/// <summary>
/// Take care of a packet of Multicast DNS stuff
/// </summary>
/// <param name="payload"></param>
internal static void HandlePacket(byte[] payload)
{
ushort ipHeaderLength = (ushort)((payload[14] & 0x0f) * 4);
var name = DNS.DecodeDnsName(payload, 34 + ipHeaderLength); // Name from first Query
if (Adapter.VerboseDebugging)
{
Debug.WriteLine("Local Name Request (MDNS) for " + name);
}
bool isQuery = (payload[24 + ipHeaderLength] & (1 << 7)) == 0; // DNS Query ?
if (!isQuery)
{
return;
}
// Validate that this is MDNS address 224.0.0.251
if (payload[10 + ipHeaderLength] != 0xe0 || payload[11 + ipHeaderLength] != 0x00 || payload[12 + ipHeaderLength] != 0x00 || payload[13 + ipHeaderLength] != 0xfb)
{
return;
}
if (name != Networking.Adapter.Name + ".local")
{
return; // if the name requested does not match ours, exit!
}
// Wow, if we made it past all that, we should send a reply...
SendMDNSNameReply();
}
/// <summary>
/// Take care of a packet of Linked-Local Multicast Name Resolution (LLMNR) stuff
/// </summary>
/// <param name="payload"></param>
internal static void HandlePacket(byte[] payload)
{
ushort ipHeaderLength = (ushort)((payload[14] & 0x0f) * 4);
var name = DNS.DecodeDnsName(payload, 34 + ipHeaderLength); // Name from first Query
bool isQuery = (payload[24 + ipHeaderLength] & (1 << 7)) == 0; // DNS Query ?
if (!isQuery)
{
return;
}
// This is not a good or valid way to detect the type because there could be multiple answers, but I have bigger fish to fry...
bool isTypeA = payload[payload.Length - 3] == 0x01;
if (!isTypeA)
{
return;
}
// Validate that this is an LLMNR address 224.0.0.252
if (payload[10 + ipHeaderLength] != 0xe0 || payload[11 + ipHeaderLength] != 0x00 || payload[12 + ipHeaderLength] != 0x00 || payload[13 + ipHeaderLength] != 0xfc)
{
return;
}
//Debug.WriteLine("Local Name Request (LLMNR, Type A) for " + name);
if (name != Networking.Adapter.Name + ".local" && name != Networking.Adapter.Name)
{
return; // if the name requested does not match ours, exit!
}
if (Adapter.VerboseDebugging)
{
Debug.WriteLine("Local Name Request (LLMNR, Type A) for " + name);
}
SendLLMNRNameReply(name, Utility.ExtractRangeFromArray(payload, 42, 2), Utility.ExtractRangeFromArray(payload, 6, 6), Utility.ExtractRangeFromArray(payload, 26, 4), Utility.ExtractRangeFromArray(payload, 34, 2));
}