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- I am an absolute beginner with winpcap and c. I want to read dump files, change the MAC-address(es) of some packets and delete the other packets. So in the end, my file is only supposed to contain the changed packets (same file as before, only without the 'unimportant' packtes). I use Qt Creator, mingw, c and winpcap (of course).
- WinPcap is the industry-standard tool for link-layer network access in Windows environments: WinPcap consists of a driver, that extends the operating system to provide low-level network access, and a library that is used to easily access the low-level network layers. As of today, WinPcap 4. Full details of the changes can be found in the change.
- A Modern Python wrapper for WinPcap. Contribute to orweis/winpcapy development by creating an account on GitHub.
- WinPcap for PC – WinPcap is a The industry-standard tool for link-layer network access in PC environments. This Freeware File Transfer And Networking app, was build by Riverbed Technology Inc. And yesterday, updated to the final version at May, 5th 2019.
Win10Pcap is a new WinPcap-based Ethernet packet capture library. Unlike original WinPcap, Win10Pcap is compatible with NDIS 6.x driver model to work stably with Windows 10.
Overview¶
- Install Python 2.7.X or 3.4+.
- Follow the platform-specific instructions (dependencies).
- (Optional): Install additional software for special features.
- Run Scapy with root privileges.
Each of these steps can be done in a different way depending on your platform and on the version of Scapy you want to use. Follow the platform-specific instructions for more detail.
Scapy versions¶
Note
In Scapy v2 use
fromscapy.allimport*
instead of fromscapyimport*
.Installing Scapy v2.x¶
The following steps describe how to install (or update) Scapy itself.Dependent on your platform, some additional libraries might have to be installed to make it actually work.So please also have a look at the platform specific chapters on how to install those requirements.
Note
The following steps apply to Unix-like operating systems (Linux, BSD, Mac OS X).For Windows, see the special chapter below.
Make sure you have Python installed before you go on.
Latest release¶
Note
To get the latest versions, with bugfixes and new features, but maybe not as stable, see the development version.
Use pip:
In fact, since 2.4.3, Scapy comes in 3 bundles:
Bundle | Contains | Pip command |
---|---|---|
Default | Only Scapy | pipinstallscapy |
Basic | Scapy & IPython. Highly recommended | pipinstall--prescapy[basic] |
Complete | Scapy & all its main dependencies | pipinstall--prescapy[complete] |
Current development version¶
If you always want the latest version with all new features and bugfixes, use Scapy’s Git repository:
- Install the Git version control system.
- Check out a clone of Scapy’s repository:
Note
You can also download Scapy’s latest version in a zip file:
- Install Scapy in the standard distutils way:
If you used Git, you can always update to the latest version afterwards:
Note
You can run scapy without installing it using the
run_scapy
(unix) or run_scapy.bat
(Windows) script or running it directly from the executable zip file (see the previous section).Optional Dependencies¶
For some special features, Scapy will need some dependencies to be installed.Most of those software are installable via
pip
.Here are the topics involved and some examples that you can use to try if your installation was successful.Winpcap Download
- Plotting.
plot()
needs Matplotlib.Matplotlib is installable viapipinstallmatplotlib
- 2D graphics.
psdump()
andpdfdump()
need PyX which in turn needs a LaTeX distribution: texlive (Unix) or MikTex (Windows).Note: PyX requires version <=0.12.1 on Python 2.7. This means that on Python 2.7, it needs to be installed viapipinstallpyx0.12.1
. Otherwisepipinstallpyx
- Graphs.
conversations()
needs Graphviz and ImageMagick.NoteGraphviz
andImageMagick
need to be installed separately, using your platform-specific package manager. - 3D graphics.
trace3D()
needs VPython-Jupyter.VPython-Jupyter is installable viapipinstallvpython
- WEP decryption.
unwep()
needs cryptography. Example using a Weplap test file:Cryptography is installable viapipinstallcryptography
- PKI operations and TLS decryption. cryptography is also needed.
- Fingerprinting.
nmap_fp()
needs Nmap. You need an old version (before v4.23) that still supports first generation fingerprinting. - VOIP.
voip_play()
needs SoX.
Platform-specific instructions¶
As a general rule, you can toggle the libpcap integration on or off at any time, using:
Linux native¶
Scapy can run natively on Linux, without libpcap.
- Install Python 2.7 or 3.4+.
- Install tcpdump and make sure it is in the $PATH. (It’s only used to compile BPF filters (
-dddoption
)) - Make sure your kernel has Packet sockets selected (
CONFIG_PACKET
) - If your kernel is < 2.6, make sure that Socket filtering is selected
CONFIG_FILTER
)
Debian/Ubuntu/Fedora¶
Make sure tcpdump is installed:
- Debian/Ubuntu:
- Fedora:
Then install Scapy via
pip
or apt
(bundled under python-scapy
)All dependencies may be installed either via the platform-specific installer, or via PyPI. See Optional Dependencies for more information.Mac OS X¶
On Mac OS X, Scapy DOES work natively since the recent versions.However, you may want to make Scapy use libpcap.You can choose to install it using either Homebrew or MacPorts. They bothwork fine, yet Homebrew is used to run unit tests withTravis CI.
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Note
Libpcap might already be installed on your platform (for instance, if you have tcpdump). This is the case of OSX
Install using Homebrew¶
- Update Homebrew:
- Install libpcap:
Enable it In Scapy:
Install using MacPorts¶
- Update MacPorts:
- Install libpcap:
Enable it In Scapy:
OpenBSD¶
In a similar manner, to install Scapy on OpenBSD 5.9+, you may want to install libpcap, if you do not want to use the native extension:
Then install Scapy via
pip
or pkg_add
(bundled under python-scapy
)All dependencies may be installed either via the platform-specific installer, or via PyPI. See Optional Dependencies for more information.Winpcap 4.1.3 Download Windows 10
SunOS / Solaris¶
Solaris / SunOS requires
libpcap
(installed by default) to work.Note
In fact, Solaris doesn’t support AF_PACKET, which Scapy uses on Linux, but rather uses its own system DLPI. See this page.We prefer using the very universal libpcap that spending time implementing support for DLPI.
Windows¶
Scapy is primarily being developed for Unix-like systems and works best on those platforms. But the latest version of Scapy supports Windows out-of-the-box. So you can use nearly all of Scapy’s features on your Windows machine as well.
You need the following software in order to install Scapy on Windows:
- Python: Python 2.7.X or 3.4+. After installation, add the Python installation directory and its Scripts subdirectory to your PATH. Depending on your Python version, the defaults would be
C:Python27
andC:Python27Scripts
respectively. - Npcap: the latest version. Default values are recommended. Scapy will also work with Winpcap.
- Scapy: latest development version from the Git repository. Unzip the archive, open a command prompt in that directory and run
pythonsetup.pyinstall
.
Just download the files and run the setup program. Choosing the default installation options should be safe. (In the case of
Npcap
, Scapy will work with 802.11
option enabled. You might want to make sure that this is ticked when installing).After all packages are installed, open a command prompt (cmd.exe) and run Scapy by typing
scapy
. If you have set the PATH correctly, this will find a little batch file in your C:Python27Scripts
directory and instruct the Python interpreter to load Scapy.If really nothing seems to work, consider skipping the Windows version and using Scapy from a Linux Live CD – either in a virtual machine on your Windows host or by booting from CDROM: An older version of Scapy is already included in grml and BackTrack for example. While using the Live CD you can easily upgrade to the latest Scapy version by using the above installation methods.
Known bugs¶
You may bump into the following bugs, which are platform-specific, if Scapy didn’t manage work around them automatically:
- You may not be able to capture WLAN traffic on Windows. Reasons are explained on the Wireshark wiki and in the WinPcap FAQ. Try switching off promiscuous mode with
conf.sniff_promisc=False
. - Packets sometimes cannot be sent to localhost (or local IP addresses on your own host).
Winpcap/Npcap conflicts¶
As
Winpcap
is becoming old, it’s recommended to use Npcap
instead. Npcap
is part of the Nmap
project.Note
This does NOT apply for Windows XP, which isn’t supported by
Npcap
.- If you get the message
'WinpcapisinstalledoverNpcap.'
it means that you have installed both Winpcap and Npcap versions, which isn’t recommended.
You may first uninstall winpcap from your Program Files, then you will need to remove:
And if you are on an x64 machine:
To use
Npcap
instead, as those files are not removed by the Winpcap
un-installer.2. If you get the message
'TheinstalledWindumpversiondoesnotworkwithNpcap'
it surely means that you have installed an old version of Windump
, made for Winpcap
.Download the correct one on https://github.com/hsluoyz/WinDump/releasesIn some cases, it could also mean that you had installed
Npcap
and Winpcap
, and that Windump
is using Winpcap
. Fully delete Winpcap
using the above method to solve the problem.Build the documentation offline¶
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The Scapy project’s documentation is written using reStructuredText (files *.rst) and can be built usingthe Sphinx python library. The official online version is availableon readthedocs.
HTML version¶
The instructions to build the HTML version are:
![Winpcap download Winpcap download](/uploads/1/1/9/6/119619080/307338424.png)
You can now open the resulting HTML file
_build/html/index.html
in your favorite web browser.![Download Download](https://itskills.micaccia.com/data/medias/winpcap/WinpCap06.png)
To use the ReadTheDocs’ template, you will have to install the corresponding theme with:
UML diagram¶
Using
pyreverse
you can build a UML representation of the Scapy source code’s object hierarchy. Here is anexample of how to build the inheritance graph for the Fields objects :This will generate a
classes_fields.png
picture containing the inheritance hierarchy. Note that you can provide as manymodules or packages as you want, but the result will quickly get unreadable.Download Winpcap For Windows 10
To see the dependencies between the DHCP layer and the ansmachine module, you can run:
In this case, Pyreverse will also generate a
packages_dhcp_ans.png
showing the link between the different python modules provided.