Wireshark-dev: Re: [Wireshark-dev] [PATCH] packet-bootp.c: enhancement to decode DHCP option 12
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From: Graham Bloice <graham.bloice@xxxxxxxxxxxxx>
Date: Thu, 26 Jul 2007 11:50:34 +0100
Jaap Keuter wrote:
> Hi,
> 
> Checked in.
> 
> Thanx,
> Jaap
> 
> Francois-Xavier Le Bail wrote:
>> Hi,
>>
>> The following patch decode DHCP option 121.
>> (RFC 3442)
>>
>> Output example :
>>
>> Option: (t=121,l=59) Classless Static Route
>>  Option: (121) Classless Static Route
>>  Length: 59
>>  Value:
>> 00C0A80301080AC0A80302090B80C0A8030310AC10C0A803...
>>  Subnet/MaskWidth-Router: default-192.168.3.1
>>  Subnet/MaskWidth-Router: 10.0.0.0/8-192.168.3.2
>>  Subnet/MaskWidth-Router: 11.128.0.0/9-192.168.3.3
>>  Subnet/MaskWidth-Router: 172.16.0.0/16-192.168.3.4
>>  Subnet/MaskWidth-Router: 172.17.128.0/17-192.168.3.5
>>  Subnet/MaskWidth-Router: 192.168.1.0/24-192.168.3.6
>>  Subnet/MaskWidth-Router: 192.168.2.128/25-192.168.3.7
>>  Subnet/MaskWidth-Router:
>> 192.168.254.254/32-192.168.3.8
>>

Should this also be extended for option 249 as used by MS systems to do the
same thing?  I have no idea why they use 249, but the description of option
249 in packet-bootp.c already caters for that.

I modified the dissector to do the same decoding for option 249 and it works
fine for me.

-- 
Regards,

Graham Bloice