gajim-plural/gajim/common/jingle_transport.py

496 lines
17 KiB
Python

# 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/>.
"""
Handles Jingle Transports (currently only ICE-UDP)
"""
from typing import Any # pylint: disable=unused-import
from typing import Dict # pylint: disable=unused-import
import logging
import socket
from enum import IntEnum, unique
import nbxmpp
from gajim.common import app
log = logging.getLogger('gajim.c.jingle_transport')
transports = {} # type: Dict[str, Any]
def get_jingle_transport(node):
namespace = node.getNamespace()
if namespace in transports:
return transports[namespace](node)
@unique
class TransportType(IntEnum):
"""
Possible types of a JingleTransport
"""
ICEUDP = 1
SOCKS5 = 2
IBB = 3
class JingleTransport:
"""
An abstraction of a transport in Jingle sessions
"""
__slots__ = ['type_', 'candidates', 'remote_candidates', 'connection',
'file_props', 'ourjid', 'sid']
def __init__(self, type_):
self.type_ = type_
self.candidates = []
self.remote_candidates = []
self.connection = None
self.file_props = None
self.ourjid = None
self.sid = None
def _iter_candidates(self):
for candidate in self.candidates:
yield self.make_candidate(candidate)
def make_candidate(self, candidate):
"""
Build a candidate stanza for the given candidate
"""
def make_transport(self, candidates=None):
"""
Build a transport stanza with the given candidates (or self.candidates if
candidates is None)
"""
if not candidates:
candidates = list(self._iter_candidates())
else:
candidates = (self.make_candidate(candidate) for candidate in candidates)
transport = nbxmpp.Node('transport', payload=candidates)
return transport
def parse_transport_stanza(self, transport):
"""
Return the list of transport candidates from a transport stanza
"""
return []
def set_connection(self, conn):
self.connection = conn
if not self.sid:
self.sid = self.connection.connection.getAnID()
def set_file_props(self, file_props):
self.file_props = file_props
def set_our_jid(self, jid):
self.ourjid = jid
def set_sid(self, sid):
self.sid = sid
class JingleTransportSocks5(JingleTransport):
"""
Socks5 transport in jingle scenario
Note: Don't forget to call set_file_props after initialization
"""
def __init__(self, node=None):
JingleTransport.__init__(self, TransportType.SOCKS5)
self.connection = None
self.remote_candidates = []
self.sid = None
if node and node.getAttr('sid'):
self.sid = node.getAttr('sid')
def make_candidate(self, candidate):
log.info('candidate dict, %s', candidate)
attrs = {
'cid': candidate['candidate_id'],
'host': candidate['host'],
'jid': candidate['jid'],
'port': candidate['port'],
'priority': candidate['priority'],
'type': candidate['type']
}
return nbxmpp.Node('candidate', attrs=attrs)
def make_transport(self, candidates=None, add_candidates=True):
if add_candidates:
self._add_local_ips_as_candidates()
self._add_additional_candidates()
self._add_proxy_candidates()
transport = JingleTransport.make_transport(self, candidates)
else:
transport = nbxmpp.Node('transport')
transport.setNamespace(nbxmpp.NS_JINGLE_BYTESTREAM)
transport.setAttr('sid', self.sid)
if self.file_props.dstaddr:
transport.setAttr('dstaddr', self.file_props.dstaddr)
return transport
def parse_transport_stanza(self, transport):
candidates = []
for candidate in transport.iterTags('candidate'):
typ = 'direct' # default value
if candidate.has_attr('type'):
typ = candidate['type']
cand = {
'state': 0,
'target': self.ourjid,
'host': candidate['host'],
'port': int(candidate['port']),
'candidate_id': candidate['cid'],
'type': typ,
'priority': candidate['priority']
}
candidates.append(cand)
# we need this when we construct file_props on session-initiation
if candidates:
self.remote_candidates = candidates
return candidates
def _add_candidates(self, candidates):
for cand in candidates:
in_remote = False
for cand2 in self.remote_candidates:
if cand['host'] == cand2['host'] and \
cand['port'] == cand2['port']:
in_remote = True
break
if not in_remote:
self.candidates.append(cand)
def _add_local_ips_as_candidates(self):
if not app.config.get_per('accounts', self.connection.name,
'ft_send_local_ips'):
return
if not self.connection:
return
port = int(app.config.get('file_transfers_port'))
#type preference of connection type. XEP-0260 section 2.2
type_preference = 126
priority = (2**16) * type_preference
hosts = set()
local_ip_cand = []
candidate = {
'host': self.connection.peerhost[0],
'candidate_id': self.connection.connection.getAnID(),
'port': port,
'type': 'direct',
'jid': self.ourjid,
'priority': priority
}
hosts.add(self.connection.peerhost[0])
local_ip_cand.append(candidate)
try:
for addrinfo in socket.getaddrinfo(socket.gethostname(), None):
addr = addrinfo[4][0]
if not addr in hosts and not addr.startswith('127.') and \
addr != '::1':
candidate = {
'host': addr,
'candidate_id': self.connection.connection.getAnID(),
'port': port,
'type': 'direct',
'jid': self.ourjid,
'priority': priority,
'initiator': self.file_props.sender,
'target': self.file_props.receiver
}
hosts.add(addr)
local_ip_cand.append(candidate)
except socket.gaierror:
pass # ignore address-related errors for getaddrinfo
try:
from netifaces import interfaces, ifaddresses, AF_INET, AF_INET6
for ifaceName in interfaces():
addresses = ifaddresses(ifaceName)
if AF_INET in addresses:
for address in addresses[AF_INET]:
addr = address['addr']
if addr in hosts or addr.startswith('127.'):
continue
candidate = {
'host': addr,
'candidate_id': self.connection.connection.getAnID(),
'port': port,
'type': 'direct',
'jid': self.ourjid,
'priority': priority,
'initiator': self.file_props.sender,
'target': self.file_props.receiver
}
hosts.add(addr)
local_ip_cand.append(candidate)
if AF_INET6 in addresses:
for address in addresses[AF_INET6]:
addr = address['addr']
if addr in hosts or addr.startswith('::1') or \
addr.count(':') != 7:
continue
candidate = {
'host': addr,
'candidate_id': self.connection.connection.getAnID(),
'port': port,
'type': 'direct',
'jid': self.ourjid,
'priority': priority,
'initiator': self.file_props.sender,
'target': self.file_props.receiver
}
hosts.add(addr)
local_ip_cand.append(candidate)
except ImportError:
pass
self._add_candidates(local_ip_cand)
def _add_additional_candidates(self):
if not self.connection:
return
type_preference = 126
priority = (2**16) * type_preference
additional_ip_cand = []
port = int(app.config.get('file_transfers_port'))
ft_add_hosts = app.config.get('ft_add_hosts_to_send')
if ft_add_hosts:
hosts = [e.strip() for e in ft_add_hosts.split(',')]
for host in hosts:
candidate = {
'host': host,
'candidate_id': self.connection.connection.getAnID(),
'port': port,
'type': 'direct',
'jid': self.ourjid,
'priority': priority,
'initiator': self.file_props.sender,
'target': self.file_props.receiver
}
additional_ip_cand.append(candidate)
self._add_candidates(additional_ip_cand)
def _add_proxy_candidates(self):
if not self.connection:
return
type_preference = 10
priority = (2**16) * type_preference
proxy_cand = []
socks5conn = self.connection
proxyhosts = socks5conn._get_file_transfer_proxies_from_config(self.file_props)
if proxyhosts:
self.file_props.proxyhosts = proxyhosts
for proxyhost in proxyhosts:
candidate = {
'host': proxyhost['host'],
'candidate_id': self.connection.connection.getAnID(),
'port': int(proxyhost['port']),
'type': 'proxy',
'jid': proxyhost['jid'],
'priority': priority,
'initiator': self.file_props.sender,
'target': self.file_props.receiver
}
proxy_cand.append(candidate)
self._add_candidates(proxy_cand)
def get_content(self):
sesn = self.connection.get_jingle_session(self.ourjid,
self.file_props.sid)
for content in sesn.contents.values():
if content.transport == self:
return content
def _on_proxy_auth_ok(self, proxy):
log.info('proxy auth ok for %s', str(proxy))
# send activate request to proxy, send activated confirmation to peer
if not self.connection:
return
sesn = self.connection.get_jingle_session(self.ourjid,
self.file_props.sid)
if sesn is None:
return
iq = nbxmpp.Iq(to=proxy['jid'], frm=self.ourjid, typ='set')
auth_id = "au_" + proxy['sid']
iq.setID(auth_id)
query = iq.setTag('query', namespace=nbxmpp.NS_BYTESTREAM)
query.setAttr('sid', proxy['sid'])
activate = query.setTag('activate')
activate.setData(sesn.peerjid)
iq.setID(auth_id)
self.connection.connection.send(iq)
content = nbxmpp.Node('content')
content.setAttr('creator', 'initiator')
content_object = self.get_content()
content.setAttr('name', content_object.name)
transport = nbxmpp.Node('transport')
transport.setNamespace(nbxmpp.NS_JINGLE_BYTESTREAM)
transport.setAttr('sid', proxy['sid'])
activated = nbxmpp.Node('activated')
cid = None
if 'cid' in proxy:
cid = proxy['cid']
else:
for host in self.candidates:
if host['host'] == proxy['host'] and host['jid'] == proxy['jid'] \
and host['port'] == proxy['port']:
cid = host['candidate_id']
break
if cid is None:
raise Exception('cid is missing')
activated.setAttr('cid', cid)
transport.addChild(node=activated)
content.addChild(node=transport)
sesn.send_transport_info(content)
class JingleTransportIBB(JingleTransport):
def __init__(self, node=None, block_sz=None):
JingleTransport.__init__(self, TransportType.IBB)
if block_sz:
self.block_sz = block_sz
else:
self.block_sz = '4096'
self.connection = None
self.sid = None
if node and node.getAttr('sid'):
self.sid = node.getAttr('sid')
def make_transport(self):
transport = nbxmpp.Node('transport')
transport.setNamespace(nbxmpp.NS_JINGLE_IBB)
transport.setAttr('block-size', self.block_sz)
transport.setAttr('sid', self.sid)
return transport
try:
from gi.repository import Farstream
except ImportError:
pass
class JingleTransportICEUDP(JingleTransport):
def __init__(self, node):
JingleTransport.__init__(self, TransportType.ICEUDP)
def make_candidate(self, candidate):
types = {
Farstream.CandidateType.HOST: 'host',
Farstream.CandidateType.SRFLX: 'srflx',
Farstream.CandidateType.PRFLX: 'prflx',
Farstream.CandidateType.RELAY: 'relay',
Farstream.CandidateType.MULTICAST: 'multicast'
}
attrs = {
'component': candidate.component_id,
'foundation': '1', # hack
'generation': '0',
'ip': candidate.ip,
'network': '0',
'port': candidate.port,
'priority': int(candidate.priority), # hack
'id': app.get_an_id()
}
if candidate.type in types:
attrs['type'] = types[candidate.type]
if candidate.proto == Farstream.NetworkProtocol.UDP:
attrs['protocol'] = 'udp'
else:
# we actually don't handle properly different tcp options in jingle
attrs['protocol'] = 'tcp'
return nbxmpp.Node('candidate', attrs=attrs)
def make_transport(self, candidates=None):
transport = JingleTransport.make_transport(self, candidates)
transport.setNamespace(nbxmpp.NS_JINGLE_ICE_UDP)
if self.candidates and self.candidates[0].username and \
self.candidates[0].password:
transport.setAttr('ufrag', self.candidates[0].username)
transport.setAttr('pwd', self.candidates[0].password)
return transport
def parse_transport_stanza(self, transport):
candidates = []
for candidate in transport.iterTags('candidate'):
foundation = str(candidate['foundation'])
component_id = int(candidate['component'])
ip = str(candidate['ip'])
port = int(candidate['port'])
base_ip = None
base_port = 0
if candidate['protocol'] == 'udp':
proto = Farstream.NetworkProtocol.UDP
else:
# we actually don't handle properly different tcp options in
# jingle
proto = Farstream.NetworkProtocol.TCP
priority = int(candidate['priority'])
types = {
'host': Farstream.CandidateType.HOST,
'srflx': Farstream.CandidateType.SRFLX,
'prflx': Farstream.CandidateType.PRFLX,
'relay': Farstream.CandidateType.RELAY,
'multicast': Farstream.CandidateType.MULTICAST
}
if 'type' in candidate and candidate['type'] in types:
type_ = types[candidate['type']]
else:
log.warning('Unknown type %s', candidate['type'])
type_ = Farstream.CandidateType.HOST
username = str(transport['ufrag'])
password = str(transport['pwd'])
ttl = 0
cand = Farstream.Candidate.new_full(foundation, component_id, ip,
port, base_ip, base_port,
proto, priority, type_,
username, password, ttl)
candidates.append(cand)
self.remote_candidates.extend(candidates)
return candidates
transports[nbxmpp.NS_JINGLE_ICE_UDP] = JingleTransportICEUDP
transports[nbxmpp.NS_JINGLE_BYTESTREAM] = JingleTransportSocks5
transports[nbxmpp.NS_JINGLE_IBB] = JingleTransportIBB