Mercurial > hg > nginx
annotate src/http/modules/ngx_http_realip_module.c @ 6986:0cdee26605f3
Cleaned up r->headers_out.headers allocation error handling.
If initialization of a header failed for some reason after ngx_list_push(),
leaving the header as is can result in uninitialized memory access by
the header filter or the log module. The fix is to clear partially
initialized headers in case of errors.
For the Cache-Control header, the fix is to postpone pushing
r->headers_out.cache_control until its value is completed.
author | Sergey Kandaurov <pluknet@nginx.com> |
---|---|
date | Thu, 20 Apr 2017 18:26:37 +0300 |
parents | cecf415643d7 |
children | df1a62c83b1b |
rev | line source |
---|---|
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); | |
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46 static ngx_int_t ngx_http_realip_add_variables(ngx_conf_t *cf); |
681 | 47 static ngx_int_t ngx_http_realip_init(ngx_conf_t *cf); |
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48 static ngx_http_realip_ctx_t *ngx_http_realip_get_module_ctx( |
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49 ngx_http_request_t *r); |
573 | 50 |
51 | |
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52 static ngx_int_t ngx_http_realip_remote_addr_variable(ngx_http_request_t *r, |
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53 ngx_http_variable_value_t *v, uintptr_t data); |
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54 static ngx_int_t ngx_http_realip_remote_port_variable(ngx_http_request_t *r, |
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55 ngx_http_variable_value_t *v, uintptr_t data); |
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56 |
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57 |
573 | 58 static ngx_command_t ngx_http_realip_commands[] = { |
59 | |
60 { ngx_string("set_real_ip_from"), | |
61 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
62 ngx_http_realip_from, | |
63 NGX_HTTP_LOC_CONF_OFFSET, | |
64 0, | |
65 NULL }, | |
66 | |
67 { ngx_string("real_ip_header"), | |
68 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
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69 ngx_http_realip, |
573 | 70 NGX_HTTP_LOC_CONF_OFFSET, |
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71 0, |
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72 NULL }, |
573 | 73 |
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74 { ngx_string("real_ip_recursive"), |
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75 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG, |
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76 ngx_conf_set_flag_slot, |
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77 NGX_HTTP_LOC_CONF_OFFSET, |
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78 offsetof(ngx_http_realip_loc_conf_t, recursive), |
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79 NULL }, |
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80 |
573 | 81 ngx_null_command |
82 }; | |
83 | |
84 | |
85 | |
667 | 86 static ngx_http_module_t ngx_http_realip_module_ctx = { |
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87 ngx_http_realip_add_variables, /* preconfiguration */ |
681 | 88 ngx_http_realip_init, /* postconfiguration */ |
573 | 89 |
90 NULL, /* create main configuration */ | |
91 NULL, /* init main configuration */ | |
92 | |
93 NULL, /* create server configuration */ | |
94 NULL, /* merge server configuration */ | |
95 | |
96 ngx_http_realip_create_loc_conf, /* create location configuration */ | |
97 ngx_http_realip_merge_loc_conf /* merge location configuration */ | |
98 }; | |
99 | |
100 | |
101 ngx_module_t ngx_http_realip_module = { | |
102 NGX_MODULE_V1, | |
103 &ngx_http_realip_module_ctx, /* module context */ | |
104 ngx_http_realip_commands, /* module directives */ | |
105 NGX_HTTP_MODULE, /* module type */ | |
106 NULL, /* init master */ | |
681 | 107 NULL, /* init module */ |
573 | 108 NULL, /* init process */ |
109 NULL, /* init thread */ | |
110 NULL, /* exit thread */ | |
111 NULL, /* exit process */ | |
112 NULL, /* exit master */ | |
113 NGX_MODULE_V1_PADDING | |
114 }; | |
115 | |
116 | |
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117 static ngx_http_variable_t ngx_http_realip_vars[] = { |
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118 |
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119 { ngx_string("realip_remote_addr"), NULL, |
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120 ngx_http_realip_remote_addr_variable, 0, 0, 0 }, |
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121 |
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122 { ngx_string("realip_remote_port"), NULL, |
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123 ngx_http_realip_remote_port_variable, 0, 0, 0 }, |
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124 |
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125 { ngx_null_string, NULL, NULL, 0, 0, 0 } |
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126 }; |
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127 |
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128 |
573 | 129 static ngx_int_t |
130 ngx_http_realip_handler(ngx_http_request_t *r) | |
131 { | |
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132 u_char *p; |
573 | 133 size_t len; |
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134 ngx_str_t *value; |
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135 ngx_uint_t i, hash; |
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136 ngx_addr_t addr; |
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137 ngx_array_t *xfwd; |
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138 ngx_list_part_t *part; |
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139 ngx_table_elt_t *header; |
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140 ngx_connection_t *c; |
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141 ngx_http_realip_ctx_t *ctx; |
573 | 142 ngx_http_realip_loc_conf_t *rlcf; |
143 | |
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144 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_realip_module); |
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145 |
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146 if (rlcf->from == NULL) { |
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147 return NGX_DECLINED; |
573 | 148 } |
149 | |
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150 ctx = ngx_http_realip_get_module_ctx(r); |
573 | 151 |
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152 if (ctx) { |
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153 return NGX_DECLINED; |
573 | 154 } |
155 | |
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156 switch (rlcf->type) { |
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157 |
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158 case NGX_HTTP_REALIP_XREALIP: |
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159 |
573 | 160 if (r->headers_in.x_real_ip == NULL) { |
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161 return NGX_DECLINED; |
573 | 162 } |
163 | |
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164 value = &r->headers_in.x_real_ip->value; |
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165 xfwd = NULL; |
573 | 166 |
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167 break; |
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168 |
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169 case NGX_HTTP_REALIP_XFWD: |
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170 |
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171 xfwd = &r->headers_in.x_forwarded_for; |
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172 |
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173 if (xfwd->elts == NULL) { |
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174 return NGX_DECLINED; |
573 | 175 } |
176 | |
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177 value = NULL; |
573 | 178 |
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179 break; |
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180 |
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181 case NGX_HTTP_REALIP_PROXY: |
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182 |
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183 value = &r->connection->proxy_protocol_addr; |
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184 |
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185 if (value->len == 0) { |
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186 return NGX_DECLINED; |
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Added server-side support for PROXY protocol v1 (ticket #355).
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187 } |
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188 |
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Added server-side support for PROXY protocol v1 (ticket #355).
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189 xfwd = NULL; |
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Added server-side support for PROXY protocol v1 (ticket #355).
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190 |
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Added server-side support for PROXY protocol v1 (ticket #355).
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191 break; |
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192 |
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193 default: /* NGX_HTTP_REALIP_HEADER */ |
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194 |
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195 part = &r->headers_in.headers.part; |
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196 header = part->elts; |
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197 |
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198 hash = rlcf->hash; |
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199 len = rlcf->header.len; |
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200 p = rlcf->header.data; |
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201 |
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202 for (i = 0; /* void */ ; i++) { |
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203 |
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204 if (i >= part->nelts) { |
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205 if (part->next == NULL) { |
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206 break; |
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207 } |
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208 |
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209 part = part->next; |
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210 header = part->elts; |
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211 i = 0; |
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212 } |
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213 |
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214 if (hash == header[i].hash |
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215 && len == header[i].key.len |
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216 && ngx_strncmp(p, header[i].lowcase_key, len) == 0) |
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217 { |
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218 value = &header[i].value; |
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219 xfwd = NULL; |
2257
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220 |
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221 goto found; |
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222 } |
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223 } |
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224 |
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225 return NGX_DECLINED; |
573 | 226 } |
227 | |
2257
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228 found: |
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229 |
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230 c = r->connection; |
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231 |
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232 addr.sockaddr = c->sockaddr; |
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233 addr.socklen = c->socklen; |
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234 /* addr.name = c->addr_text; */ |
3274 | 235 |
5084
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236 if (ngx_http_get_forwarded_addr(r, &addr, xfwd, value, rlcf->from, |
4624
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|
237 rlcf->recursive) |
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Correctly handle multiple X-Forwarded-For headers (ticket #106).
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|
238 != NGX_DECLINED) |
4624
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239 { |
6563
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Realip: take client port from PROXY protocol header.
Dmitry Volyntsev <xeioex@nginx.com>
parents:
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diff
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|
240 if (rlcf->type == NGX_HTTP_REALIP_PROXY) { |
6593
b3b7e33083ac
Introduced ngx_inet_get_port() and ngx_inet_set_port() functions.
Roman Arutyunyan <arut@nginx.com>
parents:
6565
diff
changeset
|
241 ngx_inet_set_port(addr.sockaddr, c->proxy_protocol_port); |
6563
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|
242 } |
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|
243 |
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244 return ngx_http_realip_set_addr(r, &addr); |
3274 | 245 } |
246 | |
247 return NGX_DECLINED; | |
248 } | |
249 | |
573 | 250 |
3274 | 251 static ngx_int_t |
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252 ngx_http_realip_set_addr(ngx_http_request_t *r, ngx_addr_t *addr) |
3274 | 253 { |
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254 size_t len; |
3274 | 255 u_char *p; |
4624
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|
256 u_char text[NGX_SOCKADDR_STRLEN]; |
3274 | 257 ngx_connection_t *c; |
258 ngx_pool_cleanup_t *cln; | |
259 ngx_http_realip_ctx_t *ctx; | |
573 | 260 |
3274 | 261 cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_http_realip_ctx_t)); |
262 if (cln == NULL) { | |
263 return NGX_HTTP_INTERNAL_SERVER_ERROR; | |
264 } | |
2176
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265 |
3274 | 266 ctx = cln->data; |
1114
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fix broken values, debug logging, and style fix
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diff
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|
267 |
3274 | 268 c = r->connection; |
269 | |
5263
05ba5bce31e0
Core: extended ngx_sock_ntop() with socklen parameter.
Vladimir Homutov <vl@nginx.com>
parents:
5084
diff
changeset
|
270 len = ngx_sock_ntop(addr->sockaddr, addr->socklen, text, |
05ba5bce31e0
Core: extended ngx_sock_ntop() with socklen parameter.
Vladimir Homutov <vl@nginx.com>
parents:
5084
diff
changeset
|
271 NGX_SOCKADDR_STRLEN, 0); |
4624
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272 if (len == 0) { |
3274 | 273 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
274 } | |
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275 |
3274 | 276 p = ngx_pnalloc(c->pool, len); |
277 if (p == NULL) { | |
278 return NGX_HTTP_INTERNAL_SERVER_ERROR; | |
279 } | |
1118
cec2866f29bd
a client address must be allocated from a connection pool
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|
280 |
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281 ngx_memcpy(p, text, len); |
2176
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282 |
3274 | 283 cln->handler = ngx_http_realip_cleanup; |
6671
6b1b8c4b7a95
Realip: fixed uninitialized memory access.
Roman Arutyunyan <arut@nginx.com>
parents:
6593
diff
changeset
|
284 ngx_http_set_ctx(r, ctx, ngx_http_realip_module); |
2176
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285 |
3274 | 286 ctx->connection = c; |
287 ctx->sockaddr = c->sockaddr; | |
288 ctx->socklen = c->socklen; | |
289 ctx->addr_text = c->addr_text; | |
573 | 290 |
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291 c->sockaddr = addr->sockaddr; |
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|
292 c->socklen = addr->socklen; |
3274 | 293 c->addr_text.len = len; |
294 c->addr_text.data = p; | |
573 | 295 |
986
68c85f283043
ngx_http_realip_module must return NGX_DECLINED
Igor Sysoev <igor@sysoev.ru>
parents:
681
diff
changeset
|
296 return NGX_DECLINED; |
573 | 297 } |
298 | |
299 | |
2176
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diff
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|
300 static void |
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|
301 ngx_http_realip_cleanup(void *data) |
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302 { |
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|
303 ngx_http_realip_ctx_t *ctx = data; |
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|
304 |
3273
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|
305 ngx_connection_t *c; |
2176
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306 |
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|
307 c = ctx->connection; |
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|
308 |
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|
309 c->sockaddr = ctx->sockaddr; |
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310 c->socklen = ctx->socklen; |
2176
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311 c->addr_text = ctx->addr_text; |
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312 } |
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313 |
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314 |
573 | 315 static char * |
316 ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
317 { | |
318 ngx_http_realip_loc_conf_t *rlcf = conf; | |
319 | |
2257
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|
320 ngx_int_t rc; |
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diff
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|
321 ngx_str_t *value; |
4624
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|
322 ngx_cidr_t *cidr; |
573 | 323 |
3274 | 324 value = cf->args->elts; |
325 | |
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|
326 if (rlcf->from == NULL) { |
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|
327 rlcf->from = ngx_array_create(cf->pool, 2, |
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|
328 sizeof(ngx_cidr_t)); |
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|
329 if (rlcf->from == NULL) { |
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|
330 return NGX_CONF_ERROR; |
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|
331 } |
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|
332 } |
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|
333 |
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|
334 cidr = ngx_array_push(rlcf->from); |
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|
335 if (cidr == NULL) { |
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|
336 return NGX_CONF_ERROR; |
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|
337 } |
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|
338 |
3274 | 339 #if (NGX_HAVE_UNIX_DOMAIN) |
340 | |
341 if (ngx_strcmp(value[1].data, "unix:") == 0) { | |
6474 | 342 cidr->family = AF_UNIX; |
343 return NGX_CONF_OK; | |
3274 | 344 } |
345 | |
346 #endif | |
347 | |
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|
348 rc = ngx_ptocidr(&value[1], cidr); |
1380
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|
349 |
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|
350 if (rc == NGX_ERROR) { |
573 | 351 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"", |
352 &value[1]); | |
353 return NGX_CONF_ERROR; | |
354 } | |
355 | |
1380
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|
356 if (rc == NGX_DONE) { |
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357 ngx_conf_log_error(NGX_LOG_WARN, cf, 0, |
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358 "low address bits of %V are meaningless", &value[1]); |
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359 } |
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360 |
573 | 361 return NGX_CONF_OK; |
362 } | |
363 | |
364 | |
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365 static char * |
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366 ngx_http_realip(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
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367 { |
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368 ngx_http_realip_loc_conf_t *rlcf = conf; |
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369 |
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370 ngx_str_t *value; |
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371 |
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372 if (rlcf->type != NGX_CONF_UNSET_UINT) { |
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373 return "is duplicate"; |
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374 } |
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375 |
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376 value = cf->args->elts; |
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377 |
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378 if (ngx_strcmp(value[1].data, "X-Real-IP") == 0) { |
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379 rlcf->type = NGX_HTTP_REALIP_XREALIP; |
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380 return NGX_CONF_OK; |
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381 } |
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382 |
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383 if (ngx_strcmp(value[1].data, "X-Forwarded-For") == 0) { |
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384 rlcf->type = NGX_HTTP_REALIP_XFWD; |
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385 return NGX_CONF_OK; |
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386 } |
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387 |
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Added server-side support for PROXY protocol v1 (ticket #355).
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388 if (ngx_strcmp(value[1].data, "proxy_protocol") == 0) { |
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389 rlcf->type = NGX_HTTP_REALIP_PROXY; |
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390 return NGX_CONF_OK; |
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391 } |
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392 |
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393 rlcf->type = NGX_HTTP_REALIP_HEADER; |
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394 rlcf->hash = ngx_hash_strlow(value[1].data, value[1].data, value[1].len); |
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395 rlcf->header = value[1]; |
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396 |
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397 return NGX_CONF_OK; |
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398 } |
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399 |
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400 |
573 | 401 static void * |
402 ngx_http_realip_create_loc_conf(ngx_conf_t *cf) | |
403 { | |
404 ngx_http_realip_loc_conf_t *conf; | |
405 | |
406 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_realip_loc_conf_t)); | |
407 if (conf == NULL) { | |
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408 return NULL; |
573 | 409 } |
410 | |
411 /* | |
412 * set by ngx_pcalloc(): | |
413 * | |
414 * conf->from = NULL; | |
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415 * conf->hash = 0; |
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416 * conf->header = { 0, NULL }; |
573 | 417 */ |
418 | |
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419 conf->type = NGX_CONF_UNSET_UINT; |
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420 conf->recursive = NGX_CONF_UNSET; |
573 | 421 |
422 return conf; | |
423 } | |
424 | |
425 | |
426 static char * | |
427 ngx_http_realip_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child) | |
428 { | |
429 ngx_http_realip_loc_conf_t *prev = parent; | |
430 ngx_http_realip_loc_conf_t *conf = child; | |
431 | |
432 if (conf->from == NULL) { | |
433 conf->from = prev->from; | |
3305
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434 } |
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435 |
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436 ngx_conf_merge_uint_value(conf->type, prev->type, NGX_HTTP_REALIP_XREALIP); |
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437 ngx_conf_merge_value(conf->recursive, prev->recursive, 0); |
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438 |
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439 if (conf->header.len == 0) { |
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440 conf->hash = prev->hash; |
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441 conf->header = prev->header; |
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442 } |
573 | 443 |
444 return NGX_CONF_OK; | |
445 } | |
446 | |
447 | |
448 static ngx_int_t | |
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449 ngx_http_realip_add_variables(ngx_conf_t *cf) |
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450 { |
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451 ngx_http_variable_t *var, *v; |
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452 |
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453 for (v = ngx_http_realip_vars; v->name.len; v++) { |
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454 var = ngx_http_add_variable(cf, &v->name, v->flags); |
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455 if (var == NULL) { |
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456 return NGX_ERROR; |
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|
457 } |
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|
458 |
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|
459 var->get_handler = v->get_handler; |
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|
460 var->data = v->data; |
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|
461 } |
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|
462 |
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|
463 return NGX_OK; |
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|
464 } |
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|
465 |
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|
466 |
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|
467 static ngx_int_t |
681 | 468 ngx_http_realip_init(ngx_conf_t *cf) |
573 | 469 { |
470 ngx_http_handler_pt *h; | |
471 ngx_http_core_main_conf_t *cmcf; | |
472 | |
681 | 473 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); |
573 | 474 |
475 h = ngx_array_push(&cmcf->phases[NGX_HTTP_POST_READ_PHASE].handlers); | |
476 if (h == NULL) { | |
477 return NGX_ERROR; | |
478 } | |
479 | |
480 *h = ngx_http_realip_handler; | |
481 | |
581 | 482 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); |
573 | 483 if (h == NULL) { |
484 return NGX_ERROR; | |
485 } | |
486 | |
487 *h = ngx_http_realip_handler; | |
488 | |
489 return NGX_OK; | |
490 } | |
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changeset
|
491 |
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changeset
|
492 |
6562
b13d3a6f0512
Added the $realip_remote_port variable.
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diff
changeset
|
493 static ngx_http_realip_ctx_t * |
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diff
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|
494 ngx_http_realip_get_module_ctx(ngx_http_request_t *r) |
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|
495 { |
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|
496 ngx_pool_cleanup_t *cln; |
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|
497 ngx_http_realip_ctx_t *ctx; |
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|
498 |
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diff
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|
499 ctx = ngx_http_get_module_ctx(r, ngx_http_realip_module); |
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|
500 |
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|
501 if (ctx == NULL && (r->internal || r->filter_finalize)) { |
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|
502 |
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|
503 /* |
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|
504 * if module context was reset, the original address |
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diff
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|
505 * can still be found in the cleanup handler |
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|
506 */ |
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diff
changeset
|
507 |
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diff
changeset
|
508 for (cln = r->pool->cleanup; cln; cln = cln->next) { |
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diff
changeset
|
509 if (cln->handler == ngx_http_realip_cleanup) { |
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diff
changeset
|
510 ctx = cln->data; |
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diff
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|
511 break; |
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|
512 } |
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|
513 } |
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diff
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|
514 } |
cebe43bace93
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diff
changeset
|
515 |
6562
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Added the $realip_remote_port variable.
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diff
changeset
|
516 return ctx; |
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Added the $realip_remote_port variable.
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diff
changeset
|
517 } |
b13d3a6f0512
Added the $realip_remote_port variable.
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diff
changeset
|
518 |
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Added the $realip_remote_port variable.
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diff
changeset
|
519 |
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Added the $realip_remote_port variable.
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6474
diff
changeset
|
520 static ngx_int_t |
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6474
diff
changeset
|
521 ngx_http_realip_remote_addr_variable(ngx_http_request_t *r, |
b13d3a6f0512
Added the $realip_remote_port variable.
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diff
changeset
|
522 ngx_http_variable_value_t *v, uintptr_t data) |
b13d3a6f0512
Added the $realip_remote_port variable.
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6474
diff
changeset
|
523 { |
b13d3a6f0512
Added the $realip_remote_port variable.
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524 ngx_str_t *addr_text; |
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525 ngx_http_realip_ctx_t *ctx; |
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526 |
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527 ctx = ngx_http_realip_get_module_ctx(r); |
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528 |
6294
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Realip: the $realip_remote_addr variable.
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529 addr_text = ctx ? &ctx->addr_text : &r->connection->addr_text; |
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530 |
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531 v->len = addr_text->len; |
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532 v->valid = 1; |
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533 v->no_cacheable = 0; |
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534 v->not_found = 0; |
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535 v->data = addr_text->data; |
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536 |
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537 return NGX_OK; |
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538 } |
6562
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539 |
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540 |
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541 static ngx_int_t |
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542 ngx_http_realip_remote_port_variable(ngx_http_request_t *r, |
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543 ngx_http_variable_value_t *v, uintptr_t data) |
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544 { |
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545 ngx_uint_t port; |
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546 struct sockaddr *sa; |
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547 ngx_http_realip_ctx_t *ctx; |
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548 |
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549 ctx = ngx_http_realip_get_module_ctx(r); |
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550 |
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551 sa = ctx ? ctx->sockaddr : r->connection->sockaddr; |
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552 |
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553 v->len = 0; |
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554 v->valid = 1; |
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555 v->no_cacheable = 0; |
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Added the $realip_remote_port variable.
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556 v->not_found = 0; |
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557 |
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558 v->data = ngx_pnalloc(r->pool, sizeof("65535") - 1); |
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559 if (v->data == NULL) { |
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560 return NGX_ERROR; |
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561 } |
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562 |
6593
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Introduced ngx_inet_get_port() and ngx_inet_set_port() functions.
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563 port = ngx_inet_get_port(sa); |
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564 |
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565 if (port > 0 && port < 65536) { |
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566 v->len = ngx_sprintf(v->data, "%ui", port) - v->data; |
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567 } |
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568 |
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569 return NGX_OK; |
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570 } |