Python UDP broadcast PermissionError: [Errno 13] Permission denied

Posted 2020-08-22

/**********************************************************************
 * Python UDP broadcast PermissionError: [Errno 13] Permission denied
 * 说明：
 *     使用Python3做UDP广播，遇到这个权限问题，当时就一阵惊讶，第一看
 * 到这种无权限的问题。
 *
 *                                  2016-12-10 深圳 南山平山村 曾剑锋
 *********************************************************************/

一、参考文档：
    Python socket.error: [Errno 13] Permission denied
        http://stackoverflow.com/questions/11457676/python-socket-error-errno-13-permission-denied

二、错误：
    1. 错误现象：
        [[email protected] ~]#  python main.py 
        fdsaf
        Traceback (most recent call last):
          File "main.py", line 11, in <module>
            s.sendto(‘zengjf‘.encode(‘utf-8‘), address)  
        PermissionError: [Errno 13] Permission denied
        [[email protected] ~]#  
    2. 错误原因：
        Set the SO_BROADCAST option, if you actually mean to send to a broadcast address:
            s.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
    3. 测试代码：
        import socket

        address = (‘255.255.255.255‘, 50000)
        s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        s.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)

        while True:
            msg = input()
            if not msg:
                break
            s.sendto(‘zengjf‘.encode(‘utf-8‘), address)

        s.close()