📚 Reti Peer To Peer - Università degli Studi di Ferrara 📚
A peer-to-peer server based on Kazaa's approach:
Hierarchic
- Super-nodes managing their peers
- On startup, the client contacts a super-node (and may later become one)
- Publish: client sends list of files to its super-node
- Search: send query to super-node, and the super- nodes flood queries among themselves
- Fetch: get file directly from peer(s); can fetch from multiple peers at once
- Each peer is either a group leader or assigned to a group leader
- Group leader tracks the content in all its children
- Query consolidation ** Many connected nodes may have only a few files ** Propagating query to a sub-node may take more time than for the super-node to answer itself
- Stability ** Super-node selection favors nodes with high up-time ** How long you’ve been on is a good predictor of how long you’ll be around in the future
python3 AlaKazaam.pyNote: Python 3.6 or above is required
[xxxB] = the parameter length in bytes
# Search a Supernode
SUPE[4B].Pktid[16B].IPP2P[55B].PP2P[5B].TTL[2B]
# Response will be
ASUP[4B].Pktid[16B].IPP2P[55B].PP2P[5B]
# Login
LOGI[4B].IPP2P[55B].PP2P[5B]
# Response will be
ALGI[4B].SessionID[16B]
# Add a file
ADFF[4B].SessionID[16B].Filemd5[32B].Filename[100B]
# No response from the server
# Remove a file
DEFF[4B].SessionID[16B].Filemd5[32B]
# No response from the server
# Logout
LOGO[4B].SessionID[16B]
# Response will be
ALGO[4B].\#delete[3B]
# Search a file
QUER[4B].Pktid[16B].IPP2P[55B].PP2P[5B].TTL[2B].Ricerca[20B]
# Response will be
AQUE[4B].Pktid[16B].IPP2P[55B].PP2P[5B].Filemd5[32B].Filename[100B]
# Choose a file among the supernodes
FIND[4B].SessionID[16B].Ricerca[20B]
# Response will be
AFIN[4B].\#idmd5[3B].{Filemd5_i[32B].Filename_i[100B].\#copy_i[3B].{IPP2P_i_j[55B].PP2P_i_j[5B]}(j=1..\#copy_i)}(i=1..\#idmd5)
# Retrieve a file
RETR[4B].Filemd5[16B]
# Response will be
ARET[4B].\#chunk[6B].{Lenchunk_i[5B].data[LB]}(i=1..\#chunk)Enjoy 😎