show protocol in gdb debug

show_protocol.py

from scapy.all import *
from scapy.layers.http import *
import gdb


class ShowProcto(gdb.Command):
    """
    Usage: xpr/size memaddr procto_type
    Exaple:
    (gdb) xpr/20 0x7fffffffe238 TCP
    """

    def __init__(self):

        super(self.__class__,self).__init__("xpr",gdb.COMMAND_USER)


    def invoke(self,args,from_ttt):
        argv = gdb.string_to_argv(args)

        func = Ether
        if len(argv) < 2:
            raise gdb.GdbError("args too short,type help xpr")
        if len(argv) > 2:
            func = getattr(scapy.all,argv[2])

        startAddr = int(argv[1],16)
        bytesLen = int(argv[0][1:])

        proc = gdb.inferiors()[0]
        data = proc.read_memory(startAddr,bytesLen).tobytes()

        if func(data).show_summary:
            func(data).show2()
        else:
            raise
ShowProcto()