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RpiProxy

Make a Raspberry PI as a proxy route, work with shadowsocks server, provide clean dns/proxy service

前言:
  书籍是人类进步的阶梯,墙是阻碍人类进步的陷阱 --- 高尔基·马克西姆·方·滨兴

  翻墙的最佳姿势,当然是不在电脑/手机/pad上安装任何软件,不更改任何设置,就能访问到任何网址,墙变得透明了。 实现这个目标主要有两种做法:

  1. 刷路由器固件,用OpenWrt加上其它软件。这个方式适合爱折腾的玩家,也有上网不稳定的风险存在。
  2. 用一台专用电脑充当网关/DNS服务器,安装设置上专用软件。这种方式优点很多,还可以出差时随时携带。要说低成本电脑, 当然要首推树莓派了。本文就是专门介绍如何让树莓派做为透明翻墙网关。已经在Raspbian(Jiessie)和OSMC系统下面测试通过了。

说明:工作目录在/home/pi下面
说明:用su取得root权限,我下面的命令不再加sudo前缀
说明:我的安装配置都是按systemd系统的,较老的系统不适用

v2更新说明:本文的第一版写在2016年,这段时间内:
shadowsocks-libev升了很多版本,修正了一些bug,增加了更多的加密方式,用起来速度更快一些
chinadns已经停止维护很久了,ss-tunnel转发dns查询的模式也不太稳定,因此决定切换到overture上去
overture自带dns分流查询、TTL、缓存,因此个人使用也没必要安装dnsmasq了
整个架构就由shadowsocks-libev + overture构成,安装维护更简单了

系统架构图

1.1、安装shadowsocks-libev

   vps服务端的安装教程网上汗牛充栋,这里就不详述了
   但在树莓派上安装shadowsocks-libev最新版本却没那么容易,如果想自己编译安装,shadowsocks-libev的依赖库极多,
   又有版本要求,比较繁琐,推荐从Debian Backports上安装最新版本
       vi /etc/apt/sources.list
   jessie版本加这行:
deb http://ftp.debian.org/debian jessie-backports main
stretch版本加这行:
deb http://ftp.debian.org/debian stretch-backports main

   给这个源添加公钥,否则apt-get update会报错
apt-get install dirmngr

gpg --keyserver pgpkeys.mit.edu --recv-key  8B48AD6246925553    
gpg -a --export 8B48AD6246925553 | sudo apt-key add -    

gpg --keyserver pgpkeys.mit.edu --recv-key  7638D0442B90D010    
gpg -a --export 7638D0442B90D010 | sudo apt-key add -    

   apt-get update      stretch版本执行这句:
    apt-get install shadowsocks-libev -t jessie-backports
   jessie版本执行这句:
    apt-get install shadowsocks-libev -t stretch-backports

1.2、禁用shadowsocks-libev-server服务,这个服务默认是打开的

systemctl stop shadowsocks-libev.service
systemctl disable shadowsocks-libev.service

1.3、配置启动shadowsocks-libev-redir服务

   vi /etc/shadowsocks-libev/ss-redir.json
格式如下:
{
"server":"境外shadowsocks服务器ip地址",
"server_port":境外shadowsocks服务器端口,
"local_address": "0.0.0.0",
"local_port":8888,
"password":"境外shadowsocks服务密码",
"timeout":3000,
"method":"chacha20-ietf-poly1305"
}

mv /lib/systemd/system/shadowsocks-libev-redir@.service /lib/systemd/system/shadowsocks-libev-redir.service  
vi /lib/systemd/system/shadowsocks-libev-redir.service  
注意这行:ExecStart=/usr/bin/ss-redir -c /etc/shadowsocks-libev/ss-redir.json  
systemctl daemon-reload  
systemctl enable shadowsocks-libev-redir  
systemctl start shadowsocks-libev-redir  
用下面这句检查运行状态  
systemctl status shadowsocks-libev-redir  

1.4、配置启动shadowsocks-libev-local服务

   注意:ss-redir是透明代理(转发)服务,ss-local是socket5转发服务,这个不同需要很清楚
         在本文中,8888端口用于透明代理,1080端口用于socket5转发
         ss-local给overture使用,用于向境外dns服务器查询

   cp /etc/shadowsocks-libev/ss-redir.json /etc/shadowsocks-libev/ss-local.json
vi /etc/shadowsocks-libev/ss-local.json
{
"server":"境外shadowsocks服务器ip地址",
"server_port":境外shadowsocks服务器端口,
"local_address": "127.0.0.1",
"local_port":1080,
"password":"境外shadowsocks服务密码",
"timeout":3000,
"method":"chacha20-ietf-poly1305"
}
mv /lib/systemd/system/shadowsocks-libev-local@.service /lib/systemd/system/shadowsocks-libev-local.service
vi /lib/systemd/system/shadowsocks-libev-local.service
注意这行:ExecStart=/usr/bin/ss-local -c /etc/shadowsocks-libev/ss-local.json
systemctl daemon-reload
systemctl enable shadowsocks-libev-local
systemctl start shadowsocks-libev-local
用下面这句检查运行状态
systemctl status shadowsocks-libev-local

2.1、设置nat转发规则

vi /etc/sysctl.conf
注意这句:net.ipv4.ip_forward = 1
sysctl -p
下载本项目文件/etc/shadowsocks-libev/iptables.up.rules
修改你自己的Shadowsocks服务器ip
vi /etc/network/if-pre-up.d/iptables
    #!/bin/bash
    /sbin/iptables-restore < /etc/shadowsocks-libev/iptables.up.rules
chmod +x /etc/network/if-pre-up.d/iptables

**注意:raspberry PI的发行版本OSMC中,不支持网络接口链接/断开脚本,做为临时办法,放到rc.local中执行

3.1、安装配置启动overture服务

   到https://github.com/shawn1m/overture 下载安装,我的配置如下:
   {
"BindAddress": ":53",
"PrimaryDNS": [
{
"Name": "aliDNS",
"Address": "223.5.5.5:53",
"Protocol": "udp",
"SOCKS5Address": "",
"Timeout": 6,
"EDNSClientSubnet": {
"Policy": "disable",
"ExternalIP": ""
}
}
],
"AlternativeDNS": [
{
"Name": "googleDNS",
"Address": "8.8.8.8:53",
"Protocol": "tcp",
"SOCKS5Address": "127.0.0.1:1080",
"Timeout": 6,
"EDNSClientSubnet": {
"Policy": "disable",
"ExternalIP": ""
}
}
],
"OnlyPrimaryDNS": false,
"RedirectIPv6Record": false,
"IPNetworkFile": "/etc/shadowsocks-libev/china_ip_list.txt",
"DomainFile": "/etc/shadowsocks-libev/gfwlist.txt",
"DomainBase64Decode": true,
"HostsFile": "/usr/bin/overture/hosts_sample",
"MinimumTTL": 86400,
"CacheSize" : 604800,
"RejectQtype": [255]
}

   注意:境外辅助dns服务器需要支持tcp,走socket5代理模式
   配置中指定的地址段china_ip_list,域名单gfwlist,都是众所周知的github项目,可自行下载,本项目内也有提供
   接下来配置为自动启动的服务:

   vi /lib/systemd/system/overture.service
格式如下:
[Unit] Description=overture service

[Service]
ExecStart=/usr/bin/overture/overture-linux-arm -c /etc/shadowsocks-libev/overture.json
Restart=on-failure
RestartSec=42s

[Install]
WantedBy=multi-user.target

systemctl daemon-reload
systemctl enable overture
systemctl start overture
用下面这句检查运行状态
systemctl status overture

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