Category : Network Files
Archive   : TCP_SRC.ZIP
Filename : PKTMODE.ASM

version equ 1

; Russell Nelson, Clarkson University. September 14, 1989
; Copyright, 1989, Russell Nelson

; This program is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation, version 1.
;
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this program; if not, write to the Free Software
; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

include defs.asm

code segment word public
assume cs:code, ds:code

org 80h
phd_dioa label byte

org 100h
start:
jmp start_1

copyleft_msg label byte
db "Packet mode version ",'0'+majver,".",'0'+version," copyright 1990, Russell Nelson.",CR,LF
db "This program is free software; see the file COPYING for details.",CR,LF
db "NO WARRANTY; see the file COPYING for details.",CR,LF
crlf_msg db CR,LF,'$'

int_pkt macro
pushf
cli
call their_isr
endm

their_isr dd ?
packet_int_no db ?,?,?,?
packet_mode dw -1,?

handle dw 0
this_mode dw ?
bogus_type db 0,0 ;totally bogus type code.

signature db 'PKT DRVR',0
signature_len equ $-signature
no_signature_msg db "No packet driver at that address",'$'
usage_msg db "usage: pktmode []",'$'
bad_handle_msg db "Bad handle error",'$'
bad_mode_msg db "Bad mode error",'$'
bad_error_msg db "Unknown error",'$'

not_implemented db "xx ",'$'
current_mode db "-> ",'$'
two_spaces db " ",'$'

mode_names dw mode_1_msg,mode_2_msg,mode_3_msg,mode_4_msg
dw mode_5_msg,mode_6_msg

mode_1_msg db "1) Turn off receiver",CR,LF,'$'
mode_2_msg db "2) Receive only packets sent to this interface",CR,LF,'$'
mode_3_msg db "3) Mode 2 plus broadcast",CR,LF,'$'
mode_4_msg db "4) Mode 3 plus limited multicast",CR,LF,'$'
mode_5_msg db "5) Mode 3 plus all multicast",CR,LF,'$'
mode_6_msg db "6) All packets",CR,LF,'$'


usage_error:
mov dx,offset usage_msg
error:
mov ah,9
int 21h
jmp all_done

start_1:
cld

mov dx,offset copyleft_msg
mov ah,9
int 21h

mov si,offset phd_dioa+1
cmp byte ptr [si],CR ;end of line?
je usage_error

mov di,offset packet_int_no
call get_number
mov di,offset packet_mode
call get_number

mov ah,35h ;get their packet interrupt.
mov al,packet_int_no
int 21h
mov their_isr.offs,bx
mov their_isr.segm,es

lea di,3[bx]
mov si,offset signature
mov cx,signature_len
repe cmpsb
je signature_ok
mov dx,offset no_signature_msg
jmp error
bad_j_1:
jmp bad
signature_ok:

push ds
mov ax,1ffh ;driver_info
int_pkt
pop ds
call fatal_error

mov ah,2 ;access all packets.
mov al,ch ;their class from driver_info().
mov bx,dx ;their type from driver_info().
mov dl,cl ;their number from driver_info().
mov cx,2 ;use a type length of 2.
mov si,offset bogus_type
push cs ;es:di -> our receiver.
pop es
mov di,offset our_recv
int_pkt
call fatal_error
mov handle,ax

mov cx,packet_mode
cmp cx,-1
je get_mode

mov ah,20 ;set the receive mode.
mov bx,handle
int_pkt
jc bad_j_1
jmp okay
get_mode:
mov ah,21 ;get the receive mode.
mov bx,handle
int_pkt
jc bad
mov packet_mode,ax

mov this_mode,1 ;start trying with mode 1.
try_mode:
cmp this_mode,6 ;have we hit the last mode?
ja no_more_modes ;yes.

mov ah,20 ;set the receive mode.
mov bx,handle
mov cx,this_mode
int_pkt
mov dx,offset not_implemented
jc tried_mode ;we tried it, and it didn't work.
mov dx,offset current_mode
mov cx,this_mode ;is this the current mode?
cmp packet_mode,cx
je tried_mode
mov dx,offset two_spaces
tried_mode:
mov ah,9 ;print either " ", "xx", or "->"
int 21h

mov bx,this_mode ;print the name of this mode.
shl bx,1
mov ah,9
mov dx,mode_names[bx-2]
int 21h

inc this_mode ;try the next mode.
jmp try_mode

no_more_modes:

mov ah,20 ;set the receive mode.
mov bx,handle
mov cx,packet_mode
int_pkt

all_done:
xor bx,bx ;only release the handle once.
xchg bx,handle
or bx,bx
je all_done_1 ;we've already released it.
mov ah,3 ;release_type
int_pkt
jc bad
all_done_1:
int 20h

bad:
call print_error
okay:
jmp all_done


our_recv:
or ax,ax ;first or second call?
jne our_recv_1 ;second -- we ignore the packet
push cs
pop es
mov di,offset our_buffer
our_recv_1:
db 0cbh ;masm 4.0 doesn't grok "retf"


include getnum.asm
include skipblk.asm
include getdig.asm
include pkterr.asm
include chrout.asm

our_buffer label byte

code ends

end start