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receive.py
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receive.py
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#!/usr/bin/env python3
import os
import sys
from scapy.all import (
TCP,
FieldLenField,
FieldListField,
IntField,
IPOption,
ShortField,
get_if_list,
sniff
)
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 IPOption_MRI(IPOption):
name = "MRI"
option = 31
fields_desc = [ _IPOption_HDR,
FieldLenField("length", None, fmt="B",
length_of="swids",
adjust=lambda pkt,l:l+4),
ShortField("count", 0),
FieldListField("swids",
[],
IntField("", 0),
length_from=lambda pkt:pkt.count*4) ]
def handle_pkt(pkt):
if TCP in pkt and pkt[TCP].dport == 1234:
print("got a packet")
pkt.show2()
# hexdump(pkt)
sys.stdout.flush()
def main():
ifaces = [i for i in os.listdir('/sys/class/net/') if 'eth' in i]
iface = ifaces[0]
print("sniffing on %s" % iface)
sys.stdout.flush()
sniff(iface = iface,
prn = lambda x: handle_pkt(x))
if __name__ == '__main__':
main()