网络端口的转发和重定向

需要将某个网络端口转发到另外一个主机(forwarding),但可能会是不同的端口(redirecting)

import sys, socket, time, threading
LOGGING = True
loglock = threading.Lock()
def log(s, *a):
    if LOGGING:
        loglock.acquire()
        try:
            print '%s:%s' %(time.ctime(), (s%a))
            sys.stdout.flush()
        finally:
            loglock.release()

class PipeThread(threading.Thread):
    pipes = [ ]
    pipeslock = threading.Lock()
    def __init__(self, source, sink):
        super(PipeThread,self).__init__()
        self.source = source
        self.sink = sink
        log('Creating new pipe thread %s ( %s -> %s)',self, source.getpeername(), sink.getpeername())
        self.pipeslock.acquire()
        try:
            self.pipes.append(self)
        finally:
            self.pipeslock.release()
        self.pipeslock.acquire()
        try:
            pipes_now = len(self.pipes)
        finally:
            self.pipeslock.release()
        log('%s pipes now active', pipes_now)

    def run(self):
        while True:
            try:
                data = self.source.recv(1024)
                if not data: 
                    break
                self.sink.send(data)
            except:
                break
        log('%s terminating', self)
        self.pipeslock.acquire()
        try:
            self.pipes.remove(self)
        finally:
            self.pipeslock.release()
        self.pipeslock.acquire()
        try:
            pipes_left = len(self.pipes)
        finally:
            self.pipeslock.release()
        log('%s pipes still active', pipes_left)


class Pinhole(threading.Thread):
    def __init__(self, port, newhost, newport):
        super(Pinhole,self).__init__()
        log('Redirecting:localhost:%s -> %s:%s', port,newhost,newport)
        self.newhost = newhost
        self.newport = newport
        self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.sock.bind(('', port))
        self.sock.listen(5)
    def run(self):
        while True:
            newsock, address = self.sock.accept()
            log('Creating new session for %s:%s', *address)
            fwd = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            fwd.connect((self.newhost, self.newport))
            PipeThread(newsock,fwd).start()
            PipeThread(fwd, newsock).start()

if __name__ == '__main__':
    print 'Starting Pinhole port forwarder/redirector'
    import sys
    try:
        port = int(sys.argv[1])
        newhost = sys.argv[2]
        try:
            newport = int(sys.argv[3])
        except IndexError:
            newport = port
    except (ValueError, IndexError):
        print 'Usage: %s port newhost [newport]' % sys.argv[0]
        sys.exit(1)

    #begin to work
    sys.stdout = open('pinhole.log','w')
    Pinhole(port, newhost, newport).start()

#python redirectport.py 8000 localhost 80

Sat Aug 25 08:38:55 2012:Creating new session for 127.0.0.1:49618
Sat Aug 25 08:38:55 2012:Creating new pipe thread <PipeThread(Thread-16, initial)> ( ('127.0.0.1', 49618) -> ('127.0.0.1', 80))
Sat Aug 25 08:38:55 2012:3 pipes now active
Sat Aug 25 08:38:55 2012:Creating new pipe thread <PipeThread(Thread-17, initial)> ( ('127.0.0.1', 80) -> ('127.0.0.1', 49618))
Sat Aug 25 08:38:55 2012:4 pipes now active
Sat Aug 25 08:38:55 2012:Creating new session for 127.0.0.1:49619
Sat Aug 25 08:38:55 2012:Creating new pipe thread <PipeThread(Thread-18, initial)> ( ('127.0.0.1', 49619) -> ('127.0.0.1', 80))
Sat Aug 25 08:38:55 2012:5 pipes now active
Sat Aug 25 08:38:55 2012:Creating new pipe thread <PipeThread(Thread-19, initial)> ( ('127.0.0.1', 80) -> ('127.0.0.1', 49619))
Sat Aug 25 08:38:55 2012:6 pipes now active
Sat Aug 25 08:39:08 2012:<PipeThread(Thread-17, started 140323525043968)> terminating
Sat Aug 25 08:39:08 2012:5 pipes still active
Sat Aug 25 08:39:09 2012:<PipeThread(Thread-19, started 140323550222080)> terminating
Sat Aug 25 08:39:09 2012:4 pipes still active
Sat Aug 25 08:39:10 2012:<PipeThread(Thread-18, started 140323541829376)> terminating
Sat Aug 25 08:39:10 2012:3 pipes still active
Sat Aug 25 08:39:10 2012:<PipeThread(Thread-16, started 140323592185600)> terminating
Sat Aug 25 08:39:10 2012:2 pipes still active