python - Paramiko 不执行命令或 shell - Python

Question

我正在使用 Paramiko在两个服务器之间运行 ssh 命令的库。我的“主” 服务器是一台 Fedora 18 机器，而我的“从” 是一台 Windows 7 机器。为了在 Windows 7 机器上运行 ssh 服务器，我安装了 FreeSSHd .配置freesshd后，我可以从Fedora 18机器ssh进入Windows机器并执行类似dir的命令。但是，当我尝试使用 Paramiko 这样做时，我没有同样的运气:

import paramiko
import os
import errno

"""
written by Philippe Ribeiro

class Connection
stabilishes the ssh connection between two servers
allowing the executing of commands remotely
"""
class Connection:

    def __init__( self, hostname, username, password):
        """Create a ssh client using the paramiko library
        """
        self.host = hostname
        self.user = username
        self.password = password
        self.port = 23
        self.sshclient = paramiko.SSHClient()
        self.username = username
        self.password = password

        try:        
            self.sshclient.load_system_host_keys()
            self.sshclient.set_missing_host_key_policy( paramiko.AutoAddPolicy() )

            self.sshclient.connect( hostname=self.host, port=self.port, 
                    username=self.username, password=self.password )

            self.sftpclient = self.sshclient.open_sftp()

        except SSHException, e:
            print e

        except AuthenticationException, e:
            print e

        except BadHostKeyException, e:
            print e

    def close(self):
        """Closes a client using the Connection class' API
        """
        self.sshclient.close()
        return

    def remove_directory(self, path):
        """Remove remote directory that may contain files
        It does not support directories that contain subdiretories
        """
        if self.exists(path):
            for filename in self.sftpclient.listdir(path):
                filepath = os.path.join(path, filename)
                self.sfptclient.remove(filepath)
            self.sftpclient.rmdir(path)

        return

    def exists(self, path):
        """Return True if the remote path exists
        """
        try:
            self.sfptclient.stat(path)

        except IOError, e:
            if e.errno == errno.ENOENT:
                return False
                raise
            else:
                return True

    def put_directory(self, localdir, remotedir):
        """Put a directory of files on the remote server
        Create the remote directory if it does not exist
        Does not support directories that contain subdirectories
        Return the number of files transferred
        """
        if not self.exists(remotedir):
             self.sftp.client.mkdir(remotedir)
        count = 0
        for filename in os.listdir(localdir):
             self.sftpclient.put(
                  os.path.join(localdir, filename),
                  os.path.join(remotedir, filename)
             )
             count += 1
        return count

"""
Just for testing purposes
try to connect to a Windows machine from a Unix one
so it can execute commands remotely
"""
cmd  = ["cd ..", "dir" ]
client = Connection("hostname", "username", "password")

try:
    for c in cmd:
            stdin, stdout, stderr = client.sshclient.exec_command(c)
            print stdout.readlines()

except SSHException, e:
    print e

client.close()

但是当我执行时:

python client.py

我得到:

['Unable to execute command or shell on remote system: Failed to Execute process.\r\n']
['Unable to execute command or shell on remote system: Failed to Execute process.\r\n']

有人可以告诉我为什么不起作用吗？我错过了什么吗？

Answer 1

将 cmd = ["cd .., "dir"] 替换为 cmd = ['cmd.exe/c "cd C:\&& dir"' ]