private DnsQueryRequest ParseQuery(ref MemoryStream ms)
{
DnsQueryRequest queryRequest = new DnsQueryRequest();
// Read name
queryRequest.Name = DnsRecordBase.ParseName(ref ms);
return(queryRequest);
}
private DnsQueryRequest ParseQuery(ref MemoryStream ms)
{
DnsQueryRequest queryRequest = new DnsQueryRequest();
// Read name
queryRequest.Name = DnsRecordBase.ParseName(ref ms);
return queryRequest;
}
internal void ParseResponse(byte[] recvBytes)
{
MemoryStream ms = new MemoryStream(recvBytes);
byte[] flagBytes = new byte[2];
byte[] transactionId = new byte[2];
byte[] questions = new byte[2];
byte[] answerRRs = new byte[2];
byte[] authorityRRs = new byte[2];
byte[] additionalRRs = new byte[2];
byte[] nsType = new byte[2];
byte[] nsClass = new byte[2];
this._bytesReceived = recvBytes.Length;
// Parse DNS Response
ms.Read(transactionId, 0, 2);
ms.Read(flagBytes, 0, 2);
ms.Read(questions, 0, 2);
ms.Read(answerRRs, 0, 2);
ms.Read(authorityRRs, 0, 2);
ms.Read(additionalRRs ,0, 2);
// Parse Header
_transactionId = (ushort)IPAddress.NetworkToHostOrder((short)BitConverter.ToUInt16(transactionId, 0));
_flags = (ushort)IPAddress.NetworkToHostOrder((short)BitConverter.ToUInt16(flagBytes, 0));
_queryResponse = (QueryResponse)(_flags & (ushort)FlagMasks.QueryResponseMask);
_opCode = (OpCode)(_flags & (ushort)FlagMasks.OpCodeMask);
_nsFlags = (NsFlags)(_flags & (ushort)FlagMasks.NsFlagMask);
_rCode = (RCode)(_flags & (ushort)FlagMasks.RCodeMask);
// Parse Questions Section
_questions = (ushort)IPAddress.NetworkToHostOrder((short)BitConverter.ToUInt16(questions, 0));
_answerRRs = (ushort)IPAddress.NetworkToHostOrder(BitConverter.ToInt16(answerRRs, 0));
_authorityRRs = (ushort)IPAddress.NetworkToHostOrder(BitConverter.ToInt16(authorityRRs, 0));
_additionalRRs = (ushort)IPAddress.NetworkToHostOrder(BitConverter.ToInt16(additionalRRs, 0));
_additionalRecords = new DnsRecordBase[_additionalRRs];
_answers = new DnsRecordBase[_answerRRs];
_authoritiveNameServers = new DnsRecordBase[_authorityRRs];
// Parse Queries
_queryRequest = this.ParseQuery(ref ms);
// Read dnsType
ms.Read(nsType, 0, 2);
// Read dnsClass
ms.Read(nsClass, 0, 2);
_nsType = (NsType)IPAddress.NetworkToHostOrder(BitConverter.ToInt16(nsType, 0));
_nsClass = (NsClass)IPAddress.NetworkToHostOrder(BitConverter.ToInt16(nsClass, 0));
// Read in Answer Blocks
for (int i=0; i < _answerRRs; i++)
{
_answers[i] = RecordFactory.Create(ref ms);
}
// Parse Authority Records
for (int i=0; i < _authorityRRs; i++)
{
_authoritiveNameServers[i] = RecordFactory.Create(ref ms);
}
// Parse Additional Records
for (int i=0; i < _additionalRRs; i++)
{
_additionalRecords[i] = RecordFactory.Create(ref ms);
}
}
private void btnLookup_Click(object sender, EventArgs e)
{
NsType lookupType = (NsType)((FieldInfo)lstBxQueryType.SelectedValue).GetValue(null);
DnsQueryRequest request = new DnsQueryRequest();
DnsQueryResponse response = request.Resolve(txtDnsServer.Text, txtNameToLookup.Text, lookupType, NsClass.INET, ProtocolType.Udp);
StringBuilder sb = new StringBuilder(1024);
sb.Append("Bytes received: " + response.BytesReceived);
sb.Append("\r\n");
// Enumerate the Authoritive Name Servers Records
sb.Append("Authoritive Name Servers:");
sb.Append("\r\n");
foreach (IDnsRecord record in response.AuthoritiveNameServers)
{
sb.Append(record.Answer);
sb.Append("\r\n");
sb.Append(" |--- RDATA Field Length: ");
sb.Append(record.DnsHeader.DataLength);
sb.Append("\r\n");
sb.Append(" |--- Name: ");
sb.Append(record.DnsHeader.Name);
sb.Append("\r\n");
sb.Append(" |--- NS Class: ");
sb.Append(record.DnsHeader.NsClass);
sb.Append("\r\n");
sb.Append(" |--- NS Type: ");
sb.Append(record.DnsHeader.NsType);
sb.Append("\r\n");
sb.Append(" |--- TTL: ");
sb.Append(record.DnsHeader.TimeToLive);
sb.Append("\r\n");
}
// Enumerate the Answer Records
sb.Append("Answers:");
sb.Append("\r\n");
foreach (IDnsRecord record in response.Answers)
{
sb.Append(record.Answer);
sb.Append("\r\n");
sb.Append(" |--- RDATA Field Length: ");
sb.Append(record.DnsHeader.DataLength);
sb.Append("\r\n");
sb.Append(" |--- Name: ");
sb.Append(record.DnsHeader.Name);
sb.Append("\r\n");
sb.Append(" |--- NS Class: ");
sb.Append(record.DnsHeader.NsClass);
sb.Append("\r\n");
sb.Append(" |--- NS Type: ");
sb.Append(record.DnsHeader.NsType);
sb.Append("\r\n");
sb.Append(" |--- TTL: ");
sb.Append(record.DnsHeader.TimeToLive);
sb.Append("\r\n");
}
sb.Append("Additional Records");
sb.Append("\r\n");
foreach (IDnsRecord record in response.AdditionalRecords)
{
sb.Append(record.Answer);
sb.Append("\r\n");
sb.Append(" |--- RDATA Field Length: ");
sb.Append(record.DnsHeader.DataLength);
sb.Append("\r\n");
sb.Append(" |--- Name: ");
sb.Append(record.DnsHeader.Name);
sb.Append("\r\n");
sb.Append(" |--- NS Class: ");
sb.Append(record.DnsHeader.NsClass);
sb.Append("\r\n");
sb.Append(" |--- NS Type: ");
sb.Append(record.DnsHeader.NsType);
sb.Append("\r\n");
sb.Append(" |--- TTL: ");
sb.Append(record.DnsHeader.TimeToLive);
sb.Append("\r\n");
}
txtOutput.Text = sb.ToString();
}
internal void ParseResponse(byte[] recvBytes)
{
MemoryStream ms = new MemoryStream(recvBytes);
byte[] flagBytes = new byte[2];
byte[] transactionId = new byte[2];
byte[] questions = new byte[2];
byte[] answerRRs = new byte[2];
byte[] authorityRRs = new byte[2];
byte[] additionalRRs = new byte[2];
byte[] nsType = new byte[2];
byte[] nsClass = new byte[2];
this._bytesReceived = recvBytes.Length;
// Parse DNS Response
ms.Read(transactionId, 0, 2);
ms.Read(flagBytes, 0, 2);
ms.Read(questions, 0, 2);
ms.Read(answerRRs, 0, 2);
ms.Read(authorityRRs, 0, 2);
ms.Read(additionalRRs, 0, 2);
// Parse Header
_transactionId = (ushort)IPAddress.NetworkToHostOrder((short)BitConverter.ToUInt16(transactionId, 0));
_flags = (ushort)IPAddress.NetworkToHostOrder((short)BitConverter.ToUInt16(flagBytes, 0));
_queryResponse = (QueryResponse)(_flags & (ushort)FlagMasks.QueryResponseMask);
_opCode = (OpCode)(_flags & (ushort)FlagMasks.OpCodeMask);
_nsFlags = (NsFlags)(_flags & (ushort)FlagMasks.NsFlagMask);
_rCode = (RCode)(_flags & (ushort)FlagMasks.RCodeMask);
// Parse Questions Section
_questions = (ushort)IPAddress.NetworkToHostOrder((short)BitConverter.ToUInt16(questions, 0));
_answerRRs = (ushort)IPAddress.NetworkToHostOrder(BitConverter.ToInt16(answerRRs, 0));
_authorityRRs = (ushort)IPAddress.NetworkToHostOrder(BitConverter.ToInt16(authorityRRs, 0));
_additionalRRs = (ushort)IPAddress.NetworkToHostOrder(BitConverter.ToInt16(additionalRRs, 0));
_additionalRecords = new DnsRecordBase[_additionalRRs];
_answers = new DnsRecordBase[_answerRRs];
_authoritiveNameServers = new DnsRecordBase[_authorityRRs];
// Parse Queries
_queryRequest = this.ParseQuery(ref ms);
// Read dnsType
ms.Read(nsType, 0, 2);
// Read dnsClass
ms.Read(nsClass, 0, 2);
_nsType = (NsType)IPAddress.NetworkToHostOrder(BitConverter.ToInt16(nsType, 0));
_nsClass = (NsClass)IPAddress.NetworkToHostOrder(BitConverter.ToInt16(nsClass, 0));
// Read in Answer Blocks
for (int i = 0; i < _answerRRs; i++)
{
_answers[i] = RecordFactory.Create(ref ms);
}
// Parse Authority Records
for (int i = 0; i < _authorityRRs; i++)
{
_authoritiveNameServers[i] = RecordFactory.Create(ref ms);
}
// Parse Additional Records
for (int i = 0; i < _additionalRRs; i++)
{
_additionalRecords[i] = RecordFactory.Create(ref ms);
}
}
