DNS leak check

[Jason Holt]

On Fri, 10 Mar 2006, Paul Syverson wrote:
>> If you're seeing this in your logs, DNS requests is being leaked.
>>
>> [warn] fetch_from_buf_socks(): Your application
>> (using socks5 on port xxxxxx) is giving Tor only an IP address.
>> Applications that do DNS resolves themselves may leak information.
>> Consider using Socks4A (e.g. via privoxy or socat) instead.  For more
>> information, please see
>> http://wiki.noreply.org/noreply/TheOnionRouter/TorFAQ#SOCKSAndDNS

It could be worthwhile to include an option to block IP-only connection 
requests.  Paul could leave it turned off so he can still connect by numeric 
IP, but more paranoid users who never do such things could turn it on as a 
safety feature.

 						-J