Mercurial > hg > nginx
annotate src/http/modules/ngx_http_realip_module.c @ 2049:2a92804f4109
*) back out r2040
*) refactor ngx_palloc()
*) introduce ngx_pnalloc()
*) additional pool blocks have smaller header
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Tue, 17 Jun 2008 15:00:30 +0000 |
| parents | b590a528fd41 |
| children | 29d26406e1bd |
| 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 { | |
| 15 in_addr_t mask; | |
| 16 in_addr_t addr; | |
| 17 } ngx_http_realip_from_t; | |
| 18 | |
| 19 | |
| 20 typedef struct { | |
| 21 ngx_array_t *from; /* array of ngx_http_realip_from_t */ | |
| 22 | |
| 23 ngx_uint_t xfwd; | |
| 24 } ngx_http_realip_loc_conf_t; | |
| 25 | |
| 26 | |
| 27 static ngx_int_t ngx_http_realip_handler(ngx_http_request_t *r); | |
| 28 static char *ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, | |
| 29 void *conf); | |
| 30 static void *ngx_http_realip_create_loc_conf(ngx_conf_t *cf); | |
| 31 static char *ngx_http_realip_merge_loc_conf(ngx_conf_t *cf, | |
| 32 void *parent, void *child); | |
| 681 | 33 static ngx_int_t ngx_http_realip_init(ngx_conf_t *cf); |
| 573 | 34 |
| 35 | |
| 36 static ngx_conf_enum_t ngx_http_realip_header[] = { | |
| 37 { ngx_string("X-Forwarded-For"), 1 }, | |
| 38 { ngx_string("X-Real-IP"), 0 }, | |
| 39 { ngx_null_string, 0 } | |
| 40 }; | |
| 41 | |
| 42 | |
| 43 static ngx_command_t ngx_http_realip_commands[] = { | |
| 44 | |
| 45 { ngx_string("set_real_ip_from"), | |
| 46 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
| 47 ngx_http_realip_from, | |
| 48 NGX_HTTP_LOC_CONF_OFFSET, | |
| 49 0, | |
| 50 NULL }, | |
| 51 | |
| 52 { ngx_string("real_ip_header"), | |
| 53 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
| 54 ngx_conf_set_enum_slot, | |
| 55 NGX_HTTP_LOC_CONF_OFFSET, | |
| 56 offsetof(ngx_http_realip_loc_conf_t, xfwd), | |
| 57 &ngx_http_realip_header }, | |
| 58 | |
| 59 ngx_null_command | |
| 60 }; | |
| 61 | |
| 62 | |
| 63 | |
| 667 | 64 static ngx_http_module_t ngx_http_realip_module_ctx = { |
| 573 | 65 NULL, /* preconfiguration */ |
| 681 | 66 ngx_http_realip_init, /* postconfiguration */ |
| 573 | 67 |
| 68 NULL, /* create main configuration */ | |
| 69 NULL, /* init main configuration */ | |
| 70 | |
| 71 NULL, /* create server configuration */ | |
| 72 NULL, /* merge server configuration */ | |
| 73 | |
| 74 ngx_http_realip_create_loc_conf, /* create location configuration */ | |
| 75 ngx_http_realip_merge_loc_conf /* merge location configuration */ | |
| 76 }; | |
| 77 | |
| 78 | |
| 79 ngx_module_t ngx_http_realip_module = { | |
| 80 NGX_MODULE_V1, | |
| 81 &ngx_http_realip_module_ctx, /* module context */ | |
| 82 ngx_http_realip_commands, /* module directives */ | |
| 83 NGX_HTTP_MODULE, /* module type */ | |
| 84 NULL, /* init master */ | |
| 681 | 85 NULL, /* init module */ |
| 573 | 86 NULL, /* init process */ |
| 87 NULL, /* init thread */ | |
| 88 NULL, /* exit thread */ | |
| 89 NULL, /* exit process */ | |
| 90 NULL, /* exit master */ | |
| 91 NGX_MODULE_V1_PADDING | |
| 92 }; | |
| 93 | |
| 94 | |
| 95 static ngx_int_t | |
| 96 ngx_http_realip_handler(ngx_http_request_t *r) | |
| 97 { | |
| 98 u_char *ip, *p; | |
| 99 size_t len; | |
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100 in_addr_t addr; |
| 573 | 101 ngx_uint_t i; |
| 102 struct sockaddr_in *sin; | |
| 103 ngx_http_realip_from_t *from; | |
| 104 ngx_http_realip_loc_conf_t *rlcf; | |
| 105 | |
| 106 if (r->realip_set) { | |
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107 return NGX_DECLINED; |
| 573 | 108 } |
| 109 | |
| 110 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_realip_module); | |
| 111 | |
| 112 if (rlcf->from == NULL) { | |
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113 return NGX_DECLINED; |
| 573 | 114 } |
| 115 | |
| 116 if (rlcf->xfwd == 0) { | |
| 117 if (r->headers_in.x_real_ip == NULL) { | |
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118 return NGX_DECLINED; |
| 573 | 119 } |
| 120 | |
| 121 len = r->headers_in.x_real_ip->value.len; | |
| 122 ip = r->headers_in.x_real_ip->value.data; | |
| 123 | |
| 124 } else { | |
| 125 if (r->headers_in.x_forwarded_for == NULL) { | |
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126 return NGX_DECLINED; |
| 573 | 127 } |
| 128 | |
| 129 len = r->headers_in.x_forwarded_for->value.len; | |
| 130 ip = r->headers_in.x_forwarded_for->value.data; | |
| 131 | |
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132 for (p = ip + len - 1; p > ip; p--) { |
| 573 | 133 if (*p == ' ' || *p == ',') { |
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134 p++; |
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135 len -= p - ip; |
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136 ip = p; |
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137 break; |
| 573 | 138 } |
| 139 } | |
| 140 } | |
| 141 | |
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142 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
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143 "realip: \"%s\"", ip); |
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parents:
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144 |
| 573 | 145 /* AF_INET only */ |
| 146 | |
| 147 sin = (struct sockaddr_in *) r->connection->sockaddr; | |
| 148 | |
| 149 from = rlcf->from->elts; | |
| 150 for (i = 0; i < rlcf->from->nelts; i++) { | |
| 151 | |
| 152 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 153 "realip: %08XD %08XD %08XD", | |
| 154 sin->sin_addr.s_addr, from[i].mask, from[i].addr); | |
| 155 | |
| 156 if ((sin->sin_addr.s_addr & from[i].mask) == from[i].addr) { | |
| 157 | |
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158 r->realip_set = 1; |
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159 |
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160 addr = inet_addr((char *) ip); |
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161 |
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162 if (addr == INADDR_NONE) { |
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163 return NGX_DECLINED; |
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parents:
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164 } |
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165 |
| 2049 | 166 p = ngx_pnalloc(r->connection->pool, len); |
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167 if (p == NULL) { |
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168 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
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169 } |
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170 |
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171 ngx_memcpy(p, ip, len); |
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172 |
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parents:
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173 sin->sin_addr.s_addr = addr; |
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parents:
986
diff
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174 |
| 573 | 175 r->connection->addr_text.len = len; |
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parents:
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176 r->connection->addr_text.data = p; |
| 573 | 177 |
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Igor Sysoev <igor@sysoev.ru>
parents:
681
diff
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178 return NGX_DECLINED; |
| 573 | 179 } |
| 180 } | |
| 181 | |
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Igor Sysoev <igor@sysoev.ru>
parents:
681
diff
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182 return NGX_DECLINED; |
| 573 | 183 } |
| 184 | |
| 185 | |
| 186 static char * | |
| 187 ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 188 { | |
| 189 ngx_http_realip_loc_conf_t *rlcf = conf; | |
| 190 | |
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191 ngx_int_t rc; |
| 573 | 192 ngx_str_t *value; |
| 193 ngx_inet_cidr_t in_cidr; | |
| 194 ngx_http_realip_from_t *from; | |
| 195 | |
| 196 if (rlcf->from == NULL) { | |
| 197 rlcf->from = ngx_array_create(cf->pool, 2, | |
| 198 sizeof(ngx_http_realip_from_t)); | |
| 199 if (rlcf->from == NULL) { | |
| 200 return NGX_CONF_ERROR; | |
| 201 } | |
| 202 } | |
| 203 | |
| 204 from = ngx_array_push(rlcf->from); | |
| 205 if (from == NULL) { | |
| 206 return NGX_CONF_ERROR; | |
| 207 } | |
| 208 | |
| 209 value = cf->args->elts; | |
| 210 | |
| 211 from->addr = inet_addr((char *) value[1].data); | |
| 212 | |
| 213 if (from->addr != INADDR_NONE) { | |
| 214 from->mask = 0xffffffff; | |
| 215 | |
| 216 return NGX_CONF_OK; | |
| 217 } | |
| 218 | |
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219 rc = ngx_ptocidr(&value[1], &in_cidr); |
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220 |
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221 if (rc == NGX_ERROR) { |
| 573 | 222 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"", |
| 223 &value[1]); | |
| 224 return NGX_CONF_ERROR; | |
| 225 } | |
| 226 | |
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227 if (rc == NGX_DONE) { |
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228 ngx_conf_log_error(NGX_LOG_WARN, cf, 0, |
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229 "low address bits of %V are meaningless", &value[1]); |
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230 } |
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231 |
| 573 | 232 from->mask = in_cidr.mask; |
| 233 from->addr = in_cidr.addr; | |
| 234 | |
| 235 return NGX_CONF_OK; | |
| 236 } | |
| 237 | |
| 238 | |
| 239 static void * | |
| 240 ngx_http_realip_create_loc_conf(ngx_conf_t *cf) | |
| 241 { | |
| 242 ngx_http_realip_loc_conf_t *conf; | |
| 243 | |
| 244 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_realip_loc_conf_t)); | |
| 245 if (conf == NULL) { | |
| 246 return NGX_CONF_ERROR; | |
| 247 } | |
| 248 | |
| 249 /* | |
| 250 * set by ngx_pcalloc(): | |
| 251 * | |
| 252 * conf->from = NULL; | |
| 253 */ | |
| 254 | |
| 255 conf->xfwd = NGX_CONF_UNSET_UINT; | |
| 256 | |
| 257 return conf; | |
| 258 } | |
| 259 | |
| 260 | |
| 261 static char * | |
| 262 ngx_http_realip_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child) | |
| 263 { | |
| 264 ngx_http_realip_loc_conf_t *prev = parent; | |
| 265 ngx_http_realip_loc_conf_t *conf = child; | |
| 266 | |
| 267 if (conf->from == NULL) { | |
| 268 conf->from = prev->from; | |
| 269 } | |
| 270 | |
| 663 | 271 ngx_conf_merge_uint_value(conf->xfwd, prev->xfwd, 0); |
| 573 | 272 |
| 273 return NGX_CONF_OK; | |
| 274 } | |
| 275 | |
| 276 | |
| 277 static ngx_int_t | |
| 681 | 278 ngx_http_realip_init(ngx_conf_t *cf) |
| 573 | 279 { |
| 280 ngx_http_handler_pt *h; | |
| 281 ngx_http_core_main_conf_t *cmcf; | |
| 282 | |
| 681 | 283 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); |
| 573 | 284 |
| 285 h = ngx_array_push(&cmcf->phases[NGX_HTTP_POST_READ_PHASE].handlers); | |
| 286 if (h == NULL) { | |
| 287 return NGX_ERROR; | |
| 288 } | |
| 289 | |
| 290 *h = ngx_http_realip_handler; | |
| 291 | |
| 581 | 292 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); |
| 573 | 293 if (h == NULL) { |
| 294 return NGX_ERROR; | |
| 295 } | |
| 296 | |
| 297 *h = ngx_http_realip_handler; | |
| 298 | |
| 299 return NGX_OK; | |
| 300 } |