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reactos/subsystems/csr/csrsrv/session.c

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/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS Client/Server Runtime SubSystem
* FILE: subsystems/win32/csrsrv/session.c
* PURPOSE: CSR Server DLL Session Implementation
* PROGRAMMERS: Alex Ionescu (alex@relsoft.net)
*/
/* INCLUDES *******************************************************************/
#include "srv.h"
#define NDEBUG
#include <debug.h>
/* DATA ***********************************************************************/
RTL_CRITICAL_SECTION CsrNtSessionLock;
LIST_ENTRY CsrNtSessionList;
PSB_API_ROUTINE CsrServerSbApiDispatch[SbpMaxApiNumber - SbpCreateSession] =
{
CsrSbCreateSession,
CsrSbTerminateSession,
CsrSbForeignSessionComplete,
CsrSbCreateProcess
};
PCHAR CsrServerSbApiName[SbpMaxApiNumber - SbpCreateSession] =
{
"SbCreateSession",
"SbTerminateSession",
"SbForeignSessionComplete",
"SbCreateProcess"
};
/* PRIVATE FUNCTIONS **********************************************************/
/*++
* @name CsrInitializeNtSessionList
*
* The CsrInitializeNtSessionList routine sets up support for CSR Sessions.
*
* @param None
*
* @return None
*
* @remarks None.
*
*--*/
NTSTATUS
NTAPI
CsrInitializeNtSessionList(VOID)
{
/* Initialize the Session List */
InitializeListHead(&CsrNtSessionList);
/* Initialize the Session Lock */
return RtlInitializeCriticalSection(&CsrNtSessionLock);
}
/*++
* @name CsrAllocateNtSession
*
* The CsrAllocateNtSession routine allocates a new CSR NT Session.
*
* @param SessionId
* Session ID of the CSR NT Session to allocate.
*
* @return Pointer to the newly allocated CSR NT Session.
*
* @remarks None.
*
*--*/
PCSR_NT_SESSION
NTAPI
CsrAllocateNtSession(IN ULONG SessionId)
{
PCSR_NT_SESSION NtSession;
/* Allocate an NT Session Object */
NtSession = RtlAllocateHeap(CsrHeap, HEAP_ZERO_MEMORY, sizeof(CSR_NT_SESSION));
if (NtSession)
{
/* Setup the Session Object */
NtSession->SessionId = SessionId;
NtSession->ReferenceCount = 1;
/* Insert it into the Session List */
CsrAcquireNtSessionLock();
InsertHeadList(&CsrNtSessionList, &NtSession->SessionLink);
CsrReleaseNtSessionLock();
}
else
{
ASSERT(NtSession != NULL);
}
/* Return the Session (or NULL) */
return NtSession;
}
/*++
* @name CsrReferenceNtSession
*
* The CsrReferenceNtSession increases the reference count of a CSR NT Session.
*
* @param Session
* Pointer to the CSR NT Session to reference.
*
* @return None.
*
* @remarks None.
*
*--*/
VOID
NTAPI
CsrReferenceNtSession(IN PCSR_NT_SESSION Session)
{
/* Acquire the lock */
CsrAcquireNtSessionLock();
/* Sanity checks */
ASSERT(!IsListEmpty(&Session->SessionLink));
ASSERT(Session->SessionId != 0);
ASSERT(Session->ReferenceCount != 0);
/* Increase the reference count */
Session->ReferenceCount++;
/* Release the lock */
CsrReleaseNtSessionLock();
}
/*++
* @name CsrDereferenceNtSession
*
* The CsrDereferenceNtSession decreases the reference count of a
* CSR NT Session.
*
* @param Session
* Pointer to the CSR NT Session to reference.
*
* @param ExitStatus
* If this is the last reference to the session, this argument
* specifies the exit status.
*
* @return None.
*
* @remarks CsrDereferenceNtSession will complete the session if
* the last reference to it has been closed.
*
*--*/
VOID
NTAPI
CsrDereferenceNtSession(IN PCSR_NT_SESSION Session,
IN NTSTATUS ExitStatus)
{
/* Acquire the lock */
CsrAcquireNtSessionLock();
/* Sanity checks */
ASSERT(!IsListEmpty(&Session->SessionLink));
ASSERT(Session->SessionId != 0);
ASSERT(Session->ReferenceCount != 0);
/* Dereference the Session Object */
if ((--Session->ReferenceCount) == 0)
{
/* Remove it from the list */
RemoveEntryList(&Session->SessionLink);
/* Release the lock */
CsrReleaseNtSessionLock();
/* Tell SM that we're done here */
SmSessionComplete(CsrSmApiPort, Session->SessionId, ExitStatus);
/* Free the Session Object */
RtlFreeHeap(CsrHeap, 0, Session);
}
else
{
/* Release the lock, the Session is still active */
CsrReleaseNtSessionLock();
}
}
/* SESSION MANAGER FUNCTIONS **************************************************/
/*++
* @name CsrSbCreateSession
*
* The CsrSbCreateSession API is called by the Session Manager whenever a new
* session is created.
*
* @param ApiMessage
* Pointer to the Session Manager API Message.
*
* @return TRUE in case of success, FALSE otherwise.
*
* @remarks The CsrSbCreateSession routine will initialize a new CSR NT
* Session and allocate a new CSR Process for the subsystem process.
*
*--*/
BOOLEAN
NTAPI
CsrSbCreateSession(IN PSB_API_MSG ApiMessage)
{
PSB_CREATE_SESSION_MSG CreateSession = &ApiMessage->u.CreateSession;
HANDLE hProcess, hThread;
PCSR_PROCESS CsrProcess;
PCSR_THREAD CsrThread;
PCSR_SERVER_DLL ServerDll;
PVOID ProcessData;
NTSTATUS Status;
KERNEL_USER_TIMES KernelTimes;
ULONG i;
/* Save the Process and Thread Handles */
hProcess = CreateSession->ProcessInfo.ProcessHandle;
hThread = CreateSession->ProcessInfo.ThreadHandle;
/* Lock the Processes */
CsrAcquireProcessLock();
/* Allocate a new process */
CsrProcess = CsrAllocateProcess();
if (!CsrProcess)
{
/* Fail */
ApiMessage->ReturnValue = STATUS_NO_MEMORY;
CsrReleaseProcessLock();
return TRUE;
}
/* Set the Exception Port for us */
Status = NtSetInformationProcess(hProcess,
ProcessExceptionPort,
&CsrApiPort,
sizeof(CsrApiPort));
/* Check for success */
if (!NT_SUCCESS(Status))
{
/* Fail the request */
CsrDeallocateProcess(CsrProcess);
CsrReleaseProcessLock();
/* Strange as it seems, NTSTATUSes are actually returned */
return (BOOLEAN)STATUS_NO_MEMORY;
}
/* Get the Create Time */
Status = NtQueryInformationThread(hThread,
ThreadTimes,
&KernelTimes,
sizeof(KernelTimes),
NULL);
/* Check for success */
if (!NT_SUCCESS(Status))
{
/* Fail the request */
CsrDeallocateProcess(CsrProcess);
CsrReleaseProcessLock();
/* Strange as it seems, NTSTATUSes are actually returned */
return (BOOLEAN)Status;
}
/* Allocate a new Thread */
CsrThread = CsrAllocateThread(CsrProcess);
if (!CsrThread)
{
/* Fail the request */
CsrDeallocateProcess(CsrProcess);
CsrReleaseProcessLock();
ApiMessage->ReturnValue = STATUS_NO_MEMORY;
return TRUE;
}
/* Setup the Thread Object */
CsrThread->CreateTime = KernelTimes.CreateTime;
CsrThread->ClientId = CreateSession->ProcessInfo.ClientId;
CsrThread->ThreadHandle = hThread;
ProtectHandle(hThread);
CsrThread->Flags = 0;
/* Insert it into the Process List */
Status = CsrInsertThread(CsrProcess, CsrThread);
if (!NT_SUCCESS(Status))
{
/* Bail out */
CsrDeallocateProcess(CsrProcess);
CsrDeallocateThread(CsrThread);
CsrReleaseProcessLock();
/* Strange as it seems, NTSTATUSes are actually returned */
return (BOOLEAN)Status;
}
/* Setup Process Data */
CsrProcess->ClientId = CreateSession->ProcessInfo.ClientId;
CsrProcess->ProcessHandle = hProcess;
CsrProcess->NtSession = CsrAllocateNtSession(CreateSession->SessionId);
/* Set the Process Priority */
CsrSetBackgroundPriority(CsrProcess);
/* Get the first data location */
ProcessData = &CsrProcess->ServerData[CSR_SERVER_DLL_MAX];
/* Loop every DLL */
for (i = 0; i < CSR_SERVER_DLL_MAX; i++)
{
/* Get the current Server */
ServerDll = CsrLoadedServerDll[i];
/* Check if the DLL is loaded and has Process Data */
if (ServerDll && ServerDll->SizeOfProcessData)
{
/* Write the pointer to the data */
CsrProcess->ServerData[i] = ProcessData;
/* Move to the next data location */
ProcessData = (PVOID)((ULONG_PTR)ProcessData +
ServerDll->SizeOfProcessData);
}
else
{
/* Nothing for this Process */
CsrProcess->ServerData[i] = NULL;
}
}
/* Insert the Process */
CsrInsertProcess(NULL, CsrProcess);
/* Activate the Thread */
ApiMessage->ReturnValue = NtResumeThread(hThread, NULL);
/* Release lock and return */
CsrReleaseProcessLock();
return TRUE;
}
/*++
* @name CsrSbForeignSessionComplete
*
* The CsrSbForeignSessionComplete API is called by the Session Manager
* whenever a foreign session is completed (ie: terminated).
*
* @param ApiMessage
* Pointer to the Session Manager API Message.
*
* @return TRUE in case of success, FALSE otherwise.
*
* @remarks The CsrSbForeignSessionComplete API is not yet implemented.
*
*--*/
BOOLEAN
NTAPI
CsrSbForeignSessionComplete(IN PSB_API_MSG ApiMessage)
{
/* Deprecated/Unimplemented in NT */
ApiMessage->ReturnValue = STATUS_NOT_IMPLEMENTED;
return TRUE;
}
/*++
* @name CsrSbTerminateSession
*
* The CsrSbTerminateSession API is called by the Session Manager
* whenever a foreign session should be destroyed.
*
* @param ApiMessage
* Pointer to the Session Manager API Message.
*
* @return TRUE in case of success, FALSE otherwise.
*
* @remarks The CsrSbTerminateSession API is not yet implemented.
*
*--*/
BOOLEAN
NTAPI
CsrSbTerminateSession(IN PSB_API_MSG ApiMessage)
{
ApiMessage->ReturnValue = STATUS_NOT_IMPLEMENTED;
return TRUE;
}
/*++
* @name CsrSbCreateProcess
*
* The CsrSbCreateProcess API is called by the Session Manager
* whenever a foreign session is created and a new process should be started.
*
* @param ApiMessage
* Pointer to the Session Manager API Message.
*
* @return TRUE in case of success, FALSE otherwise.
*
* @remarks The CsrSbCreateProcess API is not yet implemented.
*
*--*/
BOOLEAN
NTAPI
CsrSbCreateProcess(IN PSB_API_MSG ApiMessage)
{
ApiMessage->ReturnValue = STATUS_NOT_IMPLEMENTED;
return TRUE;
}
/*++
* @name CsrSbApiHandleConnectionRequest
*
* The CsrSbApiHandleConnectionRequest routine handles and accepts a new
* connection request to the SM API LPC Port.
*
* @param ApiMessage
* Pointer to the incoming CSR API Message which contains the
* connection request.
*
* @return STATUS_SUCCESS in case of success, or status code which caused
* the routine to error.
*
* @remarks None.
*
*--*/
NTSTATUS
NTAPI
CsrSbApiHandleConnectionRequest(IN PSB_API_MSG Message)
{
NTSTATUS Status;
REMOTE_PORT_VIEW RemotePortView;
HANDLE hPort;
/* Set the Port View Structure Length */
RemotePortView.Length = sizeof(REMOTE_PORT_VIEW);
/* Accept the connection */
Status = NtAcceptConnectPort(&hPort,
NULL,
&Message->h,
TRUE,
NULL,
&RemotePortView);
if (!NT_SUCCESS(Status))
{
DPRINT1("CSRSS: Sb Accept Connection failed %lx\n", Status);
return Status;
}
/* Complete the Connection */
Status = NtCompleteConnectPort(hPort);
if (!NT_SUCCESS(Status))
{
DPRINT1("CSRSS: Sb Complete Connection failed %lx\n",Status);
}
/* Return status */
return Status;
}
/*++
* @name CsrSbApiRequestThread
*
* The CsrSbApiRequestThread routine handles incoming messages or connection
* requests on the SM API LPC Port.
*
* @param Parameter
* System-default user-defined parameter. Unused.
*
* @return The thread exit code, if the thread is terminated.
*
* @remarks Before listening on the port, the routine will first attempt
* to connect to the user subsystem.
*
*--*/
VOID
NTAPI
CsrSbApiRequestThread(IN PVOID Parameter)
{
NTSTATUS Status;
SB_API_MSG ReceiveMsg;
PSB_API_MSG ReplyMsg = NULL;
PVOID PortContext;
ULONG MessageType;
/* Start the loop */
while (TRUE)
{
/* Wait for a message to come in */
Status = NtReplyWaitReceivePort(CsrSbApiPort,
&PortContext,
&ReplyMsg->h,
&ReceiveMsg.h);
/* Check if we didn't get success */
if (Status != STATUS_SUCCESS)
{
/* If we only got a warning, keep going */
if (NT_SUCCESS(Status)) continue;
/* We failed big time, so start out fresh */
ReplyMsg = NULL;
DPRINT1("CSRSS: ReceivePort failed - Status == %X\n", Status);
continue;
}
/* Save the message type */
MessageType = ReceiveMsg.h.u2.s2.Type;
/* Check if this is a connection request */
if (MessageType == LPC_CONNECTION_REQUEST)
{
/* Handle connection request */
CsrSbApiHandleConnectionRequest(&ReceiveMsg);
/* Start over */
ReplyMsg = NULL;
continue;
}
/* Check if the port died */
if (MessageType == LPC_PORT_CLOSED)
{
/* Close the handle if we have one */
if (PortContext) NtClose((HANDLE)PortContext);
/* Client died, start over */
ReplyMsg = NULL;
continue;
}
else if (MessageType == LPC_CLIENT_DIED)
{
/* Client died, start over */
ReplyMsg = NULL;
continue;
}
/*
* It's an API Message, check if it's within limits. If it's not,
* the NT Behaviour is to set this to the Maximum API.
*/
if (ReceiveMsg.ApiNumber > SbpMaxApiNumber)
{
ReceiveMsg.ApiNumber = SbpMaxApiNumber;
DPRINT1("CSRSS: %lx is invalid Sb ApiNumber\n", ReceiveMsg.ApiNumber);
}
/* Reuse the message */
ReplyMsg = &ReceiveMsg;
/* Make sure that the message is supported */
if (ReceiveMsg.ApiNumber < SbpMaxApiNumber)
{
/* Call the API */
if (!CsrServerSbApiDispatch[ReceiveMsg.ApiNumber](&ReceiveMsg))
{
DPRINT1("CSRSS: %s Session Api called and failed\n",
CsrServerSbApiName[ReceiveMsg.ApiNumber]);
/* It failed, so return nothing */
ReplyMsg = NULL;
}
}
else
{
/* We don't support this API Number */
ReplyMsg->ReturnValue = STATUS_NOT_IMPLEMENTED;
}
}
}
/* EOF */
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