P2P?subversion?????%20???????????%20(??????:AirFolder) - PowerPoint PPT Presentation

Title: P2P?subversion?????%20???????????%20(??????:AirFolder)


1
P2P?subversion????????????????(??????AirFolder)

• ?????
• ??????????????

2
??

• ????(???????)
• AirFolder???????a
• ??
• ???????
• ??????

3
????(???????)

• P2P??
• ?????????subversion??

4
P2P??

• ?????????(??)???????????????????????????????????
• ????????????PC?????PC?????????????????
• ??
• ???????? to ????????????????????etc.
• ?????? to PC on/off?????????????????????etc.
• ????????? to PC???????????etc.

5
?????????subversion??

• ??????????????????????????????????????????????????
  ????????
• Subversion
• CVS????????????????????????????????????(better
  CVS)
• ????(??????)???????(copymerge??)

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AirFolder???????a

• Commit????????
• ????????commit???????
• ??
• ???????????????
• ????????

7
Commit????????
subversion???
update(download)
BUSY
sourceforge???(?????) gt ??????????????(????)
H???????????commit??? gt ??????????????????????
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????????commit???????
subversion???
commit
???????????
commit????
9
??????????????(a)
commit
update(download)
??????????????????commit??????????????? ???????
???????????????????????????
10
????????(a)

• ????????????????????(????????)

???
???
???????????????????????????? ?????????????????????
???????????????? ????????????PC???????????????? ?
????????????????
11
??
12
???????

• ?????????
• ??????
• ??????
• ???????

13
?????????(1/4)

• flooding small world QRP overlay
• ???????????????????????????????
• ??????????????????????
• ??????????????????????

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?????????(2/4)

• ??????

• LAN?????????????????

??? (???????????????)

• LAN???????

• ????????

netid-a(128bit)
UDP????????(???????)?????TCP???
netid-b(128bit)
????????(on netid-b)
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?????????(3/4)

• ??????

• QRP(Query Routing Protocol)

Lookup
Lookup
Lookup
Bloom filter ????????????????? ???????????
x
TCP(unicast)?? overlay??????

• lookup-hit?advertisement

• small world???

Lookup
Lookup
???????????? ?????ID??? _at_see ???????????
Hit
Hit
TCP?????
Advt
Advt
?????
16
?????????(4/4)

• NAT??3?FW??(HTTP?????)

• NAT??1

NAT box
get
data
lookup
lookup
UPnP NAT traversal
hit
hit
gwreq
gwreq

• NAT??2

lookup
?????
Hit
pushreq
data
data
get
get
get
data
17
??????(1/4)

• 3 types, 2 classes,????????

?????????
??????
file-id,last-rev file-id,last-rev file-id,las
t-rev
!/bin/sh
??????????? (lookup????)
Size Comment-1 Comment-2 Comment-n
??????
?????????? (advt????)
???????? ????(useridtimeus)
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??????(2/4)

• Conflict (almost) free merge

?????????
?? ???????(?????????????) ?????????ID???
??????????????? ??????0???????
file-id,last-rev file-id,last-rev file-id,las
t-rev
id-a,rev1 id-b,rev1
id-a,rev2 id-c,rev1
???
A??
A??
id-a,rev2 id-b,rev1 id-c,rev1
id-a??????????rev1 ????A?????
19
??????(3/4)

• ???????????????

B??
A??
lookup (B???????????)
hit
id-a,rev-x id-b,rev-y id-c,rev-z
id-a,rev-x id-b,rev-y id-c,rev-z
id-a meta
id-b meta
Semantic filter
id-c meta
id-a file
id-c file
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??????(4/4)

• ??????(A???PC)

?????
A???????
id-a,rev2,u-A,u-B id-b,rev2,u-A id-c,rev2,u-A
id-e,rev1,u-B id-f,rev3,u-B
UI
id-a,rev1 id-b,rev2 id-c,rev2
???? ????????
??????
?????????
????????
B???????
id-a,meta id-b,meta id-c,meta id-e,meta i
d-f,meta
id-a,rev2 id-e,rev1 id-f,rev3
????
??? ?????
???????????
21
??????(1/3)

• CA(???)??????

CA
X.509 DNuidinoue_at_ariel-networks.com,dcariel-net
works,dccom (_at_see rfc2377)
RSA?????
??????
cert????????(????) CA?????????(CRL?????)
X.509??????(AC)??? ???(???)???????????P2P??advt
22
??????(2/3)

• ?????????

???(???????)
???
user-A,???room key user-B,???room
key user-C,???room key
???
???
??????
!/bin/sh
??? ?????
23
??????(3/3)

• ??????????

cert(pub-key)
Encrypted by fixed-key
session-key
Encrypted by pub-key
Encrypted by session key
session key d
session key a
session key c
session key b
24
??????
AirFolder
wxWidgets(UI)
Ariel Framework(P2P)
Libapr(portability)
Expat(XML parser)
Openssl(security)
Windows
GNU/Linux
25
??????

• adhoc??????????????????
• ASP(sourceforge??)????????????????????????????????
  ??
• ????????????
• ???subversion??????????????????(??)
• ???????????????????PC????????
• Subversion????????????????????
• ??????subversion???????????
• ???????????????P2P????????????(???????)