/// <summary>
/// Helper method to create a PowerShell transport named pipe via native API, along
/// with a returned .Net NamedPipeServerStream object wrapping the named pipe.
/// </summary>
/// <param name="pipeName">Named pipe core name.</param>
/// <param name="securityDesc"></param>
/// <returns>NamedPipeServerStream</returns>
internal static NamedPipeServerStream CreateNamedPipe(
string pipeName,
uint maxNumberOfServerInstances,
PipeSecurity pipeSecurity)
{
string fullPipeName = @"\\.\pipe\" + pipeName;
CommonSecurityDescriptor securityDesc = new CommonSecurityDescriptor(false, false, pipeSecurity.GetSecurityDescriptorBinaryForm(), 0);
// Create optional security attributes based on provided PipeSecurity.
NamedPipeNative.SECURITY_ATTRIBUTES securityAttributes = null;
GCHandle?securityDescHandle = null;
if (securityDesc != null)
{
byte[] securityDescBuffer = new byte[securityDesc.BinaryLength];
securityDesc.GetBinaryForm(securityDescBuffer, 0);
securityDescHandle = GCHandle.Alloc(securityDescBuffer, GCHandleType.Pinned);
securityAttributes = NamedPipeNative.GetSecurityAttributes(securityDescHandle.Value);
}
uint openMode = NamedPipeNative.PIPE_ACCESS_DUPLEX | NamedPipeNative.FILE_FLAG_OVERLAPPED;
if (maxNumberOfServerInstances == 1)
{
openMode |= NamedPipeNative.FILE_FLAG_FIRST_PIPE_INSTANCE;
}
// Create named pipe.
SafePipeHandle pipeHandle = NamedPipeNative.CreateNamedPipe(
fullPipeName,
openMode,
NamedPipeNative.PIPE_TYPE_BYTE | NamedPipeNative.PIPE_READMODE_BYTE,
maxNumberOfServerInstances,
1,
1,
0,
securityAttributes);
int lastError = Marshal.GetLastWin32Error();
if (securityDescHandle != null)
{
securityDescHandle.Value.Free();
}
if (pipeHandle.IsInvalid)
{
throw new InvalidOperationException();
}
// Create the .Net NamedPipeServerStream wrapper.
try
{
return(new NamedPipeServerStream(
PipeDirection.InOut,
true, // IsAsync
false, // IsConnected
pipeHandle));
}
catch (Exception)
{
pipeHandle.Dispose();
throw;
}
}