Mercurial > hg > nginx
annotate src/core/ngx_resolver.c @ 1880:d8de75fe31ec
fix r1879
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Wed, 06 Feb 2008 17:23:17 +0000 |
| parents | cf4ee321d195 |
| children | 1ea922585517 |
| 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 | |
| 53 static ngx_int_t ngx_resolve_name_locked(ngx_resolver_t *r, | |
| 54 ngx_resolver_ctx_t *ctx); | |
| 55 static void ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
| 56 ngx_queue_t *queue); | |
| 57 static ngx_int_t ngx_resolver_send_query(ngx_resolver_t *r, | |
| 58 ngx_resolver_node_t *rn); | |
| 59 static ngx_int_t ngx_resolver_create_name_query(ngx_resolver_node_t *rn, | |
| 60 ngx_resolver_ctx_t *ctx); | |
| 61 static ngx_int_t ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, | |
| 62 ngx_resolver_ctx_t *ctx); | |
| 63 static void ngx_resolver_resend_handler(ngx_event_t *ev); | |
| 64 static time_t ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
| 65 ngx_queue_t *queue); | |
| 66 static void ngx_resolver_read_response(ngx_event_t *rev); | |
| 67 static void ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, | |
| 68 size_t n); | |
| 69 static void ngx_resolver_process_a(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
|
70 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans); |
| 1649 | 71 static void 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
|
72 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan); |
| 1649 | 73 static ngx_resolver_node_t *ngx_resolver_lookup_name(ngx_resolver_t *r, |
| 74 ngx_str_t *name, uint32_t hash); | |
| 75 static ngx_resolver_node_t *ngx_resolver_lookup_addr(ngx_resolver_t *r, | |
| 76 in_addr_t addr); | |
| 77 static void ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
| 78 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel); | |
| 79 static ngx_int_t ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, | |
| 80 u_char *buf, u_char *src, u_char *last); | |
| 81 static void ngx_resolver_timeout_handler(ngx_event_t *ev); | |
| 82 static void ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn); | |
| 83 static void *ngx_resolver_alloc(ngx_resolver_t *r, size_t size); | |
| 84 static void ngx_resolver_free(ngx_resolver_t *r, void *p); | |
| 85 static void ngx_resolver_free_locked(ngx_resolver_t *r, void *p); | |
| 86 static void *ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size); | |
| 87 | |
| 88 | |
| 89 /* STUB: ngx_peer_addr_t * */ | |
| 90 | |
| 91 ngx_resolver_t * | |
| 92 ngx_resolver_create(ngx_peer_addr_t *addr, ngx_log_t *log) | |
| 93 { | |
| 94 ngx_resolver_t *r; | |
| 95 ngx_udp_connection_t *uc; | |
| 96 | |
| 97 r = ngx_calloc(sizeof(ngx_resolver_t), log); | |
| 98 if (r == NULL) { | |
| 99 return NULL; | |
| 100 } | |
| 101 | |
| 102 r->event = ngx_calloc(sizeof(ngx_event_t), log); | |
| 103 if (r->event == NULL) { | |
| 104 return NULL; | |
| 105 } | |
| 106 | |
| 1687 | 107 ngx_rbtree_init(&r->name_rbtree, &r->name_sentinel, |
| 108 ngx_resolver_rbtree_insert_value); | |
| 109 | |
| 110 ngx_rbtree_init(&r->addr_rbtree, &r->addr_sentinel, | |
| 111 ngx_rbtree_insert_value); | |
| 1649 | 112 |
| 1685 | 113 ngx_queue_init(&r->name_resend_queue); |
| 114 ngx_queue_init(&r->addr_resend_queue); | |
| 115 | |
| 116 ngx_queue_init(&r->name_expire_queue); | |
| 117 ngx_queue_init(&r->addr_expire_queue); | |
| 1649 | 118 |
| 119 r->event->handler = ngx_resolver_resend_handler; | |
| 120 r->event->data = r; | |
| 121 r->event->log = log; | |
| 122 r->ident = -1; | |
| 123 | |
| 124 r->resend_timeout = 5; | |
| 125 r->expire = 30; | |
| 126 r->valid = 300; | |
| 127 | |
| 128 r->log = log; | |
| 129 r->log_level = NGX_LOG_ALERT; | |
| 130 | |
|
1683
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
|
131 if (addr) { |
|
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
|
132 uc = ngx_calloc(sizeof(ngx_udp_connection_t), log); |
|
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
|
133 if (uc == NULL) { |
|
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
|
134 return NULL; |
|
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
|
135 } |
|
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
|
136 |
|
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
|
137 r->udp_connection = uc; |
|
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
|
138 |
|
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
|
139 uc->sockaddr = addr->sockaddr; |
|
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
|
140 uc->socklen = addr->socklen; |
|
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
|
141 uc->server = addr->name; |
|
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
|
142 uc->log = log; |
|
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
|
143 } |
| 1649 | 144 |
| 145 return r; | |
| 146 } | |
| 147 | |
| 148 | |
| 149 ngx_resolver_ctx_t * | |
| 150 ngx_resolve_start(ngx_resolver_t *r, ngx_resolver_ctx_t *temp) | |
| 151 { | |
| 152 in_addr_t addr; | |
| 153 ngx_resolver_ctx_t *ctx; | |
| 154 | |
| 155 if (temp) { | |
| 156 addr = ngx_inet_addr(temp->name.data, temp->name.len); | |
| 157 | |
| 158 if (addr != INADDR_NONE) { | |
| 159 temp->resolver = r; | |
| 160 temp->state = NGX_OK; | |
| 161 temp->naddrs = 1; | |
| 162 temp->addrs = &temp->addr; | |
| 163 temp->addr = addr; | |
| 164 temp->quick = 1; | |
| 165 | |
| 166 return temp; | |
| 167 } | |
| 168 } | |
| 169 | |
|
1683
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
|
170 if (r->udp_connection == NULL) { |
|
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
|
171 return NGX_NO_RESOLVER; |
|
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
|
172 } |
|
1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
|
173 |
| 1649 | 174 ctx = ngx_resolver_calloc(r, sizeof(ngx_resolver_ctx_t)); |
| 175 | |
| 176 if (ctx) { | |
| 177 ctx->resolver = r; | |
| 178 } | |
| 179 | |
| 180 return ctx; | |
| 181 } | |
| 182 | |
| 183 | |
| 184 ngx_int_t | |
| 185 ngx_resolve_name(ngx_resolver_ctx_t *ctx) | |
| 186 { | |
| 187 ngx_int_t rc; | |
| 188 ngx_resolver_t *r; | |
| 189 | |
| 190 r = ctx->resolver; | |
| 191 | |
| 192 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 193 "resolve: \"%V\"", &ctx->name); | |
| 194 | |
| 195 if (ctx->quick) { | |
| 196 ctx->handler(ctx); | |
| 197 return NGX_OK; | |
| 198 } | |
| 199 | |
| 200 /* lock name mutex */ | |
| 201 | |
| 202 rc = ngx_resolve_name_locked(r, ctx); | |
| 203 | |
| 204 if (rc == NGX_OK) { | |
| 205 return NGX_OK; | |
| 206 } | |
| 207 | |
| 208 /* unlock name mutex */ | |
| 209 | |
| 210 if (rc == NGX_AGAIN) { | |
| 211 return NGX_OK; | |
| 212 } | |
| 213 | |
| 214 /* lock alloc mutex */ | |
| 215 | |
| 216 if (ctx->event) { | |
| 217 ngx_resolver_free_locked(r, ctx->event); | |
| 1880 | 218 ctx->event = NULL; |
| 1649 | 219 } |
| 220 | |
| 221 /* unlock alloc mutex */ | |
| 222 | |
| 223 return NGX_ERROR; | |
| 224 } | |
| 225 | |
| 226 | |
| 227 void | |
| 228 ngx_resolve_name_done(ngx_resolver_ctx_t *ctx) | |
| 229 { | |
| 230 uint32_t hash; | |
| 231 ngx_resolver_t *r; | |
| 232 ngx_resolver_ctx_t *w, **p; | |
| 233 ngx_resolver_node_t *rn; | |
| 234 | |
| 235 r = ctx->resolver; | |
| 236 | |
| 237 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 238 "resolve name done: %i", ctx->state); | |
| 239 | |
| 240 if (ctx->quick) { | |
| 241 return; | |
| 242 } | |
| 243 | |
| 244 if (ctx->event && ctx->event->timer_set) { | |
| 245 ngx_del_timer(ctx->event); | |
| 246 } | |
| 247 | |
| 248 /* lock name mutex */ | |
| 249 | |
| 250 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
| 251 | |
| 252 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
| 253 | |
| 254 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
| 255 | |
| 256 if (rn) { | |
| 257 p = &rn->waiting; | |
| 258 w = rn->waiting; | |
| 259 | |
| 260 while (w) { | |
| 261 if (w == ctx) { | |
| 262 *p = w->next; | |
| 263 | |
| 264 goto done; | |
| 265 } | |
| 266 | |
| 267 p = &w->next; | |
| 268 w = w->next; | |
| 269 } | |
| 270 } | |
| 271 | |
| 272 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
| 273 "could not cancel %V resolving", &ctx->name); | |
| 274 } | |
| 275 | |
| 276 done: | |
| 277 | |
| 278 ngx_resolver_expire(r, &r->name_rbtree, &r->name_expire_queue); | |
| 279 | |
| 280 /* unlock name mutex */ | |
| 281 | |
| 282 ngx_resolver_free(r, ctx); | |
| 283 } | |
| 284 | |
| 285 | |
| 286 /* NGX_RESOLVE_A only */ | |
| 287 | |
| 288 static ngx_int_t | |
| 289 ngx_resolve_name_locked(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx) | |
| 290 { | |
| 291 uint32_t hash; | |
| 292 in_addr_t addr, *addrs; | |
| 293 ngx_uint_t naddrs; | |
| 294 ngx_resolver_ctx_t *next; | |
| 295 ngx_resolver_node_t *rn; | |
| 296 | |
| 297 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
| 298 | |
| 299 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
| 300 | |
| 301 if (rn) { | |
| 302 | |
| 303 if (rn->valid >= ngx_time()) { | |
| 304 | |
| 305 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
| 306 | |
| 307 ngx_queue_remove(&rn->queue); | |
| 308 | |
| 309 rn->expire = ngx_time() + r->expire; | |
| 310 | |
| 311 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 312 | |
| 313 naddrs = rn->naddrs; | |
| 314 | |
| 315 if (naddrs) { | |
| 316 | |
| 317 /* NGX_RESOLVE_A answer */ | |
| 318 | |
| 319 if (naddrs != 1) { | |
| 320 addr = 0; | |
| 321 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
| 322 naddrs * sizeof(in_addr_t)); | |
| 323 if (addrs == NULL) { | |
| 324 return NGX_ERROR; | |
| 325 } | |
| 326 | |
| 327 } else { | |
| 328 addr = rn->u.addr; | |
| 329 addrs = NULL; | |
| 330 } | |
| 331 | |
| 332 ctx->next = rn->waiting; | |
| 333 rn->waiting = NULL; | |
| 334 | |
| 335 /* unlock name mutex */ | |
| 336 | |
| 337 do { | |
| 338 ctx->state = NGX_OK; | |
| 339 ctx->naddrs = naddrs; | |
| 340 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 341 ctx->addr = addr; | |
| 342 next = ctx->next; | |
| 343 | |
| 344 ctx->handler(ctx); | |
| 345 | |
| 346 ctx = next; | |
| 347 } while (ctx); | |
| 348 | |
| 349 if (addrs) { | |
| 350 ngx_resolver_free(r, addrs); | |
| 351 } | |
| 352 | |
| 353 return NGX_OK; | |
| 354 } | |
| 355 | |
| 356 /* NGX_RESOLVE_CNAME */ | |
| 357 | |
| 358 ctx->name.len = rn->cnlen; | |
| 359 ctx->name.data = rn->u.cname; | |
| 360 | |
| 361 return ngx_resolve_name_locked(r, ctx); | |
| 362 } | |
| 363 | |
| 364 if (rn->waiting) { | |
| 365 | |
| 366 ctx->next = rn->waiting; | |
| 367 rn->waiting = ctx; | |
| 368 | |
| 369 return NGX_AGAIN; | |
| 370 } | |
| 371 | |
| 372 ngx_queue_remove(&rn->queue); | |
| 373 | |
| 374 /* lock alloc mutex */ | |
| 375 | |
| 376 ngx_resolver_free_locked(r, rn->query); | |
| 377 | |
| 378 if (rn->cnlen) { | |
| 379 ngx_resolver_free_locked(r, rn->u.cname); | |
| 380 } | |
| 381 | |
| 382 if (rn->naddrs > 1) { | |
| 383 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 384 } | |
| 385 | |
| 386 /* unlock alloc mutex */ | |
| 387 | |
| 388 } else { | |
| 389 | |
| 390 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
| 391 if (rn == NULL) { | |
| 392 return NGX_ERROR; | |
| 393 } | |
| 394 | |
| 395 rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len); | |
| 396 if (rn->name == NULL) { | |
| 397 ngx_resolver_free(r, rn); | |
| 398 return NGX_ERROR; | |
| 399 } | |
| 400 | |
| 401 rn->node.key = hash; | |
| 402 rn->nlen = (u_short) ctx->name.len; | |
| 403 | |
| 404 ngx_rbtree_insert(&r->name_rbtree, &rn->node); | |
| 405 } | |
| 406 | |
| 407 if (ngx_resolver_create_name_query(rn, ctx) != NGX_OK) { | |
| 408 goto failed; | |
| 409 } | |
| 410 | |
| 411 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
| 412 goto failed; | |
| 413 } | |
| 414 | |
| 415 if (ctx->event == NULL) { | |
| 416 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
| 417 if (ctx->event == NULL) { | |
| 418 goto failed; | |
| 419 } | |
| 420 | |
| 421 ctx->event->handler = ngx_resolver_timeout_handler; | |
| 422 ctx->event->data = ctx; | |
| 423 ctx->event->log = r->log; | |
| 424 ctx->ident = -1; | |
| 425 | |
| 426 ngx_add_timer(ctx->event, ctx->timeout); | |
| 427 } | |
| 428 | |
| 429 if (ngx_queue_empty(&r->name_resend_queue)) { | |
| 430 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
| 431 } | |
| 432 | |
| 433 rn->expire = ngx_time() + r->resend_timeout; | |
| 434 | |
| 435 ngx_queue_insert_head(&r->name_resend_queue, &rn->queue); | |
| 436 | |
| 437 rn->cnlen = 0; | |
| 438 rn->naddrs = 0; | |
| 439 rn->valid = 0; | |
| 440 rn->waiting = ctx; | |
| 441 | |
| 442 ctx->state = NGX_AGAIN; | |
| 443 | |
| 444 return NGX_AGAIN; | |
| 445 | |
| 446 failed: | |
| 447 | |
| 448 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 449 | |
| 450 ngx_resolver_free(r, rn->name); | |
| 451 | |
| 452 ngx_resolver_free(r, rn); | |
| 453 | |
| 454 return NGX_ERROR; | |
| 455 } | |
| 583 | 456 |
| 457 | |
| 458 ngx_int_t | |
| 1649 | 459 ngx_resolve_addr(ngx_resolver_ctx_t *ctx) |
| 460 { | |
| 461 ngx_resolver_t *r; | |
| 462 ngx_resolver_node_t *rn; | |
| 463 | |
| 464 r = ctx->resolver; | |
| 465 | |
| 466 ctx->addr = ntohl(ctx->addr); | |
| 467 | |
| 468 /* lock addr mutex */ | |
| 469 | |
| 470 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
| 471 | |
| 472 if (rn) { | |
| 473 | |
| 474 if (rn->valid >= ngx_time()) { | |
| 475 | |
| 476 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
| 477 | |
| 478 ngx_queue_remove(&rn->queue); | |
| 479 | |
| 480 rn->expire = ngx_time() + r->expire; | |
| 481 | |
| 482 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
| 483 | |
| 484 ctx->name.len = rn->nlen; | |
| 485 ctx->name.data = ngx_resolver_dup(r, rn->name, rn->nlen); | |
| 486 if (ctx->name.data == NULL) { | |
| 487 goto failed; | |
| 488 } | |
| 489 | |
| 490 /* unlock addr mutex */ | |
| 491 | |
| 492 ctx->state = NGX_OK; | |
| 493 | |
| 494 ctx->handler(ctx); | |
| 495 | |
| 496 ngx_resolver_free(r, ctx->name.data); | |
| 497 | |
| 498 return NGX_OK; | |
| 499 } | |
| 500 | |
| 501 if (rn->waiting) { | |
| 502 | |
| 503 ctx->next = rn->waiting; | |
| 504 rn->waiting = ctx; | |
| 505 | |
| 506 return NGX_AGAIN; | |
| 507 } | |
| 508 | |
| 509 ngx_queue_remove(&rn->queue); | |
| 510 | |
| 511 ngx_resolver_free(r, rn->query); | |
| 512 | |
| 513 } else { | |
| 514 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
| 515 if (rn == NULL) { | |
| 516 goto failed; | |
| 517 } | |
| 518 | |
| 519 rn->node.key = ctx->addr; | |
| 520 | |
| 521 ngx_rbtree_insert(&r->addr_rbtree, &rn->node); | |
| 522 } | |
| 523 | |
| 524 if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) { | |
| 525 goto failed; | |
| 526 } | |
| 527 | |
| 528 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
| 529 goto failed; | |
| 530 } | |
| 531 | |
| 532 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
| 533 if (ctx->event == NULL) { | |
| 534 goto failed; | |
| 535 } | |
| 536 | |
| 537 ctx->event->handler = ngx_resolver_timeout_handler; | |
| 538 ctx->event->data = ctx; | |
| 539 ctx->event->log = r->log; | |
| 540 ctx->ident = -1; | |
| 541 | |
| 542 ngx_add_timer(ctx->event, ctx->timeout); | |
| 543 | |
| 544 if (ngx_queue_empty(&r->addr_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->addr_resend_queue, &rn->queue); | |
| 551 | |
| 552 rn->cnlen = 0; | |
| 553 rn->naddrs = 0; | |
| 554 rn->name = NULL; | |
| 555 rn->nlen = 0; | |
| 556 rn->valid = 0; | |
| 557 rn->waiting = ctx; | |
| 558 | |
| 559 /* unlock addr mutex */ | |
| 560 | |
| 561 ctx->state = NGX_AGAIN; | |
| 562 | |
| 563 return NGX_OK; | |
| 564 | |
| 565 failed: | |
| 566 | |
| 567 if (rn) { | |
| 568 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 569 | |
| 570 ngx_resolver_free(r, rn); | |
| 571 } | |
| 572 | |
| 573 /* unlock addr mutex */ | |
| 574 | |
| 575 /* lock alloc mutex */ | |
| 576 | |
| 577 if (ctx->event) { | |
| 578 ngx_resolver_free_locked(r, ctx->event); | |
| 579 } | |
| 580 | |
| 581 ngx_resolver_free_locked(r, ctx); | |
| 582 | |
| 583 /* unlock alloc mutex */ | |
| 584 | |
| 585 return NGX_ERROR; | |
| 586 } | |
| 587 | |
| 588 | |
| 589 void | |
| 590 ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx) | |
| 591 { | |
| 592 in_addr_t addr; | |
| 593 ngx_resolver_t *r; | |
| 594 ngx_resolver_ctx_t *w, **p; | |
| 595 ngx_resolver_node_t *rn; | |
| 596 | |
| 597 r = ctx->resolver; | |
| 598 | |
| 599 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 600 "resolve addr done: %i", ctx->state); | |
| 601 | |
| 602 if (ctx->event && ctx->event->timer_set) { | |
| 603 ngx_del_timer(ctx->event); | |
| 604 } | |
| 605 | |
| 606 /* lock addr mutex */ | |
| 607 | |
| 608 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
| 609 | |
| 610 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
| 611 | |
| 612 if (rn) { | |
| 613 p = &rn->waiting; | |
| 614 w = rn->waiting; | |
| 615 | |
| 616 while (w) { | |
| 617 if (w == ctx) { | |
| 618 *p = w->next; | |
| 619 | |
| 620 goto done; | |
| 621 } | |
| 622 | |
| 623 p = &w->next; | |
| 624 w = w->next; | |
| 625 } | |
| 626 } | |
| 627 | |
| 628 addr = ntohl(ctx->addr); | |
| 629 | |
| 630 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
| 631 "could not cancel %ud.%ud.%ud.%ud resolving", | |
| 632 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 633 (addr >> 8) & 0xff, addr & 0xff); | |
| 634 } | |
| 635 | |
| 636 done: | |
| 637 | |
| 638 ngx_resolver_expire(r, &r->addr_rbtree, &r->addr_expire_queue); | |
| 639 | |
| 640 /* unlock addr mutex */ | |
| 641 | |
| 642 ngx_resolver_free(r, ctx); | |
| 643 } | |
| 644 | |
| 645 | |
| 646 static void | |
| 647 ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 648 { | |
| 649 time_t now; | |
| 650 ngx_uint_t i; | |
| 651 ngx_queue_t *q; | |
| 652 ngx_resolver_node_t *rn; | |
| 653 | |
| 654 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire"); | |
| 655 | |
| 656 now = ngx_time(); | |
| 657 | |
| 658 for (i = 0; i < 2; i++) { | |
| 659 if (ngx_queue_empty(queue)) { | |
| 660 return; | |
| 661 } | |
| 662 | |
| 663 q = ngx_queue_last(queue); | |
| 664 | |
| 665 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 666 | |
| 667 if (now <= rn->expire) { | |
| 668 return; | |
| 669 } | |
| 670 | |
| 1774 | 671 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, |
| 672 "resolver expire \"%*s\"", (size_t) rn->nlen, rn->name); | |
| 1649 | 673 |
| 674 ngx_queue_remove(q); | |
| 675 | |
| 676 ngx_rbtree_delete(tree, &rn->node); | |
| 677 | |
| 678 ngx_resolver_free_node(r, rn); | |
| 679 } | |
| 680 } | |
| 681 | |
| 682 | |
| 683 static ngx_int_t | |
| 684 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 685 { | |
| 686 ssize_t n; | |
| 687 ngx_udp_connection_t *uc; | |
| 688 | |
| 689 uc = r->udp_connection; | |
| 690 | |
| 691 if (uc->connection == NULL) { | |
| 692 if (ngx_udp_connect(uc) != NGX_OK) { | |
| 693 return NGX_ERROR; | |
| 694 } | |
| 695 | |
| 696 uc->connection->data = r; | |
| 697 uc->connection->read->handler = ngx_resolver_read_response; | |
| 698 } | |
| 699 | |
| 700 n = ngx_send(uc->connection, rn->query, rn->qlen); | |
| 701 | |
| 702 if (n == -1) { | |
| 703 return NGX_ERROR; | |
| 704 } | |
| 705 | |
| 706 if ((size_t) n != (size_t) rn->qlen) { | |
| 707 ngx_log_error(NGX_LOG_CRIT, uc->log, 0, "send() incomplete"); | |
| 708 return NGX_ERROR; | |
| 709 } | |
| 710 | |
| 711 return NGX_OK; | |
| 712 } | |
| 713 | |
| 714 | |
| 715 static void | |
| 716 ngx_resolver_resend_handler(ngx_event_t *ev) | |
| 717 { | |
| 718 time_t timer, atimer, ntimer; | |
| 719 ngx_resolver_t *r; | |
| 720 | |
| 721 r = ev->data; | |
| 722 | |
| 723 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 724 "resolver resend handler"); | |
| 725 | |
| 726 /* lock name mutex */ | |
| 727 | |
| 728 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue); | |
| 729 | |
| 730 /* unlock name mutex */ | |
| 731 | |
| 732 /* lock addr mutex */ | |
| 733 | |
| 734 atimer = ngx_resolver_resend(r, &r->addr_rbtree, &r->addr_resend_queue); | |
|
1679
ca317d9b5c09
style fix: remove trailing spaces
Igor Sysoev <igor@sysoev.ru>
parents:
1649
diff
changeset
|
735 |
| 1649 | 736 /* unlock addr mutex */ |
| 737 | |
| 738 if (ntimer == 0) { | |
| 739 timer = atimer; | |
| 740 | |
| 741 } else if (atimer == 0) { | |
| 742 timer = ntimer; | |
| 743 | |
| 744 } else { | |
| 745 timer = (atimer < ntimer) ? atimer : ntimer; | |
| 746 } | |
| 747 | |
| 748 if (timer) { | |
| 749 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000)); | |
| 750 } | |
| 751 } | |
| 752 | |
| 753 | |
| 754 static time_t | |
| 755 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 756 { | |
| 757 time_t now; | |
| 758 ngx_queue_t *q; | |
| 759 ngx_resolver_node_t *rn; | |
| 760 | |
| 761 now = ngx_time(); | |
| 762 | |
| 763 for ( ;; ) { | |
| 764 if (ngx_queue_empty(queue)) { | |
| 765 return 0; | |
| 766 } | |
| 767 | |
| 768 q = ngx_queue_last(queue); | |
| 769 | |
| 770 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 771 | |
| 772 if (now < rn->expire) { | |
| 773 return rn->expire - now; | |
| 774 } | |
| 775 | |
| 1774 | 776 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, |
| 777 "resolver resend \"%*s\" %p", | |
| 778 (size_t) rn->nlen, rn->name, rn->waiting); | |
| 1649 | 779 |
| 780 ngx_queue_remove(q); | |
| 781 | |
| 782 if (rn->waiting) { | |
| 783 | |
| 784 if (ngx_resolver_send_query(r, rn) == NGX_OK) { | |
| 785 | |
| 786 rn->expire = now + r->resend_timeout; | |
| 787 | |
| 788 ngx_queue_insert_head(queue, &rn->queue); | |
| 789 } | |
|
1879
cf4ee321d195
do not delete failed DNS request if there are waiting clients
Igor Sysoev <igor@sysoev.ru>
parents:
1878
diff
changeset
|
790 |
|
cf4ee321d195
do not delete failed DNS request if there are waiting clients
Igor Sysoev <igor@sysoev.ru>
parents:
1878
diff
changeset
|
791 continue; |
| 1649 | 792 } |
| 793 | |
| 794 ngx_rbtree_delete(tree, &rn->node); | |
| 795 | |
| 796 ngx_resolver_free_node(r, rn); | |
| 797 } | |
| 798 } | |
| 799 | |
| 800 | |
| 801 static void | |
| 802 ngx_resolver_read_response(ngx_event_t *rev) | |
| 803 { | |
| 804 ssize_t n; | |
| 805 ngx_connection_t *c; | |
| 806 u_char buf[NGX_RESOLVER_UDP_SIZE]; | |
| 807 | |
| 808 c = rev->data; | |
| 809 | |
| 810 do { | |
| 1689 | 811 n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE); |
| 812 | |
| 813 if (n < 0) { | |
| 1649 | 814 return; |
| 815 } | |
| 816 | |
| 817 ngx_resolver_process_response(c->data, buf, n); | |
| 818 | |
| 819 } while (rev->ready); | |
| 820 } | |
| 821 | |
| 822 | |
| 823 static void | |
| 824 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n) | |
| 825 { | |
| 826 char *err; | |
| 827 size_t len; | |
| 828 ngx_uint_t i, ident, flags, code, nqs, nan, qtype, qclass; | |
| 829 ngx_resolver_qs_t *qs; | |
| 830 ngx_resolver_query_t *query; | |
| 831 | |
| 832 if ((size_t) n < sizeof(ngx_resolver_query_t) + 1) { | |
| 833 goto short_response; | |
| 834 } | |
| 835 | |
| 836 query = (ngx_resolver_query_t *) buf; | |
| 837 | |
| 838 ident = (query->ident_hi << 8) + query->ident_lo; | |
| 839 flags = (query->flags_hi << 8) + query->flags_lo; | |
| 840 nqs = (query->nqs_hi << 8) + query->nqs_lo; | |
| 841 nan = (query->nan_hi << 8) + query->nan_lo; | |
| 842 | |
| 843 ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 844 "resolver DNS response %d fl:%04Xud %d/%d/%d/%d", | |
| 845 ident, flags, nqs, nan, | |
| 846 (query->nns_hi << 8) + query->nns_lo, | |
| 847 (query->nar_hi << 8) + query->nar_lo); | |
| 848 | |
| 849 if (!(flags & 0x8000)) { | |
| 850 ngx_log_error(r->log_level, r->log, 0, | |
| 851 "invalid DNS response %d fl:%04Xud", ident, flags); | |
| 852 return; | |
| 853 } | |
| 854 | |
| 855 code = flags & 0x7f; | |
| 856 | |
| 857 if (code == NGX_RESOLVE_FORMERR || code > NGX_RESOLVE_REFUSED) { | |
| 858 ngx_log_error(r->log_level, r->log, 0, | |
| 859 "DNS error (%d: %s), query id:%d", | |
| 860 code, ngx_resolver_strerror(code), ident); | |
| 861 return; | |
| 862 } | |
| 863 | |
| 864 if (nqs != 1) { | |
| 865 err = "invalid number of questions in DNS response"; | |
| 866 goto done; | |
| 867 } | |
| 868 | |
| 869 i = sizeof(ngx_resolver_query_t); | |
| 870 | |
| 871 while (i < (ngx_uint_t) n) { | |
| 872 if (buf[i] == '\0') { | |
| 873 goto found; | |
| 874 } | |
| 875 | |
| 876 len = buf[i]; | |
| 877 i += 1 + len; | |
| 878 } | |
| 879 | |
| 880 goto short_response; | |
| 881 | |
| 882 found: | |
| 883 | |
| 884 if (i++ == 0) { | |
| 885 err = "zero-length domain name in DNS response"; | |
| 886 goto done; | |
| 887 } | |
| 888 | |
| 889 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t)) | |
| 890 > (ngx_uint_t) n) | |
| 891 { | |
| 892 goto short_response; | |
| 893 } | |
| 894 | |
| 895 qs = (ngx_resolver_qs_t *) &buf[i]; | |
| 896 | |
| 897 qtype = (qs->type_hi << 8) + qs->type_lo; | |
| 898 qclass = (qs->class_hi << 8) + qs->class_lo; | |
| 899 | |
| 900 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 901 "resolver DNS response qt:%d cl:%d", qtype, qclass); | |
| 902 | |
| 903 if (qclass != 1) { | |
| 904 ngx_log_error(r->log_level, r->log, 0, | |
| 905 "unknown query class %d in DNS response", qclass); | |
| 906 return; | |
| 907 } | |
| 908 | |
| 909 switch (qtype) { | |
| 910 | |
| 911 case NGX_RESOLVE_A: | |
| 912 | |
| 913 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
|
914 i + sizeof(ngx_resolver_qs_t)); |
| 1649 | 915 |
| 916 break; | |
| 917 | |
| 918 case NGX_RESOLVE_PTR: | |
| 919 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
920 ngx_resolver_process_ptr(r, buf, n, ident, code, nan); |
| 1649 | 921 |
| 922 break; | |
| 923 | |
| 924 default: | |
| 925 ngx_log_error(r->log_level, r->log, 0, | |
| 926 "unknown query type %d in DNS response", qtype); | |
| 927 return; | |
| 928 } | |
| 929 | |
| 930 return; | |
| 931 | |
| 932 short_response: | |
| 933 | |
| 934 err = "short dns response"; | |
| 935 | |
| 936 done: | |
| 937 | |
| 938 ngx_log_error(r->log_level, r->log, 0, err); | |
| 939 | |
| 940 return; | |
| 941 } | |
| 942 | |
| 943 | |
| 944 static void | |
| 945 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last, | |
| 946 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans) | |
| 583 | 947 { |
| 1649 | 948 char *err; |
| 949 u_char *cname; | |
| 950 size_t len; | |
| 951 uint32_t hash; | |
| 952 in_addr_t addr, *addrs; | |
| 953 ngx_str_t name; | |
| 954 ngx_uint_t qtype, qident, naddrs, a, i, n, start; | |
| 955 ngx_resolver_an_t *an; | |
| 956 ngx_resolver_ctx_t *ctx, *next; | |
| 957 ngx_resolver_node_t *rn; | |
| 958 | |
| 959 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) { | |
| 960 return; | |
| 961 } | |
| 962 | |
| 963 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); | |
| 964 | |
| 965 hash = ngx_crc32_short(name.data, name.len); | |
| 966 | |
| 967 /* lock name mutex */ | |
| 968 | |
| 969 rn = ngx_resolver_lookup_name(r, &name, hash); | |
| 970 | |
| 971 if (rn == NULL || rn->query == NULL) { | |
| 972 ngx_log_error(r->log_level, r->log, 0, | |
| 973 "unexpected response for %V", &name); | |
| 974 goto failed; | |
| 975 } | |
| 976 | |
| 977 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 978 | |
| 979 if (ident != qident) { | |
| 980 ngx_log_error(r->log_level, r->log, 0, | |
| 981 "wrong ident %d response for %V, expect %d", | |
| 982 ident, &name, qident); | |
| 983 goto failed; | |
| 984 } | |
| 985 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
986 if (code == 0 && nan == 0) { |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
987 code = 3; /* NXDOMAIN */ |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
988 } |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
989 |
| 1649 | 990 if (code) { |
| 991 next = rn->waiting; | |
| 992 rn->waiting = NULL; | |
| 993 | |
| 994 ngx_queue_remove(&rn->queue); | |
| 995 | |
| 996 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 997 | |
| 998 ngx_resolver_free_node(r, rn); | |
| 999 | |
| 1000 /* unlock name mutex */ | |
| 1001 | |
| 1002 while (next) { | |
| 1003 ctx = next; | |
| 1004 ctx->state = code; | |
| 1005 next = ctx->next; | |
| 1006 | |
| 1007 ctx->handler(ctx); | |
| 1008 } | |
| 1009 | |
| 1010 return; | |
| 1011 } | |
| 1012 | |
| 1013 i = ans; | |
| 1014 naddrs = 0; | |
| 1015 addr = 0; | |
| 1016 addrs = NULL; | |
| 1017 cname = NULL; | |
| 1018 qtype = 0; | |
| 1019 | |
| 1020 for (a = 0; a < nan; a++) { | |
| 1021 | |
| 1022 start = i; | |
| 1023 | |
| 1024 while (i < last) { | |
| 1025 | |
| 1026 if (buf[i] & 0xc0) { | |
| 1027 i += 2; | |
| 1028 goto found; | |
| 1029 } | |
| 1030 | |
| 1031 if (buf[i] == 0) { | |
| 1032 i++; | |
| 1033 goto test_length; | |
| 1034 } | |
| 1035 | |
| 1036 i += 1 + buf[i]; | |
| 1037 } | |
| 1038 | |
| 1039 goto short_response; | |
| 1040 | |
| 1041 test_length: | |
| 1042 | |
| 1043 if (i - start < 2) { | |
| 1044 err = "invalid name in dns response"; | |
| 1045 goto invalid; | |
| 1046 } | |
| 1047 | |
| 1048 found: | |
| 1049 | |
| 1050 if (i + sizeof(ngx_resolver_an_t) >= last) { | |
| 1051 goto short_response; | |
| 1052 } | |
| 1053 | |
| 1054 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1055 | |
| 1056 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1057 len = (an->len_hi << 8) + an->len_lo; | |
| 1058 | |
| 1059 if (qtype == NGX_RESOLVE_A) { | |
| 1060 | |
| 1061 i += sizeof(ngx_resolver_an_t); | |
| 1062 | |
| 1063 if (i + len > last) { | |
| 1064 goto short_response; | |
| 1065 } | |
| 1066 | |
| 1067 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1068 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1069 | |
| 1070 naddrs++; | |
| 1071 | |
| 1072 i += len; | |
| 1073 | |
| 1074 } else if (qtype == NGX_RESOLVE_CNAME) { | |
| 1075 cname = &buf[i] + sizeof(ngx_resolver_an_t); | |
| 1076 i += sizeof(ngx_resolver_an_t) + len; | |
| 1077 } | |
| 1078 } | |
| 1079 | |
| 1080 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1081 "resolver naddrs:%ui cname:%p", naddrs, cname); | |
| 1082 | |
| 1083 if (naddrs) { | |
| 1084 | |
| 1085 if (naddrs == 1) { | |
| 1086 rn->u.addr = addr; | |
| 1087 | |
| 1088 } else { | |
| 1089 | |
| 1090 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t)); | |
| 1091 if (addrs == NULL) { | |
| 1092 return; | |
| 1093 } | |
| 1094 | |
| 1095 n = 0; | |
| 1096 i = ans; | |
| 1097 | |
| 1098 for (a = 0; a < nan; a++) { | |
| 1099 | |
| 1100 for ( ;; ) { | |
| 1101 | |
| 1102 if (buf[i] & 0xc0) { | |
| 1103 i += 2; | |
| 1104 goto ok; | |
| 1105 } | |
| 1106 | |
| 1107 if (buf[i] == 0) { | |
| 1108 i++; | |
| 1109 goto ok; | |
| 1110 } | |
| 1111 | |
| 1112 i += 1 + buf[i]; | |
| 1113 } | |
| 1114 | |
| 1115 ok: | |
| 1116 | |
| 1117 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1118 | |
| 1119 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1120 len = (an->len_hi << 8) + an->len_lo; | |
| 1121 | |
| 1122 i += sizeof(ngx_resolver_an_t); | |
| 1123 | |
| 1124 if (qtype == NGX_RESOLVE_A) { | |
| 1125 | |
| 1126 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1127 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1128 | |
| 1129 if (n == naddrs) { | |
| 1130 break; | |
| 1131 } | |
| 1132 } | |
| 1133 | |
| 1134 i += len; | |
| 1135 } | |
| 1136 | |
| 1137 rn->u.addrs = addrs; | |
| 1138 | |
| 1139 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
| 1140 naddrs * sizeof(in_addr_t)); | |
| 1141 if (addrs == NULL) { | |
| 1142 return; | |
| 1143 } | |
| 1144 } | |
| 1145 | |
| 1146 rn->naddrs = (u_short) naddrs; | |
| 1147 | |
| 1148 ngx_queue_remove(&rn->queue); | |
| 1149 | |
| 1150 rn->valid = ngx_time() + r->valid; | |
| 1151 rn->expire = ngx_time() + r->expire; | |
| 1152 | |
| 1153 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1154 | |
| 1155 next = rn->waiting; | |
| 1156 rn->waiting = NULL; | |
| 1157 | |
| 1158 /* unlock name mutex */ | |
| 1159 | |
| 1160 while (next) { | |
| 1161 ctx = next; | |
| 1162 ctx->state = NGX_OK; | |
| 1163 ctx->naddrs = naddrs; | |
| 1164 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 1165 ctx->addr = addr; | |
| 1166 next = ctx->next; | |
| 1167 | |
| 1168 ctx->handler(ctx); | |
| 1169 } | |
| 1170 | |
| 1171 if (naddrs) { | |
| 1172 ngx_resolver_free(r, addrs); | |
| 1173 } | |
| 1174 | |
| 1175 return; | |
| 1176 | |
| 1177 } else if (cname) { | |
| 1178 | |
| 1179 /* CNAME only */ | |
| 1180 | |
| 1181 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) { | |
| 1182 return; | |
| 1183 } | |
| 1184 | |
| 1185 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1186 "resolver cname:\"%V\"", &name); | |
| 1187 | |
|
1741
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1188 ngx_queue_remove(&rn->queue); |
|
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1189 |
| 1649 | 1190 rn->cnlen = (u_short) name.len; |
| 1191 rn->u.cname = name.data; | |
| 1192 rn->valid = ngx_time() + r->valid; | |
| 1193 rn->expire = ngx_time() + r->expire; | |
| 1194 | |
| 1195 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1196 | |
| 1197 ctx = rn->waiting; | |
| 1198 rn->waiting = NULL; | |
| 1199 | |
| 1200 if (ctx) { | |
| 1201 ctx->name = name; | |
| 1202 | |
| 1203 (void) ngx_resolve_name_locked(r, ctx); | |
| 1204 } | |
| 1205 | |
| 1206 return; | |
| 1207 } | |
| 1208 | |
| 1209 ngx_log_error(r->log_level, r->log, 0, | |
| 1210 "no A or CNAME types in DNS responses, unknown query type: %d", | |
| 1211 qtype); | |
| 1212 return; | |
| 1213 | |
| 1214 short_response: | |
| 1215 | |
| 1216 err = "short dns response"; | |
| 1217 | |
| 1218 invalid: | |
| 1219 | |
| 1220 /* unlock name mutex */ | |
| 1221 | |
| 1222 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1223 | |
| 1224 return; | |
| 1225 | |
| 1226 failed: | |
| 1227 | |
| 1228 /* unlock name mutex */ | |
| 1229 | |
| 1230 return; | |
| 1231 } | |
| 1232 | |
| 1233 | |
| 1234 static void | |
| 1235 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
|
1236 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan) |
| 1649 | 1237 { |
| 1238 char *err; | |
| 1239 size_t len; | |
| 1240 in_addr_t addr; | |
| 1241 ngx_int_t digit; | |
| 1242 ngx_str_t name; | |
| 1243 ngx_uint_t i, mask, qtype, qclass, qident; | |
| 1244 ngx_resolver_an_t *an; | |
| 1245 ngx_resolver_ctx_t *ctx, *next; | |
| 1246 ngx_resolver_node_t *rn; | |
| 1247 | |
| 1248 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) { | |
| 1249 goto invalid_in_addr_arpa; | |
| 1250 } | |
| 1251 | |
| 1252 addr = 0; | |
| 1253 i = 12; | |
| 1254 | |
| 1255 for (mask = 0; mask < 32; mask += 8) { | |
| 1256 len = buf[i++]; | |
| 1257 | |
| 1258 digit = ngx_atoi(&buf[i], len); | |
| 1259 if (digit == NGX_ERROR || digit > 255) { | |
| 1260 goto invalid_in_addr_arpa; | |
| 1261 } | |
| 1262 | |
| 1263 addr += digit << mask; | |
| 1264 i += len; | |
| 1265 } | |
| 1266 | |
| 1267 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) { | |
| 1268 goto invalid_in_addr_arpa; | |
| 1269 } | |
| 1270 | |
| 1271 /* lock addr mutex */ | |
| 1272 | |
| 1273 rn = ngx_resolver_lookup_addr(r, addr); | |
| 1274 | |
| 1275 if (rn == NULL || rn->query == NULL) { | |
| 1276 ngx_log_error(r->log_level, r->log, 0, | |
| 1277 "unexpected response for %ud.%ud.%ud.%ud", | |
| 1278 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 1279 (addr >> 8) & 0xff, addr & 0xff); | |
| 1280 goto failed; | |
| 1281 } | |
| 1282 | |
| 1283 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 1284 | |
| 1285 if (ident != qident) { | |
| 1286 ngx_log_error(r->log_level, r->log, 0, | |
| 1287 "wrong ident %d response for %ud.%ud.%ud.%ud, expect %d", | |
| 1288 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 1289 (addr >> 8) & 0xff, addr & 0xff, qident); | |
| 1290 goto failed; | |
| 1291 } | |
| 1292 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1293 if (code == 0 && nan == 0) { |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1294 code = 3; /* NXDOMAIN */ |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1295 } |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1296 |
| 1649 | 1297 if (code) { |
| 1298 next = rn->waiting; | |
| 1299 rn->waiting = NULL; | |
| 1300 | |
| 1301 ngx_queue_remove(&rn->queue); | |
| 1302 | |
| 1303 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 1304 | |
| 1305 ngx_resolver_free_node(r, rn); | |
| 1306 | |
| 1307 /* unlock addr mutex */ | |
| 1308 | |
| 1309 while (next) { | |
| 1310 ctx = next; | |
| 1311 ctx->state = code; | |
| 1312 next = ctx->next; | |
| 1313 | |
| 1314 ctx->handler(ctx); | |
| 1315 } | |
| 1316 | |
| 1317 return; | |
| 1318 } | |
| 1319 | |
| 1320 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t); | |
| 1321 | |
| 1322 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) { | |
| 1323 goto short_response; | |
| 1324 } | |
| 1325 | |
| 1326 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */ | |
| 1327 | |
| 1328 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) { | |
| 1329 err = "invalid in-addr.arpa name in DNS response"; | |
| 1330 goto invalid; | |
| 1331 } | |
| 1332 | |
| 1333 an = (ngx_resolver_an_t *) &buf[i + 2]; | |
| 1334 | |
| 1335 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1336 qclass = (an->class_hi << 8) + an->class_lo; | |
| 1337 len = (an->len_hi << 8) + an->len_lo; | |
| 1338 | |
| 1339 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1340 "resolver qt:%d cl:%d len:%uz", qtype, qclass, len); | |
| 1341 | |
| 1342 i += 2 + sizeof(ngx_resolver_an_t); | |
| 1343 | |
| 1344 if (i + len > (ngx_uint_t) n) { | |
| 1345 goto short_response; | |
| 1346 } | |
| 1347 | |
| 1348 len -= 2; | |
| 1349 | |
| 1350 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) { | |
| 1351 return; | |
| 1352 } | |
| 1353 | |
| 1354 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name); | |
| 1355 | |
| 1356 if (len != (size_t) rn->nlen || ngx_strncmp(name.data, rn->name, len) != 0) | |
| 1357 { | |
| 1358 ngx_resolver_free(r, rn->name); | |
| 1359 rn->name = name.data; | |
| 1360 | |
| 1361 name.data = ngx_resolver_dup(r, rn->name, len); | |
| 1362 if (name.data == NULL) { | |
| 1363 goto failed; | |
| 1364 } | |
| 1365 } | |
| 1366 | |
| 1367 ngx_queue_remove(&rn->queue); | |
| 1368 | |
| 1369 rn->valid = ngx_time() + r->valid; | |
| 1370 rn->expire = ngx_time() + r->expire; | |
| 1371 | |
| 1372 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
| 1373 | |
| 1374 next = rn->waiting; | |
| 1375 rn->waiting = NULL; | |
| 1376 | |
| 1377 /* unlock addr mutex */ | |
| 1378 | |
| 1379 while (next) { | |
| 1380 ctx = next; | |
| 1381 ctx->state = NGX_OK; | |
| 1382 ctx->name = name; | |
| 1383 next = ctx->next; | |
| 1384 | |
| 1385 ctx->handler(ctx); | |
| 1386 } | |
| 1387 | |
| 1388 ngx_resolver_free(r, name.data); | |
| 1389 | |
| 1390 return; | |
| 1391 | |
| 1392 invalid_in_addr_arpa: | |
| 1393 | |
| 1394 ngx_log_error(r->log_level, r->log, 0, | |
| 1395 "invalid in-addr.arpa name in DNS response"); | |
| 1396 return; | |
| 1397 | |
| 1398 short_response: | |
| 1399 | |
| 1400 err = "short DNS response"; | |
| 1401 | |
| 1402 invalid: | |
| 1403 | |
| 1404 /* unlock addr mutex */ | |
| 1405 | |
| 1406 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1407 | |
| 1408 return; | |
| 1409 | |
| 1410 failed: | |
| 1411 | |
| 1412 /* unlock addr mutex */ | |
| 1413 | |
| 1414 return; | |
| 1415 } | |
| 1416 | |
| 1417 | |
| 1418 static ngx_resolver_node_t * | |
| 1419 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) | |
| 1420 { | |
| 1421 ngx_int_t rc; | |
| 1422 size_t len; | |
| 1423 ngx_rbtree_node_t *node, *sentinel; | |
| 1424 ngx_resolver_node_t *rn; | |
| 1425 | |
| 1426 node = r->name_rbtree.root; | |
| 1427 sentinel = r->name_rbtree.sentinel; | |
| 1428 | |
| 1429 while (node != sentinel) { | |
| 1430 | |
| 1431 if (hash < node->key) { | |
| 1432 node = node->left; | |
| 1433 continue; | |
| 1434 } | |
| 1435 | |
| 1436 if (hash > node->key) { | |
| 1437 node = node->right; | |
| 1438 continue; | |
| 1439 } | |
| 1440 | |
| 1441 /* hash == node->key */ | |
| 1442 | |
| 1443 do { | |
| 1444 rn = (ngx_resolver_node_t *) node; | |
| 1445 | |
| 1446 len = (name->len > (size_t) rn->nlen) ? rn->nlen : name->len; | |
| 1447 | |
| 1448 rc = ngx_strncmp(name->data, rn->name, len); | |
| 1449 | |
| 1450 if (rc == 0) { | |
| 1451 return rn; | |
| 1452 } | |
| 1453 | |
| 1454 node = (rc < 0) ? node->left : node->right; | |
| 1455 | |
| 1456 } while (node != sentinel && hash == node->key); | |
| 1457 | |
| 1458 break; | |
| 1459 } | |
| 1460 | |
| 1461 /* not found */ | |
| 1462 | |
| 1463 return NULL; | |
| 1464 } | |
| 1465 | |
| 1466 | |
| 1467 static ngx_resolver_node_t * | |
| 1468 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr) | |
| 1469 { | |
| 1470 ngx_rbtree_node_t *node, *sentinel; | |
| 1471 | |
| 1472 node = r->addr_rbtree.root; | |
| 1473 sentinel = r->addr_rbtree.sentinel; | |
| 1474 | |
| 1475 while (node != sentinel) { | |
| 1476 | |
| 1477 if (addr < node->key) { | |
| 1478 node = node->left; | |
| 1479 continue; | |
| 1480 } | |
| 1481 | |
| 1482 if (addr > node->key) { | |
| 1483 node = node->right; | |
| 1484 continue; | |
| 1485 } | |
| 1486 | |
| 1487 /* addr == node->key */ | |
| 1488 | |
| 1489 return (ngx_resolver_node_t *) node; | |
| 1490 } | |
| 1491 | |
| 1492 /* not found */ | |
| 1493 | |
| 1494 return NULL; | |
| 1495 } | |
| 1496 | |
| 1497 | |
| 1498 static void | |
| 1499 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
| 1500 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
| 1501 { | |
| 1502 size_t len; | |
| 1503 ngx_rbtree_node_t **p; | |
| 1504 ngx_resolver_node_t *rn, *rn_temp; | |
| 1505 | |
| 1506 for ( ;; ) { | |
| 1507 | |
| 1508 if (node->key < temp->key) { | |
| 1509 | |
| 1510 p = &temp->left; | |
| 1511 | |
| 1512 } else if (node->key > temp->key) { | |
| 1513 | |
| 1514 p = &temp->right; | |
| 1515 | |
| 1516 } else { /* node->key == temp->key */ | |
| 1517 | |
| 1518 rn = (ngx_resolver_node_t *) node; | |
| 1519 rn_temp = (ngx_resolver_node_t *) temp; | |
| 1520 | |
| 1521 len = (rn->nlen > rn_temp->nlen) ? rn_temp->nlen : rn->nlen; | |
| 1522 | |
| 1523 p = (ngx_strncmp(rn->name, rn_temp->name, len) < 0) | |
| 1524 ? &temp->left : &temp->right; | |
| 1525 } | |
| 1526 | |
| 1527 if (*p == sentinel) { | |
| 1528 break; | |
| 1529 } | |
| 1530 | |
| 1531 temp = *p; | |
| 1532 } | |
| 1533 | |
| 1534 *p = node; | |
| 1535 node->parent = temp; | |
| 1536 node->left = sentinel; | |
| 1537 node->right = sentinel; | |
| 1538 ngx_rbt_red(node); | |
| 1539 } | |
| 1540 | |
| 1541 | |
| 1542 static ngx_int_t | |
| 1543 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1544 { | |
| 1545 u_char *p, *s; | |
| 1546 size_t len; | |
| 1547 ngx_uint_t ident; | |
| 1548 ngx_resolver_qs_t *qs; | |
| 1549 ngx_resolver_query_t *query; | |
| 1550 | |
| 1551 len = sizeof(ngx_resolver_query_t) | |
| 1552 + 1 + ctx->name.len + 1 + sizeof(ngx_resolver_qs_t); | |
| 1553 | |
| 1554 p = ngx_resolver_calloc(ctx->resolver, len); | |
| 1555 if (p == NULL) { | |
| 1556 return NGX_ERROR; | |
| 1557 } | |
| 1558 | |
| 1559 rn->qlen = (u_short) len; | |
| 1560 rn->query = p; | |
| 1561 | |
| 1562 query = (ngx_resolver_query_t *) p; | |
| 1563 | |
| 1564 ident = ngx_random(); | |
| 1565 | |
| 1566 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0, | |
| 1567 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff); | |
| 1568 | |
| 1569 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1570 query->ident_lo = (u_char) (ident & 0xff); | |
| 1571 | |
| 1572 /* recursion query */ | |
| 1573 query->flags_hi = 1; query->flags_lo = 0; | |
| 1574 | |
| 1575 /* one question */ | |
| 1576 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1577 query->nan_hi = 0; query->nan_lo = 0; | |
| 1578 query->nns_hi = 0; query->nns_lo = 0; | |
| 1579 query->nar_hi = 0; query->nar_lo = 0; | |
| 1580 | |
| 1581 p += sizeof(ngx_resolver_query_t) + 1 + ctx->name.len + 1; | |
| 1582 | |
| 1583 qs = (ngx_resolver_qs_t *) p; | |
| 1584 | |
| 1585 /* query type */ | |
| 1586 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type; | |
| 1587 | |
| 1588 /* IP query class */ | |
| 1589 qs->class_hi = 0; qs->class_lo = 1; | |
| 1590 | |
| 1591 /* convert "www.example.com" to "\3www\7example\3com\0" */ | |
| 1592 | |
| 1593 len = 0; | |
| 1594 p--; | |
| 1595 *p-- = '\0'; | |
| 1596 | |
| 1597 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) { | |
| 1598 if (*s != '.') { | |
| 1599 *p = *s; | |
| 1600 len++; | |
| 1601 | |
| 1602 } else { | |
| 1603 *p = (u_char) len; | |
| 1604 len = 0; | |
| 1605 } | |
| 1606 | |
| 1607 p--; | |
| 1608 } | |
| 1609 | |
| 1610 *p = (u_char) len; | |
| 1611 | |
| 1612 return NGX_OK; | |
| 1613 } | |
| 1614 | |
| 1615 | |
| 1616 /* AF_INET only */ | |
| 1617 | |
| 1618 static ngx_int_t | |
| 1619 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1620 { | |
| 1621 u_char *p, *d; | |
| 1622 size_t len; | |
| 1623 ngx_int_t n; | |
| 1624 ngx_uint_t ident; | |
| 1625 ngx_resolver_query_t *query; | |
| 1626 | |
| 1627 len = sizeof(ngx_resolver_query_t) | |
| 1628 + sizeof(".255.255.255.255.in-addr.arpa.") - 1 | |
| 1629 + sizeof(ngx_resolver_qs_t); | |
| 1630 | |
| 1631 p = ngx_resolver_calloc(ctx->resolver, len); | |
| 1632 if (p == NULL) { | |
| 1633 return NGX_ERROR; | |
| 1634 } | |
| 1635 | |
| 1636 rn->query = p; | |
| 1637 query = (ngx_resolver_query_t *) p; | |
| 1638 | |
| 1639 ident = ngx_random(); | |
| 1640 | |
| 1641 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1642 query->ident_lo = (u_char) (ident & 0xff); | |
| 1643 | |
| 1644 /* recursion query */ | |
| 1645 query->flags_hi = 1; query->flags_lo = 0; | |
| 1646 | |
| 1647 /* one question */ | |
| 1648 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1649 query->nan_hi = 0; query->nan_lo = 0; | |
| 1650 query->nns_hi = 0; query->nns_lo = 0; | |
| 1651 query->nar_hi = 0; query->nar_lo = 0; | |
| 1652 | |
| 1653 p += sizeof(ngx_resolver_query_t); | |
| 1654 | |
| 1655 for (n = 0; n < 32; n += 8){ | |
| 1656 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff); | |
| 1657 *p = (u_char) (d - &p[1]); | |
| 1658 p = d; | |
| 1659 } | |
| 1660 | |
| 1661 /* query type "PTR", IP query class */ | |
| 1662 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18); | |
| 1663 | |
| 1664 rn->qlen = (u_short) | |
| 1665 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t) | |
| 1666 - rn->query); | |
| 1667 | |
| 1668 return NGX_OK; | |
| 1669 } | |
| 1670 | |
| 1671 | |
| 1672 static ngx_int_t | |
| 1673 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src, | |
| 1674 u_char *last) | |
| 1675 { | |
| 1676 char *err; | |
| 1677 u_char *p, *dst; | |
| 1678 ssize_t len; | |
| 1679 ngx_uint_t i, n; | |
| 1680 | |
| 1681 p = src; | |
| 1682 len = -1; | |
| 1683 | |
| 1684 /* | |
| 1685 * compression pointers allow to create endless loop, so we set limit; | |
| 1686 * 128 pointers should be enough to store 255-byte name | |
| 1687 */ | |
| 1688 | |
| 1689 for (i = 0; i < 128; i++) { | |
| 1690 n = *p++; | |
| 1691 | |
| 1692 if (n == 0) { | |
| 1693 goto done; | |
| 1694 } | |
| 1695 | |
| 1696 if (n & 0xc0) { | |
| 1697 n = (n & 0x3f << 8) + *p; | |
| 1698 p = &buf[n]; | |
| 1699 | |
| 1700 } else { | |
| 1701 len += 1 + n; | |
| 1702 p = &p[n]; | |
| 1703 } | |
| 1704 | |
| 1705 if (p >= last) { | |
| 1706 err = "name is out of response"; | |
| 1707 goto invalid; | |
| 1708 } | |
| 1709 } | |
| 1710 | |
| 1711 err = "compression pointers loop"; | |
| 1712 | |
| 1713 invalid: | |
| 1714 | |
| 1715 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1716 | |
| 1717 return NGX_ERROR; | |
| 1718 | |
| 1719 done: | |
| 1720 | |
| 1721 if (name == NULL) { | |
| 583 | 1722 return NGX_OK; |
| 1723 } | |
| 1724 | |
| 1649 | 1725 dst = ngx_resolver_alloc(r, len); |
| 1726 if (dst == NULL) { | |
| 1727 return NGX_ERROR; | |
| 1728 } | |
| 1729 | |
| 1730 name->data = dst; | |
| 1731 | |
| 1732 n = *src++; | |
| 1733 | |
| 1734 for ( ;; ) { | |
| 1735 if (n != 0xc0) { | |
| 1736 ngx_memcpy(dst, src, n); | |
| 1737 dst += n; | |
| 1738 src += n; | |
| 1739 | |
| 1740 n = *src++; | |
| 1741 | |
| 1742 if (n != 0) { | |
| 1743 *dst++ = '.'; | |
| 1744 } | |
| 1745 | |
| 1746 } else { | |
| 1747 n = (n & 0x3f << 8) + *src; | |
| 1748 src = &buf[n]; | |
| 1749 | |
| 1750 n = *src++; | |
| 1751 } | |
| 1752 | |
| 1753 if (n == 0) { | |
| 1754 name->len = dst - name->data; | |
| 1755 return NGX_OK; | |
| 1756 } | |
| 1757 } | |
| 1758 } | |
| 1759 | |
| 1760 | |
| 1761 static void | |
| 1762 ngx_resolver_timeout_handler(ngx_event_t *ev) | |
| 1763 { | |
| 1764 ngx_resolver_ctx_t *ctx; | |
| 1765 | |
| 1766 ctx = ev->data; | |
| 1767 | |
| 1768 ctx->state = NGX_RESOLVE_TIMEDOUT; | |
| 1769 | |
| 1770 ctx->handler(ctx); | |
| 1771 } | |
| 1772 | |
| 1773 | |
| 1774 static void | |
| 1775 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 1776 { | |
| 1777 /* lock alloc mutex */ | |
| 1778 | |
| 1779 if (rn->query) { | |
| 1780 ngx_resolver_free_locked(r, rn->query); | |
| 1781 } | |
| 1782 | |
| 1783 if (rn->name) { | |
| 1784 ngx_resolver_free_locked(r, rn->name); | |
| 1785 } | |
| 1786 | |
| 1787 if (rn->cnlen) { | |
| 1788 ngx_resolver_free_locked(r, rn->u.cname); | |
| 1789 } | |
| 1790 | |
| 1791 if (rn->naddrs > 1) { | |
| 1792 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 1793 } | |
| 1794 | |
| 1795 ngx_resolver_free_locked(r, rn); | |
| 1796 | |
| 1797 /* unlock alloc mutex */ | |
| 1798 } | |
| 1799 | |
| 1800 | |
| 1801 static void * | |
| 1802 ngx_resolver_alloc(ngx_resolver_t *r, size_t size) | |
| 1803 { | |
| 1804 u_char *p; | |
| 1805 | |
| 1806 /* lock alloc mutex */ | |
| 1807 | |
| 1808 p = ngx_alloc(size, r->log); | |
| 1809 | |
| 1810 /* unlock alloc mutex */ | |
| 1811 | |
| 1812 return p; | |
| 1813 } | |
| 1814 | |
| 1815 | |
| 1816 void * | |
| 1817 ngx_resolver_calloc(ngx_resolver_t *r, size_t size) | |
| 1818 { | |
| 1819 u_char *p; | |
| 1820 | |
| 1821 p = ngx_resolver_alloc(r, size); | |
| 1822 | |
| 1823 if (p) { | |
| 1824 ngx_memzero(p, size); | |
| 1825 } | |
| 1826 | |
| 1827 return p; | |
| 1828 } | |
| 1829 | |
| 1830 | |
| 1831 static void | |
| 1832 ngx_resolver_free(ngx_resolver_t *r, void *p) | |
| 1833 { | |
| 1834 /* lock alloc mutex */ | |
| 1835 | |
| 1836 ngx_free(p); | |
| 1837 | |
| 1838 /* unlock alloc mutex */ | |
| 1839 } | |
| 1840 | |
| 1841 | |
| 1842 static void | |
| 1843 ngx_resolver_free_locked(ngx_resolver_t *r, void *p) | |
| 1844 { | |
| 1845 ngx_free(p); | |
| 1846 } | |
| 1847 | |
| 1848 | |
| 1849 static void * | |
| 1850 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size) | |
| 1851 { | |
| 1852 void *dst; | |
| 1853 | |
| 1854 dst = ngx_resolver_alloc(r, size); | |
| 1855 | |
| 1856 if (dst == NULL) { | |
| 1857 return dst; | |
| 1858 } | |
| 1859 | |
| 1860 ngx_memcpy(dst, src, size); | |
| 1861 | |
| 1862 return dst; | |
| 1863 } | |
| 1864 | |
| 1865 | |
| 1866 char * | |
| 1867 ngx_resolver_strerror(ngx_int_t err) | |
| 1868 { | |
| 1869 static char *errors[] = { | |
| 1870 "Format error", /* FORMERR */ | |
| 1871 "Server failure", /* SERVFAIL */ | |
| 1872 "Host not found", /* NXDOMAIN */ | |
| 1873 "Unimplemented", /* NOTIMP */ | |
| 1874 "Operation refused" /* REFUSED */ | |
| 1875 }; | |
| 1876 | |
| 1877 if (err > 0 && err < 6) { | |
| 1878 return errors[err - 1]; | |
| 1879 } | |
| 1880 | |
| 1881 if (err == NGX_RESOLVE_TIMEDOUT) { | |
| 1882 return "Operation timed out"; | |
| 1883 } | |
| 1884 | |
| 1885 return "Unknown error"; | |
| 1886 } | |
| 1887 | |
| 1888 | |
| 1889 ngx_int_t | |
| 1890 ngx_udp_connect(ngx_udp_connection_t *uc) | |
| 1891 { | |
| 1892 int rc; | |
| 1893 ngx_int_t event; | |
| 1894 ngx_event_t *rev, *wev; | |
| 1895 ngx_socket_t s; | |
| 1896 ngx_connection_t *c; | |
| 1897 | |
| 583 | 1898 s = ngx_socket(AF_INET, SOCK_DGRAM, 0); |
| 1899 | |
| 1649 | 1900 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, uc->log, 0, "UDP socket %d", s); |
| 583 | 1901 |
| 1902 if (s == -1) { | |
| 1649 | 1903 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
| 583 | 1904 ngx_socket_n " failed"); |
| 1905 return NGX_ERROR; | |
| 1906 } | |
| 1907 | |
| 1649 | 1908 c = ngx_get_connection(s, uc->log); |
| 583 | 1909 |
| 1910 if (c == NULL) { | |
| 1911 if (ngx_close_socket(s) == -1) { | |
| 1649 | 1912 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
| 583 | 1913 ngx_close_socket_n "failed"); |
| 1914 } | |
| 1915 | |
| 1916 return NGX_ERROR; | |
| 1917 } | |
| 1918 | |
| 1649 | 1919 if (ngx_nonblocking(s) == -1) { |
| 1920 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
| 1921 ngx_nonblocking_n " failed"); | |
| 1922 | |
| 1923 ngx_free_connection(c); | |
| 1924 | |
| 1925 if (ngx_close_socket(s) == -1) { | |
| 1926 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
| 1927 ngx_close_socket_n " failed"); | |
| 1928 } | |
| 1929 | |
| 1930 return NGX_ERROR; | |
| 1931 } | |
| 1932 | |
| 583 | 1933 rev = c->read; |
| 1934 wev = c->write; | |
| 1935 | |
| 1649 | 1936 rev->log = uc->log; |
| 1937 wev->log = uc->log; | |
| 1938 | |
| 1939 uc->connection = c; | |
| 583 | 1940 |
| 1941 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); | |
| 1942 | |
| 1943 #if (NGX_THREADS) | |
| 1649 | 1944 |
| 1945 /* TODO: lock event when call completion handler */ | |
| 1946 | |
| 1947 rev->lock = &c->lock; | |
| 1948 wev->lock = &c->lock; | |
| 583 | 1949 rev->own_lock = &c->lock; |
| 1950 wev->own_lock = &c->lock; | |
| 1649 | 1951 |
| 583 | 1952 #endif |
| 1953 | |
| 1649 | 1954 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, uc->log, 0, |
| 1955 "connect to %V, fd:%d #%d", &uc->server, s, c->number); | |
| 1956 | |
| 1957 rc = connect(s, uc->sockaddr, uc->socklen); | |
| 1958 | |
| 1959 /* TODO: aio, iocp */ | |
| 583 | 1960 |
| 1961 if (rc == -1) { | |
| 1649 | 1962 ngx_log_error(NGX_LOG_CRIT, uc->log, ngx_socket_errno, |
| 1963 "connect() to %V failed", &uc->server); | |
| 583 | 1964 |
| 1965 return NGX_ERROR; | |
| 1966 } | |
| 1967 | |
| 1649 | 1968 /* UDP sockets are always ready to write */ |
| 1969 wev->ready = 1; | |
| 1970 | |
| 1971 if (ngx_add_event) { | |
| 1972 | |
| 1973 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ? | |
| 1974 /* kqueue, epoll */ NGX_CLEAR_EVENT: | |
| 1975 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT; | |
| 1976 /* eventport event type has no meaning: oneshot only */ | |
| 1977 | |
| 1978 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { | |
| 1979 return NGX_ERROR; | |
| 1980 } | |
| 1981 | |
| 1982 } else { | |
| 1983 /* rtsig */ | |
| 1984 | |
| 583 | 1985 if (ngx_add_conn(c) == NGX_ERROR) { |
| 1986 return NGX_ERROR; | |
| 1987 } | |
| 1988 } | |
| 1989 | |
| 1990 return NGX_OK; | |
| 1991 } |