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blake / blake_db_legacy.c

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/*
Copyright (C) 2001-2007 Daybo Logic.
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. 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.
3. Neither the name of the project nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 PROJECT 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.
*/
/*
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  % Blake registered user database support functions module %
  % Copyright (C) 2002, Daybo Logic, all rights reserved.   %
  % Not for client access.  For server and registration     %
  % module ONLY!                                            %
  % David Duncan Ross Palmer <daybologic.co.uk/mailddrp>    %
  % R2 - Binary database                                    %
  % Created 25th February 2002                              %
  % Last modified 14th January 2007                         %
  % By whom: DDRP                                           %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
*/

/*
  Notes about the database
  ------------------------
  To prevent users being added when a thread has determined
  they are not present and then trying to add them... locks should
  be acquired!  This version of blakedb enforces that by only opening
  the database during locked periods.  This also speeds things up and
  ensures not only process integrity but also stopping other files
  locking it open during a gaurenteed locked period.  This requires
  support from Blake for file locking.  This revision of blakedb
  is designed for the simple flat file binary format with fixed
  length records.  It replaces the obsolete blakedb1 interface.
*/

#define BLAKE_SOURCE

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif /*HAVE_CONFIG_H*/

#include <assert.h>
#include <time.h>
#include <stdio.h>

#ifdef HAVE_LIMITS_H
# include <limits.h>
#endif /*HAVE_LIMITS_H*/

#ifdef HAVE_STRING_H
# include <string.h>
#endif /*HAVE_STRING_H*/

#ifdef HAVE_STDLIB_H
# include <stdlib.h>
#endif /*HAVE_STDLIB_H*/

#ifdef BLAKE_HDRSTOP
# pragma hdrstop
#endif /*BLAKE_HDRSTOP*/

#ifdef HAVE_DLSTDINC_H
# include "dlstdinc.h"
#endif /*HAVE_DLSTDINC_H*/

#ifdef HAVE_DPCRTLMM_H
# define USING_DPCRTLMM
# include "dpcrtlmm.h"
#endif /*HAVE_DPCRTLMM_H*/

#include "blake_threads.h"
#include "blake.h"
#include "blake_main.h"
#include "blake_logger.h"
#include "blake_db_legacy.h"
/*-------------------------------------------------------------------------*/
static const char *rcsid =
  "$Id: blake_db_legacy.c,v 2.1 2007/01/14 19:18:01 ddrp Exp $";

struct db_node {
  char *fn; /* Filename of assosiated database */
  FILE *filehandle; /* The actual file, NULL if file is closed */
  BLAKE_DATABASE_HANDLE dbhandle; /* The user mode handle of the database */

  #ifdef BLAKE_THREADS
  dtlock_t dblock; /* The handle of the user held lock */
  #endif /*BLAKE_THREADS*/
};

static struct {
  struct blake_link_ptrs linkList; /* Of db_nodes */

  #ifdef BLAKE_THREADS
  dtlock_t syncLock;
  #endif /*BLAKE_THREADS*/

} handleData;

static bool inited = false;

/*
  Generate a unique handle (lock handledata first!)
*/
static BLAKE_DATABASE_HANDLE GenHandle(void);

/*
  Tests if a handle is already used (lock handleData first!)
*/
static bool CheckHandle(
  BLAKE_DATABASE_HANDLE Handle
);

/*
  Internal destruction of said node
*/
static void DestroyNode(
  struct db_node *PNode
);

static void InitNode(
  struct db_node *PNode
);

static enum blakeError ChangeDatabaseLocking(
  BLAKE_DATABASE_HANDLE DBHandle,
  bool Lock
);

/*
  Self-locking, make sure you don't own a lock on the data
*/
static bool ReadHandleData(
  BLAKE_DATABASE_HANDLE DBHandle,
  struct db_node *PNode
);

static unsigned int FindFreeUserSlot(
  BLAKE_DATABASE_HANDLE DBH
);

static long unsigned int EndianConvertLong(
  long unsigned int Number,
  bool ToHost
);

static short unsigned int EndianConvertShort(
  short unsigned int Number,
  bool ToHost
);

static void LegacyHeaderEndianConverter(
  struct blake_db_legacy_header *PHeader,
  bool ToHost
);

static void RecordEndianConverter(
  struct blake_db_user *PUserRecord,
  bool ToHost
);

static enum blakeError ExclusiveOpen(
  const char *FIlename,
  FILE **Handle
);

static void ExclusiveClose(
  FILE **Handle
);

static bool WriteUser(
  FILE *FileStreamHandle,
  const struct blake_db_user *PUserData
);

/*
  CheckLeaks() should be called during cleanup
*/
static void CheckLeaks(void);

#define LockData() \
          daybothreads_EnterLock(&handleData.syncLock)
#define UnlockData() \
          daybothreads_LeaveLock(&handleData.syncLock)

#define NetToHost(rec) \
          RecordEndianConverter((rec), true)

#define HostToNet(rec) \
          RecordEndianConverter((rec), false)
/*-------------------------------------------------------------------------*/
#define LEGACY_HEADER_POSITION (0)

#define INDEX_TO_OFFSET(index) \
          ( \
            (LEGACY_HEADER_POSITION) + \
            (BLAKE_DB_LEGACY_HEADERSZ) + \
            ((BLAKE_DB_USERSZ)*(index)) \
          )
/*-------------------------------------------------------------------------*/
void blake_int_db_legacy_NCI()
{
  blake_Unused(rcsid);
}
/*-------------------------------------------------------------------------*/
bool blake_db_legacy_Init()
{
  daybothreads_CreateLock(&handleData.syncLock);

  handleData.linkList.size = sizeof(handleData.linkList);
  blake_InitLinkPtrs(&handleData.linkList, sizeof(struct db_node));
  inited = true;
  return inited;
}
/*-------------------------------------------------------------------------*/
void blake_db_legacy_Cleanup()
{
  daybothreads_EnterLock(&handleData.syncLock);
  CheckLeaks();
  daybothreads_LeaveLock(&handleData.syncLock);
  daybothreads_DestroyLock(&handleData.syncLock);
  handleData.linkList.DelAll(&handleData.linkList);
}
/*-------------------------------------------------------------------------*/
bool blake_db_legacy_IsInited()
{
  return inited;
}
/*-------------------------------------------------------------------------*/
BLAKEAPI(enum blakeError) blake_db_legacy_CreateHandle(
  const char *InFileName,
  BLAKE_DATABASE_HANDLE *PHandleOut
)
{
  struct db_node newNode;
  enum blakeError err = blakeSuccess;
  bool dataLocked = false;

  if ( !inited ) return blakeNotStarted;
  if ( !InFileName || !InFileName[0] ) return blakeInvalidParam;

  if ( PHandleOut ) *PHandleOut = BLAKE_INVALID_HANDLE; /* Init handle */

  InitNode(&newNode);
  newNode.fn = malloc( strlen(InFileName) + 1 );
  if ( !newNode.fn ) {
    err = blakeNotEnoughMem; /* Set error code */
    goto exitCreate;
  }
  daybothreads_CreateLock(&newNode.dblock);

  LockData();
  dataLocked = true;
  newNode.dbhandle = GenHandle();
  strcpy(newNode.fn, InFileName); /* Make copy of filename */

  if (
    handleData.linkList.AddToTail(
      &handleData.linkList,
      &newNode
    ) != blakeSuccess
  ) {
    DestroyNode(&newNode);
    err = blakeNotEnoughMem;
  }

  /* Give handle back to caller (forgot to do this before (oops)) */
  if ( PHandleOut ) *PHandleOut = newNode.dbhandle;

exitCreate:
  if ( dataLocked )
    UnlockData();
  return err;
}
/*-------------------------------------------------------------------------*/
BLAKEAPI(enum blakeError) blake_db_legacy_DestroyHandle(
  BLAKE_DATABASE_HANDLE DBHandle
)
{
  unsigned int i, c;
  bool ok = false;

  if ( !inited ) return blakeNotStarted;
  if ( DBHandle == BLAKE_INVALID_HANDLE )
    return blakeInvalidParam;

  LockData();
  c = handleData.linkList.Count(&handleData.linkList);
  for ( i = 0U; i < c; i++ ) {
    struct db_node node;

    handleData.linkList.Get(&handleData.linkList, i, &node);
    if ( node.dbhandle == DBHandle ) { /* This is the one! */
      DestroyNode(&node);
      handleData.linkList.DelByPos(&handleData.linkList, i);
      ok = true;
      break;
    }
  }
  UnlockData();
  if ( !ok )
    return blakeBadObject; /* Handle did not exist */
  return blakeSuccess;
}
/*-------------------------------------------------------------------------*/
BLAKEAPI(enum blakeError) blake_db_legacy_LockTable(
  BLAKE_DATABASE_HANDLE DBHandle
)
{
  return ChangeDatabaseLocking(DBHandle, true);
}
/*-------------------------------------------------------------------------*/
BLAKEAPI(void) blake_db_legacy_UnlockTable(BLAKE_DATABASE_HANDLE DBHandle)
{
  ChangeDatabaseLocking(DBHandle, false);
}
/*-------------------------------------------------------------------------*/
BLAKEAPI(enum blakeError) blake_db_legacy_GetUserData(
  BLAKE_DATABASE_HANDLE DBH,
  unsigned int Uid,
  struct blake_db_user *PUserData,
  size_t SizeOfUserData
)
{
  unsigned int userIndex;
  
  if ( Uid == 0U ) return blakeInvalidParam;
  userIndex = Uid - 1;
  if ( PUserData && SizeOfUserData ) {
    memset(PUserData, 0, SizeOfUserData);

    if ( !inited ) return blakeNotStarted;
    if ( DBH != BLAKE_INVALID_HANDLE ) {
      if ( PUserData ) {
        struct db_node node;

        if ( SizeOfUserData < sizeof(struct blake_db_user) ) {
          /* Some sort of alignment/version mismatch */
          return blakeMismatch;
        }
        if ( !ReadHandleData(DBH, &node) )
          return blakeBadObject;

        rewind(node.filehandle);
        fseek(node.filehandle, INDEX_TO_OFFSET(userIndex), SEEK_SET);
        /*
          Make sure it's all blank
        */
        blake_db_InitUser(PUserData, SizeOfUserData);
        if ( !node.filehandle )
          return blakeDbAccessRead; /* File should have been locked open */

        /*
          Start reading into blank record
        */
        if (
          fread(
            &PUserData->id,
            sizeof(PUserData->id),
            1,
            node.filehandle
          ) < 1
        ) return blakeSuccess;
        /* Obviously if this is the end of the database, pretend we succeed */

        if (
          fread(
            &PUserData->uid,
            sizeof(PUserData->uid),
            1,
            node.filehandle
          ) < 1
        ) return blakeFileTruncated;

        if (
          fread(
            PUserData->username,
            sizeof(PUserData->username)/sizeof(PUserData->username[0]),
            1,
            node.filehandle
          ) < 1
        ) return blakeFileTruncated;

        if (
          fread(
            PUserData->password,
            sizeof(PUserData->password)/sizeof(PUserData->password[0]),
            1,
            node.filehandle
          ) < 1
        ) return blakeFileTruncated;

        if (
          fread(
            PUserData->realname,
            sizeof(PUserData->realname)/sizeof(PUserData->realname[0]),
            1,
            node.filehandle
          ) < 1
        ) return blakeFileTruncated;

        if (
          fread(
            PUserData->email,
            sizeof(PUserData->email)/sizeof(PUserData->email[0]),
            1,
            node.filehandle
          ) < 1
        ) return blakeFileTruncated;

        if (
          fread(
            &PUserData->clearance,
            sizeof(PUserData->clearance),
            1,
            node.filehandle
          ) < 1
        ) return blakeFileTruncated;

        if (
          fread(
            PUserData->job,
            sizeof(PUserData->job)/sizeof(PUserData->job[0]),
            1,
            node.filehandle
          ) < 1
        ) return blakeFileTruncated;

        if (
          fread(
            PUserData->www,
            sizeof(PUserData->www)/sizeof(PUserData->www[0]),
            1,
            node.filehandle
          ) < 1
        ) return blakeFileTruncated;

        if (
          fread(
            PUserData->secretq,
            sizeof(PUserData->secretq)/sizeof(PUserData->secretq[0]),
            1,
            node.filehandle
          ) < 1
        ) return blakeFileTruncated;

        if (
          fread(
            PUserData->secreta,
            sizeof(PUserData->secreta)/sizeof(PUserData->secreta[0]),
            1,
            node.filehandle
          ) < 1
        ) return blakeFileTruncated;

        if (
          fread(
            &PUserData->time_reg,
            sizeof(PUserData->time_reg),
            1,
            node.filehandle
          ) < 1
        ) return blakeFileTruncated;

        if (
          fread(
            &PUserData->time_rec,
            sizeof(PUserData->time_rec),
            1,
            node.filehandle
          ) < 1
        ) return blakeFileTruncated;

        if (
          fread(
            &PUserData->time_last,
            sizeof(PUserData->time_last),
            1,
            node.filehandle
          ) < 1
        ) return blakeFileTruncated;

        if (
          fread(
            &PUserData->deleted,
            sizeof(PUserData->deleted),
            1,
            node.filehandle
          ) < 1
        ) return blakeFileTruncated;

        if (
          fread(
            &PUserData->enabled,
            sizeof(PUserData->enabled),
            1,
            node.filehandle
          ) < 1
        ) return blakeFileTruncated;

        if (
          fread(
            &PUserData->online,
            sizeof(PUserData->online),
            1,
            node.filehandle
          ) < 1
        ) return blakeFileTruncated;

        if (
          fread(
            &PUserData->login_count,
            sizeof(PUserData->login_count),
            1,
            node.filehandle
          ) < 1
        ) return blakeFileTruncated;

        if (
          fread(
            &PUserData->warning_level,
            sizeof(PUserData->warning_level),
            1,
            node.filehandle
          ) < 1
        ) return blakeFileTruncated;

        if (
          fread(
            &PUserData->kick_count,
            sizeof(PUserData->kick_count),
            1,
            node.filehandle
          ) < 1
        ) return blakeFileTruncated;

        if (
          fread(
            &PUserData->kill_count,
            sizeof(PUserData->kill_count),
            1,
            node.filehandle
          ) < 1
        ) return blakeFileTruncated;

        if (
          fread(
            &PUserData->brownie_points,
            sizeof(PUserData->brownie_points),
            1,
            node.filehandle
          ) < 1
        ) return blakeFileTruncated;

        if (
          fread(
            &PUserData->rate_limiter,
            sizeof(PUserData->rate_limiter),
            1,
            node.filehandle
          ) < 1
        ) return blakeFileTruncated;

        if (
          fread(
            &PUserData->checksum,
            sizeof(PUserData->checksum),
            1,
            node.filehandle
          ) < 1
        ) return blakeFileTruncated;

        NetToHost(PUserData); /* Ensure it's in machine readable endian */

        if ( !PUserData->deleted ) { /* Record exists */
          /* Let's check the checksum if it's nonzero */
          if ( PUserData->checksum ) {
            if ( blake_db_Checksum16(PUserData) != PUserData->checksum )
              return blakeDbRecordCorrupt; /* Bad news! */
          }
        }
        return blakeSuccess;
      }
    }
  }
  return blakeInvalidParam;
}
/*-------------------------------------------------------------------------*/
BLAKEAPI(enum blakeError) blake_db_legacy_CreateUser(
  BLAKE_DATABASE_HANDLE DBH,
  struct blake_db_user *PNewUserDataIn,
  unsigned int *PUserIndexOut
)
{
  struct db_node node;
  unsigned int newUserIndex;
  time_t registrationTime;
  struct blake_db_legacy_header header;
  enum blakeError err;

  if ( !inited ) return blakeNotStarted;
  if ( DBH == BLAKE_INVALID_HANDLE || !PNewUserDataIn )
    return blakeInvalidParam;

  if ( !ReadHandleData(DBH, &node) )
    return blakeBadObject;

  time(&registrationTime); /* Record time NOW! */

  newUserIndex = FindFreeUserSlot(DBH);
  if ( newUserIndex == 0 ) { /* First user? */
    /* Write database header */
    if ( !node.filehandle )
      return blakeDbAccessWrite; /* File has not been locked open */
    blake_db_InitLegacyHeader(&header);
    err = blake_db_PutLegacyHeader(DBH, &header);
    if ( err != blakeSuccess ) return err;
  }
  else if ( newUserIndex == UINT_MAX ) {
    /*
      About to overflow the database so say we're full even if
      it wastes one record
    */
    return blakeDbFull; /* The user database is full */
  }

  /* Give user the index though their pointer */
  if ( PUserIndexOut )
    *PUserIndexOut = newUserIndex;

  /*
    Set the date/time of registration and set the record creation
    time to the same (ie. they are not a legacy user from a previous
    version of the database).  Set the starting clearance lebel to the
    lowest, normal level set in blake.h
  */
  PNewUserDataIn->time_rec = registrationTime;
  PNewUserDataIn->time_rec = registrationTime;
  PNewUserDataIn->clearance = CLEARANCE_SETTING_DEFAULT;

  if ( !node.filehandle ) return blakeDbAccessWrite;
  assert(PNewUserDataIn->username);
  assert(PNewUserDataIn->password);
  assert(PNewUserDataIn->email);

  rewind(node.filehandle); /* Clear any error conditions */
  /*
    Go to position of overwritable/new record
  */
  fseek(node.filehandle, INDEX_TO_OFFSET(newUserIndex), SEEK_SET);
  printf("DEBUG:Sought to %lu (should be 256)\n", ftell(node.filehandle));

  PNewUserDataIn->checksum = blake_db_Checksum16(PNewUserDataIn);
  HostToNet(PNewUserDataIn);
  fflush(node.filehandle);
  if ( WriteUser(node.filehandle, PNewUserDataIn) )
    return blakeSuccess;

  return blakeDbFull; /* Can't write to the database */
}
/*-------------------------------------------------------------------------*/
BLAKEAPI(unsigned int) blake_db_legacy_GetUserIndex(
  BLAKE_DATABASE_HANDLE DBHandle,
  const char *NickName
)
{
  struct db_node node;
  unsigned int loop = 0U, uid = 0U;
  struct blake_db_user userData;

  if ( !inited ) return uid;
  if ( DBHandle == BLAKE_INVALID_HANDLE || !NickName )
    return uid;
  if ( !blake_NickTest(NickName, NULL, NULL) ) return uid;

  if ( !ReadHandleData(DBHandle, &node) ) /* Test object handle */
    return uid; /* Bad object */

  if ( !node.filehandle )
    return blakeDbAccessRead;

  for (;;) {
    rewind(node.filehandle);
    if ( fseek(node.filehandle, INDEX_TO_OFFSET(loop), SEEK_SET) == -1 ) {
      uid = loop;
      break;
    }
    if (
      fread(
        userData.username,
        sizeof(userData.username),
        1,
        node.filehandle
      ) < 1
    ) {
      uid = loop;
      break;
    }
    /* Test username */
    if ( blake_NickCompare(userData.username, NickName) ) {
      /* This is the correct nickname */
      uid = loop;
      break;
    }
    else if ( blake_NickCompare(userData.username, "") ) {
      /* Reached the end of the database */
      break;
    }
    loop++;
  }
  return uid;
}
/*-------------------------------------------------------------------------*/
BLAKEAPI(enum blakeError) blake_db_legacy_UpdateUser(
  BLAKE_DATABASE_HANDLE DBHandle,
  unsigned int Index,
  struct blake_db_user *NewUserRecord,
  size_t UserRecordSz
)
{
  struct db_node node;

  if ( !blake_int_IsInited() ) return blakeNotStarted;

  if ( DBHandle == BLAKE_INVALID_HANDLE || !NewUserRecord || !UserRecordSz )
    return blakeInvalidParam;

  /*
    Some sort or alignment / version mismatch
  */
  if ( UserRecordSz < sizeof(struct blake_db_user) )
    return blakeMismatch;

  if ( !ReadHandleData(DBHandle, &node) )
    return blakeBadObject;

  rewind(node.filehandle);
  if ( fseek(node.filehandle, INDEX_TO_OFFSET(Index), SEEK_SET) == -1 )
    return blakeDbAccessWrite;

  NewUserRecord->checksum = blake_db_Checksum16(NewUserRecord);
  HostToNet(NewUserRecord);
  if ( WriteUser(node.filehandle, NewUserRecord) )
    return blakeSuccess;
  return blakeDbAccessWrite; /* Can't write to the database */
}
/*-------------------------------------------------------------------------*/
BLAKEAPI(enum blakeError) blake_db_GetLegacyHeader(
  BLAKE_DATABASE_HANDLE DBHandle,
  struct blake_db_legacy_header *PHeaderOut
)
{
  struct db_node node;

  if ( !blake_int_IsInited() ) return blakeNotStarted;
  if ( DBHandle == BLAKE_INVALID_HANDLE || !PHeaderOut )
    return blakeInvalidParam;
  if ( !ReadHandleData(DBHandle, &node) )
    return blakeBadObject;

  fseek(node.filehandle, LEGACY_HEADER_POSITION, SEEK_SET);
  /*
    File should have been locked open!
  */
  if ( !node.filehandle ) return blakeDbAccessRead;

  if (
    fread(
      &PHeaderOut->Sig,
      sizeof(PHeaderOut->Sig),
      1,
      node.filehandle
    ) < 1
  )
    return blakeFileTruncated;

  if (
    fread(
      &PHeaderOut->Revision,
      sizeof(PHeaderOut->Revision),
      1,
      node.filehandle
    ) < 1
  )
    return blakeFileTruncated;

  if (
    fread(&PHeaderOut->Copyright,
    sizeof(PHeaderOut->Copyright),
    1,
    node.filehandle
    ) < 1
  )
    return blakeFileTruncated;

  LegacyHeaderEndianConverter(PHeaderOut, true); /* Convert to host format */
  return blakeSuccess;
}
/*-------------------------------------------------------------------------*/
BLAKEAPI(enum blakeError) blake_db_PutLegacyHeader(
  BLAKE_DATABASE_HANDLE DBHandle,
  const struct blake_db_legacy_header *PHeaderIn
)
{
  struct db_node node;
  struct blake_db_legacy_header swappedHeader; /* Header in host-independent format */

  if ( !blake_int_IsInited() ) return blakeNotStarted;
  if ( DBHandle == BLAKE_INVALID_HANDLE || !PHeaderIn )
    return blakeInvalidParam;
  if ( !ReadHandleData(DBHandle, &node) )
    return blakeBadObject;

  swappedHeader = *PHeaderIn;

  fseek(node.filehandle, LEGACY_HEADER_POSITION, SEEK_SET);

  /* File should have been locked open! */
  if ( !node.filehandle ) return blakeDbAccessWrite;
  /* Convert to host-independent format */
  LegacyHeaderEndianConverter(&swappedHeader, false);

  if (
    fwrite(
      &swappedHeader.Sig,
      sizeof(swappedHeader.Sig),
      1,
      node.filehandle
    ) < 1
  )
    return blakeDbAccessWrite;

  if (
    fwrite(
      &swappedHeader.Revision,
      sizeof(swappedHeader.Revision),
      1,
      node.filehandle
    ) < 1
  )
    return blakeDbAccessWrite;

  if (
    fwrite(
      &swappedHeader.Copyright,
      sizeof(swappedHeader.Copyright),
      1,
      node.filehandle
    ) < 1
  )
    return blakeDbAccessWrite;

  return blakeSuccess;
}
/*-------------------------------------------------------------------------*/
BLAKEAPI(enum blakeError) blake_db_InitLegacyHeader(
  struct blake_db_legacy_header *PHeader
)
{
  if ( !blake_int_IsInited() ) return blakeNotStarted;
  if ( !PHeader ) return blakeInvalidParam;

  PHeader->Sig = BLAKE_DB_LEGACY_HEADER_SIG;
  PHeader->Revision = BLAKE_DB_LEGACY_HEADER_REVISION;
  memset(PHeader->Copyright, 0, sizeof(PHeader->Copyright));
  strncat(
    PHeader->Copyright,
    BLAKE_DB_LEGACY_HEADER_COPYRIGHT,
    sizeof(PHeader->Copyright)
  );

  return blakeSuccess;
}
/*-------------------------------------------------------------------------*/
BLAKEAPI(unsigned long int) blake_db_legacy_CountUsers(
  BLAKE_DATABASE_HANDLE DBHandle
)
{
  unsigned long int count = 0UL; /* Count of users */
  unsigned int uid = 0U; /* Current user ID */
  struct blake_db_user userData;
  bool loop = true;

  do {
    enum blakeError err;
    blake_db_InitUser(&userData, sizeof(userData));
    err = blake_db_legacy_GetUserData(DBHandle, uid++, &userData, sizeof(userData));
    switch ( err ) {
      case blakeDbRecordCorrupt : {
        continue;
      }
      case blakeSuccess : { /* Normal */
        if ( userData.deleted ) {
          continue;
        }
        if ( !userData.time_reg ) { /* End of DB */
          loop = false;
          continue;
        }

        count++; /* Increase count of users */
        break;
      }
      default : {
        loop = false; /* Problems */
      }
    }
  } while (loop);

  return count;
}
/*-------------------------------------------------------------------------*/
static BLAKE_DATABASE_HANDLE GenHandle()
{
  BLAKE_DATABASE_HANDLE gen;

  do {
    gen = (BLAKE_DATABASE_HANDLE)( rand() * rand() );
  } while ( gen == 0 || CheckHandle(gen) );

  return gen;
}
/*-------------------------------------------------------------------------*/
static bool CheckHandle(BLAKE_DATABASE_HANDLE Handle)
{
  bool used = false;
  if ( Handle != BLAKE_INVALID_HANDLE ) {
    struct db_node node;
    unsigned int i, c;

    c = handleData.linkList.Count(&handleData.linkList);
    for ( i = 0U; i < c; i++ ) {
      handleData.linkList.Get(&handleData.linkList, i, &node);
      if ( node.dbhandle == Handle ) {
        used = true;
        break;
      }
    }
  }
  return used;
}
/*-------------------------------------------------------------------------*/
static void DestroyNode(struct db_node *PNode)
{
  if ( PNode ) {
    if ( PNode->fn )
      free(PNode->fn);

    if ( PNode->filehandle )
      ExclusiveClose(&PNode->filehandle);

    daybothreads_DestroyLock(&PNode->dblock);
    InitNode(PNode); /* For cleanliness */
  }
}
/*-------------------------------------------------------------------------*/
static void InitNode(struct db_node *PNode)
{
  if ( PNode ) {
    PNode->fn = NULL;
    PNode->filehandle = NULL;
    PNode->dbhandle = BLAKE_INVALID_HANDLE;
  }
}
/*-------------------------------------------------------------------------*/
static enum blakeError ChangeDatabaseLocking(
  BLAKE_DATABASE_HANDLE DBHandle,
  bool Lock
)
{
  enum blakeError err = blakeSuccess;
  if ( DBHandle != BLAKE_INVALID_HANDLE && inited ) {
    unsigned int i, c;

    LockData();
    c = handleData.linkList.Count(&handleData.linkList);
    for ( i = 0U; i < c; i++ ) {
      struct db_node node;
      bool found = false;

      handleData.linkList.Get(&handleData.linkList, i, &node);
      daybothreads_EnterLock(&node.dblock);
      if ( node.dbhandle == DBHandle ) {
        if ( Lock )
          err = ExclusiveOpen(node.fn, &node.filehandle);
        else
          ExclusiveClose(&node.filehandle);

        handleData.linkList.Set(&handleData.linkList, i, &node);
        found = true;
      }
      daybothreads_LeaveLock(&node.dblock);
      if ( found ) break;
    }
    UnlockData();
  }
  return err;
}
/*-------------------------------------------------------------------------*/
static bool ReadHandleData(
  BLAKE_DATABASE_HANDLE DBHandle,
  struct db_node *PNode
)
{
  bool found = false;
  unsigned int i, c;

  LockData();
  c = handleData.linkList.Count(&handleData.linkList);
  for ( i = 0U; i < c; i++ ) {
    handleData.linkList.Get(&handleData.linkList, i, PNode);

    if ( PNode->dbhandle == DBHandle ) {
      found = true;
      break;
    }
  }
  UnlockData();
  return found;
}
/*-------------------------------------------------------------------------*/
static unsigned int FindFreeUserSlot(BLAKE_DATABASE_HANDLE DBH)
{
  unsigned long lastUser = 0U;
  struct blake_db_user record;

  do {
    if (
      blake_db_legacy_GetUserData(
        DBH,
        lastUser,
        &record,
        sizeof(record)
      ) == blakeSuccess
    ) {
      if ( !record.time_reg ) break;
      if ( record.deleted ) break;
    }
  } while ( ++lastUser != 0 );
  /* All the way until overflow or unless last user is found! */

  return lastUser;
}
/*-------------------------------------------------------------------------*/
static short unsigned int EndianConvertShort(
  short unsigned int Number,
  bool ToHost
)
{
  if ( ToHost )
    return network_NetToHostShort(Number);
  return network_HostToNetShort(Number);
}
/*-------------------------------------------------------------------------*/
static long unsigned int EndianConvertLong(
  long unsigned int Number,
  bool ToHost
)
{
  if ( ToHost )
    return network_NetToHostLong(Number);
  return network_HostToNetLong(Number);
}
/*-------------------------------------------------------------------------*/
static void LegacyHeaderEndianConverter(
  struct blake_db_legacy_header *PHeader,
  bool ToHost
)
{
  PHeader->Sig = (blake_word32_t)EndianConvertLong(
    (unsigned long int)PHeader->Sig,
    ToHost
  );

  PHeader->Revision = (blake_word16_t)EndianConvertShort(
    (unsigned short int)PHeader->Revision,
    ToHost
  );
}
/*-------------------------------------------------------------------------*/
static void RecordEndianConverter(
  struct blake_db_user *PUserData,
  bool ToHost
)
{
  PUserData->id = (blake_word32_t)EndianConvertLong(
    PUserData->id,
    ToHost
  );

  PUserData->uid = (blake_word32_t)EndianConvertLong(
    PUserData->uid,
    ToHost
  );

  PUserData->clearance = (blake_word16_t)EndianConvertShort(
    (short unsigned int)PUserData->clearance,
    ToHost
  );

  PUserData->time_reg = (blake_word32_t)EndianConvertLong(
    (long unsigned int)PUserData->time_reg,
    ToHost
  );

  PUserData->time_rec = (blake_word32_t)EndianConvertLong(
    (long unsigned int)PUserData->time_rec,
    ToHost
  );

  PUserData->time_last = (blake_word32_t)EndianConvertLong(
    (long unsigned int)PUserData->time_last,
    ToHost
  );

  PUserData->login_count = (blake_word32_t)EndianConvertLong(
    (long unsigned int)PUserData->login_count,
    ToHost
  );

  PUserData->warning_level = (blake_word16_t)EndianConvertShort(
    (short unsigned int)PUserData->warning_level,
    ToHost
  );

  PUserData->rate_limiter = (blake_word16_t)EndianConvertShort(
    (short unsigned int)PUserData->rate_limiter,
    ToHost
  );

  PUserData->brownie_points = (blake_word32_t)EndianConvertLong(
    (long unsigned int)PUserData->brownie_points,
    ToHost
  );

  PUserData->kick_count = (blake_word32_t)EndianConvertLong(
    (long unsigned int)PUserData->kick_count,
    ToHost
  );

  PUserData->kill_count = (blake_word16_t)EndianConvertLong(
    (short unsigned int)PUserData->kill_count,
    ToHost
  );

  PUserData->checksum = (blake_word16_t)EndianConvertLong(
    (short unsigned int)PUserData->checksum,
    ToHost
  );
  return;
}
/*-------------------------------------------------------------------------*/
static enum blakeError ExclusiveOpen(
  const char *Filename,
  FILE **Handle
)
{
  enum blakeError err;

  if ( !Filename || !Handle || *Handle ) /* Note: Handle must be clean! */
    return blakeInvalidParam;

  err = blake_ExclusiveFileOpen(Filename, true, Handle);
  if ( err != blakeSuccess )
    blake_int_LogErr(err);

  return err;
}
/*-------------------------------------------------------------------------*/
static void ExclusiveClose(
  FILE **Handle
)
{
  if ( *Handle ) {
    blake_ExclusiveFileClose(*Handle);
    *Handle = NULL;
  }
}
/*-------------------------------------------------------------------------*/
static bool WriteUser(
  FILE *FileStreamHandle,
  const struct blake_db_user *PUserData
)
{
  if (
    fwrite(
      &PUserData->id,
      sizeof(PUserData->id),
      1,
      FileStreamHandle
    ) < 1
  )
    return false;

  if (
    fwrite(
      &PUserData->uid,
      sizeof(PUserData->uid),
      1,
      FileStreamHandle
    ) < 1
  )
    return false;

  if (
    fwrite(
      PUserData->username,
      sizeof(PUserData->username) / sizeof(PUserData->username[0]),
      1,
      FileStreamHandle
    ) < 1
  )
    return false;

  if (
    fwrite(
      PUserData->password,
      sizeof(PUserData->password) / sizeof(PUserData->password[0]),
      1,
      FileStreamHandle
    ) < 1
  )
    return false;

  if (
    fwrite(
      PUserData->realname,
      sizeof(PUserData->realname) / sizeof(PUserData->realname[0]),
      1,
      FileStreamHandle
    ) < 1
  )
    return false;

  if (
    fwrite(
      PUserData->email,
      sizeof(PUserData->email) / sizeof(PUserData->email[0]),
      1,
      FileStreamHandle
    ) < 1
  )
    return false;

  if (
    fwrite(
      &PUserData->clearance,
      sizeof(PUserData->clearance),
      1,
      FileStreamHandle
    ) < 1
  )
    return false;

  if (
    fwrite(
      PUserData->job,
      sizeof(PUserData->job) / sizeof(PUserData->job[0]),
      1,
      FileStreamHandle
    ) < 1
  )
    return false;

  if (
    fwrite(
      PUserData->www,
      sizeof(PUserData->www) / sizeof(PUserData->www[0]),
      1,
      FileStreamHandle
    ) < 1
  )
    return false;

  if (
    fwrite(
      PUserData->secretq,
      sizeof(PUserData->secretq) / sizeof(PUserData->secretq[0]),
      1,
      FileStreamHandle
    ) < 1
  )
    return false;

  if (
    fwrite(
      PUserData->secretq,
      sizeof(PUserData->secreta) / sizeof(PUserData->secreta[0]),
      1,
      FileStreamHandle
    ) < 1
  )
    return false;

  if (
    fwrite(
      &PUserData->time_reg,
      sizeof(PUserData->time_reg),
      1,
      FileStreamHandle
    ) < 1
  )
    return false;

  if (
    fwrite(
      &PUserData->time_rec,
      sizeof(PUserData->time_rec),
      1,
      FileStreamHandle
    ) < 1
  )
    return false;

  if (
    fwrite(
      &PUserData->time_last,
      sizeof(PUserData->time_last),
      1,
      FileStreamHandle
    ) < 1
  )
    return false;

  if (
     fwrite(
      &PUserData->deleted,
      sizeof(PUserData->deleted),
      1,
      FileStreamHandle
    ) < 1
  )
    return false;

  if (
    fwrite(
      &PUserData->enabled,
      sizeof(PUserData->enabled),
      1,
      FileStreamHandle
    ) < 1
  )
    return false;

  if (
    fwrite(
      &PUserData->online,
      sizeof(PUserData->online),
      1,
      FileStreamHandle
    ) < 1
  )
    return false;

  if (
    fwrite(
      &PUserData->login_count,
      sizeof(PUserData->login_count),
      1,
      FileStreamHandle
    ) < 1
  )
    return false;

  if (
    fwrite(
      &PUserData->warning_level,
      sizeof(PUserData->warning_level),
      1,
      FileStreamHandle
    ) < 1
  )
    return false;

  if (
    fwrite(
      &PUserData->kick_count,
      sizeof(PUserData->kick_count),
      1,
      FileStreamHandle
    ) < 1
  )
    return false;

  if (
    fwrite(
      &PUserData->kill_count,
      sizeof(PUserData->kill_count),
      1,
      FileStreamHandle
    ) < 1
  )
    return false;

  if (
    fwrite(
      &PUserData->brownie_points,
      sizeof(PUserData->brownie_points),
      1,
      FileStreamHandle
    ) < 1
  )
    return false;

  if (
    fwrite(
      &PUserData->rate_limiter,
      sizeof(PUserData->rate_limiter),
      1,
      FileStreamHandle
    ) < 1
  )
    return false;

  if (
    fwrite(
      &PUserData->checksum,
      sizeof(PUserData->checksum),
      1,
      FileStreamHandle
    ) < 1
  )
    return false;

  fflush(FileStreamHandle);
  return true;
}
/*-------------------------------------------------------------------------*/
static void CheckLeaks()
{
  unsigned int c, i;

  c = handleData.linkList.Count(&handleData.linkList);
  for ( i = 0U; i < c; i++ ) {
    struct db_node node;

    handleData.linkList.Get(&handleData.linkList, i, &node);
    fprintf(
      stderr,
      "blake_db_legacy: Warning, leaked handle %X (%s)\n",
      node.dbhandle,
      node.fn
    );
  }
  return;
}
/*-------------------------------------------------------------------------*/