gajim-plural/src/common/proxy65_manager.py

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##
## Copyright (C) 2006 Gajim Team
##
## Contributors for this file:
## - Dimitur Kirov <dkirov@gmail.com>
##
## 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 socket
import struct
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import errno
import common.xmpp
from common import gajim
from common import helpers
from socks5 import Socks5
from common.xmpp.idlequeue import IdleObject
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 convigured 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, default = None):
''' start '''
if self.proxies.has_key(proxy):
resolver = self.proxies[proxy]
else:
# proxy is being ressolved for the first time
resolver = ProxyResolver(proxy)
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 not self.proxies.has_key(proxy):
return
jid = None
for item in query.getChildren():
if item.getName() == 'streamhost':
host = item.getAttr('host')
port = item.getAttr('port')
jid = item.getAttr('jid')
self.proxies[proxy].resolve_result(host, port, jid)
# we can have only one streamhost
raise common.xmpp.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 self.default_proxies.has_key(account):
return self.default_proxies[account]
def get_proxy(self, proxy, account):
if self.proxies.has_key(proxy):
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 = unicode(host)
self.port = int(port)
self.jid = unicode(jid)
self.state = S_RESOLVED
self.host_tester = HostTester(self.host, self.port, self.jid,
self._on_connect_success, self._on_connect_failure)
self.host_tester.connect()
def _on_connect_success(self):
iq = common.xmpp.Protocol(name = 'iq', to = self.jid, typ = 'set')
query = iq.setTag('query')
query.setNamespace(common.xmpp.NS_BYTESTREAM)
query.setAttr('sid', self.sid)
activate = query.setTag('activate')
activate.setData(self.jid + "/" + self.sid)
if self.active_connection:
self.active_connection.send(iq)
self.state = S_ACTIVATED
else:
self.state = S_INITIAL
def keep_conf(self):
self.state = S_FINISHED
def _on_connect_failure(self):
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()
self.host_tester = None
try:
self.connections.remove(connection)
except ValueError:
pass
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if connection == self.active_connection:
self.active_connection = None
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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 = common.xmpp.Protocol(name = 'iq', to = self.proxy, typ = 'get')
query = iq.setTag('query')
query.setNamespace(common.xmpp.NS_BYTESTREAM)
connection.send(iq)
def __init__(self, proxy):
self.proxy = proxy
self.state = S_INITIAL
self.active_connection = None
self.connections = []
self.host_tester = None
self.jid = None
self.host = None
self.port = None
self.sid = helpers.get_random_string_16()
class HostTester(Socks5, IdleObject):
''' fake proxy tester. '''
def __init__(self, host, port, 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'''
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 = {}
Socks5.__init__(self, gajim.idlequeue, host, port, None, None, None)
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
gajim.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
elif 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
gajim.idlequeue.plug_idle(self, False, True)
gajim.idlequeue.set_read_timeout(self.fd, CONNECT_TIMEOUT)
def pollin(self):
self.idlequeue.remove_timeout(self.fd)
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if self.state == 2:
self.idlequeue.set_read_timeout(self.fd, CONNECT_TIMEOUT)
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# begin negotiation. on success 'address' != 0
buff = self.receive()
if buff == '':
# 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()
self.disconnect()
self.on_success()
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else:
self.disconnect()
def do_connect(self):
try:
self._sock.connect((self.host, self.port))
self._sock.setblocking(False)
self._send=self._sock.send
self._recv=self._sock.recv
except Exception, ee:
(errnum, errstr) = ee
# 56 is for freebsd
if errnum in (errno.EINPROGRESS, errno.EALREADY, errno.EWOULDBLOCK, 56):
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# still trying to connect
return
# win32 needs this
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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
self.idlequeue.plug_idle(self, True, False)
return