Mercurial > hg > nginx-quic
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) { | |
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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; |
1e0b028055ec
allow to use IP addresses without defined resolver
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parents:
1679
diff
changeset
|
284 } |
1e0b028055ec
allow to use IP addresses without defined resolver
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parents:
1679
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
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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
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1051 if (code == NGX_RESOLVE_FORMERR) { |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1052 |
ec97eb9a8038
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Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1053 times = 0; |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1054 |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1055 for (q = ngx_queue_head(&r->name_resend_queue); |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1056 q != ngx_queue_sentinel(&r->name_resend_queue) || times++ < 100; |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1057 q = ngx_queue_next(q)) |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1058 { |
ec97eb9a8038
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Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1059 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1060 qident = (rn->query[0] << 8) + rn->query[1]; |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1061 |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1062 if (qident == ident) { |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1063 ngx_log_error(r->log_level, r->log, 0, |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1064 "DNS error (%ui: %s), query id:%ui, name:\"%*s\"", |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1065 code, ngx_resolver_strerror(code), ident, |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1066 rn->nlen, rn->name); |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1067 return; |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1068 } |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1069 } |
ec97eb9a8038
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Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1070 |
ec97eb9a8038
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Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1071 goto dns_error; |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1072 } |
ec97eb9a8038
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Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
1073 |
ec97eb9a8038
show name for a FORMERR DNS response
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parents:
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diff
changeset
|
1074 if (code > NGX_RESOLVE_REFUSED) { |
ec97eb9a8038
show name for a FORMERR DNS response
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parents:
2281
diff
changeset
|
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, | |
1967
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use correct ngx_sprintf() formats
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diff
changeset
|
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
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use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
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>
parents:
1741
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:
1741
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
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
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
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1155 |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
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2281
diff
changeset
|
1156 dns_error: |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1157 |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
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2281
diff
changeset
|
1158 ngx_log_error(r->log_level, r->log, 0, |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
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2281
diff
changeset
|
1159 "DNS error (%ui: %s), query id:%ui", |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1160 code, ngx_resolver_strerror(code), ident); |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
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diff
changeset
|
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; | |
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
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
4a4b15c9c474
use correct ngx_sprintf() formats
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
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1212 } |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
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
05031fce7ce8
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.
Ruslan Ermilov <ru@nginx.com>
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:
4267
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.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
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
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
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; | |
3306
61bdaac6c668
fix resolving an empty name (".")
Igor Sysoev <igor@sysoev.ru>
parents:
3299
diff
changeset
|
1793 size_t len, nlen; |
1649 | 1794 ngx_uint_t ident; |
1795 ngx_resolver_qs_t *qs; | |
1796 ngx_resolver_query_t *query; | |
1797 | |
3306
61bdaac6c668
fix resolving an empty name (".")
Igor Sysoev <igor@sysoev.ru>
parents:
3299
diff
changeset
|
1798 nlen = ctx->name.len ? (1 + ctx->name.len + 1) : 1; |
61bdaac6c668
fix resolving an empty name (".")
Igor Sysoev <igor@sysoev.ru>
parents:
3299
diff
changeset
|
1799 |
61bdaac6c668
fix resolving an empty name (".")
Igor Sysoev <igor@sysoev.ru>
parents:
3299
diff
changeset
|
1800 len = sizeof(ngx_resolver_query_t) + nlen + sizeof(ngx_resolver_qs_t); |
1649 | 1801 |
3307
34e99a97fbd6
use ngx_resolver_alloc() instead of ngx_resolver_calloc()
Igor Sysoev <igor@sysoev.ru>
parents:
3306
diff
changeset
|
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 | |
3306
61bdaac6c668
fix resolving an empty name (".")
Igor Sysoev <igor@sysoev.ru>
parents:
3299
diff
changeset
|
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 | |
4610
778d2cc03e22
Fixed segmentation fault in ngx_resolver_create_name_query().
Ruslan Ermilov <ru@nginx.com>
parents:
4556
diff
changeset
|
1845 if (ctx->name.len == 0) { |
778d2cc03e22
Fixed segmentation fault in ngx_resolver_create_name_query().
Ruslan Ermilov <ru@nginx.com>
parents:
4556
diff
changeset
|
1846 return NGX_DECLINED; |
778d2cc03e22
Fixed segmentation fault in ngx_resolver_create_name_query().
Ruslan Ermilov <ru@nginx.com>
parents:
4556
diff
changeset
|
1847 } |
778d2cc03e22
Fixed segmentation fault in ngx_resolver_create_name_query().
Ruslan Ermilov <ru@nginx.com>
parents:
4556
diff
changeset
|
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 { | |
4556
1bddc91e78d6
Resolver: added missing sanity checking when creating name queries.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4497
diff
changeset
|
1855 if (len == 0 || len > 255) { |
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
1856 return NGX_DECLINED; |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
1857 } |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
1858 |
1649 | 1859 *p = (u_char) len; |
1860 len = 0; | |
1861 } | |
1862 | |
1863 p--; | |
1864 } | |
1865 | |
4556
1bddc91e78d6
Resolver: added missing sanity checking when creating name queries.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4497
diff
changeset
|
1866 if (len == 0 || len > 255) { |
1bddc91e78d6
Resolver: added missing sanity checking when creating name queries.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4497
diff
changeset
|
1867 return NGX_DECLINED; |
1bddc91e78d6
Resolver: added missing sanity checking when creating name queries.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4497
diff
changeset
|
1868 } |
1bddc91e78d6
Resolver: added missing sanity checking when creating name queries.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4497
diff
changeset
|
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 | |
3307
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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 ( ;; ) { | |
4267
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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 | |
3408
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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) { | |
3408
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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) { | |
3408
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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) { |
3408
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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) { | |
3408
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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 | |
3408
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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 | |
3408
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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) { | |
3408
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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 } |