代码

1 from scapy.all import IP,TCP,sr
2 ans,unans=sr(IP(dst="192.168.1.128")/TCP(dport=[21,23,135,443,445],flags="A"),timeout=3)
3 for s,r in ans:
4     if s[TCP].dport == r[TCP].sport:
5         print(str(s[TCP].dport)+" is unfiltered")
7 for s in unans:
8     print(str(s[TCP].dport)+" is filtered")

先从scapy模块中导入需要的对象，进行用sr()函数进行扫描，类型为ACK扫描，最后遍历有返回的包和没返回的包，有返回的包表示端口未被过滤，无返回包表示端口已经被过滤