summaryrefslogtreecommitdiff
path: root/jni/ruby/test/resolv/test_dns.rb
blob: d7e5c3683a814b191fecc9b5464954e37ee1d872 (plain)
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