实现IEEE 802.3以太网帧封代码,Python代码库,德仔网

代码语言

代码分类

【Python】实现IEEE 802.3以太网帧封

作者:步山 / 发布于2014/11/10/ 1138

在Debian的环境下，用python简单的实现IEEE 802.3以太网帧封，界面用wxpython由于 python 标准库里没有 wxpython, 所以写界面前需要安装 wxpython, 基于 debian 的 Linux 系统： apt-get install python-wxgtk2.8 python-wxtools wx2.8-i18n需要 5 个静态文本框、 5 个可编辑文本框和两个按钮。对两个按钮添加时间处理程序。点击“执行”按钮可计算 FCS 和输出封装好的帧，点击“清空”可清空界面输入和输出的内容。


	#!/usr/bin/env python
	# -*- coding:utf8 -*-
	import wx
	import re
	import sys

	#将MAC地址转化为二进制字符串形式
	def replace(mac):
	 m = ''.join(re.split('[:-]',mac)) #正则表达式去掉多余字符
	 mac_str = ''
	 for i in range(len(m)):
	 temp = bin(int(m[i],16))[2:]
	 if len(temp)<4:
	 temp = (4-len(temp))*'0' + temp
	 mac_str += temp
	 return mac_str

	#将数据部分变成二进制字符串形式
	def str2bin(data_be):
	 data = ''
	 for i in range(len(data_be)):
	 temp = bin(ord(data_be[i]))[2:]
	 if len(temp)<8:
	 temp = (8-len(temp))*'0' + temp
	 data += temp
	 return data

	#长度变为二进制字符串形式
	def len2bin(data):
	 temp = bin(len(data))[2:]
	 if len(data)>1500:
	 print sys.stderr,"数据部分超过1500个字节"
	 return False
	 if len(temp)<16:
	 temp = (16-len(temp)) * '0' + temp
	 return temp

	#FCS算法
	def fcs(mac1,mac2,data):
	 a = replace(mac1) + replace(mac2) + len2bin(data) + str2bin(data) + 32*'0'
	 temp = int(a[:9],2)
	 i = 9
	 while i<=len(a):
	 if temp<256:num=0
	 else:num=263
	 temp = int(bin(temp^num)[2:]+a[i:i+1],2)
	 i += 1
	 return bin(temp)[2:]

	#封装成帧
	def calculation(mac1,mac2,data):
	 before = '10'*31 + '11'
	 data_after = ''
	 if len(data)<46:
	 data_after = data + (46 - len(data))*'0'
	 else:data_after=data
	 Fcs = fcs(mac1,mac2,data)
	 Fcs = (32 - len(Fcs))*'0'+Fcs
	 strbin = before + replace(mac2) + replace(mac1) + len2bin(data) + str2bin(data_after) + Fcs
	 strlist = re.findall('....',strbin)
	 strhex = ''
	 for i in range(len(strlist)):
	 strhex += hex(int(strlist[i],2))[2:]
	 return strhex

	#图形界面的设计,继承wx.Frame类
	class MyFrame(wx.Frame):

	 def __init__(self):
	 wx.Frame.__init__(self,None,-1,' IEEE以太网封装',size=(600,500))
	 self.panel = wx.Panel(self,-1)

	 self.mac_from = wx.StaticText(self.panel,-1," 源MAC地址:")
	 self.mac_text = wx.TextCtrl(self.panel,-1,size=(400,-1))
	 self.mac_text.SetInsertionPoint(0)
	 self.mac_text.SetValue('20:7c:8f:1f:3e:e1')

	 self.mac_to = wx.StaticText(self.panel,-1," 目的MAC地址:")
	 self.mac_to_text = wx.TextCtrl(self.panel,-1,size=(400,-1))
	 self.mac_to_text.SetInsertionPoint(0)

	 self.data = wx.StaticText(self.panel,-1," 数据部分:")
	 self.data_text =wx.TextCtrl(self.panel,-1,size=(400,100),style = wx.TE_MULTILINE)
	 self.data_text.SetInsertionPoint(0)

	 self.crc = wx.StaticText(self.panel,-1," CRC检测结果：")
	 self.crc_text = wx.TextCtrl(self.panel,-1,size=(400,-1))
	 self.crc_text.SetInsertionPoint(0)

	 self.end = wx.StaticText(self.panel,-1," 封装结果:")
	 self.end_text = wx.TextCtrl(self.panel,-1,style = wx.TE_MULTILINE,size=(400,200))
	 self.end_text.SetInsertionPoint(0)

	 #按钮事件
	 exButton = wx.Button(self.panel,label='执行',pos=(100,450),size=(80,25))
	 exButton.Bind(wx.EVT_BUTTON,self.ex)

	 clearButton = wx.Button(self.panel,label='清空',pos=(400,450),size=(80,25))
	 clearButton.Bind(wx.EVT_BUTTON,self.cle)

	 sizer = wx.FlexGridSizer(cols=2,hgap=6,vgap=6)
	 sizer.AddMany([self.mac_from,self.mac_text,self.mac_to,self.mac_to_text,self.data,self.data_text,self.crc,self.crc_text,self.end,self.end_text,exButton,clearButton])
	 self.panel.SetSizer(sizer)

	 #执行事件的函数
	 def ex(self,event):
	 mac1 = self.mac_text.GetValue()
	 mac2 = self.mac_to_text.GetValue()
	 if mac1=='' or mac2=='':
	 print sys.stderr,'输入的MAC地址不能为空' #标准错误输出
	 return
	 da = self.data_text.GetValue()

	 fcs_crc = fcs(mac1,mac2,da)
	 self.crc_text.SetValue(fcs_crc)
	 end = calculation(mac1,mac2,da)
	 self.end_text.SetValue(end)
	 event.Skip()

	 #清空事件函数
	 def cle(self,event):
	 self.mac_text.SetValue('20:7c:8f:1f:3e:e1')
	 self.mac_to_text.Clear()
	 self.data_text.Clear()
	 self.crc_text.Clear()
	 self.end_text.Clear()
	 event.Skip()

	class MyApp(wx.App):
	 def OnInit(self):
	 frame = MyFrame()
	 frame.Show()
	 return True

	def main():
	 MyApp(True).MainLoop()

	if __name__ == '__main__':
	 main()

试试其它关键字

　以太网　　帧封　　 IEEE　

同语言下

可能有用的

步山贡献的其它代码(75)