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# Copyright (C) 2006 Dimitur Kirov <dkirov AT gmail.com>
# Jean-Marie Traissard <jim AT lapin.org>
# Copyright (C) 2007-2014 Yann Leboulanger <asterix AT lagaule.org>
#
# This file is part of Gajim.
#
# Gajim 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; version 3 only.
#
# Gajim 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 Gajim. If not, see <http://www.gnu.org/licenses/>.
import errno
import logging
import socket
import struct
import nbxmpp
from nbxmpp.idlequeue import IdleObject
from nbxmpp.namespaces import Namespace
from gajim.common import app
from gajim.common import helpers
from gajim.common.file_props import FilesProp
from gajim.common.socks5 import Socks5
log = logging.getLogger('gajim.c.proxy65_manager')
S_INITIAL = 0
S_STARTED = 1
S_RESOLVED = 2
S_ACTIVATED = 3
S_FINISHED = 4
CONNECT_TIMEOUT = 20
class Proxy65Manager:
'''
Keep records for file transfer proxies. Each time account establishes a
connection to its server call proxy65manger.resolve(proxy) for every proxy
that is configured within the account. The class takes care to resolve and
test each proxy only once
'''
def __init__(self, idlequeue):
# dict {proxy: proxy properties}
self.idlequeue = idlequeue
self.proxies = {}
# dict {account: proxy} default proxy for account
self.default_proxies = {}
def resolve(self, proxy, connection, sender_jid, default=None,
testit=True):
'''
Start
if testit=False, Gajim won't try to resolve it
'''
if proxy not in self.proxies:
# proxy is being resolved for the first time
resolver = ProxyResolver(proxy, sender_jid, testit)
self.proxies[proxy] = resolver
resolver.add_connection(connection)
if default:
# add this proxy as default for account
self.default_proxies[default] = proxy
def disconnect(self, connection):
for resolver in self.proxies.values():
resolver.disconnect(connection)
def resolve_result(self, proxy, query):
if proxy not in self.proxies:
return
jid = None
for item in query.getChildren():
if item.getName() == 'streamhost':
host = item.getAttr('host')
jid = item.getAttr('jid')
port = item.getAttr('port')
try:
port = int(port)
except (ValueError, TypeError):
port = 1080
if not host or not jid:
self.proxies[proxy]._on_connect_failure()
self.proxies[proxy].resolve_result(host, port, jid)
# we can have only one streamhost
raise nbxmpp.NodeProcessed
def error_cb(self, proxy, query):
sid = query.getAttr('sid')
for resolver in self.proxies.values():
if resolver.sid == sid:
resolver.keep_conf()
break
def get_default_for_name(self, account):
if account in self.default_proxies:
return self.default_proxies[account]
def get_proxy(self, proxy, account):
if proxy in self.proxies:
resolver = self.proxies[proxy]
if resolver.state == S_FINISHED:
return (resolver.host, resolver.port, resolver.jid)
return (None, 0, None)
class ProxyResolver:
def resolve_result(self, host, port, jid):
'''
Test if host has a real proxy65 listening on port
'''
self.host = str(host)
self.port = int(port)
self.jid = str(jid)
if not self.testit:
self.state = S_FINISHED
return
self.state = S_INITIAL
log.info('start resolving %s:%s', self.host, self.port)
self.receiver_tester = ReceiverTester(
self.host, self.port, self.jid,
self.sid, self.sender_jid, self._on_receiver_success,
self._on_connect_failure)
self.receiver_tester.connect()
def _on_receiver_success(self):
log.debug('Receiver successfully connected %s:%s',
self.host, self.port)
self.host_tester = HostTester(
self.host, self.port, self.jid,
self.sid, self.sender_jid, self._on_connect_success,
self._on_connect_failure)
self.host_tester.connect()
def _on_connect_success(self):
log.debug('Host successfully connected %s:%s', self.host, self.port)
iq = nbxmpp.Protocol(name='iq', to=self.jid, typ='set')
query = iq.setTag('query')
query.setNamespace(Namespace.BYTESTREAM)
query.setAttr('sid', self.sid)
activate = query.setTag('activate')
activate.setData('test@gajim.org/test2')
if self.active_connection:
log.debug('Activating bytestream on %s:%s', self.host, self.port)
self.active_connection.SendAndCallForResponse(
iq, self._result_received)
self.state = S_ACTIVATED
else:
self.state = S_INITIAL
def _result_received(self, _nbxmpp_client, data):
self.disconnect(self.active_connection)
if data.getType() == 'result':
self.keep_conf()
else:
self._on_connect_failure()
def keep_conf(self):
log.debug('Bytestream activated %s:%s', self.host, self.port)
self.state = S_FINISHED
def _on_connect_failure(self):
log.debug('Connection failed with %s:%s', self.host, self.port)
self.state = S_FINISHED
self.host = None
self.port = 0
self.jid = None
def disconnect(self, connection):
if self.host_tester:
self.host_tester.disconnect()
FilesProp.deleteFileProp(self.host_tester.file_props)
self.host_tester = None
if self.receiver_tester:
self.receiver_tester.disconnect()
FilesProp.deleteFileProp(self.receiver_tester.file_props)
self.receiver_tester = None
try:
self.connections.remove(connection)
except ValueError:
pass
if connection == self.active_connection:
self.active_connection = None
if self.state != S_FINISHED:
self.state = S_INITIAL
self.try_next_connection()
def try_next_connection(self):
'''
Try to resolve proxy with the next possible connection
'''
if self.connections:
connection = self.connections.pop(0)
self.start_resolve(connection)
def add_connection(self, connection):
'''
Add a new connection in case the first fails
'''
self.connections.append(connection)
if self.state == S_INITIAL:
self.start_resolve(connection)
def start_resolve(self, connection):
'''
Request network address from proxy
'''
self.state = S_STARTED
self.active_connection = connection
iq = nbxmpp.Protocol(name='iq', to=self.proxy, typ='get')
query = iq.setTag('query')
query.setNamespace(Namespace.BYTESTREAM)
connection.send(iq)
def __init__(self, proxy, sender_jid, testit):
'''
if testit is False, don't test it, only get IP/port
'''
self.proxy = proxy
self.state = S_INITIAL
self.active_connection = None
self.connections = []
self.host_tester = None
self.receiver_tester = None
self.jid = None
self.host = None
self.port = None
self.sid = helpers.get_random_string()
self.sender_jid = sender_jid
self.testit = testit
class HostTester(Socks5, IdleObject):
'''
Fake proxy tester
'''
def __init__(self,
host,
port,
jid,
sid,
sender_jid,
on_success,
on_failure):
'''
Try to establish and auth to proxy at (host, port)
Calls on_success, or on_failure according to the result.
'''
IdleObject.__init__(self)
self.host = host
self.port = port
self.jid = jid
self.on_success = on_success
self.on_failure = on_failure
self._sock = None
self.file_props = FilesProp.getNewFileProp(jid, sid)
self.file_props.is_a_proxy = True
self.file_props.proxy_sender = sender_jid
self.file_props.proxy_receiver = 'test@gajim.org/test2'
Socks5.__init__(self, app.idlequeue, host, port, None, None, None)
self.sid = sid
def connect(self):
'''
Create the socket and plug it to the idlequeue
'''
if self.host is None:
self.on_failure()
return None
self._sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self._sock.setblocking(False)
self.fd = self._sock.fileno()
self.state = 0 # about to be connected
app.idlequeue.plug_idle(self, True, False)
self.do_connect()
self.idlequeue.set_read_timeout(self.fd, CONNECT_TIMEOUT)
return None
def read_timeout(self):
self.idlequeue.remove_timeout(self.fd)
self.pollend()
def pollend(self):
self.disconnect()
self.on_failure()
def pollout(self):
self.idlequeue.remove_timeout(self.fd)
if self.state == 0:
self.do_connect()
return
if self.state == 1: # send initially: version and auth types
data = self._get_auth_buff()
self.send_raw(data)
else:
return
self.state += 1
# unplug and plug for reading
app.idlequeue.plug_idle(self, False, True)
app.idlequeue.set_read_timeout(self.fd, CONNECT_TIMEOUT)
def pollin(self):
self.idlequeue.remove_timeout(self.fd)
if self.state == 2:
self.idlequeue.set_read_timeout(self.fd, CONNECT_TIMEOUT)
# begin negotiation. on success 'address' != 0
buff = self.receive()
if buff == b'':
# end connection
self.pollend()
return
# read auth response
if buff is None or len(buff) != 2:
return None
version, method = struct.unpack('!BB', buff[:2])
if version != 0x05 or method == 0xff:
self.pollend()
return
data = self._get_request_buff(self._get_sha1_auth())
self.send_raw(data)
self.state += 1
log.debug('Host authenticating to %s:%s', self.host, self.port)
elif self.state == 3:
log.debug('Host authenticated to %s:%s', self.host, self.port)
self.on_success()
self.disconnect()
self.state += 1
else:
raise AssertionError('unexpected state: %d' % self.state)
def do_connect(self):
try:
self._sock.connect((self.host, self.port))
self._sock.setblocking(False)
log.debug('Host Connecting to %s:%s', self.host, self.port)
self._send = self._sock.send
self._recv = self._sock.recv
except Exception as ee:
errnum = ee.errno
# 56 is for freebsd
if errnum in (errno.EINPROGRESS, errno.EALREADY, errno.EWOULDBLOCK):
# still trying to connect
return
# win32 needs this
if errnum not in (0, 10056, errno.EISCONN):
# connection failed
self.on_failure()
return
# socket is already connected
self._sock.setblocking(False)
self._send = self._sock.send
self._recv = self._sock.recv
self.buff = b''
self.state = 1 # connected
log.debug('Host connected to %s:%s', self.host, self.port)
self.idlequeue.plug_idle(self, True, False)
return
class ReceiverTester(Socks5, IdleObject):
'''
Fake proxy tester
'''
def __init__(self,
host,
port,
jid,
sid,
sender_jid,
on_success,
on_failure):
'''
Try to establish and auth to proxy at (host, port)
Call on_success, or on_failure according to the result.
'''
IdleObject.__init__(self)
self.host = host
self.port = port
self.jid = jid
self.on_success = on_success
self.on_failure = on_failure
self._sock = None
self.file_props = FilesProp.getNewFileProp(jid, sid)
self.file_props.is_a_proxy = True
self.file_props.proxy_sender = sender_jid
self.file_props.proxy_receiver = 'test@gajim.org/test2'
Socks5.__init__(self, app.idlequeue, host, port, None, None, None)
self.sid = sid
def connect(self):
'''
Create the socket and plug it to the idlequeue
'''
if self.host is None:
self.on_failure()
return None
self._sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self._sock.setblocking(False)
self.fd = self._sock.fileno()
self.state = 0 # about to be connected
app.idlequeue.plug_idle(self, True, False)
self.do_connect()
self.idlequeue.set_read_timeout(self.fd, CONNECT_TIMEOUT)
return None
def read_timeout(self):
self.idlequeue.remove_timeout(self.fd)
self.pollend()
def pollend(self):
self.disconnect()
self.on_failure()
def pollout(self):
self.idlequeue.remove_timeout(self.fd)
if self.state == 0:
self.do_connect()
return
if self.state == 1: # send initially: version and auth types
data = self._get_auth_buff()
self.send_raw(data)
else:
return
self.state += 1
# unplug and plug for reading
app.idlequeue.plug_idle(self, False, True)
app.idlequeue.set_read_timeout(self.fd, CONNECT_TIMEOUT)
def pollin(self):
self.idlequeue.remove_timeout(self.fd)
if self.state in (2, 3):
self.idlequeue.set_read_timeout(self.fd, CONNECT_TIMEOUT)
# begin negotiation. on success 'address' != 0
buff = self.receive()
if buff == b'':
# end connection
self.pollend()
return
if self.state == 2:
# read auth response
if buff is None or len(buff) != 2:
return None
version, method = struct.unpack('!BB', buff[:2])
if version != 0x05 or method == 0xff:
self.pollend()
return
log.debug('Receiver authenticating to %s:%s', self.host, self.port)
data = self._get_request_buff(self._get_sha1_auth())
self.send_raw(data)
self.state += 1
elif self.state == 3:
# read connect response
if buff is None or len(buff) < 2:
return None
version, reply = struct.unpack('!BB', buff[:2])
if version != 0x05 or reply != 0x00:
self.pollend()
return
log.debug('Receiver authenticated to %s:%s', self.host, self.port)
self.on_success()
self.disconnect()
self.state += 1
else:
raise AssertionError('unexpected state: %d' % self.state)
def do_connect(self):
try:
self._sock.setblocking(False)
self._sock.connect((self.host, self.port))
log.debug('Receiver Connecting to %s:%s', self.host, self.port)
self._send = self._sock.send
self._recv = self._sock.recv
except Exception as ee:
errnum = ee.errno
# 56 is for freebsd
if errnum in (errno.EINPROGRESS, errno.EALREADY, errno.EWOULDBLOCK):
# still trying to connect
return
# win32 needs this
if errnum not in (0, 10056, errno.EISCONN):
# connection failed
self.on_failure()
return
# socket is already connected
self._sock.setblocking(False)
self._send = self._sock.send
self._recv = self._sock.recv
self.buff = ''
self.state = 1 # connected
log.debug('Receiver connected to %s:%s', self.host, self.port)
self.idlequeue.plug_idle(self, True, False)
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