hgext/zeroconf/Zeroconf.py
author Phil Cohen <phillco@fb.com>
Sun, 13 Aug 2017 20:06:52 -0700
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simplemerge: use contexts to read file data from, if passed Differential Revision: https://phab.mercurial-scm.org/D374
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from __future__ import absolute_import, print_function
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""" Multicast DNS Service Discovery for Python, v0.12
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    Copyright (C) 2003, Paul Scott-Murphy
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    This module provides a framework for the use of DNS Service Discovery
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    using IP multicast.  It has been tested against the JRendezvous
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    implementation from <a href="http://strangeberry.com">StrangeBerry</a>,
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    and against the mDNSResponder from Mac OS X 10.3.8.
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library 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 GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, see
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    <http://www.gnu.org/licenses/>.
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"""
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"""0.12 update - allow selection of binding interface
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         typo fix - Thanks A. M. Kuchlingi
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         removed all use of word 'Rendezvous' - this is an API change"""
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"""0.11 update - correction to comments for addListener method
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                 support for new record types seen from OS X
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                  - IPv6 address
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                  - hostinfo
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                 ignore unknown DNS record types
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                 fixes to name decoding
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                 works alongside other processes using port 5353 (e.g. Mac OS X)
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                 tested against Mac OS X 10.3.2's mDNSResponder
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                 corrections to removal of list entries for service browser"""
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"""0.10 update - Jonathon Paisley contributed these corrections:
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                 always multicast replies, even when query is unicast
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                 correct a pointer encoding problem
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                 can now write records in any order
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                 traceback shown on failure
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                 better TXT record parsing
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                 server is now separate from name
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                 can cancel a service browser
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                 modified some unit tests to accommodate these changes"""
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"""0.09 update - remove all records on service unregistration
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                 fix DOS security problem with readName"""
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"""0.08 update - changed licensing to LGPL"""
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"""0.07 update - faster shutdown on engine
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                 pointer encoding of outgoing names
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                 ServiceBrowser now works
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                 new unit tests"""
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"""0.06 update - small improvements with unit tests
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                 added defined exception types
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                 new style objects
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                 fixed hostname/interface problem
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                 fixed socket timeout problem
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                 fixed addServiceListener() typo bug
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                 using select() for socket reads
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                 tested on Debian unstable with Python 2.2.2"""
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"""0.05 update - ensure case insensitivity on domain names
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                 support for unicast DNS queries"""
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"""0.04 update - added some unit tests
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                 added __ne__ adjuncts where required
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                 ensure names end in '.local.'
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                 timeout on receiving socket for clean shutdown"""
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__author__ = "Paul Scott-Murphy"
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__email__ = "paul at scott dash murphy dot com"
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__version__ = "0.12"
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import itertools
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import select
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import socket
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import string
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import struct
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import threading
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import time
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import traceback
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__all__ = ["Zeroconf", "ServiceInfo", "ServiceBrowser"]
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# hook for threads
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globals()['_GLOBAL_DONE'] = 0
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# Some timing constants
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_UNREGISTER_TIME = 125
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_CHECK_TIME = 175
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_REGISTER_TIME = 225
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_LISTENER_TIME = 200
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_BROWSER_TIME = 500
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# Some DNS constants
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_MDNS_ADDR = '224.0.0.251'
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_MDNS_PORT = 5353
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_DNS_PORT = 53
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_DNS_TTL = 60 * 60 # one hour default TTL
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_MAX_MSG_TYPICAL = 1460 # unused
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_MAX_MSG_ABSOLUTE = 8972
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_FLAGS_QR_MASK = 0x8000 # query response mask
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_FLAGS_QR_QUERY = 0x0000 # query
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_FLAGS_QR_RESPONSE = 0x8000 # response
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_FLAGS_AA = 0x0400 # Authoritative answer
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_FLAGS_TC = 0x0200 # Truncated
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_FLAGS_RD = 0x0100 # Recursion desired
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_FLAGS_RA = 0x8000 # Recursion available
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_FLAGS_Z = 0x0040 # Zero
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_FLAGS_AD = 0x0020 # Authentic data
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_FLAGS_CD = 0x0010 # Checking disabled
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_CLASS_IN = 1
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_CLASS_CS = 2
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_CLASS_CH = 3
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_CLASS_HS = 4
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_CLASS_NONE = 254
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_CLASS_ANY = 255
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_CLASS_MASK = 0x7FFF
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_CLASS_UNIQUE = 0x8000
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_TYPE_A = 1
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_TYPE_NS = 2
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_TYPE_MD = 3
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_TYPE_MF = 4
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_TYPE_CNAME = 5
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_TYPE_SOA = 6
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_TYPE_MB = 7
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_TYPE_MG = 8
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_TYPE_MR = 9
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_TYPE_NULL = 10
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_TYPE_WKS = 11
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_TYPE_PTR = 12
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_TYPE_HINFO = 13
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_TYPE_MINFO = 14
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_TYPE_MX = 15
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_TYPE_TXT = 16
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_TYPE_AAAA = 28
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_TYPE_SRV = 33
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_TYPE_ANY = 255
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# Mapping constants to names
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_CLASSES = { _CLASS_IN : "in",
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             _CLASS_CS : "cs",
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             _CLASS_CH : "ch",
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             _CLASS_HS : "hs",
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             _CLASS_NONE : "none",
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             _CLASS_ANY : "any" }
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_TYPES = { _TYPE_A : "a",
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           _TYPE_NS : "ns",
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           _TYPE_MD : "md",
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           _TYPE_MF : "mf",
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           _TYPE_CNAME : "cname",
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           _TYPE_SOA : "soa",
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           _TYPE_MB : "mb",
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           _TYPE_MG : "mg",
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           _TYPE_MR : "mr",
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           _TYPE_NULL : "null",
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           _TYPE_WKS : "wks",
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           _TYPE_PTR : "ptr",
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           _TYPE_HINFO : "hinfo",
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           _TYPE_MINFO : "minfo",
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           _TYPE_MX : "mx",
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           _TYPE_TXT : "txt",
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           _TYPE_AAAA : "quada",
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           _TYPE_SRV : "srv",
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           _TYPE_ANY : "any" }
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# utility functions
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def currentTimeMillis():
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    """Current system time in milliseconds"""
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    return time.time() * 1000
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# Exceptions
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class NonLocalNameException(Exception):
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    pass
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class NonUniqueNameException(Exception):
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    pass
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class NamePartTooLongException(Exception):
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    pass
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class AbstractMethodException(Exception):
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    pass
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class BadTypeInNameException(Exception):
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    pass
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class BadDomainName(Exception):
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    def __init__(self, pos):
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        Exception.__init__(self, "at position %s" % pos)
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class BadDomainNameCircular(BadDomainName):
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    pass
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# implementation classes
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class DNSEntry(object):
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    """A DNS entry"""
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    def __init__(self, name, type, clazz):
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        self.key = string.lower(name)
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        self.name = name
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        self.type = type
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        self.clazz = clazz & _CLASS_MASK
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        self.unique = (clazz & _CLASS_UNIQUE) != 0
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    def __eq__(self, other):
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        """Equality test on name, type, and class"""
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        if isinstance(other, DNSEntry):
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            return (self.name == other.name and self.type == other.type and
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                    self.clazz == other.clazz)
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        return 0
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    def __ne__(self, other):
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        """Non-equality test"""
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        return not self.__eq__(other)
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    def getClazz(self, clazz):
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        """Class accessor"""
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        try:
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            return _CLASSES[clazz]
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        except KeyError:
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            return "?(%s)" % (clazz)
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    def getType(self, type):
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        """Type accessor"""
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        try:
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            return _TYPES[type]
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        except KeyError:
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            return "?(%s)" % (type)
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    def toString(self, hdr, other):
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        """String representation with additional information"""
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        result = ("%s[%s,%s" %
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            (hdr, self.getType(self.type), self.getClazz(self.clazz)))
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        if self.unique:
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            result += "-unique,"
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        else:
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            result += ","
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        result += self.name
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        if other is not None:
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            result += ",%s]" % (other)
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        else:
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            result += "]"
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        return result
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class DNSQuestion(DNSEntry):
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    """A DNS question entry"""
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    def __init__(self, name, type, clazz):
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        if not name.endswith(".local."):
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            raise NonLocalNameException(name)
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        DNSEntry.__init__(self, name, type, clazz)
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    def answeredBy(self, rec):
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        """Returns true if the question is answered by the record"""
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        return (self.clazz == rec.clazz and
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                (self.type == rec.type or self.type == _TYPE_ANY) and
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                self.name == rec.name)
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    def __repr__(self):
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        """String representation"""
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        return DNSEntry.toString(self, "question", None)
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class DNSRecord(DNSEntry):
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    """A DNS record - like a DNS entry, but has a TTL"""
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    def __init__(self, name, type, clazz, ttl):
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        DNSEntry.__init__(self, name, type, clazz)
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        self.ttl = ttl
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        self.created = currentTimeMillis()
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    def __eq__(self, other):
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        """Tests equality as per DNSRecord"""
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        if isinstance(other, DNSRecord):
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            return DNSEntry.__eq__(self, other)
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        return 0
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    def suppressedBy(self, msg):
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        """Returns true if any answer in a message can suffice for the
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        information held in this record."""
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        for record in msg.answers:
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            if self.suppressedByAnswer(record):
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                return 1
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        return 0
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    def suppressedByAnswer(self, other):
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        """Returns true if another record has same name, type and class,
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        and if its TTL is at least half of this record's."""
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        if self == other and other.ttl > (self.ttl / 2):
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            return 1
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        return 0
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    def getExpirationTime(self, percent):
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        """Returns the time at which this record will have expired
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        by a certain percentage."""
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        return self.created + (percent * self.ttl * 10)
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    def getRemainingTTL(self, now):
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        """Returns the remaining TTL in seconds."""
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        return max(0, (self.getExpirationTime(100) - now) / 1000)
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    def isExpired(self, now):
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        """Returns true if this record has expired."""
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        return self.getExpirationTime(100) <= now
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    def isStale(self, now):
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        """Returns true if this record is at least half way expired."""
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        return self.getExpirationTime(50) <= now
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    def resetTTL(self, other):
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        """Sets this record's TTL and created time to that of
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        another record."""
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        self.created = other.created
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        self.ttl = other.ttl
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    def write(self, out):
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        """Abstract method"""
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        raise AbstractMethodException
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    def toString(self, other):
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        """String representation with additional information"""
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        arg = ("%s/%s,%s" %
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            (self.ttl, self.getRemainingTTL(currentTimeMillis()), other))
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        return DNSEntry.toString(self, "record", arg)
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class DNSAddress(DNSRecord):
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    """A DNS address record"""
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    def __init__(self, name, type, clazz, ttl, address):
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        DNSRecord.__init__(self, name, type, clazz, ttl)
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        self.address = address
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    def write(self, out):
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        """Used in constructing an outgoing packet"""
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        out.writeString(self.address, len(self.address))
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    def __eq__(self, other):
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        """Tests equality on address"""
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        if isinstance(other, DNSAddress):
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            return self.address == other.address
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        return 0
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    def __repr__(self):
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        """String representation"""
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        try:
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            return socket.inet_ntoa(self.address)
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        except Exception:
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            return self.address
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class DNSHinfo(DNSRecord):
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    """A DNS host information record"""
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    def __init__(self, name, type, clazz, ttl, cpu, os):
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        DNSRecord.__init__(self, name, type, clazz, ttl)
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        self.cpu = cpu
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        self.os = os
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    def write(self, out):
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        """Used in constructing an outgoing packet"""
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        out.writeString(self.cpu, len(self.cpu))
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        out.writeString(self.os, len(self.os))
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    def __eq__(self, other):
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   388
        """Tests equality on cpu and os"""
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   389
        if isinstance(other, DNSHinfo):
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   390
            return self.cpu == other.cpu and self.os == other.os
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   391
        return 0
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   393
    def __repr__(self):
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   394
        """String representation"""
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   395
        return self.cpu + " " + self.os
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   396
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class DNSPointer(DNSRecord):
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   398
    """A DNS pointer record"""
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diff changeset
   399
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    def __init__(self, name, type, clazz, ttl, alias):
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diff changeset
   401
        DNSRecord.__init__(self, name, type, clazz, ttl)
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   402
        self.alias = alias
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   403
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diff changeset
   404
    def write(self, out):
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   405
        """Used in constructing an outgoing packet"""
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   406
        out.writeName(self.alias)
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   407
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   408
    def __eq__(self, other):
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   409
        """Tests equality on alias"""
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   410
        if isinstance(other, DNSPointer):
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   411
            return self.alias == other.alias
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   412
        return 0
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   414
    def __repr__(self):
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   415
        """String representation"""
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   416
        return self.toString(self.alias)
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   417
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   418
class DNSText(DNSRecord):
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   419
    """A DNS text record"""
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   420
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    def __init__(self, name, type, clazz, ttl, text):
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   422
        DNSRecord.__init__(self, name, type, clazz, ttl)
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   423
        self.text = text
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   424
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   425
    def write(self, out):
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   426
        """Used in constructing an outgoing packet"""
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   427
        out.writeString(self.text, len(self.text))
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   428
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diff changeset
   429
    def __eq__(self, other):
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   430
        """Tests equality on text"""
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   431
        if isinstance(other, DNSText):
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   432
            return self.text == other.text
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   433
        return 0
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   435
    def __repr__(self):
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   436
        """String representation"""
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diff changeset
   437
        if len(self.text) > 10:
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   438
            return self.toString(self.text[:7] + "...")
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   439
        else:
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   440
            return self.toString(self.text)
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class DNSService(DNSRecord):
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    """A DNS service record"""
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diff changeset
   444
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   445
    def __init__(self, name, type, clazz, ttl, priority, weight, port, server):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   446
        DNSRecord.__init__(self, name, type, clazz, ttl)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   447
        self.priority = priority
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   448
        self.weight = weight
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   449
        self.port = port
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   450
        self.server = server
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   451
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   452
    def write(self, out):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   453
        """Used in constructing an outgoing packet"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   454
        out.writeShort(self.priority)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   455
        out.writeShort(self.weight)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   456
        out.writeShort(self.port)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   457
        out.writeName(self.server)
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   458
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   459
    def __eq__(self, other):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   460
        """Tests equality on priority, weight, port and server"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   461
        if isinstance(other, DNSService):
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
   462
            return (self.priority == other.priority and
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
   463
                    self.weight == other.weight and
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
   464
                    self.port == other.port and
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
   465
                    self.server == other.server)
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   466
        return 0
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   467
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   468
    def __repr__(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   469
        """String representation"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   470
        return self.toString("%s:%s" % (self.server, self.port))
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   471
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   472
class DNSIncoming(object):
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   473
    """Object representation of an incoming DNS packet"""
7877
eba7f12b0c51 cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7874
diff changeset
   474
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   475
    def __init__(self, data):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   476
        """Constructor from string holding bytes of packet"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   477
        self.offset = 0
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   478
        self.data = data
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   479
        self.questions = []
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   480
        self.answers = []
28419
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
   481
        self.numquestions = 0
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
   482
        self.numanswers = 0
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
   483
        self.numauthorities = 0
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
   484
        self.numadditionals = 0
7877
eba7f12b0c51 cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7874
diff changeset
   485
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   486
        self.readHeader()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   487
        self.readQuestions()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   488
        self.readOthers()
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   489
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   490
    def readHeader(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   491
        """Reads header portion of packet"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   492
        format = '!HHHHHH'
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   493
        length = struct.calcsize(format)
28300
15c5f50e7e13 zeroconf: add whitespace around operator
timeless <timeless@mozdev.org>
parents: 28299
diff changeset
   494
        info = struct.unpack(format,
15c5f50e7e13 zeroconf: add whitespace around operator
timeless <timeless@mozdev.org>
parents: 28299
diff changeset
   495
                             self.data[self.offset:self.offset + length])
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   496
        self.offset += length
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   497
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   498
        self.id = info[0]
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   499
        self.flags = info[1]
28419
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
   500
        self.numquestions = info[2]
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
   501
        self.numanswers = info[3]
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
   502
        self.numauthorities = info[4]
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
   503
        self.numadditionals = info[5]
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   504
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   505
    def readQuestions(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   506
        """Reads questions section of packet"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   507
        format = '!HH'
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   508
        length = struct.calcsize(format)
28419
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
   509
        for i in range(0, self.numquestions):
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   510
            name = self.readName()
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
   511
            info = struct.unpack(format,
28300
15c5f50e7e13 zeroconf: add whitespace around operator
timeless <timeless@mozdev.org>
parents: 28299
diff changeset
   512
                                 self.data[self.offset:self.offset + length])
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   513
            self.offset += length
7877
eba7f12b0c51 cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7874
diff changeset
   514
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   515
            try:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   516
                question = DNSQuestion(name, info[0], info[1])
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   517
                self.questions.append(question)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   518
            except NonLocalNameException:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   519
                pass
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   520
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   521
    def readInt(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   522
        """Reads an integer from the packet"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   523
        format = '!I'
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   524
        length = struct.calcsize(format)
28300
15c5f50e7e13 zeroconf: add whitespace around operator
timeless <timeless@mozdev.org>
parents: 28299
diff changeset
   525
        info = struct.unpack(format,
15c5f50e7e13 zeroconf: add whitespace around operator
timeless <timeless@mozdev.org>
parents: 28299
diff changeset
   526
                             self.data[self.offset:self.offset + length])
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   527
        self.offset += length
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   528
        return info[0]
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   529
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   530
    def readCharacterString(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   531
        """Reads a character string from the packet"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   532
        length = ord(self.data[self.offset])
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   533
        self.offset += 1
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   534
        return self.readString(length)
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   535
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   536
    def readString(self, len):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   537
        """Reads a string of a given length from the packet"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   538
        format = '!' + str(len) + 's'
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   539
        length = struct.calcsize(format)
28300
15c5f50e7e13 zeroconf: add whitespace around operator
timeless <timeless@mozdev.org>
parents: 28299
diff changeset
   540
        info = struct.unpack(format,
15c5f50e7e13 zeroconf: add whitespace around operator
timeless <timeless@mozdev.org>
parents: 28299
diff changeset
   541
                             self.data[self.offset:self.offset + length])
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   542
        self.offset += length
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   543
        return info[0]
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   544
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   545
    def readUnsignedShort(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   546
        """Reads an unsigned short from the packet"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   547
        format = '!H'
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   548
        length = struct.calcsize(format)
28300
15c5f50e7e13 zeroconf: add whitespace around operator
timeless <timeless@mozdev.org>
parents: 28299
diff changeset
   549
        info = struct.unpack(format,
15c5f50e7e13 zeroconf: add whitespace around operator
timeless <timeless@mozdev.org>
parents: 28299
diff changeset
   550
                             self.data[self.offset:self.offset + length])
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   551
        self.offset += length
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   552
        return info[0]
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   553
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   554
    def readOthers(self):
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
   555
        """Reads answers, authorities and additionals section of the packet"""
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   556
        format = '!HHiH'
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   557
        length = struct.calcsize(format)
28504
3c90090320ad zeroconf: remove leftover camelcase identifier
Martin von Zweigbergk <martinvonz@google.com>
parents: 28422
diff changeset
   558
        n = self.numanswers + self.numauthorities + self.numadditionals
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   559
        for i in range(0, n):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   560
            domain = self.readName()
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
   561
            info = struct.unpack(format,
28300
15c5f50e7e13 zeroconf: add whitespace around operator
timeless <timeless@mozdev.org>
parents: 28299
diff changeset
   562
                                 self.data[self.offset:self.offset + length])
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   563
            self.offset += length
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   564
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   565
            rec = None
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   566
            if info[0] == _TYPE_A:
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
   567
                rec = DNSAddress(domain, info[0], info[1], info[2],
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
   568
                                 self.readString(4))
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   569
            elif info[0] == _TYPE_CNAME or info[0] == _TYPE_PTR:
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
   570
                rec = DNSPointer(domain, info[0], info[1], info[2],
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
   571
                                 self.readName())
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   572
            elif info[0] == _TYPE_TXT:
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
   573
                rec = DNSText(domain, info[0], info[1], info[2],
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
   574
                              self.readString(info[3]))
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   575
            elif info[0] == _TYPE_SRV:
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
   576
                rec = DNSService(domain, info[0], info[1], info[2],
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
   577
                                 self.readUnsignedShort(),
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
   578
                                 self.readUnsignedShort(),
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
   579
                                 self.readUnsignedShort(),
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
   580
                                 self.readName())
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   581
            elif info[0] == _TYPE_HINFO:
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
   582
                rec = DNSHinfo(domain, info[0], info[1], info[2],
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
   583
                               self.readCharacterString(),
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
   584
                               self.readCharacterString())
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   585
            elif info[0] == _TYPE_AAAA:
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
   586
                rec = DNSAddress(domain, info[0], info[1], info[2],
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
   587
                                 self.readString(16))
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   588
            else:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   589
                # Try to ignore types we don't know about
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   590
                # this may mean the rest of the name is
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   591
                # unable to be parsed, and may show errors
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   592
                # so this is left for debugging.  New types
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   593
                # encountered need to be parsed properly.
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   594
                #
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   595
                #print "UNKNOWN TYPE = " + str(info[0])
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   596
                #raise BadTypeInNameException
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   597
                self.offset += info[3]
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   598
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   599
            if rec is not None:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   600
                self.answers.append(rec)
7877
eba7f12b0c51 cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7874
diff changeset
   601
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   602
    def isQuery(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   603
        """Returns true if this is a query"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   604
        return (self.flags & _FLAGS_QR_MASK) == _FLAGS_QR_QUERY
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   605
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   606
    def isResponse(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   607
        """Returns true if this is a response"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   608
        return (self.flags & _FLAGS_QR_MASK) == _FLAGS_QR_RESPONSE
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   609
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   610
    def readUTF(self, offset, len):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   611
        """Reads a UTF-8 string of a given length from the packet"""
28300
15c5f50e7e13 zeroconf: add whitespace around operator
timeless <timeless@mozdev.org>
parents: 28299
diff changeset
   612
        return self.data[offset:offset + len].decode('utf-8')
7877
eba7f12b0c51 cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7874
diff changeset
   613
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   614
    def readName(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   615
        """Reads a domain name from the packet"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   616
        result = ''
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   617
        off = self.offset
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   618
        next = -1
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   619
        first = off
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   620
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   621
        while True:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   622
            len = ord(self.data[off])
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   623
            off += 1
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   624
            if len == 0:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   625
                break
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   626
            t = len & 0xC0
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   627
            if t == 0x00:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   628
                result = ''.join((result, self.readUTF(off, len) + '.'))
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   629
                off += len
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   630
            elif t == 0xC0:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   631
                if next < 0:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   632
                    next = off + 1
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   633
                off = ((len & 0x3F) << 8) | ord(self.data[off])
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   634
                if off >= first:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   635
                    raise BadDomainNameCircular(off)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   636
                first = off
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   637
            else:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   638
                raise BadDomainName(off)
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   639
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   640
        if next >= 0:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   641
            self.offset = next
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   642
        else:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   643
            self.offset = off
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   644
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   645
        return result
7877
eba7f12b0c51 cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7874
diff changeset
   646
eba7f12b0c51 cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7874
diff changeset
   647
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   648
class DNSOutgoing(object):
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   649
    """Object representation of an outgoing packet"""
7877
eba7f12b0c51 cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7874
diff changeset
   650
28302
e96a3ae025ed zeroconf: remove whitespace around = for named parameters
timeless <timeless@mozdev.org>
parents: 28301
diff changeset
   651
    def __init__(self, flags, multicast=1):
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   652
        self.finished = 0
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   653
        self.id = 0
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   654
        self.multicast = multicast
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   655
        self.flags = flags
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   656
        self.names = {}
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   657
        self.data = []
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   658
        self.size = 12
7877
eba7f12b0c51 cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7874
diff changeset
   659
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   660
        self.questions = []
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   661
        self.answers = []
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   662
        self.authorities = []
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   663
        self.additionals = []
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   664
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   665
    def addQuestion(self, record):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   666
        """Adds a question"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   667
        self.questions.append(record)
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   668
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   669
    def addAnswer(self, inp, record):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   670
        """Adds an answer"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   671
        if not record.suppressedBy(inp):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   672
            self.addAnswerAtTime(record, 0)
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   673
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   674
    def addAnswerAtTime(self, record, now):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   675
        """Adds an answer if if does not expire by a certain time"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   676
        if record is not None:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   677
            if now == 0 or not record.isExpired(now):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   678
                self.answers.append((record, now))
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   679
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   680
    def addAuthoritativeAnswer(self, record):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   681
        """Adds an authoritative answer"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   682
        self.authorities.append(record)
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   683
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   684
    def addAdditionalAnswer(self, record):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   685
        """Adds an additional answer"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   686
        self.additionals.append(record)
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   687
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   688
    def writeByte(self, value):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   689
        """Writes a single byte to the packet"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   690
        format = '!c'
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   691
        self.data.append(struct.pack(format, chr(value)))
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   692
        self.size += 1
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   693
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   694
    def insertShort(self, index, value):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   695
        """Inserts an unsigned short in a certain position in the packet"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   696
        format = '!H'
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   697
        self.data.insert(index, struct.pack(format, value))
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   698
        self.size += 2
7877
eba7f12b0c51 cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7874
diff changeset
   699
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   700
    def writeShort(self, value):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   701
        """Writes an unsigned short to the packet"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   702
        format = '!H'
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   703
        self.data.append(struct.pack(format, value))
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   704
        self.size += 2
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   705
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   706
    def writeInt(self, value):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   707
        """Writes an unsigned integer to the packet"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   708
        format = '!I'
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   709
        self.data.append(struct.pack(format, int(value)))
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   710
        self.size += 4
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   711
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   712
    def writeString(self, value, length):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   713
        """Writes a string to the packet"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   714
        format = '!' + str(length) + 's'
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   715
        self.data.append(struct.pack(format, value))
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   716
        self.size += length
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   717
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   718
    def writeUTF(self, s):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   719
        """Writes a UTF-8 string of a given length to the packet"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   720
        utfstr = s.encode('utf-8')
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   721
        length = len(utfstr)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   722
        if length > 64:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   723
            raise NamePartTooLongException
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   724
        self.writeByte(length)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   725
        self.writeString(utfstr, length)
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   726
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   727
    def writeName(self, name):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   728
        """Writes a domain name to the packet"""
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   729
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   730
        try:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   731
            # Find existing instance of this name in packet
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   732
            #
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   733
            index = self.names[name]
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   734
        except KeyError:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   735
            # No record of this name already, so write it
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   736
            # out as normal, recording the location of the name
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   737
            # for future pointers to it.
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   738
            #
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   739
            self.names[name] = self.size
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   740
            parts = name.split('.')
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   741
            if parts[-1] == '':
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   742
                parts = parts[:-1]
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   743
            for part in parts:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   744
                self.writeUTF(part)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   745
            self.writeByte(0)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   746
            return
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   747
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   748
        # An index was found, so write a pointer to it
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   749
        #
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   750
        self.writeByte((index >> 8) | 0xC0)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   751
        self.writeByte(index)
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   752
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   753
    def writeQuestion(self, question):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   754
        """Writes a question to the packet"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   755
        self.writeName(question.name)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   756
        self.writeShort(question.type)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   757
        self.writeShort(question.clazz)
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   758
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   759
    def writeRecord(self, record, now):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   760
        """Writes a record (answer, authoritative answer, additional) to
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   761
        the packet"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   762
        self.writeName(record.name)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   763
        self.writeShort(record.type)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   764
        if record.unique and self.multicast:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   765
            self.writeShort(record.clazz | _CLASS_UNIQUE)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   766
        else:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   767
            self.writeShort(record.clazz)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   768
        if now == 0:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   769
            self.writeInt(record.ttl)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   770
        else:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   771
            self.writeInt(record.getRemainingTTL(now))
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   772
        index = len(self.data)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   773
        # Adjust size for the short we will write before this record
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   774
        #
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   775
        self.size += 2
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   776
        record.write(self)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   777
        self.size -= 2
7877
eba7f12b0c51 cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7874
diff changeset
   778
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   779
        length = len(''.join(self.data[index:]))
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   780
        self.insertShort(index, length) # Here is the short we adjusted for
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   781
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   782
    def packet(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   783
        """Returns a string containing the packet's bytes
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   784
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   785
        No further parts should be added to the packet once this
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   786
        is done."""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   787
        if not self.finished:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   788
            self.finished = 1
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   789
            for question in self.questions:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   790
                self.writeQuestion(question)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   791
            for answer, time_ in self.answers:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   792
                self.writeRecord(answer, time_)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   793
            for authority in self.authorities:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   794
                self.writeRecord(authority, 0)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   795
            for additional in self.additionals:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   796
                self.writeRecord(additional, 0)
7877
eba7f12b0c51 cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7874
diff changeset
   797
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   798
            self.insertShort(0, len(self.additionals))
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   799
            self.insertShort(0, len(self.authorities))
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   800
            self.insertShort(0, len(self.answers))
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   801
            self.insertShort(0, len(self.questions))
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   802
            self.insertShort(0, self.flags)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   803
            if self.multicast:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   804
                self.insertShort(0, 0)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   805
            else:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   806
                self.insertShort(0, self.id)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   807
        return ''.join(self.data)
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   808
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   809
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   810
class DNSCache(object):
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   811
    """A cache of DNS entries"""
7877
eba7f12b0c51 cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7874
diff changeset
   812
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   813
    def __init__(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   814
        self.cache = {}
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   815
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   816
    def add(self, entry):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   817
        """Adds an entry"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   818
        try:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   819
            list = self.cache[entry.key]
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   820
        except KeyError:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   821
            list = self.cache[entry.key] = []
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   822
        list.append(entry)
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   823
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   824
    def remove(self, entry):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   825
        """Removes an entry"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   826
        try:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   827
            list = self.cache[entry.key]
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   828
            list.remove(entry)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   829
        except KeyError:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   830
            pass
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   831
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   832
    def get(self, entry):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   833
        """Gets an entry by key.  Will return None if there is no
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   834
        matching entry."""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   835
        try:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   836
            list = self.cache[entry.key]
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   837
            return list[list.index(entry)]
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   838
        except (KeyError, ValueError):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   839
            return None
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   840
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   841
    def getByDetails(self, name, type, clazz):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   842
        """Gets an entry by details.  Will return None if there is
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   843
        no matching entry."""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   844
        entry = DNSEntry(name, type, clazz)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   845
        return self.get(entry)
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   846
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   847
    def entriesWithName(self, name):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   848
        """Returns a list of entries whose key matches the name."""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   849
        try:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   850
            return self.cache[name]
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   851
        except KeyError:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   852
            return []
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   853
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   854
    def entries(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   855
        """Returns a list of all entries"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   856
        try:
28422
e2c6092ad422 zeroconf: replace reduce+add with itertools.chain
timeless <timeless@mozdev.org>
parents: 28421
diff changeset
   857
            return list(itertools.chain.from_iterable(self.cache.values()))
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   858
        except Exception:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   859
            return []
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   860
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   861
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   862
class Engine(threading.Thread):
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   863
    """An engine wraps read access to sockets, allowing objects that
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   864
    need to receive data from sockets to be called back when the
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   865
    sockets are ready.
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   866
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   867
    A reader needs a handle_read() method, which is called when the socket
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   868
    it is interested in is ready for reading.
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   869
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   870
    Writers are not implemented here, because we only send short
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   871
    packets.
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   872
    """
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   873
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   874
    def __init__(self, zeroconf):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   875
        threading.Thread.__init__(self)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   876
        self.zeroconf = zeroconf
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   877
        self.readers = {} # maps socket to reader
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   878
        self.timeout = 5
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   879
        self.condition = threading.Condition()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   880
        self.start()
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   881
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   882
    def run(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   883
        while not globals()['_GLOBAL_DONE']:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   884
            rs = self.getReaders()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   885
            if len(rs) == 0:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   886
                # No sockets to manage, but we wait for the timeout
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   887
                # or addition of a socket
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   888
                #
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   889
                self.condition.acquire()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   890
                self.condition.wait(self.timeout)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   891
                self.condition.release()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   892
            else:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   893
                try:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   894
                    rr, wr, er = select.select(rs, [], [], self.timeout)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   895
                    for sock in rr:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   896
                        try:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   897
                            self.readers[sock].handle_read()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   898
                        except Exception:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   899
                            if not globals()['_GLOBAL_DONE']:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   900
                                traceback.print_exc()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   901
                except Exception:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   902
                    pass
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   903
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   904
    def getReaders(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   905
        self.condition.acquire()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   906
        result = self.readers.keys()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   907
        self.condition.release()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   908
        return result
7877
eba7f12b0c51 cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7874
diff changeset
   909
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   910
    def addReader(self, reader, socket):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   911
        self.condition.acquire()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   912
        self.readers[socket] = reader
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   913
        self.condition.notify()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   914
        self.condition.release()
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   915
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   916
    def delReader(self, socket):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   917
        self.condition.acquire()
28301
fd8a4d2d6541 zeroconf: del is not a function
timeless <timeless@mozdev.org>
parents: 28300
diff changeset
   918
        del self.readers[socket]
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   919
        self.condition.notify()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   920
        self.condition.release()
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   921
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   922
    def notify(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   923
        self.condition.acquire()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   924
        self.condition.notify()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   925
        self.condition.release()
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   926
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   927
class Listener(object):
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   928
    """A Listener is used by this module to listen on the multicast
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   929
    group to which DNS messages are sent, allowing the implementation
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   930
    to cache information as it arrives.
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   931
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   932
    It requires registration with an Engine object in order to have
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   933
    the read() method called when a socket is available for reading."""
7877
eba7f12b0c51 cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7874
diff changeset
   934
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   935
    def __init__(self, zeroconf):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   936
        self.zeroconf = zeroconf
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   937
        self.zeroconf.engine.addReader(self, self.zeroconf.socket)
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   938
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   939
    def handle_read(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   940
        data, (addr, port) = self.zeroconf.socket.recvfrom(_MAX_MSG_ABSOLUTE)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   941
        self.data = data
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   942
        msg = DNSIncoming(data)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   943
        if msg.isQuery():
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   944
            # Always multicast responses
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   945
            #
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   946
            if port == _MDNS_PORT:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   947
                self.zeroconf.handleQuery(msg, _MDNS_ADDR, _MDNS_PORT)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   948
            # If it's not a multicast query, reply via unicast
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   949
            # and multicast
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   950
            #
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   951
            elif port == _DNS_PORT:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   952
                self.zeroconf.handleQuery(msg, addr, port)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   953
                self.zeroconf.handleQuery(msg, _MDNS_ADDR, _MDNS_PORT)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   954
        else:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   955
            self.zeroconf.handleResponse(msg)
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   956
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   957
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   958
class Reaper(threading.Thread):
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   959
    """A Reaper is used by this module to remove cache entries that
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   960
    have expired."""
7877
eba7f12b0c51 cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7874
diff changeset
   961
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   962
    def __init__(self, zeroconf):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   963
        threading.Thread.__init__(self)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   964
        self.zeroconf = zeroconf
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   965
        self.start()
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   966
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   967
    def run(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   968
        while True:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   969
            self.zeroconf.wait(10 * 1000)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   970
            if globals()['_GLOBAL_DONE']:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   971
                return
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   972
            now = currentTimeMillis()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   973
            for record in self.zeroconf.cache.entries():
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   974
                if record.isExpired(now):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   975
                    self.zeroconf.updateRecord(now, record)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   976
                    self.zeroconf.cache.remove(record)
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   977
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   978
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   979
class ServiceBrowser(threading.Thread):
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   980
    """Used to browse for a service of a specific type.
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   981
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   982
    The listener object will have its addService() and
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   983
    removeService() methods called when this browser
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   984
    discovers changes in the services availability."""
7877
eba7f12b0c51 cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7874
diff changeset
   985
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   986
    def __init__(self, zeroconf, type, listener):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   987
        """Creates a browser for a specific type"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   988
        threading.Thread.__init__(self)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   989
        self.zeroconf = zeroconf
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   990
        self.type = type
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   991
        self.listener = listener
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   992
        self.services = {}
28419
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
   993
        self.nexttime = currentTimeMillis()
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   994
        self.delay = _BROWSER_TIME
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   995
        self.list = []
7877
eba7f12b0c51 cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7874
diff changeset
   996
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
   997
        self.done = 0
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
   998
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
   999
        self.zeroconf.addListener(self, DNSQuestion(self.type, _TYPE_PTR,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1000
                                                    _CLASS_IN))
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1001
        self.start()
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1002
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1003
    def updateRecord(self, zeroconf, now, record):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1004
        """Callback invoked by Zeroconf when new information arrives.
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1005
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1006
        Updates information required by browser in the Zeroconf cache."""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1007
        if record.type == _TYPE_PTR and record.name == self.type:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1008
            expired = record.isExpired(now)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1009
            try:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1010
                oldrecord = self.services[record.alias.lower()]
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1011
                if not expired:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1012
                    oldrecord.resetTTL(record)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1013
                else:
28301
fd8a4d2d6541 zeroconf: del is not a function
timeless <timeless@mozdev.org>
parents: 28300
diff changeset
  1014
                    del self.services[record.alias.lower()]
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1015
                    callback = (lambda x:
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1016
                        self.listener.removeService(x, self.type, record.alias))
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1017
                    self.list.append(callback)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1018
                    return
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1019
            except Exception:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1020
                if not expired:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1021
                    self.services[record.alias.lower()] = record
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1022
                    callback = (lambda x:
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1023
                        self.listener.addService(x, self.type, record.alias))
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1024
                    self.list.append(callback)
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1025
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1026
            expires = record.getExpirationTime(75)
28419
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
  1027
            if expires < self.nexttime:
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
  1028
                self.nexttime = expires
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1029
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1030
    def cancel(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1031
        self.done = 1
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1032
        self.zeroconf.notifyAll()
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1033
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1034
    def run(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1035
        while True:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1036
            event = None
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1037
            now = currentTimeMillis()
28419
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
  1038
            if len(self.list) == 0 and self.nexttime > now:
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
  1039
                self.zeroconf.wait(self.nexttime - now)
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1040
            if globals()['_GLOBAL_DONE'] or self.done:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1041
                return
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1042
            now = currentTimeMillis()
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1043
28419
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
  1044
            if self.nexttime <= now:
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1045
                out = DNSOutgoing(_FLAGS_QR_QUERY)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1046
                out.addQuestion(DNSQuestion(self.type, _TYPE_PTR, _CLASS_IN))
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1047
                for record in self.services.values():
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1048
                    if not record.isExpired(now):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1049
                        out.addAnswerAtTime(record, now)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1050
                self.zeroconf.send(out)
28419
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
  1051
                self.nexttime = now + self.delay
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1052
                self.delay = min(20 * 1000, self.delay * 2)
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1053
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1054
            if len(self.list) > 0:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1055
                event = self.list.pop(0)
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1056
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1057
            if event is not None:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1058
                event(self.zeroconf)
7877
eba7f12b0c51 cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7874
diff changeset
  1059
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1060
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1061
class ServiceInfo(object):
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1062
    """Service information"""
7877
eba7f12b0c51 cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7874
diff changeset
  1063
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1064
    def __init__(self, type, name, address=None, port=None, weight=0,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1065
                 priority=0, properties=None, server=None):
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1066
        """Create a service description.
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1067
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1068
        type: fully qualified service type name
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1069
        name: fully qualified service name
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1070
        address: IP address as unsigned short, network byte order
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1071
        port: port that the service runs on
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1072
        weight: weight of the service
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1073
        priority: priority of the service
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1074
        properties: dictionary of properties (or a string holding the bytes for
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1075
                    the text field)
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1076
        server: fully qualified name for service host (defaults to name)"""
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1077
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1078
        if not name.endswith(type):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1079
            raise BadTypeInNameException
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1080
        self.type = type
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1081
        self.name = name
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1082
        self.address = address
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1083
        self.port = port
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1084
        self.weight = weight
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1085
        self.priority = priority
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1086
        if server:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1087
            self.server = server
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1088
        else:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1089
            self.server = name
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1090
        self.setProperties(properties)
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1091
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1092
    def setProperties(self, properties):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1093
        """Sets properties and text of this info from a dictionary"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1094
        if isinstance(properties, dict):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1095
            self.properties = properties
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1096
            list = []
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1097
            result = ''
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1098
            for key in properties:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1099
                value = properties[key]
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1100
                if value is None:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1101
                    suffix = ''
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1102
                elif isinstance(value, str):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1103
                    suffix = value
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1104
                elif isinstance(value, int):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1105
                    if value:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1106
                        suffix = 'true'
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1107
                    else:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1108
                        suffix = 'false'
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1109
                else:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1110
                    suffix = ''
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1111
                list.append('='.join((key, suffix)))
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1112
            for item in list:
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1113
                result = ''.join((result, struct.pack('!c', chr(len(item))),
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1114
                                  item))
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1115
            self.text = result
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1116
        else:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1117
            self.text = properties
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1118
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1119
    def setText(self, text):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1120
        """Sets properties and text given a text field"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1121
        self.text = text
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1122
        try:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1123
            result = {}
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1124
            end = len(text)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1125
            index = 0
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1126
            strs = []
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1127
            while index < end:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1128
                length = ord(text[index])
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1129
                index += 1
28300
15c5f50e7e13 zeroconf: add whitespace around operator
timeless <timeless@mozdev.org>
parents: 28299
diff changeset
  1130
                strs.append(text[index:index + length])
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1131
                index += length
7877
eba7f12b0c51 cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7874
diff changeset
  1132
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1133
            for s in strs:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1134
                eindex = s.find('=')
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1135
                if eindex == -1:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1136
                    # No equals sign at all
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1137
                    key = s
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1138
                    value = 0
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1139
                else:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1140
                    key = s[:eindex]
28300
15c5f50e7e13 zeroconf: add whitespace around operator
timeless <timeless@mozdev.org>
parents: 28299
diff changeset
  1141
                    value = s[eindex + 1:]
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1142
                    if value == 'true':
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1143
                        value = 1
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1144
                    elif value == 'false' or not value:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1145
                        value = 0
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1146
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1147
                # Only update non-existent properties
28420
d03b7800672c zeroconf: compare singleton using is
timeless <timeless@mozdev.org>
parents: 28419
diff changeset
  1148
                if key and result.get(key) is None:
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1149
                    result[key] = value
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1150
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1151
            self.properties = result
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1152
        except Exception:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1153
            traceback.print_exc()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1154
            self.properties = None
7877
eba7f12b0c51 cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7874
diff changeset
  1155
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1156
    def getType(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1157
        """Type accessor"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1158
        return self.type
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1159
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1160
    def getName(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1161
        """Name accessor"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1162
        if self.type is not None and self.name.endswith("." + self.type):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1163
            return self.name[:len(self.name) - len(self.type) - 1]
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1164
        return self.name
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1165
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1166
    def getAddress(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1167
        """Address accessor"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1168
        return self.address
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1169
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1170
    def getPort(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1171
        """Port accessor"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1172
        return self.port
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1173
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1174
    def getPriority(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1175
        """Priority accessor"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1176
        return self.priority
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1177
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1178
    def getWeight(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1179
        """Weight accessor"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1180
        return self.weight
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1181
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1182
    def getProperties(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1183
        """Properties accessor"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1184
        return self.properties
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1185
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1186
    def getText(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1187
        """Text accessor"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1188
        return self.text
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1189
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1190
    def getServer(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1191
        """Server accessor"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1192
        return self.server
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1193
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1194
    def updateRecord(self, zeroconf, now, record):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1195
        """Updates service information from a DNS record"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1196
        if record is not None and not record.isExpired(now):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1197
            if record.type == _TYPE_A:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1198
                #if record.name == self.name:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1199
                if record.name == self.server:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1200
                    self.address = record.address
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1201
            elif record.type == _TYPE_SRV:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1202
                if record.name == self.name:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1203
                    self.server = record.server
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1204
                    self.port = record.port
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1205
                    self.weight = record.weight
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1206
                    self.priority = record.priority
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1207
                    #self.address = None
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1208
                    self.updateRecord(zeroconf, now,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1209
                                      zeroconf.cache.getByDetails(self.server,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1210
                                      _TYPE_A, _CLASS_IN))
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1211
            elif record.type == _TYPE_TXT:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1212
                if record.name == self.name:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1213
                    self.setText(record.text)
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1214
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1215
    def request(self, zeroconf, timeout):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1216
        """Returns true if the service could be discovered on the
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1217
        network, and updates this object with details discovered.
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1218
        """
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1219
        now = currentTimeMillis()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1220
        delay = _LISTENER_TIME
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1221
        next = now + delay
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1222
        last = now + timeout
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1223
        result = 0
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1224
        try:
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1225
            zeroconf.addListener(self, DNSQuestion(self.name, _TYPE_ANY,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1226
                                                   _CLASS_IN))
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1227
            while (self.server is None or self.address is None or
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1228
                   self.text is None):
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1229
                if last <= now:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1230
                    return 0
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1231
                if next <= now:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1232
                    out = DNSOutgoing(_FLAGS_QR_QUERY)
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1233
                    out.addQuestion(DNSQuestion(self.name, _TYPE_SRV,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1234
                                                _CLASS_IN))
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1235
                    out.addAnswerAtTime(
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1236
                        zeroconf.cache.getByDetails(self.name,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1237
                                                    _TYPE_SRV,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1238
                                                    _CLASS_IN),
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1239
                                        now)
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1240
                    out.addQuestion(DNSQuestion(self.name, _TYPE_TXT,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1241
                                                _CLASS_IN))
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1242
                    out.addAnswerAtTime(
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1243
                        zeroconf.cache.getByDetails(self.name, _TYPE_TXT,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1244
                                                    _CLASS_IN),
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1245
                                        now)
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1246
                    if self.server is not None:
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1247
                        out.addQuestion(
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1248
                            DNSQuestion(self.server, _TYPE_A, _CLASS_IN))
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1249
                        out.addAnswerAtTime(
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1250
                            zeroconf.cache.getByDetails(self.server, _TYPE_A,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1251
                                                        _CLASS_IN),
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1252
                                            now)
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1253
                    zeroconf.send(out)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1254
                    next = now + delay
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1255
                    delay = delay * 2
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1256
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1257
                zeroconf.wait(min(next, last) - now)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1258
                now = currentTimeMillis()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1259
            result = 1
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1260
        finally:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1261
            zeroconf.removeListener(self)
7877
eba7f12b0c51 cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7874
diff changeset
  1262
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1263
        return result
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1264
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1265
    def __eq__(self, other):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1266
        """Tests equality of service name"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1267
        if isinstance(other, ServiceInfo):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1268
            return other.name == self.name
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1269
        return 0
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1270
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1271
    def __ne__(self, other):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1272
        """Non-equality test"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1273
        return not self.__eq__(other)
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1274
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1275
    def __repr__(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1276
        """String representation"""
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1277
        result = ("service[%s,%s:%s," %
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1278
            (self.name, socket.inet_ntoa(self.getAddress()), self.port))
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1279
        if self.text is None:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1280
            result += "None"
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1281
        else:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1282
            if len(self.text) < 20:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1283
                result += self.text
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1284
            else:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1285
                result += self.text[:17] + "..."
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1286
        result += "]"
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1287
        return result
7877
eba7f12b0c51 cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7874
diff changeset
  1288
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1289
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1290
class Zeroconf(object):
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1291
    """Implementation of Zeroconf Multicast DNS Service Discovery
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1292
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1293
    Supports registration, unregistration, queries and browsing.
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1294
    """
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1295
    def __init__(self, bindaddress=None):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1296
        """Creates an instance of the Zeroconf class, establishing
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1297
        multicast communications, listening and reaping threads."""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1298
        globals()['_GLOBAL_DONE'] = 0
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1299
        if bindaddress is None:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1300
            self.intf = socket.gethostbyname(socket.gethostname())
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1301
        else:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1302
            self.intf = bindaddress
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1303
        self.group = ('', _MDNS_PORT)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1304
        self.socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1305
        try:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1306
            self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1307
            self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1308
        except Exception:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1309
            # SO_REUSEADDR should be equivalent to SO_REUSEPORT for
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1310
            # multicast UDP sockets (p 731, "TCP/IP Illustrated,
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1311
            # Volume 2"), but some BSD-derived systems require
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1312
            # SO_REUSEPORT to be specified explicitly.  Also, not all
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1313
            # versions of Python have SO_REUSEPORT available.  So
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1314
            # if you're on a BSD-based system, and haven't upgraded
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1315
            # to Python 2.3 yet, you may find this library doesn't
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1316
            # work as expected.
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1317
            #
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1318
            pass
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1319
        self.socket.setsockopt(socket.SOL_IP, socket.IP_MULTICAST_TTL, "\xff")
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1320
        self.socket.setsockopt(socket.SOL_IP, socket.IP_MULTICAST_LOOP, "\x01")
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1321
        try:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1322
            self.socket.bind(self.group)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1323
        except Exception:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1324
            # Some versions of linux raise an exception even though
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1325
            # SO_REUSEADDR and SO_REUSEPORT have been set, so ignore it
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1326
            pass
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1327
        self.socket.setsockopt(socket.SOL_IP, socket.IP_ADD_MEMBERSHIP,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1328
            socket.inet_aton(_MDNS_ADDR) + socket.inet_aton('0.0.0.0'))
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1329
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1330
        self.listeners = []
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1331
        self.browsers = []
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1332
        self.services = {}
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1333
        self.servicetypes = {}
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1334
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1335
        self.cache = DNSCache()
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1336
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1337
        self.condition = threading.Condition()
7877
eba7f12b0c51 cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7874
diff changeset
  1338
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1339
        self.engine = Engine(self)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1340
        self.listener = Listener(self)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1341
        self.reaper = Reaper(self)
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1342
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1343
    def isLoopback(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1344
        return self.intf.startswith("127.0.0.1")
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1345
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1346
    def isLinklocal(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1347
        return self.intf.startswith("169.254.")
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1348
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1349
    def wait(self, timeout):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1350
        """Calling thread waits for a given number of milliseconds or
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1351
        until notified."""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1352
        self.condition.acquire()
28300
15c5f50e7e13 zeroconf: add whitespace around operator
timeless <timeless@mozdev.org>
parents: 28299
diff changeset
  1353
        self.condition.wait(timeout / 1000)
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1354
        self.condition.release()
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1355
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1356
    def notifyAll(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1357
        """Notifies all waiting threads"""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1358
        self.condition.acquire()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1359
        self.condition.notifyAll()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1360
        self.condition.release()
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1361
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1362
    def getServiceInfo(self, type, name, timeout=3000):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1363
        """Returns network's service information for a particular
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1364
        name and type, or None if no service matches by the timeout,
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1365
        which defaults to 3 seconds."""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1366
        info = ServiceInfo(type, name)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1367
        if info.request(self, timeout):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1368
            return info
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1369
        return None
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1370
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1371
    def addServiceListener(self, type, listener):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1372
        """Adds a listener for a particular service type.  This object
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1373
        will then have its updateRecord method called when information
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1374
        arrives for that type."""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1375
        self.removeServiceListener(listener)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1376
        self.browsers.append(ServiceBrowser(self, type, listener))
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1377
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1378
    def removeServiceListener(self, listener):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1379
        """Removes a listener from the set that is currently listening."""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1380
        for browser in self.browsers:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1381
            if browser.listener == listener:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1382
                browser.cancel()
28301
fd8a4d2d6541 zeroconf: del is not a function
timeless <timeless@mozdev.org>
parents: 28300
diff changeset
  1383
                del browser
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1384
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1385
    def registerService(self, info, ttl=_DNS_TTL):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1386
        """Registers service information to the network with a default TTL
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1387
        of 60 seconds.  Zeroconf will then respond to requests for
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1388
        information for that service.  The name of the service may be
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1389
        changed if needed to make it unique on the network."""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1390
        self.checkService(info)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1391
        self.services[info.name.lower()] = info
28421
6d72cc613fc4 zeroconf: replace has_key with in
timeless <timeless@mozdev.org>
parents: 28420
diff changeset
  1392
        if info.type in self.servicetypes:
28300
15c5f50e7e13 zeroconf: add whitespace around operator
timeless <timeless@mozdev.org>
parents: 28299
diff changeset
  1393
            self.servicetypes[info.type] += 1
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1394
        else:
28300
15c5f50e7e13 zeroconf: add whitespace around operator
timeless <timeless@mozdev.org>
parents: 28299
diff changeset
  1395
            self.servicetypes[info.type] = 1
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1396
        now = currentTimeMillis()
28419
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
  1397
        nexttime = now
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1398
        i = 0
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1399
        while i < 3:
28419
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
  1400
            if now < nexttime:
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
  1401
                self.wait(nexttime - now)
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1402
                now = currentTimeMillis()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1403
                continue
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1404
            out = DNSOutgoing(_FLAGS_QR_RESPONSE | _FLAGS_AA)
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1405
            out.addAnswerAtTime(DNSPointer(info.type, _TYPE_PTR,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1406
                _CLASS_IN, ttl, info.name), 0)
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1407
            out.addAnswerAtTime(
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1408
                DNSService(
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1409
                    info.name, _TYPE_SRV,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1410
                    _CLASS_IN, ttl, info.priority, info.weight, info.port,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1411
                    info.server),
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1412
                0)
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1413
            out.addAnswerAtTime(
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1414
                DNSText(info.name, _TYPE_TXT, _CLASS_IN, ttl, info.text),
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1415
                0)
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1416
            if info.address:
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1417
                out.addAnswerAtTime(DNSAddress(info.server, _TYPE_A,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1418
                    _CLASS_IN, ttl, info.address), 0)
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1419
            self.send(out)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1420
            i += 1
28419
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
  1421
            nexttime += _REGISTER_TIME
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1422
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1423
    def unregisterService(self, info):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1424
        """Unregister a service."""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1425
        try:
28301
fd8a4d2d6541 zeroconf: del is not a function
timeless <timeless@mozdev.org>
parents: 28300
diff changeset
  1426
            del self.services[info.name.lower()]
28300
15c5f50e7e13 zeroconf: add whitespace around operator
timeless <timeless@mozdev.org>
parents: 28299
diff changeset
  1427
            if self.servicetypes[info.type] > 1:
15c5f50e7e13 zeroconf: add whitespace around operator
timeless <timeless@mozdev.org>
parents: 28299
diff changeset
  1428
                self.servicetypes[info.type] -= 1
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1429
            else:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1430
                del self.servicetypes[info.type]
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1431
        except KeyError:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1432
            pass
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1433
        now = currentTimeMillis()
28419
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
  1434
        nexttime = now
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1435
        i = 0
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1436
        while i < 3:
28419
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
  1437
            if now < nexttime:
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
  1438
                self.wait(nexttime - now)
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1439
                now = currentTimeMillis()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1440
                continue
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1441
            out = DNSOutgoing(_FLAGS_QR_RESPONSE | _FLAGS_AA)
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1442
            out.addAnswerAtTime(
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1443
                DNSPointer(info.type, _TYPE_PTR, _CLASS_IN, 0, info.name), 0)
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1444
            out.addAnswerAtTime(
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1445
                DNSService(info.name, _TYPE_SRV,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1446
                           _CLASS_IN, 0, info.priority, info.weight, info.port,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1447
                           info.name),
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1448
                0)
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1449
            out.addAnswerAtTime(DNSText(info.name, _TYPE_TXT,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1450
                _CLASS_IN, 0, info.text), 0)
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1451
            if info.address:
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1452
                out.addAnswerAtTime(DNSAddress(info.server, _TYPE_A,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1453
                    _CLASS_IN, 0, info.address), 0)
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1454
            self.send(out)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1455
            i += 1
28419
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
  1456
            nexttime += _UNREGISTER_TIME
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1457
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1458
    def unregisterAllServices(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1459
        """Unregister all registered services."""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1460
        if len(self.services) > 0:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1461
            now = currentTimeMillis()
28419
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
  1462
            nexttime = now
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1463
            i = 0
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1464
            while i < 3:
28419
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
  1465
                if now < nexttime:
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
  1466
                    self.wait(nexttime - now)
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1467
                    now = currentTimeMillis()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1468
                    continue
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1469
                out = DNSOutgoing(_FLAGS_QR_RESPONSE | _FLAGS_AA)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1470
                for info in self.services.values():
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1471
                    out.addAnswerAtTime(DNSPointer(info.type, _TYPE_PTR,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1472
                        _CLASS_IN, 0, info.name), 0)
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1473
                    out.addAnswerAtTime(
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1474
                        DNSService(info.name, _TYPE_SRV,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1475
                                   _CLASS_IN, 0, info.priority, info.weight,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1476
                                   info.port, info.server),
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1477
                        0)
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1478
                    out.addAnswerAtTime(DNSText(info.name, _TYPE_TXT,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1479
                        _CLASS_IN, 0, info.text), 0)
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1480
                    if info.address:
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1481
                        out.addAnswerAtTime(DNSAddress(info.server, _TYPE_A,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1482
                           _CLASS_IN, 0, info.address), 0)
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1483
                self.send(out)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1484
                i += 1
28419
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
  1485
                nexttime += _UNREGISTER_TIME
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1486
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1487
    def checkService(self, info):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1488
        """Checks the network for a unique service name, modifying the
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1489
        ServiceInfo passed in if it is not unique."""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1490
        now = currentTimeMillis()
28419
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
  1491
        nexttime = now
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1492
        i = 0
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1493
        while i < 3:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1494
            for record in self.cache.entriesWithName(info.type):
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1495
                if (record.type == _TYPE_PTR and not record.isExpired(now) and
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1496
                    record.alias == info.name):
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1497
                    if (info.name.find('.') < 0):
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1498
                        info.name = ("%w.[%s:%d].%s" %
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1499
                            (info.name, info.address, info.port, info.type))
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1500
                        self.checkService(info)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1501
                        return
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1502
                    raise NonUniqueNameException
28419
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
  1503
            if now < nexttime:
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
  1504
                self.wait(nexttime - now)
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1505
                now = currentTimeMillis()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1506
                continue
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1507
            out = DNSOutgoing(_FLAGS_QR_QUERY | _FLAGS_AA)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1508
            self.debug = out
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1509
            out.addQuestion(DNSQuestion(info.type, _TYPE_PTR, _CLASS_IN))
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1510
            out.addAuthoritativeAnswer(DNSPointer(info.type, _TYPE_PTR,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1511
                _CLASS_IN, _DNS_TTL, info.name))
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1512
            self.send(out)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1513
            i += 1
28419
eb9d0e828c30 zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents: 28302
diff changeset
  1514
            nexttime += _CHECK_TIME
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1515
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1516
    def addListener(self, listener, question):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1517
        """Adds a listener for a given question.  The listener will have
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1518
        its updateRecord method called when information is available to
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1519
        answer the question."""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1520
        now = currentTimeMillis()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1521
        self.listeners.append(listener)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1522
        if question is not None:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1523
            for record in self.cache.entriesWithName(question.name):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1524
                if question.answeredBy(record) and not record.isExpired(now):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1525
                    listener.updateRecord(self, now, record)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1526
        self.notifyAll()
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1527
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1528
    def removeListener(self, listener):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1529
        """Removes a listener."""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1530
        try:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1531
            self.listeners.remove(listener)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1532
            self.notifyAll()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1533
        except Exception:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1534
            pass
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1535
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1536
    def updateRecord(self, now, rec):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1537
        """Used to notify listeners of new information that has updated
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1538
        a record."""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1539
        for listener in self.listeners:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1540
            listener.updateRecord(self, now, rec)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1541
        self.notifyAll()
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1542
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1543
    def handleResponse(self, msg):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1544
        """Deal with incoming response packets.  All answers
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1545
        are held in the cache, and listeners are notified."""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1546
        now = currentTimeMillis()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1547
        for record in msg.answers:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1548
            expired = record.isExpired(now)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1549
            if record in self.cache.entries():
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1550
                if expired:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1551
                    self.cache.remove(record)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1552
                else:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1553
                    entry = self.cache.get(record)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1554
                    if entry is not None:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1555
                        entry.resetTTL(record)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1556
                        record = entry
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1557
            else:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1558
                self.cache.add(record)
7877
eba7f12b0c51 cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7874
diff changeset
  1559
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1560
            self.updateRecord(now, record)
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1561
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1562
    def handleQuery(self, msg, addr, port):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1563
        """Deal with incoming query packets.  Provides a response if
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1564
        possible."""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1565
        out = None
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1566
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1567
        # Support unicast client responses
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1568
        #
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1569
        if port != _MDNS_PORT:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1570
            out = DNSOutgoing(_FLAGS_QR_RESPONSE | _FLAGS_AA, 0)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1571
            for question in msg.questions:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1572
                out.addQuestion(question)
7874
d812029cda85 cleanup: drop variables for unused return values
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7071
diff changeset
  1573
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1574
        for question in msg.questions:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1575
            if question.type == _TYPE_PTR:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1576
                if question.name == "_services._dns-sd._udp.local.":
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1577
                    for stype in self.servicetypes.keys():
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1578
                        if out is None:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1579
                            out = DNSOutgoing(_FLAGS_QR_RESPONSE | _FLAGS_AA)
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1580
                        out.addAnswer(msg,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1581
                                      DNSPointer(
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1582
                                          "_services._dns-sd._udp.local.",
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1583
                                           _TYPE_PTR, _CLASS_IN,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1584
                                           _DNS_TTL, stype))
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1585
                for service in self.services.values():
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1586
                    if question.name == service.type:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1587
                        if out is None:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1588
                            out = DNSOutgoing(_FLAGS_QR_RESPONSE | _FLAGS_AA)
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1589
                        out.addAnswer(msg, DNSPointer(service.type, _TYPE_PTR,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1590
                            _CLASS_IN, _DNS_TTL, service.name))
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1591
            else:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1592
                try:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1593
                    if out is None:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1594
                        out = DNSOutgoing(_FLAGS_QR_RESPONSE | _FLAGS_AA)
7874
d812029cda85 cleanup: drop variables for unused return values
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7071
diff changeset
  1595
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1596
                    # Answer A record queries for any service addresses we know
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1597
                    if question.type == _TYPE_A or question.type == _TYPE_ANY:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1598
                        for service in self.services.values():
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1599
                            if service.server == question.name.lower():
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1600
                                out.addAnswer(msg,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1601
                                    DNSAddress(question.name, _TYPE_A,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1602
                                               _CLASS_IN | _CLASS_UNIQUE,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1603
                                               _DNS_TTL, service.address))
7874
d812029cda85 cleanup: drop variables for unused return values
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7071
diff changeset
  1604
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1605
                    service = self.services.get(question.name.lower(), None)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1606
                    if not service: continue
7874
d812029cda85 cleanup: drop variables for unused return values
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7071
diff changeset
  1607
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1608
                    if (question.type == _TYPE_SRV or
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1609
                        question.type == _TYPE_ANY):
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1610
                        out.addAnswer(msg,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1611
                            DNSService(question.name, _TYPE_SRV,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1612
                                       _CLASS_IN | _CLASS_UNIQUE,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1613
                                       _DNS_TTL, service.priority,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1614
                                       service.weight, service.port,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1615
                                       service.server))
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1616
                    if (question.type == _TYPE_TXT or
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1617
                        question.type == _TYPE_ANY):
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1618
                        out.addAnswer(msg, DNSText(question.name, _TYPE_TXT,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1619
                            _CLASS_IN | _CLASS_UNIQUE, _DNS_TTL, service.text))
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1620
                    if question.type == _TYPE_SRV:
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1621
                        out.addAdditionalAnswer(
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1622
                            DNSAddress(service.server, _TYPE_A,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1623
                                       _CLASS_IN | _CLASS_UNIQUE,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1624
                                       _DNS_TTL, service.address))
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1625
                except Exception:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1626
                    traceback.print_exc()
7874
d812029cda85 cleanup: drop variables for unused return values
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7071
diff changeset
  1627
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1628
        if out is not None and out.answers:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1629
            out.id = msg.id
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1630
            self.send(out, addr, port)
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1631
28302
e96a3ae025ed zeroconf: remove whitespace around = for named parameters
timeless <timeless@mozdev.org>
parents: 28301
diff changeset
  1632
    def send(self, out, addr=_MDNS_ADDR, port=_MDNS_PORT):
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1633
        """Sends an outgoing packet."""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1634
        # This is a quick test to see if we can parse the packets we generate
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1635
        #temp = DNSIncoming(out.packet())
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1636
        try:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1637
            self.socket.sendto(out.packet(), 0, (addr, port))
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1638
        except Exception:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1639
            # Ignore this, it may be a temporary loss of network connection
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1640
            pass
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1641
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1642
    def close(self):
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1643
        """Ends the background threads, and prevent this instance from
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1644
        servicing further queries."""
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1645
        if globals()['_GLOBAL_DONE'] == 0:
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1646
            globals()['_GLOBAL_DONE'] = 1
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1647
            self.notifyAll()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1648
            self.engine.notify()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1649
            self.unregisterAllServices()
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1650
            self.socket.setsockopt(socket.SOL_IP, socket.IP_DROP_MEMBERSHIP,
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1651
                socket.inet_aton(_MDNS_ADDR) + socket.inet_aton('0.0.0.0'))
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1652
            self.socket.close()
7877
eba7f12b0c51 cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7874
diff changeset
  1653
7071
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1654
# Test a few module features, including service registration, service
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1655
# query (for Zoe), and service unregistration.
643c751e60b2 zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
  1656
7877
eba7f12b0c51 cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 7874
diff changeset
  1657
if __name__ == '__main__':
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1658
    print("Multicast DNS Service Discovery for Python, version", __version__)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1659
    r = Zeroconf()
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1660
    print("1. Testing registration of a service...")
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1661
    desc = {'version':'0.10','a':'test value', 'b':'another value'}
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1662
    info = ServiceInfo("_http._tcp.local.",
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1663
                       "My Service Name._http._tcp.local.",
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1664
        socket.inet_aton("127.0.0.1"), 1234, 0, 0, desc)
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1665
    print("   Registering service...")
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1666
    r.registerService(info)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1667
    print("   Registration done.")
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1668
    print("2. Testing query of service information...")
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1669
    print("   Getting ZOE service:",
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1670
        str(r.getServiceInfo("_http._tcp.local.", "ZOE._http._tcp.local.")))
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1671
    print("   Query done.")
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1672
    print("3. Testing query of own service...")
28299
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1673
    print("   Getting self:",
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1674
        str(r.getServiceInfo("_http._tcp.local.",
acea9dd8cf7e zeroconf: wrap long lines
timeless <timeless@mozdev.org>
parents: 28298
diff changeset
  1675
                             "My Service Name._http._tcp.local.")))
28298
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1676
    print("   Query done.")
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1677
    print("4. Testing unregister of service information...")
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1678
    r.unregisterService(info)
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1679
    print("   Unregister done.")
c318e8fd0e62 zeroconf: drop tabs
timeless <timeless@mozdev.org>
parents: 28297
diff changeset
  1680
    r.close()