Mercurial > hg > nginx
annotate src/core/ngx_resolver.c @ 4619:3171ec7d0d05
Resolver: protection from duplicate responses.
If we already had CNAME in resolver node (i.e. rn->cnlen and rn->u.cname
set), and got additional response with A record, it resulted in rn->cnlen
set and rn->u.cname overwritten by rn->u.addr (or rn->u.addrs), causing
segmentation fault later in ngx_resolver_free_node() on an attempt to free
overwritten rn->u.cname. The opposite (i.e. CNAME got after A) might cause
similar problems as well.
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Mon, 14 May 2012 09:13:45 +0000 |
| parents | 778d2cc03e22 |
| children | bc5f881323b8 |
| rev | line source |
|---|---|
| 583 | 1 |
| 2 /* | |
| 3 * Copyright (C) Igor Sysoev | |
| 4412 | 4 * Copyright (C) Nginx, Inc. |
| 583 | 5 */ |
| 6 | |
| 7 | |
| 8 #include <ngx_config.h> | |
| 9 #include <ngx_core.h> | |
| 10 #include <ngx_event.h> | |
| 11 | |
| 12 | |
| 1649 | 13 #define NGX_RESOLVER_UDP_SIZE 4096 |
| 14 | |
| 15 | |
| 583 | 16 typedef struct { |
| 1649 | 17 u_char ident_hi; |
| 18 u_char ident_lo; | |
| 19 u_char flags_hi; | |
| 20 u_char flags_lo; | |
| 21 u_char nqs_hi; | |
| 22 u_char nqs_lo; | |
| 23 u_char nan_hi; | |
| 24 u_char nan_lo; | |
| 25 u_char nns_hi; | |
| 26 u_char nns_lo; | |
| 27 u_char nar_hi; | |
| 28 u_char nar_lo; | |
| 29 } ngx_resolver_query_t; | |
| 30 | |
| 31 | |
| 32 typedef struct { | |
| 33 u_char type_hi; | |
| 34 u_char type_lo; | |
| 35 u_char class_hi; | |
| 36 u_char class_lo; | |
| 37 } ngx_resolver_qs_t; | |
| 38 | |
| 39 | |
| 40 typedef struct { | |
| 41 u_char type_hi; | |
| 42 u_char type_lo; | |
| 43 u_char class_hi; | |
| 44 u_char class_lo; | |
| 45 u_char ttl[4]; | |
| 46 u_char len_hi; | |
| 47 u_char len_lo; | |
| 48 } ngx_resolver_an_t; | |
| 49 | |
| 50 | |
| 51 ngx_int_t ngx_udp_connect(ngx_udp_connection_t *uc); | |
| 52 | |
| 53 | |
| 1906 | 54 static void ngx_resolver_cleanup(void *data); |
| 55 static void ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree); | |
| 1649 | 56 static ngx_int_t ngx_resolve_name_locked(ngx_resolver_t *r, |
| 57 ngx_resolver_ctx_t *ctx); | |
| 58 static void ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
| 59 ngx_queue_t *queue); | |
| 60 static ngx_int_t ngx_resolver_send_query(ngx_resolver_t *r, | |
| 61 ngx_resolver_node_t *rn); | |
| 62 static ngx_int_t ngx_resolver_create_name_query(ngx_resolver_node_t *rn, | |
| 63 ngx_resolver_ctx_t *ctx); | |
| 64 static ngx_int_t ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, | |
| 65 ngx_resolver_ctx_t *ctx); | |
| 66 static void ngx_resolver_resend_handler(ngx_event_t *ev); | |
| 67 static time_t ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
| 68 ngx_queue_t *queue); | |
| 69 static void ngx_resolver_read_response(ngx_event_t *rev); | |
| 70 static void ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, | |
| 71 size_t n); | |
| 72 static void ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t n, | |
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73 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans); |
| 1649 | 74 static void ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, |
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75 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan); |
| 1649 | 76 static ngx_resolver_node_t *ngx_resolver_lookup_name(ngx_resolver_t *r, |
| 77 ngx_str_t *name, uint32_t hash); | |
| 78 static ngx_resolver_node_t *ngx_resolver_lookup_addr(ngx_resolver_t *r, | |
| 79 in_addr_t addr); | |
| 80 static void ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
| 81 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel); | |
| 82 static ngx_int_t ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, | |
| 83 u_char *buf, u_char *src, u_char *last); | |
| 84 static void ngx_resolver_timeout_handler(ngx_event_t *ev); | |
| 85 static void ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn); | |
| 86 static void *ngx_resolver_alloc(ngx_resolver_t *r, size_t size); | |
| 1903 | 87 static void *ngx_resolver_calloc(ngx_resolver_t *r, size_t size); |
| 1649 | 88 static void ngx_resolver_free(ngx_resolver_t *r, void *p); |
| 89 static void ngx_resolver_free_locked(ngx_resolver_t *r, void *p); | |
| 90 static void *ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size); | |
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91 static u_char *ngx_resolver_log_error(ngx_log_t *log, u_char *buf, size_t len); |
| 1649 | 92 |
| 93 | |
| 94 ngx_resolver_t * | |
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95 ngx_resolver_create(ngx_conf_t *cf, ngx_str_t *names, ngx_uint_t n) |
| 1649 | 96 { |
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97 ngx_str_t s; |
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98 ngx_url_t u; |
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99 ngx_uint_t i; |
| 1649 | 100 ngx_resolver_t *r; |
| 1906 | 101 ngx_pool_cleanup_t *cln; |
| 1649 | 102 ngx_udp_connection_t *uc; |
| 103 | |
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104 cln = ngx_pool_cleanup_add(cf->pool, 0); |
| 1906 | 105 if (cln == NULL) { |
| 106 return NULL; | |
| 107 } | |
| 108 | |
| 109 cln->handler = ngx_resolver_cleanup; | |
| 110 | |
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111 r = ngx_calloc(sizeof(ngx_resolver_t), cf->log); |
| 1649 | 112 if (r == NULL) { |
| 113 return NULL; | |
| 114 } | |
| 115 | |
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116 if (n) { |
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117 if (ngx_array_init(&r->udp_connections, cf->pool, n, |
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118 sizeof(ngx_udp_connection_t)) |
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119 != NGX_OK) |
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120 { |
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121 return NULL; |
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122 } |
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123 } |
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124 |
| 1906 | 125 cln->data = r; |
| 126 | |
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127 r->event = ngx_calloc(sizeof(ngx_event_t), cf->log); |
| 1649 | 128 if (r->event == NULL) { |
| 129 return NULL; | |
| 130 } | |
| 131 | |
| 1687 | 132 ngx_rbtree_init(&r->name_rbtree, &r->name_sentinel, |
| 133 ngx_resolver_rbtree_insert_value); | |
| 134 | |
| 135 ngx_rbtree_init(&r->addr_rbtree, &r->addr_sentinel, | |
| 136 ngx_rbtree_insert_value); | |
| 1649 | 137 |
| 1685 | 138 ngx_queue_init(&r->name_resend_queue); |
| 139 ngx_queue_init(&r->addr_resend_queue); | |
| 140 | |
| 141 ngx_queue_init(&r->name_expire_queue); | |
| 142 ngx_queue_init(&r->addr_expire_queue); | |
| 1649 | 143 |
| 144 r->event->handler = ngx_resolver_resend_handler; | |
| 145 r->event->data = r; | |
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146 r->event->log = &cf->cycle->new_log; |
| 1649 | 147 r->ident = -1; |
| 148 | |
| 149 r->resend_timeout = 5; | |
| 150 r->expire = 30; | |
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151 r->valid = 0; |
| 1649 | 152 |
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153 r->log = &cf->cycle->new_log; |
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154 r->log_level = NGX_LOG_ERR; |
| 1649 | 155 |
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156 for (i = 0; i < n; i++) { |
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157 if (ngx_strncmp(names[i].data, "valid=", 6) == 0) { |
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158 s.len = names[i].len - 6; |
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159 s.data = names[i].data + 6; |
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160 |
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161 r->valid = ngx_parse_time(&s, 1); |
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162 |
| 4474 | 163 if (r->valid == (time_t) NGX_ERROR) { |
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164 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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165 "invalid parameter: %V", &names[i]); |
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166 return NULL; |
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167 } |
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168 |
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169 continue; |
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170 } |
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171 |
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172 ngx_memzero(&u, sizeof(ngx_url_t)); |
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173 |
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174 u.host = names[i]; |
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175 u.port = 53; |
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176 |
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177 if (ngx_inet_resolve_host(cf->pool, &u) != NGX_OK) { |
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178 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%V: %s", &u.host, u.err); |
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179 return NULL; |
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180 } |
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181 |
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182 uc = ngx_array_push(&r->udp_connections); |
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183 if (uc == NULL) { |
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184 return NULL; |
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185 } |
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186 |
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187 ngx_memzero(uc, sizeof(ngx_udp_connection_t)); |
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188 |
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189 uc->sockaddr = u.addrs->sockaddr; |
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190 uc->socklen = u.addrs->socklen; |
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191 uc->server = u.addrs->name; |
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192 } |
| 1649 | 193 |
| 194 return r; | |
| 195 } | |
| 196 | |
| 197 | |
| 1906 | 198 static void |
| 199 ngx_resolver_cleanup(void *data) | |
| 200 { | |
| 201 ngx_resolver_t *r = data; | |
| 202 | |
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203 ngx_uint_t i; |
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204 ngx_udp_connection_t *uc; |
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205 |
| 1906 | 206 if (r) { |
| 207 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, | |
| 208 "cleanup resolver"); | |
| 209 | |
| 210 ngx_resolver_cleanup_tree(r, &r->name_rbtree); | |
| 211 | |
| 212 ngx_resolver_cleanup_tree(r, &r->addr_rbtree); | |
| 213 | |
| 214 if (r->event) { | |
| 215 ngx_free(r->event); | |
| 216 } | |
| 217 | |
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218 |
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219 uc = r->udp_connections.elts; |
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220 |
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221 for (i = 0; i < r->udp_connections.nelts; i++) { |
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222 if (uc[i].connection) { |
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223 ngx_close_connection(uc[i].connection); |
| 1906 | 224 } |
| 225 } | |
| 226 | |
| 227 ngx_free(r); | |
| 228 } | |
| 229 } | |
| 230 | |
| 231 | |
| 232 static void | |
| 233 ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree) | |
| 234 { | |
| 235 ngx_resolver_ctx_t *ctx, *next; | |
| 236 ngx_resolver_node_t *rn; | |
| 237 | |
| 238 while (tree->root != tree->sentinel) { | |
| 239 | |
| 240 rn = (ngx_resolver_node_t *) ngx_rbtree_min(tree->root, tree->sentinel); | |
| 241 | |
| 242 ngx_queue_remove(&rn->queue); | |
| 243 | |
| 244 for (ctx = rn->waiting; ctx; ctx = next) { | |
|
2006
b52cb9bf2064
style fix: remove tabs and trailing spaces
Igor Sysoev <igor@sysoev.ru>
parents:
1969
diff
changeset
|
245 next = ctx->next; |
| 1906 | 246 |
| 247 if (ctx->event) { | |
| 248 ngx_resolver_free(r, ctx->event); | |
| 249 } | |
| 250 | |
| 251 ngx_resolver_free(r, ctx); | |
| 252 } | |
| 253 | |
| 254 ngx_rbtree_delete(tree, &rn->node); | |
| 255 | |
| 256 ngx_resolver_free_node(r, rn); | |
| 257 } | |
| 258 } | |
| 259 | |
| 260 | |
| 1649 | 261 ngx_resolver_ctx_t * |
| 262 ngx_resolve_start(ngx_resolver_t *r, ngx_resolver_ctx_t *temp) | |
| 263 { | |
| 264 in_addr_t addr; | |
| 265 ngx_resolver_ctx_t *ctx; | |
| 266 | |
| 267 if (temp) { | |
| 268 addr = ngx_inet_addr(temp->name.data, temp->name.len); | |
| 269 | |
| 270 if (addr != INADDR_NONE) { | |
| 271 temp->resolver = r; | |
| 272 temp->state = NGX_OK; | |
| 273 temp->naddrs = 1; | |
| 274 temp->addrs = &temp->addr; | |
| 275 temp->addr = addr; | |
| 276 temp->quick = 1; | |
| 277 | |
| 278 return temp; | |
| 279 } | |
| 280 } | |
| 281 | |
|
4225
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
282 if (r->udp_connections.nelts == 0) { |
|
1683
1e0b028055ec
allow to use IP addresses without defined resolver
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parents:
1679
diff
changeset
|
283 return NGX_NO_RESOLVER; |
|
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allow to use IP addresses without defined resolver
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parents:
1679
diff
changeset
|
284 } |
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allow to use IP addresses without defined resolver
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diff
changeset
|
285 |
| 1649 | 286 ctx = ngx_resolver_calloc(r, sizeof(ngx_resolver_ctx_t)); |
| 287 | |
| 288 if (ctx) { | |
| 289 ctx->resolver = r; | |
| 290 } | |
| 291 | |
| 292 return ctx; | |
| 293 } | |
| 294 | |
| 295 | |
| 296 ngx_int_t | |
| 297 ngx_resolve_name(ngx_resolver_ctx_t *ctx) | |
| 298 { | |
| 299 ngx_int_t rc; | |
| 300 ngx_resolver_t *r; | |
| 301 | |
| 302 r = ctx->resolver; | |
| 303 | |
| 304 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 305 "resolve: \"%V\"", &ctx->name); | |
| 306 | |
| 307 if (ctx->quick) { | |
| 308 ctx->handler(ctx); | |
| 309 return NGX_OK; | |
| 310 } | |
| 311 | |
| 312 /* lock name mutex */ | |
| 313 | |
| 314 rc = ngx_resolve_name_locked(r, ctx); | |
| 315 | |
| 316 if (rc == NGX_OK) { | |
| 317 return NGX_OK; | |
| 318 } | |
| 319 | |
| 320 /* unlock name mutex */ | |
| 321 | |
| 322 if (rc == NGX_AGAIN) { | |
| 323 return NGX_OK; | |
| 324 } | |
| 325 | |
|
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
326 /* NGX_ERROR */ |
| 1649 | 327 |
| 328 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
|
329 ngx_resolver_free(r, ctx->event); |
| 1649 | 330 } |
| 331 | |
|
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
332 ngx_resolver_free(r, ctx); |
| 1649 | 333 |
| 334 return NGX_ERROR; | |
| 335 } | |
| 336 | |
| 337 | |
| 338 void | |
| 339 ngx_resolve_name_done(ngx_resolver_ctx_t *ctx) | |
| 340 { | |
| 341 uint32_t hash; | |
| 342 ngx_resolver_t *r; | |
| 343 ngx_resolver_ctx_t *w, **p; | |
| 344 ngx_resolver_node_t *rn; | |
| 345 | |
| 346 r = ctx->resolver; | |
| 347 | |
| 348 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 349 "resolve name done: %i", ctx->state); | |
| 350 | |
| 351 if (ctx->quick) { | |
| 352 return; | |
| 353 } | |
| 354 | |
| 355 if (ctx->event && ctx->event->timer_set) { | |
| 356 ngx_del_timer(ctx->event); | |
| 357 } | |
| 358 | |
| 359 /* lock name mutex */ | |
| 360 | |
| 361 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
| 362 | |
| 363 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
| 364 | |
| 365 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
| 366 | |
| 367 if (rn) { | |
| 368 p = &rn->waiting; | |
| 369 w = rn->waiting; | |
| 370 | |
| 371 while (w) { | |
| 372 if (w == ctx) { | |
| 373 *p = w->next; | |
| 374 | |
| 375 goto done; | |
| 376 } | |
| 377 | |
| 378 p = &w->next; | |
| 379 w = w->next; | |
| 380 } | |
| 381 } | |
| 382 | |
| 383 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
| 384 "could not cancel %V resolving", &ctx->name); | |
| 385 } | |
| 386 | |
| 387 done: | |
| 388 | |
| 389 ngx_resolver_expire(r, &r->name_rbtree, &r->name_expire_queue); | |
| 390 | |
| 391 /* unlock name mutex */ | |
| 392 | |
|
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
393 /* 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
|
394 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
395 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
|
396 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
|
397 } |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
398 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
399 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
|
400 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
401 /* unlock alloc mutex */ |
| 1649 | 402 } |
| 403 | |
| 404 | |
| 405 /* NGX_RESOLVE_A only */ | |
| 406 | |
| 407 static ngx_int_t | |
| 408 ngx_resolve_name_locked(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx) | |
| 409 { | |
| 410 uint32_t hash; | |
| 411 in_addr_t addr, *addrs; | |
|
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
412 ngx_int_t rc; |
| 1649 | 413 ngx_uint_t naddrs; |
| 414 ngx_resolver_ctx_t *next; | |
| 415 ngx_resolver_node_t *rn; | |
| 416 | |
| 417 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
| 418 | |
| 419 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
| 420 | |
| 421 if (rn) { | |
| 422 | |
| 423 if (rn->valid >= ngx_time()) { | |
| 424 | |
| 425 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
| 426 | |
| 427 ngx_queue_remove(&rn->queue); | |
| 428 | |
| 429 rn->expire = ngx_time() + r->expire; | |
| 430 | |
| 431 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 432 | |
| 433 naddrs = rn->naddrs; | |
| 434 | |
| 435 if (naddrs) { | |
| 436 | |
| 437 /* NGX_RESOLVE_A answer */ | |
| 438 | |
| 439 if (naddrs != 1) { | |
| 440 addr = 0; | |
| 441 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
| 442 naddrs * sizeof(in_addr_t)); | |
| 443 if (addrs == NULL) { | |
| 444 return NGX_ERROR; | |
| 445 } | |
| 446 | |
| 447 } else { | |
| 448 addr = rn->u.addr; | |
| 449 addrs = NULL; | |
| 450 } | |
| 451 | |
| 452 ctx->next = rn->waiting; | |
| 453 rn->waiting = NULL; | |
| 454 | |
| 455 /* unlock name mutex */ | |
| 456 | |
| 457 do { | |
| 458 ctx->state = NGX_OK; | |
| 459 ctx->naddrs = naddrs; | |
| 460 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 461 ctx->addr = addr; | |
| 462 next = ctx->next; | |
| 463 | |
| 464 ctx->handler(ctx); | |
| 465 | |
| 466 ctx = next; | |
| 467 } while (ctx); | |
| 468 | |
| 469 if (addrs) { | |
| 470 ngx_resolver_free(r, addrs); | |
| 471 } | |
| 472 | |
| 473 return NGX_OK; | |
| 474 } | |
| 475 | |
| 476 /* NGX_RESOLVE_CNAME */ | |
| 477 | |
| 1969 | 478 if (ctx->recursion++ < NGX_RESOLVER_MAX_RECURSION) { |
| 479 | |
| 480 ctx->name.len = rn->cnlen; | |
| 481 ctx->name.data = rn->u.cname; | |
| 482 | |
| 483 return ngx_resolve_name_locked(r, ctx); | |
| 484 } | |
| 485 | |
| 486 ctx->next = rn->waiting; | |
| 487 rn->waiting = NULL; | |
| 488 | |
| 489 /* unlock name mutex */ | |
| 490 | |
| 491 do { | |
| 492 ctx->state = NGX_RESOLVE_NXDOMAIN; | |
| 493 next = ctx->next; | |
| 494 | |
| 495 ctx->handler(ctx); | |
| 496 | |
| 497 ctx = next; | |
| 498 } while (ctx); | |
| 499 | |
| 500 return NGX_OK; | |
| 1649 | 501 } |
| 502 | |
| 503 if (rn->waiting) { | |
| 504 | |
| 505 ctx->next = rn->waiting; | |
| 506 rn->waiting = ctx; | |
| 3297 | 507 ctx->state = NGX_AGAIN; |
| 1649 | 508 |
| 509 return NGX_AGAIN; | |
| 510 } | |
| 511 | |
| 512 ngx_queue_remove(&rn->queue); | |
| 513 | |
| 514 /* lock alloc mutex */ | |
| 515 | |
|
4619
3171ec7d0d05
Resolver: protection from duplicate responses.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4610
diff
changeset
|
516 if (rn->query) { |
|
3171ec7d0d05
Resolver: protection from duplicate responses.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4610
diff
changeset
|
517 ngx_resolver_free_locked(r, rn->query); |
|
3171ec7d0d05
Resolver: protection from duplicate responses.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4610
diff
changeset
|
518 rn->query = NULL; |
|
3171ec7d0d05
Resolver: protection from duplicate responses.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4610
diff
changeset
|
519 } |
| 1649 | 520 |
| 521 if (rn->cnlen) { | |
| 522 ngx_resolver_free_locked(r, rn->u.cname); | |
| 523 } | |
| 524 | |
| 525 if (rn->naddrs > 1) { | |
| 526 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 527 } | |
| 528 | |
| 529 /* unlock alloc mutex */ | |
| 530 | |
| 531 } else { | |
| 532 | |
| 533 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
| 534 if (rn == NULL) { | |
| 535 return NGX_ERROR; | |
| 536 } | |
| 537 | |
| 538 rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len); | |
| 539 if (rn->name == NULL) { | |
| 540 ngx_resolver_free(r, rn); | |
| 541 return NGX_ERROR; | |
| 542 } | |
| 543 | |
| 544 rn->node.key = hash; | |
| 545 rn->nlen = (u_short) ctx->name.len; | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
546 rn->query = NULL; |
| 1649 | 547 |
| 548 ngx_rbtree_insert(&r->name_rbtree, &rn->node); | |
| 549 } | |
| 550 | |
|
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
551 rc = ngx_resolver_create_name_query(rn, ctx); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
552 |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
553 if (rc == NGX_ERROR) { |
| 1649 | 554 goto failed; |
| 555 } | |
| 556 | |
|
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
557 if (rc == NGX_DECLINED) { |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
558 ngx_rbtree_delete(&r->name_rbtree, &rn->node); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
559 |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
560 ngx_resolver_free(r, rn->query); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
561 ngx_resolver_free(r, rn->name); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
562 ngx_resolver_free(r, rn); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
563 |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
564 ctx->state = NGX_RESOLVE_NXDOMAIN; |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
565 ctx->handler(ctx); |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
566 |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
567 return NGX_OK; |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
568 } |
|
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
569 |
| 1649 | 570 if (ngx_resolver_send_query(r, rn) != NGX_OK) { |
| 571 goto failed; | |
| 572 } | |
| 573 | |
| 574 if (ctx->event == NULL) { | |
| 575 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
| 576 if (ctx->event == NULL) { | |
| 577 goto failed; | |
| 578 } | |
| 579 | |
| 580 ctx->event->handler = ngx_resolver_timeout_handler; | |
| 581 ctx->event->data = ctx; | |
| 582 ctx->event->log = r->log; | |
| 583 ctx->ident = -1; | |
| 584 | |
| 585 ngx_add_timer(ctx->event, ctx->timeout); | |
| 586 } | |
| 587 | |
| 588 if (ngx_queue_empty(&r->name_resend_queue)) { | |
| 589 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
| 590 } | |
| 591 | |
| 592 rn->expire = ngx_time() + r->resend_timeout; | |
| 593 | |
| 594 ngx_queue_insert_head(&r->name_resend_queue, &rn->queue); | |
| 595 | |
| 596 rn->cnlen = 0; | |
| 597 rn->naddrs = 0; | |
| 598 rn->valid = 0; | |
| 599 rn->waiting = ctx; | |
| 600 | |
| 601 ctx->state = NGX_AGAIN; | |
| 602 | |
| 603 return NGX_AGAIN; | |
| 604 | |
| 605 failed: | |
| 606 | |
| 607 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 608 | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
609 if (rn->query) { |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
610 ngx_resolver_free(r, rn->query); |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
611 } |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
612 |
| 1649 | 613 ngx_resolver_free(r, rn->name); |
| 614 | |
| 615 ngx_resolver_free(r, rn); | |
| 616 | |
| 617 return NGX_ERROR; | |
| 618 } | |
| 583 | 619 |
| 620 | |
| 621 ngx_int_t | |
| 1649 | 622 ngx_resolve_addr(ngx_resolver_ctx_t *ctx) |
| 623 { | |
|
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
624 u_char *name; |
| 1649 | 625 ngx_resolver_t *r; |
| 626 ngx_resolver_node_t *rn; | |
| 627 | |
| 628 r = ctx->resolver; | |
| 629 | |
| 630 ctx->addr = ntohl(ctx->addr); | |
| 631 | |
| 632 /* lock addr mutex */ | |
| 633 | |
| 634 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
| 635 | |
| 636 if (rn) { | |
| 637 | |
| 638 if (rn->valid >= ngx_time()) { | |
| 639 | |
| 640 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
| 641 | |
| 642 ngx_queue_remove(&rn->queue); | |
| 643 | |
| 644 rn->expire = ngx_time() + r->expire; | |
| 645 | |
| 646 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
| 647 | |
|
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
648 name = ngx_resolver_dup(r, rn->name, rn->nlen); |
|
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
649 if (name == NULL) { |
| 1649 | 650 goto failed; |
| 651 } | |
| 652 | |
|
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
653 ctx->name.len = rn->nlen; |
|
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
654 ctx->name.data = name; |
|
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
655 |
| 1649 | 656 /* unlock addr mutex */ |
| 657 | |
| 658 ctx->state = NGX_OK; | |
| 659 | |
| 660 ctx->handler(ctx); | |
| 661 | |
|
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
662 ngx_resolver_free(r, name); |
| 1649 | 663 |
| 664 return NGX_OK; | |
| 665 } | |
| 666 | |
| 667 if (rn->waiting) { | |
| 668 | |
| 669 ctx->next = rn->waiting; | |
| 670 rn->waiting = ctx; | |
| 3297 | 671 ctx->state = NGX_AGAIN; |
| 1649 | 672 |
|
2487
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
673 /* unlock addr mutex */ |
|
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
674 |
|
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
675 return NGX_OK; |
| 1649 | 676 } |
| 677 | |
| 678 ngx_queue_remove(&rn->queue); | |
| 679 | |
| 680 ngx_resolver_free(r, rn->query); | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
681 rn->query = NULL; |
| 1649 | 682 |
| 683 } else { | |
| 684 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
| 685 if (rn == NULL) { | |
| 686 goto failed; | |
| 687 } | |
| 688 | |
| 689 rn->node.key = ctx->addr; | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
690 rn->query = NULL; |
| 1649 | 691 |
| 692 ngx_rbtree_insert(&r->addr_rbtree, &rn->node); | |
| 693 } | |
| 694 | |
| 695 if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) { | |
| 696 goto failed; | |
| 697 } | |
| 698 | |
| 699 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
| 700 goto failed; | |
| 701 } | |
| 702 | |
| 703 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
| 704 if (ctx->event == NULL) { | |
| 705 goto failed; | |
| 706 } | |
| 707 | |
| 708 ctx->event->handler = ngx_resolver_timeout_handler; | |
| 709 ctx->event->data = ctx; | |
| 710 ctx->event->log = r->log; | |
| 711 ctx->ident = -1; | |
| 712 | |
| 713 ngx_add_timer(ctx->event, ctx->timeout); | |
| 714 | |
| 715 if (ngx_queue_empty(&r->addr_resend_queue)) { | |
| 716 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
| 717 } | |
| 718 | |
| 719 rn->expire = ngx_time() + r->resend_timeout; | |
| 720 | |
| 721 ngx_queue_insert_head(&r->addr_resend_queue, &rn->queue); | |
| 722 | |
| 723 rn->cnlen = 0; | |
| 724 rn->naddrs = 0; | |
| 725 rn->name = NULL; | |
| 726 rn->nlen = 0; | |
| 727 rn->valid = 0; | |
| 728 rn->waiting = ctx; | |
| 729 | |
| 730 /* unlock addr mutex */ | |
| 731 | |
| 732 ctx->state = NGX_AGAIN; | |
| 733 | |
| 734 return NGX_OK; | |
| 735 | |
| 736 failed: | |
| 737 | |
| 738 if (rn) { | |
| 739 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 740 | |
|
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
741 if (rn->query) { |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
742 ngx_resolver_free(r, rn->query); |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
743 } |
|
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
744 |
| 1649 | 745 ngx_resolver_free(r, rn); |
| 746 } | |
| 747 | |
| 748 /* unlock addr mutex */ | |
| 749 | |
| 750 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
|
751 ngx_resolver_free(r, ctx->event); |
| 1649 | 752 } |
| 753 | |
|
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
754 ngx_resolver_free(r, ctx); |
| 1649 | 755 |
| 756 return NGX_ERROR; | |
| 757 } | |
| 758 | |
| 759 | |
| 760 void | |
| 761 ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx) | |
| 762 { | |
| 763 in_addr_t addr; | |
| 764 ngx_resolver_t *r; | |
| 765 ngx_resolver_ctx_t *w, **p; | |
| 766 ngx_resolver_node_t *rn; | |
| 767 | |
| 768 r = ctx->resolver; | |
| 769 | |
| 770 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 771 "resolve addr done: %i", ctx->state); | |
| 772 | |
| 773 if (ctx->event && ctx->event->timer_set) { | |
| 774 ngx_del_timer(ctx->event); | |
| 775 } | |
| 776 | |
| 777 /* lock addr mutex */ | |
| 778 | |
| 779 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
| 780 | |
| 781 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
| 782 | |
| 783 if (rn) { | |
| 784 p = &rn->waiting; | |
| 785 w = rn->waiting; | |
| 786 | |
| 787 while (w) { | |
| 788 if (w == ctx) { | |
| 789 *p = w->next; | |
| 790 | |
| 791 goto done; | |
| 792 } | |
| 793 | |
| 794 p = &w->next; | |
| 795 w = w->next; | |
| 796 } | |
| 797 } | |
| 798 | |
| 799 addr = ntohl(ctx->addr); | |
| 800 | |
| 801 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
| 802 "could not cancel %ud.%ud.%ud.%ud resolving", | |
| 803 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 804 (addr >> 8) & 0xff, addr & 0xff); | |
| 805 } | |
| 806 | |
| 807 done: | |
| 808 | |
| 809 ngx_resolver_expire(r, &r->addr_rbtree, &r->addr_expire_queue); | |
| 810 | |
| 811 /* unlock addr mutex */ | |
| 812 | |
|
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
813 /* 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
|
814 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
815 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
|
816 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
|
817 } |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
818 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
819 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
|
820 |
|
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
821 /* unlock alloc mutex */ |
| 1649 | 822 } |
| 823 | |
| 824 | |
| 825 static void | |
| 826 ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 827 { | |
| 828 time_t now; | |
| 829 ngx_uint_t i; | |
| 830 ngx_queue_t *q; | |
| 831 ngx_resolver_node_t *rn; | |
| 832 | |
| 833 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire"); | |
| 834 | |
| 835 now = ngx_time(); | |
| 836 | |
| 837 for (i = 0; i < 2; i++) { | |
| 838 if (ngx_queue_empty(queue)) { | |
| 839 return; | |
| 840 } | |
| 841 | |
| 842 q = ngx_queue_last(queue); | |
| 843 | |
| 844 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 845 | |
| 846 if (now <= rn->expire) { | |
| 847 return; | |
| 848 } | |
| 849 | |
| 1774 | 850 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, |
| 851 "resolver expire \"%*s\"", (size_t) rn->nlen, rn->name); | |
| 1649 | 852 |
| 853 ngx_queue_remove(q); | |
| 854 | |
| 855 ngx_rbtree_delete(tree, &rn->node); | |
| 856 | |
| 857 ngx_resolver_free_node(r, rn); | |
| 858 } | |
| 859 } | |
| 860 | |
| 861 | |
| 862 static ngx_int_t | |
| 863 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 864 { | |
| 865 ssize_t n; | |
| 866 ngx_udp_connection_t *uc; | |
| 867 | |
|
4225
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
868 uc = r->udp_connections.elts; |
|
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
869 |
|
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
870 uc = &uc[r->last_connection++]; |
|
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
871 if (r->last_connection == r->udp_connections.nelts) { |
|
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
872 r->last_connection = 0; |
|
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
873 } |
| 1649 | 874 |
| 875 if (uc->connection == NULL) { | |
|
4496
be6c250b827b
Fixed null pointer dereference in resolver (ticket #91).
Maxim Dounin <mdounin@mdounin.ru>
parents:
4474
diff
changeset
|
876 |
|
be6c250b827b
Fixed null pointer dereference in resolver (ticket #91).
Maxim Dounin <mdounin@mdounin.ru>
parents:
4474
diff
changeset
|
877 uc->log = *r->log; |
|
be6c250b827b
Fixed null pointer dereference in resolver (ticket #91).
Maxim Dounin <mdounin@mdounin.ru>
parents:
4474
diff
changeset
|
878 uc->log.handler = ngx_resolver_log_error; |
|
be6c250b827b
Fixed null pointer dereference in resolver (ticket #91).
Maxim Dounin <mdounin@mdounin.ru>
parents:
4474
diff
changeset
|
879 uc->log.data = uc; |
|
be6c250b827b
Fixed null pointer dereference in resolver (ticket #91).
Maxim Dounin <mdounin@mdounin.ru>
parents:
4474
diff
changeset
|
880 uc->log.action = "resolving"; |
|
be6c250b827b
Fixed null pointer dereference in resolver (ticket #91).
Maxim Dounin <mdounin@mdounin.ru>
parents:
4474
diff
changeset
|
881 |
| 1649 | 882 if (ngx_udp_connect(uc) != NGX_OK) { |
| 883 return NGX_ERROR; | |
| 884 } | |
| 885 | |
| 886 uc->connection->data = r; | |
| 887 uc->connection->read->handler = ngx_resolver_read_response; | |
| 1906 | 888 uc->connection->read->resolver = 1; |
| 1649 | 889 } |
| 890 | |
| 891 n = ngx_send(uc->connection, rn->query, rn->qlen); | |
| 892 | |
| 893 if (n == -1) { | |
| 894 return NGX_ERROR; | |
| 895 } | |
| 896 | |
| 897 if ((size_t) n != (size_t) rn->qlen) { | |
|
3408
71193a456616
add context to a resolver log
Igor Sysoev <igor@sysoev.ru>
parents:
3376
diff
changeset
|
898 ngx_log_error(NGX_LOG_CRIT, &uc->log, 0, "send() incomplete"); |
| 1649 | 899 return NGX_ERROR; |
| 900 } | |
| 901 | |
| 902 return NGX_OK; | |
| 903 } | |
| 904 | |
| 905 | |
| 906 static void | |
| 907 ngx_resolver_resend_handler(ngx_event_t *ev) | |
| 908 { | |
| 909 time_t timer, atimer, ntimer; | |
| 910 ngx_resolver_t *r; | |
| 911 | |
| 912 r = ev->data; | |
| 913 | |
| 914 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 915 "resolver resend handler"); | |
| 916 | |
| 917 /* lock name mutex */ | |
| 918 | |
| 919 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue); | |
| 920 | |
| 921 /* unlock name mutex */ | |
| 922 | |
| 923 /* lock addr mutex */ | |
| 924 | |
| 925 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
|
926 |
| 1649 | 927 /* unlock addr mutex */ |
| 928 | |
| 929 if (ntimer == 0) { | |
| 930 timer = atimer; | |
| 931 | |
| 932 } else if (atimer == 0) { | |
| 933 timer = ntimer; | |
| 934 | |
| 935 } else { | |
| 936 timer = (atimer < ntimer) ? atimer : ntimer; | |
| 937 } | |
| 938 | |
| 939 if (timer) { | |
| 940 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000)); | |
| 941 } | |
| 942 } | |
| 943 | |
| 944 | |
| 945 static time_t | |
| 946 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
| 947 { | |
| 948 time_t now; | |
| 949 ngx_queue_t *q; | |
| 950 ngx_resolver_node_t *rn; | |
| 951 | |
| 952 now = ngx_time(); | |
| 953 | |
| 954 for ( ;; ) { | |
| 955 if (ngx_queue_empty(queue)) { | |
| 956 return 0; | |
| 957 } | |
| 958 | |
| 959 q = ngx_queue_last(queue); | |
| 960 | |
| 961 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
| 962 | |
| 963 if (now < rn->expire) { | |
| 964 return rn->expire - now; | |
| 965 } | |
| 966 | |
| 1774 | 967 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, |
| 968 "resolver resend \"%*s\" %p", | |
| 969 (size_t) rn->nlen, rn->name, rn->waiting); | |
| 1649 | 970 |
| 971 ngx_queue_remove(q); | |
| 972 | |
| 973 if (rn->waiting) { | |
| 974 | |
| 975 if (ngx_resolver_send_query(r, rn) == NGX_OK) { | |
| 976 | |
| 977 rn->expire = now + r->resend_timeout; | |
| 978 | |
| 979 ngx_queue_insert_head(queue, &rn->queue); | |
| 980 } | |
|
1879
cf4ee321d195
do not delete failed DNS request if there are waiting clients
Igor Sysoev <igor@sysoev.ru>
parents:
1878
diff
changeset
|
981 |
|
cf4ee321d195
do not delete failed DNS request if there are waiting clients
Igor Sysoev <igor@sysoev.ru>
parents:
1878
diff
changeset
|
982 continue; |
| 1649 | 983 } |
| 984 | |
| 985 ngx_rbtree_delete(tree, &rn->node); | |
| 986 | |
| 987 ngx_resolver_free_node(r, rn); | |
| 988 } | |
| 989 } | |
| 990 | |
| 991 | |
| 992 static void | |
| 993 ngx_resolver_read_response(ngx_event_t *rev) | |
| 994 { | |
| 995 ssize_t n; | |
| 996 ngx_connection_t *c; | |
| 997 u_char buf[NGX_RESOLVER_UDP_SIZE]; | |
| 998 | |
| 999 c = rev->data; | |
| 1000 | |
| 1001 do { | |
| 1689 | 1002 n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE); |
| 1003 | |
| 1004 if (n < 0) { | |
| 1649 | 1005 return; |
| 1006 } | |
| 1007 | |
| 1008 ngx_resolver_process_response(c->data, buf, n); | |
| 1009 | |
| 1010 } while (rev->ready); | |
| 1011 } | |
| 1012 | |
| 1013 | |
| 1014 static void | |
| 1015 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n) | |
| 1016 { | |
| 1017 char *err; | |
| 1018 size_t len; | |
|
2282
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1019 ngx_uint_t i, times, ident, qident, flags, code, nqs, nan, |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1020 qtype, qclass; |
|
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1021 ngx_queue_t *q; |
| 1649 | 1022 ngx_resolver_qs_t *qs; |
|
2282
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1023 ngx_resolver_node_t *rn; |
| 1649 | 1024 ngx_resolver_query_t *query; |
| 1025 | |
|
2281
5004229420a6
FORMERR DNS response may be equal to mininal query size
Igor Sysoev <igor@sysoev.ru>
parents:
2006
diff
changeset
|
1026 if ((size_t) n < sizeof(ngx_resolver_query_t)) { |
| 1649 | 1027 goto short_response; |
| 1028 } | |
| 1029 | |
| 1030 query = (ngx_resolver_query_t *) buf; | |
| 1031 | |
| 1032 ident = (query->ident_hi << 8) + query->ident_lo; | |
| 1033 flags = (query->flags_hi << 8) + query->flags_lo; | |
| 1034 nqs = (query->nqs_hi << 8) + query->nqs_lo; | |
| 1035 nan = (query->nan_hi << 8) + query->nan_lo; | |
| 1036 | |
| 1037 ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0, | |
|
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1038 "resolver DNS response %ui fl:%04Xui %ui/%ui/%ui/%ui", |
| 1649 | 1039 ident, flags, nqs, nan, |
| 1040 (query->nns_hi << 8) + query->nns_lo, | |
| 1041 (query->nar_hi << 8) + query->nar_lo); | |
| 1042 | |
| 1043 if (!(flags & 0x8000)) { | |
| 1044 ngx_log_error(r->log_level, r->log, 0, | |
|
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1045 "invalid DNS response %ui fl:%04Xui", ident, flags); |
| 1649 | 1046 return; |
| 1047 } | |
| 1048 | |
| 1049 code = flags & 0x7f; | |
| 1050 | |
|
2282
ec97eb9a8038
show name for a FORMERR DNS response
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2281
diff
changeset
|
1051 if (code == NGX_RESOLVE_FORMERR) { |
|
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diff
changeset
|
1052 |
|
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|
1053 times = 0; |
|
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show name for a FORMERR DNS response
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diff
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|
1054 |
|
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diff
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|
1055 for (q = ngx_queue_head(&r->name_resend_queue); |
|
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diff
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|
1056 q != ngx_queue_sentinel(&r->name_resend_queue) || times++ < 100; |
|
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diff
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|
1057 q = ngx_queue_next(q)) |
|
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show name for a FORMERR DNS response
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diff
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|
1058 { |
|
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|
1059 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); |
|
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show name for a FORMERR DNS response
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diff
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|
1060 qident = (rn->query[0] << 8) + rn->query[1]; |
|
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|
1061 |
|
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1062 if (qident == ident) { |
|
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diff
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|
1063 ngx_log_error(r->log_level, r->log, 0, |
|
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diff
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|
1064 "DNS error (%ui: %s), query id:%ui, name:\"%*s\"", |
|
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diff
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|
1065 code, ngx_resolver_strerror(code), ident, |
|
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diff
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|
1066 rn->nlen, rn->name); |
|
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diff
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|
1067 return; |
|
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diff
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|
1068 } |
|
ec97eb9a8038
show name for a FORMERR DNS response
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|
1069 } |
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diff
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|
1070 |
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diff
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|
1071 goto dns_error; |
|
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show name for a FORMERR DNS response
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|
1072 } |
|
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|
1073 |
|
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diff
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|
1074 if (code > NGX_RESOLVE_REFUSED) { |
|
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show name for a FORMERR DNS response
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diff
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|
1075 goto dns_error; |
| 1649 | 1076 } |
| 1077 | |
| 1078 if (nqs != 1) { | |
| 1079 err = "invalid number of questions in DNS response"; | |
| 1080 goto done; | |
| 1081 } | |
| 1082 | |
| 1083 i = sizeof(ngx_resolver_query_t); | |
| 1084 | |
| 1085 while (i < (ngx_uint_t) n) { | |
| 1086 if (buf[i] == '\0') { | |
| 1087 goto found; | |
| 1088 } | |
| 1089 | |
| 1090 len = buf[i]; | |
| 1091 i += 1 + len; | |
| 1092 } | |
| 1093 | |
| 1094 goto short_response; | |
| 1095 | |
| 1096 found: | |
| 1097 | |
| 1098 if (i++ == 0) { | |
| 1099 err = "zero-length domain name in DNS response"; | |
| 1100 goto done; | |
| 1101 } | |
| 1102 | |
| 1103 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t)) | |
| 1104 > (ngx_uint_t) n) | |
| 1105 { | |
| 1106 goto short_response; | |
| 1107 } | |
| 1108 | |
| 1109 qs = (ngx_resolver_qs_t *) &buf[i]; | |
| 1110 | |
| 1111 qtype = (qs->type_hi << 8) + qs->type_lo; | |
| 1112 qclass = (qs->class_hi << 8) + qs->class_lo; | |
| 1113 | |
| 1114 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
|
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diff
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|
1115 "resolver DNS response qt:%ui cl:%ui", qtype, qclass); |
| 1649 | 1116 |
| 1117 if (qclass != 1) { | |
| 1118 ngx_log_error(r->log_level, r->log, 0, | |
|
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
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diff
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|
1119 "unknown query class %ui in DNS response", qclass); |
| 1649 | 1120 return; |
| 1121 } | |
| 1122 | |
| 1123 switch (qtype) { | |
| 1124 | |
| 1125 case NGX_RESOLVE_A: | |
| 1126 | |
| 1127 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>
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diff
changeset
|
1128 i + sizeof(ngx_resolver_qs_t)); |
| 1649 | 1129 |
| 1130 break; | |
| 1131 | |
| 1132 case NGX_RESOLVE_PTR: | |
| 1133 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
1134 ngx_resolver_process_ptr(r, buf, n, ident, code, nan); |
| 1649 | 1135 |
| 1136 break; | |
| 1137 | |
| 1138 default: | |
| 1139 ngx_log_error(r->log_level, r->log, 0, | |
|
1967
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1966
diff
changeset
|
1140 "unknown query type %ui in DNS response", qtype); |
| 1649 | 1141 return; |
| 1142 } | |
| 1143 | |
| 1144 return; | |
| 1145 | |
| 1146 short_response: | |
| 1147 | |
| 1148 err = "short dns response"; | |
| 1149 | |
| 1150 done: | |
| 1151 | |
| 1152 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1153 | |
| 1154 return; | |
|
2282
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|
1155 |
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|
1156 dns_error: |
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diff
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|
1157 |
|
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|
1158 ngx_log_error(r->log_level, r->log, 0, |
|
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show name for a FORMERR DNS response
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diff
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|
1159 "DNS error (%ui: %s), query id:%ui", |
|
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diff
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|
1160 code, ngx_resolver_strerror(code), ident); |
|
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show name for a FORMERR DNS response
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diff
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|
1161 return; |
| 1649 | 1162 } |
| 1163 | |
| 1164 | |
| 1165 static void | |
| 1166 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last, | |
| 1167 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans) | |
| 583 | 1168 { |
| 1649 | 1169 char *err; |
| 1170 u_char *cname; | |
| 1171 size_t len; | |
|
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diff
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|
1172 int32_t ttl; |
| 1649 | 1173 uint32_t hash; |
| 1174 in_addr_t addr, *addrs; | |
| 1175 ngx_str_t name; | |
| 1176 ngx_uint_t qtype, qident, naddrs, a, i, n, start; | |
| 1177 ngx_resolver_an_t *an; | |
| 1178 ngx_resolver_ctx_t *ctx, *next; | |
| 1179 ngx_resolver_node_t *rn; | |
| 1180 | |
| 1181 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) { | |
| 1182 return; | |
| 1183 } | |
| 1184 | |
| 1185 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); | |
| 1186 | |
| 1187 hash = ngx_crc32_short(name.data, name.len); | |
| 1188 | |
| 1189 /* lock name mutex */ | |
| 1190 | |
| 1191 rn = ngx_resolver_lookup_name(r, &name, hash); | |
| 1192 | |
| 1193 if (rn == NULL || rn->query == NULL) { | |
| 1194 ngx_log_error(r->log_level, r->log, 0, | |
| 1195 "unexpected response for %V", &name); | |
| 1196 goto failed; | |
| 1197 } | |
| 1198 | |
| 1199 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 1200 | |
| 1201 if (ident != qident) { | |
| 1202 ngx_log_error(r->log_level, r->log, 0, | |
|
1967
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Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1203 "wrong ident %ui response for %V, expect %ui", |
| 1649 | 1204 ident, &name, qident); |
| 1205 goto failed; | |
| 1206 } | |
| 1207 | |
| 3139 | 1208 ngx_resolver_free(r, name.data); |
| 1209 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1210 if (code == 0 && nan == 0) { |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1211 code = 3; /* NXDOMAIN */ |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
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parents:
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diff
changeset
|
1212 } |
|
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parents:
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diff
changeset
|
1213 |
| 1649 | 1214 if (code) { |
| 1215 next = rn->waiting; | |
| 1216 rn->waiting = NULL; | |
| 1217 | |
| 1218 ngx_queue_remove(&rn->queue); | |
| 1219 | |
| 1220 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
| 1221 | |
| 1222 ngx_resolver_free_node(r, rn); | |
| 1223 | |
| 1224 /* unlock name mutex */ | |
| 1225 | |
| 1226 while (next) { | |
| 1227 ctx = next; | |
| 1228 ctx->state = code; | |
| 1229 next = ctx->next; | |
| 1230 | |
| 1231 ctx->handler(ctx); | |
| 1232 } | |
| 1233 | |
| 1234 return; | |
| 1235 } | |
| 1236 | |
| 1237 i = ans; | |
| 1238 naddrs = 0; | |
| 1239 addr = 0; | |
| 1240 addrs = NULL; | |
| 1241 cname = NULL; | |
| 1242 qtype = 0; | |
|
4296
783fd9c38d98
Silenced a warning for some compilers.
Ruslan Ermilov <ru@nginx.com>
parents:
4295
diff
changeset
|
1243 ttl = 0; |
| 1649 | 1244 |
| 1245 for (a = 0; a < nan; a++) { | |
| 1246 | |
| 1247 start = i; | |
| 1248 | |
| 1249 while (i < last) { | |
| 1250 | |
| 1251 if (buf[i] & 0xc0) { | |
| 1252 i += 2; | |
| 1253 goto found; | |
| 1254 } | |
| 1255 | |
| 1256 if (buf[i] == 0) { | |
| 1257 i++; | |
| 1258 goto test_length; | |
| 1259 } | |
| 1260 | |
| 1261 i += 1 + buf[i]; | |
| 1262 } | |
| 1263 | |
| 1264 goto short_response; | |
| 1265 | |
| 1266 test_length: | |
| 1267 | |
| 1268 if (i - start < 2) { | |
| 1269 err = "invalid name in dns response"; | |
| 1270 goto invalid; | |
| 1271 } | |
| 1272 | |
| 1273 found: | |
| 1274 | |
| 1275 if (i + sizeof(ngx_resolver_an_t) >= last) { | |
| 1276 goto short_response; | |
| 1277 } | |
| 1278 | |
| 1279 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1280 | |
| 1281 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1282 len = (an->len_hi << 8) + an->len_lo; | |
|
4295
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Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1283 ttl = (an->ttl[0] << 24) + (an->ttl[1] << 16) |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1284 + (an->ttl[2] << 8) + (an->ttl[3]); |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1285 |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1286 if (ttl < 0) { |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
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parents:
4267
diff
changeset
|
1287 ttl = 0; |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
1288 } |
| 1649 | 1289 |
| 1290 if (qtype == NGX_RESOLVE_A) { | |
| 1291 | |
| 1292 i += sizeof(ngx_resolver_an_t); | |
| 1293 | |
| 1294 if (i + len > last) { | |
| 1295 goto short_response; | |
| 1296 } | |
| 1297 | |
| 1298 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1299 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1300 | |
| 1301 naddrs++; | |
| 1302 | |
| 1303 i += len; | |
| 1304 | |
| 1305 } else if (qtype == NGX_RESOLVE_CNAME) { | |
| 1306 cname = &buf[i] + sizeof(ngx_resolver_an_t); | |
| 1307 i += sizeof(ngx_resolver_an_t) + len; | |
| 1965 | 1308 |
| 1309 } else if (qtype == NGX_RESOLVE_DNAME) { | |
| 1310 i += sizeof(ngx_resolver_an_t) + len; | |
| 1966 | 1311 |
| 1312 } else { | |
| 1313 ngx_log_error(r->log_level, r->log, 0, | |
| 1314 "unexpected qtype %ui", qtype); | |
| 1649 | 1315 } |
| 1316 } | |
| 1317 | |
|
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
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diff
changeset
|
1318 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1319 "resolver naddrs:%ui cname:%p ttl:%d", |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1320 naddrs, cname, ttl); |
| 1649 | 1321 |
| 1322 if (naddrs) { | |
| 1323 | |
| 1324 if (naddrs == 1) { | |
| 1325 rn->u.addr = addr; | |
| 1326 | |
| 1327 } else { | |
| 1328 | |
| 1329 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t)); | |
| 1330 if (addrs == NULL) { | |
| 1331 return; | |
| 1332 } | |
| 1333 | |
| 1334 n = 0; | |
| 1335 i = ans; | |
| 1336 | |
| 1337 for (a = 0; a < nan; a++) { | |
| 1338 | |
| 1339 for ( ;; ) { | |
| 1340 | |
| 1341 if (buf[i] & 0xc0) { | |
| 1342 i += 2; | |
| 1343 goto ok; | |
| 1344 } | |
| 1345 | |
| 1346 if (buf[i] == 0) { | |
| 1347 i++; | |
| 1348 goto ok; | |
| 1349 } | |
| 1350 | |
| 1351 i += 1 + buf[i]; | |
| 1352 } | |
| 1353 | |
| 1354 ok: | |
| 1355 | |
| 1356 an = (ngx_resolver_an_t *) &buf[i]; | |
| 1357 | |
| 1358 qtype = (an->type_hi << 8) + an->type_lo; | |
| 1359 len = (an->len_hi << 8) + an->len_lo; | |
| 1360 | |
| 1361 i += sizeof(ngx_resolver_an_t); | |
| 1362 | |
| 1363 if (qtype == NGX_RESOLVE_A) { | |
| 1364 | |
| 1365 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
| 1366 + (buf[i + 2] << 8) + (buf[i + 3])); | |
| 1367 | |
| 1368 if (n == naddrs) { | |
| 1369 break; | |
| 1370 } | |
| 1371 } | |
| 1372 | |
| 1373 i += len; | |
| 1374 } | |
| 1375 | |
| 1376 rn->u.addrs = addrs; | |
| 1377 | |
| 1378 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
| 1379 naddrs * sizeof(in_addr_t)); | |
| 1380 if (addrs == NULL) { | |
| 1381 return; | |
| 1382 } | |
| 1383 } | |
| 1384 | |
| 1385 rn->naddrs = (u_short) naddrs; | |
| 1386 | |
| 1387 ngx_queue_remove(&rn->queue); | |
| 1388 | |
|
4295
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parents:
4267
diff
changeset
|
1389 rn->valid = ngx_time() + (r->valid ? r->valid : ttl); |
| 1649 | 1390 rn->expire = ngx_time() + r->expire; |
| 1391 | |
| 1392 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1393 | |
| 1394 next = rn->waiting; | |
| 1395 rn->waiting = NULL; | |
| 1396 | |
| 1397 /* unlock name mutex */ | |
| 1398 | |
| 1399 while (next) { | |
| 1400 ctx = next; | |
| 1401 ctx->state = NGX_OK; | |
| 1402 ctx->naddrs = naddrs; | |
| 1403 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
| 1404 ctx->addr = addr; | |
| 1405 next = ctx->next; | |
| 1406 | |
| 1407 ctx->handler(ctx); | |
| 1408 } | |
| 1409 | |
|
2483
29494780d978
free addrs only it has been allocated before: non single address
Igor Sysoev <igor@sysoev.ru>
parents:
2482
diff
changeset
|
1410 if (naddrs > 1) { |
| 1649 | 1411 ngx_resolver_free(r, addrs); |
| 1412 } | |
| 1413 | |
|
4619
3171ec7d0d05
Resolver: protection from duplicate responses.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4610
diff
changeset
|
1414 ngx_resolver_free(r, rn->query); |
|
3171ec7d0d05
Resolver: protection from duplicate responses.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4610
diff
changeset
|
1415 rn->query = NULL; |
|
3171ec7d0d05
Resolver: protection from duplicate responses.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4610
diff
changeset
|
1416 |
| 1649 | 1417 return; |
| 1418 | |
| 1419 } else if (cname) { | |
| 1420 | |
| 1421 /* CNAME only */ | |
| 1422 | |
| 1423 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) { | |
| 1424 return; | |
| 1425 } | |
| 1426 | |
| 1427 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
| 1428 "resolver cname:\"%V\"", &name); | |
| 1429 | |
|
1741
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1430 ngx_queue_remove(&rn->queue); |
|
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1431 |
| 1649 | 1432 rn->cnlen = (u_short) name.len; |
| 1433 rn->u.cname = name.data; | |
|
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1434 |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1435 rn->valid = ngx_time() + (r->valid ? r->valid : ttl); |
| 1649 | 1436 rn->expire = ngx_time() + r->expire; |
| 1437 | |
| 1438 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
| 1439 | |
| 1440 ctx = rn->waiting; | |
| 1441 rn->waiting = NULL; | |
| 1442 | |
| 1443 if (ctx) { | |
| 1444 ctx->name = name; | |
| 1445 | |
| 1446 (void) ngx_resolve_name_locked(r, ctx); | |
| 1447 } | |
| 1448 | |
|
4619
3171ec7d0d05
Resolver: protection from duplicate responses.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4610
diff
changeset
|
1449 ngx_resolver_free(r, rn->query); |
|
3171ec7d0d05
Resolver: protection from duplicate responses.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4610
diff
changeset
|
1450 rn->query = NULL; |
|
3171ec7d0d05
Resolver: protection from duplicate responses.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4610
diff
changeset
|
1451 |
| 1649 | 1452 return; |
| 1453 } | |
| 1454 | |
| 1455 ngx_log_error(r->log_level, r->log, 0, | |
|
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1456 "no A or CNAME types in DNS responses, unknown query type: %ui", |
|
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1457 qtype); |
| 1649 | 1458 return; |
| 1459 | |
| 1460 short_response: | |
| 1461 | |
| 1462 err = "short dns response"; | |
| 1463 | |
| 1464 invalid: | |
| 1465 | |
| 1466 /* unlock name mutex */ | |
| 1467 | |
| 1468 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1469 | |
| 1470 return; | |
| 1471 | |
| 1472 failed: | |
| 1473 | |
| 1474 /* unlock name mutex */ | |
| 1475 | |
| 3139 | 1476 ngx_resolver_free(r, name.data); |
| 1477 | |
| 1649 | 1478 return; |
| 1479 } | |
| 1480 | |
| 1481 | |
| 1482 static void | |
| 1483 ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1484 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan) |
| 1649 | 1485 { |
| 1486 char *err; | |
| 1487 size_t len; | |
| 1488 in_addr_t addr; | |
|
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1489 int32_t ttl; |
| 1649 | 1490 ngx_int_t digit; |
| 1491 ngx_str_t name; | |
|
3902
159b58f9c0bd
fix building by gcc 4.6 without --with-debug
Igor Sysoev <igor@sysoev.ru>
parents:
3763
diff
changeset
|
1492 ngx_uint_t i, mask, qident; |
| 1649 | 1493 ngx_resolver_an_t *an; |
| 1494 ngx_resolver_ctx_t *ctx, *next; | |
| 1495 ngx_resolver_node_t *rn; | |
| 1496 | |
| 1497 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) { | |
| 1498 goto invalid_in_addr_arpa; | |
| 1499 } | |
| 1500 | |
| 1501 addr = 0; | |
| 1502 i = 12; | |
| 1503 | |
| 1504 for (mask = 0; mask < 32; mask += 8) { | |
| 1505 len = buf[i++]; | |
| 1506 | |
| 1507 digit = ngx_atoi(&buf[i], len); | |
| 1508 if (digit == NGX_ERROR || digit > 255) { | |
| 1509 goto invalid_in_addr_arpa; | |
| 1510 } | |
| 1511 | |
| 1512 addr += digit << mask; | |
| 1513 i += len; | |
| 1514 } | |
| 1515 | |
| 1516 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) { | |
| 1517 goto invalid_in_addr_arpa; | |
| 1518 } | |
| 1519 | |
| 1520 /* lock addr mutex */ | |
| 1521 | |
| 1522 rn = ngx_resolver_lookup_addr(r, addr); | |
| 1523 | |
| 1524 if (rn == NULL || rn->query == NULL) { | |
| 1525 ngx_log_error(r->log_level, r->log, 0, | |
| 1526 "unexpected response for %ud.%ud.%ud.%ud", | |
| 1527 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
| 1528 (addr >> 8) & 0xff, addr & 0xff); | |
| 1529 goto failed; | |
| 1530 } | |
| 1531 | |
| 1532 qident = (rn->query[0] << 8) + rn->query[1]; | |
| 1533 | |
| 1534 if (ident != qident) { | |
| 1535 ngx_log_error(r->log_level, r->log, 0, | |
|
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1536 "wrong ident %ui response for %ud.%ud.%ud.%ud, expect %ui", |
|
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1537 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff, |
|
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1538 (addr >> 8) & 0xff, addr & 0xff, qident); |
| 1649 | 1539 goto failed; |
| 1540 } | |
| 1541 | |
|
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1542 if (code == 0 && nan == 0) { |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1543 code = 3; /* NXDOMAIN */ |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1544 } |
|
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1545 |
| 1649 | 1546 if (code) { |
| 1547 next = rn->waiting; | |
| 1548 rn->waiting = NULL; | |
| 1549 | |
| 1550 ngx_queue_remove(&rn->queue); | |
| 1551 | |
| 1552 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
| 1553 | |
| 1554 ngx_resolver_free_node(r, rn); | |
| 1555 | |
| 1556 /* unlock addr mutex */ | |
| 1557 | |
| 1558 while (next) { | |
| 1559 ctx = next; | |
| 1560 ctx->state = code; | |
| 1561 next = ctx->next; | |
| 1562 | |
| 1563 ctx->handler(ctx); | |
| 1564 } | |
| 1565 | |
| 1566 return; | |
| 1567 } | |
| 1568 | |
| 1569 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t); | |
| 1570 | |
| 1571 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) { | |
| 1572 goto short_response; | |
| 1573 } | |
| 1574 | |
| 1575 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */ | |
| 1576 | |
| 1577 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) { | |
| 1578 err = "invalid in-addr.arpa name in DNS response"; | |
| 1579 goto invalid; | |
| 1580 } | |
| 1581 | |
| 1582 an = (ngx_resolver_an_t *) &buf[i + 2]; | |
| 1583 | |
| 1584 len = (an->len_hi << 8) + an->len_lo; | |
|
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1585 ttl = (an->ttl[0] << 24) + (an->ttl[1] << 16) |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1586 + (an->ttl[2] << 8) + (an->ttl[3]); |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1587 |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1588 if (ttl < 0) { |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1589 ttl = 0; |
|
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1590 } |
| 1649 | 1591 |
| 1592 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, | |
|
3902
159b58f9c0bd
fix building by gcc 4.6 without --with-debug
Igor Sysoev <igor@sysoev.ru>
parents:
3763
diff
changeset
|
1593 "resolver qt:%ui cl:%ui len:%uz", |
|
159b58f9c0bd
fix building by gcc 4.6 without --with-debug
Igor Sysoev <igor@sysoev.ru>
parents:
3763
diff
changeset
|
1594 (an->type_hi << 8) + an->type_lo, |
|
159b58f9c0bd
fix building by gcc 4.6 without --with-debug
Igor Sysoev <igor@sysoev.ru>
parents:
3763
diff
changeset
|
1595 (an->class_hi << 8) + an->class_lo, len); |
| 1649 | 1596 |
| 1597 i += 2 + sizeof(ngx_resolver_an_t); | |
| 1598 | |
| 1599 if (i + len > (ngx_uint_t) n) { | |
| 1600 goto short_response; | |
| 1601 } | |
| 1602 | |
| 1603 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) { | |
| 1604 return; | |
| 1605 } | |
| 1606 | |
| 1607 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name); | |
| 1608 | |
|
2486
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1609 if (name.len != (size_t) rn->nlen |
|
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1610 || ngx_strncmp(name.data, rn->name, name.len) != 0) |
| 1649 | 1611 { |
|
2482
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1612 if (rn->nlen) { |
|
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1613 ngx_resolver_free(r, rn->name); |
|
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1614 } |
|
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1615 |
|
2490
1c87647b7ca5
fix building by msvc, introduced in r2487
Igor Sysoev <igor@sysoev.ru>
parents:
2487
diff
changeset
|
1616 rn->nlen = (u_short) name.len; |
| 1649 | 1617 rn->name = name.data; |
| 1618 | |
|
2486
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1619 name.data = ngx_resolver_dup(r, rn->name, name.len); |
| 1649 | 1620 if (name.data == NULL) { |
| 1621 goto failed; | |
| 1622 } | |
| 1623 } | |
| 1624 | |
| 1625 ngx_queue_remove(&rn->queue); | |
| 1626 | |
|
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1627 rn->valid = ngx_time() + (r->valid ? r->valid : ttl); |
| 1649 | 1628 rn->expire = ngx_time() + r->expire; |
| 1629 | |
| 1630 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
| 1631 | |
| 1632 next = rn->waiting; | |
| 1633 rn->waiting = NULL; | |
| 1634 | |
| 1635 /* unlock addr mutex */ | |
| 1636 | |
| 1637 while (next) { | |
| 1638 ctx = next; | |
| 1639 ctx->state = NGX_OK; | |
| 1640 ctx->name = name; | |
| 1641 next = ctx->next; | |
| 1642 | |
| 1643 ctx->handler(ctx); | |
| 1644 } | |
| 1645 | |
| 1646 ngx_resolver_free(r, name.data); | |
| 1647 | |
| 1648 return; | |
| 1649 | |
| 1650 invalid_in_addr_arpa: | |
| 1651 | |
| 1652 ngx_log_error(r->log_level, r->log, 0, | |
| 1653 "invalid in-addr.arpa name in DNS response"); | |
| 1654 return; | |
| 1655 | |
| 1656 short_response: | |
| 1657 | |
| 1658 err = "short DNS response"; | |
| 1659 | |
| 1660 invalid: | |
| 1661 | |
| 1662 /* unlock addr mutex */ | |
| 1663 | |
| 1664 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1665 | |
| 1666 return; | |
| 1667 | |
| 1668 failed: | |
| 1669 | |
| 1670 /* unlock addr mutex */ | |
| 1671 | |
| 1672 return; | |
| 1673 } | |
| 1674 | |
| 1675 | |
| 1676 static ngx_resolver_node_t * | |
| 1677 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) | |
| 1678 { | |
| 1679 ngx_int_t rc; | |
| 1680 ngx_rbtree_node_t *node, *sentinel; | |
| 1681 ngx_resolver_node_t *rn; | |
| 1682 | |
| 1683 node = r->name_rbtree.root; | |
| 1684 sentinel = r->name_rbtree.sentinel; | |
| 1685 | |
| 1686 while (node != sentinel) { | |
| 1687 | |
| 1688 if (hash < node->key) { | |
| 1689 node = node->left; | |
| 1690 continue; | |
| 1691 } | |
| 1692 | |
| 1693 if (hash > node->key) { | |
| 1694 node = node->right; | |
| 1695 continue; | |
| 1696 } | |
| 1697 | |
| 1698 /* hash == node->key */ | |
| 1699 | |
|
4497
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1700 rn = (ngx_resolver_node_t *) node; |
|
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1701 |
|
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1702 rc = ngx_memn2cmp(name->data, rn->name, name->len, rn->nlen); |
|
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1703 |
|
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1704 if (rc == 0) { |
|
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1705 return rn; |
|
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1706 } |
|
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1707 |
|
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1708 node = (rc < 0) ? node->left : node->right; |
| 1649 | 1709 } |
| 1710 | |
| 1711 /* not found */ | |
| 1712 | |
| 1713 return NULL; | |
| 1714 } | |
| 1715 | |
| 1716 | |
| 1717 static ngx_resolver_node_t * | |
| 1718 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr) | |
| 1719 { | |
| 1720 ngx_rbtree_node_t *node, *sentinel; | |
| 1721 | |
| 1722 node = r->addr_rbtree.root; | |
| 1723 sentinel = r->addr_rbtree.sentinel; | |
| 1724 | |
| 1725 while (node != sentinel) { | |
| 1726 | |
| 1727 if (addr < node->key) { | |
| 1728 node = node->left; | |
| 1729 continue; | |
| 1730 } | |
| 1731 | |
| 1732 if (addr > node->key) { | |
| 1733 node = node->right; | |
| 1734 continue; | |
| 1735 } | |
| 1736 | |
| 1737 /* addr == node->key */ | |
| 1738 | |
| 1739 return (ngx_resolver_node_t *) node; | |
| 1740 } | |
| 1741 | |
| 1742 /* not found */ | |
| 1743 | |
| 1744 return NULL; | |
| 1745 } | |
| 1746 | |
| 1747 | |
| 1748 static void | |
| 1749 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
| 1750 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
| 1751 { | |
| 1752 ngx_rbtree_node_t **p; | |
| 1753 ngx_resolver_node_t *rn, *rn_temp; | |
| 1754 | |
| 1755 for ( ;; ) { | |
| 1756 | |
| 1757 if (node->key < temp->key) { | |
| 1758 | |
| 1759 p = &temp->left; | |
| 1760 | |
| 1761 } else if (node->key > temp->key) { | |
| 1762 | |
| 1763 p = &temp->right; | |
| 1764 | |
| 1765 } else { /* node->key == temp->key */ | |
| 1766 | |
| 1767 rn = (ngx_resolver_node_t *) node; | |
| 1768 rn_temp = (ngx_resolver_node_t *) temp; | |
| 1769 | |
|
3143
ab6258e18099
fix resolver cache rbtree comparison
Igor Sysoev <igor@sysoev.ru>
parents:
3139
diff
changeset
|
1770 p = (ngx_memn2cmp(rn->name, rn_temp->name, rn->nlen, rn_temp->nlen) |
|
ab6258e18099
fix resolver cache rbtree comparison
Igor Sysoev <igor@sysoev.ru>
parents:
3139
diff
changeset
|
1771 < 0) ? &temp->left : &temp->right; |
| 1649 | 1772 } |
| 1773 | |
| 1774 if (*p == sentinel) { | |
| 1775 break; | |
| 1776 } | |
| 1777 | |
| 1778 temp = *p; | |
| 1779 } | |
| 1780 | |
| 1781 *p = node; | |
| 1782 node->parent = temp; | |
| 1783 node->left = sentinel; | |
| 1784 node->right = sentinel; | |
| 1785 ngx_rbt_red(node); | |
| 1786 } | |
| 1787 | |
| 1788 | |
| 1789 static ngx_int_t | |
| 1790 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1791 { | |
| 1792 u_char *p, *s; | |
|
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1793 size_t len, nlen; |
| 1649 | 1794 ngx_uint_t ident; |
| 1795 ngx_resolver_qs_t *qs; | |
| 1796 ngx_resolver_query_t *query; | |
| 1797 | |
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1798 nlen = ctx->name.len ? (1 + ctx->name.len + 1) : 1; |
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1799 |
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1800 len = sizeof(ngx_resolver_query_t) + nlen + sizeof(ngx_resolver_qs_t); |
| 1649 | 1801 |
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1802 p = ngx_resolver_alloc(ctx->resolver, len); |
| 1649 | 1803 if (p == NULL) { |
| 1804 return NGX_ERROR; | |
| 1805 } | |
| 1806 | |
| 1807 rn->qlen = (u_short) len; | |
| 1808 rn->query = p; | |
| 1809 | |
| 1810 query = (ngx_resolver_query_t *) p; | |
| 1811 | |
| 1812 ident = ngx_random(); | |
| 1813 | |
| 1814 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0, | |
| 1815 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff); | |
| 1816 | |
| 1817 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1818 query->ident_lo = (u_char) (ident & 0xff); | |
| 1819 | |
| 1820 /* recursion query */ | |
| 1821 query->flags_hi = 1; query->flags_lo = 0; | |
| 1822 | |
| 1823 /* one question */ | |
| 1824 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1825 query->nan_hi = 0; query->nan_lo = 0; | |
| 1826 query->nns_hi = 0; query->nns_lo = 0; | |
| 1827 query->nar_hi = 0; query->nar_lo = 0; | |
| 1828 | |
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1829 p += sizeof(ngx_resolver_query_t) + nlen; |
| 1649 | 1830 |
| 1831 qs = (ngx_resolver_qs_t *) p; | |
| 1832 | |
| 1833 /* query type */ | |
| 1834 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type; | |
| 1835 | |
| 1836 /* IP query class */ | |
| 1837 qs->class_hi = 0; qs->class_lo = 1; | |
| 1838 | |
| 1839 /* convert "www.example.com" to "\3www\7example\3com\0" */ | |
| 1840 | |
| 1841 len = 0; | |
| 1842 p--; | |
| 1843 *p-- = '\0'; | |
| 1844 | |
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1845 if (ctx->name.len == 0) { |
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1846 return NGX_DECLINED; |
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1847 } |
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1848 |
| 1649 | 1849 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) { |
| 1850 if (*s != '.') { | |
| 1851 *p = *s; | |
| 1852 len++; | |
| 1853 | |
| 1854 } else { | |
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1855 if (len == 0 || len > 255) { |
|
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1856 return NGX_DECLINED; |
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1857 } |
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1858 |
| 1649 | 1859 *p = (u_char) len; |
| 1860 len = 0; | |
| 1861 } | |
| 1862 | |
| 1863 p--; | |
| 1864 } | |
| 1865 | |
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1866 if (len == 0 || len > 255) { |
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1867 return NGX_DECLINED; |
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1868 } |
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1869 |
| 1649 | 1870 *p = (u_char) len; |
| 1871 | |
| 1872 return NGX_OK; | |
| 1873 } | |
| 1874 | |
| 1875 | |
| 1876 /* AF_INET only */ | |
| 1877 | |
| 1878 static ngx_int_t | |
| 1879 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
| 1880 { | |
| 1881 u_char *p, *d; | |
| 1882 size_t len; | |
| 1883 ngx_int_t n; | |
| 1884 ngx_uint_t ident; | |
| 1885 ngx_resolver_query_t *query; | |
| 1886 | |
| 1887 len = sizeof(ngx_resolver_query_t) | |
| 1888 + sizeof(".255.255.255.255.in-addr.arpa.") - 1 | |
| 1889 + sizeof(ngx_resolver_qs_t); | |
| 1890 | |
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1891 p = ngx_resolver_alloc(ctx->resolver, len); |
| 1649 | 1892 if (p == NULL) { |
| 1893 return NGX_ERROR; | |
| 1894 } | |
| 1895 | |
| 1896 rn->query = p; | |
| 1897 query = (ngx_resolver_query_t *) p; | |
| 1898 | |
| 1899 ident = ngx_random(); | |
| 1900 | |
| 1901 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
| 1902 query->ident_lo = (u_char) (ident & 0xff); | |
| 1903 | |
| 1904 /* recursion query */ | |
| 1905 query->flags_hi = 1; query->flags_lo = 0; | |
| 1906 | |
| 1907 /* one question */ | |
| 1908 query->nqs_hi = 0; query->nqs_lo = 1; | |
| 1909 query->nan_hi = 0; query->nan_lo = 0; | |
| 1910 query->nns_hi = 0; query->nns_lo = 0; | |
| 1911 query->nar_hi = 0; query->nar_lo = 0; | |
| 1912 | |
| 1913 p += sizeof(ngx_resolver_query_t); | |
| 1914 | |
| 3642 | 1915 for (n = 0; n < 32; n += 8) { |
| 1649 | 1916 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff); |
| 1917 *p = (u_char) (d - &p[1]); | |
| 1918 p = d; | |
| 1919 } | |
| 1920 | |
| 1921 /* query type "PTR", IP query class */ | |
| 1922 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18); | |
| 1923 | |
| 1924 rn->qlen = (u_short) | |
| 1925 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t) | |
| 1926 - rn->query); | |
| 1927 | |
| 1928 return NGX_OK; | |
| 1929 } | |
| 1930 | |
| 1931 | |
| 1932 static ngx_int_t | |
| 1933 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src, | |
| 1934 u_char *last) | |
| 1935 { | |
| 1936 char *err; | |
| 1937 u_char *p, *dst; | |
| 1938 ssize_t len; | |
| 1939 ngx_uint_t i, n; | |
| 1940 | |
| 1941 p = src; | |
| 1942 len = -1; | |
| 1943 | |
| 1944 /* | |
| 1945 * compression pointers allow to create endless loop, so we set limit; | |
| 1946 * 128 pointers should be enough to store 255-byte name | |
| 1947 */ | |
| 1948 | |
| 1949 for (i = 0; i < 128; i++) { | |
| 1950 n = *p++; | |
| 1951 | |
| 1952 if (n == 0) { | |
| 1953 goto done; | |
| 1954 } | |
| 1955 | |
| 1956 if (n & 0xc0) { | |
|
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1957 n = ((n & 0x3f) << 8) + *p; |
| 1649 | 1958 p = &buf[n]; |
| 1959 | |
| 1960 } else { | |
| 1961 len += 1 + n; | |
| 1962 p = &p[n]; | |
| 1963 } | |
| 1964 | |
| 1965 if (p >= last) { | |
| 1966 err = "name is out of response"; | |
| 1967 goto invalid; | |
| 1968 } | |
| 1969 } | |
| 1970 | |
| 1971 err = "compression pointers loop"; | |
| 1972 | |
| 1973 invalid: | |
| 1974 | |
| 1975 ngx_log_error(r->log_level, r->log, 0, err); | |
| 1976 | |
| 1977 return NGX_ERROR; | |
| 1978 | |
| 1979 done: | |
| 1980 | |
| 1981 if (name == NULL) { | |
| 583 | 1982 return NGX_OK; |
| 1983 } | |
| 1984 | |
|
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1985 if (len == -1) { |
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1986 name->len = 0; |
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1987 name->data = NULL; |
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1988 return NGX_OK; |
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1989 } |
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1990 |
| 1649 | 1991 dst = ngx_resolver_alloc(r, len); |
| 1992 if (dst == NULL) { | |
| 1993 return NGX_ERROR; | |
| 1994 } | |
| 1995 | |
| 1996 name->data = dst; | |
| 1997 | |
| 1998 n = *src++; | |
| 1999 | |
| 2000 for ( ;; ) { | |
|
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2001 if (n & 0xc0) { |
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2002 n = ((n & 0x3f) << 8) + *src; |
|
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2003 src = &buf[n]; |
|
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|
2004 |
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2005 n = *src++; |
|
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|
2006 |
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|
2007 } else { |
| 1649 | 2008 ngx_memcpy(dst, src, n); |
| 2009 dst += n; | |
| 2010 src += n; | |
| 2011 | |
| 2012 n = *src++; | |
| 2013 | |
| 2014 if (n != 0) { | |
| 2015 *dst++ = '.'; | |
| 2016 } | |
| 2017 } | |
| 2018 | |
| 2019 if (n == 0) { | |
| 2020 name->len = dst - name->data; | |
| 2021 return NGX_OK; | |
| 2022 } | |
| 2023 } | |
| 2024 } | |
| 2025 | |
| 2026 | |
| 2027 static void | |
| 2028 ngx_resolver_timeout_handler(ngx_event_t *ev) | |
| 2029 { | |
| 2030 ngx_resolver_ctx_t *ctx; | |
| 2031 | |
| 2032 ctx = ev->data; | |
| 2033 | |
| 2034 ctx->state = NGX_RESOLVE_TIMEDOUT; | |
| 2035 | |
| 2036 ctx->handler(ctx); | |
| 2037 } | |
| 2038 | |
| 2039 | |
| 2040 static void | |
| 2041 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
| 2042 { | |
| 2043 /* lock alloc mutex */ | |
| 2044 | |
| 2045 if (rn->query) { | |
| 2046 ngx_resolver_free_locked(r, rn->query); | |
| 2047 } | |
| 2048 | |
| 2049 if (rn->name) { | |
| 2050 ngx_resolver_free_locked(r, rn->name); | |
| 2051 } | |
| 2052 | |
| 2053 if (rn->cnlen) { | |
| 2054 ngx_resolver_free_locked(r, rn->u.cname); | |
| 2055 } | |
| 2056 | |
| 2057 if (rn->naddrs > 1) { | |
| 2058 ngx_resolver_free_locked(r, rn->u.addrs); | |
| 2059 } | |
| 2060 | |
| 2061 ngx_resolver_free_locked(r, rn); | |
| 2062 | |
| 2063 /* unlock alloc mutex */ | |
| 2064 } | |
| 2065 | |
| 2066 | |
| 2067 static void * | |
| 2068 ngx_resolver_alloc(ngx_resolver_t *r, size_t size) | |
| 2069 { | |
| 2070 u_char *p; | |
| 2071 | |
| 2072 /* lock alloc mutex */ | |
| 2073 | |
| 2074 p = ngx_alloc(size, r->log); | |
| 2075 | |
| 2076 /* unlock alloc mutex */ | |
| 2077 | |
| 2078 return p; | |
| 2079 } | |
| 2080 | |
| 2081 | |
| 1903 | 2082 static void * |
| 1649 | 2083 ngx_resolver_calloc(ngx_resolver_t *r, size_t size) |
| 2084 { | |
| 2085 u_char *p; | |
| 2086 | |
| 2087 p = ngx_resolver_alloc(r, size); | |
| 2088 | |
| 2089 if (p) { | |
| 2090 ngx_memzero(p, size); | |
| 2091 } | |
| 2092 | |
| 2093 return p; | |
| 2094 } | |
| 2095 | |
| 2096 | |
| 2097 static void | |
| 2098 ngx_resolver_free(ngx_resolver_t *r, void *p) | |
| 2099 { | |
| 2100 /* lock alloc mutex */ | |
| 2101 | |
| 2102 ngx_free(p); | |
| 2103 | |
| 2104 /* unlock alloc mutex */ | |
| 2105 } | |
| 2106 | |
| 2107 | |
| 2108 static void | |
| 2109 ngx_resolver_free_locked(ngx_resolver_t *r, void *p) | |
| 2110 { | |
| 2111 ngx_free(p); | |
| 2112 } | |
| 2113 | |
| 2114 | |
| 2115 static void * | |
| 2116 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size) | |
| 2117 { | |
| 2118 void *dst; | |
| 2119 | |
| 2120 dst = ngx_resolver_alloc(r, size); | |
| 2121 | |
| 2122 if (dst == NULL) { | |
| 2123 return dst; | |
| 2124 } | |
| 2125 | |
| 2126 ngx_memcpy(dst, src, size); | |
| 2127 | |
| 2128 return dst; | |
| 2129 } | |
| 2130 | |
| 2131 | |
| 2132 char * | |
| 2133 ngx_resolver_strerror(ngx_int_t err) | |
| 2134 { | |
| 2135 static char *errors[] = { | |
| 2136 "Format error", /* FORMERR */ | |
| 2137 "Server failure", /* SERVFAIL */ | |
| 2138 "Host not found", /* NXDOMAIN */ | |
| 2139 "Unimplemented", /* NOTIMP */ | |
| 2140 "Operation refused" /* REFUSED */ | |
| 2141 }; | |
| 2142 | |
| 2143 if (err > 0 && err < 6) { | |
| 2144 return errors[err - 1]; | |
| 2145 } | |
| 2146 | |
| 2147 if (err == NGX_RESOLVE_TIMEDOUT) { | |
| 2148 return "Operation timed out"; | |
| 2149 } | |
| 2150 | |
| 2151 return "Unknown error"; | |
| 2152 } | |
| 2153 | |
| 2154 | |
|
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2155 static u_char * |
|
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2156 ngx_resolver_log_error(ngx_log_t *log, u_char *buf, size_t len) |
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2157 { |
|
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2158 u_char *p; |
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2159 ngx_udp_connection_t *uc; |
|
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|
2160 |
|
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|
2161 p = buf; |
|
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2162 |
|
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2163 if (log->action) { |
|
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2164 p = ngx_snprintf(buf, len, " while %s", log->action); |
|
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2165 len -= p - buf; |
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2166 } |
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2167 |
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2168 uc = log->data; |
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2169 |
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2170 if (uc) { |
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2171 p = ngx_snprintf(p, len, ", resolver: %V", &uc->server); |
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2172 } |
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2173 |
|
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2174 return p; |
|
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|
2175 } |
|
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2176 |
|
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2177 |
| 1649 | 2178 ngx_int_t |
| 2179 ngx_udp_connect(ngx_udp_connection_t *uc) | |
| 2180 { | |
| 2181 int rc; | |
| 2182 ngx_int_t event; | |
| 2183 ngx_event_t *rev, *wev; | |
| 2184 ngx_socket_t s; | |
| 2185 ngx_connection_t *c; | |
| 2186 | |
| 583 | 2187 s = ngx_socket(AF_INET, SOCK_DGRAM, 0); |
| 2188 | |
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2189 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, &uc->log, 0, "UDP socket %d", s); |
| 583 | 2190 |
| 2191 if (s == -1) { | |
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2192 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
| 583 | 2193 ngx_socket_n " failed"); |
| 2194 return NGX_ERROR; | |
| 2195 } | |
| 2196 | |
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2197 c = ngx_get_connection(s, &uc->log); |
| 583 | 2198 |
| 2199 if (c == NULL) { | |
| 2200 if (ngx_close_socket(s) == -1) { | |
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2201 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
| 583 | 2202 ngx_close_socket_n "failed"); |
| 2203 } | |
| 2204 | |
| 2205 return NGX_ERROR; | |
| 2206 } | |
| 2207 | |
| 1649 | 2208 if (ngx_nonblocking(s) == -1) { |
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2209 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
| 1649 | 2210 ngx_nonblocking_n " failed"); |
| 2211 | |
| 2212 ngx_free_connection(c); | |
| 2213 | |
| 2214 if (ngx_close_socket(s) == -1) { | |
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2215 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
| 1649 | 2216 ngx_close_socket_n " failed"); |
| 2217 } | |
| 2218 | |
| 2219 return NGX_ERROR; | |
| 2220 } | |
| 2221 | |
| 583 | 2222 rev = c->read; |
| 2223 wev = c->write; | |
| 2224 | |
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2225 rev->log = &uc->log; |
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2226 wev->log = &uc->log; |
| 1649 | 2227 |
| 2228 uc->connection = c; | |
| 583 | 2229 |
| 2230 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); | |
| 2231 | |
| 2232 #if (NGX_THREADS) | |
| 1649 | 2233 |
| 2234 /* TODO: lock event when call completion handler */ | |
| 2235 | |
| 2236 rev->lock = &c->lock; | |
| 2237 wev->lock = &c->lock; | |
| 583 | 2238 rev->own_lock = &c->lock; |
| 2239 wev->own_lock = &c->lock; | |
| 1649 | 2240 |
| 583 | 2241 #endif |
| 2242 | |
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2243 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, &uc->log, 0, |
| 1649 | 2244 "connect to %V, fd:%d #%d", &uc->server, s, c->number); |
| 2245 | |
| 2246 rc = connect(s, uc->sockaddr, uc->socklen); | |
| 2247 | |
| 2248 /* TODO: aio, iocp */ | |
| 583 | 2249 |
| 2250 if (rc == -1) { | |
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2251 ngx_log_error(NGX_LOG_CRIT, &uc->log, ngx_socket_errno, |
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2252 "connect() failed"); |
| 583 | 2253 |
| 2254 return NGX_ERROR; | |
| 2255 } | |
| 2256 | |
| 1649 | 2257 /* UDP sockets are always ready to write */ |
| 2258 wev->ready = 1; | |
| 2259 | |
| 2260 if (ngx_add_event) { | |
| 2261 | |
| 2262 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ? | |
| 2263 /* kqueue, epoll */ NGX_CLEAR_EVENT: | |
| 2264 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT; | |
| 2265 /* eventport event type has no meaning: oneshot only */ | |
| 2266 | |
| 2267 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { | |
| 2268 return NGX_ERROR; | |
| 2269 } | |
| 2270 | |
| 2271 } else { | |
| 2272 /* rtsig */ | |
| 2273 | |
| 583 | 2274 if (ngx_add_conn(c) == NGX_ERROR) { |
| 2275 return NGX_ERROR; | |
| 2276 } | |
| 2277 } | |
| 2278 | |
| 2279 return NGX_OK; | |
| 2280 } |