Mercurial > hg > nginx-quic
annotate src/core/ngx_resolver.c @ 4610:778d2cc03e22
Fixed segmentation fault in ngx_resolver_create_name_query().
If name passed for resolution was { 0, NULL } (e.g. as a result
of name server returning CNAME pointing to ".") pointer wrapped
to (void *) -1 resulting in segmentation fault on an attempt to
dereference it.
Reported by Lanshun Zhou.
author | Ruslan Ermilov <ru@nginx.com> |
---|---|
date | Thu, 26 Apr 2012 12:58:42 +0000 |
parents | 1bddc91e78d6 |
children | 3171ec7d0d05 |
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, | |
1742
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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.
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diff
changeset
|
282 if (r->udp_connections.nelts == 0) { |
1683
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allow to use IP addresses without defined resolver
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parents:
1679
diff
changeset
|
283 return NGX_NO_RESOLVER; |
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allow to use IP addresses without defined resolver
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diff
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|
284 } |
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allow to use IP addresses without defined resolver
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|
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
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diff
changeset
|
326 /* NGX_ERROR */ |
1649 | 327 |
328 if (ctx->event) { | |
1904
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fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
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parents:
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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
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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
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parents:
1903
diff
changeset
|
393 /* lock alloc mutex */ |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
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parents:
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diff
changeset
|
394 |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
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parents:
1903
diff
changeset
|
395 if (ctx->event) { |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
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diff
changeset
|
396 ngx_resolver_free_locked(r, ctx->event); |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
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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:
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diff
changeset
|
399 ngx_resolver_free_locked(r, ctx); |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
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diff
changeset
|
400 |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
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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 | |
516 ngx_resolver_free_locked(r, rn->query); | |
1960
1609b3c3d604
fix memory leak on resolver query send failure
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parents:
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diff
changeset
|
517 rn->query = NULL; |
1649 | 518 |
519 if (rn->cnlen) { | |
520 ngx_resolver_free_locked(r, rn->u.cname); | |
521 } | |
522 | |
523 if (rn->naddrs > 1) { | |
524 ngx_resolver_free_locked(r, rn->u.addrs); | |
525 } | |
526 | |
527 /* unlock alloc mutex */ | |
528 | |
529 } else { | |
530 | |
531 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
532 if (rn == NULL) { | |
533 return NGX_ERROR; | |
534 } | |
535 | |
536 rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len); | |
537 if (rn->name == NULL) { | |
538 ngx_resolver_free(r, rn); | |
539 return NGX_ERROR; | |
540 } | |
541 | |
542 rn->node.key = hash; | |
543 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
|
544 rn->query = NULL; |
1649 | 545 |
546 ngx_rbtree_insert(&r->name_rbtree, &rn->node); | |
547 } | |
548 | |
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
549 rc = ngx_resolver_create_name_query(rn, ctx); |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
550 |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
551 if (rc == NGX_ERROR) { |
1649 | 552 goto failed; |
553 } | |
554 | |
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
555 if (rc == NGX_DECLINED) { |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
556 ngx_rbtree_delete(&r->name_rbtree, &rn->node); |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
557 |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
558 ngx_resolver_free(r, rn->query); |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
559 ngx_resolver_free(r, rn->name); |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
560 ngx_resolver_free(r, rn); |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
561 |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
562 ctx->state = NGX_RESOLVE_NXDOMAIN; |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
563 ctx->handler(ctx); |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
564 |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
565 return NGX_OK; |
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 |
1649 | 568 if (ngx_resolver_send_query(r, rn) != NGX_OK) { |
569 goto failed; | |
570 } | |
571 | |
572 if (ctx->event == NULL) { | |
573 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
574 if (ctx->event == NULL) { | |
575 goto failed; | |
576 } | |
577 | |
578 ctx->event->handler = ngx_resolver_timeout_handler; | |
579 ctx->event->data = ctx; | |
580 ctx->event->log = r->log; | |
581 ctx->ident = -1; | |
582 | |
583 ngx_add_timer(ctx->event, ctx->timeout); | |
584 } | |
585 | |
586 if (ngx_queue_empty(&r->name_resend_queue)) { | |
587 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
588 } | |
589 | |
590 rn->expire = ngx_time() + r->resend_timeout; | |
591 | |
592 ngx_queue_insert_head(&r->name_resend_queue, &rn->queue); | |
593 | |
594 rn->cnlen = 0; | |
595 rn->naddrs = 0; | |
596 rn->valid = 0; | |
597 rn->waiting = ctx; | |
598 | |
599 ctx->state = NGX_AGAIN; | |
600 | |
601 return NGX_AGAIN; | |
602 | |
603 failed: | |
604 | |
605 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
606 | |
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
607 if (rn->query) { |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
608 ngx_resolver_free(r, rn->query); |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
609 } |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
610 |
1649 | 611 ngx_resolver_free(r, rn->name); |
612 | |
613 ngx_resolver_free(r, rn); | |
614 | |
615 return NGX_ERROR; | |
616 } | |
583 | 617 |
618 | |
619 ngx_int_t | |
1649 | 620 ngx_resolve_addr(ngx_resolver_ctx_t *ctx) |
621 { | |
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
622 u_char *name; |
1649 | 623 ngx_resolver_t *r; |
624 ngx_resolver_node_t *rn; | |
625 | |
626 r = ctx->resolver; | |
627 | |
628 ctx->addr = ntohl(ctx->addr); | |
629 | |
630 /* lock addr mutex */ | |
631 | |
632 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
633 | |
634 if (rn) { | |
635 | |
636 if (rn->valid >= ngx_time()) { | |
637 | |
638 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
639 | |
640 ngx_queue_remove(&rn->queue); | |
641 | |
642 rn->expire = ngx_time() + r->expire; | |
643 | |
644 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
645 | |
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
646 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
|
647 if (name == NULL) { |
1649 | 648 goto failed; |
649 } | |
650 | |
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
651 ctx->name.len = rn->nlen; |
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
652 ctx->name.data = name; |
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
653 |
1649 | 654 /* unlock addr mutex */ |
655 | |
656 ctx->state = NGX_OK; | |
657 | |
658 ctx->handler(ctx); | |
659 | |
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
660 ngx_resolver_free(r, name); |
1649 | 661 |
662 return NGX_OK; | |
663 } | |
664 | |
665 if (rn->waiting) { | |
666 | |
667 ctx->next = rn->waiting; | |
668 rn->waiting = ctx; | |
3297 | 669 ctx->state = NGX_AGAIN; |
1649 | 670 |
2487
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
671 /* unlock addr mutex */ |
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
672 |
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
673 return NGX_OK; |
1649 | 674 } |
675 | |
676 ngx_queue_remove(&rn->queue); | |
677 | |
678 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
|
679 rn->query = NULL; |
1649 | 680 |
681 } else { | |
682 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
683 if (rn == NULL) { | |
684 goto failed; | |
685 } | |
686 | |
687 rn->node.key = ctx->addr; | |
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
688 rn->query = NULL; |
1649 | 689 |
690 ngx_rbtree_insert(&r->addr_rbtree, &rn->node); | |
691 } | |
692 | |
693 if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) { | |
694 goto failed; | |
695 } | |
696 | |
697 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
698 goto failed; | |
699 } | |
700 | |
701 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
702 if (ctx->event == NULL) { | |
703 goto failed; | |
704 } | |
705 | |
706 ctx->event->handler = ngx_resolver_timeout_handler; | |
707 ctx->event->data = ctx; | |
708 ctx->event->log = r->log; | |
709 ctx->ident = -1; | |
710 | |
711 ngx_add_timer(ctx->event, ctx->timeout); | |
712 | |
713 if (ngx_queue_empty(&r->addr_resend_queue)) { | |
714 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
715 } | |
716 | |
717 rn->expire = ngx_time() + r->resend_timeout; | |
718 | |
719 ngx_queue_insert_head(&r->addr_resend_queue, &rn->queue); | |
720 | |
721 rn->cnlen = 0; | |
722 rn->naddrs = 0; | |
723 rn->name = NULL; | |
724 rn->nlen = 0; | |
725 rn->valid = 0; | |
726 rn->waiting = ctx; | |
727 | |
728 /* unlock addr mutex */ | |
729 | |
730 ctx->state = NGX_AGAIN; | |
731 | |
732 return NGX_OK; | |
733 | |
734 failed: | |
735 | |
736 if (rn) { | |
737 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
738 | |
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
739 if (rn->query) { |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
740 ngx_resolver_free(r, rn->query); |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
741 } |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
742 |
1649 | 743 ngx_resolver_free(r, rn); |
744 } | |
745 | |
746 /* unlock addr mutex */ | |
747 | |
748 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
|
749 ngx_resolver_free(r, ctx->event); |
1649 | 750 } |
751 | |
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
752 ngx_resolver_free(r, ctx); |
1649 | 753 |
754 return NGX_ERROR; | |
755 } | |
756 | |
757 | |
758 void | |
759 ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx) | |
760 { | |
761 in_addr_t addr; | |
762 ngx_resolver_t *r; | |
763 ngx_resolver_ctx_t *w, **p; | |
764 ngx_resolver_node_t *rn; | |
765 | |
766 r = ctx->resolver; | |
767 | |
768 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
769 "resolve addr done: %i", ctx->state); | |
770 | |
771 if (ctx->event && ctx->event->timer_set) { | |
772 ngx_del_timer(ctx->event); | |
773 } | |
774 | |
775 /* lock addr mutex */ | |
776 | |
777 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
778 | |
779 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
780 | |
781 if (rn) { | |
782 p = &rn->waiting; | |
783 w = rn->waiting; | |
784 | |
785 while (w) { | |
786 if (w == ctx) { | |
787 *p = w->next; | |
788 | |
789 goto done; | |
790 } | |
791 | |
792 p = &w->next; | |
793 w = w->next; | |
794 } | |
795 } | |
796 | |
797 addr = ntohl(ctx->addr); | |
798 | |
799 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
800 "could not cancel %ud.%ud.%ud.%ud resolving", | |
801 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
802 (addr >> 8) & 0xff, addr & 0xff); | |
803 } | |
804 | |
805 done: | |
806 | |
807 ngx_resolver_expire(r, &r->addr_rbtree, &r->addr_expire_queue); | |
808 | |
809 /* unlock addr mutex */ | |
810 | |
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
811 /* 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
|
812 |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
813 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
|
814 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
|
815 } |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
816 |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
817 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
|
818 |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
819 /* unlock alloc mutex */ |
1649 | 820 } |
821 | |
822 | |
823 static void | |
824 ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
825 { | |
826 time_t now; | |
827 ngx_uint_t i; | |
828 ngx_queue_t *q; | |
829 ngx_resolver_node_t *rn; | |
830 | |
831 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire"); | |
832 | |
833 now = ngx_time(); | |
834 | |
835 for (i = 0; i < 2; i++) { | |
836 if (ngx_queue_empty(queue)) { | |
837 return; | |
838 } | |
839 | |
840 q = ngx_queue_last(queue); | |
841 | |
842 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
843 | |
844 if (now <= rn->expire) { | |
845 return; | |
846 } | |
847 | |
1774 | 848 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, |
849 "resolver expire \"%*s\"", (size_t) rn->nlen, rn->name); | |
1649 | 850 |
851 ngx_queue_remove(q); | |
852 | |
853 ngx_rbtree_delete(tree, &rn->node); | |
854 | |
855 ngx_resolver_free_node(r, rn); | |
856 } | |
857 } | |
858 | |
859 | |
860 static ngx_int_t | |
861 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
862 { | |
863 ssize_t n; | |
864 ngx_udp_connection_t *uc; | |
865 | |
4225
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
866 uc = r->udp_connections.elts; |
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
867 |
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
868 uc = &uc[r->last_connection++]; |
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
869 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
|
870 r->last_connection = 0; |
016352c19049
Support of several servers in the "resolver" directive.
Igor Sysoev <igor@sysoev.ru>
parents:
3902
diff
changeset
|
871 } |
1649 | 872 |
873 if (uc->connection == NULL) { | |
4496
be6c250b827b
Fixed null pointer dereference in resolver (ticket #91).
Maxim Dounin <mdounin@mdounin.ru>
parents:
4474
diff
changeset
|
874 |
be6c250b827b
Fixed null pointer dereference in resolver (ticket #91).
Maxim Dounin <mdounin@mdounin.ru>
parents:
4474
diff
changeset
|
875 uc->log = *r->log; |
be6c250b827b
Fixed null pointer dereference in resolver (ticket #91).
Maxim Dounin <mdounin@mdounin.ru>
parents:
4474
diff
changeset
|
876 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
|
877 uc->log.data = uc; |
be6c250b827b
Fixed null pointer dereference in resolver (ticket #91).
Maxim Dounin <mdounin@mdounin.ru>
parents:
4474
diff
changeset
|
878 uc->log.action = "resolving"; |
be6c250b827b
Fixed null pointer dereference in resolver (ticket #91).
Maxim Dounin <mdounin@mdounin.ru>
parents:
4474
diff
changeset
|
879 |
1649 | 880 if (ngx_udp_connect(uc) != NGX_OK) { |
881 return NGX_ERROR; | |
882 } | |
883 | |
884 uc->connection->data = r; | |
885 uc->connection->read->handler = ngx_resolver_read_response; | |
1906 | 886 uc->connection->read->resolver = 1; |
1649 | 887 } |
888 | |
889 n = ngx_send(uc->connection, rn->query, rn->qlen); | |
890 | |
891 if (n == -1) { | |
892 return NGX_ERROR; | |
893 } | |
894 | |
895 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
|
896 ngx_log_error(NGX_LOG_CRIT, &uc->log, 0, "send() incomplete"); |
1649 | 897 return NGX_ERROR; |
898 } | |
899 | |
900 return NGX_OK; | |
901 } | |
902 | |
903 | |
904 static void | |
905 ngx_resolver_resend_handler(ngx_event_t *ev) | |
906 { | |
907 time_t timer, atimer, ntimer; | |
908 ngx_resolver_t *r; | |
909 | |
910 r = ev->data; | |
911 | |
912 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, | |
913 "resolver resend handler"); | |
914 | |
915 /* lock name mutex */ | |
916 | |
917 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue); | |
918 | |
919 /* unlock name mutex */ | |
920 | |
921 /* lock addr mutex */ | |
922 | |
923 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
|
924 |
1649 | 925 /* unlock addr mutex */ |
926 | |
927 if (ntimer == 0) { | |
928 timer = atimer; | |
929 | |
930 } else if (atimer == 0) { | |
931 timer = ntimer; | |
932 | |
933 } else { | |
934 timer = (atimer < ntimer) ? atimer : ntimer; | |
935 } | |
936 | |
937 if (timer) { | |
938 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000)); | |
939 } | |
940 } | |
941 | |
942 | |
943 static time_t | |
944 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
945 { | |
946 time_t now; | |
947 ngx_queue_t *q; | |
948 ngx_resolver_node_t *rn; | |
949 | |
950 now = ngx_time(); | |
951 | |
952 for ( ;; ) { | |
953 if (ngx_queue_empty(queue)) { | |
954 return 0; | |
955 } | |
956 | |
957 q = ngx_queue_last(queue); | |
958 | |
959 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
960 | |
961 if (now < rn->expire) { | |
962 return rn->expire - now; | |
963 } | |
964 | |
1774 | 965 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, |
966 "resolver resend \"%*s\" %p", | |
967 (size_t) rn->nlen, rn->name, rn->waiting); | |
1649 | 968 |
969 ngx_queue_remove(q); | |
970 | |
971 if (rn->waiting) { | |
972 | |
973 if (ngx_resolver_send_query(r, rn) == NGX_OK) { | |
974 | |
975 rn->expire = now + r->resend_timeout; | |
976 | |
977 ngx_queue_insert_head(queue, &rn->queue); | |
978 } | |
1879
cf4ee321d195
do not delete failed DNS request if there are waiting clients
Igor Sysoev <igor@sysoev.ru>
parents:
1878
diff
changeset
|
979 |
cf4ee321d195
do not delete failed DNS request if there are waiting clients
Igor Sysoev <igor@sysoev.ru>
parents:
1878
diff
changeset
|
980 continue; |
1649 | 981 } |
982 | |
983 ngx_rbtree_delete(tree, &rn->node); | |
984 | |
985 ngx_resolver_free_node(r, rn); | |
986 } | |
987 } | |
988 | |
989 | |
990 static void | |
991 ngx_resolver_read_response(ngx_event_t *rev) | |
992 { | |
993 ssize_t n; | |
994 ngx_connection_t *c; | |
995 u_char buf[NGX_RESOLVER_UDP_SIZE]; | |
996 | |
997 c = rev->data; | |
998 | |
999 do { | |
1689 | 1000 n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE); |
1001 | |
1002 if (n < 0) { | |
1649 | 1003 return; |
1004 } | |
1005 | |
1006 ngx_resolver_process_response(c->data, buf, n); | |
1007 | |
1008 } while (rev->ready); | |
1009 } | |
1010 | |
1011 | |
1012 static void | |
1013 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n) | |
1014 { | |
1015 char *err; | |
1016 size_t len; | |
2282
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1017 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
|
1018 qtype, qclass; |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1019 ngx_queue_t *q; |
1649 | 1020 ngx_resolver_qs_t *qs; |
2282
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1021 ngx_resolver_node_t *rn; |
1649 | 1022 ngx_resolver_query_t *query; |
1023 | |
2281
5004229420a6
FORMERR DNS response may be equal to mininal query size
Igor Sysoev <igor@sysoev.ru>
parents:
2006
diff
changeset
|
1024 if ((size_t) n < sizeof(ngx_resolver_query_t)) { |
1649 | 1025 goto short_response; |
1026 } | |
1027 | |
1028 query = (ngx_resolver_query_t *) buf; | |
1029 | |
1030 ident = (query->ident_hi << 8) + query->ident_lo; | |
1031 flags = (query->flags_hi << 8) + query->flags_lo; | |
1032 nqs = (query->nqs_hi << 8) + query->nqs_lo; | |
1033 nan = (query->nan_hi << 8) + query->nan_lo; | |
1034 | |
1035 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
|
1036 "resolver DNS response %ui fl:%04Xui %ui/%ui/%ui/%ui", |
1649 | 1037 ident, flags, nqs, nan, |
1038 (query->nns_hi << 8) + query->nns_lo, | |
1039 (query->nar_hi << 8) + query->nar_lo); | |
1040 | |
1041 if (!(flags & 0x8000)) { | |
1042 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
|
1043 "invalid DNS response %ui fl:%04Xui", ident, flags); |
1649 | 1044 return; |
1045 } | |
1046 | |
1047 code = flags & 0x7f; | |
1048 | |
2282
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1049 if (code == NGX_RESOLVE_FORMERR) { |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1050 |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1051 times = 0; |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1052 |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1053 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
|
1054 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
|
1055 q = ngx_queue_next(q)) |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1056 { |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1057 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
|
1058 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
|
1059 |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1060 if (qident == ident) { |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1061 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
|
1062 "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
|
1063 code, ngx_resolver_strerror(code), ident, |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1064 rn->nlen, rn->name); |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1065 return; |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1066 } |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1067 } |
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 goto dns_error; |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1070 } |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1071 |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1072 if (code > NGX_RESOLVE_REFUSED) { |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1073 goto dns_error; |
1649 | 1074 } |
1075 | |
1076 if (nqs != 1) { | |
1077 err = "invalid number of questions in DNS response"; | |
1078 goto done; | |
1079 } | |
1080 | |
1081 i = sizeof(ngx_resolver_query_t); | |
1082 | |
1083 while (i < (ngx_uint_t) n) { | |
1084 if (buf[i] == '\0') { | |
1085 goto found; | |
1086 } | |
1087 | |
1088 len = buf[i]; | |
1089 i += 1 + len; | |
1090 } | |
1091 | |
1092 goto short_response; | |
1093 | |
1094 found: | |
1095 | |
1096 if (i++ == 0) { | |
1097 err = "zero-length domain name in DNS response"; | |
1098 goto done; | |
1099 } | |
1100 | |
1101 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t)) | |
1102 > (ngx_uint_t) n) | |
1103 { | |
1104 goto short_response; | |
1105 } | |
1106 | |
1107 qs = (ngx_resolver_qs_t *) &buf[i]; | |
1108 | |
1109 qtype = (qs->type_hi << 8) + qs->type_lo; | |
1110 qclass = (qs->class_hi << 8) + qs->class_lo; | |
1111 | |
1112 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1967
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parents:
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diff
changeset
|
1113 "resolver DNS response qt:%ui cl:%ui", qtype, qclass); |
1649 | 1114 |
1115 if (qclass != 1) { | |
1116 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
|
1117 "unknown query class %ui in DNS response", qclass); |
1649 | 1118 return; |
1119 } | |
1120 | |
1121 switch (qtype) { | |
1122 | |
1123 case NGX_RESOLVE_A: | |
1124 | |
1125 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
|
1126 i + sizeof(ngx_resolver_qs_t)); |
1649 | 1127 |
1128 break; | |
1129 | |
1130 case NGX_RESOLVE_PTR: | |
1131 | |
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
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parents:
1741
diff
changeset
|
1132 ngx_resolver_process_ptr(r, buf, n, ident, code, nan); |
1649 | 1133 |
1134 break; | |
1135 | |
1136 default: | |
1137 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
|
1138 "unknown query type %ui in DNS response", qtype); |
1649 | 1139 return; |
1140 } | |
1141 | |
1142 return; | |
1143 | |
1144 short_response: | |
1145 | |
1146 err = "short dns response"; | |
1147 | |
1148 done: | |
1149 | |
1150 ngx_log_error(r->log_level, r->log, 0, err); | |
1151 | |
1152 return; | |
2282
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1153 |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1154 dns_error: |
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>
parents:
2281
diff
changeset
|
1156 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
|
1157 "DNS error (%ui: %s), query id:%ui", |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1158 code, ngx_resolver_strerror(code), ident); |
ec97eb9a8038
show name for a FORMERR DNS response
Igor Sysoev <igor@sysoev.ru>
parents:
2281
diff
changeset
|
1159 return; |
1649 | 1160 } |
1161 | |
1162 | |
1163 static void | |
1164 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last, | |
1165 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans) | |
583 | 1166 { |
1649 | 1167 char *err; |
1168 u_char *cname; | |
1169 size_t len; | |
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
1170 int32_t ttl; |
1649 | 1171 uint32_t hash; |
1172 in_addr_t addr, *addrs; | |
1173 ngx_str_t name; | |
1174 ngx_uint_t qtype, qident, naddrs, a, i, n, start; | |
1175 ngx_resolver_an_t *an; | |
1176 ngx_resolver_ctx_t *ctx, *next; | |
1177 ngx_resolver_node_t *rn; | |
1178 | |
1179 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) { | |
1180 return; | |
1181 } | |
1182 | |
1183 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); | |
1184 | |
1185 hash = ngx_crc32_short(name.data, name.len); | |
1186 | |
1187 /* lock name mutex */ | |
1188 | |
1189 rn = ngx_resolver_lookup_name(r, &name, hash); | |
1190 | |
1191 if (rn == NULL || rn->query == NULL) { | |
1192 ngx_log_error(r->log_level, r->log, 0, | |
1193 "unexpected response for %V", &name); | |
1194 goto failed; | |
1195 } | |
1196 | |
1197 qident = (rn->query[0] << 8) + rn->query[1]; | |
1198 | |
1199 if (ident != qident) { | |
1200 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
|
1201 "wrong ident %ui response for %V, expect %ui", |
1649 | 1202 ident, &name, qident); |
1203 goto failed; | |
1204 } | |
1205 | |
3139 | 1206 ngx_resolver_free(r, name.data); |
1207 | |
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1208 if (code == 0 && nan == 0) { |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1209 code = 3; /* NXDOMAIN */ |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1210 } |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1211 |
1649 | 1212 if (code) { |
1213 next = rn->waiting; | |
1214 rn->waiting = NULL; | |
1215 | |
1216 ngx_queue_remove(&rn->queue); | |
1217 | |
1218 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
1219 | |
1220 ngx_resolver_free_node(r, rn); | |
1221 | |
1222 /* unlock name mutex */ | |
1223 | |
1224 while (next) { | |
1225 ctx = next; | |
1226 ctx->state = code; | |
1227 next = ctx->next; | |
1228 | |
1229 ctx->handler(ctx); | |
1230 } | |
1231 | |
1232 return; | |
1233 } | |
1234 | |
1235 i = ans; | |
1236 naddrs = 0; | |
1237 addr = 0; | |
1238 addrs = NULL; | |
1239 cname = NULL; | |
1240 qtype = 0; | |
4296
783fd9c38d98
Silenced a warning for some compilers.
Ruslan Ermilov <ru@nginx.com>
parents:
4295
diff
changeset
|
1241 ttl = 0; |
1649 | 1242 |
1243 for (a = 0; a < nan; a++) { | |
1244 | |
1245 start = i; | |
1246 | |
1247 while (i < last) { | |
1248 | |
1249 if (buf[i] & 0xc0) { | |
1250 i += 2; | |
1251 goto found; | |
1252 } | |
1253 | |
1254 if (buf[i] == 0) { | |
1255 i++; | |
1256 goto test_length; | |
1257 } | |
1258 | |
1259 i += 1 + buf[i]; | |
1260 } | |
1261 | |
1262 goto short_response; | |
1263 | |
1264 test_length: | |
1265 | |
1266 if (i - start < 2) { | |
1267 err = "invalid name in dns response"; | |
1268 goto invalid; | |
1269 } | |
1270 | |
1271 found: | |
1272 | |
1273 if (i + sizeof(ngx_resolver_an_t) >= last) { | |
1274 goto short_response; | |
1275 } | |
1276 | |
1277 an = (ngx_resolver_an_t *) &buf[i]; | |
1278 | |
1279 qtype = (an->type_hi << 8) + an->type_lo; | |
1280 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
|
1281 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
|
1282 + (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
|
1283 |
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1284 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
|
1285 ttl = 0; |
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1286 } |
1649 | 1287 |
1288 if (qtype == NGX_RESOLVE_A) { | |
1289 | |
1290 i += sizeof(ngx_resolver_an_t); | |
1291 | |
1292 if (i + len > last) { | |
1293 goto short_response; | |
1294 } | |
1295 | |
1296 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
1297 + (buf[i + 2] << 8) + (buf[i + 3])); | |
1298 | |
1299 naddrs++; | |
1300 | |
1301 i += len; | |
1302 | |
1303 } else if (qtype == NGX_RESOLVE_CNAME) { | |
1304 cname = &buf[i] + sizeof(ngx_resolver_an_t); | |
1305 i += sizeof(ngx_resolver_an_t) + len; | |
1965 | 1306 |
1307 } else if (qtype == NGX_RESOLVE_DNAME) { | |
1308 i += sizeof(ngx_resolver_an_t) + len; | |
1966 | 1309 |
1310 } else { | |
1311 ngx_log_error(r->log_level, r->log, 0, | |
1312 "unexpected qtype %ui", qtype); | |
1649 | 1313 } |
1314 } | |
1315 | |
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1316 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
|
1317 "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
|
1318 naddrs, cname, ttl); |
1649 | 1319 |
1320 if (naddrs) { | |
1321 | |
1322 if (naddrs == 1) { | |
1323 rn->u.addr = addr; | |
1324 | |
1325 } else { | |
1326 | |
1327 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t)); | |
1328 if (addrs == NULL) { | |
1329 return; | |
1330 } | |
1331 | |
1332 n = 0; | |
1333 i = ans; | |
1334 | |
1335 for (a = 0; a < nan; a++) { | |
1336 | |
1337 for ( ;; ) { | |
1338 | |
1339 if (buf[i] & 0xc0) { | |
1340 i += 2; | |
1341 goto ok; | |
1342 } | |
1343 | |
1344 if (buf[i] == 0) { | |
1345 i++; | |
1346 goto ok; | |
1347 } | |
1348 | |
1349 i += 1 + buf[i]; | |
1350 } | |
1351 | |
1352 ok: | |
1353 | |
1354 an = (ngx_resolver_an_t *) &buf[i]; | |
1355 | |
1356 qtype = (an->type_hi << 8) + an->type_lo; | |
1357 len = (an->len_hi << 8) + an->len_lo; | |
1358 | |
1359 i += sizeof(ngx_resolver_an_t); | |
1360 | |
1361 if (qtype == NGX_RESOLVE_A) { | |
1362 | |
1363 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
1364 + (buf[i + 2] << 8) + (buf[i + 3])); | |
1365 | |
1366 if (n == naddrs) { | |
1367 break; | |
1368 } | |
1369 } | |
1370 | |
1371 i += len; | |
1372 } | |
1373 | |
1374 rn->u.addrs = addrs; | |
1375 | |
1376 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
1377 naddrs * sizeof(in_addr_t)); | |
1378 if (addrs == NULL) { | |
1379 return; | |
1380 } | |
1381 } | |
1382 | |
1383 rn->naddrs = (u_short) naddrs; | |
1384 | |
1385 ngx_queue_remove(&rn->queue); | |
1386 | |
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1387 rn->valid = ngx_time() + (r->valid ? r->valid : ttl); |
1649 | 1388 rn->expire = ngx_time() + r->expire; |
1389 | |
1390 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
1391 | |
1392 next = rn->waiting; | |
1393 rn->waiting = NULL; | |
1394 | |
1395 /* unlock name mutex */ | |
1396 | |
1397 while (next) { | |
1398 ctx = next; | |
1399 ctx->state = NGX_OK; | |
1400 ctx->naddrs = naddrs; | |
1401 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
1402 ctx->addr = addr; | |
1403 next = ctx->next; | |
1404 | |
1405 ctx->handler(ctx); | |
1406 } | |
1407 | |
2483
29494780d978
free addrs only it has been allocated before: non single address
Igor Sysoev <igor@sysoev.ru>
parents:
2482
diff
changeset
|
1408 if (naddrs > 1) { |
1649 | 1409 ngx_resolver_free(r, addrs); |
1410 } | |
1411 | |
1412 return; | |
1413 | |
1414 } else if (cname) { | |
1415 | |
1416 /* CNAME only */ | |
1417 | |
1418 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) { | |
1419 return; | |
1420 } | |
1421 | |
1422 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1423 "resolver cname:\"%V\"", &name); | |
1424 | |
1741
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1425 ngx_queue_remove(&rn->queue); |
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1426 |
1649 | 1427 rn->cnlen = (u_short) name.len; |
1428 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
|
1429 |
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1430 rn->valid = ngx_time() + (r->valid ? r->valid : ttl); |
1649 | 1431 rn->expire = ngx_time() + r->expire; |
1432 | |
1433 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
1434 | |
1435 ctx = rn->waiting; | |
1436 rn->waiting = NULL; | |
1437 | |
1438 if (ctx) { | |
1439 ctx->name = name; | |
1440 | |
1441 (void) ngx_resolve_name_locked(r, ctx); | |
1442 } | |
1443 | |
1444 return; | |
1445 } | |
1446 | |
1447 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
|
1448 "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
|
1449 qtype); |
1649 | 1450 return; |
1451 | |
1452 short_response: | |
1453 | |
1454 err = "short dns response"; | |
1455 | |
1456 invalid: | |
1457 | |
1458 /* unlock name mutex */ | |
1459 | |
1460 ngx_log_error(r->log_level, r->log, 0, err); | |
1461 | |
1462 return; | |
1463 | |
1464 failed: | |
1465 | |
1466 /* unlock name mutex */ | |
1467 | |
3139 | 1468 ngx_resolver_free(r, name.data); |
1469 | |
1649 | 1470 return; |
1471 } | |
1472 | |
1473 | |
1474 static void | |
1475 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
|
1476 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan) |
1649 | 1477 { |
1478 char *err; | |
1479 size_t len; | |
1480 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
|
1481 int32_t ttl; |
1649 | 1482 ngx_int_t digit; |
1483 ngx_str_t name; | |
3902
159b58f9c0bd
fix building by gcc 4.6 without --with-debug
Igor Sysoev <igor@sysoev.ru>
parents:
3763
diff
changeset
|
1484 ngx_uint_t i, mask, qident; |
1649 | 1485 ngx_resolver_an_t *an; |
1486 ngx_resolver_ctx_t *ctx, *next; | |
1487 ngx_resolver_node_t *rn; | |
1488 | |
1489 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) { | |
1490 goto invalid_in_addr_arpa; | |
1491 } | |
1492 | |
1493 addr = 0; | |
1494 i = 12; | |
1495 | |
1496 for (mask = 0; mask < 32; mask += 8) { | |
1497 len = buf[i++]; | |
1498 | |
1499 digit = ngx_atoi(&buf[i], len); | |
1500 if (digit == NGX_ERROR || digit > 255) { | |
1501 goto invalid_in_addr_arpa; | |
1502 } | |
1503 | |
1504 addr += digit << mask; | |
1505 i += len; | |
1506 } | |
1507 | |
1508 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) { | |
1509 goto invalid_in_addr_arpa; | |
1510 } | |
1511 | |
1512 /* lock addr mutex */ | |
1513 | |
1514 rn = ngx_resolver_lookup_addr(r, addr); | |
1515 | |
1516 if (rn == NULL || rn->query == NULL) { | |
1517 ngx_log_error(r->log_level, r->log, 0, | |
1518 "unexpected response for %ud.%ud.%ud.%ud", | |
1519 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
1520 (addr >> 8) & 0xff, addr & 0xff); | |
1521 goto failed; | |
1522 } | |
1523 | |
1524 qident = (rn->query[0] << 8) + rn->query[1]; | |
1525 | |
1526 if (ident != qident) { | |
1527 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
|
1528 "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
|
1529 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff, |
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1530 (addr >> 8) & 0xff, addr & 0xff, qident); |
1649 | 1531 goto failed; |
1532 } | |
1533 | |
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1534 if (code == 0 && nan == 0) { |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1535 code = 3; /* NXDOMAIN */ |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1536 } |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1537 |
1649 | 1538 if (code) { |
1539 next = rn->waiting; | |
1540 rn->waiting = NULL; | |
1541 | |
1542 ngx_queue_remove(&rn->queue); | |
1543 | |
1544 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
1545 | |
1546 ngx_resolver_free_node(r, rn); | |
1547 | |
1548 /* unlock addr mutex */ | |
1549 | |
1550 while (next) { | |
1551 ctx = next; | |
1552 ctx->state = code; | |
1553 next = ctx->next; | |
1554 | |
1555 ctx->handler(ctx); | |
1556 } | |
1557 | |
1558 return; | |
1559 } | |
1560 | |
1561 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t); | |
1562 | |
1563 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) { | |
1564 goto short_response; | |
1565 } | |
1566 | |
1567 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */ | |
1568 | |
1569 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) { | |
1570 err = "invalid in-addr.arpa name in DNS response"; | |
1571 goto invalid; | |
1572 } | |
1573 | |
1574 an = (ngx_resolver_an_t *) &buf[i + 2]; | |
1575 | |
1576 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
|
1577 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
|
1578 + (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
|
1579 |
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1580 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
|
1581 ttl = 0; |
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1582 } |
1649 | 1583 |
1584 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
|
1585 "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
|
1586 (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
|
1587 (an->class_hi << 8) + an->class_lo, len); |
1649 | 1588 |
1589 i += 2 + sizeof(ngx_resolver_an_t); | |
1590 | |
1591 if (i + len > (ngx_uint_t) n) { | |
1592 goto short_response; | |
1593 } | |
1594 | |
1595 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) { | |
1596 return; | |
1597 } | |
1598 | |
1599 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name); | |
1600 | |
2486
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1601 if (name.len != (size_t) rn->nlen |
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1602 || ngx_strncmp(name.data, rn->name, name.len) != 0) |
1649 | 1603 { |
2482
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1604 if (rn->nlen) { |
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1605 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
|
1606 } |
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1607 |
2490
1c87647b7ca5
fix building by msvc, introduced in r2487
Igor Sysoev <igor@sysoev.ru>
parents:
2487
diff
changeset
|
1608 rn->nlen = (u_short) name.len; |
1649 | 1609 rn->name = name.data; |
1610 | |
2486
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1611 name.data = ngx_resolver_dup(r, rn->name, name.len); |
1649 | 1612 if (name.data == NULL) { |
1613 goto failed; | |
1614 } | |
1615 } | |
1616 | |
1617 ngx_queue_remove(&rn->queue); | |
1618 | |
4295
05031fce7ce8
Now nginx uses TTL of a DNS response when calculating cache validity.
Ruslan Ermilov <ru@nginx.com>
parents:
4267
diff
changeset
|
1619 rn->valid = ngx_time() + (r->valid ? r->valid : ttl); |
1649 | 1620 rn->expire = ngx_time() + r->expire; |
1621 | |
1622 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
1623 | |
1624 next = rn->waiting; | |
1625 rn->waiting = NULL; | |
1626 | |
1627 /* unlock addr mutex */ | |
1628 | |
1629 while (next) { | |
1630 ctx = next; | |
1631 ctx->state = NGX_OK; | |
1632 ctx->name = name; | |
1633 next = ctx->next; | |
1634 | |
1635 ctx->handler(ctx); | |
1636 } | |
1637 | |
1638 ngx_resolver_free(r, name.data); | |
1639 | |
1640 return; | |
1641 | |
1642 invalid_in_addr_arpa: | |
1643 | |
1644 ngx_log_error(r->log_level, r->log, 0, | |
1645 "invalid in-addr.arpa name in DNS response"); | |
1646 return; | |
1647 | |
1648 short_response: | |
1649 | |
1650 err = "short DNS response"; | |
1651 | |
1652 invalid: | |
1653 | |
1654 /* unlock addr mutex */ | |
1655 | |
1656 ngx_log_error(r->log_level, r->log, 0, err); | |
1657 | |
1658 return; | |
1659 | |
1660 failed: | |
1661 | |
1662 /* unlock addr mutex */ | |
1663 | |
1664 return; | |
1665 } | |
1666 | |
1667 | |
1668 static ngx_resolver_node_t * | |
1669 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) | |
1670 { | |
1671 ngx_int_t rc; | |
1672 ngx_rbtree_node_t *node, *sentinel; | |
1673 ngx_resolver_node_t *rn; | |
1674 | |
1675 node = r->name_rbtree.root; | |
1676 sentinel = r->name_rbtree.sentinel; | |
1677 | |
1678 while (node != sentinel) { | |
1679 | |
1680 if (hash < node->key) { | |
1681 node = node->left; | |
1682 continue; | |
1683 } | |
1684 | |
1685 if (hash > node->key) { | |
1686 node = node->right; | |
1687 continue; | |
1688 } | |
1689 | |
1690 /* hash == node->key */ | |
1691 | |
4497
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1692 rn = (ngx_resolver_node_t *) node; |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1693 |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1694 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
|
1695 |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1696 if (rc == 0) { |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1697 return rn; |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1698 } |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1699 |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4496
diff
changeset
|
1700 node = (rc < 0) ? node->left : node->right; |
1649 | 1701 } |
1702 | |
1703 /* not found */ | |
1704 | |
1705 return NULL; | |
1706 } | |
1707 | |
1708 | |
1709 static ngx_resolver_node_t * | |
1710 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr) | |
1711 { | |
1712 ngx_rbtree_node_t *node, *sentinel; | |
1713 | |
1714 node = r->addr_rbtree.root; | |
1715 sentinel = r->addr_rbtree.sentinel; | |
1716 | |
1717 while (node != sentinel) { | |
1718 | |
1719 if (addr < node->key) { | |
1720 node = node->left; | |
1721 continue; | |
1722 } | |
1723 | |
1724 if (addr > node->key) { | |
1725 node = node->right; | |
1726 continue; | |
1727 } | |
1728 | |
1729 /* addr == node->key */ | |
1730 | |
1731 return (ngx_resolver_node_t *) node; | |
1732 } | |
1733 | |
1734 /* not found */ | |
1735 | |
1736 return NULL; | |
1737 } | |
1738 | |
1739 | |
1740 static void | |
1741 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
1742 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
1743 { | |
1744 ngx_rbtree_node_t **p; | |
1745 ngx_resolver_node_t *rn, *rn_temp; | |
1746 | |
1747 for ( ;; ) { | |
1748 | |
1749 if (node->key < temp->key) { | |
1750 | |
1751 p = &temp->left; | |
1752 | |
1753 } else if (node->key > temp->key) { | |
1754 | |
1755 p = &temp->right; | |
1756 | |
1757 } else { /* node->key == temp->key */ | |
1758 | |
1759 rn = (ngx_resolver_node_t *) node; | |
1760 rn_temp = (ngx_resolver_node_t *) temp; | |
1761 | |
3143
ab6258e18099
fix resolver cache rbtree comparison
Igor Sysoev <igor@sysoev.ru>
parents:
3139
diff
changeset
|
1762 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
|
1763 < 0) ? &temp->left : &temp->right; |
1649 | 1764 } |
1765 | |
1766 if (*p == sentinel) { | |
1767 break; | |
1768 } | |
1769 | |
1770 temp = *p; | |
1771 } | |
1772 | |
1773 *p = node; | |
1774 node->parent = temp; | |
1775 node->left = sentinel; | |
1776 node->right = sentinel; | |
1777 ngx_rbt_red(node); | |
1778 } | |
1779 | |
1780 | |
1781 static ngx_int_t | |
1782 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
1783 { | |
1784 u_char *p, *s; | |
3306
61bdaac6c668
fix resolving an empty name (".")
Igor Sysoev <igor@sysoev.ru>
parents:
3299
diff
changeset
|
1785 size_t len, nlen; |
1649 | 1786 ngx_uint_t ident; |
1787 ngx_resolver_qs_t *qs; | |
1788 ngx_resolver_query_t *query; | |
1789 | |
3306
61bdaac6c668
fix resolving an empty name (".")
Igor Sysoev <igor@sysoev.ru>
parents:
3299
diff
changeset
|
1790 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
|
1791 |
61bdaac6c668
fix resolving an empty name (".")
Igor Sysoev <igor@sysoev.ru>
parents:
3299
diff
changeset
|
1792 len = sizeof(ngx_resolver_query_t) + nlen + sizeof(ngx_resolver_qs_t); |
1649 | 1793 |
3307
34e99a97fbd6
use ngx_resolver_alloc() instead of ngx_resolver_calloc()
Igor Sysoev <igor@sysoev.ru>
parents:
3306
diff
changeset
|
1794 p = ngx_resolver_alloc(ctx->resolver, len); |
1649 | 1795 if (p == NULL) { |
1796 return NGX_ERROR; | |
1797 } | |
1798 | |
1799 rn->qlen = (u_short) len; | |
1800 rn->query = p; | |
1801 | |
1802 query = (ngx_resolver_query_t *) p; | |
1803 | |
1804 ident = ngx_random(); | |
1805 | |
1806 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0, | |
1807 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff); | |
1808 | |
1809 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
1810 query->ident_lo = (u_char) (ident & 0xff); | |
1811 | |
1812 /* recursion query */ | |
1813 query->flags_hi = 1; query->flags_lo = 0; | |
1814 | |
1815 /* one question */ | |
1816 query->nqs_hi = 0; query->nqs_lo = 1; | |
1817 query->nan_hi = 0; query->nan_lo = 0; | |
1818 query->nns_hi = 0; query->nns_lo = 0; | |
1819 query->nar_hi = 0; query->nar_lo = 0; | |
1820 | |
3306
61bdaac6c668
fix resolving an empty name (".")
Igor Sysoev <igor@sysoev.ru>
parents:
3299
diff
changeset
|
1821 p += sizeof(ngx_resolver_query_t) + nlen; |
1649 | 1822 |
1823 qs = (ngx_resolver_qs_t *) p; | |
1824 | |
1825 /* query type */ | |
1826 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type; | |
1827 | |
1828 /* IP query class */ | |
1829 qs->class_hi = 0; qs->class_lo = 1; | |
1830 | |
1831 /* convert "www.example.com" to "\3www\7example\3com\0" */ | |
1832 | |
1833 len = 0; | |
1834 p--; | |
1835 *p-- = '\0'; | |
1836 | |
4610
778d2cc03e22
Fixed segmentation fault in ngx_resolver_create_name_query().
Ruslan Ermilov <ru@nginx.com>
parents:
4556
diff
changeset
|
1837 if (ctx->name.len == 0) { |
778d2cc03e22
Fixed segmentation fault in ngx_resolver_create_name_query().
Ruslan Ermilov <ru@nginx.com>
parents:
4556
diff
changeset
|
1838 return NGX_DECLINED; |
778d2cc03e22
Fixed segmentation fault in ngx_resolver_create_name_query().
Ruslan Ermilov <ru@nginx.com>
parents:
4556
diff
changeset
|
1839 } |
778d2cc03e22
Fixed segmentation fault in ngx_resolver_create_name_query().
Ruslan Ermilov <ru@nginx.com>
parents:
4556
diff
changeset
|
1840 |
1649 | 1841 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) { |
1842 if (*s != '.') { | |
1843 *p = *s; | |
1844 len++; | |
1845 | |
1846 } else { | |
4556
1bddc91e78d6
Resolver: added missing sanity checking when creating name queries.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4497
diff
changeset
|
1847 if (len == 0 || len > 255) { |
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
1848 return NGX_DECLINED; |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
1849 } |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
1850 |
1649 | 1851 *p = (u_char) len; |
1852 len = 0; | |
1853 } | |
1854 | |
1855 p--; | |
1856 } | |
1857 | |
4556
1bddc91e78d6
Resolver: added missing sanity checking when creating name queries.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4497
diff
changeset
|
1858 if (len == 0 || len > 255) { |
1bddc91e78d6
Resolver: added missing sanity checking when creating name queries.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4497
diff
changeset
|
1859 return NGX_DECLINED; |
1bddc91e78d6
Resolver: added missing sanity checking when creating name queries.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4497
diff
changeset
|
1860 } |
1bddc91e78d6
Resolver: added missing sanity checking when creating name queries.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4497
diff
changeset
|
1861 |
1649 | 1862 *p = (u_char) len; |
1863 | |
1864 return NGX_OK; | |
1865 } | |
1866 | |
1867 | |
1868 /* AF_INET only */ | |
1869 | |
1870 static ngx_int_t | |
1871 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
1872 { | |
1873 u_char *p, *d; | |
1874 size_t len; | |
1875 ngx_int_t n; | |
1876 ngx_uint_t ident; | |
1877 ngx_resolver_query_t *query; | |
1878 | |
1879 len = sizeof(ngx_resolver_query_t) | |
1880 + sizeof(".255.255.255.255.in-addr.arpa.") - 1 | |
1881 + sizeof(ngx_resolver_qs_t); | |
1882 | |
3307
34e99a97fbd6
use ngx_resolver_alloc() instead of ngx_resolver_calloc()
Igor Sysoev <igor@sysoev.ru>
parents:
3306
diff
changeset
|
1883 p = ngx_resolver_alloc(ctx->resolver, len); |
1649 | 1884 if (p == NULL) { |
1885 return NGX_ERROR; | |
1886 } | |
1887 | |
1888 rn->query = p; | |
1889 query = (ngx_resolver_query_t *) p; | |
1890 | |
1891 ident = ngx_random(); | |
1892 | |
1893 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
1894 query->ident_lo = (u_char) (ident & 0xff); | |
1895 | |
1896 /* recursion query */ | |
1897 query->flags_hi = 1; query->flags_lo = 0; | |
1898 | |
1899 /* one question */ | |
1900 query->nqs_hi = 0; query->nqs_lo = 1; | |
1901 query->nan_hi = 0; query->nan_lo = 0; | |
1902 query->nns_hi = 0; query->nns_lo = 0; | |
1903 query->nar_hi = 0; query->nar_lo = 0; | |
1904 | |
1905 p += sizeof(ngx_resolver_query_t); | |
1906 | |
3642 | 1907 for (n = 0; n < 32; n += 8) { |
1649 | 1908 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff); |
1909 *p = (u_char) (d - &p[1]); | |
1910 p = d; | |
1911 } | |
1912 | |
1913 /* query type "PTR", IP query class */ | |
1914 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18); | |
1915 | |
1916 rn->qlen = (u_short) | |
1917 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t) | |
1918 - rn->query); | |
1919 | |
1920 return NGX_OK; | |
1921 } | |
1922 | |
1923 | |
1924 static ngx_int_t | |
1925 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src, | |
1926 u_char *last) | |
1927 { | |
1928 char *err; | |
1929 u_char *p, *dst; | |
1930 ssize_t len; | |
1931 ngx_uint_t i, n; | |
1932 | |
1933 p = src; | |
1934 len = -1; | |
1935 | |
1936 /* | |
1937 * compression pointers allow to create endless loop, so we set limit; | |
1938 * 128 pointers should be enough to store 255-byte name | |
1939 */ | |
1940 | |
1941 for (i = 0; i < 128; i++) { | |
1942 n = *p++; | |
1943 | |
1944 if (n == 0) { | |
1945 goto done; | |
1946 } | |
1947 | |
1948 if (n & 0xc0) { | |
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1949 n = ((n & 0x3f) << 8) + *p; |
1649 | 1950 p = &buf[n]; |
1951 | |
1952 } else { | |
1953 len += 1 + n; | |
1954 p = &p[n]; | |
1955 } | |
1956 | |
1957 if (p >= last) { | |
1958 err = "name is out of response"; | |
1959 goto invalid; | |
1960 } | |
1961 } | |
1962 | |
1963 err = "compression pointers loop"; | |
1964 | |
1965 invalid: | |
1966 | |
1967 ngx_log_error(r->log_level, r->log, 0, err); | |
1968 | |
1969 return NGX_ERROR; | |
1970 | |
1971 done: | |
1972 | |
1973 if (name == NULL) { | |
583 | 1974 return NGX_OK; |
1975 } | |
1976 | |
3298
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1977 if (len == -1) { |
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1978 name->len = 0; |
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1979 name->data = NULL; |
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1980 return NGX_OK; |
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1981 } |
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1982 |
1649 | 1983 dst = ngx_resolver_alloc(r, len); |
1984 if (dst == NULL) { | |
1985 return NGX_ERROR; | |
1986 } | |
1987 | |
1988 name->data = dst; | |
1989 | |
1990 n = *src++; | |
1991 | |
1992 for ( ;; ) { | |
4267
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1993 if (n & 0xc0) { |
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1994 n = ((n & 0x3f) << 8) + *src; |
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1995 src = &buf[n]; |
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1996 |
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1997 n = *src++; |
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1998 |
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1999 } else { |
1649 | 2000 ngx_memcpy(dst, src, n); |
2001 dst += n; | |
2002 src += n; | |
2003 | |
2004 n = *src++; | |
2005 | |
2006 if (n != 0) { | |
2007 *dst++ = '.'; | |
2008 } | |
2009 } | |
2010 | |
2011 if (n == 0) { | |
2012 name->len = dst - name->data; | |
2013 return NGX_OK; | |
2014 } | |
2015 } | |
2016 } | |
2017 | |
2018 | |
2019 static void | |
2020 ngx_resolver_timeout_handler(ngx_event_t *ev) | |
2021 { | |
2022 ngx_resolver_ctx_t *ctx; | |
2023 | |
2024 ctx = ev->data; | |
2025 | |
2026 ctx->state = NGX_RESOLVE_TIMEDOUT; | |
2027 | |
2028 ctx->handler(ctx); | |
2029 } | |
2030 | |
2031 | |
2032 static void | |
2033 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
2034 { | |
2035 /* lock alloc mutex */ | |
2036 | |
2037 if (rn->query) { | |
2038 ngx_resolver_free_locked(r, rn->query); | |
2039 } | |
2040 | |
2041 if (rn->name) { | |
2042 ngx_resolver_free_locked(r, rn->name); | |
2043 } | |
2044 | |
2045 if (rn->cnlen) { | |
2046 ngx_resolver_free_locked(r, rn->u.cname); | |
2047 } | |
2048 | |
2049 if (rn->naddrs > 1) { | |
2050 ngx_resolver_free_locked(r, rn->u.addrs); | |
2051 } | |
2052 | |
2053 ngx_resolver_free_locked(r, rn); | |
2054 | |
2055 /* unlock alloc mutex */ | |
2056 } | |
2057 | |
2058 | |
2059 static void * | |
2060 ngx_resolver_alloc(ngx_resolver_t *r, size_t size) | |
2061 { | |
2062 u_char *p; | |
2063 | |
2064 /* lock alloc mutex */ | |
2065 | |
2066 p = ngx_alloc(size, r->log); | |
2067 | |
2068 /* unlock alloc mutex */ | |
2069 | |
2070 return p; | |
2071 } | |
2072 | |
2073 | |
1903 | 2074 static void * |
1649 | 2075 ngx_resolver_calloc(ngx_resolver_t *r, size_t size) |
2076 { | |
2077 u_char *p; | |
2078 | |
2079 p = ngx_resolver_alloc(r, size); | |
2080 | |
2081 if (p) { | |
2082 ngx_memzero(p, size); | |
2083 } | |
2084 | |
2085 return p; | |
2086 } | |
2087 | |
2088 | |
2089 static void | |
2090 ngx_resolver_free(ngx_resolver_t *r, void *p) | |
2091 { | |
2092 /* lock alloc mutex */ | |
2093 | |
2094 ngx_free(p); | |
2095 | |
2096 /* unlock alloc mutex */ | |
2097 } | |
2098 | |
2099 | |
2100 static void | |
2101 ngx_resolver_free_locked(ngx_resolver_t *r, void *p) | |
2102 { | |
2103 ngx_free(p); | |
2104 } | |
2105 | |
2106 | |
2107 static void * | |
2108 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size) | |
2109 { | |
2110 void *dst; | |
2111 | |
2112 dst = ngx_resolver_alloc(r, size); | |
2113 | |
2114 if (dst == NULL) { | |
2115 return dst; | |
2116 } | |
2117 | |
2118 ngx_memcpy(dst, src, size); | |
2119 | |
2120 return dst; | |
2121 } | |
2122 | |
2123 | |
2124 char * | |
2125 ngx_resolver_strerror(ngx_int_t err) | |
2126 { | |
2127 static char *errors[] = { | |
2128 "Format error", /* FORMERR */ | |
2129 "Server failure", /* SERVFAIL */ | |
2130 "Host not found", /* NXDOMAIN */ | |
2131 "Unimplemented", /* NOTIMP */ | |
2132 "Operation refused" /* REFUSED */ | |
2133 }; | |
2134 | |
2135 if (err > 0 && err < 6) { | |
2136 return errors[err - 1]; | |
2137 } | |
2138 | |
2139 if (err == NGX_RESOLVE_TIMEDOUT) { | |
2140 return "Operation timed out"; | |
2141 } | |
2142 | |
2143 return "Unknown error"; | |
2144 } | |
2145 | |
2146 | |
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2147 static u_char * |
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2148 ngx_resolver_log_error(ngx_log_t *log, u_char *buf, size_t len) |
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2149 { |
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2150 u_char *p; |
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2151 ngx_udp_connection_t *uc; |
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2152 |
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2153 p = buf; |
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2154 |
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2155 if (log->action) { |
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2156 p = ngx_snprintf(buf, len, " while %s", log->action); |
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2157 len -= p - buf; |
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2158 } |
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2159 |
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2160 uc = log->data; |
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2161 |
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2162 if (uc) { |
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2163 p = ngx_snprintf(p, len, ", resolver: %V", &uc->server); |
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2164 } |
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2165 |
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2166 return p; |
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2167 } |
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2168 |
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2169 |
1649 | 2170 ngx_int_t |
2171 ngx_udp_connect(ngx_udp_connection_t *uc) | |
2172 { | |
2173 int rc; | |
2174 ngx_int_t event; | |
2175 ngx_event_t *rev, *wev; | |
2176 ngx_socket_t s; | |
2177 ngx_connection_t *c; | |
2178 | |
583 | 2179 s = ngx_socket(AF_INET, SOCK_DGRAM, 0); |
2180 | |
3408
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2181 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, &uc->log, 0, "UDP socket %d", s); |
583 | 2182 |
2183 if (s == -1) { | |
3408
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2184 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
583 | 2185 ngx_socket_n " failed"); |
2186 return NGX_ERROR; | |
2187 } | |
2188 | |
3408
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2189 c = ngx_get_connection(s, &uc->log); |
583 | 2190 |
2191 if (c == NULL) { | |
2192 if (ngx_close_socket(s) == -1) { | |
3408
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2193 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
583 | 2194 ngx_close_socket_n "failed"); |
2195 } | |
2196 | |
2197 return NGX_ERROR; | |
2198 } | |
2199 | |
1649 | 2200 if (ngx_nonblocking(s) == -1) { |
3408
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2201 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
1649 | 2202 ngx_nonblocking_n " failed"); |
2203 | |
2204 ngx_free_connection(c); | |
2205 | |
2206 if (ngx_close_socket(s) == -1) { | |
3408
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2207 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
1649 | 2208 ngx_close_socket_n " failed"); |
2209 } | |
2210 | |
2211 return NGX_ERROR; | |
2212 } | |
2213 | |
583 | 2214 rev = c->read; |
2215 wev = c->write; | |
2216 | |
3408
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2217 rev->log = &uc->log; |
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2218 wev->log = &uc->log; |
1649 | 2219 |
2220 uc->connection = c; | |
583 | 2221 |
2222 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); | |
2223 | |
2224 #if (NGX_THREADS) | |
1649 | 2225 |
2226 /* TODO: lock event when call completion handler */ | |
2227 | |
2228 rev->lock = &c->lock; | |
2229 wev->lock = &c->lock; | |
583 | 2230 rev->own_lock = &c->lock; |
2231 wev->own_lock = &c->lock; | |
1649 | 2232 |
583 | 2233 #endif |
2234 | |
3408
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2235 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, &uc->log, 0, |
1649 | 2236 "connect to %V, fd:%d #%d", &uc->server, s, c->number); |
2237 | |
2238 rc = connect(s, uc->sockaddr, uc->socklen); | |
2239 | |
2240 /* TODO: aio, iocp */ | |
583 | 2241 |
2242 if (rc == -1) { | |
3408
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2243 ngx_log_error(NGX_LOG_CRIT, &uc->log, ngx_socket_errno, |
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2244 "connect() failed"); |
583 | 2245 |
2246 return NGX_ERROR; | |
2247 } | |
2248 | |
1649 | 2249 /* UDP sockets are always ready to write */ |
2250 wev->ready = 1; | |
2251 | |
2252 if (ngx_add_event) { | |
2253 | |
2254 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ? | |
2255 /* kqueue, epoll */ NGX_CLEAR_EVENT: | |
2256 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT; | |
2257 /* eventport event type has no meaning: oneshot only */ | |
2258 | |
2259 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { | |
2260 return NGX_ERROR; | |
2261 } | |
2262 | |
2263 } else { | |
2264 /* rtsig */ | |
2265 | |
583 | 2266 if (ngx_add_conn(c) == NGX_ERROR) { |
2267 return NGX_ERROR; | |
2268 } | |
2269 } | |
2270 | |
2271 return NGX_OK; | |
2272 } |