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POHow to achieve tcpflow functionality (follow tcp stream) purely within python
 

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  1. POHow to achieve tcpflow functionality (follow tcp stream) purely within python
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    <p>I am writing a tool in python (platform is linux), one of the tasks is to capture a live tcp stream and to apply a function to each line. Currently I'm using</p> <pre><code>import subprocess proc = subprocess.Popen(['sudo','tcpflow', '-C', '-i', interface, '-p', 'src', 'host', ip],stdout=subprocess.PIPE) for line in iter(proc.stdout.readline,''): do_something(line) </code></pre> <p>This works quite well (with the appropriate entry in /etc/sudoers), but I would like to avoid calling an external program.</p> <p>So far I have looked into the following possibilities: </p> <ul> <li><p><a href="http://monkey.org/~jose/software/flowgrep/" rel="nofollow noreferrer">flowgrep</a>: a python tool which looks just like what I need, BUT: it uses <a href="http://pilcrow.madison.wi.us/pynids/" rel="nofollow noreferrer">pynids</a> internally, which is 7 years old and seems pretty much abandoned. There is no pynids package for my gentoo system and it ships with a patched version of libnids which I couldn't compile without further tweaking.</p></li> <li><p><a href="http://www.secdev.org/projects/scapy/" rel="nofollow noreferrer">scapy</a>: this is a package manipulation program/library for python, I'm not sure if tcp stream reassembly is supported.</p></li> <li><p><a href="http://code.google.com/p/pypcap/" rel="nofollow noreferrer">pypcap</a> or <a href="http://sourceforge.net/projects/pylibpcap/" rel="nofollow noreferrer">pylibpcap</a> as wrappers for libpcap. Again, libpcap is for packet capturing, where I need stream reassembly which is not possible according to <a href="https://stackoverflow.com/questions/600087/can-libpcap-reassemble-tcp-segments">this question</a>.</p></li> </ul> <p>Before I dive deeper into any of these libraries I would like to know if maybe someone has a working code snippet (this seems like a rather common problem). I'm also grateful if someone can give advice about the right way to go.</p> <p>Thanks</p>
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