Mercurial > hg > nginx
annotate src/core/ngx_resolver.c @ 4514:79142134d616 stable-1.0
Merge of r4497:
Fixed null pointer dereference in resolver (ticket #91).
The cycle->new_log.file may not be set before config parsing finished if
there are no error_log directive defined at global level. Fix is to
copy it after config parsing.
Patch by Roman Arutyunyan.
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Mon, 05 Mar 2012 13:06:29 +0000 |
| parents | 4919fb357a5d |
| children | 8bb695c05870 |
| rev | line source |
|---|---|
| 583 | 1 |
| 2 /* | |
| 3 * Copyright (C) Igor Sysoev | |
|
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4 * Copyright (C) Nginx, Inc. |
| 583 | 5 */ |
| 6 | |
| 7 | |
| 8 #include <ngx_config.h> | |
| 9 #include <ngx_core.h> | |
| 10 #include <ngx_event.h> | |
| 11 | |
| 12 | |
| 1649 | 13 #define NGX_RESOLVER_UDP_SIZE 4096 |
| 14 | |
| 15 | |
| 583 | 16 typedef struct { |
| 1649 | 17 u_char ident_hi; |
| 18 u_char ident_lo; | |
| 19 u_char flags_hi; | |
| 20 u_char flags_lo; | |
| 21 u_char nqs_hi; | |
| 22 u_char nqs_lo; | |
| 23 u_char nan_hi; | |
| 24 u_char nan_lo; | |
| 25 u_char nns_hi; | |
| 26 u_char nns_lo; | |
| 27 u_char nar_hi; | |
| 28 u_char nar_lo; | |
| 29 } ngx_resolver_query_t; | |
| 30 | |
| 31 | |
| 32 typedef struct { | |
| 33 u_char type_hi; | |
| 34 u_char type_lo; | |
| 35 u_char class_hi; | |
| 36 u_char class_lo; | |
| 37 } ngx_resolver_qs_t; | |
| 38 | |
| 39 | |
| 40 typedef struct { | |
| 41 u_char type_hi; | |
| 42 u_char type_lo; | |
| 43 u_char class_hi; | |
| 44 u_char class_lo; | |
| 45 u_char ttl[4]; | |
| 46 u_char len_hi; | |
| 47 u_char len_lo; | |
| 48 } ngx_resolver_an_t; | |
| 49 | |
| 50 | |
| 51 ngx_int_t ngx_udp_connect(ngx_udp_connection_t *uc); | |
| 52 | |
| 53 | |
| 1906 | 54 static void ngx_resolver_cleanup(void *data); |
| 55 static void ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree); | |
| 1649 | 56 static ngx_int_t ngx_resolve_name_locked(ngx_resolver_t *r, |
| 57 ngx_resolver_ctx_t *ctx); | |
| 58 static void ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
| 59 ngx_queue_t *queue); | |
| 60 static ngx_int_t ngx_resolver_send_query(ngx_resolver_t *r, | |
| 61 ngx_resolver_node_t *rn); | |
| 62 static ngx_int_t ngx_resolver_create_name_query(ngx_resolver_node_t *rn, | |
| 63 ngx_resolver_ctx_t *ctx); | |
| 64 static ngx_int_t ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, | |
| 65 ngx_resolver_ctx_t *ctx); | |
| 66 static void ngx_resolver_resend_handler(ngx_event_t *ev); | |
| 67 static time_t ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
| 68 ngx_queue_t *queue); | |
| 69 static void ngx_resolver_read_response(ngx_event_t *rev); | |
| 70 static void ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, | |
| 71 size_t n); | |
| 72 static void ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t n, | |
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73 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans); |
| 1649 | 74 static void ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, |
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75 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan); |
| 1649 | 76 static ngx_resolver_node_t *ngx_resolver_lookup_name(ngx_resolver_t *r, |
| 77 ngx_str_t *name, uint32_t hash); | |
| 78 static ngx_resolver_node_t *ngx_resolver_lookup_addr(ngx_resolver_t *r, | |
| 79 in_addr_t addr); | |
| 80 static void ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
| 81 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel); | |
| 82 static ngx_int_t ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, | |
| 83 u_char *buf, u_char *src, u_char *last); | |
| 84 static void ngx_resolver_timeout_handler(ngx_event_t *ev); | |
| 85 static void ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn); | |
| 86 static void *ngx_resolver_alloc(ngx_resolver_t *r, size_t size); | |
| 1903 | 87 static void *ngx_resolver_calloc(ngx_resolver_t *r, size_t size); |
| 1649 | 88 static void ngx_resolver_free(ngx_resolver_t *r, void *p); |
| 89 static void ngx_resolver_free_locked(ngx_resolver_t *r, void *p); | |
| 90 static void *ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size); | |
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91 static u_char *ngx_resolver_log_error(ngx_log_t *log, u_char *buf, size_t len); |
| 1649 | 92 |
| 93 | |
| 94 ngx_resolver_t * | |
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95 ngx_resolver_create(ngx_conf_t *cf, ngx_addr_t *addr) |
| 1649 | 96 { |
| 97 ngx_resolver_t *r; | |
| 1906 | 98 ngx_pool_cleanup_t *cln; |
| 1649 | 99 ngx_udp_connection_t *uc; |
| 100 | |
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101 cln = ngx_pool_cleanup_add(cf->pool, 0); |
| 1906 | 102 if (cln == NULL) { |
| 103 return NULL; | |
| 104 } | |
| 105 | |
| 106 cln->handler = ngx_resolver_cleanup; | |
| 107 | |
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108 r = ngx_calloc(sizeof(ngx_resolver_t), cf->log); |
| 1649 | 109 if (r == NULL) { |
| 110 return NULL; | |
| 111 } | |
| 112 | |
| 1906 | 113 cln->data = r; |
| 114 | |
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115 r->event = ngx_calloc(sizeof(ngx_event_t), cf->log); |
| 1649 | 116 if (r->event == NULL) { |
| 117 return NULL; | |
| 118 } | |
| 119 | |
| 1687 | 120 ngx_rbtree_init(&r->name_rbtree, &r->name_sentinel, |
| 121 ngx_resolver_rbtree_insert_value); | |
| 122 | |
| 123 ngx_rbtree_init(&r->addr_rbtree, &r->addr_sentinel, | |
| 124 ngx_rbtree_insert_value); | |
| 1649 | 125 |
| 1685 | 126 ngx_queue_init(&r->name_resend_queue); |
| 127 ngx_queue_init(&r->addr_resend_queue); | |
| 128 | |
| 129 ngx_queue_init(&r->name_expire_queue); | |
| 130 ngx_queue_init(&r->addr_expire_queue); | |
| 1649 | 131 |
| 132 r->event->handler = ngx_resolver_resend_handler; | |
| 133 r->event->data = r; | |
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134 r->event->log = &cf->cycle->new_log; |
| 1649 | 135 r->ident = -1; |
| 136 | |
| 137 r->resend_timeout = 5; | |
| 138 r->expire = 30; | |
| 139 r->valid = 300; | |
| 140 | |
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141 r->log = &cf->cycle->new_log; |
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142 r->log_level = NGX_LOG_ERR; |
| 1649 | 143 |
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144 if (addr) { |
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145 uc = ngx_calloc(sizeof(ngx_udp_connection_t), cf->log); |
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146 if (uc == NULL) { |
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147 return NULL; |
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148 } |
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149 |
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150 r->udp_connection = uc; |
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151 |
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152 uc->sockaddr = addr->sockaddr; |
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153 uc->socklen = addr->socklen; |
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154 uc->server = addr->name; |
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155 } |
| 1649 | 156 |
| 157 return r; | |
| 158 } | |
| 159 | |
| 160 | |
| 1906 | 161 static void |
| 162 ngx_resolver_cleanup(void *data) | |
| 163 { | |
| 164 ngx_resolver_t *r = data; | |
| 165 | |
| 166 if (r) { | |
| 167 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, | |
| 168 "cleanup resolver"); | |
| 169 | |
| 170 ngx_resolver_cleanup_tree(r, &r->name_rbtree); | |
| 171 | |
| 172 ngx_resolver_cleanup_tree(r, &r->addr_rbtree); | |
| 173 | |
| 174 if (r->event) { | |
| 175 ngx_free(r->event); | |
| 176 } | |
| 177 | |
| 178 if (r->udp_connection) { | |
| 179 if (r->udp_connection->connection) { | |
| 180 ngx_close_connection(r->udp_connection->connection); | |
| 181 } | |
| 182 | |
| 183 ngx_free(r->udp_connection); | |
| 184 } | |
| 185 | |
| 186 ngx_free(r); | |
| 187 } | |
| 188 } | |
| 189 | |
| 190 | |
| 191 static void | |
| 192 ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree) | |
| 193 { | |
| 194 ngx_resolver_ctx_t *ctx, *next; | |
| 195 ngx_resolver_node_t *rn; | |
| 196 | |
| 197 while (tree->root != tree->sentinel) { | |
| 198 | |
| 199 rn = (ngx_resolver_node_t *) ngx_rbtree_min(tree->root, tree->sentinel); | |
| 200 | |
| 201 ngx_queue_remove(&rn->queue); | |
| 202 | |
| 203 for (ctx = rn->waiting; ctx; ctx = next) { | |
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204 next = ctx->next; |
| 1906 | 205 |
| 206 if (ctx->event) { | |
| 207 ngx_resolver_free(r, ctx->event); | |
| 208 } | |
| 209 | |
| 210 ngx_resolver_free(r, ctx); | |
| 211 } | |
| 212 | |
| 213 ngx_rbtree_delete(tree, &rn->node); | |
| 214 | |
| 215 ngx_resolver_free_node(r, rn); | |
| 216 } | |
| 217 } | |
| 218 | |
| 219 | |
| 1649 | 220 ngx_resolver_ctx_t * |
| 221 ngx_resolve_start(ngx_resolver_t *r, ngx_resolver_ctx_t *temp) | |
| 222 { | |
| 223 in_addr_t addr; | |
| 224 ngx_resolver_ctx_t *ctx; | |
| 225 | |
| 226 if (temp) { | |
| 227 addr = ngx_inet_addr(temp->name.data, temp->name.len); | |
| 228 | |
| 229 if (addr != INADDR_NONE) { | |
| 230 temp->resolver = r; | |
| 231 temp->state = NGX_OK; | |
| 232 temp->naddrs = 1; | |
| 233 temp->addrs = &temp->addr; | |
| 234 temp->addr = addr; | |
| 235 temp->quick = 1; | |
| 236 | |
| 237 return temp; | |
| 238 } | |
| 239 } | |
| 240 | |
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241 if (r->udp_connection == NULL) { |
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242 return NGX_NO_RESOLVER; |
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243 } |
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244 |
| 1649 | 245 ctx = ngx_resolver_calloc(r, sizeof(ngx_resolver_ctx_t)); |
| 246 | |
| 247 if (ctx) { | |
| 248 ctx->resolver = r; | |
| 249 } | |
| 250 | |
| 251 return ctx; | |
| 252 } | |
| 253 | |
| 254 | |
| 255 ngx_int_t | |
| 256 ngx_resolve_name(ngx_resolver_ctx_t *ctx) | |
| 257 { | |
| 258 ngx_int_t rc; | |
| 259 ngx_resolver_t *r; | |
| 260 | |
| 261 r = ctx->resolver; | |
| 262 | |
| 263 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 264 "resolve: \"%V\"", &ctx->name); | |
| 265 | |
| 266 if (ctx->quick) { | |
| 267 ctx->handler(ctx); | |
| 268 return NGX_OK; | |
| 269 } | |
| 270 | |
| 271 /* lock name mutex */ | |
| 272 | |
| 273 rc = ngx_resolve_name_locked(r, ctx); | |
| 274 | |
| 275 if (rc == NGX_OK) { | |
| 276 return NGX_OK; | |
| 277 } | |
| 278 | |
| 279 /* unlock name mutex */ | |
| 280 | |
| 281 if (rc == NGX_AGAIN) { | |
| 282 return NGX_OK; | |
| 283 } | |
| 284 | |
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285 /* NGX_ERROR */ |
| 1649 | 286 |
| 287 if (ctx->event) { | |
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288 ngx_resolver_free(r, ctx->event); |
| 1649 | 289 } |
| 290 | |
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291 ngx_resolver_free(r, ctx); |
| 1649 | 292 |
| 293 return NGX_ERROR; | |
| 294 } | |
| 295 | |
| 296 | |
| 297 void | |
| 298 ngx_resolve_name_done(ngx_resolver_ctx_t *ctx) | |
| 299 { | |
| 300 uint32_t hash; | |
| 301 ngx_resolver_t *r; | |
| 302 ngx_resolver_ctx_t *w, **p; | |
| 303 ngx_resolver_node_t *rn; | |
| 304 | |
| 305 r = ctx->resolver; | |
| 306 | |
| 307 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 308 "resolve name done: %i", ctx->state); | |
| 309 | |
| 310 if (ctx->quick) { | |
| 311 return; | |
| 312 } | |
| 313 | |
| 314 if (ctx->event && ctx->event->timer_set) { | |
| 315 ngx_del_timer(ctx->event); | |
| 316 } | |
| 317 | |
| 318 /* lock name mutex */ | |
| 319 | |
| 320 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
| 321 | |
| 322 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
| 323 | |
| 324 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
| 325 | |
| 326 if (rn) { | |
| 327 p = &rn->waiting; | |
| 328 w = rn->waiting; | |
| 329 | |
| 330 while (w) { | |
| 331 if (w == ctx) { | |
| 332 *p = w->next; | |
| 333 | |
| 334 goto done; | |
| 335 } | |
| 336 | |
| 337 p = &w->next; | |
| 338 w = w->next; | |
| 339 } | |
| 340 } | |
| 341 | |
| 342 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
| 343 "could not cancel %V resolving", &ctx->name); | |
| 344 } | |
| 345 | |
| 346 done: | |
| 347 | |
| 348 ngx_resolver_expire(r, &r->name_rbtree, &r->name_expire_queue); | |
| 349 | |
| 350 /* unlock name mutex */ | |
| 351 | |
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352 /* lock alloc mutex */ |
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353 |
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354 if (ctx->event) { |
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355 ngx_resolver_free_locked(r, ctx->event); |
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356 } |
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357 |
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358 ngx_resolver_free_locked(r, ctx); |
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359 |
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360 /* unlock alloc mutex */ |
| 1649 | 361 } |
| 362 | |
| 363 | |
| 364 /* NGX_RESOLVE_A only */ | |
| 365 | |
| 366 static ngx_int_t | |
| 367 ngx_resolve_name_locked(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx) | |
| 368 { | |
| 369 uint32_t hash; | |
| 370 in_addr_t addr, *addrs; | |
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371 ngx_int_t rc; |
| 1649 | 372 ngx_uint_t naddrs; |
| 373 ngx_resolver_ctx_t *next; | |
| 374 ngx_resolver_node_t *rn; | |
| 375 | |
| 376 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
| 377 | |
| 378 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
| 379 | |
| 380 if (rn) { | |
| 381 | |
| 382 if (rn->valid >= ngx_time()) { | |
| 383 | |
| 384 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
| 385 | |
| 386 ngx_queue_remove(&rn->queue); | |
| 387 | |
| 388 rn->expire = ngx_time() + r->expire; | |
| 389 | |
| 390 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 391 | |
| 392 naddrs = rn->naddrs; | |
| 393 | |
| 394 if (naddrs) { | |
| 395 | |
| 396 /* NGX_RESOLVE_A answer */ | |
| 397 | |
| 398 if (naddrs != 1) { | |
| 399 addr = 0; | |
| 400 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
| 401 naddrs * sizeof(in_addr_t)); | |
| 402 if (addrs == NULL) { | |
| 403 return NGX_ERROR; | |
| 404 } | |
| 405 | |
| 406 } else { | |
| 407 addr = rn->u.addr; | |
| 408 addrs = NULL; | |
| 409 } | |
| 410 | |
| 411 ctx->next = rn->waiting; | |
| 412 rn->waiting = NULL; | |
| 413 | |
| 414 /* unlock name mutex */ | |
| 415 | |
| 416 do { | |
| 417 ctx->state = NGX_OK; | |
| 418 ctx->naddrs = naddrs; | |
| 419 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 420 ctx->addr = addr; | |
| 421 next = ctx->next; | |
| 422 | |
| 423 ctx->handler(ctx); | |
| 424 | |
| 425 ctx = next; | |
| 426 } while (ctx); | |
| 427 | |
| 428 if (addrs) { | |
| 429 ngx_resolver_free(r, addrs); | |
| 430 } | |
| 431 | |
| 432 return NGX_OK; | |
| 433 } | |
| 434 | |
| 435 /* NGX_RESOLVE_CNAME */ | |
| 436 | |
| 1969 | 437 if (ctx->recursion++ < NGX_RESOLVER_MAX_RECURSION) { |
| 438 | |
| 439 ctx->name.len = rn->cnlen; | |
| 440 ctx->name.data = rn->u.cname; | |
| 441 | |
| 442 return ngx_resolve_name_locked(r, ctx); | |
| 443 } | |
| 444 | |
| 445 ctx->next = rn->waiting; | |
| 446 rn->waiting = NULL; | |
| 447 | |
| 448 /* unlock name mutex */ | |
| 449 | |
| 450 do { | |
| 451 ctx->state = NGX_RESOLVE_NXDOMAIN; | |
| 452 next = ctx->next; | |
| 453 | |
| 454 ctx->handler(ctx); | |
| 455 | |
| 456 ctx = next; | |
| 457 } while (ctx); | |
| 458 | |
| 459 return NGX_OK; | |
| 1649 | 460 } |
| 461 | |
| 462 if (rn->waiting) { | |
| 463 | |
| 464 ctx->next = rn->waiting; | |
| 465 rn->waiting = ctx; | |
| 3297 | 466 ctx->state = NGX_AGAIN; |
| 1649 | 467 |
| 468 return NGX_AGAIN; | |
| 469 } | |
| 470 | |
| 471 ngx_queue_remove(&rn->queue); | |
| 472 | |
| 473 /* lock alloc mutex */ | |
| 474 | |
| 475 ngx_resolver_free_locked(r, rn->query); | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
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parents:
1914
diff
changeset
|
476 rn->query = NULL; |
| 1649 | 477 |
| 478 if (rn->cnlen) { | |
| 479 ngx_resolver_free_locked(r, rn->u.cname); | |
| 480 } | |
| 481 | |
| 482 if (rn->naddrs > 1) { | |
| 483 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 484 } | |
| 485 | |
| 486 /* unlock alloc mutex */ | |
| 487 | |
| 488 } else { | |
| 489 | |
| 490 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
| 491 if (rn == NULL) { | |
| 492 return NGX_ERROR; | |
| 493 } | |
| 494 | |
| 495 rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len); | |
| 496 if (rn->name == NULL) { | |
| 497 ngx_resolver_free(r, rn); | |
| 498 return NGX_ERROR; | |
| 499 } | |
| 500 | |
| 501 rn->node.key = hash; | |
| 502 rn->nlen = (u_short) ctx->name.len; | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
503 rn->query = NULL; |
| 1649 | 504 |
| 505 ngx_rbtree_insert(&r->name_rbtree, &rn->node); | |
| 506 } | |
| 507 | |
|
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
508 rc = ngx_resolver_create_name_query(rn, ctx); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
509 |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
510 if (rc == NGX_ERROR) { |
| 1649 | 511 goto failed; |
| 512 } | |
| 513 | |
|
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
514 if (rc == NGX_DECLINED) { |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
515 ngx_rbtree_delete(&r->name_rbtree, &rn->node); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
516 |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
517 ngx_resolver_free(r, rn->query); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
518 ngx_resolver_free(r, rn->name); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
519 ngx_resolver_free(r, rn); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
520 |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
521 ctx->state = NGX_RESOLVE_NXDOMAIN; |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
522 ctx->handler(ctx); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
523 |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
524 return NGX_OK; |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
525 } |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
526 |
| 1649 | 527 if (ngx_resolver_send_query(r, rn) != NGX_OK) { |
| 528 goto failed; | |
| 529 } | |
| 530 | |
| 531 if (ctx->event == NULL) { | |
| 532 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
| 533 if (ctx->event == NULL) { | |
| 534 goto failed; | |
| 535 } | |
| 536 | |
| 537 ctx->event->handler = ngx_resolver_timeout_handler; | |
| 538 ctx->event->data = ctx; | |
| 539 ctx->event->log = r->log; | |
| 540 ctx->ident = -1; | |
| 541 | |
| 542 ngx_add_timer(ctx->event, ctx->timeout); | |
| 543 } | |
| 544 | |
| 545 if (ngx_queue_empty(&r->name_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->name_resend_queue, &rn->queue); | |
| 552 | |
| 553 rn->cnlen = 0; | |
| 554 rn->naddrs = 0; | |
| 555 rn->valid = 0; | |
| 556 rn->waiting = ctx; | |
| 557 | |
| 558 ctx->state = NGX_AGAIN; | |
| 559 | |
| 560 return NGX_AGAIN; | |
| 561 | |
| 562 failed: | |
| 563 | |
| 564 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 565 | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
566 if (rn->query) { |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
567 ngx_resolver_free(r, rn->query); |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
568 } |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
569 |
| 1649 | 570 ngx_resolver_free(r, rn->name); |
| 571 | |
| 572 ngx_resolver_free(r, rn); | |
| 573 | |
| 574 return NGX_ERROR; | |
| 575 } | |
| 583 | 576 |
| 577 | |
| 578 ngx_int_t | |
| 1649 | 579 ngx_resolve_addr(ngx_resolver_ctx_t *ctx) |
| 580 { | |
|
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
581 u_char *name; |
| 1649 | 582 ngx_resolver_t *r; |
| 583 ngx_resolver_node_t *rn; | |
| 584 | |
| 585 r = ctx->resolver; | |
| 586 | |
| 587 ctx->addr = ntohl(ctx->addr); | |
| 588 | |
| 589 /* lock addr mutex */ | |
| 590 | |
| 591 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
| 592 | |
| 593 if (rn) { | |
| 594 | |
| 595 if (rn->valid >= ngx_time()) { | |
| 596 | |
| 597 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
| 598 | |
| 599 ngx_queue_remove(&rn->queue); | |
| 600 | |
| 601 rn->expire = ngx_time() + r->expire; | |
| 602 | |
| 603 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
| 604 | |
|
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
605 name = ngx_resolver_dup(r, rn->name, rn->nlen); |
|
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
606 if (name == NULL) { |
| 1649 | 607 goto failed; |
| 608 } | |
| 609 | |
|
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
610 ctx->name.len = rn->nlen; |
|
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
611 ctx->name.data = name; |
|
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
612 |
| 1649 | 613 /* unlock addr mutex */ |
| 614 | |
| 615 ctx->state = NGX_OK; | |
| 616 | |
| 617 ctx->handler(ctx); | |
| 618 | |
|
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
619 ngx_resolver_free(r, name); |
| 1649 | 620 |
| 621 return NGX_OK; | |
| 622 } | |
| 623 | |
| 624 if (rn->waiting) { | |
| 625 | |
| 626 ctx->next = rn->waiting; | |
| 627 rn->waiting = ctx; | |
| 3297 | 628 ctx->state = NGX_AGAIN; |
| 1649 | 629 |
|
2487
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
630 /* unlock addr mutex */ |
|
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
631 |
|
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
632 return NGX_OK; |
| 1649 | 633 } |
| 634 | |
| 635 ngx_queue_remove(&rn->queue); | |
| 636 | |
| 637 ngx_resolver_free(r, rn->query); | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
638 rn->query = NULL; |
| 1649 | 639 |
| 640 } else { | |
| 641 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
| 642 if (rn == NULL) { | |
| 643 goto failed; | |
| 644 } | |
| 645 | |
| 646 rn->node.key = ctx->addr; | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
647 rn->query = NULL; |
| 1649 | 648 |
| 649 ngx_rbtree_insert(&r->addr_rbtree, &rn->node); | |
| 650 } | |
| 651 | |
| 652 if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) { | |
| 653 goto failed; | |
| 654 } | |
| 655 | |
| 656 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
| 657 goto failed; | |
| 658 } | |
| 659 | |
| 660 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
| 661 if (ctx->event == NULL) { | |
| 662 goto failed; | |
| 663 } | |
| 664 | |
| 665 ctx->event->handler = ngx_resolver_timeout_handler; | |
| 666 ctx->event->data = ctx; | |
| 667 ctx->event->log = r->log; | |
| 668 ctx->ident = -1; | |
| 669 | |
| 670 ngx_add_timer(ctx->event, ctx->timeout); | |
| 671 | |
| 672 if (ngx_queue_empty(&r->addr_resend_queue)) { | |
| 673 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
| 674 } | |
| 675 | |
| 676 rn->expire = ngx_time() + r->resend_timeout; | |
| 677 | |
| 678 ngx_queue_insert_head(&r->addr_resend_queue, &rn->queue); | |
| 679 | |
| 680 rn->cnlen = 0; | |
| 681 rn->naddrs = 0; | |
| 682 rn->name = NULL; | |
| 683 rn->nlen = 0; | |
| 684 rn->valid = 0; | |
| 685 rn->waiting = ctx; | |
| 686 | |
| 687 /* unlock addr mutex */ | |
| 688 | |
| 689 ctx->state = NGX_AGAIN; | |
| 690 | |
| 691 return NGX_OK; | |
| 692 | |
| 693 failed: | |
| 694 | |
| 695 if (rn) { | |
| 696 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 697 | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
698 if (rn->query) { |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
699 ngx_resolver_free(r, rn->query); |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
700 } |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
701 |
| 1649 | 702 ngx_resolver_free(r, rn); |
| 703 } | |
| 704 | |
| 705 /* unlock addr mutex */ | |
| 706 | |
| 707 if (ctx->event) { | |
|
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
708 ngx_resolver_free(r, ctx->event); |
| 1649 | 709 } |
| 710 | |
|
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
711 ngx_resolver_free(r, ctx); |
| 1649 | 712 |
| 713 return NGX_ERROR; | |
| 714 } | |
| 715 | |
| 716 | |
| 717 void | |
| 718 ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx) | |
| 719 { | |
| 720 in_addr_t addr; | |
| 721 ngx_resolver_t *r; | |
| 722 ngx_resolver_ctx_t *w, **p; | |
| 723 ngx_resolver_node_t *rn; | |
| 724 | |
| 725 r = ctx->resolver; | |
| 726 | |
| 727 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 728 "resolve addr done: %i", ctx->state); | |
| 729 | |
| 730 if (ctx->event && ctx->event->timer_set) { | |
| 731 ngx_del_timer(ctx->event); | |
| 732 } | |
| 733 | |
| 734 /* lock addr mutex */ | |
| 735 | |
| 736 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
| 737 | |
| 738 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
| 739 | |
| 740 if (rn) { | |
| 741 p = &rn->waiting; | |
| 742 w = rn->waiting; | |
| 743 | |
| 744 while (w) { | |
| 745 if (w == ctx) { | |
| 746 *p = w->next; | |
| 747 | |
| 748 goto done; | |
| 749 } | |
| 750 | |
| 751 p = &w->next; | |
| 752 w = w->next; | |
| 753 } | |
| 754 } | |
| 755 | |
| 756 addr = ntohl(ctx->addr); | |
| 757 | |
| 758 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
| 759 "could not cancel %ud.%ud.%ud.%ud resolving", | |
| 760 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 761 (addr >> 8) & 0xff, addr & 0xff); | |
| 762 } | |
| 763 | |
| 764 done: | |
| 765 | |
| 766 ngx_resolver_expire(r, &r->addr_rbtree, &r->addr_expire_queue); | |
| 767 | |
| 768 /* unlock addr mutex */ | |
| 769 | |
|
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
770 /* lock alloc mutex */ |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
771 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
772 if (ctx->event) { |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
773 ngx_resolver_free_locked(r, ctx->event); |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
774 } |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
775 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
776 ngx_resolver_free_locked(r, ctx); |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
777 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
778 /* unlock alloc mutex */ |
| 1649 | 779 } |
| 780 | |
| 781 | |
| 782 static void | |
| 783 ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 784 { | |
| 785 time_t now; | |
| 786 ngx_uint_t i; | |
| 787 ngx_queue_t *q; | |
| 788 ngx_resolver_node_t *rn; | |
| 789 | |
| 790 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire"); | |
| 791 | |
| 792 now = ngx_time(); | |
| 793 | |
| 794 for (i = 0; i < 2; i++) { | |
| 795 if (ngx_queue_empty(queue)) { | |
| 796 return; | |
| 797 } | |
| 798 | |
| 799 q = ngx_queue_last(queue); | |
| 800 | |
| 801 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 802 | |
| 803 if (now <= rn->expire) { | |
| 804 return; | |
| 805 } | |
| 806 | |
| 1774 | 807 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, |
| 808 "resolver expire \"%*s\"", (size_t) rn->nlen, rn->name); | |
| 1649 | 809 |
| 810 ngx_queue_remove(q); | |
| 811 | |
| 812 ngx_rbtree_delete(tree, &rn->node); | |
| 813 | |
| 814 ngx_resolver_free_node(r, rn); | |
| 815 } | |
| 816 } | |
| 817 | |
| 818 | |
| 819 static ngx_int_t | |
| 820 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 821 { | |
| 822 ssize_t n; | |
| 823 ngx_udp_connection_t *uc; | |
| 824 | |
| 825 uc = r->udp_connection; | |
| 826 | |
| 827 if (uc->connection == NULL) { | |
| 4514 | 828 |
| 829 uc->log = *r->log; | |
| 830 uc->log.handler = ngx_resolver_log_error; | |
| 831 uc->log.data = uc; | |
| 832 uc->log.action = "resolving"; | |
| 833 | |
| 1649 | 834 if (ngx_udp_connect(uc) != NGX_OK) { |
| 835 return NGX_ERROR; | |
| 836 } | |
| 837 | |
| 838 uc->connection->data = r; | |
| 839 uc->connection->read->handler = ngx_resolver_read_response; | |
| 1906 | 840 uc->connection->read->resolver = 1; |
| 1649 | 841 } |
| 842 | |
| 843 n = ngx_send(uc->connection, rn->query, rn->qlen); | |
| 844 | |
| 845 if (n == -1) { | |
| 846 return NGX_ERROR; | |
| 847 } | |
| 848 | |
| 849 if ((size_t) n != (size_t) rn->qlen) { | |
|
3408
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|
850 ngx_log_error(NGX_LOG_CRIT, &uc->log, 0, "send() incomplete"); |
| 1649 | 851 return NGX_ERROR; |
| 852 } | |
| 853 | |
| 854 return NGX_OK; | |
| 855 } | |
| 856 | |
| 857 | |
| 858 static void | |
| 859 ngx_resolver_resend_handler(ngx_event_t *ev) | |
| 860 { | |
| 861 time_t timer, atimer, ntimer; | |
| 862 ngx_resolver_t *r; | |
| 863 | |
| 864 r = ev->data; | |
| 865 | |
| 866 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 867 "resolver resend handler"); | |
| 868 | |
| 869 /* lock name mutex */ | |
| 870 | |
| 871 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue); | |
| 872 | |
| 873 /* unlock name mutex */ | |
| 874 | |
| 875 /* lock addr mutex */ | |
| 876 | |
| 877 atimer = ngx_resolver_resend(r, &r->addr_rbtree, &r->addr_resend_queue); | |
|
1679
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diff
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|
878 |
| 1649 | 879 /* unlock addr mutex */ |
| 880 | |
| 881 if (ntimer == 0) { | |
| 882 timer = atimer; | |
| 883 | |
| 884 } else if (atimer == 0) { | |
| 885 timer = ntimer; | |
| 886 | |
| 887 } else { | |
| 888 timer = (atimer < ntimer) ? atimer : ntimer; | |
| 889 } | |
| 890 | |
| 891 if (timer) { | |
| 892 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000)); | |
| 893 } | |
| 894 } | |
| 895 | |
| 896 | |
| 897 static time_t | |
| 898 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 899 { | |
| 900 time_t now; | |
| 901 ngx_queue_t *q; | |
| 902 ngx_resolver_node_t *rn; | |
| 903 | |
| 904 now = ngx_time(); | |
| 905 | |
| 906 for ( ;; ) { | |
| 907 if (ngx_queue_empty(queue)) { | |
| 908 return 0; | |
| 909 } | |
| 910 | |
| 911 q = ngx_queue_last(queue); | |
| 912 | |
| 913 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 914 | |
| 915 if (now < rn->expire) { | |
| 916 return rn->expire - now; | |
| 917 } | |
| 918 | |
| 1774 | 919 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, |
| 920 "resolver resend \"%*s\" %p", | |
| 921 (size_t) rn->nlen, rn->name, rn->waiting); | |
| 1649 | 922 |
| 923 ngx_queue_remove(q); | |
| 924 | |
| 925 if (rn->waiting) { | |
| 926 | |
| 927 if (ngx_resolver_send_query(r, rn) == NGX_OK) { | |
| 928 | |
| 929 rn->expire = now + r->resend_timeout; | |
| 930 | |
| 931 ngx_queue_insert_head(queue, &rn->queue); | |
| 932 } | |
|
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|
933 |
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|
934 continue; |
| 1649 | 935 } |
| 936 | |
| 937 ngx_rbtree_delete(tree, &rn->node); | |
| 938 | |
| 939 ngx_resolver_free_node(r, rn); | |
| 940 } | |
| 941 } | |
| 942 | |
| 943 | |
| 944 static void | |
| 945 ngx_resolver_read_response(ngx_event_t *rev) | |
| 946 { | |
| 947 ssize_t n; | |
| 948 ngx_connection_t *c; | |
| 949 u_char buf[NGX_RESOLVER_UDP_SIZE]; | |
| 950 | |
| 951 c = rev->data; | |
| 952 | |
| 953 do { | |
| 1689 | 954 n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE); |
| 955 | |
| 956 if (n < 0) { | |
| 1649 | 957 return; |
| 958 } | |
| 959 | |
| 960 ngx_resolver_process_response(c->data, buf, n); | |
| 961 | |
| 962 } while (rev->ready); | |
| 963 } | |
| 964 | |
| 965 | |
| 966 static void | |
| 967 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n) | |
| 968 { | |
| 969 char *err; | |
| 970 size_t len; | |
|
2282
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|
971 ngx_uint_t i, times, ident, qident, flags, code, nqs, nan, |
|
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|
972 qtype, qclass; |
|
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|
973 ngx_queue_t *q; |
| 1649 | 974 ngx_resolver_qs_t *qs; |
|
2282
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|
975 ngx_resolver_node_t *rn; |
| 1649 | 976 ngx_resolver_query_t *query; |
| 977 | |
|
2281
5004229420a6
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diff
changeset
|
978 if ((size_t) n < sizeof(ngx_resolver_query_t)) { |
| 1649 | 979 goto short_response; |
| 980 } | |
| 981 | |
| 982 query = (ngx_resolver_query_t *) buf; | |
| 983 | |
| 984 ident = (query->ident_hi << 8) + query->ident_lo; | |
| 985 flags = (query->flags_hi << 8) + query->flags_lo; | |
| 986 nqs = (query->nqs_hi << 8) + query->nqs_lo; | |
| 987 nan = (query->nan_hi << 8) + query->nan_lo; | |
| 988 | |
| 989 ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0, | |
|
1967
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diff
changeset
|
990 "resolver DNS response %ui fl:%04Xui %ui/%ui/%ui/%ui", |
| 1649 | 991 ident, flags, nqs, nan, |
| 992 (query->nns_hi << 8) + query->nns_lo, | |
| 993 (query->nar_hi << 8) + query->nar_lo); | |
| 994 | |
| 995 if (!(flags & 0x8000)) { | |
| 996 ngx_log_error(r->log_level, r->log, 0, | |
|
1967
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diff
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|
997 "invalid DNS response %ui fl:%04Xui", ident, flags); |
| 1649 | 998 return; |
| 999 } | |
| 1000 | |
| 1001 code = flags & 0x7f; | |
| 1002 | |
|
2282
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2281
diff
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|
1003 if (code == NGX_RESOLVE_FORMERR) { |
|
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diff
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|
1004 |
|
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|
1005 times = 0; |
|
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|
1006 |
|
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|
1007 for (q = ngx_queue_head(&r->name_resend_queue); |
|
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|
1008 q != ngx_queue_sentinel(&r->name_resend_queue) || times++ < 100; |
|
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diff
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|
1009 q = ngx_queue_next(q)) |
|
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parents:
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diff
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|
1010 { |
|
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parents:
2281
diff
changeset
|
1011 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); |
|
ec97eb9a8038
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parents:
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diff
changeset
|
1012 qident = (rn->query[0] << 8) + rn->query[1]; |
|
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parents:
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diff
changeset
|
1013 |
|
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parents:
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diff
changeset
|
1014 if (qident == ident) { |
|
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diff
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|
1015 ngx_log_error(r->log_level, r->log, 0, |
|
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diff
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|
1016 "DNS error (%ui: %s), query id:%ui, name:\"%*s\"", |
|
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diff
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|
1017 code, ngx_resolver_strerror(code), ident, |
|
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diff
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|
1018 rn->nlen, rn->name); |
|
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2281
diff
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|
1019 return; |
|
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diff
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|
1020 } |
|
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diff
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|
1021 } |
|
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diff
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|
1022 |
|
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diff
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|
1023 goto dns_error; |
|
ec97eb9a8038
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2281
diff
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|
1024 } |
|
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diff
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|
1025 |
|
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parents:
2281
diff
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|
1026 if (code > NGX_RESOLVE_REFUSED) { |
|
ec97eb9a8038
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2281
diff
changeset
|
1027 goto dns_error; |
| 1649 | 1028 } |
| 1029 | |
| 1030 if (nqs != 1) { | |
| 1031 err = "invalid number of questions in DNS response"; | |
| 1032 goto done; | |
| 1033 } | |
| 1034 | |
| 1035 i = sizeof(ngx_resolver_query_t); | |
| 1036 | |
| 1037 while (i < (ngx_uint_t) n) { | |
| 1038 if (buf[i] == '\0') { | |
| 1039 goto found; | |
| 1040 } | |
| 1041 | |
| 1042 len = buf[i]; | |
| 1043 i += 1 + len; | |
| 1044 } | |
| 1045 | |
| 1046 goto short_response; | |
| 1047 | |
| 1048 found: | |
| 1049 | |
| 1050 if (i++ == 0) { | |
| 1051 err = "zero-length domain name in DNS response"; | |
| 1052 goto done; | |
| 1053 } | |
| 1054 | |
| 1055 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t)) | |
| 1056 > (ngx_uint_t) n) | |
| 1057 { | |
| 1058 goto short_response; | |
| 1059 } | |
| 1060 | |
| 1061 qs = (ngx_resolver_qs_t *) &buf[i]; | |
| 1062 | |
| 1063 qtype = (qs->type_hi << 8) + qs->type_lo; | |
| 1064 qclass = (qs->class_hi << 8) + qs->class_lo; | |
| 1065 | |
| 1066 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
|
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1067 "resolver DNS response qt:%ui cl:%ui", qtype, qclass); |
| 1649 | 1068 |
| 1069 if (qclass != 1) { | |
| 1070 ngx_log_error(r->log_level, r->log, 0, | |
|
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1071 "unknown query class %ui in DNS response", qclass); |
| 1649 | 1072 return; |
| 1073 } | |
| 1074 | |
| 1075 switch (qtype) { | |
| 1076 | |
| 1077 case NGX_RESOLVE_A: | |
| 1078 | |
| 1079 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
|
1080 i + sizeof(ngx_resolver_qs_t)); |
| 1649 | 1081 |
| 1082 break; | |
| 1083 | |
| 1084 case NGX_RESOLVE_PTR: | |
| 1085 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1086 ngx_resolver_process_ptr(r, buf, n, ident, code, nan); |
| 1649 | 1087 |
| 1088 break; | |
| 1089 | |
| 1090 default: | |
| 1091 ngx_log_error(r->log_level, r->log, 0, | |
|
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1092 "unknown query type %ui in DNS response", qtype); |
| 1649 | 1093 return; |
| 1094 } | |
| 1095 | |
| 1096 return; | |
| 1097 | |
| 1098 short_response: | |
| 1099 | |
| 1100 err = "short dns response"; | |
| 1101 | |
| 1102 done: | |
| 1103 | |
| 1104 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1105 | |
| 1106 return; | |
|
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2281
diff
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|
1107 |
|
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diff
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|
1108 dns_error: |
|
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diff
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|
1109 |
|
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|
1110 ngx_log_error(r->log_level, r->log, 0, |
|
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2281
diff
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|
1111 "DNS error (%ui: %s), query id:%ui", |
|
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diff
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|
1112 code, ngx_resolver_strerror(code), ident); |
|
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diff
changeset
|
1113 return; |
| 1649 | 1114 } |
| 1115 | |
| 1116 | |
| 1117 static void | |
| 1118 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last, | |
| 1119 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans) | |
| 583 | 1120 { |
| 1649 | 1121 char *err; |
| 1122 u_char *cname; | |
| 1123 size_t len; | |
| 1124 uint32_t hash; | |
| 1125 in_addr_t addr, *addrs; | |
| 1126 ngx_str_t name; | |
| 1127 ngx_uint_t qtype, qident, naddrs, a, i, n, start; | |
| 1128 ngx_resolver_an_t *an; | |
| 1129 ngx_resolver_ctx_t *ctx, *next; | |
| 1130 ngx_resolver_node_t *rn; | |
| 1131 | |
| 1132 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) { | |
| 1133 return; | |
| 1134 } | |
| 1135 | |
| 1136 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); | |
| 1137 | |
| 1138 hash = ngx_crc32_short(name.data, name.len); | |
| 1139 | |
| 1140 /* lock name mutex */ | |
| 1141 | |
| 1142 rn = ngx_resolver_lookup_name(r, &name, hash); | |
| 1143 | |
| 1144 if (rn == NULL || rn->query == NULL) { | |
| 1145 ngx_log_error(r->log_level, r->log, 0, | |
| 1146 "unexpected response for %V", &name); | |
| 1147 goto failed; | |
| 1148 } | |
| 1149 | |
| 1150 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 1151 | |
| 1152 if (ident != qident) { | |
| 1153 ngx_log_error(r->log_level, r->log, 0, | |
|
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1154 "wrong ident %ui response for %V, expect %ui", |
| 1649 | 1155 ident, &name, qident); |
| 1156 goto failed; | |
| 1157 } | |
| 1158 | |
| 3139 | 1159 ngx_resolver_free(r, name.data); |
| 1160 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1161 if (code == 0 && nan == 0) { |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1162 code = 3; /* NXDOMAIN */ |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1163 } |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1164 |
| 1649 | 1165 if (code) { |
| 1166 next = rn->waiting; | |
| 1167 rn->waiting = NULL; | |
| 1168 | |
| 1169 ngx_queue_remove(&rn->queue); | |
| 1170 | |
| 1171 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 1172 | |
| 1173 ngx_resolver_free_node(r, rn); | |
| 1174 | |
| 1175 /* unlock name mutex */ | |
| 1176 | |
| 1177 while (next) { | |
| 1178 ctx = next; | |
| 1179 ctx->state = code; | |
| 1180 next = ctx->next; | |
| 1181 | |
| 1182 ctx->handler(ctx); | |
| 1183 } | |
| 1184 | |
| 1185 return; | |
| 1186 } | |
| 1187 | |
| 1188 i = ans; | |
| 1189 naddrs = 0; | |
| 1190 addr = 0; | |
| 1191 addrs = NULL; | |
| 1192 cname = NULL; | |
| 1193 qtype = 0; | |
| 1194 | |
| 1195 for (a = 0; a < nan; a++) { | |
| 1196 | |
| 1197 start = i; | |
| 1198 | |
| 1199 while (i < last) { | |
| 1200 | |
| 1201 if (buf[i] & 0xc0) { | |
| 1202 i += 2; | |
| 1203 goto found; | |
| 1204 } | |
| 1205 | |
| 1206 if (buf[i] == 0) { | |
| 1207 i++; | |
| 1208 goto test_length; | |
| 1209 } | |
| 1210 | |
| 1211 i += 1 + buf[i]; | |
| 1212 } | |
| 1213 | |
| 1214 goto short_response; | |
| 1215 | |
| 1216 test_length: | |
| 1217 | |
| 1218 if (i - start < 2) { | |
| 1219 err = "invalid name in dns response"; | |
| 1220 goto invalid; | |
| 1221 } | |
| 1222 | |
| 1223 found: | |
| 1224 | |
| 1225 if (i + sizeof(ngx_resolver_an_t) >= last) { | |
| 1226 goto short_response; | |
| 1227 } | |
| 1228 | |
| 1229 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1230 | |
| 1231 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1232 len = (an->len_hi << 8) + an->len_lo; | |
| 1233 | |
| 1234 if (qtype == NGX_RESOLVE_A) { | |
| 1235 | |
| 1236 i += sizeof(ngx_resolver_an_t); | |
| 1237 | |
| 1238 if (i + len > last) { | |
| 1239 goto short_response; | |
| 1240 } | |
| 1241 | |
| 1242 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1243 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1244 | |
| 1245 naddrs++; | |
| 1246 | |
| 1247 i += len; | |
| 1248 | |
| 1249 } else if (qtype == NGX_RESOLVE_CNAME) { | |
| 1250 cname = &buf[i] + sizeof(ngx_resolver_an_t); | |
| 1251 i += sizeof(ngx_resolver_an_t) + len; | |
| 1965 | 1252 |
| 1253 } else if (qtype == NGX_RESOLVE_DNAME) { | |
| 1254 i += sizeof(ngx_resolver_an_t) + len; | |
| 1966 | 1255 |
| 1256 } else { | |
| 1257 ngx_log_error(r->log_level, r->log, 0, | |
| 1258 "unexpected qtype %ui", qtype); | |
| 1649 | 1259 } |
| 1260 } | |
| 1261 | |
| 1262 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1263 "resolver naddrs:%ui cname:%p", naddrs, cname); | |
| 1264 | |
| 1265 if (naddrs) { | |
| 1266 | |
| 1267 if (naddrs == 1) { | |
| 1268 rn->u.addr = addr; | |
| 1269 | |
| 1270 } else { | |
| 1271 | |
| 1272 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t)); | |
| 1273 if (addrs == NULL) { | |
| 1274 return; | |
| 1275 } | |
| 1276 | |
| 1277 n = 0; | |
| 1278 i = ans; | |
| 1279 | |
| 1280 for (a = 0; a < nan; a++) { | |
| 1281 | |
| 1282 for ( ;; ) { | |
| 1283 | |
| 1284 if (buf[i] & 0xc0) { | |
| 1285 i += 2; | |
| 1286 goto ok; | |
| 1287 } | |
| 1288 | |
| 1289 if (buf[i] == 0) { | |
| 1290 i++; | |
| 1291 goto ok; | |
| 1292 } | |
| 1293 | |
| 1294 i += 1 + buf[i]; | |
| 1295 } | |
| 1296 | |
| 1297 ok: | |
| 1298 | |
| 1299 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1300 | |
| 1301 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1302 len = (an->len_hi << 8) + an->len_lo; | |
| 1303 | |
| 1304 i += sizeof(ngx_resolver_an_t); | |
| 1305 | |
| 1306 if (qtype == NGX_RESOLVE_A) { | |
| 1307 | |
| 1308 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1309 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1310 | |
| 1311 if (n == naddrs) { | |
| 1312 break; | |
| 1313 } | |
| 1314 } | |
| 1315 | |
| 1316 i += len; | |
| 1317 } | |
| 1318 | |
| 1319 rn->u.addrs = addrs; | |
| 1320 | |
| 1321 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
| 1322 naddrs * sizeof(in_addr_t)); | |
| 1323 if (addrs == NULL) { | |
| 1324 return; | |
| 1325 } | |
| 1326 } | |
| 1327 | |
| 1328 rn->naddrs = (u_short) naddrs; | |
| 1329 | |
| 1330 ngx_queue_remove(&rn->queue); | |
| 1331 | |
| 1332 rn->valid = ngx_time() + r->valid; | |
| 1333 rn->expire = ngx_time() + r->expire; | |
| 1334 | |
| 1335 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1336 | |
| 1337 next = rn->waiting; | |
| 1338 rn->waiting = NULL; | |
| 1339 | |
| 1340 /* unlock name mutex */ | |
| 1341 | |
| 1342 while (next) { | |
| 1343 ctx = next; | |
| 1344 ctx->state = NGX_OK; | |
| 1345 ctx->naddrs = naddrs; | |
| 1346 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 1347 ctx->addr = addr; | |
| 1348 next = ctx->next; | |
| 1349 | |
| 1350 ctx->handler(ctx); | |
| 1351 } | |
| 1352 | |
|
2483
29494780d978
free addrs only it has been allocated before: non single address
Igor Sysoev <igor@sysoev.ru>
parents:
2482
diff
changeset
|
1353 if (naddrs > 1) { |
| 1649 | 1354 ngx_resolver_free(r, addrs); |
| 1355 } | |
| 1356 | |
| 1357 return; | |
| 1358 | |
| 1359 } else if (cname) { | |
| 1360 | |
| 1361 /* CNAME only */ | |
| 1362 | |
| 1363 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) { | |
| 1364 return; | |
| 1365 } | |
| 1366 | |
| 1367 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1368 "resolver cname:\"%V\"", &name); | |
| 1369 | |
|
1741
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1370 ngx_queue_remove(&rn->queue); |
|
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1371 |
| 1649 | 1372 rn->cnlen = (u_short) name.len; |
| 1373 rn->u.cname = name.data; | |
| 1374 rn->valid = ngx_time() + r->valid; | |
| 1375 rn->expire = ngx_time() + r->expire; | |
| 1376 | |
| 1377 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1378 | |
| 1379 ctx = rn->waiting; | |
| 1380 rn->waiting = NULL; | |
| 1381 | |
| 1382 if (ctx) { | |
| 1383 ctx->name = name; | |
| 1384 | |
| 1385 (void) ngx_resolve_name_locked(r, ctx); | |
| 1386 } | |
| 1387 | |
| 1388 return; | |
| 1389 } | |
| 1390 | |
| 1391 ngx_log_error(r->log_level, r->log, 0, | |
|
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1392 "no A or CNAME types in DNS responses, unknown query type: %ui", |
|
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1393 qtype); |
| 1649 | 1394 return; |
| 1395 | |
| 1396 short_response: | |
| 1397 | |
| 1398 err = "short dns response"; | |
| 1399 | |
| 1400 invalid: | |
| 1401 | |
| 1402 /* unlock name mutex */ | |
| 1403 | |
| 1404 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1405 | |
| 1406 return; | |
| 1407 | |
| 1408 failed: | |
| 1409 | |
| 1410 /* unlock name mutex */ | |
| 1411 | |
| 3139 | 1412 ngx_resolver_free(r, name.data); |
| 1413 | |
| 1649 | 1414 return; |
| 1415 } | |
| 1416 | |
| 1417 | |
| 1418 static void | |
| 1419 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
|
1420 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan) |
| 1649 | 1421 { |
| 1422 char *err; | |
| 1423 size_t len; | |
| 1424 in_addr_t addr; | |
| 1425 ngx_int_t digit; | |
| 1426 ngx_str_t name; | |
|
3902
159b58f9c0bd
fix building by gcc 4.6 without --with-debug
Igor Sysoev <igor@sysoev.ru>
parents:
3763
diff
changeset
|
1427 ngx_uint_t i, mask, qident; |
| 1649 | 1428 ngx_resolver_an_t *an; |
| 1429 ngx_resolver_ctx_t *ctx, *next; | |
| 1430 ngx_resolver_node_t *rn; | |
| 1431 | |
| 1432 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) { | |
| 1433 goto invalid_in_addr_arpa; | |
| 1434 } | |
| 1435 | |
| 1436 addr = 0; | |
| 1437 i = 12; | |
| 1438 | |
| 1439 for (mask = 0; mask < 32; mask += 8) { | |
| 1440 len = buf[i++]; | |
| 1441 | |
| 1442 digit = ngx_atoi(&buf[i], len); | |
| 1443 if (digit == NGX_ERROR || digit > 255) { | |
| 1444 goto invalid_in_addr_arpa; | |
| 1445 } | |
| 1446 | |
| 1447 addr += digit << mask; | |
| 1448 i += len; | |
| 1449 } | |
| 1450 | |
| 1451 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) { | |
| 1452 goto invalid_in_addr_arpa; | |
| 1453 } | |
| 1454 | |
| 1455 /* lock addr mutex */ | |
| 1456 | |
| 1457 rn = ngx_resolver_lookup_addr(r, addr); | |
| 1458 | |
| 1459 if (rn == NULL || rn->query == NULL) { | |
| 1460 ngx_log_error(r->log_level, r->log, 0, | |
| 1461 "unexpected response for %ud.%ud.%ud.%ud", | |
| 1462 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 1463 (addr >> 8) & 0xff, addr & 0xff); | |
| 1464 goto failed; | |
| 1465 } | |
| 1466 | |
| 1467 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 1468 | |
| 1469 if (ident != qident) { | |
| 1470 ngx_log_error(r->log_level, r->log, 0, | |
|
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1471 "wrong ident %ui response for %ud.%ud.%ud.%ud, expect %ui", |
|
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1472 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff, |
|
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1473 (addr >> 8) & 0xff, addr & 0xff, qident); |
| 1649 | 1474 goto failed; |
| 1475 } | |
| 1476 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1477 if (code == 0 && nan == 0) { |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1478 code = 3; /* NXDOMAIN */ |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1479 } |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1480 |
| 1649 | 1481 if (code) { |
| 1482 next = rn->waiting; | |
| 1483 rn->waiting = NULL; | |
| 1484 | |
| 1485 ngx_queue_remove(&rn->queue); | |
| 1486 | |
| 1487 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 1488 | |
| 1489 ngx_resolver_free_node(r, rn); | |
| 1490 | |
| 1491 /* unlock addr mutex */ | |
| 1492 | |
| 1493 while (next) { | |
| 1494 ctx = next; | |
| 1495 ctx->state = code; | |
| 1496 next = ctx->next; | |
| 1497 | |
| 1498 ctx->handler(ctx); | |
| 1499 } | |
| 1500 | |
| 1501 return; | |
| 1502 } | |
| 1503 | |
| 1504 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t); | |
| 1505 | |
| 1506 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) { | |
| 1507 goto short_response; | |
| 1508 } | |
| 1509 | |
| 1510 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */ | |
| 1511 | |
| 1512 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) { | |
| 1513 err = "invalid in-addr.arpa name in DNS response"; | |
| 1514 goto invalid; | |
| 1515 } | |
| 1516 | |
| 1517 an = (ngx_resolver_an_t *) &buf[i + 2]; | |
| 1518 | |
| 1519 len = (an->len_hi << 8) + an->len_lo; | |
| 1520 | |
| 1521 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, | |
|
3902
159b58f9c0bd
fix building by gcc 4.6 without --with-debug
Igor Sysoev <igor@sysoev.ru>
parents:
3763
diff
changeset
|
1522 "resolver qt:%ui cl:%ui len:%uz", |
|
159b58f9c0bd
fix building by gcc 4.6 without --with-debug
Igor Sysoev <igor@sysoev.ru>
parents:
3763
diff
changeset
|
1523 (an->type_hi << 8) + an->type_lo, |
|
159b58f9c0bd
fix building by gcc 4.6 without --with-debug
Igor Sysoev <igor@sysoev.ru>
parents:
3763
diff
changeset
|
1524 (an->class_hi << 8) + an->class_lo, len); |
| 1649 | 1525 |
| 1526 i += 2 + sizeof(ngx_resolver_an_t); | |
| 1527 | |
| 1528 if (i + len > (ngx_uint_t) n) { | |
| 1529 goto short_response; | |
| 1530 } | |
| 1531 | |
| 1532 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) { | |
| 1533 return; | |
| 1534 } | |
| 1535 | |
| 1536 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name); | |
| 1537 | |
|
2486
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1538 if (name.len != (size_t) rn->nlen |
|
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1539 || ngx_strncmp(name.data, rn->name, name.len) != 0) |
| 1649 | 1540 { |
|
2482
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1541 if (rn->nlen) { |
|
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1542 ngx_resolver_free(r, rn->name); |
|
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1543 } |
|
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1544 |
|
2490
1c87647b7ca5
fix building by msvc, introduced in r2487
Igor Sysoev <igor@sysoev.ru>
parents:
2487
diff
changeset
|
1545 rn->nlen = (u_short) name.len; |
| 1649 | 1546 rn->name = name.data; |
| 1547 | |
|
2486
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1548 name.data = ngx_resolver_dup(r, rn->name, name.len); |
| 1649 | 1549 if (name.data == NULL) { |
| 1550 goto failed; | |
| 1551 } | |
| 1552 } | |
| 1553 | |
| 1554 ngx_queue_remove(&rn->queue); | |
| 1555 | |
| 1556 rn->valid = ngx_time() + r->valid; | |
| 1557 rn->expire = ngx_time() + r->expire; | |
| 1558 | |
| 1559 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
| 1560 | |
| 1561 next = rn->waiting; | |
| 1562 rn->waiting = NULL; | |
| 1563 | |
| 1564 /* unlock addr mutex */ | |
| 1565 | |
| 1566 while (next) { | |
| 1567 ctx = next; | |
| 1568 ctx->state = NGX_OK; | |
| 1569 ctx->name = name; | |
| 1570 next = ctx->next; | |
| 1571 | |
| 1572 ctx->handler(ctx); | |
| 1573 } | |
| 1574 | |
| 1575 ngx_resolver_free(r, name.data); | |
| 1576 | |
| 1577 return; | |
| 1578 | |
| 1579 invalid_in_addr_arpa: | |
| 1580 | |
| 1581 ngx_log_error(r->log_level, r->log, 0, | |
| 1582 "invalid in-addr.arpa name in DNS response"); | |
| 1583 return; | |
| 1584 | |
| 1585 short_response: | |
| 1586 | |
| 1587 err = "short DNS response"; | |
| 1588 | |
| 1589 invalid: | |
| 1590 | |
| 1591 /* unlock addr mutex */ | |
| 1592 | |
| 1593 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1594 | |
| 1595 return; | |
| 1596 | |
| 1597 failed: | |
| 1598 | |
| 1599 /* unlock addr mutex */ | |
| 1600 | |
| 1601 return; | |
| 1602 } | |
| 1603 | |
| 1604 | |
| 1605 static ngx_resolver_node_t * | |
| 1606 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) | |
| 1607 { | |
| 1608 ngx_int_t rc; | |
| 1609 ngx_rbtree_node_t *node, *sentinel; | |
| 1610 ngx_resolver_node_t *rn; | |
| 1611 | |
| 1612 node = r->name_rbtree.root; | |
| 1613 sentinel = r->name_rbtree.sentinel; | |
| 1614 | |
| 1615 while (node != sentinel) { | |
| 1616 | |
| 1617 if (hash < node->key) { | |
| 1618 node = node->left; | |
| 1619 continue; | |
| 1620 } | |
| 1621 | |
| 1622 if (hash > node->key) { | |
| 1623 node = node->right; | |
| 1624 continue; | |
| 1625 } | |
| 1626 | |
| 1627 /* hash == node->key */ | |
| 1628 | |
| 1629 do { | |
| 1630 rn = (ngx_resolver_node_t *) node; | |
| 1631 | |
|
3143
ab6258e18099
fix resolver cache rbtree comparison
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diff
changeset
|
1632 rc = ngx_memn2cmp(name->data, rn->name, name->len, rn->nlen); |
| 1649 | 1633 |
| 1634 if (rc == 0) { | |
| 1635 return rn; | |
| 1636 } | |
| 1637 | |
| 1638 node = (rc < 0) ? node->left : node->right; | |
| 1639 | |
| 1640 } while (node != sentinel && hash == node->key); | |
| 1641 | |
| 1642 break; | |
| 1643 } | |
| 1644 | |
| 1645 /* not found */ | |
| 1646 | |
| 1647 return NULL; | |
| 1648 } | |
| 1649 | |
| 1650 | |
| 1651 static ngx_resolver_node_t * | |
| 1652 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr) | |
| 1653 { | |
| 1654 ngx_rbtree_node_t *node, *sentinel; | |
| 1655 | |
| 1656 node = r->addr_rbtree.root; | |
| 1657 sentinel = r->addr_rbtree.sentinel; | |
| 1658 | |
| 1659 while (node != sentinel) { | |
| 1660 | |
| 1661 if (addr < node->key) { | |
| 1662 node = node->left; | |
| 1663 continue; | |
| 1664 } | |
| 1665 | |
| 1666 if (addr > node->key) { | |
| 1667 node = node->right; | |
| 1668 continue; | |
| 1669 } | |
| 1670 | |
| 1671 /* addr == node->key */ | |
| 1672 | |
| 1673 return (ngx_resolver_node_t *) node; | |
| 1674 } | |
| 1675 | |
| 1676 /* not found */ | |
| 1677 | |
| 1678 return NULL; | |
| 1679 } | |
| 1680 | |
| 1681 | |
| 1682 static void | |
| 1683 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
| 1684 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
| 1685 { | |
| 1686 ngx_rbtree_node_t **p; | |
| 1687 ngx_resolver_node_t *rn, *rn_temp; | |
| 1688 | |
| 1689 for ( ;; ) { | |
| 1690 | |
| 1691 if (node->key < temp->key) { | |
| 1692 | |
| 1693 p = &temp->left; | |
| 1694 | |
| 1695 } else if (node->key > temp->key) { | |
| 1696 | |
| 1697 p = &temp->right; | |
| 1698 | |
| 1699 } else { /* node->key == temp->key */ | |
| 1700 | |
| 1701 rn = (ngx_resolver_node_t *) node; | |
| 1702 rn_temp = (ngx_resolver_node_t *) temp; | |
| 1703 | |
|
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|
1704 p = (ngx_memn2cmp(rn->name, rn_temp->name, rn->nlen, rn_temp->nlen) |
|
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diff
changeset
|
1705 < 0) ? &temp->left : &temp->right; |
| 1649 | 1706 } |
| 1707 | |
| 1708 if (*p == sentinel) { | |
| 1709 break; | |
| 1710 } | |
| 1711 | |
| 1712 temp = *p; | |
| 1713 } | |
| 1714 | |
| 1715 *p = node; | |
| 1716 node->parent = temp; | |
| 1717 node->left = sentinel; | |
| 1718 node->right = sentinel; | |
| 1719 ngx_rbt_red(node); | |
| 1720 } | |
| 1721 | |
| 1722 | |
| 1723 static ngx_int_t | |
| 1724 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1725 { | |
| 1726 u_char *p, *s; | |
|
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|
1727 size_t len, nlen; |
| 1649 | 1728 ngx_uint_t ident; |
| 1729 ngx_resolver_qs_t *qs; | |
| 1730 ngx_resolver_query_t *query; | |
| 1731 | |
|
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diff
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|
1732 nlen = ctx->name.len ? (1 + ctx->name.len + 1) : 1; |
|
61bdaac6c668
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diff
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|
1733 |
|
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diff
changeset
|
1734 len = sizeof(ngx_resolver_query_t) + nlen + sizeof(ngx_resolver_qs_t); |
| 1649 | 1735 |
|
3307
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changeset
|
1736 p = ngx_resolver_alloc(ctx->resolver, len); |
| 1649 | 1737 if (p == NULL) { |
| 1738 return NGX_ERROR; | |
| 1739 } | |
| 1740 | |
| 1741 rn->qlen = (u_short) len; | |
| 1742 rn->query = p; | |
| 1743 | |
| 1744 query = (ngx_resolver_query_t *) p; | |
| 1745 | |
| 1746 ident = ngx_random(); | |
| 1747 | |
| 1748 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0, | |
| 1749 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff); | |
| 1750 | |
| 1751 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1752 query->ident_lo = (u_char) (ident & 0xff); | |
| 1753 | |
| 1754 /* recursion query */ | |
| 1755 query->flags_hi = 1; query->flags_lo = 0; | |
| 1756 | |
| 1757 /* one question */ | |
| 1758 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1759 query->nan_hi = 0; query->nan_lo = 0; | |
| 1760 query->nns_hi = 0; query->nns_lo = 0; | |
| 1761 query->nar_hi = 0; query->nar_lo = 0; | |
| 1762 | |
|
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|
1763 p += sizeof(ngx_resolver_query_t) + nlen; |
| 1649 | 1764 |
| 1765 qs = (ngx_resolver_qs_t *) p; | |
| 1766 | |
| 1767 /* query type */ | |
| 1768 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type; | |
| 1769 | |
| 1770 /* IP query class */ | |
| 1771 qs->class_hi = 0; qs->class_lo = 1; | |
| 1772 | |
| 1773 /* convert "www.example.com" to "\3www\7example\3com\0" */ | |
| 1774 | |
| 1775 len = 0; | |
| 1776 p--; | |
| 1777 *p-- = '\0'; | |
| 1778 | |
| 1779 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) { | |
| 1780 if (*s != '.') { | |
| 1781 *p = *s; | |
| 1782 len++; | |
| 1783 | |
| 1784 } else { | |
|
1961
99b9feacccb4
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1960
diff
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|
1785 if (len == 0) { |
|
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1960
diff
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|
1786 return NGX_DECLINED; |
|
99b9feacccb4
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1960
diff
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|
1787 } |
|
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1960
diff
changeset
|
1788 |
| 1649 | 1789 *p = (u_char) len; |
| 1790 len = 0; | |
| 1791 } | |
| 1792 | |
| 1793 p--; | |
| 1794 } | |
| 1795 | |
| 1796 *p = (u_char) len; | |
| 1797 | |
| 1798 return NGX_OK; | |
| 1799 } | |
| 1800 | |
| 1801 | |
| 1802 /* AF_INET only */ | |
| 1803 | |
| 1804 static ngx_int_t | |
| 1805 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1806 { | |
| 1807 u_char *p, *d; | |
| 1808 size_t len; | |
| 1809 ngx_int_t n; | |
| 1810 ngx_uint_t ident; | |
| 1811 ngx_resolver_query_t *query; | |
| 1812 | |
| 1813 len = sizeof(ngx_resolver_query_t) | |
| 1814 + sizeof(".255.255.255.255.in-addr.arpa.") - 1 | |
| 1815 + sizeof(ngx_resolver_qs_t); | |
| 1816 | |
|
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diff
changeset
|
1817 p = ngx_resolver_alloc(ctx->resolver, len); |
| 1649 | 1818 if (p == NULL) { |
| 1819 return NGX_ERROR; | |
| 1820 } | |
| 1821 | |
| 1822 rn->query = p; | |
| 1823 query = (ngx_resolver_query_t *) p; | |
| 1824 | |
| 1825 ident = ngx_random(); | |
| 1826 | |
| 1827 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1828 query->ident_lo = (u_char) (ident & 0xff); | |
| 1829 | |
| 1830 /* recursion query */ | |
| 1831 query->flags_hi = 1; query->flags_lo = 0; | |
| 1832 | |
| 1833 /* one question */ | |
| 1834 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1835 query->nan_hi = 0; query->nan_lo = 0; | |
| 1836 query->nns_hi = 0; query->nns_lo = 0; | |
| 1837 query->nar_hi = 0; query->nar_lo = 0; | |
| 1838 | |
| 1839 p += sizeof(ngx_resolver_query_t); | |
| 1840 | |
| 3642 | 1841 for (n = 0; n < 32; n += 8) { |
| 1649 | 1842 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff); |
| 1843 *p = (u_char) (d - &p[1]); | |
| 1844 p = d; | |
| 1845 } | |
| 1846 | |
| 1847 /* query type "PTR", IP query class */ | |
| 1848 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18); | |
| 1849 | |
| 1850 rn->qlen = (u_short) | |
| 1851 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t) | |
| 1852 - rn->query); | |
| 1853 | |
| 1854 return NGX_OK; | |
| 1855 } | |
| 1856 | |
| 1857 | |
| 1858 static ngx_int_t | |
| 1859 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src, | |
| 1860 u_char *last) | |
| 1861 { | |
| 1862 char *err; | |
| 1863 u_char *p, *dst; | |
| 1864 ssize_t len; | |
| 1865 ngx_uint_t i, n; | |
| 1866 | |
| 1867 p = src; | |
| 1868 len = -1; | |
| 1869 | |
| 1870 /* | |
| 1871 * compression pointers allow to create endless loop, so we set limit; | |
| 1872 * 128 pointers should be enough to store 255-byte name | |
| 1873 */ | |
| 1874 | |
| 1875 for (i = 0; i < 128; i++) { | |
| 1876 n = *p++; | |
| 1877 | |
| 1878 if (n == 0) { | |
| 1879 goto done; | |
| 1880 } | |
| 1881 | |
| 1882 if (n & 0xc0) { | |
|
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diff
changeset
|
1883 n = ((n & 0x3f) << 8) + *p; |
| 1649 | 1884 p = &buf[n]; |
| 1885 | |
| 1886 } else { | |
| 1887 len += 1 + n; | |
| 1888 p = &p[n]; | |
| 1889 } | |
| 1890 | |
| 1891 if (p >= last) { | |
| 1892 err = "name is out of response"; | |
| 1893 goto invalid; | |
| 1894 } | |
| 1895 } | |
| 1896 | |
| 1897 err = "compression pointers loop"; | |
| 1898 | |
| 1899 invalid: | |
| 1900 | |
| 1901 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1902 | |
| 1903 return NGX_ERROR; | |
| 1904 | |
| 1905 done: | |
| 1906 | |
| 1907 if (name == NULL) { | |
| 583 | 1908 return NGX_OK; |
| 1909 } | |
| 1910 | |
|
3298
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|
1911 if (len == -1) { |
|
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diff
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|
1912 name->len = 0; |
|
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|
1913 name->data = NULL; |
|
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1914 return NGX_OK; |
|
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|
1915 } |
|
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|
1916 |
| 1649 | 1917 dst = ngx_resolver_alloc(r, len); |
| 1918 if (dst == NULL) { | |
| 1919 return NGX_ERROR; | |
| 1920 } | |
| 1921 | |
| 1922 name->data = dst; | |
| 1923 | |
| 1924 n = *src++; | |
| 1925 | |
| 1926 for ( ;; ) { | |
| 4287 | 1927 if (n & 0xc0) { |
| 1928 n = ((n & 0x3f) << 8) + *src; | |
| 1929 src = &buf[n]; | |
| 1930 | |
| 1931 n = *src++; | |
| 1932 | |
| 1933 } else { | |
| 1649 | 1934 ngx_memcpy(dst, src, n); |
| 1935 dst += n; | |
| 1936 src += n; | |
| 1937 | |
| 1938 n = *src++; | |
| 1939 | |
| 1940 if (n != 0) { | |
| 1941 *dst++ = '.'; | |
| 1942 } | |
| 1943 } | |
| 1944 | |
| 1945 if (n == 0) { | |
| 1946 name->len = dst - name->data; | |
| 1947 return NGX_OK; | |
| 1948 } | |
| 1949 } | |
| 1950 } | |
| 1951 | |
| 1952 | |
| 1953 static void | |
| 1954 ngx_resolver_timeout_handler(ngx_event_t *ev) | |
| 1955 { | |
| 1956 ngx_resolver_ctx_t *ctx; | |
| 1957 | |
| 1958 ctx = ev->data; | |
| 1959 | |
| 1960 ctx->state = NGX_RESOLVE_TIMEDOUT; | |
| 1961 | |
| 1962 ctx->handler(ctx); | |
| 1963 } | |
| 1964 | |
| 1965 | |
| 1966 static void | |
| 1967 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 1968 { | |
| 1969 /* lock alloc mutex */ | |
| 1970 | |
| 1971 if (rn->query) { | |
| 1972 ngx_resolver_free_locked(r, rn->query); | |
| 1973 } | |
| 1974 | |
| 1975 if (rn->name) { | |
| 1976 ngx_resolver_free_locked(r, rn->name); | |
| 1977 } | |
| 1978 | |
| 1979 if (rn->cnlen) { | |
| 1980 ngx_resolver_free_locked(r, rn->u.cname); | |
| 1981 } | |
| 1982 | |
| 1983 if (rn->naddrs > 1) { | |
| 1984 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 1985 } | |
| 1986 | |
| 1987 ngx_resolver_free_locked(r, rn); | |
| 1988 | |
| 1989 /* unlock alloc mutex */ | |
| 1990 } | |
| 1991 | |
| 1992 | |
| 1993 static void * | |
| 1994 ngx_resolver_alloc(ngx_resolver_t *r, size_t size) | |
| 1995 { | |
| 1996 u_char *p; | |
| 1997 | |
| 1998 /* lock alloc mutex */ | |
| 1999 | |
| 2000 p = ngx_alloc(size, r->log); | |
| 2001 | |
| 2002 /* unlock alloc mutex */ | |
| 2003 | |
| 2004 return p; | |
| 2005 } | |
| 2006 | |
| 2007 | |
| 1903 | 2008 static void * |
| 1649 | 2009 ngx_resolver_calloc(ngx_resolver_t *r, size_t size) |
| 2010 { | |
| 2011 u_char *p; | |
| 2012 | |
| 2013 p = ngx_resolver_alloc(r, size); | |
| 2014 | |
| 2015 if (p) { | |
| 2016 ngx_memzero(p, size); | |
| 2017 } | |
| 2018 | |
| 2019 return p; | |
| 2020 } | |
| 2021 | |
| 2022 | |
| 2023 static void | |
| 2024 ngx_resolver_free(ngx_resolver_t *r, void *p) | |
| 2025 { | |
| 2026 /* lock alloc mutex */ | |
| 2027 | |
| 2028 ngx_free(p); | |
| 2029 | |
| 2030 /* unlock alloc mutex */ | |
| 2031 } | |
| 2032 | |
| 2033 | |
| 2034 static void | |
| 2035 ngx_resolver_free_locked(ngx_resolver_t *r, void *p) | |
| 2036 { | |
| 2037 ngx_free(p); | |
| 2038 } | |
| 2039 | |
| 2040 | |
| 2041 static void * | |
| 2042 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size) | |
| 2043 { | |
| 2044 void *dst; | |
| 2045 | |
| 2046 dst = ngx_resolver_alloc(r, size); | |
| 2047 | |
| 2048 if (dst == NULL) { | |
| 2049 return dst; | |
| 2050 } | |
| 2051 | |
| 2052 ngx_memcpy(dst, src, size); | |
| 2053 | |
| 2054 return dst; | |
| 2055 } | |
| 2056 | |
| 2057 | |
| 2058 char * | |
| 2059 ngx_resolver_strerror(ngx_int_t err) | |
| 2060 { | |
| 2061 static char *errors[] = { | |
| 2062 "Format error", /* FORMERR */ | |
| 2063 "Server failure", /* SERVFAIL */ | |
| 2064 "Host not found", /* NXDOMAIN */ | |
| 2065 "Unimplemented", /* NOTIMP */ | |
| 2066 "Operation refused" /* REFUSED */ | |
| 2067 }; | |
| 2068 | |
| 2069 if (err > 0 && err < 6) { | |
| 2070 return errors[err - 1]; | |
| 2071 } | |
| 2072 | |
| 2073 if (err == NGX_RESOLVE_TIMEDOUT) { | |
| 2074 return "Operation timed out"; | |
| 2075 } | |
| 2076 | |
| 2077 return "Unknown error"; | |
| 2078 } | |
| 2079 | |
| 2080 | |
|
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diff
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|
2081 static u_char * |
|
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|
2082 ngx_resolver_log_error(ngx_log_t *log, u_char *buf, size_t len) |
|
71193a456616
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diff
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|
2083 { |
|
71193a456616
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diff
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|
2084 u_char *p; |
|
71193a456616
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diff
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|
2085 ngx_udp_connection_t *uc; |
|
71193a456616
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diff
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|
2086 |
|
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|
2087 p = buf; |
|
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|
2088 |
|
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diff
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|
2089 if (log->action) { |
|
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|
2090 p = ngx_snprintf(buf, len, " while %s", log->action); |
|
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|
2091 len -= p - buf; |
|
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|
2092 } |
|
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|
2093 |
|
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|
2094 uc = log->data; |
|
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|
2095 |
|
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|
2096 if (uc) { |
|
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changeset
|
2097 p = ngx_snprintf(p, len, ", resolver: %V", &uc->server); |
|
71193a456616
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|
2098 } |
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2099 |
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2100 return p; |
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2101 } |
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2102 |
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2103 |
| 1649 | 2104 ngx_int_t |
| 2105 ngx_udp_connect(ngx_udp_connection_t *uc) | |
| 2106 { | |
| 2107 int rc; | |
| 2108 ngx_int_t event; | |
| 2109 ngx_event_t *rev, *wev; | |
| 2110 ngx_socket_t s; | |
| 2111 ngx_connection_t *c; | |
| 2112 | |
| 583 | 2113 s = ngx_socket(AF_INET, SOCK_DGRAM, 0); |
| 2114 | |
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2115 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, &uc->log, 0, "UDP socket %d", s); |
| 583 | 2116 |
| 2117 if (s == -1) { | |
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2118 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
| 583 | 2119 ngx_socket_n " failed"); |
| 2120 return NGX_ERROR; | |
| 2121 } | |
| 2122 | |
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2123 c = ngx_get_connection(s, &uc->log); |
| 583 | 2124 |
| 2125 if (c == NULL) { | |
| 2126 if (ngx_close_socket(s) == -1) { | |
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2127 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
| 583 | 2128 ngx_close_socket_n "failed"); |
| 2129 } | |
| 2130 | |
| 2131 return NGX_ERROR; | |
| 2132 } | |
| 2133 | |
| 1649 | 2134 if (ngx_nonblocking(s) == -1) { |
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2135 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
| 1649 | 2136 ngx_nonblocking_n " failed"); |
| 2137 | |
| 2138 ngx_free_connection(c); | |
| 2139 | |
| 2140 if (ngx_close_socket(s) == -1) { | |
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2141 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
| 1649 | 2142 ngx_close_socket_n " failed"); |
| 2143 } | |
| 2144 | |
| 2145 return NGX_ERROR; | |
| 2146 } | |
| 2147 | |
| 583 | 2148 rev = c->read; |
| 2149 wev = c->write; | |
| 2150 | |
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2151 rev->log = &uc->log; |
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2152 wev->log = &uc->log; |
| 1649 | 2153 |
| 2154 uc->connection = c; | |
| 583 | 2155 |
| 2156 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); | |
| 2157 | |
| 2158 #if (NGX_THREADS) | |
| 1649 | 2159 |
| 2160 /* TODO: lock event when call completion handler */ | |
| 2161 | |
| 2162 rev->lock = &c->lock; | |
| 2163 wev->lock = &c->lock; | |
| 583 | 2164 rev->own_lock = &c->lock; |
| 2165 wev->own_lock = &c->lock; | |
| 1649 | 2166 |
| 583 | 2167 #endif |
| 2168 | |
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2169 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, &uc->log, 0, |
| 1649 | 2170 "connect to %V, fd:%d #%d", &uc->server, s, c->number); |
| 2171 | |
| 2172 rc = connect(s, uc->sockaddr, uc->socklen); | |
| 2173 | |
| 2174 /* TODO: aio, iocp */ | |
| 583 | 2175 |
| 2176 if (rc == -1) { | |
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2177 ngx_log_error(NGX_LOG_CRIT, &uc->log, ngx_socket_errno, |
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2178 "connect() failed"); |
| 583 | 2179 |
| 2180 return NGX_ERROR; | |
| 2181 } | |
| 2182 | |
| 1649 | 2183 /* UDP sockets are always ready to write */ |
| 2184 wev->ready = 1; | |
| 2185 | |
| 2186 if (ngx_add_event) { | |
| 2187 | |
| 2188 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ? | |
| 2189 /* kqueue, epoll */ NGX_CLEAR_EVENT: | |
| 2190 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT; | |
| 2191 /* eventport event type has no meaning: oneshot only */ | |
| 2192 | |
| 2193 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { | |
| 2194 return NGX_ERROR; | |
| 2195 } | |
| 2196 | |
| 2197 } else { | |
| 2198 /* rtsig */ | |
| 2199 | |
| 583 | 2200 if (ngx_add_conn(c) == NGX_ERROR) { |
| 2201 return NGX_ERROR; | |
| 2202 } | |
| 2203 } | |
| 2204 | |
| 2205 return NGX_OK; | |
| 2206 } |