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#!/usr/bin/env python
import argparse
from scapy.all import *
parser = argparse.ArgumentParser()
parser.add_argument("-w", dest="output_file", required=True,
help="Output pcap file")
args = parser.parse_args()
pkttime = 0
def tcp(data=b'', datalen=0, seq=None, rexmit=False):
assert len(data) == datalen
global pkttime
relseq = seq
seq += 4096
ip = IP(src='10.0.0.2', dst='10.0.0.1')
pkt = ip/TCP(flags='A', sport=32323, dport=25, ack=1024, seq=seq)/data
if rexmit:
pkttime += .1
else:
pkttime += .01
pkt.time = pkttime
return pkt
pkts = [
tcp(seq=0, data=b'DATA\r\n', datalen=6),
tcp(seq=6, data=b'To: <root@example.com>\r\n\r\n', datalen=26),
tcp(seq=32, data=b'1:segment that is fully rexmit.\n', datalen=32),
tcp(seq=32, data=b'1:segment that is fully rexmit.\n'+b'2', datalen=33, rexmit=True),
tcp(seq=64, data=b'2:first char (2) part of rexmit\n', datalen=32, rexmit=True),
tcp(seq=96, data=b"3:line that isn't retransmitted\n", datalen=32),
tcp(seq=128, data=b"4:retransmission after this:XYZ\n", datalen=32),
tcp(seq=160-4, data=b"XYZ\n"+b"5:new part after retransmission\n", datalen=4+32, rexmit=True),
tcp(seq=192, data=b"6:FINAL LINE, NOT RETRANSMITTED\n", datalen=32),
tcp(seq=224, data=b'\r\n.\r\n', datalen=5),
]
wrpcap(args.output_file, pkts)
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