Python Peer-to-peer way to achieve simple UDP hole

The original is my graduation design. Now take it out and share it. First of all, the author is lust, if the teacher found on the Internet This section of code can not say that my graduation design is online copy drop ha.

Using Python to do a peer-to-peer simple implementation, you can through the server to register the public IP and port, directly with other clients to communicate. This can only be achieved successfully under full symmetric NAT, with the Windows 2003 NAT service and VMware-band NAT tested successfully. Using iptables NAT is not a good line.

Beginners Python, the code is not very perfect, such as Logout did not write, only for reference.

Server-side code:

#!/usr/bin/python #coding: utf-8 import socket, sys, socketserver, threading, Thread, time Server_port = 1234 Sock = Socket.socket (socket.af_inet, socket. SOCK_DGRAM) sock.setsockopt (socket. Sol_socket, SOCKET.     
        SO_REUSEADDR, 1) sock.bind ((', server_port)) user_list = [] def server_handle (): While True: Cli_date, Cli_pub_add = Sock.recvfrom (8192) now_user = [] Headder = [] Cl    
            I_str = {} Headder = Cli_date.split (' \ t ') for one_line in headder:str = {}    
                
        str = One_line args = Str.split (': ') cli_str[args[0]] = args[1]    
            If cli_str[' type '] = = ' Login ': del cli_str[' type '] Now_user = cli_str    
            now_user[' cli_pub_ip '] = cli_pub_add[0] now_user[' cli_pub_port '] = cli_pub_add[1]    
           User_list.append (Now_user) toclient = ' info#%s login in successful, the info from server '%now_user[' user_name '] sock.sendto (Toclien T,cli_pub_add) print '-' *100 print '%s is already logged in, public network ip:%s port:%d\n "% (now_user[' user_name '],now_user[')    
                        Cli_pub_ip '],now_user[' cli_pub_port '] print "Below is the list of logged-in users for One_user in User_list: print ' Username:%s ip:%s public network port:%s private network ip:%s private network port:%s '% (one_user[' user_name '],one_user[' cli_pub_ip "],one_user    
            [' Cli_pub_port '],one_user[' private_ip '],one_user[' private_port '] elif cli_str[' type '] = = ' Alive ': Pass elif cli_str[' type '] = = ' logout ': Pass Elif    
                        cli_str[' type '] = = ' Getalluser ': print '-' *100 for One_user in user_list: toclient = ' getalluser#username:%s pub_ip:%s pub_port:%s pri_ip:%s '% (pri_port:%s ' one_user[' user_name ' Cli_pub_ip '],one_user['Cli_pub_port '],one_user[' private_ip '],one_user[' Private_port '] sock.sendto (toclient,cli_pub_a
    DD) If __name__ = = ' __main__ ': Thread.start_new_thread (Server_handle, ()) print ' server process started, waiting for client to connect ' While true:for one_user into user_list:toclient = ' keepconnect#111 ' Sock.sendto (to Client, (one_user[' cli_pub_ip '],one_user[' Cli_pub_port ')) Time.sleep (1)