private byte[] BuildDnsRequest(string host, NsType queryType, NsClass queryClass, ProtocolType protocol, IMessageSecurityProvider messageSecurityProvider)
{
// Combind the NsFlags with our constant flags
ushort flags = (ushort)((ushort)_queryResponse | (ushort)_opCode | (ushort)_nsFlags);
this._flags = flags;
//NOTE: This limits the librarys ablity to issue multiple queries per request.
this._nsType = queryType;
this._nsClass = queryClass;
this._name = host;
if (messageSecurityProvider != null)
{
messageSecurityProvider.SecureMessage(this);
}
byte[] bDnsQuery = GetMessageBytes();
// Add two byte prefix that contains the packet length per RFC 1035 section 4.2.2
if (protocol == ProtocolType.Tcp)
{
// 4.2.2. TCP usageMessages sent over TCP connections use server port 53 (decimal).
// The message is prefixed with a two byte length field which gives the message
// length, excluding the two byte length field. This length field allows the
// low-level processing to assemble a complete message before beginning to parse
// it.
int len = bDnsQuery.Length;
Array.Resize <byte>(ref bDnsQuery, len + 2);
Array.Copy(bDnsQuery, 0, bDnsQuery, 2, len);
bDnsQuery[0] = (byte)((len >> 8) & 0xFF);
bDnsQuery[1] = (byte)((len & 0xFF));
}
return(bDnsQuery);
}
private byte[] BuildDnsRequest(string host, NsType queryType, NsClass queryClass, ProtocolType protocol, IMessageSecurityProvider messageSecurityProvider)
{
// Combind the NsFlags with our constant flags
ushort flags = (ushort)((ushort)_queryResponse | (ushort)_opCode | (ushort)_nsFlags);
this._flags = flags;
//NOTE: This limits the librarys ablity to issue multiple queries per request.
this._nsType = queryType;
this._nsClass = queryClass;
this._name = host;
if(messageSecurityProvider != null)
{
messageSecurityProvider.SecureMessage(this);
}
byte[] bDnsQuery = GetMessageBytes();
// Add two byte prefix that contains the packet length per RFC 1035 section 4.2.2
if (protocol == ProtocolType.Tcp)
{
// 4.2.2. TCP usageMessages sent over TCP connections use server port 53 (decimal).
// The message is prefixed with a two byte length field which gives the message
// length, excluding the two byte length field. This length field allows the
// low-level processing to assemble a complete message before beginning to parse
// it.
int len = bDnsQuery.Length;
Array.Resize<byte>(ref bDnsQuery, len + 2);
Array.Copy(bDnsQuery, 0, bDnsQuery, 2, len);
bDnsQuery[0] = (byte)((len >> 8) & 0xFF);
bDnsQuery[1] = (byte)((len & 0xFF));
}
return bDnsQuery;
}
