| 1314 i += len; | |
| 1315 } | |
| 1316 | |
| 1317 rn->u.addrs = addrs; | |
| 1318 | |
| 1319 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
| 1320 naddrs * sizeof(in_addr_t)); | |
| 1321 if (addrs == NULL) { | |
| 1322 return; | |
| 1323 } | |
| 1324 } | |
| 1325 | |
| 1326 rn->naddrs = (u_short) naddrs; | |
| 1327 | |
| 1328 ngx_queue_remove(&rn->queue); | |
| 1329 | |
| 1330 rn->valid = ngx_time() + r->valid; | |
| 1331 rn->expire = ngx_time() + r->expire; | |
| 1332 | |
| 1333 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1334 | |
| 1335 next = rn->waiting; | |
| 1336 rn->waiting = NULL; | |
| 1337 | |
| 1338 /* unlock name mutex */ | |
| 1339 | |
| 1340 while (next) { | |
| 1341 ctx = next; | |
| 1342 ctx->state = NGX_OK; | |
| 1343 ctx->naddrs = naddrs; | |
| 1344 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 1345 ctx->addr = addr; | |
| 1346 next = ctx->next; | |
| 1347 | |
| 1348 ctx->handler(ctx); | |
| 1349 } | |
| 1350 | |
|
2483
29494780d978
free addrs only it has been allocated before: non single address
Igor Sysoev <igor@sysoev.ru>
parents:
2482
diff
changeset
|
1351 if (naddrs > 1) { |
| 1649 | 1352 ngx_resolver_free(r, addrs); |
| 1353 } | |
| 1354 | |
| 1355 return; | |
| 1356 | |
| 1357 } else if (cname) { | |
| 1358 | |
| 1359 /* CNAME only */ | |
| 1360 | |
| 1361 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) { | |
| 1362 return; | |
| 1363 } | |
| 1364 | |
| 1365 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1366 "resolver cname:\"%V\"", &name); | |
| 1367 | |
|
1741
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1368 ngx_queue_remove(&rn->queue); |
|
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1369 |
| 1649 | 1370 rn->cnlen = (u_short) name.len; |
| 1371 rn->u.cname = name.data; | |
| 1372 rn->valid = ngx_time() + r->valid; | |
| 1373 rn->expire = ngx_time() + r->expire; | |
| 1374 | |
| 1375 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1376 | |
| 1377 ctx = rn->waiting; | |
| 1378 rn->waiting = NULL; | |
| 1379 | |
| 1380 if (ctx) { | |
| 1381 ctx->name = name; | |
| 1382 | |
| 1383 (void) ngx_resolve_name_locked(r, ctx); | |
| 1384 } | |
| 1385 | |
| 1386 return; | |
| 1387 } | |
| 1388 | |
| 1389 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
|
1390 "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
|
1391 qtype); |
| 1649 | 1392 return; |
| 1393 | |
| 1394 short_response: | |
| 1395 | |
| 1396 err = "short dns response"; | |
| 1397 | |
| 1398 invalid: | |
| 1399 | |
| 1400 /* unlock name mutex */ | |
| 1401 | |
| 1402 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1403 | |
| 1404 return; | |
| 1405 | |
| 1406 failed: | |
| 1407 | |
| 1408 /* unlock name mutex */ | |
| 1409 | |
| 3139 | 1410 ngx_resolver_free(r, name.data); |
| 1411 | |
| 1649 | 1412 return; |
| 1413 } | |
| 1414 | |
| 1415 | |
| 1416 static void | |
| 1417 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
|
1418 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan) |
| 1649 | 1419 { |
| 1420 char *err; | |
| 1421 size_t len; | |
| 1422 in_addr_t addr; | |
| 1423 ngx_int_t digit; | |
| 1424 ngx_str_t name; | |
| 1425 ngx_uint_t i, mask, qtype, qclass, qident; | |
| 1426 ngx_resolver_an_t *an; | |
| 1427 ngx_resolver_ctx_t *ctx, *next; | |
| 1428 ngx_resolver_node_t *rn; | |
| 1429 | |
| 1430 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) { | |
| 1431 goto invalid_in_addr_arpa; | |
| 1432 } | |
| 1433 | |
| 1434 addr = 0; | |
| 1435 i = 12; | |
| 1436 | |
| 1437 for (mask = 0; mask < 32; mask += 8) { | |
| 1438 len = buf[i++]; | |
| 1439 | |
| 1440 digit = ngx_atoi(&buf[i], len); | |
| 1441 if (digit == NGX_ERROR || digit > 255) { | |
| 1442 goto invalid_in_addr_arpa; | |
| 1443 } | |
| 1444 | |
| 1445 addr += digit << mask; | |
| 1446 i += len; | |
| 1447 } | |
| 1448 | |
| 1449 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) { | |
| 1450 goto invalid_in_addr_arpa; | |
| 1451 } | |
| 1452 | |
| 1453 /* lock addr mutex */ | |
| 1454 | |
| 1455 rn = ngx_resolver_lookup_addr(r, addr); | |
| 1456 | |
| 1457 if (rn == NULL || rn->query == NULL) { | |
| 1458 ngx_log_error(r->log_level, r->log, 0, | |
| 1459 "unexpected response for %ud.%ud.%ud.%ud", | |
| 1460 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 1461 (addr >> 8) & 0xff, addr & 0xff); | |
| 1462 goto failed; | |
| 1463 } | |
| 1464 | |
| 1465 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 1466 | |
| 1467 if (ident != qident) { | |
| 1468 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
|
1469 "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
|
1470 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff, |
|
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1471 (addr >> 8) & 0xff, addr & 0xff, qident); |
| 1649 | 1472 goto failed; |
| 1473 } | |
| 1474 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1475 if (code == 0 && nan == 0) { |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1476 code = 3; /* NXDOMAIN */ |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1477 } |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1478 |
| 1649 | 1479 if (code) { |
| 1480 next = rn->waiting; | |
| 1481 rn->waiting = NULL; | |
| 1482 | |
| 1483 ngx_queue_remove(&rn->queue); | |
| 1484 | |
| 1485 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 1486 | |
| 1487 ngx_resolver_free_node(r, rn); | |
| 1488 | |
| 1489 /* unlock addr mutex */ | |
| 1490 | |
| 1491 while (next) { | |
| 1492 ctx = next; | |
| 1493 ctx->state = code; | |
| 1494 next = ctx->next; | |
| 1495 | |
| 1496 ctx->handler(ctx); | |
| 1497 } | |
| 1498 | |
| 1499 return; | |
| 1500 } | |
| 1501 | |
| 1502 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t); | |
| 1503 | |
| 1504 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) { | |
| 1505 goto short_response; | |
| 1506 } | |
| 1507 | |
| 1508 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */ | |
| 1509 | |
| 1510 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) { | |
| 1511 err = "invalid in-addr.arpa name in DNS response"; | |
| 1512 goto invalid; | |
| 1513 } | |
| 1514 | |
| 1515 an = (ngx_resolver_an_t *) &buf[i + 2]; | |
| 1516 | |
| 1517 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1518 qclass = (an->class_hi << 8) + an->class_lo; | |
| 1519 len = (an->len_hi << 8) + an->len_lo; | |
| 1520 | |
| 1521 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
|
1522 "resolver qt:%ui cl:%ui len:%uz", qtype, qclass, len); |
| 1649 | 1523 |
| 1524 i += 2 + sizeof(ngx_resolver_an_t); | |
| 1525 | |
| 1526 if (i + len > (ngx_uint_t) n) { | |
| 1527 goto short_response; | |
| 1528 } | |
| 1529 | |
| 1530 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) { | |
| 1531 return; | |
| 1532 } | |
| 1533 | |
| 1534 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name); | |
| 1535 | |
|
2486
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1536 if (name.len != (size_t) rn->nlen |
|
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1537 || ngx_strncmp(name.data, rn->name, name.len) != 0) |
| 1649 | 1538 { |
|
2482
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1539 if (rn->nlen) { |
|
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1540 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
|
1541 } |
|
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1542 |
|
2490
1c87647b7ca5
fix building by msvc, introduced in r2487
Igor Sysoev <igor@sysoev.ru>
parents:
2487
diff
changeset
|
1543 rn->nlen = (u_short) name.len; |
| 1649 | 1544 rn->name = name.data; |
| 1545 | |
|
2486
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1546 name.data = ngx_resolver_dup(r, rn->name, name.len); |
| 1649 | 1547 if (name.data == NULL) { |
| 1548 goto failed; | |
| 1549 } | |
| 1550 } | |
| 1551 | |
| 1552 ngx_queue_remove(&rn->queue); | |
| 1553 | |
| 1554 rn->valid = ngx_time() + r->valid; | |
| 1555 rn->expire = ngx_time() + r->expire; | |
| 1556 | |
| 1557 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
| 1558 | |
| 1559 next = rn->waiting; | |
| 1560 rn->waiting = NULL; | |
| 1561 | |
| 1562 /* unlock addr mutex */ | |
| 1563 | |
| 1564 while (next) { | |
| 1565 ctx = next; | |
| 1566 ctx->state = NGX_OK; | |
| 1567 ctx->name = name; | |
| 1568 next = ctx->next; | |
| 1569 | |
| 1570 ctx->handler(ctx); | |
| 1571 } | |
| 1572 | |
| 1573 ngx_resolver_free(r, name.data); | |
| 1574 | |
| 1575 return; | |
| 1576 | |
| 1577 invalid_in_addr_arpa: | |
| 1578 | |
| 1579 ngx_log_error(r->log_level, r->log, 0, | |
| 1580 "invalid in-addr.arpa name in DNS response"); | |
| 1581 return; | |
| 1582 | |
| 1583 short_response: | |
| 1584 | |
| 1585 err = "short DNS response"; | |
| 1586 | |
| 1587 invalid: | |
| 1588 | |
| 1589 /* unlock addr mutex */ | |
| 1590 | |
| 1591 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1592 | |
| 1593 return; | |
| 1594 | |
| 1595 failed: | |
| 1596 | |
| 1597 /* unlock addr mutex */ | |
| 1598 | |
| 1599 return; | |
| 1600 } | |
| 1601 | |
| 1602 | |
| 1603 static ngx_resolver_node_t * | |
| 1604 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) | |
| 1605 { | |
| 1606 ngx_int_t rc; | |
| 1607 ngx_rbtree_node_t *node, *sentinel; | |
| 1608 ngx_resolver_node_t *rn; | |
| 1609 | |
| 1610 node = r->name_rbtree.root; | |
| 1611 sentinel = r->name_rbtree.sentinel; | |
| 1612 | |
| 1613 while (node != sentinel) { | |
| 1614 | |
| 1615 if (hash < node->key) { | |
| 1616 node = node->left; | |
| 1617 continue; | |
| 1618 } | |
| 1619 | |
| 1620 if (hash > node->key) { | |
| 1621 node = node->right; | |
| 1622 continue; | |
| 1623 } | |
| 1624 | |
| 1625 /* hash == node->key */ | |
| 1626 | |
| 1627 do { | |
| 1628 rn = (ngx_resolver_node_t *) node; | |
| 1629 | |
|
3143
ab6258e18099
fix resolver cache rbtree comparison
Igor Sysoev <igor@sysoev.ru>
parents:
3139
diff
changeset
|
1630 rc = ngx_memn2cmp(name->data, rn->name, name->len, rn->nlen); |
| 1649 | 1631 |
| 1632 if (rc == 0) { | |
| 1633 return rn; | |
| 1634 } | |
| 1635 | |
| 1636 node = (rc < 0) ? node->left : node->right; | |
| 1637 | |
| 1638 } while (node != sentinel && hash == node->key); | |
| 1639 | |
| 1640 break; | |
| 1641 } | |
| 1642 | |
| 1643 /* not found */ | |
| 1644 | |
| 1645 return NULL; | |
| 1646 } | |
| 1647 | |
| 1648 | |
| 1649 static ngx_resolver_node_t * | |
| 1650 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr) | |
| 1651 { | |
| 1652 ngx_rbtree_node_t *node, *sentinel; | |
| 1653 | |
| 1654 node = r->addr_rbtree.root; | |
| 1655 sentinel = r->addr_rbtree.sentinel; | |
| 1656 | |
| 1657 while (node != sentinel) { | |
| 1658 | |
| 1659 if (addr < node->key) { | |
| 1660 node = node->left; | |
| 1661 continue; | |
| 1662 } | |
| 1663 | |
| 1664 if (addr > node->key) { | |
| 1665 node = node->right; | |
| 1666 continue; | |
| 1667 } | |
| 1668 | |
| 1669 /* addr == node->key */ | |
| 1670 | |
| 1671 return (ngx_resolver_node_t *) node; | |
| 1672 } | |
| 1673 | |
| 1674 /* not found */ | |
| 1675 | |
| 1676 return NULL; | |
| 1677 } | |
| 1678 | |
| 1679 | |
| 1680 static void | |
| 1681 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
| 1682 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
| 1683 { | |
| 1684 ngx_rbtree_node_t **p; | |
| 1685 ngx_resolver_node_t *rn, *rn_temp; | |
| 1686 | |
| 1687 for ( ;; ) { | |
| 1688 | |
| 1689 if (node->key < temp->key) { | |
| 1690 | |
| 1691 p = &temp->left; | |
| 1692 | |
| 1693 } else if (node->key > temp->key) { | |
| 1694 | |
| 1695 p = &temp->right; | |
| 1696 | |
| 1697 } else { /* node->key == temp->key */ | |
| 1698 | |
| 1699 rn = (ngx_resolver_node_t *) node; | |
| 1700 rn_temp = (ngx_resolver_node_t *) temp; | |
| 1701 | |
|
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|
1702 p = (ngx_memn2cmp(rn->name, rn_temp->name, rn->nlen, rn_temp->nlen) |
|
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|
1703 < 0) ? &temp->left : &temp->right; |
| 1649 | 1704 } |
| 1705 | |
| 1706 if (*p == sentinel) { | |
| 1707 break; | |
| 1708 } | |
| 1709 | |
| 1710 temp = *p; | |
| 1711 } | |
| 1712 | |
| 1713 *p = node; | |
| 1714 node->parent = temp; | |
| 1715 node->left = sentinel; | |
| 1716 node->right = sentinel; | |
| 1717 ngx_rbt_red(node); | |
| 1718 } | |
| 1719 | |
| 1720 | |
| 1721 static ngx_int_t | |
| 1722 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1723 { | |
| 1724 u_char *p, *s; | |
|
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|
1725 size_t len, nlen; |
| 1649 | 1726 ngx_uint_t ident; |
| 1727 ngx_resolver_qs_t *qs; | |
| 1728 ngx_resolver_query_t *query; | |
| 1729 | |
|
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|
1730 nlen = ctx->name.len ? (1 + ctx->name.len + 1) : 1; |
|
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diff
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|
1731 |
|
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diff
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|
1732 len = sizeof(ngx_resolver_query_t) + nlen + sizeof(ngx_resolver_qs_t); |
| 1649 | 1733 |
|
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changeset
|
1734 p = ngx_resolver_alloc(ctx->resolver, len); |
| 1649 | 1735 if (p == NULL) { |
| 1736 return NGX_ERROR; | |
| 1737 } | |
| 1738 | |
| 1739 rn->qlen = (u_short) len; | |
| 1740 rn->query = p; | |
| 1741 | |
| 1742 query = (ngx_resolver_query_t *) p; | |
| 1743 | |
| 1744 ident = ngx_random(); | |
| 1745 | |
| 1746 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0, | |
| 1747 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff); | |
| 1748 | |
| 1749 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1750 query->ident_lo = (u_char) (ident & 0xff); | |
| 1751 | |
| 1752 /* recursion query */ | |
| 1753 query->flags_hi = 1; query->flags_lo = 0; | |
| 1754 | |
| 1755 /* one question */ | |
| 1756 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1757 query->nan_hi = 0; query->nan_lo = 0; | |
| 1758 query->nns_hi = 0; query->nns_lo = 0; | |
| 1759 query->nar_hi = 0; query->nar_lo = 0; | |
| 1760 | |
|
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|
1761 p += sizeof(ngx_resolver_query_t) + nlen; |
| 1649 | 1762 |
| 1763 qs = (ngx_resolver_qs_t *) p; | |
| 1764 | |
| 1765 /* query type */ | |
| 1766 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type; | |
| 1767 | |
| 1768 /* IP query class */ | |
| 1769 qs->class_hi = 0; qs->class_lo = 1; | |
| 1770 | |
| 1771 /* convert "www.example.com" to "\3www\7example\3com\0" */ | |
| 1772 | |
| 1773 len = 0; | |
| 1774 p--; | |
| 1775 *p-- = '\0'; | |
| 1776 | |
| 1777 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) { | |
| 1778 if (*s != '.') { | |
| 1779 *p = *s; | |
| 1780 len++; | |
| 1781 | |
| 1782 } else { | |
|
1961
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1960
diff
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|
1783 if (len == 0) { |
|
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|
1784 return NGX_DECLINED; |
|
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diff
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|
1785 } |
|
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diff
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|
1786 |
| 1649 | 1787 *p = (u_char) len; |
| 1788 len = 0; | |
| 1789 } | |
| 1790 | |
| 1791 p--; | |
| 1792 } | |
| 1793 | |
| 1794 *p = (u_char) len; | |
| 1795 | |
| 1796 return NGX_OK; | |
| 1797 } | |
| 1798 | |
| 1799 | |
| 1800 /* AF_INET only */ | |
| 1801 | |
| 1802 static ngx_int_t | |
| 1803 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1804 { | |
| 1805 u_char *p, *d; | |
| 1806 size_t len; | |
| 1807 ngx_int_t n; | |
| 1808 ngx_uint_t ident; | |
| 1809 ngx_resolver_query_t *query; | |
| 1810 | |
| 1811 len = sizeof(ngx_resolver_query_t) | |
| 1812 + sizeof(".255.255.255.255.in-addr.arpa.") - 1 | |
| 1813 + sizeof(ngx_resolver_qs_t); | |
| 1814 | |
|
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diff
changeset
|
1815 p = ngx_resolver_alloc(ctx->resolver, len); |
| 1649 | 1816 if (p == NULL) { |
| 1817 return NGX_ERROR; | |
| 1818 } | |
| 1819 | |
| 1820 rn->query = p; | |
| 1821 query = (ngx_resolver_query_t *) p; | |
| 1822 | |
| 1823 ident = ngx_random(); | |
| 1824 | |
| 1825 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1826 query->ident_lo = (u_char) (ident & 0xff); | |
| 1827 | |
| 1828 /* recursion query */ | |
| 1829 query->flags_hi = 1; query->flags_lo = 0; | |
| 1830 | |
| 1831 /* one question */ | |
| 1832 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1833 query->nan_hi = 0; query->nan_lo = 0; | |
| 1834 query->nns_hi = 0; query->nns_lo = 0; | |
| 1835 query->nar_hi = 0; query->nar_lo = 0; | |
| 1836 | |
| 1837 p += sizeof(ngx_resolver_query_t); | |
| 1838 | |
| 1839 for (n = 0; n < 32; n += 8){ | |
| 1840 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff); | |
| 1841 *p = (u_char) (d - &p[1]); | |
| 1842 p = d; | |
| 1843 } | |
| 1844 | |
| 1845 /* query type "PTR", IP query class */ | |
| 1846 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18); | |
| 1847 | |
| 1848 rn->qlen = (u_short) | |
| 1849 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t) | |
| 1850 - rn->query); | |
| 1851 | |
| 1852 return NGX_OK; | |
| 1853 } | |
| 1854 | |
| 1855 | |
| 1856 static ngx_int_t | |
| 1857 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src, | |
| 1858 u_char *last) | |
| 1859 { | |
| 1860 char *err; | |
| 1861 u_char *p, *dst; | |
| 1862 ssize_t len; | |
| 1863 ngx_uint_t i, n; | |
| 1864 | |
| 1865 p = src; | |
| 1866 len = -1; | |
| 1867 | |
| 1868 /* | |
| 1869 * compression pointers allow to create endless loop, so we set limit; | |
| 1870 * 128 pointers should be enough to store 255-byte name | |
| 1871 */ | |
| 1872 | |
| 1873 for (i = 0; i < 128; i++) { | |
| 1874 n = *p++; | |
| 1875 | |
| 1876 if (n == 0) { | |
| 1877 goto done; | |
| 1878 } | |
| 1879 | |
| 1880 if (n & 0xc0) { | |
|
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|
1881 n = ((n & 0x3f) << 8) + *p; |
| 1649 | 1882 p = &buf[n]; |
| 1883 | |
| 1884 } else { | |
| 1885 len += 1 + n; | |
| 1886 p = &p[n]; | |
| 1887 } | |
| 1888 | |
| 1889 if (p >= last) { | |
| 1890 err = "name is out of response"; | |
| 1891 goto invalid; | |
| 1892 } | |
| 1893 } | |
| 1894 | |
| 1895 err = "compression pointers loop"; | |
| 1896 | |
| 1897 invalid: | |
| 1898 | |
| 1899 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1900 | |
| 1901 return NGX_ERROR; | |
| 1902 | |
| 1903 done: | |
| 1904 | |
| 1905 if (name == NULL) { | |
| 583 | 1906 return NGX_OK; |
| 1907 } | |
| 1908 | |
|
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|
1909 if (len == -1) { |
|
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diff
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|
1910 name->len = 0; |
|
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|
1911 name->data = NULL; |
|
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|
1912 return NGX_OK; |
|
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|
1913 } |
|
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|
1914 |
| 1649 | 1915 dst = ngx_resolver_alloc(r, len); |
| 1916 if (dst == NULL) { | |
| 1917 return NGX_ERROR; | |
| 1918 } | |
| 1919 | |
| 1920 name->data = dst; | |
| 1921 | |
| 1922 n = *src++; | |
| 1923 | |
| 1924 for ( ;; ) { | |
| 1925 if (n != 0xc0) { | |
| 1926 ngx_memcpy(dst, src, n); | |
| 1927 dst += n; | |
| 1928 src += n; | |
| 1929 | |
| 1930 n = *src++; | |
| 1931 | |
| 1932 if (n != 0) { | |
| 1933 *dst++ = '.'; | |
| 1934 } | |
| 1935 | |
| 1936 } else { | |
|
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diff
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|
1937 n = ((n & 0x3f) << 8) + *src; |
| 1649 | 1938 src = &buf[n]; |
| 1939 | |
| 1940 n = *src++; | |
| 1941 } | |
| 1942 | |
| 1943 if (n == 0) { | |
| 1944 name->len = dst - name->data; | |
| 1945 return NGX_OK; | |
| 1946 } | |
| 1947 } | |
| 1948 } | |
| 1949 | |
| 1950 | |
| 1951 static void | |
| 1952 ngx_resolver_timeout_handler(ngx_event_t *ev) | |
| 1953 { | |
| 1954 ngx_resolver_ctx_t *ctx; | |
| 1955 | |
| 1956 ctx = ev->data; | |
| 1957 | |
| 1958 ctx->state = NGX_RESOLVE_TIMEDOUT; | |
| 1959 | |
| 1960 ctx->handler(ctx); | |
| 1961 } | |
| 1962 | |
| 1963 | |
| 1964 static void | |
| 1965 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 1966 { | |
| 1967 /* lock alloc mutex */ | |
| 1968 | |
| 1969 if (rn->query) { | |
| 1970 ngx_resolver_free_locked(r, rn->query); | |
| 1971 } | |
| 1972 | |
| 1973 if (rn->name) { | |
| 1974 ngx_resolver_free_locked(r, rn->name); | |
| 1975 } | |
| 1976 | |
| 1977 if (rn->cnlen) { | |
| 1978 ngx_resolver_free_locked(r, rn->u.cname); | |
| 1979 } | |
| 1980 | |
| 1981 if (rn->naddrs > 1) { | |
| 1982 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 1983 } | |
| 1984 | |
| 1985 ngx_resolver_free_locked(r, rn); | |
| 1986 | |
| 1987 /* unlock alloc mutex */ | |
| 1988 } | |
| 1989 | |
| 1990 | |
| 1991 static void * | |
| 1992 ngx_resolver_alloc(ngx_resolver_t *r, size_t size) | |
| 1993 { | |
| 1994 u_char *p; | |
| 1995 | |
| 1996 /* lock alloc mutex */ | |
| 1997 | |
| 1998 p = ngx_alloc(size, r->log); | |
| 1999 | |
| 2000 /* unlock alloc mutex */ | |
| 2001 | |
| 2002 return p; | |
| 2003 } | |
| 2004 | |
| 2005 | |
| 1903 | 2006 static void * |
| 1649 | 2007 ngx_resolver_calloc(ngx_resolver_t *r, size_t size) |
| 2008 { | |
| 2009 u_char *p; | |
| 2010 | |
| 2011 p = ngx_resolver_alloc(r, size); | |
| 2012 | |
| 2013 if (p) { | |
| 2014 ngx_memzero(p, size); | |
| 2015 } | |
| 2016 | |
| 2017 return p; | |
| 2018 } | |
| 2019 | |
| 2020 | |
| 2021 static void | |
| 2022 ngx_resolver_free(ngx_resolver_t *r, void *p) | |
| 2023 { | |
| 2024 /* lock alloc mutex */ | |
| 2025 | |
| 2026 ngx_free(p); | |
| 2027 | |
| 2028 /* unlock alloc mutex */ | |
| 2029 } | |
| 2030 | |
| 2031 | |
| 2032 static void | |
| 2033 ngx_resolver_free_locked(ngx_resolver_t *r, void *p) | |
| 2034 { | |
| 2035 ngx_free(p); | |
| 2036 } | |
| 2037 | |
| 2038 | |
| 2039 static void * | |
| 2040 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size) | |
| 2041 { | |
| 2042 void *dst; | |
| 2043 | |
| 2044 dst = ngx_resolver_alloc(r, size); | |
| 2045 | |
| 2046 if (dst == NULL) { | |
| 2047 return dst; | |
| 2048 } | |
| 2049 | |
| 2050 ngx_memcpy(dst, src, size); | |
| 2051 | |
| 2052 return dst; | |
| 2053 } | |
| 2054 | |
| 2055 | |
| 2056 char * | |
| 2057 ngx_resolver_strerror(ngx_int_t err) | |
| 2058 { | |
| 2059 static char *errors[] = { | |
| 2060 "Format error", /* FORMERR */ | |
| 2061 "Server failure", /* SERVFAIL */ | |
| 2062 "Host not found", /* NXDOMAIN */ | |
| 2063 "Unimplemented", /* NOTIMP */ | |
| 2064 "Operation refused" /* REFUSED */ | |
| 2065 }; | |
| 2066 | |
| 2067 if (err > 0 && err < 6) { | |
| 2068 return errors[err - 1]; | |
| 2069 } | |
| 2070 | |
| 2071 if (err == NGX_RESOLVE_TIMEDOUT) { | |
| 2072 return "Operation timed out"; | |
| 2073 } | |
| 2074 | |
| 2075 return "Unknown error"; | |
| 2076 } | |
| 2077 | |
| 2078 | |
|
3408
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diff
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|
2079 static u_char * |
|
71193a456616
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diff
changeset
|
2080 ngx_resolver_log_error(ngx_log_t *log, u_char *buf, size_t len) |
|
71193a456616
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diff
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|
2081 { |
|
71193a456616
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diff
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|
2082 u_char *p; |
|
71193a456616
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diff
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|
2083 ngx_udp_connection_t *uc; |
|
71193a456616
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3376
diff
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|
2084 |
|
71193a456616
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diff
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|
2085 p = buf; |
|
71193a456616
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parents:
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diff
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|
2086 |
|
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3376
diff
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|
2087 if (log->action) { |
|
71193a456616
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|
2088 p = ngx_snprintf(buf, len, " while %s", log->action); |
|
71193a456616
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|
2089 len -= p - buf; |
|
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|
2090 } |
|
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|
2091 |
|
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|
2092 uc = log->data; |
|
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|
2093 |
|
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|
2094 if (uc) { |
|
71193a456616
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3376
diff
changeset
|
2095 p = ngx_snprintf(p, len, ", resolver: %V", &uc->server); |
|
71193a456616
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|
2096 } |
|
71193a456616
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|
2097 |
|
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Igor Sysoev <igor@sysoev.ru>
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|
2098 return p; |
|
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2099 } |
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2100 |
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2101 |
| 1649 | 2102 ngx_int_t |
| 2103 ngx_udp_connect(ngx_udp_connection_t *uc) | |
| 2104 { | |
| 2105 int rc; | |
| 2106 ngx_int_t event; | |
| 2107 ngx_event_t *rev, *wev; | |
| 2108 ngx_socket_t s; | |
| 2109 ngx_connection_t *c; | |
| 2110 | |
| 583 | 2111 s = ngx_socket(AF_INET, SOCK_DGRAM, 0); |
| 2112 | |
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2113 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, &uc->log, 0, "UDP socket %d", s); |
| 583 | 2114 |
| 2115 if (s == -1) { | |
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2116 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
| 583 | 2117 ngx_socket_n " failed"); |
| 2118 return NGX_ERROR; | |
| 2119 } | |
| 2120 | |
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2121 c = ngx_get_connection(s, &uc->log); |
| 583 | 2122 |
| 2123 if (c == NULL) { | |
| 2124 if (ngx_close_socket(s) == -1) { | |
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2125 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
| 583 | 2126 ngx_close_socket_n "failed"); |
| 2127 } | |
| 2128 | |
| 2129 return NGX_ERROR; | |
| 2130 } | |
| 2131 | |
| 1649 | 2132 if (ngx_nonblocking(s) == -1) { |
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2133 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
| 1649 | 2134 ngx_nonblocking_n " failed"); |
| 2135 | |
| 2136 ngx_free_connection(c); | |
| 2137 | |
| 2138 if (ngx_close_socket(s) == -1) { | |
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2139 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
| 1649 | 2140 ngx_close_socket_n " failed"); |
| 2141 } | |
| 2142 | |
| 2143 return NGX_ERROR; | |
| 2144 } | |
| 2145 | |
| 583 | 2146 rev = c->read; |
| 2147 wev = c->write; | |
| 2148 | |
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2149 rev->log = &uc->log; |
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2150 wev->log = &uc->log; |
| 1649 | 2151 |
| 2152 uc->connection = c; | |
| 583 | 2153 |
| 2154 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); | |
| 2155 | |
| 2156 #if (NGX_THREADS) | |
| 1649 | 2157 |
| 2158 /* TODO: lock event when call completion handler */ | |
| 2159 | |
| 2160 rev->lock = &c->lock; | |
| 2161 wev->lock = &c->lock; | |
| 583 | 2162 rev->own_lock = &c->lock; |
| 2163 wev->own_lock = &c->lock; | |
| 1649 | 2164 |
| 583 | 2165 #endif |
| 2166 | |
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2167 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, &uc->log, 0, |
| 1649 | 2168 "connect to %V, fd:%d #%d", &uc->server, s, c->number); |
| 2169 | |
| 2170 rc = connect(s, uc->sockaddr, uc->socklen); | |
| 2171 | |
| 2172 /* TODO: aio, iocp */ | |
| 583 | 2173 |
| 2174 if (rc == -1) { | |
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2175 ngx_log_error(NGX_LOG_CRIT, &uc->log, ngx_socket_errno, |
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2176 "connect() failed"); |
| 583 | 2177 |
| 2178 return NGX_ERROR; | |
| 2179 } | |
| 2180 | |
| 1649 | 2181 /* UDP sockets are always ready to write */ |
| 2182 wev->ready = 1; | |
| 2183 | |
| 2184 if (ngx_add_event) { | |
| 2185 | |
| 2186 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ? | |
| 2187 /* kqueue, epoll */ NGX_CLEAR_EVENT: | |
| 2188 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT; | |
| 2189 /* eventport event type has no meaning: oneshot only */ | |
| 2190 | |
| 2191 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { | |
| 2192 return NGX_ERROR; | |
| 2193 } | |
| 2194 | |
| 2195 } else { | |
| 2196 /* rtsig */ | |
| 2197 | |
| 583 | 2198 if (ngx_add_conn(c) == NGX_ERROR) { |
| 2199 return NGX_ERROR; | |
| 2200 } | |
| 2201 } | |
| 2202 | |
| 2203 return NGX_OK; | |
| 2204 } |