Python HostKeys.iteritems方法代码示例

# 需要导入模块: from paramiko.hostkeys import HostKeys [as 别名]
# 或者: from paramiko.hostkeys.HostKeys import iteritems [as 别名]
class SSHClient (object):
    """
    A high-level representation of a session with an SSH server.  This class
    wraps L{Transport}, L{Channel}, and L{SFTPClient} to take care of most
    aspects of authenticating and opening channels.  A typical use case is::
    
        client = SSHClient()
        client.load_system_host_keys()
        client.connect('ssh.example.com')
        stdin, stdout, stderr = client.exec_command('ls -l')
        
    You may pass in explicit overrides for authentication and server host key
    checking.  The default mechanism is to try to use local key files or an
    SSH agent (if one is running).
    
    @since: 1.6
    """

    def __init__(self):
        """
        Create a new SSHClient.
        """
        self._system_host_keys = HostKeys()
        self._host_keys = HostKeys()
        self._host_keys_filename = None
        self._log_channel = None
        self._policy = RejectPolicy()
        self._transport = None
    
    def load_system_host_keys(self, filename=None):
        """
        Load host keys from a system (read-only) file.  Host keys read with
        this method will not be saved back by L{save_host_keys}.
        
        This method can be called multiple times.  Each new set of host keys
        will be merged with the existing set (new replacing old if there are
        conflicts).
        
        If C{filename} is left as C{None}, an attempt will be made to read
        keys from the user's local "known hosts" file, as used by OpenSSH,
        and no exception will be raised if the file can't be read.  This is
        probably only useful on posix.

        @param filename: the filename to read, or C{None}
        @type filename: str
        
        @raise IOError: if a filename was provided and the file could not be
            read
        """
        if filename is None:
            # try the user's .ssh key file, and mask exceptions
            filename = os.path.expanduser('~/.ssh/known_hosts')
            try:
                self._system_host_keys.load(filename)
            except IOError:
                pass
            return
        self._system_host_keys.load(filename)
        
    def load_host_keys(self, filename):
        """
        Load host keys from a local host-key file.  Host keys read with this
        method will be checked I{after} keys loaded via L{load_system_host_keys},
        but will be saved back by L{save_host_keys} (so they can be modified).
        The missing host key policy L{AutoAddPolicy} adds keys to this set and
        saves them, when connecting to a previously-unknown server.
        
        This method can be called multiple times.  Each new set of host keys
        will be merged with the existing set (new replacing old if there are
        conflicts).  When automatically saving, the last hostname is used.
        
        @param filename: the filename to read
        @type filename: str

        @raise IOError: if the filename could not be read
        """
        self._host_keys_filename = filename
        self._host_keys.load(filename)
    
    def save_host_keys(self, filename):
        """
        Save the host keys back to a file.  Only the host keys loaded with
        L{load_host_keys} (plus any added directly) will be saved -- not any
        host keys loaded with L{load_system_host_keys}.
        
        @param filename: the filename to save to
        @type filename: str
        
        @raise IOError: if the file could not be written
        """
        f = open(filename, 'w')
        f.write('# SSH host keys collected by paramiko\n')
        for hostname, keys in self._host_keys.iteritems():
            for keytype, key in keys.iteritems():
                f.write('%s %s %s\n' % (hostname, keytype, key.get_base64()))
        f.close()
    
    def get_host_keys(self):
        """
        Get the local L{HostKeys} object.  This can be used to examine the
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