Filtrarisma tou Peer2Peer ???

[Evangelos Tsontsis]

Andreas Chalkias wrote:

>Καλησπέρα σε όλους!!
>
>Έχω μια απορία... Γνωρίζεται πως μπορεί κανείς να φιλτράρει τα Peer2Peer (p2p) 
>προγράμματα διαμέσου ενός content filter προγράμματος όπως το DansGuardian, 
>ώστε αναζητήσεις για απαγορευμένο υλικό να μην επιστρέφει αποτελέσματα??
>
>Ευχαριστώ εκ των προτέρων,
>
>Ανδρέας
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Poly dyskolo na ginei kati tetoio....To DansGuardian flitrarei HTTP
kodika pou einai standardized kai universal. H katastasi me ta diafora
p2p einai diaforetiki. Diaforetiko protocolo gia ka8e ena apo ta
diaforetika diktia p2p. 8eoritika an kapoios 8a i8ele na ftiaksei ena
tetoio filter programa ayto 8a eprepe na kanei ta eksis:
1. na kanei capture to traffic tis p2p application, kai decoding ta
paketa (san to ethereal)
2. se real time na anagnorizei to 'SEARCH' request (i to antistixo
message tou ka8e p2p protocolou)
3. Na diavazei to payload tou 'SEARCH'
4. Na sygkrinei to payload me mia lista apo apagoreymenes lekseis pou
esy o admin 8a orizeis....
5. Na min afinei to 'Search" message na pernaei an exeis match

Kai mono gia to parapano 8eleis arketo processing mia pou:
1. to traffic pou kanei generate ena p2p application einai terastio
(idios se sygkrisi me HTTP)
2. Ti akribos filtra 8a baleis???? ante na skefteis ti pi8ana onomata 8a
exoun ta arxeia pou 8a skeftei na katevasei ka8e xristis kai 8a psaksei
gia ayta
3. ka8os ta protocola allazoun (i bgainoun kainouria p2p) 8a prepei na
grapseis kodika pou na anagnorizei to kainourio protocol stin piatsa

Alla katse akoma de teleiosame.....
to emule (kai alla) mporoun na apofygoun entelos to 'SEARCH' packet. An
o user px brei ena file pou ton endiaferei se kapoio forum kai kanei
'copy-paste' to EDONKEY link sto direct download, tote to emule den
stelnei 'SEARCH' packet alla "GETSOURCES' packet pou den periexei to
filename alla mono to fileid....Pos 8a mantepsei loipon to programma sou
an to file me to sygkekrimeno fileid einai to "xxx-girlswithHorses" i to
"mikrigorgona.avi" ???
8eoritika ginete kai ayto an to programma sou ektos apo filter einai
taytoxrona kai ena megaclient gia OLA ta p2p programata opote:
1. Kanei capture to GETSOURCES message
2.to krataei sto cache kai....
3. stelnei to idio 'GETSOURCES' me to sygkekrimeno fileid
4. Apo ta result kanei extract to filename tou arxeiou.
5. Apply ta filter sou sto filename
6. An perasei ta filtra tote afise to 'GETSOURCES' pou exeis sto cache
na perasei---allios kanto discard
7. Kane ta parapano gia ka8e 'GETSOURCES' mesage pou pernaei...ta opoia
einai polla giati periodika to emule ta stelnei kai ta ksanastelnei
stous servers gia na brei kanourious peers pou exoun to arxeio


Akoma epimeneis? :)

Filika,
Evangelos Tsontsis