public DnsHeader(Stream s)
{
_ID = DnsDatagram.ReadUInt16NetworkOrder(s);
int lB = s.ReadByte();
_QR = Convert.ToByte((lB & 0x80) >> 7);
_OPCODE = (DnsOpcode)Convert.ToByte((lB & 0x78) >> 3);
_AA = Convert.ToByte((lB & 0x4) >> 2);
_TC = Convert.ToByte((lB & 0x2) >> 1);
_RD = Convert.ToByte(lB & 0x1);
int rB = s.ReadByte();
_RA = Convert.ToByte((rB & 0x80) >> 7);
_Z = Convert.ToByte((rB & 0x40) >> 6);
_AD = Convert.ToByte((rB & 0x20) >> 5);
_CD = Convert.ToByte((rB & 0x10) >> 4);
_RCODE = (DnsResponseCode)(rB & 0xf);
_QDCOUNT = DnsDatagram.ReadUInt16NetworkOrder(s);
_ANCOUNT = DnsDatagram.ReadUInt16NetworkOrder(s);
_NSCOUNT = DnsDatagram.ReadUInt16NetworkOrder(s);
_ARCOUNT = DnsDatagram.ReadUInt16NetworkOrder(s);
}
public DnsPacket(byte[] buffer)
{
int index = 0;
Identification = DnsUtil.ToUInt16(buffer, ref index);
QueryResponse = (buffer[index] & (1 << 7)) != 0;
Opcode = (DnsOpcode)((buffer[index] >> 3) & 0b1111);
AuthoritativeAnswer = (buffer[index] & (1 << 2)) != 0;
Truncated = (buffer[index] & (1 << 1)) != 0;
RecursionDesired = (buffer[index++] & 1) != 0;
RecursionAvailable = (buffer[index] & (1 << 7)) != 0;
AuthenticatedData = (buffer[index] & (1 << 5)) != 0;
CheckingDisabled = (buffer[index] & (1 << 4)) != 0;
ReturnCode = (DnsReturnCode)(buffer[index++] & 0b1111);
TotalQuestions = DnsUtil.ToUInt16(buffer, ref index);
TotalAnswers = DnsUtil.ToUInt16(buffer, ref index);
TotalAuthorities = DnsUtil.ToUInt16(buffer, ref index);
TotalAdditionalResources = DnsUtil.ToUInt16(buffer, ref index);
for (int i = 0; i < TotalQuestions; ++i)
{
Questions[i] = new DnsQuestion(buffer, ref index);
}
for (int i = 0; i < TotalAnswers; ++i)
{
Answers[i] = new DnsResourceRecord(buffer, ref index);
}
for (int i = 0; i < TotalAuthorities; ++i)
{
Authorities[i] = new DnsResourceRecord(buffer, ref index);
}
for (int i = 0; i < TotalAdditionalResources; ++i)
{
AdditionalResources[i] = new DnsResourceRecord(buffer, ref index);
}
}
public DnsHeader(dynamic jsonResponse)
{
_QR = 1; //is response
_OPCODE = DnsOpcode.StandardQuery;
_TC = (byte)(jsonResponse.TC.Value ? 1 : 0);
_RD = (byte)(jsonResponse.RD.Value ? 1 : 0);
_RA = (byte)(jsonResponse.RA.Value ? 1 : 0);
_AD = (byte)(jsonResponse.AD.Value ? 1 : 0);
_CD = (byte)(jsonResponse.CD.Value ? 1 : 0);
_RCODE = (DnsResponseCode)jsonResponse.Status;
_QDCOUNT = Convert.ToUInt16(jsonResponse.Question.Count);
if (jsonResponse.Answer != null)
{
_ANCOUNT = Convert.ToUInt16(jsonResponse.Answer.Count);
}
if (jsonResponse.Authority != null)
{
_NSCOUNT = Convert.ToUInt16(jsonResponse.Authority.Count);
}
if (jsonResponse.Additional != null)
{
_ARCOUNT = Convert.ToUInt16(jsonResponse.Additional.Count);
}
}
public DnsHeader(ushort ID, bool isResponse, DnsOpcode OPCODE, bool authoritativeAnswer, bool truncation, bool recursionDesired, bool recursionAvailable, bool authenticData, bool checkingDisabled, DnsResponseCode RCODE, ushort QDCOUNT, ushort ANCOUNT, ushort NSCOUNT, ushort ARCOUNT)
{
_ID = ID;
if (_ID == 0)
{
byte[] buffer = new byte[2];
DnsClient._rnd.GetBytes(buffer);
_ID = BitConverter.ToUInt16(buffer, 0);
}
if (isResponse)
{
_QR = 1;
}
_OPCODE = OPCODE;
if (authoritativeAnswer)
{
_AA = 1;
}
if (truncation)
{
_TC = 1;
}
if (recursionDesired)
{
_RD = 1;
}
if (recursionAvailable)
{
_RA = 1;
}
if (authenticData)
{
_AD = 1;
}
if (checkingDisabled)
{
_CD = 1;
}
_RCODE = RCODE;
_QDCOUNT = QDCOUNT;
_ANCOUNT = ANCOUNT;
_NSCOUNT = NSCOUNT;
_ARCOUNT = ARCOUNT;
}
public DnsHeader(ushort ID, bool isResponse, DnsOpcode OPCODE, bool authoritativeAnswer, bool truncation, bool recursionDesired, bool recursionAvailable, bool authenticData, bool checkingDisabled, DnsResponseCode RCODE, ushort QDCOUNT, ushort ANCOUNT, ushort NSCOUNT, ushort ARCOUNT)
{
_ID = ID;
if (isResponse)
{
_QR = 1;
}
_OPCODE = OPCODE;
if (authoritativeAnswer)
{
_AA = 1;
}
if (truncation)
{
_TC = 1;
}
if (recursionDesired)
{
_RD = 1;
}
if (recursionAvailable)
{
_RA = 1;
}
if (authenticData)
{
_AD = 1;
}
if (checkingDisabled)
{
_CD = 1;
}
_RCODE = RCODE;
_QDCOUNT = QDCOUNT;
_ANCOUNT = ANCOUNT;
_NSCOUNT = NSCOUNT;
_ARCOUNT = ARCOUNT;
}
public DnsDatagram(ushort ID, bool isResponse, DnsOpcode OPCODE, bool authoritativeAnswer, bool truncation, bool recursionDesired, bool recursionAvailable, bool authenticData, bool checkingDisabled, DnsResponseCode RCODE, IReadOnlyList <DnsQuestionRecord> question, IReadOnlyList <DnsResourceRecord> answer = null, IReadOnlyList <DnsResourceRecord> authority = null, IReadOnlyList <DnsResourceRecord> additional = null)
{
_ID = ID;
if (isResponse)
{
_QR = 1;
}
_OPCODE = OPCODE;
if (authoritativeAnswer)
{
_AA = 1;
}
if (truncation)
{
_TC = 1;
}
if (recursionDesired)
{
_RD = 1;
}
if (recursionAvailable)
{
_RA = 1;
}
if (authenticData)
{
_AD = 1;
}
if (checkingDisabled)
{
_CD = 1;
}
_RCODE = RCODE;
_question = question;
_answer = answer;
_authority = authority;
_additional = additional;
if (_answer == null)
{
_answer = Array.Empty <DnsResourceRecord>();
}
if (_authority == null)
{
_authority = Array.Empty <DnsResourceRecord>();
}
if (_additional == null)
{
_additional = Array.Empty <DnsResourceRecord>();
}
}