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#!/usr/bin/env python2.7
##
## Copyright (c) 2019 Intel Corporation
##
## Licensed under the Apache License, Version 2.0 (the "License");
## you may not use this file except in compliance with the License.
## You may obtain a copy of the License at
##
## http://www.apache.org/licenses/LICENSE-2.0
##
## Unless required by applicable law or agreed to in writing, software
## distributed under the License is distributed on an "AS IS" BASIS,
## WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
## See the License for the specific language governing permissions and
## limitations under the License.
##
import paramiko
import logging
class SSHClient:
"""Wrapper class for paramiko module to connect via SSH
"""
_log = None
_ip = None
_user = None
_rsa_private_key = None
_timeout = None
_ssh = None
_connected = False
_output = None
_error = None
def __init__(self, ip=None, user=None, rsa_private_key=None, timeout=15, logger_name=None):
self._ip = ip
self._user = user
self._rsa_private_key = rsa_private_key
self._timeout = timeout
if (logger_name is not None):
self._log = logging.getLogger(logger_name)
self._connected = False
def set_credentials(self, ip, user, rsa_private_key):
self._ip = ip
self._user = user
self._rsa_private_key = rsa_private_key
def connect(self):
if self._connected:
if (self._log is not None):
self._log.debug("Already connected!")
return
if ((self._ip is None) or (self._user is None) or
(self._rsa_private_key is None)):
if (self._log is not None):
self._log.error("Wrong parameter! IP %s, user %s, RSA private key %s"
% (self._ip, self._user, self._rsa_private_key))
self._connected = False
return
self._ssh = paramiko.SSHClient()
self._ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
private_key = paramiko.RSAKey.from_private_key_file(self._rsa_private_key)
try:
self._ssh.connect(hostname = self._ip, username = self._user, pkey = private_key)
except Exception as e:
if (self._log is not None):
self._log.error("Failed to connect to the host! IP %s, user %s, RSA private key %s\n%s"
% (self._ip, self._user, self._rsa_private_key, e))
self._connected = False
self._ssh.close()
return
self._connected = True
def disconnect(self):
if self._connected:
self._connected = False
self._ssh.close()
def run_cmd(self, cmd):
self.connect()
if self._connected is not True:
return -1
try:
ret = 0
_stdin, stdout, stderr = self._ssh.exec_command(cmd, timeout = self._timeout)
self._output = stdout.read()
self._error = stderr.read()
except Exception as e:
if (self._log is not None):
self._log.error("Failed to execute command! IP %s, cmd %s\n%s"
% (self._ip, cmd, e))
ret = -1
self.disconnect()
return ret
def get_output(self):
return self._output
def get_error(self):
return self._error
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