431 lines
15 KiB
Python
431 lines
15 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 socket
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import re
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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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import pybonjour
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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_serviceCB, remove_serviceCB, name_conflictCB,
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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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# 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_serviceCB = new_serviceCB
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self.remove_serviceCB = remove_serviceCB
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self.name_conflictCB = name_conflictCB
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self.disconnected_CB = disconnected_CB
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self.error_CB = error_CB
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self.contacts = {} # all current local contacts with data
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self.connected = False
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self.announced = False
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self.invalid_self_contact = {}
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self.resolved_contacts = {}
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self.resolved = []
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self.queried = []
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def browse_callback(self, sdRef, flags, interfaceIndex, errorCode,
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serviceName, regtype, replyDomain):
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log.debug('Found service %s in domain %s on %i(type: %s).',
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serviceName, replyDomain, interfaceIndex, regtype)
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if not self.connected:
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return
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if errorCode != pybonjour.kDNSServiceErr_NoError:
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log.debug('Error in browse_callback: %s', str(errorCode))
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return
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if not (flags & pybonjour.kDNSServiceFlagsAdd):
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self.remove_service_callback(serviceName)
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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 = pybonjour.DNSServiceResolve(
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0, interfaceIndex, serviceName,
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regtype, replyDomain, 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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pybonjour.DNSServiceProcessResult(resolve_sdRef)
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else:
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self.resolved.pop()
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except pybonjour.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 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_serviceCB(key)
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return
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def txt_array_to_dict(self, txt):
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if isinstance(txt, pybonjour.TXTRecord):
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items = txt._items
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else:
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items = pybonjour.TXTRecord.parse(txt)._items
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return dict((v[0], v[1]) for v in items.values())
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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('(?<!\\\\)\.', 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, interfaceIndex, errorCode,
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hosttarget, rrtype, rrclass, rdata, ttl):
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if errorCode != pybonjour.kDNSServiceErr_NoError:
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log.error('Error in query_record_callback: %s', str(errorCode))
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return
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name, bare_name, protocol, domain = self._parse_name(hosttarget)
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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 query_record_callback(self, sdRef, flags, interfaceIndex, errorCode,
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hosttarget, rrtype, rrclass, rdata, ttl):
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if errorCode != pybonjour.kDNSServiceErr_NoError:
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log.error('Error in query_record_callback: %s', str(errorCode))
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return
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fullname, port, txtRecord = self.resolved_contacts[hosttarget]
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txt = pybonjour.TXTRecord.parse(txtRecord)
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ip = socket.inet_ntoa(rdata)
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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, interfaceIndex)
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log.info('Host %s, ip %s, port %i, TXT data: %s',
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hosttarget, ip, port, txt._items)
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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 = [(interfaceIndex, protocol, hosttarget, fullname, ip, port)]
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self.contacts[name] = (name, domain, resolved_info, bare_name, txtRecord)
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self.new_serviceCB(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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(interfaceIndex, protocol, hosttarget, fullname, ip, port),
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bare_name, txtRecord)
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self.queried.append(True)
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def service_resolved_callback(self, sdRef, flags, interfaceIndex,
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errorCode, fullname, hosttarget, port,
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txtRecord):
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if errorCode != pybonjour.kDNSServiceErr_NoError:
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log.error('Error in service_resolved_callback: %s', str(errorCode))
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return
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self.resolved_contacts[hosttarget] = (fullname, port, txtRecord)
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try:
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query_sdRef = None
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query_sdRef = \
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pybonjour.DNSServiceQueryRecord(
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interfaceIndex=interfaceIndex,
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fullname=hosttarget,
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rrtype=pybonjour.kDNSServiceType_A,
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callBack=self.query_record_callback)
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while not self.queried:
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ready = select.select([query_sdRef], [], [], resolve_timeout)
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if query_sdRef not in ready[0]:
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log.warning('Query record timed out')
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break
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pybonjour.DNSServiceProcessResult(query_sdRef)
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else:
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self.queried.pop()
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except pybonjour.BonjourError as error:
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if error.errorCode == pybonjour.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 query_sdRef:
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query_sdRef.close()
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self.resolved.append(True)
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def service_added_callback(self, sdRef, flags, errorCode,
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name, regtype, domain):
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if errorCode == pybonjour.kDNSServiceErr_NoError:
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log.info('Service successfully added')
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elif errorCode == pybonjour.kDNSServiceErr_NameConflict:
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log.error('Error while adding service. %s', errorCode)
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parts = self.username.split(' ')
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# check if last part is a number and if, increment it
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try:
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stripped = str(int(parts[-1]))
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except Exception:
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stripped = 1
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alternative_name = self.username + str(stripped + 1)
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self.name_conflictCB(alternative_name)
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else:
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self.error_CB(_('Error while adding service. %s') % str(errorCode))
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# make zeroconf-valid names
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def replace_show(self, show):
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if show in ['chat', 'online', '']:
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return 'avail'
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elif 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 = pybonjour.DNSServiceRegister(
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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=pybonjour.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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pybonjour.DNSServiceProcessResult(self.service_sdRef)
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except pybonjour.BonjourError as error:
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if error.errorCode == pybonjour.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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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 pybonjour.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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else:
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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 hasattr(self, 'browse_sdRef'):
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self.browse_sdRef.close()
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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 = pybonjour.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 pybonjour.BonjourError as error:
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if error.errorCode == pybonjour.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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pybonjour.DNSServiceProcessResult(self.browse_sdRef)
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except pybonjour.BonjourError as error:
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if error.errorCode == pybonjour.kDNSServiceErr_ServiceNotRunning:
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log.info('Service not running')
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return False
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else:
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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 querys 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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try:
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query_sdRef = None
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query_sdRef = \
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pybonjour.DNSServiceQueryRecord(
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interfaceIndex=pybonjour.kDNSServiceInterfaceIndexAny,
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fullname=val[Constant.RESOLVED_INFO][0][Constant.BARE_NAME],
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rrtype=pybonjour.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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pybonjour.DNSServiceProcessResult(query_sdRef)
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else:
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self.queried.pop()
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except pybonjour.BonjourError as error:
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if error.errorCode == pybonjour.kDNSServiceErr_ServiceNotRunning:
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log.info('Service not running')
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return False
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else:
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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 = pybonjour.TXTRecord(self.txt, strict=True)
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try:
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pybonjour.DNSServiceUpdateRecord(self.service_sdRef, None, 0, txt)
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except pybonjour.BonjourError as e:
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log.error('Error when updating TXT Record: %s', e)
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return False
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return True
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