mirror of
https://github.com/vxunderground/MalwareSourceCode
synced 2024-06-26 00:48:29 +00:00
364 lines
13 KiB
NASM
364 lines
13 KiB
NASM
BAC segment para public 'code'
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assume cs:BAC, ds:BAC, es:BAC, ss:NOTHING
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org 100h ; .COM format
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BEGIN:
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jmp CODE_START ; Jump around data declarations
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DECLARE: ; Messages, Storage Areas, Equates
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COPYRIGHT db 'BACopy (C) 1985, Dickinson Associates Inc.'
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db 13,10,'$'
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PATH_FILE_LEN equ 77 ;Length = 1, Path = 63, FileName = 12, 0 = 1
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SOURCE_FILE db PATH_FILE_LEN dup (0)
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TARGET_PATH db PATH_FILE_LEN dup (0)
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SOURCE_END dw 0
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TARGET_END dw 0
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SOURCE_HANDLE dw 0
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TARGET_HANDLE dw 0
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SOURCE_DTA db 44 dup(0)
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TARGET_DTA db 44 dup(0)
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VALID_IN db 'abcdefghijklmnopqrstuvwxyz,;=',9
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VALID_OUT db 'ABCDEFGHIJKLMNOPQRSTUVWXYZ',4 dup(32)
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VALID_NUM equ $ - VALID_OUT + 1
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BLKSIZE dw 0
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LAST_BLOCK db 0
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EVENT_FLAG db 0
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ERR_HEAD db 10,13,'BACopy Error - $'
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NO_PARMS db 'Correct Syntax is:',13,10,10
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db 'BACopy [d:][source_path]source_filename[.ext] [d:][target_path]$'
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FILE_NOT_FOUND db 'File Not Found$'
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SOURCE_ERROR db 'Opening Source File$'
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CREATE_ERROR db 'Creating Target File$'
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TARGET_FULL db '!!',10,10,13,'Target Disk is Full',13,10,10
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db 'Insert New Disk and Press [Enter]',7,'$'
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ERR_TAIL db 10,10,13,' . . . Aborting',10,13,13,'$'
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CONFIRM_MSG_1 db ' . . $'
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CONFIRM_MSG_2 db 'BACopied to . . $'
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END_LINE db 10,13,'$'
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NOTHING_TO_DO db 13,10,'No Files Needed to be BACopied',13,10,'$'
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;
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CODE_START: ; Parse command line into source & target parameters
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mov dx,offset COPYRIGHT ; Display copyright notice
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mov ah,9h
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int 21h
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mov si,80h ; PSP parameter byte count pointer
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mov cl,[si] ; Move byte count to CL
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xor ch,ch ; Zero CH
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jcxz NO_PARMS_PASSED ; If CX is zero, there are no parameters
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mov dx,cx ; Save byte count in dx
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inc si ; Point to parameter area
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mov di,si ; Copy SI to DI for cleanup routine
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cld ; Set direction flag to forward
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CLEAN_PARMS: ; Change valid delimiters to blanks, lower to upper case
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lodsb ; Load each character to AL
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push di ; Save DI on stack
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mov di,offset VALID_IN ; Point to table of valid inputs
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push cx ; Save CX on stack
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mov cx,VALID_NUM ; Set CX to number of inputs to look for
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repne scasb ; See if any are in AL
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jcxz CLEAN_END ; If not, change nothing
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mov bx,VALID_NUM ; Set up BX to point to valid output
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sub bx,cx ; This will leave BX one off
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mov al,VALID_OUT [bx - 1] ; Load the valid output to AL
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CLEAN_END:
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pop cx ; Restore CX
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pop di ; Restore DI
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stosb ; Store modified AL back to PSP
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loop CLEAN_PARMS ; Loop until CX is zero
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;
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mov cx,dx ; Restore number of bytes in PSP to CX
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mov dx,2 ; Set DX to look for up to 2 parameters
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mov bx,offset SOURCE_FILE ; Set BX to address of 1st parameter
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mov al,' ' ; Set up to scan for first non-blank
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mov di,81h ; Set DI to PC-DOS parameter pointer
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FIND_PARMS: ; Start looking for parameters, load to program storage
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repe scasb ; Scan while blanks
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mov si,di ; Set SI to second non-blank byte
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dec si ; Adjust it to first non-blank byte
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inc cx ; Adjust CX to compensate
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jcxz PARMS_LOADED ; If CX is zero, no parameters left
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mov di,bx ; Set DI to parameter hold area
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mov ax,cx ; Store CX to first byte of hold area
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stosb ; DI is adjusted to second byte here
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STORE: lodsb ; Load each byte to AL
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cmp al,' ' ; Is it a blank?
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jz END_STORE ; Yes, end of this parameter
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stosb ; No, store the byte to hold area
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END_STORE:
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loopnz STORE ; Keep looking
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sub [bx],cx ; Store number of bytes in each
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jcxz PARMS_LOADED ; If CX is zero, no more parameters
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dec byte ptr [bx] ; parameter to first byte of hold area
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mov di,si ; Set up to scan for next non-blank
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dec di ; Adjust DI to point to the blank
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inc cx ; Adjust CX to compensate
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dec dx ; Decrement DX counter
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cmp dx,0 ; Is DX zero?
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jz PARMS_LOADED ; Yes, all expected parameters loaded
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add bx,PATH_FILE_LEN ; No, point to next part of hold area
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jmp FIND_PARMS ; Go back and look for more
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PARMS_LOADED: ; All parameters are loaded
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cmp SOURCE_FILE[0],0 ; If there are no bytes in the
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ja FIX_UP ; SOURCE_FILE, no parameters present
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NO_PARMS_PASSED: ; Exit with an error if there
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mov dx,offset NO_PARMS ; are no parameters passed
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jmp ERROR_EXIT
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FIX_UP: ; Fix SOURCE_FILE and TARGET_PATH
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mov si,offset SOURCE_FILE ; For Search calls
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lodsb ; Get Number of bytes
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xor ah,ah ; Zero high byte of AX
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mov di,si ; Move SI to DI for scan
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add di,ax ; Start scan at end of parameter
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dec di ; Adjust DI
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mov cx,ax ; Set CX to number of bytes
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mov al,'\' ; Scan for the last '\'
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std ; Set direction flag to reverse
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repnz scasb ; Scan while not '\'
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jnz NO_SOURCE_DIR ; If Zero Flag not set, '\' not found
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add di,2 ; Add 2 to DI to point to file name
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jmp SOURCE_FIXED ; position
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NO_SOURCE_DIR: ; No source directory was specified
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add di,1 ; Adjust DI
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cmp SOURCE_FILE[2],':' ; Check for specified disk drive
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jne SOURCE_FIXED ; None present, we're done
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mov di,offset SOURCE_FILE[3]; Yes, set DI to point to first byte
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SOURCE_FIXED: ; after ':'
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mov SOURCE_END,di ; Move DI to SOURCE_END pointer
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;
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cld ; Set direction flag to forward
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mov si,offset TARGET_PATH ; Set up to look for '\' present
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lodsb ; Get number of bytes
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cmp al,0 ; If it's zero, no target specified
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je NO_TARGET
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xor ah,ah ; Zero high byte of AX
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add si,ax ; Add it to SI to point to end
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dec si ; Decrement SI to adjust
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lodsb ; Look at last byte
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mov di,si ; Copy SI to DI
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cmp al,'\' ; Is last byte a '\'?
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je TARGET_FIXED ; Yes, everything's fine
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cmp TARGET_PATH[0],2 ; If TARGET_PATH is 2 bytes long and
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jne STORE_SLASH ; is a disk drive specification,
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cmp TARGET_PATH[2],':' ; let it default to the current
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je TARGET_FIXED ; directory.
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STORE_SLASH: ; Place a '\' at the end of
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mov al,'\' ; TARGET_PATH if user did
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stosb ; not
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TARGET_FIXED:
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mov TARGET_END,di ; Move DI to TARGET_END pointer
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jmp BUFFER_SIZE
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NO_TARGET: ; Set up to allow target path default
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mov TARGET_END,offset TARGET_PATH + 1 ; to current path
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BUFFER_SIZE: ; Compute size of file buffer
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mov ax,0fdffh ; Leave plenty of room in segment
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mov dx,offset FILE_BUFFER ; for stack & set DX to end of code
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sub ax,dx ; Subtract
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mov BLKSIZE,ax ; Save result in BLKSIZE
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FIND_FILE: ; Find first source file
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xor ax,ax ; Request to use SOURCE_DTA
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mov ah,1ah ; to house FCB for SOURCE_FILE
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mov dx,offset SOURCE_DTA
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int 21h ; Call PC-DOS
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mov dx,offset SOURCE_FILE + 1 ; DX points to SOURCE_FILE
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mov ah,4eh ; Request function 4EH (find 1st file)
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mov cx,0 ; Set CX to zero for normal files only
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int 21h ; Call PC-DOS
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jnc FOUND_FILE ; If no error, first file found
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mov dx,offset FILE_NOT_FOUND; If no files found, exit
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jmp ERROR_EXIT ; program with error message
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FOUND_FILE:
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mov LAST_BLOCK,0 ; Initalize last block read flag
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mov si,offset SOURCE_DTA+30 ; SI points to source file name in DTA
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mov di,SOURCE_END ; DI points to end of source path
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push si ; Save pointer to source file name
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mov cx,13 ; DTA will have 13 bytes
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rep movsb ; Move name bytes to SOURCE_FILE
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mov di,TARGET_END ; DI points to end of target path
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pop si ; Recover pointer to source file name
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mov cx,13 ; DTA will have 13 bytes
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rep movsb ; Move file name bytes to TARGET_PATH
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FIND_TARGET: ; Find matching target file
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mov ah,1ah ; Request to use TARGET_DTA
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xor al,al ; to house FCB for TARGET_PATH
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mov dx,offset TARGET_DTA
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int 21h ; Call PC-DOS
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mov ah,4eh ; Request find 1st file for target
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mov dx,offset TARGET_PATH+1
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mov cx,0 ; Set CX to zero for normal files only
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int 21h ; Call PC-DOS
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jc OPEN_SOURCE ; If not found, bypass date & time check
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CHECK_TIME_DATE: ; Check time & date stamps in DTAs
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mov si,offset SOURCE_DTA+24 ; Load source file date stamp to AX
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lodsw
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mov dx,ax ; Save in DX
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mov si,offset TARGET_DTA+24 ; Load target file date stamp to AX
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lodsw
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cmp dx,ax ; If Source file newer, jump
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ja OPEN_SOURCE ; to OPEN_SOURCE
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jne DONT_COPY ; If Source file older, don't copy it
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mov si,offset SOURCE_DTA+22 ; Otherwise,
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lodsw ; load source time stamp to AX
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mov dx,ax ; Save in DX
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mov si,offset TARGET_DTA+22 ; Load target time stamp to AX
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lodsw
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cmp dx,ax ; If Source file newer, jump
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ja OPEN_SOURCE ; to OPEN_SOURCE
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jmp DONT_COPY
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DONT_COPY: ; Otherwise,
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call CLOSE_ALL ; Close all files
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jmp NEXT_FILE ; Check for next file
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OPEN_SOURCE:
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mov ah,3dh ; Request Open Source File
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mov dx,offset SOURCE_FILE+1 ; DX points to source file path name
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mov al,0 ; with read permission only
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int 21h ; Call PC-DOS
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mov SOURCE_HANDLE,ax ; Save handle in memory
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jnc CREATE_TARGET ; If no carry, open was good
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mov dx,offset SOURCE_ERROR ; Otherwise, exit with error
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mov SOURCE_HANDLE,0 ; Make sure CLOSE_ALL ignores handle
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jmp ERROR_EXIT
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CREATE_TARGET:
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xor ax,ax
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mov ah,3ch ; Request create & open a file
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mov dx,offset TARGET_PATH+1 ; named the target file
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xor cx,cx ; with normal attribute
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int 21h ; Call PC-DOS
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mov TARGET_HANDLE,ax ; Save target handle
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jnc PROCEED_TO_COPY ; If no carry, create / open is ok
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mov dx,offset CREATE_ERROR ; Otherwise, exit with an error
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mov TARGET_HANDLE,0 ; Make sure CLOSE_ALL ignores target
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jmp ERROR_EXIT
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PROCEED_TO_COPY: ; The heart of the matter
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mov si,offset SOURCE_FILE+1 ; Point to source file
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START1: lodsb ; Load each byte to AL
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cmp al,0 ; If ASCII 0, end of field
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je DOTS
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mov dl,al ; Copy byte to DL for funciton 2H
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mov ah,2h ; Request function 2H
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int 21h ; Call PC-DOS
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jmp START1 ; Get next character
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DOTS: mov ah,9h ; Confirm start of task
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mov dx,offset CONFIRM_MSG_1
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int 21h
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KEEP_COPYING:
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mov ah,3fh ; Request read block of data
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mov cx,BLKSIZE ; BLKSIZE bytes long
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mov bx,SOURCE_HANDLE ; from source file
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mov dx,offset FILE_BUFFER ; into buffer
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int 21h ; Call PC-DOS
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cmp ax,0 ; If AX is 0, no bytes were
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je FINISH ; read, and we're done
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mov cx,ax ; Move AX to CX for write call (below)
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cmp cx,BLKSIZE ; Check number of bytes read against
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je MORE_TO_COME ; request. If equal, we got them all,
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mov LAST_BLOCK,1 ; otherwise, it's the last block of file
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MORE_TO_COME: ;
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push cx ; Save requested write count on stack
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mov ah,40h ; Request write block of data
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mov bx,TARGET_HANDLE ; to target file
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mov dx,offset FILE_BUFFER ; from file buffer
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int 21h ; Call PC-DOS
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pop cx ; Recover requested write count
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cmp ax,cx ; If CX equals AX,
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je WRITE_OK ; write was successful,
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DISK_FULL:
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call CLOSE_ALL ; Otherwise disk is full -- close files
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mov ah,41h ; Request erase file
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mov dx,offset TARGET_PATH+1 ; for incomplete target.
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int 21h ; Call PC-DOS
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mov dx,offset TARGET_FULL
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mov ah,9h
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int 21h
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READ_KEYBOARD: ; Prompt requested [Enter] key
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mov ah,8h ; Make sure [Ctrl]-[Break] is detected
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int 21h ; Call PC-DOS for key
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cmp al,13 ; Check for [Enter]
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jne READ_KEYBOARD ; (no extended codes are 13)
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mov cx,2
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END_FULL:
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mov dx,offset END_LINE ; Send a new line to screen
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mov ah,9h
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int 21h
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loop END_FULL
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jmp FOUND_FILE ; Re-start from FOUND_FILE:
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WRITE_OK:
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cmp LAST_BLOCK,1 ; If this is the last block,
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je FINISH ; we're done
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jmp KEEP_COPYING ; Otherwise, keep going.
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FINISH: ; Force target time & date stamps
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mov ah,57h ; to equal source, close files
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mov al,0 ; Request get time and date stamos
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mov bx,SOURCE_HANDLE ; for source file
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int 21h ; DX & CX contain data
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mov ah,57h ; Request set date and time
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mov al,1 ; to force target file to
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mov bx,TARGET_HANDLE ; source stamp
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int 21h ; Call PC-DOS
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call CLOSE_ALL ; Go close all files
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mov dx,offset CONFIRM_MSG_2 ; Confirm completion of task
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mov ah,9h ; Request function 9H
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int 21h ; Call PC-DOS
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mov si,offset TARGET_PATH+1 ; Point to source file
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START2: lodsb ; Load each byte to AL
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cmp al,0 ; If ASCII 0, end of field
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je CR_LF
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mov dl,al ; Copy byte to DL for funciton 2H
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mov ah,2h ; Request function 2H
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int 21h ; Call PC-DOS
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jmp START2 ; Get next character
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CR_LF: mov dx,offset END_LINE ; Terminate display line
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mov ah,9h ; Request function 9H
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int 21h
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mov EVENT_FLAG,1 ; Set flag to indicate file was copied
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NEXT_FILE: ; Go Look for next file
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xor ax,ax
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mov ah,1ah ; Request to use SOURCE_DTA
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mov dx,offset SOURCE_DTA ; to house FCB for SOURCE_FILE
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int 21h ; Call PC-DOS
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mov ah,4fh ; Request find next source file
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mov cx,0 ; Normal files only
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int 21h ; Call PC-DOS
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jnc FOUND_ANOTHER ; No error, another file was found
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jmp END_OK ; Error, we're done finding files
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FOUND_ANOTHER:
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jmp FOUND_FILE ; Go process next file
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END_OK: cmp EVENT_FLAG,1 ; Did anything happen?
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je EXIT ; Yes, just exit
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mov dx,offset NOTHING_TO_DO ; No, tell user that nothing happened
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mov ah,9h
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int 21h
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EXIT: int 20h ; Exit to PC-DOS
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ERROR_EXIT: ; Print Error Message and Exit
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push dx ; Save error message pointer on stack
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mov ah,9 ; Display error header
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mov dx,offset ERR_HEAD
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int 21h
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mov ah,9 ; Display error message
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pop dx
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int 21h
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mov ah,9 ; Display error tail
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mov dx,offset ERR_TAIL
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call CLOSE_ALL
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int 21h
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int 20h ; Exit to PC-DOS
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CLOSE_ALL proc
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cmp SOURCE_HANDLE,0 ; Check for valid SOURCE_HANDLE
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je CLOSE_TARGET ; None, then go close target
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mov ah,3eh ; Request close file
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mov bx,SOURCE_HANDLE ; for source handle
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int 21h ; Call PC-DOS
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mov SOURCE_HANDLE,0 ; Refresh handle
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CLOSE_TARGET:
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cmp TARGET_HANDLE,0 ; Check for valid TARGET_HANDLE
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je CLOSE_RETURN ; None, then return
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mov bx,TARGET_HANDLE ; Request close file
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mov ah,3eh ; for target handle
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int 21h ; Call PC-DOS
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mov TARGET_HANDLE,0 ; Refresh handle
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CLOSE_RETURN:
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ret
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CLOSE_ALL endp
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FILE_BUFFER label word
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BAC ends
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end BEGIN
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