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390 lines
13 KiB
Python
390 lines
13 KiB
Python
#!/usr/bin/env python
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# (c) 2017, Ansible, Inc. <support@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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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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__requires__ = ['ansible']
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try:
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import pkg_resources
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except Exception:
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pass
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import fcntl
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import os
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import shlex
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import signal
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import socket
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import sys
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import time
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import traceback
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import datetime
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import errno
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from ansible import constants as C
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from ansible.module_utils._text import to_bytes, to_native, to_text
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from ansible.module_utils.six import PY3
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from ansible.module_utils.six.moves import cPickle
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from ansible.module_utils.connection import send_data, recv_data
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from ansible.playbook.play_context import PlayContext
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from ansible.plugins.loader import connection_loader
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from ansible.utils.path import unfrackpath, makedirs_safe
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from ansible.errors import AnsibleConnectionFailure
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from ansible.utils.display import Display
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def do_fork():
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'''
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Does the required double fork for a daemon process. Based on
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http://code.activestate.com/recipes/66012-fork-a-daemon-process-on-unix/
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'''
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try:
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pid = os.fork()
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if pid > 0:
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return pid
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# This is done as a 'good practice' for daemons, but we need to keep the cwd
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# leaving it here as a note that we KNOW its good practice but are not doing it on purpose.
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# os.chdir("/")
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os.setsid()
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os.umask(0)
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try:
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pid = os.fork()
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if pid > 0:
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sys.exit(0)
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if C.DEFAULT_LOG_PATH != '':
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out_file = open(C.DEFAULT_LOG_PATH, 'ab+')
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err_file = open(C.DEFAULT_LOG_PATH, 'ab+', 0)
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else:
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out_file = open('/dev/null', 'ab+')
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err_file = open('/dev/null', 'ab+', 0)
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os.dup2(out_file.fileno(), sys.stdout.fileno())
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os.dup2(err_file.fileno(), sys.stderr.fileno())
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os.close(sys.stdin.fileno())
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return pid
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except OSError as e:
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sys.exit(1)
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except OSError as e:
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sys.exit(1)
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class Server():
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def __init__(self, socket_path, play_context):
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self.socket_path = socket_path
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self.play_context = play_context
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display.display(
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'creating new control socket for host %s:%s as user %s' %
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(play_context.remote_addr, play_context.port, play_context.remote_user),
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log_only=True
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)
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display.display('control socket path is %s' % socket_path, log_only=True)
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display.display('current working directory is %s' % os.getcwd(), log_only=True)
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self._start_time = datetime.datetime.now()
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display.display("using connection plugin %s" % self.play_context.connection, log_only=True)
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self.connection = connection_loader.get(play_context.connection, play_context, sys.stdin)
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self.connection._connect()
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if not self.connection.connected:
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raise AnsibleConnectionFailure('unable to connect to remote host %s' % self._play_context.remote_addr)
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connection_time = datetime.datetime.now() - self._start_time
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display.display('connection established to %s in %s' % (play_context.remote_addr, connection_time), log_only=True)
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self.socket = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
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self.socket.bind(self.socket_path)
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self.socket.listen(1)
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display.display('local socket is set to listening', log_only=True)
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def run(self):
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try:
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while True:
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signal.signal(signal.SIGALRM, self.connect_timeout)
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signal.signal(signal.SIGTERM, self.handler)
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signal.alarm(C.PERSISTENT_CONNECT_TIMEOUT)
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(s, addr) = self.socket.accept()
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display.display('incoming request accepted on persistent socket', log_only=True)
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signal.alarm(0)
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while True:
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data = recv_data(s)
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if not data:
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break
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signal.signal(signal.SIGALRM, self.command_timeout)
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signal.alarm(self.play_context.timeout)
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op = to_text(data.split(b':')[0])
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display.display('socket operation is %s' % op, log_only=True)
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method = getattr(self, 'do_%s' % op, None)
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rc = 255
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stdout = stderr = ''
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if not method:
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stderr = 'Invalid action specified'
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else:
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rc, stdout, stderr = method(data)
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signal.alarm(0)
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display.display('socket operation completed with rc %s' % rc, log_only=True)
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send_data(s, to_bytes(rc))
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send_data(s, to_bytes(stdout))
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send_data(s, to_bytes(stderr))
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s.close()
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except Exception as e:
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# socket.accept() will raise EINTR if the socket.close() is called
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if e.errno != errno.EINTR:
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display.display(traceback.format_exc(), log_only=True)
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finally:
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# when done, close the connection properly and cleanup
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# the socket file so it can be recreated
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self.shutdown()
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end_time = datetime.datetime.now()
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delta = end_time - self._start_time
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display.display('shutdown local socket, connection was active for %s secs' % delta, log_only=True)
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def connect_timeout(self, signum, frame):
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display.display('persistent connection idle timeout triggered, timeout value is %s secs' % C.PERSISTENT_CONNECT_TIMEOUT, log_only=True)
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self.shutdown()
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def command_timeout(self, signum, frame):
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display.display('command timeout triggered, timeout value is %s secs' % self.play_context.timeout, log_only=True)
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self.shutdown()
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def handler(self, signum, frame):
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display.display('signal handler called with signal %s' % signum, log_only=True)
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self.shutdown()
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def shutdown(self):
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display.display('shutdown persistent connection requested', log_only=True)
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if not os.path.exists(self.socket_path):
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display.display('persistent connection is not active', log_only=True)
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return
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try:
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if self.socket:
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display.display('closing local listener', log_only=True)
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self.socket.close()
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if self.connection:
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display.display('closing the connection', log_only=True)
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self.connection.close()
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except:
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pass
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finally:
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if os.path.exists(self.socket_path):
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display.display('removing the local control socket', log_only=True)
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os.remove(self.socket_path)
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display.display('shutdown complete', log_only=True)
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def do_EXEC(self, data):
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cmd = data.split(b'EXEC: ')[1]
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display.display('Command executed: %s' % cmd, log_only=True)
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return self.connection.exec_command(cmd)
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def do_PUT(self, data):
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(op, src, dst) = shlex.split(to_native(data))
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return self.connection.fetch_file(src, dst)
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def do_FETCH(self, data):
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(op, src, dst) = shlex.split(to_native(data))
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return self.connection.put_file(src, dst)
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def do_CONTEXT(self, data):
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pc_data = data.split(b'CONTEXT: ', 1)[1]
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if PY3:
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pc_data = cPickle.loads(pc_data, encoding='bytes')
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else:
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pc_data = cPickle.loads(pc_data)
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pc = PlayContext()
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pc.deserialize(pc_data)
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try:
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self.connection.update_play_context(pc)
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except AttributeError:
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pass
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return (0, 'ok', '')
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def do_RUN(self, data):
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timeout = self.play_context.timeout
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while bool(timeout):
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if os.path.exists(self.socket_path):
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break
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time.sleep(1)
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timeout -= 1
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socket_bytes = to_bytes(self.socket_path, errors='surrogate_or_strict')
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return 0, b'\n#SOCKET_PATH#: %s\n' % socket_bytes, ''
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def communicate(sock, data):
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send_data(sock, data)
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rc = int(recv_data(sock), 10)
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stdout = recv_data(sock)
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stderr = recv_data(sock)
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return (rc, stdout, stderr)
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def main():
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# Need stdin as a byte stream
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if PY3:
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stdin = sys.stdin.buffer
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else:
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stdin = sys.stdin
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try:
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# read the play context data via stdin, which means depickling it
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# FIXME: as noted above, we will probably need to deserialize the
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# connection loader here as well at some point, otherwise this
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# won't find role- or playbook-based connection plugins
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cur_line = stdin.readline()
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init_data = b''
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while cur_line.strip() != b'#END_INIT#':
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if cur_line == b'':
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raise Exception("EOF found before init data was complete")
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init_data += cur_line
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cur_line = stdin.readline()
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if PY3:
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pc_data = cPickle.loads(init_data, encoding='bytes')
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else:
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pc_data = cPickle.loads(init_data)
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pc = PlayContext()
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pc.deserialize(pc_data)
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except Exception as e:
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# FIXME: better error message/handling/logging
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sys.stderr.write(traceback.format_exc())
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sys.exit("FAIL: %s" % e)
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ssh = connection_loader.get('ssh', class_only=True)
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cp = ssh._create_control_path(pc.remote_addr, pc.port, pc.remote_user, pc.connection)
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# create the persistent connection dir if need be and create the paths
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# which we will be using later
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tmp_path = unfrackpath(C.PERSISTENT_CONTROL_PATH_DIR)
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makedirs_safe(tmp_path)
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lock_path = unfrackpath("%s/.ansible_pc_lock" % tmp_path)
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socket_path = unfrackpath(cp % dict(directory=tmp_path))
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# if the socket file doesn't exist, spin up the daemon process
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lock_fd = os.open(lock_path, os.O_RDWR | os.O_CREAT, 0o600)
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fcntl.lockf(lock_fd, fcntl.LOCK_EX)
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if not os.path.exists(socket_path):
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pid = do_fork()
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if pid == 0:
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rc = 0
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try:
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server = Server(socket_path, pc)
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except AnsibleConnectionFailure as exc:
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display.display('connecting to host %s returned an error' % pc.remote_addr, log_only=True)
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display.display(str(exc), log_only=True)
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rc = 1
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except Exception as exc:
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display.display('failed to create control socket for host %s' % pc.remote_addr, log_only=True)
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display.display(traceback.format_exc(), log_only=True)
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rc = 1
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fcntl.lockf(lock_fd, fcntl.LOCK_UN)
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os.close(lock_fd)
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if rc == 0:
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server.run()
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sys.exit(rc)
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else:
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display.display('re-using existing socket for %s@%s:%s' % (pc.remote_user, pc.remote_addr, pc.port), log_only=True)
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fcntl.lockf(lock_fd, fcntl.LOCK_UN)
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os.close(lock_fd)
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timeout = pc.timeout
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while bool(timeout):
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if os.path.exists(socket_path):
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display.vvvv('connected to local socket in %s' % (pc.timeout - timeout), pc.remote_addr)
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break
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time.sleep(1)
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timeout -= 1
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else:
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raise AnsibleConnectionFailure('timeout waiting for local socket', pc.remote_addr)
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# now connect to the daemon process
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# FIXME: if the socket file existed but the daemonized process was killed,
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# the connection will timeout here. Need to make this more resilient.
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while True:
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data = stdin.readline()
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if data == b'':
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break
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if data.strip() == b'':
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continue
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sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
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connect_retry_timeout = C.PERSISTENT_CONNECT_RETRY_TIMEOUT
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while bool(connect_retry_timeout):
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try:
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sock.connect(socket_path)
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break
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except socket.error:
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time.sleep(1)
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connect_retry_timeout -= 1
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else:
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display.display('connect retry timeout expired, unable to connect to control socket', pc.remote_addr, pc.remote_user, log_only=True)
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display.display('persistent_connect_retry_timeout is %s secs' % (C.PERSISTENT_CONNECT_RETRY_TIMEOUT), pc.remote_addr, pc.remote_user, log_only=True)
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sys.stderr.write('failed to connect to control socket')
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sys.exit(255)
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# send the play_context back into the connection so the connection
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# can handle any privilege escalation activities
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pc_data = b'CONTEXT: %s' % init_data
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communicate(sock, pc_data)
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rc, stdout, stderr = communicate(sock, data.strip())
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sys.stdout.write(to_native(stdout))
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sys.stderr.write(to_native(stderr))
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sock.close()
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break
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sys.exit(rc)
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if __name__ == '__main__':
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display = Display()
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main()
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