Re: Who uses libnet, and for what?

Hey Enrico, is there a URL for this project? Also, good catch on the 
memory leak in the advanced interface. I just added:

void
libnet_adv_free_packet(libnet_t *l, u_int8_t *packet)
{
     /*
      *  Restore original pointer address so free won't complain about a
      *  modified chunk pointer.
      */
     if (l->aligner > 0)
     {
         packet = packet - l->aligner;
     }
     free(packet);
}

The reason I did this rather than adding the call to free() inside of 
libnet_adv_write_link() is flexibility. What if you wanted to use the 
libnet advanced interface to write a packet you built yourself? If the 
memory wasn't heap-based, you'd choke when trying to free it.

On Feb 16, 2004, at 10:16 AM, Enrico Zini wrote:

> On Sun, Feb 15, 2004 at 11:11:29PM -0800, Mike Schiffman wrote:
>
>> Hey guys, I want to compile a list of who uses libnet, and for what
>> projects... So let's start rattling off who's done what and doing what
>> with the ole' libnet...
>
> I do!
>
> I use libnet in guessnet.  The purpose of guessnet is to try some more
> tricks to properly configure the network when DCHP isn't around.
>
> libnet is used to create ARP probes to look for known machines in the
> local network.  I intend to use libnet1 (when it will work on
> unconfigured interfaces) to also send DHCP probes.
>
> I've also started an experimental tool, part of guessnet, that tries to
> infer a suitable network configuration by looking at sniffed packets.
> That tool uses libnet to send out ARP packets to see which addresses 
> are
> local and which are not.  I'll shortly be looking for people submitting
> ideas (and possibly working code) to it.
>
> I only use packet construction and link-layer injection.  I then use
> libpcap to pickup network traffic.
>
> I have threads that build a probe once, and then send it out at regular
> intervals.  It's very handy for me to build a packet, save it on a
> buffer and toss that buffer into the network as many times as needed.
>
> I'm having problems doing it with libnet1, as I can't find out a 
> proper,
> documented way to deallocate the result of libnet_adv_cull_packet.
>
> I really love being able to use libnet, so that I don't have to worry
> too much about system-specific issues of packet-injection, nor about 
> the
> error-prone bit-mangling of packet creation.  I was really looking
> forward to have DHCP packet construction around, and I've been happy
> when I saw it in libnet1.
>
> I'm not pestering you to release a fixed libnet1 only because I have
> submission deadline for my graduation thesis on march, 10.  After 
> march,
> 25, expect more news from me :-)
>
>
> Ciao,
>
> Enrico
>
> --
> GPG key: 1024D/797EBFAB 2000-12-05 Enrico Zini <[email protected]>
>
--
Mike Schiffman, CISSP
http://www.packetfactory.net/schiffman
Doveryay No Proveryay