具備簡單的管理功能，運行后 telnet localhost 9000 端口可以進行管理主要功能就是做包轉發，如果有一個橋服務器，可以用來外網訪問內網用，還是很管用的

#/bin/env python

coding:utf-8
import socket,select,sys,time

import thread
s_list = []
def loop(cs,addr,s_ip,s_port):

    print '%s %d connected.' % addr

    ts = socket.socket()

try:    
    ts.connect((s_ip,s_port))    
except:    
    cs.close()    
    print '%s %d closed.' % addr    
    sys.exit(0)    

while True:    

    rl,wl,xl = select.select([cs.fileno(),ts.fileno()],[],[cs.fileno(),ts.fileno()])    

    if len(xl) > 0:    
        cs.close()    
        ts.close()    
        print '%s %d closed.' % addr    
        sys.exit(0)    

    if len(rl) > 0:    
        if rl[0] == cs.fileno():    
            rs = ts    
            ws = cs    
        else:    
            rs = cs    
            ws = ts    

        try:    
            buffer = ws.recv(10000)    
            if len(buffer) == 0:    
                raise   
            rs.send(buffer)    
        except:    
            rs.close()    
            ts.close()    
            print '%s %d closed.' % addr    
            sys.exit(0)    


def mainserver(l_port,s_ip,s_port):

    global s_list

    try:

        ss = socket.socket()

        ss.bind(('0.0.0.0',l_port))

        ss.listen(10)

        s_list.append((l_port,s_ip,s_port))

    except:

        sys.exit(0)

while True:    
    cs,addr = ss.accept()    

    thread.start_new_thread(loop,(cs,addr,s_ip,s_port))    


def manager(l_port):

    global start,s_list

ss = socket.socket()    
ss.bind(('0.0.0.0',l_port))    
ss.listen(10)    

while True:    
    cs,addr = ss.accept()    
    cs.send("""trans server 1.0\\r\\ntype 'help' to get help\\r\\n""")    
    buffer = ''    
    while True:    
        buf = cs.recv(10000)    
        if len(buf) == 0:    
            cs.close()    
            break   
        if buf[-1] not in ('\\r','\\n'):    
            buffer += buf    
            continue   
        buffer += buf    
        cmd = buffer.strip()    
        buffer = ''    
        if cmd == 'exit':    
            cs.close()    
            break   
        elif cmd == 'stop':    
            start = 0   
            cs.close()    
            sys.exit(0)    
        elif cmd == 'list':    
            b = ''    
            for l in s_list:    
                b += '%4d %s:%d\\r\\n' % l    

            if len(b) > 0:    
                cs.send(b)    
        elif cmd in ('help','?'):    
            cs.send("""-------------------------------------------\\r  

exit\r

    exit telnet\r

start localport serverip:serverport\r

    start a new server\r

list\r

    list all server\r

-------------------------------------------\r

""")

            else:

                cmds = cmd.split(" ",1)

                if len(cmds) > 1 and cmds[0] == 'start':

                    args = cmds[1].strip().split(" ",1)

                    if len(args) != 2:

                        cs.send('start localport serverip:serverport\r\n')

                        continue

                    arg = args[1].split(":",1)

                    if len(arg) != 2:

                        cs.send('start localport serverip:serverport\r\n')

                        continue

                try:    
                    l_port = int(args[0])    
                    s_ip = arg[0]    
                    s_port = int(arg[1])    
                except:    
                    cs.send('start localport serverip:serverport\\r\\n')    
                    continue   

                thread.start_new_thread(mainserver,(l_port,s_ip,s_port))    
                cs.send('start OK!\\r\\n')    
            else:    
                cs.send('no command [%s]\\r\\n' % cmd)    
                continue   


def main():

    global start

if len(sys.argv) == 3:    
    try:    
        l_port = int(sys.argv[1])    
        s_ip,s_port = sys.argv[2].split(":")    
        s_port = int(s_port)    
        thread.start_new_thread(mainserver,(l_port,s_ip,s_port))    
    except:    
        pass   

start = 1   

thread.start_new_thread(manager,(9000,))    

while start:    
    time.sleep(1)    


if name == 'main':

start = 0   

main()</pre>