www.pudn.com > schddog.zip > SETPASSD.C

#include 
#include 
#define MemSize *(unsigned far *)0x00400013 
void ReadStr(char *str) 
{ 
 unsigned char Plength=1; 
 unsigned xx,yy,x; 
 union REGS r; 
 xx=wherex();yy=wherey(); 
 x=xx; 
 do{ 
     gotoxy(xx,yy); 
     r.h.ah=0; 
     int86(0x16,&r,&r); 
     if((r.h.ah!=28)&&(r.h.ah!=14)&&(r.h.ah!=1)) 
     { 
      *(str+Plength)=(r.h.al-20)|0x80; 
      gotoxy(xx,yy); 
      putch('*'); 
      xx++;Plength++; 
     } 
     else if(r.h.ah==14) 
          { 
           xx--; 
           if(xx1)Plength--; 
          } 
          else if(r.h.ah==1)Plength=0; 
    }while((r.h.ah!=28)&&(r.h.ah!=1)&&(Plength<15)); 
    *(str+0)=Plength-1; 
} 
int ReadPass(char *buffer) 
{ 
 union REGS ireg; 
 struct SREGS oreg; 
 ireg.x.ax=0x0201; 
 ireg.x.bx=FP_OFF(buffer); 
 ireg.x.cx=0x0006; 
 ireg.x.dx=0x0080; 
 oreg.es=FP_SEG(buffer); 
 int86x(0x50,&ireg,&ireg,&oreg); 
 return ireg.h.ah; 
} 
int WritePass(char *buffer) 
{ 
 union REGS ireg; 
 struct SREGS oreg; 
 ireg.x.ax=0x0301; 
 ireg.x.bx=FP_OFF(buffer); 
 ireg.x.cx=0x0006; 
 ireg.x.dx=0x0080; 
 oreg.es=FP_SEG(buffer); 
 int86x(0x50,&ireg,&ireg,&oreg); 
 return ireg.h.ah; 
} 
int CheckPass(char *src,char *dest) 
{ 
 unsigned char Plength,p2; 
 Plength=*(src+0); 
 p2=*(dest+0); 
 if(Plength!=p2)return -1; 
 while(Plength>0) 
 { 
  if(*(src+Plength)!=*(dest+Plength))return -1; 
  Plength--; 
 } 
 return 1; 
} 
int CopyPass(char *src,char *dest) 
{ 
 char Plength; 
 Plength=*(src+0); 
 while(Plength>=0) 
 { 
  *(dest+Plength)=*(src+Plength); 
  Plength--; 
 } 
 return 0; 
} 
void reboot(void) 
{ 
 void (far *reboot_ptr)(void); 
 unsigned int far *i_ptr; 
 clrscr(); 
 i_ptr=MK_FP(0x0040,0x0072); 
 *i_ptr=0x1234; 
 reboot_ptr=MK_FP(0xF000,0xFFF0); 
 reboot_ptr(); 
} 
void copyright() 
{ 
 printf("\n Yaking (R) Password Changer for Hard Disk Dog version 1.0"); 
 printf("\n Copyright (C) 1997.12, Yaking Software Studio.\n"); 
} 
 
void main() 
{ 
 char buffer[512]; 
 char passwd[16],passwd1[16]; 
 char *source; 
 char key; 
 copyright(); 
 if(MemSize==0x280) 
 { 
  printf("\n\a Yaking-HDDOG Not Installed.\n"); 
  exit(1); 
 } 
 while(ReadPass(buffer)!=0); 
 source=buffer+0x200-32; 
 printf("\n Old Password: "); 
 ReadStr(passwd); 
 if(CheckPass(source,passwd)==1) 
 { 
  printf("\n New Password: "); 
  ReadStr(passwd); 
  printf("\n V e r i f y : "); 
  ReadStr(passwd1); 
  if(CheckPass(passwd,passwd1)==1) 
  { 
   CopyPass(passwd,source); 
   WritePass(buffer); 
   printf("\n Do you want to reboot to enable new password?(Y/N)"); 
   key=getch(); 
   if((key=='Y')||(key=='y'))reboot(); 
   else {printf("\n Password changed ok.");exit(1);} 
  } 
  else {printf("\n\a Password dismatch!");exit(1);} 
 } 
 printf("\n\a Wrong Password!"); 
}