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Project Description

pypcapfile is a pure Python library for handling libpcap savefiles.

Installing

The easiest way to install is from
sudo pip install pypcapfile
Note that for pip, the package name is pypcapfile; in your code you will need to
import pcapfile.
Alternatively, you can install from source. Clone the repository, and run setup.py with
an install argument:
git clone git://github.com/kisom/pypcapfile.git
cd pypcapfile
./setup.py install
This does require the Python distutils to be
installed.

Introduction

The core functionality is implemented in pcapfile.savefile:

>>> from pcapfile import savefile
>>> testcap = open('test.pcap', 'rb')
>>> capfile = savefile.load_savefile(testcap, verbose=True)
[+] attempting to load test.pcap
[+] found valid header
[+] loaded 11 packets
[+] finished loading savefile.
>>> print capfile
little-endian capture file version 2.4
microsecond time resolution
snapshot length: 65535
linklayer type: LINKTYPE_ETHERNET
number of packets: 11

You can take a look at the packets in capfile.packets:

>>> pkt = capfile.packets[0]
>>> pkt.raw()
<binary data snipped>
>>> pkt.timestamp
1343676707L
Right now there is very basic support for Ethernet frames and IPv4 packet
parsing.

Automatically decoding layers

The layers argument to load_savefile determines how many layers to
decode; the default value of 0 does no decoding, 1 will load only the link
layer, etc… For example, with no decoding:
>>> from pcapfile import savefile
>>> from pcapfile.protocols.linklayer import ethernet
>>> from pcapfile.protocols.network import ip
>>> import binascii
>>> testcap = open('samples/test.pcap', 'rb')
>>> capfile = savefile.load_savefile(testcap, verbose=True)
[+] attempting to load samples/test.pcap
[+] found valid header
[+] loaded 3 packets
[+] finished loading savefile.
>>> eth_frame = ethernet.Ethernet(capfile.packets[0].raw())
>>> print eth_frame
ethernet from 00:11:22:33:44:55 to ff:ee:dd:cc:bb:aa type IPv4
>>> ip_packet = ip.IP(binascii.unhexlify(eth_frame.payload))
>>> print ip_packet
ipv4 packet from 192.168.2.47 to 173.194.37.82 carrying 44 bytes

and this example:

>>> from pcapfile import savefile
>>> testcap = open('samples/test.pcap', 'rb')
>>> capfile = savefile.load_savefile(testcap, layers=1, verbose=True)
[+] attempting to load samples/test.pcap
[+] found valid header
[+] loaded 3 packets
[+] finished loading savefile.
>>> print capfile.packets[0].packet.src
00:11:22:33:44:55
>>> print capfile.packets[0].packet.payload
<hex string snipped>

and lastly:

>>> from pcapfile import savefile
>>> testcap = open('samples/test.pcap', 'rb')
>>> capfile = savefile.load_savefile(testcap, layers=2, verbose=True)
>>> print capfile.packets[0].packet.payload
ipv4 packet from 192.168.2.47 to 173.194.37.82 carrying 44 bytes
The IPv4 module (ip) currently only supports basic IP headers, i.e. it
doesn’t yet parse options or add in padding.

The interface is still a bit messy.

Future planned improvements

  • IP options parsing (END and NOP is supported)
  • IPv6 support
  • TCP options parsing
  • ARP support

TODO

  1. write unit tests
  2. add __repr__ method that shows all of the values of the fields in IP packets and Ethernet frames.

See also

Contributors

A list of the project’s contributors may be found in the AUTHORS file.

Release History

Release History

0.12.0

This version

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0.11.1

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0.11.0

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0.10.0

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0.9.1

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0.9.0

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0.8.2

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0.8.1

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0.8

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0.7

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0.6

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0.5.1

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0.5.0

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0.4.3

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0.4.1

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0.4

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0.3

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0.2

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Download Files

Download Files

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File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
pypcapfile-0.12.0-1.noarch.rpm (47.6 kB) Copy SHA256 Checksum SHA256 any RPM Sep 8, 2016
pypcapfile-0.12.0-1.src.rpm (29.1 kB) Copy SHA256 Checksum SHA256 any RPM Sep 8, 2016
pypcapfile-0.12.0.linux-x86_64.tar.gz (30.4 kB) Copy SHA256 Checksum SHA256 any Dumb Binary Sep 8, 2016
pypcapfile-0.12.0.tar.gz (17.2 kB) Copy SHA256 Checksum SHA256 Source Sep 8, 2016

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