PARTITION HIDING SOFTWARE IN C

PARTITION HIDING SOFTWARE IN C


 /* program to read the partition table of hard disk and can hide and
 revele partitions*/
 #include<stdio.h>
 #include<bios.h>
 #include<dos.h>
 #include<stdlib.h>
 typedef unsigned char BYTE;
 typedef unsigned int WORD;
 typedef unsigned long DWORD;
 enum BOOL {TRUE=0,FALSE=1};
 struct PARTITIONINFO {
  BYTE bootid;   /* bootable?  0=no, 128=yes  */
  BYTE beghead;  /* beginning head number */
  BYTE begsect;  /* beginning sector number */
  BYTE begcyl;   /* 10 bit nmbr, with high 2 bits put in begsect */
  BYTE systid;   /* Operating System type indicator code */
  BYTE endhead;  /* ending head number */
  BYTE endsect;  /* ending sector number */
  BYTE endcyl;   /* also a 10 bit nmbr, with same high 2 bit trick */
  DWORD relsect; /* first sector relative to start of disk */
  DWORD numsect; /* number of sectors in partition */
 };
 struct DISK_ADD_PACKET {
  BYTE recordsize;
  BYTE reserved;
  WORD count;
  DWORD transferadd;
  DWORD lowbits;
  DWORD highbits;
 };
 struct MBR{
  BYTE codes[446];
  struct PARTITIONINFO partition[4];
  WORD mbrid;
 };
 struct driveinfo{
  DWORD startsect;
  BYTE sysid;
 };
 WORD ExtentionCheck (BYTE drive)
 {
 union REGS regs;
 regs.h.ah = 0x41;
 regs.x.bx = 0x55aa;
 regs.h.dl = drive;
 int86(0x13,®s,®s);
 if(regs.x.bx != 0xaa55)
  return FALSE;
 return TRUE;
 }
 WORD ReadSect(BYTE disk, int nsects,DWORD lsects,void* data)
 {
 union REGS iregs,oregs;
 struct SREGS sregs;
 int count=0;
 struct DISK_ADD_PACKET * p;
 p = (struct DISK_ADD_PACKET *)malloc(sizeof(struct DISK_ADD_PACKET));
 p->recordsize=sizeof(struct DISK_ADD_PACKET);
 p->count=nsects;
 p->transferadd=(DWORD)data;
 p->lowbits=lsects;
 p->highbits=0; /* We dont need to access HD > 2TB */
 iregs.h.ah = 0x42;
 iregs.h.dl = disk;
 iregs.x.si = FP_OFF(p);
 sregs.ds = FP_SEG(p);
 int86x(0x13,&iregs,&oregs,&sregs);
 if(oregs.h.ah==0)
  {
 free(p);
  return TRUE;
  }
 free(p);
 return FALSE;
 }
 WORD WriteSect(BYTE disk, int nsects,DWORD lsects,void* data)
 {
 union REGS iregs,oregs;
 struct SREGS sregs;
 int count=0;
 struct DISK_ADD_PACKET * p;
 p = (struct DISK_ADD_PACKET *)malloc(sizeof(struct DISK_ADD_PACKET));
 p->recordsize=sizeof(struct DISK_ADD_PACKET);
 p->count=nsects;
 p->transferadd=(DWORD)data;
 p->lowbits=lsects;
 p->highbits=0; /* We dont need to access HD > 2TB */
 iregs.x.ax = 0x4302;
 iregs.h.dl = disk;
 iregs.x.si = FP_OFF(p);
 sregs.ds = FP_SEG(p);
 int86x(0x13,&iregs,&oregs,&sregs);
 if(oregs.h.ah==0)
 {
 free(p);
 return TRUE;
  }
 free(p);
 return FALSE;
 }
 DWORD lsect=0;
 void main()
 {
 BYTE disk=0x80;
 WORD nsect=1,index=0,i=0,hi,choice;
 DWORD extsect;
 BYTE hideindex[5],id;
 struct MBR *mbr;
 struct driveinfo dinfo[10];//max 10 partitions
 mbr=(struct MBR *)malloc(sizeof(struct MBR));
 if(ExtentionCheck(disk)==FALSE)
 {printf("extended int 13 is not supported
 ");
 exit(1);
 }

 if(ReadSect(disk, nsect, lsect,(char *)mbr)==TRUE)
 for(i=0;i<4;i++)
   if(mbr->partition[i].systid!=0)
   {printpart(mbr,i);
   dinfo[index].startsect=lsect;
   dinfo[index].sysid=mbr->partition[i].systid;
   index++;
   }
 if(mbr->partition[1].systid==0xf)//0xf for extended partition
  {lsect=mbr->partition[1].relsect;
   extsect=lsect;
 link:
   if(ReadSect(disk, nsect, lsect,(char *)mbr)==TRUE)
    {printpart(mbr,0);
    dinfo[index].startsect=lsect;
    dinfo[index].sysid=mbr->partition[0].systid;
    index++;
    if(index>=10){printf("no of partition exceed max limit");exit(1);}
    if(mbr->partition[1].systid!=0)
 {lsect=extsect+mbr->partition[1].relsect;
  goto link;
 }
    }
  }
 printf("

 Hide partition(1)
 ");
 printf("Revele partition(2)
 ");
 printf("Quit(3)
 Enter your choice(1/2/3):");
 hideindex[0]=getche();
 choice=atoi(hideindex);
 switch(choice)
 {
  case 1:
     printf("
 Which drive do u want to hide:(0-%d):",index-1);
     scanf("%s",hideindex);
     hi=atoi(hideindex);
    if(hi<=index)
   {
    id=dinfo[hi].sysid;
    if(id==1||id==4||id==7||id==0xb||id==0xc||id==0xe)
    { lsect=dinfo[hi].startsect;
     id+=0x10;
     if(ReadSect(disk, nsect, lsect,(char *)mbr)==TRUE)
     {mbr->partition[0].systid=id;
     if(WriteSect(disk,nsect,lsect,(char *)mbr)==TRUE)
     printf("
 HIDDEN SUCCESSFULLY");
     }
    }
    else
    printf("Cant Hide");
   }
     break;
   case 2:
     printf("
 Which drive do u want to Revele:(0-%d):",index-1);
     scanf("%s",hideindex);
     hi=atoi(hideindex);
    if(hi<=index)
   {
    id=dinfo[hi].sysid;
    if(id==0x11||id==0x14||id==0x17||id==0x1b||id==0x1c||id==0x1e)
    { lsect=dinfo[hi].startsect;
      id-=0x10;
     if(ReadSect(disk, nsect, lsect,(char *)mbr)==TRUE)
     {mbr->partition[0].systid=id;printf("%x",mbr->partition[0].systid);
     if(WriteSect(disk,nsect,lsect,(char *)mbr)==TRUE)
     printf("
 REVELED SUCCESSFULLY");
     }
    }
    else
    printf("Cant Revele
 ");
   }
     break;
   case 3:
   exit(1);break;
   default:
   printf("
 invalid choice");exit(1);
   break;
  };
 }
 printpart(struct MBR *mbr,WORD i)
 {
 BYTE bootable[]="YES";
 BYTE id[7];
 static BYTE c=0,index=0;
 if(c==0)//to execute this for once
 {
 clrscr();
 gotoxy(30,1);
 printf("Partition Table");
 gotoxy(2,2);
 printf("INDEX");
 gotoxy(8,2);
 printf("SystemID");
 gotoxy(17,2);
 printf("Bootable");
 gotoxy(26,2);
 printf("StartingLBA");
 gotoxy(38,2);
 printf("SIZEINSECTORS");
 gotoxy(52,2);
 printf("SIZEINGB");
 c++;
 gotoxy(46,20);
 printf("Coded by Tapan Kumar Mishra");
 gotoxy(55,21);
 printf("7th Sem,Electrical Engg.");
 gotoxy(55,22);
 printf("IGIT Sarang,Orissa");
 gotoxy(46,23);
 printf("Email id:titu_igit@rediffmail.com");
 }
 if(mbr->partition[i].bootid!=0x80)
  strcpy(bootable,"NO");
 gotoxy(2,3+index);
 printf("%d",index);
 gotoxy(8,3+index);
 systemid((BYTE)mbr->partition[i].systid,id);
 printf("%s",id);
 gotoxy(17,3+index);
 printf("%s",bootable);
 gotoxy(26,3+index);
 printf("%ld",mbr->partition[i].relsect+lsect);
 gotoxy(38,3+index);
 printf("%ld
 ",mbr->partition[i].numsect);
 gotoxy(52,3+index);
 printf("%5.2fGB",(float)mbr->partition[i].numsect/2097152.0);

 index++;
 return 0;
 }
 systemid(BYTE systid,BYTE *id)
 {
      switch(systid)
      {
 case  00:
  strcpy(id,"empty");
  break;
 case 01:
  strcpy(id,"FAT12");
  break;
 case 04:
  strcpy(id,"FAT16");
  break;
 case 05:
  strcpy(id,"EXTNED");
  break;
 case 0xb:
  strcpy(id,"FAT32");
  break;
 case 0xc:
  strcpy(id,"FAT32");
  break;
 case 0xE:
  strcpy(id,"FAT16");
  break;
 case 0xf:
  strcpy(id,"EXNDED");
  break;
 case 0x82:
  strcpy(id,"SWAP");
  break;
 case 0x83:
  strcpy(id,"EXT2fs");
  break;
 case 0x11:
 case 0x14:
 case 0x15:
 case 0x16:
 case 0x17:
 case 0x1b:
 case 0x1c:
 case 0x1e:
 case 0x1f:
  strcpy(id,"hidden");
  break;

 }
 }
 //End of code