/// <summary>
/// This method parses the resource record's (including its
/// length from the packet beginning at the offset passed.
/// </summary>
/// <param name="message">The message containing the record being parsed.</param>
/// <param name="packet">The packet buffer.</param>
/// <param name="offset">
/// The offset in the packet where the data will be read.
/// This parameter will return set to the offset of the first
/// byte after the parsed data.
/// </param>
/// <returns>True on success.</returns>
protected override bool ReadData(DnsMessage message, byte[] packet, ref int offset)
{
byte[] buf;
int pos;
int cb;
cb = Helper.ReadInt16(packet, ref offset);
pos = offset;
if (cb != 4)
{
return(false);
}
buf = new byte[4];
for (int i = 0; i < 4; i++)
{
buf[i] = packet[offset++];
}
ipAddr = new IPAddress(buf);
return(pos + cb == offset);
}
/// <summary>
/// This method parses the resource record's (including its
/// length from the packet beginning at the offset passed.
/// </summary>
/// <param name="message">The message containing the record being parsed.</param>
/// <param name="packet">The packet buffer.</param>
/// <param name="offset">
/// The offset in the packet where the data will be read.
/// This parameter will return set to the offset of the first
/// byte after the parsed data.
/// </param>
/// <returns>True on success.</returns>
protected override bool ReadData(DnsMessage message, byte[] packet, ref int offset)
{
Assertion.Test(false, "NAK's should never be sent in DNS messages.");
return(false);
}
/// <summary>
/// This method writes the resource record's data (including its
/// length to the packet beginning at the offset passed.
/// </summary>
/// <param name="message">The DNS message being serialized.</param>
/// <param name="packet">The packet buffer.</param>
/// <param name="offset">
/// The offset in the packet where the data will be written.
/// This parameter will return set to the offset of the first
/// byte after the written data.
/// </param>
protected override void WriteData(DnsMessage message, byte[] packet, ref int offset)
{
Assertion.Test(false, "NAK's should never be sent in DNS messages.");
}
/// <summary>
/// This method parses the resource record's (including its
/// length from the packet beginning at the offset passed.
/// </summary>
/// <param name="message">The message containing the record being parsed.</param>
/// <param name="packet">The packet buffer.</param>
/// <param name="offset">
/// The offset in the packet where the data will be read.
/// This parameter will return set to the offset of the first
/// byte after the parsed data.
/// </param>
/// <returns>True on success.</returns>
protected virtual bool ReadData(DnsMessage message, byte[] packet, ref int offset)
{
data = Helper.ReadBytes16(packet, ref offset);
return(true);
}
/// <summary>
/// This method writes the resource record's data (including its
/// length to the packet beginning at the offset passed.
/// </summary>
/// <param name="message">The DNS message being serialized.</param>
/// <param name="packet">The packet buffer.</param>
/// <param name="offset">
/// The offset in the packet where the data will be written.
/// This parameter will return set to the offset of the first
/// byte after the written data.
/// </param>
protected virtual void WriteData(DnsMessage message, byte[] packet, ref int offset)
{
Helper.WriteBytes16(packet, ref offset, data);
}
/// <summary>
/// Compares the query type and qname of this message to the one
/// passed.
/// </summary>
/// <param name="message">The message to be compared.</param>
/// <returns><c>true</c> if the query type and qnames match.</returns>
public bool Match(DnsMessage message)
{
return(this.QType == message.QType && String.Compare(this.QName, message.QName, true) == 0);
}