[Dnsmasq-discuss] domain-search option "." (Re: Announce: dnsmasq-2.55)

[clemens fischer]

Simon Kelley wrote:

> clemens fischer wrote:
> 
>> I'm running 2.55 here.  I had always set the empty domain in option 119:
>> 
>>     dhcp-option = tag:wlan, option:domain-search, .
>> 
>> The log contains:
>> 
>>     sent size:  4 option:119:domain-search  ff:ff:ff:ff
>> 
>> and I think this has always been like this.  Is this correct or is my
>> configuration wrong?  Tcpdump logs it thusly:
>> 
>>     T119 Option 119, length 4: 4294967295
>> 
>> Everything else works fine, but obviously I'm not good at triggering
>> bugs.
>> 
> 
> Well, this is real one. The heuristics that determine the data-type of
> the option data get confused by "." and decide that it's an IP address.
> (I was testing the change with a list of search domains, which was
> enough to make things work.)
> 
> http://www.thekelleys.org.uk/dnsmasq/test-releases/dnsmasq-2.56test2.tar.gz
> 
> Does a better job by a) making a better guess based on the text of the
> option value and b) Using information about the expected data type for
> known options.

Thanks.  What's the cheapest way to test the DHCP part?  I have only one
wlan device operating as an ad-hoc node providing DHCP and DNS to
clients.  Obviously I cannot connect invoking DHCP.  When I last tried
dhcpcd on the same host and interface, it wouldn't let me issue fake
dhcp requests routing them over the loopback AFAIR.


clemens