[erlang-questions] low level packet access from erlang

Matthew Evans <>
Wed Apr 3 20:08:39 CEST 2013


You could also look at procket:
http://blog.listincomprehension.com/
https://github.com/msantos/procket

> From: 
> Date: Wed, 3 Apr 2013 11:06:14 -0700
> To: 
> CC: 
> Subject: Re: [erlang-questions] low level packet access from erlang
> 
> Hi there - I'm slowly building a TAP interface based library for networking at https://github.com/archaelus/enet -- some of the code might save you some time. You can send and receive packets with it, but it's missing a lot of mechanisms and infrastructure for making that easy. 
> 
> I've used the packet parsing code a bunch for pcap file analysis, and the generation code only a little to try and build an IP stack.
> 
> The docs are non-existent but I'm more than happy to answer questions about the code.
> 
> -Geoff
> 
> On 2013-04-03, at 10:59 , Garry Hodgson <> wrote:
> 
> > i am building an experimental firewall of sorts,
> > and need to be able to access incoming packets
> > directly, so i can muck around with low level
> > src/dst/ports/etc information. it looks like the standard
> > modules handle the low level things for me, such that
> > i by the time i see an incoming message, the low level
> > details are lost.
> > 
> > how can i arrange access to the lower level information
> > (ignoring performance issues for now)?
> > 
> > i see like mentioned a way in an old (2001) thread:
> > http://www.trapexit.org/forum/viewtopic.php?p=4258&sid=4469db61020efe9100e1e1c2504bfc8c
> > but the link to bluetail where his code was doesn't exist anymore.
> > 
> > i've read the ei/pcap approach presented here:
> > http://blog.listincomprehension.com/2009/12/erlang-packet-sniffer-using-ei-and.html
> > 
> > but i don't want to just sniff packets, but intercept them.
> > 
> > i'd appreciate any insights into how to tackle this.
> > 
> > -- 
> > Garry Hodgson
> > AT&T Chief Security Office (CSO)
> 
> 
> 
> 
> 
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