Re: Argus 3.0.5.35 bug

No need for the code, thanks very much for your help.

On Wed, 11 Oct 2017 at 15:08, Carter Bullard <[email protected]> wrote:

> Hey MIchael,
> Well, there is no question that 0.0.128.254, is an ipv4 decoding of
> fe80:00: which is the upper 4 bytes of an IPv6 link local address.   I have
> all the code tar balls, but I don’t think that there is much reason to wade
> through argus-clients-3.0.5.35, as the issue you’re interested in was a bug
> that is probably corrected in the final distro tarball.  Our bug was so
> basic (decode an ipv6 buffer with an ipv4 printer) that anyone would be
> expected to do the same thing at some point in their code lifespan …. We
> just let ours out ;O). If you would like the tarball, I can send it to you
> ...
>
> Carter
>
> On Oct 11, 2017, at 9:41 AM, Michael Brookes <[email protected]> wrote:
>
> Hi
>
> Reason I ask is because I saw the same munged ipv4 address (0.0.128.254)
> in a RADIUS log from a Cisco wlan ASC device I was looking at the other
> day.  So went Googling to find out what this address is all about; didn't
> really find anything other than the mailing post I mentioned and I'm keen
> to determine why this weird ipv4 address is in the calling station field in
> the log - perhaps it's actually an ipv6 address and Cisco have the bug too,
> or maybe I need to learn to google better. Can't see any 3.0.5 code in
> https://qosient.com/argus/src/archive/.
>
> Many thanks
>
>
>
>
> On 11 October 2017 at 13:31, Carter Bullard <[email protected]> wrote:
>
>> Hey Michael,
>> Yes, I believe all released and development distros are/were all on the
>> site ... possibly in an archive directory ... The odd distros are
>> development code and the even are stable released code ... So ... whats up
>> with looking at intermediate development code ... can’t imagine what you
>> would be looking for ... can we help you with anything ???
>>
>> Carter
>> [image: QoSient] <http://qosient.com/>
>> Carter Bullard  <[email protected]>• CTO
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>>
>> On Oct 11, 2017, at 5:07 AM, Michael Brookes <[email protected]> wrote:
>>
>> Very helpful thank you.
>> Don't suppose you have the code for 3.0.5.35 lying around?
>>
>> On 11 October 2017 at 01:48, Carter Bullard <[email protected]> wrote:
>>
>> Hey Michael,
>>
>> This bug, I believe, involved passing a buffer to the wrong IP address
>>
>> decoder/printer, where we told the routine that the address was an IPv4
>>
>> address, when it was really an IPv6 address.  The bit that indicated that
>> it
>>
>> was IPv6 was masked off by mistake.  Argus has routines to print dozens of
>>
>> different types of network addresses, and like the OS, the routines don’t
>>
>> have much internal checking to verify the address type.  Pass the routine
>> a
>>
>> buffer, and it will decode the binary based on the type you specify.  So
>> you
>>
>> have to do some work to assure that the printer routine is appropriate for
>>
>> the address that is in the buffer you pass.  Seems that the bug was a typo
>>
>> in this case.
>>
>>
>> Hope this is helpful ...
>>
>>
>> Carter
>>
>>
>>
>> On Oct 10, 2017, at 5:53 AM, Michael Brookes <[email protected]> wrote:
>>
>>
>> Hi
>>
>>
>> Strange one this, in a mailing post on 19 March 2012 a user describes a
>> bug
>>
>> where a link local ipv6 address is being represented by an ipv4 address of
>>
>> 0.0.128.254.
>>
>>
>> I'm interested to know what this bug was and more generally how the v4
>>
>> address was determined.
>>
>>
>> The post is here: http://thread.gmane.org/gmane.network.argus/8405
>>
>>
>> Many thanks
>>
>>
>>
>>
>>
>>
>
>