Question

I am running a server application on a PC which receives UDP packets from a client. The UDP packets are received (verified in WireShark), but include the wrong checksum. I have no control over the client and need to be able to receive these packets in Python. The following code doesn’t see the packets:

UDPSock = socket(AF_INET,SOCK_DGRAM)
UDPSock.bind(addr)

while 1:
    data,addr = UDPSock.recvfrom(buf)
    if not data:
        print "Client has exited!"
        break
    else:
        print "\nReceived message '", data,"'"

UDPSock.close()

Anyway in Python I can receive malformed UDP packets?

Answer 1

Found the solution.

I used the pycap library in combination with dpkt. The pycap module is outdated, for older versions of Python, but in the “Issues” someone posted updated binaries.