Mercurial > hg > nginx-quic
annotate src/http/modules/ngx_http_realip_module.c @ 2277:732bf367dc08
NGX_OPEN_FILE_DIRECTIO_OFF
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Thu, 16 Oct 2008 13:31:00 +0000 |
parents | 74d270c8821e |
children | 2e91aecb9e57 |
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 /* AF_INET only */ |
18 | |
19 typedef struct { | |
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20 in_addr_t mask; |
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21 in_addr_t addr; |
573 | 22 } ngx_http_realip_from_t; |
23 | |
24 | |
25 typedef struct { | |
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26 ngx_array_t *from; /* array of ngx_http_realip_from_t */ |
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27 ngx_uint_t type; |
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28 ngx_uint_t hash; |
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29 ngx_str_t header; |
573 | 30 } ngx_http_realip_loc_conf_t; |
31 | |
32 | |
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33 typedef struct { |
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34 ngx_connection_t *connection; |
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35 in_addr_t addr; |
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36 ngx_str_t addr_text; |
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37 } ngx_http_realip_ctx_t; |
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38 |
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39 |
573 | 40 static ngx_int_t ngx_http_realip_handler(ngx_http_request_t *r); |
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41 static void ngx_http_realip_cleanup(void *data); |
573 | 42 static char *ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, |
43 void *conf); | |
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44 static char *ngx_http_realip(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); |
573 | 45 static void *ngx_http_realip_create_loc_conf(ngx_conf_t *cf); |
46 static char *ngx_http_realip_merge_loc_conf(ngx_conf_t *cf, | |
47 void *parent, void *child); | |
681 | 48 static ngx_int_t ngx_http_realip_init(ngx_conf_t *cf); |
573 | 49 |
50 | |
51 static ngx_command_t ngx_http_realip_commands[] = { | |
52 | |
53 { ngx_string("set_real_ip_from"), | |
54 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
55 ngx_http_realip_from, | |
56 NGX_HTTP_LOC_CONF_OFFSET, | |
57 0, | |
58 NULL }, | |
59 | |
60 { ngx_string("real_ip_header"), | |
61 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
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62 ngx_http_realip, |
573 | 63 NGX_HTTP_LOC_CONF_OFFSET, |
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64 0, |
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65 NULL }, |
573 | 66 |
67 ngx_null_command | |
68 }; | |
69 | |
70 | |
71 | |
667 | 72 static ngx_http_module_t ngx_http_realip_module_ctx = { |
573 | 73 NULL, /* preconfiguration */ |
681 | 74 ngx_http_realip_init, /* postconfiguration */ |
573 | 75 |
76 NULL, /* create main configuration */ | |
77 NULL, /* init main configuration */ | |
78 | |
79 NULL, /* create server configuration */ | |
80 NULL, /* merge server configuration */ | |
81 | |
82 ngx_http_realip_create_loc_conf, /* create location configuration */ | |
83 ngx_http_realip_merge_loc_conf /* merge location configuration */ | |
84 }; | |
85 | |
86 | |
87 ngx_module_t ngx_http_realip_module = { | |
88 NGX_MODULE_V1, | |
89 &ngx_http_realip_module_ctx, /* module context */ | |
90 ngx_http_realip_commands, /* module directives */ | |
91 NGX_HTTP_MODULE, /* module type */ | |
92 NULL, /* init master */ | |
681 | 93 NULL, /* init module */ |
573 | 94 NULL, /* init process */ |
95 NULL, /* init thread */ | |
96 NULL, /* exit thread */ | |
97 NULL, /* exit process */ | |
98 NULL, /* exit master */ | |
99 NGX_MODULE_V1_PADDING | |
100 }; | |
101 | |
102 | |
103 static ngx_int_t | |
104 ngx_http_realip_handler(ngx_http_request_t *r) | |
105 { | |
106 u_char *ip, *p; | |
107 size_t len; | |
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108 in_addr_t addr; |
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109 ngx_uint_t i, hash; |
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110 ngx_list_part_t *part; |
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111 ngx_table_elt_t *header; |
573 | 112 struct sockaddr_in *sin; |
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113 ngx_connection_t *c; |
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114 ngx_pool_cleanup_t *cln; |
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115 ngx_http_realip_ctx_t *ctx; |
573 | 116 ngx_http_realip_from_t *from; |
117 ngx_http_realip_loc_conf_t *rlcf; | |
118 | |
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119 ctx = ngx_http_get_module_ctx(r, ngx_http_realip_module); |
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120 |
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121 if (ctx) { |
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122 return NGX_DECLINED; |
573 | 123 } |
124 | |
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125 cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_http_realip_ctx_t)); |
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126 if (cln == NULL) { |
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127 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
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128 } |
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129 |
573 | 130 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_realip_module); |
131 | |
132 if (rlcf->from == NULL) { | |
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133 return NGX_DECLINED; |
573 | 134 } |
135 | |
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136 switch (rlcf->type) { |
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137 |
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138 case NGX_HTTP_REALIP_XREALIP: |
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139 |
573 | 140 if (r->headers_in.x_real_ip == NULL) { |
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141 return NGX_DECLINED; |
573 | 142 } |
143 | |
144 len = r->headers_in.x_real_ip->value.len; | |
145 ip = r->headers_in.x_real_ip->value.data; | |
146 | |
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147 break; |
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148 |
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149 case NGX_HTTP_REALIP_XFWD: |
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150 |
573 | 151 if (r->headers_in.x_forwarded_for == NULL) { |
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152 return NGX_DECLINED; |
573 | 153 } |
154 | |
155 len = r->headers_in.x_forwarded_for->value.len; | |
156 ip = r->headers_in.x_forwarded_for->value.data; | |
157 | |
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158 for (p = ip + len - 1; p > ip; p--) { |
573 | 159 if (*p == ' ' || *p == ',') { |
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160 p++; |
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161 len -= p - ip; |
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162 ip = p; |
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163 break; |
573 | 164 } |
165 } | |
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166 |
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167 break; |
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168 |
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169 default: /* NGX_HTTP_REALIP_HEADER */ |
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170 |
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171 part = &r->headers_in.headers.part; |
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172 header = part->elts; |
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173 |
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174 hash = rlcf->hash; |
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175 len = rlcf->header.len; |
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176 p = rlcf->header.data; |
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177 |
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178 for (i = 0; /* void */ ; i++) { |
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179 |
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180 if (i >= part->nelts) { |
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181 if (part->next == NULL) { |
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182 break; |
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183 } |
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184 |
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185 part = part->next; |
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186 header = part->elts; |
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187 i = 0; |
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188 } |
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189 |
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190 if (hash == header[i].hash |
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191 && len == header[i].key.len |
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192 && ngx_strncmp(p, header[i].lowcase_key, len) == 0) |
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193 { |
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194 len = header[i].value.len; |
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195 ip = header[i].value.data; |
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196 |
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197 goto found; |
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198 } |
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199 } |
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200 |
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201 return NGX_DECLINED; |
573 | 202 } |
203 | |
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204 found: |
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205 |
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206 c = r->connection; |
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207 |
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208 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0, "realip: \"%s\"", ip); |
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209 |
573 | 210 /* AF_INET only */ |
211 | |
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212 sin = (struct sockaddr_in *) c->sockaddr; |
573 | 213 |
214 from = rlcf->from->elts; | |
215 for (i = 0; i < rlcf->from->nelts; i++) { | |
216 | |
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217 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0, |
573 | 218 "realip: %08XD %08XD %08XD", |
219 sin->sin_addr.s_addr, from[i].mask, from[i].addr); | |
220 | |
221 if ((sin->sin_addr.s_addr & from[i].mask) == from[i].addr) { | |
222 | |
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223 ctx = cln->data; |
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224 |
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225 ngx_http_set_ctx(r, ctx, ngx_http_realip_module); |
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226 |
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227 addr = inet_addr((char *) ip); |
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228 |
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229 if (addr == INADDR_NONE) { |
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230 return NGX_DECLINED; |
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231 } |
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232 |
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233 p = ngx_pnalloc(c->pool, len); |
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234 if (p == NULL) { |
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235 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
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236 } |
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237 |
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238 ngx_memcpy(p, ip, len); |
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239 |
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240 cln->handler = ngx_http_realip_cleanup; |
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241 |
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242 ctx->connection = c; |
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243 ctx->addr = sin->sin_addr.s_addr; |
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244 ctx->addr_text = c->addr_text; |
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245 |
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246 sin->sin_addr.s_addr = addr; |
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247 |
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248 c->addr_text.len = len; |
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249 c->addr_text.data = p; |
573 | 250 |
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251 return NGX_DECLINED; |
573 | 252 } |
253 } | |
254 | |
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255 return NGX_DECLINED; |
573 | 256 } |
257 | |
258 | |
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259 static void |
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260 ngx_http_realip_cleanup(void *data) |
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261 { |
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262 ngx_http_realip_ctx_t *ctx = data; |
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263 |
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264 ngx_connection_t *c; |
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265 struct sockaddr_in *sin; |
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266 |
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267 c = ctx->connection; |
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268 |
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269 sin = (struct sockaddr_in *) c->sockaddr; |
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270 sin->sin_addr.s_addr = ctx->addr; |
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271 |
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272 c->addr_text = ctx->addr_text; |
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273 } |
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274 |
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275 |
573 | 276 static char * |
277 ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
278 { | |
279 ngx_http_realip_loc_conf_t *rlcf = conf; | |
280 | |
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281 ngx_int_t rc; |
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282 ngx_str_t *value; |
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283 ngx_inet_cidr_t in_cidr; |
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284 ngx_http_realip_from_t *from; |
573 | 285 |
286 if (rlcf->from == NULL) { | |
287 rlcf->from = ngx_array_create(cf->pool, 2, | |
288 sizeof(ngx_http_realip_from_t)); | |
289 if (rlcf->from == NULL) { | |
290 return NGX_CONF_ERROR; | |
291 } | |
292 } | |
293 | |
294 from = ngx_array_push(rlcf->from); | |
295 if (from == NULL) { | |
296 return NGX_CONF_ERROR; | |
297 } | |
298 | |
299 value = cf->args->elts; | |
300 | |
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301 rc = ngx_ptocidr(&value[1], &in_cidr); |
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302 |
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303 if (rc == NGX_ERROR) { |
573 | 304 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"", |
305 &value[1]); | |
306 return NGX_CONF_ERROR; | |
307 } | |
308 | |
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309 if (rc == NGX_DONE) { |
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310 ngx_conf_log_error(NGX_LOG_WARN, cf, 0, |
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311 "low address bits of %V are meaningless", &value[1]); |
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312 } |
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313 |
573 | 314 from->mask = in_cidr.mask; |
315 from->addr = in_cidr.addr; | |
316 | |
317 return NGX_CONF_OK; | |
318 } | |
319 | |
320 | |
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321 static char * |
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322 ngx_http_realip(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
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323 { |
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324 ngx_http_realip_loc_conf_t *rlcf = conf; |
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325 |
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326 ngx_str_t *value; |
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327 |
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328 value = cf->args->elts; |
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329 |
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330 if (ngx_strcmp(value[1].data, "X-Real-IP") == 0) { |
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331 rlcf->type = NGX_HTTP_REALIP_XREALIP; |
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332 return NGX_CONF_OK; |
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333 } |
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334 |
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335 if (ngx_strcmp(value[1].data, "X-Forwarded-For") == 0) { |
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336 rlcf->type = NGX_HTTP_REALIP_XFWD; |
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337 return NGX_CONF_OK; |
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338 } |
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339 |
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340 rlcf->type = NGX_HTTP_REALIP_HEADER; |
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341 rlcf->hash = ngx_hash_strlow(value[1].data, value[1].data, value[1].len); |
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342 rlcf->header = value[1]; |
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343 |
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344 return NGX_CONF_OK; |
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345 } |
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346 |
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347 |
573 | 348 static void * |
349 ngx_http_realip_create_loc_conf(ngx_conf_t *cf) | |
350 { | |
351 ngx_http_realip_loc_conf_t *conf; | |
352 | |
353 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_realip_loc_conf_t)); | |
354 if (conf == NULL) { | |
355 return NGX_CONF_ERROR; | |
356 } | |
357 | |
358 /* | |
359 * set by ngx_pcalloc(): | |
360 * | |
361 * conf->from = NULL; | |
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362 * conf->hash = 0; |
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363 * conf->header = { 0, NULL }; |
573 | 364 */ |
365 | |
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366 conf->type = NGX_CONF_UNSET_UINT; |
573 | 367 |
368 return conf; | |
369 } | |
370 | |
371 | |
372 static char * | |
373 ngx_http_realip_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child) | |
374 { | |
375 ngx_http_realip_loc_conf_t *prev = parent; | |
376 ngx_http_realip_loc_conf_t *conf = child; | |
377 | |
378 if (conf->from == NULL) { | |
379 conf->from = prev->from; | |
380 } | |
381 | |
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382 ngx_conf_merge_uint_value(conf->type, prev->type, NGX_HTTP_REALIP_XREALIP); |
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383 |
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384 if (conf->header.len == 0) { |
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385 conf->hash = prev->hash; |
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386 conf->header = prev->header; |
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387 } |
573 | 388 |
389 return NGX_CONF_OK; | |
390 } | |
391 | |
392 | |
393 static ngx_int_t | |
681 | 394 ngx_http_realip_init(ngx_conf_t *cf) |
573 | 395 { |
396 ngx_http_handler_pt *h; | |
397 ngx_http_core_main_conf_t *cmcf; | |
398 | |
681 | 399 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); |
573 | 400 |
401 h = ngx_array_push(&cmcf->phases[NGX_HTTP_POST_READ_PHASE].handlers); | |
402 if (h == NULL) { | |
403 return NGX_ERROR; | |
404 } | |
405 | |
406 *h = ngx_http_realip_handler; | |
407 | |
581 | 408 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); |
573 | 409 if (h == NULL) { |
410 return NGX_ERROR; | |
411 } | |
412 | |
413 *h = ngx_http_realip_handler; | |
414 | |
415 return NGX_OK; | |
416 } |