/// <summary>
/// Writes the optional and variable length parameters to a Type-Length-Value (TLV)
/// parameter list.
/// </summary>
/// <returns>A TLV parameter list holding the optional and variable length parameters.</returns>
private List <SctpTlvChunkParameter> GetVariableParameters()
{
List <SctpTlvChunkParameter> varParams = new List <SctpTlvChunkParameter>();
// Add the optional and variable length parameters as Type-Length-Value (TLV) formatted.
foreach (var address in Addresses)
{
ushort addrParamType = (ushort)(address.AddressFamily == AddressFamily.InterNetwork ?
SctpInitChunkParameterType.IPv4Address : SctpInitChunkParameterType.IPv6Address);
var addrParam = new SctpTlvChunkParameter(addrParamType, address.GetAddressBytes());
varParams.Add(addrParam);
}
if (CookiePreservative > 0)
{
varParams.Add(
new SctpTlvChunkParameter((ushort)SctpInitChunkParameterType.CookiePreservative,
NetConvert.GetBytes(CookiePreservative)
));
}
if (!string.IsNullOrEmpty(HostnameAddress))
{
varParams.Add(
new SctpTlvChunkParameter((ushort)SctpInitChunkParameterType.HostNameAddress,
Encoding.UTF8.GetBytes(HostnameAddress)
));
}
if (SupportedAddressTypes.Count > 0)
{
byte[] paramVal = new byte[SupportedAddressTypes.Count * 2];
int paramValPosn = 0;
foreach (var supAddr in SupportedAddressTypes)
{
NetConvert.ToBuffer((ushort)supAddr, paramVal, paramValPosn);
paramValPosn += 2;
}
varParams.Add(
new SctpTlvChunkParameter((ushort)SctpInitChunkParameterType.SupportedAddressTypes, paramVal));
}
if (StateCookie != null)
{
varParams.Add(
new SctpTlvChunkParameter((ushort)SctpInitChunkParameterType.StateCookie, StateCookie));
}
foreach (var unrecognised in UnrecognizedPeerParameters)
{
varParams.Add(
new SctpTlvChunkParameter((ushort)SctpInitChunkParameterType.UnrecognizedParameter, unrecognised.GetBytes()));
}
return(varParams);
}
public STUNAttribute(STUNAttributeTypesEnum attributeType, ulong value)
{
AttributeType = attributeType;
Value = NetConvert.GetBytes(value);
}