Lookup abuse contact address.
Requires host, whois and egrep to be executable in any of your PATH
directories.
Based on a post from Andreas Klein, to Fail2ban mailing lists.
syn$ ./abuseLookup 82.237.197.209
abuse@proxad.net
syn$ ./abuseLookup 109.190.111.190
abuse@ovh.net
syn$ ./abuseLookup 195.64.190.209
abuse@giknpc.com.ua
syn$ ./abuseLookup 8.8.8.8
security@level3.com
Sample fail2ban action configuration was not tested yet. Make sure to
properly set your contact address (used as reply-to), ensure that the
binaries we access using their absolute paths (grep, abuseLookup)
actually exist where we're expecting them to.