459 lines
16 KiB
Python
459 lines
16 KiB
Python
# Copyright (C) 2006 Stefan Bethge <stefan@lanpartei.de>
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# Copyright (C) 2006 Philipp Hörist <philipp@hoerist.com>
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#
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# This file is part of Gajim.
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#
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# Gajim is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published
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# by the Free Software Foundation; version 3 only.
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#
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# Gajim is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Gajim. If not, see <http://www.gnu.org/licenses/>.
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import logging
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import select
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import re
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from gajim.common.i18n import _
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from gajim.common.zeroconf.zeroconf import Constant
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log = logging.getLogger('gajim.c.z.zeroconf_bonjour')
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try:
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from pybonjour import kDNSServiceErr_NoError
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from pybonjour import kDNSServiceErr_ServiceNotRunning
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from pybonjour import kDNSServiceErr_NameConflict
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from pybonjour import kDNSServiceInterfaceIndexAny
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from pybonjour import kDNSServiceType_TXT
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from pybonjour import kDNSServiceFlagsAdd
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from pybonjour import kDNSServiceFlagsNoAutoRename
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from pybonjour import BonjourError
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from pybonjour import TXTRecord
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from pybonjour import DNSServiceUpdateRecord
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from pybonjour import DNSServiceResolve
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from pybonjour import DNSServiceProcessResult
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from pybonjour import DNSServiceGetAddrInfo
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from pybonjour import DNSServiceQueryRecord
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from pybonjour import DNSServiceBrowse
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from pybonjour import DNSServiceRegister
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except ImportError:
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pass
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resolve_timeout = 1
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class Zeroconf:
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def __init__(self, new_service_cb, remove_service_cb, name_conflict_cb,
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_disconnected_cb, error_cb, name, host, port):
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self.stype = '_presence._tcp'
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self.port = port # listening port that gets announced
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self.username = name
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self.host = host
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self.txt = {} # service data
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self.name = None
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self.connected = False
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self.announced = False
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# XXX these CBs should be set to None when we destroy the object
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# (go offline), because they create a circular reference
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self._new_service_cb = new_service_cb
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self._remove_service_cb = remove_service_cb
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self._name_conflict_cb = name_conflict_cb
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self._error_cb = error_cb
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self._service_sdref = None
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self._browse_sdref = None
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self._contacts = {} # all current local contacts with data
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self._invalid_self_contact = {}
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self._resolved_hosts = {}
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self._resolved = []
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self._queried = []
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def _browse_callback(self, _sdref, flags, interface, error_code,
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service_name, regtype, reply_domain):
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log.debug('Found service %s in domain %s on %i(type: %s).',
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service_name, reply_domain, interface, regtype)
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if not self.connected:
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return
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if error_code != kDNSServiceErr_NoError:
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log.debug('Error in browse_callback: %s', str(error_code))
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return
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if not flags & kDNSServiceFlagsAdd:
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self._remove_service_callback(service_name)
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return
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try:
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# asynchronous resolving
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resolve_sdref = None
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resolve_sdref = DNSServiceResolve(
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0, interface, service_name,
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regtype, reply_domain, self._service_resolved_callback)
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while not self._resolved:
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ready = select.select([resolve_sdref], [], [], resolve_timeout)
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if resolve_sdref not in ready[0]:
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log.info('Resolve timed out')
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break
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DNSServiceProcessResult(resolve_sdref)
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else:
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self._resolved.pop()
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except BonjourError as error:
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log.info('Error when resolving DNS: %s', error)
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finally:
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if resolve_sdref:
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resolve_sdref.close()
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def _remove_service_callback(self, name):
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log.info('Service %s disappeared.', name)
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if not self.connected:
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return
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if name != self.name:
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for key in list(self._contacts.keys()):
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if self._contacts[key][Constant.NAME] == name:
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del self._contacts[key]
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self._remove_service_cb(key)
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return
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@staticmethod
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def txt_array_to_dict(txt):
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if not isinstance(txt, TXTRecord):
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txt = TXTRecord.parse(txt)
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return dict((v[0], v[1]) for v in txt)
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@staticmethod
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def _parse_name(fullname):
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log.debug('Parse name: %s', fullname)
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# TODO: do proper decoding...
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escaping = {r'\.': '.',
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r'\032': ' ',
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r'\064': '@',
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}
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# Split on '.' but do not split on '\.'
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result = re.split(r'(?<!\\\\)\.', fullname)
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name = result[0]
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protocol, domain = result[2:4]
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# Replace the escaped values
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for src, trg in escaping.items():
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name = name.replace(src, trg)
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bare_name = name
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if '@' not in name:
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name = name + '@' + name
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log.debug('End parse: %s %s %s %s',
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name, bare_name, protocol, domain)
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return name, bare_name, protocol, domain
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def _query_txt_callback(self, _sdref, _flags, _interface, error_code,
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hosttarget, _rrtype, _rrclass, rdata, _ttl):
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if error_code != kDNSServiceErr_NoError:
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log.error('Error in query_record_callback: %s', str(error_code))
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return
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name = self._parse_name(hosttarget)[0]
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if name != self.name:
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# update TXT data only, as intended according to
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# resolve_all comment
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old_contact = self._contacts[name]
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self._contacts[name] = old_contact[0:Constant.TXT] + (rdata,) + old_contact[Constant.TXT+1:]
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log.debug(self._contacts[name])
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self._queried.append(True)
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def _getaddrinfo_callback(self, _sdref, _flags, interface, error_code,
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hosttarget, address, _ttl):
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if error_code != kDNSServiceErr_NoError:
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log.error('Error in getaddrinfo_callback: %s', str(error_code))
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return
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fullname, port, txt_record = self._resolved_hosts[hosttarget]
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txt = TXTRecord.parse(txt_record)
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ip = address[1]
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name, bare_name, protocol, domain = self._parse_name(fullname)
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log.info('Service data for service %s on %i:',
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fullname, interface)
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log.info('Host %s, ip %s, port %i, TXT data: %s',
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hosttarget, ip, port, txt)
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if not self.connected:
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return
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# we don't want to see ourselves in the list
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if name != self.name:
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resolved_info = [(interface, protocol, hosttarget,
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fullname, ip, port)]
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self._contacts[name] = (name, domain, resolved_info,
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bare_name, txt_record)
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self._new_service_cb(name)
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else:
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# remember data
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# In case this is not our own record but of another
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# gajim instance on the same machine,
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# it will be used when we get a new name.
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self._invalid_self_contact[name] = \
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(name, domain,
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(interface, protocol, hosttarget, fullname, ip, port),
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bare_name, txt_record)
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self._queried.append(True)
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def _service_resolved_callback(self, _sdref, _flags, interface,
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error_code, fullname, hosttarget, port,
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txt_record):
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if error_code != kDNSServiceErr_NoError:
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log.error('Error in service_resolved_callback: %s', str(error_code))
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return
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self._resolved_hosts[hosttarget] = (fullname, port, txt_record)
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try:
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getaddrinfo_sdref = \
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DNSServiceGetAddrInfo(
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interfaceIndex=interface,
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hostname=hosttarget,
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callBack=self._getaddrinfo_callback)
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while not self._queried:
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ready = select.select(
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[getaddrinfo_sdref], [], [], resolve_timeout)
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if getaddrinfo_sdref not in ready[0]:
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log.warning('GetAddrInfo timed out')
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break
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DNSServiceProcessResult(getaddrinfo_sdref)
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else:
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self._queried.pop()
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except BonjourError as error:
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if error.error_code == kDNSServiceErr_ServiceNotRunning:
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log.info('Service not running')
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else:
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self._error_cb(_('Error while adding service. %s') % error)
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finally:
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if getaddrinfo_sdref:
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getaddrinfo_sdref.close()
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self._resolved.append(True)
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def service_added_callback(self, _sdref, _flags, error_code,
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_name, _regtype, _domain):
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if error_code == kDNSServiceErr_NoError:
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log.info('Service successfully added')
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elif error_code == kDNSServiceErr_NameConflict:
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log.error('Error while adding service. %s', error_code)
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self._name_conflict_cb(self._get_alternativ_name(self.username))
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else:
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error = _('Error while adding service. %s') % str(error_code)
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self._error_cb(error)
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@staticmethod
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def _get_alternativ_name(name):
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if name[-2] == '-':
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try:
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number = int(name[-1])
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except Exception:
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return '%s-1' % name
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return '%s-%s' % (name[:-2], number + 1)
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return '%s-1' % name
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@staticmethod
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def _replace_show(show):
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if show in ['chat', 'online', '']:
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return 'avail'
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if show == 'xa':
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return 'away'
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return show
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def _create_service(self):
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txt = {}
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# remove empty keys
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for key, val in self.txt.items():
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if val:
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txt[key] = val
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txt['port.p2pj'] = self.port
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txt['version'] = 1
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txt['txtvers'] = 1
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# replace gajim's show messages with compatible ones
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if 'status' in self.txt:
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txt['status'] = self._replace_show(self.txt['status'])
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else:
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txt['status'] = 'avail'
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self.txt = txt
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try:
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self._service_sdref = DNSServiceRegister(
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flags=kDNSServiceFlagsNoAutoRename,
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name=self.name,
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regtype=self.stype,
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port=self.port,
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txtRecord=TXTRecord(self.txt, strict=True),
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callBack=self.service_added_callback)
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log.info('Publishing service %s of type %s', self.name, self.stype)
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ready = select.select([self._service_sdref], [], [])
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if self._service_sdref in ready[0]:
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DNSServiceProcessResult(self._service_sdref)
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except BonjourError as error:
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if error.errorCode == kDNSServiceErr_ServiceNotRunning:
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log.info('Service not running')
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else:
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self._error_cb(_('Error while adding service. %s') % error)
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self.disconnect()
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def announce(self):
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if not self.connected:
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return False
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self._create_service()
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self.announced = True
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return True
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def remove_announce(self):
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if not self.announced:
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return False
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if self._service_sdref is None:
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return False
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try:
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self._service_sdref.close()
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self.announced = False
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return True
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except BonjourError as error:
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log.error('Error when removing announce: %s', error)
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return False
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def connect(self):
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self.name = self.username + '@' + self.host # service name
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self.connected = True
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# start browsing
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if self.browse_domain():
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return True
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self.disconnect()
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return False
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def disconnect(self):
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if self.connected:
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self.connected = False
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if self._browse_sdref is not None:
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self._browse_sdref.close()
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self._browse_sdref = None
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self.remove_announce()
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def browse_domain(self, domain=None):
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try:
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self._browse_sdref = DNSServiceBrowse(
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regtype=self.stype,
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domain=domain,
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callBack=self._browse_callback)
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log.info('Starting to browse .local')
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return True
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except BonjourError as error:
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if error.errorCode == kDNSServiceErr_ServiceNotRunning:
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log.info('Service not running')
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else:
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log.error('Error while browsing for services. %s', error)
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return False
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def browse_loop(self):
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try:
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ready = select.select([self._browse_sdref], [], [], 0)
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if self._browse_sdref in ready[0]:
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DNSServiceProcessResult(self._browse_sdref)
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except BonjourError as error:
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if error.errorCode == kDNSServiceErr_ServiceNotRunning:
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log.info('Service not running')
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return False
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log.error('Error while browsing for services. %s', error)
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return True
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# resolve_all() is called every X seconds and queries for new clients
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# and monitors TXT records for changed status
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def resolve_all(self):
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if not self.connected:
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return False
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# for now put here as this is synchronous
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if not self.browse_loop():
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return False
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# Monitor TXT Records with DNSServiceQueryRecord because
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# its more efficient (see pybonjour documentation)
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for val in self._contacts.values():
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bare_name = val[Constant.RESOLVED_INFO][0][Constant.BARE_NAME]
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try:
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query_sdref = None
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query_sdref = \
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DNSServiceQueryRecord(
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interfaceIndex=kDNSServiceInterfaceIndexAny,
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fullname=bare_name,
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rrtype=kDNSServiceType_TXT,
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callBack=self._query_txt_callback)
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while not self._queried:
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ready = select.select(
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[query_sdref], [], [], resolve_timeout)
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if query_sdref not in ready[0]:
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log.info('Query record timed out')
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break
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DNSServiceProcessResult(query_sdref)
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else:
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self._queried.pop()
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except BonjourError as error:
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if error.errorCode == kDNSServiceErr_ServiceNotRunning:
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log.info('Service not running')
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return False
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log.error('Error in query for TXT records. %s', error)
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finally:
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if query_sdref:
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query_sdref.close()
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return True
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def get_contacts(self):
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return self._contacts
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def get_contact(self, jid):
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if jid not in self._contacts:
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return None
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return self._contacts[jid]
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def update_txt(self, show=None):
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if show:
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self.txt['status'] = self._replace_show(show)
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txt = TXTRecord(self.txt, strict=True)
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try:
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DNSServiceUpdateRecord(self._service_sdref, None, 0, txt)
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except BonjourError as error:
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log.error('Error when updating TXT Record: %s', error)
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return False
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return True
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