hdkpr.asm

硬盘卫士

code segment
     assume cs:code,ds:code,es:code
     org 100h
begin:jmp start
cyl dw 0
rint13 dw 0,0
myint13:
     push ax
     push cx
     cmp dl,80h
     jnz int13
     cmp ah,03
     jz IsWrite
     cmp ah,05
     jz IsWrite
     cmp ah,0bh
     jz IsWrite
int13:
     pop cx
     pop ax
     jmp dword ptr cs:rint13
IsWrite:
     mov al,cl
     mov cl,6
     shr al,cl
     mov cl,ch
     mov ch,al
     cmp cx,cs:cyl
     jnb int13
     pop cx
     pop ax
     xor ax,ax
     iret
SetupROD:
     mov ax,201h
     mov bx,offset buffer
     mov cx,1
     mov dx,80h
     int 13h
     mov cl,6
     mov ch,[bx+01c4h]
     shr ch,cl
     mov cl,[bx+01c5h]
     mov cyl,cx
     mov ax,3513h
     int 21h
     mov rint13,bx
     mov bx,es
     mov rint13+2,bx
     mov dx,offset myint13
     mov ax,2513h
     int 21h
     mov dx,offset SetupROD
     int 27h
message db 'HD LOCK already Installed!',07,0dh,0ah,'$'
buffer db 256 dup(0)
prompt1 db 0ah,0dh,'Enter new'
password db 'Password:$'
change db 0ah,0dh,'Change password?(Y/N)$'
secret db 'cheguanghong',0
pwbuff db 13 dup(0)
filename db 'c:\dos\rohd.com',0
start:
     push si
     push di
     mov ax,3513h
     int 21h
     push cs
     pop es
     mov dx,offset myint13
     cmp bx,dx
     jnz Cont
     mov dx,offset message
     mov ah,9
     int 21h
     jmp exit
Cont:mov dx,offset password
     mov ah,9
     int 21h
     mov bx,0
loop1:
     mov ah,07
     int 21h
     cmp al,0dh
     jz EndEnter
     cmp bx,11
     ja loop1
     mov pwbuff[bx],al
     inc bx
     jmp loop1
EndEnter:
     mov cx,12
     mov si,offset secret
     mov di,offset pwbuff
     repz cmpsb
     jcxz ok1
     jmp SetupROD
ok1: mov dx,offset change
     mov ah,09
     int 21h
     mov ah,01
     int 21h
     cmp al,'Y'
     jz ToChange
     cmp ah,'y'
     jz ToChange
     jmp exit
ToChange:
     mov dx,offset prompt1
     mov ah,9
     int 21h
     mov bx,0
loop2:
     mov ah,07
     int 21h
     cmp al,0dh
     jz loop4
     mov pwbuff[bx],al
     inc bx
     cmp bx,12
     jb loop2
loop4:
     mov al,0
     mov pwbuff[bx],al
     inc bx
     cmp bx,12
     jb loop4
     mov dx,offset filename
     mov ax,3d02h
     int 21h
     mov bx,ax
     mov cx,0
     mov dx,offset secret-100h
     mov ax,4200h
     int 21h
     mov ah,40h
     mov cx,12
     mov dx,offset pwbuff
     int 21h
     mov ah,3eh
     int 21h
exit:pop di
     pop si
     int 20h
code ends
     end begin