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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# c1222/connection.py
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
# * Neither the name of the project nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
from __future__ import unicode_literals
import logging
import random
import select
import socket
from c1222.data import *
from c1222.errors import C1222IOError
if hasattr(logging, 'NullHandler'):
logging.getLogger('c1222').addHandler(logging.NullHandler())
def sock_read_ready(socket, timeout):
readys = select.select([socket.fileno()], [], [], timeout)
return len(readys[0]) == 1
class Connection(object):
def __init__(self, host, called_ap, calling_ap, enable_cache=True, bind_host=('', 1153)):
self.logger = logging.getLogger('c1222.connection')
self.loggerio = logging.getLogger('c1222.connection.io')
self.read_timeout = 3.0
self.server_sock_h = None
self.read_sock_h = None
self.bind_host = bind_host
self.start_listener()
self.host = host
self.sock_h = socket.create_connection(host)
self.logger.debug('successfully connected to: ' + host[0] + ':' + str(host[1]))
if not isinstance(called_ap, C1222CalledAPTitle):
called_ap = C1222CalledAPTitle(called_ap)
self.called_ap = called_ap
if not isinstance(calling_ap, C1222CallingAPTitle):
calling_ap = C1222CallingAPTitle(calling_ap)
self.calling_ap = calling_ap
self.logged_in = False
self._initialized = False
self.c1219_endian = '<'
self.caching_enabled = enable_cache
self._cacheable_tables = [0, 1]
self._table_cache = {}
if enable_cache:
self.logger.info('selective table caching has been enabled')
def start_listener(self):
if self.server_sock_h is not None:
raise Exception('server socket already created')
self.server_sock_h = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.server_sock_h.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.server_sock_h.bind(self.bind_host)
self.server_sock_h.listen(1)
def stop_listener(self):
if self.server_sock_h is None:
return
self.server_sock_h.close()
self.server_sock_h = None
def recv(self):
if self.read_sock_h is None:
readable = select.select([self.sock_h.fileno(), self.server_sock_h.fileno()], [], [], self.read_timeout)
readable = readable[0]
if len(readable) > 1:
raise C1222IOError('too many file handles available for reading')
if len(readable) < 1:
raise C1222IOError('not enough file handles available for reading')
readable = readable[0]
if readable == self.server_sock_h.fileno():
(self.read_sock_h, addr) = self.server_sock_h.accept()
self.logger.info("received connection from {0}:{1}".format(addr[0], addr[1]))
self.stop_listener()
elif readable == self.sock_h.fileno():
self.read_sock_h = self.sock_h
self.stop_listener()
else:
raise C1222IOError('unknown file handle is available for reading')
data = b''
while sock_read_ready(self.read_sock_h, self.read_timeout):
tmp_data = self.read_sock_h.recv(8192)
data += tmp_data
if len(tmp_data) != 8192:
break
pkt = C1222Packet.from_bytes(data)
if not isinstance(pkt.data, C1222UserInformation):
return pkt.data
return C1222EPSEM.from_bytes(pkt.data.data)
def send(self, data):
pkt = C1222Packet(self.called_ap, self.calling_ap, random.randint(0, 999999), data=C1222UserInformation(C1222EPSEM(data)))
self.sock_h.send(pkt.build())
def start(self):
self.send(C1222IdentRequest())
try:
self.recv()
except C1222IOError:
self.logger.error('received incorrect response to identification service request')
else:
return True
return False
def close(self):
self.sock_h.close()
if self.read_sock_h is not None:
self.read_sock_h.close()
self.stop_listener()
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