private void ReadCommonHeader(NdrBinaryReader pacStream)
{
Version = pacStream.Read(1)[0];
if (Version != NdrConstants.PROTOCOL_VERSION)
{
throw new InvalidDataException($"Unknown Protocol version {Version}");
}
var headerBits = pacStream.Read(1)[0];
var endian = headerBits >> 4 & 0x0F;
if (endian != 0 && endian != 1)
{
throw new InvalidDataException($"Unknown endianness {endian}");
}
Endian = Convert.ToBoolean(endian);
Encoding = (byte)(headerBits & 0x0F);
if (Encoding != 0 && Encoding != 1)
{
throw new InvalidDataException($"Unknown encoding {Encoding}");
}
Length = pacStream.ReadShort();
if (Length != NdrConstants.COMMON_HEADER_BYTES)
{
throw new InvalidDataException($"Unknown common header length {Length}");
}
}
private static IEnumerable <SecurityIdentifier> ParseAttributes(NdrBinaryReader Stream, int count, int pointer)
{
var attributes = new List <SecurityIdentifier>();
if (pointer == 0)
{
return(attributes);
}
int realCount = Stream.ReadInt();
if (realCount != count)
{
throw new InvalidDataException($"Expected count {count} doesn't match actual count {realCount}");
}
for (int i = 0; i < count; i++)
{
Stream.Align(4);
var sid = Stream.ReadRid();
attributes.Add(new SecurityIdentifier(sid, (SidAttributes)Stream.ReadInt()));
}
return(attributes);
}
public RpcHeader(NdrBinaryReader pacStream)
{
ReadCommonHeader(pacStream);
pacStream.Read(4);
pacStream.Read(8);
pacStream.Read(4);
}
public string ReadString(NdrBinaryReader reader)
{
if (pointer == 0)
{
return(null);
}
var result = reader.ReadString(maxLength);
var expected = length / 2;
if (result.Length != expected)
{
throw new InvalidDataException($"Read length {result.Length} doesn't match expected length {expected}");
}
return(result);
}
private static SecurityIdentifier[] ParseExtraSids(NdrBinaryReader Stream, int extraSidCount, int extraSidPointer)
{
if (extraSidPointer == 0)
{
return(new SecurityIdentifier[0]);
}
int realExtraSidCount = Stream.ReadInt();
if (realExtraSidCount != extraSidCount)
{
throw new InvalidDataException($"Expected Sid count {extraSidCount} doesn't match actual sid count {realExtraSidCount}");
}
var extraSidAtts = new SecurityIdentifier[extraSidCount];
var pointers = new int[extraSidCount];
var attributes = new SidAttributes[extraSidCount];
for (int i = 0; i < extraSidCount; i++)
{
pointers[i] = Stream.ReadInt();
attributes[i] = (SidAttributes)Stream.ReadUnsignedInt();
}
for (int i = 0; i < extraSidCount; i++)
{
SecurityIdentifier sid = null;
if (pointers[i] != 0)
{
sid = new SecurityIdentifier(Stream.ReadSid(), attributes[i]);
}
extraSidAtts[i] = sid;
}
return(extraSidAtts);
}
