Mercurial > hg > nginx
annotate src/core/ngx_resolver.c @ 1904:538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Thu, 28 Feb 2008 20:09:39 +0000 |
| parents | 1ea922585517 |
| children | 4a8c9139e579 |
| rev | line source |
|---|---|
| 583 | 1 |
| 2 /* | |
| 3 * Copyright (C) Igor Sysoev | |
| 4 */ | |
| 5 | |
| 6 | |
| 7 #include <ngx_config.h> | |
| 8 #include <ngx_core.h> | |
| 9 #include <ngx_event.h> | |
| 10 | |
| 11 | |
| 1649 | 12 #define NGX_RESOLVER_UDP_SIZE 4096 |
| 13 | |
| 14 | |
| 583 | 15 typedef struct { |
| 1649 | 16 u_char ident_hi; |
| 17 u_char ident_lo; | |
| 18 u_char flags_hi; | |
| 19 u_char flags_lo; | |
| 20 u_char nqs_hi; | |
| 21 u_char nqs_lo; | |
| 22 u_char nan_hi; | |
| 23 u_char nan_lo; | |
| 24 u_char nns_hi; | |
| 25 u_char nns_lo; | |
| 26 u_char nar_hi; | |
| 27 u_char nar_lo; | |
| 28 } ngx_resolver_query_t; | |
| 29 | |
| 30 | |
| 31 typedef struct { | |
| 32 u_char type_hi; | |
| 33 u_char type_lo; | |
| 34 u_char class_hi; | |
| 35 u_char class_lo; | |
| 36 } ngx_resolver_qs_t; | |
| 37 | |
| 38 | |
| 39 typedef struct { | |
| 40 u_char type_hi; | |
| 41 u_char type_lo; | |
| 42 u_char class_hi; | |
| 43 u_char class_lo; | |
| 44 u_char ttl[4]; | |
| 45 u_char len_hi; | |
| 46 u_char len_lo; | |
| 47 } ngx_resolver_an_t; | |
| 48 | |
| 49 | |
| 50 ngx_int_t ngx_udp_connect(ngx_udp_connection_t *uc); | |
| 51 | |
| 52 | |
| 53 static ngx_int_t ngx_resolve_name_locked(ngx_resolver_t *r, | |
| 54 ngx_resolver_ctx_t *ctx); | |
| 55 static void ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
| 56 ngx_queue_t *queue); | |
| 57 static ngx_int_t ngx_resolver_send_query(ngx_resolver_t *r, | |
| 58 ngx_resolver_node_t *rn); | |
| 59 static ngx_int_t ngx_resolver_create_name_query(ngx_resolver_node_t *rn, | |
| 60 ngx_resolver_ctx_t *ctx); | |
| 61 static ngx_int_t ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, | |
| 62 ngx_resolver_ctx_t *ctx); | |
| 63 static void ngx_resolver_resend_handler(ngx_event_t *ev); | |
| 64 static time_t ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
| 65 ngx_queue_t *queue); | |
| 66 static void ngx_resolver_read_response(ngx_event_t *rev); | |
| 67 static void ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, | |
| 68 size_t n); | |
| 69 static void ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t n, | |
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70 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans); |
| 1649 | 71 static void ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, |
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72 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan); |
| 1649 | 73 static ngx_resolver_node_t *ngx_resolver_lookup_name(ngx_resolver_t *r, |
| 74 ngx_str_t *name, uint32_t hash); | |
| 75 static ngx_resolver_node_t *ngx_resolver_lookup_addr(ngx_resolver_t *r, | |
| 76 in_addr_t addr); | |
| 77 static void ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
| 78 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel); | |
| 79 static ngx_int_t ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, | |
| 80 u_char *buf, u_char *src, u_char *last); | |
| 81 static void ngx_resolver_timeout_handler(ngx_event_t *ev); | |
| 82 static void ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn); | |
| 83 static void *ngx_resolver_alloc(ngx_resolver_t *r, size_t size); | |
| 1903 | 84 static void *ngx_resolver_calloc(ngx_resolver_t *r, size_t size); |
| 1649 | 85 static void ngx_resolver_free(ngx_resolver_t *r, void *p); |
| 86 static void ngx_resolver_free_locked(ngx_resolver_t *r, void *p); | |
| 87 static void *ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size); | |
| 88 | |
| 89 | |
| 90 /* STUB: ngx_peer_addr_t * */ | |
| 91 | |
| 92 ngx_resolver_t * | |
| 93 ngx_resolver_create(ngx_peer_addr_t *addr, ngx_log_t *log) | |
| 94 { | |
| 95 ngx_resolver_t *r; | |
| 96 ngx_udp_connection_t *uc; | |
| 97 | |
| 98 r = ngx_calloc(sizeof(ngx_resolver_t), log); | |
| 99 if (r == NULL) { | |
| 100 return NULL; | |
| 101 } | |
| 102 | |
| 103 r->event = ngx_calloc(sizeof(ngx_event_t), log); | |
| 104 if (r->event == NULL) { | |
| 105 return NULL; | |
| 106 } | |
| 107 | |
| 1687 | 108 ngx_rbtree_init(&r->name_rbtree, &r->name_sentinel, |
| 109 ngx_resolver_rbtree_insert_value); | |
| 110 | |
| 111 ngx_rbtree_init(&r->addr_rbtree, &r->addr_sentinel, | |
| 112 ngx_rbtree_insert_value); | |
| 1649 | 113 |
| 1685 | 114 ngx_queue_init(&r->name_resend_queue); |
| 115 ngx_queue_init(&r->addr_resend_queue); | |
| 116 | |
| 117 ngx_queue_init(&r->name_expire_queue); | |
| 118 ngx_queue_init(&r->addr_expire_queue); | |
| 1649 | 119 |
| 120 r->event->handler = ngx_resolver_resend_handler; | |
| 121 r->event->data = r; | |
| 122 r->event->log = log; | |
| 123 r->ident = -1; | |
| 124 | |
| 125 r->resend_timeout = 5; | |
| 126 r->expire = 30; | |
| 127 r->valid = 300; | |
| 128 | |
| 129 r->log = log; | |
| 130 r->log_level = NGX_LOG_ALERT; | |
| 131 | |
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132 if (addr) { |
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133 uc = ngx_calloc(sizeof(ngx_udp_connection_t), log); |
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134 if (uc == NULL) { |
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135 return NULL; |
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parents:
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136 } |
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parents:
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137 |
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138 r->udp_connection = uc; |
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parents:
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139 |
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140 uc->sockaddr = addr->sockaddr; |
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141 uc->socklen = addr->socklen; |
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142 uc->server = addr->name; |
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143 uc->log = log; |
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parents:
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144 } |
| 1649 | 145 |
| 146 return r; | |
| 147 } | |
| 148 | |
| 149 | |
| 150 ngx_resolver_ctx_t * | |
| 151 ngx_resolve_start(ngx_resolver_t *r, ngx_resolver_ctx_t *temp) | |
| 152 { | |
| 153 in_addr_t addr; | |
| 154 ngx_resolver_ctx_t *ctx; | |
| 155 | |
| 156 if (temp) { | |
| 157 addr = ngx_inet_addr(temp->name.data, temp->name.len); | |
| 158 | |
| 159 if (addr != INADDR_NONE) { | |
| 160 temp->resolver = r; | |
| 161 temp->state = NGX_OK; | |
| 162 temp->naddrs = 1; | |
| 163 temp->addrs = &temp->addr; | |
| 164 temp->addr = addr; | |
| 165 temp->quick = 1; | |
| 166 | |
| 167 return temp; | |
| 168 } | |
| 169 } | |
| 170 | |
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171 if (r->udp_connection == NULL) { |
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172 return NGX_NO_RESOLVER; |
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parents:
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173 } |
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174 |
| 1649 | 175 ctx = ngx_resolver_calloc(r, sizeof(ngx_resolver_ctx_t)); |
| 176 | |
| 177 if (ctx) { | |
| 178 ctx->resolver = r; | |
| 179 } | |
| 180 | |
| 181 return ctx; | |
| 182 } | |
| 183 | |
| 184 | |
| 185 ngx_int_t | |
| 186 ngx_resolve_name(ngx_resolver_ctx_t *ctx) | |
| 187 { | |
| 188 ngx_int_t rc; | |
| 189 ngx_resolver_t *r; | |
| 190 | |
| 191 r = ctx->resolver; | |
| 192 | |
| 193 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 194 "resolve: \"%V\"", &ctx->name); | |
| 195 | |
| 196 if (ctx->quick) { | |
| 197 ctx->handler(ctx); | |
| 198 return NGX_OK; | |
| 199 } | |
| 200 | |
| 201 /* lock name mutex */ | |
| 202 | |
| 203 rc = ngx_resolve_name_locked(r, ctx); | |
| 204 | |
| 205 if (rc == NGX_OK) { | |
| 206 return NGX_OK; | |
| 207 } | |
| 208 | |
| 209 /* unlock name mutex */ | |
| 210 | |
| 211 if (rc == NGX_AGAIN) { | |
| 212 return NGX_OK; | |
| 213 } | |
| 214 | |
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215 /* NGX_ERROR */ |
| 1649 | 216 |
| 217 if (ctx->event) { | |
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218 ngx_resolver_free(r, ctx->event); |
| 1649 | 219 } |
| 220 | |
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parents:
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diff
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221 ngx_resolver_free(r, ctx); |
| 1649 | 222 |
| 223 return NGX_ERROR; | |
| 224 } | |
| 225 | |
| 226 | |
| 227 void | |
| 228 ngx_resolve_name_done(ngx_resolver_ctx_t *ctx) | |
| 229 { | |
| 230 uint32_t hash; | |
| 231 ngx_resolver_t *r; | |
| 232 ngx_resolver_ctx_t *w, **p; | |
| 233 ngx_resolver_node_t *rn; | |
| 234 | |
| 235 r = ctx->resolver; | |
| 236 | |
| 237 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 238 "resolve name done: %i", ctx->state); | |
| 239 | |
| 240 if (ctx->quick) { | |
| 241 return; | |
| 242 } | |
| 243 | |
| 244 if (ctx->event && ctx->event->timer_set) { | |
| 245 ngx_del_timer(ctx->event); | |
| 246 } | |
| 247 | |
| 248 /* lock name mutex */ | |
| 249 | |
| 250 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
| 251 | |
| 252 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
| 253 | |
| 254 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
| 255 | |
| 256 if (rn) { | |
| 257 p = &rn->waiting; | |
| 258 w = rn->waiting; | |
| 259 | |
| 260 while (w) { | |
| 261 if (w == ctx) { | |
| 262 *p = w->next; | |
| 263 | |
| 264 goto done; | |
| 265 } | |
| 266 | |
| 267 p = &w->next; | |
| 268 w = w->next; | |
| 269 } | |
| 270 } | |
| 271 | |
| 272 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
| 273 "could not cancel %V resolving", &ctx->name); | |
| 274 } | |
| 275 | |
| 276 done: | |
| 277 | |
| 278 ngx_resolver_expire(r, &r->name_rbtree, &r->name_expire_queue); | |
| 279 | |
| 280 /* unlock name mutex */ | |
| 281 | |
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parents:
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282 /* lock alloc mutex */ |
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parents:
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diff
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283 |
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parents:
1903
diff
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284 if (ctx->event) { |
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538f06aa8118
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parents:
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285 ngx_resolver_free_locked(r, ctx->event); |
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538f06aa8118
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parents:
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diff
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286 } |
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538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
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parents:
1903
diff
changeset
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287 |
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538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
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288 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
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289 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
290 /* unlock alloc mutex */ |
| 1649 | 291 } |
| 292 | |
| 293 | |
| 294 /* NGX_RESOLVE_A only */ | |
| 295 | |
| 296 static ngx_int_t | |
| 297 ngx_resolve_name_locked(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx) | |
| 298 { | |
| 299 uint32_t hash; | |
| 300 in_addr_t addr, *addrs; | |
| 301 ngx_uint_t naddrs; | |
| 302 ngx_resolver_ctx_t *next; | |
| 303 ngx_resolver_node_t *rn; | |
| 304 | |
| 305 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
| 306 | |
| 307 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
| 308 | |
| 309 if (rn) { | |
| 310 | |
| 311 if (rn->valid >= ngx_time()) { | |
| 312 | |
| 313 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
| 314 | |
| 315 ngx_queue_remove(&rn->queue); | |
| 316 | |
| 317 rn->expire = ngx_time() + r->expire; | |
| 318 | |
| 319 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 320 | |
| 321 naddrs = rn->naddrs; | |
| 322 | |
| 323 if (naddrs) { | |
| 324 | |
| 325 /* NGX_RESOLVE_A answer */ | |
| 326 | |
| 327 if (naddrs != 1) { | |
| 328 addr = 0; | |
| 329 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
| 330 naddrs * sizeof(in_addr_t)); | |
| 331 if (addrs == NULL) { | |
| 332 return NGX_ERROR; | |
| 333 } | |
| 334 | |
| 335 } else { | |
| 336 addr = rn->u.addr; | |
| 337 addrs = NULL; | |
| 338 } | |
| 339 | |
| 340 ctx->next = rn->waiting; | |
| 341 rn->waiting = NULL; | |
| 342 | |
| 343 /* unlock name mutex */ | |
| 344 | |
| 345 do { | |
| 346 ctx->state = NGX_OK; | |
| 347 ctx->naddrs = naddrs; | |
| 348 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 349 ctx->addr = addr; | |
| 350 next = ctx->next; | |
| 351 | |
| 352 ctx->handler(ctx); | |
| 353 | |
| 354 ctx = next; | |
| 355 } while (ctx); | |
| 356 | |
| 357 if (addrs) { | |
| 358 ngx_resolver_free(r, addrs); | |
| 359 } | |
| 360 | |
| 361 return NGX_OK; | |
| 362 } | |
| 363 | |
| 364 /* NGX_RESOLVE_CNAME */ | |
| 365 | |
| 366 ctx->name.len = rn->cnlen; | |
| 367 ctx->name.data = rn->u.cname; | |
| 368 | |
| 369 return ngx_resolve_name_locked(r, ctx); | |
| 370 } | |
| 371 | |
| 372 if (rn->waiting) { | |
| 373 | |
| 374 ctx->next = rn->waiting; | |
| 375 rn->waiting = ctx; | |
| 376 | |
| 377 return NGX_AGAIN; | |
| 378 } | |
| 379 | |
| 380 ngx_queue_remove(&rn->queue); | |
| 381 | |
| 382 /* lock alloc mutex */ | |
| 383 | |
| 384 ngx_resolver_free_locked(r, rn->query); | |
| 385 | |
| 386 if (rn->cnlen) { | |
| 387 ngx_resolver_free_locked(r, rn->u.cname); | |
| 388 } | |
| 389 | |
| 390 if (rn->naddrs > 1) { | |
| 391 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 392 } | |
| 393 | |
| 394 /* unlock alloc mutex */ | |
| 395 | |
| 396 } else { | |
| 397 | |
| 398 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
| 399 if (rn == NULL) { | |
| 400 return NGX_ERROR; | |
| 401 } | |
| 402 | |
| 403 rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len); | |
| 404 if (rn->name == NULL) { | |
| 405 ngx_resolver_free(r, rn); | |
| 406 return NGX_ERROR; | |
| 407 } | |
| 408 | |
| 409 rn->node.key = hash; | |
| 410 rn->nlen = (u_short) ctx->name.len; | |
| 411 | |
| 412 ngx_rbtree_insert(&r->name_rbtree, &rn->node); | |
| 413 } | |
| 414 | |
| 415 if (ngx_resolver_create_name_query(rn, ctx) != NGX_OK) { | |
| 416 goto failed; | |
| 417 } | |
| 418 | |
| 419 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
| 420 goto failed; | |
| 421 } | |
| 422 | |
| 423 if (ctx->event == NULL) { | |
| 424 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
| 425 if (ctx->event == NULL) { | |
| 426 goto failed; | |
| 427 } | |
| 428 | |
| 429 ctx->event->handler = ngx_resolver_timeout_handler; | |
| 430 ctx->event->data = ctx; | |
| 431 ctx->event->log = r->log; | |
| 432 ctx->ident = -1; | |
| 433 | |
| 434 ngx_add_timer(ctx->event, ctx->timeout); | |
| 435 } | |
| 436 | |
| 437 if (ngx_queue_empty(&r->name_resend_queue)) { | |
| 438 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
| 439 } | |
| 440 | |
| 441 rn->expire = ngx_time() + r->resend_timeout; | |
| 442 | |
| 443 ngx_queue_insert_head(&r->name_resend_queue, &rn->queue); | |
| 444 | |
| 445 rn->cnlen = 0; | |
| 446 rn->naddrs = 0; | |
| 447 rn->valid = 0; | |
| 448 rn->waiting = ctx; | |
| 449 | |
| 450 ctx->state = NGX_AGAIN; | |
| 451 | |
| 452 return NGX_AGAIN; | |
| 453 | |
| 454 failed: | |
| 455 | |
| 456 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 457 | |
| 458 ngx_resolver_free(r, rn->name); | |
| 459 | |
| 460 ngx_resolver_free(r, rn); | |
| 461 | |
| 462 return NGX_ERROR; | |
| 463 } | |
| 583 | 464 |
| 465 | |
| 466 ngx_int_t | |
| 1649 | 467 ngx_resolve_addr(ngx_resolver_ctx_t *ctx) |
| 468 { | |
| 469 ngx_resolver_t *r; | |
| 470 ngx_resolver_node_t *rn; | |
| 471 | |
| 472 r = ctx->resolver; | |
| 473 | |
| 474 ctx->addr = ntohl(ctx->addr); | |
| 475 | |
| 476 /* lock addr mutex */ | |
| 477 | |
| 478 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
| 479 | |
| 480 if (rn) { | |
| 481 | |
| 482 if (rn->valid >= ngx_time()) { | |
| 483 | |
| 484 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
| 485 | |
| 486 ngx_queue_remove(&rn->queue); | |
| 487 | |
| 488 rn->expire = ngx_time() + r->expire; | |
| 489 | |
| 490 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
| 491 | |
| 492 ctx->name.len = rn->nlen; | |
| 493 ctx->name.data = ngx_resolver_dup(r, rn->name, rn->nlen); | |
| 494 if (ctx->name.data == NULL) { | |
| 495 goto failed; | |
| 496 } | |
| 497 | |
| 498 /* unlock addr mutex */ | |
| 499 | |
| 500 ctx->state = NGX_OK; | |
| 501 | |
| 502 ctx->handler(ctx); | |
| 503 | |
| 504 ngx_resolver_free(r, ctx->name.data); | |
| 505 | |
| 506 return NGX_OK; | |
| 507 } | |
| 508 | |
| 509 if (rn->waiting) { | |
| 510 | |
| 511 ctx->next = rn->waiting; | |
| 512 rn->waiting = ctx; | |
| 513 | |
| 514 return NGX_AGAIN; | |
| 515 } | |
| 516 | |
| 517 ngx_queue_remove(&rn->queue); | |
| 518 | |
| 519 ngx_resolver_free(r, rn->query); | |
| 520 | |
| 521 } else { | |
| 522 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
| 523 if (rn == NULL) { | |
| 524 goto failed; | |
| 525 } | |
| 526 | |
| 527 rn->node.key = ctx->addr; | |
| 528 | |
| 529 ngx_rbtree_insert(&r->addr_rbtree, &rn->node); | |
| 530 } | |
| 531 | |
| 532 if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) { | |
| 533 goto failed; | |
| 534 } | |
| 535 | |
| 536 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
| 537 goto failed; | |
| 538 } | |
| 539 | |
| 540 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
| 541 if (ctx->event == NULL) { | |
| 542 goto failed; | |
| 543 } | |
| 544 | |
| 545 ctx->event->handler = ngx_resolver_timeout_handler; | |
| 546 ctx->event->data = ctx; | |
| 547 ctx->event->log = r->log; | |
| 548 ctx->ident = -1; | |
| 549 | |
| 550 ngx_add_timer(ctx->event, ctx->timeout); | |
| 551 | |
| 552 if (ngx_queue_empty(&r->addr_resend_queue)) { | |
| 553 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
| 554 } | |
| 555 | |
| 556 rn->expire = ngx_time() + r->resend_timeout; | |
| 557 | |
| 558 ngx_queue_insert_head(&r->addr_resend_queue, &rn->queue); | |
| 559 | |
| 560 rn->cnlen = 0; | |
| 561 rn->naddrs = 0; | |
| 562 rn->name = NULL; | |
| 563 rn->nlen = 0; | |
| 564 rn->valid = 0; | |
| 565 rn->waiting = ctx; | |
| 566 | |
| 567 /* unlock addr mutex */ | |
| 568 | |
| 569 ctx->state = NGX_AGAIN; | |
| 570 | |
| 571 return NGX_OK; | |
| 572 | |
| 573 failed: | |
| 574 | |
| 575 if (rn) { | |
| 576 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 577 | |
| 578 ngx_resolver_free(r, rn); | |
| 579 } | |
| 580 | |
| 581 /* unlock addr mutex */ | |
| 582 | |
| 583 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
|
584 ngx_resolver_free(r, ctx->event); |
| 1649 | 585 } |
| 586 | |
|
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
587 ngx_resolver_free(r, ctx); |
| 1649 | 588 |
| 589 return NGX_ERROR; | |
| 590 } | |
| 591 | |
| 592 | |
| 593 void | |
| 594 ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx) | |
| 595 { | |
| 596 in_addr_t addr; | |
| 597 ngx_resolver_t *r; | |
| 598 ngx_resolver_ctx_t *w, **p; | |
| 599 ngx_resolver_node_t *rn; | |
| 600 | |
| 601 r = ctx->resolver; | |
| 602 | |
| 603 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 604 "resolve addr done: %i", ctx->state); | |
| 605 | |
| 606 if (ctx->event && ctx->event->timer_set) { | |
| 607 ngx_del_timer(ctx->event); | |
| 608 } | |
| 609 | |
| 610 /* lock addr mutex */ | |
| 611 | |
| 612 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
| 613 | |
| 614 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
| 615 | |
| 616 if (rn) { | |
| 617 p = &rn->waiting; | |
| 618 w = rn->waiting; | |
| 619 | |
| 620 while (w) { | |
| 621 if (w == ctx) { | |
| 622 *p = w->next; | |
| 623 | |
| 624 goto done; | |
| 625 } | |
| 626 | |
| 627 p = &w->next; | |
| 628 w = w->next; | |
| 629 } | |
| 630 } | |
| 631 | |
| 632 addr = ntohl(ctx->addr); | |
| 633 | |
| 634 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
| 635 "could not cancel %ud.%ud.%ud.%ud resolving", | |
| 636 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 637 (addr >> 8) & 0xff, addr & 0xff); | |
| 638 } | |
| 639 | |
| 640 done: | |
| 641 | |
| 642 ngx_resolver_expire(r, &r->addr_rbtree, &r->addr_expire_queue); | |
| 643 | |
| 644 /* unlock addr mutex */ | |
| 645 | |
|
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
646 /* 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
|
647 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
648 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
|
649 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
|
650 } |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
651 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
652 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
|
653 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
654 /* unlock alloc mutex */ |
| 1649 | 655 } |
| 656 | |
| 657 | |
| 658 static void | |
| 659 ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 660 { | |
| 661 time_t now; | |
| 662 ngx_uint_t i; | |
| 663 ngx_queue_t *q; | |
| 664 ngx_resolver_node_t *rn; | |
| 665 | |
| 666 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire"); | |
| 667 | |
| 668 now = ngx_time(); | |
| 669 | |
| 670 for (i = 0; i < 2; i++) { | |
| 671 if (ngx_queue_empty(queue)) { | |
| 672 return; | |
| 673 } | |
| 674 | |
| 675 q = ngx_queue_last(queue); | |
| 676 | |
| 677 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 678 | |
| 679 if (now <= rn->expire) { | |
| 680 return; | |
| 681 } | |
| 682 | |
| 1774 | 683 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, |
| 684 "resolver expire \"%*s\"", (size_t) rn->nlen, rn->name); | |
| 1649 | 685 |
| 686 ngx_queue_remove(q); | |
| 687 | |
| 688 ngx_rbtree_delete(tree, &rn->node); | |
| 689 | |
| 690 ngx_resolver_free_node(r, rn); | |
| 691 } | |
| 692 } | |
| 693 | |
| 694 | |
| 695 static ngx_int_t | |
| 696 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 697 { | |
| 698 ssize_t n; | |
| 699 ngx_udp_connection_t *uc; | |
| 700 | |
| 701 uc = r->udp_connection; | |
| 702 | |
| 703 if (uc->connection == NULL) { | |
| 704 if (ngx_udp_connect(uc) != NGX_OK) { | |
| 705 return NGX_ERROR; | |
| 706 } | |
| 707 | |
| 708 uc->connection->data = r; | |
| 709 uc->connection->read->handler = ngx_resolver_read_response; | |
| 710 } | |
| 711 | |
| 712 n = ngx_send(uc->connection, rn->query, rn->qlen); | |
| 713 | |
| 714 if (n == -1) { | |
| 715 return NGX_ERROR; | |
| 716 } | |
| 717 | |
| 718 if ((size_t) n != (size_t) rn->qlen) { | |
| 719 ngx_log_error(NGX_LOG_CRIT, uc->log, 0, "send() incomplete"); | |
| 720 return NGX_ERROR; | |
| 721 } | |
| 722 | |
| 723 return NGX_OK; | |
| 724 } | |
| 725 | |
| 726 | |
| 727 static void | |
| 728 ngx_resolver_resend_handler(ngx_event_t *ev) | |
| 729 { | |
| 730 time_t timer, atimer, ntimer; | |
| 731 ngx_resolver_t *r; | |
| 732 | |
| 733 r = ev->data; | |
| 734 | |
| 735 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 736 "resolver resend handler"); | |
| 737 | |
| 738 /* lock name mutex */ | |
| 739 | |
| 740 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue); | |
| 741 | |
| 742 /* unlock name mutex */ | |
| 743 | |
| 744 /* lock addr mutex */ | |
| 745 | |
| 746 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
|
747 |
| 1649 | 748 /* unlock addr mutex */ |
| 749 | |
| 750 if (ntimer == 0) { | |
| 751 timer = atimer; | |
| 752 | |
| 753 } else if (atimer == 0) { | |
| 754 timer = ntimer; | |
| 755 | |
| 756 } else { | |
| 757 timer = (atimer < ntimer) ? atimer : ntimer; | |
| 758 } | |
| 759 | |
| 760 if (timer) { | |
| 761 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000)); | |
| 762 } | |
| 763 } | |
| 764 | |
| 765 | |
| 766 static time_t | |
| 767 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 768 { | |
| 769 time_t now; | |
| 770 ngx_queue_t *q; | |
| 771 ngx_resolver_node_t *rn; | |
| 772 | |
| 773 now = ngx_time(); | |
| 774 | |
| 775 for ( ;; ) { | |
| 776 if (ngx_queue_empty(queue)) { | |
| 777 return 0; | |
| 778 } | |
| 779 | |
| 780 q = ngx_queue_last(queue); | |
| 781 | |
| 782 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 783 | |
| 784 if (now < rn->expire) { | |
| 785 return rn->expire - now; | |
| 786 } | |
| 787 | |
| 1774 | 788 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, |
| 789 "resolver resend \"%*s\" %p", | |
| 790 (size_t) rn->nlen, rn->name, rn->waiting); | |
| 1649 | 791 |
| 792 ngx_queue_remove(q); | |
| 793 | |
| 794 if (rn->waiting) { | |
| 795 | |
| 796 if (ngx_resolver_send_query(r, rn) == NGX_OK) { | |
| 797 | |
| 798 rn->expire = now + r->resend_timeout; | |
| 799 | |
| 800 ngx_queue_insert_head(queue, &rn->queue); | |
| 801 } | |
|
1879
cf4ee321d195
do not delete failed DNS request if there are waiting clients
Igor Sysoev <igor@sysoev.ru>
parents:
1878
diff
changeset
|
802 |
|
cf4ee321d195
do not delete failed DNS request if there are waiting clients
Igor Sysoev <igor@sysoev.ru>
parents:
1878
diff
changeset
|
803 continue; |
| 1649 | 804 } |
| 805 | |
| 806 ngx_rbtree_delete(tree, &rn->node); | |
| 807 | |
| 808 ngx_resolver_free_node(r, rn); | |
| 809 } | |
| 810 } | |
| 811 | |
| 812 | |
| 813 static void | |
| 814 ngx_resolver_read_response(ngx_event_t *rev) | |
| 815 { | |
| 816 ssize_t n; | |
| 817 ngx_connection_t *c; | |
| 818 u_char buf[NGX_RESOLVER_UDP_SIZE]; | |
| 819 | |
| 820 c = rev->data; | |
| 821 | |
| 822 do { | |
| 1689 | 823 n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE); |
| 824 | |
| 825 if (n < 0) { | |
| 1649 | 826 return; |
| 827 } | |
| 828 | |
| 829 ngx_resolver_process_response(c->data, buf, n); | |
| 830 | |
| 831 } while (rev->ready); | |
| 832 } | |
| 833 | |
| 834 | |
| 835 static void | |
| 836 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n) | |
| 837 { | |
| 838 char *err; | |
| 839 size_t len; | |
| 840 ngx_uint_t i, ident, flags, code, nqs, nan, qtype, qclass; | |
| 841 ngx_resolver_qs_t *qs; | |
| 842 ngx_resolver_query_t *query; | |
| 843 | |
| 844 if ((size_t) n < sizeof(ngx_resolver_query_t) + 1) { | |
| 845 goto short_response; | |
| 846 } | |
| 847 | |
| 848 query = (ngx_resolver_query_t *) buf; | |
| 849 | |
| 850 ident = (query->ident_hi << 8) + query->ident_lo; | |
| 851 flags = (query->flags_hi << 8) + query->flags_lo; | |
| 852 nqs = (query->nqs_hi << 8) + query->nqs_lo; | |
| 853 nan = (query->nan_hi << 8) + query->nan_lo; | |
| 854 | |
| 855 ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 856 "resolver DNS response %d fl:%04Xud %d/%d/%d/%d", | |
| 857 ident, flags, nqs, nan, | |
| 858 (query->nns_hi << 8) + query->nns_lo, | |
| 859 (query->nar_hi << 8) + query->nar_lo); | |
| 860 | |
| 861 if (!(flags & 0x8000)) { | |
| 862 ngx_log_error(r->log_level, r->log, 0, | |
| 863 "invalid DNS response %d fl:%04Xud", ident, flags); | |
| 864 return; | |
| 865 } | |
| 866 | |
| 867 code = flags & 0x7f; | |
| 868 | |
| 869 if (code == NGX_RESOLVE_FORMERR || code > NGX_RESOLVE_REFUSED) { | |
| 870 ngx_log_error(r->log_level, r->log, 0, | |
| 871 "DNS error (%d: %s), query id:%d", | |
| 872 code, ngx_resolver_strerror(code), ident); | |
| 873 return; | |
| 874 } | |
| 875 | |
| 876 if (nqs != 1) { | |
| 877 err = "invalid number of questions in DNS response"; | |
| 878 goto done; | |
| 879 } | |
| 880 | |
| 881 i = sizeof(ngx_resolver_query_t); | |
| 882 | |
| 883 while (i < (ngx_uint_t) n) { | |
| 884 if (buf[i] == '\0') { | |
| 885 goto found; | |
| 886 } | |
| 887 | |
| 888 len = buf[i]; | |
| 889 i += 1 + len; | |
| 890 } | |
| 891 | |
| 892 goto short_response; | |
| 893 | |
| 894 found: | |
| 895 | |
| 896 if (i++ == 0) { | |
| 897 err = "zero-length domain name in DNS response"; | |
| 898 goto done; | |
| 899 } | |
| 900 | |
| 901 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t)) | |
| 902 > (ngx_uint_t) n) | |
| 903 { | |
| 904 goto short_response; | |
| 905 } | |
| 906 | |
| 907 qs = (ngx_resolver_qs_t *) &buf[i]; | |
| 908 | |
| 909 qtype = (qs->type_hi << 8) + qs->type_lo; | |
| 910 qclass = (qs->class_hi << 8) + qs->class_lo; | |
| 911 | |
| 912 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 913 "resolver DNS response qt:%d cl:%d", qtype, qclass); | |
| 914 | |
| 915 if (qclass != 1) { | |
| 916 ngx_log_error(r->log_level, r->log, 0, | |
| 917 "unknown query class %d in DNS response", qclass); | |
| 918 return; | |
| 919 } | |
| 920 | |
| 921 switch (qtype) { | |
| 922 | |
| 923 case NGX_RESOLVE_A: | |
| 924 | |
| 925 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
|
926 i + sizeof(ngx_resolver_qs_t)); |
| 1649 | 927 |
| 928 break; | |
| 929 | |
| 930 case NGX_RESOLVE_PTR: | |
| 931 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
932 ngx_resolver_process_ptr(r, buf, n, ident, code, nan); |
| 1649 | 933 |
| 934 break; | |
| 935 | |
| 936 default: | |
| 937 ngx_log_error(r->log_level, r->log, 0, | |
| 938 "unknown query type %d in DNS response", qtype); | |
| 939 return; | |
| 940 } | |
| 941 | |
| 942 return; | |
| 943 | |
| 944 short_response: | |
| 945 | |
| 946 err = "short dns response"; | |
| 947 | |
| 948 done: | |
| 949 | |
| 950 ngx_log_error(r->log_level, r->log, 0, err); | |
| 951 | |
| 952 return; | |
| 953 } | |
| 954 | |
| 955 | |
| 956 static void | |
| 957 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last, | |
| 958 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans) | |
| 583 | 959 { |
| 1649 | 960 char *err; |
| 961 u_char *cname; | |
| 962 size_t len; | |
| 963 uint32_t hash; | |
| 964 in_addr_t addr, *addrs; | |
| 965 ngx_str_t name; | |
| 966 ngx_uint_t qtype, qident, naddrs, a, i, n, start; | |
| 967 ngx_resolver_an_t *an; | |
| 968 ngx_resolver_ctx_t *ctx, *next; | |
| 969 ngx_resolver_node_t *rn; | |
| 970 | |
| 971 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) { | |
| 972 return; | |
| 973 } | |
| 974 | |
| 975 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); | |
| 976 | |
| 977 hash = ngx_crc32_short(name.data, name.len); | |
| 978 | |
| 979 /* lock name mutex */ | |
| 980 | |
| 981 rn = ngx_resolver_lookup_name(r, &name, hash); | |
| 982 | |
| 983 if (rn == NULL || rn->query == NULL) { | |
| 984 ngx_log_error(r->log_level, r->log, 0, | |
| 985 "unexpected response for %V", &name); | |
| 986 goto failed; | |
| 987 } | |
| 988 | |
| 989 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 990 | |
| 991 if (ident != qident) { | |
| 992 ngx_log_error(r->log_level, r->log, 0, | |
| 993 "wrong ident %d response for %V, expect %d", | |
| 994 ident, &name, qident); | |
| 995 goto failed; | |
| 996 } | |
| 997 | |
|
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parents:
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diff
changeset
|
998 if (code == 0 && nan == 0) { |
|
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diff
changeset
|
999 code = 3; /* NXDOMAIN */ |
|
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parents:
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changeset
|
1000 } |
|
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parents:
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|
1001 |
| 1649 | 1002 if (code) { |
| 1003 next = rn->waiting; | |
| 1004 rn->waiting = NULL; | |
| 1005 | |
| 1006 ngx_queue_remove(&rn->queue); | |
| 1007 | |
| 1008 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 1009 | |
| 1010 ngx_resolver_free_node(r, rn); | |
| 1011 | |
| 1012 /* unlock name mutex */ | |
| 1013 | |
| 1014 while (next) { | |
| 1015 ctx = next; | |
| 1016 ctx->state = code; | |
| 1017 next = ctx->next; | |
| 1018 | |
| 1019 ctx->handler(ctx); | |
| 1020 } | |
| 1021 | |
| 1022 return; | |
| 1023 } | |
| 1024 | |
| 1025 i = ans; | |
| 1026 naddrs = 0; | |
| 1027 addr = 0; | |
| 1028 addrs = NULL; | |
| 1029 cname = NULL; | |
| 1030 qtype = 0; | |
| 1031 | |
| 1032 for (a = 0; a < nan; a++) { | |
| 1033 | |
| 1034 start = i; | |
| 1035 | |
| 1036 while (i < last) { | |
| 1037 | |
| 1038 if (buf[i] & 0xc0) { | |
| 1039 i += 2; | |
| 1040 goto found; | |
| 1041 } | |
| 1042 | |
| 1043 if (buf[i] == 0) { | |
| 1044 i++; | |
| 1045 goto test_length; | |
| 1046 } | |
| 1047 | |
| 1048 i += 1 + buf[i]; | |
| 1049 } | |
| 1050 | |
| 1051 goto short_response; | |
| 1052 | |
| 1053 test_length: | |
| 1054 | |
| 1055 if (i - start < 2) { | |
| 1056 err = "invalid name in dns response"; | |
| 1057 goto invalid; | |
| 1058 } | |
| 1059 | |
| 1060 found: | |
| 1061 | |
| 1062 if (i + sizeof(ngx_resolver_an_t) >= last) { | |
| 1063 goto short_response; | |
| 1064 } | |
| 1065 | |
| 1066 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1067 | |
| 1068 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1069 len = (an->len_hi << 8) + an->len_lo; | |
| 1070 | |
| 1071 if (qtype == NGX_RESOLVE_A) { | |
| 1072 | |
| 1073 i += sizeof(ngx_resolver_an_t); | |
| 1074 | |
| 1075 if (i + len > last) { | |
| 1076 goto short_response; | |
| 1077 } | |
| 1078 | |
| 1079 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1080 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1081 | |
| 1082 naddrs++; | |
| 1083 | |
| 1084 i += len; | |
| 1085 | |
| 1086 } else if (qtype == NGX_RESOLVE_CNAME) { | |
| 1087 cname = &buf[i] + sizeof(ngx_resolver_an_t); | |
| 1088 i += sizeof(ngx_resolver_an_t) + len; | |
| 1089 } | |
| 1090 } | |
| 1091 | |
| 1092 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1093 "resolver naddrs:%ui cname:%p", naddrs, cname); | |
| 1094 | |
| 1095 if (naddrs) { | |
| 1096 | |
| 1097 if (naddrs == 1) { | |
| 1098 rn->u.addr = addr; | |
| 1099 | |
| 1100 } else { | |
| 1101 | |
| 1102 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t)); | |
| 1103 if (addrs == NULL) { | |
| 1104 return; | |
| 1105 } | |
| 1106 | |
| 1107 n = 0; | |
| 1108 i = ans; | |
| 1109 | |
| 1110 for (a = 0; a < nan; a++) { | |
| 1111 | |
| 1112 for ( ;; ) { | |
| 1113 | |
| 1114 if (buf[i] & 0xc0) { | |
| 1115 i += 2; | |
| 1116 goto ok; | |
| 1117 } | |
| 1118 | |
| 1119 if (buf[i] == 0) { | |
| 1120 i++; | |
| 1121 goto ok; | |
| 1122 } | |
| 1123 | |
| 1124 i += 1 + buf[i]; | |
| 1125 } | |
| 1126 | |
| 1127 ok: | |
| 1128 | |
| 1129 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1130 | |
| 1131 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1132 len = (an->len_hi << 8) + an->len_lo; | |
| 1133 | |
| 1134 i += sizeof(ngx_resolver_an_t); | |
| 1135 | |
| 1136 if (qtype == NGX_RESOLVE_A) { | |
| 1137 | |
| 1138 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1139 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1140 | |
| 1141 if (n == naddrs) { | |
| 1142 break; | |
| 1143 } | |
| 1144 } | |
| 1145 | |
| 1146 i += len; | |
| 1147 } | |
| 1148 | |
| 1149 rn->u.addrs = addrs; | |
| 1150 | |
| 1151 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
| 1152 naddrs * sizeof(in_addr_t)); | |
| 1153 if (addrs == NULL) { | |
| 1154 return; | |
| 1155 } | |
| 1156 } | |
| 1157 | |
| 1158 rn->naddrs = (u_short) naddrs; | |
| 1159 | |
| 1160 ngx_queue_remove(&rn->queue); | |
| 1161 | |
| 1162 rn->valid = ngx_time() + r->valid; | |
| 1163 rn->expire = ngx_time() + r->expire; | |
| 1164 | |
| 1165 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1166 | |
| 1167 next = rn->waiting; | |
| 1168 rn->waiting = NULL; | |
| 1169 | |
| 1170 /* unlock name mutex */ | |
| 1171 | |
| 1172 while (next) { | |
| 1173 ctx = next; | |
| 1174 ctx->state = NGX_OK; | |
| 1175 ctx->naddrs = naddrs; | |
| 1176 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 1177 ctx->addr = addr; | |
| 1178 next = ctx->next; | |
| 1179 | |
| 1180 ctx->handler(ctx); | |
| 1181 } | |
| 1182 | |
| 1183 if (naddrs) { | |
| 1184 ngx_resolver_free(r, addrs); | |
| 1185 } | |
| 1186 | |
| 1187 return; | |
| 1188 | |
| 1189 } else if (cname) { | |
| 1190 | |
| 1191 /* CNAME only */ | |
| 1192 | |
| 1193 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) { | |
| 1194 return; | |
| 1195 } | |
| 1196 | |
| 1197 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1198 "resolver cname:\"%V\"", &name); | |
| 1199 | |
|
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parents:
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diff
changeset
|
1200 ngx_queue_remove(&rn->queue); |
|
0829024c924d
fix segfault if response will have CNAME only
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parents:
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diff
changeset
|
1201 |
| 1649 | 1202 rn->cnlen = (u_short) name.len; |
| 1203 rn->u.cname = name.data; | |
| 1204 rn->valid = ngx_time() + r->valid; | |
| 1205 rn->expire = ngx_time() + r->expire; | |
| 1206 | |
| 1207 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1208 | |
| 1209 ctx = rn->waiting; | |
| 1210 rn->waiting = NULL; | |
| 1211 | |
| 1212 if (ctx) { | |
| 1213 ctx->name = name; | |
| 1214 | |
| 1215 (void) ngx_resolve_name_locked(r, ctx); | |
| 1216 } | |
| 1217 | |
| 1218 return; | |
| 1219 } | |
| 1220 | |
| 1221 ngx_log_error(r->log_level, r->log, 0, | |
| 1222 "no A or CNAME types in DNS responses, unknown query type: %d", | |
| 1223 qtype); | |
| 1224 return; | |
| 1225 | |
| 1226 short_response: | |
| 1227 | |
| 1228 err = "short dns response"; | |
| 1229 | |
| 1230 invalid: | |
| 1231 | |
| 1232 /* unlock name mutex */ | |
| 1233 | |
| 1234 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1235 | |
| 1236 return; | |
| 1237 | |
| 1238 failed: | |
| 1239 | |
| 1240 /* unlock name mutex */ | |
| 1241 | |
| 1242 return; | |
| 1243 } | |
| 1244 | |
| 1245 | |
| 1246 static void | |
| 1247 ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, | |
|
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268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1248 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan) |
| 1649 | 1249 { |
| 1250 char *err; | |
| 1251 size_t len; | |
| 1252 in_addr_t addr; | |
| 1253 ngx_int_t digit; | |
| 1254 ngx_str_t name; | |
| 1255 ngx_uint_t i, mask, qtype, qclass, qident; | |
| 1256 ngx_resolver_an_t *an; | |
| 1257 ngx_resolver_ctx_t *ctx, *next; | |
| 1258 ngx_resolver_node_t *rn; | |
| 1259 | |
| 1260 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) { | |
| 1261 goto invalid_in_addr_arpa; | |
| 1262 } | |
| 1263 | |
| 1264 addr = 0; | |
| 1265 i = 12; | |
| 1266 | |
| 1267 for (mask = 0; mask < 32; mask += 8) { | |
| 1268 len = buf[i++]; | |
| 1269 | |
| 1270 digit = ngx_atoi(&buf[i], len); | |
| 1271 if (digit == NGX_ERROR || digit > 255) { | |
| 1272 goto invalid_in_addr_arpa; | |
| 1273 } | |
| 1274 | |
| 1275 addr += digit << mask; | |
| 1276 i += len; | |
| 1277 } | |
| 1278 | |
| 1279 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) { | |
| 1280 goto invalid_in_addr_arpa; | |
| 1281 } | |
| 1282 | |
| 1283 /* lock addr mutex */ | |
| 1284 | |
| 1285 rn = ngx_resolver_lookup_addr(r, addr); | |
| 1286 | |
| 1287 if (rn == NULL || rn->query == NULL) { | |
| 1288 ngx_log_error(r->log_level, r->log, 0, | |
| 1289 "unexpected response for %ud.%ud.%ud.%ud", | |
| 1290 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 1291 (addr >> 8) & 0xff, addr & 0xff); | |
| 1292 goto failed; | |
| 1293 } | |
| 1294 | |
| 1295 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 1296 | |
| 1297 if (ident != qident) { | |
| 1298 ngx_log_error(r->log_level, r->log, 0, | |
| 1299 "wrong ident %d response for %ud.%ud.%ud.%ud, expect %d", | |
| 1300 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 1301 (addr >> 8) & 0xff, addr & 0xff, qident); | |
| 1302 goto failed; | |
| 1303 } | |
| 1304 | |
|
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268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1305 if (code == 0 && nan == 0) { |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1306 code = 3; /* NXDOMAIN */ |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1307 } |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1308 |
| 1649 | 1309 if (code) { |
| 1310 next = rn->waiting; | |
| 1311 rn->waiting = NULL; | |
| 1312 | |
| 1313 ngx_queue_remove(&rn->queue); | |
| 1314 | |
| 1315 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 1316 | |
| 1317 ngx_resolver_free_node(r, rn); | |
| 1318 | |
| 1319 /* unlock addr mutex */ | |
| 1320 | |
| 1321 while (next) { | |
| 1322 ctx = next; | |
| 1323 ctx->state = code; | |
| 1324 next = ctx->next; | |
| 1325 | |
| 1326 ctx->handler(ctx); | |
| 1327 } | |
| 1328 | |
| 1329 return; | |
| 1330 } | |
| 1331 | |
| 1332 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t); | |
| 1333 | |
| 1334 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) { | |
| 1335 goto short_response; | |
| 1336 } | |
| 1337 | |
| 1338 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */ | |
| 1339 | |
| 1340 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) { | |
| 1341 err = "invalid in-addr.arpa name in DNS response"; | |
| 1342 goto invalid; | |
| 1343 } | |
| 1344 | |
| 1345 an = (ngx_resolver_an_t *) &buf[i + 2]; | |
| 1346 | |
| 1347 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1348 qclass = (an->class_hi << 8) + an->class_lo; | |
| 1349 len = (an->len_hi << 8) + an->len_lo; | |
| 1350 | |
| 1351 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1352 "resolver qt:%d cl:%d len:%uz", qtype, qclass, len); | |
| 1353 | |
| 1354 i += 2 + sizeof(ngx_resolver_an_t); | |
| 1355 | |
| 1356 if (i + len > (ngx_uint_t) n) { | |
| 1357 goto short_response; | |
| 1358 } | |
| 1359 | |
| 1360 len -= 2; | |
| 1361 | |
| 1362 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) { | |
| 1363 return; | |
| 1364 } | |
| 1365 | |
| 1366 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name); | |
| 1367 | |
| 1368 if (len != (size_t) rn->nlen || ngx_strncmp(name.data, rn->name, len) != 0) | |
| 1369 { | |
| 1370 ngx_resolver_free(r, rn->name); | |
| 1371 rn->name = name.data; | |
| 1372 | |
| 1373 name.data = ngx_resolver_dup(r, rn->name, len); | |
| 1374 if (name.data == NULL) { | |
| 1375 goto failed; | |
| 1376 } | |
| 1377 } | |
| 1378 | |
| 1379 ngx_queue_remove(&rn->queue); | |
| 1380 | |
| 1381 rn->valid = ngx_time() + r->valid; | |
| 1382 rn->expire = ngx_time() + r->expire; | |
| 1383 | |
| 1384 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
| 1385 | |
| 1386 next = rn->waiting; | |
| 1387 rn->waiting = NULL; | |
| 1388 | |
| 1389 /* unlock addr mutex */ | |
| 1390 | |
| 1391 while (next) { | |
| 1392 ctx = next; | |
| 1393 ctx->state = NGX_OK; | |
| 1394 ctx->name = name; | |
| 1395 next = ctx->next; | |
| 1396 | |
| 1397 ctx->handler(ctx); | |
| 1398 } | |
| 1399 | |
| 1400 ngx_resolver_free(r, name.data); | |
| 1401 | |
| 1402 return; | |
| 1403 | |
| 1404 invalid_in_addr_arpa: | |
| 1405 | |
| 1406 ngx_log_error(r->log_level, r->log, 0, | |
| 1407 "invalid in-addr.arpa name in DNS response"); | |
| 1408 return; | |
| 1409 | |
| 1410 short_response: | |
| 1411 | |
| 1412 err = "short DNS response"; | |
| 1413 | |
| 1414 invalid: | |
| 1415 | |
| 1416 /* unlock addr mutex */ | |
| 1417 | |
| 1418 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1419 | |
| 1420 return; | |
| 1421 | |
| 1422 failed: | |
| 1423 | |
| 1424 /* unlock addr mutex */ | |
| 1425 | |
| 1426 return; | |
| 1427 } | |
| 1428 | |
| 1429 | |
| 1430 static ngx_resolver_node_t * | |
| 1431 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) | |
| 1432 { | |
| 1433 ngx_int_t rc; | |
| 1434 size_t len; | |
| 1435 ngx_rbtree_node_t *node, *sentinel; | |
| 1436 ngx_resolver_node_t *rn; | |
| 1437 | |
| 1438 node = r->name_rbtree.root; | |
| 1439 sentinel = r->name_rbtree.sentinel; | |
| 1440 | |
| 1441 while (node != sentinel) { | |
| 1442 | |
| 1443 if (hash < node->key) { | |
| 1444 node = node->left; | |
| 1445 continue; | |
| 1446 } | |
| 1447 | |
| 1448 if (hash > node->key) { | |
| 1449 node = node->right; | |
| 1450 continue; | |
| 1451 } | |
| 1452 | |
| 1453 /* hash == node->key */ | |
| 1454 | |
| 1455 do { | |
| 1456 rn = (ngx_resolver_node_t *) node; | |
| 1457 | |
| 1458 len = (name->len > (size_t) rn->nlen) ? rn->nlen : name->len; | |
| 1459 | |
| 1460 rc = ngx_strncmp(name->data, rn->name, len); | |
| 1461 | |
| 1462 if (rc == 0) { | |
| 1463 return rn; | |
| 1464 } | |
| 1465 | |
| 1466 node = (rc < 0) ? node->left : node->right; | |
| 1467 | |
| 1468 } while (node != sentinel && hash == node->key); | |
| 1469 | |
| 1470 break; | |
| 1471 } | |
| 1472 | |
| 1473 /* not found */ | |
| 1474 | |
| 1475 return NULL; | |
| 1476 } | |
| 1477 | |
| 1478 | |
| 1479 static ngx_resolver_node_t * | |
| 1480 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr) | |
| 1481 { | |
| 1482 ngx_rbtree_node_t *node, *sentinel; | |
| 1483 | |
| 1484 node = r->addr_rbtree.root; | |
| 1485 sentinel = r->addr_rbtree.sentinel; | |
| 1486 | |
| 1487 while (node != sentinel) { | |
| 1488 | |
| 1489 if (addr < node->key) { | |
| 1490 node = node->left; | |
| 1491 continue; | |
| 1492 } | |
| 1493 | |
| 1494 if (addr > node->key) { | |
| 1495 node = node->right; | |
| 1496 continue; | |
| 1497 } | |
| 1498 | |
| 1499 /* addr == node->key */ | |
| 1500 | |
| 1501 return (ngx_resolver_node_t *) node; | |
| 1502 } | |
| 1503 | |
| 1504 /* not found */ | |
| 1505 | |
| 1506 return NULL; | |
| 1507 } | |
| 1508 | |
| 1509 | |
| 1510 static void | |
| 1511 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
| 1512 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
| 1513 { | |
| 1514 size_t len; | |
| 1515 ngx_rbtree_node_t **p; | |
| 1516 ngx_resolver_node_t *rn, *rn_temp; | |
| 1517 | |
| 1518 for ( ;; ) { | |
| 1519 | |
| 1520 if (node->key < temp->key) { | |
| 1521 | |
| 1522 p = &temp->left; | |
| 1523 | |
| 1524 } else if (node->key > temp->key) { | |
| 1525 | |
| 1526 p = &temp->right; | |
| 1527 | |
| 1528 } else { /* node->key == temp->key */ | |
| 1529 | |
| 1530 rn = (ngx_resolver_node_t *) node; | |
| 1531 rn_temp = (ngx_resolver_node_t *) temp; | |
| 1532 | |
| 1533 len = (rn->nlen > rn_temp->nlen) ? rn_temp->nlen : rn->nlen; | |
| 1534 | |
| 1535 p = (ngx_strncmp(rn->name, rn_temp->name, len) < 0) | |
| 1536 ? &temp->left : &temp->right; | |
| 1537 } | |
| 1538 | |
| 1539 if (*p == sentinel) { | |
| 1540 break; | |
| 1541 } | |
| 1542 | |
| 1543 temp = *p; | |
| 1544 } | |
| 1545 | |
| 1546 *p = node; | |
| 1547 node->parent = temp; | |
| 1548 node->left = sentinel; | |
| 1549 node->right = sentinel; | |
| 1550 ngx_rbt_red(node); | |
| 1551 } | |
| 1552 | |
| 1553 | |
| 1554 static ngx_int_t | |
| 1555 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1556 { | |
| 1557 u_char *p, *s; | |
| 1558 size_t len; | |
| 1559 ngx_uint_t ident; | |
| 1560 ngx_resolver_qs_t *qs; | |
| 1561 ngx_resolver_query_t *query; | |
| 1562 | |
| 1563 len = sizeof(ngx_resolver_query_t) | |
| 1564 + 1 + ctx->name.len + 1 + sizeof(ngx_resolver_qs_t); | |
| 1565 | |
| 1566 p = ngx_resolver_calloc(ctx->resolver, len); | |
| 1567 if (p == NULL) { | |
| 1568 return NGX_ERROR; | |
| 1569 } | |
| 1570 | |
| 1571 rn->qlen = (u_short) len; | |
| 1572 rn->query = p; | |
| 1573 | |
| 1574 query = (ngx_resolver_query_t *) p; | |
| 1575 | |
| 1576 ident = ngx_random(); | |
| 1577 | |
| 1578 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0, | |
| 1579 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff); | |
| 1580 | |
| 1581 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1582 query->ident_lo = (u_char) (ident & 0xff); | |
| 1583 | |
| 1584 /* recursion query */ | |
| 1585 query->flags_hi = 1; query->flags_lo = 0; | |
| 1586 | |
| 1587 /* one question */ | |
| 1588 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1589 query->nan_hi = 0; query->nan_lo = 0; | |
| 1590 query->nns_hi = 0; query->nns_lo = 0; | |
| 1591 query->nar_hi = 0; query->nar_lo = 0; | |
| 1592 | |
| 1593 p += sizeof(ngx_resolver_query_t) + 1 + ctx->name.len + 1; | |
| 1594 | |
| 1595 qs = (ngx_resolver_qs_t *) p; | |
| 1596 | |
| 1597 /* query type */ | |
| 1598 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type; | |
| 1599 | |
| 1600 /* IP query class */ | |
| 1601 qs->class_hi = 0; qs->class_lo = 1; | |
| 1602 | |
| 1603 /* convert "www.example.com" to "\3www\7example\3com\0" */ | |
| 1604 | |
| 1605 len = 0; | |
| 1606 p--; | |
| 1607 *p-- = '\0'; | |
| 1608 | |
| 1609 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) { | |
| 1610 if (*s != '.') { | |
| 1611 *p = *s; | |
| 1612 len++; | |
| 1613 | |
| 1614 } else { | |
| 1615 *p = (u_char) len; | |
| 1616 len = 0; | |
| 1617 } | |
| 1618 | |
| 1619 p--; | |
| 1620 } | |
| 1621 | |
| 1622 *p = (u_char) len; | |
| 1623 | |
| 1624 return NGX_OK; | |
| 1625 } | |
| 1626 | |
| 1627 | |
| 1628 /* AF_INET only */ | |
| 1629 | |
| 1630 static ngx_int_t | |
| 1631 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1632 { | |
| 1633 u_char *p, *d; | |
| 1634 size_t len; | |
| 1635 ngx_int_t n; | |
| 1636 ngx_uint_t ident; | |
| 1637 ngx_resolver_query_t *query; | |
| 1638 | |
| 1639 len = sizeof(ngx_resolver_query_t) | |
| 1640 + sizeof(".255.255.255.255.in-addr.arpa.") - 1 | |
| 1641 + sizeof(ngx_resolver_qs_t); | |
| 1642 | |
| 1643 p = ngx_resolver_calloc(ctx->resolver, len); | |
| 1644 if (p == NULL) { | |
| 1645 return NGX_ERROR; | |
| 1646 } | |
| 1647 | |
| 1648 rn->query = p; | |
| 1649 query = (ngx_resolver_query_t *) p; | |
| 1650 | |
| 1651 ident = ngx_random(); | |
| 1652 | |
| 1653 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1654 query->ident_lo = (u_char) (ident & 0xff); | |
| 1655 | |
| 1656 /* recursion query */ | |
| 1657 query->flags_hi = 1; query->flags_lo = 0; | |
| 1658 | |
| 1659 /* one question */ | |
| 1660 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1661 query->nan_hi = 0; query->nan_lo = 0; | |
| 1662 query->nns_hi = 0; query->nns_lo = 0; | |
| 1663 query->nar_hi = 0; query->nar_lo = 0; | |
| 1664 | |
| 1665 p += sizeof(ngx_resolver_query_t); | |
| 1666 | |
| 1667 for (n = 0; n < 32; n += 8){ | |
| 1668 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff); | |
| 1669 *p = (u_char) (d - &p[1]); | |
| 1670 p = d; | |
| 1671 } | |
| 1672 | |
| 1673 /* query type "PTR", IP query class */ | |
| 1674 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18); | |
| 1675 | |
| 1676 rn->qlen = (u_short) | |
| 1677 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t) | |
| 1678 - rn->query); | |
| 1679 | |
| 1680 return NGX_OK; | |
| 1681 } | |
| 1682 | |
| 1683 | |
| 1684 static ngx_int_t | |
| 1685 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src, | |
| 1686 u_char *last) | |
| 1687 { | |
| 1688 char *err; | |
| 1689 u_char *p, *dst; | |
| 1690 ssize_t len; | |
| 1691 ngx_uint_t i, n; | |
| 1692 | |
| 1693 p = src; | |
| 1694 len = -1; | |
| 1695 | |
| 1696 /* | |
| 1697 * compression pointers allow to create endless loop, so we set limit; | |
| 1698 * 128 pointers should be enough to store 255-byte name | |
| 1699 */ | |
| 1700 | |
| 1701 for (i = 0; i < 128; i++) { | |
| 1702 n = *p++; | |
| 1703 | |
| 1704 if (n == 0) { | |
| 1705 goto done; | |
| 1706 } | |
| 1707 | |
| 1708 if (n & 0xc0) { | |
| 1709 n = (n & 0x3f << 8) + *p; | |
| 1710 p = &buf[n]; | |
| 1711 | |
| 1712 } else { | |
| 1713 len += 1 + n; | |
| 1714 p = &p[n]; | |
| 1715 } | |
| 1716 | |
| 1717 if (p >= last) { | |
| 1718 err = "name is out of response"; | |
| 1719 goto invalid; | |
| 1720 } | |
| 1721 } | |
| 1722 | |
| 1723 err = "compression pointers loop"; | |
| 1724 | |
| 1725 invalid: | |
| 1726 | |
| 1727 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1728 | |
| 1729 return NGX_ERROR; | |
| 1730 | |
| 1731 done: | |
| 1732 | |
| 1733 if (name == NULL) { | |
| 583 | 1734 return NGX_OK; |
| 1735 } | |
| 1736 | |
| 1649 | 1737 dst = ngx_resolver_alloc(r, len); |
| 1738 if (dst == NULL) { | |
| 1739 return NGX_ERROR; | |
| 1740 } | |
| 1741 | |
| 1742 name->data = dst; | |
| 1743 | |
| 1744 n = *src++; | |
| 1745 | |
| 1746 for ( ;; ) { | |
| 1747 if (n != 0xc0) { | |
| 1748 ngx_memcpy(dst, src, n); | |
| 1749 dst += n; | |
| 1750 src += n; | |
| 1751 | |
| 1752 n = *src++; | |
| 1753 | |
| 1754 if (n != 0) { | |
| 1755 *dst++ = '.'; | |
| 1756 } | |
| 1757 | |
| 1758 } else { | |
| 1759 n = (n & 0x3f << 8) + *src; | |
| 1760 src = &buf[n]; | |
| 1761 | |
| 1762 n = *src++; | |
| 1763 } | |
| 1764 | |
| 1765 if (n == 0) { | |
| 1766 name->len = dst - name->data; | |
| 1767 return NGX_OK; | |
| 1768 } | |
| 1769 } | |
| 1770 } | |
| 1771 | |
| 1772 | |
| 1773 static void | |
| 1774 ngx_resolver_timeout_handler(ngx_event_t *ev) | |
| 1775 { | |
| 1776 ngx_resolver_ctx_t *ctx; | |
| 1777 | |
| 1778 ctx = ev->data; | |
| 1779 | |
| 1780 ctx->state = NGX_RESOLVE_TIMEDOUT; | |
| 1781 | |
| 1782 ctx->handler(ctx); | |
| 1783 } | |
| 1784 | |
| 1785 | |
| 1786 static void | |
| 1787 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 1788 { | |
| 1789 /* lock alloc mutex */ | |
| 1790 | |
| 1791 if (rn->query) { | |
| 1792 ngx_resolver_free_locked(r, rn->query); | |
| 1793 } | |
| 1794 | |
| 1795 if (rn->name) { | |
| 1796 ngx_resolver_free_locked(r, rn->name); | |
| 1797 } | |
| 1798 | |
| 1799 if (rn->cnlen) { | |
| 1800 ngx_resolver_free_locked(r, rn->u.cname); | |
| 1801 } | |
| 1802 | |
| 1803 if (rn->naddrs > 1) { | |
| 1804 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 1805 } | |
| 1806 | |
| 1807 ngx_resolver_free_locked(r, rn); | |
| 1808 | |
| 1809 /* unlock alloc mutex */ | |
| 1810 } | |
| 1811 | |
| 1812 | |
| 1813 static void * | |
| 1814 ngx_resolver_alloc(ngx_resolver_t *r, size_t size) | |
| 1815 { | |
| 1816 u_char *p; | |
| 1817 | |
| 1818 /* lock alloc mutex */ | |
| 1819 | |
| 1820 p = ngx_alloc(size, r->log); | |
| 1821 | |
| 1822 /* unlock alloc mutex */ | |
| 1823 | |
| 1824 return p; | |
| 1825 } | |
| 1826 | |
| 1827 | |
| 1903 | 1828 static void * |
| 1649 | 1829 ngx_resolver_calloc(ngx_resolver_t *r, size_t size) |
| 1830 { | |
| 1831 u_char *p; | |
| 1832 | |
| 1833 p = ngx_resolver_alloc(r, size); | |
| 1834 | |
| 1835 if (p) { | |
| 1836 ngx_memzero(p, size); | |
| 1837 } | |
| 1838 | |
| 1839 return p; | |
| 1840 } | |
| 1841 | |
| 1842 | |
| 1843 static void | |
| 1844 ngx_resolver_free(ngx_resolver_t *r, void *p) | |
| 1845 { | |
| 1846 /* lock alloc mutex */ | |
| 1847 | |
| 1848 ngx_free(p); | |
| 1849 | |
| 1850 /* unlock alloc mutex */ | |
| 1851 } | |
| 1852 | |
| 1853 | |
| 1854 static void | |
| 1855 ngx_resolver_free_locked(ngx_resolver_t *r, void *p) | |
| 1856 { | |
| 1857 ngx_free(p); | |
| 1858 } | |
| 1859 | |
| 1860 | |
| 1861 static void * | |
| 1862 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size) | |
| 1863 { | |
| 1864 void *dst; | |
| 1865 | |
| 1866 dst = ngx_resolver_alloc(r, size); | |
| 1867 | |
| 1868 if (dst == NULL) { | |
| 1869 return dst; | |
| 1870 } | |
| 1871 | |
| 1872 ngx_memcpy(dst, src, size); | |
| 1873 | |
| 1874 return dst; | |
| 1875 } | |
| 1876 | |
| 1877 | |
| 1878 char * | |
| 1879 ngx_resolver_strerror(ngx_int_t err) | |
| 1880 { | |
| 1881 static char *errors[] = { | |
| 1882 "Format error", /* FORMERR */ | |
| 1883 "Server failure", /* SERVFAIL */ | |
| 1884 "Host not found", /* NXDOMAIN */ | |
| 1885 "Unimplemented", /* NOTIMP */ | |
| 1886 "Operation refused" /* REFUSED */ | |
| 1887 }; | |
| 1888 | |
| 1889 if (err > 0 && err < 6) { | |
| 1890 return errors[err - 1]; | |
| 1891 } | |
| 1892 | |
| 1893 if (err == NGX_RESOLVE_TIMEDOUT) { | |
| 1894 return "Operation timed out"; | |
| 1895 } | |
| 1896 | |
| 1897 return "Unknown error"; | |
| 1898 } | |
| 1899 | |
| 1900 | |
| 1901 ngx_int_t | |
| 1902 ngx_udp_connect(ngx_udp_connection_t *uc) | |
| 1903 { | |
| 1904 int rc; | |
| 1905 ngx_int_t event; | |
| 1906 ngx_event_t *rev, *wev; | |
| 1907 ngx_socket_t s; | |
| 1908 ngx_connection_t *c; | |
| 1909 | |
| 583 | 1910 s = ngx_socket(AF_INET, SOCK_DGRAM, 0); |
| 1911 | |
| 1649 | 1912 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, uc->log, 0, "UDP socket %d", s); |
| 583 | 1913 |
| 1914 if (s == -1) { | |
| 1649 | 1915 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
| 583 | 1916 ngx_socket_n " failed"); |
| 1917 return NGX_ERROR; | |
| 1918 } | |
| 1919 | |
| 1649 | 1920 c = ngx_get_connection(s, uc->log); |
| 583 | 1921 |
| 1922 if (c == NULL) { | |
| 1923 if (ngx_close_socket(s) == -1) { | |
| 1649 | 1924 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, |
| 583 | 1925 ngx_close_socket_n "failed"); |
| 1926 } | |
| 1927 | |
| 1928 return NGX_ERROR; | |
| 1929 } | |
| 1930 | |
| 1649 | 1931 if (ngx_nonblocking(s) == -1) { |
| 1932 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
| 1933 ngx_nonblocking_n " failed"); | |
| 1934 | |
| 1935 ngx_free_connection(c); | |
| 1936 | |
| 1937 if (ngx_close_socket(s) == -1) { | |
| 1938 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno, | |
| 1939 ngx_close_socket_n " failed"); | |
| 1940 } | |
| 1941 | |
| 1942 return NGX_ERROR; | |
| 1943 } | |
| 1944 | |
| 583 | 1945 rev = c->read; |
| 1946 wev = c->write; | |
| 1947 | |
| 1649 | 1948 rev->log = uc->log; |
| 1949 wev->log = uc->log; | |
| 1950 | |
| 1951 uc->connection = c; | |
| 583 | 1952 |
| 1953 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); | |
| 1954 | |
| 1955 #if (NGX_THREADS) | |
| 1649 | 1956 |
| 1957 /* TODO: lock event when call completion handler */ | |
| 1958 | |
| 1959 rev->lock = &c->lock; | |
| 1960 wev->lock = &c->lock; | |
| 583 | 1961 rev->own_lock = &c->lock; |
| 1962 wev->own_lock = &c->lock; | |
| 1649 | 1963 |
| 583 | 1964 #endif |
| 1965 | |
| 1649 | 1966 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, uc->log, 0, |
| 1967 "connect to %V, fd:%d #%d", &uc->server, s, c->number); | |
| 1968 | |
| 1969 rc = connect(s, uc->sockaddr, uc->socklen); | |
| 1970 | |
| 1971 /* TODO: aio, iocp */ | |
| 583 | 1972 |
| 1973 if (rc == -1) { | |
| 1649 | 1974 ngx_log_error(NGX_LOG_CRIT, uc->log, ngx_socket_errno, |
| 1975 "connect() to %V failed", &uc->server); | |
| 583 | 1976 |
| 1977 return NGX_ERROR; | |
| 1978 } | |
| 1979 | |
| 1649 | 1980 /* UDP sockets are always ready to write */ |
| 1981 wev->ready = 1; | |
| 1982 | |
| 1983 if (ngx_add_event) { | |
| 1984 | |
| 1985 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ? | |
| 1986 /* kqueue, epoll */ NGX_CLEAR_EVENT: | |
| 1987 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT; | |
| 1988 /* eventport event type has no meaning: oneshot only */ | |
| 1989 | |
| 1990 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { | |
| 1991 return NGX_ERROR; | |
| 1992 } | |
| 1993 | |
| 1994 } else { | |
| 1995 /* rtsig */ | |
| 1996 | |
| 583 | 1997 if (ngx_add_conn(c) == NGX_ERROR) { |
| 1998 return NGX_ERROR; | |
| 1999 } | |
| 2000 } | |
| 2001 | |
| 2002 return NGX_OK; | |
| 2003 } |