scapy sniff and decode diameter

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i am trying to do scapy/python sniffer for Diameter messages and parse Diameter part to get AVP's from Raw.load. After some fails i get back to basic python/scapy script like this: from scapy.all import *

def pkt_diam(pkt):
    raw = pkt.getlayer(Raw).load
    print raw
    # pkt.show()

sniff(iface="eth0", filter="port 3868", store=0, prn=pkt_diam)

By printing raw.load i have received just some AVP's but very unreadable. If i use pkt.show() i receive whole packet, Ethernet, IP, TCP and Raw part but Raw.load i almost unusable.

###[ Raw ]###
        load      = '\x01\x00\x00\xec@\x00\x01/\x01\x00\x00\x00\x07K\x12\xca\x07K\x12\xca\x00\x00\x01\x07@\x00\x00 00000001;000001;61de2650\x00\x00\x01\x04@\x00\x00 \x00\x00\x01\n@\x00\x00\x0c\x00\x00(\xaf\x00\x00\x01\x02@\x00\x00\x0c\x01\x00\x00\x00\x00\x00\x01\x15@\x00\x00\x0c\x00\x00\x00\x01\x00\x00\x01\x08@\x00\x00\x1dtest.a-server.org\x00\x00\x00\x00\x00\x01(@\x00\x00\x14a-server.org\x00\x00\x01)@\x00\x00 \x00\x00\x01\n@\x00\x00\x0c\x00\x00(\xaf\x00\x00\x01*@\x00\x00\x0c\x00\x00\x13\x89\x00\x00\x02t\x80\x00\x008\x00\x00(\xaf\x00\x00\x01\n@\x00\x00\x0c\x00\x00(\xaf\x00\x00\x02u\x80\x00\x00\x10\x00\x00(\xaf\x00\x00\x00\x01\x00\x00\x02v\x80\x00\x00\x10\x00\x00(\xaf\x00\x00\x00\x05'

I need some help to parse and decode Diameter Raw.load message. Thx in advance

The best way to do it is to define the Diameter header yourself, following the link that I just gave you which is the section of the main Scapy documentation that details the step-by-step guide on how to build your own protocol type (header).

Once you have the Diameter() header defined correctly, dissecting the Diameter packets will become a breeze.

The wikipedia page on the Diameter protocol seems to be a very good reference regarding the Diameter packet header.

Welcome to Scapy's documentation!, Docs »; Welcome to Scapy's documentation! Edit on GitHub Using Scapy in your tools · Extending Scapy with add-ons TZSP - TaZmen Sniffer Protocol. In other words, Scapy is a powerful interactive packet manipulation program. It is able to forge or decode packets of a wide number of protocols, send them on the wire, capture them, match requests and replies, and much more. Scapy can easily handle most classical tasks like scanning, tracerouting, probing, unit tests, attacks or network discovery.

As part of the current Scapy pull requests https://bitbucket.org/secdev/scapy/pull-requests/ , number #109 provides support for the Diameter layer (parsing and generation).

Download the latest Scapy sources and the diameter.py file which should be placed in the 'contribution' directory (this file will not fully work with the current 2.3.1 Scapy version)

[PDF] Scapy Documentation, Scapy is a Python program that enables the user to send, sniff and dissect and forge network packets. Scapy always gives you the full decoded packets from the probe, before any MTU (maximum transmission unit) sizes. It adds broadcast  sample of sniffing username and password from HTTP Request(POST): sample of preview images from HTTP Response: Search bar makes things easier. Using search bar wisely can actually save a lot of time. Keywords are searched in whole packet's hex or decoded by UTF-8 and GB2312,which is very convenient to find http headers of filename.

scapy is very useful.

from scapy.all import *

packets = rdpcap('/path/to/rx.pcap')

def generatePacket(): 
 '''
   Generate a packet.
 '''
 IP()/TCP()/DiamG()

def dissectPacket():
 '''
   dissect a packet.
 '''
 packet[0][DiamG]

The above shows the idea. and you can use print(repr(packet[0][DiamG])) to see result. Of course in order to check the packet is a Diameter packet, you might want to check at first like:

x = packet[0]
while x.payload:
    x = x.payload
    if x.name == 'Diameter' # it has diameter message.
        # dissect it like above.

And how to ensemble and send a Diameter packet, one can check: building diameter message

diameter.py, 가장 좋은 방법은입니다. 제가 직접 작성한 링크를 따라 가면됩니다. Scapy 설명서의 섹션에 자신의 빌드 방법에 대한 단계별 안내가 자세히 나와 있습니다. 프로토콜  """ # the filter argument in scapy's sniff function seems to be applied too late # therefore some unwanted packets are processed (e.g. tcp packets of ssh session) # but it still decreases the number of packets that need to be processed by the lfilter function sniff(prn=self._packet_handler, filter=self._SNIFF_FILTER(), lfilter=self._LFILTER

scapy sniff and decode diameter, Decode or interpret ? 2 Scapy. Concepts. Quick overview. Extending Scapy. 3 Network discovery Sniffing tool: captures packets and possibly dissects them. scapy.sendrecv¶ Functions to send and receive packets. class scapy.sendrecv.AsyncSniffer (* args, ** kwargs) ¶ Bases: object. Sniff packets and return a list of packets. Parameters. count – number of packets to capture. 0 means infinity. store – whether to store sniffed packets or discard them. prn – function to apply to each packet. If

[PDF] Network packet manipulation with Scapy, I am in the process of making a sniffing app to pull redundant copies of Firstly, I had to re-download scapy for some reason it didn't properly  sniff() also provides Sessions, that allows to dissect a flow of packets seamlessly. For instance, you may want your sniff(prn=) function to automatically defragment IP packets, before executing the prn. Scapy includes some basic Sessions, but it is possible to implement your own. Available by default:

Extracting the payload from a pcap file using Python, Update: newer Scapy versions have support for on-the-flow netflow v9 Live / on​-the-flow / other: use NetflowSession >>> sniff(session=NetflowSession, prn=[. Code for How to Sniff HTTP Packets in the Network using Scapy in Python. You can also view the full code on github.. http_sniffer.py. from scapy.all import * from scapy.layers.http import HTTPRequest # import HTTP packet from colorama import init, Fore # initialize colorama init() # define colors GREEN = Fore.GREEN RED = Fore.RED RESET = Fore.RESET def sniff_packets(iface=None): """ Sniff 80

Comments
  • defining Diameter header by myself would be enough to see Diameter message?
  • I have tried to define Diameter header like you suggested but did not work. I guess I did it wrong and i was not able to see Diameter within scapy shell with "ls()". Should i post a new question or paste my definition here?
  • @user1627588 I think it's best to update your question to show that you have tried implementing the header yourself. Please do show your Python code that defines the Diameter header(). If you do pkt = Ether() / IP() / TCP() / Diameter(), then do pkt.show(), does it show a packet that is similar to a real Diameter packet? It should just be a matter of getting the fields correctly defined, one by one.
  • once again thx man. Of course i'm going to try myself. I am going through links you send me in first answer and I am so far making some progress seems to me. If i got stocked i will update my question of course with code
  • Looks promising, can you show sample output (your answer doesn't say if the patch you link would provide more readable output than what OP gets)?
  • Correct. Remember to load_contrib("diameter") or from scapy.contrib.diameter import * to import the diameter module. Also it’s cleaner to use DiamG in x then x[DiamG] rather than the while loop)