private byte[] ToAPayload()
{
using (var ms = new MemoryStream())
using (var writer = new BinaryWriter(ms))
{
// Write the service name
var modName = new DNS.DomainName(Name.Split('.')[0] + ".local");
var modNameBytes = modName.ToBytes();
writer.Write(modNameBytes, 0, modNameBytes.Length);
writer.Write((byte)0);
// A Record in Internet Class
writer.Write(new byte[4] {
0x00, 0x01, 0x80, 0x01
}, 0, 4);
// We need to write the TTL
byte[] ttlBytes = BitConverter.GetBytes(TTL);
byte[] newTTL = new byte[4] {
ttlBytes[3], ttlBytes[2], ttlBytes[1], ttlBytes[0]
};
writer.Write(newTTL, 0, 4);
// Write the data length
writer.Write(new byte[2] {
0x00, 0x04
}, 0, 2);
// Write the IP
writer.Write(IP.GetAddressBytes(), 0, 4);
writer.Flush();
return(ms.ToArray());
}
}
private byte[] ToSrvPayload()
{
using (var ms = new MemoryStream())
using (var writer = new BinaryWriter(ms))
{
// Write my name
var myName = new DNS.DomainName(Name);
var myNameBytes = myName.ToBytes();
writer.Write(myNameBytes, 0, myNameBytes.Length);
writer.Write((byte)0);
// Write the record type (SRV=33) and Internet class
writer.Write(new byte[4] {
0x00, 0x21, 0x80, 0x01
}, 0, 4);
// We need to write the TTL
byte[] ttlBytes = BitConverter.GetBytes(TTL);
byte[] newTTL = new byte[4] {
ttlBytes[3], ttlBytes[2], ttlBytes[1], ttlBytes[0]
};
writer.Write(newTTL, 0, 4);
var modName = new DNS.DomainName(Name.Split('.')[0] + ".local");
var modNameBytes = modName.ToBytes();
// Write the data length
short len = (short)(7 + modNameBytes.Length);
byte[] lenBytes = BitConverter.GetBytes(len);
writer.Write(new byte[2] {
lenBytes[1], lenBytes[0]
}, 0, 2);
// Write the priority
byte[] prioBytes = BitConverter.GetBytes(Priority);
writer.Write(new byte[2] {
prioBytes[1], prioBytes[0]
}, 0, 2);
// Write the Weight
byte[] weightBytes = BitConverter.GetBytes(Weight);
writer.Write(new byte[2] {
weightBytes[1], weightBytes[0]
}, 0, 2);
// Write the Port
byte[] portBytes = BitConverter.GetBytes(Port);
writer.Write(new byte[2] {
portBytes[1], portBytes[0]
}, 0, 2);
// Write the target
writer.Write(modNameBytes, 0, modNameBytes.Length);
writer.Write((byte)0);
writer.Flush();
return(ms.ToArray());
}
}
private byte[] ToTxtPayload()
{
using (var ms = new MemoryStream())
using (var writer = new BinaryWriter(ms))
{
// Write my name
var myName = new DNS.DomainName(Name);
var myNameBytes = myName.ToBytes();
writer.Write(myNameBytes, 0, myNameBytes.Length);
writer.Write((byte)0);
// Write the record type (TXT=16) and Internet class
writer.Write(new byte[4] {
0x00, 0x10, 0x80, 0x01
}, 0, 4);
// We need to write the TTL
byte[] ttlBytes = BitConverter.GetBytes(TTL);
byte[] newTTL = new byte[4] {
ttlBytes[3], ttlBytes[2], ttlBytes[1], ttlBytes[0]
};
writer.Write(newTTL, 0, 4);
// Calculate the data length
short txtLength = 0;
foreach (var pair in TxtRecords)
{
txtLength += (short)(pair.Key.Length + pair.Value.Length + 1);
}
txtLength += (short)TxtRecords.Count;
byte[] lenBytes = BitConverter.GetBytes(txtLength);
writer.Write(new byte[2] {
lenBytes[1], lenBytes[0]
}, 0, 2);
// Write the data
foreach (var pair in TxtRecords)
{
byte len = (byte)(pair.Key.Length + pair.Value.Length + 1);
writer.Write(len);
string finalVal = pair.Key + "=" + pair.Value;
byte[] finalValBytes = Encoding.ASCII.GetBytes(finalVal);
writer.Write(finalValBytes, 0, finalValBytes.Length);
}
writer.Flush();
return(ms.ToArray());
}
}
private byte[] ToPtrPayload()
{
using (var ms = new MemoryStream())
using (var writer = new BinaryWriter(ms))
{
var domName = new DNS.DomainName(Domain);
var domNameBytes = domName.ToBytes();
writer.Write(domNameBytes, 0, domNameBytes.Length);
writer.Write((byte)0);
// PTR Record in the Internet Class
writer.Write(new byte[4] {
0x00, 0x0c, 0x00, 0x01
}, 0, 4);
// We need to write the TTL
byte[] ttlBytes = BitConverter.GetBytes(TTL);
byte[] newTTL = new byte[4] {
ttlBytes[3], ttlBytes[2], ttlBytes[1], ttlBytes[0]
};
writer.Write(newTTL, 0, 4);
// Name
var myName = new DNS.DomainName(this.Name);
byte[] myNameBytes = myName.ToBytes();
short len = (short)(myNameBytes.Length + 1);
byte[] lenBytes = BitConverter.GetBytes(len);
writer.Write(new byte[2] {
lenBytes[1], lenBytes[0]
}, 0, 2);
// Write our name
writer.Write(myNameBytes, 0, myNameBytes.Length);
writer.Write((byte)0);
writer.Flush();
return(ms.ToArray());
}
}