app_db.c 22.7 KB
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/*************************************************************************************************/
/*!
 *  \file
 *
 *  \brief  Application framework device database example, using simple RAM-based storage.
 *
 *  Copyright (c) 2011-2018 Arm Ltd. All Rights Reserved.
 *  ARM Ltd. confidential and proprietary.
 *
 *  IMPORTANT.  Your use of this file is governed by a Software License Agreement
 *  ("Agreement") that must be accepted in order to download or otherwise receive a
 *  copy of this file.  You may not use or copy this file for any purpose other than
 *  as described in the Agreement.  If you do not agree to all of the terms of the
 *  Agreement do not use this file and delete all copies in your possession or control;
 *  if you do not have a copy of the Agreement, you must contact ARM Ltd. prior
 *  to any use, copying or further distribution of this software.
 */
/*************************************************************************************************/

/* card10:
 * copied from: lib/sdk/Libraries/BTLE/stack/ble-profiles/sources/apps/app/common/app_db.c
 *
 * Reason: we need to implement persistent storage for pairings
 */
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/* clang-format off */
/* clang-formet turned off for easier diffing against orginal file */
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#include "wsf_types.h"
#include "wsf_assert.h"
#include "util/bda.h"
#include "app_api.h"
#include "app_main.h"
#include "app_db.h"
#include "app_cfg.h"

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#include "epicardium.h"
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#include "modules/log.h"
#include "FreeRTOS.h"
#include "timers.h"
#include "mxc_sys.h"
#include "wdt.h"
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#include <string.h>
#include <stdio.h>

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/**************************************************************************************************
  Data Types
**************************************************************************************************/

/*! Database record */
typedef struct
{
  /*! Common for all roles */
  bdAddr_t    peerAddr;                     /*! Peer address */
  uint8_t     addrType;                     /*! Peer address type */
  dmSecIrk_t  peerIrk;                      /*! Peer IRK */
  dmSecCsrk_t peerCsrk;                     /*! Peer CSRK */
  uint8_t     keyValidMask;                 /*! Valid keys in this record */
  bool_t      inUse;                        /*! TRUE if record in use */
  bool_t      valid;                        /*! TRUE if record is valid */
  bool_t      peerAddedToRl;                /*! TRUE if peer device's been added to resolving list */
  bool_t      peerRpao;                     /*! TRUE if RPA Only attribute's present on peer device */

  /*! For slave local device */
  dmSecLtk_t  localLtk;                     /*! Local LTK */
  uint8_t     localLtkSecLevel;             /*! Local LTK security level */
  bool_t      peerAddrRes;                  /*! TRUE if address resolution's supported on peer device (master) */

  /*! For master local device */
  dmSecLtk_t  peerLtk;                      /*! Peer LTK */
  uint8_t     peerLtkSecLevel;              /*! Peer LTK security level */

  /*! for ATT server local device */
  uint16_t    cccTbl[APP_DB_NUM_CCCD];      /*! Client characteristic configuration descriptors */
  uint32_t    peerSignCounter;              /*! Peer Sign Counter */

  /*! for ATT client */
  uint16_t    hdlList[APP_DB_HDL_LIST_LEN]; /*! Cached handle list */
  uint8_t     discStatus;                   /*! Service discovery and configuration status */
} appDbRec_t;

/*! Database type */
typedef struct
{
  appDbRec_t  rec[APP_DB_NUM_RECS];               /*! Device database records */
  char        devName[ATT_DEFAULT_PAYLOAD_LEN];   /*! Device name */
  uint8_t     devNameLen;                         /*! Device name length */
} appDb_t;

/**************************************************************************************************
  Local Variables
**************************************************************************************************/

/*! Database */
static appDb_t appDb;

/*! When all records are allocated use this index to determine which to overwrite */
static appDbRec_t *pAppDbNewRec = appDb.rec;

/*************************************************************************************************/
/*!
 *  \brief  Initialize the device database.
 *
 *  \return None.
 */
/*************************************************************************************************/
void AppDbInit(void)
{
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  int fd = epic_file_open("pairings.bin", "r");

  if(fd >= 0) {
    if(epic_file_read(fd, &appDb, sizeof(appDb)) != sizeof(appDb)) {
        memset(&appDb, 0, sizeof(appDb));
    }
    epic_file_close(fd);
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  }
}

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static void AppDbStore(void)
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{
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  LOG_INFO("appDb", "writing to persistent storage");
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  int fd = epic_file_open("pairings.bin", "w");
  if(fd >= 0) {
    if(epic_file_write(fd, &appDb, sizeof(appDb)) != sizeof(appDb)) {
    }
    epic_file_close(fd);
  }
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}

/*************************************************************************************************/
/*!
 *  \brief  Create a new device database record.
 *
 *  \param  addrType  Address type.
 *  \param  pAddr     Peer device address.
 *
 *  \return Database record handle.
 */
/*************************************************************************************************/
appDbHdl_t AppDbNewRecord(uint8_t addrType, uint8_t *pAddr)
{
  appDbRec_t  *pRec = appDb.rec;
  uint8_t     i;

  /* find a free record */
  for (i = APP_DB_NUM_RECS; i > 0; i--, pRec++)
  {
    if (!pRec->inUse)
    {
      break;
    }
  }

  /* if all records were allocated */
  if (i == 0)
  {
    /* overwrite a record */
    pRec = pAppDbNewRec;

    /* get next record to overwrite */
    pAppDbNewRec++;
    if (pAppDbNewRec == &appDb.rec[APP_DB_NUM_RECS])
    {
      pAppDbNewRec = appDb.rec;
    }
  }

  /* initialize record */
  memset(pRec, 0, sizeof(appDbRec_t));
  pRec->inUse = TRUE;
  pRec->addrType = addrType;
  BdaCpy(pRec->peerAddr, pAddr);
  pRec->peerAddedToRl = FALSE;
  pRec->peerRpao = FALSE;

  return (appDbHdl_t) pRec;
}

/*************************************************************************************************/
/*!
*  \brief  Get the next database record for a given record. For the first record, the function
*          should be called with 'hdl' set to 'APP_DB_HDL_NONE'.
*
*  \param  hdl  Database record handle.
*
*  \return Next record handle found. APP_DB_HDL_NONE, otherwise.
*/
/*************************************************************************************************/
appDbHdl_t AppDbGetNextRecord(appDbHdl_t hdl)
{
  appDbRec_t  *pRec;

  /* if first record is requested */
  if (hdl == APP_DB_HDL_NONE)
  {
    pRec = appDb.rec;
  }
  /* if valid record passed in */
  else if (AppDbRecordInUse(hdl))
  {
    pRec = (appDbRec_t *)hdl;
    pRec++;
  }
  /* invalid record passed in */
  else
  {
    return APP_DB_HDL_NONE;
  }

  /* look for next valid record */
  while (pRec < &appDb.rec[APP_DB_NUM_RECS])
  {
    /* if record is in use */
    if (pRec->inUse && pRec->valid)
    {
      /* record found */
      return (appDbHdl_t)pRec;
    }

    /* look for next record */
    pRec++;
  }

  /* end of records */
  return APP_DB_HDL_NONE;
}

/*************************************************************************************************/
/*!
 *  \brief  Delete a new device database record.
 *
 *  \param  hdl       Database record handle.
 *
 *  \return None.
 */
/*************************************************************************************************/
void AppDbDeleteRecord(appDbHdl_t hdl)
{
  ((appDbRec_t *) hdl)->inUse = FALSE;
}

/*************************************************************************************************/
/*!
 *  \brief  Validate a new device database record.  This function is called when pairing is
 *          successful and the devices are bonded.
 *
 *  \param  hdl       Database record handle.
 *  \param  keyMask   Bitmask of keys to validate.
 *
 *  \return None.
 */
/*************************************************************************************************/
void AppDbValidateRecord(appDbHdl_t hdl, uint8_t keyMask)
{
  ((appDbRec_t *) hdl)->valid = TRUE;
  ((appDbRec_t *) hdl)->keyValidMask = keyMask;
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  AppDbStore();
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}

/*************************************************************************************************/
/*!
 *  \brief  Check if a record has been validated.  If it has not, delete it.  This function
 *          is typically called when the connection is closed.
 *
 *  \param  hdl       Database record handle.
 *
 *  \return None.
 */
/*************************************************************************************************/
void AppDbCheckValidRecord(appDbHdl_t hdl)
{
  if (((appDbRec_t *) hdl)->valid == FALSE)
  {
    AppDbDeleteRecord(hdl);
  }
}

/*************************************************************************************************/
/*!
*  \brief  Check if a database record is in use.

*  \param  hdl       Database record handle.
*
*  \return TURE if record in use. FALSE, otherwise.
*/
/*************************************************************************************************/
bool_t AppDbRecordInUse(appDbHdl_t hdl)
{
  appDbRec_t  *pRec = appDb.rec;
  uint8_t     i;

  /* see if record is in database record list */
  for (i = APP_DB_NUM_RECS; i > 0; i--, pRec++)
  {
    if (pRec->inUse && pRec->valid && (pRec == ((appDbRec_t *)hdl)))
    {
      return TRUE;
    }
  }

  return FALSE;
}

/*************************************************************************************************/
/*!
 *  \brief  Check if there is a stored bond with any device.
 *
 *  \param  hdl       Database record handle.
 *
 *  \return TRUE if a bonded device is found, FALSE otherwise.
 */
/*************************************************************************************************/
bool_t AppDbCheckBonded(void)
{
  appDbRec_t  *pRec = appDb.rec;
  uint8_t     i;

  /* find a record */
  for (i = APP_DB_NUM_RECS; i > 0; i--, pRec++)
  {
    if (pRec->inUse)
    {
      return TRUE;
    }
  }

  return FALSE;
}

/*************************************************************************************************/
/*!
 *  \brief  Delete all database records.
 *
 *  \return None.
 */
/*************************************************************************************************/
void AppDbDeleteAllRecords(void)
{
  appDbRec_t  *pRec = appDb.rec;
  uint8_t     i;

  /* set in use to false for all records */
  for (i = APP_DB_NUM_RECS; i > 0; i--, pRec++)
  {
    pRec->inUse = FALSE;
  }
}

/*************************************************************************************************/
/*!
 *  \brief  Find a device database record by peer address.
 *
 *  \param  addrType  Address type.
 *  \param  pAddr     Peer device address.
 *
 *  \return Database record handle or APP_DB_HDL_NONE if not found.
 */
/*************************************************************************************************/
appDbHdl_t AppDbFindByAddr(uint8_t addrType, uint8_t *pAddr)
{
  appDbRec_t  *pRec = appDb.rec;
  uint8_t     peerAddrType = DmHostAddrType(addrType);
  uint8_t     i;

  /* find matching record */
  for (i = APP_DB_NUM_RECS; i > 0; i--, pRec++)
  {
    if (pRec->inUse && (pRec->addrType == peerAddrType) && BdaCmp(pRec->peerAddr, pAddr))
    {
      return (appDbHdl_t) pRec;
    }
  }

  return APP_DB_HDL_NONE;
}

/*************************************************************************************************/
/*!
 *  \brief  Find a device database record by data in an LTK request.
 *
 *  \param  encDiversifier  Encryption diversifier associated with key.
 *  \param  pRandNum        Pointer to random number associated with key.
 *
 *  \return Database record handle or APP_DB_HDL_NONE if not found.
 */
/*************************************************************************************************/
appDbHdl_t AppDbFindByLtkReq(uint16_t encDiversifier, uint8_t *pRandNum)
{
  appDbRec_t  *pRec = appDb.rec;
  uint8_t     i;

  /* find matching record */
  for (i = APP_DB_NUM_RECS; i > 0; i--, pRec++)
  {
    if (pRec->inUse && (pRec->localLtk.ediv == encDiversifier) &&
        (memcmp(pRec->localLtk.rand, pRandNum, SMP_RAND8_LEN) == 0))
    {
      return (appDbHdl_t) pRec;
    }
  }

  return APP_DB_HDL_NONE;
}

/*************************************************************************************************/
/*!
 *  \brief  Get a key from a device database record.
 *
 *  \param  hdl       Database record handle.
 *  \param  type      Type of key to get.
 *  \param  pSecLevel If the key is valid, the security level of the key.
 *
 *  \return Pointer to key if key is valid or NULL if not valid.
 */
/*************************************************************************************************/
dmSecKey_t *AppDbGetKey(appDbHdl_t hdl, uint8_t type, uint8_t *pSecLevel)
{
  dmSecKey_t *pKey = NULL;

  /* if key valid */
  if ((type & ((appDbRec_t *) hdl)->keyValidMask) != 0)
  {
    switch(type)
    {
      case DM_KEY_LOCAL_LTK:
        *pSecLevel = ((appDbRec_t *) hdl)->localLtkSecLevel;
        pKey = (dmSecKey_t *) &((appDbRec_t *) hdl)->localLtk;
        break;

      case DM_KEY_PEER_LTK:
        *pSecLevel = ((appDbRec_t *) hdl)->peerLtkSecLevel;
        pKey = (dmSecKey_t *) &((appDbRec_t *) hdl)->peerLtk;
        break;

      case DM_KEY_IRK:
        pKey = (dmSecKey_t *)&((appDbRec_t *)hdl)->peerIrk;
        break;

      case DM_KEY_CSRK:
        pKey = (dmSecKey_t *)&((appDbRec_t *)hdl)->peerCsrk;
        break;

      default:
        break;
    }
  }

  return pKey;
}

/*************************************************************************************************/
/*!
 *  \brief  Set a key in a device database record.
 *
 *  \param  hdl       Database record handle.
 *  \param  pKey      Key data.
 *
 *  \return None.
 */
/*************************************************************************************************/
void AppDbSetKey(appDbHdl_t hdl, dmSecKeyIndEvt_t *pKey)
{
  switch(pKey->type)
  {
    case DM_KEY_LOCAL_LTK:
      ((appDbRec_t *) hdl)->localLtkSecLevel = pKey->secLevel;
      ((appDbRec_t *) hdl)->localLtk = pKey->keyData.ltk;
      break;

    case DM_KEY_PEER_LTK:
      ((appDbRec_t *) hdl)->peerLtkSecLevel = pKey->secLevel;
      ((appDbRec_t *) hdl)->peerLtk = pKey->keyData.ltk;
      break;

    case DM_KEY_IRK:
      ((appDbRec_t *)hdl)->peerIrk = pKey->keyData.irk;

      /* make sure peer record is stored using its identity address */
      ((appDbRec_t *)hdl)->addrType = pKey->keyData.irk.addrType;
      BdaCpy(((appDbRec_t *)hdl)->peerAddr, pKey->keyData.irk.bdAddr);
      break;

    case DM_KEY_CSRK:
      ((appDbRec_t *)hdl)->peerCsrk = pKey->keyData.csrk;

      /* sign counter must be initialized to zero when CSRK is generated */
      ((appDbRec_t *)hdl)->peerSignCounter = 0;
      break;

    default:
      break;
  }
}

/*************************************************************************************************/
/*!
 *  \brief  Get the client characteristic configuration descriptor table.
 *
 *  \param  hdl       Database record handle.
 *
 *  \return Pointer to client characteristic configuration descriptor table.
 */
/*************************************************************************************************/
uint16_t *AppDbGetCccTbl(appDbHdl_t hdl)
{
  return ((appDbRec_t *) hdl)->cccTbl;
}

/*************************************************************************************************/
/*!
 *  \brief  Set a value in the client characteristic configuration table.
 *
 *  \param  hdl       Database record handle.
 *  \param  idx       Table index.
 *  \param  value     client characteristic configuration value.
 *
 *  \return None.
 */
/*************************************************************************************************/
void AppDbSetCccTblValue(appDbHdl_t hdl, uint16_t idx, uint16_t value)
{
  WSF_ASSERT(idx < APP_DB_NUM_CCCD);

  ((appDbRec_t *) hdl)->cccTbl[idx] = value;
}

/*************************************************************************************************/
/*!
 *  \brief  Get the discovery status.
 *
 *  \param  hdl       Database record handle.
 *
 *  \return Discovery status.
 */
/*************************************************************************************************/
uint8_t AppDbGetDiscStatus(appDbHdl_t hdl)
{
  return ((appDbRec_t *) hdl)->discStatus;
}

/*************************************************************************************************/
/*!
 *  \brief  Set the discovery status.
 *
 *  \param  hdl       Database record handle.
 *  \param  state     Discovery status.
 *
 *  \return None.
 */
/*************************************************************************************************/
void AppDbSetDiscStatus(appDbHdl_t hdl, uint8_t status)
{
  ((appDbRec_t *) hdl)->discStatus = status;
}

/*************************************************************************************************/
/*!
 *  \brief  Get the cached handle list.
 *
 *  \param  hdl       Database record handle.
 *
 *  \return Pointer to handle list.
 */
/*************************************************************************************************/
uint16_t *AppDbGetHdlList(appDbHdl_t hdl)
{
  return ((appDbRec_t *) hdl)->hdlList;
}

/*************************************************************************************************/
/*!
 *  \brief  Set the cached handle list.
 *
 *  \param  hdl       Database record handle.
 *  \param  pHdlList  Pointer to handle list.
 *
 *  \return None.
 */
/*************************************************************************************************/
void AppDbSetHdlList(appDbHdl_t hdl, uint16_t *pHdlList)
{
  memcpy(((appDbRec_t *) hdl)->hdlList, pHdlList, sizeof(((appDbRec_t *) hdl)->hdlList));
}

/*************************************************************************************************/
/*!
 *  \brief  Get the device name.
 *
 *  \param  pLen      Returned device name length.
 *
 *  \return Pointer to UTF-8 string containing device name or NULL if not set.
 */
/*************************************************************************************************/
char *AppDbGetDevName(uint8_t *pLen)
{
  /* if first character of name is NULL assume it is uninitialized */
  if (appDb.devName[0] == 0)
  {
    *pLen = 0;
    return NULL;
  }
  else
  {
    *pLen = appDb.devNameLen;
    return appDb.devName;
  }
}

/*************************************************************************************************/
/*!
 *  \brief  Set the device name.
 *
 *  \param  len       Device name length.
 *  \param  pStr      UTF-8 string containing device name.
 *
 *  \return None.
 */
/*************************************************************************************************/
void AppDbSetDevName(uint8_t len, char *pStr)
{
  /* check for maximum device length */
  len = (len <= sizeof(appDb.devName)) ? len : sizeof(appDb.devName);

  memcpy(appDb.devName, pStr, len);
}

/*************************************************************************************************/
/*!
 *  \brief  Get address resolution attribute value read from a peer device.
 *
 *  \param  hdl        Database record handle.
 *
 *  \return TRUE if address resolution is supported in peer device. FALSE, otherwise.
 */
/*************************************************************************************************/
bool_t AppDbGetPeerAddrRes(appDbHdl_t hdl)
{
  return ((appDbRec_t *)hdl)->peerAddrRes;
}

/*************************************************************************************************/
/*!
 *  \brief  Set address resolution attribute value for a peer device.
 *
 *  \param  hdl        Database record handle.
 *  \param  addrRes    Address resolution attribue value.
 *
 *  \return None.
 */
/*************************************************************************************************/
void AppDbSetPeerAddrRes(appDbHdl_t hdl, uint8_t addrRes)
{
  ((appDbRec_t *)hdl)->peerAddrRes = addrRes;
}

/*************************************************************************************************/
/*!
 *  \brief  Get sign counter for a peer device.
 *
 *  \param  hdl        Database record handle.
 *
 *  \return Sign counter for peer device.
 */
/*************************************************************************************************/
uint32_t AppDbGetPeerSignCounter(appDbHdl_t hdl)
{
  return ((appDbRec_t *)hdl)->peerSignCounter;
}

/*************************************************************************************************/
/*!
 *  \brief  Set sign counter for a peer device.
 *
 *  \param  hdl          Database record handle.
 *  \param  signCounter  Sign counter for peer device.
 *
 *  \return None.
 */
/*************************************************************************************************/
void AppDbSetPeerSignCounter(appDbHdl_t hdl, uint32_t signCounter)
{
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  if(((appDbRec_t *)hdl)->peerSignCounter != signCounter) {
    ((appDbRec_t *)hdl)->peerSignCounter = signCounter;
  }
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}

/*************************************************************************************************/
/*!
 *  \brief  Get the peer device added to resolving list flag value.
 *
 *  \param  hdl        Database record handle.
 *
 *  \return TRUE if peer device's been added to resolving list. FALSE, otherwise.
 */
/*************************************************************************************************/
bool_t AppDbGetPeerAddedToRl(appDbHdl_t hdl)
{
  return ((appDbRec_t *)hdl)->peerAddedToRl;
}

/*************************************************************************************************/
/*!
 *  \brief  Set the peer device added to resolving list flag to a given value.
 *
 *  \param  hdl           Database record handle.
 *  \param  peerAddedToRl Peer device added to resolving list flag value.
 *
 *  \return None.
 */
/*************************************************************************************************/
void AppDbSetPeerAddedToRl(appDbHdl_t hdl, bool_t peerAddedToRl)
{
  ((appDbRec_t *)hdl)->peerAddedToRl = peerAddedToRl;
}

/*************************************************************************************************/
/*!
 *  \brief  Get the resolvable private address only attribute flag for a given peer device.
 *
 *  \param  hdl        Database record handle.
 *
 *  \return TRUE if RPA Only attribute is present on peer device. FALSE, otherwise.
 */
/*************************************************************************************************/
bool_t AppDbGetPeerRpao(appDbHdl_t hdl)
{
  return ((appDbRec_t *)hdl)->peerRpao;
}

/*************************************************************************************************/
/*!
 *  \brief  Set the resolvable private address only attribute flag for a given peer device.
 *
 *  \param  hdl        Database record handle.
 *  \param  peerRpao   Resolvable private address only attribute flag value.
 *
 *  \return None.
 */
/*************************************************************************************************/
void AppDbSetPeerRpao(appDbHdl_t hdl, bool_t peerRpao)
{
  ((appDbRec_t *)hdl)->peerRpao = peerRpao;
}
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/* clang-format on */