reactos/ntoskrnl/lpc/complete.c

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/*
* PROJECT: ReactOS Kernel
* LICENSE: GPL - See COPYING in the top level directory
* FILE: ntoskrnl/lpc/complete.c
* PURPOSE: Local Procedure Call: Connection Completion
* PROGRAMMERS: Alex Ionescu (alex.ionescu@reactos.org)
*/
/* INCLUDES ******************************************************************/
#include <ntoskrnl.h>
#define NDEBUG
#include <debug.h>
/* PRIVATE FUNCTIONS *********************************************************/
VOID
NTAPI
LpcpPrepareToWakeClient(IN PETHREAD Thread)
{
PAGED_CODE();
/* Make sure the thread isn't dying and it has a valid chain */
if (!(Thread->LpcExitThreadCalled) &&
!(IsListEmpty(&Thread->LpcReplyChain)))
{
/* Remove it from the list and reinitialize it */
RemoveEntryList(&Thread->LpcReplyChain);
InitializeListHead(&Thread->LpcReplyChain);
}
}
/* PUBLIC FUNCTIONS **********************************************************/
/*
* @implemented
*/
NTSTATUS
NTAPI
NtAcceptConnectPort(OUT PHANDLE PortHandle,
IN PVOID PortContext OPTIONAL,
IN PPORT_MESSAGE ReplyMessage,
IN BOOLEAN AcceptConnection,
IN OUT PPORT_VIEW ServerView OPTIONAL,
OUT PREMOTE_PORT_VIEW ClientView OPTIONAL)
{
NTSTATUS Status;
KPROCESSOR_MODE PreviousMode = KeGetPreviousMode();
PORT_VIEW CapturedServerView;
PORT_MESSAGE CapturedReplyMessage;
ULONG ConnectionInfoLength;
PLPCP_PORT_OBJECT ConnectionPort, ServerPort, ClientPort;
PLPCP_CONNECTION_MESSAGE ConnectMessage;
PLPCP_MESSAGE Message;
PVOID ClientSectionToMap = NULL;
HANDLE Handle;
PEPROCESS ClientProcess;
PETHREAD ClientThread;
LARGE_INTEGER SectionOffset;
PAGED_CODE();
LPCTRACE(LPC_COMPLETE_DEBUG,
"Context: %p. Message: %p. Accept: %lx. Views: %p/%p\n",
PortContext,
ReplyMessage,
AcceptConnection,
ClientView,
ServerView);
/* Check if the call comes from user mode */
if (PreviousMode != KernelMode)
{
_SEH2_TRY
{
/* Probe the PortHandle */
ProbeForWriteHandle(PortHandle);
/* Probe the basic ReplyMessage structure */
ProbeForRead(ReplyMessage, sizeof(*ReplyMessage), sizeof(ULONG));
CapturedReplyMessage = *(volatile PORT_MESSAGE*)ReplyMessage;
ConnectionInfoLength = CapturedReplyMessage.u1.s1.DataLength;
/* Probe the connection info */
ProbeForRead(ReplyMessage + 1, ConnectionInfoLength, 1);
/* The following parameters are optional */
/* Capture the server view */
if (ServerView)
{
ProbeForWrite(ServerView, sizeof(*ServerView), sizeof(ULONG));
CapturedServerView = *(volatile PORT_VIEW*)ServerView;
/* Validate the size of the server view */
if (CapturedServerView.Length != sizeof(CapturedServerView))
{
/* Invalid size */
_SEH2_YIELD(return STATUS_INVALID_PARAMETER);
}
}
/* Capture the client view */
if (ClientView)
{
ProbeForWrite(ClientView, sizeof(*ClientView), sizeof(ULONG));
/* Validate the size of the client view */
if (((volatile REMOTE_PORT_VIEW*)ClientView)->Length != sizeof(*ClientView))
{
/* Invalid size */
_SEH2_YIELD(return STATUS_INVALID_PARAMETER);
}
}
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
/* There was an exception, return the exception code */
_SEH2_YIELD(return _SEH2_GetExceptionCode());
}
_SEH2_END;
}
else
{
CapturedReplyMessage = *ReplyMessage;
ConnectionInfoLength = CapturedReplyMessage.u1.s1.DataLength;
/* Capture the server view */
if (ServerView)
{
/* Validate the size of the server view */
if (ServerView->Length != sizeof(*ServerView))
{
/* Invalid size */
return STATUS_INVALID_PARAMETER;
}
CapturedServerView = *ServerView;
}
/* Capture the client view */
if (ClientView)
{
/* Validate the size of the client view */
if (ClientView->Length != sizeof(*ClientView))
{
/* Invalid size */
return STATUS_INVALID_PARAMETER;
}
}
}
/* Get the client process and thread */
Status = PsLookupProcessThreadByCid(&CapturedReplyMessage.ClientId,
&ClientProcess,
&ClientThread);
if (!NT_SUCCESS(Status)) return Status;
/* Acquire the LPC Lock */
KeAcquireGuardedMutex(&LpcpLock);
/* Make sure that the client wants a reply, and this is the right one */
if (!(LpcpGetMessageFromThread(ClientThread)) ||
!(CapturedReplyMessage.MessageId) ||
(ClientThread->LpcReplyMessageId != CapturedReplyMessage.MessageId))
{
/* Not the reply asked for, or no reply wanted, fail */
KeReleaseGuardedMutex(&LpcpLock);
ObDereferenceObject(ClientProcess);
ObDereferenceObject(ClientThread);
return STATUS_REPLY_MESSAGE_MISMATCH;
}
/* Now get the message and connection message */
Message = LpcpGetMessageFromThread(ClientThread);
ConnectMessage = (PLPCP_CONNECTION_MESSAGE)(Message + 1);
/* Get the client and connection port as well */
ClientPort = ConnectMessage->ClientPort;
ConnectionPort = ClientPort->ConnectionPort;
/* Make sure that the reply is being sent to the proper server process */
if (ConnectionPort->ServerProcess != PsGetCurrentProcess())
{
/* It's not, so fail */
KeReleaseGuardedMutex(&LpcpLock);
ObDereferenceObject(ClientProcess);
ObDereferenceObject(ClientThread);
return STATUS_REPLY_MESSAGE_MISMATCH;
}
/* At this point, don't let other accept attempts happen */
ClientThread->LpcReplyMessage = NULL;
ClientThread->LpcReplyMessageId = 0;
/* Clear the client port for now as well, then release the lock */
ConnectMessage->ClientPort = NULL;
KeReleaseGuardedMutex(&LpcpLock);
/* Check the connection information length */
if (ConnectionInfoLength > ConnectionPort->MaxConnectionInfoLength)
{
/* Normalize it since it's too large */
ConnectionInfoLength = ConnectionPort->MaxConnectionInfoLength;
}
/* Set the sizes of our reply message */
Message->Request.u1.s1.DataLength = (CSHORT)ConnectionInfoLength +
sizeof(LPCP_CONNECTION_MESSAGE);
Message->Request.u1.s1.TotalLength = sizeof(LPCP_MESSAGE) +
Message->Request.u1.s1.DataLength;
/* Setup the reply message */
Message->Request.u2.s2.Type = LPC_REPLY;
Message->Request.u2.s2.DataInfoOffset = 0;
Message->Request.ClientId = CapturedReplyMessage.ClientId;
Message->Request.MessageId = CapturedReplyMessage.MessageId;
Message->Request.ClientViewSize = 0;
_SEH2_TRY
{
RtlCopyMemory(ConnectMessage + 1, ReplyMessage + 1, ConnectionInfoLength);
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
Status = _SEH2_GetExceptionCode();
_SEH2_YIELD(goto Cleanup);
}
_SEH2_END;
/* At this point, if the caller refused the connection, go to cleanup */
if (!AcceptConnection)
{
DPRINT1("LPC connection was refused\n");
goto Cleanup;
}
/* Otherwise, create the actual port */
Status = ObCreateObject(PreviousMode,
LpcPortObjectType,
NULL,
PreviousMode,
NULL,
sizeof(LPCP_PORT_OBJECT),
0,
0,
(PVOID*)&ServerPort);
if (!NT_SUCCESS(Status)) goto Cleanup;
/* Set it up */
RtlZeroMemory(ServerPort, sizeof(LPCP_PORT_OBJECT));
ServerPort->PortContext = PortContext;
ServerPort->Flags = LPCP_COMMUNICATION_PORT;
ServerPort->MaxMessageLength = ConnectionPort->MaxMessageLength;
InitializeListHead(&ServerPort->LpcReplyChainHead);
InitializeListHead(&ServerPort->LpcDataInfoChainHead);
/* Reference the connection port until we're fully setup */
ObReferenceObject(ConnectionPort);
/* Link the ports together */
ServerPort->ConnectionPort = ConnectionPort;
ServerPort->ConnectedPort = ClientPort;
ClientPort->ConnectedPort = ServerPort;
/* Also set the creator CID */
ServerPort->Creator = PsGetCurrentThread()->Cid;
ClientPort->Creator = Message->Request.ClientId;
/* Get the section associated and then clear it, while inside the lock */
KeAcquireGuardedMutex(&LpcpLock);
ClientSectionToMap = ConnectMessage->SectionToMap;
ConnectMessage->SectionToMap = NULL;
KeReleaseGuardedMutex(&LpcpLock);
/* Now check if there's a client section */
if (ClientSectionToMap)
{
/* Setup the offset */
SectionOffset.QuadPart = ConnectMessage->ClientView.SectionOffset;
/* Map the section */
Status = MmMapViewOfSection(ClientSectionToMap,
PsGetCurrentProcess(),
&ServerPort->ClientSectionBase,
0,
0,
&SectionOffset,
&ConnectMessage->ClientView.ViewSize,
ViewUnmap,
0,
PAGE_READWRITE);
/* Update the offset and check for mapping status */
ConnectMessage->ClientView.SectionOffset = SectionOffset.LowPart;
if (NT_SUCCESS(Status))
{
/* Set the view base */
ConnectMessage->ClientView.ViewRemoteBase = ServerPort->
ClientSectionBase;
/* Save and reference the mapping process */
ServerPort->MappingProcess = PsGetCurrentProcess();
ObReferenceObject(ServerPort->MappingProcess);
}
else
{
/* Otherwise, quit */
ObDereferenceObject(ServerPort);
DPRINT1("Client section mapping failed: %lx\n", Status);
LPCTRACE(LPC_COMPLETE_DEBUG,
"View base, offset, size: %p %lx %p\n",
ServerPort->ClientSectionBase,
ConnectMessage->ClientView.ViewSize,
SectionOffset);
goto Cleanup;
}
}
/* Check if there's a server section */
if (ServerView)
{
/* FIXME: TODO */
UNREFERENCED_PARAMETER(CapturedServerView);
ASSERT(FALSE);
}
/* Reference the server port until it's fully inserted */
ObReferenceObject(ServerPort);
/* Insert the server port in the namespace */
Status = ObInsertObject(ServerPort,
NULL,
PORT_ALL_ACCESS,
0,
NULL,
&Handle);
if (!NT_SUCCESS(Status))
{
/* We failed, remove the extra reference and cleanup */
ObDereferenceObject(ServerPort);
goto Cleanup;
}
/* Enter SEH to write back the results */
_SEH2_TRY
{
/* Check if the caller gave a client view */
if (ClientView)
{
/* Fill it out */
ClientView->ViewBase = ConnectMessage->ClientView.ViewRemoteBase;
ClientView->ViewSize = ConnectMessage->ClientView.ViewSize;
}
/* Return the handle to user mode */
*PortHandle = Handle;
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
/* Cleanup and return the exception code */
ObCloseHandle(Handle, PreviousMode);
ObDereferenceObject(ServerPort);
Status = _SEH2_GetExceptionCode();
_SEH2_YIELD(goto Cleanup);
}
_SEH2_END;
LPCTRACE(LPC_COMPLETE_DEBUG,
"Handle: %p. Messages: %p/%p. Ports: %p/%p/%p\n",
Handle,
Message,
ConnectMessage,
ServerPort,
ClientPort,
ConnectionPort);
/* If there was no port context, use the handle by default */
if (!PortContext) ServerPort->PortContext = Handle;
ServerPort->ClientThread = ClientThread;
/* Set this message as the LPC Reply message while holding the lock */
KeAcquireGuardedMutex(&LpcpLock);
ClientThread->LpcReplyMessage = Message;
KeReleaseGuardedMutex(&LpcpLock);
/* Clear the thread pointer so it doesn't get cleaned later */
ClientThread = NULL;
/* Remove the extra reference we had added */
ObDereferenceObject(ServerPort);
Cleanup:
/* If there was a section, dereference it */
if (ClientSectionToMap) ObDereferenceObject(ClientSectionToMap);
/* Check if we got here while still having a client thread */
if (ClientThread)
{
KeAcquireGuardedMutex(&LpcpLock);
ClientThread->LpcReplyMessage = Message;
LpcpPrepareToWakeClient(ClientThread);
KeReleaseGuardedMutex(&LpcpLock);
LpcpCompleteWait(&ClientThread->LpcReplySemaphore);
ObDereferenceObject(ClientThread);
}
/* Dereference the client port if we have one, and the process */
LPCTRACE(LPC_COMPLETE_DEBUG,
"Status: %lx. Thread: %p. Process: [%.16s]\n",
Status,
ClientThread,
ClientProcess->ImageFileName);
if (ClientPort) ObDereferenceObject(ClientPort);
ObDereferenceObject(ClientProcess);
return Status;
}
/*
* @implemented
*/
NTSTATUS
NTAPI
NtCompleteConnectPort(IN HANDLE PortHandle)
{
NTSTATUS Status;
KPROCESSOR_MODE PreviousMode = KeGetPreviousMode();
PLPCP_PORT_OBJECT Port;
PETHREAD Thread;
PAGED_CODE();
LPCTRACE(LPC_COMPLETE_DEBUG, "Handle: %p\n", PortHandle);
/* Get the Port Object */
Status = ObReferenceObjectByHandle(PortHandle,
PORT_ALL_ACCESS,
LpcPortObjectType,
PreviousMode,
(PVOID*)&Port,
NULL);
if (!NT_SUCCESS(Status)) return Status;
/* Make sure this is a connection port */
if ((Port->Flags & LPCP_PORT_TYPE_MASK) != LPCP_COMMUNICATION_PORT)
{
/* It isn't, fail */
ObDereferenceObject(Port);
return STATUS_INVALID_PORT_HANDLE;
}
/* Acquire the lock */
KeAcquireGuardedMutex(&LpcpLock);
/* Make sure we have a client thread */
if (!Port->ClientThread)
{
/* We don't, fail */
KeReleaseGuardedMutex(&LpcpLock);
ObDereferenceObject(Port);
return STATUS_INVALID_PARAMETER;
}
/* Get the thread */
Thread = Port->ClientThread;
/* Make sure it has a reply message */
if (!LpcpGetMessageFromThread(Thread))
{
/* It doesn't, quit */
KeReleaseGuardedMutex(&LpcpLock);
ObDereferenceObject(Port);
return STATUS_SUCCESS;
}
/* Clear the client thread and wake it up */
Port->ClientThread = NULL;
LpcpPrepareToWakeClient(Thread);
/* Release the lock and wait for an answer */
KeReleaseGuardedMutex(&LpcpLock);
LpcpCompleteWait(&Thread->LpcReplySemaphore);
/* Dereference the Thread and Port and return */
ObDereferenceObject(Port);
ObDereferenceObject(Thread);
LPCTRACE(LPC_COMPLETE_DEBUG, "Port: %p. Thread: %p\n", Port, Thread);
return Status;
}
/* EOF */