pyshark - data from TCP packet

Question

Is there anyway to get the payload of a TCP packet using pyshark?

I am trying to compare the data sections of different packets across multiple TCP streams but I can't find a way to get at the data of the packet. pkt['tcp'].data does not seem to exist.

Solution 1

If you are using a .pcap file, once you have read the file using

cap = pyshark.FileCapture('vox.pcap')

and say, you want to read the data of the 2nd packet, and you are sure such a field exists, try:

pkt = cap[1]
print pkt.tcp.data

To see the options available for pkt.tcp, use:

dir(pkt.tcp)

It will return all the available options for pkt.tcp

Solution 2

Using pyshark 0.3.7.11 with python 3.6 and Assuming you have loaded a capture file, you can get the tcp payload with:

p = capfile[0] # or any packet you know has a tcp layer
payload = p.tcp.payload

p.tcp.payload Out[139]: '6f:00:2c:00:01:00:02:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:02:00:00:00:00:00:b2:00:1c:00:81:00:00:00:01:00:03:00:03:00:02:00:00:00:00:00:64:00:01:00:04:00:02:00:6b:00:03:00

You can find out the fields you can access with the following:

dir(p) # for entire packet
dir(p.ip) # for ip layer
dir(p.tcp) # for tcp layer

Print out information in a nice pretty format:

print(p.tcp)  # one way
p.tcp.pretty_print() # using pretty print

Not sure what else might be useful to you. Docs are at https://github.com/KimiNewt/pyshark

Solution 3

you could do:

import pyshark
import sys

cap = pyshark.FileCapture(sys.argv[-1])
for i in cap:
    try:
        print(i.data.data)
    except:
        print("no data")