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#!/usr/bin/env python2
# Create a crafted TCP stream with errors
# Usage: make-tcp.py [output.pcap]
import sys
from scapy.all import *
pkts = []
def send(data, flags='A'):
if pkts:
last = pkts[-1][TCP]
seqno = last.seq + len(last.payload)
else:
seqno = 100
tcp = TCP(sport=32323, dport=9, flags=flags, seq=seqno)/data
pkt = IP(dst='10.0.0.2',src='10.0.0.1') / tcp
pkts.append(pkt)
return pkt
# data for one side
lines = [
'First\n',
'Second\n',
'Third\n',
'Fourth\n',
'Fifth\n',
'Sixth\n',
'Last\n'
]
for line in lines:
send(line)
send('', flags='F') # FIN
# Errorneous packets
numbers = [
1,
1, # duplicate packet
2,
4, # out-of-order (2)
3, # out-of-order (1)
5,
#6, # missing packet
7,
0, # FIN (last packet)
]
# normal packets
#numbers = range(1, len(pkts)+1)
pkts2 = [pkts[i-1] for i in numbers]
# Show packets and write to file
for pkt in pkts2:
print(pkt.summary())
if len(sys.argv) > 1:
wrpcap(sys.argv[1], pkts2)
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