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#!/usr/bin/python2
# Copyright: (c) 2017, Ansible Project
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
__requires__ = ['ansible']
try:
import pkg_resources
except Exception:
pass
import fcntl
import hashlib
import os
import signal
import socket
import sys
import time
import traceback
import errno
import json
from contextlib import contextmanager
from ansible import constants as C
from ansible.module_utils._text import to_bytes, to_text
from ansible.module_utils.six import PY3
from ansible.module_utils.six.moves import cPickle, StringIO
from ansible.module_utils.connection import Connection, ConnectionError, send_data, recv_data
from ansible.module_utils.service import fork_process
from ansible.playbook.play_context import PlayContext
from ansible.plugins.loader import connection_loader
from ansible.utils.path import unfrackpath, makedirs_safe
from ansible.utils.display import Display
from ansible.utils.jsonrpc import JsonRpcServer
def read_stream(byte_stream):
size = int(byte_stream.readline().strip())
data = byte_stream.read(size)
if len(data) < size:
raise Exception("EOF found before data was complete")
data_hash = to_text(byte_stream.readline().strip())
if data_hash != hashlib.sha1(data).hexdigest():
raise Exception("Read {0} bytes, but data did not match checksum".format(size))
# restore escaped loose \r characters
data = data.replace(br'\r', b'\r')
return data
@contextmanager
def file_lock(lock_path):
"""
Uses contextmanager to create and release a file lock based on the
given path. This allows us to create locks using `with file_lock()`
to prevent deadlocks related to failure to unlock properly.
"""
lock_fd = os.open(lock_path, os.O_RDWR | os.O_CREAT, 0o600)
fcntl.lockf(lock_fd, fcntl.LOCK_EX)
yield
fcntl.lockf(lock_fd, fcntl.LOCK_UN)
os.close(lock_fd)
class ConnectionProcess(object):
'''
The connection process wraps around a Connection object that manages
the connection to a remote device that persists over the playbook
'''
def __init__(self, fd, play_context, socket_path, original_path, ansible_playbook_pid=None):
self.play_context = play_context
self.socket_path = socket_path
self.original_path = original_path
self.fd = fd
self.exception = None
self.srv = JsonRpcServer()
self.sock = None
self.connection = None
self._ansible_playbook_pid = ansible_playbook_pid
def start(self, variables):
try:
messages = list()
result = {}
messages.append('control socket path is %s' % self.socket_path)
# If this is a relative path (~ gets expanded later) then plug the
# key's path on to the directory we originally came from, so we can
# find it now that our cwd is /
if self.play_context.private_key_file and self.play_context.private_key_file[0] not in '~/':
self.play_context.private_key_file = os.path.join(self.original_path, self.play_context.private_key_file)
self.connection = connection_loader.get(self.play_context.connection, self.play_context, '/dev/null',
ansible_playbook_pid=self._ansible_playbook_pid)
self.connection.set_options(var_options=variables)
self.connection._connect()
self.connection._socket_path = self.socket_path
self.srv.register(self.connection)
messages.extend(sys.stdout.getvalue().splitlines())
messages.append('connection to remote device started successfully')
self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
self.sock.bind(self.socket_path)
self.sock.listen(1)
messages.append('local domain socket listeners started successfully')
except Exception as exc:
result['error'] = to_text(exc)
result['exception'] = traceback.format_exc()
finally:
result['messages'] = messages
self.fd.write(json.dumps(result))
self.fd.close()
def run(self):
try:
while self.connection.connected:
signal.signal(signal.SIGALRM, self.connect_timeout)
signal.signal(signal.SIGTERM, self.handler)
signal.alarm(self.connection.get_option('persistent_connect_timeout'))
self.exception = None
(s, addr) = self.sock.accept()
signal.alarm(0)
signal.signal(signal.SIGALRM, self.command_timeout)
while True:
data = recv_data(s)
if not data:
break
signal.alarm(self.connection.get_option('persistent_command_timeout'))
resp = self.srv.handle_request(data)
signal.alarm(0)
send_data(s, to_bytes(resp))
s.close()
except Exception as e:
# socket.accept() will raise EINTR if the socket.close() is called
if hasattr(e, 'errno'):
if e.errno != errno.EINTR:
self.exception = traceback.format_exc()
else:
self.exception = traceback.format_exc()
finally:
# allow time for any exception msg send over socket to receive at other end before shutting down
time.sleep(0.1)
# when done, close the connection properly and cleanup the socket file so it can be recreated
self.shutdown()
def connect_timeout(self, signum, frame):
msg = 'persistent connection idle timeout triggered, timeout value is %s secs.\nSee the timeout setting options in the Network Debug and ' \
'Troubleshooting Guide.' % self.connection.get_option('persistent_connect_timeout')
display.display(msg, log_only=True)
raise Exception(msg)
def command_timeout(self, signum, frame):
msg = 'command timeout triggered, timeout value is %s secs.\nSee the timeout setting options in the Network Debug and Troubleshooting Guide.'\
% self.connection.get_option('persistent_command_timeout')
display.display(msg, log_only=True)
raise Exception(msg)
def handler(self, signum, frame):
msg = 'signal handler called with signal %s.' % signum
display.display(msg, log_only=True)
raise Exception(msg)
def shutdown(self):
""" Shuts down the local domain socket
"""
lock_path = unfrackpath("%s/.ansible_pc_lock_%s" % os.path.split(self.socket_path))
if os.path.exists(self.socket_path):
try:
if self.sock:
self.sock.close()
if self.connection:
self.connection.close()
except:
pass
finally:
if os.path.exists(self.socket_path):
os.remove(self.socket_path)
setattr(self.connection, '_socket_path', None)
setattr(self.connection, '_connected', False)
if os.path.exists(lock_path):
os.remove(lock_path)
display.display('shutdown complete', log_only=True)
def main():
""" Called to initiate the connect to the remote device
"""
rc = 0
result = {}
messages = list()
socket_path = None
# Need stdin as a byte stream
if PY3:
stdin = sys.stdin.buffer
else:
stdin = sys.stdin
# Note: update the below log capture code after Display.display() is refactored.
saved_stdout = sys.stdout
sys.stdout = StringIO()
try:
# read the play context data via stdin, which means depickling it
vars_data = read_stream(stdin)
init_data = read_stream(stdin)
if PY3:
pc_data = cPickle.loads(init_data, encoding='bytes')
variables = cPickle.loads(vars_data, encoding='bytes')
else:
pc_data = cPickle.loads(init_data)
variables = cPickle.loads(vars_data)
play_context = PlayContext()
play_context.deserialize(pc_data)
display.verbosity = play_context.verbosity
except Exception as e:
rc = 1
result.update({
'error': to_text(e),
'exception': traceback.format_exc()
})
if rc == 0:
ssh = connection_loader.get('ssh', class_only=True)
ansible_playbook_pid = sys.argv[1]
cp = ssh._create_control_path(play_context.remote_addr, play_context.port, play_context.remote_user, play_context.connection, ansible_playbook_pid)
# create the persistent connection dir if need be and create the paths
# which we will be using later
tmp_path = unfrackpath(C.PERSISTENT_CONTROL_PATH_DIR)
makedirs_safe(tmp_path)
socket_path = unfrackpath(cp % dict(directory=tmp_path))
lock_path = unfrackpath("%s/.ansible_pc_lock_%s" % os.path.split(socket_path))
with file_lock(lock_path):
if not os.path.exists(socket_path):
messages.append('local domain socket does not exist, starting it')
original_path = os.getcwd()
r, w = os.pipe()
pid = fork_process()
if pid == 0:
try:
os.close(r)
wfd = os.fdopen(w, 'w')
process = ConnectionProcess(wfd, play_context, socket_path, original_path, ansible_playbook_pid)
process.start(variables)
except Exception:
messages.append(traceback.format_exc())
rc = 1
if rc == 0:
process.run()
else:
process.shutdown()
sys.exit(rc)
else:
os.close(w)
rfd = os.fdopen(r, 'r')
data = json.loads(rfd.read())
messages.extend(data.pop('messages'))
result.update(data)
else:
messages.append('found existing local domain socket, using it!')
conn = Connection(socket_path)
conn.set_options(var_options=variables)
pc_data = to_text(init_data)
try:
messages.extend(conn.update_play_context(pc_data))
except Exception as exc:
# Only network_cli has update_play context, so missing this is
# not fatal e.g. netconf
if isinstance(exc, ConnectionError) and getattr(exc, 'code', None) == -32601:
pass
else:
result.update({
'error': to_text(exc),
'exception': traceback.format_exc()
})
messages.append(sys.stdout.getvalue())
result.update({
'messages': messages,
'socket_path': socket_path
})
sys.stdout = saved_stdout
if 'exception' in result:
rc = 1
sys.stderr.write(json.dumps(result))
else:
rc = 0
sys.stdout.write(json.dumps(result))
sys.exit(rc)
if __name__ == '__main__':
display = Display()
main()