493 lines
13 KiB
C
493 lines
13 KiB
C
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/*++
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Copyright (c) 1995 Microsoft Corporation
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Module Name:
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net\routing\ipx\sap\lpcmgr.c
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Abstract:
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This module implements LPC interface supported by SAP agent
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Author:
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Vadim Eydelman 05-15-1995
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Revision History:
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--*/
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#include "sapp.h"
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// Context kept for each client that connects to us
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typedef struct _LPC_CLIENT_CONTEXT {
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LIST_ENTRY LCC_Link; // Link in client list
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HANDLE LCC_Port; // Port through which we talk
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LONG LCC_RefCount; // Reference count of this context block
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} LPC_CLIENT_CONTEXT, *PLPC_CLIENT_CONTEXT;
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// Queue of LPC requeuest to be processed and associated synchronization
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typedef struct _LPC_QUEUE {
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HANDLE LQ_Port; // LPC communication port
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HANDLE LQ_Thread; // Thread to wait on LPC port
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PLPC_PARAM_BLOCK LQ_Request; // Pending request
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LIST_ENTRY LQ_ClientList; // List of connected clients
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CRITICAL_SECTION LQ_Lock; // Protection
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} LPC_QUEUE, *PLPC_QUEUE;
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LPC_QUEUE LpcQueue;
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DWORD WINAPI
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LPCThread (
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LPVOID param
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);
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/*++
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*******************************************************************
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I n i t i a l i z e L P C S t u f f
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Routine Description:
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Allocates resources neccessary to implement LPC interface
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Arguments:
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none
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Return Value:
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NO_ERROR - port was created OK
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other - operation failed (windows error code)
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*******************************************************************
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--*/
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DWORD
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InitializeLPCStuff (
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void
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) {
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InitializeCriticalSection (&LpcQueue.LQ_Lock);
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InitializeListHead (&LpcQueue.LQ_ClientList);
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LpcQueue.LQ_Request = NULL;
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LpcQueue.LQ_Port = NULL;
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LpcQueue.LQ_Thread = NULL;
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return NO_ERROR;
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}
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/*++
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*******************************************************************
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S t a r t L P C
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Routine Description:
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Start SAP LPC interface
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Arguments:
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None
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Return Value:
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NO_ERROR - LPC interface was started OK
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other - operation failed (windows error code)
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*******************************************************************
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--*/
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DWORD
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StartLPC (
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void
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) {
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DWORD status;
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UNICODE_STRING UnicodeName;
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OBJECT_ATTRIBUTES ObjectAttributes;
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RtlInitUnicodeString(&UnicodeName, NWSAP_BIND_PORT_NAME_W);
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InitializeObjectAttributes(&ObjectAttributes,
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&UnicodeName,
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0,
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NULL,
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NULL);
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LpcQueue.LQ_Port = NULL;
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status = NtCreatePort(&LpcQueue.LQ_Port,
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&ObjectAttributes,
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0,
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NWSAP_BS_PORT_MAX_MESSAGE_LENGTH,
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NWSAP_BS_PORT_MAX_MESSAGE_LENGTH * 32);
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if (NT_SUCCESS(status)) {
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DWORD threadID;
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LpcQueue.LQ_Thread = CreateThread (
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NULL,
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0,
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&LPCThread,
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NULL,
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0,
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&threadID);
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if (LpcQueue.LQ_Thread!=NULL)
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return NO_ERROR;
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else {
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status = GetLastError ();
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Trace (DEBUG_FAILURES, "File: %s, line %ld."
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" Failed to start LPC thread (%0lx).",
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__FILE__, __LINE__, status);
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}
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NtClose (LpcQueue.LQ_Port);
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LpcQueue.LQ_Port = NULL;
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}
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else {
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Trace (DEBUG_FAILURES, "File: %s, line %ld."
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" Failed to create LPC port(%0lx).",
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__FILE__, __LINE__, status);
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}
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return status;
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}
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/*++
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*******************************************************************
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S h u t d o w n L P C
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Routine Description:
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Shuts SAP LPC interface down, closes all active sessions
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Arguments:
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None
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Return Value:
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NO_ERROR - LPC interface was shutdown OK
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other - operation failed (windows error code)
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*******************************************************************
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--*/
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DWORD
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ShutdownLPC (
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void
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) {
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EnterCriticalSection (&LpcQueue.LQ_Lock);
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if (LpcQueue.LQ_Thread!=NULL) {
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UNICODE_STRING unistring;
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NTSTATUS status;
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SECURITY_QUALITY_OF_SERVICE qos;
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HANDLE lpcPortHandle;
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NWSAP_REQUEST_MESSAGE request;
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LeaveCriticalSection (&LpcQueue.LQ_Lock);
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/** Fill out the security quality of service **/
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qos.Length = sizeof(qos);
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qos.ImpersonationLevel = SecurityImpersonation;
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qos.ContextTrackingMode = SECURITY_DYNAMIC_TRACKING;
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qos.EffectiveOnly = TRUE;
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/** Setup the unicode string of the port name **/
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RtlInitUnicodeString(&unistring, NWSAP_BIND_PORT_NAME_W);
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/** Do the connect **/
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status = NtConnectPort(
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&lpcPortHandle, /* We get a handle back */
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&unistring, /* Port name to connect to */
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&qos, /* Quality of service */
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NULL, /* Client View */
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NULL, /* Server View */
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NULL, /* MaxMessageLength */
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NULL, /* ConnectionInformation */
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NULL); /* ConnectionInformationLength */
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/** If error - just return it **/
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ASSERT (NT_SUCCESS(status));
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request.MessageType = NWSAP_LPCMSG_STOP;
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request.PortMessage.u1.s1.DataLength = (USHORT)(sizeof(request) - sizeof(PORT_MESSAGE));
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request.PortMessage.u1.s1.TotalLength = sizeof(request);
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request.PortMessage.u2.ZeroInit = 0;
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request.PortMessage.MessageId = 0;
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/** Send it and get a response **/
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status = NtRequestPort(
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lpcPortHandle,
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(PPORT_MESSAGE)&request);
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ASSERT (NT_SUCCESS(status));
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status = WaitForSingleObject (LpcQueue.LQ_Thread, INFINITE);
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ASSERT (status==WAIT_OBJECT_0);
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CloseHandle (lpcPortHandle);
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EnterCriticalSection (&LpcQueue.LQ_Lock);
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CloseHandle (LpcQueue.LQ_Thread);
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LpcQueue.LQ_Thread = NULL;
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}
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while (!IsListEmpty (&LpcQueue.LQ_ClientList)) {
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PLPC_CLIENT_CONTEXT clientContext = CONTAINING_RECORD (
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LpcQueue.LQ_ClientList.Flink,
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LPC_CLIENT_CONTEXT,
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LCC_Link);
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RemoveEntryList (&clientContext->LCC_Link);
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NtClose (clientContext->LCC_Port);
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clientContext->LCC_RefCount -= 1;
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if (clientContext->LCC_RefCount<0)
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GlobalFree (clientContext);
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}
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if (LpcQueue.LQ_Request!=NULL) {
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BOOL res;
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LpcQueue.LQ_Request->client = NULL;
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ProcessCompletedLpcRequest (LpcQueue.LQ_Request);
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LpcQueue.LQ_Request = NULL;
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}
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LeaveCriticalSection (&LpcQueue.LQ_Lock);
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NtClose (LpcQueue.LQ_Port);
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LpcQueue.LQ_Port = NULL;
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return NO_ERROR;
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}
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/*++
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*******************************************************************
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D e l e t e L P C S t u f f
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Routine Description:
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Disposes of resources allocated for LPC interface
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Arguments:
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None
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Return Value:
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None
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*******************************************************************
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--*/
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VOID
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DeleteLPCStuff (
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void
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) {
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if (LpcQueue.LQ_Port!=NULL)
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ShutdownLPC ();
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DeleteCriticalSection (&LpcQueue.LQ_Lock);
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}
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/*++
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*******************************************************************
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L P C T h r e a d
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Routine Description:
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Thread to be used to wait for and initially process LPC requests
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Arguments:
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None
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Return Value:
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None
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*******************************************************************
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--*/
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#if _MSC_FULL_VER >= 13008827
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#pragma warning(push)
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#pragma warning(disable:4715) // Not all control paths return (due to infinite loop)
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#endif
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DWORD WINAPI
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LPCThread (
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LPVOID param
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) {
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while (1) {
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if (InitLPCItem ()!=NO_ERROR)
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// Sleep for a while if there is an error and we have to continue
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Sleep (SAP_ERROR_COOL_OFF_TIME);
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}
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return NO_ERROR;
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}
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#if _MSC_FULL_VER >= 13008827
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#pragma warning(pop)
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#endif
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/*++
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*******************************************************************
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P r o c e s s L P C R e q u e s t s
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Routine Description:
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Waits for requests on LPC port and processes them
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Client requests that require additional processing by other SAP
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components are enqued into completion queue.
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This routine returns only when it encounters a request that requires
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additional processing or when error occurs
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Arguments:
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lreq - LPC parameter block to be filled and posted to completions queue
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Return Value:
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NO_ERROR - LPC request was received and posted to completio queue
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other - operation failed (LPC supplied error code)
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*******************************************************************
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--*/
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DWORD
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ProcessLPCRequests (
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PLPC_PARAM_BLOCK lreq
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) {
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DWORD status;
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PLPC_CLIENT_CONTEXT clientContext;
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BOOL res;
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Trace (DEBUG_LPCREQ, "ProcessLPCRequests: entered.");
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EnterCriticalSection (&LpcQueue.LQ_Lock);
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LpcQueue.LQ_Request = lreq;
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Trace (DEBUG_LPCREQ, "ProcessLPCRequests: go lpcqueue lock.");
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while (TRUE) {
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LeaveCriticalSection (&LpcQueue.LQ_Lock);
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status = NtReplyWaitReceivePort(LpcQueue.LQ_Port,
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&clientContext,
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NULL,
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(PPORT_MESSAGE)lreq->request);
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EnterCriticalSection (&LpcQueue.LQ_Lock);
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if (NT_SUCCESS (status)) {
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switch (lreq->request->PortMessage.u2.s2.Type) {
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case LPC_CONNECTION_REQUEST:
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clientContext = (PLPC_CLIENT_CONTEXT)GlobalAlloc (
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GMEM_FIXED,
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sizeof (LPC_CLIENT_CONTEXT));
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if (clientContext!=NULL) {
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clientContext->LCC_Port = NULL;
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clientContext->LCC_RefCount = 0;
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status = NtAcceptConnectPort(
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&clientContext->LCC_Port,
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clientContext,
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&lreq->request->PortMessage,
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TRUE,
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NULL,
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NULL);
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if (NT_SUCCESS(status)) {
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status = NtCompleteConnectPort (
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clientContext->LCC_Port);
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if (NT_SUCCESS (status)) {
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InsertTailList (&LpcQueue.LQ_ClientList,
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&clientContext->LCC_Link);
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Trace (DEBUG_LPC, "New LPC client: %0lx.", clientContext);
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continue;
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}
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else
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Trace (DEBUG_FAILURES,
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"File: %s, line %ld."
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" Error in complete connect(nts:%0lx)."
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__FILE__, __LINE__, status);
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NtClose (clientContext->LCC_Port);
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}
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else
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Trace (DEBUG_FAILURES, "File: %s, line %ld."
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" Error in accept connect(%0lx)."
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__FILE__, __LINE__, status);
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GlobalFree (clientContext);
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}
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else {
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HANDLE Port;
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Trace (DEBUG_FAILURES, "File: %s, line %ld."
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" Could not allocate lpc client block(gle:%ld."
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__FILE__, __LINE__, GetLastError ());
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status = NtAcceptConnectPort(
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&Port,
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NULL,
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&lreq->request->PortMessage,
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FALSE,
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NULL,
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NULL);
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if (!NT_SUCCESS(status))
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Trace (DEBUG_FAILURES,
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"File: %s, line %ld."
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" Error in reject connect(nts:%0lx)."
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__FILE__, __LINE__, status);
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}
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continue;
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case LPC_REQUEST:
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lreq->client = (HANDLE)clientContext;
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clientContext->LCC_RefCount += 1;
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ProcessCompletedLpcRequest (LpcQueue.LQ_Request);
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LpcQueue.LQ_Request = NULL;
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break;
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case LPC_PORT_CLOSED:
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case LPC_CLIENT_DIED:
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Trace (DEBUG_LPC,
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" LPC client %0lx died.", clientContext);
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|
|
RemoveEntryList (&clientContext->LCC_Link);
|
||
|
|
NtClose (clientContext->LCC_Port);
|
||
|
|
clientContext->LCC_RefCount -= 1;
|
||
|
|
if (clientContext->LCC_RefCount<0)
|
||
|
|
GlobalFree (clientContext);
|
||
|
|
continue;
|
||
|
|
case LPC_DATAGRAM:
|
||
|
|
if (lreq->request->MessageType==NWSAP_LPCMSG_STOP) {
|
||
|
|
LeaveCriticalSection (&LpcQueue.LQ_Lock);
|
||
|
|
Trace (DEBUG_LPC, " Stop message received -> exiting.");
|
||
|
|
ExitThread (0);
|
||
|
|
}
|
||
|
|
default:
|
||
|
|
Trace (DEBUG_FAILURES,
|
||
|
|
"Unknown or not supported lpc message: %ld.",
|
||
|
|
lreq->request->PortMessage.u2.s2.Type);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
Trace (DEBUG_FAILURES, "File: %s, line %ld."
|
||
|
|
" Error on wait lpc request(%0lx).",
|
||
|
|
__FILE__, __LINE__,
|
||
|
|
status);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
LeaveCriticalSection (&LpcQueue.LQ_Lock);
|
||
|
|
|
||
|
|
return status;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/*++
|
||
|
|
*******************************************************************
|
||
|
|
S e n d L P C R e p l y
|
||
|
|
|
||
|
|
Routine Description:
|
||
|
|
Send reply for LPC request
|
||
|
|
Arguments:
|
||
|
|
client - context associated with client to reply to
|
||
|
|
request - request to which to reply
|
||
|
|
reply - reply to send
|
||
|
|
Return Value:
|
||
|
|
NO_ERROR - LPC reply was sent OK
|
||
|
|
other - operation failed (LPC supplied error code)
|
||
|
|
*******************************************************************
|
||
|
|
--*/
|
||
|
|
DWORD
|
||
|
|
SendLPCReply (
|
||
|
|
HANDLE client,
|
||
|
|
PNWSAP_REQUEST_MESSAGE request,
|
||
|
|
PNWSAP_REPLY_MESSAGE reply
|
||
|
|
) {
|
||
|
|
DWORD status;
|
||
|
|
PLPC_CLIENT_CONTEXT clientContext = (PLPC_CLIENT_CONTEXT)client;
|
||
|
|
|
||
|
|
EnterCriticalSection (&LpcQueue.LQ_Lock);
|
||
|
|
if (clientContext->LCC_RefCount>0) {
|
||
|
|
reply->PortMessage.u1.s1.DataLength =
|
||
|
|
sizeof(*reply) - sizeof(PORT_MESSAGE);
|
||
|
|
reply->PortMessage.u1.s1.TotalLength = sizeof(*reply);
|
||
|
|
reply->PortMessage.u2.ZeroInit = 0;
|
||
|
|
reply->PortMessage.ClientId = request->PortMessage.ClientId;
|
||
|
|
reply->PortMessage.MessageId = request->PortMessage.MessageId;
|
||
|
|
|
||
|
|
status = NtReplyPort(clientContext->LCC_Port, (PPORT_MESSAGE)reply);
|
||
|
|
clientContext->LCC_RefCount -= 1;
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
GlobalFree (clientContext);
|
||
|
|
status = ERROR_INVALID_HANDLE;
|
||
|
|
}
|
||
|
|
LeaveCriticalSection (&LpcQueue.LQ_Lock);
|
||
|
|
|
||
|
|
if (!NT_SUCCESS(status))
|
||
|
|
Trace (DEBUG_FAILURES,
|
||
|
|
"File: %s, line %ld. Error in lpc reply(nts:%0lx).",
|
||
|
|
__FILE__, __LINE__, status);
|
||
|
|
return status;
|
||
|
|
}
|
||
|
|
|
||
|
|
|