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1 | #!/usr/bin/env python | |
2 | import dns | |
3 | import clientsubnetoption | |
4 | from dnsdisttests import DNSDistTest | |
5 | ||
6 | class TestBasics(DNSDistTest): | |
7 | ||
8 | _config_template = """ | |
9 | newServer{address="127.0.0.1:%s"} | |
10 | truncateTC(true) | |
11 | addAction(QTypeRule(DNSQType.ANY), TCAction()) | |
12 | addAction(RegexRule("evil[0-9]{4,}\\\\.regex\\\\.tests\\\\.powerdns\\\\.com$"), RCodeAction(DNSRCode.REFUSED)) | |
13 | mySMN = newSuffixMatchNode() | |
14 | mySMN:add(newDNSName("nameAndQtype.tests.powerdns.com.")) | |
15 | addAction(AndRule{SuffixMatchNodeRule(mySMN), QTypeRule("TXT")}, RCodeAction(DNSRCode.NOTIMP)) | |
16 | addAction(QNameSuffixRule({"drop.test.powerdns.com.", "drop2.test.powerdns.com."}), DropAction()) | |
17 | addAction(AndRule({QTypeRule(DNSQType.A),QNameRule("ds9a.nl")}), SpoofAction("1.2.3.4")) | |
18 | addAction(newDNSName("dnsname.addaction.powerdns.com."), RCodeAction(DNSRCode.REFUSED)) | |
19 | addAction({newDNSName("dnsname-table1.addaction.powerdns.com."), newDNSName("dnsname-table2.addaction.powerdns.com.")}, RCodeAction(DNSRCode.REFUSED)) | |
20 | """ | |
21 | ||
22 | def testDropped(self): | |
23 | """ | |
24 | Basics: Dropped query | |
25 | ||
26 | Send an A query for drop.test.powerdns.com. domain, | |
27 | which is dropped by configuration. We expect | |
28 | no response. | |
29 | """ | |
30 | for name in ['drop.test.powerdns.com.', 'drop2.test.powerdns.com.']: | |
31 | query = dns.message.make_query(name, 'A', 'IN') | |
32 | for method in ("sendUDPQuery", "sendTCPQuery"): | |
33 | sender = getattr(self, method) | |
34 | (_, receivedResponse) = sender(query, response=None, useQueue=False) | |
35 | self.assertEqual(receivedResponse, None) | |
36 | ||
37 | def testAWithECS(self): | |
38 | """ | |
39 | Basics: A query with an ECS value | |
40 | """ | |
41 | name = 'awithecs.tests.powerdns.com.' | |
42 | ecso = clientsubnetoption.ClientSubnetOption('1.2.3.4') | |
43 | query = dns.message.make_query(name, 'A', 'IN', use_edns=True, options=[ecso]) | |
44 | response = dns.message.make_response(query) | |
45 | rrset = dns.rrset.from_text(name, | |
46 | 60, | |
47 | dns.rdataclass.IN, | |
48 | dns.rdatatype.A, | |
49 | '127.0.0.1') | |
50 | ||
51 | response.answer.append(rrset) | |
52 | ||
53 | for method in ("sendUDPQuery", "sendTCPQuery"): | |
54 | sender = getattr(self, method) | |
55 | (receivedQuery, receivedResponse) = sender(query, response) | |
56 | receivedQuery.id = query.id | |
57 | self.assertEqual(query, receivedQuery) | |
58 | self.assertEqual(response, receivedResponse) | |
59 | ||
60 | def testSimpleA(self): | |
61 | """ | |
62 | Basics: A query without EDNS | |
63 | """ | |
64 | name = 'simplea.tests.powerdns.com.' | |
65 | query = dns.message.make_query(name, 'A', 'IN', use_edns=False) | |
66 | response = dns.message.make_response(query) | |
67 | rrset = dns.rrset.from_text(name, | |
68 | 3600, | |
69 | dns.rdataclass.IN, | |
70 | dns.rdatatype.A, | |
71 | '127.0.0.1') | |
72 | response.answer.append(rrset) | |
73 | ||
74 | for method in ("sendUDPQuery", "sendTCPQuery"): | |
75 | sender = getattr(self, method) | |
76 | (receivedQuery, receivedResponse) = sender(query, response) | |
77 | self.assertTrue(receivedQuery) | |
78 | self.assertTrue(receivedResponse) | |
79 | receivedQuery.id = query.id | |
80 | self.assertEqual(query, receivedQuery) | |
81 | self.assertEqual(response, receivedResponse) | |
82 | ||
83 | def testAnyIsTruncated(self): | |
84 | """ | |
85 | Basics: Truncate ANY query | |
86 | ||
87 | dnsdist is configured to reply with TC to ANY queries, | |
88 | send an ANY query and check the result. | |
89 | It should be truncated over UDP, not over TCP. | |
90 | """ | |
91 | name = 'any.tests.powerdns.com.' | |
92 | query = dns.message.make_query(name, 'ANY', 'IN') | |
93 | # dnsdist sets RA = RD for TC responses | |
94 | query.flags &= ~dns.flags.RD | |
95 | expectedResponse = dns.message.make_response(query) | |
96 | expectedResponse.flags |= dns.flags.TC | |
97 | ||
98 | (_, receivedResponse) = self.sendUDPQuery(query, response=None, useQueue=False) | |
99 | self.assertEqual(receivedResponse, expectedResponse) | |
100 | ||
101 | response = dns.message.make_response(query) | |
102 | rrset = dns.rrset.from_text(name, | |
103 | 3600, | |
104 | dns.rdataclass.IN, | |
105 | dns.rdatatype.A, | |
106 | '127.0.0.1') | |
107 | ||
108 | response.answer.append(rrset) | |
109 | ||
110 | (receivedQuery, receivedResponse) = self.sendTCPQuery(query, response) | |
111 | self.assertTrue(receivedQuery) | |
112 | self.assertTrue(receivedResponse) | |
113 | receivedQuery.id = query.id | |
114 | self.assertEqual(query, receivedQuery) | |
115 | self.assertEqual(receivedResponse, response) | |
116 | ||
117 | def testTruncateTC(self): | |
118 | """ | |
119 | Basics: Truncate TC | |
120 | ||
121 | dnsdist is configured to truncate TC (default), | |
122 | we make the backend send responses | |
123 | with TC set and additional content, | |
124 | and check that the received response has been fixed. | |
125 | """ | |
126 | name = 'atruncatetc.tests.powerdns.com.' | |
127 | query = dns.message.make_query(name, 'A', 'IN') | |
128 | response = dns.message.make_response(query) | |
129 | rrset = dns.rrset.from_text(name, | |
130 | 3600, | |
131 | dns.rdataclass.IN, | |
132 | dns.rdatatype.A, | |
133 | '127.0.0.1') | |
134 | ||
135 | response.answer.append(rrset) | |
136 | response.flags |= dns.flags.TC | |
137 | expectedResponse = dns.message.make_response(query) | |
138 | expectedResponse.flags |= dns.flags.TC | |
139 | ||
140 | (receivedQuery, receivedResponse) = self.sendUDPQuery(query, response) | |
141 | receivedQuery.id = query.id | |
142 | self.assertEqual(query, receivedQuery) | |
143 | self.assertEqual(expectedResponse.flags, receivedResponse.flags) | |
144 | self.assertEqual(expectedResponse.question, receivedResponse.question) | |
145 | self.assertFalse(response.answer == receivedResponse.answer) | |
146 | self.assertEqual(len(receivedResponse.answer), 0) | |
147 | self.assertEqual(len(receivedResponse.authority), 0) | |
148 | self.assertEqual(len(receivedResponse.additional), 0) | |
149 | self.checkMessageNoEDNS(expectedResponse, receivedResponse) | |
150 | ||
151 | def testTruncateTCEDNS(self): | |
152 | """ | |
153 | Basics: Truncate TC with EDNS | |
154 | ||
155 | dnsdist is configured to truncate TC (default), | |
156 | we make the backend send responses | |
157 | with TC set and additional content, | |
158 | and check that the received response has been fixed. | |
159 | Note that the query and initial response had EDNS, | |
160 | so the final response should have it too. | |
161 | """ | |
162 | name = 'atruncatetc.tests.powerdns.com.' | |
163 | query = dns.message.make_query(name, 'A', 'IN', use_edns=True, payload=4096, want_dnssec=True) | |
164 | # force a different responder payload than the one in the query, | |
165 | # so we check that we don't just mirror it | |
166 | response = dns.message.make_response(query, our_payload=4242) | |
167 | rrset = dns.rrset.from_text(name, | |
168 | 3600, | |
169 | dns.rdataclass.IN, | |
170 | dns.rdatatype.A, | |
171 | '127.0.0.1') | |
172 | ||
173 | response.answer.append(rrset) | |
174 | response.flags |= dns.flags.TC | |
175 | expectedResponse = dns.message.make_response(query, our_payload=4242) | |
176 | expectedResponse.flags |= dns.flags.TC | |
177 | ||
178 | (receivedQuery, receivedResponse) = self.sendUDPQuery(query, response) | |
179 | receivedQuery.id = query.id | |
180 | self.assertEqual(query, receivedQuery) | |
181 | self.assertEqual(response.flags, receivedResponse.flags) | |
182 | self.assertEqual(response.question, receivedResponse.question) | |
183 | self.assertFalse(response.answer == receivedResponse.answer) | |
184 | self.assertEqual(len(receivedResponse.answer), 0) | |
185 | self.assertEqual(len(receivedResponse.authority), 0) | |
186 | self.assertEqual(len(receivedResponse.additional), 0) | |
187 | print(expectedResponse) | |
188 | print(receivedResponse) | |
189 | self.checkMessageEDNSWithoutOptions(expectedResponse, receivedResponse) | |
190 | self.assertFalse(receivedResponse.ednsflags & dns.flags.DO) | |
191 | self.assertEqual(receivedResponse.payload, 4242) | |
192 | ||
193 | def testRegexReturnsRefused(self): | |
194 | """ | |
195 | Basics: Refuse query matching regex | |
196 | ||
197 | dnsdist is configured to reply 'refused' for query | |
198 | matching "evil[0-9]{4,}\\.regex\\.tests\\.powerdns\\.com$". | |
199 | We send a query for evil4242.powerdns.com | |
200 | and check that the response is "refused". | |
201 | """ | |
202 | name = 'evil4242.regex.tests.powerdns.com.' | |
203 | query = dns.message.make_query(name, 'A', 'IN') | |
204 | query.flags &= ~dns.flags.RD | |
205 | expectedResponse = dns.message.make_response(query) | |
206 | expectedResponse.set_rcode(dns.rcode.REFUSED) | |
207 | ||
208 | for method in ("sendUDPQuery", "sendTCPQuery"): | |
209 | sender = getattr(self, method) | |
210 | (_, receivedResponse) = sender(query, response=None, useQueue=False) | |
211 | self.assertEqual(receivedResponse, expectedResponse) | |
212 | ||
213 | def testQNameReturnsSpoofed(self): | |
214 | """ | |
215 | Basics: test QNameRule and Spoof | |
216 | ||
217 | dnsdist is configured to reply 1.2.3.4 for A query for exactly ds9a.nl | |
218 | """ | |
219 | name = 'ds9a.nl.' | |
220 | query = dns.message.make_query(name, 'A', 'IN') | |
221 | query.flags &= ~dns.flags.RD | |
222 | expectedResponse = dns.message.make_response(query) | |
223 | expectedResponse.set_rcode(dns.rcode.NOERROR) | |
224 | rrset = dns.rrset.from_text(name, | |
225 | 3600, | |
226 | dns.rdataclass.IN, | |
227 | dns.rdatatype.A, | |
228 | '1.2.3.4') | |
229 | expectedResponse.answer.append(rrset) | |
230 | ||
231 | for method in ("sendUDPQuery", "sendTCPQuery"): | |
232 | sender = getattr(self, method) | |
233 | (_, receivedResponse) = sender(query, response=None, useQueue=False) | |
234 | self.assertEqual(receivedResponse, expectedResponse) | |
235 | ||
236 | def testDomainAndQTypeReturnsNotImplemented(self): | |
237 | """ | |
238 | Basics: NOTIMPL for specific name and qtype | |
239 | ||
240 | dnsdist is configured to reply 'not implemented' for query | |
241 | matching "nameAndQtype.tests.powerdns.com." AND qtype TXT. | |
242 | We send a TXT query for "nameAndQtype.powerdns.com." | |
243 | and check that the response is 'not implemented'. | |
244 | """ | |
245 | name = 'nameAndQtype.tests.powerdns.com.' | |
246 | query = dns.message.make_query(name, 'TXT', 'IN') | |
247 | query.flags &= ~dns.flags.RD | |
248 | expectedResponse = dns.message.make_response(query) | |
249 | expectedResponse.set_rcode(dns.rcode.NOTIMP) | |
250 | ||
251 | for method in ("sendUDPQuery", "sendTCPQuery"): | |
252 | sender = getattr(self, method) | |
253 | (_, receivedResponse) = sender(query, response=None, useQueue=False) | |
254 | self.assertEqual(receivedResponse, expectedResponse) | |
255 | ||
256 | def testDomainWithoutQTypeIsNotAffected(self): | |
257 | """ | |
258 | Basics: NOTIMPL qtype canary | |
259 | ||
260 | dnsdist is configured to reply 'not implemented' for query | |
261 | matching "nameAndQtype.tests.powerdns.com." AND qtype TXT. | |
262 | We send a A query for "nameAndQtype.tests.powerdns.com." | |
263 | and check that the response is OK. | |
264 | """ | |
265 | name = 'nameAndQtype.tests.powerdns.com.' | |
266 | query = dns.message.make_query(name, 'A', 'IN') | |
267 | response = dns.message.make_response(query) | |
268 | rrset = dns.rrset.from_text(name, | |
269 | 3600, | |
270 | dns.rdataclass.IN, | |
271 | dns.rdatatype.A, | |
272 | '127.0.0.1') | |
273 | response.answer.append(rrset) | |
274 | ||
275 | for method in ("sendUDPQuery", "sendTCPQuery"): | |
276 | sender = getattr(self, method) | |
277 | (receivedQuery, receivedResponse) = sender(query, response) | |
278 | self.assertTrue(receivedQuery) | |
279 | self.assertTrue(receivedResponse) | |
280 | receivedQuery.id = query.id | |
281 | self.assertEqual(query, receivedQuery) | |
282 | self.assertEqual(response, receivedResponse) | |
283 | ||
284 | def testOtherDomainANDQTypeIsNotAffected(self): | |
285 | """ | |
286 | Basics: NOTIMPL qname canary | |
287 | ||
288 | dnsdist is configured to reply 'not implemented' for query | |
289 | matching "nameAndQtype.tests.powerdns.com." AND qtype TXT. | |
290 | We send a TXT query for "OtherNameAndQtype.tests.powerdns.com." | |
291 | and check that the response is OK. | |
292 | """ | |
293 | name = 'OtherNameAndQtype.tests.powerdns.com.' | |
294 | query = dns.message.make_query(name, 'TXT', 'IN') | |
295 | response = dns.message.make_response(query) | |
296 | rrset = dns.rrset.from_text(name, | |
297 | 3600, | |
298 | dns.rdataclass.IN, | |
299 | dns.rdatatype.TXT, | |
300 | 'nothing to see here') | |
301 | response.answer.append(rrset) | |
302 | ||
303 | for method in ("sendUDPQuery", "sendTCPQuery"): | |
304 | sender = getattr(self, method) | |
305 | (receivedQuery, receivedResponse) = sender(query, response) | |
306 | self.assertTrue(receivedQuery) | |
307 | self.assertTrue(receivedResponse) | |
308 | receivedQuery.id = query.id | |
309 | self.assertEqual(query, receivedQuery) | |
310 | self.assertEqual(response, receivedResponse) | |
311 | ||
312 | def testWrongResponse(self): | |
313 | """ | |
314 | Basics: Unrelated response from the backend | |
315 | ||
316 | The backend send an unrelated answer over UDP, it should | |
317 | be discarded by dnsdist. It could happen if we wrap around | |
318 | maxOutstanding queries too quickly or have more than maxOutstanding | |
319 | queries to a specific backend in the air over UDP, | |
320 | but does not really make sense over TCP. | |
321 | """ | |
322 | name = 'query.unrelated.tests.powerdns.com.' | |
323 | unrelatedName = 'answer.unrelated.tests.powerdns.com.' | |
324 | query = dns.message.make_query(name, 'TXT', 'IN') | |
325 | unrelatedQuery = dns.message.make_query(unrelatedName, 'TXT', 'IN') | |
326 | unrelatedResponse = dns.message.make_response(unrelatedQuery) | |
327 | rrset = dns.rrset.from_text(unrelatedName, | |
328 | 3600, | |
329 | dns.rdataclass.IN, | |
330 | dns.rdatatype.TXT, | |
331 | 'nothing to see here') | |
332 | unrelatedResponse.answer.append(rrset) | |
333 | ||
334 | for method in ("sendUDPQuery", "sendTCPQuery"): | |
335 | sender = getattr(self, method) | |
336 | (receivedQuery, receivedResponse) = sender(query, unrelatedResponse) | |
337 | self.assertTrue(receivedQuery) | |
338 | self.assertEqual(receivedResponse, None) | |
339 | receivedQuery.id = query.id | |
340 | self.assertEqual(query, receivedQuery) | |
341 | ||
342 | def testHeaderOnlyRefused(self): | |
343 | """ | |
344 | Basics: Header-only refused response | |
345 | """ | |
346 | name = 'header-only-refused-response.tests.powerdns.com.' | |
347 | query = dns.message.make_query(name, 'A', 'IN') | |
348 | response = dns.message.make_response(query) | |
349 | response.set_rcode(dns.rcode.REFUSED) | |
350 | response.question = [] | |
351 | ||
352 | for method in ("sendUDPQuery", "sendTCPQuery"): | |
353 | sender = getattr(self, method) | |
354 | (receivedQuery, receivedResponse) = sender(query, response) | |
355 | self.assertTrue(receivedQuery) | |
356 | receivedQuery.id = query.id | |
357 | self.assertEqual(query, receivedQuery) | |
358 | self.assertEqual(receivedResponse, response) | |
359 | ||
360 | def testHeaderOnlyNoErrorResponse(self): | |
361 | """ | |
362 | Basics: Header-only NoError response should be dropped | |
363 | """ | |
364 | name = 'header-only-noerror-response.tests.powerdns.com.' | |
365 | query = dns.message.make_query(name, 'A', 'IN') | |
366 | response = dns.message.make_response(query) | |
367 | response.question = [] | |
368 | ||
369 | for method in ("sendUDPQuery", "sendTCPQuery"): | |
370 | sender = getattr(self, method) | |
371 | (receivedQuery, receivedResponse) = sender(query, response) | |
372 | self.assertTrue(receivedQuery) | |
373 | receivedQuery.id = query.id | |
374 | self.assertEqual(query, receivedQuery) | |
375 | self.assertEqual(receivedResponse, None) | |
376 | ||
377 | def testHeaderOnlyNXDResponse(self): | |
378 | """ | |
379 | Basics: Header-only NXD response should be dropped | |
380 | """ | |
381 | name = 'header-only-nxd-response.tests.powerdns.com.' | |
382 | query = dns.message.make_query(name, 'A', 'IN') | |
383 | response = dns.message.make_response(query) | |
384 | response.set_rcode(dns.rcode.NXDOMAIN) | |
385 | response.question = [] | |
386 | ||
387 | for method in ("sendUDPQuery", "sendTCPQuery"): | |
388 | sender = getattr(self, method) | |
389 | (receivedQuery, receivedResponse) = sender(query, response) | |
390 | self.assertTrue(receivedQuery) | |
391 | receivedQuery.id = query.id | |
392 | self.assertEqual(query, receivedQuery) | |
393 | self.assertEqual(receivedResponse, None) | |
394 | ||
395 | def testAddActionDNSName(self): | |
396 | """ | |
397 | Basics: test if addAction accepts a DNSName | |
398 | """ | |
399 | name = 'dnsname.addaction.powerdns.com.' | |
400 | query = dns.message.make_query(name, 'A', 'IN') | |
401 | query.flags &= ~dns.flags.RD | |
402 | expectedResponse = dns.message.make_response(query) | |
403 | expectedResponse.set_rcode(dns.rcode.REFUSED) | |
404 | ||
405 | for method in ("sendUDPQuery", "sendTCPQuery"): | |
406 | sender = getattr(self, method) | |
407 | (_, receivedResponse) = sender(query, response=None, useQueue=False) | |
408 | self.assertEqual(receivedResponse, expectedResponse) | |
409 | ||
410 | def testAddActionDNSNames(self): | |
411 | """ | |
412 | Basics: test if addAction accepts a table of DNSNames | |
413 | """ | |
414 | for name in ['dnsname-table{}.addaction.powerdns.com.'.format(i) for i in range(1,2)]: | |
415 | query = dns.message.make_query(name, 'A', 'IN') | |
416 | query.flags &= ~dns.flags.RD | |
417 | expectedResponse = dns.message.make_response(query) | |
418 | expectedResponse.set_rcode(dns.rcode.REFUSED) | |
419 | ||
420 | for method in ("sendUDPQuery", "sendTCPQuery"): | |
421 | sender = getattr(self, method) | |
422 | (_, receivedResponse) = sender(query, response=None, useQueue=False) | |
423 | self.assertEqual(receivedResponse, expectedResponse) | |
424 | ||
425 | def testEmptyQueries(self): | |
426 | """ | |
427 | Basic: NotImp on empty queries | |
428 | """ | |
429 | name = 'notimp-empty-queries.basic.tests.powerdns.com.' | |
430 | query = dns.message.Message() | |
431 | ||
432 | response = dns.message.make_response(query) | |
433 | response.set_rcode(dns.rcode.NOTIMP) | |
434 | ||
435 | for method in ("sendUDPQuery", "sendTCPQuery"): | |
436 | sender = getattr(self, method) | |
437 | (_, receivedResponse) = sender(query, response=None, useQueue=False) | |
438 | self.assertEqual(receivedResponse, response) |