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file transfer doc

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Zlatin Balevsky
2018-07-04 14:19:20 +01:00
parent 0b4c41e7b3
commit 8b6d8e3dc9
1 changed files with 14 additions and 1 deletions
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doc/design.md
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@@ -15,4 +15,17 @@ Each node, be it leaf or ultrapeer will open two I2P tunnels - one for incoming
Leafs send search requests to all ultrapeers they are connected to. Ultrapeers in turn forward those queries, as well as any queries made by the local user to ALL neighboring ultrapeers, setting a flag "firstHop" to "true". When an ultrapeer receives a query with that flag set to true, it will clear the flag and forward it only to those neighboring ultrapeers that have a keyword hit in their Bloom filter, as well as to any local leafs that match the keyword search. When an ultrapeer receives a query with the "firstHop" flag set o false, it will only forward it to any of its connected leafs that match the keyword search.
This is equivalent to setting the maximum TTL in Gnutella to 1.
This is equivalent to setting the maximum TTL in Gnutella to 1.
### File transfer
Files are transferred over HTTP1.1 protocol with some custom headers added for download mesh management. Files are requested with a GET request which includes the infohash of the file in the URL.
### List of hashes transfer
Before issuing any GET requests for actual content, it is necessary to acquire the list of hashes of the pieces of the file. This is done by appending "/hashlist" to the URL after the infohash. The server will then respond with a body containing list of binary SHA256 hashes of the pieces of the file. Clients are encouraged to then verify that the SHA256 hash of this list matches the infohash of the file as presented in the search result.
### Mesh management
Download mesh management is identical to Gnutella, except instead of ip addresses b64 I2P destinations are used. [More information](http://rfc-gnutella.sourceforge.net/developer/tmp/download-mesh.html)