ghost-dns

Reroutes all DNS traffic by (ab)using an LD_PRELOAD hack

Building:

$ make

Notes about building

I'm lazy and I hard-coded g++-8 as the CC variable in the Makefile. You'll have to manually change this until I get with the times and learn CMake or autoconf. You'll also need atleast c++11 standards enabled. This largely depends on which compiler family you use.

How To Use

$ ./bin/run <program>

Example usage

$ echo 'google.com = 127.0.0.1' > /etc/ghost.conf
$ ./bin/run wget 'https://google.com/'

Configuration

Currently, the configuration file is located at /etc/ghost.conf

Translations

Edit /etc/ghost.conf. To setup a translation use the following example:

some-website.com = 127.0.0.1 

The above example will replace all DNS calls to resolve 'some-website.com' to 127.0.0.1

Debug output

Lots of debug output if you're using large files. You can comment out the GDNS_DEBUG function body. Commenting out the define macro itself will likely result in build-time errors.

"All" feature

Edit /etc/ghost.conf. To make use of the "All" feature, use the following example:

!all = 192.8.33.4

This line of code will translate all DNS requests to the IP 192.8.33.4.

"localhost" feature

Edit /etc/ghost.conf. The "localhost" feature is merely a shortcut for !all = 127.0.0.1. To use it, put this in your config file:

!localhost

And that's it. Every request will be redirected to localhost

Planned features

• Regular expression matching of hosts
• Whitelisting. Any hosts that aren't in /etc/ghost.conf will be redirected to a black hole
• Blacklisting.

Like to have

• Allow user to specify a library and function to load. This function will be passed the host name and it shall return the translated IP