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
|
require 'test/unit'
require 'resolv'
require 'socket'
require 'tempfile'
class TestResolvDNS < Test::Unit::TestCase
def setup
@save_do_not_reverse_lookup = BasicSocket.do_not_reverse_lookup
BasicSocket.do_not_reverse_lookup = true
end
def teardown
BasicSocket.do_not_reverse_lookup = @save_do_not_reverse_lookup
end
def with_udp(host, port)
u = UDPSocket.new
begin
u.bind(host, port)
yield u
ensure
u.close
end
end
# [ruby-core:65836]
def test_resolve_with_2_ndots
conf = Resolv::DNS::Config.new :nameserver => ['127.0.0.1'], :ndots => 2
assert conf.single?
candidates = []
conf.resolv('example.com') { |candidate, *args|
candidates << candidate
raise Resolv::DNS::Config::NXDomain
}
n = Resolv::DNS::Name.create 'example.com.'
assert_equal n, candidates.last
end
def test_query_ipv4_address
begin
OpenSSL
rescue LoadError
skip 'autoload problem. see [ruby-dev:45021][Bug #5786]'
end if defined?(OpenSSL)
with_udp('127.0.0.1', 0) {|u|
_, server_port, _, server_address = u.addr
begin
client_thread = Thread.new {
Resolv::DNS.open(:nameserver_port => [[server_address, server_port]]) {|dns|
dns.getresources("foo.example.org", Resolv::DNS::Resource::IN::A)
}
}
server_thread = Thread.new {
msg, (_, client_port, _, client_address) = timeout(5) {u.recvfrom(4096)}
id, word2, qdcount, ancount, nscount, arcount = msg.unpack("nnnnnn")
qr = (word2 & 0x8000) >> 15
opcode = (word2 & 0x7800) >> 11
aa = (word2 & 0x0400) >> 10
tc = (word2 & 0x0200) >> 9
rd = (word2 & 0x0100) >> 8
ra = (word2 & 0x0080) >> 7
z = (word2 & 0x0070) >> 4
rcode = word2 & 0x000f
rest = msg[12..-1]
assert_equal(0, qr) # 0:query 1:response
assert_equal(0, opcode) # 0:QUERY 1:IQUERY 2:STATUS
assert_equal(0, aa) # Authoritative Answer
assert_equal(0, tc) # TrunCation
assert_equal(1, rd) # Recursion Desired
assert_equal(0, ra) # Recursion Available
assert_equal(0, z) # Reserved for future use
assert_equal(0, rcode) # 0:No-error 1:Format-error 2:Server-failure 3:Name-Error 4:Not-Implemented 5:Refused
assert_equal(1, qdcount) # number of entries in the question section.
assert_equal(0, ancount) # number of entries in the answer section.
assert_equal(0, nscount) # number of entries in the authority records section.
assert_equal(0, arcount) # number of entries in the additional records section.
name = [3, "foo", 7, "example", 3, "org", 0].pack("Ca*Ca*Ca*C")
assert_operator(rest, :start_with?, name)
rest = rest[name.length..-1]
assert_equal(4, rest.length)
qtype, _ = rest.unpack("nn")
assert_equal(1, qtype) # A
assert_equal(1, qtype) # IN
id = id
qr = 1
opcode = opcode
aa = 0
tc = 0
rd = rd
ra = 1
z = 0
rcode = 0
qdcount = 0
ancount = 1
nscount = 0
arcount = 0
word2 = (qr << 15) |
(opcode << 11) |
(aa << 10) |
(tc << 9) |
(rd << 8) |
(ra << 7) |
(z << 4) |
rcode
msg = [id, word2, qdcount, ancount, nscount, arcount].pack("nnnnnn")
type = 1
klass = 1
ttl = 3600
rdlength = 4
rdata = [192,0,2,1].pack("CCCC") # 192.0.2.1 (TEST-NET address) RFC 3330
rr = [name, type, klass, ttl, rdlength, rdata].pack("a*nnNna*")
msg << rr
u.send(msg, 0, client_address, client_port)
}
result, _ = assert_join_threads([client_thread, server_thread])
assert_instance_of(Array, result)
assert_equal(1, result.length)
rr = result[0]
assert_instance_of(Resolv::DNS::Resource::IN::A, rr)
assert_instance_of(Resolv::IPv4, rr.address)
assert_equal("192.0.2.1", rr.address.to_s)
assert_equal(3600, rr.ttl)
end
}
end
def test_query_ipv4_address_timeout
with_udp('127.0.0.1', 0) {|u|
_, port , _, host = u.addr
start = nil
rv = Resolv::DNS.open(:nameserver_port => [[host, port]]) {|dns|
dns.timeouts = 0.1
start = Time.now
dns.getresources("foo.example.org", Resolv::DNS::Resource::IN::A)
}
t2 = Time.now
diff = t2 - start
assert rv.empty?, "unexpected: #{rv.inspect} (expected empty)"
assert_operator 0.1, :<=, diff
rv = Resolv::DNS.open(:nameserver_port => [[host, port]]) {|dns|
dns.timeouts = [ 0.1, 0.2 ]
start = Time.now
dns.getresources("foo.example.org", Resolv::DNS::Resource::IN::A)
}
t2 = Time.now
diff = t2 - start
assert rv.empty?, "unexpected: #{rv.inspect} (expected empty)"
assert_operator 0.3, :<=, diff
}
end
def test_no_server
u = UDPSocket.new
u.bind("127.0.0.1", 0)
_, port, _, host = u.addr
u.close
# A rase condition here.
# Another program may use the port.
# But no way to prevent it.
timeout(5) do
Resolv::DNS.open(:nameserver_port => [[host, port]]) {|dns|
assert_equal([], dns.getresources("test-no-server.example.org", Resolv::DNS::Resource::IN::A))
}
end
end
def test_invalid_byte_comment
bug9273 = '[ruby-core:59239] [Bug #9273]'
Tempfile.create('resolv_test_dns_') do |tmpfile|
tmpfile.print("\xff\x00\x40")
tmpfile.close
assert_nothing_raised(ArgumentError, bug9273) do
Resolv::DNS::Config.parse_resolv_conf(tmpfile.path)
end
end
end
def test_dots_diffences
name1 = Resolv::DNS::Name.create("example.org")
name2 = Resolv::DNS::Name.create("ex.ampl.eo.rg")
assert_not_equal(name1, name2, "different dots")
end
def test_case_insensitive_name
bug10550 = '[ruby-core:66498] [Bug #10550]'
lower = Resolv::DNS::Name.create("ruby-lang.org")
upper = Resolv::DNS::Name.create("Ruby-Lang.org")
assert_equal(lower, upper, bug10550)
end
def test_ipv6_name
addr = Resolv::IPv6.new("\0"*16)
labels = addr.to_name.to_a
expected = (['0'] * 32 + ['ip6', 'arpa']).map {|label| Resolv::DNS::Label::Str.new(label) }
assert_equal(expected, labels)
end
end
|
