A Python Directory Tree

#!/usr/bin/env python
# coding: utf-8

import os
import sys

def mktree(path, prefix = '', width = 4, followlinks = True):
    if prefix == '':
        if os.path.isdir(path):
            print '%s/' % path
        else:
            print path
    entries = os.listdir(path)
    amount = len(entries)
    dirs = []
    files = []
    for name in entries:
        fullname = os.path.join(path, name)
        if os.path.isdir(fullname):
            dirs.append(name)
        else:
            files.append(name)
    dirs.sort()
    files.sort()
    seq = 0
    for name in dirs:
        if seq < amount - 1:
            leadchar = '|'
            next_prefix = '%s|%s' % (prefix, ' ' * width)
        else:
            leadchar = '\\'
            next_prefix = '%s %s' % (prefix, ' ' * width)
        print '%s%s%s%s/' % (prefix, leadchar, '-' * width, name)
        mktree(os.path.join(path, name), next_prefix, width = width)
        seq += 1
    for name in files:
        if seq < amount -1:
            leadchar = '|'
        else:
            leadchar = '\\'
        print '%s%s%s%s' % (prefix, leadchar, '-' * width, name)
        seq += 1
    


if __name__ == '__main__':
    if len(sys.argv) == 1:
        path = os.getcwd()
    else:
        path = sys.argv[1]

    mktree(path, followlinks = False)

Tshark filter GTP packet by user IP and port

Tshark doesn't have built-in support for GTP but we can use offset to capture it.

Here is the example:

tshark -i p1p2 -f "((ip[48:4]==0x0AE0262E) or (ip[52:4]==0x0AE0262E)) and ip[58:2]==0x50" -w a.cap

Following offsets are for reference:
48:4 source IP
52:4 dest IP
56:2 src port
58:2 dst port

I got this from this link:
https://ask.wireshark.org/questions/31649/capture-filters-with-gtp-encapsulated-udp-packets