redsocks - 代理所有流量 - use redsocks to proxy all traffic

在 Linux 平台，shadowsocks-qt5 并不强大，不能代理所有流量，我在搭建 Macaca 环境的时候，就遇到 selenium-standalone install 无法顺利完成的问题，即使设置了代理也无济于事，幸好我们还有 redsocks，它可以代理所有流量到指定端口。

首先，我们需要安装 redsocks ，这个请自行解决啊，我使用 Manjaro，打开 添加/删除软件 搜索下就OK了，下面，我们配置它。

sudo vim /etc/redsocks.conf

base {
  // debug: connection progress & client list on SIGUSR1
  log_debug = off;

  // info: start and end of client session
  log_info = off;

  /* possible `log' values are:
   *   stderr
   *   "file:/path/to/file"
   *   syslog:FACILITY  facility is any of "daemon", "local0"..."local7"
   */
  // log = stderr;
  // log = "file:/path/to/file";
  log = "syslog:daemon";

  // detach from console
  daemon = on;

  /* Change uid, gid and root directory, these options require root
   * privilegies on startup.
   * Note, your chroot may requre /etc/localtime if you write log to syslog.
   * Log is opened before chroot & uid changing.
   */
  user = redsocks;
  group = redsocks;
  // chroot = "/var/chroot";

  /* possible `redirector' values are:
   *   iptables   - for Linux
   *   ipf        - for FreeBSD
   *   pf         - for OpenBSD
   *   generic    - some generic redirector that MAY work
   */
  redirector = iptables;
}

redsocks {
  /* `local_ip' defaults to 127.0.0.1 for security reasons,
   * use 0.0.0.0 if you want to listen on every interface.
   * `local_*' are used as port to redirect to.
   */
  local_ip = 127.0.0.1;
  local_port = 31338;

  // listen() queue length. Default value is SOMAXCONN and it should be
  // good enough for most of us.
  // listenq = 128; // SOMAXCONN equals 128 on my Linux box.

  // `max_accept_backoff` is a delay to retry `accept()` after accept
  // failure (e.g. due to lack of file descriptors). It's measured in
  // milliseconds and maximal value is 65535. `min_accept_backoff` is
  // used as initial backoff value and as a damper for `accept() after
  // close()` logic.
  // min_accept_backoff = 100;
  // max_accept_backoff = 60000;

  // `ip' and `port' are IP and tcp-port of proxy-server
  // You can also use hostname instead of IP, only one (random)
  // address of multihomed host will be used.
  ip = 127.0.0.1;
  port = 1080;


  // known types: socks4, socks5, http-connect, http-relay
  type = socks5;

  // login = "foobar";
  // password = "baz";
}

redudp {
  // `local_ip' should not be 0.0.0.0 as it's also used for outgoing
  // packets that are sent as replies - and it should be fixed
  // if we want NAT to work properly.
  local_ip = 127.0.0.1;
  local_port = 10053;

  // `ip' and `port' of socks5 proxy server.
  ip = 127.0.0.1;
  port = 1080;

  // login = username;
  // password = pazzw0rd;

  // kernel does not give us this information, so we have to duplicate it
  // in both iptables rules and configuration file.  By the way, you can
  // set `local_ip' to 127.45.67.89 if you need more than 65535 ports to
  // forward ;-)
  // This limitation may be relaxed in future versions using contrack-tools.
  dest_ip = 8.8.8.8;
  dest_port = 53;

  udp_timeout = 30;
  udp_timeout_stream = 180;
}

dnstc {
  // fake and really dumb DNS server that returns "truncated answer" to
  // every query via UDP, RFC-compliant resolver should repeat same query
  // via TCP in this case.
  local_ip = 127.0.0.1;
  local_port = 5300;
}

// you can add more `redsocks' and `redudp' sections if you need.

主要修改 redsocks 节点下面的 ip、port、port 以及 redudp 节点下面的 ip 和 port，然后配置信息就OK了，但是还需要配置 iptables 规则，以下是我的规则：

1、proxy

sudo iptables -t nat -A OUTPUT -d xxx.xxx.xxx.xxx -j RETURN
sudo iptables -t nat -A OUTPUT -d 10.0.0.0/8 -j RETURN
sudo iptables -t nat -A OUTPUT -d 172.16.0.0/16 -j RETURN
sudo iptables -t nat -A OUTPUT -d 192.168.0.0/16 -j RETURN
sudo iptables -t nat -A OUTPUT -d 127.0.0.0/8 -j RETURN
sudo iptables -t nat -A OUTPUT -p tcp -j REDIRECT --to-ports 31338

这里注意两点，第一行的 xxx.xxx.xxx.xxx 改为你代理服务器的ip，即 shadowsocks 服务器的 ip，保证这个 ip 不被代理，否则死循环了，最后一行的 31338 需要和 redsocks 节点下面的 local_port 一致。你可以将以上规则保存为 proxy 并保存到 /usr/local/bin/目录下面，然后 sudo chmod a+x /usr/local/bin/proxy 之后就可以通过 proxy 来设置为全局代理了。那么，如何取消呢？

2、del_proxy

#/bin/bash
sudo iptables -t nat -D OUTPUT 6
sudo iptables -t nat -D OUTPUT 5
sudo iptables -t nat -D OUTPUT 4
sudo iptables -t nat -D OUTPUT 3
sudo iptables -t nat -D OUTPUT 2
sudo iptables -t nat -D OUTPUT 1

同样的，保存到 /usr/local/bin/ 目录下面，并 sudo chmod a+x /usr/local/bin/del_proxy 之后可以通过 del_proxy 来取消全局代理了。但是记得 sudo systemctl start redsocks 以及 sudo systemctl enable redsocks 哦！