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mssser.asm
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Assembly Source File
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1993-07-12
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70KB
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2,244 lines
NAME mssser
; File MSSSER.ASM
include mssdef.h
; Copyright (C) 1985, 1993, Trustees of Columbia University in the
; City of New York. Permission is granted to any individual or institution
; to use this software as long as it is not sold for profit. This copyright
; notice must be retained. This software may not be included in commercial
; products without written permission of Columbia University.
;
; Edit history:
; 27 August 1992 version 3.13
; 6 Sept 1991 version 3.11
; Last edit 19 April 1993
public bye, finish, remote, get, server, denyflg, srvtmo
public luser, lpass
data segment
extrn flags:byte, trans:byte, curdsk:byte, diskio:byte, auxfile:byte
extrn comand:byte, filtst:byte, maxtry:byte, dtrans:byte
extrn fmtdsp:byte, errlev:byte, fsta:word, kstatus:word
extrn rpacket:byte, encbuf:byte, decbuf:byte, sstate:byte
extrn rstate:byte, pktnum:byte, windlow:byte, takadr:word
extrn prmptr:word, chkparflg:byte
scrser equ 0209H ; place for server state display line
scrmsg equ 0e16H ; place for Last message
remcmd db 0 ; Remote command to be executed
rempac db 0 ; Packet type: C (host) or G (generic)
remlen db 0 ; length of following text field
ermes6 db 'Filename too long for packet',0
cemsg db 'User intervention',0
infms1 db 'Server mode: type C or Control-C to exit',cr,lf,'$'
infms2 db cr,lf,'?More parameters are needed$'
infms3 db 'REMOTE command reply',0 ; for transaction logging
infms4 db 'Help text',0 ; filename for REM Help reply
inthlp db cr,lf,' Time-limit to remain in Server mode, seconds or'
db ' specific hh:mm:ss (24h clock).'
db cr,lf,' SET TIMER ON to time. Return for no time limit.$'
remms1 db ' Unknown server command',0
remms2 db ' Invalid login information',0
remms3 db ' Kermit-MS Server ready',0
remms5 db ' File not found',0
remms6 db ' Command failed',0
remms7 db ' REMOTE LOGIN is required',0
remms8 db ' Command succeeded',0
remms9 db ' Command is Disabled',0
remms10 db ' Could not create work file',0
byemsg db ' Goodbye!',0
whomsg db ' Just this Server',0
spcmsg db ' bytes available on drive ' ; remote space responses
spcmsg1 db ' ',0
spcmsg2 db ' Drive '
spcmsg3 db ' : is not ready',0
user db ' Username: ',0 ; for Remote Login, asciiz
password db ' Password: ',0 ; for Remote Login and Remote CD
account db ' Account: ',0 ; for Remote Login
slogin db 0 ; non-zero if successful local login
luser db 17 dup (0) ; local Username, case insenstitive
lpass db 17 dup (0) ; local Password, case sensitive
srvtmp db ' > :$kermit$.tmp',0 ; asciiz, kermit's temp output file
delstr db 'del ',0
dirstr db 'dir ',0
crlf db cr,lf,'$'
emptymsg db 0 ; empty asciiz msg
skertmp dw 0 ; REMOTE KERMIT work word
denyflg dw 0 ; bit field of denied commands
temp dw 0
temp2 dw 0
cnt dw 0
bufptr dw 0
dsptmp db 0 ; temp to hold fmtdsp during serving
srvtmo db 0 ; idle NAK time, default is no NAKs
srvtime db 0 ; non-zero if timing Server residence
remfnm db ' Remote Source File: ',0 ; asciiz
lclfnm db ' Local Destination File: ',0 ; asciiz
filhlp db ' File name to use locally$'
filmsg db ' Remote filename, or press ENTER for prompts$'
frem db ' Name of file on remote system $'
genmsg db ' Enter text to be sent to remote server $'
numhlp db ' number$'
xfrhlp db ' character set identifier string$'
tmpbuf db 20 dup (0)
srvbuf db 80 dup (0) ; place After tmpbuf, for status
savflg flginfo <> ; save area for flags.*
savflgl equ $-savflg ; length
savdtr trinfo <> ; save area for dtrans.*
savdtrl equ $-savdtr ; length
savtr trinfo <> ; save area for trans.*
savmaxtry db 0 ; save area for maxtry
srvchr db 'SRGIECK' ; server cmd characters, use w/srvfun
srvfln equ $-srvchr ; length of table
srvfun dw srvsnd,srvrcv,srvgen,srvini,srverr,srvhos,srvker ; for srvchr
srvch2 db 'CDEFHLMSTUW' ; server commands, use with srvdsp
srvfl2 equ $-srvch2
srvdsp dw srvcwd,srvdir,srvdel,srvfin,srvhlp,srvlog,srvmsg
dw srvset,srvtyp,srvspc,srvwho
remhlp db cr,lf,' Command Action performed by the server Kermit'
db cr,lf,' ------- -------------------------------------'
db cr,lf,' CD/CWD change working directory' ; Answer to
db cr,lf,' Delete a file' ; local
db cr,lf,' Directory filespec' ; REM HELP
db cr,lf,' Help show server''s remote help screen'
db cr,lf,' Host command (to remote operating system)'
db cr,lf,' Kermit command (to Kermit server)'
db cr,lf,' Login name password to a Kermit server'
db cr,lf,' Logout exit remote Kermit (but keep remote host)'
db cr,lf,' Message short one line message'
db cr,lf,' Print local file (on server''s printer)'
db cr,lf,' Set command (modify server)'
db cr,lf,' Space drive/directory'
db cr,lf,' Type a file on this screen'
db cr,lf,' Who user parameters$'
; Answer from Server to REMOTE HELP
hlprem db cr,lf,'Kermit-MS Server commands:',lf
db cr,lf,'GET filespec '
db 'REMOTE DIRECTORY filespec REMOTE PRINT filespec'
db cr,lf,'SEND filespec '
db 'REMOTE HELP this text REMOTE SET command'
db cr,lf,'BYE, FINISH, REMOTE LOGOUT'
db 'REMOTE HOST command REMOTE SPACE drive-letter'
db cr,lf,'REMOTE CD/CWD directory '
db 'REMOTE LOGIN name password REMOTE TYPE filespec'
db cr,lf,'REMOTE DELETE filespec '
db 'REMOTE MESSAGE 1-line msg REMOTE WHO'
db 0
remtab db 15 ; 15 entries
mkeyw 'CD',remcwd
mkeyw 'CWD',remcwd
mkeyw 'Delete',remdel
mkeyw 'Directory',remdir
mkeyw 'Help',remhel
mkeyw 'Host',remhos
mkeyw 'Kermit',remker
mkeyw 'Login',remlogin
mkeyw 'Logout',remlogout
mkeyw 'Message',remmsg
mkeyw 'Print',remprn ; top of SEND procedure in msssen
mkeyw 'Set',remset
mkeyw 'Space',remdis
mkeyw 'Type',remtyp
mkeyw 'Who',remwho
setval dw 300,302,310 ; answer REMOTE SET workers
dw 400,401,402,403,404,405,406
setvlen equ ($-setval)/2 ; number of entries
setvec dw sftype,sfcoll,sfinc ; routines paralleling setval
dw sblkck,srpkt,srtmo,sretry,sstmo,sxfrch,swind
remstt1 db 9 ; REMOTE SET top level table
mkeyw 'Attributes',1
mkeyw 'File',2
mkeyw 'Incomplete',310
mkeyw 'Block-check',400
mkeyw 'Receive',3
mkeyw 'Retry',403
mkeyw 'Server',404
mkeyw 'Transfer',405
mkeyw 'Window-slots',406
remsat1 db 2 ; REMOTE SET ATTRIBUTES
mkeyw 'IN',0
mkeyw 'OUT',100
remsat2 db 17 ; REMOTE ATTRIBUTES {IN} item
; REM ATT {OUT} item is 100 greater
mkeyw 'All',132
mkeyw 'Length',133
mkeyw 'Type',134
mkeyw 'Date',135
mkeyw 'Creator',136
mkeyw 'Account',137
mkeyw 'Area',138
mkeyw 'Block-size',139
mkeyw 'Access',140
mkeyw 'Encoding',141
mkeyw 'Disposition',142
mkeyw 'Protection',143
mkeyw 'Gprotection',144
mkeyw 'System-ID',145
mkeyw 'Format',146
mkeyw 'Sys-Info',147
mkeyw 'Byte-count',148
remsfit db 5 ; REMOTE SET FILE
mkeyw 'Type',300
mkeyw 'Names',301
mkeyw 'Collision',302
mkeyw 'Replace',303
mkeyw 'Incomplete',310
remsfty db 2 ; REMOTE SET FILE TYPE
mkeyw 'Text',0
mkeyw 'Binary',1
remsfna db 2 ; REMOTE SET FILE NAME
mkeyw 'Converted',0
mkeyw 'Literal',1
remsfco db 7 ; REMOTE SET FILE COLLISION
mkeyw 'Append',3
mkeyw 'Ask',5
mkeyw 'Backup',2
mkeyw 'Discard',4
mkeyw 'Rename',0
mkeyw 'Replace',1
mkeyw 'Update',6
remsfre db 2 ; REMOTE SET FILE REPLACE
mkeyw 'Preserve',0
mkeyw 'Default',1
remsfin db 2 ; REMOTE SET FILE INCOMPLETE
mkeyw 'Discard',0
mkeyw 'Keep',1
remsrcv db 2 ; REMOTE SET RECEIVE
mkeyw 'Packet-length',401
mkeyw 'Timeout',402
remsxfr db 1 ; REMOTE SET TRANSFER
mkeyw 'Character-set',405
onoff db 2 ; ON, OFF table
mkeyw 'off',0
mkeyw 'on',1
data ends
code1 segment
extrn bufclr:far, pakptr:far, bufrel:far, makebuf:far, chkwind:far
extrn firstfree:far, getbuf:far, pakdup:far, rpack:far, fcsrtype:far
code1 ends
code segment
extrn comnd:near, init:near, serini:near, rrinit:near
extrn read2:near, rpar:near, spar:near, intmsg:near, sparmax:near
extrn serhng:near, clrbuf:near, clearl:near
extrn dodec: near, doenc:near, packlen:near, send10:near, errpack:near
extrn pktsize:near, poscur:near, lnout:near, clrmod:near, ermsg:near
extrn rprpos:near, crun:near, prompt:near, prtscr:near, strcat:near
extrn strlen:near, strcpy:near, fparse:near, isfile:near, ihostr:near
extrn inptim:near, chktmo:near, pcwait:near
extrn nakpak:near, sndpak:near, response:near
extrn msgmsg:near, ackpak:near, dskspace:near, cdsr:near, dec2di:near
extrn takopen:near, takclos:near, setcom:near
extrn remprn:near
assume cs:code, ds:data, es:nothing
; Server command
SERVER PROC NEAR
mov ah,cmword ; get a word
mov dx,offset srvbuf ; place to put text
mov word ptr srvbuf,0 ; clear
mov bx,offset inthlp ; help message
call comnd ; get the pattern text
jnc serv1a ; nc = success
ret ; failure
serv1a: mov ah,cmeol
call comnd
jnc serv1b ; nc = success
ret
serv1b: mov srvtime,0 ; assume not doing timed residence
mov si,offset srvbuf
mov al,[si]
or al,al ; any time given?
jz serv4 ; z = no
cmp al,'0' ; numeric or colon?
jb serv2 ; b = not proper time value
cmp al,':' ; this covers the desired range
ja serv2 ; a = no proper time value
call inptim ; convert text to timeout tod
jnc serv3 ; c = syntax errors in time
serv2: stc ; failure
ret
serv3: mov srvtime,1 ; say doing timed residence
serv4: or flags.remflg,dserver ; signify we are a server now
call clrbuf ; clear serial port buffer of junk
test denyflg,pasflg ; Login required?
jnz serv4a ; nz = no
or denyflg,pasflg ; assume no login info required
mov al,luser ; check for user/password required
or al,lpass ; if both null then no checks
jz serv4a ; z = null, no name/pass required
and denyflg,not pasflg ; say need name/password
serv4a: mov dsptmp,0 ; assume no formatted server display
mov al,dtrans.xchset ; reset Transmission char set
mov trans.xchset,al ; to the current user default
mov al,dtrans.xtype ; ditto for File Type
mov trans.xtype,al
mov si,offset flags ; main flags structure
mov di,offset savflg ; save area
mov cx,savflgl ; length in bytes
push es
push ds
pop es
cld
rep movsb ; save all of them
mov si,offset dtrans ; default transmission parameters
mov di,offset savdtr ; save area
mov cx,savdtrl ; length
rep movsb ; save all of them
mov si,offset trans ; active transmission paramters
mov di,offset savtr ; save area
mov cx,savdtrl ; same length
rep movsb
mov al,maxtry
mov savmaxtry,al
pop es
mov si,offset rpacket ; dummy packet
mov rpacket.datlen,0 ; declare to be empty
call spar ; setup minimum operating conditions
test flags.remflg,dquiet ; quiet display?
jnz serv9 ; nz = yes
mov ah,prstr
mov dx,offset crlf
int dos
test flags.remflg,dserial ; serial display?
jnz serv5 ; nz = yes
call init ; init formatted display
call clrmod ; but no modeline yet
mov dl,fmtdsp
mov dsptmp,dl ; remember state of fmtdsp
jmp short serv9
serv5: mov ah,prstr
mov dx,offset infms1 ; say now in server mode
int dos
; TOP OF SERVER IDLE LOOP
serv9: test flags.remflg,dquiet+dserial ; quiet or serial display?
jnz serv10 ; nz = yes, do not change screen
mov dx,scrmsg ; move cursor to Last message area
add dx,0100H ; look at line below (DOS does CR/LF first)
call poscur
call clearl ; and clear the line
mov dl,cr ; set cursor to left margin
mov ah,conout
int dos
serv10: xor ax,ax
mov flags.cxzflg,al ; clear ^X, ^Z, ^C seen flag
mov flags.xflg,al ; reset X packet flag
mov auxfile,al ; say no override filename
mov srvbuf,al ; work buffer, clear
mov al,dsptmp ; get our fmtdsp state
mov fmtdsp,al ; and restore it
mov trans.windo,1 ; but only 1 window slot here
mov cx,drpsiz ; default receive pkt length (94)
call makebuf ; remake all buffers for new windowing
call packlen ; determine max packet length
mov dtrans.windo,31 ; set max windowing abilities
mov trans.windo,31
mov trans.chklen,1 ; checksum len = 1
mov pktnum,0 ; pack number resets to 0
mov al,srvtmo ; use server mode timeout
or al,al ; is it zero?
jz serv10b ; z = yes, use regular timeout
mov trans.stime,al ; use this interval in the idle loop
serv10b:call serini ; init serial line, just in case
jnc serv11 ; nc = success
jmp serv20 ; c = failure
serv11: cmp srvtime,0 ; doing timed residence?
je serv12 ; e = no
call chktmo ; check for time to exit Server mode
jnc serv12 ; nc = ok
jmp serv20 ; c = timeout, exit server mode
serv12: mov windlow,0 ; reset windowing
mov pktnum,0 ; packet number to be used
call getbuf ; get a buffer
mov chkparflg,1 ; check for unexpected parity
call rpack ; receive a packet, si has buffer ptr
mov al,dtrans.stime ; get default timeout interval
mov trans.stime,al ; restore active timeout interval
jc serv13 ; c = timeout, bad pkt, intervention
mov al,[si].seqnum ; sequence number received
mov rpacket.seqnum,al ; for our reply
or al,al ; must be sequence number of zero
jnz serv13 ; nz = bad packet
mov ah,[si].pktype
cmp ah,'I' ; never "decode" S, I, and A packets
je serv17 ; e = I packet
cmp ah,'S'
je serv17
cmp ah,'A'
je serv17
call dodec ; decode packet to decbuf
call bufrel ; release the packet buffer
jmp short serv17 ; dispatch on packet type in ah
serv13: cmp flags.cxzflg,'C' ; Control-C?
je serv20 ; e = yes, exit server mode
serv14: cmp flags.cxzflg,'E' ; ^E protocol abort?
jne serv15 ; ne = no
call bufclr ; clear all buffers
mov dx,offset cemsg ; user intervention message for error packet
call ermsg
mov bx,dx
call errpack ; send error message
call intmsg ; show interrupt msg for Control-C-E
jmp serv9
serv15: cmp [si].pktype,'T' ; packet type of time-out?
jne serv16 ; ne = no
cmp srvtime,0 ; doing timed residence?
je serv15a ; e = no
call chktmo ; check for time to exit Server mode
jc serv20 ; c = timeout, exit server mode
serv15a:cmp srvtmo,0 ; zero server pkt timeout?
je serv16 ; e = yes, no NAKing
mov rpacket.seqnum,0
call nakpak ; NAK the packet, uses rpacket
serv16: call bufrel ; release the buffer
jmp serv9 ; to top of idle loop
serv17: cmp [si].pktype,'N' ; received a NAK?
je serv18 ; e = yes, ignore it
push es
push ds
pop es ; set es to data segment
mov di,offset srvchr ; server characters
mov cx,srvfln ; length of command set
mov al,ah ; packet type
cld
repne scasb ; hunt for it
pop es
je serv19 ; e = found that kind
mov dx,offset remms1 ; say unknown server command
call ermsg
mov bx,dx
call errpack ; tell the other kermit
serv18: jmp serv9 ; get another server command
serv19: sub di,offset srvchr+1 ; find offset, +1 for pre-increment
shl di,1 ; convert to word index
call srvfun[di] ; call the appropriate handler
jc serv20 ; c = someone wanted to exit
jmp serv9 ; get another server command
serv20: mov di,offset flags ; main flags structure
mov si,offset savflg ; save area
mov cx,savflgl ; length in bytes
push es
push ds
pop es
mov al,flags.extflg ; leave server mode and Kermit flag
mov ah,flags.cxzflg ; interruption flag
cld
rep movsb ; restore all of them
mov di,offset dtrans ; default transmission parameters
mov si,offset savdtr ; save area
mov cx,savdtrl ; length
rep movsb ; restore all of them
mov di,offset trans ; active transmission paramters
mov si,offset savtr ; save area
mov cx,savdtrl ; same length
rep movsb
mov flags.extflg,al ; set flag as current
;; mov flags.cxzflg,ah ; restore interruption flag
mov al,savmaxtry
mov maxtry,al
pop es
mov al,1 ; underline cursor
call fcsrtype ; set IBM-PC cursor to underline
call rprpos ; put prompt here
and flags.remflg,not dserver ; say not a server anymore
clc
ret
SERVER ENDP
; commands executable while acting as a server
; Validate LOGIN status. Return carry set if login is ok, else
; send Error Packet saying Login is required (but has not been done) and
; return carry clear. Carry bit is this way because returning to the server
; idle loop with carry set exits the server mode.
logchk proc near
test denyflg,pasflg ; login required?
jnz logchk1 ; nz = no (disabled)
cmp slogin,0 ; logged in yet?
jne logchk1 ; ne = yes
mov dx,offset remms7 ; reply REMOTE LOGIN is required
call ermsg
mov bx,dx ; errpack works from bx
mov trans.chklen,1 ; reply with 1 char checksum
call errpack
clc ; say cannot proceed with command
ret
logchk1:stc ; say can proceed with command
ret
logchk endp
; srvsnd - receives a file that a remote kermit is sending
srvsnd proc near
call logchk ; check login status
jc srvsnd1 ; c = ok
ret ; else have sent error packet
srvsnd1:call init ; setup display form
xor ax,ax
test denyflg,sndflg ; command disabled?
jz srvsnd2 ; z = no
mov al,'.' ; dot+nul forces use of current dir
srvsnd2:mov word ptr auxfile,ax ; override name
mov rstate,'R' ; receive initiate state
jmp read2 ; packet pointer is SI, still valid
srvsnd endp
; srvrcv - send a file to a distant kermit
srvrcv proc near
call logchk ; check login status
jc srrcv1 ; c = ok
ret ; else have sent error packet
srrcv1: mov si,offset decbuf ; received filename, asciiz from dodec
test denyflg,getsflg ; command enabled?
jz srrcv2 ; z = yes
mov dx,si ; source string, from other side
mov di,offset srvbuf ; local path
mov si,offset tmpbuf ; local filename
call fparse ; split string
srrcv2: mov di,offset diskio.string ; destination
call strcpy ; copy filename to diskio.string
mov auxfile,0 ; no alias name
mov sstate,'S' ; set sending state
jmp send10 ; this should send it
srvrcv endp
srverr proc near ; incoming Error packet
clc ; absorb and ignore
ret
srverr endp
; srvgen - G generic server command dispatcher
;
srvgen proc near
call bufrel ; release buffer
mov al,decbuf ; get first data character from pkt
cmp al,'I' ; LOGIN?
jne srvge1 ; ne = no
jmp srvlogin ; yes
srvge1: call logchk ; check login status
jc srvge2 ; c = ok
ret ; else have sent error packet
srvge2: push es
push ds
pop es ; set es to data segment
mov di,offset srvch2 ; command character list
mov cx,srvfl2 ; length of command set
cld
repne scasb ; hunt for it
pop es
jne srvgex ; ne = not found, complain
sub di,offset srvch2+1 ; find offset, +1 for pre-increment
shl di,1 ; convert to word index
jmp srvdsp[di] ; do the appropriate handler
srvgex: mov dx,offset remms1 ; reply Unknown server command
call ermsg
mov bx,dx
mov trans.chklen,1 ; reply with 1 char checksum
call errpack
clc
ret
srvgen endp
; srvlog - respond to host's BYE and LOGOUT
srvlog proc near
call srvfin ; do FIN part
pushf ; save flag for the very end
jnc srvlog1 ; nc = stay active (command denied)
mov flags.extflg,1 ; leave server mode and Kermit
srvlog1:call serhng ; hangup the phone and return
mov di,offset flags ; main flags structure
mov si,offset savflg ; save area
mov cx,savflgl ; length in bytes
push es
push ds
pop es
mov al,flags.extflg ; leave server mode and Kermit flag
cld
rep movsb ; restore all of them
mov di,offset dtrans ; default transmission parameters
mov si,offset savdtr ; save area
mov cx,savdtrl ; length
rep movsb ; restore all of them
mov di,offset trans ; active transmission paramters
mov si,offset savtr ; save area
mov cx,savdtrl ; same length
rep movsb
mov flags.extflg,al ; make flag current
mov al,savmaxtry
mov maxtry,al
pop es
popf ; recover carry flag, set = exit
ret
srvlog endp
; srvfin - respond to remote host's Fin command
srvfin proc near
mov slogin,0 ; say not logged in anymore
mov si,offset byemsg ; add brief msg of goodbye
mov di,offset encbuf ; packet's data field
call strcpy ; copy msg to pkt
mov dx,si ; strlen works on dx
call strlen
push si
mov si,offset rpacket ; get a reply buffer
call doenc ; encode the reply in encbuf
pop si
mov trans.chklen,1 ; reply with 1 char checksum
call ackpak
mov ax,100 ; wait 0.1 sec for client to settle
call pcwait
mov si,offset rpacket ; dummy packet
mov rpacket.datlen,0 ; declare to be empty
call spar ; setup minimum operating conditions
test denyflg,finflg ; command enabled?
jz srfin2 ; z = yes
clc ; stay in server mode
ret
srfin2: stc ; stc exits server mode
ret
srvfin endp
; srvcwd - handle other side's Remote CWD dirspec
srvcwd proc near
mov trans.chklen,1 ; reply with 1 char checksum
test denyflg,cwdflg ; is command enabled?
jz srcwd1 ; z = yes
mov dx,offset remms9 ; say command is disabled
call ermsg ; to us and
mov bx,dx
call errpack ; to the other Kermit
clc
ret
srcwd1: mov si,offset decbuf+1 ; point to byte count
xor bh,bh
mov bl,[si]
sub bl,' ' ; remove ascii bias from byte count
inc si
mov word ptr[si+bx],0 ; make ASCIIZ w/one extra null
call cdsr ; CD common sub-routine
mov si,dx ; returns msg in dx
mov di,offset encbuf ; put in encode buffer
call strcpy
mov dx,di
call strlen ; get its length to cx
mov si,offset rpacket ; use this packet for the reply
call doenc ; encode reply
call ackpak ; send ACK with data
clc
ret
srvcwd endp
; srvtyp - handle other side's Remote Type filename request
; expects "data" to hold Tcfilename where c = # bytes in filename
srvtyp proc near
cmp decbuf+1,0 ; any data in packet
je srtyp2 ; e = no
mov cl,decbuf+1 ; get the filename byte count
sub cl,' ' ; ascii to numeric
jle srtyp2 ; le = no filename or error in length
xor ch,ch ; set up counter
mov si,offset decbuf+2 ; received filename, asciiz from rpack
mov di,si
add di,cx
mov byte ptr [di],0 ; make string asciiz
test denyflg,typflg ; paths permitted?
jz srtyp1 ; z = yes, else use just filename part
mov di,offset srvbuf ; local path
mov si,offset tmpbuf ; local filename
mov dx,offset decbuf+2 ; local string
call fparse ; split string
srtyp1: mov di,offset diskio.string ; copy local filename to destination
mov ax,di ; pointer to filename, for isfile
call strcpy ; do the copy
call isfile ; does it exist?
jnc srtyp3 ; nc = yes
srtyp2: mov si,offset remms5 ; "File not found"
mov di,offset encbuf ; destination for message
call strcpy ; move the message
mov dx,di
call strlen ; length to cx
mov si,offset rpacket ; use this packet for reply
call doenc ; encode
mov trans.chklen,1 ; reply with 1 char checksum
call ackpak ; send ACK with message
clc
ret
srtyp3: mov flags.xflg,1 ; say use X packet rather than F pkt
mov auxfile,0 ; no alias name
mov sstate,'S' ; remember state
jmp send10 ; this should send it
srvtyp endp
; srvdir - handle other side's Remote Dir filespec(optional) request
srvdir proc near
mov di,offset decbuf+2 ; received filespec, asciiz from rpack
xor cx,cx ; assume no data in packet
mov cl,decbuf+1 ; get the filename byte count
cmp cl,' ' ; byte count present and > 0?
jg srdir1 ; g = yes
mov word ptr [di],0 ; clear data field
jmp short srdir2 ; 0 = no info in pkt
srdir1: sub cl,' ' ; ascii to numeric
add di,cx ; step to end of filename, terminate
mov word ptr [di],0 ; ensure string is asciiz
mov di,offset srvbuf ; local path
mov si,offset tmpbuf ; local filename
mov dx,offset decbuf+2 ; local string
call fparse ; split string
test denyflg,dirflg ; paths permitted?
jz srdir2 ; z = yes, else use just filename part
mov si,offset tmpbuf ; copy local filename to
mov di,offset decbuf+2 ; final filename
call strcpy ; copy just filename to buffer
srdir2: mov cl,curdsk ; current drive number
add cl,'A'-1 ; to letter
cmp decbuf+3,':' ; drive specified?
jne srdir3 ; ne = no
cmp decbuf+2,0 ; drive letter specified?
je srdir3 ; e = no
mov cl,decbuf+2 ; get drive letter
and cl,5fh ; convert to upper case
srdir3: call dskspace ; check if drive ready (drive => CL)
jnc srdir5 ; nc = success (drive is ready)
mov spcmsg3,cl ; insert drive letter
mov si,offset spcmsg2 ; say drive not ready
mov di,offset encbuf ; destination for message
call strcpy ; move the message
mov dx,di
call strlen ; length to cx
mov si,offset rpacket ; use this packet for reply
call doenc ; encode
mov trans.chklen,1 ; reply with 1 char checksum
call ackpak ; send ACK with message
clc
ret
srdir5: mov di,offset srvbuf ; work area
mov si,offset dirstr ; prepend "dir "
call strcpy
mov si,offset decbuf+2 ; directory spec, asciiz
mov di,offset srvbuf
call strcat
; srdir6 does common processing for both REM DIR & REM HOST
SRDIR6: mov si,di ; srvbuf
mov di,offset auxfile ; send-as name is command line
call strcpy
mov dl,curdsk
add dl,'A'-1 ; change to letter
mov srvtmp+2,dl ; insert current disk drive
mov si,offset srvtmp ; add redirection tag " >d:$kermit$.tmp"
mov di,offset srvbuf
call strcat
mov si,offset srvbuf ; command pointer for crun
call crun
; fall thru! jmp srvtail ; send contents of temp file
srvdir endp
; Send contents of srvtmp+2 temporary file, or error packet if it does not
; exist.
srvtail proc near
mov si,offset srvtmp+2 ; get name of temp file
mov di,offset diskio.string ; destination
call strcpy ; copy it there
mov ax,di ; filename pointer for isfile
call isfile ; did we make the temp file?
jnc srvtai1 ; nc = yes
mov dx,offset remms10 ; "Could not create work file"
mov trans.chklen,1 ; reply with 1 char checksum
call ermsg
mov bx,dx
call errpack ; send the error message
clc
ret
srvtai1:mov flags.xflg,1 ; say use X rather than F packet
mov sstate,'S' ; remember state
call send10 ; this should send it
mov flags.xflg,0 ; clear flag
mov dx,offset srvtmp+2 ; name of temp file
mov ah,del2 ; delete the file
int dos
clc
ret ; return in any case
srvtail endp
; srvdel - handle other side's request of Remote Del filespec
srvdel proc near
test denyflg,delflg ; command enabled?
jz srvdel4 ; z = yes
mov dx,offset remms9 ; else give a message
mov trans.chklen,1 ; reply with 1 char checksum
call ermsg
mov bx,dx
call errpack ; back to local kermit
clc
ret
srvdel4:cmp decbuf+1,0 ; any data?
je srdel1 ; e = no
xor bh,bh
mov bl,decbuf+1 ; get the filename byte count
sub bl,' ' ; ascii to numeric
jle srdel3 ; le = nothing there
mov decbuf [bx+2],0 ; plant terminator
mov ax,offset decbuf+2 ; point to filespec
call isfile ; is/are there any to delete?
jc srdel1 ; c = there is none
test byte ptr filtst.dta+21,1EH ; attr bits: is file protected?
jz srdel2 ; z = not protected
srdel1: mov si,offset remms5 ; "File not found"
mov di,offset encbuf ; destination for message
call strcpy ; move the message
mov dx,di
call strlen ; length to cx
mov si,offset rpacket ; use this packet for reply
call doenc ; encode
mov trans.chklen,1 ; reply with 1 char checksum
call ackpak ; send ACK with message
clc
ret
srdel2: mov di,offset encbuf ; work area
mov si,offset delstr ; prepend "del "
call strcpy
mov si,offset decbuf+2 ; append incoming filespec
call strcat ; append to "del "
mov si,di ; set pointer for crun
call crun
srdel3: mov dx,offset encbuf ; where command lies
call strlen ; length to cx
push si
mov si,offset rpacket ; packet to use for reply
call doenc ; encode reply
pop si
mov trans.chklen,1 ; reply with 1 char checksum
call ackpak
clc
ret
srvdel endp
; srvlogin - handle other side's request of REMOTE LOGIN, USERNAME, PASSWORD
srvlogin proc near
mov slogin,0 ; say not logged in yet
cmp luser,0 ; local username specified?
je srvlog9 ; e = no, do no checking
mov cl,decbuf+1 ; ascii byte count of username
sub cl,' ' ; to binary
jle srvlog8 ; le = nothing there
xor ch,ch
mov si,offset decbuf+2 ; source, username field
mov di,offset luser ; local username template
push cx
mov ax,cx ; external username length
mov dx,di
call strlen ; get length of local username
cmp ax,cx ; same lengths?
pop cx
jne srvlog8 ; ne = not same length
cld
srvlog2:lodsb ; remote char
mov ah,[di] ; local char
inc di
or ax,2020h ; lower case both
cmp ah,al ; same?
jne srvlog8 ; ne = no, fail
loop srvlog2 ; continue match
cmp lpass,0 ; local password specified?
je srclog6 ; e = no, don't check incoming p/w
mov cl,decbuf+1 ; username length
sub cl,' '
xor ch,ch ; clear high byte
mov si,offset decbuf+2 ; skip over username field
add si,cx ; password length byte
mov cl,[si] ; ascii count of password bytes
sub cl,' ' ; to binary
jc srvlog8 ; carry means no field
inc si ; start of password text
mov di,offset lpass ; local password text, case sensitive
push cx
mov ax,cx ; external password length
mov dx,di
call strlen ; length of local password
cmp ax,cx ; same?
pop cx
je srvlog5 ; e = yes
mov byte ptr [si],20h ; corrupt external password
jmp short srvlog8 ; fail
srvlog5:lodsb ; remote char
mov ah,[di] ; local char
inc di
cmp ah,al ; same?
jne srvlog8 ; ne = no, fail
loop srvlog5 ; do all chars
srclog6:mov slogin,1 ; declare user logged-in
jmp short srvlog9 ; ACK with brief message
srvlog8:mov si,offset remms2 ; say invalid login information
jmp short srvlog10
srvlog9:mov si,offset remms3 ; welcome aboard message
mov slogin,1 ; say logged in successfully
srvlog10:mov di,offset encbuf ; copy to here
call strcpy
mov dx,di ; where command lies
call strlen ; length to cx
push si
mov si,offset rpacket ; packet to use for reply
call doenc ; encode reply
pop si
mov trans.chklen,1 ; reply with 1 char checksum
call ackpak
clc
ret
srvlogin endp
; srvspc - handle other side's request of Remote Space
srvspc proc near
test denyflg,spcflg ; is command enabled?
jz srspc1 ; z = yes
mov dx,offset remms9 ; else give a message
mov trans.chklen,1 ; reply with 1 char checksum
call ermsg
mov bx,dx
call errpack ; back to local kermit
clc
ret
srspc1: xor cl,cl ; use current drive
cmp decbuf+1,0 ; any data?
je srspc2 ; e = no
mov cl,decbuf+2 ; get the drive letter
srspc2: call dskspace ; calculate space, get letter into CL
jnc srspc3 ; nc = success
mov spcmsg3,cl ; insert drive letter
mov di,offset encbuf ; encoder buffer
mov si,offset spcmsg2 ; give Drive not ready message
call strcpy
jmp short srspc4 ; send it
srspc3: mov spcmsg1,cl ; insert drive letter
mov di,offset encbuf ; destination
mov word ptr[di],' ' ; space space
add di,2 ; start number here
call lnout ; convert number to asciiz in [di]
mov si,offset spcmsg ; trailer of message
call strcat ; tack onto end of number part
srspc4: mov trans.chklen,1 ; reply with 1 char checksum
mov dx,offset encbuf
call strlen ; get data size into cx for doenc
mov si,offset rpacket
call doenc ; encode
call pktsize ; report packet size
call ackpak
clc
ret
srvspc endp
; srvwho - respond to remote host's WHO command.
srvwho proc near
mov si,offset whomsg ; add brief msg of just us chickens
mov di,offset encbuf ; encoder source field
call strcpy ; copy msg to pkt
mov dx,si ; strlen works on dx
call strlen
mov si,offset rpacket
call doenc ; encode reply, size is in cx
mov trans.chklen,1 ; reply with 1 char checksum
call ackpak
clc
ret
srvwho endp
; srvmsg - respond to remote host's Message (Send) command
; show message on our screen.
srvmsg proc near
cmp decbuf,0 ; any data in the packet?
jbe srvmsg2 ; e = no, just ack the message
cmp decbuf,'M' ; Message packet?
jne srvmsg2 ; ne = no, ack and forget
test flags.remflg,dquiet+dserial ; quiet or serial display?
jnz srvmsg1 ; nz = yes
mov dx,scrmsg ; move cursor to Last message area
call poscur
call clearl ; and clear the line
srvmsg1:xor ch,ch
mov cl,decbuf+1 ; data length
sub cl,' ' ; remove ascii bias
jle srvmsg2 ; le = nothing
mov di,offset decbuf+2 ; main part of message
call prtscr ; display cx chars on the screen
srvmsg2:mov rpacket.datlen,0 ; length
mov trans.chklen,1 ; reply with 1 char checksum
call ackpak
clc
ret
srvmsg endp
; srvhos - handle other side's request of REM Host command-line. [jrd]
; We execute the command with STDOUT redirected to $kermit$.tmp and then
; read and transmit that file to the other end. No such file results in
; returning just an error msg ACK packet
srvhos proc near
call logchk ; check login status
jc srvhos1 ; c = ok
ret ; else have sent error packet
srvhos1:test denyflg,hostflg ; command enabled?
jz srvhos2 ; z = yes
mov trans.chklen,1 ; reply with 1 char checksum
mov dx,offset remms9 ; else give a message
call ermsg
mov bx,dx
call errpack ; back to local kermit
clc
ret
srvhos2:mov si,offset decbuf ; received filename, asciiz from dodec
mov di,offset srvbuf ; destination
call strcpy ; copy data to srvbuf
jmp SRDIR6 ; do common completion code
srvhos endp
; Respond to other side's request of Remote Help. Write & read $kermit$.tmp
srvhlp proc near
mov dl,curdsk
add dl,'A'-1 ; change to letter
mov srvtmp+2,dl ; insert current disk drive
mov dx,offset srvtmp+2 ; use filename of d:$kermit$.tmp
mov ah,creat2 ; create the file
xor cx,cx ; attributes r/w
int dos
jc srvhlp1 ; c = could not open
mov dx,offset hlprem ; data to be sent, strlen uses dx
call strlen ; put string length in cx
mov bx,ax ; handle
mov ah,write2 ; write to file
int dos ; write the info
mov ah,close2 ; close the file so we can reread it below
int dos
srvhlp1:mov si,offset infms4 ; pseudo filename
mov di,offset auxfile ; send-as name
call strcpy ; copy it there
jmp srvtail ; send temporary file to remote screen
srvhlp endp
; srvker - handle other side's request of REM Kermit command-line.
srvker proc near
call logchk ; check login status
jc srvker8 ; c = ok
ret ; else have sent error packet
srvker8:test denyflg,kerflg ; command enabled?
jz srvker1 ; z = yes
mov trans.chklen,1 ; reply with 1 char checksum
mov dx,offset remms9 ; else give a message
call ermsg
mov bx,dx
call errpack ; back to local kermit
clc
ret
srvker1:call takopen ; open a Take file
jc srvker3 ; c = failed to obtain Take space
mov dx,prmptr ; get prompt
call prompt ; prompt user, set reparse address
mov bx,takadr ; pointer to Take structure
mov skertmp,bx ; remember it here for cleanup
mov [bx].taktyp,0ffh ; mark as a macro
mov dx,offset decbuf ; received command, asciiz
call strlen ; get length into cx
mov si,dx
srvker6:cmp byte ptr [si],' ' ; strip leading white space
ja srvker7 ; a = non-white
loop srvker6 ; continue
srvker7:cmp cx,8 ; need at least 8 chars "SET xx y"
jb srvker2 ; b = too few, bad command
mov ax,[si] ; get first two characters
or ax,2020h ; lower case them
cmp ax,'es' ; start of "SET"?
jne srvker2 ; ne = no, bad command
mov ax,[si+2] ; next two
or ax,2020h
cmp ax,' t' ; rest of "SET "?
jne srvker2 ; ne = no, bad command
add si,4 ; move to end of "SET "
sub cx,4
mov [bx].takcnt,cx ; number of bytes in command
push es
mov ax,[bx].takbuf ; segment of Take buffer
mov es,ax
mov di,1 ; place here (skip buf length byte)
cld
rep movsb
pop es
call setcom
jnc srvker3 ; nc = success
srvker2:mov si,offset remms6 ; "Command failed"
jmp short srvker4
srvker3:mov si,offset remms8 ; "Command succeeded"
srvker4:mov di,offset encbuf ; destination for message
call strcpy ; move the message
mov dx,di
call strlen ; length to cx
mov si,offset rpacket ; use this packet for reply
call doenc ; encode
mov trans.chklen,1 ; reply with 1 char checksum
call ackpak ; send ACK with message
mov ax,skertmp ; get old take address
cmp ax,takadr ; same (still in current Take)?
jne srvker5 ; ne = no
call takclos ; close the Take file
srvker5:clc
ret
srvker endp
; Command Code Values
; REMOTE SET ATTRIBUTES IN ALL 132 0 = OFF, 1 = ON
; REMOTE SET ATTRIBUTES IN LENGTH 133 0 = OFF, 1 = ON
; REMOTE SET ATTRIBUTES IN TYPE 134 0 = OFF, 1 = ON
; REMOTE SET ATTRIBUTES IN DATE 135 0 = OFF, 1 = ON
;X REMOTE SET ATTRIBUTES IN CREATOR 136 0 = OFF, 1 = ON
;X REMOTE SET ATTRIBUTES IN ACCOUNT 137 0 = OFF, 1 = ON
;X REMOTE SET ATTRIBUTES IN AREA 138 0 = OFF, 1 = ON
;X REMOTE SET ATTRIBUTES IN BLOCK-SIZE 139 0 = OFF, 1 = ON
;X REMOTE SET ATTRIBUTES IN ACCESS 140 0 = OFF, 1 = ON
;X REMOTE SET ATTRIBUTES IN ENCODING 141 0 = OFF, 1 = ON
;X REMOTE SET ATTRIBUTES IN DISPOSITION 142 0 = OFF, 1 = ON
;X REMOTE SET ATTRIBUTES IN PROTECTION 143 0 = OFF, 1 = ON
;X REMOTE SET ATTRIBUTES IN GPROTECTION 144 0 = OFF, 1 = ON
;X REMOTE SET ATTRIBUTES IN SYSTEM-ID 145 0 = OFF, 1 = ON
;X REMOTE SET ATTRIBUTES IN FORMAT 146 0 = OFF, 1 = ON
;X REMOTE SET ATTRIBUTES IN SYS-INFO 147 0 = OFF, 1 = ON
;X REMOTE SET ATTRIBUTES IN BYTE-COUNT 148 0 = OFF, 1 = ON
;
; REMOTE SET ATTRIBUTES OUT ALL 232 0 = OFF, 1 = ON
; REMOTE SET ATTRIBUTES OUT LENGTH 233 0 = OFF, 1 = ON
; REMOTE SET ATTRIBUTES OUT TYPE 234 0 = OFF, 1 = ON
; REMOTE SET ATTRIBUTES OUT DATE 235 0 = OFF, 1 = ON
;X REMOTE SET ATTRIBUTES OUT CREATOR 236 0 = OFF, 1 = ON
;X REMOTE SET ATTRIBUTES OUT ACCOUNT 237 0 = OFF, 1 = ON
;X REMOTE SET ATTRIBUTES OUT AREA 238 0 = OFF, 1 = ON
;X REMOTE SET ATTRIBUTES OUT BLOCK-SIZE 239 0 = OFF, 1 = ON
;X REMOTE SET ATTRIBUTES OUT ACCESS 240 0 = OFF, 1 = ON
;X REMOTE SET ATTRIBUTES OUT ENCODING 241 0 = OFF, 1 = ON
;X REMOTE SET ATTRIBUTES OUT DISPOSITION 242 0 = OFF, 1 = ON
;X REMOTE SET ATTRIBUTES OUT PROTECTION 243 0 = OFF, 1 = ON
;X REMOTE SET ATTRIBUTES OUT GPROTECTION 244 0 = OFF, 1 = ON
;X REMOTE SET ATTRIBUTES OUT SYSTEM-ID 245 0 = OFF, 1 = ON
;X REMOTE SET ATTRIBUTES OUT FORMAT 246 0 = OFF, 1 = ON
;X REMOTE SET ATTRIBUTES OUT SYS-INFO 247 0 = OFF, 1 = ON
;X REMOTE SET ATTRIBUTES OUT BYTE-COUNT 248 0 = OFF, 1 = ON
;
; REMOTE SET FILE TYPE 300 0 = TEXT, 1 = BINARY
;X REMOTE SET FILE NAMES 301 0 = CONVERTED, 1 = LITERAL
; REMOTE SET FILE COLLISION 302 0 = RENAME, 1 = REPLACE,
; X 2 = BACKUP, X 3 = APPEND,
; 4 = DISCARD, X 5 = ASK
;X REMOTE SET FILE REPLACE 303 0 = PRESERVE, 1 = DEFAULT
; REMOTE SET INCOMPLETE 310 0 = DISCARD, 1 = KEEP
;
; REMOTE SET BLOCK-CHECK 400 number (1, 2, or 3)
; REMOTE SET RECEIVE PACKET-LENGTH 401 number (10-9024)
; REMOTE SET RECEIVE TIMEOUT 402 number (any, 0 = no timeout)
; REMOTE SET RETRY 403 number (any, 0 = no limit)
; REMOTE SET SERVER TIMEOUT 404 number (any, 0 = no timeout)
; REMOTE SET TRANSFER CHARACTER-SET 405 Character Set Designator
; REMOTE SET WINDOW-SLOTS 406 number (1-31)
;
; Items marked with "X" are ignored by this server
; srvset - manage incoming REMOTE SET commands
; decode buffer looks like S<len1><value1><len2><value2>
srvset proc near
mov bufptr,offset decbuf+1 ; received command data, asciiz
call srvswk ; worker to convert first value to ax
jc srvset3 ; c = failure
mov temp,ax ; save first value here
cmp ax,132 ; before known set?
jb srvset3 ; b = yes, bad
mov di,offset sattr ; assume SET ATTRIBUTES
cmp ax,148 ; still in range?
jbe srvset2 ; be = yes
cmp ax,232 ; before next range?
jb srvset1 ; b = yes
cmp ax,248 ; still in range?
jbe srvset2 ; be = yes, get final value
srvset1:push es ; do table lookup on other values
push ds
pop es
mov di,offset setval ; look up other codes in table
mov cx,setvlen
cld
repne scasw
pop es
mov bx,offset remms1 ; "Unknown server command", if needed
jne srvset3 ; ne = no match, unknown command
sub di,offset setval+2 ; get displacement
mov di,setvec[di]
srvset2:call di ; call the action routine
mov bx,offset remms6 ; "Command failed", if needed
jc srvset3 ; c = failure
mov si,offset remms8 ; "Command succeeded"
mov di,offset encbuf ; destination for message
call strcpy ; move the message
mov dx,di
call strlen ; length to cx
mov si,offset rpacket ; use this packet for reply
call doenc ; encode
mov trans.chklen,1 ; reply with 1 char checksum
call ackpak ; send ACK with message
clc
ret
srvset3:mov trans.chklen,1 ; reply with 1 char checksum
call errpack ; send error message in ptr bx
clc
ret
srvset endp
sattr proc near ; SET ATTRIBUTES IN/OUT ITEM ON/OFF
mov ax,temp ; get kind of attribute
cmp ax,200 ; the OUT kind?
jb sattr1 ; b = no, IN kind
sub ax,100 ; merge to same thing
sattr1: cmp ax,132 ; ALL?
jne sattr2 ; be = ok
mov bl,0ffh ; all bits
jmp short sattr6
sattr2: cmp al,133 ; Length?
jne sattr3 ; ne = no
mov bl,attlen
jmp short sattr6
sattr3: cmp al,134 ; Type
jne sattr4 ; ne = no
mov bl,atttype
jmp short sattr6
sattr4: cmp bl,135 ; Date?
jne sattr5 ; ne = no, fail
mov bl,attdate
jmp short sattr6
sattr5: stc ; fail
ret
sattr6: call srvswk ; get second value to ax, 1 = on
jc sattr5 ; c = failure
or ax,ax ; off?
jnz sattr7 ; nz = no, on
mov al,flags.attflg ; current flags
not bl ; invert selected items
and al,bl ; turn off selected items
mov flags.attflg,al ; store the flags
clc
ret
sattr7: cmp ax,1 ; on?
jne sattr5 ; ne = no, fail
or flags.attflg,bl ; insert ON selected bits
clc
ret
sattr endp
sftype proc near ; SET FILE TYPE
call srvswk ; get second value to ax
jc sftypb ; c = failure
cmp al,1
ja sftypb ; a = bad
mov trans.xtype,al ; store transfer type
mov dtrans.xtype,al ; store transfer type
clc
ret
sftypb: stc ; bad command
ret
sftype endp
sfcoll proc near ; SET FILE COLLISION
call srvswk ; get second value to ax
jc sfcollb ; c = failure
cmp ax,4
ja sfcollb ; a = bad
cmp ax,2 ; backup?
je sfcollb ; e = yes, bad command
cmp ax,3 ; append?
je sfcollb ; e = yes, bad command
mov flags.flwflg,al ; set file collison state
clc
ret
sfcollb:stc ; bad command
ret
sfcoll endp
sfinc proc near ; SET INCOMPLETE, SET FILE INCOMPLETE
call srvswk ; get second value to ax
jc sfincb ; c = failure
cmp ax,1
ja sfincb ; a = bad
mov flags.abfflg,al ; discard incomplete files if al = 1
clc
ret
sfincb: stc ; bad command
ret
sfinc endp
srtmo proc near ; SET RECEIVE TIMEOUT
call srvswk ; get second value to ax
jnc srtmo1 ; nc = success
ret
srtmo1: cmp ax,94 ; above limit?
jbe srtmo2 ; be = no
mov al,94
srtmo2: mov trans.rtime,al
clc
ret
srtmo endp
sblkck proc near ; SET BLOCK-CHECK
call srvswk ; get second value to ax
jnc sblkck1 ; nc = success
ret ; fail
sblkck1:cmp ax,3 ; our limit
jbe sblkck2 ; be = safe
mov ax,3 ; set to max
sblkck2:or ax,ax ; too small?
jnz sblkck3 ; z = no
inc ax
sblkck3:mov dtrans.chklen,al ; use this char as initial checksum
clc
ret
sblkck endp
srpkt proc near ; SET RECEIVE PACKET-LENGTH
call srvswk ; get second value to ax
jnc srpkt1 ; nc = success
ret
srpkt1: cmp ax,9024 ; above limit?
jbe srpkt2 ; be = no
mov ax,9024
srpkt2: cmp ax,20 ; too small?
jae srpkt3 ; ae = no
mov ax,20 ; set minimum
srpkt3: mov dtrans.rlong,ax ; set long packet size
mov bl,dtrans.rpsiz ; regular packet size
xor bh,bh
cmp ax,bx ; is long packet shorter
jae srpkt4 ; ae = no
mov dtrans.rpsiz,al ; set regular pkt length too
srpkt4: clc
ret
srpkt endp
sretry proc near ; REMOTE SET RETRY
call srvswk ; get second value to ax
jnc sretry1 ; nc = success
ret ; fail
sretry1:cmp ax,63 ; our limit
jbe sretry2 ; be = safe
mov ax,63 ; set to max
sretry2:mov maxtry,al ; set packet retry limit
clc
ret
sretry endp
sstmo proc near ; SET SERVER TIMEOUT
call srvswk ; get second value to ax
jnc sstmo1 ; nc = success
ret
sstmo1: cmp ax,255
jbe sstmo2 ; be = in range
mov al,255 ; limit to max
sstmo2: mov srvtmo,al ; store timeout value
clc
ret
sstmo endp
sxfrch proc near ; SET TRANSFER CHARACTER-SET string
mov bx,bufptr
xor ch,ch
mov cl,[bx] ; byte count of next field, if any
sub cl,' ' ; remove ascii bias
jnc sxfrch1 ; nc = is ok
ret
sxfrch1:inc bx ; look at character string
cmp byte ptr[bx],'A' ; A for Transparent?
jne sxfrch2
cmp cx,1 ; just that char?
jne sxfrchb ; ne = no, fail
mov trans.xchset,0 ; set transfer char set to Transparent
clc
ret
sxfrch2:cmp cx,6 ; "I2/100"?
jne sxfrchb ; ne = no, fail
cmp word ptr [bx],'2I' ; length is ok, check spelling
jne sxfrchb ; ne = failure
cmp word ptr [bx+2],'1/'
jne sxfrchb
cmp word ptr [bx+4],'00'
jne sxfrchb
mov trans.xchset,1 ; set transfer char set to Latin1
clc
ret
sxfrchb:stc ; fail
ret
sxfrch endp
swind proc near ; SET WINDOW-SLOTS
call srvswk ; get second value to ax
jnc swind1 ; nc = success
ret
swind1: cmp ax,31 ; max legal
jbe swind2 ; be = in range
mov al,31 ; limit to max
swind2: or ax,ax ; no windowing?
jnz swind3 ; nz = no, not that way
mov ax,1 ; local min size for no windowing
swind3: mov dtrans.windo,al ; store default window size
clc
ret
swind endp
; Worker for srvset. Reads buffer pointed at by bufptr looking for
; construction <length><numbers>. Returns carry clear and binary number
; in AX, else carry set and AX = -1. Bufptr is always updated.
srvswk proc near
push bx
push cx
push dx
push si
mov bx,bufptr
xor ch,ch
mov cl,[bx] ; byte count of next field, if any
sub cl,' ' ; remove ascii bias
jnc srvswk1 ; nc = is ok
mov ax,-1 ; else say value is -1
jmp short srvswkx
srvswk1:inc bx
xor si,si ; accumulated value
mov dl,10
srvswk2:mov ax,si ; accumulated value
mul dl ; times 10
mov si,ax ; store
xor ah,ah
mov al,[bx] ; get a digit
inc bx
sub al,'0' ; remove ascii bias
jnc srvswk3 ; nc = no
mov ax,-1 ; say bad value
jmp short srvswkx ; and quit
srvswk3:add si,ax ; accumulate new digit
loop srvswk2 ; do all digits
mov ax,si ; return results in ax
clc
srvswkx:mov bufptr,bx ; remember where we read from decbuf
pop si
pop dx
pop cx
pop bx
ret
srvswk endp
; srvini - init parms based on 'I' init packet
srvini proc near
call spar ; parse info
call packlen
mov cx,trans.rlong ; max receiving pkt length to report
call makebuf ; remake buffers for new windowing
push si
mov si,offset rpacket
call rpar ; setup info about our reception
pop si
mov al,trans.chklen ; checksum length negotiated
push ax ; save around reply
mov trans.chklen,1 ; reply with 1 char checksum
call ackpak
pop ax ; restore checksum length
mov dtrans.chklen,al ; to negotiation value
clc ; success
ret
srvini endp
; BYE command - tell remote KERSRV to logout & exit to DOS
BYE PROC NEAR
mov ah,cmeol ; get a confirm
call comnd
jnc bye1 ; nc = success
ret ; failure
bye1: mov remcmd,'L' ; Logout command letter
call logo ; tell the host Kermit to logout
jc bye2 ; c = failed, do not exit
;;; mov flags.extflg,1 ; set this Kermit's exit flag
call serhng ; hangup the phone
bye2: clc
ret
BYE ENDP
; FINISH - tell remote KERSRV to exit
FINISH PROC NEAR
mov ah,cmeol ; get a confirm
call comnd
jnc finish1 ; nc = success
ret ; failure
finish1:mov remcmd,'F' ; Finish command letter
call logo
clc
ret
FINISH ENDP
; Common routine for BYE, FINISH, REMOTE LOGOUT. Avoids sending I packet.
; Return carry clear for success, else carry set
LOGO PROC NEAR
call serini ; Initialize port
jnc logo1 ; nc = success
ret ; c = failure
logo1: call clrbuf ; clear serial port buffer
call ihostr ; initialize the host
mov trans.windo,1 ; one window slot before negotiations
mov cx,dspsiz ; default send pkt length (94)
call makebuf ; set up packet buffers
xor ax,ax
mov diskio.string,al ; clear local filename for stats
mov pktnum,al ; packet number to be used
mov windlow,al ; reset windowing
call packlen ; get max packet length
call getbuf ; get buffer for sending
mov trans.chklen,1 ; use one char for server functions
mov ah,remcmd ; get command letter ('L' or 'F')
mov encbuf,ah ; encode the command
mov cx,1 ; one piece of data
call doenc ; do encoding
mov [si].pktype,'G' ; Generic command packet type
mov flags.xflg,1 ; say receiving to screen
call sndpak ; to suppress # pkts msg
jc logo3 ; c = failure
mov al,[si].seqnum ; get response for this sequence num
mov ah,maxtry ; retry threshold
call response ; get response
pushf
mov si,offset rpacket ; packet to look at
cmp [si].pktype,'E' ; Error packet?
je logo2 ; e = yes, contents displayed already
call msgmsg ; show any message
logo2: popf
logo3: mov flags.cxzflg,0 ; clear these flags
mov flags.xflg,0
ret ; exit with carry flag from response
LOGO ENDP
; GET command. Ask remote server to send the specified file(s)
; Queries for remote filename and optional local override path/filename
GET PROC NEAR
mov auxfile,0 ; clear, for safety
mov encbuf,0 ; ditto
mov flags.cxzflg,0 ; no Control-C typed yet
mov bx,offset encbuf ; where to put text
mov dx,offset filmsg ; help
mov ah,cmline ; filenames with embedded whitespace
call comnd ; get text or confirm
jnc get1 ; nc = success
ret ; failure
get1: mov cnt,ax ; remember number of chars we read
or ax,ax ; read in any chars?
jnz get7 ; nz = yes, analyze
; if empty line, ask for file names
get2: mov dx,offset remfnm ; ask for remote name first
call prompt
mov bx,offset encbuf ; place for remote filename
mov dx,offset frem ; help message
mov ah,cmline ; use this for embedded spaces
call comnd ; get a filename
jnc get3 ; nc = success
ret ; failure
get3: mov cnt,ax ; remember number of chars read
or ax,ax ; count of entered chars
jz get2 ; z = none, try again
mov dx,offset lclfnm ; prompt for local filename
call prompt
mov bx,offset filhlp
mov dx,offset auxfile ; complete local filename
mov auxfile,0 ; clear, for safety
mov ah,cmword ; get a word
call comnd
jnc get5 ; nc = success
ret ; failure
get5: mov ah,cmeol ; get confirmation
call comnd
jnc get6 ; nc = success
ret ; failure
get6: cmp auxfile,'#' ; is first char a replacement for '?'
jne get7 ; ne = no
mov auxfile,'?' ; replace '#' by '?'
get7: cmp encbuf,'#' ; is first char a replacement for '?' ?
jne get8 ; ne = no
mov encbuf,'?' ; replace '#' by '?'
get8: call rrinit ; get & clear buffers and counters
mov flags.xflg,1 ; assume writing to screen
cmp flags.destflg,2 ; receiving to screen?
je get8a ; e = yes, skip screen stuff
mov flags.xflg,0 ; not writing to screen, yet
call init ; init (formatted) screen
get8a: mov kstatus,kssuc ; global status, success
call ipack ; Send Initialize, 'I', packet
jnc get8b ; nc = success, ok to fail 'I' pkt
jmp short get10 ; failure
get8b: mov si,offset encbuf ; copy from here
mov di,offset fsta.xname ; to statistics remote name field
call strcpy
mov si,offset rpacket ; packet for response
mov cx,cnt ; get back remote filename size
call doenc ; encode data already in encbuf
jnc get9 ; nc = success
mov dx,offset ermes6 ; filename is too long for pkt
call ermsg
mov bx,dx ; point to message, for errpack
call errpack ; tell the host we are quiting
jmp short get10 ; data could not all fit into packet
get9: mov trans.chklen,1 ; use one char for server functions
mov rpacket.pktype,'R' ; Receive init packet
mov si,offset rpacket
call sndpak ; send the packet, no ACK expected
jc get10 ; c = failure to send packet
mov rstate,'R' ; Set the state to receive initiate
jmp READ2 ; go join read code
get10: call bufclr ; total failures come here
call rprpos ; reset cursor for prompt
or errlev,ksrecv ; set DOS error level to cannot rcv
or fsta.xstatus,ksrecv ; set status
mov kstatus,ksrecv ; global status
mov flags.cxzflg,0 ; clear flag for next command
mov auxfile,0 ; clear send-as filename buffer
mov flags.xflg,0 ; clear to-screen flag
mov al,1 ; underline cursor
call fcsrtype ; set IBM-PC cursor to underline
clc
ret
GET ENDP
; This is the REMOTE command
REMOTE PROC NEAR
mov dx,offset remtab ; Parse keyword from the REMOTE table
mov bx,offset remhlp
mov ah,cmkey
call comnd
jnc remote1 ; nc = success
ret ; failure
remote1:jmp bx ; do the appropriate routine
REMOTE ENDP
; REMSET - Execute a REMOTE SET command
REMSET PROC NEAR
mov rempac,'G' ; Packet type = generic
mov encbuf,'S' ; command type = Set
mov bufptr,offset encbuf+1 ; place more pkt material here
mov ah,cmkey ; get keyword
mov dx,offset remstt1 ; table of keywords
xor bx,bx ; help
call comnd
jnc remset1 ; nc = success
ret
remset1:cmp bx,1 ; Attributes?
jne remset5 ; ne = no
mov dx,offset remsat1 ; Attributes IN, OUT table
xor bx,bx ; help
mov ah,cmkey
call comnd
jnc remset2
ret
remset2:mov temp,bx ; save in out
mov dx,offset remsat2 ; next attributes keyword table
xor bx,bx ; help
mov ah,cmkey
call comnd
jnc remset3
ret
remset3:add bx,temp ; save final value
call remwork
mov dx,offset onoff ; ON, OFF table
xor bx,bx ; help
mov ah,cmkey ; get on,off
call comnd
jnc remset4
ret
remset4:jmp remset17
remset5:cmp bx,2 ; REMOTE SET FILE?
jne remset14 ; ne = no
mov dx,offset remsfit ; REM SET FILE table
xor bx,bx ; help
mov ah,cmkey
call comnd
jnc remset6
ret
remset6:push bx
call remwork ; write kind to buffer
pop bx
cmp bx,300 ; TYPE?
jne remset8
mov dx,offset remsfty ; TYPE table
xor bx,bx
mov ah,cmkey
call comnd
jnc remset17
ret
remset8:cmp bx,301 ; NAME?
jne remset10 ; ne = no
mov dx,offset remsfna ; NAME table
xor bx,bx
mov ah,cmkey
call comnd
jnc remset17
ret
remset10:cmp bx,302 ; COLLISION?
jne remset12 ; ne = no
mov dx,offset remsfco ; COLLISION table
xor bx,bx
mov ah,cmkey
call comnd
jnc remset17
ret
remset12:cmp bx,303 ; REPLACE?
jne remset13 ; ne = no
mov dx,offset remsfre ; REPLACE table
xor bx,bx
mov ah,cmkey
call comnd
jnc remset17
ret
remset13:cmp bx,310 ; INCOMPLETE?
jne remset13a ; ne = no
mov dx,offset remsfin ; INCOMPLETE table
xor bx,bx
mov ah,cmkey
call comnd
jnc remset17
remset13a:stc
ret
remset14:cmp bx,310 ; REMOTE SET INCOMPLETE?
jne remset15 ; ne = no
push bx
call remwork ; write main command
pop bx
jmp short remset13 ; use above to complete the command
remset15:cmp bx,3 ; REMOTE SET RECEIVE?
jne remset18 ; ne = no
mov dx,offset remsrcv ; RECEIVE table
xor bx,bx
mov ah,cmkey
call comnd
jnc remset19 ; get value as text
remset16:stc
ret
remset17:call remwork ; write to buffer
jmp short remset22
; text as last item commands
remset18:mov temp,bx
cmp bx,405 ; Transfer?
jne remset19 ; ne = no
mov dx,offset remsxfr ; TRANSFER table
xor bx,bx
mov ah,cmkey
call comnd
jnc remset19
ret
remset19:call remwork ; store command type
mov dx,bufptr ; store response as text
inc dx ; skip count byte
mov bx,offset numhlp
cmp temp,405 ; Transfer character set needs string
jne remset20 ; ne = not string
mov bx,offset xfrhlp ; use this help
remset20:mov ah,cmword
call comnd
jnc remset21
ret
remset21:mov dx,bufptr ; field pointer
inc dx ; look at text
call strlen ; length to cx
add cx,' ' ; compute byte count field
mov bx,bufptr
mov [bx],cl ; store byte count
remset22:mov ah,cmeol ; get a confirmation
call comnd
jnc remset23
ret
remset23:mov dx,offset encbuf
call strlen ; get length
mov cnt,cx ; length for generic
mov flags.xflg,1 ; response coming to screen
jmp genr9 ; do the operation
REMSET ENDP
; Remote Set worker. Enter with new numerical value in BX. Writes length
; and asciiz value to encbuf and increments buffer pointer bufptr.
remwork proc near
mov di,offset tmpbuf ; temp buffer
mov byte ptr [di],0 ; clear it
mov ax,bx
call dec2di ; convert value to asciiz
mov dx,offset tmpbuf ; get length to cx
mov si,dx ; asciiz data source
call strlen
push cx ; save length
mov di,bufptr ; byte count field
add cl,' ' ; to ascii
mov [di],cl ; store count byte
inc di
pop cx
push es
push ds
pop es
cld
rep movsb ; copy asciiz data value
pop es
mov byte ptr [di],0 ; insert null terminator
mov bufptr,di
ret
remwork endp
; In REM commands below, al = remcmd, ah = rempac, cl = remlen
; REMCWD - Change remote working directory
REMCWD PROC NEAR
mov ax,'GC' ; Packet type = generic
xor cl,cl ; no text required
jmp genric
REMCWD ENDP
; REMDEL - Delete a remote file
REMDEL PROC NEAR
mov ax,'GE' ; Packet type = generic
mov cl,1 ; text required
jmp genric
REMDEL ENDP
; REMDIR - Do a directory
REMDIR PROC NEAR
mov ax,'GD' ; Packet type = generic
xor cl,cl ; no text required
jmp genric
REMDIR ENDP
; REMDIS - Get disk usage on remote system
REMDIS PROC NEAR
mov ax,'GU' ; Packet type = generic, disk usage
xor cl,cl ; optional text permitted
jmp genric ; Execute generic Kermit command
REMDIS ENDP
; REMHEL - Get help about remote commands
REMHEL PROC NEAR
mov ax,'GH' ; Packet type = generic, Help
xor cl,cl ; no text required
jmp genric ; Execute generic Kermit command
REMHEL ENDP
; REMHOS - Execute a remote host command
REMHOS PROC NEAR
mov ax,'C ' ; Packet type = remote command
mov cl,1 ; text required
jmp genric
REMHOS ENDP
; REMKER - Execute a remote Kermit command
REMKER PROC NEAR
mov ax,'K ' ; Packet type = remote Kermit command
mov cl,1 ; text required
jmp short genric
REMKER ENDP
; REMLOGIN - LOGIN [username [password [account]]]
REMLOGIN PROC NEAR
mov ax,'GI' ; Packet type = generic
xor cl,cl ; no text required
jmp short genric
REMLOGIN ENDP
; REMOTE LOGOUT - Logout of remote server and host, stay in this Kermit
REMLOGOUT PROC NEAR
mov remcmd,'L' ; Logout command letter
call logo ; perform without I packet
clc
ret
REMLOGOUT ENDP
; REMMSG - Send one line short message to remote screen.
REMMSG proc near
mov ax,'GM'
mov cl,1 ; text required
jmp short genric
REMMSG endp
; REMTYP - Type a remote file
REMTYP PROC NEAR
mov ax,'GT' ; Packet type = generic, Type file
mov cl,1 ; text required
jmp short genric
REMTYP ENDP
; REMWHO - ask for list of remote logged on users
REMWHO proc near
mov ax,'GW'
xor cl,cl ; optional text permitted
jmp short genric
REMWHO endp
; GENRIC - Send a generic command to a remote Kermit server
; remlen = 0: no additional text, or additional text is optional
; remlen = 1: additional text is required
GENRIC PROC NEAR
mov remcmd,al ; stash cmd info in real memory
mov rempac,ah ; packet type
mov remlen,cl ; text required flag
mov si,offset infms3 ; dummy filename for transaction log
mov di,offset diskio.string ; where such names go
call strcpy ; move the name
mov bx,offset encbuf ; where to put text
mov temp,bx ; where field starts
cmp rempac,'C' ; Remote Host command?
je genr2 ; e = yes, no counted string(s)
cmp rempac,'K' ; Remote Kermit command?
je genr2 ; e = yes, no counted string(s)
genr1: mov ah,remcmd ; get command letter
mov [bx],ah ; store in buffer
add bx,2 ; leave room for count byte
mov temp,bx ; point at data field
genr2: mov ah,cmline ; get a line text
mov dx,offset genmsg ; help message
call comnd
jnc genr3 ; nc = success
ret ; failure
genr3: mov cnt,ax ; size
call genredir ; act on any ">filespec" redirection
add temp,ax ; point to next field
cmp rempac,'C' ; Remote Host command?
je genr4 ; e = yes, no counted string(s)
cmp rempac,'K' ; Remote Kermit command?
je genr4 ; e = yes, no counted string(s)
mov encbuf+1,al ; size of first field
add encbuf+1,32 ; do tochar function
inc temp ; include count byte
genr4: cmp al,remlen ; got necessary command text?
jae genr5 ; ae = yes
cmp remlen,0 ; is text optional?
je genr5 ; e = yes, continue without it
genr4a: mov dx,offset infms2 ; say need more info
mov ah,prstr
int dos
or errlev,ksgen ; say cannot receive
or fsta.xstatus,ksgen ; set status failed
mov kstatus,ksgen ; global status
clc
ret
genr5: mov flags.xflg,1 ; output coming to screen
cmp remcmd,'I' ; Remote Login command?
je genr6 ; e = yes
cmp remcmd,'C' ; Remote Change Working Directory?
je genr7a ; e = yes, get optional password
jmp short genr8 ; neither so no extra prompts here
genr6: cmp cnt,0 ; have username etc already?
je genr6a ; e = no
call genupwd ; parse username etc
jmp short genr8 ; send formatted contents
genr6a: mov dx,offset user ; prompt for username
call prompt
mov bx,offset encbuf+1 ; skip command letter
mov temp,bx ; start of field
call input ; read text
jc genr8 ; c = none
mov temp,bx ; point to next data field
genr7: mov dx,offset password ; get optional password
call prompt
genr7a: mov bx,temp ; where to put the password
cmp byte ptr [bx-1],0 ; extra null?
jne genr7b ; ne = no
dec bx ; backup to overwrite it
dec temp
genr7b: mov comand.cmquiet,1 ; turn on quiet mode
call input ; read in the password
mov comand.cmquiet,0 ; turn off quiet mode
jc genr8 ; c = no text, do not add field
mov temp,bx ; point to next data field
;
cmp remcmd,'I' ; Remote Login command?
jne genr8 ; ne = no
mov dx,offset account ; get optional account ident
call prompt
mov bx,temp ; where this field starts
call input ; read text
genr8: cmp flags.cxzflg,'C' ; Control-C entered?
jne genr9 ; ne = no
stc
ret ; return failure
GENR9: mov kstatus,kssuc ; global status
call ipack ; Send Init parameters
jc genr11 ; c = failure
mov trans.chklen,1 ; use 1 char for server functions
mov fsta.pretry,0 ; no retries yet
mov pktnum,0
cmp flags.cxzflg,'C' ; did the user type a ^C?
jne genr10 ; ne = no
stc
ret ; return in error state
genr10: push si
mov si,offset rpacket ; use this packet for reply
mov dx,offset encbuf
call strlen ; length of data
call doenc ; encode data
mov trans.chklen,1 ; use block check 1 to server
mov ah,rempac ; packet type
mov rpacket.pktype,ah
call sndpak ; send the Generic command packet
pop si
jc genr11 ; c = failure
mov rstate,'R' ; next state is Receive Initiate
jmp READ2 ; file receiver does the rest
genr11: mov flags.xflg,0 ; reset screen output flag
xor ax,ax ; tell statistics this was a read
or errlev,ksrem ; DOS error level, failure of REMote cmd
mov fsta.xstatus,ksrem ; set status
mov kstatus,ksrem ; global status
clc
ret
GENRIC ENDP
; Extract ">filespec" redirection at end of command line. If found put
; filespec in auxfile as new output name.
genredir proc near
mov cx,cnt ; chars on command line
jcxz genred3 ; z = none
mov di,temp ; buffer, after prologue
add di,cx ; end of buffer+1
dec di
push ax
push es
mov ax,ds
mov es,ax
mov al,'>' ; redirection symbol
std ; scan backward
repne scasb ; found '>'?
cld
pop es
pop ax
jne genred3 ; ne = no
inc di ; look at '>'
mov byte ptr[di],0 ; insert terminator
mov ax,cx ; new count length
mov cnt,cx ; remember here too
genred1:inc di ; look at optional filename
or di,di ; terminator?
jz genred2 ; z = yes
cmp byte ptr [di],' ' ; remove lead-in puncutation
jbe genred1 ; be = punctuation, go until text
genred2:mov si,di
mov di,offset auxfile ; new output name goes here
call strcpy
genred3:ret
genredir endp
; Parse a single command line into username, password, account in counted
; string style, for REM LOGIN. Enter with BX pointing at the next new
; byte to store a command character and CNT holding the current line length.
; Returns a completely formatted line, asciiz. Use {..} to surround items
; with embedded spaces.
genupwd proc near
push ax
push bx
push es
mov ax,ds
mov es,ax
sub bx,cnt ; next item minus count of items
mov si,bx ; where text starts
dec bx ; point at count byte
mov cx,3 ; three fields possible
genupw1:push cx
mov cx,cnt ; number of text chars to examine
call genup10 ; get first field
mov cnt,cx ; update remaining count
or cx,cx ; get remaining count
pop cx ; recover loop counter
jz genupw2 ; z means empty remainder
loop genupw1 ; try to do three fields
genupw2:pop es
pop bx
pop ax
ret
; Worker. Enter with bx=offset of count byte, si=offset of start of text,
; cx=chars remaining in input string.
; Exit with bx=offset of next count byte, si=offset of where new text is
; to be read, cx=chars remaining in input string.
genup10:mov byte ptr [bx],' ' ; clear count byte to zero + space
mov di,si ; work on text part
mov al,' ' ; skip whitespace
cld
repe scasb
je genup12 ; e = nothing present
dec di ; back up to non-white char
inc cx ; correct count
mov si,di ; si = where non-white text starts
mov di,bx ; count byte
inc di ; where text goes
mov ah,' ' ; assume this is the break char
cmp byte ptr [si],'{' ; field starts with brace?
jne genup11 ; ne = no
mov ah,'}' ; use this break char
inc si ; skip over leading brace
dec cx ; one less char to consider
genup11:lodsb ; get a char
cmp al,ah ; break char yet?
je genup12 ; e = yes
or al,al ; end of text?
jz genup12 ; z = yes
stosb ; store char without leading padding
inc byte ptr [bx] ; count chars stored in this field
loop genup11 ; continue
genup12:mov bx,di ; where to store next count byte
mov byte ptr [di],0 ; null terminator
ret
genupwd endp
; Send "I" packet with transmission parameters
IPACK PROC NEAR
call serini ; initialize serial port
jnc ipack1
ret ; c = failure
ipack1: call ihostr ; initialize the host
call clrbuf ; clear serial port buffer
call sparmax ; set up our maximum capabilites
mov trans.windo,1 ; no windows yet
mov cx,dspsiz ; default send pkt length (94)
call makebuf ; remake buffers
xor ax,ax
mov rpacket.numtry,al ; number of receive retries
mov fsta.pretry,ax ; no retries
mov pktnum,al ; packet number 0
mov windlow,al ; reset windowing
call packlen ; compute packet length
call getbuf ; get buffer for sending
call rpar ; store them in the packet
mov trans.chklen,1 ; one char for server function
mov [si].pktype,'I' ; "I" packet
call sndpak ; send the packet
jnc ipack2 ; nc = success
ret ; return failure
ipack2: mov al,[si].seqnum
mov ah,maxtry ; retry threshold
add ah,ah
add ah,maxtry ; triple the normal retries
mov chkparflg,1 ; check for unexpected parity
call response ; get response
jnc ipack3 ; nc = success
call bufclr ; clear all
cmp rpacket.pktype,'E' ; was it an Error pkt response?
je ipack4 ; e = yes, this is forgivable
stc ; carry set for failure
ret ; return failure
ipack3: cmp rpacket.pktype,'Y' ; ACK response?
jne ipack4 ; ne = no
push si
mov si,offset rpacket ; packet address
call spar ; read in the data
pop si
call packlen ; get max send packet size
mov cx,trans.rlong ; max receiving pkt length to report
call makebuf ; remake buffers for new windowing
ipack4: cmp rpacket.pktype,'E' ; was it an Error pkt response?
jne ipack5 ; ne = no
mov dx,offset emptymsg ; clear last error line
call ermsg ; do it
ipack5: clc
ret ; return success
IPACK ENDP
; Returns BX the updated pointer to the input buffer
; input buffer = <ascii data length count byte>textstring
; return carry clear if have text, else carry set for none
INPUT PROC NEAR
mov temp2,bx ; where to put byte count
inc bx ; start text after count byte
xor dx,dx ; help, none
mov ah,cmline ; get text with embedded whitespace
call comnd
jnc input1 ; nc = success
mov bx,temp2 ; empty field, restore pointer
ret ; failure
input1: push bx
mov bx,temp2
add al,' ' ; convert byte count to ascii
mov [bx],al ; store count byte
pop bx ; return pointer to next free byte
clc ; say have bytes
ret
INPUT ENDP
code ends
end
