1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
|
# -*- test-case-name: twisted.names.test -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Base functionality useful to various parts of Twisted Names.
"""
import socket
from twisted.names import dns
from twisted.names.error import DNSFormatError, DNSServerError, DNSNameError
from twisted.names.error import DNSNotImplementedError, DNSQueryRefusedError
from twisted.names.error import DNSUnknownError
from twisted.internet import defer, error
from twisted.python import failure
EMPTY_RESULT = (), (), ()
class ResolverBase:
"""
L{ResolverBase} is a base class for L{IResolver} implementations which
deals with a lot of the boilerplate of implementing all of the lookup
methods.
@cvar _errormap: A C{dict} mapping DNS protocol failure response codes
to exception classes which will be used to represent those failures.
"""
_errormap = {
dns.EFORMAT: DNSFormatError,
dns.ESERVER: DNSServerError,
dns.ENAME: DNSNameError,
dns.ENOTIMP: DNSNotImplementedError,
dns.EREFUSED: DNSQueryRefusedError}
typeToMethod = None
def __init__(self):
self.typeToMethod = {}
for (k, v) in typeToMethod.items():
self.typeToMethod[k] = getattr(self, v)
def exceptionForCode(self, responseCode):
"""
Convert a response code (one of the possible values of
L{dns.Message.rCode} to an exception instance representing it.
@since: 10.0
"""
return self._errormap.get(responseCode, DNSUnknownError)
def query(self, query, timeout = None):
try:
return self.typeToMethod[query.type](str(query.name), timeout)
except KeyError, e:
return defer.fail(failure.Failure(NotImplementedError(str(self.__class__) + " " + str(query.type))))
def _lookup(self, name, cls, type, timeout):
return defer.fail(NotImplementedError("ResolverBase._lookup"))
def lookupAddress(self, name, timeout = None):
"""
@see: twisted.names.client.lookupAddress
"""
return self._lookup(name, dns.IN, dns.A, timeout)
def lookupIPV6Address(self, name, timeout = None):
"""
@see: twisted.names.client.lookupIPV6Address
"""
return self._lookup(name, dns.IN, dns.AAAA, timeout)
def lookupAddress6(self, name, timeout = None):
"""
@see: twisted.names.client.lookupAddress6
"""
return self._lookup(name, dns.IN, dns.A6, timeout)
def lookupMailExchange(self, name, timeout = None):
"""
@see: twisted.names.client.lookupMailExchange
"""
return self._lookup(name, dns.IN, dns.MX, timeout)
def lookupNameservers(self, name, timeout = None):
"""
@see: twisted.names.client.lookupNameservers
"""
return self._lookup(name, dns.IN, dns.NS, timeout)
def lookupCanonicalName(self, name, timeout = None):
"""
@see: twisted.names.client.lookupCanonicalName
"""
return self._lookup(name, dns.IN, dns.CNAME, timeout)
def lookupMailBox(self, name, timeout = None):
"""
@see: twisted.names.client.lookupMailBox
"""
return self._lookup(name, dns.IN, dns.MB, timeout)
def lookupMailGroup(self, name, timeout = None):
"""
@see: twisted.names.client.lookupMailGroup
"""
return self._lookup(name, dns.IN, dns.MG, timeout)
def lookupMailRename(self, name, timeout = None):
"""
@see: twisted.names.client.lookupMailRename
"""
return self._lookup(name, dns.IN, dns.MR, timeout)
def lookupPointer(self, name, timeout = None):
"""
@see: twisted.names.client.lookupPointer
"""
return self._lookup(name, dns.IN, dns.PTR, timeout)
def lookupAuthority(self, name, timeout = None):
"""
@see: twisted.names.client.lookupAuthority
"""
return self._lookup(name, dns.IN, dns.SOA, timeout)
def lookupNull(self, name, timeout = None):
"""
@see: twisted.names.client.lookupNull
"""
return self._lookup(name, dns.IN, dns.NULL, timeout)
def lookupWellKnownServices(self, name, timeout = None):
"""
@see: twisted.names.client.lookupWellKnownServices
"""
return self._lookup(name, dns.IN, dns.WKS, timeout)
def lookupService(self, name, timeout = None):
"""
@see: twisted.names.client.lookupService
"""
return self._lookup(name, dns.IN, dns.SRV, timeout)
def lookupHostInfo(self, name, timeout = None):
"""
@see: twisted.names.client.lookupHostInfo
"""
return self._lookup(name, dns.IN, dns.HINFO, timeout)
def lookupMailboxInfo(self, name, timeout = None):
"""
@see: twisted.names.client.lookupMailboxInfo
"""
return self._lookup(name, dns.IN, dns.MINFO, timeout)
def lookupText(self, name, timeout = None):
"""
@see: twisted.names.client.lookupText
"""
return self._lookup(name, dns.IN, dns.TXT, timeout)
def lookupSenderPolicy(self, name, timeout = None):
"""
@see: twisted.names.client.lookupSenderPolicy
"""
return self._lookup(name, dns.IN, dns.SPF, timeout)
def lookupResponsibility(self, name, timeout = None):
"""
@see: twisted.names.client.lookupResponsibility
"""
return self._lookup(name, dns.IN, dns.RP, timeout)
def lookupAFSDatabase(self, name, timeout = None):
"""
@see: twisted.names.client.lookupAFSDatabase
"""
return self._lookup(name, dns.IN, dns.AFSDB, timeout)
def lookupZone(self, name, timeout = None):
"""
@see: twisted.names.client.lookupZone
"""
return self._lookup(name, dns.IN, dns.AXFR, timeout)
def lookupNamingAuthorityPointer(self, name, timeout=None):
"""
@see: twisted.names.client.lookupNamingAuthorityPointer
"""
return self._lookup(name, dns.IN, dns.NAPTR, timeout)
def lookupAllRecords(self, name, timeout = None):
"""
@see: twisted.names.client.lookupAllRecords
"""
return self._lookup(name, dns.IN, dns.ALL_RECORDS, timeout)
def getHostByName(self, name, timeout = None, effort = 10):
"""
@see: twisted.names.client.getHostByName
"""
# XXX - respect timeout
return self.lookupAllRecords(name, timeout
).addCallback(self._cbRecords, name, effort
)
def _cbRecords(self, (ans, auth, add), name, effort):
result = extractRecord(self, dns.Name(name), ans + auth + add, effort)
if not result:
raise error.DNSLookupError(name)
return result
def extractRecord(resolver, name, answers, level=10):
if not level:
return None
if hasattr(socket, 'inet_ntop'):
for r in answers:
if r.name == name and r.type == dns.A6:
return socket.inet_ntop(socket.AF_INET6, r.payload.address)
for r in answers:
if r.name == name and r.type == dns.AAAA:
return socket.inet_ntop(socket.AF_INET6, r.payload.address)
for r in answers:
if r.name == name and r.type == dns.A:
return socket.inet_ntop(socket.AF_INET, r.payload.address)
for r in answers:
if r.name == name and r.type == dns.CNAME:
result = extractRecord(
resolver, r.payload.name, answers, level - 1)
if not result:
return resolver.getHostByName(
str(r.payload.name), effort=level - 1)
return result
# No answers, but maybe there's a hint at who we should be asking about
# this
for r in answers:
if r.type == dns.NS:
from twisted.names import client
r = client.Resolver(servers=[(str(r.payload.name), dns.PORT)])
return r.lookupAddress(str(name)
).addCallback(
lambda (ans, auth, add):
extractRecord(r, name, ans + auth + add, level - 1))
typeToMethod = {
dns.A: 'lookupAddress',
dns.AAAA: 'lookupIPV6Address',
dns.A6: 'lookupAddress6',
dns.NS: 'lookupNameservers',
dns.CNAME: 'lookupCanonicalName',
dns.SOA: 'lookupAuthority',
dns.MB: 'lookupMailBox',
dns.MG: 'lookupMailGroup',
dns.MR: 'lookupMailRename',
dns.NULL: 'lookupNull',
dns.WKS: 'lookupWellKnownServices',
dns.PTR: 'lookupPointer',
dns.HINFO: 'lookupHostInfo',
dns.MINFO: 'lookupMailboxInfo',
dns.MX: 'lookupMailExchange',
dns.TXT: 'lookupText',
dns.SPF: 'lookupSenderPolicy',
dns.RP: 'lookupResponsibility',
dns.AFSDB: 'lookupAFSDatabase',
dns.SRV: 'lookupService',
dns.NAPTR: 'lookupNamingAuthorityPointer',
dns.AXFR: 'lookupZone',
dns.ALL_RECORDS: 'lookupAllRecords',
}
|
