Mercurial > hg > nginx
annotate src/core/ngx_resolver.c @ 1879:cf4ee321d195
do not delete failed DNS request if there are waiting clients
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Wed, 06 Feb 2008 16:08:52 +0000 |
| parents | 24f9901157ab |
| children | d8de75fe31ec |
| 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, | |
|
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no answers in DNS response should be NXDOMAIN
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changeset
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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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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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parents:
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131 if (addr) { |
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parents:
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132 uc = ngx_calloc(sizeof(ngx_udp_connection_t), log); |
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parents:
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133 if (uc == NULL) { |
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parents:
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134 return NULL; |
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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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135 } |
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1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
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136 |
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1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
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137 r->udp_connection = uc; |
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1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
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138 |
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1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
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139 uc->sockaddr = addr->sockaddr; |
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1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
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140 uc->socklen = addr->socklen; |
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1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
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141 uc->server = addr->name; |
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1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
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142 uc->log = log; |
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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 | |
|
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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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allow to use IP addresses without defined resolver
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parents:
1679
diff
changeset
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171 return NGX_NO_RESOLVER; |
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1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
|
172 } |
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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 /* unlock alloc mutex */ | |
| 221 | |
| 222 return NGX_ERROR; | |
| 223 } | |
| 224 | |
| 225 | |
| 226 void | |
| 227 ngx_resolve_name_done(ngx_resolver_ctx_t *ctx) | |
| 228 { | |
| 229 uint32_t hash; | |
| 230 ngx_resolver_t *r; | |
| 231 ngx_resolver_ctx_t *w, **p; | |
| 232 ngx_resolver_node_t *rn; | |
| 233 | |
| 234 r = ctx->resolver; | |
| 235 | |
| 236 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 237 "resolve name done: %i", ctx->state); | |
| 238 | |
| 239 if (ctx->quick) { | |
| 240 return; | |
| 241 } | |
| 242 | |
| 243 if (ctx->event && ctx->event->timer_set) { | |
| 244 ngx_del_timer(ctx->event); | |
| 245 } | |
| 246 | |
| 247 /* lock name mutex */ | |
| 248 | |
| 249 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
| 250 | |
| 251 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
| 252 | |
| 253 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
| 254 | |
| 255 if (rn) { | |
| 256 p = &rn->waiting; | |
| 257 w = rn->waiting; | |
| 258 | |
| 259 while (w) { | |
| 260 if (w == ctx) { | |
| 261 *p = w->next; | |
| 262 | |
| 263 goto done; | |
| 264 } | |
| 265 | |
| 266 p = &w->next; | |
| 267 w = w->next; | |
| 268 } | |
| 269 } | |
| 270 | |
| 271 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
| 272 "could not cancel %V resolving", &ctx->name); | |
| 273 } | |
| 274 | |
| 275 done: | |
| 276 | |
| 277 ngx_resolver_expire(r, &r->name_rbtree, &r->name_expire_queue); | |
| 278 | |
| 279 /* unlock name mutex */ | |
| 280 | |
| 281 ngx_resolver_free(r, ctx); | |
| 282 } | |
| 283 | |
| 284 | |
| 285 /* NGX_RESOLVE_A only */ | |
| 286 | |
| 287 static ngx_int_t | |
| 288 ngx_resolve_name_locked(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx) | |
| 289 { | |
| 290 uint32_t hash; | |
| 291 in_addr_t addr, *addrs; | |
| 292 ngx_uint_t naddrs; | |
| 293 ngx_resolver_ctx_t *next; | |
| 294 ngx_resolver_node_t *rn; | |
| 295 | |
| 296 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
| 297 | |
| 298 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
| 299 | |
| 300 if (rn) { | |
| 301 | |
| 302 if (rn->valid >= ngx_time()) { | |
| 303 | |
| 304 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
| 305 | |
| 306 ngx_queue_remove(&rn->queue); | |
| 307 | |
| 308 rn->expire = ngx_time() + r->expire; | |
| 309 | |
| 310 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 311 | |
| 312 naddrs = rn->naddrs; | |
| 313 | |
| 314 if (naddrs) { | |
| 315 | |
| 316 /* NGX_RESOLVE_A answer */ | |
| 317 | |
| 318 if (naddrs != 1) { | |
| 319 addr = 0; | |
| 320 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
| 321 naddrs * sizeof(in_addr_t)); | |
| 322 if (addrs == NULL) { | |
| 323 return NGX_ERROR; | |
| 324 } | |
| 325 | |
| 326 } else { | |
| 327 addr = rn->u.addr; | |
| 328 addrs = NULL; | |
| 329 } | |
| 330 | |
| 331 ctx->next = rn->waiting; | |
| 332 rn->waiting = NULL; | |
| 333 | |
| 334 /* unlock name mutex */ | |
| 335 | |
| 336 do { | |
| 337 ctx->state = NGX_OK; | |
| 338 ctx->naddrs = naddrs; | |
| 339 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 340 ctx->addr = addr; | |
| 341 next = ctx->next; | |
| 342 | |
| 343 ctx->handler(ctx); | |
| 344 | |
| 345 ctx = next; | |
| 346 } while (ctx); | |
| 347 | |
| 348 if (addrs) { | |
| 349 ngx_resolver_free(r, addrs); | |
| 350 } | |
| 351 | |
| 352 return NGX_OK; | |
| 353 } | |
| 354 | |
| 355 /* NGX_RESOLVE_CNAME */ | |
| 356 | |
| 357 ctx->name.len = rn->cnlen; | |
| 358 ctx->name.data = rn->u.cname; | |
| 359 | |
| 360 return ngx_resolve_name_locked(r, ctx); | |
| 361 } | |
| 362 | |
| 363 if (rn->waiting) { | |
| 364 | |
| 365 ctx->next = rn->waiting; | |
| 366 rn->waiting = ctx; | |
| 367 | |
| 368 return NGX_AGAIN; | |
| 369 } | |
| 370 | |
| 371 ngx_queue_remove(&rn->queue); | |
| 372 | |
| 373 /* lock alloc mutex */ | |
| 374 | |
| 375 ngx_resolver_free_locked(r, rn->query); | |
| 376 | |
| 377 if (rn->cnlen) { | |
| 378 ngx_resolver_free_locked(r, rn->u.cname); | |
| 379 } | |
| 380 | |
| 381 if (rn->naddrs > 1) { | |
| 382 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 383 } | |
| 384 | |
| 385 /* unlock alloc mutex */ | |
| 386 | |
| 387 } else { | |
| 388 | |
| 389 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
| 390 if (rn == NULL) { | |
| 391 return NGX_ERROR; | |
| 392 } | |
| 393 | |
| 394 rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len); | |
| 395 if (rn->name == NULL) { | |
| 396 ngx_resolver_free(r, rn); | |
| 397 return NGX_ERROR; | |
| 398 } | |
| 399 | |
| 400 rn->node.key = hash; | |
| 401 rn->nlen = (u_short) ctx->name.len; | |
| 402 | |
| 403 ngx_rbtree_insert(&r->name_rbtree, &rn->node); | |
| 404 } | |
| 405 | |
| 406 if (ngx_resolver_create_name_query(rn, ctx) != NGX_OK) { | |
| 407 goto failed; | |
| 408 } | |
| 409 | |
| 410 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
| 411 goto failed; | |
| 412 } | |
| 413 | |
| 414 if (ctx->event == NULL) { | |
| 415 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
| 416 if (ctx->event == NULL) { | |
| 417 goto failed; | |
| 418 } | |
| 419 | |
| 420 ctx->event->handler = ngx_resolver_timeout_handler; | |
| 421 ctx->event->data = ctx; | |
| 422 ctx->event->log = r->log; | |
| 423 ctx->ident = -1; | |
| 424 | |
| 425 ngx_add_timer(ctx->event, ctx->timeout); | |
| 426 } | |
| 427 | |
| 428 if (ngx_queue_empty(&r->name_resend_queue)) { | |
| 429 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
| 430 } | |
| 431 | |
| 432 rn->expire = ngx_time() + r->resend_timeout; | |
| 433 | |
| 434 ngx_queue_insert_head(&r->name_resend_queue, &rn->queue); | |
| 435 | |
| 436 rn->cnlen = 0; | |
| 437 rn->naddrs = 0; | |
| 438 rn->valid = 0; | |
| 439 rn->waiting = ctx; | |
| 440 | |
| 441 ctx->state = NGX_AGAIN; | |
| 442 | |
| 443 return NGX_AGAIN; | |
| 444 | |
| 445 failed: | |
| 446 | |
| 447 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 448 | |
| 449 ngx_resolver_free(r, rn->name); | |
| 450 | |
| 451 ngx_resolver_free(r, rn); | |
| 452 | |
| 453 return NGX_ERROR; | |
| 454 } | |
| 583 | 455 |
| 456 | |
| 457 ngx_int_t | |
| 1649 | 458 ngx_resolve_addr(ngx_resolver_ctx_t *ctx) |
| 459 { | |
| 460 ngx_resolver_t *r; | |
| 461 ngx_resolver_node_t *rn; | |
| 462 | |
| 463 r = ctx->resolver; | |
| 464 | |
| 465 ctx->addr = ntohl(ctx->addr); | |
| 466 | |
| 467 /* lock addr mutex */ | |
| 468 | |
| 469 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
| 470 | |
| 471 if (rn) { | |
| 472 | |
| 473 if (rn->valid >= ngx_time()) { | |
| 474 | |
| 475 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
| 476 | |
| 477 ngx_queue_remove(&rn->queue); | |
| 478 | |
| 479 rn->expire = ngx_time() + r->expire; | |
| 480 | |
| 481 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
| 482 | |
| 483 ctx->name.len = rn->nlen; | |
| 484 ctx->name.data = ngx_resolver_dup(r, rn->name, rn->nlen); | |
| 485 if (ctx->name.data == NULL) { | |
| 486 goto failed; | |
| 487 } | |
| 488 | |
| 489 /* unlock addr mutex */ | |
| 490 | |
| 491 ctx->state = NGX_OK; | |
| 492 | |
| 493 ctx->handler(ctx); | |
| 494 | |
| 495 ngx_resolver_free(r, ctx->name.data); | |
| 496 | |
| 497 return NGX_OK; | |
| 498 } | |
| 499 | |
| 500 if (rn->waiting) { | |
| 501 | |
| 502 ctx->next = rn->waiting; | |
| 503 rn->waiting = ctx; | |
| 504 | |
| 505 return NGX_AGAIN; | |
| 506 } | |
| 507 | |
| 508 ngx_queue_remove(&rn->queue); | |
| 509 | |
| 510 ngx_resolver_free(r, rn->query); | |
| 511 | |
| 512 } else { | |
| 513 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
| 514 if (rn == NULL) { | |
| 515 goto failed; | |
| 516 } | |
| 517 | |
| 518 rn->node.key = ctx->addr; | |
| 519 | |
| 520 ngx_rbtree_insert(&r->addr_rbtree, &rn->node); | |
| 521 } | |
| 522 | |
| 523 if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) { | |
| 524 goto failed; | |
| 525 } | |
| 526 | |
| 527 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
| 528 goto failed; | |
| 529 } | |
| 530 | |
| 531 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
| 532 if (ctx->event == NULL) { | |
| 533 goto failed; | |
| 534 } | |
| 535 | |
| 536 ctx->event->handler = ngx_resolver_timeout_handler; | |
| 537 ctx->event->data = ctx; | |
| 538 ctx->event->log = r->log; | |
| 539 ctx->ident = -1; | |
| 540 | |
| 541 ngx_add_timer(ctx->event, ctx->timeout); | |
| 542 | |
| 543 if (ngx_queue_empty(&r->addr_resend_queue)) { | |
| 544 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
| 545 } | |
| 546 | |
| 547 rn->expire = ngx_time() + r->resend_timeout; | |
| 548 | |
| 549 ngx_queue_insert_head(&r->addr_resend_queue, &rn->queue); | |
| 550 | |
| 551 rn->cnlen = 0; | |
| 552 rn->naddrs = 0; | |
| 553 rn->name = NULL; | |
| 554 rn->nlen = 0; | |
| 555 rn->valid = 0; | |
| 556 rn->waiting = ctx; | |
| 557 | |
| 558 /* unlock addr mutex */ | |
| 559 | |
| 560 ctx->state = NGX_AGAIN; | |
| 561 | |
| 562 return NGX_OK; | |
| 563 | |
| 564 failed: | |
| 565 | |
| 566 if (rn) { | |
| 567 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 568 | |
| 569 ngx_resolver_free(r, rn); | |
| 570 } | |
| 571 | |
| 572 /* unlock addr mutex */ | |
| 573 | |
| 574 /* lock alloc mutex */ | |
| 575 | |
| 576 if (ctx->event) { | |
| 577 ngx_resolver_free_locked(r, ctx->event); | |
| 578 } | |
| 579 | |
| 580 ngx_resolver_free_locked(r, ctx); | |
| 581 | |
| 582 /* unlock alloc mutex */ | |
| 583 | |
| 584 return NGX_ERROR; | |
| 585 } | |
| 586 | |
| 587 | |
| 588 void | |
| 589 ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx) | |
| 590 { | |
| 591 in_addr_t addr; | |
| 592 ngx_resolver_t *r; | |
| 593 ngx_resolver_ctx_t *w, **p; | |
| 594 ngx_resolver_node_t *rn; | |
| 595 | |
| 596 r = ctx->resolver; | |
| 597 | |
| 598 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 599 "resolve addr done: %i", ctx->state); | |
| 600 | |
| 601 if (ctx->event && ctx->event->timer_set) { | |
| 602 ngx_del_timer(ctx->event); | |
| 603 } | |
| 604 | |
| 605 /* lock addr mutex */ | |
| 606 | |
| 607 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
| 608 | |
| 609 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
| 610 | |
| 611 if (rn) { | |
| 612 p = &rn->waiting; | |
| 613 w = rn->waiting; | |
| 614 | |
| 615 while (w) { | |
| 616 if (w == ctx) { | |
| 617 *p = w->next; | |
| 618 | |
| 619 goto done; | |
| 620 } | |
| 621 | |
| 622 p = &w->next; | |
| 623 w = w->next; | |
| 624 } | |
| 625 } | |
| 626 | |
| 627 addr = ntohl(ctx->addr); | |
| 628 | |
| 629 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
| 630 "could not cancel %ud.%ud.%ud.%ud resolving", | |
| 631 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 632 (addr >> 8) & 0xff, addr & 0xff); | |
| 633 } | |
| 634 | |
| 635 done: | |
| 636 | |
| 637 ngx_resolver_expire(r, &r->addr_rbtree, &r->addr_expire_queue); | |
| 638 | |
| 639 /* unlock addr mutex */ | |
| 640 | |
| 641 ngx_resolver_free(r, ctx); | |
| 642 } | |
| 643 | |
| 644 | |
| 645 static void | |
| 646 ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 647 { | |
| 648 time_t now; | |
| 649 ngx_uint_t i; | |
| 650 ngx_queue_t *q; | |
| 651 ngx_resolver_node_t *rn; | |
| 652 | |
| 653 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire"); | |
| 654 | |
| 655 now = ngx_time(); | |
| 656 | |
| 657 for (i = 0; i < 2; i++) { | |
| 658 if (ngx_queue_empty(queue)) { | |
| 659 return; | |
| 660 } | |
| 661 | |
| 662 q = ngx_queue_last(queue); | |
| 663 | |
| 664 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 665 | |
| 666 if (now <= rn->expire) { | |
| 667 return; | |
| 668 } | |
| 669 | |
| 1774 | 670 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, |
| 671 "resolver expire \"%*s\"", (size_t) rn->nlen, rn->name); | |
| 1649 | 672 |
| 673 ngx_queue_remove(q); | |
| 674 | |
| 675 ngx_rbtree_delete(tree, &rn->node); | |
| 676 | |
| 677 ngx_resolver_free_node(r, rn); | |
| 678 } | |
| 679 } | |
| 680 | |
| 681 | |
| 682 static ngx_int_t | |
| 683 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 684 { | |
| 685 ssize_t n; | |
| 686 ngx_udp_connection_t *uc; | |
| 687 | |
| 688 uc = r->udp_connection; | |
| 689 | |
| 690 if (uc->connection == NULL) { | |
| 691 if (ngx_udp_connect(uc) != NGX_OK) { | |
| 692 return NGX_ERROR; | |
| 693 } | |
| 694 | |
| 695 uc->connection->data = r; | |
| 696 uc->connection->read->handler = ngx_resolver_read_response; | |
| 697 } | |
| 698 | |
| 699 n = ngx_send(uc->connection, rn->query, rn->qlen); | |
| 700 | |
| 701 if (n == -1) { | |
| 702 return NGX_ERROR; | |
| 703 } | |
| 704 | |
| 705 if ((size_t) n != (size_t) rn->qlen) { | |
| 706 ngx_log_error(NGX_LOG_CRIT, uc->log, 0, "send() incomplete"); | |
| 707 return NGX_ERROR; | |
| 708 } | |
| 709 | |
| 710 return NGX_OK; | |
| 711 } | |
| 712 | |
| 713 | |
| 714 static void | |
| 715 ngx_resolver_resend_handler(ngx_event_t *ev) | |
| 716 { | |
| 717 time_t timer, atimer, ntimer; | |
| 718 ngx_resolver_t *r; | |
| 719 | |
| 720 r = ev->data; | |
| 721 | |
| 722 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 723 "resolver resend handler"); | |
| 724 | |
| 725 /* lock name mutex */ | |
| 726 | |
| 727 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue); | |
| 728 | |
| 729 /* unlock name mutex */ | |
| 730 | |
| 731 /* lock addr mutex */ | |
| 732 | |
| 733 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
|
734 |
| 1649 | 735 /* unlock addr mutex */ |
| 736 | |
| 737 if (ntimer == 0) { | |
| 738 timer = atimer; | |
| 739 | |
| 740 } else if (atimer == 0) { | |
| 741 timer = ntimer; | |
| 742 | |
| 743 } else { | |
| 744 timer = (atimer < ntimer) ? atimer : ntimer; | |
| 745 } | |
| 746 | |
| 747 if (timer) { | |
| 748 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000)); | |
| 749 } | |
| 750 } | |
| 751 | |
| 752 | |
| 753 static time_t | |
| 754 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 755 { | |
| 756 time_t now; | |
| 757 ngx_queue_t *q; | |
| 758 ngx_resolver_node_t *rn; | |
| 759 | |
| 760 now = ngx_time(); | |
| 761 | |
| 762 for ( ;; ) { | |
| 763 if (ngx_queue_empty(queue)) { | |
| 764 return 0; | |
| 765 } | |
| 766 | |
| 767 q = ngx_queue_last(queue); | |
| 768 | |
| 769 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 770 | |
| 771 if (now < rn->expire) { | |
| 772 return rn->expire - now; | |
| 773 } | |
| 774 | |
| 1774 | 775 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, |
| 776 "resolver resend \"%*s\" %p", | |
| 777 (size_t) rn->nlen, rn->name, rn->waiting); | |
| 1649 | 778 |
| 779 ngx_queue_remove(q); | |
| 780 | |
| 781 if (rn->waiting) { | |
| 782 | |
| 783 if (ngx_resolver_send_query(r, rn) == NGX_OK) { | |
| 784 | |
| 785 rn->expire = now + r->resend_timeout; | |
| 786 | |
| 787 ngx_queue_insert_head(queue, &rn->queue); | |
| 788 } | |
|
1879
cf4ee321d195
do not delete failed DNS request if there are waiting clients
Igor Sysoev <igor@sysoev.ru>
parents:
1878
diff
changeset
|
789 |
|
cf4ee321d195
do not delete failed DNS request if there are waiting clients
Igor Sysoev <igor@sysoev.ru>
parents:
1878
diff
changeset
|
790 continue; |
| 1649 | 791 } |
| 792 | |
| 793 ngx_rbtree_delete(tree, &rn->node); | |
| 794 | |
| 795 ngx_resolver_free_node(r, rn); | |
| 796 } | |
| 797 } | |
| 798 | |
| 799 | |
| 800 static void | |
| 801 ngx_resolver_read_response(ngx_event_t *rev) | |
| 802 { | |
| 803 ssize_t n; | |
| 804 ngx_connection_t *c; | |
| 805 u_char buf[NGX_RESOLVER_UDP_SIZE]; | |
| 806 | |
| 807 c = rev->data; | |
| 808 | |
| 809 do { | |
| 1689 | 810 n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE); |
| 811 | |
| 812 if (n < 0) { | |
| 1649 | 813 return; |
| 814 } | |
| 815 | |
| 816 ngx_resolver_process_response(c->data, buf, n); | |
| 817 | |
| 818 } while (rev->ready); | |
| 819 } | |
| 820 | |
| 821 | |
| 822 static void | |
| 823 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n) | |
| 824 { | |
| 825 char *err; | |
| 826 size_t len; | |
| 827 ngx_uint_t i, ident, flags, code, nqs, nan, qtype, qclass; | |
| 828 ngx_resolver_qs_t *qs; | |
| 829 ngx_resolver_query_t *query; | |
| 830 | |
| 831 if ((size_t) n < sizeof(ngx_resolver_query_t) + 1) { | |
| 832 goto short_response; | |
| 833 } | |
| 834 | |
| 835 query = (ngx_resolver_query_t *) buf; | |
| 836 | |
| 837 ident = (query->ident_hi << 8) + query->ident_lo; | |
| 838 flags = (query->flags_hi << 8) + query->flags_lo; | |
| 839 nqs = (query->nqs_hi << 8) + query->nqs_lo; | |
| 840 nan = (query->nan_hi << 8) + query->nan_lo; | |
| 841 | |
| 842 ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 843 "resolver DNS response %d fl:%04Xud %d/%d/%d/%d", | |
| 844 ident, flags, nqs, nan, | |
| 845 (query->nns_hi << 8) + query->nns_lo, | |
| 846 (query->nar_hi << 8) + query->nar_lo); | |
| 847 | |
| 848 if (!(flags & 0x8000)) { | |
| 849 ngx_log_error(r->log_level, r->log, 0, | |
| 850 "invalid DNS response %d fl:%04Xud", ident, flags); | |
| 851 return; | |
| 852 } | |
| 853 | |
| 854 code = flags & 0x7f; | |
| 855 | |
| 856 if (code == NGX_RESOLVE_FORMERR || code > NGX_RESOLVE_REFUSED) { | |
| 857 ngx_log_error(r->log_level, r->log, 0, | |
| 858 "DNS error (%d: %s), query id:%d", | |
| 859 code, ngx_resolver_strerror(code), ident); | |
| 860 return; | |
| 861 } | |
| 862 | |
| 863 if (nqs != 1) { | |
| 864 err = "invalid number of questions in DNS response"; | |
| 865 goto done; | |
| 866 } | |
| 867 | |
| 868 i = sizeof(ngx_resolver_query_t); | |
| 869 | |
| 870 while (i < (ngx_uint_t) n) { | |
| 871 if (buf[i] == '\0') { | |
| 872 goto found; | |
| 873 } | |
| 874 | |
| 875 len = buf[i]; | |
| 876 i += 1 + len; | |
| 877 } | |
| 878 | |
| 879 goto short_response; | |
| 880 | |
| 881 found: | |
| 882 | |
| 883 if (i++ == 0) { | |
| 884 err = "zero-length domain name in DNS response"; | |
| 885 goto done; | |
| 886 } | |
| 887 | |
| 888 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t)) | |
| 889 > (ngx_uint_t) n) | |
| 890 { | |
| 891 goto short_response; | |
| 892 } | |
| 893 | |
| 894 qs = (ngx_resolver_qs_t *) &buf[i]; | |
| 895 | |
| 896 qtype = (qs->type_hi << 8) + qs->type_lo; | |
| 897 qclass = (qs->class_hi << 8) + qs->class_lo; | |
| 898 | |
| 899 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 900 "resolver DNS response qt:%d cl:%d", qtype, qclass); | |
| 901 | |
| 902 if (qclass != 1) { | |
| 903 ngx_log_error(r->log_level, r->log, 0, | |
| 904 "unknown query class %d in DNS response", qclass); | |
| 905 return; | |
| 906 } | |
| 907 | |
| 908 switch (qtype) { | |
| 909 | |
| 910 case NGX_RESOLVE_A: | |
| 911 | |
| 912 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
|
913 i + sizeof(ngx_resolver_qs_t)); |
| 1649 | 914 |
| 915 break; | |
| 916 | |
| 917 case NGX_RESOLVE_PTR: | |
| 918 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
919 ngx_resolver_process_ptr(r, buf, n, ident, code, nan); |
| 1649 | 920 |
| 921 break; | |
| 922 | |
| 923 default: | |
| 924 ngx_log_error(r->log_level, r->log, 0, | |
| 925 "unknown query type %d in DNS response", qtype); | |
| 926 return; | |
| 927 } | |
| 928 | |
| 929 return; | |
| 930 | |
| 931 short_response: | |
| 932 | |
| 933 err = "short dns response"; | |
| 934 | |
| 935 done: | |
| 936 | |
| 937 ngx_log_error(r->log_level, r->log, 0, err); | |
| 938 | |
| 939 return; | |
| 940 } | |
| 941 | |
| 942 | |
| 943 static void | |
| 944 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last, | |
| 945 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans) | |
| 583 | 946 { |
| 1649 | 947 char *err; |
| 948 u_char *cname; | |
| 949 size_t len; | |
| 950 uint32_t hash; | |
| 951 in_addr_t addr, *addrs; | |
| 952 ngx_str_t name; | |
| 953 ngx_uint_t qtype, qident, naddrs, a, i, n, start; | |
| 954 ngx_resolver_an_t *an; | |
| 955 ngx_resolver_ctx_t *ctx, *next; | |
| 956 ngx_resolver_node_t *rn; | |
| 957 | |
| 958 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) { | |
| 959 return; | |
| 960 } | |
| 961 | |
| 962 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); | |
| 963 | |
| 964 hash = ngx_crc32_short(name.data, name.len); | |
| 965 | |
| 966 /* lock name mutex */ | |
| 967 | |
| 968 rn = ngx_resolver_lookup_name(r, &name, hash); | |
| 969 | |
| 970 if (rn == NULL || rn->query == NULL) { | |
| 971 ngx_log_error(r->log_level, r->log, 0, | |
| 972 "unexpected response for %V", &name); | |
| 973 goto failed; | |
| 974 } | |
| 975 | |
| 976 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 977 | |
| 978 if (ident != qident) { | |
| 979 ngx_log_error(r->log_level, r->log, 0, | |
| 980 "wrong ident %d response for %V, expect %d", | |
| 981 ident, &name, qident); | |
| 982 goto failed; | |
| 983 } | |
| 984 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
985 if (code == 0 && nan == 0) { |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
986 code = 3; /* NXDOMAIN */ |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
987 } |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
988 |
| 1649 | 989 if (code) { |
| 990 next = rn->waiting; | |
| 991 rn->waiting = NULL; | |
| 992 | |
| 993 ngx_queue_remove(&rn->queue); | |
| 994 | |
| 995 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 996 | |
| 997 ngx_resolver_free_node(r, rn); | |
| 998 | |
| 999 /* unlock name mutex */ | |
| 1000 | |
| 1001 while (next) { | |
| 1002 ctx = next; | |
| 1003 ctx->state = code; | |
| 1004 next = ctx->next; | |
| 1005 | |
| 1006 ctx->handler(ctx); | |
| 1007 } | |
| 1008 | |
| 1009 return; | |
| 1010 } | |
| 1011 | |
| 1012 i = ans; | |
| 1013 naddrs = 0; | |
| 1014 addr = 0; | |
| 1015 addrs = NULL; | |
| 1016 cname = NULL; | |
| 1017 qtype = 0; | |
| 1018 | |
| 1019 for (a = 0; a < nan; a++) { | |
| 1020 | |
| 1021 start = i; | |
| 1022 | |
| 1023 while (i < last) { | |
| 1024 | |
| 1025 if (buf[i] & 0xc0) { | |
| 1026 i += 2; | |
| 1027 goto found; | |
| 1028 } | |
| 1029 | |
| 1030 if (buf[i] == 0) { | |
| 1031 i++; | |
| 1032 goto test_length; | |
| 1033 } | |
| 1034 | |
| 1035 i += 1 + buf[i]; | |
| 1036 } | |
| 1037 | |
| 1038 goto short_response; | |
| 1039 | |
| 1040 test_length: | |
| 1041 | |
| 1042 if (i - start < 2) { | |
| 1043 err = "invalid name in dns response"; | |
| 1044 goto invalid; | |
| 1045 } | |
| 1046 | |
| 1047 found: | |
| 1048 | |
| 1049 if (i + sizeof(ngx_resolver_an_t) >= last) { | |
| 1050 goto short_response; | |
| 1051 } | |
| 1052 | |
| 1053 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1054 | |
| 1055 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1056 len = (an->len_hi << 8) + an->len_lo; | |
| 1057 | |
| 1058 if (qtype == NGX_RESOLVE_A) { | |
| 1059 | |
| 1060 i += sizeof(ngx_resolver_an_t); | |
| 1061 | |
| 1062 if (i + len > last) { | |
| 1063 goto short_response; | |
| 1064 } | |
| 1065 | |
| 1066 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1067 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1068 | |
| 1069 naddrs++; | |
| 1070 | |
| 1071 i += len; | |
| 1072 | |
| 1073 } else if (qtype == NGX_RESOLVE_CNAME) { | |
| 1074 cname = &buf[i] + sizeof(ngx_resolver_an_t); | |
| 1075 i += sizeof(ngx_resolver_an_t) + len; | |
| 1076 } | |
| 1077 } | |
| 1078 | |
| 1079 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1080 "resolver naddrs:%ui cname:%p", naddrs, cname); | |
| 1081 | |
| 1082 if (naddrs) { | |
| 1083 | |
| 1084 if (naddrs == 1) { | |
| 1085 rn->u.addr = addr; | |
| 1086 | |
| 1087 } else { | |
| 1088 | |
| 1089 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t)); | |
| 1090 if (addrs == NULL) { | |
| 1091 return; | |
| 1092 } | |
| 1093 | |
| 1094 n = 0; | |
| 1095 i = ans; | |
| 1096 | |
| 1097 for (a = 0; a < nan; a++) { | |
| 1098 | |
| 1099 for ( ;; ) { | |
| 1100 | |
| 1101 if (buf[i] & 0xc0) { | |
| 1102 i += 2; | |
| 1103 goto ok; | |
| 1104 } | |
| 1105 | |
| 1106 if (buf[i] == 0) { | |
| 1107 i++; | |
| 1108 goto ok; | |
| 1109 } | |
| 1110 | |
| 1111 i += 1 + buf[i]; | |
| 1112 } | |
| 1113 | |
| 1114 ok: | |
| 1115 | |
| 1116 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1117 | |
| 1118 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1119 len = (an->len_hi << 8) + an->len_lo; | |
| 1120 | |
| 1121 i += sizeof(ngx_resolver_an_t); | |
| 1122 | |
| 1123 if (qtype == NGX_RESOLVE_A) { | |
| 1124 | |
| 1125 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1126 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1127 | |
| 1128 if (n == naddrs) { | |
| 1129 break; | |
| 1130 } | |
| 1131 } | |
| 1132 | |
| 1133 i += len; | |
| 1134 } | |
| 1135 | |
| 1136 rn->u.addrs = addrs; | |
| 1137 | |
| 1138 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
| 1139 naddrs * sizeof(in_addr_t)); | |
| 1140 if (addrs == NULL) { | |
| 1141 return; | |
| 1142 } | |
| 1143 } | |
| 1144 | |
| 1145 rn->naddrs = (u_short) naddrs; | |
| 1146 | |
| 1147 ngx_queue_remove(&rn->queue); | |
| 1148 | |
| 1149 rn->valid = ngx_time() + r->valid; | |
| 1150 rn->expire = ngx_time() + r->expire; | |
| 1151 | |
| 1152 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1153 | |
| 1154 next = rn->waiting; | |
| 1155 rn->waiting = NULL; | |
| 1156 | |
| 1157 /* unlock name mutex */ | |
| 1158 | |
| 1159 while (next) { | |
| 1160 ctx = next; | |
| 1161 ctx->state = NGX_OK; | |
| 1162 ctx->naddrs = naddrs; | |
| 1163 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 1164 ctx->addr = addr; | |
| 1165 next = ctx->next; | |
| 1166 | |
| 1167 ctx->handler(ctx); | |
| 1168 } | |
| 1169 | |
| 1170 if (naddrs) { | |
| 1171 ngx_resolver_free(r, addrs); | |
| 1172 } | |
| 1173 | |
| 1174 return; | |
| 1175 | |
| 1176 } else if (cname) { | |
| 1177 | |
| 1178 /* CNAME only */ | |
| 1179 | |
| 1180 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) { | |
| 1181 return; | |
| 1182 } | |
| 1183 | |
| 1184 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1185 "resolver cname:\"%V\"", &name); | |
| 1186 | |
|
1741
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1187 ngx_queue_remove(&rn->queue); |
|
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1188 |
| 1649 | 1189 rn->cnlen = (u_short) name.len; |
| 1190 rn->u.cname = name.data; | |
| 1191 rn->valid = ngx_time() + r->valid; | |
| 1192 rn->expire = ngx_time() + r->expire; | |
| 1193 | |
| 1194 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1195 | |
| 1196 ctx = rn->waiting; | |
| 1197 rn->waiting = NULL; | |
| 1198 | |
| 1199 if (ctx) { | |
| 1200 ctx->name = name; | |
| 1201 | |
| 1202 (void) ngx_resolve_name_locked(r, ctx); | |
| 1203 } | |
| 1204 | |
| 1205 return; | |
| 1206 } | |
| 1207 | |
| 1208 ngx_log_error(r->log_level, r->log, 0, | |
| 1209 "no A or CNAME types in DNS responses, unknown query type: %d", | |
| 1210 qtype); | |
| 1211 return; | |
| 1212 | |
| 1213 short_response: | |
| 1214 | |
| 1215 err = "short dns response"; | |
| 1216 | |
| 1217 invalid: | |
| 1218 | |
| 1219 /* unlock name mutex */ | |
| 1220 | |
| 1221 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1222 | |
| 1223 return; | |
| 1224 | |
| 1225 failed: | |
| 1226 | |
| 1227 /* unlock name mutex */ | |
| 1228 | |
| 1229 return; | |
| 1230 } | |
| 1231 | |
| 1232 | |
| 1233 static void | |
| 1234 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
|
1235 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan) |
| 1649 | 1236 { |
| 1237 char *err; | |
| 1238 size_t len; | |
| 1239 in_addr_t addr; | |
| 1240 ngx_int_t digit; | |
| 1241 ngx_str_t name; | |
| 1242 ngx_uint_t i, mask, qtype, qclass, qident; | |
| 1243 ngx_resolver_an_t *an; | |
| 1244 ngx_resolver_ctx_t *ctx, *next; | |
| 1245 ngx_resolver_node_t *rn; | |
| 1246 | |
| 1247 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) { | |
| 1248 goto invalid_in_addr_arpa; | |
| 1249 } | |
| 1250 | |
| 1251 addr = 0; | |
| 1252 i = 12; | |
| 1253 | |
| 1254 for (mask = 0; mask < 32; mask += 8) { | |
| 1255 len = buf[i++]; | |
| 1256 | |
| 1257 digit = ngx_atoi(&buf[i], len); | |
| 1258 if (digit == NGX_ERROR || digit > 255) { | |
| 1259 goto invalid_in_addr_arpa; | |
| 1260 } | |
| 1261 | |
| 1262 addr += digit << mask; | |
| 1263 i += len; | |
| 1264 } | |
| 1265 | |
| 1266 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) { | |
| 1267 goto invalid_in_addr_arpa; | |
| 1268 } | |
| 1269 | |
| 1270 /* lock addr mutex */ | |
| 1271 | |
| 1272 rn = ngx_resolver_lookup_addr(r, addr); | |
| 1273 | |
| 1274 if (rn == NULL || rn->query == NULL) { | |
| 1275 ngx_log_error(r->log_level, r->log, 0, | |
| 1276 "unexpected response for %ud.%ud.%ud.%ud", | |
| 1277 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 1278 (addr >> 8) & 0xff, addr & 0xff); | |
| 1279 goto failed; | |
| 1280 } | |
| 1281 | |
| 1282 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 1283 | |
| 1284 if (ident != qident) { | |
| 1285 ngx_log_error(r->log_level, r->log, 0, | |
| 1286 "wrong ident %d response for %ud.%ud.%ud.%ud, expect %d", | |
| 1287 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 1288 (addr >> 8) & 0xff, addr & 0xff, qident); | |
| 1289 goto failed; | |
| 1290 } | |
| 1291 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1292 if (code == 0 && nan == 0) { |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1293 code = 3; /* NXDOMAIN */ |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1294 } |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1295 |
| 1649 | 1296 if (code) { |
| 1297 next = rn->waiting; | |
| 1298 rn->waiting = NULL; | |
| 1299 | |
| 1300 ngx_queue_remove(&rn->queue); | |
| 1301 | |
| 1302 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 1303 | |
| 1304 ngx_resolver_free_node(r, rn); | |
| 1305 | |
| 1306 /* unlock addr mutex */ | |
| 1307 | |
| 1308 while (next) { | |
| 1309 ctx = next; | |
| 1310 ctx->state = code; | |
| 1311 next = ctx->next; | |
| 1312 | |
| 1313 ctx->handler(ctx); | |
| 1314 } | |
| 1315 | |
| 1316 return; | |
| 1317 } | |
| 1318 | |
| 1319 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t); | |
| 1320 | |
| 1321 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) { | |
| 1322 goto short_response; | |
| 1323 } | |
| 1324 | |
| 1325 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */ | |
| 1326 | |
| 1327 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) { | |
| 1328 err = "invalid in-addr.arpa name in DNS response"; | |
| 1329 goto invalid; | |
| 1330 } | |
| 1331 | |
| 1332 an = (ngx_resolver_an_t *) &buf[i + 2]; | |
| 1333 | |
| 1334 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1335 qclass = (an->class_hi << 8) + an->class_lo; | |
| 1336 len = (an->len_hi << 8) + an->len_lo; | |
| 1337 | |
| 1338 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1339 "resolver qt:%d cl:%d len:%uz", qtype, qclass, len); | |
| 1340 | |
| 1341 i += 2 + sizeof(ngx_resolver_an_t); | |
| 1342 | |
| 1343 if (i + len > (ngx_uint_t) n) { | |
| 1344 goto short_response; | |
| 1345 } | |
| 1346 | |
| 1347 len -= 2; | |
| 1348 | |
| 1349 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) { | |
| 1350 return; | |
| 1351 } | |
| 1352 | |
| 1353 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name); | |
| 1354 | |
| 1355 if (len != (size_t) rn->nlen || ngx_strncmp(name.data, rn->name, len) != 0) | |
| 1356 { | |
| 1357 ngx_resolver_free(r, rn->name); | |
| 1358 rn->name = name.data; | |
| 1359 | |
| 1360 name.data = ngx_resolver_dup(r, rn->name, len); | |
| 1361 if (name.data == NULL) { | |
| 1362 goto failed; | |
| 1363 } | |
| 1364 } | |
| 1365 | |
| 1366 ngx_queue_remove(&rn->queue); | |
| 1367 | |
| 1368 rn->valid = ngx_time() + r->valid; | |
| 1369 rn->expire = ngx_time() + r->expire; | |
| 1370 | |
| 1371 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
| 1372 | |
| 1373 next = rn->waiting; | |
| 1374 rn->waiting = NULL; | |
| 1375 | |
| 1376 /* unlock addr mutex */ | |
| 1377 | |
| 1378 while (next) { | |
| 1379 ctx = next; | |
| 1380 ctx->state = NGX_OK; | |
| 1381 ctx->name = name; | |
| 1382 next = ctx->next; | |
| 1383 | |
| 1384 ctx->handler(ctx); | |
| 1385 } | |
| 1386 | |
| 1387 ngx_resolver_free(r, name.data); | |
| 1388 | |
| 1389 return; | |
| 1390 | |
| 1391 invalid_in_addr_arpa: | |
| 1392 | |
| 1393 ngx_log_error(r->log_level, r->log, 0, | |
| 1394 "invalid in-addr.arpa name in DNS response"); | |
| 1395 return; | |
| 1396 | |
| 1397 short_response: | |
| 1398 | |
| 1399 err = "short DNS response"; | |
| 1400 | |
| 1401 invalid: | |
| 1402 | |
| 1403 /* unlock addr mutex */ | |
| 1404 | |
| 1405 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1406 | |
| 1407 return; | |
| 1408 | |
| 1409 failed: | |
| 1410 | |
| 1411 /* unlock addr mutex */ | |
| 1412 | |
| 1413 return; | |
| 1414 } | |
| 1415 | |
| 1416 | |
| 1417 static ngx_resolver_node_t * | |
| 1418 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) | |
| 1419 { | |
| 1420 ngx_int_t rc; | |
| 1421 size_t len; | |
| 1422 ngx_rbtree_node_t *node, *sentinel; | |
| 1423 ngx_resolver_node_t *rn; | |
| 1424 | |
| 1425 node = r->name_rbtree.root; | |
| 1426 sentinel = r->name_rbtree.sentinel; | |
| 1427 | |
| 1428 while (node != sentinel) { | |
| 1429 | |
| 1430 if (hash < node->key) { | |
| 1431 node = node->left; | |
| 1432 continue; | |
| 1433 } | |
| 1434 | |
| 1435 if (hash > node->key) { | |
| 1436 node = node->right; | |
| 1437 continue; | |
| 1438 } | |
| 1439 | |
| 1440 /* hash == node->key */ | |
| 1441 | |
| 1442 do { | |
| 1443 rn = (ngx_resolver_node_t *) node; | |
| 1444 | |
| 1445 len = (name->len > (size_t) rn->nlen) ? rn->nlen : name->len; | |
| 1446 | |
| 1447 rc = ngx_strncmp(name->data, rn->name, len); | |
| 1448 | |
| 1449 if (rc == 0) { | |
| 1450 return rn; | |
| 1451 } | |
| 1452 | |
| 1453 node = (rc < 0) ? node->left : node->right; | |
| 1454 | |
| 1455 } while (node != sentinel && hash == node->key); | |
| 1456 | |
| 1457 break; | |
| 1458 } | |
| 1459 | |
| 1460 /* not found */ | |
| 1461 | |
| 1462 return NULL; | |
| 1463 } | |
| 1464 | |
| 1465 | |
| 1466 static ngx_resolver_node_t * | |
| 1467 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr) | |
| 1468 { | |
| 1469 ngx_rbtree_node_t *node, *sentinel; | |
| 1470 | |
| 1471 node = r->addr_rbtree.root; | |
| 1472 sentinel = r->addr_rbtree.sentinel; | |
| 1473 | |
| 1474 while (node != sentinel) { | |
| 1475 | |
| 1476 if (addr < node->key) { | |
| 1477 node = node->left; | |
| 1478 continue; | |
| 1479 } | |
| 1480 | |
| 1481 if (addr > node->key) { | |
| 1482 node = node->right; | |
| 1483 continue; | |
| 1484 } | |
| 1485 | |
| 1486 /* addr == node->key */ | |
| 1487 | |
| 1488 return (ngx_resolver_node_t *) node; | |
| 1489 } | |
| 1490 | |
| 1491 /* not found */ | |
| 1492 | |
| 1493 return NULL; | |
| 1494 } | |
| 1495 | |
| 1496 | |
| 1497 static void | |
| 1498 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
| 1499 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
| 1500 { | |
| 1501 size_t len; | |
| 1502 ngx_rbtree_node_t **p; | |
| 1503 ngx_resolver_node_t *rn, *rn_temp; | |
| 1504 | |
| 1505 for ( ;; ) { | |
| 1506 | |
| 1507 if (node->key < temp->key) { | |
| 1508 | |
| 1509 p = &temp->left; | |
| 1510 | |
| 1511 } else if (node->key > temp->key) { | |
| 1512 | |
| 1513 p = &temp->right; | |
| 1514 | |
| 1515 } else { /* node->key == temp->key */ | |
| 1516 | |
| 1517 rn = (ngx_resolver_node_t *) node; | |
| 1518 rn_temp = (ngx_resolver_node_t *) temp; | |
| 1519 | |
| 1520 len = (rn->nlen > rn_temp->nlen) ? rn_temp->nlen : rn->nlen; | |
| 1521 | |
| 1522 p = (ngx_strncmp(rn->name, rn_temp->name, len) < 0) | |
| 1523 ? &temp->left : &temp->right; | |
| 1524 } | |
| 1525 | |
| 1526 if (*p == sentinel) { | |
| 1527 break; | |
| 1528 } | |
| 1529 | |
| 1530 temp = *p; | |
| 1531 } | |
| 1532 | |
| 1533 *p = node; | |
| 1534 node->parent = temp; | |
| 1535 node->left = sentinel; | |
| 1536 node->right = sentinel; | |
| 1537 ngx_rbt_red(node); | |
| 1538 } | |
| 1539 | |
| 1540 | |
| 1541 static ngx_int_t | |
| 1542 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1543 { | |
| 1544 u_char *p, *s; | |
| 1545 size_t len; | |
| 1546 ngx_uint_t ident; | |
| 1547 ngx_resolver_qs_t *qs; | |
| 1548 ngx_resolver_query_t *query; | |
| 1549 | |
| 1550 len = sizeof(ngx_resolver_query_t) | |
| 1551 + 1 + ctx->name.len + 1 + sizeof(ngx_resolver_qs_t); | |
| 1552 | |
| 1553 p = ngx_resolver_calloc(ctx->resolver, len); | |
| 1554 if (p == NULL) { | |
| 1555 return NGX_ERROR; | |
| 1556 } | |
| 1557 | |
| 1558 rn->qlen = (u_short) len; | |
| 1559 rn->query = p; | |
| 1560 | |
| 1561 query = (ngx_resolver_query_t *) p; | |
| 1562 | |
| 1563 ident = ngx_random(); | |
| 1564 | |
| 1565 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0, | |
| 1566 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff); | |
| 1567 | |
| 1568 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1569 query->ident_lo = (u_char) (ident & 0xff); | |
| 1570 | |
| 1571 /* recursion query */ | |
| 1572 query->flags_hi = 1; query->flags_lo = 0; | |
| 1573 | |
| 1574 /* one question */ | |
| 1575 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1576 query->nan_hi = 0; query->nan_lo = 0; | |
| 1577 query->nns_hi = 0; query->nns_lo = 0; | |
| 1578 query->nar_hi = 0; query->nar_lo = 0; | |
| 1579 | |
| 1580 p += sizeof(ngx_resolver_query_t) + 1 + ctx->name.len + 1; | |
| 1581 | |
| 1582 qs = (ngx_resolver_qs_t *) p; | |
| 1583 | |
| 1584 /* query type */ | |
| 1585 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type; | |
| 1586 | |
| 1587 /* IP query class */ | |
| 1588 qs->class_hi = 0; qs->class_lo = 1; | |
| 1589 | |
| 1590 /* convert "www.example.com" to "\3www\7example\3com\0" */ | |
| 1591 | |
| 1592 len = 0; | |
| 1593 p--; | |
| 1594 *p-- = '\0'; | |
| 1595 | |
| 1596 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) { | |
| 1597 if (*s != '.') { | |
| 1598 *p = *s; | |
| 1599 len++; | |
| 1600 | |
| 1601 } else { | |
| 1602 *p = (u_char) len; | |
| 1603 len = 0; | |
| 1604 } | |
| 1605 | |
| 1606 p--; | |
| 1607 } | |
| 1608 | |
| 1609 *p = (u_char) len; | |
| 1610 | |
| 1611 return NGX_OK; | |
| 1612 } | |
| 1613 | |
| 1614 | |
| 1615 /* AF_INET only */ | |
| 1616 | |
| 1617 static ngx_int_t | |
| 1618 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1619 { | |
| 1620 u_char *p, *d; | |
| 1621 size_t len; | |
| 1622 ngx_int_t n; | |
| 1623 ngx_uint_t ident; | |
| 1624 ngx_resolver_query_t *query; | |
| 1625 | |
| 1626 len = sizeof(ngx_resolver_query_t) | |
| 1627 + sizeof(".255.255.255.255.in-addr.arpa.") - 1 | |
| 1628 + sizeof(ngx_resolver_qs_t); | |
| 1629 | |
| 1630 p = ngx_resolver_calloc(ctx->resolver, len); | |
| 1631 if (p == NULL) { | |
| 1632 return NGX_ERROR; | |
| 1633 } | |
| 1634 | |
| 1635 rn->query = p; | |
| 1636 query = (ngx_resolver_query_t *) p; | |
| 1637 | |
| 1638 ident = ngx_random(); | |
| 1639 | |
| 1640 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1641 query->ident_lo = (u_char) (ident & 0xff); | |
| 1642 | |
| 1643 /* recursion query */ | |
| 1644 query->flags_hi = 1; query->flags_lo = 0; | |
| 1645 | |
| 1646 /* one question */ | |
| 1647 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1648 query->nan_hi = 0; query->nan_lo = 0; | |
| 1649 query->nns_hi = 0; query->nns_lo = 0; | |
| 1650 query->nar_hi = 0; query->nar_lo = 0; | |
| 1651 | |
| 1652 p += sizeof(ngx_resolver_query_t); | |
| 1653 | |
| 1654 for (n = 0; n < 32; n += 8){ | |
| 1655 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff); | |
| 1656 *p = (u_char) (d - &p[1]); | |
| 1657 p = d; | |
| 1658 } | |
| 1659 | |
| 1660 /* query type "PTR", IP query class */ | |
| 1661 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18); | |
| 1662 | |
| 1663 rn->qlen = (u_short) | |
| 1664 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t) | |
| 1665 - rn->query); | |
| 1666 | |
| 1667 return NGX_OK; | |
| 1668 } | |
| 1669 | |
| 1670 | |
| 1671 static ngx_int_t | |
| 1672 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src, | |
| 1673 u_char *last) | |
| 1674 { | |
| 1675 char *err; | |
| 1676 u_char *p, *dst; | |
| 1677 ssize_t len; | |
| 1678 ngx_uint_t i, n; | |
| 1679 | |
| 1680 p = src; | |
| 1681 len = -1; | |
| 1682 | |
| 1683 /* | |
| 1684 * compression pointers allow to create endless loop, so we set limit; | |
| 1685 * 128 pointers should be enough to store 255-byte name | |
| 1686 */ | |
| 1687 | |
| 1688 for (i = 0; i < 128; i++) { | |
| 1689 n = *p++; | |
| 1690 | |
| 1691 if (n == 0) { | |
| 1692 goto done; | |
| 1693 } | |
| 1694 | |
| 1695 if (n & 0xc0) { | |
| 1696 n = (n & 0x3f << 8) + *p; | |
| 1697 p = &buf[n]; | |
| 1698 | |
| 1699 } else { | |
| 1700 len += 1 + n; | |
| 1701 p = &p[n]; | |
| 1702 } | |
| 1703 | |
| 1704 if (p >= last) { | |
| 1705 err = "name is out of response"; | |
| 1706 goto invalid; | |
| 1707 } | |
| 1708 } | |
| 1709 | |
| 1710 err = "compression pointers loop"; | |
| 1711 | |
| 1712 invalid: | |
| 1713 | |
| 1714 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1715 | |
| 1716 return NGX_ERROR; | |
| 1717 | |
| 1718 done: | |
| 1719 | |
| 1720 if (name == NULL) { | |
| 583 | 1721 return NGX_OK; |
| 1722 } | |
| 1723 | |
| 1649 | 1724 dst = ngx_resolver_alloc(r, len); |
| 1725 if (dst == NULL) { | |
| 1726 return NGX_ERROR; | |
| 1727 } | |
| 1728 | |
| 1729 name->data = dst; | |
| 1730 | |
| 1731 n = *src++; | |
| 1732 | |
| 1733 for ( ;; ) { | |
| 1734 if (n != 0xc0) { | |
| 1735 ngx_memcpy(dst, src, n); | |
| 1736 dst += n; | |
| 1737 src += n; | |
| 1738 | |
| 1739 n = *src++; | |
| 1740 | |
| 1741 if (n != 0) { | |
| 1742 *dst++ = '.'; | |
| 1743 } | |
| 1744 | |
| 1745 } else { | |
| 1746 n = (n & 0x3f << 8) + *src; | |
| 1747 src = &buf[n]; | |
| 1748 | |
| 1749 n = *src++; | |
| 1750 } | |
| 1751 | |
| 1752 if (n == 0) { | |
| 1753 name->len = dst - name->data; | |
| 1754 return NGX_OK; | |
| 1755 } | |
| 1756 } | |
| 1757 } | |
| 1758 | |
| 1759 | |
| 1760 static void | |
| 1761 ngx_resolver_timeout_handler(ngx_event_t *ev) | |
| 1762 { | |
| 1763 ngx_resolver_ctx_t *ctx; | |
| 1764 | |
| 1765 ctx = ev->data; | |
| 1766 | |
| 1767 ctx->state = NGX_RESOLVE_TIMEDOUT; | |
| 1768 | |
| 1769 ctx->handler(ctx); | |
| 1770 } | |
| 1771 | |
| 1772 | |
| 1773 static void | |
| 1774 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 1775 { | |
| 1776 /* lock alloc mutex */ | |
| 1777 | |
| 1778 if (rn->query) { | |
| 1779 ngx_resolver_free_locked(r, rn->query); | |
| 1780 } | |
| 1781 | |
| 1782 if (rn->name) { | |
| 1783 ngx_resolver_free_locked(r, rn->name); | |
| 1784 } | |
| 1785 | |
| 1786 if (rn->cnlen) { | |
| 1787 ngx_resolver_free_locked(r, rn->u.cname); | |
| 1788 } | |
| 1789 | |
| 1790 if (rn->naddrs > 1) { | |
| 1791 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 1792 } | |
| 1793 | |
| 1794 ngx_resolver_free_locked(r, rn); | |
| 1795 | |
| 1796 /* unlock alloc mutex */ | |
| 1797 } | |
| 1798 | |
| 1799 | |
| 1800 static void * | |
| 1801 ngx_resolver_alloc(ngx_resolver_t *r, size_t size) | |
| 1802 { | |
| 1803 u_char *p; | |
| 1804 | |
| 1805 /* lock alloc mutex */ | |
| 1806 | |
| 1807 p = ngx_alloc(size, r->log); | |
| 1808 | |
| 1809 /* unlock alloc mutex */ | |
| 1810 | |
| 1811 return p; | |
| 1812 } | |
| 1813 | |
| 1814 | |
| 1815 void * | |
| 1816 ngx_resolver_calloc(ngx_resolver_t *r, size_t size) | |
| 1817 { | |
| 1818 u_char *p; | |
| 1819 | |
| 1820 p = ngx_resolver_alloc(r, size); | |
| 1821 | |
| 1822 if (p) { | |
| 1823 ngx_memzero(p, size); | |
| 1824 } | |
| 1825 | |
| 1826 return p; | |
| 1827 } | |
| 1828 | |
| 1829 | |
| 1830 static void | |
| 1831 ngx_resolver_free(ngx_resolver_t *r, void *p) | |
| 1832 { | |
| 1833 /* lock alloc mutex */ | |
| 1834 | |
| 1835 ngx_free(p); | |
| 1836 | |
| 1837 /* unlock alloc mutex */ | |
| 1838 } | |
| 1839 | |
| 1840 | |
| 1841 static void | |
| 1842 ngx_resolver_free_locked(ngx_resolver_t *r, void *p) | |
| 1843 { | |
| 1844 ngx_free(p); | |
| 1845 } | |
| 1846 | |
| 1847 | |
| 1848 static void * | |
| 1849 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size) | |
| 1850 { | |
| 1851 void *dst; | |
| 1852 | |
| 1853 dst = ngx_resolver_alloc(r, size); | |
| 1854 | |
| 1855 if (dst == NULL) { | |
| 1856 return dst; | |
| 1857 } | |
| 1858 | |
| 1859 ngx_memcpy(dst, src, size); | |
| 1860 | |
| 1861 return dst; | |
| 1862 } | |
| 1863 | |
| 1864 | |
| 1865 char * | |
| 1866 ngx_resolver_strerror(ngx_int_t err) | |
| 1867 { | |
| 1868 static char *errors[] = { | |
| 1869 "Format error", /* FORMERR */ | |
| 1870 "Server failure", /* SERVFAIL */ | |
| 1871 "Host not found", /* NXDOMAIN */ | |
| 1872 "Unimplemented", /* NOTIMP */ | |
| 1873 "Operation refused" /* REFUSED */ | |
| 1874 }; | |
| 1875 | |
| 1876 if (err > 0 && err < 6) { | |
| 1877 return errors[err - 1]; | |
| 1878 } | |
| 1879 | |
| 1880 if (err == NGX_RESOLVE_TIMEDOUT) { | |
| 1881 return "Operation timed out"; | |
| 1882 } | |
| 1883 | |
| 1884 return "Unknown error"; | |
| 1885 } | |
| 1886 | |
| 1887 | |
| 1888 ngx_int_t | |
| 1889 ngx_udp_connect(ngx_udp_connection_t *uc) | |
| 1890 { | |
| 1891 int rc; | |
| 1892 ngx_int_t event; | |
| 1893 ngx_event_t *rev, *wev; | |
| 1894 ngx_socket_t s; | |
| 1895 ngx_connection_t *c; | |
| 1896 | |
| 583 | 1897 s = ngx_socket(AF_INET, SOCK_DGRAM, 0); |
| 1898 | |
| 1649 | 1899 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, uc->log, 0, "UDP socket %d", s); |
| 583 | 1900 |
| 1901 if (s == -1) { | |
| 1649 | 1902 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
| 583 | 1903 ngx_socket_n " failed"); |
| 1904 return NGX_ERROR; | |
| 1905 } | |
| 1906 | |
| 1649 | 1907 c = ngx_get_connection(s, uc->log); |
| 583 | 1908 |
| 1909 if (c == NULL) { | |
| 1910 if (ngx_close_socket(s) == -1) { | |
| 1649 | 1911 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
| 583 | 1912 ngx_close_socket_n "failed"); |
| 1913 } | |
| 1914 | |
| 1915 return NGX_ERROR; | |
| 1916 } | |
| 1917 | |
| 1649 | 1918 if (ngx_nonblocking(s) == -1) { |
| 1919 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
| 1920 ngx_nonblocking_n " failed"); | |
| 1921 | |
| 1922 ngx_free_connection(c); | |
| 1923 | |
| 1924 if (ngx_close_socket(s) == -1) { | |
| 1925 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
| 1926 ngx_close_socket_n " failed"); | |
| 1927 } | |
| 1928 | |
| 1929 return NGX_ERROR; | |
| 1930 } | |
| 1931 | |
| 583 | 1932 rev = c->read; |
| 1933 wev = c->write; | |
| 1934 | |
| 1649 | 1935 rev->log = uc->log; |
| 1936 wev->log = uc->log; | |
| 1937 | |
| 1938 uc->connection = c; | |
| 583 | 1939 |
| 1940 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); | |
| 1941 | |
| 1942 #if (NGX_THREADS) | |
| 1649 | 1943 |
| 1944 /* TODO: lock event when call completion handler */ | |
| 1945 | |
| 1946 rev->lock = &c->lock; | |
| 1947 wev->lock = &c->lock; | |
| 583 | 1948 rev->own_lock = &c->lock; |
| 1949 wev->own_lock = &c->lock; | |
| 1649 | 1950 |
| 583 | 1951 #endif |
| 1952 | |
| 1649 | 1953 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, uc->log, 0, |
| 1954 "connect to %V, fd:%d #%d", &uc->server, s, c->number); | |
| 1955 | |
| 1956 rc = connect(s, uc->sockaddr, uc->socklen); | |
| 1957 | |
| 1958 /* TODO: aio, iocp */ | |
| 583 | 1959 |
| 1960 if (rc == -1) { | |
| 1649 | 1961 ngx_log_error(NGX_LOG_CRIT, uc->log, ngx_socket_errno, |
| 1962 "connect() to %V failed", &uc->server); | |
| 583 | 1963 |
| 1964 return NGX_ERROR; | |
| 1965 } | |
| 1966 | |
| 1649 | 1967 /* UDP sockets are always ready to write */ |
| 1968 wev->ready = 1; | |
| 1969 | |
| 1970 if (ngx_add_event) { | |
| 1971 | |
| 1972 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ? | |
| 1973 /* kqueue, epoll */ NGX_CLEAR_EVENT: | |
| 1974 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT; | |
| 1975 /* eventport event type has no meaning: oneshot only */ | |
| 1976 | |
| 1977 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { | |
| 1978 return NGX_ERROR; | |
| 1979 } | |
| 1980 | |
| 1981 } else { | |
| 1982 /* rtsig */ | |
| 1983 | |
| 583 | 1984 if (ngx_add_conn(c) == NGX_ERROR) { |
| 1985 return NGX_ERROR; | |
| 1986 } | |
| 1987 } | |
| 1988 | |
| 1989 return NGX_OK; | |
| 1990 } |