Python网络编程——通过指定的端口和协议找到服务名

1.通过指定的端口和协议找到对应的服务名，采用socket中getservbyprot()函数实现。

 import socket

 def find_service_name():
     protocolname = 'tcp'
     for port in [80, 25]:
         print("Port: %s => service name: %s" % (port, socket.getservbyport(port, protocolname)))

     print("Port: %s => service name: %s" % (53, socket.getservbyport(53, 'udp')))

 if __name__ == '__main__':
     find_service_name()

2.输出结果

 Port: 80 => service name: http
 Port: 25 => service name: smtp
 Port: 53 => service name: domain

3.socket.getservbyport()解释

 def getservbyport(port, protocolname=None): # real signature unknown; restored from __doc__
     """
     getservbyport(port[, protocolname]) -> string

     Return the service name from a port number and protocol name.
     The optional protocol name, if given, should be 'tcp' or 'udp',
     otherwise any protocol will match.
     """
     return
 # 获取对应端口的服务名