#!/usr/bin/env python
# (c) 2017, Ansible, Inc. <support@ansible.com>
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
########################################################
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
__requires__ = ['ansible']
try:
import pkg_resources
except Exception:
pass
import fcntl
import os
import shlex
import signal
import socket
import sys
import time
import traceback
import datetime
import errno
from ansible import constants as C
from ansible.module_utils._text import to_bytes, to_native, to_text
from ansible.module_utils.six import PY3
from ansible.module_utils.six.moves import cPickle
from ansible.module_utils.connection import send_data, recv_data
from ansible.playbook.play_context import PlayContext
from ansible.plugins.loader import connection_loader
from ansible.utils.path import unfrackpath, makedirs_safe
from ansible.errors import AnsibleConnectionFailure
from ansible.utils.display import Display
def do_fork():
'''
Does the required double fork for a daemon process. Based on
http://code.activestate.com/recipes/66012-fork-a-daemon-process-on-unix/
'''
try:
pid = os.fork()
if pid > 0:
return pid
# This is done as a 'good practice' for daemons, but we need to keep the cwd
# leaving it here as a note that we KNOW its good practice but are not doing it on purpose.
# os.chdir("/")
os.setsid()
os.umask(0)
try:
pid = os.fork()
if pid > 0:
sys.exit(0)
if C.DEFAULT_LOG_PATH != '':
out_file = open(C.DEFAULT_LOG_PATH, 'ab+')
err_file = open(C.DEFAULT_LOG_PATH, 'ab+', 0)
else:
out_file = open('/dev/null', 'ab+')
err_file = open('/dev/null', 'ab+', 0)
os.dup2(out_file.fileno(), sys.stdout.fileno())
os.dup2(err_file.fileno(), sys.stderr.fileno())
os.close(sys.stdin.fileno())
return pid
except OSError as e:
sys.exit(1)
except OSError as e:
sys.exit(1)
class Server():
def __init__(self, socket_path, play_context):
self.socket_path = socket_path
self.play_context = play_context
display.display(
'creating new control socket for host %s:%s as user %s' %
(play_context.remote_addr, play_context.port, play_context.remote_user),
log_only=True
)
display.display('control socket path is %s' % socket_path, log_only=True)
display.display('current working directory is %s' % os.getcwd(), log_only=True)
self._start_time = datetime.datetime.now()
display.display("using connection plugin %s" % self.play_context.connection, log_only=True)
self.connection = connection_loader.get(play_context.connection, play_context, sys.stdin)
self.connection._connect()
if not self.connection.connected:
raise AnsibleConnectionFailure('unable to connect to remote host %s' % self._play_context.remote_addr)
connection_time = datetime.datetime.now() - self._start_time
display.display('connection established to %s in %s' % (play_context.remote_addr, connection_time), log_only=True)
self.socket = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
self.socket.bind(self.socket_path)
self.socket.listen(1)
display.display('local socket is set to listening', log_only=True)
def run(self):
try:
while True:
signal.signal(signal.SIGALRM, self.connect_timeout)
signal.signal(signal.SIGTERM, self.handler)
signal.alarm(C.PERSISTENT_CONNECT_TIMEOUT)
(s, addr) = self.socket.accept()
display.display('incoming request accepted on persistent socket', log_only=True)
signal.alarm(0)
while True:
data = recv_data(s)
if not data:
break
signal.signal(signal.SIGALRM, self.command_timeout)
signal.alarm(self.play_context.timeout)
op = to_text(data.split(b':')[0])
display.display('socket operation is %s' % op, log_only=True)
method = getattr(self, 'do_%s' % op, None)
rc = 255
stdout = stderr = ''
if not method:
stderr = 'Invalid action specified'
else:
rc, stdout, stderr = method(data)
signal.alarm(0)
display.display('socket operation completed with rc %s' % rc, log_only=True)
send_data(s, to_bytes(rc))
send_data(s, to_bytes(stdout))
send_data(s, to_bytes(stderr))
s.close()
except Exception as e:
# socket.accept() will raise EINTR if the socket.close() is called
if e.errno != errno.EINTR:
display.display(traceback.format_exc(), log_only=True)
finally:
# when done, close the connection properly and cleanup
# the socket file so it can be recreated
self.shutdown()
end_time = datetime.datetime.now()
delta = end_time - self._start_time
display.display('shutdown local socket, connection was active for %s secs' % delta, log_only=True)
def connect_timeout(self, signum, frame):
display.display('persistent connection idle timeout triggered, timeout value is %s secs' % C.PERSISTENT_CONNECT_TIMEOUT, log_only=True)
self.shutdown()
def command_timeout(self, signum, frame):
display.display('command timeout triggered, timeout value is %s secs' % self.play_context.timeout, log_only=True)
self.shutdown()
def handler(self, signum, frame):
display.display('signal handler called with signal %s' % signum, log_only=True)
self.shutdown()
def shutdown(self):
display.display('shutdown persistent connection requested', log_only=True)
if not os.path.exists(self.socket_path):
display.display('persistent connection is not active', log_only=True)
return
try:
if self.socket:
display.display('closing local listener', log_only=True)
self.socket.close()
if self.connection:
display.display('closing the connection', log_only=True)
self.connection.close()
except:
pass
finally:
if os.path.exists(self.socket_path):
display.display('removing the local control socket', log_only=True)
os.remove(self.socket_path)
display.display('shutdown complete', log_only=True)
def do_EXEC(self, data):
cmd = data.split(b'EXEC: ')[1]
return self.connection.exec_command(cmd)
def do_PUT(self, data):
(op, src, dst) = shlex.split(to_native(data))
return self.connection.fetch_file(src, dst)
def do_FETCH(self, data):
(op, src, dst) = shlex.split(to_native(data))
return self.connection.put_file(src, dst)
def do_CONTEXT(self, data):
pc_data = data.split(b'CONTEXT: ', 1)[1]
if PY3:
pc_data = cPickle.loads(pc_data, encoding='bytes')
else:
pc_data = cPickle.loads(pc_data)
pc = PlayContext()
pc.deserialize(pc_data)
try:
self.connection.update_play_context(pc)
except AttributeError:
pass
return (0, 'ok', '')
def do_RUN(self, data):
timeout = self.play_context.timeout
while bool(timeout):
if os.path.exists(self.socket_path):
break
time.sleep(1)
timeout -= 1
socket_bytes = to_bytes(self.socket_path, errors='surrogate_or_strict')
return 0, b'\n#SOCKET_PATH#: %s\n' % socket_bytes, ''
def communicate(sock, data):
send_data(sock, data)
rc = int(recv_data(sock), 10)
stdout = recv_data(sock)
stderr = recv_data(sock)
return (rc, stdout, stderr)
def main():
# Need stdin as a byte stream
if PY3:
stdin = sys.stdin.buffer
else:
stdin = sys.stdin
try:
# read the play context data via stdin, which means depickling it
# FIXME: as noted above, we will probably need to deserialize the
# connection loader here as well at some point, otherwise this
# won't find role- or playbook-based connection plugins
cur_line = stdin.readline()
init_data = b''
while cur_line.strip() != b'#END_INIT#':
if cur_line == b'':
raise Exception("EOF found before init data was complete")
init_data += cur_line
cur_line = stdin.readline()
if PY3:
pc_data = cPickle.loads(init_data, encoding='bytes')
else:
pc_data = cPickle.loads(init_data)
pc = PlayContext()
pc.deserialize(pc_data)
except Exception as e:
# FIXME: better error message/handling/logging
sys.stderr.write(traceback.format_exc())
sys.exit("FAIL: %s" % e)
ssh = connection_loader.get('ssh', class_only=True)
cp = ssh._create_control_path(pc.remote_addr, pc.port, pc.remote_user, pc.connection)
# 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)
lock_path = unfrackpath("%s/.ansible_pc_lock" % tmp_path)
socket_path = unfrackpath(cp % dict(directory=tmp_path))
# if the socket file doesn't exist, spin up the daemon process
lock_fd = os.open(lock_path, os.O_RDWR | os.O_CREAT, 0o600)
fcntl.lockf(lock_fd, fcntl.LOCK_EX)
if not os.path.exists(socket_path):
pid = do_fork()
if pid == 0:
rc = 0
try:
server = Server(socket_path, pc)
except AnsibleConnectionFailure as exc:
display.display('connecting to host %s returned an error' % pc.remote_addr, log_only=True)
display.display(str(exc), log_only=True)
rc = 1
except Exception as exc:
display.display('failed to create control socket for host %s' % pc.remote_addr, log_only=True)
display.display(traceback.format_exc(), log_only=True)
rc = 1
fcntl.lockf(lock_fd, fcntl.LOCK_UN)
os.close(lock_fd)
if rc == 0:
server.run()
sys.exit(rc)
else:
display.display('re-using existing socket for %s@%s:%s' % (pc.remote_user, pc.remote_addr, pc.port), log_only=True)
fcntl.lockf(lock_fd, fcntl.LOCK_UN)
os.close(lock_fd)
timeout = pc.timeout
while bool(timeout):
if os.path.exists(socket_path):
display.vvvv('connected to local socket in %s' % (pc.timeout - timeout), pc.remote_addr)
break
time.sleep(1)
timeout -= 1
else:
raise AnsibleConnectionFailure('timeout waiting for local socket', pc.remote_addr)
# now connect to the daemon process
# FIXME: if the socket file existed but the daemonized process was killed,
# the connection will timeout here. Need to make this more resilient.
while True:
data = stdin.readline()
if data == b'':
break
if data.strip() == b'':
continue
sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
connect_retry_timeout = C.PERSISTENT_CONNECT_RETRY_TIMEOUT
while bool(connect_retry_timeout):
try:
sock.connect(socket_path)
break
except socket.error:
time.sleep(1)
connect_retry_timeout -= 1
else:
display.display('connect retry timeout expired, unable to connect to control socket', pc.remote_addr, pc.remote_user, log_only=True)
display.display('persistent_connect_retry_timeout is %s secs' % (C.PERSISTENT_CONNECT_RETRY_TIMEOUT), pc.remote_addr, pc.remote_user, log_only=True)
sys.stderr.write('failed to connect to control socket')
sys.exit(255)
# send the play_context back into the connection so the connection
# can handle any privilege escalation activities
pc_data = b'CONTEXT: %s' % init_data
communicate(sock, pc_data)
rc, stdout, stderr = communicate(sock, data.strip())
sys.stdout.write(to_native(stdout))
sys.stderr.write(to_native(stderr))
sock.close()
break
sys.exit(rc)
if __name__ == '__main__':
display = Display()
main()