HPAVC/HPAVC CD-ROM.iso/BNU202.ZIP/FUTIL.ASM

Assembly Source File | 1989-07-31 | 17KB | 647 lines

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;    FOSSIL/Modem Testing Utility
;;    Copyright (c)  June, 1992
;;    Unique Computing Pty Limited & David Nugent
;;    FidoNet Node 3:632/348.0
;;    Alternet Node 7:833/387.0
;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;
; This utility is useful for testing various aspects of FOSSIL-aware software,
; by simulating a modem and enabling the user to set or reset certain status
; information returned by the FOSSIL to an application.
;
; It was created primarily to simulate a remote modem connect for testing
; purposes using a direct wire but allowing direct control from local keyboard.
;
; FUTIL installs as a TSR wedge between the FOSSIL and an application.  It
; requires that a revision 5 FOSSIL driver be installed prior to it, and it
; will capture INT 14H (it looks like a FOSSIL to the application) and
; intercept certain FOSSIL calls in order to carry out its simulation.
;
; This utility is particularly useful because it is release WITH SOURCE.
; It can therefore be modified and re-assembled to carry out any simulation
; required, but this will take a little knowledge in how FOSSIL operates
; and some expertise in PC operations in general.
;
; Please read the accompanying documentation for license details and caveats.
;

; V1.00 June 1992        Original release
; V1.10 July 1992        Small bug fix: purging FOSSIL
;                receive buffer now clears pending input
;                status bit (previously this would look
;                effectively hang a machine with some s/w).

;
; NOTE: MASM 5.10 or TASM 1.0 is required to assembly this program!
;       Earlier versions of MASM will NOT work.
;
; Provides TASM->MASM compatibility

ifdef ??version
    masm51
    quirks
endif

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; Definitions/readability section
;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

CDSIG        equ 0F23DH        ; FUTIL's signature
MAGIC        equ 01954H        ; FOSSIL's magic number
DOS        equ 021H        ; DOS interrupt
TSR        equ 027H        ; .COM TSR call
; Keyboard shift key codes
CTRL        equ 004H        ; Ctrl key is down
SHIFTS        equ 003H        ; Any shift pressed
LSHIFT        equ 002H        ; Left shift
RSHIFT        equ 001H        ; Right shift
ALT        equ 008h        ; Alt key pressed
NUMLOCK        equ 020H        ; Numlock state
; BIOS ports, data area definitions
SH_STATE    equ 0417H        ; Shift state byte
KBD_PORT    equ 060H        ; Keyboard data port
KBD_CTRL    equ 061h        ; Keyboard control port
LSC        equ (LSHIFT or CTRL)    ; Shorthand for Ctrl-LShift
KUSED        equ 0FH            ; Bits used in shift mask
; FOSSIL status bits
PS_CARRIER    equ    0080H        ; Carrier signal from MSREG
PS_RXCHARS    equ    0100H        ; Characters in input buffer


;;;;;;;;;;;;;;;;
;;
;; Start program
;;
;;;;;;;;;;;;;;;;

_code segment para public 'code'
    assume CS:_code
    org 100h            ; .COM start

; Jump to install (which is unloaded on TSR

start:
    jmp install

;
; Int 14H entry point
;
    even
Int_14:
    jmp SHORT parse

;
; FOSSIL data section
;

oldvec    dd 0                ; Old INT 14H vector
    dw MAGIC            ; Make it look like a FOSSIL
    dw 001bH            ; Revision 5 type
    dw CDSIG
kbdvec    dd 0                ; Old INT 09H vector
;
port    dw 0                ; Port number
;
; Status information
;
; WARNING: DO NOT CHANGE THE ORDER AND CONTENTS OF THIS SECTION
;          WITHOUT CONSIDERING THE 'HOTKEYS' SECTION BELOW.  THESE
;          VARIABLES CORRESPOND DIRECTLY TO THE HOKEY STRUCTURE!!
;
even
cstate    dw 0                ; Carrier detect mask (default no extra)
cdmask    dw -1                ; Status mask out bits (default leave alone)
tdata    dw 0                ; Ignore transmit data flag
rdata    dw 0                ; Receive data flag
isdata    dw 0                ; Is data to send flag
strp    dw 0                ; Pointer to current string

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;    INT 14H handler
;;    Only a subset of commands are intecepted
;;    Tests code in AH, otherwise passes control
;;    to the installed FOSSIL driver
;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

parse    PROC NEAR

    sti
    cld
    cmp DL,BYTE PTR CS:[port]        ; Select only for current port
    je @F
    jmp DWORD PTR CS:[oldvec]
@@:
    cmp AH,01H            ; Transmit data
    je @istxch
    cmp AH,02H            ; Receive data
    je @isrxch
    cmp AH,03H            ; Port status
    jne @F
    jmp @isstat
@@:
    cmp AH,0AH            ; Receive buffer purge
    je @isrp
    cmp AH,0BH            ; Transmit no wait
    je @istxnw
    cmp AH,0CH            ; Read, no wait
    je @ispeek
    cmp AH,18H            ; Receive block
    jne @F
    jmp @isrxb
@@:
    cmp AH,19H            ; Transmit block
    jne @norm
    jmp @istxb


; ---------------------
; Read, non-destructive
; ---------------------

@ispeek:
    cmp CS:[isdata],0        ; Is there data to be returned?
    je @norm
    push BX
    mov BX,CS:[strp]
    mov AL,CS:[BX]            ; Get next character
    pop BX
    xor AH,AH
    jmp @bye

; ---------------------
; Transmit no wait call
; ---------------------

@istxnw:
    cmp CS:[tdata],0        ; Eat character
    je @norm
    mov AX,1            ; 1 = successfully sent
    jmp @bye

; -----------------------------------------
; Purge receive buffers (and pending input)
; -----------------------------------------

@isrp:
    mov CS:[isdata],0
    mov CS:[strp],0
    and CS:[cstate],not PS_RXCHARS    ; Reset "chrs in rx buf" status bit
    jmp SHORT @norm

; ------------------
; Transmit character
; ------------------

@istxch:
    cmp CS:[tdata],0        ; Eat character
    jne @F
    jmp @isstat
@@:
    mov AL,03H            ; Force a status call
    jmp @isstat

@norm:
    jmp DWORD PTR CS:[oldvec]    ; Jump straight to old vector

; -----------------
; Receive character
; -----------------

@isrxch:
    cmp CS:[isdata],0        ; Is there data to be returned?
    je @rch
@isrxch1:
    push BX
    mov BX,CS:[strp]
    mov AX,CS:[BX]            ; Get next character
    pop BX
    inc CS:[strp]            ; Move pointer to next character
    or AH,AH            ; Test for end of string
    jne @F
    and CS:[cstate],not PS_RXCHARS    ; Reset "chrs in rx buf" status bit
    mov CS:[isdata],0
@@:
    xor AH,AH
    jmp SHORT @bye

@rch:
    cmp CS:[rdata],0        ; Give control to FOSSIL?
    je @norm
    sti
    push AX
    mov AH,3            ; Else get status
    int 14H
    test AX,PS_RXCHARS        ; Are there characters in buffer?
    pop AX
    je @isrxch
    cmp CS:[isdata],0        ; Is there data to be returned?
    jne @isrxch1
    jmp SHORT @norm

; -------------------
; Transmit block data
; -------------------

@istxb:
    cmp CS:[tdata],0        ; Eat character
    je @norm
    mov AX,CX            ; Return number of characters 'sent'
    jmp SHORT @bye

; ------------------
; Receive block data
; ------------------

@isrxb:
    cmp CS:[isdata],0        ; Is there data to be returned?
    je @norm
    push DI                ; Hmm, better get to work ...
    push CX
    push BX

    cld                ; Required for string opcodes
    mov BX,CS:[strp]        ; Get pointer to string
    jcxz @up            ; Opps, zero chrs requested
@@:
    mov AX,CS:[BX]            ; Get next character
    inc BX
    stosb                ; Store it in user buffer
    or AH,AH            ; Test for end of string
    je @F
    loop @B                ; Until user buffer full
    jmp SHORT @up
@@:                    ; No more available at this point
    and CS:[cstate],not PS_RXCHARS    ; Reset "rx chrs avail" status bit
    mov CS:[isdata],0
    xor BX,BX
@up:
    mov CS:[strp],BX        ; Update string pointer
    mov AX,CX            ; Save remaining number of characters

    pop BX                ; Restore all registers
    pop CX
    pop DI
    sub AX,CX            ; Calculate/return # of bytes received
    neg AX
    jmp SHORT @bye

; -------------------
; Status call handler
; -------------------

@isstat:
    pushf                ; Simulate the old INT 14H
    call DWORD PTR CS:[oldvec]
    or AX,CS:[cstate]        ; OR  in set mask
    and AX,CS:[cdmask]        ; AND out reset mask
@bye:
    iret                ; Return to user

parse    ENDP


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; Configuration section
;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;
; This section contains information which can be modified to suit.
;

;
; Modem control strings
; Various strings returned by a typical modem, available by 'hotkey'
;

; STATUS
nocarrier    db    'NO CARRIER',13,10,0
ok           db 'OK',13,10,0
error        db 'ERROR',13,10,0
busy         db 'BUSY',13,10,0
ring         db 'RING',13,10,0
rring        db 'RRING',13,10,0
voice        db 'VOICE',13,10,0
; CONNECTS
connect      db 'CONNECT',13,10,0
connect300   db 'CONNECT 300',13,10,0
connect1200  db 'CONNECT 1200',13,10,0
connect2400  db 'CONNECT 2400',13,10,0
connect24rel db 'CONNECT 2400/REL',13,10,0
connect9600  db 'CONNECT 9600',13,10,0
connectfast  db 'CONNECT FAST',13,10,0


;
; This next section is a series of structures which allows a 'hotkey'
; combination to be tied to a given action.  The structures contain the
; contents of the INT 14H variables used in the above intercept routines
; and pressing the hotkey combination simply copies in values for these
; variables setting of a reaction by the next intercepted INT 14H call.
;

notkey STRUC
 scanc  db ?        ; Keyboard scan code (returned by KB ROM)
 kshft  db ?        ; Keyboard shift state (BIOS)
 cmask    dw ?        ; Status OR mask (force these bits on)
 cbits  dw ?        ; Status AND mask (force these bits off)
 itx    dw ?        ; Ignore transmited data flag (don't give to FOSSIL)
 irx    dw ?        ; Don't call FOSSIL to receive data flag
 srx    dw ?        ; Is there data to 'receive' flag
 dofs    dw ?        ; Offset of string to 'receive'
notkey ENDS

SZ_ka    equ <size notkey>        ; Size of one hotkey structure

KEYS equ 20                ; Defines how many structures to scan

;
; Hot keys table
;
even
KeyCodes label word
notkey <29H, LSC, 0000H, not 0000H, 00H, 00H, 00H, 0           >  ; cs` Turns all processing off
notkey <0bH, LSC, 0000H, not 0080H, 00H, 00H, 00H, 0           >  ; cs0 Force no carrier
notkey <18H, LSC, 0100H, not 0080H, 00H, 01H, 01H, ok          >  ; csO 'OK'
notkey <12H, LSC, 0100H, not 0080H, 00H, 01H, 01H, error       >  ; csE 'ERROR'
notkey <31H, LSC, 0100H, not 0080H, 00H, 01H, 01H, nocarrier   >  ; csN 'NO CARRIER'
notkey <30H, LSC, 0100H, not 0080H, 00H, 01H, 01H, busy        >  ; csB 'BUSY'
notkey <21H, LSC, 0180H, not 0000H, 00H, 01H, 01H, connectfast >  ; csF 'CONNECT FAST'
notkey <0aH, LSC, 0180H, not 0000H, 00H, 01H, 01H, connect9600 >  ; cs9 'CONNECT 9600'
notkey <04H, LSC, 0180H, not 0000H, 00H, 01H, 01H, connect24rel>  ; cs3 'CONNECT 2400/REL'
notkey <03H, LSC, 0180H, not 0000H, 00H, 01H, 01H, connect2400 >  ; cs2 'CONNECT 2400'
notkey <02H, LSC, 0180H, not 0000H, 00H, 01H, 01H, connect1200 >  ; cs1 'CONNECT 1200'
notkey <13H, LSC, 0100H, not 0080H, 00H, 01H, 01H, ring        >  ; csR 'RING'
notkey <2fH, LSC, 0100H, not 0080H, 00H, 01H, 01H, voice       >  ; csV 'VOICE'
notkey <17H, LSC, 0100H, not 0080H, 00H, 01H, 01H, rring       >  ; csI 'RRING'
notkey <00H, 00H, 0000H, not 0000H, 00H, 00H, 00H, 0           >
notkey <00H, 00H, 0000H, not 0000H, 00H, 00H, 00H, 0           >
notkey <00H, 00H, 0000H, not 0000H, 00H, 00H, 00H, 0           >
notkey <00H, 00H, 0000H, not 0000H, 00H, 00H, 00H, 0           >
notkey <00H, 00H, 0000H, not 0000H, 00H, 00H, 00H, 0           >
notkey <00H, 00H, 0000H, not 0000H, 00H, 00H, 00H, 0           >


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;    Keyboard (hardware) interrupt handler
;;
;;    This routine is triggered on make or break (press or release)
;;    of ANY key on the keyboard.  The KB port is then inspected to
;;    see which key was pressed, and the current shift status read.
;;    The above hotkeys table is then scanned for a match; if found,
;;    the rest of the structure is copied into the variable space,
;;    otherwise the call passes to the previous INT 9H handler.
;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;


Int_9 PROC FAR

    assume DS:nothing,ES:nothing    ; Could (and will) be anywhere

    push AX                ; Must preserve EVERY register here
    push CX
    push DI
    push ES
    xor AX,AX
    mov ES,AX

    in AL,KBD_PORT            ; Scan code of key pressed
    mov AH,ES:[SH_STATE]        ; Current shift state bits
    and AH,KUSED            ; Mask out unused bits
    mov DI,offset KeyCodes        ; Scan key codes table
    mov CX,KEYS
@@:
    cmp AX,CS:[DI]
    je @F
    add DI,SZ_ka
    loop @B
                    ; Key was not found
    pop ES                ; Restore saved registers
    pop DI
    pop CX
    pop AX
    jmp CS:[kbdvec]            ; Pass though to original vector

;
; Key combo found; take action
;

@@:
    in AL,KBD_CTRL            ; Save value of kbd control lines
    mov AH,AL
    or AL,80H            ; Set kbd enable bit
    out KBD_CTRL,AL
    mov AL,AH
    out KBD_CTRL,AL
    mov AL,20H            ; Signal end of HW interrupt to 8259A
    out 20H,AL
    push BX
    xor BX,BX
    mov CX,SZ_ka/2
    jmp SHORT @F
@Clp:
    mov AX,CS:[DI+BX]        ; Copy variables to intercept data area
    mov CS:[BX+offset cstate-2],AX
@@:
    inc BX
    inc BX
    loop @Clp

    pop BX                ; Restore registers
    pop ES
    pop DI
    pop CX
    pop AX
    iret

Int_9 ENDP


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;    End resident section
;;
;;    The rest of this code is discarded on installation as a TSR, and
;;    does not consume additional memory
;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

; Installation messages

msg_nofos    db 7,'No FOSSIL driver installed',13,10,'$'
msg_instald  db 7,'FUTIL is already installed',13,10,'$'
msg_instnot  db 7,'FUTIL is not installed',13,10,'$'
msg_instok   db 'FUTIL is now active',13,10,'$'
msg_inval    db 7,'Invalid command line option',13,10,'$'
msg_unloaded db 'FUTIL successfully unloaded',13,10,'$'
msg_start    db 'FUTIL v1.10  FOSSIL Communications Companion Utility',13,10
             db 'Copyright (C) 1992  David Nugent & Unique Computing Pty Ltd',13,10
             db '$'

; ----------------------
; Installation procedure
; ----------------------

install PROC NEAR
    assume ds:_code                ; DS = CS by default
    mov DX,offset msg_start            ; Output our logo
    mov AH,9
    int DOS
    cld                    ; Required for string opcodes
    mov SI,81H                ; Start of command line
@Top:
    lodsb
    cmp AL,13                ; Test for end of cmdline
    je @Load
    cmp AL,0
    je @Load
    cmp AL,32                ; Skip spaces,
    je @Top
    cmp AL,9                ; and tabs
    je @Top
    cmp AL,'/'                ; Looking for a valid switch
    je @F                    ; character (- or / will do)
    cmp AL,'-'
    je @F
@nogood:
    mov AL,3                ; Something else is invalid
    mov DX,offset msg_inval
    jmp ExitMsg
;
; Read switch value
;
@@:
    lodsb
    cmp AL,'a'                ; Convert to uppercase
    jb @F
    cmp AL,'z'
    ja @F
    sub AL,'a'-'A'
@@:
    cmp AL,'U'                ; /U = Uninstall
    je @Unload
    cmp AL,'P'                ; /P = Port number
    jne @nogood
    lodsb
    cmp AL,'0'                ; Convert # to binary
    jb @nogood
    cmp AL,'9'
    ja @nogood
    sub AL,'0'
    xor AH,AH
    mov port,AX                ; Save in our local variable
    jmp SHORT @Top

;
; Unload from memory
;

@Unload:
    call ChkLoad                ; See if FUTIL is loaded
    cmp ES:[BX+10],CDSIG            ; Is this program installed?
    mov DX,offset msg_instnot
    mov AL,2
    jne ExitMsg
    push DS                    ; Preserve DS for later
    push ES
    push ES
    pop DS
    mov DX,word ptr [kbdvec]
    mov DS,word ptr [kbdvec+2]
    mov AX,2509H                ; Release keyboard
    int DOS
    pop DS
    mov DX,word ptr [oldvec]
    mov DS,word ptr [oldvec+2]
    mov AX,2514H                ; Release INT 14H
    int DOS
    pop DS
    mov AH,49H                ; Deallocate memory (at ES)
    int DOS
    mov DX,offset msg_unloaded
    xor AL,AL
    jmp SHORT ExitMsg

;
; Load into memory
;

@Load:
    call ChkLoad                ; Check to see if we're loaded
    cmp ES:[BX+10],CDSIG            ; Is this program installed?
    mov DX,offset msg_instald
    mov AL,2
    je ExitMsg
    mov DX,offset Int_14            ; Install vector for INT 14H
    mov AX,2514H
    int DOS
    mov AX,3509H                ; Get keyboard vector
    int DOS
    mov word ptr [kbdvec],BX
    mov word ptr [kbdvec+2],ES
    mov DX,offset Int_9
    mov AX,2509H                ; Intercept keyboard
    int DOS
    mov AX,CS
    mov ES,AX
    mov ES,ES:[02cH]            ; Free our environment
    mov AH,049H
    int DOS
    mov DX,offset msg_instok
    mov AH,09H                ; Print message
    int DOS
    mov DX,offset msg_nofos            ; Stay resident
    int TSR

install ENDP

;
; Exit (abort) with a message
;

ExitMsg    PROC NEAR

    push AX                    ; Save exit code
    mov AH,09H                ; Print message
    int DOS
    pop AX
    mov AH,4cH                ; And exit
    int DOS

ExitMsg ENDP

;
; Check to see if already loaded
;

ChkLoad PROC NEAR
    mov AX,3514H                ; Get int 14H vector
    int DOS
    mov word ptr [oldvec],BX        ; And save it
    mov word ptr [oldvec+2],ES
    cmp ES:[BX+6],MAGIC            ; Is a FOSSIL there?
    mov DX,offset msg_nofos
    mov AL,1
    je @F
    pop BX
    mov BX,offset ExitMsg
    push BX
@@:
    ret
ChkLoad ENDP

_code ends

end start