Mercurial > hg > nginx
annotate src/core/ngx_resolver.c @ 1774:68d21fd1dc64
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| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Mon, 24 Dec 2007 17:05:31 +0000 |
| parents | 268b81386fe4 |
| children | 24f9901157ab |
| 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, |
|
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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 | |
|
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1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
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131 if (addr) { |
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1e0b028055ec
allow to use IP addresses without defined resolver
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parents:
1679
diff
changeset
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132 uc = ngx_calloc(sizeof(ngx_udp_connection_t), log); |
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allow to use IP addresses without defined resolver
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parents:
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diff
changeset
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133 if (uc == NULL) { |
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allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
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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); | |
| 218 } | |
| 219 | |
| 220 ngx_resolver_free_locked(r, ctx); | |
| 221 | |
| 222 /* unlock alloc mutex */ | |
| 223 | |
| 224 return NGX_ERROR; | |
| 225 } | |
| 226 | |
| 227 | |
| 228 void | |
| 229 ngx_resolve_name_done(ngx_resolver_ctx_t *ctx) | |
| 230 { | |
| 231 uint32_t hash; | |
| 232 ngx_resolver_t *r; | |
| 233 ngx_resolver_ctx_t *w, **p; | |
| 234 ngx_resolver_node_t *rn; | |
| 235 | |
| 236 r = ctx->resolver; | |
| 237 | |
| 238 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 239 "resolve name done: %i", ctx->state); | |
| 240 | |
| 241 if (ctx->quick) { | |
| 242 return; | |
| 243 } | |
| 244 | |
| 245 if (ctx->event && ctx->event->timer_set) { | |
| 246 ngx_del_timer(ctx->event); | |
| 247 } | |
| 248 | |
| 249 /* lock name mutex */ | |
| 250 | |
| 251 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
| 252 | |
| 253 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
| 254 | |
| 255 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
| 256 | |
| 257 if (rn) { | |
| 258 p = &rn->waiting; | |
| 259 w = rn->waiting; | |
| 260 | |
| 261 while (w) { | |
| 262 if (w == ctx) { | |
| 263 *p = w->next; | |
| 264 | |
| 265 goto done; | |
| 266 } | |
| 267 | |
| 268 p = &w->next; | |
| 269 w = w->next; | |
| 270 } | |
| 271 } | |
| 272 | |
| 273 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
| 274 "could not cancel %V resolving", &ctx->name); | |
| 275 } | |
| 276 | |
| 277 done: | |
| 278 | |
| 279 ngx_resolver_expire(r, &r->name_rbtree, &r->name_expire_queue); | |
| 280 | |
| 281 /* unlock name mutex */ | |
| 282 | |
| 283 ngx_resolver_free(r, ctx); | |
| 284 } | |
| 285 | |
| 286 | |
| 287 /* NGX_RESOLVE_A only */ | |
| 288 | |
| 289 static ngx_int_t | |
| 290 ngx_resolve_name_locked(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx) | |
| 291 { | |
| 292 uint32_t hash; | |
| 293 in_addr_t addr, *addrs; | |
| 294 ngx_uint_t naddrs; | |
| 295 ngx_resolver_ctx_t *next; | |
| 296 ngx_resolver_node_t *rn; | |
| 297 | |
| 298 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
| 299 | |
| 300 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
| 301 | |
| 302 if (rn) { | |
| 303 | |
| 304 if (rn->valid >= ngx_time()) { | |
| 305 | |
| 306 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
| 307 | |
| 308 ngx_queue_remove(&rn->queue); | |
| 309 | |
| 310 rn->expire = ngx_time() + r->expire; | |
| 311 | |
| 312 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 313 | |
| 314 naddrs = rn->naddrs; | |
| 315 | |
| 316 if (naddrs) { | |
| 317 | |
| 318 /* NGX_RESOLVE_A answer */ | |
| 319 | |
| 320 if (naddrs != 1) { | |
| 321 addr = 0; | |
| 322 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
| 323 naddrs * sizeof(in_addr_t)); | |
| 324 if (addrs == NULL) { | |
| 325 return NGX_ERROR; | |
| 326 } | |
| 327 | |
| 328 } else { | |
| 329 addr = rn->u.addr; | |
| 330 addrs = NULL; | |
| 331 } | |
| 332 | |
| 333 ctx->next = rn->waiting; | |
| 334 rn->waiting = NULL; | |
| 335 | |
| 336 /* unlock name mutex */ | |
| 337 | |
| 338 do { | |
| 339 ctx->state = NGX_OK; | |
| 340 ctx->naddrs = naddrs; | |
| 341 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 342 ctx->addr = addr; | |
| 343 next = ctx->next; | |
| 344 | |
| 345 ctx->handler(ctx); | |
| 346 | |
| 347 ctx = next; | |
| 348 } while (ctx); | |
| 349 | |
| 350 if (addrs) { | |
| 351 ngx_resolver_free(r, addrs); | |
| 352 } | |
| 353 | |
| 354 return NGX_OK; | |
| 355 } | |
| 356 | |
| 357 /* NGX_RESOLVE_CNAME */ | |
| 358 | |
| 359 ctx->name.len = rn->cnlen; | |
| 360 ctx->name.data = rn->u.cname; | |
| 361 | |
| 362 return ngx_resolve_name_locked(r, ctx); | |
| 363 } | |
| 364 | |
| 365 if (rn->waiting) { | |
| 366 | |
| 367 ctx->next = rn->waiting; | |
| 368 rn->waiting = ctx; | |
| 369 | |
| 370 return NGX_AGAIN; | |
| 371 } | |
| 372 | |
| 373 ngx_queue_remove(&rn->queue); | |
| 374 | |
| 375 /* lock alloc mutex */ | |
| 376 | |
| 377 ngx_resolver_free_locked(r, rn->query); | |
| 378 | |
| 379 if (rn->cnlen) { | |
| 380 ngx_resolver_free_locked(r, rn->u.cname); | |
| 381 } | |
| 382 | |
| 383 if (rn->naddrs > 1) { | |
| 384 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 385 } | |
| 386 | |
| 387 /* unlock alloc mutex */ | |
| 388 | |
| 389 } else { | |
| 390 | |
| 391 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
| 392 if (rn == NULL) { | |
| 393 return NGX_ERROR; | |
| 394 } | |
| 395 | |
| 396 rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len); | |
| 397 if (rn->name == NULL) { | |
| 398 ngx_resolver_free(r, rn); | |
| 399 return NGX_ERROR; | |
| 400 } | |
| 401 | |
| 402 rn->node.key = hash; | |
| 403 rn->nlen = (u_short) ctx->name.len; | |
| 404 | |
| 405 ngx_rbtree_insert(&r->name_rbtree, &rn->node); | |
| 406 } | |
| 407 | |
| 408 if (ngx_resolver_create_name_query(rn, ctx) != NGX_OK) { | |
| 409 goto failed; | |
| 410 } | |
| 411 | |
| 412 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
| 413 goto failed; | |
| 414 } | |
| 415 | |
| 416 if (ctx->event == NULL) { | |
| 417 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
| 418 if (ctx->event == NULL) { | |
| 419 goto failed; | |
| 420 } | |
| 421 | |
| 422 ctx->event->handler = ngx_resolver_timeout_handler; | |
| 423 ctx->event->data = ctx; | |
| 424 ctx->event->log = r->log; | |
| 425 ctx->ident = -1; | |
| 426 | |
| 427 ngx_add_timer(ctx->event, ctx->timeout); | |
| 428 } | |
| 429 | |
| 430 if (ngx_queue_empty(&r->name_resend_queue)) { | |
| 431 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
| 432 } | |
| 433 | |
| 434 rn->expire = ngx_time() + r->resend_timeout; | |
| 435 | |
| 436 ngx_queue_insert_head(&r->name_resend_queue, &rn->queue); | |
| 437 | |
| 438 rn->cnlen = 0; | |
| 439 rn->naddrs = 0; | |
| 440 rn->valid = 0; | |
| 441 rn->waiting = ctx; | |
| 442 | |
| 443 ctx->state = NGX_AGAIN; | |
| 444 | |
| 445 return NGX_AGAIN; | |
| 446 | |
| 447 failed: | |
| 448 | |
| 449 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 450 | |
| 451 ngx_resolver_free(r, rn->name); | |
| 452 | |
| 453 ngx_resolver_free(r, rn); | |
| 454 | |
| 455 return NGX_ERROR; | |
| 456 } | |
| 583 | 457 |
| 458 | |
| 459 ngx_int_t | |
| 1649 | 460 ngx_resolve_addr(ngx_resolver_ctx_t *ctx) |
| 461 { | |
| 462 ngx_resolver_t *r; | |
| 463 ngx_resolver_node_t *rn; | |
| 464 | |
| 465 r = ctx->resolver; | |
| 466 | |
| 467 ctx->addr = ntohl(ctx->addr); | |
| 468 | |
| 469 /* lock addr mutex */ | |
| 470 | |
| 471 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
| 472 | |
| 473 if (rn) { | |
| 474 | |
| 475 if (rn->valid >= ngx_time()) { | |
| 476 | |
| 477 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
| 478 | |
| 479 ngx_queue_remove(&rn->queue); | |
| 480 | |
| 481 rn->expire = ngx_time() + r->expire; | |
| 482 | |
| 483 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
| 484 | |
| 485 ctx->name.len = rn->nlen; | |
| 486 ctx->name.data = ngx_resolver_dup(r, rn->name, rn->nlen); | |
| 487 if (ctx->name.data == NULL) { | |
| 488 goto failed; | |
| 489 } | |
| 490 | |
| 491 /* unlock addr mutex */ | |
| 492 | |
| 493 ctx->state = NGX_OK; | |
| 494 | |
| 495 ctx->handler(ctx); | |
| 496 | |
| 497 ngx_resolver_free(r, ctx->name.data); | |
| 498 | |
| 499 return NGX_OK; | |
| 500 } | |
| 501 | |
| 502 if (rn->waiting) { | |
| 503 | |
| 504 ctx->next = rn->waiting; | |
| 505 rn->waiting = ctx; | |
| 506 | |
| 507 return NGX_AGAIN; | |
| 508 } | |
| 509 | |
| 510 ngx_queue_remove(&rn->queue); | |
| 511 | |
| 512 ngx_resolver_free(r, rn->query); | |
| 513 | |
| 514 } else { | |
| 515 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
| 516 if (rn == NULL) { | |
| 517 goto failed; | |
| 518 } | |
| 519 | |
| 520 rn->node.key = ctx->addr; | |
| 521 | |
| 522 ngx_rbtree_insert(&r->addr_rbtree, &rn->node); | |
| 523 } | |
| 524 | |
| 525 if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) { | |
| 526 goto failed; | |
| 527 } | |
| 528 | |
| 529 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
| 530 goto failed; | |
| 531 } | |
| 532 | |
| 533 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
| 534 if (ctx->event == NULL) { | |
| 535 goto failed; | |
| 536 } | |
| 537 | |
| 538 ctx->event->handler = ngx_resolver_timeout_handler; | |
| 539 ctx->event->data = ctx; | |
| 540 ctx->event->log = r->log; | |
| 541 ctx->ident = -1; | |
| 542 | |
| 543 ngx_add_timer(ctx->event, ctx->timeout); | |
| 544 | |
| 545 if (ngx_queue_empty(&r->addr_resend_queue)) { | |
| 546 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
| 547 } | |
| 548 | |
| 549 rn->expire = ngx_time() + r->resend_timeout; | |
| 550 | |
| 551 ngx_queue_insert_head(&r->addr_resend_queue, &rn->queue); | |
| 552 | |
| 553 rn->cnlen = 0; | |
| 554 rn->naddrs = 0; | |
| 555 rn->name = NULL; | |
| 556 rn->nlen = 0; | |
| 557 rn->valid = 0; | |
| 558 rn->waiting = ctx; | |
| 559 | |
| 560 /* unlock addr mutex */ | |
| 561 | |
| 562 ctx->state = NGX_AGAIN; | |
| 563 | |
| 564 return NGX_OK; | |
| 565 | |
| 566 failed: | |
| 567 | |
| 568 if (rn) { | |
| 569 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 570 | |
| 571 ngx_resolver_free(r, rn); | |
| 572 } | |
| 573 | |
| 574 /* unlock addr mutex */ | |
| 575 | |
| 576 /* lock alloc mutex */ | |
| 577 | |
| 578 if (ctx->event) { | |
| 579 ngx_resolver_free_locked(r, ctx->event); | |
| 580 } | |
| 581 | |
| 582 ngx_resolver_free_locked(r, ctx); | |
| 583 | |
| 584 /* unlock alloc mutex */ | |
| 585 | |
| 586 return NGX_ERROR; | |
| 587 } | |
| 588 | |
| 589 | |
| 590 void | |
| 591 ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx) | |
| 592 { | |
| 593 in_addr_t addr; | |
| 594 ngx_resolver_t *r; | |
| 595 ngx_resolver_ctx_t *w, **p; | |
| 596 ngx_resolver_node_t *rn; | |
| 597 | |
| 598 r = ctx->resolver; | |
| 599 | |
| 600 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 601 "resolve addr done: %i", ctx->state); | |
| 602 | |
| 603 if (ctx->event && ctx->event->timer_set) { | |
| 604 ngx_del_timer(ctx->event); | |
| 605 } | |
| 606 | |
| 607 /* lock addr mutex */ | |
| 608 | |
| 609 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
| 610 | |
| 611 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
| 612 | |
| 613 if (rn) { | |
| 614 p = &rn->waiting; | |
| 615 w = rn->waiting; | |
| 616 | |
| 617 while (w) { | |
| 618 if (w == ctx) { | |
| 619 *p = w->next; | |
| 620 | |
| 621 goto done; | |
| 622 } | |
| 623 | |
| 624 p = &w->next; | |
| 625 w = w->next; | |
| 626 } | |
| 627 } | |
| 628 | |
| 629 addr = ntohl(ctx->addr); | |
| 630 | |
| 631 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
| 632 "could not cancel %ud.%ud.%ud.%ud resolving", | |
| 633 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 634 (addr >> 8) & 0xff, addr & 0xff); | |
| 635 } | |
| 636 | |
| 637 done: | |
| 638 | |
| 639 ngx_resolver_expire(r, &r->addr_rbtree, &r->addr_expire_queue); | |
| 640 | |
| 641 /* unlock addr mutex */ | |
| 642 | |
| 643 ngx_resolver_free(r, ctx); | |
| 644 } | |
| 645 | |
| 646 | |
| 647 static void | |
| 648 ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 649 { | |
| 650 time_t now; | |
| 651 ngx_uint_t i; | |
| 652 ngx_queue_t *q; | |
| 653 ngx_resolver_node_t *rn; | |
| 654 | |
| 655 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire"); | |
| 656 | |
| 657 now = ngx_time(); | |
| 658 | |
| 659 for (i = 0; i < 2; i++) { | |
| 660 if (ngx_queue_empty(queue)) { | |
| 661 return; | |
| 662 } | |
| 663 | |
| 664 q = ngx_queue_last(queue); | |
| 665 | |
| 666 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 667 | |
| 668 if (now <= rn->expire) { | |
| 669 return; | |
| 670 } | |
| 671 | |
| 1774 | 672 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, |
| 673 "resolver expire \"%*s\"", (size_t) rn->nlen, rn->name); | |
| 1649 | 674 |
| 675 ngx_queue_remove(q); | |
| 676 | |
| 677 ngx_rbtree_delete(tree, &rn->node); | |
| 678 | |
| 679 ngx_resolver_free_node(r, rn); | |
| 680 } | |
| 681 } | |
| 682 | |
| 683 | |
| 684 static ngx_int_t | |
| 685 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 686 { | |
| 687 ssize_t n; | |
| 688 ngx_udp_connection_t *uc; | |
| 689 | |
| 690 uc = r->udp_connection; | |
| 691 | |
| 692 if (uc->connection == NULL) { | |
| 693 if (ngx_udp_connect(uc) != NGX_OK) { | |
| 694 return NGX_ERROR; | |
| 695 } | |
| 696 | |
| 697 uc->connection->data = r; | |
| 698 uc->connection->read->handler = ngx_resolver_read_response; | |
| 699 } | |
| 700 | |
| 701 n = ngx_send(uc->connection, rn->query, rn->qlen); | |
| 702 | |
| 703 if (n == -1) { | |
| 704 return NGX_ERROR; | |
| 705 } | |
| 706 | |
| 707 if ((size_t) n != (size_t) rn->qlen) { | |
| 708 ngx_log_error(NGX_LOG_CRIT, uc->log, 0, "send() incomplete"); | |
| 709 return NGX_ERROR; | |
| 710 } | |
| 711 | |
| 712 return NGX_OK; | |
| 713 } | |
| 714 | |
| 715 | |
| 716 static void | |
| 717 ngx_resolver_resend_handler(ngx_event_t *ev) | |
| 718 { | |
| 719 time_t timer, atimer, ntimer; | |
| 720 ngx_resolver_t *r; | |
| 721 | |
| 722 r = ev->data; | |
| 723 | |
| 724 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 725 "resolver resend handler"); | |
| 726 | |
| 727 /* lock name mutex */ | |
| 728 | |
| 729 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue); | |
| 730 | |
| 731 /* unlock name mutex */ | |
| 732 | |
| 733 /* lock addr mutex */ | |
| 734 | |
| 735 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
|
736 |
| 1649 | 737 /* unlock addr mutex */ |
| 738 | |
| 739 if (ntimer == 0) { | |
| 740 timer = atimer; | |
| 741 | |
| 742 } else if (atimer == 0) { | |
| 743 timer = ntimer; | |
| 744 | |
| 745 } else { | |
| 746 timer = (atimer < ntimer) ? atimer : ntimer; | |
| 747 } | |
| 748 | |
| 749 if (timer) { | |
| 750 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000)); | |
| 751 } | |
| 752 } | |
| 753 | |
| 754 | |
| 755 static time_t | |
| 756 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 757 { | |
| 758 time_t now; | |
| 759 ngx_queue_t *q; | |
| 760 ngx_resolver_node_t *rn; | |
| 761 | |
| 762 now = ngx_time(); | |
| 763 | |
| 764 for ( ;; ) { | |
| 765 if (ngx_queue_empty(queue)) { | |
| 766 return 0; | |
| 767 } | |
| 768 | |
| 769 q = ngx_queue_last(queue); | |
| 770 | |
| 771 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 772 | |
| 773 if (now < rn->expire) { | |
| 774 return rn->expire - now; | |
| 775 } | |
| 776 | |
| 1774 | 777 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, |
| 778 "resolver resend \"%*s\" %p", | |
| 779 (size_t) rn->nlen, rn->name, rn->waiting); | |
| 1649 | 780 |
| 781 ngx_queue_remove(q); | |
| 782 | |
| 783 if (rn->waiting) { | |
| 784 | |
| 785 if (ngx_resolver_send_query(r, rn) == NGX_OK) { | |
| 786 | |
| 787 rn->expire = now + r->resend_timeout; | |
| 788 | |
| 789 ngx_queue_insert_head(queue, &rn->queue); | |
| 790 | |
| 791 continue; | |
| 792 } | |
| 793 } | |
| 794 | |
| 795 ngx_rbtree_delete(tree, &rn->node); | |
| 796 | |
| 797 ngx_resolver_free_node(r, rn); | |
| 798 } | |
| 799 } | |
| 800 | |
| 801 | |
| 802 static void | |
| 803 ngx_resolver_read_response(ngx_event_t *rev) | |
| 804 { | |
| 805 ssize_t n; | |
| 806 ngx_connection_t *c; | |
| 807 u_char buf[NGX_RESOLVER_UDP_SIZE]; | |
| 808 | |
| 809 c = rev->data; | |
| 810 | |
| 811 do { | |
| 1689 | 812 n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE); |
| 813 | |
| 814 if (n < 0) { | |
| 1649 | 815 return; |
| 816 } | |
| 817 | |
| 818 ngx_resolver_process_response(c->data, buf, n); | |
| 819 | |
| 820 } while (rev->ready); | |
| 821 } | |
| 822 | |
| 823 | |
| 824 static void | |
| 825 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n) | |
| 826 { | |
| 827 char *err; | |
| 828 size_t len; | |
| 829 ngx_uint_t i, ident, flags, code, nqs, nan, qtype, qclass; | |
| 830 ngx_resolver_qs_t *qs; | |
| 831 ngx_resolver_query_t *query; | |
| 832 | |
| 833 if ((size_t) n < sizeof(ngx_resolver_query_t) + 1) { | |
| 834 goto short_response; | |
| 835 } | |
| 836 | |
| 837 query = (ngx_resolver_query_t *) buf; | |
| 838 | |
| 839 ident = (query->ident_hi << 8) + query->ident_lo; | |
| 840 flags = (query->flags_hi << 8) + query->flags_lo; | |
| 841 nqs = (query->nqs_hi << 8) + query->nqs_lo; | |
| 842 nan = (query->nan_hi << 8) + query->nan_lo; | |
| 843 | |
| 844 ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 845 "resolver DNS response %d fl:%04Xud %d/%d/%d/%d", | |
| 846 ident, flags, nqs, nan, | |
| 847 (query->nns_hi << 8) + query->nns_lo, | |
| 848 (query->nar_hi << 8) + query->nar_lo); | |
| 849 | |
| 850 if (!(flags & 0x8000)) { | |
| 851 ngx_log_error(r->log_level, r->log, 0, | |
| 852 "invalid DNS response %d fl:%04Xud", ident, flags); | |
| 853 return; | |
| 854 } | |
| 855 | |
| 856 code = flags & 0x7f; | |
| 857 | |
| 858 if (code == NGX_RESOLVE_FORMERR || code > NGX_RESOLVE_REFUSED) { | |
| 859 ngx_log_error(r->log_level, r->log, 0, | |
| 860 "DNS error (%d: %s), query id:%d", | |
| 861 code, ngx_resolver_strerror(code), ident); | |
| 862 return; | |
| 863 } | |
| 864 | |
| 865 if (nqs != 1) { | |
| 866 err = "invalid number of questions in DNS response"; | |
| 867 goto done; | |
| 868 } | |
| 869 | |
| 870 i = sizeof(ngx_resolver_query_t); | |
| 871 | |
| 872 while (i < (ngx_uint_t) n) { | |
| 873 if (buf[i] == '\0') { | |
| 874 goto found; | |
| 875 } | |
| 876 | |
| 877 len = buf[i]; | |
| 878 i += 1 + len; | |
| 879 } | |
| 880 | |
| 881 goto short_response; | |
| 882 | |
| 883 found: | |
| 884 | |
| 885 if (i++ == 0) { | |
| 886 err = "zero-length domain name in DNS response"; | |
| 887 goto done; | |
| 888 } | |
| 889 | |
| 890 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t)) | |
| 891 > (ngx_uint_t) n) | |
| 892 { | |
| 893 goto short_response; | |
| 894 } | |
| 895 | |
| 896 qs = (ngx_resolver_qs_t *) &buf[i]; | |
| 897 | |
| 898 qtype = (qs->type_hi << 8) + qs->type_lo; | |
| 899 qclass = (qs->class_hi << 8) + qs->class_lo; | |
| 900 | |
| 901 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 902 "resolver DNS response qt:%d cl:%d", qtype, qclass); | |
| 903 | |
| 904 if (qclass != 1) { | |
| 905 ngx_log_error(r->log_level, r->log, 0, | |
| 906 "unknown query class %d in DNS response", qclass); | |
| 907 return; | |
| 908 } | |
| 909 | |
| 910 switch (qtype) { | |
| 911 | |
| 912 case NGX_RESOLVE_A: | |
| 913 | |
| 914 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
|
915 i + sizeof(ngx_resolver_qs_t)); |
| 1649 | 916 |
| 917 break; | |
| 918 | |
| 919 case NGX_RESOLVE_PTR: | |
| 920 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
921 ngx_resolver_process_ptr(r, buf, n, ident, code, nan); |
| 1649 | 922 |
| 923 break; | |
| 924 | |
| 925 default: | |
| 926 ngx_log_error(r->log_level, r->log, 0, | |
| 927 "unknown query type %d in DNS response", qtype); | |
| 928 return; | |
| 929 } | |
| 930 | |
| 931 return; | |
| 932 | |
| 933 short_response: | |
| 934 | |
| 935 err = "short dns response"; | |
| 936 | |
| 937 done: | |
| 938 | |
| 939 ngx_log_error(r->log_level, r->log, 0, err); | |
| 940 | |
| 941 return; | |
| 942 } | |
| 943 | |
| 944 | |
| 945 static void | |
| 946 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last, | |
| 947 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans) | |
| 583 | 948 { |
| 1649 | 949 char *err; |
| 950 u_char *cname; | |
| 951 size_t len; | |
| 952 uint32_t hash; | |
| 953 in_addr_t addr, *addrs; | |
| 954 ngx_str_t name; | |
| 955 ngx_uint_t qtype, qident, naddrs, a, i, n, start; | |
| 956 ngx_resolver_an_t *an; | |
| 957 ngx_resolver_ctx_t *ctx, *next; | |
| 958 ngx_resolver_node_t *rn; | |
| 959 | |
| 960 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) { | |
| 961 return; | |
| 962 } | |
| 963 | |
| 964 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); | |
| 965 | |
| 966 hash = ngx_crc32_short(name.data, name.len); | |
| 967 | |
| 968 /* lock name mutex */ | |
| 969 | |
| 970 rn = ngx_resolver_lookup_name(r, &name, hash); | |
| 971 | |
| 972 if (rn == NULL || rn->query == NULL) { | |
| 973 ngx_log_error(r->log_level, r->log, 0, | |
| 974 "unexpected response for %V", &name); | |
| 975 goto failed; | |
| 976 } | |
| 977 | |
| 978 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 979 | |
| 980 if (ident != qident) { | |
| 981 ngx_log_error(r->log_level, r->log, 0, | |
| 982 "wrong ident %d response for %V, expect %d", | |
| 983 ident, &name, qident); | |
| 984 goto failed; | |
| 985 } | |
| 986 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
987 if (code == 0 && nan == 0) { |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
988 code = 3; /* NXDOMAIN */ |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
989 } |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
990 |
| 1649 | 991 if (code) { |
| 992 next = rn->waiting; | |
| 993 rn->waiting = NULL; | |
| 994 | |
| 995 ngx_queue_remove(&rn->queue); | |
| 996 | |
| 997 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 998 | |
| 999 ngx_resolver_free_node(r, rn); | |
| 1000 | |
| 1001 /* unlock name mutex */ | |
| 1002 | |
| 1003 while (next) { | |
| 1004 ctx = next; | |
| 1005 ctx->state = code; | |
| 1006 next = ctx->next; | |
| 1007 | |
| 1008 ctx->handler(ctx); | |
| 1009 } | |
| 1010 | |
| 1011 return; | |
| 1012 } | |
| 1013 | |
| 1014 i = ans; | |
| 1015 naddrs = 0; | |
| 1016 addr = 0; | |
| 1017 addrs = NULL; | |
| 1018 cname = NULL; | |
| 1019 qtype = 0; | |
| 1020 | |
| 1021 for (a = 0; a < nan; a++) { | |
| 1022 | |
| 1023 start = i; | |
| 1024 | |
| 1025 while (i < last) { | |
| 1026 | |
| 1027 if (buf[i] & 0xc0) { | |
| 1028 i += 2; | |
| 1029 goto found; | |
| 1030 } | |
| 1031 | |
| 1032 if (buf[i] == 0) { | |
| 1033 i++; | |
| 1034 goto test_length; | |
| 1035 } | |
| 1036 | |
| 1037 i += 1 + buf[i]; | |
| 1038 } | |
| 1039 | |
| 1040 goto short_response; | |
| 1041 | |
| 1042 test_length: | |
| 1043 | |
| 1044 if (i - start < 2) { | |
| 1045 err = "invalid name in dns response"; | |
| 1046 goto invalid; | |
| 1047 } | |
| 1048 | |
| 1049 found: | |
| 1050 | |
| 1051 if (i + sizeof(ngx_resolver_an_t) >= last) { | |
| 1052 goto short_response; | |
| 1053 } | |
| 1054 | |
| 1055 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1056 | |
| 1057 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1058 len = (an->len_hi << 8) + an->len_lo; | |
| 1059 | |
| 1060 if (qtype == NGX_RESOLVE_A) { | |
| 1061 | |
| 1062 i += sizeof(ngx_resolver_an_t); | |
| 1063 | |
| 1064 if (i + len > last) { | |
| 1065 goto short_response; | |
| 1066 } | |
| 1067 | |
| 1068 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1069 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1070 | |
| 1071 naddrs++; | |
| 1072 | |
| 1073 i += len; | |
| 1074 | |
| 1075 } else if (qtype == NGX_RESOLVE_CNAME) { | |
| 1076 cname = &buf[i] + sizeof(ngx_resolver_an_t); | |
| 1077 i += sizeof(ngx_resolver_an_t) + len; | |
| 1078 } | |
| 1079 } | |
| 1080 | |
| 1081 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1082 "resolver naddrs:%ui cname:%p", naddrs, cname); | |
| 1083 | |
| 1084 if (naddrs) { | |
| 1085 | |
| 1086 if (naddrs == 1) { | |
| 1087 rn->u.addr = addr; | |
| 1088 | |
| 1089 } else { | |
| 1090 | |
| 1091 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t)); | |
| 1092 if (addrs == NULL) { | |
| 1093 return; | |
| 1094 } | |
| 1095 | |
| 1096 n = 0; | |
| 1097 i = ans; | |
| 1098 | |
| 1099 for (a = 0; a < nan; a++) { | |
| 1100 | |
| 1101 for ( ;; ) { | |
| 1102 | |
| 1103 if (buf[i] & 0xc0) { | |
| 1104 i += 2; | |
| 1105 goto ok; | |
| 1106 } | |
| 1107 | |
| 1108 if (buf[i] == 0) { | |
| 1109 i++; | |
| 1110 goto ok; | |
| 1111 } | |
| 1112 | |
| 1113 i += 1 + buf[i]; | |
| 1114 } | |
| 1115 | |
| 1116 ok: | |
| 1117 | |
| 1118 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1119 | |
| 1120 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1121 len = (an->len_hi << 8) + an->len_lo; | |
| 1122 | |
| 1123 i += sizeof(ngx_resolver_an_t); | |
| 1124 | |
| 1125 if (qtype == NGX_RESOLVE_A) { | |
| 1126 | |
| 1127 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1128 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1129 | |
| 1130 if (n == naddrs) { | |
| 1131 break; | |
| 1132 } | |
| 1133 } | |
| 1134 | |
| 1135 i += len; | |
| 1136 } | |
| 1137 | |
| 1138 rn->u.addrs = addrs; | |
| 1139 | |
| 1140 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
| 1141 naddrs * sizeof(in_addr_t)); | |
| 1142 if (addrs == NULL) { | |
| 1143 return; | |
| 1144 } | |
| 1145 } | |
| 1146 | |
| 1147 rn->naddrs = (u_short) naddrs; | |
| 1148 | |
| 1149 ngx_queue_remove(&rn->queue); | |
| 1150 | |
| 1151 rn->valid = ngx_time() + r->valid; | |
| 1152 rn->expire = ngx_time() + r->expire; | |
| 1153 | |
| 1154 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1155 | |
| 1156 next = rn->waiting; | |
| 1157 rn->waiting = NULL; | |
| 1158 | |
| 1159 /* unlock name mutex */ | |
| 1160 | |
| 1161 while (next) { | |
| 1162 ctx = next; | |
| 1163 ctx->state = NGX_OK; | |
| 1164 ctx->naddrs = naddrs; | |
| 1165 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 1166 ctx->addr = addr; | |
| 1167 next = ctx->next; | |
| 1168 | |
| 1169 ctx->handler(ctx); | |
| 1170 } | |
| 1171 | |
| 1172 if (naddrs) { | |
| 1173 ngx_resolver_free(r, addrs); | |
| 1174 } | |
| 1175 | |
| 1176 return; | |
| 1177 | |
| 1178 } else if (cname) { | |
| 1179 | |
| 1180 /* CNAME only */ | |
| 1181 | |
| 1182 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) { | |
| 1183 return; | |
| 1184 } | |
| 1185 | |
| 1186 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1187 "resolver cname:\"%V\"", &name); | |
| 1188 | |
|
1741
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1189 ngx_queue_remove(&rn->queue); |
|
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1190 |
| 1649 | 1191 rn->cnlen = (u_short) name.len; |
| 1192 rn->u.cname = name.data; | |
| 1193 rn->valid = ngx_time() + r->valid; | |
| 1194 rn->expire = ngx_time() + r->expire; | |
| 1195 | |
| 1196 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1197 | |
| 1198 ctx = rn->waiting; | |
| 1199 rn->waiting = NULL; | |
| 1200 | |
| 1201 if (ctx) { | |
| 1202 ctx->name = name; | |
| 1203 | |
| 1204 (void) ngx_resolve_name_locked(r, ctx); | |
| 1205 } | |
| 1206 | |
| 1207 return; | |
| 1208 } | |
| 1209 | |
| 1210 ngx_log_error(r->log_level, r->log, 0, | |
| 1211 "no A or CNAME types in DNS responses, unknown query type: %d", | |
| 1212 qtype); | |
| 1213 return; | |
| 1214 | |
| 1215 short_response: | |
| 1216 | |
| 1217 err = "short dns response"; | |
| 1218 | |
| 1219 invalid: | |
| 1220 | |
| 1221 /* unlock name mutex */ | |
| 1222 | |
| 1223 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1224 | |
| 1225 return; | |
| 1226 | |
| 1227 failed: | |
| 1228 | |
| 1229 /* unlock name mutex */ | |
| 1230 | |
| 1231 return; | |
| 1232 } | |
| 1233 | |
| 1234 | |
| 1235 static void | |
| 1236 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
|
1237 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan) |
| 1649 | 1238 { |
| 1239 char *err; | |
| 1240 size_t len; | |
| 1241 in_addr_t addr; | |
| 1242 ngx_int_t digit; | |
| 1243 ngx_str_t name; | |
| 1244 ngx_uint_t i, mask, qtype, qclass, qident; | |
| 1245 ngx_resolver_an_t *an; | |
| 1246 ngx_resolver_ctx_t *ctx, *next; | |
| 1247 ngx_resolver_node_t *rn; | |
| 1248 | |
| 1249 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) { | |
| 1250 goto invalid_in_addr_arpa; | |
| 1251 } | |
| 1252 | |
| 1253 addr = 0; | |
| 1254 i = 12; | |
| 1255 | |
| 1256 for (mask = 0; mask < 32; mask += 8) { | |
| 1257 len = buf[i++]; | |
| 1258 | |
| 1259 digit = ngx_atoi(&buf[i], len); | |
| 1260 if (digit == NGX_ERROR || digit > 255) { | |
| 1261 goto invalid_in_addr_arpa; | |
| 1262 } | |
| 1263 | |
| 1264 addr += digit << mask; | |
| 1265 i += len; | |
| 1266 } | |
| 1267 | |
| 1268 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) { | |
| 1269 goto invalid_in_addr_arpa; | |
| 1270 } | |
| 1271 | |
| 1272 /* lock addr mutex */ | |
| 1273 | |
| 1274 rn = ngx_resolver_lookup_addr(r, addr); | |
| 1275 | |
| 1276 if (rn == NULL || rn->query == NULL) { | |
| 1277 ngx_log_error(r->log_level, r->log, 0, | |
| 1278 "unexpected response for %ud.%ud.%ud.%ud", | |
| 1279 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 1280 (addr >> 8) & 0xff, addr & 0xff); | |
| 1281 goto failed; | |
| 1282 } | |
| 1283 | |
| 1284 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 1285 | |
| 1286 if (ident != qident) { | |
| 1287 ngx_log_error(r->log_level, r->log, 0, | |
| 1288 "wrong ident %d response for %ud.%ud.%ud.%ud, expect %d", | |
| 1289 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 1290 (addr >> 8) & 0xff, addr & 0xff, qident); | |
| 1291 goto failed; | |
| 1292 } | |
| 1293 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1294 if (code == 0 && nan == 0) { |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1295 code = 3; /* NXDOMAIN */ |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1296 } |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1297 |
| 1649 | 1298 if (code) { |
| 1299 next = rn->waiting; | |
| 1300 rn->waiting = NULL; | |
| 1301 | |
| 1302 ngx_queue_remove(&rn->queue); | |
| 1303 | |
| 1304 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 1305 | |
| 1306 ngx_resolver_free_node(r, rn); | |
| 1307 | |
| 1308 /* unlock addr mutex */ | |
| 1309 | |
| 1310 while (next) { | |
| 1311 ctx = next; | |
| 1312 ctx->state = code; | |
| 1313 next = ctx->next; | |
| 1314 | |
| 1315 ctx->handler(ctx); | |
| 1316 } | |
| 1317 | |
| 1318 return; | |
| 1319 } | |
| 1320 | |
| 1321 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t); | |
| 1322 | |
| 1323 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) { | |
| 1324 goto short_response; | |
| 1325 } | |
| 1326 | |
| 1327 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */ | |
| 1328 | |
| 1329 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) { | |
| 1330 err = "invalid in-addr.arpa name in DNS response"; | |
| 1331 goto invalid; | |
| 1332 } | |
| 1333 | |
| 1334 an = (ngx_resolver_an_t *) &buf[i + 2]; | |
| 1335 | |
| 1336 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1337 qclass = (an->class_hi << 8) + an->class_lo; | |
| 1338 len = (an->len_hi << 8) + an->len_lo; | |
| 1339 | |
| 1340 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1341 "resolver qt:%d cl:%d len:%uz", qtype, qclass, len); | |
| 1342 | |
| 1343 i += 2 + sizeof(ngx_resolver_an_t); | |
| 1344 | |
| 1345 if (i + len > (ngx_uint_t) n) { | |
| 1346 goto short_response; | |
| 1347 } | |
| 1348 | |
| 1349 len -= 2; | |
| 1350 | |
| 1351 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) { | |
| 1352 return; | |
| 1353 } | |
| 1354 | |
| 1355 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name); | |
| 1356 | |
| 1357 if (len != (size_t) rn->nlen || ngx_strncmp(name.data, rn->name, len) != 0) | |
| 1358 { | |
| 1359 ngx_resolver_free(r, rn->name); | |
| 1360 rn->name = name.data; | |
| 1361 | |
| 1362 name.data = ngx_resolver_dup(r, rn->name, len); | |
| 1363 if (name.data == NULL) { | |
| 1364 goto failed; | |
| 1365 } | |
| 1366 } | |
| 1367 | |
| 1368 ngx_queue_remove(&rn->queue); | |
| 1369 | |
| 1370 rn->valid = ngx_time() + r->valid; | |
| 1371 rn->expire = ngx_time() + r->expire; | |
| 1372 | |
| 1373 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
| 1374 | |
| 1375 next = rn->waiting; | |
| 1376 rn->waiting = NULL; | |
| 1377 | |
| 1378 /* unlock addr mutex */ | |
| 1379 | |
| 1380 while (next) { | |
| 1381 ctx = next; | |
| 1382 ctx->state = NGX_OK; | |
| 1383 ctx->name = name; | |
| 1384 next = ctx->next; | |
| 1385 | |
| 1386 ctx->handler(ctx); | |
| 1387 } | |
| 1388 | |
| 1389 ngx_resolver_free(r, name.data); | |
| 1390 | |
| 1391 return; | |
| 1392 | |
| 1393 invalid_in_addr_arpa: | |
| 1394 | |
| 1395 ngx_log_error(r->log_level, r->log, 0, | |
| 1396 "invalid in-addr.arpa name in DNS response"); | |
| 1397 return; | |
| 1398 | |
| 1399 short_response: | |
| 1400 | |
| 1401 err = "short DNS response"; | |
| 1402 | |
| 1403 invalid: | |
| 1404 | |
| 1405 /* unlock addr mutex */ | |
| 1406 | |
| 1407 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1408 | |
| 1409 return; | |
| 1410 | |
| 1411 failed: | |
| 1412 | |
| 1413 /* unlock addr mutex */ | |
| 1414 | |
| 1415 return; | |
| 1416 } | |
| 1417 | |
| 1418 | |
| 1419 static ngx_resolver_node_t * | |
| 1420 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) | |
| 1421 { | |
| 1422 ngx_int_t rc; | |
| 1423 size_t len; | |
| 1424 ngx_rbtree_node_t *node, *sentinel; | |
| 1425 ngx_resolver_node_t *rn; | |
| 1426 | |
| 1427 node = r->name_rbtree.root; | |
| 1428 sentinel = r->name_rbtree.sentinel; | |
| 1429 | |
| 1430 while (node != sentinel) { | |
| 1431 | |
| 1432 if (hash < node->key) { | |
| 1433 node = node->left; | |
| 1434 continue; | |
| 1435 } | |
| 1436 | |
| 1437 if (hash > node->key) { | |
| 1438 node = node->right; | |
| 1439 continue; | |
| 1440 } | |
| 1441 | |
| 1442 /* hash == node->key */ | |
| 1443 | |
| 1444 do { | |
| 1445 rn = (ngx_resolver_node_t *) node; | |
| 1446 | |
| 1447 len = (name->len > (size_t) rn->nlen) ? rn->nlen : name->len; | |
| 1448 | |
| 1449 rc = ngx_strncmp(name->data, rn->name, len); | |
| 1450 | |
| 1451 if (rc == 0) { | |
| 1452 return rn; | |
| 1453 } | |
| 1454 | |
| 1455 node = (rc < 0) ? node->left : node->right; | |
| 1456 | |
| 1457 } while (node != sentinel && hash == node->key); | |
| 1458 | |
| 1459 break; | |
| 1460 } | |
| 1461 | |
| 1462 /* not found */ | |
| 1463 | |
| 1464 return NULL; | |
| 1465 } | |
| 1466 | |
| 1467 | |
| 1468 static ngx_resolver_node_t * | |
| 1469 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr) | |
| 1470 { | |
| 1471 ngx_rbtree_node_t *node, *sentinel; | |
| 1472 | |
| 1473 node = r->addr_rbtree.root; | |
| 1474 sentinel = r->addr_rbtree.sentinel; | |
| 1475 | |
| 1476 while (node != sentinel) { | |
| 1477 | |
| 1478 if (addr < node->key) { | |
| 1479 node = node->left; | |
| 1480 continue; | |
| 1481 } | |
| 1482 | |
| 1483 if (addr > node->key) { | |
| 1484 node = node->right; | |
| 1485 continue; | |
| 1486 } | |
| 1487 | |
| 1488 /* addr == node->key */ | |
| 1489 | |
| 1490 return (ngx_resolver_node_t *) node; | |
| 1491 } | |
| 1492 | |
| 1493 /* not found */ | |
| 1494 | |
| 1495 return NULL; | |
| 1496 } | |
| 1497 | |
| 1498 | |
| 1499 static void | |
| 1500 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
| 1501 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
| 1502 { | |
| 1503 size_t len; | |
| 1504 ngx_rbtree_node_t **p; | |
| 1505 ngx_resolver_node_t *rn, *rn_temp; | |
| 1506 | |
| 1507 for ( ;; ) { | |
| 1508 | |
| 1509 if (node->key < temp->key) { | |
| 1510 | |
| 1511 p = &temp->left; | |
| 1512 | |
| 1513 } else if (node->key > temp->key) { | |
| 1514 | |
| 1515 p = &temp->right; | |
| 1516 | |
| 1517 } else { /* node->key == temp->key */ | |
| 1518 | |
| 1519 rn = (ngx_resolver_node_t *) node; | |
| 1520 rn_temp = (ngx_resolver_node_t *) temp; | |
| 1521 | |
| 1522 len = (rn->nlen > rn_temp->nlen) ? rn_temp->nlen : rn->nlen; | |
| 1523 | |
| 1524 p = (ngx_strncmp(rn->name, rn_temp->name, len) < 0) | |
| 1525 ? &temp->left : &temp->right; | |
| 1526 } | |
| 1527 | |
| 1528 if (*p == sentinel) { | |
| 1529 break; | |
| 1530 } | |
| 1531 | |
| 1532 temp = *p; | |
| 1533 } | |
| 1534 | |
| 1535 *p = node; | |
| 1536 node->parent = temp; | |
| 1537 node->left = sentinel; | |
| 1538 node->right = sentinel; | |
| 1539 ngx_rbt_red(node); | |
| 1540 } | |
| 1541 | |
| 1542 | |
| 1543 static ngx_int_t | |
| 1544 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1545 { | |
| 1546 u_char *p, *s; | |
| 1547 size_t len; | |
| 1548 ngx_uint_t ident; | |
| 1549 ngx_resolver_qs_t *qs; | |
| 1550 ngx_resolver_query_t *query; | |
| 1551 | |
| 1552 len = sizeof(ngx_resolver_query_t) | |
| 1553 + 1 + ctx->name.len + 1 + sizeof(ngx_resolver_qs_t); | |
| 1554 | |
| 1555 p = ngx_resolver_calloc(ctx->resolver, len); | |
| 1556 if (p == NULL) { | |
| 1557 return NGX_ERROR; | |
| 1558 } | |
| 1559 | |
| 1560 rn->qlen = (u_short) len; | |
| 1561 rn->query = p; | |
| 1562 | |
| 1563 query = (ngx_resolver_query_t *) p; | |
| 1564 | |
| 1565 ident = ngx_random(); | |
| 1566 | |
| 1567 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0, | |
| 1568 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff); | |
| 1569 | |
| 1570 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1571 query->ident_lo = (u_char) (ident & 0xff); | |
| 1572 | |
| 1573 /* recursion query */ | |
| 1574 query->flags_hi = 1; query->flags_lo = 0; | |
| 1575 | |
| 1576 /* one question */ | |
| 1577 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1578 query->nan_hi = 0; query->nan_lo = 0; | |
| 1579 query->nns_hi = 0; query->nns_lo = 0; | |
| 1580 query->nar_hi = 0; query->nar_lo = 0; | |
| 1581 | |
| 1582 p += sizeof(ngx_resolver_query_t) + 1 + ctx->name.len + 1; | |
| 1583 | |
| 1584 qs = (ngx_resolver_qs_t *) p; | |
| 1585 | |
| 1586 /* query type */ | |
| 1587 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type; | |
| 1588 | |
| 1589 /* IP query class */ | |
| 1590 qs->class_hi = 0; qs->class_lo = 1; | |
| 1591 | |
| 1592 /* convert "www.example.com" to "\3www\7example\3com\0" */ | |
| 1593 | |
| 1594 len = 0; | |
| 1595 p--; | |
| 1596 *p-- = '\0'; | |
| 1597 | |
| 1598 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) { | |
| 1599 if (*s != '.') { | |
| 1600 *p = *s; | |
| 1601 len++; | |
| 1602 | |
| 1603 } else { | |
| 1604 *p = (u_char) len; | |
| 1605 len = 0; | |
| 1606 } | |
| 1607 | |
| 1608 p--; | |
| 1609 } | |
| 1610 | |
| 1611 *p = (u_char) len; | |
| 1612 | |
| 1613 return NGX_OK; | |
| 1614 } | |
| 1615 | |
| 1616 | |
| 1617 /* AF_INET only */ | |
| 1618 | |
| 1619 static ngx_int_t | |
| 1620 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1621 { | |
| 1622 u_char *p, *d; | |
| 1623 size_t len; | |
| 1624 ngx_int_t n; | |
| 1625 ngx_uint_t ident; | |
| 1626 ngx_resolver_query_t *query; | |
| 1627 | |
| 1628 len = sizeof(ngx_resolver_query_t) | |
| 1629 + sizeof(".255.255.255.255.in-addr.arpa.") - 1 | |
| 1630 + sizeof(ngx_resolver_qs_t); | |
| 1631 | |
| 1632 p = ngx_resolver_calloc(ctx->resolver, len); | |
| 1633 if (p == NULL) { | |
| 1634 return NGX_ERROR; | |
| 1635 } | |
| 1636 | |
| 1637 rn->query = p; | |
| 1638 query = (ngx_resolver_query_t *) p; | |
| 1639 | |
| 1640 ident = ngx_random(); | |
| 1641 | |
| 1642 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1643 query->ident_lo = (u_char) (ident & 0xff); | |
| 1644 | |
| 1645 /* recursion query */ | |
| 1646 query->flags_hi = 1; query->flags_lo = 0; | |
| 1647 | |
| 1648 /* one question */ | |
| 1649 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1650 query->nan_hi = 0; query->nan_lo = 0; | |
| 1651 query->nns_hi = 0; query->nns_lo = 0; | |
| 1652 query->nar_hi = 0; query->nar_lo = 0; | |
| 1653 | |
| 1654 p += sizeof(ngx_resolver_query_t); | |
| 1655 | |
| 1656 for (n = 0; n < 32; n += 8){ | |
| 1657 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff); | |
| 1658 *p = (u_char) (d - &p[1]); | |
| 1659 p = d; | |
| 1660 } | |
| 1661 | |
| 1662 /* query type "PTR", IP query class */ | |
| 1663 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18); | |
| 1664 | |
| 1665 rn->qlen = (u_short) | |
| 1666 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t) | |
| 1667 - rn->query); | |
| 1668 | |
| 1669 return NGX_OK; | |
| 1670 } | |
| 1671 | |
| 1672 | |
| 1673 static ngx_int_t | |
| 1674 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src, | |
| 1675 u_char *last) | |
| 1676 { | |
| 1677 char *err; | |
| 1678 u_char *p, *dst; | |
| 1679 ssize_t len; | |
| 1680 ngx_uint_t i, n; | |
| 1681 | |
| 1682 p = src; | |
| 1683 len = -1; | |
| 1684 | |
| 1685 /* | |
| 1686 * compression pointers allow to create endless loop, so we set limit; | |
| 1687 * 128 pointers should be enough to store 255-byte name | |
| 1688 */ | |
| 1689 | |
| 1690 for (i = 0; i < 128; i++) { | |
| 1691 n = *p++; | |
| 1692 | |
| 1693 if (n == 0) { | |
| 1694 goto done; | |
| 1695 } | |
| 1696 | |
| 1697 if (n & 0xc0) { | |
| 1698 n = (n & 0x3f << 8) + *p; | |
| 1699 p = &buf[n]; | |
| 1700 | |
| 1701 } else { | |
| 1702 len += 1 + n; | |
| 1703 p = &p[n]; | |
| 1704 } | |
| 1705 | |
| 1706 if (p >= last) { | |
| 1707 err = "name is out of response"; | |
| 1708 goto invalid; | |
| 1709 } | |
| 1710 } | |
| 1711 | |
| 1712 err = "compression pointers loop"; | |
| 1713 | |
| 1714 invalid: | |
| 1715 | |
| 1716 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1717 | |
| 1718 return NGX_ERROR; | |
| 1719 | |
| 1720 done: | |
| 1721 | |
| 1722 if (name == NULL) { | |
| 583 | 1723 return NGX_OK; |
| 1724 } | |
| 1725 | |
| 1649 | 1726 dst = ngx_resolver_alloc(r, len); |
| 1727 if (dst == NULL) { | |
| 1728 return NGX_ERROR; | |
| 1729 } | |
| 1730 | |
| 1731 name->data = dst; | |
| 1732 | |
| 1733 n = *src++; | |
| 1734 | |
| 1735 for ( ;; ) { | |
| 1736 if (n != 0xc0) { | |
| 1737 ngx_memcpy(dst, src, n); | |
| 1738 dst += n; | |
| 1739 src += n; | |
| 1740 | |
| 1741 n = *src++; | |
| 1742 | |
| 1743 if (n != 0) { | |
| 1744 *dst++ = '.'; | |
| 1745 } | |
| 1746 | |
| 1747 } else { | |
| 1748 n = (n & 0x3f << 8) + *src; | |
| 1749 src = &buf[n]; | |
| 1750 | |
| 1751 n = *src++; | |
| 1752 } | |
| 1753 | |
| 1754 if (n == 0) { | |
| 1755 name->len = dst - name->data; | |
| 1756 return NGX_OK; | |
| 1757 } | |
| 1758 } | |
| 1759 } | |
| 1760 | |
| 1761 | |
| 1762 static void | |
| 1763 ngx_resolver_timeout_handler(ngx_event_t *ev) | |
| 1764 { | |
| 1765 ngx_resolver_ctx_t *ctx; | |
| 1766 | |
| 1767 ctx = ev->data; | |
| 1768 | |
| 1769 ctx->state = NGX_RESOLVE_TIMEDOUT; | |
| 1770 | |
| 1771 ctx->handler(ctx); | |
| 1772 } | |
| 1773 | |
| 1774 | |
| 1775 static void | |
| 1776 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 1777 { | |
| 1778 /* lock alloc mutex */ | |
| 1779 | |
| 1780 if (rn->query) { | |
| 1781 ngx_resolver_free_locked(r, rn->query); | |
| 1782 } | |
| 1783 | |
| 1784 if (rn->name) { | |
| 1785 ngx_resolver_free_locked(r, rn->name); | |
| 1786 } | |
| 1787 | |
| 1788 if (rn->cnlen) { | |
| 1789 ngx_resolver_free_locked(r, rn->u.cname); | |
| 1790 } | |
| 1791 | |
| 1792 if (rn->naddrs > 1) { | |
| 1793 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 1794 } | |
| 1795 | |
| 1796 ngx_resolver_free_locked(r, rn); | |
| 1797 | |
| 1798 /* unlock alloc mutex */ | |
| 1799 } | |
| 1800 | |
| 1801 | |
| 1802 static void * | |
| 1803 ngx_resolver_alloc(ngx_resolver_t *r, size_t size) | |
| 1804 { | |
| 1805 u_char *p; | |
| 1806 | |
| 1807 /* lock alloc mutex */ | |
| 1808 | |
| 1809 p = ngx_alloc(size, r->log); | |
| 1810 | |
| 1811 /* unlock alloc mutex */ | |
| 1812 | |
| 1813 return p; | |
| 1814 } | |
| 1815 | |
| 1816 | |
| 1817 void * | |
| 1818 ngx_resolver_calloc(ngx_resolver_t *r, size_t size) | |
| 1819 { | |
| 1820 u_char *p; | |
| 1821 | |
| 1822 p = ngx_resolver_alloc(r, size); | |
| 1823 | |
| 1824 if (p) { | |
| 1825 ngx_memzero(p, size); | |
| 1826 } | |
| 1827 | |
| 1828 return p; | |
| 1829 } | |
| 1830 | |
| 1831 | |
| 1832 static void | |
| 1833 ngx_resolver_free(ngx_resolver_t *r, void *p) | |
| 1834 { | |
| 1835 /* lock alloc mutex */ | |
| 1836 | |
| 1837 ngx_free(p); | |
| 1838 | |
| 1839 /* unlock alloc mutex */ | |
| 1840 } | |
| 1841 | |
| 1842 | |
| 1843 static void | |
| 1844 ngx_resolver_free_locked(ngx_resolver_t *r, void *p) | |
| 1845 { | |
| 1846 ngx_free(p); | |
| 1847 } | |
| 1848 | |
| 1849 | |
| 1850 static void * | |
| 1851 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size) | |
| 1852 { | |
| 1853 void *dst; | |
| 1854 | |
| 1855 dst = ngx_resolver_alloc(r, size); | |
| 1856 | |
| 1857 if (dst == NULL) { | |
| 1858 return dst; | |
| 1859 } | |
| 1860 | |
| 1861 ngx_memcpy(dst, src, size); | |
| 1862 | |
| 1863 return dst; | |
| 1864 } | |
| 1865 | |
| 1866 | |
| 1867 char * | |
| 1868 ngx_resolver_strerror(ngx_int_t err) | |
| 1869 { | |
| 1870 static char *errors[] = { | |
| 1871 "Format error", /* FORMERR */ | |
| 1872 "Server failure", /* SERVFAIL */ | |
| 1873 "Host not found", /* NXDOMAIN */ | |
| 1874 "Unimplemented", /* NOTIMP */ | |
| 1875 "Operation refused" /* REFUSED */ | |
| 1876 }; | |
| 1877 | |
| 1878 if (err > 0 && err < 6) { | |
| 1879 return errors[err - 1]; | |
| 1880 } | |
| 1881 | |
| 1882 if (err == NGX_RESOLVE_TIMEDOUT) { | |
| 1883 return "Operation timed out"; | |
| 1884 } | |
| 1885 | |
| 1886 return "Unknown error"; | |
| 1887 } | |
| 1888 | |
| 1889 | |
| 1890 ngx_int_t | |
| 1891 ngx_udp_connect(ngx_udp_connection_t *uc) | |
| 1892 { | |
| 1893 int rc; | |
| 1894 ngx_int_t event; | |
| 1895 ngx_event_t *rev, *wev; | |
| 1896 ngx_socket_t s; | |
| 1897 ngx_connection_t *c; | |
| 1898 | |
| 583 | 1899 s = ngx_socket(AF_INET, SOCK_DGRAM, 0); |
| 1900 | |
| 1649 | 1901 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, uc->log, 0, "UDP socket %d", s); |
| 583 | 1902 |
| 1903 if (s == -1) { | |
| 1649 | 1904 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
| 583 | 1905 ngx_socket_n " failed"); |
| 1906 return NGX_ERROR; | |
| 1907 } | |
| 1908 | |
| 1649 | 1909 c = ngx_get_connection(s, uc->log); |
| 583 | 1910 |
| 1911 if (c == NULL) { | |
| 1912 if (ngx_close_socket(s) == -1) { | |
| 1649 | 1913 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
| 583 | 1914 ngx_close_socket_n "failed"); |
| 1915 } | |
| 1916 | |
| 1917 return NGX_ERROR; | |
| 1918 } | |
| 1919 | |
| 1649 | 1920 if (ngx_nonblocking(s) == -1) { |
| 1921 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
| 1922 ngx_nonblocking_n " failed"); | |
| 1923 | |
| 1924 ngx_free_connection(c); | |
| 1925 | |
| 1926 if (ngx_close_socket(s) == -1) { | |
| 1927 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
| 1928 ngx_close_socket_n " failed"); | |
| 1929 } | |
| 1930 | |
| 1931 return NGX_ERROR; | |
| 1932 } | |
| 1933 | |
| 583 | 1934 rev = c->read; |
| 1935 wev = c->write; | |
| 1936 | |
| 1649 | 1937 rev->log = uc->log; |
| 1938 wev->log = uc->log; | |
| 1939 | |
| 1940 uc->connection = c; | |
| 583 | 1941 |
| 1942 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); | |
| 1943 | |
| 1944 #if (NGX_THREADS) | |
| 1649 | 1945 |
| 1946 /* TODO: lock event when call completion handler */ | |
| 1947 | |
| 1948 rev->lock = &c->lock; | |
| 1949 wev->lock = &c->lock; | |
| 583 | 1950 rev->own_lock = &c->lock; |
| 1951 wev->own_lock = &c->lock; | |
| 1649 | 1952 |
| 583 | 1953 #endif |
| 1954 | |
| 1649 | 1955 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, uc->log, 0, |
| 1956 "connect to %V, fd:%d #%d", &uc->server, s, c->number); | |
| 1957 | |
| 1958 rc = connect(s, uc->sockaddr, uc->socklen); | |
| 1959 | |
| 1960 /* TODO: aio, iocp */ | |
| 583 | 1961 |
| 1962 if (rc == -1) { | |
| 1649 | 1963 ngx_log_error(NGX_LOG_CRIT, uc->log, ngx_socket_errno, |
| 1964 "connect() to %V failed", &uc->server); | |
| 583 | 1965 |
| 1966 return NGX_ERROR; | |
| 1967 } | |
| 1968 | |
| 1649 | 1969 /* UDP sockets are always ready to write */ |
| 1970 wev->ready = 1; | |
| 1971 | |
| 1972 if (ngx_add_event) { | |
| 1973 | |
| 1974 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ? | |
| 1975 /* kqueue, epoll */ NGX_CLEAR_EVENT: | |
| 1976 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT; | |
| 1977 /* eventport event type has no meaning: oneshot only */ | |
| 1978 | |
| 1979 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { | |
| 1980 return NGX_ERROR; | |
| 1981 } | |
| 1982 | |
| 1983 } else { | |
| 1984 /* rtsig */ | |
| 1985 | |
| 583 | 1986 if (ngx_add_conn(c) == NGX_ERROR) { |
| 1987 return NGX_ERROR; | |
| 1988 } | |
| 1989 } | |
| 1990 | |
| 1991 return NGX_OK; | |
| 1992 } |