/* Editor Settings: expandtabs and use 4 spaces for indentation
 * ex: set softtabstop=4 tabstop=8 expandtab shiftwidth=4: *
 */

/*
 * Copyright Likewise Software
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.  You should have received a copy of the GNU General
 * Public License along with this program.  If not, see
 * <http://www.gnu.org/licenses/>.
 *
 * LIKEWISE SOFTWARE MAKES THIS SOFTWARE AVAILABLE UNDER OTHER LICENSING
 * TERMS AS WELL.  IF YOU HAVE ENTERED INTO A SEPARATE LICENSE AGREEMENT
 * WITH LIKEWISE SOFTWARE, THEN YOU MAY ELECT TO USE THE SOFTWARE UNDER THE
 * TERMS OF THAT SOFTWARE LICENSE AGREEMENT INSTEAD OF THE TERMS OF THE GNU
 * GENERAL PUBLIC LICENSE, NOTWITHSTANDING THE ABOVE NOTICE.  IF YOU
 * HAVE QUESTIONS, OR WISH TO REQUEST A COPY OF THE ALTERNATE LICENSING
 * TERMS OFFERED BY LIKEWISE SOFTWARE, PLEASE CONTACT LIKEWISE SOFTWARE AT
 * license@likewisesoftware.com
 */

/*
 * Copyright (C) Likewise Software. All rights reserved.
 *
 * Module Name:
 *
 *        echo.c
 *
 * Abstract:
 *
 *        Likewise IO (LWIO) - SRV
 *
 *        Protocols API - SMBV2
 *
 *        Echo (Keepalive)
 *
 * Authors: Krishna Ganugapati (kganugapati@likewise.com)
 *          Sriram Nambakam (snambakam@likewise.com)
 *
 *
 */

#include "includes.h"

NTSTATUS
SrvProcessEcho_SMB_V2(
    PSRV_EXEC_CONTEXT pExecContext
    )
{
    NTSTATUS                   ntStatus      = STATUS_SUCCESS;
    PSRV_PROTOCOL_EXEC_CONTEXT pCtxProtocol  = pExecContext->pProtocolContext;
    PSRV_EXEC_CONTEXT_SMB_V2   pCtxSmb2      = pCtxProtocol->pSmb2Context;
    ULONG                      iMsg          = pCtxSmb2->iMsg;
    PSRV_MESSAGE_SMB_V2        pSmbRequest   = &pCtxSmb2->pRequests[iMsg];
    PSRV_MESSAGE_SMB_V2        pSmbResponse  = &pCtxSmb2->pResponses[iMsg];
    PBYTE pOutBuffer       = pSmbResponse->pBuffer;
    ULONG ulBytesAvailable = pSmbResponse->ulBytesAvailable;
    ULONG ulOffset         = 0;
    ULONG ulBytesUsed      = 0;
    ULONG ulTotalBytesUsed = 0;
    PSMB2_ECHO_REQUEST_HEADER pRequestHeader = NULL; // Do not free

    ntStatus = SMB2UnmarshalEchoRequest(pSmbRequest, &pRequestHeader);
    BAIL_ON_NT_STATUS(ntStatus);

    ntStatus = SMB2MarshalHeader(
                    pOutBuffer,
                    ulOffset,
                    ulBytesAvailable,
                    COM2_ECHO,
                    pSmbRequest->pHeader->usEpoch,
                    pSmbRequest->pHeader->usCredits,
                    pSmbRequest->pHeader->ulPid,
                    pSmbRequest->pHeader->ullCommandSequence,
                    pSmbRequest->pHeader->ulTid,
                    pSmbRequest->pHeader->ullSessionId,
                    0LL, /* Async Id */
                    STATUS_SUCCESS,
                    TRUE,
                    LwIsSetFlag(
                            pSmbRequest->pHeader->ulFlags,
                            SMB2_FLAGS_RELATED_OPERATION),
                    &pSmbResponse->pHeader,
                    &pSmbResponse->ulHeaderSize);
    BAIL_ON_NT_STATUS(ntStatus);

    pOutBuffer       += pSmbResponse->ulHeaderSize;
    ulOffset         += pSmbResponse->ulHeaderSize;
    ulBytesAvailable -= pSmbResponse->ulHeaderSize;
    ulTotalBytesUsed += pSmbResponse->ulHeaderSize;

    ntStatus = SMB2MarshalEchoResponse(
                    pOutBuffer,
                    ulOffset,
                    ulBytesAvailable,
                    &ulBytesUsed);
    BAIL_ON_NT_STATUS(ntStatus);

    // pOutBuffer += ulBytesUsed;
    // ulOffset += ulBytesUsed;
    // ulBytesAvailable -= ulBytesUsed;
    ulTotalBytesUsed += ulBytesUsed;

    pSmbResponse->ulMessageSize = ulTotalBytesUsed;

cleanup:

    return ntStatus;

error:

    if (ulTotalBytesUsed)
    {
        pSmbResponse->pHeader = NULL;
        pSmbResponse->ulHeaderSize = 0;
        memset(pSmbResponse->pBuffer, 0, ulTotalBytesUsed);
    }

    pSmbResponse->ulMessageSize = 0;

    goto cleanup;
}