1 # Unix SMB/CIFS implementation.
2 # Copyright (C) Kai Blin <kai@samba.org> 2011
4 # This program is free software; you can redistribute it and/or modify
5 # it under the terms of the GNU General Public License as published by
6 # the Free Software Foundation; either version 3 of the License, or
7 # (at your option) any later version.
9 # This program is distributed in the hope that it will be useful,
10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 # GNU General Public License for more details.
14 # You should have received a copy of the GNU General Public License
15 # along with this program. If not, see <http://www.gnu.org/licenses/>.
21 from samba
import socket
22 import samba
.ndr
as ndr
23 import samba
.dcerpc
.dns
as dns
24 from samba
.tests
import TestCase
26 class DNSTest(TestCase
):
28 def errstr(self
, errcode
):
29 "Return a readable error code"
44 return string_codes
[errcode
]
47 def assert_dns_rcode_equals(self
, packet
, rcode
):
48 "Helper function to check return code"
49 p_errcode
= packet
.operation
& 0x000F
50 self
.assertEquals(p_errcode
, rcode
, "Expected RCODE %s, got %s" % \
51 (self
.errstr(rcode
), self
.errstr(p_errcode
)))
53 def assert_dns_opcode_equals(self
, packet
, opcode
):
54 "Helper function to check opcode"
55 p_opcode
= packet
.operation
& 0x7800
56 self
.assertEquals(p_opcode
, opcode
, "Expected OPCODE %s, got %s" % \
59 def make_name_packet(self
, opcode
, qid
=None):
60 "Helper creating a dns.name_packet"
63 p
.id = random
.randint(0x0, 0xffff)
68 def finish_name_packet(self
, packet
, questions
):
69 "Helper to finalize a dns.name_packet"
70 packet
.qdcount
= len(questions
)
71 packet
.questions
= questions
73 def make_name_question(self
, name
, qtype
, qclass
):
74 "Helper creating a dns.name_question"
75 q
= dns
.name_question()
77 q
.question_type
= qtype
78 q
.question_class
= qclass
81 def get_dns_domain(self
):
82 "Helper to get dns domain"
83 return os
.getenv('REALM', 'example.com').lower()
85 def dns_transaction_udp(self
, packet
, host
=os
.getenv('SERVER_IP')):
86 "send a DNS query and read the reply"
89 send_packet
= ndr
.ndr_pack(packet
)
90 s
= socket
.socket(socket
.AF_INET
, socket
.SOCK_DGRAM
, 0)
92 s
.send(send_packet
, 0)
93 recv_packet
= s
.recv(2048, 0)
94 return ndr
.ndr_unpack(dns
.name_packet
, recv_packet
)
99 def dns_transaction_tcp(self
, packet
, host
=os
.getenv('SERVER_IP')):
100 "send a DNS query and read the reply"
103 send_packet
= ndr
.ndr_pack(packet
)
104 s
= socket
.socket(socket
.AF_INET
, socket
.SOCK_STREAM
, 0)
105 s
.connect((host
, 53))
106 tcp_packet
= struct
.pack('!H', len(send_packet
))
107 tcp_packet
+= send_packet
108 s
.send(tcp_packet
, 0)
109 recv_packet
= s
.recv(0xffff + 2, 0)
110 return ndr
.ndr_unpack(dns
.name_packet
, recv_packet
[2:])
115 class TestSimpleQueries(DNSTest
):
116 def test_one_a_query(self
):
117 "create a query packet containing one query record"
118 p
= self
.make_name_packet(dns
.DNS_OPCODE_QUERY
)
121 name
= "%s.%s" % (os
.getenv('SERVER'), self
.get_dns_domain())
122 q
= self
.make_name_question(name
, dns
.DNS_QTYPE_A
, dns
.DNS_QCLASS_IN
)
123 print "asking for ", q
.name
126 self
.finish_name_packet(p
, questions
)
127 response
= self
.dns_transaction_udp(p
)
128 self
.assert_dns_rcode_equals(response
, dns
.DNS_RCODE_OK
)
129 self
.assert_dns_opcode_equals(response
, dns
.DNS_OPCODE_QUERY
)
130 self
.assertEquals(response
.ancount
, 1)
131 self
.assertEquals(response
.answers
[0].rdata
,
132 os
.getenv('SERVER_IP'))
134 def test_one_a_query_tcp(self
):
135 "create a query packet containing one query record via TCP"
136 p
= self
.make_name_packet(dns
.DNS_OPCODE_QUERY
)
139 name
= "%s.%s" % (os
.getenv('SERVER'), self
.get_dns_domain())
140 q
= self
.make_name_question(name
, dns
.DNS_QTYPE_A
, dns
.DNS_QCLASS_IN
)
141 print "asking for ", q
.name
144 self
.finish_name_packet(p
, questions
)
145 response
= self
.dns_transaction_tcp(p
)
146 self
.assert_dns_rcode_equals(response
, dns
.DNS_RCODE_OK
)
147 self
.assert_dns_opcode_equals(response
, dns
.DNS_OPCODE_QUERY
)
148 self
.assertEquals(response
.ancount
, 1)
149 self
.assertEquals(response
.answers
[0].rdata
,
150 os
.getenv('SERVER_IP'))
152 def test_two_queries(self
):
153 "create a query packet containing two query records"
154 p
= self
.make_name_packet(dns
.DNS_OPCODE_QUERY
)
157 name
= "%s.%s" % (os
.getenv('SERVER'), self
.get_dns_domain())
158 q
= self
.make_name_question(name
, dns
.DNS_QTYPE_A
, dns
.DNS_QCLASS_IN
)
161 name
= "%s.%s" % ('bogusname', self
.get_dns_domain())
162 q
= self
.make_name_question(name
, dns
.DNS_QTYPE_A
, dns
.DNS_QCLASS_IN
)
165 self
.finish_name_packet(p
, questions
)
166 response
= self
.dns_transaction_udp(p
)
167 self
.assert_dns_rcode_equals(response
, dns
.DNS_RCODE_FORMERR
)
169 def test_qtype_all_query(self
):
170 "create a QTYPE_ALL query"
171 p
= self
.make_name_packet(dns
.DNS_OPCODE_QUERY
)
174 name
= "%s.%s" % (os
.getenv('SERVER'), self
.get_dns_domain())
175 q
= self
.make_name_question(name
, dns
.DNS_QTYPE_ALL
, dns
.DNS_QCLASS_IN
)
176 print "asking for ", q
.name
179 self
.finish_name_packet(p
, questions
)
180 response
= self
.dns_transaction_udp(p
)
183 dc_ipv6
= os
.getenv('SERVER_IPV6')
184 if dc_ipv6
is not None:
187 self
.assert_dns_rcode_equals(response
, dns
.DNS_RCODE_OK
)
188 self
.assert_dns_opcode_equals(response
, dns
.DNS_OPCODE_QUERY
)
189 self
.assertEquals(response
.ancount
, num_answers
)
190 self
.assertEquals(response
.answers
[0].rdata
,
191 os
.getenv('SERVER_IP'))
192 if dc_ipv6
is not None:
193 self
.assertEquals(response
.answers
[1].rdata
, dc_ipv6
)
195 def test_qclass_none_query(self
):
196 "create a QCLASS_NONE query"
197 p
= self
.make_name_packet(dns
.DNS_OPCODE_QUERY
)
200 name
= "%s.%s" % (os
.getenv('SERVER'), self
.get_dns_domain())
201 q
= self
.make_name_question(name
, dns
.DNS_QTYPE_ALL
, dns
.DNS_QCLASS_NONE
)
204 self
.finish_name_packet(p
, questions
)
205 response
= self
.dns_transaction_udp(p
)
206 self
.assert_dns_rcode_equals(response
, dns
.DNS_RCODE_NOTIMP
)
208 # Only returns an authority section entry in BIND and Win DNS
209 # FIXME: Enable one Samba implements this feature
210 # def test_soa_hostname_query(self):
211 # "create a SOA query for a hostname"
212 # p = self.make_name_packet(dns.DNS_OPCODE_QUERY)
215 # name = "%s.%s" % (os.getenv('SERVER'), self.get_dns_domain())
216 # q = self.make_name_question(name, dns.DNS_QTYPE_SOA, dns.DNS_QCLASS_IN)
217 # questions.append(q)
219 # self.finish_name_packet(p, questions)
220 # response = self.dns_transaction_udp(p)
221 # self.assert_dns_rcode_equals(response, dns.DNS_RCODE_OK)
222 # self.assert_dns_opcode_equals(response, dns.DNS_OPCODE_QUERY)
223 # # We don't get SOA records for single hosts
224 # self.assertEquals(response.ancount, 0)
226 def test_soa_domain_query(self
):
227 "create a SOA query for a domain"
228 p
= self
.make_name_packet(dns
.DNS_OPCODE_QUERY
)
231 name
= self
.get_dns_domain()
232 q
= self
.make_name_question(name
, dns
.DNS_QTYPE_SOA
, dns
.DNS_QCLASS_IN
)
235 self
.finish_name_packet(p
, questions
)
236 response
= self
.dns_transaction_udp(p
)
237 self
.assert_dns_rcode_equals(response
, dns
.DNS_RCODE_OK
)
238 self
.assert_dns_opcode_equals(response
, dns
.DNS_OPCODE_QUERY
)
239 self
.assertEquals(response
.ancount
, 1)
242 class TestDNSUpdates(DNSTest
):
243 def test_two_updates(self
):
244 "create two update requests"
245 p
= self
.make_name_packet(dns
.DNS_OPCODE_UPDATE
)
248 name
= "%s.%s" % (os
.getenv('SERVER'), self
.get_dns_domain())
249 u
= self
.make_name_question(name
, dns
.DNS_QTYPE_A
, dns
.DNS_QCLASS_IN
)
252 name
= self
.get_dns_domain()
253 u
= self
.make_name_question(name
, dns
.DNS_QTYPE_A
, dns
.DNS_QCLASS_IN
)
256 self
.finish_name_packet(p
, updates
)
257 response
= self
.dns_transaction_udp(p
)
258 self
.assert_dns_rcode_equals(response
, dns
.DNS_RCODE_FORMERR
)
260 def test_update_wrong_qclass(self
):
261 "create update with DNS_QCLASS_NONE"
262 p
= self
.make_name_packet(dns
.DNS_OPCODE_UPDATE
)
265 name
= self
.get_dns_domain()
266 u
= self
.make_name_question(name
, dns
.DNS_QTYPE_A
, dns
.DNS_QCLASS_NONE
)
269 self
.finish_name_packet(p
, updates
)
270 response
= self
.dns_transaction_udp(p
)
271 self
.assert_dns_rcode_equals(response
, dns
.DNS_RCODE_NOTIMP
)
273 def test_update_prereq_with_non_null_ttl(self
):
274 "test update with a non-null TTL"
275 p
= self
.make_name_packet(dns
.DNS_OPCODE_UPDATE
)
278 name
= self
.get_dns_domain()
280 u
= self
.make_name_question(name
, dns
.DNS_QTYPE_SOA
, dns
.DNS_QCLASS_IN
)
282 self
.finish_name_packet(p
, updates
)
286 r
.name
= "%s.%s" % (os
.getenv('SERVER'), self
.get_dns_domain())
287 r
.rr_type
= dns
.DNS_QTYPE_TXT
288 r
.rr_class
= dns
.DNS_QCLASS_NONE
293 p
.ancount
= len(prereqs
)
296 response
= self
.dns_transaction_udp(p
)
297 self
.assert_dns_rcode_equals(response
, dns
.DNS_RCODE_FORMERR
)
299 # I'd love to test this one, but it segfaults. :)
300 # def test_update_prereq_with_non_null_length(self):
301 # "test update with a non-null length"
302 # p = self.make_name_packet(dns.DNS_OPCODE_UPDATE)
305 # name = self.get_dns_domain()
307 # u = self.make_name_question(name, dns.DNS_QTYPE_SOA, dns.DNS_QCLASS_IN)
309 # self.finish_name_packet(p, updates)
313 # r.name = "%s.%s" % (os.getenv('SERVER'), self.get_dns_domain())
314 # r.rr_type = dns.DNS_QTYPE_TXT
315 # r.rr_class = dns.DNS_QCLASS_ANY
320 # p.ancount = len(prereqs)
321 # p.answers = prereqs
323 # response = self.dns_transaction_udp(p)
324 # self.assert_dns_rcode_equals(response, dns.DNS_RCODE_FORMERR)
326 def test_update_prereq_nonexisting_name(self
):
327 "test update with a nonexisting name"
328 p
= self
.make_name_packet(dns
.DNS_OPCODE_UPDATE
)
331 name
= self
.get_dns_domain()
333 u
= self
.make_name_question(name
, dns
.DNS_QTYPE_SOA
, dns
.DNS_QCLASS_IN
)
335 self
.finish_name_packet(p
, updates
)
339 r
.name
= "idontexist.%s" % self
.get_dns_domain()
340 r
.rr_type
= dns
.DNS_QTYPE_TXT
341 r
.rr_class
= dns
.DNS_QCLASS_ANY
346 p
.ancount
= len(prereqs
)
349 response
= self
.dns_transaction_udp(p
)
350 self
.assert_dns_rcode_equals(response
, dns
.DNS_RCODE_NXRRSET
)
352 def test_update_add_txt_record(self
):
353 "test adding records works"
354 p
= self
.make_name_packet(dns
.DNS_OPCODE_UPDATE
)
357 name
= self
.get_dns_domain()
359 u
= self
.make_name_question(name
, dns
.DNS_QTYPE_SOA
, dns
.DNS_QCLASS_IN
)
361 self
.finish_name_packet(p
, updates
)
365 r
.name
= "textrec.%s" % self
.get_dns_domain()
366 r
.rr_type
= dns
.DNS_QTYPE_TXT
367 r
.rr_class
= dns
.DNS_QCLASS_IN
370 r
.rdata
= dns
.txt_record()
371 r
.rdata
.txt
= '"This is a test"'
373 p
.nscount
= len(updates
)
376 response
= self
.dns_transaction_udp(p
)
377 self
.assert_dns_rcode_equals(response
, dns
.DNS_RCODE_OK
)
379 p
= self
.make_name_packet(dns
.DNS_OPCODE_QUERY
)
382 name
= "textrec.%s" % self
.get_dns_domain()
383 q
= self
.make_name_question(name
, dns
.DNS_QTYPE_TXT
, dns
.DNS_QCLASS_IN
)
386 self
.finish_name_packet(p
, questions
)
387 response
= self
.dns_transaction_udp(p
)
388 self
.assert_dns_rcode_equals(response
, dns
.DNS_RCODE_OK
)
389 self
.assertEquals(response
.ancount
, 1)
390 self
.assertEquals(response
.answers
[0].rdata
.txt
, '"This is a test"')
392 def test_update_add_two_txt_records(self
):
393 "test adding two txt records works"
394 p
= self
.make_name_packet(dns
.DNS_OPCODE_UPDATE
)
397 name
= self
.get_dns_domain()
399 u
= self
.make_name_question(name
, dns
.DNS_QTYPE_SOA
, dns
.DNS_QCLASS_IN
)
401 self
.finish_name_packet(p
, updates
)
405 r
.name
= "textrec2.%s" % self
.get_dns_domain()
406 r
.rr_type
= dns
.DNS_QTYPE_TXT
407 r
.rr_class
= dns
.DNS_QCLASS_IN
410 r
.rdata
= dns
.txt_record()
411 r
.rdata
.txt
= '"This is a test" "and this is a test, too"'
413 p
.nscount
= len(updates
)
416 response
= self
.dns_transaction_udp(p
)
417 self
.assert_dns_rcode_equals(response
, dns
.DNS_RCODE_OK
)
419 p
= self
.make_name_packet(dns
.DNS_OPCODE_QUERY
)
422 name
= "textrec2.%s" % self
.get_dns_domain()
423 q
= self
.make_name_question(name
, dns
.DNS_QTYPE_TXT
, dns
.DNS_QCLASS_IN
)
426 self
.finish_name_packet(p
, questions
)
427 response
= self
.dns_transaction_udp(p
)
428 self
.assert_dns_rcode_equals(response
, dns
.DNS_RCODE_OK
)
429 self
.assertEquals(response
.ancount
, 1)
430 self
.assertEquals(response
.answers
[0].rdata
.txt
, '"This is a test" "and this is a test, too"')
433 def test_delete_record(self
):
434 "Test if deleting records works"
435 p
= self
.make_name_packet(dns
.DNS_OPCODE_UPDATE
)
438 name
= self
.get_dns_domain()
440 u
= self
.make_name_question(name
, dns
.DNS_QTYPE_SOA
, dns
.DNS_QCLASS_IN
)
442 self
.finish_name_packet(p
, updates
)
446 r
.name
= "textrec.%s" % self
.get_dns_domain()
447 r
.rr_type
= dns
.DNS_QTYPE_TXT
448 r
.rr_class
= dns
.DNS_QCLASS_NONE
451 r
.rdata
= dns
.txt_record()
452 r
.rdata
.txt
= '"This is a test"'
454 p
.nscount
= len(updates
)
457 response
= self
.dns_transaction_udp(p
)
458 self
.assert_dns_rcode_equals(response
, dns
.DNS_RCODE_OK
)
460 p
= self
.make_name_packet(dns
.DNS_OPCODE_QUERY
)
463 name
= "textrec.%s" % self
.get_dns_domain()
464 q
= self
.make_name_question(name
, dns
.DNS_QTYPE_TXT
, dns
.DNS_QCLASS_IN
)
467 self
.finish_name_packet(p
, questions
)
468 response
= self
.dns_transaction_udp(p
)
469 self
.assert_dns_rcode_equals(response
, dns
.DNS_RCODE_NXDOMAIN
)
472 class TestComplexQueries(DNSTest
):
474 super(TestComplexQueries
, self
).setUp()
475 p
= self
.make_name_packet(dns
.DNS_OPCODE_UPDATE
)
478 name
= self
.get_dns_domain()
480 u
= self
.make_name_question(name
, dns
.DNS_QTYPE_SOA
, dns
.DNS_QCLASS_IN
)
482 self
.finish_name_packet(p
, updates
)
486 r
.name
= "cname_test.%s" % self
.get_dns_domain()
487 r
.rr_type
= dns
.DNS_QTYPE_CNAME
488 r
.rr_class
= dns
.DNS_QCLASS_IN
491 r
.rdata
= "%s.%s" % (os
.getenv('SERVER'), self
.get_dns_domain())
493 p
.nscount
= len(updates
)
496 response
= self
.dns_transaction_udp(p
)
497 self
.assert_dns_rcode_equals(response
, dns
.DNS_RCODE_OK
)
500 super(TestComplexQueries
, self
).tearDown()
501 p
= self
.make_name_packet(dns
.DNS_OPCODE_UPDATE
)
504 name
= self
.get_dns_domain()
506 u
= self
.make_name_question(name
, dns
.DNS_QTYPE_SOA
, dns
.DNS_QCLASS_IN
)
508 self
.finish_name_packet(p
, updates
)
512 r
.name
= "cname_test.%s" % self
.get_dns_domain()
513 r
.rr_type
= dns
.DNS_QTYPE_CNAME
514 r
.rr_class
= dns
.DNS_QCLASS_NONE
517 r
.rdata
= "%s.%s" % (os
.getenv('SERVER'), self
.get_dns_domain())
519 p
.nscount
= len(updates
)
522 response
= self
.dns_transaction_udp(p
)
523 self
.assert_dns_rcode_equals(response
, dns
.DNS_RCODE_OK
)
525 def test_one_a_query(self
):
526 "create a query packet containing one query record"
527 p
= self
.make_name_packet(dns
.DNS_OPCODE_QUERY
)
530 name
= "cname_test.%s" % self
.get_dns_domain()
531 q
= self
.make_name_question(name
, dns
.DNS_QTYPE_A
, dns
.DNS_QCLASS_IN
)
532 print "asking for ", q
.name
535 self
.finish_name_packet(p
, questions
)
536 response
= self
.dns_transaction_udp(p
)
537 self
.assert_dns_rcode_equals(response
, dns
.DNS_RCODE_OK
)
538 self
.assert_dns_opcode_equals(response
, dns
.DNS_OPCODE_QUERY
)
539 self
.assertEquals(response
.ancount
, 2)
540 self
.assertEquals(response
.answers
[0].rr_type
, dns
.DNS_QTYPE_CNAME
)
541 self
.assertEquals(response
.answers
[0].rdata
, "%s.%s" %
542 (os
.getenv('SERVER'), self
.get_dns_domain()))
543 self
.assertEquals(response
.answers
[1].rr_type
, dns
.DNS_QTYPE_A
)
544 self
.assertEquals(response
.answers
[1].rdata
,
545 os
.getenv('SERVER_IP'))
548 if __name__
== "__main__":