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

If you want to fix other weird things as well, you might also want to use ShadowVPN.

• 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.git
      popd
      make menuconfig # select Network/ChinaDNS
      # Optional
      make -j
      make V=99 package/ChinaDNS/openwrt/compile
    

• 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.git
      cd ChinaDNS
      ./autogen.sh && ./configure --host=mipsel-linux --enable-static && make
    

• Windows

  Download Python exe version.

• 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_1.x.x_ar71xx.ipk
    /etc/init.d/chinadns start
  

  (Optional) We strongly recommend you to set ChinaDNS as a upstream DNS server for dnsmasq instead of using ChinaDNS directly:

  1. Run /etc/init.d/chinadns stop

  2. Remove the 2 lines containing iptables in /etc/init.d/chinadns.

  3. Update /etc/dnsmasq.conf to use only 127.0.0.1#5353:

      no-resolv
      server=127.0.0.1#5353
     

  4. Restart chinadns and dnsmasq

Test if it works correctly:

$ dig @192.168.1.1 www.youtube.com -p5353
; <<>> DiG 9.8.3-P1 <<>> @127.0.0.1 www.google.com -p5353
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 16179
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;www.google.com.            IN  A

;; ANSWER SECTION:
www.google.com.     215 IN  A   173.194.127.50
www.google.com.     215 IN  A   173.194.127.49
www.google.com.     215 IN  A   173.194.127.48
www.google.com.     215 IN  A   173.194.127.52
www.google.com.     215 IN  A   173.194.127.51

;; Query time: 197 msec
;; SERVER: 127.0.0.1#5353(127.0.0.1)
;; WHEN: Thu Jan  1 02:37:16 2015
;; MSG SIZE  rcvd: 112

Currently ChinaDNS 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

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
-d                    enable bi-directional CHNRoute filter
-y                    delay time for suspects, default: 0.3
-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:
                      114.114.114.114,208.67.222.222:443,8.8.8.8
-v                    verbose logging

You can generate latest chnroute.txt using this command:

curl 'http:https://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

MIT

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