从 python 发起 SSH 隧道的问题 [英] Problem originating SSH tunnels from python

问题描述

目标是在卫星服务器和中央注册数据库之间建立 n 个 ssh 隧道.我已经在我的服务器之间设置了公钥身份验证，因此它们无需密码提示即可直接登录.怎么办 ?我试过Paramiko.看起来不错，但仅仅设置一个基本的隧道就变得非常复杂，尽管代码示例会被欣赏.我试过 Autossh，它在建立一个工作隧道后 2 分钟就死了，太奇怪了！希望有人可以帮助我提供一个简单的代码片段，我可以使用 supervisord 或 monit 对其进行守护进程和监视.

The object is to set up n number of ssh tunnels between satellite servers and a centralized registry database. I have already set up public key authentication between my servers so they just log right in without password prompts. Now what ? I've tried Paramiko. It seems decent but gets pretty complicated just to set up a basic tunnel, although code exmplaes would be aprreciated. I've tried Autossh and it dies 2 minutes after setting up a working tunnel, bizarre! Hopefully someone can help me with a simple code snippet that I can daemonize and monitor with supervisord or monit.

推荐答案

这里是 脚本 亚历克斯给你指的.

Here is a cutdown version of the script that Alex pointed you to.

它只是连接到 192.168.0.8 并将端口 3389 从 192.168.0.6 转发到本地主机

It simply connects to 192.168.0.8 and forwards port 3389 from 192.168.0.6 to localhost

import select
import SocketServer
import sys
import paramiko

class ForwardServer(SocketServer.ThreadingTCPServer):
    daemon_threads = True
    allow_reuse_address = True

class Handler (SocketServer.BaseRequestHandler):
    def handle(self):
        try:
            chan = self.ssh_transport.open_channel('direct-tcpip', (self.chain_host, self.chain_port), self.request.getpeername())
        except Exception, e:
            print('Incoming request to %s:%d failed: %s' % (self.chain_host, self.chain_port, repr(e)))
            return
        if chan is None:
            print('Incoming request to %s:%d was rejected by the SSH server.' % (self.chain_host, self.chain_port))
            return

        print('Connected!  Tunnel open %r -> %r -> %r' % (self.request.getpeername(), chan.getpeername(), (self.chain_host, self.chain_port)))
        while True:
            r, w, x = select.select([self.request, chan], [], [])
            if self.request in r:
                data = self.request.recv(1024)
                if len(data) == 0:
                    break
                chan.send(data)
            if chan in r:
                data = chan.recv(1024)
                if len(data) == 0:
                    break
                self.request.send(data)
        chan.close()
        self.request.close()
        print('Tunnel closed from %r' % (self.request.getpeername(),))

def main():
    client = paramiko.SSHClient()
    client.load_system_host_keys()
    client.set_missing_host_key_policy(paramiko.WarningPolicy())
    client.connect("192.168.0.8")

    class SubHandler(Handler):
        chain_host = "192.168.0.6"
        chain_port = 3389
        ssh_transport = client.get_transport()

    try:
        ForwardServer(('', 3389), SubHandler).serve_forever()
    except KeyboardInterrupt:
        sys.exit(0)

if __name__ == '__main__':
    main()

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