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1991
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04
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net_misc.asm
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Assembly Source File
|
1991-05-17
|
7KB
|
357 lines
title NetBIOS Miscellaneous
include asm.inc
include netbios.inc
public clear_ncb
public netbios_add_name
public netbios_call
public netbios_cancel
public netbios_check
public netbios_delete_name
public netbios_hang_up
public netbios_receive_wait
public netbios_send_broadcast
public netbios_send_datagram
public netbios_send_wait
public put_netbios_name
.data?
temp_ncb ncb <> ; netbios control block for temporary use
.code
extn putchar,strncpy,save_most
;; clear ncb
;
; entry DS:SI ncb ptr
;
clear_ncb proc
pushm ax,cx,di,es
mov ax,ds
mov es,ax
mov di,si
xor ax,ax
mov cx,size ncb
rep stosb
popm es,di,cx,ax
ret
clear_ncb endp
;; netbios add name
;
; entry DS:SI asciiz name (less than 16 characters long)
; exit Cf if error
; AL name number (or return code if error)
;
netbios_add_name proc
call save_most
call zero_temp_ncb ; copy name to control block
call write_temp_ncb
lea di,Ncb_Name[di]
mov cx,size Ncb_Name+1 ; (+1 is for \0, OK to overflow \0
call strncpy ; into next field)
call read_temp_ncb
mov Ncb_Command[si],NB_ADD_NAME_WAIT
call netbios_call
jc nan1 ; if error
mov al,Ncb_Num[si]
nan1: ret
netbios_add_name endp
;; netbios call
;
; entry DS:SI netbios control block
; exit AX return code (0xFF if function pending)
; Cf if error
;
netbios_call proc
push es
mov ax,ds ; call NetBIOS
mov es,ax ; ES:BX points to control block
xchg bx,si
int 5Ch
xchg bx,si
mov al,Ncb_Cmd_Cplt[si] ; get return code
and ax,0FFh ; (AH=0)
jz ncb1 ; if successful completion (Cf==0)
cmp al,0FFh ; set Cf if error (AL!=0xFF)
ncb1: pop es
ret
netbios_call endp
;; netbios cancel
;
; entry DS:SI netbios command block
; exit AX final return code
; Cf if error
;
netbios_cancel proc
pushm si,ds
pushm si,ds ; (push again, pop into NCB below)
call read_temp_ncb ; clear control block
call clear_ncb
pop Ncb_BufferSeg[si] ; set control block fields
pop Ncb_BufferOff[si]
mov Ncb_Command[si],NB_CANCEL
call netbios_call
popm ds,si
ret
netbios_cancel endp
;; netbios check
;
; exit Cf if no netbios driver
; uses AX,SI
;
netbios_check proc
push ds ; check if vector 5C is zero
mov ax,0
mov ds,ax
mov si,4*5Ch
lds si,[si] ; (this will fault in protect mode)
mov ax,ds
or ax,si
jz nbc1 ; if no NetBIOS driver (Cf==0)
call read_temp_ncb
call clear_ncb
mov Ncb_Command[si],NB_INVALID_COMMAND
call netbios_call
nbc1: cmc ; flip error flag
pop ds
ret
netbios_check endp
;; netbios delete name
;
; entry DS:SI asciiz name (less than 16 characters long)
; exit Cf if error
; AL return code
;
netbios_delete_name proc
call save_most
call zero_temp_ncb ; copy name to control block
call write_temp_ncb
lea di,Ncb_Name[di]
mov cx,size Ncb_Name+1 ; (+1 is for \0, OK to overflow \0
call strncpy ; into next field)
call read_temp_ncb
mov Ncb_Command[si],NB_DELETE_NAME_WAIT
call netbios_call
ret
netbios_delete_name endp
;; netbios hang up
;
; entry AL session number
; exit AL return code
; Cf if error
;
netbios_hang_up proc
pushm si,ds
call read_temp_ncb
call zero_temp_ncb
mov Ncb_Lsn[si],al
mov Ncb_Command[si],NB_HANG_UP_WAIT
call netbios_call
popm ds,si
ret
netbios_hang_up endp
;; netbios receive wait
;
; entry AL local session number
; CX buffer length
; ES:DI buffer pointer
; exit AL return code
; CX bytes received (0 if session closed or error)
; Cf if error (session closed is not an error)
;
netbios_receive_wait proc
pushm si,ds
call read_temp_ncb
call zero_temp_ncb
mov Ncb_Lsn[si],al
mov Ncb_Length[si],cx
mov Ncb_BufferOff[si],di
mov Ncb_BufferSeg[si],es
mov Ncb_Command[si],NB_RECEIVE_WAIT
call netbios_call
jnc nrw1 ; if receive OK
mov cx,0 ; else check return code
cmp al,0Ah
je nrw2 ; if session closed, then no error
stc ; else return error
jmp nrw2
nrw1: mov cx,Ncb_Length[si]
nrw2: popm ds,si
ret
netbios_receive_wait endp
;; netbios send broadcast
;
; entry AL add name number
; CX buffer length
; ES:DI buffer
; exit AL return code
; Cf if error
; note waits until datagram sent over network
;
netbios_send_broadcast proc
pushm si,ds
call read_temp_ncb
call clear_ncb
mov Ncb_Num[si],al
mov Ncb_Length[si],cx
mov Ncb_BufferOff[si],di
mov Ncb_BufferSeg[si],es
mov Ncb_Command[si],NB_SEND_BROADCAST_WAIT
call netbios_call
popm ds,si
ret
netbios_send_broadcast endp
;; netbios send datagram
;
; entry AL add name number
; CX buffer length
; ES:DI buffer
; DS:SI asciiz call name (destination)
; exit AL return code
; Cf if error
; note waits until datagram sent over network
;
netbios_send_datagram proc
call save_most ; initialize datagram control block
pushm ds,si
call zero_temp_ncb
call read_temp_ncb
mov Ncb_Num[si],al ; set "add name" number,
mov Ncb_Length[si],cx ; buffer length and pointer
mov Ncb_BufferOff[si],di
mov Ncb_BufferSeg[si],es
popm si,ds
call write_temp_ncb ; copy destination name into block
lea di,Ncb_CallName[di]
mov cx,size Ncb_CallName+1
call strncpy
call read_temp_ncb ; send datagram and wait
mov Ncb_Command[si],NB_SEND_DATAGRAM_WAIT
call netbios_call
ret
netbios_send_datagram endp
;; netbios send wait
;
; entry AL session number
; CX length
; ES:DI buffer pointer
; exit AL return code
; Cf if error
;
netbios_send_wait proc
pushm si,ds
call read_temp_ncb
call zero_temp_ncb
mov Ncb_Lsn[si],al
mov Ncb_Length[si],cx
mov Ncb_BufferOff[si],di
mov Ncb_BufferSeg[si],es
mov Ncb_Command[si],NB_SEND_WAIT
call netbios_call
popm ds,si
ret
netbios_send_wait endp
;; put netbios name
;
; entry DS:SI name field of control block
; uses AX,SI
;
put_netbios_name proc
push cx
mov cx,size Ncb_CallName
pnn1: lodsb
cmp al,' '
jbe pnn2
cmp al,'~'
jbe pnn3
pnn2: mov al,' '
pnn3: call putchar
loop pnn1
pop cx
ret
put_netbios_name endp
;; read temp ncb
;
; exit DS:SI temporary netbios control block
;
read_temp_ncb proc
mov si,@data
mov ds,si
lea si,temp_ncb
ret
read_temp_ncb endp
;; write temp ncb
;
; exit ES:DI temporary netbios control block
;
write_temp_ncb proc
mov di,@data
mov es,di
lea di,temp_ncb
ret
write_temp_ncb endp
;; zero temp ncb
;
zero_temp_ncb proc
pushm ax,si,ds
call read_temp_ncb
call clear_ncb
popm ds,si,ax
ret
zero_temp_ncb endp
end