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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Copyright (c) 2017 Cisco and/or its affiliates.
#
# 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 os
import stat
import logging
import subprocess
import shlex
from netmodel.model.type import String, Integer
from netmodel.util.misc import is_local_host
from netmodel.util.socket import check_port
from vicn.core.attribute import Attribute
from vicn.core.commands import Command, ReturnValue
from vicn.core.exception import ResourceNotFound, VICNException
from vicn.core.task import Task, task
from vicn.resource.linux.keypair import Keypair
from vicn.resource.node import Node, DEFAULT_USERNAME
from vicn.resource.node import DEFAULT_SSH_PUBLIC_KEY
from vicn.resource.node import DEFAULT_SSH_PRIVATE_KEY
log = logging.getLogger(__name__)
CMD_SSH_COPY_ID = 'ssh-copy-id {ssh_options} -i {public_key} -p {port} ' \
'{user}@{host}'
CMD_SSH = 'ssh {ssh_options} -i {private_key} -p {port} ' \
'{user}@{host} {command}'
CMD_SSH_NF = 'ssh -n -f {ssh_options} -i {private_key} -p {port} ' \
'{user}@{host} {command}'
FN_KEY = os.path.expanduser(os.path.join(
'~', '.vicn', 'ssh_client_cert', 'ssh_client_key'))
class Physical(Node):
"""
Resource: Physical
Physical node
"""
hostname = Attribute(String, description = 'Hostname or IP address',
mandatory = True)
ssh_port = Attribute(Integer, description = 'SSH port number',
default = 22)
#--------------------------------------------------------------------------
# Constructor and Accessors
#--------------------------------------------------------------------------
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.node_with_kernel = self
#--------------------------------------------------------------------------
# Resource lifecycle
#--------------------------------------------------------------------------
def __subresources__(self):
"""
Require a SSH keypair to be present for authentication on nodes
"""
return Keypair(node = None, key = FN_KEY)
def __initialize__(self):
"""
Initialization require the ssh port to be open on the node, and the ssh
public key to be copied on the remote node.
"""
if not check_port(self.hostname, self.ssh_port):
raise VICNException
tasks = list()
modes = (True, False) if DEFAULT_USERNAME != 'root' else (True,)
for as_root in modes:
tasks.append(self._setup_ssh_key(as_root))
return Task.__concurrent__(*tasks)
__delete__ = None
#--------------------------------------------------------------------------
# Internal methods
#--------------------------------------------------------------------------
@task
def _setup_ssh_key(self, as_root):
os.chmod(DEFAULT_SSH_PUBLIC_KEY, stat.S_IRUSR | stat.S_IWUSR)
os.chmod(DEFAULT_SSH_PRIVATE_KEY, stat.S_IRUSR | stat.S_IWUSR)
cmd_params = {
'public_key' : DEFAULT_SSH_PUBLIC_KEY,
'ssh_options' : '',
'port' : self.ssh_port,
'user' : 'root' if as_root else DEFAULT_USERNAME,
'host' : self.hostname,
}
c = Command(CMD_SSH_COPY_ID, parameters = cmd_params)
return self._do_execute_process(c.full_commandline, output=False)
#--------------------------------------------------------------------------
# Public API
#--------------------------------------------------------------------------
def _do_execute_process(self, command, output = False):
p = subprocess.Popen(shlex.split(command), stdout=subprocess.PIPE)
if output:
out, err = p.communicate()
return ReturnValue(p.returncode, stdout=out, stderr=err)
p.wait()
return ReturnValue(p.returncode)
def _do_execute_ssh(self, command, output=False, as_root=False,
ssh_options=None):
if not ssh_options:
ssh_options = dict()
cmd_params = {
'private_key' : DEFAULT_SSH_PRIVATE_KEY,
'ssh_options' : ' '.join(['-o {}={}'.format(k, v)
for k, v in ssh_options.items()]),
'port' : self.ssh_port,
'user' : 'root' if as_root else DEFAULT_USERNAME,
'host' : self.hostname,
'command' : shlex.quote(command),
}
if (command[-1] != '&'):
c = Command(CMD_SSH, parameters = cmd_params)
else:
c = Command(CMD_SSH_NF, parameters = cmd_params)
return self._do_execute_process(c.full_commandline_nobashize, output)
def execute(self, command, output=False, as_root=False):
if is_local_host(self.hostname):
rv = self._do_execute_process(command, output = output)
else:
rv = self._do_execute_ssh(command, output = output,
as_root = as_root)
return rv
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