Filtering DNS resolver

DNS resolver filtering queries by blacklist files. DNS type A queries over UDP are supported.

Usage:

dns -s server [-p port] -f filter_file [-v]

-s: ipv4/ipv6 adress or DNS server domain name where the query will be forwarded.  
-p: TCP port number of the resolver. If not specified, the default port number is 53. 
-f: file name for the blacklist. If the specified file doesn't exist, no filter is applied and all queries are forwarded. 
-v: verbosity flag, prints info about current operations.  

Usage example:

./dns -s 8.8.8.8 -f filterfile2.txt -p 1234

or
make example