Class: Resolv::DNS::Message

Inherits:
Object
  • Object
show all
Defined in:
lib/logmerge/resolv.rb

Defined Under Namespace

Classes: MessageDecoder, MessageEncoder

Constant Summary collapse

@@identifier = 
-1

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(id = (@@identifier += 1) & 0xffff) ⇒ Message

Returns a new instance of Message.



1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
 
# File 'lib/logmerge/resolv.rb', line 1049

def initialize(id = (@@identifier += 1) & 0xffff)
  @id = id
  @qr = 0
  @opcode = 0
  @aa = 0
  @tc = 0
  @rd = 0 # recursion desired
  @ra = 0 # recursion available
  @rcode = 0
  @question = []
  @answer = []
  @authority = []
  @additional = []
end

Instance Attribute Details

#aa ⇒ Object

Returns the value of attribute aa.



1064
1065
1066
 
# File 'lib/logmerge/resolv.rb', line 1064

def aa
  @aa
end

#additional ⇒ Object (readonly)

Returns the value of attribute additional.



1065
1066
1067
 
# File 'lib/logmerge/resolv.rb', line 1065

def additional
  @additional
end

#answer ⇒ Object (readonly)

Returns the value of attribute answer.



1065
1066
1067
 
# File 'lib/logmerge/resolv.rb', line 1065

def answer
  @answer
end

#authority ⇒ Object (readonly)

Returns the value of attribute authority.



1065
1066
1067
 
# File 'lib/logmerge/resolv.rb', line 1065

def authority
  @authority
end

#id ⇒ Object

Returns the value of attribute id.



1064
1065
1066
 
# File 'lib/logmerge/resolv.rb', line 1064

def id
  @id
end

#opcode ⇒ Object

Returns the value of attribute opcode.



1064
1065
1066
 
# File 'lib/logmerge/resolv.rb', line 1064

def opcode
  @opcode
end

#qr ⇒ Object

Returns the value of attribute qr.



1064
1065
1066
 
# File 'lib/logmerge/resolv.rb', line 1064

def qr
  @qr
end

#question ⇒ Object (readonly)

Returns the value of attribute question.



1065
1066
1067
 
# File 'lib/logmerge/resolv.rb', line 1065

def question
  @question
end

#ra ⇒ Object

Returns the value of attribute ra.



1064
1065
1066
 
# File 'lib/logmerge/resolv.rb', line 1064

def ra
  @ra
end

#rcode ⇒ Object

Returns the value of attribute rcode.



1064
1065
1066
 
# File 'lib/logmerge/resolv.rb', line 1064

def rcode
  @rcode
end

#rd ⇒ Object

Returns the value of attribute rd.



1064
1065
1066
 
# File 'lib/logmerge/resolv.rb', line 1064

def rd
  @rd
end

#tc ⇒ Object

Returns the value of attribute tc.



1064
1065
1066
 
# File 'lib/logmerge/resolv.rb', line 1064

def tc
  @tc
end

Class Method Details

.decode(m) ⇒ Object 



1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
 
# File 'lib/logmerge/resolv.rb', line 1221

def Message.decode(m)
  o = Message.new(0)
  MessageDecoder.new(m) {|msg|
    id, flag, qdcount, ancount, nscount, arcount =
      msg.get_unpack('nnnnnn')
    o.id = id
    o.qr = (flag >> 15) & 1
    o.opcode = (flag >> 11) & 15
    o.aa = (flag >> 10) & 1
    o.tc = (flag >> 9) & 1
    o.rd = (flag >> 8) & 1
    o.ra = (flag >> 7) & 1
    o.rcode = flag & 15
    (1..qdcount).each {
      name, typeclass = msg.get_question
      o.add_question(name, typeclass)
    }
    (1..ancount).each {
      name, ttl, data = msg.get_rr
      o.add_answer(name, ttl, data)
    }
    (1..nscount).each {
      name, ttl, data = msg.get_rr
      o.add_authority(name, ttl, data)
    }
    (1..arcount).each {
      name, ttl, data = msg.get_rr
      o.add_additional(name, ttl, data)
    }
  }
  return o
end

Instance Method Details

#==(other) ⇒ Object 



1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
 
# File 'lib/logmerge/resolv.rb', line 1067

def ==(other)
  return @id == other.id &&
         @qr == other.qr &&
         @opcode == other.opcode &&
         @aa == other.aa &&
         @tc == other.tc &&
         @rd == other.rd &&
         @ra == other.ra &&
         @rcode == other.rcode &&
         @question == other.question &&
         @answer == other.answer &&
         @authority == other.authority &&
         @additional == other.additional
end

#add_additional(name, ttl, data) ⇒ Object 



1112
1113
1114
 
# File 'lib/logmerge/resolv.rb', line 1112

def add_additional(name, ttl, data)
  @additional << [Name.create(name), ttl, data]
end

#add_answer(name, ttl, data) ⇒ Object 



1092
1093
1094
 
# File 'lib/logmerge/resolv.rb', line 1092

def add_answer(name, ttl, data)
  @answer << [Name.create(name), ttl, data]
end

#add_authority(name, ttl, data) ⇒ Object 



1102
1103
1104
 
# File 'lib/logmerge/resolv.rb', line 1102

def add_authority(name, ttl, data)
  @authority << [Name.create(name), ttl, data]
end

#add_question(name, typeclass) ⇒ Object 



1082
1083
1084
 
# File 'lib/logmerge/resolv.rb', line 1082

def add_question(name, typeclass)
  @question << [Name.create(name), typeclass]
end

#each_additional ⇒ Object 



1116
1117
1118
1119
1120
 
# File 'lib/logmerge/resolv.rb', line 1116

def each_additional
  @additional.each {|name, ttl, data|
    yield name, ttl, data
  }
end

#each_answer ⇒ Object 



1096
1097
1098
1099
1100
 
# File 'lib/logmerge/resolv.rb', line 1096

def each_answer
  @answer.each {|name, ttl, data|
    yield name, ttl, data
  }
end

#each_authority ⇒ Object 



1106
1107
1108
1109
1110
 
# File 'lib/logmerge/resolv.rb', line 1106

def each_authority
  @authority.each {|name, ttl, data|
    yield name, ttl, data
  }
end

#each_question ⇒ Object 



1086
1087
1088
1089
1090
 
# File 'lib/logmerge/resolv.rb', line 1086

def each_question
  @question.each {|name, typeclass|
    yield name, typeclass
  }
end

#each_resource ⇒ Object 



1122
1123
1124
1125
1126
 
# File 'lib/logmerge/resolv.rb', line 1122

def each_resource
  each_answer {|name, ttl, data| yield name, ttl, data}
  each_authority {|name, ttl, data| yield name, ttl, data}
  each_additional {|name, ttl, data| yield name, ttl, data}
end

#encode ⇒ Object 



1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
 
# File 'lib/logmerge/resolv.rb', line 1128

def encode
  return MessageEncoder.new {|msg|
    msg.put_pack('nnnnnn',
      @id,
      (@qr & 1) << 15 |
      (@opcode & 15) << 11 |
      (@aa & 1) << 10 |
      (@tc & 1) << 9 |
      (@rd & 1) << 8 |
      (@ra & 1) << 7 |
      (@rcode & 15),
      @question.length,
      @answer.length,
      @authority.length,
      @additional.length)
    @question.each {|q|
      name, typeclass = q
      msg.put_name(name)
      msg.put_pack('nn', typeclass::TypeValue, typeclass::ClassValue)
    }
    [@answer, @authority, @additional].each {|rr|
      rr.each {|r|
        name, ttl, data = r
        msg.put_name(name)
        msg.put_pack('nnN', data.class::TypeValue, data.class::ClassValue, ttl)
        msg.put_length16 {data.encode_rdata(msg)}
      }
    }
  }.to_s
end