private void ParseDatagramNBTNames(IPEndPoint from, byte[] data)
{
NetBIOSUdpHeader netBIOSHeader = NetBIOSUdpHeader.FromRequest(data);
// TODO : Check name encoding and assert the ExtractString is inline
// with it.
string domain = NetBIOSHelpers.DecodeName(
data.ExtractString(49, NetBIOSHelpers.NetbiosNameLength));
string name = NetBIOSHelpers.DecodeName(
data.ExtractString(15, NetBIOSHelpers.NetbiosNameLength));
string role1 = NetBIOSHelpers.GetRoleById(
data.ExtractData(45, NetBIOSHelpers.NetbiosRoleIdLength));
string role2 = NetBIOSHelpers.GetRoleById(
data.ExtractData(79, NetBIOSHelpers.NetbiosRoleIdLength));
if (_analyze)
{
switch (role2)
{
case "Domain Controller":
case "Browser Election":
case "Local Master Browser":
Console.WriteLine(
"[Analyze mode: Browser] Datagram Request from IP: {0} hostname: {1} via the: {2} to: {3}. Service: {4}",
from, name, role1, domain, role2);
RAPThisDomain(from, domain);
break;
default:
break;
}
}
}
private void BecomeBackup(IPEndPoint from, byte[] data)
{
try {
int dataOffset = data.ToUInt16(Endianness.LittleEndian, 139);
byte[] browserPacket = data.ExtractData(82 + dataOffset);
string reqType = DecodeRequestType(browserPacket[0]);
if (reqType != "Become Backup Browser")
{
return;
}
string serverName = Encoding.ASCII.GetString(browserPacket.ExtractData(1));
string domain = NetBIOSHelpers.DecodeName(
data.ExtractString(49, NetBIOSHelpers.NetbiosNameLength));
string name = NetBIOSHelpers.DecodeName(
data.ExtractString(15, NetBIOSHelpers.NetbiosNameLength));
string role = NetBIOSHelpers.GetRoleById(
data.ExtractData(45, NetBIOSHelpers.NetbiosRoleIdLength));
if (_analyze)
{
Console.WriteLine("[Analyze mode: Browser] Datagram Request from IP: {0} hostname: {1} via the: {2} wants to become a Local Master Browser Backup on this domain: {3}.",
from, name, role, domain);
RAPThisDomain(from, domain);
}
}
catch (Exception e) { return; }
}