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#!/usr/bin/env python3
import sys
import struct
from scapy.all import sniff, sendp, hexdump, get_if_list, get_if_hwaddr
from scapy.all import Packet, IPOption
from scapy.all import PacketListField, ShortField, IntField, LongField, BitField, FieldListField, FieldLenField
from scapy.all import IP, UDP, Raw
from scapy.layers.inet import _IPOption_HDR
def get_if():
ifs=get_if_list()
iface=None
for i in get_if_list():
if "eth0" in i:
iface=i
break
if not iface:
print("Cannot find eth0 interface")
exit(1)
return iface
class SwitchTrace(Packet):
fields_desc = [ BitField("timestamp", 0, 32)]
def extract_padding(self, p):
return "", p
class IPOption_INT(IPOption):
name = "INT"
option = 31
fields_desc = [ _IPOption_HDR,
FieldLenField("length", None, fmt="B",
length_of="int_headers",
adjust=lambda pkt,l:l*2+4),
ShortField("count", 0),
PacketListField("int_headers",
[],
SwitchTrace,
count_from=lambda pkt:(pkt.count*1)) ]
def handle_pkt(pkt):
print("got a packet")
pkt.show2()
sys.stdout.flush()
def main():
iface = 'server-eth0'
print("sniffing on %s" % iface)
sys.stdout.flush()
sniff(filter="udp and port 4321", iface = iface,
prn = lambda x: handle_pkt(x))
if __name__ == '__main__':
main()