Python中P2P方式實現簡單的udp打洞

原來是本人的畢業設計。現在拿出來共用下。先申明，作者是lust，老師如果在網上搜到這段代碼可不要說我的畢業設計是網上copy滴哈。

用python做了一個P2P的簡單實現，可以通過在服務端註冊公網IP和連接埠後，直接和其它用戶端進行通訊。目前只能在完全對稱NAT下成功實現，在window 2003 nat服務和vmware內建的nat下測試成功。用iptables的nat不可行。

初學Python，代碼不是很完善，比如logout沒有寫，只供參考。

Server端代碼：

#!/usr/bin/python    #coding:utf-8    import socket, sys, SocketServer, threading, thread, time    SERVER_PORT = 1234sock = 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 = []            cli_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(toclient,cli_pub_add)                print '-'*100            print "%s 已經登入,公網IP:%s 連接埠:%d\n"%(now_user['user_name'],now_user['cli_pub_ip'],now_user['cli_pub_port'])                print "以下是已經登入的使用者列表"            for one_user in user_list:                            print '使用者名稱:%s 公網ip:%s 公網連接埠:%s 私網ip:%s 私網連接埠:%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'],one_user['cli_pub_ip'],one_user['cli_pub_port'],one_user['private_ip'],one_user['private_port'])                            sock.sendto(toclient,cli_pub_add)    if __name__ == '__main__':        thread.start_new_thread(server_handle, ())        print '伺服器處理序已啟動，等待客戶串連'    while True:            for one_user in user_list:                toclient = 'keepconnect#111'            sock.sendto(toclient,(one_user['cli_pub_ip'],one_user['cli_pub_port']))                 time.sleep(1)