Mercurial > hg
annotate hgext/zeroconf/Zeroconf.py @ 48875:6000f5b25c9b
py2: remove simple from __future__ statements
These were needed for Python 2 support. Now that our linter no longer
mandates these, we can start deleting them.
Differential Revision: https://phab.mercurial-scm.org/D12254
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Thu, 03 Mar 2022 17:34:00 +0100 |
parents | ad2c37075f46 |
children | 642e31cb55f0 |
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1 """ Multicast DNS Service Discovery for Python, v0.12 |
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2 Copyright (C) 2003, Paul Scott-Murphy |
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3 |
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4 This module provides a framework for the use of DNS Service Discovery |
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5 using IP multicast. It has been tested against the JRendezvous |
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6 implementation from <a href="http://strangeberry.com">StrangeBerry</a>, |
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7 and against the mDNSResponder from Mac OS X 10.3.8. |
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8 |
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9 This library is free software; you can redistribute it and/or |
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10 modify it under the terms of the GNU Lesser General Public |
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11 License as published by the Free Software Foundation; either |
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12 version 2.1 of the License, or (at your option) any later version. |
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13 |
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14 This library is distributed in the hope that it will be useful, |
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15 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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17 Lesser General Public License for more details. |
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18 |
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19 You should have received a copy of the GNU Lesser General Public |
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20 License along with this library; if not, see |
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21 <http://www.gnu.org/licenses/>. |
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22 |
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23 """ |
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24 |
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25 """0.12 update - allow selection of binding interface |
28298 | 26 typo fix - Thanks A. M. Kuchlingi |
27 removed all use of word 'Rendezvous' - this is an API change""" | |
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28 |
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29 """0.11 update - correction to comments for addListener method |
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30 support for new record types seen from OS X |
28298 | 31 - IPv6 address |
32 - hostinfo | |
33 ignore unknown DNS record types | |
34 fixes to name decoding | |
28299 | 35 works alongside other processes using port 5353 (e.g. Mac OS X) |
28298 | 36 tested against Mac OS X 10.3.2's mDNSResponder |
37 corrections to removal of list entries for service browser""" | |
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38 |
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39 """0.10 update - Jonathon Paisley contributed these corrections: |
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40 always multicast replies, even when query is unicast |
28298 | 41 correct a pointer encoding problem |
42 can now write records in any order | |
43 traceback shown on failure | |
44 better TXT record parsing | |
45 server is now separate from name | |
46 can cancel a service browser | |
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47 |
28298 | 48 modified some unit tests to accommodate these changes""" |
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49 |
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50 """0.09 update - remove all records on service unregistration |
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51 fix DOS security problem with readName""" |
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52 |
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53 """0.08 update - changed licensing to LGPL""" |
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54 |
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55 """0.07 update - faster shutdown on engine |
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56 pointer encoding of outgoing names |
28298 | 57 ServiceBrowser now works |
58 new unit tests""" | |
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59 |
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60 """0.06 update - small improvements with unit tests |
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61 added defined exception types |
28298 | 62 new style objects |
63 fixed hostname/interface problem | |
64 fixed socket timeout problem | |
65 fixed addServiceListener() typo bug | |
66 using select() for socket reads | |
67 tested on Debian unstable with Python 2.2.2""" | |
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68 |
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69 """0.05 update - ensure case insensitivity on domain names |
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70 support for unicast DNS queries""" |
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71 |
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72 """0.04 update - added some unit tests |
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73 added __ne__ adjuncts where required |
28298 | 74 ensure names end in '.local.' |
75 timeout on receiving socket for clean shutdown""" | |
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76 |
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77 __author__ = b"Paul Scott-Murphy" |
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78 __email__ = b"paul at scott dash murphy dot com" |
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79 __version__ = b"0.12" |
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80 |
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81 import errno |
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82 import itertools |
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83 import select |
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84 import socket |
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85 import struct |
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86 import threading |
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87 import time |
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88 import traceback |
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89 |
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90 from mercurial import pycompat |
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91 |
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92 __all__ = [b"Zeroconf", b"ServiceInfo", b"ServiceBrowser"] |
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93 |
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94 # hook for threads |
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95 |
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96 globals()[b'_GLOBAL_DONE'] = 0 |
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97 |
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98 # Some timing constants |
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99 |
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100 _UNREGISTER_TIME = 125 |
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101 _CHECK_TIME = 175 |
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102 _REGISTER_TIME = 225 |
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103 _LISTENER_TIME = 200 |
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104 _BROWSER_TIME = 500 |
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105 |
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106 # Some DNS constants |
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107 |
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108 _MDNS_ADDR = r'224.0.0.251' |
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110 _DNS_PORT = 53 | |
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111 _DNS_TTL = 60 * 60 # one hour default TTL |
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112 |
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113 _MAX_MSG_TYPICAL = 1460 # unused |
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114 _MAX_MSG_ABSOLUTE = 8972 |
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115 |
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116 _FLAGS_QR_MASK = 0x8000 # query response mask |
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117 _FLAGS_QR_QUERY = 0x0000 # query |
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118 _FLAGS_QR_RESPONSE = 0x8000 # response |
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119 |
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120 _FLAGS_AA = 0x0400 # Authoritative answer |
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121 _FLAGS_TC = 0x0200 # Truncated |
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122 _FLAGS_RD = 0x0100 # Recursion desired |
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123 _FLAGS_RA = 0x8000 # Recursion available |
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124 |
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125 _FLAGS_Z = 0x0040 # Zero |
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126 _FLAGS_AD = 0x0020 # Authentic data |
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127 _FLAGS_CD = 0x0010 # Checking disabled |
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128 |
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129 _CLASS_IN = 1 |
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130 _CLASS_CS = 2 |
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131 _CLASS_CH = 3 |
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132 _CLASS_HS = 4 |
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133 _CLASS_NONE = 254 |
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134 _CLASS_ANY = 255 |
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135 _CLASS_MASK = 0x7FFF |
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136 _CLASS_UNIQUE = 0x8000 |
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137 |
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138 _TYPE_A = 1 |
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139 _TYPE_NS = 2 |
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140 _TYPE_MD = 3 |
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141 _TYPE_MF = 4 |
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142 _TYPE_CNAME = 5 |
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143 _TYPE_SOA = 6 |
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144 _TYPE_MB = 7 |
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145 _TYPE_MG = 8 |
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146 _TYPE_MR = 9 |
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147 _TYPE_NULL = 10 |
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148 _TYPE_WKS = 11 |
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149 _TYPE_PTR = 12 |
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150 _TYPE_HINFO = 13 |
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151 _TYPE_MINFO = 14 |
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152 _TYPE_MX = 15 |
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153 _TYPE_TXT = 16 |
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154 _TYPE_AAAA = 28 |
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155 _TYPE_SRV = 33 |
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156 _TYPE_ANY = 255 |
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157 |
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158 # Mapping constants to names |
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159 |
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160 _CLASSES = { |
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161 _CLASS_IN: b"in", |
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162 _CLASS_CS: b"cs", |
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163 _CLASS_CH: b"ch", |
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164 _CLASS_HS: b"hs", |
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165 _CLASS_NONE: b"none", |
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166 _CLASS_ANY: b"any", |
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167 } |
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168 |
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169 _TYPES = { |
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170 _TYPE_A: b"a", |
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171 _TYPE_NS: b"ns", |
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172 _TYPE_MD: b"md", |
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173 _TYPE_MF: b"mf", |
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174 _TYPE_CNAME: b"cname", |
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175 _TYPE_SOA: b"soa", |
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176 _TYPE_MB: b"mb", |
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177 _TYPE_MG: b"mg", |
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178 _TYPE_MR: b"mr", |
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179 _TYPE_NULL: b"null", |
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180 _TYPE_WKS: b"wks", |
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181 _TYPE_PTR: b"ptr", |
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182 _TYPE_HINFO: b"hinfo", |
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183 _TYPE_MINFO: b"minfo", |
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184 _TYPE_MX: b"mx", |
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185 _TYPE_TXT: b"txt", |
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186 _TYPE_AAAA: b"quada", |
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187 _TYPE_SRV: b"srv", |
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188 _TYPE_ANY: b"any", |
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189 } |
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190 |
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191 # utility functions |
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192 |
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193 |
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194 def currentTimeMillis(): |
28298 | 195 """Current system time in milliseconds""" |
196 return time.time() * 1000 | |
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197 |
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198 |
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199 # Exceptions |
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200 |
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201 |
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202 class NonLocalNameException(Exception): |
28298 | 203 pass |
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204 |
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205 |
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206 class NonUniqueNameException(Exception): |
28298 | 207 pass |
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208 |
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209 |
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210 class NamePartTooLongException(Exception): |
28298 | 211 pass |
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212 |
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213 |
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214 class AbstractMethodException(Exception): |
28298 | 215 pass |
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216 |
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217 |
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218 class BadTypeInNameException(Exception): |
28298 | 219 pass |
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220 |
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221 |
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222 class BadDomainName(Exception): |
28298 | 223 def __init__(self, pos): |
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224 Exception.__init__(self, b"at position %s" % pos) |
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225 |
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226 |
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227 class BadDomainNameCircular(BadDomainName): |
28298 | 228 pass |
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229 |
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230 |
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231 # implementation classes |
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232 |
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233 |
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234 class DNSEntry(object): |
28298 | 235 """A DNS entry""" |
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236 |
28298 | 237 def __init__(self, name, type, clazz): |
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238 self.key = name.lower() |
28298 | 239 self.name = name |
240 self.type = type | |
241 self.clazz = clazz & _CLASS_MASK | |
242 self.unique = (clazz & _CLASS_UNIQUE) != 0 | |
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243 |
28298 | 244 def __eq__(self, other): |
245 """Equality test on name, type, and class""" | |
246 if isinstance(other, DNSEntry): | |
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247 return ( |
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248 self.name == other.name |
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249 and self.type == other.type |
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250 and self.clazz == other.clazz |
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251 ) |
28298 | 252 return 0 |
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253 |
28298 | 254 def __ne__(self, other): |
255 """Non-equality test""" | |
256 return not self.__eq__(other) | |
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257 |
28298 | 258 def getClazz(self, clazz): |
259 """Class accessor""" | |
260 try: | |
261 return _CLASSES[clazz] | |
262 except KeyError: | |
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263 return b"?(%s)" % clazz |
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264 |
28298 | 265 def getType(self, type): |
266 """Type accessor""" | |
267 try: | |
268 return _TYPES[type] | |
269 except KeyError: | |
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270 return b"?(%s)" % type |
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271 |
28298 | 272 def toString(self, hdr, other): |
273 """String representation with additional information""" | |
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274 result = b"%s[%s,%s" % ( |
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275 hdr, |
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276 self.getType(self.type), |
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277 self.getClazz(self.clazz), |
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278 ) |
28298 | 279 if self.unique: |
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280 result += b"-unique," |
28298 | 281 else: |
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282 result += b"," |
28298 | 283 result += self.name |
284 if other is not None: | |
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285 result += b",%s]" % other |
28298 | 286 else: |
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287 result += b"]" |
28298 | 288 return result |
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289 |
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290 |
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291 class DNSQuestion(DNSEntry): |
28298 | 292 """A DNS question entry""" |
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293 |
28298 | 294 def __init__(self, name, type, clazz): |
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295 if pycompat.ispy3 and isinstance(name, str): |
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296 name = name.encode('ascii') |
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297 if not name.endswith(b".local."): |
28298 | 298 raise NonLocalNameException(name) |
299 DNSEntry.__init__(self, name, type, clazz) | |
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300 |
28298 | 301 def answeredBy(self, rec): |
302 """Returns true if the question is answered by the record""" | |
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303 return ( |
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304 self.clazz == rec.clazz |
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305 and (self.type == rec.type or self.type == _TYPE_ANY) |
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306 and self.name == rec.name |
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307 ) |
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308 |
28298 | 309 def __repr__(self): |
310 """String representation""" | |
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311 return DNSEntry.toString(self, b"question", None) |
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312 |
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313 |
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314 class DNSRecord(DNSEntry): |
28298 | 315 """A DNS record - like a DNS entry, but has a TTL""" |
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316 |
28298 | 317 def __init__(self, name, type, clazz, ttl): |
318 DNSEntry.__init__(self, name, type, clazz) | |
319 self.ttl = ttl | |
320 self.created = currentTimeMillis() | |
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321 |
28298 | 322 def __eq__(self, other): |
323 """Tests equality as per DNSRecord""" | |
324 if isinstance(other, DNSRecord): | |
325 return DNSEntry.__eq__(self, other) | |
326 return 0 | |
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327 |
28298 | 328 def suppressedBy(self, msg): |
329 """Returns true if any answer in a message can suffice for the | |
330 information held in this record.""" | |
331 for record in msg.answers: | |
332 if self.suppressedByAnswer(record): | |
333 return 1 | |
334 return 0 | |
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335 |
28298 | 336 def suppressedByAnswer(self, other): |
337 """Returns true if another record has same name, type and class, | |
338 and if its TTL is at least half of this record's.""" | |
339 if self == other and other.ttl > (self.ttl / 2): | |
340 return 1 | |
341 return 0 | |
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342 |
28298 | 343 def getExpirationTime(self, percent): |
344 """Returns the time at which this record will have expired | |
345 by a certain percentage.""" | |
346 return self.created + (percent * self.ttl * 10) | |
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347 |
28298 | 348 def getRemainingTTL(self, now): |
349 """Returns the remaining TTL in seconds.""" | |
350 return max(0, (self.getExpirationTime(100) - now) / 1000) | |
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351 |
28298 | 352 def isExpired(self, now): |
353 """Returns true if this record has expired.""" | |
354 return self.getExpirationTime(100) <= now | |
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355 |
28298 | 356 def isStale(self, now): |
357 """Returns true if this record is at least half way expired.""" | |
358 return self.getExpirationTime(50) <= now | |
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359 |
28298 | 360 def resetTTL(self, other): |
361 """Sets this record's TTL and created time to that of | |
362 another record.""" | |
363 self.created = other.created | |
364 self.ttl = other.ttl | |
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365 |
28298 | 366 def write(self, out): |
367 """Abstract method""" | |
368 raise AbstractMethodException | |
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369 |
28298 | 370 def toString(self, other): |
371 """String representation with additional information""" | |
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372 arg = b"%s/%s,%s" % ( |
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373 self.ttl, |
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374 self.getRemainingTTL(currentTimeMillis()), |
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375 other, |
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376 ) |
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377 return DNSEntry.toString(self, b"record", arg) |
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378 |
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379 |
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380 class DNSAddress(DNSRecord): |
28298 | 381 """A DNS address record""" |
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382 |
28298 | 383 def __init__(self, name, type, clazz, ttl, address): |
384 DNSRecord.__init__(self, name, type, clazz, ttl) | |
385 self.address = address | |
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386 |
28298 | 387 def write(self, out): |
388 """Used in constructing an outgoing packet""" | |
389 out.writeString(self.address, len(self.address)) | |
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390 |
28298 | 391 def __eq__(self, other): |
392 """Tests equality on address""" | |
393 if isinstance(other, DNSAddress): | |
394 return self.address == other.address | |
395 return 0 | |
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396 |
28298 | 397 def __repr__(self): |
398 """String representation""" | |
399 try: | |
400 return socket.inet_ntoa(self.address) | |
401 except Exception: | |
402 return self.address | |
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403 |
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404 |
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405 class DNSHinfo(DNSRecord): |
28298 | 406 """A DNS host information record""" |
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407 |
28298 | 408 def __init__(self, name, type, clazz, ttl, cpu, os): |
409 DNSRecord.__init__(self, name, type, clazz, ttl) | |
410 self.cpu = cpu | |
411 self.os = os | |
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412 |
28298 | 413 def write(self, out): |
414 """Used in constructing an outgoing packet""" | |
415 out.writeString(self.cpu, len(self.cpu)) | |
416 out.writeString(self.os, len(self.os)) | |
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417 |
28298 | 418 def __eq__(self, other): |
419 """Tests equality on cpu and os""" | |
420 if isinstance(other, DNSHinfo): | |
421 return self.cpu == other.cpu and self.os == other.os | |
422 return 0 | |
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423 |
28298 | 424 def __repr__(self): |
425 """String representation""" | |
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426 return self.cpu + b" " + self.os |
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427 |
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428 |
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429 class DNSPointer(DNSRecord): |
28298 | 430 """A DNS pointer record""" |
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431 |
28298 | 432 def __init__(self, name, type, clazz, ttl, alias): |
433 DNSRecord.__init__(self, name, type, clazz, ttl) | |
434 self.alias = alias | |
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435 |
28298 | 436 def write(self, out): |
437 """Used in constructing an outgoing packet""" | |
438 out.writeName(self.alias) | |
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439 |
28298 | 440 def __eq__(self, other): |
441 """Tests equality on alias""" | |
442 if isinstance(other, DNSPointer): | |
443 return self.alias == other.alias | |
444 return 0 | |
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445 |
28298 | 446 def __repr__(self): |
447 """String representation""" | |
448 return self.toString(self.alias) | |
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449 |
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450 |
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451 class DNSText(DNSRecord): |
28298 | 452 """A DNS text record""" |
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453 |
28298 | 454 def __init__(self, name, type, clazz, ttl, text): |
455 DNSRecord.__init__(self, name, type, clazz, ttl) | |
456 self.text = text | |
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457 |
28298 | 458 def write(self, out): |
459 """Used in constructing an outgoing packet""" | |
460 out.writeString(self.text, len(self.text)) | |
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461 |
28298 | 462 def __eq__(self, other): |
463 """Tests equality on text""" | |
464 if isinstance(other, DNSText): | |
465 return self.text == other.text | |
466 return 0 | |
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467 |
28298 | 468 def __repr__(self): |
469 """String representation""" | |
470 if len(self.text) > 10: | |
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471 return self.toString(self.text[:7] + b"...") |
28298 | 472 else: |
473 return self.toString(self.text) | |
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474 |
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475 |
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476 class DNSService(DNSRecord): |
28298 | 477 """A DNS service record""" |
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478 |
28298 | 479 def __init__(self, name, type, clazz, ttl, priority, weight, port, server): |
480 DNSRecord.__init__(self, name, type, clazz, ttl) | |
481 self.priority = priority | |
482 self.weight = weight | |
483 self.port = port | |
484 self.server = server | |
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485 |
28298 | 486 def write(self, out): |
487 """Used in constructing an outgoing packet""" | |
488 out.writeShort(self.priority) | |
489 out.writeShort(self.weight) | |
490 out.writeShort(self.port) | |
491 out.writeName(self.server) | |
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492 |
28298 | 493 def __eq__(self, other): |
494 """Tests equality on priority, weight, port and server""" | |
495 if isinstance(other, DNSService): | |
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496 return ( |
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497 self.priority == other.priority |
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498 and self.weight == other.weight |
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499 and self.port == other.port |
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500 and self.server == other.server |
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501 ) |
28298 | 502 return 0 |
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503 |
28298 | 504 def __repr__(self): |
505 """String representation""" | |
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506 return self.toString(b"%s:%s" % (self.server, self.port)) |
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507 |
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508 |
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509 class DNSIncoming(object): |
28298 | 510 """Object representation of an incoming DNS packet""" |
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511 |
28298 | 512 def __init__(self, data): |
513 """Constructor from string holding bytes of packet""" | |
514 self.offset = 0 | |
515 self.data = data | |
516 self.questions = [] | |
517 self.answers = [] | |
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518 self.numquestions = 0 |
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519 self.numanswers = 0 |
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520 self.numauthorities = 0 |
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521 self.numadditionals = 0 |
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522 |
28298 | 523 self.readHeader() |
524 self.readQuestions() | |
525 self.readOthers() | |
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526 |
28298 | 527 def readHeader(self): |
528 """Reads header portion of packet""" | |
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529 format = b'!HHHHHH' |
28298 | 530 length = struct.calcsize(format) |
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531 info = struct.unpack( |
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532 format, self.data[self.offset : self.offset + length] |
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533 ) |
28298 | 534 self.offset += length |
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535 |
28298 | 536 self.id = info[0] |
537 self.flags = info[1] | |
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538 self.numquestions = info[2] |
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539 self.numanswers = info[3] |
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540 self.numauthorities = info[4] |
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541 self.numadditionals = info[5] |
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542 |
28298 | 543 def readQuestions(self): |
544 """Reads questions section of packet""" | |
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545 format = b'!HH' |
28298 | 546 length = struct.calcsize(format) |
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547 for i in range(0, self.numquestions): |
28298 | 548 name = self.readName() |
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549 info = struct.unpack( |
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550 format, self.data[self.offset : self.offset + length] |
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551 ) |
28298 | 552 self.offset += length |
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553 |
28298 | 554 try: |
555 question = DNSQuestion(name, info[0], info[1]) | |
556 self.questions.append(question) | |
557 except NonLocalNameException: | |
558 pass | |
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559 |
28298 | 560 def readInt(self): |
561 """Reads an integer from the packet""" | |
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562 format = b'!I' |
28298 | 563 length = struct.calcsize(format) |
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564 info = struct.unpack( |
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565 format, self.data[self.offset : self.offset + length] |
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566 ) |
28298 | 567 self.offset += length |
568 return info[0] | |
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569 |
28298 | 570 def readCharacterString(self): |
571 """Reads a character string from the packet""" | |
572 length = ord(self.data[self.offset]) | |
573 self.offset += 1 | |
574 return self.readString(length) | |
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575 |
28298 | 576 def readString(self, len): |
577 """Reads a string of a given length from the packet""" | |
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578 format = b'!%ds' % len |
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580 info = struct.unpack( |
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581 format, self.data[self.offset : self.offset + length] |
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582 ) |
28298 | 583 self.offset += length |
584 return info[0] | |
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585 |
28298 | 586 def readUnsignedShort(self): |
587 """Reads an unsigned short from the packet""" | |
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588 format = b'!H' |
28298 | 589 length = struct.calcsize(format) |
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590 info = struct.unpack( |
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591 format, self.data[self.offset : self.offset + length] |
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592 ) |
28298 | 593 self.offset += length |
594 return info[0] | |
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595 |
28298 | 596 def readOthers(self): |
28299 | 597 """Reads answers, authorities and additionals section of the packet""" |
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598 format = b'!HHiH' |
28298 | 599 length = struct.calcsize(format) |
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600 n = self.numanswers + self.numauthorities + self.numadditionals |
28298 | 601 for i in range(0, n): |
602 domain = self.readName() | |
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603 info = struct.unpack( |
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604 format, self.data[self.offset : self.offset + length] |
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605 ) |
28298 | 606 self.offset += length |
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607 |
28298 | 608 rec = None |
609 if info[0] == _TYPE_A: | |
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610 rec = DNSAddress( |
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611 domain, info[0], info[1], info[2], self.readString(4) |
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612 ) |
28298 | 613 elif info[0] == _TYPE_CNAME or info[0] == _TYPE_PTR: |
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614 rec = DNSPointer( |
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615 domain, info[0], info[1], info[2], self.readName() |
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616 ) |
28298 | 617 elif info[0] == _TYPE_TXT: |
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618 rec = DNSText( |
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619 domain, info[0], info[1], info[2], self.readString(info[3]) |
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620 ) |
28298 | 621 elif info[0] == _TYPE_SRV: |
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622 rec = DNSService( |
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623 domain, |
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624 info[0], |
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625 info[1], |
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626 info[2], |
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627 self.readUnsignedShort(), |
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628 self.readUnsignedShort(), |
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629 self.readUnsignedShort(), |
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630 self.readName(), |
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631 ) |
28298 | 632 elif info[0] == _TYPE_HINFO: |
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633 rec = DNSHinfo( |
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634 domain, |
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635 info[0], |
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636 info[1], |
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637 info[2], |
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638 self.readCharacterString(), |
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639 self.readCharacterString(), |
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640 ) |
28298 | 641 elif info[0] == _TYPE_AAAA: |
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642 rec = DNSAddress( |
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643 domain, info[0], info[1], info[2], self.readString(16) |
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644 ) |
28298 | 645 else: |
646 # Try to ignore types we don't know about | |
647 # this may mean the rest of the name is | |
648 # unable to be parsed, and may show errors | |
649 # so this is left for debugging. New types | |
650 # encountered need to be parsed properly. | |
651 # | |
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652 # print "UNKNOWN TYPE = " + str(info[0]) |
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653 # raise BadTypeInNameException |
28298 | 654 self.offset += info[3] |
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655 |
28298 | 656 if rec is not None: |
657 self.answers.append(rec) | |
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658 |
28298 | 659 def isQuery(self): |
660 """Returns true if this is a query""" | |
661 return (self.flags & _FLAGS_QR_MASK) == _FLAGS_QR_QUERY | |
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662 |
28298 | 663 def isResponse(self): |
664 """Returns true if this is a response""" | |
665 return (self.flags & _FLAGS_QR_MASK) == _FLAGS_QR_RESPONSE | |
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666 |
28298 | 667 def readUTF(self, offset, len): |
668 """Reads a UTF-8 string of a given length from the packet""" | |
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669 return self.data[offset : offset + len].decode('utf-8') |
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670 |
28298 | 671 def readName(self): |
672 """Reads a domain name from the packet""" | |
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673 result = r'' |
28298 | 674 off = self.offset |
675 next = -1 | |
676 first = off | |
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677 |
28298 | 678 while True: |
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679 len = ord(self.data[off : off + 1]) |
28298 | 680 off += 1 |
681 if len == 0: | |
682 break | |
683 t = len & 0xC0 | |
684 if t == 0x00: | |
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685 result = ''.join((result, self.readUTF(off, len) + '.')) |
28298 | 686 off += len |
687 elif t == 0xC0: | |
688 if next < 0: | |
689 next = off + 1 | |
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690 off = ((len & 0x3F) << 8) | ord(self.data[off : off + 1]) |
28298 | 691 if off >= first: |
692 raise BadDomainNameCircular(off) | |
693 first = off | |
694 else: | |
695 raise BadDomainName(off) | |
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696 |
28298 | 697 if next >= 0: |
698 self.offset = next | |
699 else: | |
700 self.offset = off | |
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701 |
28298 | 702 return result |
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703 |
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704 |
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705 class DNSOutgoing(object): |
28298 | 706 """Object representation of an outgoing packet""" |
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707 |
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708 def __init__(self, flags, multicast=1): |
28298 | 709 self.finished = 0 |
710 self.id = 0 | |
711 self.multicast = multicast | |
712 self.flags = flags | |
713 self.names = {} | |
714 self.data = [] | |
715 self.size = 12 | |
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716 |
28298 | 717 self.questions = [] |
718 self.answers = [] | |
719 self.authorities = [] | |
720 self.additionals = [] | |
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721 |
28298 | 722 def addQuestion(self, record): |
723 """Adds a question""" | |
724 self.questions.append(record) | |
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725 |
28298 | 726 def addAnswer(self, inp, record): |
727 """Adds an answer""" | |
728 if not record.suppressedBy(inp): | |
729 self.addAnswerAtTime(record, 0) | |
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730 |
28298 | 731 def addAnswerAtTime(self, record, now): |
732 """Adds an answer if if does not expire by a certain time""" | |
733 if record is not None: | |
734 if now == 0 or not record.isExpired(now): | |
735 self.answers.append((record, now)) | |
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736 |
28298 | 737 def addAuthoritativeAnswer(self, record): |
738 """Adds an authoritative answer""" | |
739 self.authorities.append(record) | |
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740 |
28298 | 741 def addAdditionalAnswer(self, record): |
742 """Adds an additional answer""" | |
743 self.additionals.append(record) | |
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744 |
28298 | 745 def writeByte(self, value): |
746 """Writes a single byte to the packet""" | |
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747 format = b'!c' |
28298 | 748 self.data.append(struct.pack(format, chr(value))) |
749 self.size += 1 | |
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750 |
28298 | 751 def insertShort(self, index, value): |
752 """Inserts an unsigned short in a certain position in the packet""" | |
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753 format = b'!H' |
28298 | 754 self.data.insert(index, struct.pack(format, value)) |
755 self.size += 2 | |
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756 |
28298 | 757 def writeShort(self, value): |
758 """Writes an unsigned short to the packet""" | |
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759 format = b'!H' |
28298 | 760 self.data.append(struct.pack(format, value)) |
761 self.size += 2 | |
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762 |
28298 | 763 def writeInt(self, value): |
764 """Writes an unsigned integer to the packet""" | |
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765 format = b'!I' |
28298 | 766 self.data.append(struct.pack(format, int(value))) |
767 self.size += 4 | |
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768 |
28298 | 769 def writeString(self, value, length): |
770 """Writes a string to the packet""" | |
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771 format = '!' + str(length) + 's' |
28298 | 772 self.data.append(struct.pack(format, value)) |
773 self.size += length | |
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774 |
28298 | 775 def writeUTF(self, s): |
776 """Writes a UTF-8 string of a given length to the packet""" | |
777 utfstr = s.encode('utf-8') | |
778 length = len(utfstr) | |
779 if length > 64: | |
780 raise NamePartTooLongException | |
781 self.writeByte(length) | |
782 self.writeString(utfstr, length) | |
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783 |
28298 | 784 def writeName(self, name): |
785 """Writes a domain name to the packet""" | |
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786 |
28298 | 787 try: |
788 # Find existing instance of this name in packet | |
789 # | |
790 index = self.names[name] | |
791 except KeyError: | |
792 # No record of this name already, so write it | |
793 # out as normal, recording the location of the name | |
794 # for future pointers to it. | |
795 # | |
796 self.names[name] = self.size | |
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797 parts = name.split(b'.') |
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798 if parts[-1] == b'': |
28298 | 799 parts = parts[:-1] |
800 for part in parts: | |
801 self.writeUTF(part) | |
802 self.writeByte(0) | |
803 return | |
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804 |
28298 | 805 # An index was found, so write a pointer to it |
806 # | |
807 self.writeByte((index >> 8) | 0xC0) | |
808 self.writeByte(index) | |
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809 |
28298 | 810 def writeQuestion(self, question): |
811 """Writes a question to the packet""" | |
812 self.writeName(question.name) | |
813 self.writeShort(question.type) | |
814 self.writeShort(question.clazz) | |
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815 |
28298 | 816 def writeRecord(self, record, now): |
817 """Writes a record (answer, authoritative answer, additional) to | |
818 the packet""" | |
819 self.writeName(record.name) | |
820 self.writeShort(record.type) | |
821 if record.unique and self.multicast: | |
822 self.writeShort(record.clazz | _CLASS_UNIQUE) | |
823 else: | |
824 self.writeShort(record.clazz) | |
825 if now == 0: | |
826 self.writeInt(record.ttl) | |
827 else: | |
828 self.writeInt(record.getRemainingTTL(now)) | |
829 index = len(self.data) | |
830 # Adjust size for the short we will write before this record | |
831 # | |
832 self.size += 2 | |
833 record.write(self) | |
834 self.size -= 2 | |
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835 |
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836 length = len(b''.join(self.data[index:])) |
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837 self.insertShort(index, length) # Here is the short we adjusted for |
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838 |
28298 | 839 def packet(self): |
840 """Returns a string containing the packet's bytes | |
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841 |
28298 | 842 No further parts should be added to the packet once this |
843 is done.""" | |
844 if not self.finished: | |
845 self.finished = 1 | |
846 for question in self.questions: | |
847 self.writeQuestion(question) | |
848 for answer, time_ in self.answers: | |
849 self.writeRecord(answer, time_) | |
850 for authority in self.authorities: | |
851 self.writeRecord(authority, 0) | |
852 for additional in self.additionals: | |
853 self.writeRecord(additional, 0) | |
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854 |
28298 | 855 self.insertShort(0, len(self.additionals)) |
856 self.insertShort(0, len(self.authorities)) | |
857 self.insertShort(0, len(self.answers)) | |
858 self.insertShort(0, len(self.questions)) | |
859 self.insertShort(0, self.flags) | |
860 if self.multicast: | |
861 self.insertShort(0, 0) | |
862 else: | |
863 self.insertShort(0, self.id) | |
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864 return b''.join(self.data) |
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|
865 |
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|
866 |
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diff
changeset
|
867 class DNSCache(object): |
28298 | 868 """A cache of DNS entries""" |
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869 |
28298 | 870 def __init__(self): |
871 self.cache = {} | |
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|
872 |
28298 | 873 def add(self, entry): |
874 """Adds an entry""" | |
875 try: | |
876 list = self.cache[entry.key] | |
877 except KeyError: | |
878 list = self.cache[entry.key] = [] | |
879 list.append(entry) | |
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|
880 |
28298 | 881 def remove(self, entry): |
882 """Removes an entry""" | |
883 try: | |
884 list = self.cache[entry.key] | |
885 list.remove(entry) | |
886 except KeyError: | |
887 pass | |
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|
888 |
28298 | 889 def get(self, entry): |
890 """Gets an entry by key. Will return None if there is no | |
891 matching entry.""" | |
892 try: | |
893 list = self.cache[entry.key] | |
894 return list[list.index(entry)] | |
895 except (KeyError, ValueError): | |
896 return None | |
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|
897 |
28298 | 898 def getByDetails(self, name, type, clazz): |
899 """Gets an entry by details. Will return None if there is | |
900 no matching entry.""" | |
901 entry = DNSEntry(name, type, clazz) | |
902 return self.get(entry) | |
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|
903 |
28298 | 904 def entriesWithName(self, name): |
905 """Returns a list of entries whose key matches the name.""" | |
906 try: | |
907 return self.cache[name] | |
908 except KeyError: | |
909 return [] | |
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|
910 |
28298 | 911 def entries(self): |
912 """Returns a list of all entries""" | |
913 try: | |
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28421
diff
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|
914 return list(itertools.chain.from_iterable(self.cache.values())) |
28298 | 915 except Exception: |
916 return [] | |
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|
917 |
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|
918 |
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|
919 class Engine(threading.Thread): |
28298 | 920 """An engine wraps read access to sockets, allowing objects that |
921 need to receive data from sockets to be called back when the | |
922 sockets are ready. | |
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|
923 |
28298 | 924 A reader needs a handle_read() method, which is called when the socket |
925 it is interested in is ready for reading. | |
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|
926 |
28298 | 927 Writers are not implemented here, because we only send short |
928 packets. | |
929 """ | |
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|
930 |
28298 | 931 def __init__(self, zeroconf): |
932 threading.Thread.__init__(self) | |
933 self.zeroconf = zeroconf | |
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934 self.readers = {} # maps socket to reader |
28298 | 935 self.timeout = 5 |
936 self.condition = threading.Condition() | |
937 self.start() | |
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|
938 |
28298 | 939 def run(self): |
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940 while not globals()[b'_GLOBAL_DONE']: |
28298 | 941 rs = self.getReaders() |
942 if len(rs) == 0: | |
943 # No sockets to manage, but we wait for the timeout | |
944 # or addition of a socket | |
945 # | |
946 self.condition.acquire() | |
947 self.condition.wait(self.timeout) | |
948 self.condition.release() | |
949 else: | |
950 try: | |
951 rr, wr, er = select.select(rs, [], [], self.timeout) | |
952 for sock in rr: | |
953 try: | |
954 self.readers[sock].handle_read() | |
955 except Exception: | |
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956 if not globals()[b'_GLOBAL_DONE']: |
28298 | 957 traceback.print_exc() |
958 except Exception: | |
959 pass | |
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|
960 |
28298 | 961 def getReaders(self): |
962 self.condition.acquire() | |
963 result = self.readers.keys() | |
964 self.condition.release() | |
965 return result | |
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|
966 |
28298 | 967 def addReader(self, reader, socket): |
968 self.condition.acquire() | |
969 self.readers[socket] = reader | |
970 self.condition.notify() | |
971 self.condition.release() | |
7071
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|
972 |
28298 | 973 def delReader(self, socket): |
974 self.condition.acquire() | |
28301
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diff
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|
975 del self.readers[socket] |
28298 | 976 self.condition.notify() |
977 self.condition.release() | |
7071
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Matt Mackall <mpm@selenic.com>
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|
978 |
28298 | 979 def notify(self): |
980 self.condition.acquire() | |
981 self.condition.notify() | |
982 self.condition.release() | |
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|
983 |
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|
984 |
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diff
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|
985 class Listener(object): |
28298 | 986 """A Listener is used by this module to listen on the multicast |
987 group to which DNS messages are sent, allowing the implementation | |
988 to cache information as it arrives. | |
7071
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|
989 |
28298 | 990 It requires registration with an Engine object in order to have |
991 the read() method called when a socket is available for reading.""" | |
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|
992 |
28298 | 993 def __init__(self, zeroconf): |
994 self.zeroconf = zeroconf | |
995 self.zeroconf.engine.addReader(self, self.zeroconf.socket) | |
7071
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diff
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|
996 |
28298 | 997 def handle_read(self): |
34447
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Jun Wu <quark@fb.com>
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|
998 sock = self.zeroconf.socket |
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zeroconf: do not crash if socket being read is closed by another thread
Jun Wu <quark@fb.com>
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diff
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|
999 try: |
5385b76fd1fd
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Jun Wu <quark@fb.com>
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diff
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|
1000 data, (addr, port) = sock.recvfrom(_MAX_MSG_ABSOLUTE) |
5385b76fd1fd
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Jun Wu <quark@fb.com>
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|
1001 except socket.error as e: |
5385b76fd1fd
zeroconf: do not crash if socket being read is closed by another thread
Jun Wu <quark@fb.com>
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diff
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|
1002 if e.errno == errno.EBADF: |
5385b76fd1fd
zeroconf: do not crash if socket being read is closed by another thread
Jun Wu <quark@fb.com>
parents:
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diff
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|
1003 # some other thread may close the socket |
5385b76fd1fd
zeroconf: do not crash if socket being read is closed by another thread
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28504
diff
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|
1004 return |
5385b76fd1fd
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Jun Wu <quark@fb.com>
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diff
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|
1005 else: |
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Jun Wu <quark@fb.com>
parents:
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diff
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|
1006 raise |
28298 | 1007 self.data = data |
1008 msg = DNSIncoming(data) | |
1009 if msg.isQuery(): | |
1010 # Always multicast responses | |
1011 # | |
1012 if port == _MDNS_PORT: | |
1013 self.zeroconf.handleQuery(msg, _MDNS_ADDR, _MDNS_PORT) | |
1014 # If it's not a multicast query, reply via unicast | |
1015 # and multicast | |
1016 # | |
1017 elif port == _DNS_PORT: | |
1018 self.zeroconf.handleQuery(msg, addr, port) | |
1019 self.zeroconf.handleQuery(msg, _MDNS_ADDR, _MDNS_PORT) | |
1020 else: | |
1021 self.zeroconf.handleResponse(msg) | |
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643c751e60b2
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|
1022 |
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|
1023 |
643c751e60b2
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|
1024 class Reaper(threading.Thread): |
28298 | 1025 """A Reaper is used by this module to remove cache entries that |
1026 have expired.""" | |
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diff
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|
1027 |
28298 | 1028 def __init__(self, zeroconf): |
1029 threading.Thread.__init__(self) | |
1030 self.zeroconf = zeroconf | |
1031 self.start() | |
7071
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parents:
diff
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|
1032 |
28298 | 1033 def run(self): |
1034 while True: | |
1035 self.zeroconf.wait(10 * 1000) | |
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|
1036 if globals()[b'_GLOBAL_DONE']: |
28298 | 1037 return |
1038 now = currentTimeMillis() | |
1039 for record in self.zeroconf.cache.entries(): | |
1040 if record.isExpired(now): | |
1041 self.zeroconf.updateRecord(now, record) | |
1042 self.zeroconf.cache.remove(record) | |
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|
1043 |
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|
1044 |
643c751e60b2
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Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1045 class ServiceBrowser(threading.Thread): |
28298 | 1046 """Used to browse for a service of a specific type. |
7071
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diff
changeset
|
1047 |
28298 | 1048 The listener object will have its addService() and |
1049 removeService() methods called when this browser | |
1050 discovers changes in the services availability.""" | |
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|
1051 |
28298 | 1052 def __init__(self, zeroconf, type, listener): |
1053 """Creates a browser for a specific type""" | |
1054 threading.Thread.__init__(self) | |
1055 self.zeroconf = zeroconf | |
1056 self.type = type | |
1057 self.listener = listener | |
1058 self.services = {} | |
28419
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parents:
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diff
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|
1059 self.nexttime = currentTimeMillis() |
28298 | 1060 self.delay = _BROWSER_TIME |
1061 self.list = [] | |
7877
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|
1062 |
28298 | 1063 self.done = 0 |
7071
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|
1064 |
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|
1065 self.zeroconf.addListener( |
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changeset
|
1066 self, DNSQuestion(self.type, _TYPE_PTR, _CLASS_IN) |
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|
1067 ) |
28298 | 1068 self.start() |
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|
1069 |
28298 | 1070 def updateRecord(self, zeroconf, now, record): |
1071 """Callback invoked by Zeroconf when new information arrives. | |
7071
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|
1072 |
28298 | 1073 Updates information required by browser in the Zeroconf cache.""" |
1074 if record.type == _TYPE_PTR and record.name == self.type: | |
1075 expired = record.isExpired(now) | |
1076 try: | |
1077 oldrecord = self.services[record.alias.lower()] | |
1078 if not expired: | |
1079 oldrecord.resetTTL(record) | |
1080 else: | |
28301
fd8a4d2d6541
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parents:
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diff
changeset
|
1081 del self.services[record.alias.lower()] |
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1082 callback = lambda x: self.listener.removeService( |
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|
1083 x, self.type, record.alias |
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|
1084 ) |
28298 | 1085 self.list.append(callback) |
1086 return | |
1087 except Exception: | |
1088 if not expired: | |
1089 self.services[record.alias.lower()] = record | |
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1090 callback = lambda x: self.listener.addService( |
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|
1091 x, self.type, record.alias |
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|
1092 ) |
28298 | 1093 self.list.append(callback) |
7071
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|
1094 |
28298 | 1095 expires = record.getExpirationTime(75) |
28419
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|
1096 if expires < self.nexttime: |
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changeset
|
1097 self.nexttime = expires |
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|
1098 |
28298 | 1099 def cancel(self): |
1100 self.done = 1 | |
1101 self.zeroconf.notifyAll() | |
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|
1102 |
28298 | 1103 def run(self): |
1104 while True: | |
1105 event = None | |
1106 now = currentTimeMillis() | |
28419
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|
1107 if len(self.list) == 0 and self.nexttime > now: |
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|
1108 self.zeroconf.wait(self.nexttime - now) |
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|
1109 if globals()[b'_GLOBAL_DONE'] or self.done: |
28298 | 1110 return |
1111 now = currentTimeMillis() | |
7071
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|
1112 |
28419
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|
1113 if self.nexttime <= now: |
28298 | 1114 out = DNSOutgoing(_FLAGS_QR_QUERY) |
1115 out.addQuestion(DNSQuestion(self.type, _TYPE_PTR, _CLASS_IN)) | |
1116 for record in self.services.values(): | |
1117 if not record.isExpired(now): | |
1118 out.addAnswerAtTime(record, now) | |
1119 self.zeroconf.send(out) | |
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|
1120 self.nexttime = now + self.delay |
28298 | 1121 self.delay = min(20 * 1000, self.delay * 2) |
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|
1122 |
28298 | 1123 if len(self.list) > 0: |
1124 event = self.list.pop(0) | |
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|
1125 |
28298 | 1126 if event is not None: |
1127 event(self.zeroconf) | |
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|
1128 |
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|
1129 |
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changeset
|
1130 class ServiceInfo(object): |
28298 | 1131 """Service information""" |
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|
1132 |
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|
1133 def __init__( |
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|
1134 self, |
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|
1135 type, |
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|
1136 name, |
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1137 address=None, |
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1138 port=None, |
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1139 weight=0, |
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1140 priority=0, |
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1141 properties=None, |
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1142 server=None, |
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1143 ): |
28298 | 1144 """Create a service description. |
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1145 |
28298 | 1146 type: fully qualified service type name |
1147 name: fully qualified service name | |
1148 address: IP address as unsigned short, network byte order | |
1149 port: port that the service runs on | |
1150 weight: weight of the service | |
1151 priority: priority of the service | |
28299 | 1152 properties: dictionary of properties (or a string holding the bytes for |
1153 the text field) | |
28298 | 1154 server: fully qualified name for service host (defaults to name)""" |
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1155 |
28298 | 1156 if not name.endswith(type): |
1157 raise BadTypeInNameException | |
1158 self.type = type | |
1159 self.name = name | |
1160 self.address = address | |
1161 self.port = port | |
1162 self.weight = weight | |
1163 self.priority = priority | |
1164 if server: | |
1165 self.server = server | |
1166 else: | |
1167 self.server = name | |
1168 self.setProperties(properties) | |
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1169 |
28298 | 1170 def setProperties(self, properties): |
1171 """Sets properties and text of this info from a dictionary""" | |
1172 if isinstance(properties, dict): | |
1173 self.properties = properties | |
1174 list = [] | |
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1175 result = b'' |
28298 | 1176 for key in properties: |
1177 value = properties[key] | |
1178 if value is None: | |
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1179 suffix = b'' |
28298 | 1180 elif isinstance(value, str): |
1181 suffix = value | |
1182 elif isinstance(value, int): | |
1183 if value: | |
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1184 suffix = b'true' |
28298 | 1185 else: |
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1186 suffix = b'false' |
28298 | 1187 else: |
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1188 suffix = b'' |
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1189 list.append(b'='.join((key, suffix))) |
28298 | 1190 for item in list: |
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1191 result = b''.join( |
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1192 ( |
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1193 result, |
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1194 struct.pack(b'!c', pycompat.bytechr(len(item))), |
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1195 item, |
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1196 ) |
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1197 ) |
28298 | 1198 self.text = result |
1199 else: | |
1200 self.text = properties | |
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1201 |
28298 | 1202 def setText(self, text): |
1203 """Sets properties and text given a text field""" | |
1204 self.text = text | |
1205 try: | |
1206 result = {} | |
1207 end = len(text) | |
1208 index = 0 | |
1209 strs = [] | |
1210 while index < end: | |
1211 length = ord(text[index]) | |
1212 index += 1 | |
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1213 strs.append(text[index : index + length]) |
28298 | 1214 index += length |
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1215 |
28298 | 1216 for s in strs: |
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1217 eindex = s.find(b'=') |
28298 | 1218 if eindex == -1: |
1219 # No equals sign at all | |
1220 key = s | |
1221 value = 0 | |
1222 else: | |
1223 key = s[:eindex] | |
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1224 value = s[eindex + 1 :] |
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1225 if value == b'true': |
28298 | 1226 value = 1 |
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1227 elif value == b'false' or not value: |
28298 | 1228 value = 0 |
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1229 |
28298 | 1230 # Only update non-existent properties |
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1231 if key and result.get(key) is None: |
28298 | 1232 result[key] = value |
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1233 |
28298 | 1234 self.properties = result |
1235 except Exception: | |
1236 traceback.print_exc() | |
1237 self.properties = None | |
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1238 |
28298 | 1239 def getType(self): |
1240 """Type accessor""" | |
1241 return self.type | |
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1242 |
28298 | 1243 def getName(self): |
1244 """Name accessor""" | |
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1245 if self.type is not None and self.name.endswith(b"." + self.type): |
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1246 return self.name[: len(self.name) - len(self.type) - 1] |
28298 | 1247 return self.name |
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1248 |
28298 | 1249 def getAddress(self): |
1250 """Address accessor""" | |
1251 return self.address | |
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1252 |
28298 | 1253 def getPort(self): |
1254 """Port accessor""" | |
1255 return self.port | |
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1256 |
28298 | 1257 def getPriority(self): |
1258 """Priority accessor""" | |
1259 return self.priority | |
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1260 |
28298 | 1261 def getWeight(self): |
1262 """Weight accessor""" | |
1263 return self.weight | |
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1264 |
28298 | 1265 def getProperties(self): |
1266 """Properties accessor""" | |
1267 return self.properties | |
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1268 |
28298 | 1269 def getText(self): |
1270 """Text accessor""" | |
1271 return self.text | |
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1272 |
28298 | 1273 def getServer(self): |
1274 """Server accessor""" | |
1275 return self.server | |
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1276 |
28298 | 1277 def updateRecord(self, zeroconf, now, record): |
1278 """Updates service information from a DNS record""" | |
1279 if record is not None and not record.isExpired(now): | |
1280 if record.type == _TYPE_A: | |
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1281 # if record.name == self.name: |
28298 | 1282 if record.name == self.server: |
1283 self.address = record.address | |
1284 elif record.type == _TYPE_SRV: | |
1285 if record.name == self.name: | |
1286 self.server = record.server | |
1287 self.port = record.port | |
1288 self.weight = record.weight | |
1289 self.priority = record.priority | |
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1290 # self.address = None |
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1291 self.updateRecord( |
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1292 zeroconf, |
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1293 now, |
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1294 zeroconf.cache.getByDetails( |
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1295 self.server, _TYPE_A, _CLASS_IN |
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1296 ), |
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1297 ) |
28298 | 1298 elif record.type == _TYPE_TXT: |
1299 if record.name == self.name: | |
1300 self.setText(record.text) | |
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1301 |
28298 | 1302 def request(self, zeroconf, timeout): |
1303 """Returns true if the service could be discovered on the | |
1304 network, and updates this object with details discovered. | |
1305 """ | |
1306 now = currentTimeMillis() | |
1307 delay = _LISTENER_TIME | |
1308 next = now + delay | |
1309 last = now + timeout | |
1310 try: | |
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1311 zeroconf.addListener( |
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1312 self, DNSQuestion(self.name, _TYPE_ANY, _CLASS_IN) |
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1313 ) |
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1314 while ( |
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1315 self.server is None or self.address is None or self.text is None |
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1316 ): |
28298 | 1317 if last <= now: |
1318 return 0 | |
1319 if next <= now: | |
1320 out = DNSOutgoing(_FLAGS_QR_QUERY) | |
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1321 out.addQuestion( |
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1322 DNSQuestion(self.name, _TYPE_SRV, _CLASS_IN) |
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1323 ) |
28299 | 1324 out.addAnswerAtTime( |
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1325 zeroconf.cache.getByDetails( |
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1326 self.name, _TYPE_SRV, _CLASS_IN |
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1327 ), |
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1328 now, |
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1329 ) |
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1330 out.addQuestion( |
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1331 DNSQuestion(self.name, _TYPE_TXT, _CLASS_IN) |
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1332 ) |
28299 | 1333 out.addAnswerAtTime( |
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1334 zeroconf.cache.getByDetails( |
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1335 self.name, _TYPE_TXT, _CLASS_IN |
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1336 ), |
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1337 now, |
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1338 ) |
28298 | 1339 if self.server is not None: |
28299 | 1340 out.addQuestion( |
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1341 DNSQuestion(self.server, _TYPE_A, _CLASS_IN) |
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1342 ) |
28299 | 1343 out.addAnswerAtTime( |
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1344 zeroconf.cache.getByDetails( |
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1345 self.server, _TYPE_A, _CLASS_IN |
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1346 ), |
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1347 now, |
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1348 ) |
28298 | 1349 zeroconf.send(out) |
1350 next = now + delay | |
1351 delay = delay * 2 | |
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1352 |
28298 | 1353 zeroconf.wait(min(next, last) - now) |
1354 now = currentTimeMillis() | |
1355 result = 1 | |
1356 finally: | |
1357 zeroconf.removeListener(self) | |
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1358 |
28298 | 1359 return result |
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1360 |
28298 | 1361 def __eq__(self, other): |
1362 """Tests equality of service name""" | |
1363 if isinstance(other, ServiceInfo): | |
1364 return other.name == self.name | |
1365 return 0 | |
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1366 |
28298 | 1367 def __ne__(self, other): |
1368 """Non-equality test""" | |
1369 return not self.__eq__(other) | |
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1370 |
28298 | 1371 def __repr__(self): |
1372 """String representation""" | |
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1373 result = b"service[%s,%s:%s," % ( |
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1374 self.name, |
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1375 socket.inet_ntoa(self.getAddress()), |
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1376 self.port, |
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1377 ) |
28298 | 1378 if self.text is None: |
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1379 result += b"None" |
28298 | 1380 else: |
1381 if len(self.text) < 20: | |
1382 result += self.text | |
1383 else: | |
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1384 result += self.text[:17] + b"..." |
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1385 result += b"]" |
28298 | 1386 return result |
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|
1387 |
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changeset
|
1388 |
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diff
changeset
|
1389 class Zeroconf(object): |
28298 | 1390 """Implementation of Zeroconf Multicast DNS Service Discovery |
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|
1391 |
28298 | 1392 Supports registration, unregistration, queries and browsing. |
1393 """ | |
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1394 |
28298 | 1395 def __init__(self, bindaddress=None): |
1396 """Creates an instance of the Zeroconf class, establishing | |
1397 multicast communications, listening and reaping threads.""" | |
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1398 globals()[b'_GLOBAL_DONE'] = 0 |
28298 | 1399 if bindaddress is None: |
1400 self.intf = socket.gethostbyname(socket.gethostname()) | |
1401 else: | |
1402 self.intf = bindaddress | |
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1403 self.group = (b'', _MDNS_PORT) |
28298 | 1404 self.socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) |
1405 try: | |
1406 self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) | |
1407 self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1) | |
1408 except Exception: | |
1409 # SO_REUSEADDR should be equivalent to SO_REUSEPORT for | |
1410 # multicast UDP sockets (p 731, "TCP/IP Illustrated, | |
1411 # Volume 2"), but some BSD-derived systems require | |
1412 # SO_REUSEPORT to be specified explicitly. Also, not all | |
1413 # versions of Python have SO_REUSEPORT available. So | |
1414 # if you're on a BSD-based system, and haven't upgraded | |
1415 # to Python 2.3 yet, you may find this library doesn't | |
1416 # work as expected. | |
1417 # | |
1418 pass | |
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1419 self.socket.setsockopt(socket.SOL_IP, socket.IP_MULTICAST_TTL, b"\xff") |
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|
1420 self.socket.setsockopt(socket.SOL_IP, socket.IP_MULTICAST_LOOP, b"\x01") |
28298 | 1421 try: |
1422 self.socket.bind(self.group) | |
1423 except Exception: | |
1424 # Some versions of linux raise an exception even though | |
1425 # SO_REUSEADDR and SO_REUSEPORT have been set, so ignore it | |
1426 pass | |
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|
1427 self.socket.setsockopt( |
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|
1428 socket.SOL_IP, |
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|
1429 socket.IP_ADD_MEMBERSHIP, |
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|
1430 socket.inet_aton(_MDNS_ADDR) + socket.inet_aton('0.0.0.0'), |
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|
1431 ) |
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|
1432 |
28298 | 1433 self.listeners = [] |
1434 self.browsers = [] | |
1435 self.services = {} | |
1436 self.servicetypes = {} | |
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parents:
diff
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|
1437 |
28298 | 1438 self.cache = DNSCache() |
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parents:
diff
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|
1439 |
28298 | 1440 self.condition = threading.Condition() |
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diff
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|
1441 |
28298 | 1442 self.engine = Engine(self) |
1443 self.listener = Listener(self) | |
1444 self.reaper = Reaper(self) | |
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|
1445 |
28298 | 1446 def isLoopback(self): |
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|
1447 return self.intf.startswith(b"127.0.0.1") |
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parents:
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|
1448 |
28298 | 1449 def isLinklocal(self): |
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|
1450 return self.intf.startswith(b"169.254.") |
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Matt Mackall <mpm@selenic.com>
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diff
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|
1451 |
28298 | 1452 def wait(self, timeout): |
1453 """Calling thread waits for a given number of milliseconds or | |
1454 until notified.""" | |
1455 self.condition.acquire() | |
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|
1456 self.condition.wait(timeout / 1000) |
28298 | 1457 self.condition.release() |
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Matt Mackall <mpm@selenic.com>
parents:
diff
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|
1458 |
28298 | 1459 def notifyAll(self): |
1460 """Notifies all waiting threads""" | |
1461 self.condition.acquire() | |
1462 self.condition.notifyAll() | |
1463 self.condition.release() | |
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Matt Mackall <mpm@selenic.com>
parents:
diff
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|
1464 |
28298 | 1465 def getServiceInfo(self, type, name, timeout=3000): |
1466 """Returns network's service information for a particular | |
1467 name and type, or None if no service matches by the timeout, | |
1468 which defaults to 3 seconds.""" | |
1469 info = ServiceInfo(type, name) | |
1470 if info.request(self, timeout): | |
1471 return info | |
1472 return None | |
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parents:
diff
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|
1473 |
28298 | 1474 def addServiceListener(self, type, listener): |
1475 """Adds a listener for a particular service type. This object | |
1476 will then have its updateRecord method called when information | |
1477 arrives for that type.""" | |
1478 self.removeServiceListener(listener) | |
1479 self.browsers.append(ServiceBrowser(self, type, listener)) | |
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Matt Mackall <mpm@selenic.com>
parents:
diff
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|
1480 |
28298 | 1481 def removeServiceListener(self, listener): |
1482 """Removes a listener from the set that is currently listening.""" | |
1483 for browser in self.browsers: | |
1484 if browser.listener == listener: | |
1485 browser.cancel() | |
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|
1486 del browser |
7071
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Matt Mackall <mpm@selenic.com>
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diff
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|
1487 |
28298 | 1488 def registerService(self, info, ttl=_DNS_TTL): |
1489 """Registers service information to the network with a default TTL | |
1490 of 60 seconds. Zeroconf will then respond to requests for | |
1491 information for that service. The name of the service may be | |
1492 changed if needed to make it unique on the network.""" | |
1493 self.checkService(info) | |
1494 self.services[info.name.lower()] = info | |
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timeless <timeless@mozdev.org>
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1495 if info.type in self.servicetypes: |
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|
1496 self.servicetypes[info.type] += 1 |
28298 | 1497 else: |
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diff
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|
1498 self.servicetypes[info.type] = 1 |
28298 | 1499 now = currentTimeMillis() |
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|
1500 nexttime = now |
28298 | 1501 i = 0 |
1502 while i < 3: | |
28419
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|
1503 if now < nexttime: |
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|
1504 self.wait(nexttime - now) |
28298 | 1505 now = currentTimeMillis() |
1506 continue | |
1507 out = DNSOutgoing(_FLAGS_QR_RESPONSE | _FLAGS_AA) | |
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|
1508 out.addAnswerAtTime( |
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1509 DNSPointer(info.type, _TYPE_PTR, _CLASS_IN, ttl, info.name), 0 |
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|
1510 ) |
28299 | 1511 out.addAnswerAtTime( |
1512 DNSService( | |
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|
1513 info.name, |
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1514 _TYPE_SRV, |
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1515 _CLASS_IN, |
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|
1516 ttl, |
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|
1517 info.priority, |
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|
1518 info.weight, |
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|
1519 info.port, |
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|
1520 info.server, |
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|
1521 ), |
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|
1522 0, |
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|
1523 ) |
28299 | 1524 out.addAnswerAtTime( |
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|
1525 DNSText(info.name, _TYPE_TXT, _CLASS_IN, ttl, info.text), 0 |
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|
1526 ) |
28298 | 1527 if info.address: |
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|
1528 out.addAnswerAtTime( |
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|
1529 DNSAddress( |
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|
1530 info.server, _TYPE_A, _CLASS_IN, ttl, info.address |
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|
1531 ), |
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|
1532 0, |
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|
1533 ) |
28298 | 1534 self.send(out) |
1535 i += 1 | |
28419
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|
1536 nexttime += _REGISTER_TIME |
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Matt Mackall <mpm@selenic.com>
parents:
diff
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|
1537 |
28298 | 1538 def unregisterService(self, info): |
1539 """Unregister a service.""" | |
1540 try: | |
28301
fd8a4d2d6541
zeroconf: del is not a function
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28300
diff
changeset
|
1541 del self.services[info.name.lower()] |
28300
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diff
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|
1542 if self.servicetypes[info.type] > 1: |
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diff
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|
1543 self.servicetypes[info.type] -= 1 |
28298 | 1544 else: |
1545 del self.servicetypes[info.type] | |
1546 except KeyError: | |
1547 pass | |
1548 now = currentTimeMillis() | |
28419
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diff
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|
1549 nexttime = now |
28298 | 1550 i = 0 |
1551 while i < 3: | |
28419
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diff
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|
1552 if now < nexttime: |
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changeset
|
1553 self.wait(nexttime - now) |
28298 | 1554 now = currentTimeMillis() |
1555 continue | |
1556 out = DNSOutgoing(_FLAGS_QR_RESPONSE | _FLAGS_AA) | |
28299 | 1557 out.addAnswerAtTime( |
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1558 DNSPointer(info.type, _TYPE_PTR, _CLASS_IN, 0, info.name), 0 |
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1559 ) |
28299 | 1560 out.addAnswerAtTime( |
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|
1561 DNSService( |
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|
1562 info.name, |
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1563 _TYPE_SRV, |
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1564 _CLASS_IN, |
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|
1565 0, |
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1566 info.priority, |
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1567 info.weight, |
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|
1568 info.port, |
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1569 info.name, |
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1570 ), |
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1571 0, |
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1572 ) |
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1573 out.addAnswerAtTime( |
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1574 DNSText(info.name, _TYPE_TXT, _CLASS_IN, 0, info.text), 0 |
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1575 ) |
28298 | 1576 if info.address: |
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|
1577 out.addAnswerAtTime( |
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1578 DNSAddress( |
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1579 info.server, _TYPE_A, _CLASS_IN, 0, info.address |
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1580 ), |
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1581 0, |
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1582 ) |
28298 | 1583 self.send(out) |
1584 i += 1 | |
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|
1585 nexttime += _UNREGISTER_TIME |
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|
1586 |
28298 | 1587 def unregisterAllServices(self): |
1588 """Unregister all registered services.""" | |
1589 if len(self.services) > 0: | |
1590 now = currentTimeMillis() | |
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|
1591 nexttime = now |
28298 | 1592 i = 0 |
1593 while i < 3: | |
28419
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|
1594 if now < nexttime: |
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|
1595 self.wait(nexttime - now) |
28298 | 1596 now = currentTimeMillis() |
1597 continue | |
1598 out = DNSOutgoing(_FLAGS_QR_RESPONSE | _FLAGS_AA) | |
1599 for info in self.services.values(): | |
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1600 out.addAnswerAtTime( |
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1601 DNSPointer( |
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1602 info.type, _TYPE_PTR, _CLASS_IN, 0, info.name |
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1603 ), |
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|
1604 0, |
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Augie Fackler <augie@google.com>
parents:
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diff
changeset
|
1605 ) |
28299 | 1606 out.addAnswerAtTime( |
43076
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Augie Fackler <augie@google.com>
parents:
42551
diff
changeset
|
1607 DNSService( |
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diff
changeset
|
1608 info.name, |
2372284d9457
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Augie Fackler <augie@google.com>
parents:
42551
diff
changeset
|
1609 _TYPE_SRV, |
2372284d9457
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parents:
42551
diff
changeset
|
1610 _CLASS_IN, |
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|
1611 0, |
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Augie Fackler <augie@google.com>
parents:
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diff
changeset
|
1612 info.priority, |
2372284d9457
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Augie Fackler <augie@google.com>
parents:
42551
diff
changeset
|
1613 info.weight, |
2372284d9457
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Augie Fackler <augie@google.com>
parents:
42551
diff
changeset
|
1614 info.port, |
2372284d9457
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Augie Fackler <augie@google.com>
parents:
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diff
changeset
|
1615 info.server, |
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changeset
|
1616 ), |
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changeset
|
1617 0, |
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parents:
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diff
changeset
|
1618 ) |
2372284d9457
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parents:
42551
diff
changeset
|
1619 out.addAnswerAtTime( |
2372284d9457
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Augie Fackler <augie@google.com>
parents:
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changeset
|
1620 DNSText(info.name, _TYPE_TXT, _CLASS_IN, 0, info.text), |
2372284d9457
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parents:
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changeset
|
1621 0, |
2372284d9457
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Augie Fackler <augie@google.com>
parents:
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diff
changeset
|
1622 ) |
28298 | 1623 if info.address: |
43076
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parents:
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diff
changeset
|
1624 out.addAnswerAtTime( |
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Augie Fackler <augie@google.com>
parents:
42551
diff
changeset
|
1625 DNSAddress( |
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parents:
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diff
changeset
|
1626 info.server, _TYPE_A, _CLASS_IN, 0, info.address |
2372284d9457
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Augie Fackler <augie@google.com>
parents:
42551
diff
changeset
|
1627 ), |
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Augie Fackler <augie@google.com>
parents:
42551
diff
changeset
|
1628 0, |
2372284d9457
formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents:
42551
diff
changeset
|
1629 ) |
28298 | 1630 self.send(out) |
1631 i += 1 | |
28419
eb9d0e828c30
zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents:
28302
diff
changeset
|
1632 nexttime += _UNREGISTER_TIME |
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1633 |
28298 | 1634 def checkService(self, info): |
1635 """Checks the network for a unique service name, modifying the | |
1636 ServiceInfo passed in if it is not unique.""" | |
1637 now = currentTimeMillis() | |
28419
eb9d0e828c30
zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents:
28302
diff
changeset
|
1638 nexttime = now |
28298 | 1639 i = 0 |
1640 while i < 3: | |
1641 for record in self.cache.entriesWithName(info.type): | |
43076
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parents:
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|
1642 if ( |
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parents:
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diff
changeset
|
1643 record.type == _TYPE_PTR |
2372284d9457
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parents:
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changeset
|
1644 and not record.isExpired(now) |
2372284d9457
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parents:
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diff
changeset
|
1645 and record.alias == info.name |
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Augie Fackler <augie@google.com>
parents:
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diff
changeset
|
1646 ): |
43077
687b865b95ad
formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents:
43076
diff
changeset
|
1647 if info.name.find(b'.') < 0: |
44956
ba7eda4fcf8e
zeroconf: fix non existant formatting in the vendored zeroconf module
Pierre-Yves David <pierre-yves.david@octobus.net>
parents:
43735
diff
changeset
|
1648 info.name = b"%s.[%s:%d].%s" % ( |
43076
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parents:
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changeset
|
1649 info.name, |
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Augie Fackler <augie@google.com>
parents:
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diff
changeset
|
1650 info.address, |
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Augie Fackler <augie@google.com>
parents:
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diff
changeset
|
1651 info.port, |
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Augie Fackler <augie@google.com>
parents:
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diff
changeset
|
1652 info.type, |
2372284d9457
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parents:
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diff
changeset
|
1653 ) |
28298 | 1654 self.checkService(info) |
1655 return | |
1656 raise NonUniqueNameException | |
28419
eb9d0e828c30
zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents:
28302
diff
changeset
|
1657 if now < nexttime: |
eb9d0e828c30
zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents:
28302
diff
changeset
|
1658 self.wait(nexttime - now) |
28298 | 1659 now = currentTimeMillis() |
1660 continue | |
1661 out = DNSOutgoing(_FLAGS_QR_QUERY | _FLAGS_AA) | |
1662 self.debug = out | |
1663 out.addQuestion(DNSQuestion(info.type, _TYPE_PTR, _CLASS_IN)) | |
43076
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parents:
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changeset
|
1664 out.addAuthoritativeAnswer( |
2372284d9457
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Augie Fackler <augie@google.com>
parents:
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diff
changeset
|
1665 DNSPointer(info.type, _TYPE_PTR, _CLASS_IN, _DNS_TTL, info.name) |
2372284d9457
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parents:
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diff
changeset
|
1666 ) |
28298 | 1667 self.send(out) |
1668 i += 1 | |
28419
eb9d0e828c30
zeroconf: remove camelcase in identifiers
timeless <timeless@mozdev.org>
parents:
28302
diff
changeset
|
1669 nexttime += _CHECK_TIME |
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1670 |
28298 | 1671 def addListener(self, listener, question): |
1672 """Adds a listener for a given question. The listener will have | |
1673 its updateRecord method called when information is available to | |
1674 answer the question.""" | |
1675 now = currentTimeMillis() | |
1676 self.listeners.append(listener) | |
1677 if question is not None: | |
1678 for record in self.cache.entriesWithName(question.name): | |
1679 if question.answeredBy(record) and not record.isExpired(now): | |
1680 listener.updateRecord(self, now, record) | |
1681 self.notifyAll() | |
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1682 |
28298 | 1683 def removeListener(self, listener): |
1684 """Removes a listener.""" | |
1685 try: | |
1686 self.listeners.remove(listener) | |
1687 self.notifyAll() | |
1688 except Exception: | |
1689 pass | |
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1690 |
28298 | 1691 def updateRecord(self, now, rec): |
1692 """Used to notify listeners of new information that has updated | |
1693 a record.""" | |
1694 for listener in self.listeners: | |
1695 listener.updateRecord(self, now, rec) | |
1696 self.notifyAll() | |
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1697 |
28298 | 1698 def handleResponse(self, msg): |
1699 """Deal with incoming response packets. All answers | |
1700 are held in the cache, and listeners are notified.""" | |
1701 now = currentTimeMillis() | |
1702 for record in msg.answers: | |
1703 expired = record.isExpired(now) | |
1704 if record in self.cache.entries(): | |
1705 if expired: | |
1706 self.cache.remove(record) | |
1707 else: | |
1708 entry = self.cache.get(record) | |
1709 if entry is not None: | |
1710 entry.resetTTL(record) | |
1711 record = entry | |
1712 else: | |
1713 self.cache.add(record) | |
7877
eba7f12b0c51
cleanup: whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
7874
diff
changeset
|
1714 |
28298 | 1715 self.updateRecord(now, record) |
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1716 |
28298 | 1717 def handleQuery(self, msg, addr, port): |
1718 """Deal with incoming query packets. Provides a response if | |
1719 possible.""" | |
1720 out = None | |
7071
643c751e60b2
zeroconf: initial implementation
Matt Mackall <mpm@selenic.com>
parents:
diff
changeset
|
1721 |
28298 | 1722 # Support unicast client responses |
1723 # | |
1724 if port != _MDNS_PORT: | |
1725 out = DNSOutgoing(_FLAGS_QR_RESPONSE | _FLAGS_AA, 0) | |
1726 for question in msg.questions: | |
1727 out.addQuestion(question) | |
7874
d812029cda85
cleanup: drop variables for unused return values
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
7071
diff
changeset
|
1728 |
28298 | 1729 for question in msg.questions: |
1730 if question.type == _TYPE_PTR: | |
43077
687b865b95ad
formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents:
43076
diff
changeset
|
1731 if question.name == b"_services._dns-sd._udp.local.": |
28298 | 1732 for stype in self.servicetypes.keys(): |
1733 if out is None: | |
1734 out = DNSOutgoing(_FLAGS_QR_RESPONSE | _FLAGS_AA) | |
43076
2372284d9457
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parents:
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diff
changeset
|
1735 out.addAnswer( |
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Augie Fackler <augie@google.com>
parents:
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diff
changeset
|
1736 msg, |
2372284d9457
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Augie Fackler <augie@google.com>
parents:
42551
diff
changeset
|
1737 DNSPointer( |
43077
687b865b95ad
formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents:
43076
diff
changeset
|
1738 b"_services._dns-sd._udp.local.", |
43076
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Augie Fackler <augie@google.com>
parents:
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diff
changeset
|
1739 _TYPE_PTR, |
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Augie Fackler <augie@google.com>
parents:
42551
diff
changeset
|
1740 _CLASS_IN, |
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Augie Fackler <augie@google.com>
parents:
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diff
changeset
|
1741 _DNS_TTL, |
2372284d9457
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diff
changeset
|
1742 stype, |
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changeset
|
1743 ), |
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parents:
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diff
changeset
|
1744 ) |
28298 | 1745 for service in self.services.values(): |
1746 if question.name == service.type: | |
1747 if out is None: | |
1748 out = DNSOutgoing(_FLAGS_QR_RESPONSE | _FLAGS_AA) | |
43076
2372284d9457
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Augie Fackler <augie@google.com>
parents:
42551
diff
changeset
|
1749 out.addAnswer( |
2372284d9457
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Augie Fackler <augie@google.com>
parents:
42551
diff
changeset
|
1750 msg, |
2372284d9457
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parents:
42551
diff
changeset
|
1751 DNSPointer( |
2372284d9457
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parents:
42551
diff
changeset
|
1752 service.type, |
2372284d9457
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Augie Fackler <augie@google.com>
parents:
42551
diff
changeset
|
1753 _TYPE_PTR, |
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42551
diff
changeset
|
1754 _CLASS_IN, |
2372284d9457
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parents:
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diff
changeset
|
1755 _DNS_TTL, |
2372284d9457
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parents:
42551
diff
changeset
|
1756 service.name, |
2372284d9457
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Augie Fackler <augie@google.com>
parents:
42551
diff
changeset
|
1757 ), |
2372284d9457
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parents:
42551
diff
changeset
|
1758 ) |
28298 | 1759 else: |
1760 try: | |
1761 if out is None: | |
1762 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
|
1763 |
28298 | 1764 # Answer A record queries for any service addresses we know |
1765 if question.type == _TYPE_A or question.type == _TYPE_ANY: | |
1766 for service in self.services.values(): | |
1767 if service.server == question.name.lower(): | |
43076
2372284d9457
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parents:
42551
diff
changeset
|
1768 out.addAnswer( |
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Augie Fackler <augie@google.com>
parents:
42551
diff
changeset
|
1769 msg, |
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parents:
42551
diff
changeset
|
1770 DNSAddress( |
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parents:
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diff
changeset
|
1771 question.name, |
2372284d9457
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changeset
|
1772 _TYPE_A, |
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parents:
42551
diff
changeset
|
1773 _CLASS_IN | _CLASS_UNIQUE, |
2372284d9457
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parents:
42551
diff
changeset
|
1774 _DNS_TTL, |
2372284d9457
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parents:
42551
diff
changeset
|
1775 service.address, |
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parents:
42551
diff
changeset
|
1776 ), |
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parents:
42551
diff
changeset
|
1777 ) |
7874
d812029cda85
cleanup: drop variables for unused return values
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
7071
diff
changeset
|
1778 |
28298 | 1779 service = self.services.get(question.name.lower(), None) |
35629
31451f3f4b56
style: remove multiple statement on a single line in zeroconf
Boris Feld <boris.feld@octobus.net>
parents:
34447
diff
changeset
|
1780 if not service: |
31451f3f4b56
style: remove multiple statement on a single line in zeroconf
Boris Feld <boris.feld@octobus.net>
parents:
34447
diff
changeset
|
1781 continue |
7874
d812029cda85
cleanup: drop variables for unused return values
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
7071
diff
changeset
|
1782 |
43076
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Augie Fackler <augie@google.com>
parents:
42551
diff
changeset
|
1783 if question.type == _TYPE_SRV or question.type == _TYPE_ANY: |
2372284d9457
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Augie Fackler <augie@google.com>
parents:
42551
diff
changeset
|
1784 out.addAnswer( |
2372284d9457
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parents:
42551
diff
changeset
|
1785 msg, |
2372284d9457
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parents:
42551
diff
changeset
|
1786 DNSService( |
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parents:
42551
diff
changeset
|
1787 question.name, |
2372284d9457
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parents:
42551
diff
changeset
|
1788 _TYPE_SRV, |
2372284d9457
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parents:
42551
diff
changeset
|
1789 _CLASS_IN | _CLASS_UNIQUE, |
2372284d9457
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parents:
42551
diff
changeset
|
1790 _DNS_TTL, |
2372284d9457
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Augie Fackler <augie@google.com>
parents:
42551
diff
changeset
|
1791 service.priority, |
2372284d9457
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Augie Fackler <augie@google.com>
parents:
42551
diff
changeset
|
1792 service.weight, |
2372284d9457
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Augie Fackler <augie@google.com>
parents:
42551
diff
changeset
|
1793 service.port, |
2372284d9457
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Augie Fackler <augie@google.com>
parents:
42551
diff
changeset
|
1794 service.server, |
2372284d9457
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parents:
42551
diff
changeset
|
1795 ), |
2372284d9457
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parents:
42551
diff
changeset
|
1796 ) |
2372284d9457
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Augie Fackler <augie@google.com>
parents:
42551
diff
changeset
|
1797 if question.type == _TYPE_TXT or question.type == _TYPE_ANY: |
2372284d9457
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parents:
42551
diff
changeset
|
1798 out.addAnswer( |
2372284d9457
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Augie Fackler <augie@google.com>
parents:
42551
diff
changeset
|
1799 msg, |
2372284d9457
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parents:
42551
diff
changeset
|
1800 DNSText( |
2372284d9457
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parents:
42551
diff
changeset
|
1801 question.name, |
2372284d9457
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42551
diff
changeset
|
1802 _TYPE_TXT, |
2372284d9457
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parents:
42551
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1803 _CLASS_IN | _CLASS_UNIQUE, |
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1804 _DNS_TTL, |
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1805 service.text, |
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1806 ), |
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1807 ) |
28298 | 1808 if question.type == _TYPE_SRV: |
28299 | 1809 out.addAdditionalAnswer( |
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1810 DNSAddress( |
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1811 service.server, |
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1812 _TYPE_A, |
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1813 _CLASS_IN | _CLASS_UNIQUE, |
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1814 _DNS_TTL, |
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1815 service.address, |
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1816 ) |
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1817 ) |
28298 | 1818 except Exception: |
1819 traceback.print_exc() | |
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1820 |
28298 | 1821 if out is not None and out.answers: |
1822 out.id = msg.id | |
1823 self.send(out, addr, port) | |
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1824 |
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1825 def send(self, out, addr=_MDNS_ADDR, port=_MDNS_PORT): |
28298 | 1826 """Sends an outgoing packet.""" |
1827 # This is a quick test to see if we can parse the packets we generate | |
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1828 # temp = DNSIncoming(out.packet()) |
28298 | 1829 try: |
1830 self.socket.sendto(out.packet(), 0, (addr, port)) | |
1831 except Exception: | |
1832 # Ignore this, it may be a temporary loss of network connection | |
1833 pass | |
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1834 |
28298 | 1835 def close(self): |
1836 """Ends the background threads, and prevent this instance from | |
1837 servicing further queries.""" | |
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1838 if globals()[b'_GLOBAL_DONE'] == 0: |
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1839 globals()[b'_GLOBAL_DONE'] = 1 |
28298 | 1840 self.notifyAll() |
1841 self.engine.notify() | |
1842 self.unregisterAllServices() | |
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1843 self.socket.setsockopt( |
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1844 socket.SOL_IP, |
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1845 socket.IP_DROP_MEMBERSHIP, |
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1846 socket.inet_aton(_MDNS_ADDR) + socket.inet_aton('0.0.0.0'), |
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1847 ) |
28298 | 1848 self.socket.close() |
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1849 |
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1850 |
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1851 # Test a few module features, including service registration, service |
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1852 # query (for Zoe), and service unregistration. |
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1853 |
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1854 if __name__ == '__main__': |
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1855 print(b"Multicast DNS Service Discovery for Python, version", __version__) |
28298 | 1856 r = Zeroconf() |
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1857 print(b"1. Testing registration of a service...") |
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1858 desc = {b'version': b'0.10', b'a': b'test value', b'b': b'another value'} |
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1859 info = ServiceInfo( |
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1860 b"_http._tcp.local.", |
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1861 b"My Service Name._http._tcp.local.", |
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1862 socket.inet_aton(b"127.0.0.1"), |
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1863 1234, |
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1864 0, |
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1865 0, |
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1866 desc, |
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1867 ) |
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1868 print(b" Registering service...") |
28298 | 1869 r.registerService(info) |
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1870 print(b" Registration done.") |
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1871 print(b"2. Testing query of service information...") |
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1872 print( |
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1873 b" Getting ZOE service:", |
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1874 str(r.getServiceInfo(b"_http._tcp.local.", b"ZOE._http._tcp.local.")), |
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1875 ) |
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1876 print(b" Query done.") |
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1877 print(b"3. Testing query of own service...") |
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1878 print( |
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1879 b" Getting self:", |
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1880 str( |
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1881 r.getServiceInfo( |
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1882 b"_http._tcp.local.", b"My Service Name._http._tcp.local." |
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1883 ) |
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1884 ), |
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1885 ) |
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1886 print(b" Query done.") |
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1887 print(b"4. Testing unregister of service information...") |
28298 | 1888 r.unregisterService(info) |
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1889 print(b" Unregister done.") |
28298 | 1890 r.close() |