internal void GetIndirectHandleAttribute(AlpcHandleMessageAttribute attribute, NtAlpc port, AlpcMessage message)
{
// Indirect handle attributes need to be queried from the port.
var attr = GetAttribute <AlpcHandleAttrIndirect>(AlpcMessageAttributeFlags.Handle).Result;
attribute.SetHandles(Enumerable.Range(0, attr.HandleCount).Select(i => port.GetHandleInformation(message, i)));
}
internal void SetHandleAttribute(AlpcHandleMessageAttribute attribute)
{
// If no handle attributes then just zero the buffer.
if (!attribute.Handles.Any())
{
var attr = GetAttribute <AlpcHandleAttr>(AlpcMessageAttributeFlags.Handle);
attr.Result = new AlpcHandleAttr()
{
Flags = 0,
ObjectType = 0,
Handle = IntPtr.Zero,
DesiredAccess = 0
};
return;
}
int count = attribute.Handles.Count();
if (count > 1)
{
var attr = GetAttribute <AlpcHandleAttrIndirect>(AlpcMessageAttributeFlags.Handle);
var handles = attribute.Handles.Select(h => new AlpcHandleAttr32()
{
Handle = h.Handle,
ObjectType = h.ObjectType,
Flags = h.Flags,
DesiredAccess = h.DesiredAccess
}
);
var handle_buffer = _resources.AddResource(handles.ToArray().ToBuffer());
attr.Result = new AlpcHandleAttrIndirect()
{
HandleAttrArray = handle_buffer.DangerousGetHandle(),
HandleCount = count,
Flags = AlpcHandleAttrFlags.Indirect
};
}
else
{
var attr = GetAttribute <AlpcHandleAttr>(AlpcMessageAttributeFlags.Handle);
AlpcHandleMessageAttributeEntry handle = attribute.Handles.First();
attr.Result = new AlpcHandleAttr()
{
Flags = handle.Flags,
ObjectType = handle.ObjectType,
Handle = new IntPtr(handle.Handle),
DesiredAccess = handle.DesiredAccess
};
}
}
internal void GetHandleAttribute(AlpcHandleMessageAttribute attribute, NtAlpc port, AlpcMessage message)
{
var attr = GetAttribute <AlpcHandleAttr>(AlpcMessageAttributeFlags.Handle).Result;
if ((attr.Flags & AlpcHandleAttrFlags.Indirect) == AlpcHandleAttrFlags.Indirect)
{
if (port == null || message == null)
{
throw new ArgumentException("Can't rebuild indirect handle attribute without port and message");
}
GetIndirectHandleAttribute(attribute, port, message);
}
else if (attr.Handle != IntPtr.Zero)
{
attribute.SetHandles(new AlpcHandleMessageAttributeEntry[] { new AlpcHandleMessageAttributeEntry(attr) });
}
else
{
attribute.SetHandles(new AlpcHandleMessageAttributeEntry[0]);
}
}
