/// <summary>
/// Creates a new pipe.
/// </summary>
/// <param name="AnId">The pipe's Id.</param>
/// <param name="outpoint">The outpoint of the pipe.</param>
/// <param name="inpoint">The inpoint of the pipe.</param>
/// <param name="BufferSize">The size of buffer to use within the pipe.</param>
public Pipe(int AnId, PipeOutpoint outpoint, PipeInpoint inpoint, int BufferSize)
{
Id = AnId;
Outpoint = outpoint;
Inpoint = inpoint;
Buffer = new byte[BufferSize];
DataAvailable = 0;
ThreadsWaitingToRead = new UInt32Queue(5, true);
ThreadsWaitingToWrite = new UInt32Queue(5, true);
SizesWaitingToWrite = new UInt32Queue(5, true);
}
/// <summary>
/// Attempts to create a new pipe.
/// </summary>
/// <param name="InProcessId">The Id of the target process which owns the inpoint.</param>
/// <param name="OutProcessId">The Id of the target process which owns the outpoint.</param>
/// <param name="request">A pointer to the request structure (Also used to store the result).</param>
/// <returns>True if the request was successful. Otherwise, false.</returns>
public static bool CreatePipe(uint InProcessId, uint OutProcessId, CreatePipeRequest *request)
{
// Validate inputs
// - Check out process exists
// - Check in process exists
// - Check request isn't null (should've been pre-allocated)
Process InProcess = ProcessManager.GetProcessById(InProcessId);
if (InProcess == null)
{
return(false);
}
else if (ProcessManager.GetProcessById(OutProcessId) == null)
{
return(false);
}
else if (request == null)
{
return(false);
}
// Need access to the request structure
bool ShouldDisableKernelAccessToProcessMemory = true;
ProcessManager.EnableKernelAccessToProcessMemory(InProcessId);
bool OK = true;
// Find the outpoint
PipeOutpoint outpoint = GetOutpoint(OutProcessId, request->Class, request->Subclass);
// Check that we actually found the outpoint
if (outpoint == null)
{
OK = false;
}
if (OK)
{
// Check there are sufficient connections available
if (outpoint.NumConnections >= outpoint.MaxConnections &&
outpoint.MaxConnections != PipeConstants.UnlimitedConnections)
{
OK = false;
}
if (OK)
{
// Create new inpoint
PipeInpoint inpoint = new PipeInpoint(InProcessId, request->Class, request->Subclass);
// Create new pipe
Pipe pipe = new Pipe(PipeIdGenerator++, outpoint, inpoint, request->BufferSize);
// Add new pipe to list of pipes
Pipes.Add(pipe);
// Increment number of connections to the outpoint
outpoint.NumConnections++;
// Set result information
request->Result.Id = pipe.Id;
ShouldDisableKernelAccessToProcessMemory = false;
ProcessManager.DisableKernelAccessToProcessMemory(InProcessId);
// Wake any threads (/processes) which were waiting on a pipe to be created
WakeWaitingThreads(outpoint, pipe.Id);
}
}
if (ShouldDisableKernelAccessToProcessMemory)
{
ProcessManager.DisableKernelAccessToProcessMemory(InProcessId);
}
return(OK);
}
/// <summary>
/// Creates a new pipe.
/// </summary>
/// <param name="AnId">The pipe's Id.</param>
/// <param name="outpoint">The outpoint of the pipe.</param>
/// <param name="inpoint">The inpoint of the pipe.</param>
/// <param name="BufferSize">The size of buffer to use within the pipe.</param>
public Pipe(int AnId, PipeOutpoint outpoint, PipeInpoint inpoint, int BufferSize)
{
Id = AnId;
Outpoint = outpoint;
Inpoint = inpoint;
Buffer = new byte[BufferSize];
DataAvailable = 0;
ThreadsWaitingToRead = new UInt32Queue(5, true);
ThreadsWaitingToWrite = new UInt32Queue(5, true);
SizesWaitingToWrite = new UInt32Queue(5, true);
}
/// <summary>
/// Attempts to create a new pipe.
/// </summary>
/// <param name="InProcessId">The Id of the target process which owns the inpoint.</param>
/// <param name="OutProcessId">The Id of the target process which owns the outpoint.</param>
/// <param name="request">A pointer to the request structure (Also used to store the result).</param>
/// <returns>True if the request was successful. Otherwise, false.</returns>
public static bool CreatePipe(uint InProcessId, uint OutProcessId, CreatePipeRequest* request)
{
// Validate inputs
// - Check out process exists
// - Check in process exists
// - Check request isn't null (should've been pre-allocated)
Process InProcess = ProcessManager.GetProcessById(InProcessId);
if (InProcess == null)
{
return false;
}
else if (ProcessManager.GetProcessById(OutProcessId) == null)
{
return false;
}
else if (request == null)
{
return false;
}
// Merge memory layouts
// so we can access the request structure
MemoryLayout OriginalMemoryLayout = SystemCallsHelpers.EnableAccessToMemoryOfProcess(InProcess);
bool OK = true;
// Find the outpoint
PipeOutpoint outpoint = GetOutpoint(OutProcessId, request->Class, request->Subclass);
// Check that we actually found the outpoint
if (outpoint == null)
{
OK = false;
}
if (OK)
{
// Check there are sufficient connections available
if (outpoint.NumConnections >= outpoint.MaxConnections &&
outpoint.MaxConnections != PipeConstants.UnlimitedConnections)
{
OK = false;
}
if (OK)
{
// Create new inpoint
PipeInpoint inpoint = new PipeInpoint(InProcessId, request->Class, request->Subclass);
// Create new pipe
Pipe pipe = new Pipe(PipeIdGenerator++, outpoint, inpoint, request->BufferSize);
// Add new pipe to list of pipes
Pipes.Add(pipe);
// Increment number of connections to the outpoint
outpoint.NumConnections++;
// Set result information
request->Result.Id = pipe.Id;
// Wake any threads (/processes) which were waiting on a pipe to be created
WakeWaitingThreads(outpoint, pipe.Id);
}
}
SystemCallsHelpers.DisableAccessToMemoryOfProcess(OriginalMemoryLayout);
return OK;
}
