Logo Search packages:      
Sourcecode: likewise-open version File versions  Download package

regfio.c

/*
 * Unix SMB/CIFS implementation.
 * Windows NT registry I/O library
 * Copyright (c) Gerald (Jerry) Carter               2005
 *
 * 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 3 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/>.  
 */

#include "includes.h"
#include "regfio.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_REGISTRY

/*******************************************************************
 *
 * TODO : Right now this code basically ignores classnames.
 *
 ******************************************************************/


/*******************************************************************
*******************************************************************/

static int write_block( REGF_FILE *file, prs_struct *ps, uint32 offset )
{
      int bytes_written, returned;
      char *buffer = prs_data_p( ps );
      uint32 buffer_size = prs_data_size( ps );
      SMB_STRUCT_STAT sbuf;

      if ( file->fd == -1 )
            return -1;

      /* check for end of file */

      if ( sys_fstat( file->fd, &sbuf ) ) {
            DEBUG(0,("write_block: stat() failed! (%s)\n", strerror(errno)));
            return -1;
      }

      if ( lseek( file->fd, offset, SEEK_SET ) == -1 ) {
            DEBUG(0,("write_block: lseek() failed! (%s)\n", strerror(errno) ));
            return -1;
      }
      
      bytes_written = returned = 0;
      while ( bytes_written < buffer_size ) {
            if ( (returned = write( file->fd, buffer+bytes_written, buffer_size-bytes_written )) == -1 ) {
                  DEBUG(0,("write_block: write() failed! (%s)\n", strerror(errno) ));
                  return False;
            }
                        
            bytes_written += returned;
      }
      
      return bytes_written;
}

/*******************************************************************
*******************************************************************/

static int read_block( REGF_FILE *file, prs_struct *ps, uint32 file_offset, uint32 block_size )
{
      int bytes_read, returned;
      char *buffer;
      SMB_STRUCT_STAT sbuf;

      /* check for end of file */

      if ( sys_fstat( file->fd, &sbuf ) ) {
            DEBUG(0,("read_block: stat() failed! (%s)\n", strerror(errno)));
            return -1;
      }

      if ( (size_t)file_offset >= sbuf.st_size )
            return -1;
      
      /* if block_size == 0, we are parsing HBIN records and need 
         to read some of the header to get the block_size from there */
         
      if ( block_size == 0 ) {
            char hdr[0x20];

            if ( lseek( file->fd, file_offset, SEEK_SET ) == -1 ) {
                  DEBUG(0,("read_block: lseek() failed! (%s)\n", strerror(errno) ));
                  return -1;
            }

            returned = read( file->fd, hdr, 0x20 );
            if ( (returned == -1) || (returned < 0x20) ) {
                  DEBUG(0,("read_block: failed to read in HBIN header. Is the file corrupt?\n"));
                  return -1;
            }

            /* make sure this is an hbin header */

            if ( strncmp( hdr, "hbin", HBIN_HDR_SIZE ) != 0 ) {
                  DEBUG(0,("read_block: invalid block header!\n"));
                  return -1;
            }

            block_size = IVAL( hdr, 0x08 );
      }

      DEBUG(10,("read_block: block_size == 0x%x\n", block_size ));

      /* set the offset, initialize the buffer, and read the block from disk */

      if ( lseek( file->fd, file_offset, SEEK_SET ) == -1 ) {
            DEBUG(0,("read_block: lseek() failed! (%s)\n", strerror(errno) ));
            return -1;
      }
      
      prs_init( ps, block_size, file->mem_ctx, UNMARSHALL );
      buffer = prs_data_p( ps );
      bytes_read = returned = 0;

      while ( bytes_read < block_size ) {
            if ( (returned = read( file->fd, buffer+bytes_read, block_size-bytes_read )) == -1 ) {
                  DEBUG(0,("read_block: read() failed (%s)\n", strerror(errno) ));
                  return False;
            }
            if ( (returned == 0) && (bytes_read < block_size) ) {
                  DEBUG(0,("read_block: not a vald registry file ?\n" ));
                  return False;
            }     
            
            bytes_read += returned;
      }
      
      return bytes_read;
}

/*******************************************************************
*******************************************************************/

static bool write_hbin_block( REGF_FILE *file, REGF_HBIN *hbin )
{
      if ( !hbin->dirty )
            return True;

      /* write free space record if any is available */

      if ( hbin->free_off != REGF_OFFSET_NONE ) {
            uint32 header = 0xffffffff;

            if ( !prs_set_offset( &hbin->ps, hbin->free_off-sizeof(uint32) ) )
                  return False;
            if ( !prs_uint32( "free_size", &hbin->ps, 0, &hbin->free_size ) )
                  return False;
            if ( !prs_uint32( "free_header", &hbin->ps, 0, &header ) )
                  return False;
      }

      hbin->dirty = (write_block( file, &hbin->ps, hbin->file_off ) != -1);

      return hbin->dirty;
}

/*******************************************************************
*******************************************************************/

static bool hbin_block_close( REGF_FILE *file, REGF_HBIN *hbin )
{
      REGF_HBIN *p;

      /* remove the block from the open list and flush it to disk */

      for ( p=file->block_list; p && p!=hbin; p=p->next )
            ;;

      if ( p == hbin ) {
            DLIST_REMOVE( file->block_list, hbin );
      }
      else
            DEBUG(0,("hbin_block_close: block not in open list!\n"));

      if ( !write_hbin_block( file, hbin ) )
            return False;

      return True;
}

/*******************************************************************
*******************************************************************/

static bool prs_regf_block( const char *desc, prs_struct *ps, int depth, REGF_FILE *file )
{
      prs_debug(ps, depth, desc, "prs_regf_block");
      depth++;
      
      if ( !prs_uint8s( True, "header", ps, depth, (uint8*)file->header, sizeof( file->header )) )
            return False;
      
      /* yes, these values are always identical so store them only once */
      
      if ( !prs_uint32( "unknown1", ps, depth, &file->unknown1 ))
            return False;
      if ( !prs_uint32( "unknown1 (again)", ps, depth, &file->unknown1 ))
            return False;

      /* get the modtime */
      
      if ( !prs_set_offset( ps, 0x0c ) )
            return False;
      if ( !smb_io_time( "modtime", &file->mtime, ps, depth ) )
            return False;

      /* constants */
      
      if ( !prs_uint32( "unknown2", ps, depth, &file->unknown2 ))
            return False;
      if ( !prs_uint32( "unknown3", ps, depth, &file->unknown3 ))
            return False;
      if ( !prs_uint32( "unknown4", ps, depth, &file->unknown4 ))
            return False;
      if ( !prs_uint32( "unknown5", ps, depth, &file->unknown5 ))
            return False;

      /* get file offsets */
      
      if ( !prs_set_offset( ps, 0x24 ) )
            return False;
      if ( !prs_uint32( "data_offset", ps, depth, &file->data_offset ))
            return False;
      if ( !prs_uint32( "last_block", ps, depth, &file->last_block ))
            return False;
            
      /* one more constant */
      
      if ( !prs_uint32( "unknown6", ps, depth, &file->unknown6 ))
            return False;
            
      /* get the checksum */
      
      if ( !prs_set_offset( ps, 0x01fc ) )
            return False;
      if ( !prs_uint32( "checksum", ps, depth, &file->checksum ))
            return False;
      
      return True;
}

/*******************************************************************
*******************************************************************/

static bool prs_hbin_block( const char *desc, prs_struct *ps, int depth, REGF_HBIN *hbin )
{
      uint32 block_size2;

      prs_debug(ps, depth, desc, "prs_regf_block");
      depth++;
      
      if ( !prs_uint8s( True, "header", ps, depth, (uint8*)hbin->header, sizeof( hbin->header )) )
            return False;

      if ( !prs_uint32( "first_hbin_off", ps, depth, &hbin->first_hbin_off ))
            return False;

      /* The dosreg.cpp comments say that the block size is at 0x1c.
         According to a WINXP NTUSER.dat file, this is wrong.  The block_size
         is at 0x08 */

      if ( !prs_uint32( "block_size", ps, depth, &hbin->block_size ))
            return False;

      block_size2 = hbin->block_size;
      prs_set_offset( ps, 0x1c );
      if ( !prs_uint32( "block_size2", ps, depth, &block_size2 ))
            return False;

      if ( MARSHALLING(ps) )
            hbin->dirty = True;
      

      return True;
}

/*******************************************************************
*******************************************************************/

static bool prs_nk_rec( const char *desc, prs_struct *ps, int depth, REGF_NK_REC *nk )
{
      uint16 class_length, name_length;
      uint32 start;
      uint32 data_size, start_off, end_off;
      uint32 unknown_off = REGF_OFFSET_NONE;

      nk->hbin_off = prs_offset( ps );
      start = nk->hbin_off;
      
      prs_debug(ps, depth, desc, "prs_nk_rec");
      depth++;
      
      /* back up and get the data_size */
      
      if ( !prs_set_offset( ps, prs_offset(ps)-sizeof(uint32)) )
            return False;
      start_off = prs_offset( ps );
      if ( !prs_uint32( "rec_size", ps, depth, &nk->rec_size ))
            return False;
      
      if ( !prs_uint8s( True, "header", ps, depth, (uint8*)nk->header, sizeof( nk->header )) )
            return False;
            
      if ( !prs_uint16( "key_type", ps, depth, &nk->key_type ))
            return False;
      if ( !smb_io_time( "mtime", &nk->mtime, ps, depth ))
            return False;
            
      if ( !prs_set_offset( ps, start+0x0010 ) )
            return False;
      if ( !prs_uint32( "parent_off", ps, depth, &nk->parent_off ))
            return False;
      if ( !prs_uint32( "num_subkeys", ps, depth, &nk->num_subkeys ))
            return False;
            
      if ( !prs_set_offset( ps, start+0x001c ) )
            return False;
      if ( !prs_uint32( "subkeys_off", ps, depth, &nk->subkeys_off ))
            return False;
      if ( !prs_uint32( "unknown_off", ps, depth, &unknown_off) )
            return False;
            
      if ( !prs_set_offset( ps, start+0x0024 ) )
            return False;
      if ( !prs_uint32( "num_values", ps, depth, &nk->num_values ))
            return False;
      if ( !prs_uint32( "values_off", ps, depth, &nk->values_off ))
            return False;
      if ( !prs_uint32( "sk_off", ps, depth, &nk->sk_off ))
            return False;
      if ( !prs_uint32( "classname_off", ps, depth, &nk->classname_off ))
            return False;

      if ( !prs_uint32( "max_bytes_subkeyname", ps, depth, &nk->max_bytes_subkeyname))
            return False;
      if ( !prs_uint32( "max_bytes_subkeyclassname", ps, depth, &nk->max_bytes_subkeyclassname))
            return False;
      if ( !prs_uint32( "max_bytes_valuename", ps, depth, &nk->max_bytes_valuename))
            return False;
      if ( !prs_uint32( "max_bytes_value", ps, depth, &nk->max_bytes_value))
            return False;
      if ( !prs_uint32( "unknown index", ps, depth, &nk->unk_index))
            return False;

      name_length = nk->keyname ? strlen(nk->keyname) : 0 ;
      class_length = nk->classname ? strlen(nk->classname) : 0 ;
      if ( !prs_uint16( "name_length", ps, depth, &name_length ))
            return False;
      if ( !prs_uint16( "class_length", ps, depth, &class_length ))
            return False;     
            
      if ( class_length ) {
            ;;
      }
      
      if ( name_length ) {
            if ( UNMARSHALLING(ps) ) {
                  if ( !(nk->keyname = PRS_ALLOC_MEM( ps, char, name_length+1 )) )
                        return False;
            }

            if ( !prs_uint8s( True, "name", ps, depth, (uint8*)nk->keyname, name_length) )
                  return False;

            if ( UNMARSHALLING(ps) ) 
                  nk->keyname[name_length] = '\0';
      }

      end_off = prs_offset( ps );

      /* data_size must be divisible by 8 and large enough to hold the original record */

      data_size = ((start_off - end_off) & 0xfffffff8 );
      if ( data_size > nk->rec_size )
            DEBUG(10,("Encountered reused record (0x%x < 0x%x)\n", data_size, nk->rec_size));

      if ( MARSHALLING(ps) )
            nk->hbin->dirty = True;

      return True;
}

/*******************************************************************
*******************************************************************/

static uint32 regf_block_checksum( prs_struct *ps )
{
      char *buffer = prs_data_p( ps );
      uint32 checksum, x;
      int i;

      /* XOR of all bytes 0x0000 - 0x01FB */
            
      checksum = x = 0;
      
      for ( i=0; i<0x01FB; i+=4 ) {
            x = IVAL(buffer, i );
            checksum ^= x;
      }
      
      return checksum;
}

/*******************************************************************
*******************************************************************/

static bool read_regf_block( REGF_FILE *file )
{
      prs_struct ps;
      uint32 checksum;
      
      /* grab the first block from the file */
            
      if ( read_block( file, &ps, 0, REGF_BLOCKSIZE ) == -1 )
            return False;
      
      /* parse the block and verify the checksum */
      
      if ( !prs_regf_block( "regf_header", &ps, 0, file ) )
            return False;     
            
      checksum = regf_block_checksum( &ps );
      
      prs_mem_free( &ps );
      
      if ( file->checksum !=  checksum ) {
            DEBUG(0,("read_regf_block: invalid checksum\n" ));
            return False;
      }

      return True;
}

/*******************************************************************
*******************************************************************/

static REGF_HBIN* read_hbin_block( REGF_FILE *file, off_t offset )
{
      REGF_HBIN *hbin;
      uint32 record_size, curr_off, block_size, header;
      
      if ( !(hbin = TALLOC_ZERO_P(file->mem_ctx, REGF_HBIN)) ) 
            return NULL;
      hbin->file_off = offset;
      hbin->free_off = -1;
            
      if ( read_block( file, &hbin->ps, offset, 0 ) == -1 )
            return NULL;
      
      if ( !prs_hbin_block( "hbin", &hbin->ps, 0, hbin ) )
            return NULL;      

      /* this should be the same thing as hbin->block_size but just in case */

      block_size = prs_data_size( &hbin->ps );  

      /* Find the available free space offset.  Always at the end,
         so walk the record list and stop when you get to the end.
         The end is defined by a record header of 0xffffffff.  The 
         previous 4 bytes contains the amount of free space remaining 
         in the hbin block. */

      /* remember that the record_size is in the 4 bytes preceeding the record itself */

      if ( !prs_set_offset( &hbin->ps, file->data_offset+HBIN_HDR_SIZE-sizeof(uint32) ) )
            return False;

      record_size = 0;
      header = 0;
      curr_off = prs_offset( &hbin->ps );
      while ( header != 0xffffffff ) {
            /* not done yet so reset the current offset to the 
               next record_size field */

            curr_off = curr_off+record_size;

            /* for some reason the record_size of the last record in
               an hbin block can extend past the end of the block
               even though the record fits within the remaining 
               space....aaarrrgggghhhhhh */

            if ( curr_off >= block_size ) {
                  record_size = -1;
                  curr_off = -1;
                  break;
            }

            if ( !prs_set_offset( &hbin->ps, curr_off) )
                  return False;

            if ( !prs_uint32( "rec_size", &hbin->ps, 0, &record_size ) )
                  return False;
            if ( !prs_uint32( "header", &hbin->ps, 0, &header ) )
                  return False;
            
            SMB_ASSERT( record_size != 0 );

            if ( record_size & 0x80000000 ) {
                  /* absolute_value(record_size) */
                  record_size = (record_size ^ 0xffffffff) + 1;
            }
      }

      /* save the free space offset */

      if ( header == 0xffffffff ) {

            /* account for the fact that the curr_off is 4 bytes behind the actual 
               record header */

            hbin->free_off = curr_off + sizeof(uint32);
            hbin->free_size = record_size;
      }

      DEBUG(10,("read_hbin_block: free space offset == 0x%x\n", hbin->free_off));

      if ( !prs_set_offset( &hbin->ps, file->data_offset+HBIN_HDR_SIZE )  )
            return False;
      
      return hbin;
}

/*******************************************************************
 Input a random offset and receive the corresponding HBIN 
 block for it
*******************************************************************/

static bool hbin_contains_offset( REGF_HBIN *hbin, uint32 offset )
{
      if ( !hbin )
            return False;
      
      if ( (offset > hbin->first_hbin_off) && (offset < (hbin->first_hbin_off+hbin->block_size)) )
            return True;
            
      return False;
}

/*******************************************************************
 Input a random offset and receive the corresponding HBIN 
 block for it
*******************************************************************/

static REGF_HBIN* lookup_hbin_block( REGF_FILE *file, uint32 offset )
{
      REGF_HBIN *hbin = NULL;
      uint32 block_off;

      /* start with the open list */

      for ( hbin=file->block_list; hbin; hbin=hbin->next ) {
            DEBUG(10,("lookup_hbin_block: address = 0x%x [0x%lx]\n", hbin->file_off, (unsigned long)hbin ));
            if ( hbin_contains_offset( hbin, offset ) )
                  return hbin;
      }
      
      if ( !hbin ) {
            /* start at the beginning */

            block_off = REGF_BLOCKSIZE;
            do {
                  /* cleanup before the next round */
                  if ( hbin )
                        prs_mem_free( &hbin->ps );

                  hbin = read_hbin_block( file, block_off );

                  if ( hbin ) 
                        block_off = hbin->file_off + hbin->block_size;

            } while ( hbin && !hbin_contains_offset( hbin, offset ) );
      }

      if ( hbin )
            DLIST_ADD( file->block_list, hbin );

      return hbin;
}

/*******************************************************************
*******************************************************************/

static bool prs_hash_rec( const char *desc, prs_struct *ps, int depth, REGF_HASH_REC *hash )
{
      prs_debug(ps, depth, desc, "prs_hash_rec");
      depth++;

      if ( !prs_uint32( "nk_off", ps, depth, &hash->nk_off ))
            return False;
      if ( !prs_uint8s( True, "keycheck", ps, depth, hash->keycheck, sizeof( hash->keycheck )) )
            return False;
      
      return True;
}

/*******************************************************************
*******************************************************************/

static bool hbin_prs_lf_records( const char *desc, REGF_HBIN *hbin, int depth, REGF_NK_REC *nk )
{
      int i;
      REGF_LF_REC *lf = &nk->subkeys;
      uint32 data_size, start_off, end_off;

      prs_debug(&hbin->ps, depth, desc, "prs_lf_records");
      depth++;

      /* check if we have anything to do first */
      
      if ( nk->num_subkeys == 0 )
            return True;

      /* move to the LF record */

      if ( !prs_set_offset( &hbin->ps, nk->subkeys_off + HBIN_HDR_SIZE - hbin->first_hbin_off ) )
            return False;

      /* backup and get the data_size */
      
      if ( !prs_set_offset( &hbin->ps, prs_offset(&hbin->ps)-sizeof(uint32)) )
            return False;
      start_off = prs_offset( &hbin->ps );
      if ( !prs_uint32( "rec_size", &hbin->ps, depth, &lf->rec_size ))
            return False;

      if ( !prs_uint8s( True, "header", &hbin->ps, depth, (uint8*)lf->header, sizeof( lf->header )) )
            return False;
            
      if ( !prs_uint16( "num_keys", &hbin->ps, depth, &lf->num_keys))
            return False;

      if ( UNMARSHALLING(&hbin->ps) ) {
            if (lf->num_keys) {
                  if ( !(lf->hashes = PRS_ALLOC_MEM( &hbin->ps, REGF_HASH_REC, lf->num_keys )) )
                        return False;
            } else {
                  lf->hashes = NULL;
            }
      }

      for ( i=0; i<lf->num_keys; i++ ) {
            if ( !prs_hash_rec( "hash_rec", &hbin->ps, depth, &lf->hashes[i] ) )
                  return False;
      }

      end_off = prs_offset( &hbin->ps );

      /* data_size must be divisible by 8 and large enough to hold the original record */

      data_size = ((start_off - end_off) & 0xfffffff8 );
      if ( data_size > lf->rec_size )
            DEBUG(10,("Encountered reused record (0x%x < 0x%x)\n", data_size, lf->rec_size));

      if ( MARSHALLING(&hbin->ps) )
            hbin->dirty = True;

      return True;
}

/*******************************************************************
*******************************************************************/

static bool hbin_prs_sk_rec( const char *desc, REGF_HBIN *hbin, int depth, REGF_SK_REC *sk )
{
      prs_struct *ps = &hbin->ps;
      uint16 tag = 0xFFFF;
      uint32 data_size, start_off, end_off;


      prs_debug(ps, depth, desc, "hbin_prs_sk_rec");
      depth++;

      if ( !prs_set_offset( &hbin->ps, sk->sk_off + HBIN_HDR_SIZE - hbin->first_hbin_off ) )
            return False;

      /* backup and get the data_size */
      
      if ( !prs_set_offset( &hbin->ps, prs_offset(&hbin->ps)-sizeof(uint32)) )
            return False;
      start_off = prs_offset( &hbin->ps );
      if ( !prs_uint32( "rec_size", &hbin->ps, depth, &sk->rec_size ))
            return False;

      if ( !prs_uint8s( True, "header", ps, depth, (uint8*)sk->header, sizeof( sk->header )) )
            return False;
      if ( !prs_uint16( "tag", ps, depth, &tag))
            return False;

      if ( !prs_uint32( "prev_sk_off", ps, depth, &sk->prev_sk_off))
            return False;
      if ( !prs_uint32( "next_sk_off", ps, depth, &sk->next_sk_off))
            return False;
      if ( !prs_uint32( "ref_count", ps, depth, &sk->ref_count))
            return False;
      if ( !prs_uint32( "size", ps, depth, &sk->size))
            return False;

      if ( !sec_io_desc( "sec_desc", &sk->sec_desc, ps, depth )) 
            return False;

      end_off = prs_offset( &hbin->ps );

      /* data_size must be divisible by 8 and large enough to hold the original record */

      data_size = ((start_off - end_off) & 0xfffffff8 );
      if ( data_size > sk->rec_size )
            DEBUG(10,("Encountered reused record (0x%x < 0x%x)\n", data_size, sk->rec_size));

      if ( MARSHALLING(&hbin->ps) )
            hbin->dirty = True;

      return True;
}

/*******************************************************************
*******************************************************************/

static bool hbin_prs_vk_rec( const char *desc, REGF_HBIN *hbin, int depth, REGF_VK_REC *vk, REGF_FILE *file )
{
      uint32 offset;
      uint16 name_length;
      prs_struct *ps = &hbin->ps;
      uint32 data_size, start_off, end_off;

      prs_debug(ps, depth, desc, "prs_vk_rec");
      depth++;

      /* backup and get the data_size */
      
      if ( !prs_set_offset( &hbin->ps, prs_offset(&hbin->ps)-sizeof(uint32)) )
            return False;
      start_off = prs_offset( &hbin->ps );
      if ( !prs_uint32( "rec_size", &hbin->ps, depth, &vk->rec_size ))
            return False;

      if ( !prs_uint8s( True, "header", ps, depth, (uint8*)vk->header, sizeof( vk->header )) )
            return False;

      if ( MARSHALLING(&hbin->ps) )
            name_length = strlen(vk->valuename);

      if ( !prs_uint16( "name_length", ps, depth, &name_length ))
            return False;
      if ( !prs_uint32( "data_size", ps, depth, &vk->data_size ))
            return False;
      if ( !prs_uint32( "data_off", ps, depth, &vk->data_off ))
            return False;
      if ( !prs_uint32( "type", ps, depth, &vk->type))
            return False;
      if ( !prs_uint16( "flag", ps, depth, &vk->flag))
            return False;

      offset = prs_offset( ps );
      offset += 2;      /* skip 2 bytes */
      prs_set_offset( ps, offset );

      /* get the name */

      if ( vk->flag&VK_FLAG_NAME_PRESENT ) {

            if ( UNMARSHALLING(&hbin->ps) ) {
                  if ( !(vk->valuename = PRS_ALLOC_MEM( ps, char, name_length+1 )))
                        return False;
            }
            if ( !prs_uint8s( True, "name", ps, depth, (uint8*)vk->valuename, name_length ) )
                  return False;
      }

      end_off = prs_offset( &hbin->ps );

      /* get the data if necessary */

      if ( vk->data_size != 0 ) {
            bool charmode = False;

            if ( (vk->type == REG_SZ) || (vk->type == REG_MULTI_SZ) )
                  charmode = True;

            /* the data is stored in the offset if the size <= 4 */

            if ( !(vk->data_size & VK_DATA_IN_OFFSET) ) {
                  REGF_HBIN *hblock = hbin;
                  uint32 data_rec_size;

                  if ( UNMARSHALLING(&hbin->ps) ) {
                        if ( !(vk->data = PRS_ALLOC_MEM( ps, uint8, vk->data_size) ) )
                              return False;
                  }

                  /* this data can be in another hbin */
                  if ( !hbin_contains_offset( hbin, vk->data_off ) ) {
                        if ( !(hblock = lookup_hbin_block( file, vk->data_off )) )
                              return False;
                  }
                  if ( !(prs_set_offset( &hblock->ps, (vk->data_off+HBIN_HDR_SIZE-hblock->first_hbin_off)-sizeof(uint32) )) )
                        return False;

                  if ( MARSHALLING(&hblock->ps) ) {
                        data_rec_size = ( (vk->data_size+sizeof(uint32)) & 0xfffffff8 ) + 8;
                        data_rec_size = ( data_rec_size - 1 ) ^ 0xFFFFFFFF;
                  }
                  if ( !prs_uint32( "data_rec_size", &hblock->ps, depth, &data_rec_size ))
                        return False;
                  if ( !prs_uint8s( charmode, "data", &hblock->ps, depth, vk->data, vk->data_size) )
                        return False;

                  if ( MARSHALLING(&hblock->ps) )
                        hblock->dirty = True;
            }
            else {
                  if ( !(vk->data = PRS_ALLOC_MEM( ps, uint8, 4 ) ) )
                        return False;
                  SIVAL( vk->data, 0, vk->data_off );
            }
            
      }

      /* data_size must be divisible by 8 and large enough to hold the original record */

      data_size = ((start_off - end_off ) & 0xfffffff8 );
      if ( data_size !=  vk->rec_size )
            DEBUG(10,("prs_vk_rec: data_size check failed (0x%x < 0x%x)\n", data_size, vk->rec_size));

      if ( MARSHALLING(&hbin->ps) )
            hbin->dirty = True;

      return True;
}

/*******************************************************************
 read a VK record which is contained in the HBIN block stored 
 in the prs_struct *ps.
*******************************************************************/

static bool hbin_prs_vk_records( const char *desc, REGF_HBIN *hbin, int depth, REGF_NK_REC *nk, REGF_FILE *file )
{
      int i;
      uint32 record_size;

      prs_debug(&hbin->ps, depth, desc, "prs_vk_records");
      depth++;
      
      /* check if we have anything to do first */
      
      if ( nk->num_values == 0 )
            return True;
            
      if ( UNMARSHALLING(&hbin->ps) ) {
            if ( !(nk->values = PRS_ALLOC_MEM( &hbin->ps, REGF_VK_REC, nk->num_values ) ) )
                  return False;
      }
      
      /* convert the offset to something relative to this HBIN block */
      
      if ( !prs_set_offset( &hbin->ps, nk->values_off+HBIN_HDR_SIZE-hbin->first_hbin_off-sizeof(uint32)) )
            return False;

      if ( MARSHALLING( &hbin->ps) ) { 
            record_size = ( ( nk->num_values * sizeof(uint32) ) & 0xfffffff8 ) + 8;
            record_size = (record_size - 1) ^ 0xFFFFFFFF;
      }

      if ( !prs_uint32( "record_size", &hbin->ps, depth, &record_size ) )
            return False;
            
      for ( i=0; i<nk->num_values; i++ ) {
            if ( !prs_uint32( "vk_off", &hbin->ps, depth, &nk->values[i].rec_off ) )
                  return False;
      }

      for ( i=0; i<nk->num_values; i++ ) {
            REGF_HBIN *sub_hbin = hbin;
            uint32 new_offset;
      
            if ( !hbin_contains_offset( hbin, nk->values[i].rec_off ) ) {
                  sub_hbin = lookup_hbin_block( file, nk->values[i].rec_off );
                  if ( !sub_hbin ) {
                        DEBUG(0,("hbin_prs_vk_records: Failed to find HBIN block containing offset [0x%x]\n", 
                              nk->values[i].hbin_off));
                        return False;
                  }
            }
            
            new_offset = nk->values[i].rec_off + HBIN_HDR_SIZE - sub_hbin->first_hbin_off;
            if ( !prs_set_offset( &sub_hbin->ps, new_offset ) )
                  return False;
            if ( !hbin_prs_vk_rec( "vk_rec", sub_hbin, depth, &nk->values[i], file ) )
                  return False;
      }

      if ( MARSHALLING(&hbin->ps) )
            hbin->dirty = True;


      return True;
}


/*******************************************************************
*******************************************************************/

static REGF_SK_REC* find_sk_record_by_offset( REGF_FILE *file, uint32 offset )
{
      REGF_SK_REC *p_sk;
      
      for ( p_sk=file->sec_desc_list; p_sk; p_sk=p_sk->next ) {
            if ( p_sk->sk_off == offset ) 
                  return p_sk;
      }
      
      return NULL;
}

/*******************************************************************
*******************************************************************/

static REGF_SK_REC* find_sk_record_by_sec_desc( REGF_FILE *file, SEC_DESC *sd )
{
      REGF_SK_REC *p;

      for ( p=file->sec_desc_list; p; p=p->next ) {
            if ( sec_desc_equal( p->sec_desc, sd ) )
                  return p;
      }

      /* failure */

      return NULL;
}

/*******************************************************************
*******************************************************************/

static bool hbin_prs_key( REGF_FILE *file, REGF_HBIN *hbin, REGF_NK_REC *nk )
{
      int depth = 0;
      REGF_HBIN *sub_hbin;
      
      prs_debug(&hbin->ps, depth, "", "fetch_key");
      depth++;

      /* get the initial nk record */
      
      if ( !prs_nk_rec( "nk_rec", &hbin->ps, depth, nk ))
            return False;

      /* fill in values */
      
      if ( nk->num_values && (nk->values_off!=REGF_OFFSET_NONE) ) {
            sub_hbin = hbin;
            if ( !hbin_contains_offset( hbin, nk->values_off ) ) {
                  sub_hbin = lookup_hbin_block( file, nk->values_off );
                  if ( !sub_hbin ) {
                        DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing value_list_offset [0x%x]\n", 
                              nk->values_off));
                        return False;
                  }
            }
            
            if ( !hbin_prs_vk_records( "vk_rec", sub_hbin, depth, nk, file ))
                  return False;
      }
            
      /* now get subkeys */
      
      if ( nk->num_subkeys && (nk->subkeys_off!=REGF_OFFSET_NONE) ) {
            sub_hbin = hbin;
            if ( !hbin_contains_offset( hbin, nk->subkeys_off ) ) {
                  sub_hbin = lookup_hbin_block( file, nk->subkeys_off );
                  if ( !sub_hbin ) {
                        DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing subkey_offset [0x%x]\n", 
                              nk->subkeys_off));
                        return False;
                  }
            }
            
            if ( !hbin_prs_lf_records( "lf_rec", sub_hbin, depth, nk ))
                  return False;
      }

      /* get the to the security descriptor.  First look if we have already parsed it */
      
      if ( (nk->sk_off!=REGF_OFFSET_NONE) && !( nk->sec_desc = find_sk_record_by_offset( file, nk->sk_off )) ) {

            sub_hbin = hbin;
            if ( !hbin_contains_offset( hbin, nk->sk_off ) ) {
                  sub_hbin = lookup_hbin_block( file, nk->sk_off );
                  if ( !sub_hbin ) {
                        DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing sk_offset [0x%x]\n", 
                              nk->subkeys_off));
                        return False;
                  }
            }
            
            if ( !(nk->sec_desc = TALLOC_ZERO_P( file->mem_ctx, REGF_SK_REC )) )
                  return False;
            nk->sec_desc->sk_off = nk->sk_off;
            if ( !hbin_prs_sk_rec( "sk_rec", sub_hbin, depth, nk->sec_desc ))
                  return False;
                  
            /* add to the list of security descriptors (ref_count has been read from the files) */

            nk->sec_desc->sk_off = nk->sk_off;
            DLIST_ADD( file->sec_desc_list, nk->sec_desc );
      }
            
      return True;
}

/*******************************************************************
*******************************************************************/

static bool next_record( REGF_HBIN *hbin, const char *hdr, bool *eob )
{
      uint8 header[REC_HDR_SIZE];
      uint32 record_size;
      uint32 curr_off, block_size;
      bool found = False;
      prs_struct *ps = &hbin->ps;
      
      curr_off = prs_offset( ps );
      if ( curr_off == 0 )
            prs_set_offset( ps, HBIN_HEADER_REC_SIZE );

      /* assume that the current offset is at the record header 
         and we need to backup to read the record size */

      curr_off -= sizeof(uint32);

      block_size = prs_data_size( ps );
      record_size = 0;
      memset( header, 0x0, sizeof(uint8)*REC_HDR_SIZE );
      while ( !found ) {

            curr_off = curr_off+record_size;
            if ( curr_off >= block_size ) 
                  break;

            if ( !prs_set_offset( &hbin->ps, curr_off) )
                  return False;

            if ( !prs_uint32( "record_size", ps, 0, &record_size ) )
                  return False;
            if ( !prs_uint8s( True, "header", ps, 0, header, REC_HDR_SIZE ) )
                  return False;

            if ( record_size & 0x80000000 ) {
                  /* absolute_value(record_size) */
                  record_size = (record_size ^ 0xffffffff) + 1;
            }

            if ( memcmp( header, hdr, REC_HDR_SIZE ) == 0 ) {
                  found = True;
                  curr_off += sizeof(uint32);
            }
      } 

      /* mark prs_struct as done ( at end ) if no more SK records */
      /* mark end-of-block as True */
      
      if ( !found ) {
            prs_set_offset( &hbin->ps, prs_data_size(&hbin->ps) );
            *eob = True;
            return False;
      }
            
      if ( !prs_set_offset( ps, curr_off ) )
            return False;

      return True;
}

/*******************************************************************
*******************************************************************/

static bool next_nk_record( REGF_FILE *file, REGF_HBIN *hbin, REGF_NK_REC *nk, bool *eob )
{
      if ( next_record( hbin, "nk", eob ) && hbin_prs_key( file, hbin, nk ) )
            return True;
      
      return False;
}

/*******************************************************************
 Intialize the newly created REGF_BLOCK in *file and write the 
 block header to disk 
*******************************************************************/

static bool init_regf_block( REGF_FILE *file )
{     
      prs_struct ps;
      bool result = True;
      
      if ( !prs_init( &ps, REGF_BLOCKSIZE, file->mem_ctx, MARSHALL ) )
            return False;
            
      memcpy( file->header, "regf", REGF_HDR_SIZE );
      file->data_offset = 0x20;
      file->last_block  = 0x1000;
      
      /* set mod time */
      
      unix_to_nt_time( &file->mtime, time(NULL) );
      
      /* hard coded values...no diea what these are ... maybe in time */
      
      file->unknown1 = 0x2;
      file->unknown2 = 0x1;
      file->unknown3 = 0x3;
      file->unknown4 = 0x0;
      file->unknown5 = 0x1;
      file->unknown6 = 0x1;
      
      /* write header to the buffer */
      
      if ( !prs_regf_block( "regf_header", &ps, 0, file ) ) {
            result = False;
            goto out;
      }
      
      /* calculate the checksum, re-marshall data (to include the checksum) 
         and write to disk */
      
      file->checksum = regf_block_checksum( &ps );
      prs_set_offset( &ps, 0 );
      if ( !prs_regf_block( "regf_header", &ps, 0, file ) ) {
            result = False;
            goto out;
      }
            
      if ( write_block( file, &ps, 0 ) == -1 ) {
            DEBUG(0,("init_regf_block: Failed to initialize registry header block!\n"));
            result = False;
            goto out;
      }
      
out:
      prs_mem_free( &ps );

      return result;
}
/*******************************************************************
 Open the registry file and then read in the REGF block to get the 
 first hbin offset.
*******************************************************************/

 REGF_FILE* regfio_open( const char *filename, int flags, int mode )
{
      REGF_FILE *rb;
      
      if ( !(rb = SMB_MALLOC_P(REGF_FILE)) ) {
            DEBUG(0,("ERROR allocating memory\n"));
            return NULL;
      }
      ZERO_STRUCTP( rb );
      rb->fd = -1;
      
      if ( !(rb->mem_ctx = talloc_init( "read_regf_block" )) ) {
            regfio_close( rb );
            SAFE_FREE(rb);
            return NULL;
      }

      rb->open_flags = flags;
      
      /* open and existing file */

      if ( (rb->fd = open(filename, flags, mode)) == -1 ) {
            DEBUG(0,("regfio_open: failure to open %s (%s)\n", filename, strerror(errno)));
            regfio_close( rb );
            SAFE_FREE(rb);
            return NULL;
      }
      
      /* check if we are creating a new file or overwriting an existing one */
            
      if ( flags & (O_CREAT|O_TRUNC) ) {
            if ( !init_regf_block( rb ) ) {
                  DEBUG(0,("regfio_open: Failed to read initial REGF block\n"));
                  regfio_close( rb );
                  SAFE_FREE(rb);
                  return NULL;
            }
            
            /* success */
            return rb;
      }
      
      /* read in an existing file */
      
      if ( !read_regf_block( rb ) ) {
            DEBUG(0,("regfio_open: Failed to read initial REGF block\n"));
            regfio_close( rb );
            SAFE_FREE(rb);
            return NULL;
      }
      
      /* success */
      
      return rb;
}

/*******************************************************************
*******************************************************************/

static void regfio_mem_free( REGF_FILE *file )
{
      /* free any talloc()'d memory */
      
      if ( file && file->mem_ctx )
            talloc_destroy( file->mem_ctx );    
}

/*******************************************************************
*******************************************************************/

 int regfio_close( REGF_FILE *file )
{
      int fd;

      /* cleanup for a file opened for write */

      if ((file->fd != -1) && (file->open_flags & (O_WRONLY|O_RDWR))) {
            prs_struct ps;
            REGF_SK_REC *sk;

            /* write of sd list */

            for ( sk=file->sec_desc_list; sk; sk=sk->next ) {
                  hbin_prs_sk_rec( "sk_rec", sk->hbin, 0, sk );
            }

            /* flush any dirty blocks */

            while ( file->block_list ) {
                  hbin_block_close( file, file->block_list );
            } 

            ZERO_STRUCT( ps );

            unix_to_nt_time( &file->mtime, time(NULL) );

            if ( read_block( file, &ps, 0, REGF_BLOCKSIZE ) != -1 ) {
                  /* now use for writing */
                  prs_switch_type( &ps, MARSHALL );

                  /* stream the block once, generate the checksum, 
                     and stream it again */
                  prs_set_offset( &ps, 0 );
                  prs_regf_block( "regf_blocK", &ps, 0, file );
                  file->checksum = regf_block_checksum( &ps );
                  prs_set_offset( &ps, 0 );
                  prs_regf_block( "regf_blocK", &ps, 0, file );

                  /* now we are ready to write it to disk */
                  if ( write_block( file, &ps, 0 ) == -1 )
                        DEBUG(0,("regfio_close: failed to update the regf header block!\n"));
            }

            prs_mem_free( &ps );
      }
      
      regfio_mem_free( file );

      /* nothing tdo do if there is no open file */

      if ( !file || (file->fd == -1) )
            return 0;
            
      fd = file->fd;
      file->fd = -1;
      SAFE_FREE( file );

      return close( fd );
}

/*******************************************************************
*******************************************************************/

static void regfio_flush( REGF_FILE *file )
{
      REGF_HBIN *hbin;

      for ( hbin=file->block_list; hbin; hbin=hbin->next ) {
            write_hbin_block( file, hbin );
      }
}

/*******************************************************************
 There should be only *one* root key in the registry file based 
 on my experience.  --jerry
*******************************************************************/

REGF_NK_REC* regfio_rootkey( REGF_FILE *file )
{
      REGF_NK_REC *nk;
      REGF_HBIN   *hbin;
      uint32      offset = REGF_BLOCKSIZE;
      bool        found = False;
      bool        eob;
      
      if ( !file )
            return NULL;
            
      if ( !(nk = TALLOC_ZERO_P( file->mem_ctx, REGF_NK_REC )) ) {
            DEBUG(0,("regfio_rootkey: talloc() failed!\n"));
            return NULL;
      }
      
      /* scan through the file on HBIN block at a time looking 
         for an NK record with a type == 0x002c.
         Normally this is the first nk record in the first hbin 
         block (but I'm not assuming that for now) */
      
      while ( (hbin = read_hbin_block( file, offset )) ) {
            eob = False;

            while ( !eob) {
                  if ( next_nk_record( file, hbin, nk, &eob ) ) {
                        if ( nk->key_type == NK_TYPE_ROOTKEY ) {
                              found = True;
                              break;
                        }
                  }
                  prs_mem_free( &hbin->ps );
            }
            
            if ( found ) 
                  break;

            offset += hbin->block_size;
      }
      
      if ( !found ) {
            DEBUG(0,("regfio_rootkey: corrupt registry file ?  No root key record located\n"));
            return NULL;
      }

      DLIST_ADD( file->block_list, hbin );

      return nk;        
}

/*******************************************************************
 This acts as an interator over the subkeys defined for a given 
 NK record.  Remember that offsets are from the *first* HBIN block.
*******************************************************************/

 REGF_NK_REC* regfio_fetch_subkey( REGF_FILE *file, REGF_NK_REC *nk )
{
      REGF_NK_REC *subkey;
      REGF_HBIN   *hbin;
      uint32      nk_offset;

      /* see if there is anything left to report */
      
      if ( !nk || (nk->subkeys_off==REGF_OFFSET_NONE) || (nk->subkey_index >= nk->num_subkeys) )
            return NULL;

      /* find the HBIN block which should contain the nk record */
      
      if ( !(hbin = lookup_hbin_block( file, nk->subkeys.hashes[nk->subkey_index].nk_off )) ) {
            DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing offset [0x%x]\n", 
                  nk->subkeys.hashes[nk->subkey_index].nk_off));
            return NULL;
      }
      
      nk_offset = nk->subkeys.hashes[nk->subkey_index].nk_off;
      if ( !prs_set_offset( &hbin->ps, (HBIN_HDR_SIZE + nk_offset - hbin->first_hbin_off) ) )
            return NULL;
            
      nk->subkey_index++;
      if ( !(subkey = TALLOC_ZERO_P( file->mem_ctx, REGF_NK_REC )) )
            return NULL;
            
      if ( !hbin_prs_key( file, hbin, subkey ) )
            return NULL;
      
      return subkey;
}


/*******************************************************************
*******************************************************************/

static REGF_HBIN* regf_hbin_allocate( REGF_FILE *file, uint32 block_size )
{
      REGF_HBIN *hbin;
      SMB_STRUCT_STAT sbuf;

      if ( !(hbin = TALLOC_ZERO_P( file->mem_ctx, REGF_HBIN )) )
            return NULL;

      memcpy( hbin->header, "hbin", sizeof(HBIN_HDR_SIZE) );


      if ( sys_fstat( file->fd, &sbuf ) ) {
            DEBUG(0,("regf_hbin_allocate: stat() failed! (%s)\n", strerror(errno)));
            return NULL;
      }

      hbin->file_off       = sbuf.st_size;

      hbin->free_off       = HBIN_HEADER_REC_SIZE;
      hbin->free_size      = block_size - hbin->free_off + sizeof(uint32);;

      hbin->block_size     = block_size;
      hbin->first_hbin_off = hbin->file_off - REGF_BLOCKSIZE;

      if ( !prs_init( &hbin->ps, block_size, file->mem_ctx, MARSHALL ) )
            return NULL;

      if ( !prs_hbin_block( "new_hbin", &hbin->ps, 0, hbin ) )
            return NULL;

      if ( !write_hbin_block( file, hbin ) )
            return NULL;

      file->last_block = hbin->file_off;

      return hbin;
}

/*******************************************************************
*******************************************************************/

static void update_free_space( REGF_HBIN *hbin, uint32 size_used )
{
      hbin->free_off  += size_used;
      hbin->free_size -= size_used;

      if ( hbin->free_off >= hbin->block_size ) {
            hbin->free_off = REGF_OFFSET_NONE;
      }

      return;
}

/*******************************************************************
*******************************************************************/

static REGF_HBIN* find_free_space( REGF_FILE *file, uint32 size )
{
      REGF_HBIN *hbin, *p_hbin;
      uint32 block_off;
      bool cached;

      /* check open block list */

      for ( hbin=file->block_list; hbin!=NULL; hbin=hbin->next ) {
            /* only check blocks that actually have available space */

            if ( hbin->free_off == REGF_OFFSET_NONE )
                  continue;

            /* check for a large enough available chunk */

            if ( (hbin->block_size - hbin->free_off) >= size ) {
                  DLIST_PROMOTE( file->block_list, hbin );
                  goto done;              
            }
      }

      /* parse the file until we find a block with 
         enough free space; save the last non-filled hbin */

      block_off = REGF_BLOCKSIZE;
      do {
            /* cleanup before the next round */
            cached = False;
            if ( hbin )
                  prs_mem_free( &hbin->ps );

            hbin = read_hbin_block( file, block_off );

            if ( hbin ) {

                  /* make sure that we don't already have this block in memory */

                  for ( p_hbin=file->block_list; p_hbin!=NULL; p_hbin=p_hbin->next ) {
                        if ( p_hbin->file_off == hbin->file_off ) {
                              cached = True;    
                              break;
                        }
                  }

                  block_off = hbin->file_off + hbin->block_size;

                  if ( cached ) {
                        prs_mem_free( &hbin->ps );
                        hbin = NULL;
                        continue;
                  }
            }
      /* if (cached block or (new block and not enough free space)) then continue looping */
      } while ( cached || (hbin && (hbin->free_size < size)) );
      
      /* no free space; allocate a new one */

      if ( !hbin ) {
            uint32 alloc_size;

            /* allocate in multiples of REGF_ALLOC_BLOCK; make sure (size + hbin_header) fits */

            alloc_size = (((size+HBIN_HEADER_REC_SIZE) / REGF_ALLOC_BLOCK ) + 1 ) * REGF_ALLOC_BLOCK;

            if ( !(hbin = regf_hbin_allocate( file, alloc_size )) ) {
                  DEBUG(0,("find_free_space: regf_hbin_allocate() failed!\n"));
                  return NULL;
            }
            DLIST_ADD( file->block_list, hbin );
      }

done:
      /* set the offset to be ready to write */

      if ( !prs_set_offset( &hbin->ps, hbin->free_off-sizeof(uint32) ) )
            return NULL;

      /* write the record size as a placeholder for now, it should be
         probably updated by the caller once it all of the data necessary 
         for the record */

      if ( !prs_uint32("allocated_size", &hbin->ps, 0, &size) )
            return False;

      update_free_space( hbin, size );
      
      return hbin;
}

/*******************************************************************
*******************************************************************/

static uint32 sk_record_data_size( SEC_DESC * sd )
{
      uint32 size, size_mod8;

      size_mod8 = 0;

      /* the record size is sizeof(hdr) + name + static members + data_size_field */

      size = sizeof(uint32)*5 + ndr_size_security_descriptor(sd, 0) + sizeof(uint32);

      /* multiple of 8 */
      size_mod8 = size & 0xfffffff8;
      if ( size_mod8 < size )
            size_mod8 += 8;

      return size_mod8;
}

/*******************************************************************
*******************************************************************/

static uint32 vk_record_data_size( REGF_VK_REC *vk )
{
      uint32 size, size_mod8;

      size_mod8 = 0;

      /* the record size is sizeof(hdr) + name + static members + data_size_field */

      size = REC_HDR_SIZE + (sizeof(uint16)*3) + (sizeof(uint32)*3) + sizeof(uint32);

      if ( vk->valuename )
            size += strlen(vk->valuename);

      /* multiple of 8 */
      size_mod8 = size & 0xfffffff8;
      if ( size_mod8 < size )
            size_mod8 += 8;

      return size_mod8;
}

/*******************************************************************
*******************************************************************/

static uint32 lf_record_data_size( uint32 num_keys )
{
      uint32 size, size_mod8;

      size_mod8 = 0;

      /* the record size is sizeof(hdr) + num_keys + sizeof of hash_array + data_size_uint32 */

      size = REC_HDR_SIZE + sizeof(uint16) + (sizeof(REGF_HASH_REC) * num_keys) + sizeof(uint32);

      /* multiple of 8 */
      size_mod8 = size & 0xfffffff8;
      if ( size_mod8 < size )
            size_mod8 += 8;

      return size_mod8;
}

/*******************************************************************
*******************************************************************/

static uint32 nk_record_data_size( REGF_NK_REC *nk )
{
      uint32 size, size_mod8;

      size_mod8 = 0;

      /* the record size is static + length_of_keyname + length_of_classname + data_size_uint32 */

      size = 0x4c + strlen(nk->keyname) + sizeof(uint32);

      if ( nk->classname )
            size += strlen( nk->classname );

      /* multiple of 8 */
      size_mod8 = size & 0xfffffff8;
      if ( size_mod8 < size )
            size_mod8 += 8;

      return size_mod8;
}

/*******************************************************************
*******************************************************************/

static bool create_vk_record( REGF_FILE *file, REGF_VK_REC *vk, REGISTRY_VALUE *value )
{
      char *name = regval_name(value);
      REGF_HBIN *data_hbin;

      ZERO_STRUCTP( vk );

      memcpy( vk->header, "vk", REC_HDR_SIZE );

      if ( name ) {
            vk->valuename = talloc_strdup( file->mem_ctx, regval_name(value) );
            vk->flag = VK_FLAG_NAME_PRESENT;
      }

      vk->data_size = regval_size( value );
      vk->type      = regval_type( value );

      if ( vk->data_size > sizeof(uint32) ) {
            uint32 data_size = ( (vk->data_size+sizeof(uint32)) & 0xfffffff8 ) + 8;

            vk->data = (uint8 *)TALLOC_MEMDUP( file->mem_ctx,
                                       regval_data_p(value),
                                       vk->data_size );
            if (vk->data == NULL) {
                  return False;
            }

            /* go ahead and store the offset....we'll pick this hbin block back up when 
               we stream the data */

            if ((data_hbin = find_free_space(file, data_size )) == NULL) {
                  return False;
            }
            vk->data_off = prs_offset( &data_hbin->ps ) + data_hbin->first_hbin_off - HBIN_HDR_SIZE;
      }
      else {
            /* make sure we don't try to copy from a NULL value pointer */

            if ( vk->data_size != 0 ) 
                  memcpy( &vk->data_off, regval_data_p(value), sizeof(uint32) );
            vk->data_size |= VK_DATA_IN_OFFSET;       
      }

      return True;
}

/*******************************************************************
*******************************************************************/

static int hashrec_cmp( REGF_HASH_REC *h1, REGF_HASH_REC *h2 )
{
      return StrCaseCmp( h1->fullname, h2->fullname );
}

/*******************************************************************
*******************************************************************/

 REGF_NK_REC* regfio_write_key( REGF_FILE *file, const char *name, 
                               REGVAL_CTR *values, REGSUBKEY_CTR *subkeys, 
                               SEC_DESC *sec_desc, REGF_NK_REC *parent )
{
      REGF_NK_REC *nk;
      REGF_HBIN *vlist_hbin = NULL;
      uint32 size;

      if ( !(nk = TALLOC_ZERO_P( file->mem_ctx, REGF_NK_REC )) )
            return NULL;

      memcpy( nk->header, "nk", REC_HDR_SIZE );

      if ( !parent )
            nk->key_type = NK_TYPE_ROOTKEY;
      else
            nk->key_type = NK_TYPE_NORMALKEY;

      /* store the parent offset (or -1 if a the root key */

      nk->parent_off = parent ? (parent->hbin_off + parent->hbin->file_off - REGF_BLOCKSIZE - HBIN_HDR_SIZE ) : REGF_OFFSET_NONE;

      /* no classname currently */

      nk->classname_off = REGF_OFFSET_NONE;
      nk->classname = NULL;
      nk->keyname = talloc_strdup( file->mem_ctx, name );

      /* current modification time */

      unix_to_nt_time( &nk->mtime, time(NULL) );

      /* allocate the record on disk */

      size = nk_record_data_size( nk );
      nk->rec_size = ( size - 1 ) ^ 0XFFFFFFFF;
      if ((nk->hbin = find_free_space( file, size )) == NULL) {
            return NULL;
      }
      nk->hbin_off = prs_offset( &nk->hbin->ps );

      /* Update the hash record in the parent */
      
      if ( parent ) {
            REGF_HASH_REC *hash = &parent->subkeys.hashes[parent->subkey_index];

            hash->nk_off = prs_offset( &nk->hbin->ps ) + nk->hbin->first_hbin_off - HBIN_HDR_SIZE;
            memcpy( hash->keycheck, name, sizeof(uint32) );
            hash->fullname = talloc_strdup( file->mem_ctx, name );
            parent->subkey_index++;

            /* sort the list by keyname */

            qsort( parent->subkeys.hashes, parent->subkey_index, sizeof(REGF_HASH_REC), QSORT_CAST hashrec_cmp );

            if ( !hbin_prs_lf_records( "lf_rec", parent->subkeys.hbin, 0, parent ) )
                  return False;
      }

      /* write the security descriptor */

      nk->sk_off = REGF_OFFSET_NONE;
      if ( sec_desc ) {
            uint32 sk_size = sk_record_data_size( sec_desc );
            REGF_HBIN *sk_hbin;

            /* search for it in the existing list of sd's */

            if ( (nk->sec_desc = find_sk_record_by_sec_desc( file, sec_desc )) == NULL ) {
                  /* not found so add it to the list */

                  if (!(sk_hbin = find_free_space( file, sk_size ))) {
                        return NULL;
                  }

                  if ( !(nk->sec_desc = TALLOC_ZERO_P( file->mem_ctx, REGF_SK_REC )) )
                        return NULL;
      
                  /* now we have to store the security descriptor in the list and 
                     update the offsets */

                  memcpy( nk->sec_desc->header, "sk", REC_HDR_SIZE );
                  nk->sec_desc->hbin      = sk_hbin;
                  nk->sec_desc->hbin_off  = prs_offset( &sk_hbin->ps );
                  nk->sec_desc->sk_off    = prs_offset( &sk_hbin->ps ) + sk_hbin->first_hbin_off - HBIN_HDR_SIZE;
                  nk->sec_desc->rec_size  = (sk_size-1)  ^ 0xFFFFFFFF;

                  nk->sec_desc->sec_desc  = sec_desc;
                  nk->sec_desc->ref_count = 0;
                  
                  /* size value must be self-inclusive */
                  nk->sec_desc->size      = ndr_size_security_descriptor(sec_desc, 0)
                        + sizeof(uint32);

                  DLIST_ADD_END( file->sec_desc_list, nk->sec_desc, REGF_SK_REC *);

                  /* update the offsets for us and the previous sd in the list.
                     if this is the first record, then just set the next and prev
                     offsets to ourself. */

                  if ( nk->sec_desc->prev ) {
                        REGF_SK_REC *prev = nk->sec_desc->prev;

                        nk->sec_desc->prev_sk_off = prev->hbin_off + prev->hbin->first_hbin_off - HBIN_HDR_SIZE;
                        prev->next_sk_off = nk->sec_desc->sk_off;

                        /* the end must loop around to the front */
                        nk->sec_desc->next_sk_off = file->sec_desc_list->sk_off;

                        /* and first must loop around to the tail */
                        file->sec_desc_list->prev_sk_off = nk->sec_desc->sk_off;
                  } else {
                        nk->sec_desc->prev_sk_off = nk->sec_desc->sk_off;
                        nk->sec_desc->next_sk_off = nk->sec_desc->sk_off;
                  }
            }

            /* bump the reference count +1 */

            nk->sk_off = nk->sec_desc->sk_off;
            nk->sec_desc->ref_count++;
      }

      /* write the subkeys */

      nk->subkeys_off = REGF_OFFSET_NONE;
      if ( (nk->num_subkeys = regsubkey_ctr_numkeys( subkeys )) != 0 ) {
            uint32 lf_size = lf_record_data_size( nk->num_subkeys );
            uint32 namelen;
            int i;
            
            if (!(nk->subkeys.hbin = find_free_space( file, lf_size ))) {
                  return NULL;
            }
            nk->subkeys.hbin_off = prs_offset( &nk->subkeys.hbin->ps );
            nk->subkeys.rec_size = (lf_size-1) ^ 0xFFFFFFFF;
            nk->subkeys_off = prs_offset( &nk->subkeys.hbin->ps ) + nk->subkeys.hbin->first_hbin_off - HBIN_HDR_SIZE;

            memcpy( nk->subkeys.header, "lf", REC_HDR_SIZE );
            
            nk->subkeys.num_keys = nk->num_subkeys;
            if (nk->subkeys.num_keys) {
                  if ( !(nk->subkeys.hashes = TALLOC_ZERO_ARRAY( file->mem_ctx, REGF_HASH_REC, nk->subkeys.num_keys )) )
                        return NULL;
            } else {
                  nk->subkeys.hashes = NULL;
            }
            nk->subkey_index = 0;

            /* update the max_bytes_subkey{name,classname} fields */
            for ( i=0; i<nk->num_subkeys; i++ ) {
                  namelen = strlen( regsubkey_ctr_specific_key(subkeys, i) );
                  if ( namelen*2 > nk->max_bytes_subkeyname )
                        nk->max_bytes_subkeyname = namelen * 2;
            }
      }

      /* write the values */

      nk->values_off = REGF_OFFSET_NONE;
      if ( (nk->num_values = regval_ctr_numvals( values )) != 0 ) {
            uint32 vlist_size = ( ( nk->num_values * sizeof(uint32) ) & 0xfffffff8 ) + 8;
            int i;
            
            if (!(vlist_hbin = find_free_space( file, vlist_size ))) {
                  return NULL;
            }
            nk->values_off = prs_offset( &vlist_hbin->ps ) + vlist_hbin->first_hbin_off - HBIN_HDR_SIZE;
      
            if (nk->num_values) {
                  if ( !(nk->values = TALLOC_ARRAY( file->mem_ctx, REGF_VK_REC, nk->num_values )) )
                        return NULL;
            } else {
                  nk->values = NULL;
            }

            /* create the vk records */

            for ( i=0; i<nk->num_values; i++ ) {
                  uint32 vk_size, namelen, datalen;
                  REGISTRY_VALUE *r;

                  r = regval_ctr_specific_value( values, i );
                  create_vk_record( file, &nk->values[i], r );
                  vk_size = vk_record_data_size( &nk->values[i] );
                  nk->values[i].hbin = find_free_space( file, vk_size );
                  nk->values[i].hbin_off = prs_offset( &nk->values[i].hbin->ps );
                  nk->values[i].rec_size = ( vk_size - 1 ) ^ 0xFFFFFFFF;
                  nk->values[i].rec_off = prs_offset( &nk->values[i].hbin->ps ) 
                        + nk->values[i].hbin->first_hbin_off 
                        - HBIN_HDR_SIZE;

                  /* update the max bytes fields if necessary */

                  namelen = strlen( regval_name(r) );
                  if ( namelen*2 > nk->max_bytes_valuename )
                        nk->max_bytes_valuename = namelen * 2;

                  datalen = regval_size( r );
                  if ( datalen > nk->max_bytes_value )
                        nk->max_bytes_value = datalen;
            }
      }

      /* stream the records */      
      
      prs_set_offset( &nk->hbin->ps, nk->hbin_off );
      if ( !prs_nk_rec( "nk_rec", &nk->hbin->ps, 0, nk ) )
            return False;

      if ( nk->num_values ) {
            if ( !hbin_prs_vk_records( "vk_records", vlist_hbin, 0, nk, file ) )
                  return False;
      }


      regfio_flush( file );

      return nk;
}


Generated by  Doxygen 1.6.0   Back to index