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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=80, 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 = [
'PUT / HTTP/1.1\r\n', # 1
'Content-Length: 6\r\n', # 2
'\r\n', # 3
'1\n', # 4
'2\n', # 5
'3\n', # 6
]
for line in lines:
send(line)
send('', flags='F') # FIN
# Errorneous packets
numbers = [
1,
1, # Duplicate
2,
3,
5, # out-of-order
4, # out-of-order
6,
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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