/// <summary>
/// reads an entire string of format xx.yy.zz
/// </summary>
/// <returns></returns>
public string ReadDomain()
{
StringBuilder domain = new StringBuilder();
int len = 0;
while ((len = ReadByte()) != 0)
{
if ((len & 0xc0) == 0xc0)
{
SmartPointer newPointer = Copy();
newPointer.SetPosition((len & 0x3f) << 8 | ReadByte());
domain.Append(newPointer.ReadDomain());
return(domain.ToString());
}
while (len > 0)
{
domain.Append(ReadChar());
len--;
}
if (Peek() != 0)
{
domain.Append('.');
}
}
return(domain.ToString());
}
internal WKSRecord(SmartPointer pointer)
{
_address = pointer.ReadIPAddress();
_protocol = pointer.ReadByte();
throw new NotImplementedException("Haven't finished this yet");
}
internal ResourceRecord(SmartPointer pointer)
{
_domain = pointer.ReadDomain();
_dnsType = (DnsType)pointer.ReadShort();
_dnsClass = (DnsClass)pointer.ReadShort();
_ttl = pointer.ReadInt();
int recordLength = pointer.ReadShort();
switch (_dnsType)
{
case DnsType.ANAME: _record = new ANameRecord(pointer); break;
case DnsType.MX: _record = new MxRecord(pointer); break;
case DnsType.NS: _record = new NsRecord(pointer); break;
case DnsType.SOA: _record = new NsRecord(pointer); break;
case DnsType.CNAME: _record = new CNameRecord(pointer); break;
case DnsType.PTR: _record = new CNameRecord(pointer); break;
default:
pointer += recordLength;
break;
}
}
internal WKSRecord(SmartPointer pointer)
{
_address = pointer.ReadIPAddress();
_protocol = pointer.ReadByte();
throw new NotImplementedException("Haven't finished this yet");
}
internal Response(byte[] message)
{
byte flags1 = message[2];
byte flags2 = message[3];
int returnCode = flags2 & 15;
if (returnCode > 6)
{
returnCode = 6;
}
_returnCode = (ReturnCode)returnCode;
_authoritativeAnswer = ((flags1 & 4) != 0);
_recursionAvailable = ((flags2 & 128) != 0);
_truncated = ((flags1 & 2) != 0);
int _questionsCount = GetShort(message, 4);
_questions = new List <Query>();
int _answersCount = GetShort(message, 6);
_answers = new List <Answer>();
int _nameServersCount = GetShort(message, 8);
_nameServers = new List <NameServer>();
int _additionalRecordsCount = GetShort(message, 10);
_additionalRecords = new List <AdditionalRecord>();
SmartPointer pointer = new SmartPointer(message, 12);
for (int i = 0; i < _questionsCount; i++)
{
try
{
_questions.Add(new Query(pointer));
}
catch
{
throw new Exception("Invalid Response");
}
}
for (int i = 0; i < _answersCount; i++)
{
_answers.Add(new Answer(pointer));
}
for (int i = 0; i < _nameServersCount; i++)
{
_nameServers.Add(new NameServer(pointer));
}
for (int i = 0; i < _additionalRecordsCount; i++)
{
_additionalRecords.Add(new AdditionalRecord(pointer));
}
}
internal SoaRecord(SmartPointer pointer)
{
_primaryNameServer = pointer.ReadDomain();
_responsibleMailAddress = pointer.ReadDomain();
_serial = pointer.ReadInt();
_refresh = pointer.ReadInt();
_retry = pointer.ReadInt();
_expire = pointer.ReadInt();
_defaultTTL = pointer.ReadInt();
}
internal SoaRecord(SmartPointer pointer)
{
_primaryNameServer = pointer.ReadDomain();
_responsibleMailAddress = pointer.ReadDomain();
_serial = pointer.ReadInt();
_refresh = pointer.ReadInt();
_retry = pointer.ReadInt();
_expire = pointer.ReadInt();
_defaultTTL = pointer.ReadInt();
}
internal ANameRecord(SmartPointer pointer)
{
/*byte b1 = pointer.ReadByte();
* byte b2 = pointer.ReadByte();
* byte b3 = pointer.ReadByte();
* byte b4 = pointer.ReadByte();
*
* _ipAddress = IPAddress.Parse(string.Format("{0}.{1}.{2}.{3}", b1, b2, b3, b4));*/
_ipAddress = pointer.ReadIPAddress();
}
internal ANameRecord(SmartPointer pointer)
{
/*byte b1 = pointer.ReadByte();
byte b2 = pointer.ReadByte();
byte b3 = pointer.ReadByte();
byte b4 = pointer.ReadByte();
_ipAddress = IPAddress.Parse(string.Format("{0}.{1}.{2}.{3}", b1, b2, b3, b4));*/
_ipAddress = pointer.ReadIPAddress();
}
internal ResourceRecord(SmartPointer pointer)
{
_domain = pointer.ReadDomain();
_dnsType = (DnsType)pointer.ReadShort();
_dnsClass = (DnsClass)pointer.ReadShort();
_ttl = pointer.ReadInt();
int recordLength = pointer.ReadShort();
switch (_dnsType)
{
case DnsType.ANAME: _record = new ANameRecord(pointer); break;
case DnsType.MX: _record = new MxRecord(pointer); break;
case DnsType.NS: _record = new NsRecord(pointer); break;
case DnsType.SOA: _record = new NsRecord(pointer); break;
case DnsType.CNAME: _record = new CNameRecord(pointer); break;
case DnsType.PTR: _record = new CNameRecord(pointer); break;
default:
pointer += recordLength;
break;
}
}
internal Query(SmartPointer pointer)
{
_domain = pointer.ReadDomain();
_dnsType = (DnsType)pointer.ReadShort();
_dnsClass = (DnsClass)pointer.ReadShort();
}
internal MxRecord(SmartPointer pointer)
{
_preference = pointer.ReadShort();
_domainName = pointer.ReadDomain();
}
internal CNameRecord(SmartPointer pointer)
{
_domain = pointer.ReadDomain();
}
internal Response(byte[] message)
{
byte flags1 = message[2];
byte flags2 = message[3];
int returnCode = flags2 & 15;
if (returnCode > 6) returnCode = 6;
_returnCode = (ReturnCode)returnCode;
_authoritativeAnswer = ((flags1 & 4) != 0);
_recursionAvailable = ((flags2 & 128) != 0);
_truncated = ((flags1 & 2) != 0);
int _questionsCount = GetShort(message, 4);
_questions = new List<Query>();
int _answersCount = GetShort(message, 6);
_answers = new List<Answer>();
int _nameServersCount = GetShort(message, 8);
_nameServers = new List<NameServer>();
int _additionalRecordsCount = GetShort(message, 10);
_additionalRecords = new List<AdditionalRecord>();
SmartPointer pointer = new SmartPointer(message, 12);
for (int i = 0; i < _questionsCount; i++)
{
try
{
_questions.Add(new Query(pointer));
}
catch
{
throw new Exception("Invalid Response");
}
}
for (int i = 0; i < _answersCount; i++)
{
_answers.Add(new Answer(pointer));
}
for (int i = 0; i < _nameServersCount; i++)
{
_nameServers.Add(new NameServer(pointer));
}
for (int i = 0; i < _additionalRecordsCount; i++)
{
_additionalRecords.Add(new AdditionalRecord(pointer));
}
}
internal Answer(SmartPointer pointer) : base(pointer)
{
}
internal AdditionalRecord(SmartPointer pointer) : base(pointer) { }
internal CNameRecord(SmartPointer pointer)
{
_domain = pointer.ReadDomain();
}
internal Query(SmartPointer pointer)
{
_domain = pointer.ReadDomain();
_dnsType = (DnsType)pointer.ReadShort();
_dnsClass = (DnsClass)pointer.ReadShort();
}
internal RouteThroughRecord(SmartPointer pointer)
{
_preference = pointer.ReadShort();
_intermediateHost = pointer.ReadDomain();
}
internal NsRecord(SmartPointer pointer)
{
_domainName = pointer.ReadDomain();
}
internal AdditionalRecord(SmartPointer pointer) : base(pointer)
{
}
internal Answer(SmartPointer pointer) : base(pointer) { }
internal NsRecord(SmartPointer pointer)
{
_domainName = pointer.ReadDomain();
}
internal NameServer(SmartPointer pointer) : base(pointer)
{
}
internal NameServer(SmartPointer pointer) : base(pointer) { }
internal RouteThroughRecord(SmartPointer pointer)
{
_preference = pointer.ReadShort();
_intermediateHost = pointer.ReadDomain();
}
internal MxRecord(SmartPointer pointer)
{
_preference = pointer.ReadShort();
_domainName = pointer.ReadDomain();
}