/*
* @implemented
*/
NTSTATUS
NTAPI
NtListenPort(IN HANDLE PortHandle,
OUT PPORT_MESSAGE ConnectMessage)
{
NTSTATUS Status;
PAGED_CODE();
LPCTRACE(LPC_LISTEN_DEBUG, "Handle: %lx\n", PortHandle);
/* Wait forever for a connection request. */
for (;;)
{
/* Do the wait */
Status = NtReplyWaitReceivePort(PortHandle,
NULL,
NULL,
ConnectMessage);
/* Accept only LPC_CONNECTION_REQUEST requests. */
if ((Status != STATUS_SUCCESS) ||
(LpcpGetMessageType(ConnectMessage) == LPC_CONNECTION_REQUEST))
{
/* Break out */
break;
}
}
/* Return status */
return Status;
}
/*
* @implemented
*/
NTSTATUS
NTAPI
NtRequestWaitReplyPort(IN HANDLE PortHandle,
IN PPORT_MESSAGE LpcRequest,
IN OUT PPORT_MESSAGE LpcReply)
{
PORT_MESSAGE LocalLpcRequest;
ULONG NumberOfDataEntries;
PLPCP_PORT_OBJECT Port, QueuePort, ReplyPort, ConnectionPort = NULL;
KPROCESSOR_MODE PreviousMode = KeGetPreviousMode();
NTSTATUS Status;
PLPCP_MESSAGE Message;
PETHREAD Thread = PsGetCurrentThread();
BOOLEAN Callback;
PKSEMAPHORE Semaphore;
ULONG MessageType;
PLPCP_DATA_INFO DataInfo;
PAGED_CODE();
LPCTRACE(LPC_SEND_DEBUG,
"Handle: %p. Messages: %p/%p. Type: %lx\n",
PortHandle,
LpcRequest,
LpcReply,
LpcpGetMessageType(LpcRequest));
/* Check if the thread is dying */
if (Thread->LpcExitThreadCalled) return STATUS_THREAD_IS_TERMINATING;
/* Check for user mode access */
if (PreviousMode != KernelMode)
{
_SEH2_TRY
{
/* Probe the full request message and copy the base structure */
ProbeForRead(LpcRequest, sizeof(*LpcRequest), sizeof(ULONG));
ProbeForRead(LpcRequest, LpcRequest->u1.s1.TotalLength, sizeof(ULONG));
LocalLpcRequest = *LpcRequest;
/* Probe the reply message for write */
ProbeForWrite(LpcReply, sizeof(*LpcReply), sizeof(ULONG));
/* Make sure the data entries in the request message are valid */
Status = LpcpVerifyMessageDataInfo(LpcRequest, &NumberOfDataEntries);
if (!NT_SUCCESS(Status))
{
DPRINT1("LpcpVerifyMessageDataInfo failed\n");
return Status;
}
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
DPRINT1("Got exception\n");
return _SEH2_GetExceptionCode();
}
_SEH2_END;
}
/*
* @implemented
*/
NTSTATUS
NTAPI
NtRequestWaitReplyPort(IN HANDLE PortHandle,
IN PPORT_MESSAGE LpcRequest,
IN OUT PPORT_MESSAGE LpcReply)
{
PLPCP_PORT_OBJECT Port, QueuePort, ReplyPort, ConnectionPort = NULL;
KPROCESSOR_MODE PreviousMode = KeGetPreviousMode();
NTSTATUS Status;
PLPCP_MESSAGE Message;
PETHREAD Thread = PsGetCurrentThread();
BOOLEAN Callback;
PKSEMAPHORE Semaphore;
ULONG MessageType;
PAGED_CODE();
LPCTRACE(LPC_SEND_DEBUG,
"Handle: %lx. Messages: %p/%p. Type: %lx\n",
PortHandle,
LpcRequest,
LpcReply,
LpcpGetMessageType(LpcRequest));
/* Check if the thread is dying */
if (Thread->LpcExitThreadCalled) return STATUS_THREAD_IS_TERMINATING;
/* Check if this is an LPC Request */
if (LpcpGetMessageType(LpcRequest) == LPC_REQUEST)
{
/* Then it's a callback */
Callback = TRUE;
}
else if (LpcpGetMessageType(LpcRequest))
{
/* This is a not kernel-mode message */
return STATUS_INVALID_PARAMETER;
}
else
{
/* This is a kernel-mode message without a callback */
LpcRequest->u2.s2.Type |= LPC_REQUEST;
Callback = FALSE;
}
/* Get the message type */
MessageType = LpcRequest->u2.s2.Type;
/* Validate the length */
if (((ULONG)LpcRequest->u1.s1.DataLength + sizeof(PORT_MESSAGE)) >
(ULONG)LpcRequest->u1.s1.TotalLength)
{
/* Fail */
return STATUS_INVALID_PARAMETER;
}
/* Reference the object */
Status = ObReferenceObjectByHandle(PortHandle,
0,
LpcPortObjectType,
PreviousMode,
(PVOID*)&Port,
NULL);
if (!NT_SUCCESS(Status)) return Status;
/* Validate the message length */
if (((ULONG)LpcRequest->u1.s1.TotalLength > Port->MaxMessageLength) ||
((ULONG)LpcRequest->u1.s1.TotalLength <= (ULONG)LpcRequest->u1.s1.DataLength))
{
/* Fail */
ObDereferenceObject(Port);
return STATUS_PORT_MESSAGE_TOO_LONG;
}
/* Allocate a message from the port zone */
Message = LpcpAllocateFromPortZone();
if (!Message)
{
/* Fail if we couldn't allocate a message */
ObDereferenceObject(Port);
return STATUS_NO_MEMORY;
}
/* Check if this is a callback */
if (Callback)
{
/* FIXME: TODO */
Semaphore = NULL; // we'd use the Thread Semaphore here
ASSERT(FALSE);
}
else
{
/* No callback, just copy the message */
_SEH2_TRY
{
/* Copy it */
LpcpMoveMessage(&Message->Request,
LpcRequest,
LpcRequest + 1,
MessageType,
&Thread->Cid);
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
/* Fail */
LpcpFreeToPortZone(Message, 0);
ObDereferenceObject(Port);
_SEH2_YIELD(return _SEH2_GetExceptionCode());
}
_SEH2_END;
/* Acquire the LPC lock */
KeAcquireGuardedMutex(&LpcpLock);
/* Right now clear the port context */
Message->PortContext = NULL;
/* Check if this is a not connection port */
if ((Port->Flags & LPCP_PORT_TYPE_MASK) != LPCP_CONNECTION_PORT)
{
/* We want the connected port */
QueuePort = Port->ConnectedPort;
if (!QueuePort)
{
/* We have no connected port, fail */
LpcpFreeToPortZone(Message, 3);
ObDereferenceObject(Port);
return STATUS_PORT_DISCONNECTED;
}
/* This will be the rundown port */
ReplyPort = QueuePort;
/* Check if this is a communication port */
if ((Port->Flags & LPCP_PORT_TYPE_MASK) == LPCP_CLIENT_PORT)
{
/* Copy the port context and use the connection port */
Message->PortContext = QueuePort->PortContext;
ConnectionPort = QueuePort = Port->ConnectionPort;
if (!ConnectionPort)
{
/* Fail */
LpcpFreeToPortZone(Message, 3);
ObDereferenceObject(Port);
return STATUS_PORT_DISCONNECTED;
}
}
else if ((Port->Flags & LPCP_PORT_TYPE_MASK) !=
LPCP_COMMUNICATION_PORT)
{
/* Use the connection port for anything but communication ports */
ConnectionPort = QueuePort = Port->ConnectionPort;
if (!ConnectionPort)
{
/* Fail */
LpcpFreeToPortZone(Message, 3);
ObDereferenceObject(Port);
return STATUS_PORT_DISCONNECTED;
}
}
/* Reference the connection port if it exists */
if (ConnectionPort) ObReferenceObject(ConnectionPort);
}
else
{
/* Otherwise, for a connection port, use the same port object */
QueuePort = ReplyPort = Port;
}
/* No reply thread */
Message->RepliedToThread = NULL;
Message->SenderPort = Port;
/* Generate the Message ID and set it */
Message->Request.MessageId = LpcpNextMessageId++;
if (!LpcpNextMessageId) LpcpNextMessageId = 1;
Message->Request.CallbackId = 0;
/* Set the message ID for our thread now */
Thread->LpcReplyMessageId = Message->Request.MessageId;
Thread->LpcReplyMessage = NULL;
/* Insert the message in our chain */
InsertTailList(&QueuePort->MsgQueue.ReceiveHead, &Message->Entry);
InsertTailList(&ReplyPort->LpcReplyChainHead, &Thread->LpcReplyChain);
LpcpSetPortToThread(Thread, Port);
/* Release the lock and get the semaphore we'll use later */
KeEnterCriticalRegion();
KeReleaseGuardedMutex(&LpcpLock);
Semaphore = QueuePort->MsgQueue.Semaphore;
/* If this is a waitable port, wake it up */
if (QueuePort->Flags & LPCP_WAITABLE_PORT)
{
/* Wake it */
KeSetEvent(&QueuePort->WaitEvent, IO_NO_INCREMENT, FALSE);
}
}
/* Now release the semaphore */
LpcpCompleteWait(Semaphore);
KeLeaveCriticalRegion();
/* And let's wait for the reply */
LpcpReplyWait(&Thread->LpcReplySemaphore, PreviousMode);
/* Acquire the LPC lock */
KeAcquireGuardedMutex(&LpcpLock);
/* Get the LPC Message and clear our thread's reply data */
Message = LpcpGetMessageFromThread(Thread);
Thread->LpcReplyMessage = NULL;
Thread->LpcReplyMessageId = 0;
/* Check if we have anything on the reply chain*/
if (!IsListEmpty(&Thread->LpcReplyChain))
{
/* Remove this thread and reinitialize the list */
RemoveEntryList(&Thread->LpcReplyChain);
InitializeListHead(&Thread->LpcReplyChain);
}
/* Release the lock */
KeReleaseGuardedMutex(&LpcpLock);
/* Check if we got a reply */
if (Status == STATUS_SUCCESS)
{
/* Check if we have a valid message */
if (Message)
{
LPCTRACE(LPC_SEND_DEBUG,
"Reply Messages: %p/%p\n",
&Message->Request,
(&Message->Request) + 1);
/* Move the message */
_SEH2_TRY
{
LpcpMoveMessage(LpcReply,
&Message->Request,
(&Message->Request) + 1,
0,
NULL);
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
Status = _SEH2_GetExceptionCode();
}
_SEH2_END;
/* Check if this is an LPC request with data information */
if ((LpcpGetMessageType(&Message->Request) == LPC_REQUEST) &&
(Message->Request.u2.s2.DataInfoOffset))
{
/* Save the data information */
LpcpSaveDataInfoMessage(Port, Message, 0);
}
else
{
/* Otherwise, just free it */
LpcpFreeToPortZone(Message, 0);
}
}
else
{
/* We don't have a reply */
Status = STATUS_LPC_REPLY_LOST;
}
}
/*
* @implemented
*/
NTSTATUS
NTAPI
NtRequestPort(IN HANDLE PortHandle,
IN PPORT_MESSAGE LpcRequest)
{
PLPCP_PORT_OBJECT Port, QueuePort, ConnectionPort = NULL;
KPROCESSOR_MODE PreviousMode = KeGetPreviousMode();
NTSTATUS Status;
PLPCP_MESSAGE Message;
PETHREAD Thread = PsGetCurrentThread();
PKSEMAPHORE Semaphore;
ULONG MessageType;
PAGED_CODE();
LPCTRACE(LPC_SEND_DEBUG,
"Handle: %lx. Message: %p. Type: %lx\n",
PortHandle,
LpcRequest,
LpcpGetMessageType(LpcRequest));
/* Get the message type */
MessageType = LpcRequest->u2.s2.Type | LPC_DATAGRAM;
/* Can't have data information on this type of call */
if (LpcRequest->u2.s2.DataInfoOffset) return STATUS_INVALID_PARAMETER;
/* Validate the length */
if (((ULONG)LpcRequest->u1.s1.DataLength + sizeof(PORT_MESSAGE)) >
(ULONG)LpcRequest->u1.s1.TotalLength)
{
/* Fail */
return STATUS_INVALID_PARAMETER;
}
/* Reference the object */
Status = ObReferenceObjectByHandle(PortHandle,
0,
LpcPortObjectType,
PreviousMode,
(PVOID*)&Port,
NULL);
if (!NT_SUCCESS(Status)) return Status;
/* Validate the message length */
if (((ULONG)LpcRequest->u1.s1.TotalLength > Port->MaxMessageLength) ||
((ULONG)LpcRequest->u1.s1.TotalLength <= (ULONG)LpcRequest->u1.s1.DataLength))
{
/* Fail */
ObDereferenceObject(Port);
return STATUS_PORT_MESSAGE_TOO_LONG;
}
/* Allocate a message from the port zone */
Message = LpcpAllocateFromPortZone();
if (!Message)
{
/* Fail if we couldn't allocate a message */
ObDereferenceObject(Port);
return STATUS_NO_MEMORY;
}
/* No callback, just copy the message */
_SEH2_TRY
{
/* Copy it */
LpcpMoveMessage(&Message->Request,
LpcRequest,
LpcRequest + 1,
MessageType,
&Thread->Cid);
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
/* Fail */
LpcpFreeToPortZone(Message, 0);
ObDereferenceObject(Port);
_SEH2_YIELD(return _SEH2_GetExceptionCode());
}
_SEH2_END;
/* Acquire the LPC lock */
KeAcquireGuardedMutex(&LpcpLock);
/* Right now clear the port context */
Message->PortContext = NULL;
/* Check if this is a not connection port */
if ((Port->Flags & LPCP_PORT_TYPE_MASK) != LPCP_CONNECTION_PORT)
{
/* We want the connected port */
QueuePort = Port->ConnectedPort;
if (!QueuePort)
{
/* We have no connected port, fail */
LpcpFreeToPortZone(Message, 3);
ObDereferenceObject(Port);
return STATUS_PORT_DISCONNECTED;
}
/* Check if this is a communication port */
if ((Port->Flags & LPCP_PORT_TYPE_MASK) == LPCP_CLIENT_PORT)
{
/* Copy the port context and use the connection port */
Message->PortContext = QueuePort->PortContext;
ConnectionPort = QueuePort = Port->ConnectionPort;
if (!ConnectionPort)
{
/* Fail */
LpcpFreeToPortZone(Message, 3);
ObDereferenceObject(Port);
return STATUS_PORT_DISCONNECTED;
}
}
else if ((Port->Flags & LPCP_PORT_TYPE_MASK) !=
LPCP_COMMUNICATION_PORT)
{
/* Use the connection port for anything but communication ports */
ConnectionPort = QueuePort = Port->ConnectionPort;
if (!ConnectionPort)
{
/* Fail */
LpcpFreeToPortZone(Message, 3);
ObDereferenceObject(Port);
return STATUS_PORT_DISCONNECTED;
}
}
/* Reference the connection port if it exists */
if (ConnectionPort) ObReferenceObject(ConnectionPort);
}
else
{
/* Otherwise, for a connection port, use the same port object */
QueuePort = Port;
}
/* Reference QueuePort if we have it */
if (QueuePort && ObReferenceObjectSafe(QueuePort))
{
/* Set sender's port */
Message->SenderPort = Port;
/* Generate the Message ID and set it */
Message->Request.MessageId = LpcpNextMessageId++;
if (!LpcpNextMessageId) LpcpNextMessageId = 1;
Message->Request.CallbackId = 0;
/* No Message ID for the thread */
PsGetCurrentThread()->LpcReplyMessageId = 0;
/* Insert the message in our chain */
InsertTailList(&QueuePort->MsgQueue.ReceiveHead, &Message->Entry);
/* Release the lock and get the semaphore we'll use later */
KeEnterCriticalRegion();
KeReleaseGuardedMutex(&LpcpLock);
/* Now release the semaphore */
Semaphore = QueuePort->MsgQueue.Semaphore;
LpcpCompleteWait(Semaphore);
/* If this is a waitable port, wake it up */
if (QueuePort->Flags & LPCP_WAITABLE_PORT)
{
/* Wake it */
KeSetEvent(&QueuePort->WaitEvent, IO_NO_INCREMENT, FALSE);
}
KeLeaveCriticalRegion();
/* Dereference objects */
if (ConnectionPort) ObDereferenceObject(ConnectionPort);
ObDereferenceObject(QueuePort);
ObDereferenceObject(Port);
LPCTRACE(LPC_SEND_DEBUG, "Port: %p. Message: %p\n", QueuePort, Message);
return STATUS_SUCCESS;
}
Status = STATUS_PORT_DISCONNECTED;
/* All done with a failure*/
LPCTRACE(LPC_SEND_DEBUG,
"Port: %p. Status: %p\n",
Port,
Status);
/* The wait failed, free the message */
if (Message) LpcpFreeToPortZone(Message, 3);
ObDereferenceObject(Port);
if (ConnectionPort) ObDereferenceObject(ConnectionPort);
return Status;
}
/*
* @implemented
*/
NTSTATUS
NTAPI
LpcRequestPort(IN PVOID PortObject,
IN PPORT_MESSAGE LpcMessage)
{
PLPCP_PORT_OBJECT Port = PortObject, QueuePort, ConnectionPort = NULL;
ULONG MessageType;
PLPCP_MESSAGE Message;
KPROCESSOR_MODE PreviousMode = KeGetPreviousMode();
PAGED_CODE();
LPCTRACE(LPC_SEND_DEBUG, "Port: %p. Message: %p\n", Port, LpcMessage);
/* Check if this is a non-datagram message */
if (LpcMessage->u2.s2.Type)
{
/* Get the message type */
MessageType = LpcpGetMessageType(LpcMessage);
/* Validate it */
if ((MessageType < LPC_DATAGRAM) || (MessageType > LPC_CLIENT_DIED))
{
/* Fail */
return STATUS_INVALID_PARAMETER;
}
/* Mark this as a kernel-mode message only if we really came from it */
if ((PreviousMode == KernelMode) &&
(LpcMessage->u2.s2.Type & LPC_KERNELMODE_MESSAGE))
{
/* We did, this is a kernel mode message */
MessageType |= LPC_KERNELMODE_MESSAGE;
}
}
else
{
/* This is a datagram */
MessageType = LPC_DATAGRAM;
}
/* Can't have data information on this type of call */
if (LpcMessage->u2.s2.DataInfoOffset) return STATUS_INVALID_PARAMETER;
/* Validate message sizes */
if (((ULONG)LpcMessage->u1.s1.TotalLength > Port->MaxMessageLength) ||
((ULONG)LpcMessage->u1.s1.TotalLength <= (ULONG)LpcMessage->u1.s1.DataLength))
{
/* Fail */
return STATUS_PORT_MESSAGE_TOO_LONG;
}
/* Allocate a new message */
Message = LpcpAllocateFromPortZone();
if (!Message) return STATUS_NO_MEMORY;
/* Clear the context */
Message->RepliedToThread = NULL;
Message->PortContext = NULL;
/* Copy the message */
LpcpMoveMessage(&Message->Request,
LpcMessage,
LpcMessage + 1,
MessageType,
&PsGetCurrentThread()->Cid);
/* Acquire the LPC lock */
KeAcquireGuardedMutex(&LpcpLock);
/* Check if this is anything but a connection port */
if ((Port->Flags & LPCP_PORT_TYPE_MASK) != LPCP_CONNECTION_PORT)
{
/* The queue port is the connected port */
QueuePort = Port->ConnectedPort;
if (QueuePort)
{
/* Check if this is a client port */
if ((Port->Flags & LPCP_PORT_TYPE_MASK) == LPCP_CLIENT_PORT)
{
/* Then copy the context */
Message->PortContext = QueuePort->PortContext;
ConnectionPort = QueuePort = Port->ConnectionPort;
if (!ConnectionPort)
{
/* Fail */
LpcpFreeToPortZone(Message, 3);
return STATUS_PORT_DISCONNECTED;
}
}
else if ((Port->Flags & LPCP_PORT_TYPE_MASK) != LPCP_COMMUNICATION_PORT)
{
/* Any other kind of port, use the connection port */
ConnectionPort = QueuePort = Port->ConnectionPort;
if (!ConnectionPort)
{
/* Fail */
LpcpFreeToPortZone(Message, 3);
return STATUS_PORT_DISCONNECTED;
}
}
/* If we have a connection port, reference it */
if (ConnectionPort) ObReferenceObject(ConnectionPort);
}
}
else
{
/* For connection ports, use the port itself */
QueuePort = PortObject;
}
/* Make sure we have a port */
if (QueuePort)
{
/* Generate the Message ID and set it */
Message->Request.MessageId = LpcpNextMessageId++;
if (!LpcpNextMessageId) LpcpNextMessageId = 1;
Message->Request.CallbackId = 0;
/* No Message ID for the thread */
PsGetCurrentThread()->LpcReplyMessageId = 0;
/* Insert the message in our chain */
InsertTailList(&QueuePort->MsgQueue.ReceiveHead, &Message->Entry);
/* Release the lock and release the semaphore */
KeEnterCriticalRegion();
KeReleaseGuardedMutex(&LpcpLock);
LpcpCompleteWait(QueuePort->MsgQueue.Semaphore);
/* If this is a waitable port, wake it up */
if (QueuePort->Flags & LPCP_WAITABLE_PORT)
{
/* Wake it */
KeSetEvent(&QueuePort->WaitEvent, IO_NO_INCREMENT, FALSE);
}
/* We're done */
KeLeaveCriticalRegion();
if (ConnectionPort) ObDereferenceObject(ConnectionPort);
LPCTRACE(LPC_SEND_DEBUG, "Port: %p. Message: %p\n", QueuePort, Message);
return STATUS_SUCCESS;
}
/* If we got here, then free the message and fail */
LpcpFreeToPortZone(Message, 3);
if (ConnectionPort) ObDereferenceObject(ConnectionPort);
return STATUS_PORT_DISCONNECTED;
}
/*
* @implemented
*/
NTSTATUS
NTAPI
LpcRequestWaitReplyPort(IN PVOID PortObject,
IN PPORT_MESSAGE LpcRequest,
OUT PPORT_MESSAGE LpcReply)
{
PLPCP_PORT_OBJECT Port, QueuePort, ReplyPort, ConnectionPort = NULL;
KPROCESSOR_MODE PreviousMode = KeGetPreviousMode();
NTSTATUS Status = STATUS_SUCCESS;
PLPCP_MESSAGE Message;
PETHREAD Thread = PsGetCurrentThread();
BOOLEAN Callback = FALSE;
PKSEMAPHORE Semaphore;
USHORT MessageType;
PAGED_CODE();
Port = (PLPCP_PORT_OBJECT)PortObject;
LPCTRACE(LPC_SEND_DEBUG,
"Port: %p. Messages: %p/%p. Type: %lx\n",
Port,
LpcRequest,
LpcReply,
LpcpGetMessageType(LpcRequest));
/* Check if the thread is dying */
if (Thread->LpcExitThreadCalled) return STATUS_THREAD_IS_TERMINATING;
/* Check if this is an LPC Request */
MessageType = LpcpGetMessageType(LpcRequest);
switch (MessageType)
{
/* No type */
case 0:
/* Assume LPC request */
MessageType = LPC_REQUEST;
break;
/* LPC request callback */
case LPC_REQUEST:
/* This is a callback */
Callback = TRUE;
break;
/* Anything else */
case LPC_CLIENT_DIED:
case LPC_PORT_CLOSED:
case LPC_EXCEPTION:
case LPC_DEBUG_EVENT:
case LPC_ERROR_EVENT:
/* Nothing to do */
break;
default:
/* Invalid message type */
return STATUS_INVALID_PARAMETER;
}
/* Set the request type */
LpcRequest->u2.s2.Type = MessageType;
/* Validate the message length */
if (((ULONG)LpcRequest->u1.s1.TotalLength > Port->MaxMessageLength) ||
((ULONG)LpcRequest->u1.s1.TotalLength <= (ULONG)LpcRequest->u1.s1.DataLength))
{
/* Fail */
return STATUS_PORT_MESSAGE_TOO_LONG;
}
/* Allocate a message from the port zone */
Message = LpcpAllocateFromPortZone();
if (!Message)
{
/* Fail if we couldn't allocate a message */
return STATUS_NO_MEMORY;
}
/* Check if this is a callback */
if (Callback)
{
/* FIXME: TODO */
Semaphore = NULL; // we'd use the Thread Semaphore here
ASSERT(FALSE);
return STATUS_NOT_IMPLEMENTED;
}
else
{
/* No callback, just copy the message */
LpcpMoveMessage(&Message->Request,
LpcRequest,
LpcRequest + 1,
0,
&Thread->Cid);
/* Acquire the LPC lock */
KeAcquireGuardedMutex(&LpcpLock);
/* Right now clear the port context */
Message->PortContext = NULL;
/* Check if this is a not connection port */
if ((Port->Flags & LPCP_PORT_TYPE_MASK) != LPCP_CONNECTION_PORT)
{
/* We want the connected port */
QueuePort = Port->ConnectedPort;
if (!QueuePort)
{
/* We have no connected port, fail */
LpcpFreeToPortZone(Message, 3);
return STATUS_PORT_DISCONNECTED;
}
/* This will be the rundown port */
ReplyPort = QueuePort;
/* Check if this is a communication port */
if ((Port->Flags & LPCP_PORT_TYPE_MASK) == LPCP_CLIENT_PORT)
{
/* Copy the port context and use the connection port */
Message->PortContext = QueuePort->PortContext;
ConnectionPort = QueuePort = Port->ConnectionPort;
if (!ConnectionPort)
{
/* Fail */
LpcpFreeToPortZone(Message, 3);
return STATUS_PORT_DISCONNECTED;
}
}
else if ((Port->Flags & LPCP_PORT_TYPE_MASK) !=
LPCP_COMMUNICATION_PORT)
{
/* Use the connection port for anything but communication ports */
ConnectionPort = QueuePort = Port->ConnectionPort;
if (!ConnectionPort)
{
/* Fail */
LpcpFreeToPortZone(Message, 3);
return STATUS_PORT_DISCONNECTED;
}
}
/* Reference the connection port if it exists */
if (ConnectionPort) ObReferenceObject(ConnectionPort);
}
else
{
/* Otherwise, for a connection port, use the same port object */
QueuePort = ReplyPort = Port;
}
/* No reply thread */
Message->RepliedToThread = NULL;
Message->SenderPort = Port;
/* Generate the Message ID and set it */
Message->Request.MessageId = LpcpNextMessageId++;
if (!LpcpNextMessageId) LpcpNextMessageId = 1;
Message->Request.CallbackId = 0;
/* Set the message ID for our thread now */
Thread->LpcReplyMessageId = Message->Request.MessageId;
Thread->LpcReplyMessage = NULL;
/* Insert the message in our chain */
InsertTailList(&QueuePort->MsgQueue.ReceiveHead, &Message->Entry);
InsertTailList(&ReplyPort->LpcReplyChainHead, &Thread->LpcReplyChain);
LpcpSetPortToThread(Thread, Port);
/* Release the lock and get the semaphore we'll use later */
KeEnterCriticalRegion();
KeReleaseGuardedMutex(&LpcpLock);
Semaphore = QueuePort->MsgQueue.Semaphore;
/* If this is a waitable port, wake it up */
if (QueuePort->Flags & LPCP_WAITABLE_PORT)
{
/* Wake it */
KeSetEvent(&QueuePort->WaitEvent, IO_NO_INCREMENT, FALSE);
}
}
/* Now release the semaphore */
LpcpCompleteWait(Semaphore);
KeLeaveCriticalRegion();
/* And let's wait for the reply */
LpcpReplyWait(&Thread->LpcReplySemaphore, PreviousMode);
/* Acquire the LPC lock */
KeAcquireGuardedMutex(&LpcpLock);
/* Get the LPC Message and clear our thread's reply data */
Message = LpcpGetMessageFromThread(Thread);
Thread->LpcReplyMessage = NULL;
Thread->LpcReplyMessageId = 0;
/* Check if we have anything on the reply chain*/
if (!IsListEmpty(&Thread->LpcReplyChain))
{
/* Remove this thread and reinitialize the list */
RemoveEntryList(&Thread->LpcReplyChain);
InitializeListHead(&Thread->LpcReplyChain);
}
/* Release the lock */
KeReleaseGuardedMutex(&LpcpLock);
/* Check if we got a reply */
if (Status == STATUS_SUCCESS)
{
/* Check if we have a valid message */
if (Message)
{
LPCTRACE(LPC_SEND_DEBUG,
"Reply Messages: %p/%p\n",
&Message->Request,
(&Message->Request) + 1);
/* Move the message */
LpcpMoveMessage(LpcReply,
&Message->Request,
(&Message->Request) + 1,
0,
NULL);
/* Acquire the lock */
KeAcquireGuardedMutex(&LpcpLock);
/* Check if we replied to a thread */
if (Message->RepliedToThread)
{
/* Dereference */
ObDereferenceObject(Message->RepliedToThread);
Message->RepliedToThread = NULL;
}
/* Free the message */
LpcpFreeToPortZone(Message, 3);
}
else
{
/* We don't have a reply */
Status = STATUS_LPC_REPLY_LOST;
}
}
else
{
/* The wait failed, free the message */
if (Message) LpcpFreeToPortZone(Message, 0);
}
/* All done */
LPCTRACE(LPC_SEND_DEBUG,
"Port: %p. Status: %p\n",
Port,
Status);
/* Dereference the connection port */
if (ConnectionPort) ObDereferenceObject(ConnectionPort);
return Status;
}
