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Initial working Kademlia network - peer list exchange is working!

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Using the announcement and response messages to exchange peer lists. Fixes in encoding.
Add arbitrary Info structure to DHT Lite/Node.
This commit is contained in:
Kleissner
2021-03-15 22:25:05 +01:00
parent 323f379ee7
commit 3080119fc1
13 changed files with 210 additions and 33 deletions
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43
Message Encoding.go
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@@ -9,6 +9,7 @@ Intermediary between low-level packets and high-level interpretation.
package core
import (
"bytes"
"encoding/binary"
"errors"
"net"
@@ -336,7 +337,7 @@ func decodeInfoPeer(data []byte, count int) (hash2Peers []Hash2Peer, read int, v
hash := make([]byte, hashSize)
copy(hash, data[index:index+32])
countField := binary.LittleEndian.Uint16(data[index+33 : index+33+2])
countField := binary.LittleEndian.Uint16(data[index+32 : index+32+2])
index += 34
hash2Peer := Hash2Peer{ID: KeyHash{hash}}
@@ -350,15 +351,22 @@ func decodeInfoPeer(data []byte, count int) (hash2Peers []Hash2Peer, read int, v
peer := InfoPeer{}
peerIDcompressed := make([]byte, 33)
copy(peerIDcompressed[:], data[index:33])
copy(peerIDcompressed[:], data[index:index+33])
ipB := make([]byte, 16)
copy(ipB[:], data[index+33:33+16])
copy(ipB[:], data[index+33:index+33+16])
peer.IP = ipB
peer.Port = binary.LittleEndian.Uint16(data[index+49 : index+49+2])
peer.LastContact = binary.LittleEndian.Uint32(data[index+51 : index+51+4])
reason := data[55]
reason := data[index+55]
var err error
if peer.PublicKey, err = btcec.ParsePubKey(peerIDcompressed, btcec.S256()); err != nil {
return nil, 0, false
}
peer.NodeID = publicKey2NodeID(peer.PublicKey)
if reason == 0 { // Peer was returned because it is close to the requested hash
hash2Peer.Closest = append(hash2Peer.Closest, peer)
@@ -398,7 +406,10 @@ func decodeEmbeddedFile(data []byte, count int) (filesEmbed []EmbeddedFileData,
index += sizeField
// TODO validate hash
// validate the hash
if !bytes.Equal(hash, hashData(fileData)) {
return nil, read, false
}
filesEmbed = append(filesEmbed, EmbeddedFileData{ID: KeyHash{Hash: hash}, Data: fileData})
}
@@ -611,7 +622,7 @@ createPacketLoop:
copy(raw[index+33:index+33+16], peer.IP)
binary.LittleEndian.PutUint16(raw[index+49:index+51], peer.Port)
binary.LittleEndian.PutUint32(raw[index+51:index+55], peer.LastContact)
raw[index+55] = 0
raw[index+55] = 1
packetSize += 56
binary.LittleEndian.PutUint16(raw[count2Index+0:count2Index+2], uint16(m+1))
@@ -633,7 +644,7 @@ createPacketLoop:
copy(raw[index+33:index+33+16], peer.IP)
binary.LittleEndian.PutUint16(raw[index+49:index+51], peer.Port)
binary.LittleEndian.PutUint32(raw[index+51:index+55], peer.LastContact)
raw[index+55] = 1
raw[index+55] = 0
packetSize += 56
count2++
@@ -719,9 +730,23 @@ func (peer *PeerInfo) Chat(text string) {
}
// sendAnnouncement sends the announcement message
func (peer *PeerInfo) sendAnnouncement() {
func (peer *PeerInfo) sendAnnouncement(sendUA, findSelf bool, findPeer []KeyHash, findValue []KeyHash, files []InfoStore) (err error) {
packets, err := msgEncodeAnnouncement(sendUA, findSelf, findPeer, findValue, files)
for _, packet := range packets {
peer.send(&PacketRaw{Command: CommandAnnouncement, Payload: packet})
}
return err
}
// sendResponse sends the response message
func (peer *PeerInfo) sendResponse() {
func (peer *PeerInfo) sendResponse(sendUA bool, hash2Peers []Hash2Peer, filesEmbed []EmbeddedFileData, hashesNotFound [][]byte) (err error) {
packets, err := msgEncodeResponse(sendUA, hash2Peers, filesEmbed, hashesNotFound)
for _, packet := range packets {
peer.send(&PacketRaw{Command: CommandResponse, Payload: packet})
}
return err
}