Starting Python... some questions

jezzzz . jezonthenet at yahoo.com
Tue Mar 13 21:53:14 CET 2007


All,

thank you for your responses. I learned much and made some modifications in my small program. Currently I am attempting to put together a packet that contains a Python message (created using struct.pack) and a Scapy message (Ether()). Having a packet with combined payload from Python and Scapy doesn't seem to work the way I do it: 
ether = scapy.Ether(dst="01:02:03:04:05:06")
payload = ether + payload (where payload is the chassis_id)

I get as error:
  File "lldp.py", line 23, in main
    fullpayload = ether + payload
TypeError: unsupported operand type(s) for +: 'Ether' and 'str'

I'm thinking instead to just use Python to create the Ethernet Frame as well and then send the packet off. How difficult is this? I could only find references online on how to send TCP/UDP packets but no information on how to send a packet with a Layer1 and Layer2 only. The ethernet frame should only contain a destination MAC, a source MAC and a type (88cc). Any advice on how to create such a packet and send it? (if anyone knows of an easy way to use a hybrid of Python and Scapy, that's fine by me as well).

Thanks!


class lldp_class:
    def __init__(self):
        self.chassis_id_tlv = None
    
    def chassis_id(self, subtype, chassis_info):
        if subtype == 4:
            chassis_data_int = [int(x,16) for x in chassis_info.split(":")]            
            chassis_data = struct.pack("6B", *chassis_data_int)
        subtype_data = struct.pack("!B",subtype)
        self.chassis_id_tlv = subtype_data + chassis_data

def main():
    p = lldp_class()
    p.chassis_id(4, "01:80:C2:00:00:0E")
    payload = p.chassis_id_tlv
    ether = scapy.Ether(dst="01:02:03:04:05:06")
    fullpayload = ether + payload
    sendp(fullpayload)

main()






 
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