ChinaDNS-C

Fix weird things with DNS in China. This is a port of ChinaDNS to C, especially for OpenWRT.

Install

• Linux / Unix

  Download a release.

    ./configure && make
    src/chinadns -l iplist.txt -c chnroute.txt
  

• OpenWRT

  • Download precompiled for OpenWRT trunk and CPU: ar71xx, brcm63xx, brcm47xx, ramips_24kec. Open an issue if you think your CPU is a popular one but not listed here.

  • If you use other CPU or other OpenWRT versions, build yourself: cd into SDK root, then

      pushd package
      git clone https://github.com/clowwindy/ChinaDNS-C.git
      popd
      make menuconfig # select Network/ChinaDNS
      make
    

• Tomoto

  • Download Tomato toolchain, build by yourself.

  • Uncompress the downloaded file to ~/.

  • Copy the brcm directory under ~/WRT54GL-US_v4.30.11_11/tools/ to /opt, then

      export PATH=/opt/brcm/hndtools-mipsel-uclibc/bin/:/opt/brcm/hndtools-mipsel-linux/bin/:$PATH
      git clone https://github.com/clowwindy/ChinaDNS-C.git
      cd ChinaDNS-C
      ./autogen.sh && ./configure --host=mipsel-linux --enable-static && make
    

• Windows

  Download Python exe version.

Usage

• Linux / Unix

  Run sudo chinadns -l iplist.txt on your local machine. ChinaDNS creates a UDP DNS Server at 0.0.0.0:53.

• OpenWRT

    opkg install ChinaDNS-C_1.x.x_ar71xx.ipk
    /etc/init.d/chinadns start
  

Test if it works correctly:

$ dig @192.168.1.1 www.youtube.com
Server:		192.168.1.1
Address:	192.168.1.1#53

Non-authoritative answer:
www.youtube.com	canonical name = youtube-ui.l.google.com.
youtube-ui.l.google.com	canonical name = youtube-ui-china.l.google.com.
Name:	youtube-ui-china.l.google.com
Address: 173.194.72.102
Name:	youtube-ui-china.l.google.com
Address: 173.194.72.101
Name:	youtube-ui-china.l.google.com
Address: 173.194.72.113
Name:	youtube-ui-china.l.google.com
Address: 173.194.72.100
Name:	youtube-ui-china.l.google.com
Address: 173.194.72.139
Name:	youtube-ui-china.l.google.com
Address: 173.194.72.138

Currently ChinaDNS-C only supports UDP. Builtin OpenWRT init script works with dnsmasq, which handles TCP. If you use it directly without dnsmasq, you need to add a redirect rule for TCP:

iptables -t nat -A PREROUTING -p tcp --dport 53 -j DNAT --to-destination 8.8.8.8:53

Advanced

usage: chinadns [-h] [-l IPLIST_FILE] [-b BIND_ADDR] [-p BIND_PORT]
       [-c CHNROUTE_FILE] [-s DNS] [-v]
Forward DNS requests.

-h, --help            show this help message and exit
-l IPLIST_FILE        path to ip blacklist file
-c CHNROUTE_FILE      path to china route file
                      if not specified, CHNRoute will be turned off
-b BIND_ADDR          address that listens, default: 127.0.0.1
-p BIND_PORT          port that listens, default: 53
-s DNS                DNS servers to use, default:
                      114.114.114.114,208.67.222.222,8.8.8.8
-v                    verbose logging

About chnroute

You can generate latest chnroute.txt using this command:

curl 'http://ftp.apnic.net/apnic/stats/apnic/delegated-apnic-latest' | grep ipv4 | grep CN | awk -F\| '{ printf("%s/%d\n", $4, 32-log($5)/log(2)) }' > chnroute.txt

License

MIT

Bugs and Issues

Please visit Issue Tracker

Mailing list: http://groups.google.com/group/shadowsocks