python获取网卡字节流的代码举例

#getInterfaceBytes 
    # -*- coding: cp936 -*- 
    import pcap 
    import dpkt 
     
    aaa='a' 
    bbb='b' 
    pc=pcap.pcap()    #注，参数可为网卡名，如eth0 
    pc.setfilter('tcp port 80')    #设置监听过滤器 
     
    for ptime,pdata in pc:    #ptime为收到时间，pdata为收到数据 
        p=dpkt.ethernet.Ethernet(pdata) 
        if p.data.__class__.__name__=='IP': 
            ip='%d.%d.%d.%d'%tuple(map(ord,list(p.data.dst))) 
            if p.data.data.__class__.__name__=='TCP': 
                if p.data.data.dport==80: 
                   #print p.data.data.data 
                   sStr1 = p.data.data.data 
                   sStr2 = 'Host: ' 
                   sStr3 = 'Connection' 
                   sStr4 = 'GET /' 
                   sStr5 = ' HTTP/1.1' 
                   nPos = sStr1.find(sStr3) 
                   nPosa = sStr1.find(sStr5)                
                   for n in range(sStr1.find(sStr2)+6,nPos-1): 
                       aaa=sStr1[sStr1.find(sStr2)+6:n]                
                   for n in range(sStr1.find(sStr4)+4,nPosa+1):                
                       bbb=sStr1[sStr1.find(sStr4)+4:n] 
                   ccc=aaa+bbb 
                   print ccc