public static DnsFlags ParseFlags(ushort flags)
{
var replyCode = (byte)(flags & 0x000f);
var nonAuthenticated = (flags & 0b1000) != 0;
var answerAuthenticated = (flags & 0b10000) != 0;
var recursionAvailable = (flags & 0b10000000) != 0;
var recursionDesired = (flags & 0b100000000) != 0;
var truncated = (flags & 0b1000000000) != 0;
var authoritative = (flags & 0b10000000000) != 0;
var opcodeByte = flags & 0b111100000000000;
var opcode = Opcode.Standard;
if (opcodeByte == 0)
{
opcode = Opcode.Standard;
}
var responce = (flags & 0b1000000000000000) != 0;
var result = new DnsFlags
{
Response = responce,
Opcode = opcode,
Authoritative = authoritative,
Truncated = truncated,
RecursionDesired = recursionDesired,
RecursionAvailable = recursionAvailable,
AdBit = false,
AnswerAuthenticated = answerAuthenticated,
NonAuthenticated = nonAuthenticated,
ReplyCode = replyCode
};
return(result);
}
public DnsTransaction(ushort _txnid, DnsFlags _flags, List <QuestionRecord> _questions, List <ResourceRecord> _answerRRs = null, List <ResourceRecord> _authorityRRs = null, List <ResourceRecord> _additionalRRs = null)
{
txnId = _txnid;
flags = _flags;
if (_questions == null)
{
throw new MalformedRecord();
}
this.queries = _questions;
if (_answerRRs == null)
{
_answerRRs = new List <ResourceRecord>(0);
}
this.answerRecords = _answerRRs;
if (_authorityRRs == null)
{
_authorityRRs = new List <ResourceRecord>(0);
}
this.authorityRecords = _authorityRRs;
if (_additionalRRs == null)
{
_additionalRRs = new List <ResourceRecord>(0);
}
this.additionalRecords = _additionalRRs;
}
public static ushort CreateFlags(DnsFlags flags)
{
var response = BoolToBit(flags.Response);
var opcode = (byte)flags.Opcode;
var authoritative = BoolToBit(flags.Authoritative);
var truncated = BoolToBit(flags.Truncated);
var recursionDesired = BoolToBit(flags.RecursionDesired);
var recursionAvailable = BoolToBit(flags.RecursionAvailable);
var answerAuthenticated = BoolToBit(flags.AnswerAuthenticated);
var nonAuthenticated = BoolToBit(flags.NonAuthenticated);
var replyCode = flags.ReplyCode;
var value = (response << 15) | ((opcode & 0b1111) << 11) | (authoritative << 10) | (truncated << 9) |
(recursionDesired << 8) | (recursionAvailable << 7) | (answerAuthenticated << 5) |
(nonAuthenticated << 4) | replyCode;
return((ushort)value);
}
public DnsTransaction(byte[] bytes)
{
ushort offset = 0;
ushort qc;
ushort ansc;
ushort authc;
ushort addc;
this.txnId = GetLEUInt16(bytes, ref offset);
this.flags = new DnsFlags(GetLEUInt16(bytes, ref offset));
qc = GetLEUInt16(bytes, ref offset);
this.queries = new List <QuestionRecord>(qc);
ansc = GetLEUInt16(bytes, ref offset);
this.answerRecords = new List <ResourceRecord>(ansc);
authc = GetLEUInt16(bytes, ref offset);
this.authorityRecords = new List <ResourceRecord>(authc);
addc = GetLEUInt16(bytes, ref offset);
this.additionalRecords = new List <ResourceRecord>(addc);
for (int n = 0; n < qc; n++)
{
this.queries.Add(new QuestionRecord(bytes, ref offset));
}
for (int n = 0; n < ansc; n++)
{
this.answerRecords.Add(new ResourceRecord(bytes, ref offset));
}
for (int n = 0; n < authc; n++)
{
this.authorityRecords.Add(new ResourceRecord(bytes, ref offset));
}
for (int n = 0; n < addc; n++)
{
this.additionalRecords.Add(new ResourceRecord(bytes, ref offset));
}
}
public DnsTransaction(ushort _txnid, DnsFlags _flags, QuestionRecord _question)
: this(_txnid, _flags, oneItemList <QuestionRecord>(_question))
{
}
