Mercurial > hg > nginx-quic
annotate src/http/modules/ngx_http_realip_module.c @ 2842:84048fc9225f
update the previous commit
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Thu, 14 May 2009 11:36:26 +0000 |
parents | a472d954c534 |
children | c7d57b539248 |
rev | line source |
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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 | |
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12 #define NGX_HTTP_REALIP_XREALIP 0 |
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13 #define NGX_HTTP_REALIP_XFWD 1 |
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14 #define NGX_HTTP_REALIP_HEADER 2 |
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15 |
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16 |
573 | 17 typedef struct { |
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18 in_addr_t mask; |
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19 in_addr_t addr; |
573 | 20 } ngx_http_realip_from_t; |
21 | |
22 | |
23 typedef struct { | |
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24 ngx_array_t *from; /* array of ngx_http_realip_from_t */ |
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25 ngx_uint_t type; |
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26 ngx_uint_t hash; |
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27 ngx_str_t header; |
573 | 28 } ngx_http_realip_loc_conf_t; |
29 | |
30 | |
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31 typedef struct { |
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32 ngx_connection_t *connection; |
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33 in_addr_t addr; |
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34 ngx_str_t addr_text; |
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35 } ngx_http_realip_ctx_t; |
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36 |
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37 |
573 | 38 static ngx_int_t ngx_http_realip_handler(ngx_http_request_t *r); |
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39 static void ngx_http_realip_cleanup(void *data); |
573 | 40 static char *ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, |
41 void *conf); | |
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42 static char *ngx_http_realip(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); |
573 | 43 static void *ngx_http_realip_create_loc_conf(ngx_conf_t *cf); |
44 static char *ngx_http_realip_merge_loc_conf(ngx_conf_t *cf, | |
45 void *parent, void *child); | |
681 | 46 static ngx_int_t ngx_http_realip_init(ngx_conf_t *cf); |
573 | 47 |
48 | |
49 static ngx_command_t ngx_http_realip_commands[] = { | |
50 | |
51 { ngx_string("set_real_ip_from"), | |
52 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
53 ngx_http_realip_from, | |
54 NGX_HTTP_LOC_CONF_OFFSET, | |
55 0, | |
56 NULL }, | |
57 | |
58 { ngx_string("real_ip_header"), | |
59 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
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60 ngx_http_realip, |
573 | 61 NGX_HTTP_LOC_CONF_OFFSET, |
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62 0, |
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63 NULL }, |
573 | 64 |
65 ngx_null_command | |
66 }; | |
67 | |
68 | |
69 | |
667 | 70 static ngx_http_module_t ngx_http_realip_module_ctx = { |
573 | 71 NULL, /* preconfiguration */ |
681 | 72 ngx_http_realip_init, /* postconfiguration */ |
573 | 73 |
74 NULL, /* create main configuration */ | |
75 NULL, /* init main configuration */ | |
76 | |
77 NULL, /* create server configuration */ | |
78 NULL, /* merge server configuration */ | |
79 | |
80 ngx_http_realip_create_loc_conf, /* create location configuration */ | |
81 ngx_http_realip_merge_loc_conf /* merge location configuration */ | |
82 }; | |
83 | |
84 | |
85 ngx_module_t ngx_http_realip_module = { | |
86 NGX_MODULE_V1, | |
87 &ngx_http_realip_module_ctx, /* module context */ | |
88 ngx_http_realip_commands, /* module directives */ | |
89 NGX_HTTP_MODULE, /* module type */ | |
90 NULL, /* init master */ | |
681 | 91 NULL, /* init module */ |
573 | 92 NULL, /* init process */ |
93 NULL, /* init thread */ | |
94 NULL, /* exit thread */ | |
95 NULL, /* exit process */ | |
96 NULL, /* exit master */ | |
97 NGX_MODULE_V1_PADDING | |
98 }; | |
99 | |
100 | |
101 static ngx_int_t | |
102 ngx_http_realip_handler(ngx_http_request_t *r) | |
103 { | |
104 u_char *ip, *p; | |
105 size_t len; | |
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106 in_addr_t addr; |
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107 ngx_uint_t i, hash; |
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108 ngx_list_part_t *part; |
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109 ngx_table_elt_t *header; |
573 | 110 struct sockaddr_in *sin; |
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111 ngx_connection_t *c; |
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112 ngx_pool_cleanup_t *cln; |
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113 ngx_http_realip_ctx_t *ctx; |
573 | 114 ngx_http_realip_from_t *from; |
115 ngx_http_realip_loc_conf_t *rlcf; | |
116 | |
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117 ctx = ngx_http_get_module_ctx(r, ngx_http_realip_module); |
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118 |
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119 if (ctx) { |
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120 return NGX_DECLINED; |
573 | 121 } |
122 | |
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123 cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_http_realip_ctx_t)); |
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124 if (cln == NULL) { |
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125 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
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126 } |
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127 |
573 | 128 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_realip_module); |
129 | |
130 if (rlcf->from == NULL) { | |
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131 return NGX_DECLINED; |
573 | 132 } |
133 | |
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134 switch (rlcf->type) { |
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135 |
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136 case NGX_HTTP_REALIP_XREALIP: |
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137 |
573 | 138 if (r->headers_in.x_real_ip == NULL) { |
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139 return NGX_DECLINED; |
573 | 140 } |
141 | |
142 len = r->headers_in.x_real_ip->value.len; | |
143 ip = r->headers_in.x_real_ip->value.data; | |
144 | |
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145 break; |
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146 |
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147 case NGX_HTTP_REALIP_XFWD: |
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148 |
573 | 149 if (r->headers_in.x_forwarded_for == NULL) { |
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150 return NGX_DECLINED; |
573 | 151 } |
152 | |
153 len = r->headers_in.x_forwarded_for->value.len; | |
154 ip = r->headers_in.x_forwarded_for->value.data; | |
155 | |
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156 for (p = ip + len - 1; p > ip; p--) { |
573 | 157 if (*p == ' ' || *p == ',') { |
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158 p++; |
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159 len -= p - ip; |
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160 ip = p; |
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161 break; |
573 | 162 } |
163 } | |
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164 |
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165 break; |
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166 |
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167 default: /* NGX_HTTP_REALIP_HEADER */ |
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168 |
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169 part = &r->headers_in.headers.part; |
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170 header = part->elts; |
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171 |
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172 hash = rlcf->hash; |
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173 len = rlcf->header.len; |
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174 p = rlcf->header.data; |
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175 |
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176 for (i = 0; /* void */ ; i++) { |
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177 |
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178 if (i >= part->nelts) { |
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179 if (part->next == NULL) { |
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180 break; |
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181 } |
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182 |
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183 part = part->next; |
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184 header = part->elts; |
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185 i = 0; |
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186 } |
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187 |
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188 if (hash == header[i].hash |
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189 && len == header[i].key.len |
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190 && ngx_strncmp(p, header[i].lowcase_key, len) == 0) |
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191 { |
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192 len = header[i].value.len; |
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193 ip = header[i].value.data; |
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194 |
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195 goto found; |
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196 } |
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197 } |
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198 |
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199 return NGX_DECLINED; |
573 | 200 } |
201 | |
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202 found: |
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203 |
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204 c = r->connection; |
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205 |
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206 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0, "realip: \"%s\"", ip); |
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207 |
573 | 208 /* AF_INET only */ |
209 | |
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210 if (r->connection->sockaddr->sa_family != AF_INET) { |
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211 return NGX_DECLINED; |
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212 } |
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213 |
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214 sin = (struct sockaddr_in *) c->sockaddr; |
573 | 215 |
216 from = rlcf->from->elts; | |
217 for (i = 0; i < rlcf->from->nelts; i++) { | |
218 | |
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219 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0, |
573 | 220 "realip: %08XD %08XD %08XD", |
221 sin->sin_addr.s_addr, from[i].mask, from[i].addr); | |
222 | |
223 if ((sin->sin_addr.s_addr & from[i].mask) == from[i].addr) { | |
224 | |
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225 ctx = cln->data; |
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226 |
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227 ngx_http_set_ctx(r, ctx, ngx_http_realip_module); |
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228 |
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229 addr = inet_addr((char *) ip); |
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230 |
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231 if (addr == INADDR_NONE) { |
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232 return NGX_DECLINED; |
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233 } |
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234 |
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235 p = ngx_pnalloc(c->pool, len); |
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236 if (p == NULL) { |
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237 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
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238 } |
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239 |
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240 ngx_memcpy(p, ip, len); |
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241 |
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242 cln->handler = ngx_http_realip_cleanup; |
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243 |
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244 ctx->connection = c; |
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245 ctx->addr = sin->sin_addr.s_addr; |
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246 ctx->addr_text = c->addr_text; |
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247 |
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248 sin->sin_addr.s_addr = addr; |
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249 |
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250 c->addr_text.len = len; |
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251 c->addr_text.data = p; |
573 | 252 |
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253 return NGX_DECLINED; |
573 | 254 } |
255 } | |
256 | |
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257 return NGX_DECLINED; |
573 | 258 } |
259 | |
260 | |
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261 static void |
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262 ngx_http_realip_cleanup(void *data) |
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263 { |
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264 ngx_http_realip_ctx_t *ctx = data; |
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265 |
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266 ngx_connection_t *c; |
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267 struct sockaddr_in *sin; |
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268 |
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269 c = ctx->connection; |
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270 |
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271 sin = (struct sockaddr_in *) c->sockaddr; |
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272 sin->sin_addr.s_addr = ctx->addr; |
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273 |
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274 c->addr_text = ctx->addr_text; |
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275 } |
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276 |
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277 |
573 | 278 static char * |
279 ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
280 { | |
281 ngx_http_realip_loc_conf_t *rlcf = conf; | |
282 | |
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283 ngx_int_t rc; |
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284 ngx_str_t *value; |
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285 ngx_cidr_t cidr; |
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286 ngx_http_realip_from_t *from; |
573 | 287 |
288 if (rlcf->from == NULL) { | |
289 rlcf->from = ngx_array_create(cf->pool, 2, | |
290 sizeof(ngx_http_realip_from_t)); | |
291 if (rlcf->from == NULL) { | |
292 return NGX_CONF_ERROR; | |
293 } | |
294 } | |
295 | |
296 from = ngx_array_push(rlcf->from); | |
297 if (from == NULL) { | |
298 return NGX_CONF_ERROR; | |
299 } | |
300 | |
301 value = cf->args->elts; | |
302 | |
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303 rc = ngx_ptocidr(&value[1], &cidr); |
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304 |
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305 if (rc == NGX_ERROR) { |
573 | 306 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"", |
307 &value[1]); | |
308 return NGX_CONF_ERROR; | |
309 } | |
310 | |
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311 if (cidr.family != AF_INET) { |
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312 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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313 "\"realip_from\" supports IPv4 only"); |
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314 return NGX_CONF_ERROR; |
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315 } |
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316 |
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317 if (rc == NGX_DONE) { |
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318 ngx_conf_log_error(NGX_LOG_WARN, cf, 0, |
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319 "low address bits of %V are meaningless", &value[1]); |
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320 } |
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321 |
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322 from->mask = cidr.u.in.mask; |
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323 from->addr = cidr.u.in.addr; |
573 | 324 |
325 return NGX_CONF_OK; | |
326 } | |
327 | |
328 | |
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329 static char * |
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330 ngx_http_realip(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
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331 { |
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332 ngx_http_realip_loc_conf_t *rlcf = conf; |
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333 |
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334 ngx_str_t *value; |
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335 |
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336 value = cf->args->elts; |
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337 |
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338 if (ngx_strcmp(value[1].data, "X-Real-IP") == 0) { |
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339 rlcf->type = NGX_HTTP_REALIP_XREALIP; |
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340 return NGX_CONF_OK; |
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341 } |
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342 |
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343 if (ngx_strcmp(value[1].data, "X-Forwarded-For") == 0) { |
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344 rlcf->type = NGX_HTTP_REALIP_XFWD; |
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345 return NGX_CONF_OK; |
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346 } |
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347 |
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348 rlcf->type = NGX_HTTP_REALIP_HEADER; |
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349 rlcf->hash = ngx_hash_strlow(value[1].data, value[1].data, value[1].len); |
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350 rlcf->header = value[1]; |
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351 |
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352 return NGX_CONF_OK; |
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353 } |
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354 |
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355 |
573 | 356 static void * |
357 ngx_http_realip_create_loc_conf(ngx_conf_t *cf) | |
358 { | |
359 ngx_http_realip_loc_conf_t *conf; | |
360 | |
361 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_realip_loc_conf_t)); | |
362 if (conf == NULL) { | |
363 return NGX_CONF_ERROR; | |
364 } | |
365 | |
366 /* | |
367 * set by ngx_pcalloc(): | |
368 * | |
369 * conf->from = NULL; | |
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370 * conf->hash = 0; |
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371 * conf->header = { 0, NULL }; |
573 | 372 */ |
373 | |
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374 conf->type = NGX_CONF_UNSET_UINT; |
573 | 375 |
376 return conf; | |
377 } | |
378 | |
379 | |
380 static char * | |
381 ngx_http_realip_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child) | |
382 { | |
383 ngx_http_realip_loc_conf_t *prev = parent; | |
384 ngx_http_realip_loc_conf_t *conf = child; | |
385 | |
386 if (conf->from == NULL) { | |
387 conf->from = prev->from; | |
388 } | |
389 | |
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390 ngx_conf_merge_uint_value(conf->type, prev->type, NGX_HTTP_REALIP_XREALIP); |
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391 |
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392 if (conf->header.len == 0) { |
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393 conf->hash = prev->hash; |
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394 conf->header = prev->header; |
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395 } |
573 | 396 |
397 return NGX_CONF_OK; | |
398 } | |
399 | |
400 | |
401 static ngx_int_t | |
681 | 402 ngx_http_realip_init(ngx_conf_t *cf) |
573 | 403 { |
404 ngx_http_handler_pt *h; | |
405 ngx_http_core_main_conf_t *cmcf; | |
406 | |
681 | 407 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); |
573 | 408 |
409 h = ngx_array_push(&cmcf->phases[NGX_HTTP_POST_READ_PHASE].handlers); | |
410 if (h == NULL) { | |
411 return NGX_ERROR; | |
412 } | |
413 | |
414 *h = ngx_http_realip_handler; | |
415 | |
581 | 416 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); |
573 | 417 if (h == NULL) { |
418 return NGX_ERROR; | |
419 } | |
420 | |
421 *h = ngx_http_realip_handler; | |
422 | |
423 return NGX_OK; | |
424 } |