nginx的抓取客户端真实IP的判断脚本

root@nginx-01:/usr/local/nginx/conf/# cat proxyheader.conf 
if ( $proxy_add_x_forwarded_for ~ "^([0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3})(.*)" ) {
    set $realip $1;
}
if ( $proxy_add_x_forwarded_for !~ "^([0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3})(.*)" ) {
    set $realip $remote_addr;
}
if ( $http_ali_cdn_real_ip ~ "^([0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3})" ) {
    set $realip $http_ali_cdn_real_ip;
}

nginx.conf中定义以下变量: 
    proxy_set_header Host $host;
    proxy_set_header acc_token $http_acc_token;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Real-IP $remote_addr;