Class: Resolv::DNS::Message

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

Overview

:nodoc:

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.



1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
 
# File 'lib/resolv.rb', line 1341

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.



1356
1357
1358
 
# File 'lib/resolv.rb', line 1356

def aa
  @aa
end

#additional ⇒ Object (readonly)

Returns the value of attribute additional.



1357
1358
1359
 
# File 'lib/resolv.rb', line 1357

def additional
  @additional
end

#answer ⇒ Object (readonly)

Returns the value of attribute answer.



1357
1358
1359
 
# File 'lib/resolv.rb', line 1357

def answer
  @answer
end

#authority ⇒ Object (readonly)

Returns the value of attribute authority.



1357
1358
1359
 
# File 'lib/resolv.rb', line 1357

def authority
  @authority
end

#id ⇒ Object

Returns the value of attribute id.



1356
1357
1358
 
# File 'lib/resolv.rb', line 1356

def id
  @id
end

#opcode ⇒ Object

Returns the value of attribute opcode.



1356
1357
1358
 
# File 'lib/resolv.rb', line 1356

def opcode
  @opcode
end

#qr ⇒ Object

Returns the value of attribute qr.



1356
1357
1358
 
# File 'lib/resolv.rb', line 1356

def qr
  @qr
end

#question ⇒ Object (readonly)

Returns the value of attribute question.



1357
1358
1359
 
# File 'lib/resolv.rb', line 1357

def question
  @question
end

#ra ⇒ Object

Returns the value of attribute ra.



1356
1357
1358
 
# File 'lib/resolv.rb', line 1356

def ra
  @ra
end

#rcode ⇒ Object

Returns the value of attribute rcode.



1356
1357
1358
 
# File 'lib/resolv.rb', line 1356

def rcode
  @rcode
end

#rd ⇒ Object

Returns the value of attribute rd.



1356
1357
1358
 
# File 'lib/resolv.rb', line 1356

def rd
  @rd
end

#tc ⇒ Object

Returns the value of attribute tc.



1356
1357
1358
 
# File 'lib/resolv.rb', line 1356

def tc
  @tc
end

Class Method Details

.decode(m) ⇒ Object 



1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
 
# File 'lib/resolv.rb', line 1515

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 



1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
 
# File 'lib/resolv.rb', line 1359

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 



1404
1405
1406
 
# File 'lib/resolv.rb', line 1404

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

#add_answer(name, ttl, data) ⇒ Object 



1384
1385
1386
 
# File 'lib/resolv.rb', line 1384

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

#add_authority(name, ttl, data) ⇒ Object 



1394
1395
1396
 
# File 'lib/resolv.rb', line 1394

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

#add_question(name, typeclass) ⇒ Object 



1374
1375
1376
 
# File 'lib/resolv.rb', line 1374

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

#each_additional ⇒ Object 



1408
1409
1410
1411
1412
 
# File 'lib/resolv.rb', line 1408

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

#each_answer ⇒ Object 



1388
1389
1390
1391
1392
 
# File 'lib/resolv.rb', line 1388

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

#each_authority ⇒ Object 



1398
1399
1400
1401
1402
 
# File 'lib/resolv.rb', line 1398

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

#each_question ⇒ Object 



1378
1379
1380
1381
1382
 
# File 'lib/resolv.rb', line 1378

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

#each_resource ⇒ Object 



1414
1415
1416
1417
1418
 
# File 'lib/resolv.rb', line 1414

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 



1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
 
# File 'lib/resolv.rb', line 1420

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