author | Phil Cohen <phillco@fb.com> |
Sun, 13 Aug 2017 20:06:52 -0700 | |
changeset 33828 | 8b91a4ff23ad |
parent 28504 | 3c90090320ad |
child 34447 | 5385b76fd1fd |
permissions | -rw-r--r-- |
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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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159 |
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_CLASSES = { _CLASS_IN : "in", |
28298 | 161 |
_CLASS_CS : "cs", |
162 |
_CLASS_CH : "ch", |
|
163 |
_CLASS_HS : "hs", |
|
164 |
_CLASS_NONE : "none", |
|
165 |
_CLASS_ANY : "any" } |
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166 |
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_TYPES = { _TYPE_A : "a", |
28298 | 168 |
_TYPE_NS : "ns", |
169 |
_TYPE_MD : "md", |
|
170 |
_TYPE_MF : "mf", |
|
171 |
_TYPE_CNAME : "cname", |
|
172 |
_TYPE_SOA : "soa", |
|
173 |
_TYPE_MB : "mb", |
|
174 |
_TYPE_MG : "mg", |
|
175 |
_TYPE_MR : "mr", |
|
176 |
_TYPE_NULL : "null", |
|
177 |
_TYPE_WKS : "wks", |
|
178 |
_TYPE_PTR : "ptr", |
|
179 |
_TYPE_HINFO : "hinfo", |
|
180 |
_TYPE_MINFO : "minfo", |
|
181 |
_TYPE_MX : "mx", |
|
182 |
_TYPE_TXT : "txt", |
|
183 |
_TYPE_AAAA : "quada", |
|
184 |
_TYPE_SRV : "srv", |
|
185 |
_TYPE_ANY : "any" } |
|
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|
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# utility functions |
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def currentTimeMillis(): |
28298 | 190 |
"""Current system time in milliseconds""" |
191 |
return time.time() * 1000 |
|
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192 |
|
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# Exceptions |
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class NonLocalNameException(Exception): |
28298 | 196 |
pass |
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197 |
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class NonUniqueNameException(Exception): |
28298 | 199 |
pass |
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class NamePartTooLongException(Exception): |
28298 | 202 |
pass |
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203 |
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class AbstractMethodException(Exception): |
28298 | 205 |
pass |
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206 |
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class BadTypeInNameException(Exception): |
28298 | 208 |
pass |
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209 |
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class BadDomainName(Exception): |
28298 | 211 |
def __init__(self, pos): |
212 |
Exception.__init__(self, "at position %s" % pos) |
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213 |
|
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class BadDomainNameCircular(BadDomainName): |
28298 | 215 |
pass |
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216 |
|
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# implementation classes |
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class DNSEntry(object): |
28298 | 220 |
"""A DNS entry""" |
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221 |
|
28298 | 222 |
def __init__(self, name, type, clazz): |
223 |
self.key = string.lower(name) |
|
224 |
self.name = name |
|
225 |
self.type = type |
|
226 |
self.clazz = clazz & _CLASS_MASK |
|
227 |
self.unique = (clazz & _CLASS_UNIQUE) != 0 |
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|
28298 | 229 |
def __eq__(self, other): |
230 |
"""Equality test on name, type, and class""" |
|
231 |
if isinstance(other, DNSEntry): |
|
28299 | 232 |
return (self.name == other.name and self.type == other.type and |
233 |
self.clazz == other.clazz) |
|
28298 | 234 |
return 0 |
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|
28298 | 236 |
def __ne__(self, other): |
237 |
"""Non-equality test""" |
|
238 |
return not self.__eq__(other) |
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|
28298 | 240 |
def getClazz(self, clazz): |
241 |
"""Class accessor""" |
|
242 |
try: |
|
243 |
return _CLASSES[clazz] |
|
244 |
except KeyError: |
|
245 |
return "?(%s)" % (clazz) |
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|
28298 | 247 |
def getType(self, type): |
248 |
"""Type accessor""" |
|
249 |
try: |
|
250 |
return _TYPES[type] |
|
251 |
except KeyError: |
|
252 |
return "?(%s)" % (type) |
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|
28298 | 254 |
def toString(self, hdr, other): |
255 |
"""String representation with additional information""" |
|
28299 | 256 |
result = ("%s[%s,%s" % |
257 |
(hdr, self.getType(self.type), self.getClazz(self.clazz))) |
|
28298 | 258 |
if self.unique: |
259 |
result += "-unique," |
|
260 |
else: |
|
261 |
result += "," |
|
262 |
result += self.name |
|
263 |
if other is not None: |
|
264 |
result += ",%s]" % (other) |
|
265 |
else: |
|
266 |
result += "]" |
|
267 |
return result |
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class DNSQuestion(DNSEntry): |
28298 | 270 |
"""A DNS question entry""" |
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|
28298 | 272 |
def __init__(self, name, type, clazz): |
273 |
if not name.endswith(".local."): |
|
274 |
raise NonLocalNameException(name) |
|
275 |
DNSEntry.__init__(self, name, type, clazz) |
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|
28298 | 277 |
def answeredBy(self, rec): |
278 |
"""Returns true if the question is answered by the record""" |
|
28299 | 279 |
return (self.clazz == rec.clazz and |
280 |
(self.type == rec.type or self.type == _TYPE_ANY) and |
|
281 |
self.name == rec.name) |
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|
28298 | 283 |
def __repr__(self): |
284 |
"""String representation""" |
|
285 |
return DNSEntry.toString(self, "question", None) |
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286 |
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class DNSRecord(DNSEntry): |
28298 | 289 |
"""A DNS record - like a DNS entry, but has a TTL""" |
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|
28298 | 291 |
def __init__(self, name, type, clazz, ttl): |
292 |
DNSEntry.__init__(self, name, type, clazz) |
|
293 |
self.ttl = ttl |
|
294 |
self.created = currentTimeMillis() |
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295 |
|
28298 | 296 |
def __eq__(self, other): |
297 |
"""Tests equality as per DNSRecord""" |
|
298 |
if isinstance(other, DNSRecord): |
|
299 |
return DNSEntry.__eq__(self, other) |
|
300 |
return 0 |
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|
28298 | 302 |
def suppressedBy(self, msg): |
303 |
"""Returns true if any answer in a message can suffice for the |
|
304 |
information held in this record.""" |
|
305 |
for record in msg.answers: |
|
306 |
if self.suppressedByAnswer(record): |
|
307 |
return 1 |
|
308 |
return 0 |
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|
28298 | 310 |
def suppressedByAnswer(self, other): |
311 |
"""Returns true if another record has same name, type and class, |
|
312 |
and if its TTL is at least half of this record's.""" |
|
313 |
if self == other and other.ttl > (self.ttl / 2): |
|
314 |
return 1 |
|
315 |
return 0 |
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|
28298 | 317 |
def getExpirationTime(self, percent): |
318 |
"""Returns the time at which this record will have expired |
|
319 |
by a certain percentage.""" |
|
320 |
return self.created + (percent * self.ttl * 10) |
|
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321 |
|
28298 | 322 |
def getRemainingTTL(self, now): |
323 |
"""Returns the remaining TTL in seconds.""" |
|
324 |
return max(0, (self.getExpirationTime(100) - now) / 1000) |
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325 |
|
28298 | 326 |
def isExpired(self, now): |
327 |
"""Returns true if this record has expired.""" |
|
328 |
return self.getExpirationTime(100) <= now |
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329 |
|
28298 | 330 |
def isStale(self, now): |
331 |
"""Returns true if this record is at least half way expired.""" |
|
332 |
return self.getExpirationTime(50) <= now |
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333 |
|
28298 | 334 |
def resetTTL(self, other): |
335 |
"""Sets this record's TTL and created time to that of |
|
336 |
another record.""" |
|
337 |
self.created = other.created |
|
338 |
self.ttl = other.ttl |
|
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339 |
|
28298 | 340 |
def write(self, out): |
341 |
"""Abstract method""" |
|
342 |
raise AbstractMethodException |
|
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343 |
|
28298 | 344 |
def toString(self, other): |
345 |
"""String representation with additional information""" |
|
28299 | 346 |
arg = ("%s/%s,%s" % |
347 |
(self.ttl, self.getRemainingTTL(currentTimeMillis()), other)) |
|
28298 | 348 |
return DNSEntry.toString(self, "record", arg) |
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349 |
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350 |
class DNSAddress(DNSRecord): |
28298 | 351 |
"""A DNS address record""" |
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352 |
|
28298 | 353 |
def __init__(self, name, type, clazz, ttl, address): |
354 |
DNSRecord.__init__(self, name, type, clazz, ttl) |
|
355 |
self.address = address |
|
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356 |
|
28298 | 357 |
def write(self, out): |
358 |
"""Used in constructing an outgoing packet""" |
|
359 |
out.writeString(self.address, len(self.address)) |
|
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|
360 |
|
28298 | 361 |
def __eq__(self, other): |
362 |
"""Tests equality on address""" |
|
363 |
if isinstance(other, DNSAddress): |
|
364 |
return self.address == other.address |
|
365 |
return 0 |
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366 |
|
28298 | 367 |
def __repr__(self): |
368 |
"""String representation""" |
|
369 |
try: |
|
370 |
return socket.inet_ntoa(self.address) |
|
371 |
except Exception: |
|
372 |
return self.address |
|
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374 |
class DNSHinfo(DNSRecord): |
28298 | 375 |
"""A DNS host information record""" |
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|
376 |
|
28298 | 377 |
def __init__(self, name, type, clazz, ttl, cpu, os): |
378 |
DNSRecord.__init__(self, name, type, clazz, ttl) |
|
379 |
self.cpu = cpu |
|
380 |
self.os = os |
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|
381 |
|
28298 | 382 |
def write(self, out): |
383 |
"""Used in constructing an outgoing packet""" |
|
384 |
out.writeString(self.cpu, len(self.cpu)) |
|
385 |
out.writeString(self.os, len(self.os)) |
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|
386 |
|
28298 | 387 |
def __eq__(self, other): |
388 |
"""Tests equality on cpu and os""" |
|
389 |
if isinstance(other, DNSHinfo): |
|
390 |
return self.cpu == other.cpu and self.os == other.os |
|
391 |
return 0 |
|
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|
392 |
|
28298 | 393 |
def __repr__(self): |
394 |
"""String representation""" |
|
395 |
return self.cpu + " " + self.os |
|
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396 |
|
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397 |
class DNSPointer(DNSRecord): |
28298 | 398 |
"""A DNS pointer record""" |
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|
399 |
|
28298 | 400 |
def __init__(self, name, type, clazz, ttl, alias): |
401 |
DNSRecord.__init__(self, name, type, clazz, ttl) |
|
402 |
self.alias = alias |
|
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|
403 |
|
28298 | 404 |
def write(self, out): |
405 |
"""Used in constructing an outgoing packet""" |
|
406 |
out.writeName(self.alias) |
|
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|
407 |
|
28298 | 408 |
def __eq__(self, other): |
409 |
"""Tests equality on alias""" |
|
410 |
if isinstance(other, DNSPointer): |
|
411 |
return self.alias == other.alias |
|
412 |
return 0 |
|
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|
413 |
|
28298 | 414 |
def __repr__(self): |
415 |
"""String representation""" |
|
416 |
return self.toString(self.alias) |
|
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|
417 |
|
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|
418 |
class DNSText(DNSRecord): |
28298 | 419 |
"""A DNS text record""" |
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|
420 |
|
28298 | 421 |
def __init__(self, name, type, clazz, ttl, text): |
422 |
DNSRecord.__init__(self, name, type, clazz, ttl) |
|
423 |
self.text = text |
|
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|
424 |
|
28298 | 425 |
def write(self, out): |
426 |
"""Used in constructing an outgoing packet""" |
|
427 |
out.writeString(self.text, len(self.text)) |
|
7071
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Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
428 |
|
28298 | 429 |
def __eq__(self, other): |
430 |
"""Tests equality on text""" |
|
431 |
if isinstance(other, DNSText): |
|
432 |
return self.text == other.text |
|
433 |
return 0 |
|
7071
643c751e60b2
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Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
434 |
|
28298 | 435 |
def __repr__(self): |
436 |
"""String representation""" |
|
437 |
if len(self.text) > 10: |
|
438 |
return self.toString(self.text[:7] + "...") |
|
439 |
else: |
|
440 |
return self.toString(self.text) |
|
7071
643c751e60b2
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Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
441 |
|
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
442 |
class DNSService(DNSRecord): |
28298 | 443 |
"""A DNS service record""" |
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parents:
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diff
changeset
|
444 |
|
28298 | 445 |
def __init__(self, name, type, clazz, ttl, priority, weight, port, server): |
446 |
DNSRecord.__init__(self, name, type, clazz, ttl) |
|
447 |
self.priority = priority |
|
448 |
self.weight = weight |
|
449 |
self.port = port |
|
450 |
self.server = server |
|
7071
643c751e60b2
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Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
451 |
|
28298 | 452 |
def write(self, out): |
453 |
"""Used in constructing an outgoing packet""" |
|
454 |
out.writeShort(self.priority) |
|
455 |
out.writeShort(self.weight) |
|
456 |
out.writeShort(self.port) |
|
457 |
out.writeName(self.server) |
|
7071
643c751e60b2
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Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
458 |
|
28298 | 459 |
def __eq__(self, other): |
460 |
"""Tests equality on priority, weight, port and server""" |
|
461 |
if isinstance(other, DNSService): |
|
28299 | 462 |
return (self.priority == other.priority and |
463 |
self.weight == other.weight and |
|
464 |
self.port == other.port and |
|
465 |
self.server == other.server) |
|
28298 | 466 |
return 0 |
7071
643c751e60b2
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Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
467 |
|
28298 | 468 |
def __repr__(self): |
469 |
"""String representation""" |
|
470 |
return self.toString("%s:%s" % (self.server, self.port)) |
|
7071
643c751e60b2
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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 | 473 |
"""Object representation of an incoming DNS packet""" |
7877
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diff
changeset
|
474 |
|
28298 | 475 |
def __init__(self, data): |
476 |
"""Constructor from string holding bytes of packet""" |
|
477 |
self.offset = 0 |
|
478 |
self.data = data |
|
479 |
self.questions = [] |
|
480 |
self.answers = [] |
|
28419
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timeless <timeless@mozdev.org>
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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
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parents:
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diff
changeset
|
485 |
|
28298 | 486 |
self.readHeader() |
487 |
self.readQuestions() |
|
488 |
self.readOthers() |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
489 |
|
28298 | 490 |
def readHeader(self): |
491 |
"""Reads header portion of packet""" |
|
492 |
format = '!HHHHHH' |
|
493 |
length = struct.calcsize(format) |
|
28300
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timeless <timeless@mozdev.org>
parents:
28299
diff
changeset
|
494 |
info = struct.unpack(format, |
15c5f50e7e13
zeroconf: add whitespace around operator
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parents:
28299
diff
changeset
|
495 |
self.data[self.offset:self.offset + length]) |
28298 | 496 |
self.offset += length |
7071
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parents:
diff
changeset
|
497 |
|
28298 | 498 |
self.id = info[0] |
499 |
self.flags = info[1] |
|
28419
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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 | 505 |
def readQuestions(self): |
506 |
"""Reads questions section of packet""" |
|
507 |
format = '!HH' |
|
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 | 510 |
name = self.readName() |
28299 | 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 | 513 |
self.offset += length |
7877
eba7f12b0c51
cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
7874
diff
changeset
|
514 |
|
28298 | 515 |
try: |
516 |
question = DNSQuestion(name, info[0], info[1]) |
|
517 |
self.questions.append(question) |
|
518 |
except NonLocalNameException: |
|
519 |
pass |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
520 |
|
28298 | 521 |
def readInt(self): |
522 |
"""Reads an integer from the packet""" |
|
523 |
format = '!I' |
|
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 | 527 |
self.offset += length |
528 |
return info[0] |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
529 |
|
28298 | 530 |
def readCharacterString(self): |
531 |
"""Reads a character string from the packet""" |
|
532 |
length = ord(self.data[self.offset]) |
|
533 |
self.offset += 1 |
|
534 |
return self.readString(length) |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
535 |
|
28298 | 536 |
def readString(self, len): |
537 |
"""Reads a string of a given length from the packet""" |
|
538 |
format = '!' + str(len) + 's' |
|
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 | 542 |
self.offset += length |
543 |
return info[0] |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
544 |
|
28298 | 545 |
def readUnsignedShort(self): |
546 |
"""Reads an unsigned short from the packet""" |
|
547 |
format = '!H' |
|
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 | 551 |
self.offset += length |
552 |
return info[0] |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
553 |
|
28298 | 554 |
def readOthers(self): |
28299 | 555 |
"""Reads answers, authorities and additionals section of the packet""" |
28298 | 556 |
format = '!HHiH' |
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 | 559 |
for i in range(0, n): |
560 |
domain = self.readName() |
|
28299 | 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 | 563 |
self.offset += length |
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
564 |
|
28298 | 565 |
rec = None |
566 |
if info[0] == _TYPE_A: |
|
28299 | 567 |
rec = DNSAddress(domain, info[0], info[1], info[2], |
568 |
self.readString(4)) |
|
28298 | 569 |
elif info[0] == _TYPE_CNAME or info[0] == _TYPE_PTR: |
28299 | 570 |
rec = DNSPointer(domain, info[0], info[1], info[2], |
571 |
self.readName()) |
|
28298 | 572 |
elif info[0] == _TYPE_TXT: |
28299 | 573 |
rec = DNSText(domain, info[0], info[1], info[2], |
574 |
self.readString(info[3])) |
|
28298 | 575 |
elif info[0] == _TYPE_SRV: |
28299 | 576 |
rec = DNSService(domain, info[0], info[1], info[2], |
577 |
self.readUnsignedShort(), |
|
578 |
self.readUnsignedShort(), |
|
579 |
self.readUnsignedShort(), |
|
580 |
self.readName()) |
|
28298 | 581 |
elif info[0] == _TYPE_HINFO: |
28299 | 582 |
rec = DNSHinfo(domain, info[0], info[1], info[2], |
583 |
self.readCharacterString(), |
|
584 |
self.readCharacterString()) |
|
28298 | 585 |
elif info[0] == _TYPE_AAAA: |
28299 | 586 |
rec = DNSAddress(domain, info[0], info[1], info[2], |
587 |
self.readString(16)) |
|
28298 | 588 |
else: |
589 |
# Try to ignore types we don't know about |
|
590 |
# this may mean the rest of the name is |
|
591 |
# unable to be parsed, and may show errors |
|
592 |
# so this is left for debugging. New types |
|
593 |
# encountered need to be parsed properly. |
|
594 |
# |
|
595 |
#print "UNKNOWN TYPE = " + str(info[0]) |
|
596 |
#raise BadTypeInNameException |
|
597 |
self.offset += info[3] |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
598 |
|
28298 | 599 |
if rec is not None: |
600 |
self.answers.append(rec) |
|
7877
eba7f12b0c51
cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
7874
diff
changeset
|
601 |
|
28298 | 602 |
def isQuery(self): |
603 |
"""Returns true if this is a query""" |
|
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 | 606 |
def isResponse(self): |
607 |
"""Returns true if this is a response""" |
|
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 | 610 |
def readUTF(self, offset, len): |
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 | 614 |
def readName(self): |
615 |
"""Reads a domain name from the packet""" |
|
616 |
result = '' |
|
617 |
off = self.offset |
|
618 |
next = -1 |
|
619 |
first = off |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
620 |
|
28298 | 621 |
while True: |
622 |
len = ord(self.data[off]) |
|
623 |
off += 1 |
|
624 |
if len == 0: |
|
625 |
break |
|
626 |
t = len & 0xC0 |
|
627 |
if t == 0x00: |
|
628 |
result = ''.join((result, self.readUTF(off, len) + '.')) |
|
629 |
off += len |
|
630 |
elif t == 0xC0: |
|
631 |
if next < 0: |
|
632 |
next = off + 1 |
|
633 |
off = ((len & 0x3F) << 8) | ord(self.data[off]) |
|
634 |
if off >= first: |
|
635 |
raise BadDomainNameCircular(off) |
|
636 |
first = off |
|
637 |
else: |
|
638 |
raise BadDomainName(off) |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
639 |
|
28298 | 640 |
if next >= 0: |
641 |
self.offset = next |
|
642 |
else: |
|
643 |
self.offset = off |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
644 |
|
28298 | 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 | 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 | 652 |
self.finished = 0 |
653 |
self.id = 0 |
|
654 |
self.multicast = multicast |
|
655 |
self.flags = flags |
|
656 |
self.names = {} |
|
657 |
self.data = [] |
|
658 |
self.size = 12 |
|
7877
eba7f12b0c51
cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
7874
diff
changeset
|
659 |
|
28298 | 660 |
self.questions = [] |
661 |
self.answers = [] |
|
662 |
self.authorities = [] |
|
663 |
self.additionals = [] |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
664 |
|
28298 | 665 |
def addQuestion(self, record): |
666 |
"""Adds a question""" |
|
667 |
self.questions.append(record) |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
668 |
|
28298 | 669 |
def addAnswer(self, inp, record): |
670 |
"""Adds an answer""" |
|
671 |
if not record.suppressedBy(inp): |
|
672 |
self.addAnswerAtTime(record, 0) |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
673 |
|
28298 | 674 |
def addAnswerAtTime(self, record, now): |
675 |
"""Adds an answer if if does not expire by a certain time""" |
|
676 |
if record is not None: |
|
677 |
if now == 0 or not record.isExpired(now): |
|
678 |
self.answers.append((record, now)) |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
679 |
|
28298 | 680 |
def addAuthoritativeAnswer(self, record): |
681 |
"""Adds an authoritative answer""" |
|
682 |
self.authorities.append(record) |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
683 |
|
28298 | 684 |
def addAdditionalAnswer(self, record): |
685 |
"""Adds an additional answer""" |
|
686 |
self.additionals.append(record) |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
687 |
|
28298 | 688 |
def writeByte(self, value): |
689 |
"""Writes a single byte to the packet""" |
|
690 |
format = '!c' |
|
691 |
self.data.append(struct.pack(format, chr(value))) |
|
692 |
self.size += 1 |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
693 |
|
28298 | 694 |
def insertShort(self, index, value): |
695 |
"""Inserts an unsigned short in a certain position in the packet""" |
|
696 |
format = '!H' |
|
697 |
self.data.insert(index, struct.pack(format, value)) |
|
698 |
self.size += 2 |
|
7877
eba7f12b0c51
cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
7874
diff
changeset
|
699 |
|
28298 | 700 |
def writeShort(self, value): |
701 |
"""Writes an unsigned short to the packet""" |
|
702 |
format = '!H' |
|
703 |
self.data.append(struct.pack(format, value)) |
|
704 |
self.size += 2 |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
705 |
|
28298 | 706 |
def writeInt(self, value): |
707 |
"""Writes an unsigned integer to the packet""" |
|
708 |
format = '!I' |
|
709 |
self.data.append(struct.pack(format, int(value))) |
|
710 |
self.size += 4 |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
711 |
|
28298 | 712 |
def writeString(self, value, length): |
713 |
"""Writes a string to the packet""" |
|
714 |
format = '!' + str(length) + 's' |
|
715 |
self.data.append(struct.pack(format, value)) |
|
716 |
self.size += length |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
717 |
|
28298 | 718 |
def writeUTF(self, s): |
719 |
"""Writes a UTF-8 string of a given length to the packet""" |
|
720 |
utfstr = s.encode('utf-8') |
|
721 |
length = len(utfstr) |
|
722 |
if length > 64: |
|
723 |
raise NamePartTooLongException |
|
724 |
self.writeByte(length) |
|
725 |
self.writeString(utfstr, length) |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
726 |
|
28298 | 727 |
def writeName(self, name): |
728 |
"""Writes a domain name to the packet""" |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
729 |
|
28298 | 730 |
try: |
731 |
# Find existing instance of this name in packet |
|
732 |
# |
|
733 |
index = self.names[name] |
|
734 |
except KeyError: |
|
735 |
# No record of this name already, so write it |
|
736 |
# out as normal, recording the location of the name |
|
737 |
# for future pointers to it. |
|
738 |
# |
|
739 |
self.names[name] = self.size |
|
740 |
parts = name.split('.') |
|
741 |
if parts[-1] == '': |
|
742 |
parts = parts[:-1] |
|
743 |
for part in parts: |
|
744 |
self.writeUTF(part) |
|
745 |
self.writeByte(0) |
|
746 |
return |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
747 |
|
28298 | 748 |
# An index was found, so write a pointer to it |
749 |
# |
|
750 |
self.writeByte((index >> 8) | 0xC0) |
|
751 |
self.writeByte(index) |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
752 |
|
28298 | 753 |
def writeQuestion(self, question): |
754 |
"""Writes a question to the packet""" |
|
755 |
self.writeName(question.name) |
|
756 |
self.writeShort(question.type) |
|
757 |
self.writeShort(question.clazz) |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
758 |
|
28298 | 759 |
def writeRecord(self, record, now): |
760 |
"""Writes a record (answer, authoritative answer, additional) to |
|
761 |
the packet""" |
|
762 |
self.writeName(record.name) |
|
763 |
self.writeShort(record.type) |
|
764 |
if record.unique and self.multicast: |
|
765 |
self.writeShort(record.clazz | _CLASS_UNIQUE) |
|
766 |
else: |
|
767 |
self.writeShort(record.clazz) |
|
768 |
if now == 0: |
|
769 |
self.writeInt(record.ttl) |
|
770 |
else: |
|
771 |
self.writeInt(record.getRemainingTTL(now)) |
|
772 |
index = len(self.data) |
|
773 |
# Adjust size for the short we will write before this record |
|
774 |
# |
|
775 |
self.size += 2 |
|
776 |
record.write(self) |
|
777 |
self.size -= 2 |
|
7877
eba7f12b0c51
cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
7874
diff
changeset
|
778 |
|
28298 | 779 |
length = len(''.join(self.data[index:])) |
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 | 782 |
def packet(self): |
783 |
"""Returns a string containing the packet's bytes |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
784 |
|
28298 | 785 |
No further parts should be added to the packet once this |
786 |
is done.""" |
|
787 |
if not self.finished: |
|
788 |
self.finished = 1 |
|
789 |
for question in self.questions: |
|
790 |
self.writeQuestion(question) |
|
791 |
for answer, time_ in self.answers: |
|
792 |
self.writeRecord(answer, time_) |
|
793 |
for authority in self.authorities: |
|
794 |
self.writeRecord(authority, 0) |
|
795 |
for additional in self.additionals: |
|
796 |
self.writeRecord(additional, 0) |
|
7877
eba7f12b0c51
cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
7874
diff
changeset
|
797 |
|
28298 | 798 |
self.insertShort(0, len(self.additionals)) |
799 |
self.insertShort(0, len(self.authorities)) |
|
800 |
self.insertShort(0, len(self.answers)) |
|
801 |
self.insertShort(0, len(self.questions)) |
|
802 |
self.insertShort(0, self.flags) |
|
803 |
if self.multicast: |
|
804 |
self.insertShort(0, 0) |
|
805 |
else: |
|
806 |
self.insertShort(0, self.id) |
|
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 | 811 |
"""A cache of DNS entries""" |
7877
eba7f12b0c51
cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
7874
diff
changeset
|
812 |
|
28298 | 813 |
def __init__(self): |
814 |
self.cache = {} |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
815 |
|
28298 | 816 |
def add(self, entry): |
817 |
"""Adds an entry""" |
|
818 |
try: |
|
819 |
list = self.cache[entry.key] |
|
820 |
except KeyError: |
|
821 |
list = self.cache[entry.key] = [] |
|
822 |
list.append(entry) |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
823 |
|
28298 | 824 |
def remove(self, entry): |
825 |
"""Removes an entry""" |
|
826 |
try: |
|
827 |
list = self.cache[entry.key] |
|
828 |
list.remove(entry) |
|
829 |
except KeyError: |
|
830 |
pass |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
831 |
|
28298 | 832 |
def get(self, entry): |
833 |
"""Gets an entry by key. Will return None if there is no |
|
834 |
matching entry.""" |
|
835 |
try: |
|
836 |
list = self.cache[entry.key] |
|
837 |
return list[list.index(entry)] |
|
838 |
except (KeyError, ValueError): |
|
839 |
return None |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
840 |
|
28298 | 841 |
def getByDetails(self, name, type, clazz): |
842 |
"""Gets an entry by details. Will return None if there is |
|
843 |
no matching entry.""" |
|
844 |
entry = DNSEntry(name, type, clazz) |
|
845 |
return self.get(entry) |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
846 |
|
28298 | 847 |
def entriesWithName(self, name): |
848 |
"""Returns a list of entries whose key matches the name.""" |
|
849 |
try: |
|
850 |
return self.cache[name] |
|
851 |
except KeyError: |
|
852 |
return [] |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
853 |
|
28298 | 854 |
def entries(self): |
855 |
"""Returns a list of all entries""" |
|
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 | 858 |
except Exception: |
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 | 863 |
"""An engine wraps read access to sockets, allowing objects that |
864 |
need to receive data from sockets to be called back when the |
|
865 |
sockets are ready. |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
866 |
|
28298 | 867 |
A reader needs a handle_read() method, which is called when the socket |
868 |
it is interested in is ready for reading. |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
869 |
|
28298 | 870 |
Writers are not implemented here, because we only send short |
871 |
packets. |
|
872 |
""" |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
873 |
|
28298 | 874 |
def __init__(self, zeroconf): |
875 |
threading.Thread.__init__(self) |
|
876 |
self.zeroconf = zeroconf |
|
877 |
self.readers = {} # maps socket to reader |
|
878 |
self.timeout = 5 |
|
879 |
self.condition = threading.Condition() |
|
880 |
self.start() |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
881 |
|
28298 | 882 |
def run(self): |
883 |
while not globals()['_GLOBAL_DONE']: |
|
884 |
rs = self.getReaders() |
|
885 |
if len(rs) == 0: |
|
886 |
# No sockets to manage, but we wait for the timeout |
|
887 |
# or addition of a socket |
|
888 |
# |
|
889 |
self.condition.acquire() |
|
890 |
self.condition.wait(self.timeout) |
|
891 |
self.condition.release() |
|
892 |
else: |
|
893 |
try: |
|
894 |
rr, wr, er = select.select(rs, [], [], self.timeout) |
|
895 |
for sock in rr: |
|
896 |
try: |
|
897 |
self.readers[sock].handle_read() |
|
898 |
except Exception: |
|
899 |
if not globals()['_GLOBAL_DONE']: |
|
900 |
traceback.print_exc() |
|
901 |
except Exception: |
|
902 |
pass |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
903 |
|
28298 | 904 |
def getReaders(self): |
905 |
self.condition.acquire() |
|
906 |
result = self.readers.keys() |
|
907 |
self.condition.release() |
|
908 |
return result |
|
7877
eba7f12b0c51
cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
7874
diff
changeset
|
909 |
|
28298 | 910 |
def addReader(self, reader, socket): |
911 |
self.condition.acquire() |
|
912 |
self.readers[socket] = reader |
|
913 |
self.condition.notify() |
|
914 |
self.condition.release() |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
915 |
|
28298 | 916 |
def delReader(self, socket): |
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 | 919 |
self.condition.notify() |
920 |
self.condition.release() |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
921 |
|
28298 | 922 |
def notify(self): |
923 |
self.condition.acquire() |
|
924 |
self.condition.notify() |
|
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 | 928 |
"""A Listener is used by this module to listen on the multicast |
929 |
group to which DNS messages are sent, allowing the implementation |
|
930 |
to cache information as it arrives. |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
931 |
|
28298 | 932 |
It requires registration with an Engine object in order to have |
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 | 935 |
def __init__(self, zeroconf): |
936 |
self.zeroconf = zeroconf |
|
937 |
self.zeroconf.engine.addReader(self, self.zeroconf.socket) |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
938 |
|
28298 | 939 |
def handle_read(self): |
940 |
data, (addr, port) = self.zeroconf.socket.recvfrom(_MAX_MSG_ABSOLUTE) |
|
941 |
self.data = data |
|
942 |
msg = DNSIncoming(data) |
|
943 |
if msg.isQuery(): |
|
944 |
# Always multicast responses |
|
945 |
# |
|
946 |
if port == _MDNS_PORT: |
|
947 |
self.zeroconf.handleQuery(msg, _MDNS_ADDR, _MDNS_PORT) |
|
948 |
# If it's not a multicast query, reply via unicast |
|
949 |
# and multicast |
|
950 |
# |
|
951 |
elif port == _DNS_PORT: |
|
952 |
self.zeroconf.handleQuery(msg, addr, port) |
|
953 |
self.zeroconf.handleQuery(msg, _MDNS_ADDR, _MDNS_PORT) |
|
954 |
else: |
|
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 | 959 |
"""A Reaper is used by this module to remove cache entries that |
960 |
have expired.""" |
|
7877
eba7f12b0c51
cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
7874
diff
changeset
|
961 |
|
28298 | 962 |
def __init__(self, zeroconf): |
963 |
threading.Thread.__init__(self) |
|
964 |
self.zeroconf = zeroconf |
|
965 |
self.start() |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
966 |
|
28298 | 967 |
def run(self): |
968 |
while True: |
|
969 |
self.zeroconf.wait(10 * 1000) |
|
970 |
if globals()['_GLOBAL_DONE']: |
|
971 |
return |
|
972 |
now = currentTimeMillis() |
|
973 |
for record in self.zeroconf.cache.entries(): |
|
974 |
if record.isExpired(now): |
|
975 |
self.zeroconf.updateRecord(now, record) |
|
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 | 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 | 982 |
The listener object will have its addService() and |
983 |
removeService() methods called when this browser |
|
984 |
discovers changes in the services availability.""" |
|
7877
eba7f12b0c51
cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
7874
diff
changeset
|
985 |
|
28298 | 986 |
def __init__(self, zeroconf, type, listener): |
987 |
"""Creates a browser for a specific type""" |
|
988 |
threading.Thread.__init__(self) |
|
989 |
self.zeroconf = zeroconf |
|
990 |
self.type = type |
|
991 |
self.listener = listener |
|
992 |
self.services = {} |
|
28419
eb9d0e828c30
zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents:
28302
diff
changeset
|
993 |
self.nexttime = currentTimeMillis() |
28298 | 994 |
self.delay = _BROWSER_TIME |
995 |
self.list = [] |
|
7877
eba7f12b0c51
cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
7874
diff
changeset
|
996 |
|
28298 | 997 |
self.done = 0 |
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
998 |
|
28299 | 999 |
self.zeroconf.addListener(self, DNSQuestion(self.type, _TYPE_PTR, |
1000 |
_CLASS_IN)) |
|
28298 | 1001 |
self.start() |
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1002 |
|
28298 | 1003 |
def updateRecord(self, zeroconf, now, record): |
1004 |
"""Callback invoked by Zeroconf when new information arrives. |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1005 |
|
28298 | 1006 |
Updates information required by browser in the Zeroconf cache.""" |
1007 |
if record.type == _TYPE_PTR and record.name == self.type: |
|
1008 |
expired = record.isExpired(now) |
|
1009 |
try: |
|
1010 |
oldrecord = self.services[record.alias.lower()] |
|
1011 |
if not expired: |
|
1012 |
oldrecord.resetTTL(record) |
|
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 | 1015 |
callback = (lambda x: |
1016 |
self.listener.removeService(x, self.type, record.alias)) |
|
28298 | 1017 |
self.list.append(callback) |
1018 |
return |
|
1019 |
except Exception: |
|
1020 |
if not expired: |
|
1021 |
self.services[record.alias.lower()] = record |
|
28299 | 1022 |
callback = (lambda x: |
1023 |
self.listener.addService(x, self.type, record.alias)) |
|
28298 | 1024 |
self.list.append(callback) |
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1025 |
|
28298 | 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 | 1030 |
def cancel(self): |
1031 |
self.done = 1 |
|
1032 |
self.zeroconf.notifyAll() |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1033 |
|
28298 | 1034 |
def run(self): |
1035 |
while True: |
|
1036 |
event = None |
|
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 | 1040 |
if globals()['_GLOBAL_DONE'] or self.done: |
1041 |
return |
|
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 | 1045 |
out = DNSOutgoing(_FLAGS_QR_QUERY) |
1046 |
out.addQuestion(DNSQuestion(self.type, _TYPE_PTR, _CLASS_IN)) |
|
1047 |
for record in self.services.values(): |
|
1048 |
if not record.isExpired(now): |
|
1049 |
out.addAnswerAtTime(record, now) |
|
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 | 1052 |
self.delay = min(20 * 1000, self.delay * 2) |
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1053 |
|
28298 | 1054 |
if len(self.list) > 0: |
1055 |
event = self.list.pop(0) |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1056 |
|
28298 | 1057 |
if event is not None: |
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 | 1062 |
"""Service information""" |
7877
eba7f12b0c51
cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
7874
diff
changeset
|
1063 |
|
28299 | 1064 |
def __init__(self, type, name, address=None, port=None, weight=0, |
1065 |
priority=0, properties=None, server=None): |
|
28298 | 1066 |
"""Create a service description. |
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1067 |
|
28298 | 1068 |
type: fully qualified service type name |
1069 |
name: fully qualified service name |
|
1070 |
address: IP address as unsigned short, network byte order |
|
1071 |
port: port that the service runs on |
|
1072 |
weight: weight of the service |
|
1073 |
priority: priority of the service |
|
28299 | 1074 |
properties: dictionary of properties (or a string holding the bytes for |
1075 |
the text field) |
|
28298 | 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 | 1078 |
if not name.endswith(type): |
1079 |
raise BadTypeInNameException |
|
1080 |
self.type = type |
|
1081 |
self.name = name |
|
1082 |
self.address = address |
|
1083 |
self.port = port |
|
1084 |
self.weight = weight |
|
1085 |
self.priority = priority |
|
1086 |
if server: |
|
1087 |
self.server = server |
|
1088 |
else: |
|
1089 |
self.server = name |
|
1090 |
self.setProperties(properties) |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1091 |
|
28298 | 1092 |
def setProperties(self, properties): |
1093 |
"""Sets properties and text of this info from a dictionary""" |
|
1094 |
if isinstance(properties, dict): |
|
1095 |
self.properties = properties |
|
1096 |
list = [] |
|
1097 |
result = '' |
|
1098 |
for key in properties: |
|
1099 |
value = properties[key] |
|
1100 |
if value is None: |
|
1101 |
suffix = '' |
|
1102 |
elif isinstance(value, str): |
|
1103 |
suffix = value |
|
1104 |
elif isinstance(value, int): |
|
1105 |
if value: |
|
1106 |
suffix = 'true' |
|
1107 |
else: |
|
1108 |
suffix = 'false' |
|
1109 |
else: |
|
1110 |
suffix = '' |
|
1111 |
list.append('='.join((key, suffix))) |
|
1112 |
for item in list: |
|
28299 | 1113 |
result = ''.join((result, struct.pack('!c', chr(len(item))), |
1114 |
item)) |
|
28298 | 1115 |
self.text = result |
1116 |
else: |
|
1117 |
self.text = properties |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1118 |
|
28298 | 1119 |
def setText(self, text): |
1120 |
"""Sets properties and text given a text field""" |
|
1121 |
self.text = text |
|
1122 |
try: |
|
1123 |
result = {} |
|
1124 |
end = len(text) |
|
1125 |
index = 0 |
|
1126 |
strs = [] |
|
1127 |
while index < end: |
|
1128 |
length = ord(text[index]) |
|
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 | 1131 |
index += length |
7877
eba7f12b0c51
cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
7874
diff
changeset
|
1132 |
|
28298 | 1133 |
for s in strs: |
1134 |
eindex = s.find('=') |
|
1135 |
if eindex == -1: |
|
1136 |
# No equals sign at all |
|
1137 |
key = s |
|
1138 |
value = 0 |
|
1139 |
else: |
|
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 | 1142 |
if value == 'true': |
1143 |
value = 1 |
|
1144 |
elif value == 'false' or not value: |
|
1145 |
value = 0 |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1146 |
|
28298 | 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 | 1149 |
result[key] = value |
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1150 |
|
28298 | 1151 |
self.properties = result |
1152 |
except Exception: |
|
1153 |
traceback.print_exc() |
|
1154 |
self.properties = None |
|
7877
eba7f12b0c51
cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
7874
diff
changeset
|
1155 |
|
28298 | 1156 |
def getType(self): |
1157 |
"""Type accessor""" |
|
1158 |
return self.type |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1159 |
|
28298 | 1160 |
def getName(self): |
1161 |
"""Name accessor""" |
|
1162 |
if self.type is not None and self.name.endswith("." + self.type): |
|
1163 |
return self.name[:len(self.name) - len(self.type) - 1] |
|
1164 |
return self.name |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1165 |
|
28298 | 1166 |
def getAddress(self): |
1167 |
"""Address accessor""" |
|
1168 |
return self.address |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1169 |
|
28298 | 1170 |
def getPort(self): |
1171 |
"""Port accessor""" |
|
1172 |
return self.port |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1173 |
|
28298 | 1174 |
def getPriority(self): |
1175 |
"""Priority accessor""" |
|
1176 |
return self.priority |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1177 |
|
28298 | 1178 |
def getWeight(self): |
1179 |
"""Weight accessor""" |
|
1180 |
return self.weight |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1181 |
|
28298 | 1182 |
def getProperties(self): |
1183 |
"""Properties accessor""" |
|
1184 |
return self.properties |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1185 |
|
28298 | 1186 |
def getText(self): |
1187 |
"""Text accessor""" |
|
1188 |
return self.text |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1189 |
|
28298 | 1190 |
def getServer(self): |
1191 |
"""Server accessor""" |
|
1192 |
return self.server |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1193 |
|
28298 | 1194 |
def updateRecord(self, zeroconf, now, record): |
1195 |
"""Updates service information from a DNS record""" |
|
1196 |
if record is not None and not record.isExpired(now): |
|
1197 |
if record.type == _TYPE_A: |
|
1198 |
#if record.name == self.name: |
|
1199 |
if record.name == self.server: |
|
1200 |
self.address = record.address |
|
1201 |
elif record.type == _TYPE_SRV: |
|
1202 |
if record.name == self.name: |
|
1203 |
self.server = record.server |
|
1204 |
self.port = record.port |
|
1205 |
self.weight = record.weight |
|
1206 |
self.priority = record.priority |
|
1207 |
#self.address = None |
|
28299 | 1208 |
self.updateRecord(zeroconf, now, |
1209 |
zeroconf.cache.getByDetails(self.server, |
|
1210 |
_TYPE_A, _CLASS_IN)) |
|
28298 | 1211 |
elif record.type == _TYPE_TXT: |
1212 |
if record.name == self.name: |
|
1213 |
self.setText(record.text) |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1214 |
|
28298 | 1215 |
def request(self, zeroconf, timeout): |
1216 |
"""Returns true if the service could be discovered on the |
|
1217 |
network, and updates this object with details discovered. |
|
1218 |
""" |
|
1219 |
now = currentTimeMillis() |
|
1220 |
delay = _LISTENER_TIME |
|
1221 |
next = now + delay |
|
1222 |
last = now + timeout |
|
1223 |
result = 0 |
|
1224 |
try: |
|
28299 | 1225 |
zeroconf.addListener(self, DNSQuestion(self.name, _TYPE_ANY, |
1226 |
_CLASS_IN)) |
|
1227 |
while (self.server is None or self.address is None or |
|
1228 |
self.text is None): |
|
28298 | 1229 |
if last <= now: |
1230 |
return 0 |
|
1231 |
if next <= now: |
|
1232 |
out = DNSOutgoing(_FLAGS_QR_QUERY) |
|
28299 | 1233 |
out.addQuestion(DNSQuestion(self.name, _TYPE_SRV, |
1234 |
_CLASS_IN)) |
|
1235 |
out.addAnswerAtTime( |
|
1236 |
zeroconf.cache.getByDetails(self.name, |
|
1237 |
_TYPE_SRV, |
|
1238 |
_CLASS_IN), |
|
1239 |
now) |
|
1240 |
out.addQuestion(DNSQuestion(self.name, _TYPE_TXT, |
|
1241 |
_CLASS_IN)) |
|
1242 |
out.addAnswerAtTime( |
|
1243 |
zeroconf.cache.getByDetails(self.name, _TYPE_TXT, |
|
1244 |
_CLASS_IN), |
|
1245 |
now) |
|
28298 | 1246 |
if self.server is not None: |
28299 | 1247 |
out.addQuestion( |
1248 |
DNSQuestion(self.server, _TYPE_A, _CLASS_IN)) |
|
1249 |
out.addAnswerAtTime( |
|
1250 |
zeroconf.cache.getByDetails(self.server, _TYPE_A, |
|
1251 |
_CLASS_IN), |
|
1252 |
now) |
|
28298 | 1253 |
zeroconf.send(out) |
1254 |
next = now + delay |
|
1255 |
delay = delay * 2 |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1256 |
|
28298 | 1257 |
zeroconf.wait(min(next, last) - now) |
1258 |
now = currentTimeMillis() |
|
1259 |
result = 1 |
|
1260 |
finally: |
|
1261 |
zeroconf.removeListener(self) |
|
7877
eba7f12b0c51
cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
7874
diff
changeset
|
1262 |
|
28298 | 1263 |
return result |
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1264 |
|
28298 | 1265 |
def __eq__(self, other): |
1266 |
"""Tests equality of service name""" |
|
1267 |
if isinstance(other, ServiceInfo): |
|
1268 |
return other.name == self.name |
|
1269 |
return 0 |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1270 |
|
28298 | 1271 |
def __ne__(self, other): |
1272 |
"""Non-equality test""" |
|
1273 |
return not self.__eq__(other) |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1274 |
|
28298 | 1275 |
def __repr__(self): |
1276 |
"""String representation""" |
|
28299 | 1277 |
result = ("service[%s,%s:%s," % |
1278 |
(self.name, socket.inet_ntoa(self.getAddress()), self.port)) |
|
28298 | 1279 |
if self.text is None: |
1280 |
result += "None" |
|
1281 |
else: |
|
1282 |
if len(self.text) < 20: |
|
1283 |
result += self.text |
|
1284 |
else: |
|
1285 |
result += self.text[:17] + "..." |
|
1286 |
result += "]" |
|
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 | 1291 |
"""Implementation of Zeroconf Multicast DNS Service Discovery |
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1292 |
|
28298 | 1293 |
Supports registration, unregistration, queries and browsing. |
1294 |
""" |
|
1295 |
def __init__(self, bindaddress=None): |
|
1296 |
"""Creates an instance of the Zeroconf class, establishing |
|
1297 |
multicast communications, listening and reaping threads.""" |
|
1298 |
globals()['_GLOBAL_DONE'] = 0 |
|
1299 |
if bindaddress is None: |
|
1300 |
self.intf = socket.gethostbyname(socket.gethostname()) |
|
1301 |
else: |
|
1302 |
self.intf = bindaddress |
|
1303 |
self.group = ('', _MDNS_PORT) |
|
1304 |
self.socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) |
|
1305 |
try: |
|
1306 |
self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) |
|
1307 |
self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1) |
|
1308 |
except Exception: |
|
1309 |
# SO_REUSEADDR should be equivalent to SO_REUSEPORT for |
|
1310 |
# multicast UDP sockets (p 731, "TCP/IP Illustrated, |
|
1311 |
# Volume 2"), but some BSD-derived systems require |
|
1312 |
# SO_REUSEPORT to be specified explicitly. Also, not all |
|
1313 |
# versions of Python have SO_REUSEPORT available. So |
|
1314 |
# if you're on a BSD-based system, and haven't upgraded |
|
1315 |
# to Python 2.3 yet, you may find this library doesn't |
|
1316 |
# work as expected. |
|
1317 |
# |
|
1318 |
pass |
|
1319 |
self.socket.setsockopt(socket.SOL_IP, socket.IP_MULTICAST_TTL, "\xff") |
|
1320 |
self.socket.setsockopt(socket.SOL_IP, socket.IP_MULTICAST_LOOP, "\x01") |
|
1321 |
try: |
|
1322 |
self.socket.bind(self.group) |
|
1323 |
except Exception: |
|
1324 |
# Some versions of linux raise an exception even though |
|
1325 |
# SO_REUSEADDR and SO_REUSEPORT have been set, so ignore it |
|
1326 |
pass |
|
28299 | 1327 |
self.socket.setsockopt(socket.SOL_IP, socket.IP_ADD_MEMBERSHIP, |
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 | 1330 |
self.listeners = [] |
1331 |
self.browsers = [] |
|
1332 |
self.services = {} |
|
1333 |
self.servicetypes = {} |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1334 |
|
28298 | 1335 |
self.cache = DNSCache() |
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1336 |
|
28298 | 1337 |
self.condition = threading.Condition() |
7877
eba7f12b0c51
cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
7874
diff
changeset
|
1338 |
|
28298 | 1339 |
self.engine = Engine(self) |
1340 |
self.listener = Listener(self) |
|
1341 |
self.reaper = Reaper(self) |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1342 |
|
28298 | 1343 |
def isLoopback(self): |
1344 |
return self.intf.startswith("127.0.0.1") |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1345 |
|
28298 | 1346 |
def isLinklocal(self): |
1347 |
return self.intf.startswith("169.254.") |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1348 |
|
28298 | 1349 |
def wait(self, timeout): |
1350 |
"""Calling thread waits for a given number of milliseconds or |
|
1351 |
until notified.""" |
|
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 | 1354 |
self.condition.release() |
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1355 |
|
28298 | 1356 |
def notifyAll(self): |
1357 |
"""Notifies all waiting threads""" |
|
1358 |
self.condition.acquire() |
|
1359 |
self.condition.notifyAll() |
|
1360 |
self.condition.release() |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1361 |
|
28298 | 1362 |
def getServiceInfo(self, type, name, timeout=3000): |
1363 |
"""Returns network's service information for a particular |
|
1364 |
name and type, or None if no service matches by the timeout, |
|
1365 |
which defaults to 3 seconds.""" |
|
1366 |
info = ServiceInfo(type, name) |
|
1367 |
if info.request(self, timeout): |
|
1368 |
return info |
|
1369 |
return None |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1370 |
|
28298 | 1371 |
def addServiceListener(self, type, listener): |
1372 |
"""Adds a listener for a particular service type. This object |
|
1373 |
will then have its updateRecord method called when information |
|
1374 |
arrives for that type.""" |
|
1375 |
self.removeServiceListener(listener) |
|
1376 |
self.browsers.append(ServiceBrowser(self, type, listener)) |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1377 |
|
28298 | 1378 |
def removeServiceListener(self, listener): |
1379 |
"""Removes a listener from the set that is currently listening.""" |
|
1380 |
for browser in self.browsers: |
|
1381 |
if browser.listener == listener: |
|
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 | 1385 |
def registerService(self, info, ttl=_DNS_TTL): |
1386 |
"""Registers service information to the network with a default TTL |
|
1387 |
of 60 seconds. Zeroconf will then respond to requests for |
|
1388 |
information for that service. The name of the service may be |
|
1389 |
changed if needed to make it unique on the network.""" |
|
1390 |
self.checkService(info) |
|
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 | 1394 |
else: |
28300
15c5f50e7e13
zeroconf: add whitespace around operator
timeless <timeless@mozdev.org>
parents:
28299
diff
changeset
|
1395 |
self.servicetypes[info.type] = 1 |
28298 | 1396 |
now = currentTimeMillis() |
28419
eb9d0e828c30
zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents:
28302
diff
changeset
|
1397 |
nexttime = now |
28298 | 1398 |
i = 0 |
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 | 1402 |
now = currentTimeMillis() |
1403 |
continue |
|
1404 |
out = DNSOutgoing(_FLAGS_QR_RESPONSE | _FLAGS_AA) |
|
28299 | 1405 |
out.addAnswerAtTime(DNSPointer(info.type, _TYPE_PTR, |
1406 |
_CLASS_IN, ttl, info.name), 0) |
|
1407 |
out.addAnswerAtTime( |
|
1408 |
DNSService( |
|
1409 |
info.name, _TYPE_SRV, |
|
1410 |
_CLASS_IN, ttl, info.priority, info.weight, info.port, |
|
1411 |
info.server), |
|
1412 |
0) |
|
1413 |
out.addAnswerAtTime( |
|
1414 |
DNSText(info.name, _TYPE_TXT, _CLASS_IN, ttl, info.text), |
|
1415 |
0) |
|
28298 | 1416 |
if info.address: |
28299 | 1417 |
out.addAnswerAtTime(DNSAddress(info.server, _TYPE_A, |
1418 |
_CLASS_IN, ttl, info.address), 0) |
|
28298 | 1419 |
self.send(out) |
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 | 1423 |
def unregisterService(self, info): |
1424 |
"""Unregister a service.""" |
|
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 | 1429 |
else: |
1430 |
del self.servicetypes[info.type] |
|
1431 |
except KeyError: |
|
1432 |
pass |
|
1433 |
now = currentTimeMillis() |
|
28419
eb9d0e828c30
zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents:
28302
diff
changeset
|
1434 |
nexttime = now |
28298 | 1435 |
i = 0 |
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 | 1439 |
now = currentTimeMillis() |
1440 |
continue |
|
1441 |
out = DNSOutgoing(_FLAGS_QR_RESPONSE | _FLAGS_AA) |
|
28299 | 1442 |
out.addAnswerAtTime( |
1443 |
DNSPointer(info.type, _TYPE_PTR, _CLASS_IN, 0, info.name), 0) |
|
1444 |
out.addAnswerAtTime( |
|
1445 |
DNSService(info.name, _TYPE_SRV, |
|
1446 |
_CLASS_IN, 0, info.priority, info.weight, info.port, |
|
1447 |
info.name), |
|
1448 |
0) |
|
1449 |
out.addAnswerAtTime(DNSText(info.name, _TYPE_TXT, |
|
1450 |
_CLASS_IN, 0, info.text), 0) |
|
28298 | 1451 |
if info.address: |
28299 | 1452 |
out.addAnswerAtTime(DNSAddress(info.server, _TYPE_A, |
1453 |
_CLASS_IN, 0, info.address), 0) |
|
28298 | 1454 |
self.send(out) |
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 | 1458 |
def unregisterAllServices(self): |
1459 |
"""Unregister all registered services.""" |
|
1460 |
if len(self.services) > 0: |
|
1461 |
now = currentTimeMillis() |
|
28419
eb9d0e828c30
zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents:
28302
diff
changeset
|
1462 |
nexttime = now |
28298 | 1463 |
i = 0 |
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 | 1467 |
now = currentTimeMillis() |
1468 |
continue |
|
1469 |
out = DNSOutgoing(_FLAGS_QR_RESPONSE | _FLAGS_AA) |
|
1470 |
for info in self.services.values(): |
|
28299 | 1471 |
out.addAnswerAtTime(DNSPointer(info.type, _TYPE_PTR, |
1472 |
_CLASS_IN, 0, info.name), 0) |
|
1473 |
out.addAnswerAtTime( |
|
1474 |
DNSService(info.name, _TYPE_SRV, |
|
1475 |
_CLASS_IN, 0, info.priority, info.weight, |
|
1476 |
info.port, info.server), |
|
1477 |
0) |
|
1478 |
out.addAnswerAtTime(DNSText(info.name, _TYPE_TXT, |
|
1479 |
_CLASS_IN, 0, info.text), 0) |
|
28298 | 1480 |
if info.address: |
28299 | 1481 |
out.addAnswerAtTime(DNSAddress(info.server, _TYPE_A, |
1482 |
_CLASS_IN, 0, info.address), 0) |
|
28298 | 1483 |
self.send(out) |
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 | 1487 |
def checkService(self, info): |
1488 |
"""Checks the network for a unique service name, modifying the |
|
1489 |
ServiceInfo passed in if it is not unique.""" |
|
1490 |
now = currentTimeMillis() |
|
28419
eb9d0e828c30
zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents:
28302
diff
changeset
|
1491 |
nexttime = now |
28298 | 1492 |
i = 0 |
1493 |
while i < 3: |
|
1494 |
for record in self.cache.entriesWithName(info.type): |
|
28299 | 1495 |
if (record.type == _TYPE_PTR and not record.isExpired(now) and |
1496 |
record.alias == info.name): |
|
28298 | 1497 |
if (info.name.find('.') < 0): |
28299 | 1498 |
info.name = ("%w.[%s:%d].%s" % |
1499 |
(info.name, info.address, info.port, info.type)) |
|
28298 | 1500 |
self.checkService(info) |
1501 |
return |
|
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 | 1505 |
now = currentTimeMillis() |
1506 |
continue |
|
1507 |
out = DNSOutgoing(_FLAGS_QR_QUERY | _FLAGS_AA) |
|
1508 |
self.debug = out |
|
1509 |
out.addQuestion(DNSQuestion(info.type, _TYPE_PTR, _CLASS_IN)) |
|
28299 | 1510 |
out.addAuthoritativeAnswer(DNSPointer(info.type, _TYPE_PTR, |
1511 |
_CLASS_IN, _DNS_TTL, info.name)) |
|
28298 | 1512 |
self.send(out) |
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 | 1516 |
def addListener(self, listener, question): |
1517 |
"""Adds a listener for a given question. The listener will have |
|
1518 |
its updateRecord method called when information is available to |
|
1519 |
answer the question.""" |
|
1520 |
now = currentTimeMillis() |
|
1521 |
self.listeners.append(listener) |
|
1522 |
if question is not None: |
|
1523 |
for record in self.cache.entriesWithName(question.name): |
|
1524 |
if question.answeredBy(record) and not record.isExpired(now): |
|
1525 |
listener.updateRecord(self, now, record) |
|
1526 |
self.notifyAll() |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1527 |
|
28298 | 1528 |
def removeListener(self, listener): |
1529 |
"""Removes a listener.""" |
|
1530 |
try: |
|
1531 |
self.listeners.remove(listener) |
|
1532 |
self.notifyAll() |
|
1533 |
except Exception: |
|
1534 |
pass |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1535 |
|
28298 | 1536 |
def updateRecord(self, now, rec): |
1537 |
"""Used to notify listeners of new information that has updated |
|
1538 |
a record.""" |
|
1539 |
for listener in self.listeners: |
|
1540 |
listener.updateRecord(self, now, rec) |
|
1541 |
self.notifyAll() |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1542 |
|
28298 | 1543 |
def handleResponse(self, msg): |
1544 |
"""Deal with incoming response packets. All answers |
|
1545 |
are held in the cache, and listeners are notified.""" |
|
1546 |
now = currentTimeMillis() |
|
1547 |
for record in msg.answers: |
|
1548 |
expired = record.isExpired(now) |
|
1549 |
if record in self.cache.entries(): |
|
1550 |
if expired: |
|
1551 |
self.cache.remove(record) |
|
1552 |
else: |
|
1553 |
entry = self.cache.get(record) |
|
1554 |
if entry is not None: |
|
1555 |
entry.resetTTL(record) |
|
1556 |
record = entry |
|
1557 |
else: |
|
1558 |
self.cache.add(record) |
|
7877
eba7f12b0c51
cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
7874
diff
changeset
|
1559 |
|
28298 | 1560 |
self.updateRecord(now, record) |
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1561 |
|
28298 | 1562 |
def handleQuery(self, msg, addr, port): |
1563 |
"""Deal with incoming query packets. Provides a response if |
|
1564 |
possible.""" |
|
1565 |
out = None |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1566 |
|
28298 | 1567 |
# Support unicast client responses |
1568 |
# |
|
1569 |
if port != _MDNS_PORT: |
|
1570 |
out = DNSOutgoing(_FLAGS_QR_RESPONSE | _FLAGS_AA, 0) |
|
1571 |
for question in msg.questions: |
|
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 | 1574 |
for question in msg.questions: |
1575 |
if question.type == _TYPE_PTR: |
|
1576 |
if question.name == "_services._dns-sd._udp.local.": |
|
1577 |
for stype in self.servicetypes.keys(): |
|
1578 |
if out is None: |
|
1579 |
out = DNSOutgoing(_FLAGS_QR_RESPONSE | _FLAGS_AA) |
|
28299 | 1580 |
out.addAnswer(msg, |
1581 |
DNSPointer( |
|
1582 |
"_services._dns-sd._udp.local.", |
|
1583 |
_TYPE_PTR, _CLASS_IN, |
|
1584 |
_DNS_TTL, stype)) |
|
28298 | 1585 |
for service in self.services.values(): |
1586 |
if question.name == service.type: |
|
1587 |
if out is None: |
|
1588 |
out = DNSOutgoing(_FLAGS_QR_RESPONSE | _FLAGS_AA) |
|
28299 | 1589 |
out.addAnswer(msg, DNSPointer(service.type, _TYPE_PTR, |
1590 |
_CLASS_IN, _DNS_TTL, service.name)) |
|
28298 | 1591 |
else: |
1592 |
try: |
|
1593 |
if out is None: |
|
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 | 1596 |
# Answer A record queries for any service addresses we know |
1597 |
if question.type == _TYPE_A or question.type == _TYPE_ANY: |
|
1598 |
for service in self.services.values(): |
|
1599 |
if service.server == question.name.lower(): |
|
28299 | 1600 |
out.addAnswer(msg, |
1601 |
DNSAddress(question.name, _TYPE_A, |
|
1602 |
_CLASS_IN | _CLASS_UNIQUE, |
|
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 | 1605 |
service = self.services.get(question.name.lower(), None) |
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 | 1608 |
if (question.type == _TYPE_SRV or |
1609 |
question.type == _TYPE_ANY): |
|
1610 |
out.addAnswer(msg, |
|
1611 |
DNSService(question.name, _TYPE_SRV, |
|
1612 |
_CLASS_IN | _CLASS_UNIQUE, |
|
1613 |
_DNS_TTL, service.priority, |
|
1614 |
service.weight, service.port, |
|
1615 |
service.server)) |
|
1616 |
if (question.type == _TYPE_TXT or |
|
1617 |
question.type == _TYPE_ANY): |
|
1618 |
out.addAnswer(msg, DNSText(question.name, _TYPE_TXT, |
|
1619 |
_CLASS_IN | _CLASS_UNIQUE, _DNS_TTL, service.text)) |
|
28298 | 1620 |
if question.type == _TYPE_SRV: |
28299 | 1621 |
out.addAdditionalAnswer( |
1622 |
DNSAddress(service.server, _TYPE_A, |
|
1623 |
_CLASS_IN | _CLASS_UNIQUE, |
|
1624 |
_DNS_TTL, service.address)) |
|
28298 | 1625 |
except Exception: |
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 | 1628 |
if out is not None and out.answers: |
1629 |
out.id = msg.id |
|
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 | 1633 |
"""Sends an outgoing packet.""" |
1634 |
# This is a quick test to see if we can parse the packets we generate |
|
1635 |
#temp = DNSIncoming(out.packet()) |
|
1636 |
try: |
|
1637 |
self.socket.sendto(out.packet(), 0, (addr, port)) |
|
1638 |
except Exception: |
|
1639 |
# Ignore this, it may be a temporary loss of network connection |
|
1640 |
pass |
|
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1641 |
|
28298 | 1642 |
def close(self): |
1643 |
"""Ends the background threads, and prevent this instance from |
|
1644 |
servicing further queries.""" |
|
1645 |
if globals()['_GLOBAL_DONE'] == 0: |
|
1646 |
globals()['_GLOBAL_DONE'] = 1 |
|
1647 |
self.notifyAll() |
|
1648 |
self.engine.notify() |
|
1649 |
self.unregisterAllServices() |
|
28299 | 1650 |
self.socket.setsockopt(socket.SOL_IP, socket.IP_DROP_MEMBERSHIP, |
1651 |
socket.inet_aton(_MDNS_ADDR) + socket.inet_aton('0.0.0.0')) |
|
28298 | 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 | 1658 |
print("Multicast DNS Service Discovery for Python, version", __version__) |
1659 |
r = Zeroconf() |
|
1660 |
print("1. Testing registration of a service...") |
|
1661 |
desc = {'version':'0.10','a':'test value', 'b':'another value'} |
|
28299 | 1662 |
info = ServiceInfo("_http._tcp.local.", |
1663 |
"My Service Name._http._tcp.local.", |
|
1664 |
socket.inet_aton("127.0.0.1"), 1234, 0, 0, desc) |
|
28298 | 1665 |
print(" Registering service...") |
1666 |
r.registerService(info) |
|
1667 |
print(" Registration done.") |
|
1668 |
print("2. Testing query of service information...") |
|
28299 | 1669 |
print(" Getting ZOE service:", |
1670 |
str(r.getServiceInfo("_http._tcp.local.", "ZOE._http._tcp.local."))) |
|
28298 | 1671 |
print(" Query done.") |
1672 |
print("3. Testing query of own service...") |
|
28299 | 1673 |
print(" Getting self:", |
1674 |
str(r.getServiceInfo("_http._tcp.local.", |
|
1675 |
"My Service Name._http._tcp.local."))) |
|
28298 | 1676 |
print(" Query done.") |
1677 |
print("4. Testing unregister of service information...") |
|
1678 |
r.unregisterService(info) |
|
1679 |
print(" Unregister done.") |
|
1680 |
r.close() |