Mercurial > hg > nginx
annotate src/http/modules/ngx_http_realip_module.c @ 2176:29d26406e1bd
restore connection address on request closure,
this fixes the issue when a frontend before nginx sends various client
connections via keepalive connection to nginx
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Wed, 13 Aug 2008 16:31:01 +0000 |
| parents | 2a92804f4109 |
| children | 2300ab9b069e |
| rev | line source |
|---|---|
| 573 | 1 |
| 2 /* | |
| 3 * Copyright (C) Igor Sysoev | |
| 4 */ | |
| 5 | |
| 6 | |
| 7 #include <ngx_config.h> | |
| 8 #include <ngx_core.h> | |
| 9 #include <ngx_http.h> | |
| 10 | |
| 11 | |
| 12 /* AF_INET only */ | |
| 13 | |
| 14 typedef struct { | |
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15 in_addr_t mask; |
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16 in_addr_t addr; |
| 573 | 17 } ngx_http_realip_from_t; |
| 18 | |
| 19 | |
| 20 typedef struct { | |
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21 ngx_array_t *from; /* array of ngx_http_realip_from_t */ |
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22 ngx_uint_t xfwd; |
| 573 | 23 } ngx_http_realip_loc_conf_t; |
| 24 | |
| 25 | |
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26 typedef struct { |
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27 ngx_connection_t *connection; |
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28 in_addr_t addr; |
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29 ngx_str_t addr_text; |
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30 } ngx_http_realip_ctx_t; |
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31 |
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32 |
| 573 | 33 static ngx_int_t ngx_http_realip_handler(ngx_http_request_t *r); |
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34 static void ngx_http_realip_cleanup(void *data); |
| 573 | 35 static char *ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, |
| 36 void *conf); | |
| 37 static void *ngx_http_realip_create_loc_conf(ngx_conf_t *cf); | |
| 38 static char *ngx_http_realip_merge_loc_conf(ngx_conf_t *cf, | |
| 39 void *parent, void *child); | |
| 681 | 40 static ngx_int_t ngx_http_realip_init(ngx_conf_t *cf); |
| 573 | 41 |
| 42 | |
| 43 static ngx_conf_enum_t ngx_http_realip_header[] = { | |
| 44 { ngx_string("X-Forwarded-For"), 1 }, | |
| 45 { ngx_string("X-Real-IP"), 0 }, | |
| 46 { ngx_null_string, 0 } | |
| 47 }; | |
| 48 | |
| 49 | |
| 50 static ngx_command_t ngx_http_realip_commands[] = { | |
| 51 | |
| 52 { ngx_string("set_real_ip_from"), | |
| 53 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
| 54 ngx_http_realip_from, | |
| 55 NGX_HTTP_LOC_CONF_OFFSET, | |
| 56 0, | |
| 57 NULL }, | |
| 58 | |
| 59 { ngx_string("real_ip_header"), | |
| 60 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
| 61 ngx_conf_set_enum_slot, | |
| 62 NGX_HTTP_LOC_CONF_OFFSET, | |
| 63 offsetof(ngx_http_realip_loc_conf_t, xfwd), | |
| 64 &ngx_http_realip_header }, | |
| 65 | |
| 66 ngx_null_command | |
| 67 }; | |
| 68 | |
| 69 | |
| 70 | |
| 667 | 71 static ngx_http_module_t ngx_http_realip_module_ctx = { |
| 573 | 72 NULL, /* preconfiguration */ |
| 681 | 73 ngx_http_realip_init, /* postconfiguration */ |
| 573 | 74 |
| 75 NULL, /* create main configuration */ | |
| 76 NULL, /* init main configuration */ | |
| 77 | |
| 78 NULL, /* create server configuration */ | |
| 79 NULL, /* merge server configuration */ | |
| 80 | |
| 81 ngx_http_realip_create_loc_conf, /* create location configuration */ | |
| 82 ngx_http_realip_merge_loc_conf /* merge location configuration */ | |
| 83 }; | |
| 84 | |
| 85 | |
| 86 ngx_module_t ngx_http_realip_module = { | |
| 87 NGX_MODULE_V1, | |
| 88 &ngx_http_realip_module_ctx, /* module context */ | |
| 89 ngx_http_realip_commands, /* module directives */ | |
| 90 NGX_HTTP_MODULE, /* module type */ | |
| 91 NULL, /* init master */ | |
| 681 | 92 NULL, /* init module */ |
| 573 | 93 NULL, /* init process */ |
| 94 NULL, /* init thread */ | |
| 95 NULL, /* exit thread */ | |
| 96 NULL, /* exit process */ | |
| 97 NULL, /* exit master */ | |
| 98 NGX_MODULE_V1_PADDING | |
| 99 }; | |
| 100 | |
| 101 | |
| 102 static ngx_int_t | |
| 103 ngx_http_realip_handler(ngx_http_request_t *r) | |
| 104 { | |
| 105 u_char *ip, *p; | |
| 106 size_t len; | |
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107 in_addr_t addr; |
| 573 | 108 ngx_uint_t i; |
| 109 struct sockaddr_in *sin; | |
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110 ngx_connection_t *c; |
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111 ngx_pool_cleanup_t *cln; |
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112 ngx_http_realip_ctx_t *ctx; |
| 573 | 113 ngx_http_realip_from_t *from; |
| 114 ngx_http_realip_loc_conf_t *rlcf; | |
| 115 | |
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116 ctx = ngx_http_get_module_ctx(r, ngx_http_realip_module); |
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117 |
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118 if (ctx) { |
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119 return NGX_DECLINED; |
| 573 | 120 } |
| 121 | |
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122 cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_http_realip_ctx_t)); |
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123 if (cln == NULL) { |
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124 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
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125 } |
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126 |
| 573 | 127 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_realip_module); |
| 128 | |
| 129 if (rlcf->from == NULL) { | |
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130 return NGX_DECLINED; |
| 573 | 131 } |
| 132 | |
| 133 if (rlcf->xfwd == 0) { | |
| 134 if (r->headers_in.x_real_ip == NULL) { | |
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135 return NGX_DECLINED; |
| 573 | 136 } |
| 137 | |
| 138 len = r->headers_in.x_real_ip->value.len; | |
| 139 ip = r->headers_in.x_real_ip->value.data; | |
| 140 | |
| 141 } else { | |
| 142 if (r->headers_in.x_forwarded_for == NULL) { | |
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143 return NGX_DECLINED; |
| 573 | 144 } |
| 145 | |
| 146 len = r->headers_in.x_forwarded_for->value.len; | |
| 147 ip = r->headers_in.x_forwarded_for->value.data; | |
| 148 | |
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149 for (p = ip + len - 1; p > ip; p--) { |
| 573 | 150 if (*p == ' ' || *p == ',') { |
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151 p++; |
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152 len -= p - ip; |
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153 ip = p; |
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154 break; |
| 573 | 155 } |
| 156 } | |
| 157 } | |
| 158 | |
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159 c = r->connection; |
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160 |
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161 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0, "realip: \"%s\"", ip); |
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162 |
| 573 | 163 /* AF_INET only */ |
| 164 | |
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165 sin = (struct sockaddr_in *) c->sockaddr; |
| 573 | 166 |
| 167 from = rlcf->from->elts; | |
| 168 for (i = 0; i < rlcf->from->nelts; i++) { | |
| 169 | |
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170 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0, |
| 573 | 171 "realip: %08XD %08XD %08XD", |
| 172 sin->sin_addr.s_addr, from[i].mask, from[i].addr); | |
| 173 | |
| 174 if ((sin->sin_addr.s_addr & from[i].mask) == from[i].addr) { | |
| 175 | |
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176 ctx = cln->data; |
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177 |
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178 ngx_http_set_ctx(r, ctx, ngx_http_realip_module); |
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179 |
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180 addr = inet_addr((char *) ip); |
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181 |
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182 if (addr == INADDR_NONE) { |
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183 return NGX_DECLINED; |
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184 } |
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185 |
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186 p = ngx_pnalloc(c->pool, len); |
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187 if (p == NULL) { |
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188 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
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189 } |
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190 |
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191 ngx_memcpy(p, ip, len); |
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192 |
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193 cln->handler = ngx_http_realip_cleanup; |
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194 |
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195 ctx->connection = c; |
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196 ctx->addr = sin->sin_addr.s_addr; |
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197 ctx->addr_text = c->addr_text; |
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198 |
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199 sin->sin_addr.s_addr = addr; |
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200 |
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201 c->addr_text.len = len; |
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202 c->addr_text.data = p; |
| 573 | 203 |
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204 return NGX_DECLINED; |
| 573 | 205 } |
| 206 } | |
| 207 | |
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208 return NGX_DECLINED; |
| 573 | 209 } |
| 210 | |
| 211 | |
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212 static void |
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213 ngx_http_realip_cleanup(void *data) |
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214 { |
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215 ngx_http_realip_ctx_t *ctx = data; |
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216 |
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217 ngx_connection_t *c; |
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218 struct sockaddr_in *sin; |
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219 |
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220 c = ctx->connection; |
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221 |
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222 sin = (struct sockaddr_in *) c->sockaddr; |
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223 sin->sin_addr.s_addr = ctx->addr; |
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224 |
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225 c->addr_text = ctx->addr_text; |
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226 } |
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227 |
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228 |
| 573 | 229 static char * |
| 230 ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 231 { | |
| 232 ngx_http_realip_loc_conf_t *rlcf = conf; | |
| 233 | |
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234 ngx_int_t rc; |
| 573 | 235 ngx_str_t *value; |
| 236 ngx_inet_cidr_t in_cidr; | |
| 237 ngx_http_realip_from_t *from; | |
| 238 | |
| 239 if (rlcf->from == NULL) { | |
| 240 rlcf->from = ngx_array_create(cf->pool, 2, | |
| 241 sizeof(ngx_http_realip_from_t)); | |
| 242 if (rlcf->from == NULL) { | |
| 243 return NGX_CONF_ERROR; | |
| 244 } | |
| 245 } | |
| 246 | |
| 247 from = ngx_array_push(rlcf->from); | |
| 248 if (from == NULL) { | |
| 249 return NGX_CONF_ERROR; | |
| 250 } | |
| 251 | |
| 252 value = cf->args->elts; | |
| 253 | |
| 254 from->addr = inet_addr((char *) value[1].data); | |
| 255 | |
| 256 if (from->addr != INADDR_NONE) { | |
| 257 from->mask = 0xffffffff; | |
| 258 | |
| 259 return NGX_CONF_OK; | |
| 260 } | |
| 261 | |
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262 rc = ngx_ptocidr(&value[1], &in_cidr); |
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263 |
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264 if (rc == NGX_ERROR) { |
| 573 | 265 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"", |
| 266 &value[1]); | |
| 267 return NGX_CONF_ERROR; | |
| 268 } | |
| 269 | |
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270 if (rc == NGX_DONE) { |
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271 ngx_conf_log_error(NGX_LOG_WARN, cf, 0, |
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272 "low address bits of %V are meaningless", &value[1]); |
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273 } |
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274 |
| 573 | 275 from->mask = in_cidr.mask; |
| 276 from->addr = in_cidr.addr; | |
| 277 | |
| 278 return NGX_CONF_OK; | |
| 279 } | |
| 280 | |
| 281 | |
| 282 static void * | |
| 283 ngx_http_realip_create_loc_conf(ngx_conf_t *cf) | |
| 284 { | |
| 285 ngx_http_realip_loc_conf_t *conf; | |
| 286 | |
| 287 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_realip_loc_conf_t)); | |
| 288 if (conf == NULL) { | |
| 289 return NGX_CONF_ERROR; | |
| 290 } | |
| 291 | |
| 292 /* | |
| 293 * set by ngx_pcalloc(): | |
| 294 * | |
| 295 * conf->from = NULL; | |
| 296 */ | |
| 297 | |
| 298 conf->xfwd = NGX_CONF_UNSET_UINT; | |
| 299 | |
| 300 return conf; | |
| 301 } | |
| 302 | |
| 303 | |
| 304 static char * | |
| 305 ngx_http_realip_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child) | |
| 306 { | |
| 307 ngx_http_realip_loc_conf_t *prev = parent; | |
| 308 ngx_http_realip_loc_conf_t *conf = child; | |
| 309 | |
| 310 if (conf->from == NULL) { | |
| 311 conf->from = prev->from; | |
| 312 } | |
| 313 | |
| 663 | 314 ngx_conf_merge_uint_value(conf->xfwd, prev->xfwd, 0); |
| 573 | 315 |
| 316 return NGX_CONF_OK; | |
| 317 } | |
| 318 | |
| 319 | |
| 320 static ngx_int_t | |
| 681 | 321 ngx_http_realip_init(ngx_conf_t *cf) |
| 573 | 322 { |
| 323 ngx_http_handler_pt *h; | |
| 324 ngx_http_core_main_conf_t *cmcf; | |
| 325 | |
| 681 | 326 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); |
| 573 | 327 |
| 328 h = ngx_array_push(&cmcf->phases[NGX_HTTP_POST_READ_PHASE].handlers); | |
| 329 if (h == NULL) { | |
| 330 return NGX_ERROR; | |
| 331 } | |
| 332 | |
| 333 *h = ngx_http_realip_handler; | |
| 334 | |
| 581 | 335 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); |
| 573 | 336 if (h == NULL) { |
| 337 return NGX_ERROR; | |
| 338 } | |
| 339 | |
| 340 *h = ngx_http_realip_handler; | |
| 341 | |
| 342 return NGX_OK; | |
| 343 } |