Re^4: Help with LAN

[Mixalis Kabrianis]

A. Xairomai pou meionontai ta simeia tribis. H simfonoume siga siga, i
barethikes na mou exigeis ayta pou den mporo na katalabo :-(

> >> moy kapnisei. Den exw to dikaiwma na xrhsimopoihsw THN YLOPOIHSH
> >> TOY PRWTOKOLLOY AYTOY POY ANHKEI STH MICROSOFT. An ftiaksw mia 
> >> dikh moy ylopoihsh TOY IDIOY AKRIBWS PRWTOKOLLOY xwris na 
> >> xrhsimopoihsw eswterikes plhrofories ths
> >> Micro$oft, kaneis de mporei na moy pei apolytws tipota.
>
> L> Diladi to protokolo (opos perigrafetai, pou kapou tha
> L> perigrafetai) iparxei eleythera diathesimo? 
>
>Oxi, h Microsoft exei kai ta dikaiwmata toy documentation. 
>
>Alla apo th stigmh poy DEN exei PATENT sto prwtokollo alla aplws COPYRIGHT, 
>shmainei oti ean kapoios, me opoiadhpote dhmosiws dia8esima mesa,
kataferei na
>kanei mia ylopoihsh toy idioy prwtokolloy, ayto fysika kai den desmeyetai apo
>ta dikaiwmata ths Microsoft. 
>
>Sthn periptwsh twn patents, ta pragmata einai diaforetika. MPOREIS na bgaleis
>mia patenta poy na kalyptei perioristika ena prwtokollo, kai na dinei mono se
>sena thn dynatothta ekmetalleyshs toy gia ena orismeno xroniko diasthma
(nomizw
>maximum 75 xronia). Se ayth thn periptwsh, AKOMA kai an parallhla anaptykseis
>monos sou to idio prwtokollo, 8ewreitai oti parabiazeis thn patenta. (Ayto
>symbainei logou xarh me ton algori8mo sympieshs LZ77, h me thn RSA
kryptografia
>- an kai h patenta ths teleytaias exei lhksei apo perisy nomizw). Oi patentes
>omws dinontai mono ean mporeseis na apodeikseis oti o algori8mos (h to
>prwtokollo klp klp) poy 8eleis na prostateyseis, einai dikhs soy epinohshs
KAI
>den exei hdh epinoh8ei apo kapoion allon. De mporw na fantastw mia perigrafh
>toy NetBEUI poy na tairiazei mono s'ayto kai oxi kai se kapoio proyparxon
>prwtokollo toy idioy epipedoy....

Ayta einai ligo nomikistika kolpa, den nomizeis? En pasei periptosei, tha
symfoniso mazi sou, giati den exo stoixeia (ara gia na to anafereis tha
exeis esy stoixeia, opote exeis dikio!)

>
> L> perigrafetai se kanena "eleythera diakimoumeno" arxeio (i kati
> L> tetoio) alla prepei na to agoraseis, ayto to arxeio, gia na 
> L> matheis ta specs tou protokolou...
>
>De xreiazetai na to kaneis. Ean mporeseis mesw ekswterikhs kai mono
parathrhshs
>na katalabeis pws leitoyrgei eswterika, eisai kalymmenos. Ayto legetai
reverse
>engineering : Bazeis dyo ylopoihseis toy SMB (dyo mhxanhmata windows p.x.) na
>antallasoyn arxeia, kai parakoloy8eis to ti lene metaksy toys. Ystera
>epanalambaneis to "dialogo" kai peiramatizesai allazontas fields, ktl ktl.
>Exontas kai gnwseis sxediasmoy analogwn systhmatwn, "manteyeis" th domh
kai th
>leitourgia tous. Telika, kataferneis na katanohseis pws leitoyrgei
eswterika h
>ylopoihsh - dhladh poio akribws einai to prwtokollo, se arketo ba8mo wste na
>kaneis mia dikh sou ylopoihsh. 

To reverse engineering, SIGOURA einai paranomo. Alla den einai ayto pou
les. Reverse engineering einai na kaneis disassemble ton kodika. I taktiki
pou les, einai ayti pou akolouthise i Compaq gia na bgalei ton proto
simbato PC. Diladi ebale kapoion na meletisei to ROM-BIOS tou IBM PC, ton
ebale na bgalei odigies (oxi texnikes, alla to ti prepei na kanei) kai
ebale alla atoma pou POTE den eixan dei ROM-BIOS na ftiaxoun to diko tous.

>To samba grafthke kai synexizei na grafetai akribws m'ayto ton tropo. O
Andrew
>Tridgell ekane reverse engineering sto Pathworks ths DEC. To IPX/SPX toy
linux
>epishs grafthke akribws me ayto ton tropo. 
>
>Anti8etws, oi programmatistes poy eftiaksan to LessTiff, to ekanan exontas
hdh
>prosbash sto source code toy Motif kai ara mporoyn na kathgorh8oyn gia
>antigrafh - pragma poy shmainei oti h OSF/1 mporei aneta na toys trabhksei
mia
>mynhsh (ypopteyomai wstoso oti de 8a to kanei) 


Mpa, mallon tha to kanoun otan to Linux kai to Lesstif ftasoun se toso
megales posotites pou na tous dimiourgoun oikonomiki xasoura. Alla ayto
einai allo thema

> L> Ara exomoiosi (tou protokolou kai oxi ton dikaiomaton, opos sosta
> L> episimanes)
>
>Den "ekswmoiwneis" ena prwtokollo. 
>
>To "ylopoieis". Estw kai aneksarthta. 
>
>Aplws mporeis na "ekswmoiwseis" mia sygkekrimenh "ylopoihsh" toy
prwtokolloy. 

Sosta. Opos eipa kai se allo gramma, o enas milaei gia NetBEUI kai o allos
gia NetBIOS. Alla fantazomai oti otan eksomoioneis mia ilopoiisi tou
protokolou, sto bathos eksomoioneis to protokolo. Ektos an pali den
katalaba kala ti ennoeis, i den milame gia to idio pragma.

>NAI. KOLLAW STIS LEKSEIS. Giati oi lekseis exoyn nohma - den yparxoyn
aplws gia
>na trexoyn eytyxismenes sta kataprasina libadia ths Boreias Skwtias...

Sta kataprasina libadia omos tis Kentrikis Elladas? Symfono, arkei gia xari
ton lexeon na mi xaneis to noima :-)

>Ciao,
>  Christos
>--

Bye

        Mixalis Kabrianis
Agricultural University of Athens
  Network Management Center
    mkabrian at auadec.aua.gr
     ICQ (in Linux)	441092

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