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Assembly Source File | 1991-10-24 | 70KB | 2,234 lines

NAME mssser ; File MSSSER.ASM include mssdef.h ; Copyright (C) 1982,1991, Trustees of Columbia University in the ; City of New York. Permission is granted to any individual or ; institution to use, copy, or redistribute this software as long as ; it is not sold for profit and this copyright notice is retained. ; Edit history: ; 6 Sept 1991 version 3.11 ; Last edit 27 Aug 1991 public logout, 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 0C16H ; 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 $-srvch2 srvdsp dw srvcwd,srvdir,srvdel,srvfin,srvhlp,srvlog,srvmsg dw srvset,srvtyp,srvspc,srvwho remhlp db cr,lf,' Command Action performed by the server Kermit' db cr,lf,' ------- -------------------------------------' db cr,lf,' CD/CWD change working directory' ; Answer to db cr,lf,' Delete a file' ; local db cr,lf,' Directory filespec' ; REM HELP db cr,lf,' Help show server''s remote help screen' db cr,lf,' Host command (to remote operating system)' db cr,lf,' Kermit command (to Kermit server)' db cr,lf,' Login name password to a Kermit server' db cr,lf,' Message short one line message' db cr,lf,' Print local file (on server''s printer)' db cr,lf,' Set command (modify server)' db cr,lf,' Space drive/directory' db cr,lf,' Type a file on this screen' db cr,lf,' Who user parameters$' ; 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,'FINISH, LOGOUT, BYE ' 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 14 ; 14 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 '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 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 begtim:near, 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 mov dx,scrser ; move cursor near top of screen call poscur 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 call makebuf ; remake all buffers for new windowing call packlen ; determine max packet length 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 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,maxpack ; above limit? jbe srpkt2 ; be = no mov ax,maxpack 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 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 ; LOGOUT - tell remote KERSRV to logout LOGOUT PROC NEAR mov ah,cmeol call comnd ; get a confirm jnc logout1 ; nc = success ret ; failure logout1:mov remcmd,'L' ; Logout command letter call logo clc ret LOGOUT ENDP ; Common routine for FINISH, LOGOUT, BYE ; 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 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 ; 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: call begtim ; start statistics mov kstatus,kssuc ; global status, success call makebuf ; setup packet buffers 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 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 ; 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 clrbuf ; clear serial port buffer call ihostr ; initialize the host call sparmax ; set up our maximum capabilites mov trans.windo,1 ; no windows yet 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 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