Mercurial > hg > nginx
annotate src/core/ngx_resolver.c @ 1683:1e0b028055ec
allow to use IP addresses without defined resolver
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Mon, 03 Dec 2007 10:05:19 +0000 |
| parents | ca317d9b5c09 |
| children | a24c909ad879 |
| rev | line source |
|---|---|
| 583 | 1 |
| 2 /* | |
| 3 * Copyright (C) Igor Sysoev | |
| 4 */ | |
| 5 | |
| 6 | |
| 7 #include <ngx_config.h> | |
| 8 #include <ngx_core.h> | |
| 9 #include <ngx_event.h> | |
| 10 | |
| 11 | |
| 1649 | 12 #define NGX_RESOLVER_UDP_SIZE 4096 |
| 13 | |
| 14 | |
| 583 | 15 typedef struct { |
| 1649 | 16 u_char ident_hi; |
| 17 u_char ident_lo; | |
| 18 u_char flags_hi; | |
| 19 u_char flags_lo; | |
| 20 u_char nqs_hi; | |
| 21 u_char nqs_lo; | |
| 22 u_char nan_hi; | |
| 23 u_char nan_lo; | |
| 24 u_char nns_hi; | |
| 25 u_char nns_lo; | |
| 26 u_char nar_hi; | |
| 27 u_char nar_lo; | |
| 28 } ngx_resolver_query_t; | |
| 29 | |
| 30 | |
| 31 typedef struct { | |
| 32 u_char type_hi; | |
| 33 u_char type_lo; | |
| 34 u_char class_hi; | |
| 35 u_char class_lo; | |
| 36 } ngx_resolver_qs_t; | |
| 37 | |
| 38 | |
| 39 typedef struct { | |
| 40 u_char type_hi; | |
| 41 u_char type_lo; | |
| 42 u_char class_hi; | |
| 43 u_char class_lo; | |
| 44 u_char ttl[4]; | |
| 45 u_char len_hi; | |
| 46 u_char len_lo; | |
| 47 } ngx_resolver_an_t; | |
| 48 | |
| 49 | |
| 50 ngx_int_t ngx_udp_connect(ngx_udp_connection_t *uc); | |
| 51 | |
| 52 | |
| 53 static ngx_int_t ngx_resolve_name_locked(ngx_resolver_t *r, | |
| 54 ngx_resolver_ctx_t *ctx); | |
| 55 static void ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
| 56 ngx_queue_t *queue); | |
| 57 static ngx_int_t ngx_resolver_send_query(ngx_resolver_t *r, | |
| 58 ngx_resolver_node_t *rn); | |
| 59 static ngx_int_t ngx_resolver_create_name_query(ngx_resolver_node_t *rn, | |
| 60 ngx_resolver_ctx_t *ctx); | |
| 61 static ngx_int_t ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, | |
| 62 ngx_resolver_ctx_t *ctx); | |
| 63 static void ngx_resolver_resend_handler(ngx_event_t *ev); | |
| 64 static time_t ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
| 65 ngx_queue_t *queue); | |
| 66 static void ngx_resolver_read_response(ngx_event_t *rev); | |
| 67 static void ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, | |
| 68 size_t n); | |
| 69 static void ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t n, | |
| 70 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t i); | |
| 71 static void ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, | |
| 72 ngx_uint_t ident, ngx_uint_t code); | |
| 73 static ngx_resolver_node_t *ngx_resolver_lookup_name(ngx_resolver_t *r, | |
| 74 ngx_str_t *name, uint32_t hash); | |
| 75 static ngx_resolver_node_t *ngx_resolver_lookup_addr(ngx_resolver_t *r, | |
| 76 in_addr_t addr); | |
| 77 static void ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
| 78 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel); | |
| 79 static ngx_int_t ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, | |
| 80 u_char *buf, u_char *src, u_char *last); | |
| 81 static void ngx_resolver_timeout_handler(ngx_event_t *ev); | |
| 82 static void ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn); | |
| 83 static void *ngx_resolver_alloc(ngx_resolver_t *r, size_t size); | |
| 84 static void ngx_resolver_free(ngx_resolver_t *r, void *p); | |
| 85 static void ngx_resolver_free_locked(ngx_resolver_t *r, void *p); | |
| 86 static void *ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size); | |
| 87 | |
| 88 | |
| 89 /* STUB: ngx_peer_addr_t * */ | |
| 90 | |
| 91 ngx_resolver_t * | |
| 92 ngx_resolver_create(ngx_peer_addr_t *addr, ngx_log_t *log) | |
| 93 { | |
| 94 ngx_resolver_t *r; | |
| 95 ngx_udp_connection_t *uc; | |
| 96 | |
| 97 r = ngx_calloc(sizeof(ngx_resolver_t), log); | |
| 98 if (r == NULL) { | |
| 99 return NULL; | |
| 100 } | |
| 101 | |
| 102 r->event = ngx_calloc(sizeof(ngx_event_t), log); | |
| 103 if (r->event == NULL) { | |
| 104 return NULL; | |
| 105 } | |
| 106 | |
| 107 ngx_rbtree_sentinel_init(&r->name_sentinel); | |
| 108 | |
| 109 r->name_rbtree.root = &r->name_sentinel; | |
| 110 r->name_rbtree.sentinel = &r->name_sentinel; | |
| 111 r->name_rbtree.insert = ngx_resolver_rbtree_insert_value; | |
| 112 | |
| 113 ngx_rbtree_sentinel_init(&r->addr_sentinel); | |
| 114 | |
| 115 r->addr_rbtree.root = &r->addr_sentinel; | |
| 116 r->addr_rbtree.sentinel = &r->addr_sentinel; | |
| 117 r->addr_rbtree.insert = ngx_rbtree_insert_value; | |
| 118 | |
| 119 r->name_resend_queue.prev = &r->name_resend_queue; | |
| 120 r->name_resend_queue.next = &r->name_resend_queue; | |
| 121 | |
| 122 r->addr_resend_queue.prev = &r->addr_resend_queue; | |
| 123 r->addr_resend_queue.next = &r->addr_resend_queue; | |
| 124 | |
| 125 r->name_expire_queue.prev = &r->name_expire_queue; | |
| 126 r->name_expire_queue.next = &r->name_expire_queue; | |
| 127 | |
| 128 r->addr_expire_queue.prev = &r->addr_expire_queue; | |
| 129 r->addr_expire_queue.next = &r->addr_expire_queue; | |
| 130 | |
| 131 r->event->handler = ngx_resolver_resend_handler; | |
| 132 r->event->data = r; | |
| 133 r->event->log = log; | |
| 134 r->ident = -1; | |
| 135 | |
| 136 r->resend_timeout = 5; | |
| 137 r->expire = 30; | |
| 138 r->valid = 300; | |
| 139 | |
| 140 r->log = log; | |
| 141 r->log_level = NGX_LOG_ALERT; | |
| 142 | |
|
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allow to use IP addresses without defined resolver
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parents:
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changeset
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143 if (addr) { |
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parents:
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144 uc = ngx_calloc(sizeof(ngx_udp_connection_t), log); |
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parents:
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145 if (uc == NULL) { |
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parents:
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changeset
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146 return NULL; |
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1e0b028055ec
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Igor Sysoev <igor@sysoev.ru>
parents:
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changeset
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147 } |
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Igor Sysoev <igor@sysoev.ru>
parents:
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148 |
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parents:
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149 r->udp_connection = uc; |
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1e0b028055ec
allow to use IP addresses without defined resolver
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parents:
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150 |
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parents:
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151 uc->sockaddr = addr->sockaddr; |
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parents:
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diff
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152 uc->socklen = addr->socklen; |
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parents:
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153 uc->server = addr->name; |
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parents:
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diff
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154 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
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155 } |
| 1649 | 156 |
| 157 return r; | |
| 158 } | |
| 159 | |
| 160 | |
| 161 ngx_resolver_ctx_t * | |
| 162 ngx_resolve_start(ngx_resolver_t *r, ngx_resolver_ctx_t *temp) | |
| 163 { | |
| 164 in_addr_t addr; | |
| 165 ngx_resolver_ctx_t *ctx; | |
| 166 | |
| 167 if (temp) { | |
| 168 addr = ngx_inet_addr(temp->name.data, temp->name.len); | |
| 169 | |
| 170 if (addr != INADDR_NONE) { | |
| 171 temp->resolver = r; | |
| 172 temp->state = NGX_OK; | |
| 173 temp->naddrs = 1; | |
| 174 temp->addrs = &temp->addr; | |
| 175 temp->addr = addr; | |
| 176 temp->quick = 1; | |
| 177 | |
| 178 return temp; | |
| 179 } | |
| 180 } | |
| 181 | |
|
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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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182 if (r->udp_connection == NULL) { |
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1e0b028055ec
allow to use IP addresses without defined resolver
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parents:
1679
diff
changeset
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183 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
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184 } |
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1e0b028055ec
allow to use IP addresses without defined resolver
Igor Sysoev <igor@sysoev.ru>
parents:
1679
diff
changeset
|
185 |
| 1649 | 186 ctx = ngx_resolver_calloc(r, sizeof(ngx_resolver_ctx_t)); |
| 187 | |
| 188 if (ctx) { | |
| 189 ctx->resolver = r; | |
| 190 } | |
| 191 | |
| 192 return ctx; | |
| 193 } | |
| 194 | |
| 195 | |
| 196 ngx_int_t | |
| 197 ngx_resolve_name(ngx_resolver_ctx_t *ctx) | |
| 198 { | |
| 199 ngx_int_t rc; | |
| 200 ngx_resolver_t *r; | |
| 201 | |
| 202 r = ctx->resolver; | |
| 203 | |
| 204 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 205 "resolve: \"%V\"", &ctx->name); | |
| 206 | |
| 207 if (ctx->quick) { | |
| 208 ctx->handler(ctx); | |
| 209 return NGX_OK; | |
| 210 } | |
| 211 | |
| 212 /* lock name mutex */ | |
| 213 | |
| 214 rc = ngx_resolve_name_locked(r, ctx); | |
| 215 | |
| 216 if (rc == NGX_OK) { | |
| 217 return NGX_OK; | |
| 218 } | |
| 219 | |
| 220 /* unlock name mutex */ | |
| 221 | |
| 222 if (rc == NGX_AGAIN) { | |
| 223 return NGX_OK; | |
| 224 } | |
| 225 | |
| 226 /* lock alloc mutex */ | |
| 227 | |
| 228 if (ctx->event) { | |
| 229 ngx_resolver_free_locked(r, ctx->event); | |
| 230 } | |
| 231 | |
| 232 ngx_resolver_free_locked(r, ctx); | |
| 233 | |
| 234 /* unlock alloc mutex */ | |
| 235 | |
| 236 return NGX_ERROR; | |
| 237 } | |
| 238 | |
| 239 | |
| 240 void | |
| 241 ngx_resolve_name_done(ngx_resolver_ctx_t *ctx) | |
| 242 { | |
| 243 uint32_t hash; | |
| 244 ngx_resolver_t *r; | |
| 245 ngx_resolver_ctx_t *w, **p; | |
| 246 ngx_resolver_node_t *rn; | |
| 247 | |
| 248 r = ctx->resolver; | |
| 249 | |
| 250 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 251 "resolve name done: %i", ctx->state); | |
| 252 | |
| 253 if (ctx->quick) { | |
| 254 return; | |
| 255 } | |
| 256 | |
| 257 if (ctx->event && ctx->event->timer_set) { | |
| 258 ngx_del_timer(ctx->event); | |
| 259 } | |
| 260 | |
| 261 /* lock name mutex */ | |
| 262 | |
| 263 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
| 264 | |
| 265 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
| 266 | |
| 267 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
| 268 | |
| 269 if (rn) { | |
| 270 p = &rn->waiting; | |
| 271 w = rn->waiting; | |
| 272 | |
| 273 while (w) { | |
| 274 if (w == ctx) { | |
| 275 *p = w->next; | |
| 276 | |
| 277 goto done; | |
| 278 } | |
| 279 | |
| 280 p = &w->next; | |
| 281 w = w->next; | |
| 282 } | |
| 283 } | |
| 284 | |
| 285 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
| 286 "could not cancel %V resolving", &ctx->name); | |
| 287 } | |
| 288 | |
| 289 done: | |
| 290 | |
| 291 ngx_resolver_expire(r, &r->name_rbtree, &r->name_expire_queue); | |
| 292 | |
| 293 /* unlock name mutex */ | |
| 294 | |
| 295 ngx_resolver_free(r, ctx); | |
| 296 } | |
| 297 | |
| 298 | |
| 299 /* NGX_RESOLVE_A only */ | |
| 300 | |
| 301 static ngx_int_t | |
| 302 ngx_resolve_name_locked(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx) | |
| 303 { | |
| 304 uint32_t hash; | |
| 305 in_addr_t addr, *addrs; | |
| 306 ngx_uint_t naddrs; | |
| 307 ngx_resolver_ctx_t *next; | |
| 308 ngx_resolver_node_t *rn; | |
| 309 | |
| 310 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
| 311 | |
| 312 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
| 313 | |
| 314 if (rn) { | |
| 315 | |
| 316 if (rn->valid >= ngx_time()) { | |
| 317 | |
| 318 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
| 319 | |
| 320 ngx_queue_remove(&rn->queue); | |
| 321 | |
| 322 rn->expire = ngx_time() + r->expire; | |
| 323 | |
| 324 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 325 | |
| 326 naddrs = rn->naddrs; | |
| 327 | |
| 328 if (naddrs) { | |
| 329 | |
| 330 /* NGX_RESOLVE_A answer */ | |
| 331 | |
| 332 if (naddrs != 1) { | |
| 333 addr = 0; | |
| 334 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
| 335 naddrs * sizeof(in_addr_t)); | |
| 336 if (addrs == NULL) { | |
| 337 return NGX_ERROR; | |
| 338 } | |
| 339 | |
| 340 } else { | |
| 341 addr = rn->u.addr; | |
| 342 addrs = NULL; | |
| 343 } | |
| 344 | |
| 345 ctx->next = rn->waiting; | |
| 346 rn->waiting = NULL; | |
| 347 | |
| 348 /* unlock name mutex */ | |
| 349 | |
| 350 do { | |
| 351 ctx->state = NGX_OK; | |
| 352 ctx->naddrs = naddrs; | |
| 353 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 354 ctx->addr = addr; | |
| 355 next = ctx->next; | |
| 356 | |
| 357 ctx->handler(ctx); | |
| 358 | |
| 359 ctx = next; | |
| 360 } while (ctx); | |
| 361 | |
| 362 if (addrs) { | |
| 363 ngx_resolver_free(r, addrs); | |
| 364 } | |
| 365 | |
| 366 return NGX_OK; | |
| 367 } | |
| 368 | |
| 369 /* NGX_RESOLVE_CNAME */ | |
| 370 | |
| 371 ctx->name.len = rn->cnlen; | |
| 372 ctx->name.data = rn->u.cname; | |
| 373 | |
| 374 return ngx_resolve_name_locked(r, ctx); | |
| 375 } | |
| 376 | |
| 377 if (rn->waiting) { | |
| 378 | |
| 379 ctx->next = rn->waiting; | |
| 380 rn->waiting = ctx; | |
| 381 | |
| 382 return NGX_AGAIN; | |
| 383 } | |
| 384 | |
| 385 ngx_queue_remove(&rn->queue); | |
| 386 | |
| 387 /* lock alloc mutex */ | |
| 388 | |
| 389 ngx_resolver_free_locked(r, rn->query); | |
| 390 | |
| 391 if (rn->cnlen) { | |
| 392 ngx_resolver_free_locked(r, rn->u.cname); | |
| 393 } | |
| 394 | |
| 395 if (rn->naddrs > 1) { | |
| 396 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 397 } | |
| 398 | |
| 399 /* unlock alloc mutex */ | |
| 400 | |
| 401 } else { | |
| 402 | |
| 403 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
| 404 if (rn == NULL) { | |
| 405 return NGX_ERROR; | |
| 406 } | |
| 407 | |
| 408 rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len); | |
| 409 if (rn->name == NULL) { | |
| 410 ngx_resolver_free(r, rn); | |
| 411 return NGX_ERROR; | |
| 412 } | |
| 413 | |
| 414 rn->node.key = hash; | |
| 415 rn->nlen = (u_short) ctx->name.len; | |
| 416 | |
| 417 ngx_rbtree_insert(&r->name_rbtree, &rn->node); | |
| 418 } | |
| 419 | |
| 420 if (ngx_resolver_create_name_query(rn, ctx) != NGX_OK) { | |
| 421 goto failed; | |
| 422 } | |
| 423 | |
| 424 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
| 425 goto failed; | |
| 426 } | |
| 427 | |
| 428 if (ctx->event == NULL) { | |
| 429 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
| 430 if (ctx->event == NULL) { | |
| 431 goto failed; | |
| 432 } | |
| 433 | |
| 434 ctx->event->handler = ngx_resolver_timeout_handler; | |
| 435 ctx->event->data = ctx; | |
| 436 ctx->event->log = r->log; | |
| 437 ctx->ident = -1; | |
| 438 | |
| 439 ngx_add_timer(ctx->event, ctx->timeout); | |
| 440 } | |
| 441 | |
| 442 if (ngx_queue_empty(&r->name_resend_queue)) { | |
| 443 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
| 444 } | |
| 445 | |
| 446 rn->expire = ngx_time() + r->resend_timeout; | |
| 447 | |
| 448 ngx_queue_insert_head(&r->name_resend_queue, &rn->queue); | |
| 449 | |
| 450 rn->cnlen = 0; | |
| 451 rn->naddrs = 0; | |
| 452 rn->valid = 0; | |
| 453 rn->waiting = ctx; | |
| 454 | |
| 455 ctx->state = NGX_AGAIN; | |
| 456 | |
| 457 return NGX_AGAIN; | |
| 458 | |
| 459 failed: | |
| 460 | |
| 461 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 462 | |
| 463 ngx_resolver_free(r, rn->name); | |
| 464 | |
| 465 ngx_resolver_free(r, rn); | |
| 466 | |
| 467 return NGX_ERROR; | |
| 468 } | |
| 583 | 469 |
| 470 | |
| 471 ngx_int_t | |
| 1649 | 472 ngx_resolve_addr(ngx_resolver_ctx_t *ctx) |
| 473 { | |
| 474 ngx_resolver_t *r; | |
| 475 ngx_resolver_node_t *rn; | |
| 476 | |
| 477 r = ctx->resolver; | |
| 478 | |
| 479 ctx->addr = ntohl(ctx->addr); | |
| 480 | |
| 481 /* lock addr mutex */ | |
| 482 | |
| 483 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
| 484 | |
| 485 if (rn) { | |
| 486 | |
| 487 if (rn->valid >= ngx_time()) { | |
| 488 | |
| 489 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
| 490 | |
| 491 ngx_queue_remove(&rn->queue); | |
| 492 | |
| 493 rn->expire = ngx_time() + r->expire; | |
| 494 | |
| 495 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
| 496 | |
| 497 ctx->name.len = rn->nlen; | |
| 498 ctx->name.data = ngx_resolver_dup(r, rn->name, rn->nlen); | |
| 499 if (ctx->name.data == NULL) { | |
| 500 goto failed; | |
| 501 } | |
| 502 | |
| 503 /* unlock addr mutex */ | |
| 504 | |
| 505 ctx->state = NGX_OK; | |
| 506 | |
| 507 ctx->handler(ctx); | |
| 508 | |
| 509 ngx_resolver_free(r, ctx->name.data); | |
| 510 | |
| 511 return NGX_OK; | |
| 512 } | |
| 513 | |
| 514 if (rn->waiting) { | |
| 515 | |
| 516 ctx->next = rn->waiting; | |
| 517 rn->waiting = ctx; | |
| 518 | |
| 519 return NGX_AGAIN; | |
| 520 } | |
| 521 | |
| 522 ngx_queue_remove(&rn->queue); | |
| 523 | |
| 524 ngx_resolver_free(r, rn->query); | |
| 525 | |
| 526 } else { | |
| 527 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
| 528 if (rn == NULL) { | |
| 529 goto failed; | |
| 530 } | |
| 531 | |
| 532 rn->node.key = ctx->addr; | |
| 533 | |
| 534 ngx_rbtree_insert(&r->addr_rbtree, &rn->node); | |
| 535 } | |
| 536 | |
| 537 if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) { | |
| 538 goto failed; | |
| 539 } | |
| 540 | |
| 541 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
| 542 goto failed; | |
| 543 } | |
| 544 | |
| 545 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
| 546 if (ctx->event == NULL) { | |
| 547 goto failed; | |
| 548 } | |
| 549 | |
| 550 ctx->event->handler = ngx_resolver_timeout_handler; | |
| 551 ctx->event->data = ctx; | |
| 552 ctx->event->log = r->log; | |
| 553 ctx->ident = -1; | |
| 554 | |
| 555 ngx_add_timer(ctx->event, ctx->timeout); | |
| 556 | |
| 557 if (ngx_queue_empty(&r->addr_resend_queue)) { | |
| 558 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
| 559 } | |
| 560 | |
| 561 rn->expire = ngx_time() + r->resend_timeout; | |
| 562 | |
| 563 ngx_queue_insert_head(&r->addr_resend_queue, &rn->queue); | |
| 564 | |
| 565 rn->cnlen = 0; | |
| 566 rn->naddrs = 0; | |
| 567 rn->name = NULL; | |
| 568 rn->nlen = 0; | |
| 569 rn->valid = 0; | |
| 570 rn->waiting = ctx; | |
| 571 | |
| 572 /* unlock addr mutex */ | |
| 573 | |
| 574 ctx->state = NGX_AGAIN; | |
| 575 | |
| 576 return NGX_OK; | |
| 577 | |
| 578 failed: | |
| 579 | |
| 580 if (rn) { | |
| 581 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 582 | |
| 583 ngx_resolver_free(r, rn); | |
| 584 } | |
| 585 | |
| 586 /* unlock addr mutex */ | |
| 587 | |
| 588 /* lock alloc mutex */ | |
| 589 | |
| 590 if (ctx->event) { | |
| 591 ngx_resolver_free_locked(r, ctx->event); | |
| 592 } | |
| 593 | |
| 594 ngx_resolver_free_locked(r, ctx); | |
| 595 | |
| 596 /* unlock alloc mutex */ | |
| 597 | |
| 598 return NGX_ERROR; | |
| 599 } | |
| 600 | |
| 601 | |
| 602 void | |
| 603 ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx) | |
| 604 { | |
| 605 in_addr_t addr; | |
| 606 ngx_resolver_t *r; | |
| 607 ngx_resolver_ctx_t *w, **p; | |
| 608 ngx_resolver_node_t *rn; | |
| 609 | |
| 610 r = ctx->resolver; | |
| 611 | |
| 612 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 613 "resolve addr done: %i", ctx->state); | |
| 614 | |
| 615 if (ctx->event && ctx->event->timer_set) { | |
| 616 ngx_del_timer(ctx->event); | |
| 617 } | |
| 618 | |
| 619 /* lock addr mutex */ | |
| 620 | |
| 621 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
| 622 | |
| 623 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
| 624 | |
| 625 if (rn) { | |
| 626 p = &rn->waiting; | |
| 627 w = rn->waiting; | |
| 628 | |
| 629 while (w) { | |
| 630 if (w == ctx) { | |
| 631 *p = w->next; | |
| 632 | |
| 633 goto done; | |
| 634 } | |
| 635 | |
| 636 p = &w->next; | |
| 637 w = w->next; | |
| 638 } | |
| 639 } | |
| 640 | |
| 641 addr = ntohl(ctx->addr); | |
| 642 | |
| 643 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
| 644 "could not cancel %ud.%ud.%ud.%ud resolving", | |
| 645 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 646 (addr >> 8) & 0xff, addr & 0xff); | |
| 647 } | |
| 648 | |
| 649 done: | |
| 650 | |
| 651 ngx_resolver_expire(r, &r->addr_rbtree, &r->addr_expire_queue); | |
| 652 | |
| 653 /* unlock addr mutex */ | |
| 654 | |
| 655 ngx_resolver_free(r, ctx); | |
| 656 } | |
| 657 | |
| 658 | |
| 659 static void | |
| 660 ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 661 { | |
| 662 time_t now; | |
| 663 ngx_uint_t i; | |
| 664 ngx_queue_t *q; | |
| 665 ngx_resolver_node_t *rn; | |
| 666 | |
| 667 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire"); | |
| 668 | |
| 669 now = ngx_time(); | |
| 670 | |
| 671 for (i = 0; i < 2; i++) { | |
| 672 if (ngx_queue_empty(queue)) { | |
| 673 return; | |
| 674 } | |
| 675 | |
| 676 q = ngx_queue_last(queue); | |
| 677 | |
| 678 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 679 | |
| 680 if (now <= rn->expire) { | |
| 681 return; | |
| 682 } | |
| 683 | |
| 684 #if (NGX_DEBUG) | |
| 685 { | |
| 686 ngx_str_t s; | |
| 687 | |
| 688 s.len = rn->nlen; | |
| 689 s.data = rn->name; | |
| 690 | |
| 691 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 692 "resolver expire \"%V\"", &s); | |
| 693 } | |
| 694 #endif | |
| 695 | |
| 696 ngx_queue_remove(q); | |
| 697 | |
| 698 ngx_rbtree_delete(tree, &rn->node); | |
| 699 | |
| 700 ngx_resolver_free_node(r, rn); | |
| 701 } | |
| 702 } | |
| 703 | |
| 704 | |
| 705 static ngx_int_t | |
| 706 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 707 { | |
| 708 ssize_t n; | |
| 709 ngx_udp_connection_t *uc; | |
| 710 | |
| 711 uc = r->udp_connection; | |
| 712 | |
| 713 if (uc->connection == NULL) { | |
| 714 if (ngx_udp_connect(uc) != NGX_OK) { | |
| 715 return NGX_ERROR; | |
| 716 } | |
| 717 | |
| 718 uc->connection->data = r; | |
| 719 uc->connection->read->handler = ngx_resolver_read_response; | |
| 720 } | |
| 721 | |
| 722 n = ngx_send(uc->connection, rn->query, rn->qlen); | |
| 723 | |
| 724 if (n == -1) { | |
| 725 return NGX_ERROR; | |
| 726 } | |
| 727 | |
| 728 if ((size_t) n != (size_t) rn->qlen) { | |
| 729 ngx_log_error(NGX_LOG_CRIT, uc->log, 0, "send() incomplete"); | |
| 730 return NGX_ERROR; | |
| 731 } | |
| 732 | |
| 733 return NGX_OK; | |
| 734 } | |
| 735 | |
| 736 | |
| 737 static void | |
| 738 ngx_resolver_resend_handler(ngx_event_t *ev) | |
| 739 { | |
| 740 time_t timer, atimer, ntimer; | |
| 741 ngx_resolver_t *r; | |
| 742 | |
| 743 r = ev->data; | |
| 744 | |
| 745 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 746 "resolver resend handler"); | |
| 747 | |
| 748 /* lock name mutex */ | |
| 749 | |
| 750 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue); | |
| 751 | |
| 752 /* unlock name mutex */ | |
| 753 | |
| 754 /* lock addr mutex */ | |
| 755 | |
| 756 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
|
757 |
| 1649 | 758 /* unlock addr mutex */ |
| 759 | |
| 760 if (ntimer == 0) { | |
| 761 timer = atimer; | |
| 762 | |
| 763 } else if (atimer == 0) { | |
| 764 timer = ntimer; | |
| 765 | |
| 766 } else { | |
| 767 timer = (atimer < ntimer) ? atimer : ntimer; | |
| 768 } | |
| 769 | |
| 770 if (timer) { | |
| 771 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000)); | |
| 772 } | |
| 773 } | |
| 774 | |
| 775 | |
| 776 static time_t | |
| 777 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 778 { | |
| 779 time_t now; | |
| 780 ngx_queue_t *q; | |
| 781 ngx_resolver_node_t *rn; | |
| 782 | |
| 783 now = ngx_time(); | |
| 784 | |
| 785 for ( ;; ) { | |
| 786 if (ngx_queue_empty(queue)) { | |
| 787 return 0; | |
| 788 } | |
| 789 | |
| 790 q = ngx_queue_last(queue); | |
| 791 | |
| 792 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 793 | |
| 794 if (now < rn->expire) { | |
| 795 return rn->expire - now; | |
| 796 } | |
| 797 | |
| 798 #if (NGX_DEBUG) | |
| 799 { | |
| 800 ngx_str_t s; | |
| 801 | |
| 802 s.len = rn->nlen; | |
| 803 s.data = rn->name; | |
| 804 | |
| 805 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 806 "resolver resend \"%V\" %p", &s, rn->waiting); | |
| 807 } | |
| 808 #endif | |
| 809 | |
| 810 ngx_queue_remove(q); | |
| 811 | |
| 812 if (rn->waiting) { | |
| 813 | |
| 814 if (ngx_resolver_send_query(r, rn) == NGX_OK) { | |
| 815 | |
| 816 rn->expire = now + r->resend_timeout; | |
| 817 | |
| 818 ngx_queue_insert_head(queue, &rn->queue); | |
| 819 | |
| 820 continue; | |
| 821 } | |
| 822 } | |
| 823 | |
| 824 ngx_rbtree_delete(tree, &rn->node); | |
| 825 | |
| 826 ngx_resolver_free_node(r, rn); | |
| 827 } | |
| 828 } | |
| 829 | |
| 830 | |
| 831 static void | |
| 832 ngx_resolver_read_response(ngx_event_t *rev) | |
| 833 { | |
| 834 ssize_t n; | |
| 835 ngx_connection_t *c; | |
| 836 u_char buf[NGX_RESOLVER_UDP_SIZE]; | |
| 837 | |
| 838 c = rev->data; | |
| 839 | |
| 840 do { | |
| 841 n = ngx_recv(c, buf, NGX_RESOLVER_UDP_SIZE); | |
| 842 | |
| 843 if (n == -1) { | |
| 844 return; | |
| 845 } | |
| 846 | |
| 847 ngx_resolver_process_response(c->data, buf, n); | |
| 848 | |
| 849 } while (rev->ready); | |
| 850 } | |
| 851 | |
| 852 | |
| 853 static void | |
| 854 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n) | |
| 855 { | |
| 856 char *err; | |
| 857 size_t len; | |
| 858 ngx_uint_t i, ident, flags, code, nqs, nan, qtype, qclass; | |
| 859 ngx_resolver_qs_t *qs; | |
| 860 ngx_resolver_query_t *query; | |
| 861 | |
| 862 if ((size_t) n < sizeof(ngx_resolver_query_t) + 1) { | |
| 863 goto short_response; | |
| 864 } | |
| 865 | |
| 866 query = (ngx_resolver_query_t *) buf; | |
| 867 | |
| 868 ident = (query->ident_hi << 8) + query->ident_lo; | |
| 869 flags = (query->flags_hi << 8) + query->flags_lo; | |
| 870 nqs = (query->nqs_hi << 8) + query->nqs_lo; | |
| 871 nan = (query->nan_hi << 8) + query->nan_lo; | |
| 872 | |
| 873 ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 874 "resolver DNS response %d fl:%04Xud %d/%d/%d/%d", | |
| 875 ident, flags, nqs, nan, | |
| 876 (query->nns_hi << 8) + query->nns_lo, | |
| 877 (query->nar_hi << 8) + query->nar_lo); | |
| 878 | |
| 879 if (!(flags & 0x8000)) { | |
| 880 ngx_log_error(r->log_level, r->log, 0, | |
| 881 "invalid DNS response %d fl:%04Xud", ident, flags); | |
| 882 return; | |
| 883 } | |
| 884 | |
| 885 code = flags & 0x7f; | |
| 886 | |
| 887 if (code == NGX_RESOLVE_FORMERR || code > NGX_RESOLVE_REFUSED) { | |
| 888 ngx_log_error(r->log_level, r->log, 0, | |
| 889 "DNS error (%d: %s), query id:%d", | |
| 890 code, ngx_resolver_strerror(code), ident); | |
| 891 return; | |
| 892 } | |
| 893 | |
| 894 if (nqs != 1) { | |
| 895 err = "invalid number of questions in DNS response"; | |
| 896 goto done; | |
| 897 } | |
| 898 | |
| 899 if (code == 0 && nan == 0) { | |
| 900 err = "no answers in DNS response"; | |
| 901 goto done; | |
| 902 } | |
| 903 | |
| 904 i = sizeof(ngx_resolver_query_t); | |
| 905 | |
| 906 while (i < (ngx_uint_t) n) { | |
| 907 if (buf[i] == '\0') { | |
| 908 goto found; | |
| 909 } | |
| 910 | |
| 911 len = buf[i]; | |
| 912 i += 1 + len; | |
| 913 } | |
| 914 | |
| 915 goto short_response; | |
| 916 | |
| 917 found: | |
| 918 | |
| 919 if (i++ == 0) { | |
| 920 err = "zero-length domain name in DNS response"; | |
| 921 goto done; | |
| 922 } | |
| 923 | |
| 924 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t)) | |
| 925 > (ngx_uint_t) n) | |
| 926 { | |
| 927 goto short_response; | |
| 928 } | |
| 929 | |
| 930 qs = (ngx_resolver_qs_t *) &buf[i]; | |
| 931 | |
| 932 qtype = (qs->type_hi << 8) + qs->type_lo; | |
| 933 qclass = (qs->class_hi << 8) + qs->class_lo; | |
| 934 | |
| 935 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 936 "resolver DNS response qt:%d cl:%d", qtype, qclass); | |
| 937 | |
| 938 if (qclass != 1) { | |
| 939 ngx_log_error(r->log_level, r->log, 0, | |
| 940 "unknown query class %d in DNS response", qclass); | |
| 941 return; | |
| 942 } | |
| 943 | |
| 944 switch (qtype) { | |
| 945 | |
| 946 case NGX_RESOLVE_A: | |
| 947 | |
| 948 ngx_resolver_process_a(r, buf, n, ident, code, nan, | |
| 949 i + sizeof(ngx_resolver_qs_t)); | |
| 950 | |
| 951 break; | |
| 952 | |
| 953 case NGX_RESOLVE_PTR: | |
| 954 | |
| 955 ngx_resolver_process_ptr(r, buf, n, ident, code); | |
| 956 | |
| 957 break; | |
| 958 | |
| 959 default: | |
| 960 ngx_log_error(r->log_level, r->log, 0, | |
| 961 "unknown query type %d in DNS response", qtype); | |
| 962 return; | |
| 963 } | |
| 964 | |
| 965 return; | |
| 966 | |
| 967 short_response: | |
| 968 | |
| 969 err = "short dns response"; | |
| 970 | |
| 971 done: | |
| 972 | |
| 973 ngx_log_error(r->log_level, r->log, 0, err); | |
| 974 | |
| 975 return; | |
| 976 } | |
| 977 | |
| 978 | |
| 979 static void | |
| 980 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last, | |
| 981 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans) | |
| 583 | 982 { |
| 1649 | 983 char *err; |
| 984 u_char *cname; | |
| 985 size_t len; | |
| 986 uint32_t hash; | |
| 987 in_addr_t addr, *addrs; | |
| 988 ngx_str_t name; | |
| 989 ngx_uint_t qtype, qident, naddrs, a, i, n, start; | |
| 990 ngx_resolver_an_t *an; | |
| 991 ngx_resolver_ctx_t *ctx, *next; | |
| 992 ngx_resolver_node_t *rn; | |
| 993 | |
| 994 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) { | |
| 995 return; | |
| 996 } | |
| 997 | |
| 998 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); | |
| 999 | |
| 1000 hash = ngx_crc32_short(name.data, name.len); | |
| 1001 | |
| 1002 /* lock name mutex */ | |
| 1003 | |
| 1004 rn = ngx_resolver_lookup_name(r, &name, hash); | |
| 1005 | |
| 1006 if (rn == NULL || rn->query == NULL) { | |
| 1007 ngx_log_error(r->log_level, r->log, 0, | |
| 1008 "unexpected response for %V", &name); | |
| 1009 goto failed; | |
| 1010 } | |
| 1011 | |
| 1012 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 1013 | |
| 1014 if (ident != qident) { | |
| 1015 ngx_log_error(r->log_level, r->log, 0, | |
| 1016 "wrong ident %d response for %V, expect %d", | |
| 1017 ident, &name, qident); | |
| 1018 goto failed; | |
| 1019 } | |
| 1020 | |
| 1021 if (code) { | |
| 1022 next = rn->waiting; | |
| 1023 rn->waiting = NULL; | |
| 1024 | |
| 1025 ngx_queue_remove(&rn->queue); | |
| 1026 | |
| 1027 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 1028 | |
| 1029 ngx_resolver_free_node(r, rn); | |
| 1030 | |
| 1031 /* unlock name mutex */ | |
| 1032 | |
| 1033 while (next) { | |
| 1034 ctx = next; | |
| 1035 ctx->state = code; | |
| 1036 next = ctx->next; | |
| 1037 | |
| 1038 ctx->handler(ctx); | |
| 1039 } | |
| 1040 | |
| 1041 return; | |
| 1042 } | |
| 1043 | |
| 1044 i = ans; | |
| 1045 naddrs = 0; | |
| 1046 addr = 0; | |
| 1047 addrs = NULL; | |
| 1048 cname = NULL; | |
| 1049 qtype = 0; | |
| 1050 | |
| 1051 for (a = 0; a < nan; a++) { | |
| 1052 | |
| 1053 start = i; | |
| 1054 | |
| 1055 while (i < last) { | |
| 1056 | |
| 1057 if (buf[i] & 0xc0) { | |
| 1058 i += 2; | |
| 1059 goto found; | |
| 1060 } | |
| 1061 | |
| 1062 if (buf[i] == 0) { | |
| 1063 i++; | |
| 1064 goto test_length; | |
| 1065 } | |
| 1066 | |
| 1067 i += 1 + buf[i]; | |
| 1068 } | |
| 1069 | |
| 1070 goto short_response; | |
| 1071 | |
| 1072 test_length: | |
| 1073 | |
| 1074 if (i - start < 2) { | |
| 1075 err = "invalid name in dns response"; | |
| 1076 goto invalid; | |
| 1077 } | |
| 1078 | |
| 1079 found: | |
| 1080 | |
| 1081 if (i + sizeof(ngx_resolver_an_t) >= last) { | |
| 1082 goto short_response; | |
| 1083 } | |
| 1084 | |
| 1085 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1086 | |
| 1087 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1088 len = (an->len_hi << 8) + an->len_lo; | |
| 1089 | |
| 1090 if (qtype == NGX_RESOLVE_A) { | |
| 1091 | |
| 1092 i += sizeof(ngx_resolver_an_t); | |
| 1093 | |
| 1094 if (i + len > last) { | |
| 1095 goto short_response; | |
| 1096 } | |
| 1097 | |
| 1098 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1099 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1100 | |
| 1101 naddrs++; | |
| 1102 | |
| 1103 i += len; | |
| 1104 | |
| 1105 } else if (qtype == NGX_RESOLVE_CNAME) { | |
| 1106 cname = &buf[i] + sizeof(ngx_resolver_an_t); | |
| 1107 i += sizeof(ngx_resolver_an_t) + len; | |
| 1108 } | |
| 1109 } | |
| 1110 | |
| 1111 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1112 "resolver naddrs:%ui cname:%p", naddrs, cname); | |
| 1113 | |
| 1114 if (naddrs) { | |
| 1115 | |
| 1116 if (naddrs == 1) { | |
| 1117 rn->u.addr = addr; | |
| 1118 | |
| 1119 } else { | |
| 1120 | |
| 1121 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t)); | |
| 1122 if (addrs == NULL) { | |
| 1123 return; | |
| 1124 } | |
| 1125 | |
| 1126 n = 0; | |
| 1127 i = ans; | |
| 1128 | |
| 1129 for (a = 0; a < nan; a++) { | |
| 1130 | |
| 1131 for ( ;; ) { | |
| 1132 | |
| 1133 if (buf[i] & 0xc0) { | |
| 1134 i += 2; | |
| 1135 goto ok; | |
| 1136 } | |
| 1137 | |
| 1138 if (buf[i] == 0) { | |
| 1139 i++; | |
| 1140 goto ok; | |
| 1141 } | |
| 1142 | |
| 1143 i += 1 + buf[i]; | |
| 1144 } | |
| 1145 | |
| 1146 ok: | |
| 1147 | |
| 1148 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1149 | |
| 1150 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1151 len = (an->len_hi << 8) + an->len_lo; | |
| 1152 | |
| 1153 i += sizeof(ngx_resolver_an_t); | |
| 1154 | |
| 1155 if (qtype == NGX_RESOLVE_A) { | |
| 1156 | |
| 1157 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1158 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1159 | |
| 1160 if (n == naddrs) { | |
| 1161 break; | |
| 1162 } | |
| 1163 } | |
| 1164 | |
| 1165 i += len; | |
| 1166 } | |
| 1167 | |
| 1168 rn->u.addrs = addrs; | |
| 1169 | |
| 1170 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
| 1171 naddrs * sizeof(in_addr_t)); | |
| 1172 if (addrs == NULL) { | |
| 1173 return; | |
| 1174 } | |
| 1175 } | |
| 1176 | |
| 1177 rn->naddrs = (u_short) naddrs; | |
| 1178 | |
| 1179 ngx_queue_remove(&rn->queue); | |
| 1180 | |
| 1181 rn->valid = ngx_time() + r->valid; | |
| 1182 rn->expire = ngx_time() + r->expire; | |
| 1183 | |
| 1184 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1185 | |
| 1186 next = rn->waiting; | |
| 1187 rn->waiting = NULL; | |
| 1188 | |
| 1189 /* unlock name mutex */ | |
| 1190 | |
| 1191 while (next) { | |
| 1192 ctx = next; | |
| 1193 ctx->state = NGX_OK; | |
| 1194 ctx->naddrs = naddrs; | |
| 1195 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 1196 ctx->addr = addr; | |
| 1197 next = ctx->next; | |
| 1198 | |
| 1199 ctx->handler(ctx); | |
| 1200 } | |
| 1201 | |
| 1202 if (naddrs) { | |
| 1203 ngx_resolver_free(r, addrs); | |
| 1204 } | |
| 1205 | |
| 1206 return; | |
| 1207 | |
| 1208 } else if (cname) { | |
| 1209 | |
| 1210 /* CNAME only */ | |
| 1211 | |
| 1212 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) { | |
| 1213 return; | |
| 1214 } | |
| 1215 | |
| 1216 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1217 "resolver cname:\"%V\"", &name); | |
| 1218 | |
| 1219 rn->cnlen = (u_short) name.len; | |
| 1220 rn->u.cname = name.data; | |
| 1221 rn->valid = ngx_time() + r->valid; | |
| 1222 rn->expire = ngx_time() + r->expire; | |
| 1223 | |
| 1224 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1225 | |
| 1226 ctx = rn->waiting; | |
| 1227 rn->waiting = NULL; | |
| 1228 | |
| 1229 if (ctx) { | |
| 1230 ctx->name = name; | |
| 1231 | |
| 1232 (void) ngx_resolve_name_locked(r, ctx); | |
| 1233 } | |
| 1234 | |
| 1235 return; | |
| 1236 } | |
| 1237 | |
| 1238 ngx_log_error(r->log_level, r->log, 0, | |
| 1239 "no A or CNAME types in DNS responses, unknown query type: %d", | |
| 1240 qtype); | |
| 1241 return; | |
| 1242 | |
| 1243 short_response: | |
| 1244 | |
| 1245 err = "short dns response"; | |
| 1246 | |
| 1247 invalid: | |
| 1248 | |
| 1249 /* unlock name mutex */ | |
| 1250 | |
| 1251 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1252 | |
| 1253 return; | |
| 1254 | |
| 1255 failed: | |
| 1256 | |
| 1257 /* unlock name mutex */ | |
| 1258 | |
| 1259 return; | |
| 1260 } | |
| 1261 | |
| 1262 | |
| 1263 static void | |
| 1264 ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, | |
| 1265 ngx_uint_t ident, ngx_uint_t code) | |
| 1266 { | |
| 1267 char *err; | |
| 1268 size_t len; | |
| 1269 in_addr_t addr; | |
| 1270 ngx_int_t digit; | |
| 1271 ngx_str_t name; | |
| 1272 ngx_uint_t i, mask, qtype, qclass, qident; | |
| 1273 ngx_resolver_an_t *an; | |
| 1274 ngx_resolver_ctx_t *ctx, *next; | |
| 1275 ngx_resolver_node_t *rn; | |
| 1276 | |
| 1277 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) { | |
| 1278 goto invalid_in_addr_arpa; | |
| 1279 } | |
| 1280 | |
| 1281 addr = 0; | |
| 1282 i = 12; | |
| 1283 | |
| 1284 for (mask = 0; mask < 32; mask += 8) { | |
| 1285 len = buf[i++]; | |
| 1286 | |
| 1287 digit = ngx_atoi(&buf[i], len); | |
| 1288 if (digit == NGX_ERROR || digit > 255) { | |
| 1289 goto invalid_in_addr_arpa; | |
| 1290 } | |
| 1291 | |
| 1292 addr += digit << mask; | |
| 1293 i += len; | |
| 1294 } | |
| 1295 | |
| 1296 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) { | |
| 1297 goto invalid_in_addr_arpa; | |
| 1298 } | |
| 1299 | |
| 1300 /* lock addr mutex */ | |
| 1301 | |
| 1302 rn = ngx_resolver_lookup_addr(r, addr); | |
| 1303 | |
| 1304 if (rn == NULL || rn->query == NULL) { | |
| 1305 ngx_log_error(r->log_level, r->log, 0, | |
| 1306 "unexpected response for %ud.%ud.%ud.%ud", | |
| 1307 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 1308 (addr >> 8) & 0xff, addr & 0xff); | |
| 1309 goto failed; | |
| 1310 } | |
| 1311 | |
| 1312 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 1313 | |
| 1314 if (ident != qident) { | |
| 1315 ngx_log_error(r->log_level, r->log, 0, | |
| 1316 "wrong ident %d response for %ud.%ud.%ud.%ud, expect %d", | |
| 1317 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 1318 (addr >> 8) & 0xff, addr & 0xff, qident); | |
| 1319 goto failed; | |
| 1320 } | |
| 1321 | |
| 1322 if (code) { | |
| 1323 next = rn->waiting; | |
| 1324 rn->waiting = NULL; | |
| 1325 | |
| 1326 ngx_queue_remove(&rn->queue); | |
| 1327 | |
| 1328 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 1329 | |
| 1330 ngx_resolver_free_node(r, rn); | |
| 1331 | |
| 1332 /* unlock addr mutex */ | |
| 1333 | |
| 1334 while (next) { | |
| 1335 ctx = next; | |
| 1336 ctx->state = code; | |
| 1337 next = ctx->next; | |
| 1338 | |
| 1339 ctx->handler(ctx); | |
| 1340 } | |
| 1341 | |
| 1342 return; | |
| 1343 } | |
| 1344 | |
| 1345 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t); | |
| 1346 | |
| 1347 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) { | |
| 1348 goto short_response; | |
| 1349 } | |
| 1350 | |
| 1351 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */ | |
| 1352 | |
| 1353 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) { | |
| 1354 err = "invalid in-addr.arpa name in DNS response"; | |
| 1355 goto invalid; | |
| 1356 } | |
| 1357 | |
| 1358 an = (ngx_resolver_an_t *) &buf[i + 2]; | |
| 1359 | |
| 1360 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1361 qclass = (an->class_hi << 8) + an->class_lo; | |
| 1362 len = (an->len_hi << 8) + an->len_lo; | |
| 1363 | |
| 1364 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1365 "resolver qt:%d cl:%d len:%uz", qtype, qclass, len); | |
| 1366 | |
| 1367 i += 2 + sizeof(ngx_resolver_an_t); | |
| 1368 | |
| 1369 if (i + len > (ngx_uint_t) n) { | |
| 1370 goto short_response; | |
| 1371 } | |
| 1372 | |
| 1373 len -= 2; | |
| 1374 | |
| 1375 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) { | |
| 1376 return; | |
| 1377 } | |
| 1378 | |
| 1379 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name); | |
| 1380 | |
| 1381 if (len != (size_t) rn->nlen || ngx_strncmp(name.data, rn->name, len) != 0) | |
| 1382 { | |
| 1383 ngx_resolver_free(r, rn->name); | |
| 1384 rn->name = name.data; | |
| 1385 | |
| 1386 name.data = ngx_resolver_dup(r, rn->name, len); | |
| 1387 if (name.data == NULL) { | |
| 1388 goto failed; | |
| 1389 } | |
| 1390 } | |
| 1391 | |
| 1392 ngx_queue_remove(&rn->queue); | |
| 1393 | |
| 1394 rn->valid = ngx_time() + r->valid; | |
| 1395 rn->expire = ngx_time() + r->expire; | |
| 1396 | |
| 1397 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
| 1398 | |
| 1399 next = rn->waiting; | |
| 1400 rn->waiting = NULL; | |
| 1401 | |
| 1402 /* unlock addr mutex */ | |
| 1403 | |
| 1404 while (next) { | |
| 1405 ctx = next; | |
| 1406 ctx->state = NGX_OK; | |
| 1407 ctx->name = name; | |
| 1408 next = ctx->next; | |
| 1409 | |
| 1410 ctx->handler(ctx); | |
| 1411 } | |
| 1412 | |
| 1413 ngx_resolver_free(r, name.data); | |
| 1414 | |
| 1415 return; | |
| 1416 | |
| 1417 invalid_in_addr_arpa: | |
| 1418 | |
| 1419 ngx_log_error(r->log_level, r->log, 0, | |
| 1420 "invalid in-addr.arpa name in DNS response"); | |
| 1421 return; | |
| 1422 | |
| 1423 short_response: | |
| 1424 | |
| 1425 err = "short DNS response"; | |
| 1426 | |
| 1427 invalid: | |
| 1428 | |
| 1429 /* unlock addr mutex */ | |
| 1430 | |
| 1431 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1432 | |
| 1433 return; | |
| 1434 | |
| 1435 failed: | |
| 1436 | |
| 1437 /* unlock addr mutex */ | |
| 1438 | |
| 1439 return; | |
| 1440 } | |
| 1441 | |
| 1442 | |
| 1443 static ngx_resolver_node_t * | |
| 1444 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) | |
| 1445 { | |
| 1446 ngx_int_t rc; | |
| 1447 size_t len; | |
| 1448 ngx_rbtree_node_t *node, *sentinel; | |
| 1449 ngx_resolver_node_t *rn; | |
| 1450 | |
| 1451 node = r->name_rbtree.root; | |
| 1452 sentinel = r->name_rbtree.sentinel; | |
| 1453 | |
| 1454 while (node != sentinel) { | |
| 1455 | |
| 1456 if (hash < node->key) { | |
| 1457 node = node->left; | |
| 1458 continue; | |
| 1459 } | |
| 1460 | |
| 1461 if (hash > node->key) { | |
| 1462 node = node->right; | |
| 1463 continue; | |
| 1464 } | |
| 1465 | |
| 1466 /* hash == node->key */ | |
| 1467 | |
| 1468 do { | |
| 1469 rn = (ngx_resolver_node_t *) node; | |
| 1470 | |
| 1471 len = (name->len > (size_t) rn->nlen) ? rn->nlen : name->len; | |
| 1472 | |
| 1473 rc = ngx_strncmp(name->data, rn->name, len); | |
| 1474 | |
| 1475 if (rc == 0) { | |
| 1476 return rn; | |
| 1477 } | |
| 1478 | |
| 1479 node = (rc < 0) ? node->left : node->right; | |
| 1480 | |
| 1481 } while (node != sentinel && hash == node->key); | |
| 1482 | |
| 1483 break; | |
| 1484 } | |
| 1485 | |
| 1486 /* not found */ | |
| 1487 | |
| 1488 return NULL; | |
| 1489 } | |
| 1490 | |
| 1491 | |
| 1492 static ngx_resolver_node_t * | |
| 1493 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr) | |
| 1494 { | |
| 1495 ngx_rbtree_node_t *node, *sentinel; | |
| 1496 | |
| 1497 node = r->addr_rbtree.root; | |
| 1498 sentinel = r->addr_rbtree.sentinel; | |
| 1499 | |
| 1500 while (node != sentinel) { | |
| 1501 | |
| 1502 if (addr < node->key) { | |
| 1503 node = node->left; | |
| 1504 continue; | |
| 1505 } | |
| 1506 | |
| 1507 if (addr > node->key) { | |
| 1508 node = node->right; | |
| 1509 continue; | |
| 1510 } | |
| 1511 | |
| 1512 /* addr == node->key */ | |
| 1513 | |
| 1514 return (ngx_resolver_node_t *) node; | |
| 1515 } | |
| 1516 | |
| 1517 /* not found */ | |
| 1518 | |
| 1519 return NULL; | |
| 1520 } | |
| 1521 | |
| 1522 | |
| 1523 static void | |
| 1524 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
| 1525 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
| 1526 { | |
| 1527 size_t len; | |
| 1528 ngx_rbtree_node_t **p; | |
| 1529 ngx_resolver_node_t *rn, *rn_temp; | |
| 1530 | |
| 1531 for ( ;; ) { | |
| 1532 | |
| 1533 if (node->key < temp->key) { | |
| 1534 | |
| 1535 p = &temp->left; | |
| 1536 | |
| 1537 } else if (node->key > temp->key) { | |
| 1538 | |
| 1539 p = &temp->right; | |
| 1540 | |
| 1541 } else { /* node->key == temp->key */ | |
| 1542 | |
| 1543 rn = (ngx_resolver_node_t *) node; | |
| 1544 rn_temp = (ngx_resolver_node_t *) temp; | |
| 1545 | |
| 1546 len = (rn->nlen > rn_temp->nlen) ? rn_temp->nlen : rn->nlen; | |
| 1547 | |
| 1548 p = (ngx_strncmp(rn->name, rn_temp->name, len) < 0) | |
| 1549 ? &temp->left : &temp->right; | |
| 1550 } | |
| 1551 | |
| 1552 if (*p == sentinel) { | |
| 1553 break; | |
| 1554 } | |
| 1555 | |
| 1556 temp = *p; | |
| 1557 } | |
| 1558 | |
| 1559 *p = node; | |
| 1560 node->parent = temp; | |
| 1561 node->left = sentinel; | |
| 1562 node->right = sentinel; | |
| 1563 ngx_rbt_red(node); | |
| 1564 } | |
| 1565 | |
| 1566 | |
| 1567 static ngx_int_t | |
| 1568 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1569 { | |
| 1570 u_char *p, *s; | |
| 1571 size_t len; | |
| 1572 ngx_uint_t ident; | |
| 1573 ngx_resolver_qs_t *qs; | |
| 1574 ngx_resolver_query_t *query; | |
| 1575 | |
| 1576 len = sizeof(ngx_resolver_query_t) | |
| 1577 + 1 + ctx->name.len + 1 + sizeof(ngx_resolver_qs_t); | |
| 1578 | |
| 1579 p = ngx_resolver_calloc(ctx->resolver, len); | |
| 1580 if (p == NULL) { | |
| 1581 return NGX_ERROR; | |
| 1582 } | |
| 1583 | |
| 1584 rn->qlen = (u_short) len; | |
| 1585 rn->query = p; | |
| 1586 | |
| 1587 query = (ngx_resolver_query_t *) p; | |
| 1588 | |
| 1589 ident = ngx_random(); | |
| 1590 | |
| 1591 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0, | |
| 1592 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff); | |
| 1593 | |
| 1594 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1595 query->ident_lo = (u_char) (ident & 0xff); | |
| 1596 | |
| 1597 /* recursion query */ | |
| 1598 query->flags_hi = 1; query->flags_lo = 0; | |
| 1599 | |
| 1600 /* one question */ | |
| 1601 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1602 query->nan_hi = 0; query->nan_lo = 0; | |
| 1603 query->nns_hi = 0; query->nns_lo = 0; | |
| 1604 query->nar_hi = 0; query->nar_lo = 0; | |
| 1605 | |
| 1606 p += sizeof(ngx_resolver_query_t) + 1 + ctx->name.len + 1; | |
| 1607 | |
| 1608 qs = (ngx_resolver_qs_t *) p; | |
| 1609 | |
| 1610 /* query type */ | |
| 1611 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type; | |
| 1612 | |
| 1613 /* IP query class */ | |
| 1614 qs->class_hi = 0; qs->class_lo = 1; | |
| 1615 | |
| 1616 /* convert "www.example.com" to "\3www\7example\3com\0" */ | |
| 1617 | |
| 1618 len = 0; | |
| 1619 p--; | |
| 1620 *p-- = '\0'; | |
| 1621 | |
| 1622 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) { | |
| 1623 if (*s != '.') { | |
| 1624 *p = *s; | |
| 1625 len++; | |
| 1626 | |
| 1627 } else { | |
| 1628 *p = (u_char) len; | |
| 1629 len = 0; | |
| 1630 } | |
| 1631 | |
| 1632 p--; | |
| 1633 } | |
| 1634 | |
| 1635 *p = (u_char) len; | |
| 1636 | |
| 1637 return NGX_OK; | |
| 1638 } | |
| 1639 | |
| 1640 | |
| 1641 /* AF_INET only */ | |
| 1642 | |
| 1643 static ngx_int_t | |
| 1644 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1645 { | |
| 1646 u_char *p, *d; | |
| 1647 size_t len; | |
| 1648 ngx_int_t n; | |
| 1649 ngx_uint_t ident; | |
| 1650 ngx_resolver_query_t *query; | |
| 1651 | |
| 1652 len = sizeof(ngx_resolver_query_t) | |
| 1653 + sizeof(".255.255.255.255.in-addr.arpa.") - 1 | |
| 1654 + sizeof(ngx_resolver_qs_t); | |
| 1655 | |
| 1656 p = ngx_resolver_calloc(ctx->resolver, len); | |
| 1657 if (p == NULL) { | |
| 1658 return NGX_ERROR; | |
| 1659 } | |
| 1660 | |
| 1661 rn->query = p; | |
| 1662 query = (ngx_resolver_query_t *) p; | |
| 1663 | |
| 1664 ident = ngx_random(); | |
| 1665 | |
| 1666 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1667 query->ident_lo = (u_char) (ident & 0xff); | |
| 1668 | |
| 1669 /* recursion query */ | |
| 1670 query->flags_hi = 1; query->flags_lo = 0; | |
| 1671 | |
| 1672 /* one question */ | |
| 1673 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1674 query->nan_hi = 0; query->nan_lo = 0; | |
| 1675 query->nns_hi = 0; query->nns_lo = 0; | |
| 1676 query->nar_hi = 0; query->nar_lo = 0; | |
| 1677 | |
| 1678 p += sizeof(ngx_resolver_query_t); | |
| 1679 | |
| 1680 for (n = 0; n < 32; n += 8){ | |
| 1681 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff); | |
| 1682 *p = (u_char) (d - &p[1]); | |
| 1683 p = d; | |
| 1684 } | |
| 1685 | |
| 1686 /* query type "PTR", IP query class */ | |
| 1687 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18); | |
| 1688 | |
| 1689 rn->qlen = (u_short) | |
| 1690 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t) | |
| 1691 - rn->query); | |
| 1692 | |
| 1693 return NGX_OK; | |
| 1694 } | |
| 1695 | |
| 1696 | |
| 1697 static ngx_int_t | |
| 1698 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src, | |
| 1699 u_char *last) | |
| 1700 { | |
| 1701 char *err; | |
| 1702 u_char *p, *dst; | |
| 1703 ssize_t len; | |
| 1704 ngx_uint_t i, n; | |
| 1705 | |
| 1706 p = src; | |
| 1707 len = -1; | |
| 1708 | |
| 1709 /* | |
| 1710 * compression pointers allow to create endless loop, so we set limit; | |
| 1711 * 128 pointers should be enough to store 255-byte name | |
| 1712 */ | |
| 1713 | |
| 1714 for (i = 0; i < 128; i++) { | |
| 1715 n = *p++; | |
| 1716 | |
| 1717 if (n == 0) { | |
| 1718 goto done; | |
| 1719 } | |
| 1720 | |
| 1721 if (n & 0xc0) { | |
| 1722 n = (n & 0x3f << 8) + *p; | |
| 1723 p = &buf[n]; | |
| 1724 | |
| 1725 } else { | |
| 1726 len += 1 + n; | |
| 1727 p = &p[n]; | |
| 1728 } | |
| 1729 | |
| 1730 if (p >= last) { | |
| 1731 err = "name is out of response"; | |
| 1732 goto invalid; | |
| 1733 } | |
| 1734 } | |
| 1735 | |
| 1736 err = "compression pointers loop"; | |
| 1737 | |
| 1738 invalid: | |
| 1739 | |
| 1740 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1741 | |
| 1742 return NGX_ERROR; | |
| 1743 | |
| 1744 done: | |
| 1745 | |
| 1746 if (name == NULL) { | |
| 583 | 1747 return NGX_OK; |
| 1748 } | |
| 1749 | |
| 1649 | 1750 dst = ngx_resolver_alloc(r, len); |
| 1751 if (dst == NULL) { | |
| 1752 return NGX_ERROR; | |
| 1753 } | |
| 1754 | |
| 1755 name->data = dst; | |
| 1756 | |
| 1757 n = *src++; | |
| 1758 | |
| 1759 for ( ;; ) { | |
| 1760 if (n != 0xc0) { | |
| 1761 ngx_memcpy(dst, src, n); | |
| 1762 dst += n; | |
| 1763 src += n; | |
| 1764 | |
| 1765 n = *src++; | |
| 1766 | |
| 1767 if (n != 0) { | |
| 1768 *dst++ = '.'; | |
| 1769 } | |
| 1770 | |
| 1771 } else { | |
| 1772 n = (n & 0x3f << 8) + *src; | |
| 1773 src = &buf[n]; | |
| 1774 | |
| 1775 n = *src++; | |
| 1776 } | |
| 1777 | |
| 1778 if (n == 0) { | |
| 1779 name->len = dst - name->data; | |
| 1780 return NGX_OK; | |
| 1781 } | |
| 1782 } | |
| 1783 } | |
| 1784 | |
| 1785 | |
| 1786 static void | |
| 1787 ngx_resolver_timeout_handler(ngx_event_t *ev) | |
| 1788 { | |
| 1789 ngx_resolver_ctx_t *ctx; | |
| 1790 | |
| 1791 ctx = ev->data; | |
| 1792 | |
| 1793 ctx->state = NGX_RESOLVE_TIMEDOUT; | |
| 1794 | |
| 1795 ctx->handler(ctx); | |
| 1796 } | |
| 1797 | |
| 1798 | |
| 1799 static void | |
| 1800 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 1801 { | |
| 1802 /* lock alloc mutex */ | |
| 1803 | |
| 1804 if (rn->query) { | |
| 1805 ngx_resolver_free_locked(r, rn->query); | |
| 1806 } | |
| 1807 | |
| 1808 if (rn->name) { | |
| 1809 ngx_resolver_free_locked(r, rn->name); | |
| 1810 } | |
| 1811 | |
| 1812 if (rn->cnlen) { | |
| 1813 ngx_resolver_free_locked(r, rn->u.cname); | |
| 1814 } | |
| 1815 | |
| 1816 if (rn->naddrs > 1) { | |
| 1817 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 1818 } | |
| 1819 | |
| 1820 ngx_resolver_free_locked(r, rn); | |
| 1821 | |
| 1822 /* unlock alloc mutex */ | |
| 1823 } | |
| 1824 | |
| 1825 | |
| 1826 static void * | |
| 1827 ngx_resolver_alloc(ngx_resolver_t *r, size_t size) | |
| 1828 { | |
| 1829 u_char *p; | |
| 1830 | |
| 1831 /* lock alloc mutex */ | |
| 1832 | |
| 1833 p = ngx_alloc(size, r->log); | |
| 1834 | |
| 1835 /* unlock alloc mutex */ | |
| 1836 | |
| 1837 return p; | |
| 1838 } | |
| 1839 | |
| 1840 | |
| 1841 void * | |
| 1842 ngx_resolver_calloc(ngx_resolver_t *r, size_t size) | |
| 1843 { | |
| 1844 u_char *p; | |
| 1845 | |
| 1846 p = ngx_resolver_alloc(r, size); | |
| 1847 | |
| 1848 if (p) { | |
| 1849 ngx_memzero(p, size); | |
| 1850 } | |
| 1851 | |
| 1852 return p; | |
| 1853 } | |
| 1854 | |
| 1855 | |
| 1856 static void | |
| 1857 ngx_resolver_free(ngx_resolver_t *r, void *p) | |
| 1858 { | |
| 1859 /* lock alloc mutex */ | |
| 1860 | |
| 1861 ngx_free(p); | |
| 1862 | |
| 1863 /* unlock alloc mutex */ | |
| 1864 } | |
| 1865 | |
| 1866 | |
| 1867 static void | |
| 1868 ngx_resolver_free_locked(ngx_resolver_t *r, void *p) | |
| 1869 { | |
| 1870 ngx_free(p); | |
| 1871 } | |
| 1872 | |
| 1873 | |
| 1874 static void * | |
| 1875 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size) | |
| 1876 { | |
| 1877 void *dst; | |
| 1878 | |
| 1879 dst = ngx_resolver_alloc(r, size); | |
| 1880 | |
| 1881 if (dst == NULL) { | |
| 1882 return dst; | |
| 1883 } | |
| 1884 | |
| 1885 ngx_memcpy(dst, src, size); | |
| 1886 | |
| 1887 return dst; | |
| 1888 } | |
| 1889 | |
| 1890 | |
| 1891 char * | |
| 1892 ngx_resolver_strerror(ngx_int_t err) | |
| 1893 { | |
| 1894 static char *errors[] = { | |
| 1895 "Format error", /* FORMERR */ | |
| 1896 "Server failure", /* SERVFAIL */ | |
| 1897 "Host not found", /* NXDOMAIN */ | |
| 1898 "Unimplemented", /* NOTIMP */ | |
| 1899 "Operation refused" /* REFUSED */ | |
| 1900 }; | |
| 1901 | |
| 1902 if (err > 0 && err < 6) { | |
| 1903 return errors[err - 1]; | |
| 1904 } | |
| 1905 | |
| 1906 if (err == NGX_RESOLVE_TIMEDOUT) { | |
| 1907 return "Operation timed out"; | |
| 1908 } | |
| 1909 | |
| 1910 return "Unknown error"; | |
| 1911 } | |
| 1912 | |
| 1913 | |
| 1914 ngx_int_t | |
| 1915 ngx_udp_connect(ngx_udp_connection_t *uc) | |
| 1916 { | |
| 1917 int rc; | |
| 1918 ngx_int_t event; | |
| 1919 ngx_event_t *rev, *wev; | |
| 1920 ngx_socket_t s; | |
| 1921 ngx_connection_t *c; | |
| 1922 | |
| 583 | 1923 s = ngx_socket(AF_INET, SOCK_DGRAM, 0); |
| 1924 | |
| 1649 | 1925 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, uc->log, 0, "UDP socket %d", s); |
| 583 | 1926 |
| 1927 if (s == -1) { | |
| 1649 | 1928 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
| 583 | 1929 ngx_socket_n " failed"); |
| 1930 return NGX_ERROR; | |
| 1931 } | |
| 1932 | |
| 1649 | 1933 c = ngx_get_connection(s, uc->log); |
| 583 | 1934 |
| 1935 if (c == NULL) { | |
| 1936 if (ngx_close_socket(s) == -1) { | |
| 1649 | 1937 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
| 583 | 1938 ngx_close_socket_n "failed"); |
| 1939 } | |
| 1940 | |
| 1941 return NGX_ERROR; | |
| 1942 } | |
| 1943 | |
| 1649 | 1944 if (ngx_nonblocking(s) == -1) { |
| 1945 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
| 1946 ngx_nonblocking_n " failed"); | |
| 1947 | |
| 1948 ngx_free_connection(c); | |
| 1949 | |
| 1950 if (ngx_close_socket(s) == -1) { | |
| 1951 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
| 1952 ngx_close_socket_n " failed"); | |
| 1953 } | |
| 1954 | |
| 1955 return NGX_ERROR; | |
| 1956 } | |
| 1957 | |
| 583 | 1958 rev = c->read; |
| 1959 wev = c->write; | |
| 1960 | |
| 1649 | 1961 rev->log = uc->log; |
| 1962 wev->log = uc->log; | |
| 1963 | |
| 1964 uc->connection = c; | |
| 583 | 1965 |
| 1966 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); | |
| 1967 | |
| 1968 #if (NGX_THREADS) | |
| 1649 | 1969 |
| 1970 /* TODO: lock event when call completion handler */ | |
| 1971 | |
| 1972 rev->lock = &c->lock; | |
| 1973 wev->lock = &c->lock; | |
| 583 | 1974 rev->own_lock = &c->lock; |
| 1975 wev->own_lock = &c->lock; | |
| 1649 | 1976 |
| 583 | 1977 #endif |
| 1978 | |
| 1649 | 1979 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, uc->log, 0, |
| 1980 "connect to %V, fd:%d #%d", &uc->server, s, c->number); | |
| 1981 | |
| 1982 rc = connect(s, uc->sockaddr, uc->socklen); | |
| 1983 | |
| 1984 /* TODO: aio, iocp */ | |
| 583 | 1985 |
| 1986 if (rc == -1) { | |
| 1649 | 1987 ngx_log_error(NGX_LOG_CRIT, uc->log, ngx_socket_errno, |
| 1988 "connect() to %V failed", &uc->server); | |
| 583 | 1989 |
| 1990 return NGX_ERROR; | |
| 1991 } | |
| 1992 | |
| 1649 | 1993 /* UDP sockets are always ready to write */ |
| 1994 wev->ready = 1; | |
| 1995 | |
| 1996 if (ngx_add_event) { | |
| 1997 | |
| 1998 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ? | |
| 1999 /* kqueue, epoll */ NGX_CLEAR_EVENT: | |
| 2000 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT; | |
| 2001 /* eventport event type has no meaning: oneshot only */ | |
| 2002 | |
| 2003 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { | |
| 2004 return NGX_ERROR; | |
| 2005 } | |
| 2006 | |
| 2007 } else { | |
| 2008 /* rtsig */ | |
| 2009 | |
| 583 | 2010 if (ngx_add_conn(c) == NGX_ERROR) { |
| 2011 return NGX_ERROR; | |
| 2012 } | |
| 2013 } | |
| 2014 | |
| 2015 return NGX_OK; | |
| 2016 } |