Mercurial > hg > nginx
annotate src/http/modules/ngx_http_realip_module.c @ 3273:fe71be4a02f1
support IPv6 addresses in Real IP headers
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Mon, 02 Nov 2009 16:24:27 +0000 |
parents | fb4f7605505f |
children | 95b0b0d7843f |
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 | |
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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 struct sockaddr *sockaddr; |
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34 socklen_t socklen; |
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35 ngx_str_t addr_text; |
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36 } ngx_http_realip_ctx_t; |
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37 |
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38 |
573 | 39 static ngx_int_t ngx_http_realip_handler(ngx_http_request_t *r); |
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40 static void ngx_http_realip_cleanup(void *data); |
573 | 41 static char *ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, |
42 void *conf); | |
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43 static char *ngx_http_realip(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); |
573 | 44 static void *ngx_http_realip_create_loc_conf(ngx_conf_t *cf); |
45 static char *ngx_http_realip_merge_loc_conf(ngx_conf_t *cf, | |
46 void *parent, void *child); | |
681 | 47 static ngx_int_t ngx_http_realip_init(ngx_conf_t *cf); |
573 | 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, | |
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61 ngx_http_realip, |
573 | 62 NGX_HTTP_LOC_CONF_OFFSET, |
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63 0, |
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64 NULL }, |
573 | 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 ngx_int_t rc; |
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108 ngx_uint_t i, hash; |
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109 ngx_addr_t addr; |
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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 if (r->connection->sockaddr->sa_family != AF_INET) { |
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213 return NGX_DECLINED; |
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214 } |
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215 |
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216 sin = (struct sockaddr_in *) c->sockaddr; |
573 | 217 |
218 from = rlcf->from->elts; | |
219 for (i = 0; i < rlcf->from->nelts; i++) { | |
220 | |
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221 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0, |
573 | 222 "realip: %08XD %08XD %08XD", |
223 sin->sin_addr.s_addr, from[i].mask, from[i].addr); | |
224 | |
225 if ((sin->sin_addr.s_addr & from[i].mask) == from[i].addr) { | |
226 | |
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227 ctx = cln->data; |
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228 |
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229 ngx_http_set_ctx(r, ctx, ngx_http_realip_module); |
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230 |
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231 rc = ngx_parse_addr(c->pool, &addr, ip, len); |
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232 |
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233 switch (rc) { |
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234 case NGX_DECLINED: |
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235 return NGX_DECLINED; |
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236 case NGX_ERROR: |
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237 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
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238 default: /* NGX_OK */ |
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239 break; |
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240 } |
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241 |
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242 p = ngx_pnalloc(c->pool, len); |
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243 if (p == NULL) { |
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244 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
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245 } |
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246 |
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247 ngx_memcpy(p, ip, len); |
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248 |
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249 cln->handler = ngx_http_realip_cleanup; |
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250 |
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251 ctx->connection = c; |
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252 ctx->sockaddr = c->sockaddr; |
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253 ctx->socklen = c->socklen; |
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254 ctx->addr_text = c->addr_text; |
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255 |
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256 c->sockaddr = addr.sockaddr; |
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257 c->socklen = addr.socklen; |
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258 c->addr_text.len = len; |
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259 c->addr_text.data = p; |
573 | 260 |
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261 return NGX_DECLINED; |
573 | 262 } |
263 } | |
264 | |
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265 return NGX_DECLINED; |
573 | 266 } |
267 | |
268 | |
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269 static void |
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270 ngx_http_realip_cleanup(void *data) |
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271 { |
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272 ngx_http_realip_ctx_t *ctx = data; |
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273 |
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274 ngx_connection_t *c; |
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275 |
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276 c = ctx->connection; |
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277 |
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278 c->sockaddr = ctx->sockaddr; |
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279 c->socklen = ctx->socklen; |
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280 c->addr_text = ctx->addr_text; |
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281 } |
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282 |
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283 |
573 | 284 static char * |
285 ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
286 { | |
287 ngx_http_realip_loc_conf_t *rlcf = conf; | |
288 | |
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289 ngx_int_t rc; |
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290 ngx_str_t *value; |
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291 ngx_cidr_t cidr; |
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292 ngx_http_realip_from_t *from; |
573 | 293 |
294 if (rlcf->from == NULL) { | |
295 rlcf->from = ngx_array_create(cf->pool, 2, | |
296 sizeof(ngx_http_realip_from_t)); | |
297 if (rlcf->from == NULL) { | |
298 return NGX_CONF_ERROR; | |
299 } | |
300 } | |
301 | |
302 from = ngx_array_push(rlcf->from); | |
303 if (from == NULL) { | |
304 return NGX_CONF_ERROR; | |
305 } | |
306 | |
307 value = cf->args->elts; | |
308 | |
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309 rc = ngx_ptocidr(&value[1], &cidr); |
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310 |
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311 if (rc == NGX_ERROR) { |
573 | 312 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"", |
313 &value[1]); | |
314 return NGX_CONF_ERROR; | |
315 } | |
316 | |
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317 if (cidr.family != AF_INET) { |
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318 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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319 "\"realip_from\" supports IPv4 only"); |
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320 return NGX_CONF_ERROR; |
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321 } |
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322 |
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323 if (rc == NGX_DONE) { |
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324 ngx_conf_log_error(NGX_LOG_WARN, cf, 0, |
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325 "low address bits of %V are meaningless", &value[1]); |
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326 } |
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327 |
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328 from->mask = cidr.u.in.mask; |
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329 from->addr = cidr.u.in.addr; |
573 | 330 |
331 return NGX_CONF_OK; | |
332 } | |
333 | |
334 | |
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335 static char * |
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336 ngx_http_realip(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
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337 { |
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338 ngx_http_realip_loc_conf_t *rlcf = conf; |
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339 |
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340 ngx_str_t *value; |
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341 |
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342 value = cf->args->elts; |
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343 |
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344 if (ngx_strcmp(value[1].data, "X-Real-IP") == 0) { |
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345 rlcf->type = NGX_HTTP_REALIP_XREALIP; |
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346 return NGX_CONF_OK; |
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347 } |
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348 |
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349 if (ngx_strcmp(value[1].data, "X-Forwarded-For") == 0) { |
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350 rlcf->type = NGX_HTTP_REALIP_XFWD; |
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351 return NGX_CONF_OK; |
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352 } |
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353 |
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354 rlcf->type = NGX_HTTP_REALIP_HEADER; |
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355 rlcf->hash = ngx_hash_strlow(value[1].data, value[1].data, value[1].len); |
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356 rlcf->header = value[1]; |
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357 |
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358 return NGX_CONF_OK; |
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359 } |
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360 |
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361 |
573 | 362 static void * |
363 ngx_http_realip_create_loc_conf(ngx_conf_t *cf) | |
364 { | |
365 ngx_http_realip_loc_conf_t *conf; | |
366 | |
367 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_realip_loc_conf_t)); | |
368 if (conf == NULL) { | |
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369 return NULL; |
573 | 370 } |
371 | |
372 /* | |
373 * set by ngx_pcalloc(): | |
374 * | |
375 * conf->from = NULL; | |
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376 * conf->hash = 0; |
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377 * conf->header = { 0, NULL }; |
573 | 378 */ |
379 | |
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380 conf->type = NGX_CONF_UNSET_UINT; |
573 | 381 |
382 return conf; | |
383 } | |
384 | |
385 | |
386 static char * | |
387 ngx_http_realip_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child) | |
388 { | |
389 ngx_http_realip_loc_conf_t *prev = parent; | |
390 ngx_http_realip_loc_conf_t *conf = child; | |
391 | |
392 if (conf->from == NULL) { | |
393 conf->from = prev->from; | |
394 } | |
395 | |
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396 ngx_conf_merge_uint_value(conf->type, prev->type, NGX_HTTP_REALIP_XREALIP); |
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397 |
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398 if (conf->header.len == 0) { |
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399 conf->hash = prev->hash; |
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400 conf->header = prev->header; |
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401 } |
573 | 402 |
403 return NGX_CONF_OK; | |
404 } | |
405 | |
406 | |
407 static ngx_int_t | |
681 | 408 ngx_http_realip_init(ngx_conf_t *cf) |
573 | 409 { |
410 ngx_http_handler_pt *h; | |
411 ngx_http_core_main_conf_t *cmcf; | |
412 | |
681 | 413 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); |
573 | 414 |
415 h = ngx_array_push(&cmcf->phases[NGX_HTTP_POST_READ_PHASE].handlers); | |
416 if (h == NULL) { | |
417 return NGX_ERROR; | |
418 } | |
419 | |
420 *h = ngx_http_realip_handler; | |
421 | |
581 | 422 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); |
573 | 423 if (h == NULL) { |
424 return NGX_ERROR; | |
425 } | |
426 | |
427 *h = ngx_http_realip_handler; | |
428 | |
429 return NGX_OK; | |
430 } |