Listing 2.4b: SMB_Header.c
SMB Header [De]Construction

/* ------------------------------------------------------ **
 * smb_header.c
 * ------------------------------------------------------ **
 */

#include "smb_header.h"

const char *smb_hdrSMBString = "\xFFSMB";

int smb_hdrInit( uchar *bufr, int bsize )
  /* ---------------------------------------------------- **
   * Initialize an empty header structure.
   * Returns -1 on error, the SMB header size on success.
   * ---------------------------------------------------- **
   */
  {
  int i;

  if( bsize < SMB_HDR_SIZE )
    return( -1 );

  for( i = 0; i < 4; i++ )
    bufr[i] = smb_hdrSMBString[i];
  for( i = 4; i < SMB_HDR_SIZE; i++ )
    bufr[i] = '\0';

  return( SMB_HDR_SIZE );
  } /* smb_hdrInit */


int smb_hdrCheck( uchar *bufr, int bsize )
  /* ---------------------------------------------------- **
   * Perform some quick checks on a received buffer to
   * make sure it's safe to read.  This function returns
   * a negative value if the SMB header is invalid.
   * ---------------------------------------------------- **
   */
  {
  int i;

  if( NULL == bufr )
    return( -1 );

  if( bsize < SMB_HDR_SIZE )
    return( -2 );

  for( i = 0; i < 4; i++ )
    if( bufr[i] != smb_hdrSMBString[i] )
      return( -3 );

  return( SMB_HDR_SIZE );
  } /* smb_hdrCheck */

$Revision: 1.2 $ $Date: 2002/11/18 02:15:54 $

Copyright © 2002 Christopher R. Hertel  Released under the terms of the LGPL