mirror of
https://github.com/ansible-collections/community.general.git
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285 lines
8.7 KiB
Python
285 lines
8.7 KiB
Python
#
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# (c) 2015 Peter Sprygada, <psprygada@ansible.com>
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#
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# This file is part of Ansible
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#
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# Ansible is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Ansible is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
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#
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import os
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import re
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import socket
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import time
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import signal
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import json
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try:
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import paramiko
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from paramiko.ssh_exception import AuthenticationException
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HAS_PARAMIKO = True
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except ImportError:
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HAS_PARAMIKO = False
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from ansible.module_utils.basic import get_exception
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from ansible.module_utils.network import NetworkError
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from ansible.module_utils.six import BytesIO
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from ansible.module_utils._text import to_native
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from ansible.module_utils.network_common import to_list, ComplexDict
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from ansible.module_utils.netcli import Command
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ANSI_RE = [
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re.compile(r'(\x1b\[\?1h\x1b=)'),
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re.compile(r'\x08'),
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re.compile(r'\x1b[^m]*m')
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]
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class ShellError(Exception):
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def __init__(self, msg, command=None):
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super(ShellError, self).__init__(msg)
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self.command = command
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class Shell(object):
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def __init__(self, prompts_re=None, errors_re=None, kickstart=True, timeout=10):
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self.ssh = None
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self.shell = None
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self.kickstart = kickstart
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self._matched_prompt = None
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self.prompts = prompts_re or list()
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self.errors = errors_re or list()
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self._timeout = timeout
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self._history = list()
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signal.signal(signal.SIGALRM, self.alarm_handler)
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def open(self, host, port=22, username=None, password=None,
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key_filename=None, pkey=None, look_for_keys=None,
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allow_agent=False, key_policy="loose"):
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self.ssh = paramiko.SSHClient()
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if key_policy != "ignore":
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self.ssh.load_system_host_keys()
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try:
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self.ssh.load_host_keys(os.path.expanduser('~/.ssh/known_hosts'))
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except IOError:
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pass
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if key_policy == "strict":
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self.ssh.set_missing_host_key_policy(paramiko.RejectPolicy())
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else:
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self.ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
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# unless explicitly set, disable look for keys if a password is
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# present. this changes the default search order paramiko implements
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if not look_for_keys:
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look_for_keys = password is None
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try:
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self.ssh.connect(
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host, port=port, username=username, password=password,
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timeout=self._timeout, look_for_keys=look_for_keys, pkey=pkey,
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key_filename=key_filename, allow_agent=allow_agent,
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)
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self.shell = self.ssh.invoke_shell()
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self.shell.settimeout(self._timeout)
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except socket.gaierror:
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raise ShellError("unable to resolve host name")
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except AuthenticationException:
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raise ShellError('Unable to authenticate to remote device')
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except socket.timeout:
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raise ShellError("timeout trying to connect to remote device")
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except socket.error:
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exc = get_exception()
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if exc.errno == 60:
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raise ShellError('timeout trying to connect to host')
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raise
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if self.kickstart:
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self.shell.sendall("\n")
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self.receive()
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def strip(self, data):
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for regex in ANSI_RE:
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data = regex.sub('', data)
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return data
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def alarm_handler(self, signum, frame):
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self.shell.close()
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raise ShellError('timeout trying to send command: %s' % self._history[-1])
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def receive(self, cmd=None):
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recv = BytesIO()
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handled = False
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while True:
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data = self.shell.recv(200)
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recv.write(data)
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recv.seek(recv.tell() - len(data))
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window = self.strip(recv.read().decode('utf8'))
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if cmd:
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if cmd.get('prompt') and not handled:
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handled = self.handle_prompt(window, cmd)
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try:
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if self.find_prompt(window):
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resp = self.strip(recv.getvalue().decode('utf8'))
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if cmd:
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resp = self.sanitize(cmd, resp)
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return resp
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except ShellError:
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exc = get_exception()
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exc.command = cmd['command']
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raise
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def send(self, obj):
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try:
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self._history.append(str(obj['command']))
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cmd = '%s\r' % str(obj['command'])
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self.shell.sendall(cmd)
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if obj.get('sendonly'):
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return
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signal.alarm(self._timeout)
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out = self.receive(obj)
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signal.alarm(0)
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return (0, out, '')
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except ShellError:
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exc = get_exception()
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return (1, '', to_native(exc))
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def close(self):
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self.shell.close()
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def handle_prompt(self, resp, cmd):
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for prompt in to_list(cmd['prompt']):
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match = re.search(prompt, resp)
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if match:
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answer = '%s\r' % cmd['response']
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self.shell.sendall(answer)
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return True
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def sanitize(self, cmd, resp):
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cleaned = []
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for line in resp.splitlines():
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if line.lstrip().startswith(cmd['command']) or self.find_prompt(line):
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continue
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cleaned.append(line)
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return "\n".join(cleaned)
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def find_prompt(self, response):
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for regex in self.errors:
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if regex.search(response):
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raise ShellError('matched error in response: %s' % response)
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for regex in self.prompts:
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match = regex.search(response)
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if match:
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self._matched_prompt = match.group()
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return True
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class CliBase(object):
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"""Basic paramiko-based ssh transport any NetworkModule can use."""
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def __init__(self):
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if not HAS_PARAMIKO:
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raise NetworkError(
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msg='paramiko is required but does not appear to be installed. '
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'It can be installed using `pip install paramiko`'
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)
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self.shell = None
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self._connected = False
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def connect(self, params, kickstart=True):
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host = params['host']
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port = params.get('port') or 22
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username = params['username']
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password = params.get('password')
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key_file = params.get('ssh_keyfile')
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timeout = params.get('timeout') or 10
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try:
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self.shell = Shell(
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kickstart=kickstart,
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prompts_re=self.CLI_PROMPTS_RE,
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errors_re=self.CLI_ERRORS_RE,
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timeout=timeout
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)
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self.shell.open(host, port=port, username=username,
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password=password, key_filename=key_file)
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except ShellError:
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exc = get_exception()
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raise NetworkError(msg='failed to connect to %s:%s' % (host, port),
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exc=to_native(exc))
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self._connected = True
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def disconnect(self):
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self.shell.close()
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self._connected = False
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def to_command(self, obj):
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if isinstance(obj, Command):
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cmdobj = dict()
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cmdobj['command'] = obj.command
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cmdobj['response'] = obj.response
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cmdobj['prompt'] = [p.pattern for p in to_list(obj.prompt)]
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return cmdobj
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elif not isinstance(obj, dict):
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transform = ComplexDict(dict(
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command=dict(key=True),
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prompt=dict(),
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response=dict(),
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sendonly=dict(default=False)
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))
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return transform(obj)
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else:
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return obj
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def execute(self, commands):
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try:
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responses = list()
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for item in to_list(commands):
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item = self.to_command(item)
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rc, out, err = self.shell.send(item)
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if rc != 0:
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raise ShellError(err)
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responses.append(out)
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return responses
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except ShellError:
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exc = get_exception()
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raise NetworkError(to_native(exc))
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run_commands = lambda self, x: self.execute(to_list(x))
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exec_command = lambda self, x: self.shell.send(self.to_command(x))
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