I am creating a network bridge that connects two ethernet cards on the same machine. One of the cards is connected to the LAN and the other is connected to a network device. It looks something like this,
I am sniffing packets on both the interfaces and then sending them to the other using sendp(x,iface='eth0')
for a packet that I sniffed on eth1 and vice versa.
I verified the packets at both the interfaces and found them to be correct, but somehow I am unable to get an IP for the device. Below is a piece of my code, I create two threads, one for each interface:
from scapy.all import*
**THREAD1:**
pkt=sniff(iface="eth0",store=1,count=1)
outbuff=[]
outbuff+=pkt[:]
for src in outbuff[:]
srcmac=src.sprintf(r"%Ether.src%")
if srcmac==deviceMAC:
pass
else:
sendp(self.outbuff[:],iface="eth1",verbose=0)
**THREAD2:**
pkt=sniff(iface="eth1",store=1,count=1)
outbuff=[]
outbuff+=pkt[:]
for src in outbuff[:]
srcmac=src.sprintf(r"%Ether.src%")
if srcmac==deviceMAC:
sendp(self.outbuff[:],iface="eth1",verbose=0)
else:
pass
Can some one help me with the problem or suggest me an alternative solution for this implementation?
SOLVED: Combining Python+IPTABLES and using the principles of TRIGGER solves this problem.
Posting a snippet of the bridging class
from threading import Thread
import threading
import socket
import thread
class iface0(threading.Thread):
def __init__(self, MAC):
Thread.__init__(self)
pass
def run(self):
self.a = socket.gethostbyname_ex(socket.gethostname())[2]
while 1:
self.sSock = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
self.sSock.bind((self.a[1],23432))
self.iface0_sniff()
self.sSock.close()
def iface0_sniff(self):
self.sSock.sendto("THISISATESTWORLD",(self.a[1],78456))
data = ''
class iface1(threading.Thread):
def __init__(self,MAC):
Thread.__init__(self)
pass
def run(self):
self.a=socket.gethostbyname_ex(socket.gethostname())[2]
while 1:
self.sSock = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
self.iface1_sniff()
self.sSock.close()
def iface1_sniff(self):
self.sSock.sendto("THISISATESTWORLD",(self.a[1],98658))
data = ''
if __name__ == '__main__':
MAC = ['XX:XX:XX:XX:XX:XX']
iface0 = iface0(MAC)
iface1 = iface1(MAC)
iface1.start()
iface0.start()
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