Mercurial > hg > nginx
annotate src/core/ngx_resolver.c @ 1689:0b592a68aade
ngx_udp_recv()
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Mon, 03 Dec 2007 16:46:46 +0000 |
| parents | 568d432effb9 |
| children | 0829024c924d |
| 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, | |
| 70 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t i); | |
| 71 static void ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, | |
| 72 ngx_uint_t ident, ngx_uint_t code); | |
| 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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131 if (addr) { |
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132 uc = ngx_calloc(sizeof(ngx_udp_connection_t), log); |
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133 if (uc == NULL) { |
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134 return NULL; |
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parents:
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135 } |
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parents:
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136 |
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parents:
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137 r->udp_connection = uc; |
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1e0b028055ec
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Igor Sysoev <igor@sysoev.ru>
parents:
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138 |
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parents:
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139 uc->sockaddr = addr->sockaddr; |
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parents:
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diff
changeset
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140 uc->socklen = addr->socklen; |
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1e0b028055ec
allow to use IP addresses without defined resolver
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parents:
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changeset
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141 uc->server = addr->name; |
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1e0b028055ec
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parents:
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diff
changeset
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142 uc->log = log; |
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1e0b028055ec
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Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
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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 | |
|
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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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170 if (r->udp_connection == NULL) { |
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1e0b028055ec
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parents:
1679
diff
changeset
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171 return NGX_NO_RESOLVER; |
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1e0b028055ec
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Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
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172 } |
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parents:
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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 | |
| 672 #if (NGX_DEBUG) | |
| 673 { | |
| 674 ngx_str_t s; | |
| 675 | |
| 676 s.len = rn->nlen; | |
| 677 s.data = rn->name; | |
| 678 | |
| 679 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 680 "resolver expire \"%V\"", &s); | |
| 681 } | |
| 682 #endif | |
| 683 | |
| 684 ngx_queue_remove(q); | |
| 685 | |
| 686 ngx_rbtree_delete(tree, &rn->node); | |
| 687 | |
| 688 ngx_resolver_free_node(r, rn); | |
| 689 } | |
| 690 } | |
| 691 | |
| 692 | |
| 693 static ngx_int_t | |
| 694 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 695 { | |
| 696 ssize_t n; | |
| 697 ngx_udp_connection_t *uc; | |
| 698 | |
| 699 uc = r->udp_connection; | |
| 700 | |
| 701 if (uc->connection == NULL) { | |
| 702 if (ngx_udp_connect(uc) != NGX_OK) { | |
| 703 return NGX_ERROR; | |
| 704 } | |
| 705 | |
| 706 uc->connection->data = r; | |
| 707 uc->connection->read->handler = ngx_resolver_read_response; | |
| 708 } | |
| 709 | |
| 710 n = ngx_send(uc->connection, rn->query, rn->qlen); | |
| 711 | |
| 712 if (n == -1) { | |
| 713 return NGX_ERROR; | |
| 714 } | |
| 715 | |
| 716 if ((size_t) n != (size_t) rn->qlen) { | |
| 717 ngx_log_error(NGX_LOG_CRIT, uc->log, 0, "send() incomplete"); | |
| 718 return NGX_ERROR; | |
| 719 } | |
| 720 | |
| 721 return NGX_OK; | |
| 722 } | |
| 723 | |
| 724 | |
| 725 static void | |
| 726 ngx_resolver_resend_handler(ngx_event_t *ev) | |
| 727 { | |
| 728 time_t timer, atimer, ntimer; | |
| 729 ngx_resolver_t *r; | |
| 730 | |
| 731 r = ev->data; | |
| 732 | |
| 733 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 734 "resolver resend handler"); | |
| 735 | |
| 736 /* lock name mutex */ | |
| 737 | |
| 738 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue); | |
| 739 | |
| 740 /* unlock name mutex */ | |
| 741 | |
| 742 /* lock addr mutex */ | |
| 743 | |
| 744 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
|
745 |
| 1649 | 746 /* unlock addr mutex */ |
| 747 | |
| 748 if (ntimer == 0) { | |
| 749 timer = atimer; | |
| 750 | |
| 751 } else if (atimer == 0) { | |
| 752 timer = ntimer; | |
| 753 | |
| 754 } else { | |
| 755 timer = (atimer < ntimer) ? atimer : ntimer; | |
| 756 } | |
| 757 | |
| 758 if (timer) { | |
| 759 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000)); | |
| 760 } | |
| 761 } | |
| 762 | |
| 763 | |
| 764 static time_t | |
| 765 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 766 { | |
| 767 time_t now; | |
| 768 ngx_queue_t *q; | |
| 769 ngx_resolver_node_t *rn; | |
| 770 | |
| 771 now = ngx_time(); | |
| 772 | |
| 773 for ( ;; ) { | |
| 774 if (ngx_queue_empty(queue)) { | |
| 775 return 0; | |
| 776 } | |
| 777 | |
| 778 q = ngx_queue_last(queue); | |
| 779 | |
| 780 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 781 | |
| 782 if (now < rn->expire) { | |
| 783 return rn->expire - now; | |
| 784 } | |
| 785 | |
| 786 #if (NGX_DEBUG) | |
| 787 { | |
| 788 ngx_str_t s; | |
| 789 | |
| 790 s.len = rn->nlen; | |
| 791 s.data = rn->name; | |
| 792 | |
| 793 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 794 "resolver resend \"%V\" %p", &s, rn->waiting); | |
| 795 } | |
| 796 #endif | |
| 797 | |
| 798 ngx_queue_remove(q); | |
| 799 | |
| 800 if (rn->waiting) { | |
| 801 | |
| 802 if (ngx_resolver_send_query(r, rn) == NGX_OK) { | |
| 803 | |
| 804 rn->expire = now + r->resend_timeout; | |
| 805 | |
| 806 ngx_queue_insert_head(queue, &rn->queue); | |
| 807 | |
| 808 continue; | |
| 809 } | |
| 810 } | |
| 811 | |
| 812 ngx_rbtree_delete(tree, &rn->node); | |
| 813 | |
| 814 ngx_resolver_free_node(r, rn); | |
| 815 } | |
| 816 } | |
| 817 | |
| 818 | |
| 819 static void | |
| 820 ngx_resolver_read_response(ngx_event_t *rev) | |
| 821 { | |
| 822 ssize_t n; | |
| 823 ngx_connection_t *c; | |
| 824 u_char buf[NGX_RESOLVER_UDP_SIZE]; | |
| 825 | |
| 826 c = rev->data; | |
| 827 | |
| 828 do { | |
| 1689 | 829 n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE); |
| 830 | |
| 831 if (n < 0) { | |
| 1649 | 832 return; |
| 833 } | |
| 834 | |
| 835 ngx_resolver_process_response(c->data, buf, n); | |
| 836 | |
| 837 } while (rev->ready); | |
| 838 } | |
| 839 | |
| 840 | |
| 841 static void | |
| 842 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n) | |
| 843 { | |
| 844 char *err; | |
| 845 size_t len; | |
| 846 ngx_uint_t i, ident, flags, code, nqs, nan, qtype, qclass; | |
| 847 ngx_resolver_qs_t *qs; | |
| 848 ngx_resolver_query_t *query; | |
| 849 | |
| 850 if ((size_t) n < sizeof(ngx_resolver_query_t) + 1) { | |
| 851 goto short_response; | |
| 852 } | |
| 853 | |
| 854 query = (ngx_resolver_query_t *) buf; | |
| 855 | |
| 856 ident = (query->ident_hi << 8) + query->ident_lo; | |
| 857 flags = (query->flags_hi << 8) + query->flags_lo; | |
| 858 nqs = (query->nqs_hi << 8) + query->nqs_lo; | |
| 859 nan = (query->nan_hi << 8) + query->nan_lo; | |
| 860 | |
| 861 ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 862 "resolver DNS response %d fl:%04Xud %d/%d/%d/%d", | |
| 863 ident, flags, nqs, nan, | |
| 864 (query->nns_hi << 8) + query->nns_lo, | |
| 865 (query->nar_hi << 8) + query->nar_lo); | |
| 866 | |
| 867 if (!(flags & 0x8000)) { | |
| 868 ngx_log_error(r->log_level, r->log, 0, | |
| 869 "invalid DNS response %d fl:%04Xud", ident, flags); | |
| 870 return; | |
| 871 } | |
| 872 | |
| 873 code = flags & 0x7f; | |
| 874 | |
| 875 if (code == NGX_RESOLVE_FORMERR || code > NGX_RESOLVE_REFUSED) { | |
| 876 ngx_log_error(r->log_level, r->log, 0, | |
| 877 "DNS error (%d: %s), query id:%d", | |
| 878 code, ngx_resolver_strerror(code), ident); | |
| 879 return; | |
| 880 } | |
| 881 | |
| 882 if (nqs != 1) { | |
| 883 err = "invalid number of questions in DNS response"; | |
| 884 goto done; | |
| 885 } | |
| 886 | |
| 887 if (code == 0 && nan == 0) { | |
| 888 err = "no answers in DNS response"; | |
| 889 goto done; | |
| 890 } | |
| 891 | |
| 892 i = sizeof(ngx_resolver_query_t); | |
| 893 | |
| 894 while (i < (ngx_uint_t) n) { | |
| 895 if (buf[i] == '\0') { | |
| 896 goto found; | |
| 897 } | |
| 898 | |
| 899 len = buf[i]; | |
| 900 i += 1 + len; | |
| 901 } | |
| 902 | |
| 903 goto short_response; | |
| 904 | |
| 905 found: | |
| 906 | |
| 907 if (i++ == 0) { | |
| 908 err = "zero-length domain name in DNS response"; | |
| 909 goto done; | |
| 910 } | |
| 911 | |
| 912 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t)) | |
| 913 > (ngx_uint_t) n) | |
| 914 { | |
| 915 goto short_response; | |
| 916 } | |
| 917 | |
| 918 qs = (ngx_resolver_qs_t *) &buf[i]; | |
| 919 | |
| 920 qtype = (qs->type_hi << 8) + qs->type_lo; | |
| 921 qclass = (qs->class_hi << 8) + qs->class_lo; | |
| 922 | |
| 923 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 924 "resolver DNS response qt:%d cl:%d", qtype, qclass); | |
| 925 | |
| 926 if (qclass != 1) { | |
| 927 ngx_log_error(r->log_level, r->log, 0, | |
| 928 "unknown query class %d in DNS response", qclass); | |
| 929 return; | |
| 930 } | |
| 931 | |
| 932 switch (qtype) { | |
| 933 | |
| 934 case NGX_RESOLVE_A: | |
| 935 | |
| 936 ngx_resolver_process_a(r, buf, n, ident, code, nan, | |
| 937 i + sizeof(ngx_resolver_qs_t)); | |
| 938 | |
| 939 break; | |
| 940 | |
| 941 case NGX_RESOLVE_PTR: | |
| 942 | |
| 943 ngx_resolver_process_ptr(r, buf, n, ident, code); | |
| 944 | |
| 945 break; | |
| 946 | |
| 947 default: | |
| 948 ngx_log_error(r->log_level, r->log, 0, | |
| 949 "unknown query type %d in DNS response", qtype); | |
| 950 return; | |
| 951 } | |
| 952 | |
| 953 return; | |
| 954 | |
| 955 short_response: | |
| 956 | |
| 957 err = "short dns response"; | |
| 958 | |
| 959 done: | |
| 960 | |
| 961 ngx_log_error(r->log_level, r->log, 0, err); | |
| 962 | |
| 963 return; | |
| 964 } | |
| 965 | |
| 966 | |
| 967 static void | |
| 968 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last, | |
| 969 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans) | |
| 583 | 970 { |
| 1649 | 971 char *err; |
| 972 u_char *cname; | |
| 973 size_t len; | |
| 974 uint32_t hash; | |
| 975 in_addr_t addr, *addrs; | |
| 976 ngx_str_t name; | |
| 977 ngx_uint_t qtype, qident, naddrs, a, i, n, start; | |
| 978 ngx_resolver_an_t *an; | |
| 979 ngx_resolver_ctx_t *ctx, *next; | |
| 980 ngx_resolver_node_t *rn; | |
| 981 | |
| 982 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) { | |
| 983 return; | |
| 984 } | |
| 985 | |
| 986 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); | |
| 987 | |
| 988 hash = ngx_crc32_short(name.data, name.len); | |
| 989 | |
| 990 /* lock name mutex */ | |
| 991 | |
| 992 rn = ngx_resolver_lookup_name(r, &name, hash); | |
| 993 | |
| 994 if (rn == NULL || rn->query == NULL) { | |
| 995 ngx_log_error(r->log_level, r->log, 0, | |
| 996 "unexpected response for %V", &name); | |
| 997 goto failed; | |
| 998 } | |
| 999 | |
| 1000 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 1001 | |
| 1002 if (ident != qident) { | |
| 1003 ngx_log_error(r->log_level, r->log, 0, | |
| 1004 "wrong ident %d response for %V, expect %d", | |
| 1005 ident, &name, qident); | |
| 1006 goto failed; | |
| 1007 } | |
| 1008 | |
| 1009 if (code) { | |
| 1010 next = rn->waiting; | |
| 1011 rn->waiting = NULL; | |
| 1012 | |
| 1013 ngx_queue_remove(&rn->queue); | |
| 1014 | |
| 1015 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 1016 | |
| 1017 ngx_resolver_free_node(r, rn); | |
| 1018 | |
| 1019 /* unlock name mutex */ | |
| 1020 | |
| 1021 while (next) { | |
| 1022 ctx = next; | |
| 1023 ctx->state = code; | |
| 1024 next = ctx->next; | |
| 1025 | |
| 1026 ctx->handler(ctx); | |
| 1027 } | |
| 1028 | |
| 1029 return; | |
| 1030 } | |
| 1031 | |
| 1032 i = ans; | |
| 1033 naddrs = 0; | |
| 1034 addr = 0; | |
| 1035 addrs = NULL; | |
| 1036 cname = NULL; | |
| 1037 qtype = 0; | |
| 1038 | |
| 1039 for (a = 0; a < nan; a++) { | |
| 1040 | |
| 1041 start = i; | |
| 1042 | |
| 1043 while (i < last) { | |
| 1044 | |
| 1045 if (buf[i] & 0xc0) { | |
| 1046 i += 2; | |
| 1047 goto found; | |
| 1048 } | |
| 1049 | |
| 1050 if (buf[i] == 0) { | |
| 1051 i++; | |
| 1052 goto test_length; | |
| 1053 } | |
| 1054 | |
| 1055 i += 1 + buf[i]; | |
| 1056 } | |
| 1057 | |
| 1058 goto short_response; | |
| 1059 | |
| 1060 test_length: | |
| 1061 | |
| 1062 if (i - start < 2) { | |
| 1063 err = "invalid name in dns response"; | |
| 1064 goto invalid; | |
| 1065 } | |
| 1066 | |
| 1067 found: | |
| 1068 | |
| 1069 if (i + sizeof(ngx_resolver_an_t) >= last) { | |
| 1070 goto short_response; | |
| 1071 } | |
| 1072 | |
| 1073 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1074 | |
| 1075 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1076 len = (an->len_hi << 8) + an->len_lo; | |
| 1077 | |
| 1078 if (qtype == NGX_RESOLVE_A) { | |
| 1079 | |
| 1080 i += sizeof(ngx_resolver_an_t); | |
| 1081 | |
| 1082 if (i + len > last) { | |
| 1083 goto short_response; | |
| 1084 } | |
| 1085 | |
| 1086 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1087 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1088 | |
| 1089 naddrs++; | |
| 1090 | |
| 1091 i += len; | |
| 1092 | |
| 1093 } else if (qtype == NGX_RESOLVE_CNAME) { | |
| 1094 cname = &buf[i] + sizeof(ngx_resolver_an_t); | |
| 1095 i += sizeof(ngx_resolver_an_t) + len; | |
| 1096 } | |
| 1097 } | |
| 1098 | |
| 1099 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1100 "resolver naddrs:%ui cname:%p", naddrs, cname); | |
| 1101 | |
| 1102 if (naddrs) { | |
| 1103 | |
| 1104 if (naddrs == 1) { | |
| 1105 rn->u.addr = addr; | |
| 1106 | |
| 1107 } else { | |
| 1108 | |
| 1109 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t)); | |
| 1110 if (addrs == NULL) { | |
| 1111 return; | |
| 1112 } | |
| 1113 | |
| 1114 n = 0; | |
| 1115 i = ans; | |
| 1116 | |
| 1117 for (a = 0; a < nan; a++) { | |
| 1118 | |
| 1119 for ( ;; ) { | |
| 1120 | |
| 1121 if (buf[i] & 0xc0) { | |
| 1122 i += 2; | |
| 1123 goto ok; | |
| 1124 } | |
| 1125 | |
| 1126 if (buf[i] == 0) { | |
| 1127 i++; | |
| 1128 goto ok; | |
| 1129 } | |
| 1130 | |
| 1131 i += 1 + buf[i]; | |
| 1132 } | |
| 1133 | |
| 1134 ok: | |
| 1135 | |
| 1136 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1137 | |
| 1138 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1139 len = (an->len_hi << 8) + an->len_lo; | |
| 1140 | |
| 1141 i += sizeof(ngx_resolver_an_t); | |
| 1142 | |
| 1143 if (qtype == NGX_RESOLVE_A) { | |
| 1144 | |
| 1145 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1146 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1147 | |
| 1148 if (n == naddrs) { | |
| 1149 break; | |
| 1150 } | |
| 1151 } | |
| 1152 | |
| 1153 i += len; | |
| 1154 } | |
| 1155 | |
| 1156 rn->u.addrs = addrs; | |
| 1157 | |
| 1158 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
| 1159 naddrs * sizeof(in_addr_t)); | |
| 1160 if (addrs == NULL) { | |
| 1161 return; | |
| 1162 } | |
| 1163 } | |
| 1164 | |
| 1165 rn->naddrs = (u_short) naddrs; | |
| 1166 | |
| 1167 ngx_queue_remove(&rn->queue); | |
| 1168 | |
| 1169 rn->valid = ngx_time() + r->valid; | |
| 1170 rn->expire = ngx_time() + r->expire; | |
| 1171 | |
| 1172 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1173 | |
| 1174 next = rn->waiting; | |
| 1175 rn->waiting = NULL; | |
| 1176 | |
| 1177 /* unlock name mutex */ | |
| 1178 | |
| 1179 while (next) { | |
| 1180 ctx = next; | |
| 1181 ctx->state = NGX_OK; | |
| 1182 ctx->naddrs = naddrs; | |
| 1183 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 1184 ctx->addr = addr; | |
| 1185 next = ctx->next; | |
| 1186 | |
| 1187 ctx->handler(ctx); | |
| 1188 } | |
| 1189 | |
| 1190 if (naddrs) { | |
| 1191 ngx_resolver_free(r, addrs); | |
| 1192 } | |
| 1193 | |
| 1194 return; | |
| 1195 | |
| 1196 } else if (cname) { | |
| 1197 | |
| 1198 /* CNAME only */ | |
| 1199 | |
| 1200 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) { | |
| 1201 return; | |
| 1202 } | |
| 1203 | |
| 1204 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1205 "resolver cname:\"%V\"", &name); | |
| 1206 | |
| 1207 rn->cnlen = (u_short) name.len; | |
| 1208 rn->u.cname = name.data; | |
| 1209 rn->valid = ngx_time() + r->valid; | |
| 1210 rn->expire = ngx_time() + r->expire; | |
| 1211 | |
| 1212 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1213 | |
| 1214 ctx = rn->waiting; | |
| 1215 rn->waiting = NULL; | |
| 1216 | |
| 1217 if (ctx) { | |
| 1218 ctx->name = name; | |
| 1219 | |
| 1220 (void) ngx_resolve_name_locked(r, ctx); | |
| 1221 } | |
| 1222 | |
| 1223 return; | |
| 1224 } | |
| 1225 | |
| 1226 ngx_log_error(r->log_level, r->log, 0, | |
| 1227 "no A or CNAME types in DNS responses, unknown query type: %d", | |
| 1228 qtype); | |
| 1229 return; | |
| 1230 | |
| 1231 short_response: | |
| 1232 | |
| 1233 err = "short dns response"; | |
| 1234 | |
| 1235 invalid: | |
| 1236 | |
| 1237 /* unlock name mutex */ | |
| 1238 | |
| 1239 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1240 | |
| 1241 return; | |
| 1242 | |
| 1243 failed: | |
| 1244 | |
| 1245 /* unlock name mutex */ | |
| 1246 | |
| 1247 return; | |
| 1248 } | |
| 1249 | |
| 1250 | |
| 1251 static void | |
| 1252 ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, | |
| 1253 ngx_uint_t ident, ngx_uint_t code) | |
| 1254 { | |
| 1255 char *err; | |
| 1256 size_t len; | |
| 1257 in_addr_t addr; | |
| 1258 ngx_int_t digit; | |
| 1259 ngx_str_t name; | |
| 1260 ngx_uint_t i, mask, qtype, qclass, qident; | |
| 1261 ngx_resolver_an_t *an; | |
| 1262 ngx_resolver_ctx_t *ctx, *next; | |
| 1263 ngx_resolver_node_t *rn; | |
| 1264 | |
| 1265 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) { | |
| 1266 goto invalid_in_addr_arpa; | |
| 1267 } | |
| 1268 | |
| 1269 addr = 0; | |
| 1270 i = 12; | |
| 1271 | |
| 1272 for (mask = 0; mask < 32; mask += 8) { | |
| 1273 len = buf[i++]; | |
| 1274 | |
| 1275 digit = ngx_atoi(&buf[i], len); | |
| 1276 if (digit == NGX_ERROR || digit > 255) { | |
| 1277 goto invalid_in_addr_arpa; | |
| 1278 } | |
| 1279 | |
| 1280 addr += digit << mask; | |
| 1281 i += len; | |
| 1282 } | |
| 1283 | |
| 1284 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) { | |
| 1285 goto invalid_in_addr_arpa; | |
| 1286 } | |
| 1287 | |
| 1288 /* lock addr mutex */ | |
| 1289 | |
| 1290 rn = ngx_resolver_lookup_addr(r, addr); | |
| 1291 | |
| 1292 if (rn == NULL || rn->query == NULL) { | |
| 1293 ngx_log_error(r->log_level, r->log, 0, | |
| 1294 "unexpected response for %ud.%ud.%ud.%ud", | |
| 1295 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 1296 (addr >> 8) & 0xff, addr & 0xff); | |
| 1297 goto failed; | |
| 1298 } | |
| 1299 | |
| 1300 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 1301 | |
| 1302 if (ident != qident) { | |
| 1303 ngx_log_error(r->log_level, r->log, 0, | |
| 1304 "wrong ident %d response for %ud.%ud.%ud.%ud, expect %d", | |
| 1305 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 1306 (addr >> 8) & 0xff, addr & 0xff, qident); | |
| 1307 goto failed; | |
| 1308 } | |
| 1309 | |
| 1310 if (code) { | |
| 1311 next = rn->waiting; | |
| 1312 rn->waiting = NULL; | |
| 1313 | |
| 1314 ngx_queue_remove(&rn->queue); | |
| 1315 | |
| 1316 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 1317 | |
| 1318 ngx_resolver_free_node(r, rn); | |
| 1319 | |
| 1320 /* unlock addr mutex */ | |
| 1321 | |
| 1322 while (next) { | |
| 1323 ctx = next; | |
| 1324 ctx->state = code; | |
| 1325 next = ctx->next; | |
| 1326 | |
| 1327 ctx->handler(ctx); | |
| 1328 } | |
| 1329 | |
| 1330 return; | |
| 1331 } | |
| 1332 | |
| 1333 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t); | |
| 1334 | |
| 1335 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) { | |
| 1336 goto short_response; | |
| 1337 } | |
| 1338 | |
| 1339 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */ | |
| 1340 | |
| 1341 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) { | |
| 1342 err = "invalid in-addr.arpa name in DNS response"; | |
| 1343 goto invalid; | |
| 1344 } | |
| 1345 | |
| 1346 an = (ngx_resolver_an_t *) &buf[i + 2]; | |
| 1347 | |
| 1348 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1349 qclass = (an->class_hi << 8) + an->class_lo; | |
| 1350 len = (an->len_hi << 8) + an->len_lo; | |
| 1351 | |
| 1352 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1353 "resolver qt:%d cl:%d len:%uz", qtype, qclass, len); | |
| 1354 | |
| 1355 i += 2 + sizeof(ngx_resolver_an_t); | |
| 1356 | |
| 1357 if (i + len > (ngx_uint_t) n) { | |
| 1358 goto short_response; | |
| 1359 } | |
| 1360 | |
| 1361 len -= 2; | |
| 1362 | |
| 1363 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) { | |
| 1364 return; | |
| 1365 } | |
| 1366 | |
| 1367 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name); | |
| 1368 | |
| 1369 if (len != (size_t) rn->nlen || ngx_strncmp(name.data, rn->name, len) != 0) | |
| 1370 { | |
| 1371 ngx_resolver_free(r, rn->name); | |
| 1372 rn->name = name.data; | |
| 1373 | |
| 1374 name.data = ngx_resolver_dup(r, rn->name, len); | |
| 1375 if (name.data == NULL) { | |
| 1376 goto failed; | |
| 1377 } | |
| 1378 } | |
| 1379 | |
| 1380 ngx_queue_remove(&rn->queue); | |
| 1381 | |
| 1382 rn->valid = ngx_time() + r->valid; | |
| 1383 rn->expire = ngx_time() + r->expire; | |
| 1384 | |
| 1385 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
| 1386 | |
| 1387 next = rn->waiting; | |
| 1388 rn->waiting = NULL; | |
| 1389 | |
| 1390 /* unlock addr mutex */ | |
| 1391 | |
| 1392 while (next) { | |
| 1393 ctx = next; | |
| 1394 ctx->state = NGX_OK; | |
| 1395 ctx->name = name; | |
| 1396 next = ctx->next; | |
| 1397 | |
| 1398 ctx->handler(ctx); | |
| 1399 } | |
| 1400 | |
| 1401 ngx_resolver_free(r, name.data); | |
| 1402 | |
| 1403 return; | |
| 1404 | |
| 1405 invalid_in_addr_arpa: | |
| 1406 | |
| 1407 ngx_log_error(r->log_level, r->log, 0, | |
| 1408 "invalid in-addr.arpa name in DNS response"); | |
| 1409 return; | |
| 1410 | |
| 1411 short_response: | |
| 1412 | |
| 1413 err = "short DNS response"; | |
| 1414 | |
| 1415 invalid: | |
| 1416 | |
| 1417 /* unlock addr mutex */ | |
| 1418 | |
| 1419 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1420 | |
| 1421 return; | |
| 1422 | |
| 1423 failed: | |
| 1424 | |
| 1425 /* unlock addr mutex */ | |
| 1426 | |
| 1427 return; | |
| 1428 } | |
| 1429 | |
| 1430 | |
| 1431 static ngx_resolver_node_t * | |
| 1432 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) | |
| 1433 { | |
| 1434 ngx_int_t rc; | |
| 1435 size_t len; | |
| 1436 ngx_rbtree_node_t *node, *sentinel; | |
| 1437 ngx_resolver_node_t *rn; | |
| 1438 | |
| 1439 node = r->name_rbtree.root; | |
| 1440 sentinel = r->name_rbtree.sentinel; | |
| 1441 | |
| 1442 while (node != sentinel) { | |
| 1443 | |
| 1444 if (hash < node->key) { | |
| 1445 node = node->left; | |
| 1446 continue; | |
| 1447 } | |
| 1448 | |
| 1449 if (hash > node->key) { | |
| 1450 node = node->right; | |
| 1451 continue; | |
| 1452 } | |
| 1453 | |
| 1454 /* hash == node->key */ | |
| 1455 | |
| 1456 do { | |
| 1457 rn = (ngx_resolver_node_t *) node; | |
| 1458 | |
| 1459 len = (name->len > (size_t) rn->nlen) ? rn->nlen : name->len; | |
| 1460 | |
| 1461 rc = ngx_strncmp(name->data, rn->name, len); | |
| 1462 | |
| 1463 if (rc == 0) { | |
| 1464 return rn; | |
| 1465 } | |
| 1466 | |
| 1467 node = (rc < 0) ? node->left : node->right; | |
| 1468 | |
| 1469 } while (node != sentinel && hash == node->key); | |
| 1470 | |
| 1471 break; | |
| 1472 } | |
| 1473 | |
| 1474 /* not found */ | |
| 1475 | |
| 1476 return NULL; | |
| 1477 } | |
| 1478 | |
| 1479 | |
| 1480 static ngx_resolver_node_t * | |
| 1481 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr) | |
| 1482 { | |
| 1483 ngx_rbtree_node_t *node, *sentinel; | |
| 1484 | |
| 1485 node = r->addr_rbtree.root; | |
| 1486 sentinel = r->addr_rbtree.sentinel; | |
| 1487 | |
| 1488 while (node != sentinel) { | |
| 1489 | |
| 1490 if (addr < node->key) { | |
| 1491 node = node->left; | |
| 1492 continue; | |
| 1493 } | |
| 1494 | |
| 1495 if (addr > node->key) { | |
| 1496 node = node->right; | |
| 1497 continue; | |
| 1498 } | |
| 1499 | |
| 1500 /* addr == node->key */ | |
| 1501 | |
| 1502 return (ngx_resolver_node_t *) node; | |
| 1503 } | |
| 1504 | |
| 1505 /* not found */ | |
| 1506 | |
| 1507 return NULL; | |
| 1508 } | |
| 1509 | |
| 1510 | |
| 1511 static void | |
| 1512 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
| 1513 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
| 1514 { | |
| 1515 size_t len; | |
| 1516 ngx_rbtree_node_t **p; | |
| 1517 ngx_resolver_node_t *rn, *rn_temp; | |
| 1518 | |
| 1519 for ( ;; ) { | |
| 1520 | |
| 1521 if (node->key < temp->key) { | |
| 1522 | |
| 1523 p = &temp->left; | |
| 1524 | |
| 1525 } else if (node->key > temp->key) { | |
| 1526 | |
| 1527 p = &temp->right; | |
| 1528 | |
| 1529 } else { /* node->key == temp->key */ | |
| 1530 | |
| 1531 rn = (ngx_resolver_node_t *) node; | |
| 1532 rn_temp = (ngx_resolver_node_t *) temp; | |
| 1533 | |
| 1534 len = (rn->nlen > rn_temp->nlen) ? rn_temp->nlen : rn->nlen; | |
| 1535 | |
| 1536 p = (ngx_strncmp(rn->name, rn_temp->name, len) < 0) | |
| 1537 ? &temp->left : &temp->right; | |
| 1538 } | |
| 1539 | |
| 1540 if (*p == sentinel) { | |
| 1541 break; | |
| 1542 } | |
| 1543 | |
| 1544 temp = *p; | |
| 1545 } | |
| 1546 | |
| 1547 *p = node; | |
| 1548 node->parent = temp; | |
| 1549 node->left = sentinel; | |
| 1550 node->right = sentinel; | |
| 1551 ngx_rbt_red(node); | |
| 1552 } | |
| 1553 | |
| 1554 | |
| 1555 static ngx_int_t | |
| 1556 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1557 { | |
| 1558 u_char *p, *s; | |
| 1559 size_t len; | |
| 1560 ngx_uint_t ident; | |
| 1561 ngx_resolver_qs_t *qs; | |
| 1562 ngx_resolver_query_t *query; | |
| 1563 | |
| 1564 len = sizeof(ngx_resolver_query_t) | |
| 1565 + 1 + ctx->name.len + 1 + sizeof(ngx_resolver_qs_t); | |
| 1566 | |
| 1567 p = ngx_resolver_calloc(ctx->resolver, len); | |
| 1568 if (p == NULL) { | |
| 1569 return NGX_ERROR; | |
| 1570 } | |
| 1571 | |
| 1572 rn->qlen = (u_short) len; | |
| 1573 rn->query = p; | |
| 1574 | |
| 1575 query = (ngx_resolver_query_t *) p; | |
| 1576 | |
| 1577 ident = ngx_random(); | |
| 1578 | |
| 1579 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0, | |
| 1580 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff); | |
| 1581 | |
| 1582 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1583 query->ident_lo = (u_char) (ident & 0xff); | |
| 1584 | |
| 1585 /* recursion query */ | |
| 1586 query->flags_hi = 1; query->flags_lo = 0; | |
| 1587 | |
| 1588 /* one question */ | |
| 1589 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1590 query->nan_hi = 0; query->nan_lo = 0; | |
| 1591 query->nns_hi = 0; query->nns_lo = 0; | |
| 1592 query->nar_hi = 0; query->nar_lo = 0; | |
| 1593 | |
| 1594 p += sizeof(ngx_resolver_query_t) + 1 + ctx->name.len + 1; | |
| 1595 | |
| 1596 qs = (ngx_resolver_qs_t *) p; | |
| 1597 | |
| 1598 /* query type */ | |
| 1599 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type; | |
| 1600 | |
| 1601 /* IP query class */ | |
| 1602 qs->class_hi = 0; qs->class_lo = 1; | |
| 1603 | |
| 1604 /* convert "www.example.com" to "\3www\7example\3com\0" */ | |
| 1605 | |
| 1606 len = 0; | |
| 1607 p--; | |
| 1608 *p-- = '\0'; | |
| 1609 | |
| 1610 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) { | |
| 1611 if (*s != '.') { | |
| 1612 *p = *s; | |
| 1613 len++; | |
| 1614 | |
| 1615 } else { | |
| 1616 *p = (u_char) len; | |
| 1617 len = 0; | |
| 1618 } | |
| 1619 | |
| 1620 p--; | |
| 1621 } | |
| 1622 | |
| 1623 *p = (u_char) len; | |
| 1624 | |
| 1625 return NGX_OK; | |
| 1626 } | |
| 1627 | |
| 1628 | |
| 1629 /* AF_INET only */ | |
| 1630 | |
| 1631 static ngx_int_t | |
| 1632 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1633 { | |
| 1634 u_char *p, *d; | |
| 1635 size_t len; | |
| 1636 ngx_int_t n; | |
| 1637 ngx_uint_t ident; | |
| 1638 ngx_resolver_query_t *query; | |
| 1639 | |
| 1640 len = sizeof(ngx_resolver_query_t) | |
| 1641 + sizeof(".255.255.255.255.in-addr.arpa.") - 1 | |
| 1642 + sizeof(ngx_resolver_qs_t); | |
| 1643 | |
| 1644 p = ngx_resolver_calloc(ctx->resolver, len); | |
| 1645 if (p == NULL) { | |
| 1646 return NGX_ERROR; | |
| 1647 } | |
| 1648 | |
| 1649 rn->query = p; | |
| 1650 query = (ngx_resolver_query_t *) p; | |
| 1651 | |
| 1652 ident = ngx_random(); | |
| 1653 | |
| 1654 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1655 query->ident_lo = (u_char) (ident & 0xff); | |
| 1656 | |
| 1657 /* recursion query */ | |
| 1658 query->flags_hi = 1; query->flags_lo = 0; | |
| 1659 | |
| 1660 /* one question */ | |
| 1661 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1662 query->nan_hi = 0; query->nan_lo = 0; | |
| 1663 query->nns_hi = 0; query->nns_lo = 0; | |
| 1664 query->nar_hi = 0; query->nar_lo = 0; | |
| 1665 | |
| 1666 p += sizeof(ngx_resolver_query_t); | |
| 1667 | |
| 1668 for (n = 0; n < 32; n += 8){ | |
| 1669 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff); | |
| 1670 *p = (u_char) (d - &p[1]); | |
| 1671 p = d; | |
| 1672 } | |
| 1673 | |
| 1674 /* query type "PTR", IP query class */ | |
| 1675 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18); | |
| 1676 | |
| 1677 rn->qlen = (u_short) | |
| 1678 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t) | |
| 1679 - rn->query); | |
| 1680 | |
| 1681 return NGX_OK; | |
| 1682 } | |
| 1683 | |
| 1684 | |
| 1685 static ngx_int_t | |
| 1686 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src, | |
| 1687 u_char *last) | |
| 1688 { | |
| 1689 char *err; | |
| 1690 u_char *p, *dst; | |
| 1691 ssize_t len; | |
| 1692 ngx_uint_t i, n; | |
| 1693 | |
| 1694 p = src; | |
| 1695 len = -1; | |
| 1696 | |
| 1697 /* | |
| 1698 * compression pointers allow to create endless loop, so we set limit; | |
| 1699 * 128 pointers should be enough to store 255-byte name | |
| 1700 */ | |
| 1701 | |
| 1702 for (i = 0; i < 128; i++) { | |
| 1703 n = *p++; | |
| 1704 | |
| 1705 if (n == 0) { | |
| 1706 goto done; | |
| 1707 } | |
| 1708 | |
| 1709 if (n & 0xc0) { | |
| 1710 n = (n & 0x3f << 8) + *p; | |
| 1711 p = &buf[n]; | |
| 1712 | |
| 1713 } else { | |
| 1714 len += 1 + n; | |
| 1715 p = &p[n]; | |
| 1716 } | |
| 1717 | |
| 1718 if (p >= last) { | |
| 1719 err = "name is out of response"; | |
| 1720 goto invalid; | |
| 1721 } | |
| 1722 } | |
| 1723 | |
| 1724 err = "compression pointers loop"; | |
| 1725 | |
| 1726 invalid: | |
| 1727 | |
| 1728 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1729 | |
| 1730 return NGX_ERROR; | |
| 1731 | |
| 1732 done: | |
| 1733 | |
| 1734 if (name == NULL) { | |
| 583 | 1735 return NGX_OK; |
| 1736 } | |
| 1737 | |
| 1649 | 1738 dst = ngx_resolver_alloc(r, len); |
| 1739 if (dst == NULL) { | |
| 1740 return NGX_ERROR; | |
| 1741 } | |
| 1742 | |
| 1743 name->data = dst; | |
| 1744 | |
| 1745 n = *src++; | |
| 1746 | |
| 1747 for ( ;; ) { | |
| 1748 if (n != 0xc0) { | |
| 1749 ngx_memcpy(dst, src, n); | |
| 1750 dst += n; | |
| 1751 src += n; | |
| 1752 | |
| 1753 n = *src++; | |
| 1754 | |
| 1755 if (n != 0) { | |
| 1756 *dst++ = '.'; | |
| 1757 } | |
| 1758 | |
| 1759 } else { | |
| 1760 n = (n & 0x3f << 8) + *src; | |
| 1761 src = &buf[n]; | |
| 1762 | |
| 1763 n = *src++; | |
| 1764 } | |
| 1765 | |
| 1766 if (n == 0) { | |
| 1767 name->len = dst - name->data; | |
| 1768 return NGX_OK; | |
| 1769 } | |
| 1770 } | |
| 1771 } | |
| 1772 | |
| 1773 | |
| 1774 static void | |
| 1775 ngx_resolver_timeout_handler(ngx_event_t *ev) | |
| 1776 { | |
| 1777 ngx_resolver_ctx_t *ctx; | |
| 1778 | |
| 1779 ctx = ev->data; | |
| 1780 | |
| 1781 ctx->state = NGX_RESOLVE_TIMEDOUT; | |
| 1782 | |
| 1783 ctx->handler(ctx); | |
| 1784 } | |
| 1785 | |
| 1786 | |
| 1787 static void | |
| 1788 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 1789 { | |
| 1790 /* lock alloc mutex */ | |
| 1791 | |
| 1792 if (rn->query) { | |
| 1793 ngx_resolver_free_locked(r, rn->query); | |
| 1794 } | |
| 1795 | |
| 1796 if (rn->name) { | |
| 1797 ngx_resolver_free_locked(r, rn->name); | |
| 1798 } | |
| 1799 | |
| 1800 if (rn->cnlen) { | |
| 1801 ngx_resolver_free_locked(r, rn->u.cname); | |
| 1802 } | |
| 1803 | |
| 1804 if (rn->naddrs > 1) { | |
| 1805 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 1806 } | |
| 1807 | |
| 1808 ngx_resolver_free_locked(r, rn); | |
| 1809 | |
| 1810 /* unlock alloc mutex */ | |
| 1811 } | |
| 1812 | |
| 1813 | |
| 1814 static void * | |
| 1815 ngx_resolver_alloc(ngx_resolver_t *r, size_t size) | |
| 1816 { | |
| 1817 u_char *p; | |
| 1818 | |
| 1819 /* lock alloc mutex */ | |
| 1820 | |
| 1821 p = ngx_alloc(size, r->log); | |
| 1822 | |
| 1823 /* unlock alloc mutex */ | |
| 1824 | |
| 1825 return p; | |
| 1826 } | |
| 1827 | |
| 1828 | |
| 1829 void * | |
| 1830 ngx_resolver_calloc(ngx_resolver_t *r, size_t size) | |
| 1831 { | |
| 1832 u_char *p; | |
| 1833 | |
| 1834 p = ngx_resolver_alloc(r, size); | |
| 1835 | |
| 1836 if (p) { | |
| 1837 ngx_memzero(p, size); | |
| 1838 } | |
| 1839 | |
| 1840 return p; | |
| 1841 } | |
| 1842 | |
| 1843 | |
| 1844 static void | |
| 1845 ngx_resolver_free(ngx_resolver_t *r, void *p) | |
| 1846 { | |
| 1847 /* lock alloc mutex */ | |
| 1848 | |
| 1849 ngx_free(p); | |
| 1850 | |
| 1851 /* unlock alloc mutex */ | |
| 1852 } | |
| 1853 | |
| 1854 | |
| 1855 static void | |
| 1856 ngx_resolver_free_locked(ngx_resolver_t *r, void *p) | |
| 1857 { | |
| 1858 ngx_free(p); | |
| 1859 } | |
| 1860 | |
| 1861 | |
| 1862 static void * | |
| 1863 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size) | |
| 1864 { | |
| 1865 void *dst; | |
| 1866 | |
| 1867 dst = ngx_resolver_alloc(r, size); | |
| 1868 | |
| 1869 if (dst == NULL) { | |
| 1870 return dst; | |
| 1871 } | |
| 1872 | |
| 1873 ngx_memcpy(dst, src, size); | |
| 1874 | |
| 1875 return dst; | |
| 1876 } | |
| 1877 | |
| 1878 | |
| 1879 char * | |
| 1880 ngx_resolver_strerror(ngx_int_t err) | |
| 1881 { | |
| 1882 static char *errors[] = { | |
| 1883 "Format error", /* FORMERR */ | |
| 1884 "Server failure", /* SERVFAIL */ | |
| 1885 "Host not found", /* NXDOMAIN */ | |
| 1886 "Unimplemented", /* NOTIMP */ | |
| 1887 "Operation refused" /* REFUSED */ | |
| 1888 }; | |
| 1889 | |
| 1890 if (err > 0 && err < 6) { | |
| 1891 return errors[err - 1]; | |
| 1892 } | |
| 1893 | |
| 1894 if (err == NGX_RESOLVE_TIMEDOUT) { | |
| 1895 return "Operation timed out"; | |
| 1896 } | |
| 1897 | |
| 1898 return "Unknown error"; | |
| 1899 } | |
| 1900 | |
| 1901 | |
| 1902 ngx_int_t | |
| 1903 ngx_udp_connect(ngx_udp_connection_t *uc) | |
| 1904 { | |
| 1905 int rc; | |
| 1906 ngx_int_t event; | |
| 1907 ngx_event_t *rev, *wev; | |
| 1908 ngx_socket_t s; | |
| 1909 ngx_connection_t *c; | |
| 1910 | |
| 583 | 1911 s = ngx_socket(AF_INET, SOCK_DGRAM, 0); |
| 1912 | |
| 1649 | 1913 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, uc->log, 0, "UDP socket %d", s); |
| 583 | 1914 |
| 1915 if (s == -1) { | |
| 1649 | 1916 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
| 583 | 1917 ngx_socket_n " failed"); |
| 1918 return NGX_ERROR; | |
| 1919 } | |
| 1920 | |
| 1649 | 1921 c = ngx_get_connection(s, uc->log); |
| 583 | 1922 |
| 1923 if (c == NULL) { | |
| 1924 if (ngx_close_socket(s) == -1) { | |
| 1649 | 1925 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
| 583 | 1926 ngx_close_socket_n "failed"); |
| 1927 } | |
| 1928 | |
| 1929 return NGX_ERROR; | |
| 1930 } | |
| 1931 | |
| 1649 | 1932 if (ngx_nonblocking(s) == -1) { |
| 1933 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
| 1934 ngx_nonblocking_n " failed"); | |
| 1935 | |
| 1936 ngx_free_connection(c); | |
| 1937 | |
| 1938 if (ngx_close_socket(s) == -1) { | |
| 1939 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
| 1940 ngx_close_socket_n " failed"); | |
| 1941 } | |
| 1942 | |
| 1943 return NGX_ERROR; | |
| 1944 } | |
| 1945 | |
| 583 | 1946 rev = c->read; |
| 1947 wev = c->write; | |
| 1948 | |
| 1649 | 1949 rev->log = uc->log; |
| 1950 wev->log = uc->log; | |
| 1951 | |
| 1952 uc->connection = c; | |
| 583 | 1953 |
| 1954 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); | |
| 1955 | |
| 1956 #if (NGX_THREADS) | |
| 1649 | 1957 |
| 1958 /* TODO: lock event when call completion handler */ | |
| 1959 | |
| 1960 rev->lock = &c->lock; | |
| 1961 wev->lock = &c->lock; | |
| 583 | 1962 rev->own_lock = &c->lock; |
| 1963 wev->own_lock = &c->lock; | |
| 1649 | 1964 |
| 583 | 1965 #endif |
| 1966 | |
| 1649 | 1967 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, uc->log, 0, |
| 1968 "connect to %V, fd:%d #%d", &uc->server, s, c->number); | |
| 1969 | |
| 1970 rc = connect(s, uc->sockaddr, uc->socklen); | |
| 1971 | |
| 1972 /* TODO: aio, iocp */ | |
| 583 | 1973 |
| 1974 if (rc == -1) { | |
| 1649 | 1975 ngx_log_error(NGX_LOG_CRIT, uc->log, ngx_socket_errno, |
| 1976 "connect() to %V failed", &uc->server); | |
| 583 | 1977 |
| 1978 return NGX_ERROR; | |
| 1979 } | |
| 1980 | |
| 1649 | 1981 /* UDP sockets are always ready to write */ |
| 1982 wev->ready = 1; | |
| 1983 | |
| 1984 if (ngx_add_event) { | |
| 1985 | |
| 1986 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ? | |
| 1987 /* kqueue, epoll */ NGX_CLEAR_EVENT: | |
| 1988 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT; | |
| 1989 /* eventport event type has no meaning: oneshot only */ | |
| 1990 | |
| 1991 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { | |
| 1992 return NGX_ERROR; | |
| 1993 } | |
| 1994 | |
| 1995 } else { | |
| 1996 /* rtsig */ | |
| 1997 | |
| 583 | 1998 if (ngx_add_conn(c) == NGX_ERROR) { |
| 1999 return NGX_ERROR; | |
| 2000 } | |
| 2001 } | |
| 2002 | |
| 2003 return NGX_OK; | |
| 2004 } |