362 lines
9.7 KiB
C
362 lines
9.7 KiB
C
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/*++
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Copyright (c) 1992 Microsoft Corporation
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Module Name:
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detect.c
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Abstract:
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Author:
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Thomas J. Dimitri (TommyD) 08-May-1992
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Environment:
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Kernel Mode - Or whatever is the equivalent on OS/2 and DOS.
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Revision History:
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--*/
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#include "asyncall.h"
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VOID
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SerialFlushReads(
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PASYNC_INFO pInfo);
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NTSTATUS
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AsyncDetectCompletionRoutine(
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IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp,
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IN PASYNC_INFO pInfo)
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/*++
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This is the IO Completion routine for ReadFrame.
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--*/
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{
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NTSTATUS status;
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PASYNC_FRAME pFrame;
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PUCHAR frameStart;
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DbgTracef(-1,("Entering AsyncDetectCompletionRoutine\n"));
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status = Irp->IoStatus.Status;
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pInfo->BytesRead = (ULONG)Irp->IoStatus.Information;
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IoFreeIrp(Irp);
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pFrame=pInfo->AsyncFrame;
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DbgTracef(2,("DET PortState = %u for Info 0x%.8x\n", pInfo->PortState, pInfo));
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//
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// check if this port is closing down or already closed
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//
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if (pInfo->PortState == PORT_CLOSING ||
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pInfo->PortState == PORT_CLOSED) {
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if (pInfo->PortState == PORT_CLOSED) {
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DbgTracef(-2,("ASYNC: Port closed - but still reading on it!\n"));
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}
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//
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// Acknowledge that the port is closed
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//
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KeSetEvent(
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&pInfo->ClosingEvent, // Event
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1, // Priority
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(BOOLEAN)FALSE); // Wait (does not follow)
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//
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// Ok, if this happens, we are shutting down. Stop
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// posting reads. Don't make it try to deallocate the irp!
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//
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return(STATUS_MORE_PROCESSING_REQUIRED);
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}
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//
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// If the port is close and we are still posting reads, something
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// is seriously wrong here!
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//
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if (pInfo->PortState == PORT_CLOSED) {
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DbgTracef(-2, ("ASYNC: !!Whoa, I'm reading bytes on a dead port!!\n"));
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}
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//
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// Send off a irp to check comm status
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//
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AsyncCheckCommStatus(pInfo);
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switch (status) {
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case STATUS_SUCCESS:
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//
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// Look at the first byte and see if we can
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// detect the framing.
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//
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frameStart=pFrame->Frame + PPP_PADDING;
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//
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// NOTE: New RAS framing clients come in with 0x02 not 0x01
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//
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if (frameStart[0] == SYN && (frameStart[1]==0x01 || frameStart[1] == 0x02)) {
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ULONG bytesWanted;
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PUCHAR frameStart2;
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pInfo->SetLinkInfo.SendFramingBits =
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pInfo->SetLinkInfo.RecvFramingBits = RAS_FRAMING;
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DbgTracef(-1,("ASYNC: RAS framing detected\n"));
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frameStart2=pFrame->Frame+10;
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//
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// Adjust buffer for old RAS read
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//
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ASYNC_MOVE_MEMORY(
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frameStart2,
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frameStart,
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6);
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frameStart=frameStart2;
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bytesWanted=(frameStart[2]*256)+(frameStart[3]);
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if (bytesWanted > (ULONG)(max( pInfo->Adapter->MaxFrameSize, DEFAULT_EXPANDED_PPP_MAX_FRAME_SIZE ))) {
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DbgTracef(-1,("---ASYNC: Frame too large -- size: %d!\n", bytesWanted));
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//
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// set frame start to non-SYN character
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//
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*frameStart = 0;
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pInfo->BytesRead=0;
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pInfo->BytesWanted=6;
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//
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// break added to fix problem where frame has length
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// greater than max frame size. This will send us back
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// to detect the next frame! Added 10/31/95 by TonyBe.
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//
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break;
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}
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// if this is the first we posted, post another to get
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// rest of frame.
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if (pInfo->BytesRead == 6) {
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pInfo->BytesRead=6;
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pInfo->BytesWanted=bytesWanted +
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// SYN+SOH+LEN+ETX+CRC
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1 + 1 + 2 + 1 + 2 -
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6;
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DbgTracef(2,("---Posting second read for %d bytes\n",pInfo->BytesWanted));
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}
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} else
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//
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// It turns out that NetManage send the flag byte at the
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// end always. This means taht their first frame is wrong.
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// Anyway, this throws off the detect routine. So, we
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// will be robust and accept frames without the FLAG_BYTE.
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//
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if ((frameStart[0] == PPP_FLAG_BYTE && frameStart[1]==0xFF) ||
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(frameStart[0] == 0xFF && frameStart[1]==PPP_ESC_BYTE)) {
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pInfo->SetLinkInfo.SendFramingBits =
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pInfo->SetLinkInfo.RecvFramingBits = PPP_FRAMING;
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pInfo->SetLinkInfo.SendACCM=0xFFFFFFFF;
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DbgTracef(-1,("ASYNC: PPP framing detected\n"));
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}
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else {
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//
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// Read again!
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//
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DbgTracef(-1,("ASYNC: No framing detected yet\n"));
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DbgTracef(-1,("ASYNC: Got %.2x %.2x %.2x %.2x %.2x %.2x\n",
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frameStart[0],
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frameStart[1],
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frameStart[2],
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frameStart[3],
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frameStart[4],
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frameStart[5]));
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break;
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}
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//
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// set framing mode active
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//
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pInfo->PortState = PORT_FRAMING;
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//
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// Send off the worker thread to start reading frames
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// off this port - we want to be at passive level otherwise
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// it don't work.
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//
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ExInitializeWorkItem(&(pInfo->WorkItem),
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(PWORKER_THREAD_ROUTINE)AsyncStartReads,
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pInfo);
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ExQueueWorkItem(&(pInfo->WorkItem), DelayedWorkQueue);
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return(STATUS_MORE_PROCESSING_REQUIRED);
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case STATUS_TIMEOUT:
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DbgTracef(-1,("---ASYNC: detect Status %x%0.8x on read\n", status));
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break;
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case STATUS_CANCELLED:
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case STATUS_PORT_DISCONNECTED:
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default:
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return(STATUS_MORE_PROCESSING_REQUIRED);
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}
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//
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// Wipe out rest of this buffer
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//
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SerialFlushReads(pInfo);
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KeClearEvent(&pInfo->DetectEvent);
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//
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// Here we are at the end of processing this IRP so we go
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// ahead and post another read from the serial port.
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//
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// this is done on a worker since we run out of stack otherwise
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//
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ExInitializeWorkItem(&(pInfo->WorkItem),
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(PWORKER_THREAD_ROUTINE) AsyncDetectRead,
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pInfo);
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ExQueueWorkItem(&(pInfo->WorkItem), DelayedWorkQueue);
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// We return STATUS_MORE_PROCESSING_REQUIRED so that the
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// IoCompletionRoutine will stop working on the IRP.
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//
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return(STATUS_MORE_PROCESSING_REQUIRED);
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}
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NTSTATUS
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AsyncDetectRead(
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IN PASYNC_INFO pInfo)
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/*++
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--*/
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{
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NTSTATUS status;
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PIRP irp;
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PDEVICE_OBJECT deviceObject=pInfo->DeviceObject;
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PFILE_OBJECT fileObject=pInfo->FileObject;
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PIO_STACK_LOCATION irpSp;
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PASYNC_FRAME pFrame;
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PASYNC_ADAPTER pAdapter=pInfo->Adapter;
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DbgTracef(-1,("Entering AsyncDetectRead\n"));
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do {
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if (pInfo->PortState == PORT_CLOSING ||
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pInfo->PortState == PORT_CLOSED) {
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status = STATUS_SUCCESS;
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break;
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}
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// get ptr to first frame in list...
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pFrame=pInfo->AsyncFrame;
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irp =
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IoAllocateIrp(pInfo->DeviceObject->StackSize, (BOOLEAN)FALSE);
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// Setup this irp with defaults
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AsyncSetupIrp(pFrame, irp);
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irp->AssociatedIrp.SystemBuffer =
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irp->UserBuffer =
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pFrame->Frame + PPP_PADDING;
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//
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// Get a pointer to the stack location for the first driver. This will be
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// used to pass the original function codes and parameters.
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//
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irpSp = IoGetNextIrpStackLocation(irp);
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irpSp->MajorFunction = IRP_MJ_READ;
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irpSp->FileObject = fileObject;
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if (fileObject->Flags & FO_WRITE_THROUGH) {
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irpSp->Flags = SL_WRITE_THROUGH;
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}
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//
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// If this write operation is to be performed without any caching, set the
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// appropriate flag in the IRP so no caching is performed.
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//
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irp->Flags |= IRP_READ_OPERATION;
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if (fileObject->Flags & FO_NO_INTERMEDIATE_BUFFERING) {
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irp->Flags |= IRP_NOCACHE;
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}
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//
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// Copy the caller's parameters to the service-specific portion of the
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// IRP.
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//
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irpSp->Parameters.Read.Length = 6; // from frame...
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irpSp->Parameters.Read.Key = 0; // we don't use a key
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irpSp->Parameters.Read.ByteOffset = fileObject->CurrentByteOffset;
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IoSetCompletionRoutine(
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irp, // irp to use
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AsyncDetectCompletionRoutine, // routine to call when irp is done
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pInfo, // context to pass routine
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TRUE, // call on success
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TRUE, // call on error
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TRUE); // call on cancel
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//
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// We DO NOT insert the packet at the head of the IRP list for the thread.
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// because we do NOT really have an IoCompletionRoutine that does
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// anything with the thread.
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//
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//
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// Now simply invoke the driver at its dispatch entry with the IRP.
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//
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status = IoCallDriver(deviceObject, irp);
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} while (FALSE);
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KeSetEvent(&pInfo->DetectEvent,
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1,
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FALSE);
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return(status);
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}
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