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
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
|
# -*- coding: utf-8
# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
# Copyright (C) 2003-2007, 2009-2011 Nominum, Inc.
#
# Permission to use, copy, modify, and distribute this software and its
# documentation for any purpose with or without fee is hereby granted,
# provided that the above copyright notice and this permission notice
# appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
import operator
import struct
import unittest
from io import BytesIO
import dns.edns
import dns.wire
class OptionTestCase(unittest.TestCase):
def testGenericOption(self):
opt = dns.edns.GenericOption(3, b"data")
io = BytesIO()
opt.to_wire(io)
data = io.getvalue()
self.assertEqual(data, b"data")
self.assertEqual(dns.edns.option_from_wire(3, data, 0, len(data)), opt)
self.assertEqual(str(opt), "Generic 3")
def testECSOption_prefix_length(self):
opt = dns.edns.ECSOption("1.2.255.33", 20)
io = BytesIO()
opt.to_wire(io)
data = io.getvalue()
self.assertEqual(data, b"\x00\x01\x14\x00\x01\x02\xf0")
def testECSOption(self):
opt = dns.edns.ECSOption("1.2.3.4", 24)
io = BytesIO()
opt.to_wire(io)
data = io.getvalue()
self.assertEqual(data, b"\x00\x01\x18\x00\x01\x02\x03")
# default srclen
opt = dns.edns.ECSOption("1.2.3.4")
io = BytesIO()
opt.to_wire(io)
data = io.getvalue()
self.assertEqual(data, b"\x00\x01\x18\x00\x01\x02\x03")
self.assertEqual(opt.to_text(), "ECS 1.2.3.4/24 scope/0")
def testECSOption25(self):
opt = dns.edns.ECSOption("1.2.3.255", 25)
io = BytesIO()
opt.to_wire(io)
data = io.getvalue()
self.assertEqual(data, b"\x00\x01\x19\x00\x01\x02\x03\x80")
opt2 = dns.edns.option_from_wire(dns.edns.ECS, data, 0, len(data))
self.assertEqual(opt2.otype, dns.edns.ECS)
self.assertEqual(opt2.address, "1.2.3.128")
self.assertEqual(opt2.srclen, 25)
self.assertEqual(opt2.scopelen, 0)
def testECSOption_v6(self):
opt = dns.edns.ECSOption("2001:4b98::1")
io = BytesIO()
opt.to_wire(io)
data = io.getvalue()
self.assertEqual(data, b"\x00\x02\x38\x00\x20\x01\x4b\x98\x00\x00\x00")
opt2 = dns.edns.option_from_wire(dns.edns.ECS, data, 0, len(data))
self.assertEqual(opt2.otype, dns.edns.ECS)
self.assertEqual(opt2.address, "2001:4b98::")
self.assertEqual(opt2.srclen, 56)
self.assertEqual(opt2.scopelen, 0)
def testECSOption_from_text_valid(self):
ecs1 = dns.edns.ECSOption.from_text("1.2.3.4/24/0")
self.assertEqual(ecs1, dns.edns.ECSOption("1.2.3.4", 24, 0))
ecs2 = dns.edns.ECSOption.from_text("1.2.3.4/24")
self.assertEqual(ecs2, dns.edns.ECSOption("1.2.3.4", 24, 0))
ecs3 = dns.edns.ECSOption.from_text("ECS 1.2.3.4/24")
self.assertEqual(ecs3, dns.edns.ECSOption("1.2.3.4", 24, 0))
ecs4 = dns.edns.ECSOption.from_text("ECS 1.2.3.4/24/32")
self.assertEqual(ecs4, dns.edns.ECSOption("1.2.3.4", 24, 32))
ecs5 = dns.edns.ECSOption.from_text("2001:4b98::1/64/56")
self.assertEqual(ecs5, dns.edns.ECSOption("2001:4b98::1", 64, 56))
ecs6 = dns.edns.ECSOption.from_text("2001:4b98::1/64")
self.assertEqual(ecs6, dns.edns.ECSOption("2001:4b98::1", 64, 0))
ecs7 = dns.edns.ECSOption.from_text("ECS 2001:4b98::1/0")
self.assertEqual(ecs7, dns.edns.ECSOption("2001:4b98::1", 0, 0))
ecs8 = dns.edns.ECSOption.from_text("ECS 2001:4b98::1/64/128")
self.assertEqual(ecs8, dns.edns.ECSOption("2001:4b98::1", 64, 128))
def testECSOption_from_text_invalid(self):
with self.assertRaises(ValueError):
dns.edns.ECSOption.from_text("some random text 1.2.3.4/24/0 24")
with self.assertRaises(ValueError):
dns.edns.ECSOption.from_text("1.2.3.4/twentyfour")
with self.assertRaises(ValueError):
dns.edns.ECSOption.from_text("BOGUS 1.2.3.4/5/6/7")
with self.assertRaises(ValueError):
dns.edns.ECSOption.from_text("1.2.3.4/5/6/7")
with self.assertRaises(ValueError):
dns.edns.ECSOption.from_text("1.2.3.4/24/O") # <-- that's not a zero
with self.assertRaises(ValueError):
dns.edns.ECSOption.from_text("")
with self.assertRaises(ValueError):
dns.edns.ECSOption.from_text("1.2.3.4/2001:4b98::1/24")
def testECSOption_from_wire_invalid(self):
with self.assertRaises(ValueError):
opt = dns.edns.option_from_wire(
dns.edns.ECS, b"\x00\xff\x18\x00\x01\x02\x03", 0, 7
)
def testEDEOption(self):
opt = dns.edns.EDEOption(3)
io = BytesIO()
opt.to_wire(io)
data = io.getvalue()
self.assertEqual(data, b"\x00\x03")
self.assertEqual(str(opt), "EDE 3 (Stale Answer)")
# with text
opt = dns.edns.EDEOption(16, "test")
io = BytesIO()
opt.to_wire(io)
data = io.getvalue()
self.assertEqual(data, b"\x00\x10test")
def testEDEOption_invalid(self):
with self.assertRaises(ValueError):
opt = dns.edns.EDEOption(-1)
with self.assertRaises(ValueError):
opt = dns.edns.EDEOption(65536)
with self.assertRaises(ValueError):
opt = dns.edns.EDEOption(0, 0)
def testEDEOption_from_wire(self):
data = b"\x00\01"
self.assertEqual(
dns.edns.option_from_wire(dns.edns.EDE, data, 0, 2), dns.edns.EDEOption(1)
)
data = b"\x00\01test"
self.assertEqual(
dns.edns.option_from_wire(dns.edns.EDE, data, 0, 6),
dns.edns.EDEOption(1, "test"),
)
# utf-8 text MAY be null-terminated
data = b"\x00\01test\x00"
self.assertEqual(
dns.edns.option_from_wire(dns.edns.EDE, data, 0, 7),
dns.edns.EDEOption(1, "test"),
)
def test_basic_relations(self):
o1 = dns.edns.ECSOption.from_text("1.2.3.0/24/0")
o2 = dns.edns.ECSOption.from_text("1.2.4.0/24/0")
self.assertTrue(o1 == o1)
self.assertTrue(o1 != o2)
self.assertTrue(o1 < o2)
self.assertTrue(o1 <= o2)
self.assertTrue(o2 > o1)
self.assertTrue(o2 >= o1)
o1 = dns.edns.ECSOption.from_text("1.2.4.0/23/0")
o2 = dns.edns.ECSOption.from_text("1.2.4.0/24/0")
self.assertTrue(o1 < o2)
o1 = dns.edns.ECSOption.from_text("1.2.4.0/24/0")
o2 = dns.edns.ECSOption.from_text("1.2.4.0/24/1")
self.assertTrue(o1 < o2)
def test_incompatible_relations(self):
o1 = dns.edns.GenericOption(3, b"data")
o2 = dns.edns.ECSOption.from_text("1.2.3.5/24/0")
for oper in [operator.lt, operator.le, operator.ge, operator.gt]:
self.assertRaises(TypeError, lambda: oper(o1, o2))
self.assertFalse(o1 == o2)
self.assertTrue(o1 != o2)
self.assertFalse(o1 == 123)
self.assertTrue(o1 != 123)
def testNSIDOption(self):
opt = dns.edns.NSIDOption(b"testing")
io = BytesIO()
opt.to_wire(io)
data = io.getvalue()
self.assertEqual(data, b"testing")
self.assertEqual(str(opt), "NSID testing")
opt = dns.edns.NSIDOption(b"\xfe\xff")
io = BytesIO()
opt.to_wire(io)
data = io.getvalue()
self.assertEqual(data, b"\xfe\xff")
self.assertEqual(str(opt), "NSID feff")
o = dns.edns.option_from_wire(dns.edns.OptionType.NSID, data, 0, len(data))
self.assertEqual(o.nsid, b"\xfe\xff")
def testCookieOption(self):
opt = dns.edns.CookieOption(b"12345678", b"")
io = BytesIO()
opt.to_wire(io)
data = io.getvalue()
self.assertEqual(data, b"12345678")
self.assertEqual(str(opt), "COOKIE 3132333435363738")
opt = dns.edns.CookieOption(b"12345678", b"abcdefgh")
data = opt.to_wire()
self.assertEqual(data, b"12345678abcdefgh")
self.assertEqual(str(opt), "COOKIE 31323334353637386162636465666768")
# maximal server
opt = dns.edns.CookieOption(b"12345678", b"abcdefghabcdefghabcdefghabcdefgh")
io = BytesIO()
opt.to_wire(io)
data = io.getvalue()
self.assertEqual(data, b"12345678abcdefghabcdefghabcdefghabcdefgh")
# from wire
opt2 = dns.edns.option_from_wire(dns.edns.OptionType.COOKIE, data, 0, len(data))
self.assertEqual(opt.client, opt2.client)
self.assertEqual(opt.server, opt2.server)
# client too short
with self.assertRaises(ValueError):
opt = dns.edns.CookieOption(b"1234567", b"")
# client too long
with self.assertRaises(ValueError):
opt = dns.edns.CookieOption(b"123456789", b"")
# server too short
with self.assertRaises(ValueError):
opt = dns.edns.CookieOption(b"12345678", b"a")
# server too long
with self.assertRaises(ValueError):
opt = dns.edns.CookieOption(
b"12345678", b"abcdefghabcdefghabcdefghabcdefghi"
)
def testReportChannelOption(self):
agent_domain = dns.name.from_text("agent.example.")
expected_wire = b"\x05agent\x07example\x00"
opt = dns.edns.ReportChannelOption(agent_domain)
io = BytesIO()
opt.to_wire(io)
data = io.getvalue()
self.assertEqual(data, expected_wire)
self.assertEqual(str(opt), "REPORTCHANNEL agent.example.")
opt2 = dns.edns.option_from_wire(
dns.edns.OptionType.REPORTCHANNEL, expected_wire, 0, len(expected_wire)
)
self.assertEqual(opt2.agent_domain, agent_domain)
def test_option_registration(self):
U32OptionType = 9999
class U32Option(dns.edns.Option):
def __init__(self, value=None):
super().__init__(U32OptionType)
self.value = value
def to_wire(self, file=None):
data = struct.pack("!I", self.value)
if file:
file.write(data)
else:
return data
@classmethod
def from_wire_parser(cls, otype, parser):
(value,) = parser.get_struct("!I")
return cls(value)
try:
dns.edns.register_type(U32Option, U32OptionType)
generic = dns.edns.GenericOption(U32OptionType, b"\x00\x00\x00\x01")
wire1 = generic.to_wire()
u32 = dns.edns.option_from_wire_parser(
U32OptionType, dns.wire.Parser(wire1)
)
self.assertEqual(u32.value, 1)
wire2 = u32.to_wire()
self.assertEqual(wire1, wire2)
self.assertEqual(u32, generic)
finally:
dns.edns._type_to_class.pop(U32OptionType, None)
opt = dns.edns.option_from_wire_parser(9999, dns.wire.Parser(wire1))
self.assertEqual(opt, generic)
|
