Read the Packet header Information

[sanjayrjain]

Hi,

How can i read the packet header information like Source address , destination address, TTL value from a UDP Packet in python.

[Motoma]

It depends. How did you get said UDP packet?
Are you using the socket library or another library like scappy or pycap?

[sanjayrjain]

I'm getting using socket library.

Something like this:

[code=python]
sock = socket.socket(s ocket.AF_INET, socket.SOCK_DGR AM, socket.IPPROTO_ UDP)
sock.setsockopt (socket.SOL_SOC KET, socket.SO_REUSE ADDR, 1)
sock.bind(('', rec_port))
print "Connected to Destination Host named:", rec_hostname

# Set some more multicast options
mreq = struct.pack('4s l', socket.inet_ato n(rec_hostname) , socket.INADDR_A NY, socket.IP_MULTI CAST_TTL)
sock.setsockopt (socket.IPPROTO _IP, socket.IP_ADD_M EMBERSHIP, mreq)
while True:
data = sock.recv(1024)
print "Message Received:" , data
sock.close()[/code]

[bvdet]

Please use code tags when posting code. See posting guidelines here.

BV - Moderator