Revision 5a684638
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# Copyright 2009 Shikhar Bhushan |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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|
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import logging |
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logger = logging.getLogger('ncclient.session') |
/dev/null | ||
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# Copyright 2009 Shikhar Bhushan |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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|
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class Capabilities: |
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def __init__(self, capabilities=None): |
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self._dict = {} |
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if isinstance(capabilities, dict): |
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self._dict = capabilities |
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elif isinstance(capabilities, list): |
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for uri in capabilities: |
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self._dict[uri] = Capabilities.guess_shorthand(uri) |
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|
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def __contains__(self, key): |
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return ( key in self._dict ) or ( key in self._dict.values() ) |
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|
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def __iter__(self): |
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return self._dict.keys().__iter__() |
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def __repr__(self): |
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return repr(self._dict.keys()) |
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def add(self, uri, shorthand=None): |
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if shorthand is None: |
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shorthand = Capabilities.guess_shorthand(uri) |
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self._dict[uri] = shorthand |
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set = add |
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def remove(self, key): |
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if key in self._dict: |
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del self._dict[key] |
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else: |
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for uri in self._dict: |
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if self._dict[uri] == key: |
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del self._dict[uri] |
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break |
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|
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@staticmethod |
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def guess_shorthand(uri): |
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if uri.startswith('urn:ietf:params:netconf:capability:'): |
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return (':' + uri.split(':')[5]) |
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CAPABILITIES = Capabilities([ |
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'urn:ietf:params:netconf:base:1.0', |
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'urn:ietf:params:netconf:capability:writable-running:1.0', |
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'urn:ietf:params:netconf:capability:candidate:1.0', |
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'urn:ietf:params:netconf:capability:confirmed-commit:1.0', |
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'urn:ietf:params:netconf:capability:rollback-on-error:1.0', |
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'urn:ietf:params:netconf:capability:startup:1.0', |
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'urn:ietf:params:netconf:capability:url:1.0', |
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'urn:ietf:params:netconf:capability:validate:1.0', |
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'urn:ietf:params:netconf:capability:xpath:1.0', |
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'urn:ietf:params:netconf:capability:notification:1.0', |
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'urn:ietf:params:netconf:capability:interleave:1.0' |
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]) |
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if __name__ == "__main__": |
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assert(':validate' in CAPABILITIES) # test __contains__ |
/dev/null | ||
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# Copyright 2009 Shikhar Bhushan |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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|
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from ncclient import ClientError |
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class SessionError(ClientError): |
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pass |
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class SSHError(SessionError): |
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pass |
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class SSHUnknownHostError(SSHError): |
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def __init__(self, hostname, key): |
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self.hostname = hostname |
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self.key = key |
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def __str__(self): |
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from binascii import hexlify |
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return ('Unknown host key [%s] for [%s]' % |
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(hexlify(self.key.get_fingerprint()), self.hostname)) |
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|
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class SSHAuthenticationError(SSHError): |
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pass |
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class SSHSessionClosedError(SSHError): |
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def __init__(self, in_buf, out_buf=None): |
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SessionError.__init__(self, "Unexpected session close.") |
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self._in_buf, self._out_buf = in_buf, out_buf |
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def __str__(self): |
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msg = SessionError(self).__str__() |
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if self._in_buf: |
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msg += '\nIN_BUFFER: %s' % self._in_buf |
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if self._out_buf: |
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msg += '\nOUT_BUFFER: %s' % self._out_buf |
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return msg |
/dev/null | ||
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# Copyright 2009 Shikhar Bhushan |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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|
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from threading import Thread, Lock, Event |
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from Queue import Queue |
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from . import logger |
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from capabilities import Capabilities, CAPABILITIES |
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class Subject: |
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def __init__(self): |
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self._listeners = set([]) |
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self._lock = Lock() |
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def has_listener(self, listener): |
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with self._lock: |
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return (listener in self._listeners) |
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def add_listener(self, listener): |
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with self._lock: |
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self._listeners.add(listener) |
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def remove_listener(self, listener): |
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with self._lock: |
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self._listeners.discard(listener) |
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def dispatch(self, event, *args, **kwds): |
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# holding the lock while doing callbacks could lead to a deadlock |
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# if one of the above methods is called |
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with self._lock: |
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listeners = list(self._listeners) |
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for l in listeners: |
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try: |
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logger.debug('dispatching [%s] to [%s]' % (event, l)) |
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getattr(l, event)(*args, **kwds) |
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except Exception as e: |
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pass # if a listener doesn't care for some event we don't care |
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class Session(Thread, Subject): |
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def __init__(self): |
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Thread.__init__(self, name='session') |
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Subject.__init__(self) |
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self._client_capabilities = CAPABILITIES |
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self._server_capabilities = None # yet |
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self._id = None # session-id |
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self._q = Queue() |
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self._connected = False # to be set/cleared by subclass implementation |
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def _post_connect(self): |
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from ncclient.content.builders import HelloBuilder |
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self.send(HelloBuilder.build(self._client_capabilities)) |
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error = None |
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init_event = Event() |
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def ok_cb(id, capabilities): |
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self._id, self._capabilities = id, Capabilities(capabilities) |
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init_event.set() |
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def err_cb(err): |
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error = err |
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init_event.set() |
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listener = HelloListener(ok_cb, err_cb) |
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self.add_listener(listener) |
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# start the subclass' main loop |
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self.start() |
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# we expect server's hello message |
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init_event.wait() |
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# received hello message or an error happened |
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self.remove_listener(listener) |
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if error: |
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raise error |
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logger.debug('initialized:session-id:%s' % self._id) |
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def send(self, message): |
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logger.debug('queueing:%s' % message) |
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self._q.put(message) |
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def connect(self): |
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raise NotImplementedError |
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def run(self): |
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raise NotImplementedError |
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def capabilities(self, whose='client'): |
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if whose == 'client': |
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return self._client_capabilities |
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elif whose == 'server': |
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return self._server_capabilities |
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|
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### Properties |
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@property |
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def client_capabilities(self): |
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return self._client_capabilities |
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@property |
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def server_capabilities(self): |
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return self._server_capabilities |
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@property |
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def connected(self): |
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return self._connected |
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@property |
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def id(self): |
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return self._id |
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class HelloListener: |
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def __init__(self, init_cb, error_cb): |
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self._init_cb, self._error_cb = init_cb, error_cb |
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def __str__(self): |
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return 'HelloListener' |
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### Events |
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def received(self, raw): |
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logger.debug(raw) |
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from ncclient.content.parsers import HelloParser |
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try: |
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id, capabilities = HelloParser.parse(raw) |
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except Exception as e: |
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self._error_cb(e) |
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else: |
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self._init_cb(id, capabilities) |
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def error(self, err): |
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self._error_cb(err) |
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class DebugListener: |
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def __str__(self): |
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return 'DebugListener' |
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def received(self, raw): |
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logger.debug('DebugListener:[received]:%s' % raw) |
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def error(self, err): |
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logger.debug('DebugListener:[error]:%s' % err) |
/dev/null | ||
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# Copyright 2009 Shikhar Bhushan |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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5 |
# You may obtain a copy of the License at |
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6 |
# |
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7 |
# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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10 |
# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
|
12 |
# See the License for the specific language governing permissions and |
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13 |
# limitations under the License. |
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|
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import os |
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import socket |
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from binascii import hexlify |
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from cStringIO import StringIO |
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from select import select |
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import paramiko |
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import session |
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from . import logger |
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from error import SSHError, SSHUnknownHostError, SSHAuthenticationError, SSHSessionClosedError |
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from session import Session |
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BUF_SIZE = 4096 |
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MSG_DELIM = ']]>]]>' |
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TICK = 0.1 |
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|
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class SSHSession(Session): |
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def __init__(self): |
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Session.__init__(self) |
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self._system_host_keys = paramiko.HostKeys() |
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self._host_keys = paramiko.HostKeys() |
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self._host_keys_filename = None |
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self._transport = None |
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self._connected = False |
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self._channel = None |
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self._buffer = StringIO() # for incoming data |
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# parsing-related, see _parse() |
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self._parsing_state = 0 |
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self._parsing_pos = 0 |
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|
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def _parse(self): |
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'''Messages ae delimited by MSG_DELIM. The buffer could have grown by a |
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maximum of BUF_SIZE bytes everytime this method is called. Retains state |
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across method calls and if a byte has been read it will not be considered |
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again. |
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''' |
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delim = MSG_DELIM |
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n = len(delim) - 1 |
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expect = self._parsing_state |
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buf = self._buffer |
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buf.seek(self._parsing_pos) |
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while True: |
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x = buf.read(1) |
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if not x: # done reading |
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break |
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elif x == delim[expect]: # what we expected |
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expect += 1 # expect the next delim char |
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else: |
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continue |
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# loop till last delim char expected, break if other char encountered |
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for i in range(expect, n): |
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x = buf.read(1) |
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if not x: # done reading |
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break |
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if x == delim[expect]: # what we expected |
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expect += 1 # expect the next delim char |
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else: |
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expect = 0 # reset |
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break |
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else: # if we didn't break out of the loop, full delim was parsed |
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msg_till = buf.tell() - n |
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buf.seek(0) |
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msg = buf.read(msg_till) |
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self.dispatch('received', msg) |
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buf.seek(n+1, os.SEEK_CUR) |
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rest = buf.read() |
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buf = StringIO() |
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buf.write(rest) |
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buf.seek(0) |
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state = 0 |
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self._buffer = buf |
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self._parsing_state = expect |
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self._parsing_pos = self._buffer.tell() |
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|
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def load_system_host_keys(self, filename=None): |
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92 |
if filename is None: |
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# try the user's .ssh key file, and mask exceptions |
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filename = os.path.expanduser('~/.ssh/known_hosts') |
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try: |
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self._system_host_keys.load(filename) |
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except IOError: |
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pass |
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return |
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self._system_host_keys.load(filename) |
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101 |
|
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def load_host_keys(self, filename): |
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self._host_keys_filename = filename |
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self._host_keys.load(filename) |
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105 |
|
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def add_host_key(self, key): |
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self._host_keys.add(key) |
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108 |
|
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def save_host_keys(self, filename): |
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f = open(filename, 'w') |
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111 |
for hostname, keys in self._host_keys.iteritems(): |
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112 |
for keytype, key in keys.iteritems(): |
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f.write('%s %s %s\n' % (hostname, keytype, key.get_base64())) |
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f.close() |
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115 |
|
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def close(self): |
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117 |
if self._transport.is_active(): |
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self._transport.close() |
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119 |
self._connected = False |
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120 |
|
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121 |
def connect(self, hostname, port=830, timeout=None, |
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unknown_host_cb=None, username=None, password=None, |
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key_filename=None, allow_agent=True, look_for_keys=True): |
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124 |
|
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assert(username is not None) |
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126 |
|
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for (family, socktype, proto, canonname, sockaddr) in \ |
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128 |
socket.getaddrinfo(hostname, port): |
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129 |
if socktype==socket.SOCK_STREAM: |
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130 |
af = family |
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131 |
addr = sockaddr |
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132 |
break |
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133 |
else: |
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134 |
raise SSHError('No suitable address family for %s' % hostname) |
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135 |
sock = socket.socket(af, socket.SOCK_STREAM) |
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136 |
sock.settimeout(timeout) |
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137 |
sock.connect(addr) |
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138 |
t = self._transport = paramiko.Transport(sock) |
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139 |
t.set_log_channel(logger.name) |
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140 |
|
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141 |
try: |
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142 |
t.start_client() |
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143 |
except paramiko.SSHException: |
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144 |
raise SSHError('Negotiation failed') |
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145 |
|
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146 |
# host key verification |
|
147 |
server_key = t.get_remote_server_key() |
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148 |
known_host = self._host_keys.check(hostname, server_key) or \ |
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149 |
self._system_host_keys.check(hostname, server_key) |
|
150 |
|
|
151 |
if unknown_host_cb is None: |
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152 |
unknown_host_cb = lambda *args: False |
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153 |
if not known_host and not unknown_host_cb(hostname, server_key): |
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154 |
raise SSHUnknownHostError(hostname, server_key) |
|
155 |
|
|
156 |
if key_filename is None: |
|
157 |
key_filenames = [] |
|
158 |
elif isinstance(key_filename, basestring): |
|
159 |
key_filenames = [ key_filename ] |
|
160 |
else: |
|
161 |
key_filenames = key_filename |
|
162 |
|
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163 |
self._auth(username, password, key_filenames, allow_agent, look_for_keys) |
|
164 |
|
|
165 |
self._connected = True # there was no error authenticating |
|
166 |
|
|
167 |
c = self._channel = self._transport.open_session() |
|
168 |
c.invoke_subsystem('netconf') |
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169 |
c.set_name('netconf') |
|
170 |
|
|
171 |
self._post_connect() |
|
172 |
|
|
173 |
# on the lines of paramiko.SSHClient._auth() |
|
174 |
def _auth(self, username, password, key_filenames, allow_agent, |
|
175 |
look_for_keys): |
|
176 |
saved_exception = None |
|
177 |
|
|
178 |
for key_filename in key_filenames: |
|
179 |
for cls in (paramiko.RSAKey, paramiko.DSSKey): |
|
180 |
try: |
|
181 |
key = cls.from_private_key_file(key_filename, password) |
|
182 |
logger.debug('Trying key %s from %s' % |
|
183 |
(hexlify(key.get_fingerprint()), key_filename)) |
|
184 |
self._transport.auth_publickey(username, key) |
|
185 |
return |
|
186 |
except Exception as e: |
|
187 |
saved_exception = e |
|
188 |
logger.debug(e) |
|
189 |
|
|
190 |
if allow_agent: |
|
191 |
for key in paramiko.Agent().get_keys(): |
|
192 |
try: |
|
193 |
logger.debug('Trying SSH agent key %s' % |
|
194 |
hexlify(key.get_fingerprint())) |
|
195 |
self._transport.auth_publickey(username, key) |
|
196 |
return |
|
197 |
except Exception as e: |
|
198 |
saved_exception = e |
|
199 |
logger.debug(e) |
|
200 |
|
|
201 |
keyfiles = [] |
|
202 |
if look_for_keys: |
|
203 |
rsa_key = os.path.expanduser('~/.ssh/id_rsa') |
|
204 |
dsa_key = os.path.expanduser('~/.ssh/id_dsa') |
|
205 |
if os.path.isfile(rsa_key): |
|
206 |
keyfiles.append((paramiko.RSAKey, rsa_key)) |
|
207 |
if os.path.isfile(dsa_key): |
|
208 |
keyfiles.append((paramiko.DSSKey, dsa_key)) |
|
209 |
# look in ~/ssh/ for windows users: |
|
210 |
rsa_key = os.path.expanduser('~/ssh/id_rsa') |
|
211 |
dsa_key = os.path.expanduser('~/ssh/id_dsa') |
|
212 |
if os.path.isfile(rsa_key): |
|
213 |
keyfiles.append((paramiko.RSAKey, rsa_key)) |
|
214 |
if os.path.isfile(dsa_key): |
|
215 |
keyfiles.append((paramiko.DSSKey, dsa_key)) |
|
216 |
|
|
217 |
for cls, filename in keyfiles: |
|
218 |
try: |
|
219 |
key = cls.from_private_key_file(filename, password) |
|
220 |
logger.debug('Trying discovered key %s in %s' % |
|
221 |
(hexlify(key.get_fingerprint()), filename)) |
|
222 |
self._transport.auth_publickey(username, key) |
|
223 |
return |
|
224 |
except Exception as e: |
|
225 |
saved_exception = e |
|
226 |
logger.debug(e) |
|
227 |
|
|
228 |
if password is not None: |
|
229 |
try: |
|
230 |
self._transport.auth_password(username, password) |
|
231 |
return |
|
232 |
except Exception as e: |
|
233 |
saved_exception = e |
|
234 |
logger.debug(e) |
|
235 |
|
|
236 |
if saved_exception is not None: |
|
237 |
raise AuthenticationError(repr(saved_exception)) |
|
238 |
|
|
239 |
raise AuthenticationError('No authentication methods available') |
|
240 |
|
|
241 |
def run(self): |
|
242 |
chan = self._channel |
|
243 |
chan.setblocking(0) |
|
244 |
q = self._q |
|
245 |
try: |
|
246 |
while True: |
|
247 |
# select on a paramiko ssh channel object does not ever return |
|
248 |
# it in the writable list, so it channel's don't exactly emulate |
|
249 |
# the socket api |
|
250 |
r, w, e = select([chan], [], [], TICK) |
|
251 |
# will wakeup evey TICK seconds to check if something |
|
252 |
# to send, more if something to read (due to select returning |
|
253 |
# chan in readable list) |
|
254 |
if r: |
|
255 |
data = chan.recv(BUF_SIZE) |
|
256 |
if data: |
|
257 |
self._buffer.write(data) |
|
258 |
self._parse() |
|
259 |
else: |
|
260 |
raise SSHSessionClosedError(self._buffer.getvalue()) |
|
261 |
if not q.empty() and chan.send_ready(): |
|
262 |
data = q.get() + MSG_DELIM |
|
263 |
while data: |
|
264 |
n = chan.send(data) |
|
265 |
if n <= 0: |
|
266 |
raise SSHSessionClosedError(self._buffer.getvalue(), data) |
|
267 |
data = data[n:] |
|
268 |
except Exception as e: |
|
269 |
self.close() |
|
270 |
logger.debug('*** broke out of main loop ***') |
|
271 |
self.dispatch('error', e) |
|
272 |
|
|
273 |
@property |
|
274 |
def transport(self): |
|
275 |
'''Get underlying paramiko.transport object; this is provided so methods |
|
276 |
like transport.set_keepalive can be called. |
|
277 |
''' |
|
278 |
return self._transport |
Also available in: Unified diff