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CLIENT.ASM
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Assembly Source File
|
1991-04-19
|
4KB
|
160 lines
title simple file transfer client
include asm.inc
include netbios.inc
public main
.stack
.const
ertx_no_server db 'CALL failed. Probably no server.',0
ertx_driver db 'No NetBIOS driver',0
ertx_send db 'SEND failed',0
ertx_receive db 'RECEIVE failed',0
ertx_disk_full db 'Disk full',0
ertx_cannot_open db 'Cannot open output file',0
calling_text db 'Calling server',0
low_iq_client_text db 'Low IQ Client',0
low_iq_server_text db 'Low IQ Server',0
help_text db 'client <source> <destination>',13,10
db 'copies <source> file from file server to <destination>.',13,10
db 'e.g. client \test\remote.txt local.txt',0
.data?
extrn argc:word,argv:dword
call_ncb ncb <>
;
; the order of these four objects is important
;
position_req dd ? ; file position requested for transfer
length_req dd ? ; length of transfer request
direction_flag db ? ; 'r' for receive, 's' for send
filename_req db FILENAME_MAX dup(?) ; requested file and path
db ? ; (ensure path is asciiz)
session_number db ?
file_buffer db 512 dup(?)
.code
extn exit_program,netbios_check,puts,clear_ncb,strcpy,netbios_call
extn strncpy,netbios_send_wait,open_output_file,netbios_receive_wait
extn write_to_file,close_file,netbios_add_name,netbios_delete_name
;; help
;
help proc
lea si,help_text
call puts
jmp exit_program
help endp
;; main
;
main proc
assume ds:DGROUP ; (test program is small model)
cmp argc,3
jb help ; if not enough arguments
call netbios_check
jnc mai1
jmp mai4 ; if no netbios driver
mai1: lea si,low_iq_client_text ; register name with netbios driver
call netbios_add_name
lea si,calling_text ; *Calling server*
call puts
lea si,call_ncb ; build CALL control block
call clear_ncb
lea si,low_iq_server_text ; set client and server names
lea di,call_ncb.Ncb_CallName
call strcpy
lea si,low_iq_client_text
lea di,call_ncb.Ncb_Name
call strcpy
lea si,call_ncb
mov Ncb_Rto[si],-1 ;10*2 ; receive timeout is 10 seconds
mov Ncb_Sto[si],-1 ;5*2 ; transmit timeout is 5 seconds
mov Ncb_Command[si],NB_CALL_WAIT
call netbios_call
jc mai5 ; if no server (probably)
mov al,Ncb_Lsn[si]
mov session_number,al
mov ax,-1 ; request entire file
mov wptr length_req,ax
mov wptr length_req+2,ax
mov direction_flag,'r' ; r is a read request to server
lds si,argv[bp] ; process server file name
mov si,[si+2]
lea di,filename_req
mov cx,size filename_req
call strncpy
mov ax,@data
mov ds,ax
lea cx,[di+1] ; send request packet with file
lea di,position_req ; position, maximum length, direction
sub cx,di ; and filename
mov al,session_number[bp]
call netbios_send_wait
jc mai6 ; if SEND failed
lds si,argv[bp] ; open output file
mov si,[si+4]
call open_output_file
jc mai7 ; if open failed
mov ax,@data
mov ds,ax
mai2: mov al,session_number ; receive data from file server
mov cx,size file_buffer
lea di,file_buffer
call netbios_receive_wait
jc mai8 ; if error
jcxz mai3 ; if end of file (hang up)
call write_to_file
jnc mai2 ; if write OK
lea si,ertx_disk_full ; *Disk full*
call puts
mai3: call close_file
jmp mai10
mai4: lea si,ertx_driver ; *No NetBIOS driver*
call puts
jmp exit_program
mai5: lea si,ertx_no_server ; *CALL failed. Probably no server*
jmp mai9
mai6: lea si,ertx_send ; *SEND failed*
jmp mai9
mai7: lea si,ertx_cannot_open ; *Cannot open output file*
jmp mai9
mai8: lea si,ertx_receive ; *RECEIVE failed*
mai9: call puts
mai10: lea si,low_iq_client_text ; delete client's name
call netbios_delete_name
jmp exit_program
main endp
end