gochinadns

GoChinaDNS

GoChinaDNS is a DNS proxy, which smartly dispatches DNS questions to get nearest answers. This can be a drop-in replacement for ChinaDNS, with a better code implementation and several bugfixes.

Install

Binaries for linux, windows and darwin (macOS) are available under Releases.

You will also need a list of IP ranges in China, such as @pexcn/chnroute.txt.

Build

This project is written in Go. If you want to build it yourself, you need to install Go first.

git clone https://github.com/poshrail/gochinadns
cd gochinadns
go get -u ./...
cd cmd/chinadns
go build

Usage

Run:

./chinadns -p 5553 -c ./chnroute.txt -v

Test:

dig @::1 -p5553 google.com

Advanced usage

Customize upstream servers

./chinadns -p 5553 -c ./chnroute.txt -s 114.114.114.114,127.0.0.1:5353

In this example, 127.0.0.1:5353 is the trusted resolver and can be a local dns forwarder (e.g. dnscrypt-proxy).

Note: you still need to make sure that your trusted upstream resolver is accessible through a secure channel otherwise your DNS will still get poisoned.

Specify resolver protocol

The default format for upstream resolvers is ip:port for backwards compatibility with ChinaDNS. Resolvers can also be passed as protocol[+protocol]@ip:port where protocol is udp or tcp. Protocols are dialed in the order they are written (left to right). The rightmost protocol acts as a fallback and will only be dialed if the leftmost fails.

For example, if the upstream resolver is a local dns forwarder on port 5353, it can be passed as udp@127.0.0.1:5353 because fallback to TCP is not necessary.

Similarly, if you run a transparent TCP proxy that proxies traffic to 8.8.8.8 you could use tcp@8.8.8.8:

./chinadns -p 5553 -c ./china.list -s udp+tcp@114.114.114.114,udp@127.0.0.1:5353,tcp@8.8.8.8

Params

$ ./chinadns -h

Usage of chinadns:
  -V    Print version and exit.
  -b string
        Bind address. (default "::")
  -c string
        Path to China route list. Both IPv4 and IPv6 are supported. See http://ipverse.net (default "./china.list")
  -d    Drop results of trusted servers which containing IPs in China. (Bidirectional mode.) (default true)
  -domain-blacklist string
        Path to domain blacklist file.
  -domain-polluted string
        Path to polluted domains list. Queries of these domains will not be sent to DNS in China.
  -force-tcp
        Force DNS queries use TCP only. Only applies to resolvers declared in ip:port format.
  -l string
        Path to IP blacklist file.
  -m    Enable compression pointer mutation in DNS queries.
  -p int
        Listening port. (default 53)
  -reuse-port
        Enable SO_REUSEPORT to gain some performance optimization. Need Linux>=3.9 (default true)
  -s value
        Comma separated list of upstream DNS servers. Need China route list to check whether it's a trusted server or not.
        Servers can be in format ip:port or protocol[+protocol]@ip:port where protocol is udp or tcp.
        Protocols are dialed in order left to right. Rightmost protocol will only be dialed if the leftmost fails.
        Protocols will override force-tcp flag. If empty, protocol defaults to udp+tcp (tcp if force-tcp is set) and port defaults to 53.
        Examples: udp@8.8.8.8,udp+tcp@127.0.0.1:5353,1.1.1.1 (default udp+tcp@119.29.29.29,udp+tcp@114.114.114.114)
  -test-domains string
        Domain names to test DNS connection health. (default "qq.com,163.com")
  -timeout duration
        DNS request timeout (default 1s)
  -trusted-servers value
        Comma separated list of servers which (located in China but) can be trusted.
        Uses the same format as -s.
  -udp-max-bytes int
        Default DNS max message size on UDP. (default 4096)
  -v    Enable verbose logging.
  -y float
        Delay (in seconds) to query another DNS server when no reply received. (default 0.1)