Python實現TCP/IP協議下的連接埠轉寄及重新導向樣本

首先，我們用webpy寫一個簡單的網站，監聽8080連接埠，返回“Hello, EverET.org”的頁面。

然後我們使用我們的forwarding.py，在80連接埠和8080連接埠中間建立兩條通訊管道用於雙向通訊。

此時，我們通過80連接埠訪問我們的伺服器。

瀏覽器得到：

然後，我們在forwarding.py的輸出結果中可以看到瀏覽器和webpy之間的通訊內容。

代碼：

#!/usr/bin/env pythonimport sys, socket, time, threadingloglock = threading.Lock()def log(msg):  loglock.acquire()  try:    print '[%s]: \n%s\n' % (time.ctime(), msg.strip())    sys.stdout.flush()  finally:    loglock.release()class PipeThread(threading.Thread):  def __init__(self, source, target):    threading.Thread.__init__(self)    self.source = source    self.target = target  def run(self):    while True:      try:        data = self.source.recv(1024)        log(data)        if not data: break        self.target.send(data)      except:        break    log('PipeThread done')class Forwarding(threading.Thread):  def __init__(self, port, targethost, targetport):    threading.Thread.__init__(self)    self.targethost = targethost    self.targetport = targetport    self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)    self.sock.bind(('0.0.0.0', port))    self.sock.listen(10)  def run(self):    while True:      client_fd, client_addr = self.sock.accept()      target_fd = socket.socket(socket.AF_INET, socket.SOCK_STREAM)      target_fd.connect((self.targethost, self.targetport))      log('new connect')      # two direct pipe      PipeThread(target_fd, client_fd).start()      PipeThread(client_fd, target_fd).start()if __name__ == '__main__':  print 'Starting'  import sys  try:    port = int(sys.argv[1])    targethost = sys.argv[2]    try: targetport = int(sys.argv[3])    except IndexError: targetport = port  except (ValueError, IndexError):    print 'Usage: %s port targethost [targetport]' % sys.argv[0]    sys.exit(1)  #sys.stdout = open('forwaring.log', 'w')  Forwarding(port, targethost, targetport).start()

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