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