我有这样的代码：

#!/usr/bin/python

# -*- coding: utf-8 -*-

import tkMessageBox as box

import time

from tkFileDialog import askopenfilename,asksaveasfilename

import pcapy

from impacket import ImpactDecoder, ImpactPacket

import thread

import sys

import tkMessageBox

from Tkinter import Tk, Text, BOTH, W, N, E, S, StringVar, END, Listbox

from ttk import Frame, Button, Label, Style

class Program(Frame):

def __init__(self, parent):

Frame.__init__(self, parent)

self.parent = parent

self.initUI()

def initUI(self):

self.parent.title("Wąchacz")

self.style = Style()

self.style.theme_use("default")

self.pack(fill=BOTH, expand=1)

devices = pcapy.findalldevs()

acts = devices

lb = Listbox(self)

for i in acts:

lb.insert(END, i)

self.columnconfigure(1, weight=1)

self.columnconfigure(3, pad=7)

self.rowconfigure(3, weight=1)

self.rowconfigure(5, pad=7)

lbl = Label(self, text="Wybierz interface:")

lbl.grid(sticky=W, pady=4, padx=5)

lb.bind("<>", self.onSelect)

lb.grid(row=1, column=0, columnspan=2, rowspan=4,

padx=5, sticky=E+W+S+N)

self.var = StringVar()

self.columnconfigure(1, weight=1)

self.columnconfigure(3, pad=7)

self.rowconfigure(3, weight=1)

self.rowconfigure(5, pad=7)

abtn = Button(self, text="Start", command=self.start)

abtn.grid( row=1, column=3)

bbtn = Button(self, text="Stop", command=self.threadinterrupt)

bbtn.grid(row=2, column=3, pady=4)

cbtn = Button(self, text="Otwórz", command=self.OpenFile)

cbtn.grid(row=3, column=3, pady=4)

dbtn = Button(self, text="Zapisz", command=self.SaveFile)

dbtn.grid(row=4, column=3, pady=4)

ebtn = Button(self, text="O programie...", command=self.onAbout)

ebtn.grid( row=5, column=3, pady=4)

fbtn = Button(self, text="Zamknij", command=self.quitGui)

fbtn.grid( row=5, column=0, pady=10)

def start(self):

try:

thread.start_new_thread(eth_addr,())

except (KeyboardInterrupt, SystemExit):

cleanup_stop_thread();

sys.exit()

def threadinterrupt(self):

thread.interrupt_main()

def OpenFile(self):

name = askopenfilename(filetypes=[("Pliki PCAP","*.pcap")],title="Otwórz plik pcap")

def SaveFile(self):

asksaveasfilename(filetypes=[("Pliki PCAP","*.pcap")],title="Zapisz plik pcap")

def quitGui(self):

answer = box.askquestion('wyjscie', "Napewno chcesz wyjść? ")

if answer == 'yes':

self.quit()

def onAbout(self):

box.showinfo("O programie", '''monitorowanie ruchu sieciowego''')

def onSelect(self, val):

interface1 = val.widget

idx = interface1.curselection()

value = interface1.get(idx)

self.var.set(value)

def eth_addr(a) :

b = "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x" % (ord(a[0]) , ord(a[1]) , ord(a[2]), ord(a[3]), ord(a[4]) , ord(a[5]))

return b

global interface1

interface1 = str(var1.get())

try:

s = socket.socket( socket.AF_PACKET , socket.SOCK_RAW , socket.ntohs(0x0003))

except socket.error, msg:

print 'Kod błędu : ' + str(msg[0]) + ' Wiadomość ' + msg[1]

sys.exit()

while True:

packet = s.recvfrom(interface1 , 65536, True, 1000)

packet = packet[0]

eth_length = 14

eth_header = packet[:eth_length]

eth = unpack('!6s6sH' , eth_header)

eth_protocol = socket.ntohs(eth[2])

print 'Docelowy adres MAC : ' + eth_addr(packet[0:6]) + ' Źródłowy adres MAC : ' + eth_addr(packet[6:12]) + ' Protokół : ' + str(eth_protocol)

if eth_protocol == 8 :

ip_header = packet[eth_length:20+eth_length]

iph = unpack('!BBHHHBBH4s4s' , ip_header)

version_ihl = iph[0]

version = version_ihl >> 4

ihl = version_ihl & 0xF

iph_length = ihl * 4

ttl = iph[5]

protocol = iph[6]

s_addr = socket.inet_ntoa(iph[8]);

d_addr = socket.inet_ntoa(iph[9]);

print 'Wersja : ' + str(version) + ' Długość nagłówka IP : ' + str(ihl) + ' TTL : ' + str(ttl) + ' Protokół : ' + str(protocol) + ' Adres źródłowy : ' + str(s_addr) + ' Adres docelowy : ' + str(d_addr)

if protocol == 6 :

t = iph_length + eth_length

tcp_header = packet[t:t+20]

tcph = unpack('!HHLLBBHHH' , tcp_header)

source_port = tcph[0]

dest_port = tcph[1]

sequence = tcph[2]

acknowledgement = tcph[3]

doff_reserved = tcph[4]

tcph_length = doff_reserved >> 4

print 'Port źródłowy : ' + str(source_port) + ' Port docelowy : ' + str(dest_port) + ' Numer sekwencji : ' + str(sequence) + ' Potwierdzenie : ' + str(acknowledgement) + ' Długość nagłówka TCP : ' + str(tcph_length)

h_size = eth_length + iph_length + tcph_length * 4

data_size = len(packet) - h_size

data = packet[h_size:]

print 'Dane : ' + data

elif protocol == 1 :

u = iph_length + eth_length

icmph_length = 4

icmp_header = packet[u:u+4]

icmph = unpack('!BBH' , icmp_header)

icmp_type = icmph[0]

code = icmph[1]

checksum = icmph[2]

print 'Typ : ' + str(icmp_type) + ' Kod : ' + str(code) + ' Suma kontrolna : ' + str(checksum)

h_size = eth_length + iph_length + icmph_length

data_size = len(packet) - h_size

data = packet[h_size:]

print 'Dane : ' + data

elif protocol == 17 :

u = iph_length + eth_length

udph_length = 8

udp_header = packet[u:u+8]

udph = unpack('!HHHH' , udp_header)

source_port = udph[0]

dest_port = udph[1]

length = udph[2]

checksum = udph[3]

print 'Port źródłowy : ' + str(source_port) + ' Port docelowy : ' + str(dest_port) + ' Długość : ' + str(length) + ' Suma kontrolna : ' + str(checksum)

h_size = eth_length + iph_length + udph_length

data_size = len(packet) - h_size

data = packet[h_size:]

print 'Dane : ' + data

else :

print 'Protokół inny niż TCP/UDP/ICMP'

print

def main():

root = Tk()

root.geometry("350x300+300+300")

app = Program(root)

root.mainloop()

if __name__ == '__main__':

main()

但按下启动按钮后，我有一个追溯：

Tkinter回调中的异常回溯(最近一次调用最后一次)：文件“/usr/lib/python2.7/lib-tk/Tkinter.py”，第1489行，在调用中返回self.func(* args)文件“示例 . py“，第80行，在start thread.start_new_thread(eth_addr，())NameError：未定义全局名称'eth_addr'

有人可以帮我解决这个全局名称问题吗？