ChangeIdent.c
Author: cmaier@cmassoc.net

    /*====================================================================*
     *
     *   Copyright (c) 2013 Qualcomm Atheros, Inc.
     *
     *   All rights reserved.
     *
     *   Redistribution and use in source and binary forms, with or
     *   without modification, are permitted (subject to the limitations
     *   in the disclaimer below) provided that the following conditions
     *   are met:
     *
     *   * Redistributions of source code must retain the above copyright
     *     notice, this list of conditions and the following disclaimer.
     *
     *   * Redistributions in binary form must reproduce the above
     *     copyright notice, this list of conditions and the following
     *     disclaimer in the documentation and/or other materials
     *     provided with the distribution.
     *
     *   * Neither the name of Qualcomm Atheros nor the names of
     *     its contributors may be used to endorse or promote products
     *     derived from this software without specific prior written
     *     permission.
     *
     *   NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE
     *   GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE
     *   COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
     *   IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     *   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     *   PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
     *   OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     *   NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     *   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     *   HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     *   CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
     *   OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     *   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     *--------------------------------------------------------------------*/

    /*====================================================================*
     *
     *   signed ChangeIdent (struct plc * plc);
     *
     *   plc.h
     *
     *   read PIB file header; replace MAC, DAK and NMK; update preferred
     *   NID; re-write PIB file header and PIB file checksum; use the MAC,
     *   DAK and NMK values stored in struct plc;
     *
     *
     *   Contributor(s):
     *      Charles Maier <cmaier@qca.qualcomm.com>
     *
     *--------------------------------------------------------------------*/

    #ifndef CHANGEIDENT_SOURCE
    #define CHANGEIDENT_SOURCE

    #include <unistd.h>
    #include <stdint.h>

    #include "../plc/plc.h"
    #include "../tools/error.h"
    #include "../tools/files.h"
    #include "../key/HPAVKey.h"
    #include "../pib/pib.h"

    signed ChangeIdent (struct plc * plc)

    {
    	struct simple_pib simple_pib;
    	memset (&simple_pib, 0, sizeof (simple_pib));
    	if (lseek (plc->PIB.file, 0, SEEK_SET))
    	{
    		error (1, errno, FILE_CANTHOME, plc->PIB.name);
    	}
    	if (read (plc->PIB.file, &simple_pib, sizeof (simple_pib)) != sizeof (simple_pib))
    	{
    		error (1, errno, FILE_CANTREAD, plc->PIB.name);
    	}
    	memcpy (simple_pib.MAC, plc->MAC, sizeof (simple_pib.MAC));
    	memcpy (simple_pib.DAK, plc->DAK, sizeof (simple_pib.DAK));
    	memcpy (simple_pib.NMK, plc->NMK, sizeof (simple_pib.NMK));
    	{
    		uint8_t level = simple_pib.PreferredNID [HPAVKEY_NID_LEN-1] >> 4;
    		HPAVKeyNID (simple_pib.PreferredNID, simple_pib.NMK, level & 1);
    	}
    	simple_pib.CHECKSUM = 0;
    	if (lseek (plc->PIB.file, 0, SEEK_SET))
    	{
    		error (1, errno, FILE_CANTHOME, plc->PIB.name);
    	}
    	if (write (plc->PIB.file, &simple_pib, sizeof (simple_pib)) != sizeof (simple_pib))
    	{
    		error (1, errno, FILE_CANTSAVE, plc->PIB.name);
    	}
    	if (lseek (plc->PIB.file, 0, SEEK_SET))
    	{
    		error (1, errno, FILE_CANTHOME, plc->PIB.name);
    	}
    	simple_pib.CHECKSUM = fdchecksum32 (plc->PIB.file, LE16TOH (simple_pib.PIBLENGTH), 0);
    	if (lseek (plc->PIB.file, 0, SEEK_SET))
    	{
    		error (1, errno, FILE_CANTHOME, plc->PIB.name);
    	}
    	if (write (plc->PIB.file, &simple_pib, sizeof (simple_pib)) != sizeof (simple_pib))
    	{
    		error (1, errno, FILE_CANTSAVE, plc->PIB.name);
    	}
    	return (0);
    }

    #endif

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