Mercurial > hg > nginx-quic
annotate src/http/modules/ngx_http_realip_module.c @ 6077:0395f788b080 stable-1.6
Resolver: fixed use-after-free memory access.
In 954867a2f0a6, we switched to using resolver node as the
timer event data, so make sure we do not free resolver node
memory until the corresponding timer is deleted.
author | Ruslan Ermilov <ru@nginx.com> |
---|---|
date | Thu, 20 Nov 2014 15:24:40 +0300 |
parents | 3a72b1805c52 |
children | cebe43bace93 |
rev | line source |
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573 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4412 | 4 * Copyright (C) Nginx, Inc. |
573 | 5 */ |
6 | |
7 | |
8 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 #include <ngx_http.h> | |
11 | |
12 | |
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13 #define NGX_HTTP_REALIP_XREALIP 0 |
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14 #define NGX_HTTP_REALIP_XFWD 1 |
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15 #define NGX_HTTP_REALIP_HEADER 2 |
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16 #define NGX_HTTP_REALIP_PROXY 3 |
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17 |
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18 |
573 | 19 typedef struct { |
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20 ngx_array_t *from; /* array of ngx_cidr_t */ |
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21 ngx_uint_t type; |
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22 ngx_uint_t hash; |
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23 ngx_str_t header; |
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24 ngx_flag_t recursive; |
573 | 25 } ngx_http_realip_loc_conf_t; |
26 | |
27 | |
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28 typedef struct { |
3274 | 29 ngx_connection_t *connection; |
30 struct sockaddr *sockaddr; | |
31 socklen_t socklen; | |
32 ngx_str_t addr_text; | |
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33 } ngx_http_realip_ctx_t; |
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34 |
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35 |
573 | 36 static ngx_int_t ngx_http_realip_handler(ngx_http_request_t *r); |
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37 static ngx_int_t ngx_http_realip_set_addr(ngx_http_request_t *r, |
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38 ngx_addr_t *addr); |
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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 |
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65 { ngx_string("real_ip_recursive"), |
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66 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG, |
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67 ngx_conf_set_flag_slot, |
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68 NGX_HTTP_LOC_CONF_OFFSET, |
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69 offsetof(ngx_http_realip_loc_conf_t, recursive), |
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70 NULL }, |
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71 |
573 | 72 ngx_null_command |
73 }; | |
74 | |
75 | |
76 | |
667 | 77 static ngx_http_module_t ngx_http_realip_module_ctx = { |
573 | 78 NULL, /* preconfiguration */ |
681 | 79 ngx_http_realip_init, /* postconfiguration */ |
573 | 80 |
81 NULL, /* create main configuration */ | |
82 NULL, /* init main configuration */ | |
83 | |
84 NULL, /* create server configuration */ | |
85 NULL, /* merge server configuration */ | |
86 | |
87 ngx_http_realip_create_loc_conf, /* create location configuration */ | |
88 ngx_http_realip_merge_loc_conf /* merge location configuration */ | |
89 }; | |
90 | |
91 | |
92 ngx_module_t ngx_http_realip_module = { | |
93 NGX_MODULE_V1, | |
94 &ngx_http_realip_module_ctx, /* module context */ | |
95 ngx_http_realip_commands, /* module directives */ | |
96 NGX_HTTP_MODULE, /* module type */ | |
97 NULL, /* init master */ | |
681 | 98 NULL, /* init module */ |
573 | 99 NULL, /* init process */ |
100 NULL, /* init thread */ | |
101 NULL, /* exit thread */ | |
102 NULL, /* exit process */ | |
103 NULL, /* exit master */ | |
104 NGX_MODULE_V1_PADDING | |
105 }; | |
106 | |
107 | |
108 static ngx_int_t | |
109 ngx_http_realip_handler(ngx_http_request_t *r) | |
110 { | |
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111 u_char *p; |
573 | 112 size_t len; |
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113 ngx_str_t *value; |
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114 ngx_uint_t i, hash; |
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115 ngx_addr_t addr; |
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116 ngx_array_t *xfwd; |
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117 ngx_list_part_t *part; |
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118 ngx_table_elt_t *header; |
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119 ngx_connection_t *c; |
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120 ngx_http_realip_ctx_t *ctx; |
573 | 121 ngx_http_realip_loc_conf_t *rlcf; |
122 | |
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123 ctx = ngx_http_get_module_ctx(r, ngx_http_realip_module); |
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124 |
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125 if (ctx) { |
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126 return NGX_DECLINED; |
573 | 127 } |
128 | |
129 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_realip_module); | |
130 | |
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131 if (rlcf->from == NULL) { |
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132 return NGX_DECLINED; |
573 | 133 } |
134 | |
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135 switch (rlcf->type) { |
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136 |
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137 case NGX_HTTP_REALIP_XREALIP: |
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138 |
573 | 139 if (r->headers_in.x_real_ip == NULL) { |
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140 return NGX_DECLINED; |
573 | 141 } |
142 | |
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143 value = &r->headers_in.x_real_ip->value; |
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144 xfwd = NULL; |
573 | 145 |
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146 break; |
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147 |
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148 case NGX_HTTP_REALIP_XFWD: |
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149 |
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150 xfwd = &r->headers_in.x_forwarded_for; |
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151 |
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152 if (xfwd->elts == NULL) { |
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153 return NGX_DECLINED; |
573 | 154 } |
155 | |
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156 value = NULL; |
573 | 157 |
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158 break; |
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159 |
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160 case NGX_HTTP_REALIP_PROXY: |
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161 |
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162 value = &r->connection->proxy_protocol_addr; |
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163 |
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164 if (value->len == 0) { |
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165 return NGX_DECLINED; |
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166 } |
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167 |
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168 xfwd = NULL; |
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169 |
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170 break; |
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171 |
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172 default: /* NGX_HTTP_REALIP_HEADER */ |
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173 |
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174 part = &r->headers_in.headers.part; |
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175 header = part->elts; |
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176 |
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177 hash = rlcf->hash; |
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178 len = rlcf->header.len; |
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179 p = rlcf->header.data; |
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180 |
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181 for (i = 0; /* void */ ; i++) { |
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182 |
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183 if (i >= part->nelts) { |
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184 if (part->next == NULL) { |
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185 break; |
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186 } |
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187 |
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188 part = part->next; |
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189 header = part->elts; |
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190 i = 0; |
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191 } |
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192 |
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193 if (hash == header[i].hash |
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194 && len == header[i].key.len |
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195 && ngx_strncmp(p, header[i].lowcase_key, len) == 0) |
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196 { |
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197 value = &header[i].value; |
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198 xfwd = NULL; |
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199 |
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200 goto found; |
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201 } |
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202 } |
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203 |
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204 return NGX_DECLINED; |
573 | 205 } |
206 | |
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207 found: |
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208 |
2176
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209 c = r->connection; |
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210 |
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211 addr.sockaddr = c->sockaddr; |
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212 addr.socklen = c->socklen; |
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213 /* addr.name = c->addr_text; */ |
3274 | 214 |
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Correctly handle multiple X-Forwarded-For headers (ticket #106).
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|
215 if (ngx_http_get_forwarded_addr(r, &addr, xfwd, value, rlcf->from, |
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|
216 rlcf->recursive) |
5084
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Correctly handle multiple X-Forwarded-For headers (ticket #106).
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217 != NGX_DECLINED) |
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218 { |
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219 return ngx_http_realip_set_addr(r, &addr); |
3274 | 220 } |
221 | |
222 return NGX_DECLINED; | |
223 } | |
224 | |
573 | 225 |
3274 | 226 static ngx_int_t |
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227 ngx_http_realip_set_addr(ngx_http_request_t *r, ngx_addr_t *addr) |
3274 | 228 { |
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229 size_t len; |
3274 | 230 u_char *p; |
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231 u_char text[NGX_SOCKADDR_STRLEN]; |
3274 | 232 ngx_connection_t *c; |
233 ngx_pool_cleanup_t *cln; | |
234 ngx_http_realip_ctx_t *ctx; | |
573 | 235 |
3274 | 236 cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_http_realip_ctx_t)); |
237 if (cln == NULL) { | |
238 return NGX_HTTP_INTERNAL_SERVER_ERROR; | |
239 } | |
2176
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240 |
3274 | 241 ctx = cln->data; |
242 ngx_http_set_ctx(r, ctx, ngx_http_realip_module); | |
1114
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243 |
3274 | 244 c = r->connection; |
245 | |
5263
05ba5bce31e0
Core: extended ngx_sock_ntop() with socklen parameter.
Vladimir Homutov <vl@nginx.com>
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|
246 len = ngx_sock_ntop(addr->sockaddr, addr->socklen, text, |
05ba5bce31e0
Core: extended ngx_sock_ntop() with socklen parameter.
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247 NGX_SOCKADDR_STRLEN, 0); |
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248 if (len == 0) { |
3274 | 249 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
250 } | |
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251 |
3274 | 252 p = ngx_pnalloc(c->pool, len); |
253 if (p == NULL) { | |
254 return NGX_HTTP_INTERNAL_SERVER_ERROR; | |
255 } | |
1118
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256 |
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257 ngx_memcpy(p, text, len); |
2176
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258 |
3274 | 259 cln->handler = ngx_http_realip_cleanup; |
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260 |
3274 | 261 ctx->connection = c; |
262 ctx->sockaddr = c->sockaddr; | |
263 ctx->socklen = c->socklen; | |
264 ctx->addr_text = c->addr_text; | |
573 | 265 |
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266 c->sockaddr = addr->sockaddr; |
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267 c->socklen = addr->socklen; |
3274 | 268 c->addr_text.len = len; |
269 c->addr_text.data = p; | |
573 | 270 |
986
68c85f283043
ngx_http_realip_module must return NGX_DECLINED
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diff
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|
271 return NGX_DECLINED; |
573 | 272 } |
273 | |
274 | |
2176
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275 static void |
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276 ngx_http_realip_cleanup(void *data) |
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277 { |
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278 ngx_http_realip_ctx_t *ctx = data; |
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279 |
3273
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|
280 ngx_connection_t *c; |
2176
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281 |
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282 c = ctx->connection; |
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283 |
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|
284 c->sockaddr = ctx->sockaddr; |
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285 c->socklen = ctx->socklen; |
2176
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286 c->addr_text = ctx->addr_text; |
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287 } |
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288 |
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289 |
573 | 290 static char * |
291 ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
292 { | |
293 ngx_http_realip_loc_conf_t *rlcf = conf; | |
294 | |
2257
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295 ngx_int_t rc; |
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|
296 ngx_str_t *value; |
4624
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297 ngx_cidr_t *cidr; |
573 | 298 |
3274 | 299 value = cf->args->elts; |
300 | |
4624
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301 if (rlcf->from == NULL) { |
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|
302 rlcf->from = ngx_array_create(cf->pool, 2, |
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|
303 sizeof(ngx_cidr_t)); |
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304 if (rlcf->from == NULL) { |
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305 return NGX_CONF_ERROR; |
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306 } |
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307 } |
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|
308 |
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309 cidr = ngx_array_push(rlcf->from); |
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310 if (cidr == NULL) { |
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311 return NGX_CONF_ERROR; |
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312 } |
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313 |
3274 | 314 #if (NGX_HAVE_UNIX_DOMAIN) |
315 | |
316 if (ngx_strcmp(value[1].data, "unix:") == 0) { | |
4624
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317 cidr->family = AF_UNIX; |
3274 | 318 return NGX_CONF_OK; |
319 } | |
320 | |
321 #endif | |
322 | |
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323 rc = ngx_ptocidr(&value[1], cidr); |
1380
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|
324 |
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325 if (rc == NGX_ERROR) { |
573 | 326 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"", |
327 &value[1]); | |
328 return NGX_CONF_ERROR; | |
329 } | |
330 | |
1380
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331 if (rc == NGX_DONE) { |
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332 ngx_conf_log_error(NGX_LOG_WARN, cf, 0, |
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|
333 "low address bits of %V are meaningless", &value[1]); |
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334 } |
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335 |
573 | 336 return NGX_CONF_OK; |
337 } | |
338 | |
339 | |
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340 static char * |
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341 ngx_http_realip(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
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342 { |
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343 ngx_http_realip_loc_conf_t *rlcf = conf; |
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344 |
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345 ngx_str_t *value; |
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346 |
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347 value = cf->args->elts; |
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348 |
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349 if (ngx_strcmp(value[1].data, "X-Real-IP") == 0) { |
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350 rlcf->type = NGX_HTTP_REALIP_XREALIP; |
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351 return NGX_CONF_OK; |
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352 } |
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353 |
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354 if (ngx_strcmp(value[1].data, "X-Forwarded-For") == 0) { |
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355 rlcf->type = NGX_HTTP_REALIP_XFWD; |
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356 return NGX_CONF_OK; |
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357 } |
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|
358 |
5605
3a72b1805c52
Added server-side support for PROXY protocol v1 (ticket #355).
Roman Arutyunyan <arut@nginx.com>
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5263
diff
changeset
|
359 if (ngx_strcmp(value[1].data, "proxy_protocol") == 0) { |
3a72b1805c52
Added server-side support for PROXY protocol v1 (ticket #355).
Roman Arutyunyan <arut@nginx.com>
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5263
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|
360 rlcf->type = NGX_HTTP_REALIP_PROXY; |
3a72b1805c52
Added server-side support for PROXY protocol v1 (ticket #355).
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5263
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|
361 return NGX_CONF_OK; |
3a72b1805c52
Added server-side support for PROXY protocol v1 (ticket #355).
Roman Arutyunyan <arut@nginx.com>
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5263
diff
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|
362 } |
3a72b1805c52
Added server-side support for PROXY protocol v1 (ticket #355).
Roman Arutyunyan <arut@nginx.com>
parents:
5263
diff
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|
363 |
2257
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|
364 rlcf->type = NGX_HTTP_REALIP_HEADER; |
74d270c8821e
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|
365 rlcf->hash = ngx_hash_strlow(value[1].data, value[1].data, value[1].len); |
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366 rlcf->header = value[1]; |
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367 |
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368 return NGX_CONF_OK; |
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369 } |
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370 |
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371 |
573 | 372 static void * |
373 ngx_http_realip_create_loc_conf(ngx_conf_t *cf) | |
374 { | |
375 ngx_http_realip_loc_conf_t *conf; | |
376 | |
377 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_realip_loc_conf_t)); | |
378 if (conf == NULL) { | |
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379 return NULL; |
573 | 380 } |
381 | |
382 /* | |
383 * set by ngx_pcalloc(): | |
384 * | |
385 * conf->from = NULL; | |
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386 * conf->hash = 0; |
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387 * conf->header = { 0, NULL }; |
573 | 388 */ |
389 | |
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390 conf->type = NGX_CONF_UNSET_UINT; |
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391 conf->recursive = NGX_CONF_UNSET; |
573 | 392 |
393 return conf; | |
394 } | |
395 | |
396 | |
397 static char * | |
398 ngx_http_realip_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child) | |
399 { | |
400 ngx_http_realip_loc_conf_t *prev = parent; | |
401 ngx_http_realip_loc_conf_t *conf = child; | |
402 | |
403 if (conf->from == NULL) { | |
404 conf->from = prev->from; | |
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405 } |
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406 |
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407 ngx_conf_merge_uint_value(conf->type, prev->type, NGX_HTTP_REALIP_XREALIP); |
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408 ngx_conf_merge_value(conf->recursive, prev->recursive, 0); |
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409 |
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410 if (conf->header.len == 0) { |
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411 conf->hash = prev->hash; |
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412 conf->header = prev->header; |
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413 } |
573 | 414 |
415 return NGX_CONF_OK; | |
416 } | |
417 | |
418 | |
419 static ngx_int_t | |
681 | 420 ngx_http_realip_init(ngx_conf_t *cf) |
573 | 421 { |
422 ngx_http_handler_pt *h; | |
423 ngx_http_core_main_conf_t *cmcf; | |
424 | |
681 | 425 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); |
573 | 426 |
427 h = ngx_array_push(&cmcf->phases[NGX_HTTP_POST_READ_PHASE].handlers); | |
428 if (h == NULL) { | |
429 return NGX_ERROR; | |
430 } | |
431 | |
432 *h = ngx_http_realip_handler; | |
433 | |
581 | 434 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); |
573 | 435 if (h == NULL) { |
436 return NGX_ERROR; | |
437 } | |
438 | |
439 *h = ngx_http_realip_handler; | |
440 | |
441 return NGX_OK; | |
442 } |