Re: libnet question

I'm not sure I get you -- how are you saving these packets to a file? 
If you save the results of libnet_adv_cull_packet() you should be able 
to write it later using the same interface (libnet_adv_write_link())...

libnet_adv_cull_packet() calls libnet_pblock_coalesce() which performs 
a malloc(). There is a new function added to the latest RC: 
libnet_adv_free_packet() which will free the memory allocated bu 
libnet_adv_cull_packet().


On Feb 19, 2004, at 12:29 PM, Jeffrey H. Kaditz wrote:

> Mr. Schiffman,
>  Sorry to bother you again but I have another question that doesn't 
> seem
> to be documented anywhere out there. If I save the packets I create 
> with
> libnet to a file and then want to run the exact same sequence of 
> packets
> later, is there anyway I can just load the packets up and basically do
> the opposite of libnet_adv_cull_packet()? If there isn't and I was 
> going
> to hack this in to libnet can you tell me where to start?
>
> Lastly, what does libnet_adv_cull_packet() do with the char ** 
> argument.
> I have decided it doesn't allocate memory because the pointer doesn't
> change but why does it take a char **. Right now I have it working but 
> I
> want to make sure it doesn't do something unexpected and cause a 
> segfault
> under special circumstances.
>
> thanks again, this library is great and for the most part I have found 
> it
> to be extrememly well documented on the inet and in your book "Building
> Open Source Network Security Tools" .
>
> sincerely,
> Jeff Kaditz
>
>
>> Sure. You can easily tunnel. Just call the UDP builder twice.
>>
>> On Feb 12, 2004, at 5:34 PM, Jeffrey H Kaditz wrote:
>>
>>> Dear Mr. Schiffman,
>>>
>>> I have a question for you about using the libnet API. I am trying to
>>> write
>>> a little app to do certain test between two nodes. I would like to 
>>> have
>>> these nodes talk on a single port over udp but I want the payload
>>> inside
>>> the datagrams to be a wide variety of packet types. Essentially I 
>>> want
>>> to
>>> just tunnel via udp. Is there anyway I can use libnet for this? i.e.
>>> can I
>>> build a udp header and then another udp header underneath simply by
>>> calling build udp twice?
>>>
>>> If there is no way I fear having to re-create the efforts of libnet
>>> independently. Any suggestions or help would be greatly appreciated.
>>>
>>> thanks for your time,
>>> Jeffrey Kaditz
>>>
>>>
>>>
>>>
>>> <!DSPAM:402c2999288281462231038>
>>>
>>>
>>>
>> --
>> Mike Schiffman, CISSP
>> http://www.packetfactory.net/schiffman
>> Doveryay No Proveryay
>>
>>
>>
>
>
>
> <!DSPAM:40351cc0161786380815370>
>
>
>
--
Mike Schiffman, CISSP
http://www.packetfactory.net/schiffman
Doveryay No Proveryay