proxy.py 文件源码

def create_forward_port(
        self, port, forward_address, forward_port, address=None,
            remote=False, **connect_kwargs):
        """
        Warning: This can be a security issue for long running tunnels because
        bind_address does not work like ssh, instead it default to binding
        on every interface.  SSH defaults to binding to localhost.
        """
        args = self._get_args(**connect_kwargs)
        remote_flag = "R" if remote else "L"
        args.append("-{0}{1}:{2}:{3}:{4}".format(
            remote_flag, address or "0.0.0.0", port,
            forward_address, forward_port))
        hostname = connect_kwargs.get("hostname", self.hostname)
        address = address or hostname if remote else "localhost"
        proc = subprocess.Popen(args, preexec_fn=os.setsid)
        return PortForward(proc.pid, address=address, port=port)