mirror of
https://github.com/ethereum/go-ethereum.git
synced 2026-07-27 23:26:44 +00:00
244 lines
6.5 KiB
Go
244 lines
6.5 KiB
Go
// Copyright 2016 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// The go-ethereum library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package network
|
|
|
|
import (
|
|
"fmt"
|
|
"time"
|
|
|
|
"github.com/ethereum/go-ethereum/crypto"
|
|
"github.com/ethereum/go-ethereum/logger/glog"
|
|
"github.com/ethereum/go-ethereum/p2p"
|
|
"github.com/ethereum/go-ethereum/p2p/adapters"
|
|
"github.com/ethereum/go-ethereum/p2p/discover"
|
|
"github.com/ethereum/go-ethereum/p2p/protocols"
|
|
"github.com/ethereum/go-ethereum/pot"
|
|
)
|
|
|
|
const (
|
|
ProtocolName = "bzz"
|
|
Version = 0
|
|
NetworkId = 322 // BZZ in l33t
|
|
ProtocolMaxMsgSize = 10 * 1024 * 1024
|
|
)
|
|
|
|
// bzz is the bzz protocol view of a protocols.Peer (itself an extension of p2p.Peer)
|
|
type bzzPeer struct {
|
|
*protocols.Peer
|
|
localAddr *peerAddr
|
|
*peerAddr // remote address
|
|
lastActive time.Time
|
|
//peers map[discover.NodeID]bool
|
|
}
|
|
|
|
func (self *bzzPeer) LastActive() time.Time {
|
|
return self.lastActive
|
|
}
|
|
|
|
// implemented by peerAddr
|
|
type PeerAddr interface {
|
|
OverlayAddr() []byte
|
|
UnderlayAddr() []byte
|
|
PO(pot.PotVal, int) (int, bool)
|
|
String() string
|
|
}
|
|
|
|
// the Peer interface that peerPool needs
|
|
type Peer interface {
|
|
PeerAddr
|
|
// String() string // pretty printable the Node
|
|
ID() discover.NodeID // the key that uniquely identifies the Node for the peerPool
|
|
Send(interface{}) error // can send messages
|
|
Drop(error) // disconnect this peer
|
|
Register(interface{}, func(interface{}) error) uint64 // register message-handler callbacks
|
|
DisconnectHook(func(error))
|
|
}
|
|
|
|
func BzzCodeMap(msgs ...interface{}) *protocols.CodeMap {
|
|
ct := protocols.NewCodeMap(ProtocolName, Version, ProtocolMaxMsgSize)
|
|
ct.Register(&bzzHandshake{})
|
|
ct.Register(msgs...)
|
|
return ct
|
|
}
|
|
|
|
// Bzz is the protocol constructor
|
|
// returns p2p.Protocol that is to be offered by the node.Service
|
|
func Bzz(oAddr, uAddr []byte, ct *protocols.CodeMap, services func(Peer) error, peerInfo func(id discover.NodeID) interface{}, nodeInfo func() interface{}) *p2p.Protocol {
|
|
run := func(p *protocols.Peer) error {
|
|
bee := &bzzPeer{
|
|
Peer: p,
|
|
localAddr: &peerAddr{oAddr, uAddr},
|
|
}
|
|
// protocol handshake and its validation
|
|
// sets remote peer address
|
|
err := bee.bzzHandshake()
|
|
if err != nil {
|
|
glog.V(6).Infof("handshake error in peer %v: %v", bee.ID(), err)
|
|
return err
|
|
}
|
|
|
|
// mount external service models on the peer connection (swap, sync, hive)
|
|
if services != nil {
|
|
err = services(bee)
|
|
if err != nil {
|
|
glog.V(6).Infof("protocol service error for peer %v: %v", bee.ID(), err)
|
|
return err
|
|
}
|
|
}
|
|
|
|
return bee.Run()
|
|
}
|
|
|
|
return protocols.NewProtocol(ProtocolName, Version, run, ct, peerInfo, nodeInfo)
|
|
}
|
|
|
|
/*
|
|
Handshake
|
|
|
|
* Version: 8 byte integer version of the protocol
|
|
* NetworkID: 8 byte integer network identifier
|
|
* Addr: the address advertised by the node including underlay and overlay connecctions
|
|
*/
|
|
type bzzHandshake struct {
|
|
Version uint64
|
|
NetworkId uint64
|
|
Addr *peerAddr
|
|
}
|
|
|
|
func (self *bzzHandshake) String() string {
|
|
return fmt.Sprintf("Handshake: Version: %v, NetworkId: %v, Addr: %v", self.Version, self.NetworkId, self.Addr)
|
|
}
|
|
|
|
// peerAddr implements the PeerAddress interface
|
|
type peerAddr struct {
|
|
OAddr []byte
|
|
UAddr []byte
|
|
}
|
|
|
|
func (self *peerAddr) OverlayAddr() []byte {
|
|
return self.OAddr
|
|
}
|
|
|
|
func (self *peerAddr) UnderlayAddr() []byte {
|
|
return self.UAddr
|
|
}
|
|
|
|
func (self *peerAddr) PO(val pot.PotVal, pos int) (int, bool) {
|
|
kp := val.(PeerAddr)
|
|
one := kp.OverlayAddr()
|
|
other := self.OAddr
|
|
for i := pos / 8; i < len(one); i++ {
|
|
if one[i] == other[i] {
|
|
continue
|
|
}
|
|
oxo := one[i] ^ other[i]
|
|
start := 0
|
|
if i == pos/8 {
|
|
start = pos % 8
|
|
}
|
|
for j := start; j < 8; j++ {
|
|
if (uint8(oxo)>>uint8(7-j))&0x01 != 0 {
|
|
return i*8 + j, false
|
|
}
|
|
}
|
|
}
|
|
return len(one) * 8, true
|
|
// var ha *pot.HashAddress
|
|
// var left, right string
|
|
// if ok {
|
|
// ha = kp.HashAddress
|
|
// } else {
|
|
// ha = val.(*pot.HashAddress)
|
|
// }
|
|
}
|
|
|
|
func (self *peerAddr) String() string {
|
|
return fmt.Sprintf("%x <%x>", self.OAddr, self.UAddr)
|
|
}
|
|
|
|
// bzzHandshake negotiates the bzz master handshake
|
|
// and validates the response, returns error when
|
|
// mismatch/incompatibility is evident
|
|
func (self *bzzPeer) bzzHandshake() error {
|
|
|
|
lhs := &bzzHandshake{
|
|
Version: uint64(Version),
|
|
NetworkId: uint64(NetworkId),
|
|
Addr: self.localAddr,
|
|
}
|
|
|
|
hs, err := self.Handshake(lhs)
|
|
if err != nil {
|
|
glog.V(6).Infof("handshake failed: %v", err)
|
|
return err
|
|
}
|
|
|
|
rhs := hs.(*bzzHandshake)
|
|
self.peerAddr = rhs.Addr
|
|
err = checkBzzHandshake(rhs)
|
|
if err != nil {
|
|
glog.V(6).Infof("handshake between %v and %v failed: %v", self.localAddr, self.peerAddr, err)
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
// checkBzzHandshake checks for the validity and compatibility of the remote handshake
|
|
func checkBzzHandshake(rhs *bzzHandshake) error {
|
|
|
|
if NetworkId != rhs.NetworkId {
|
|
return fmt.Errorf("network id mismatch %d (!= %d)", rhs.NetworkId, NetworkId)
|
|
}
|
|
|
|
if Version != rhs.Version {
|
|
return fmt.Errorf("version mismatch %d (!= %d)", rhs.Version, Version)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// RandomAddr is a utility method generating an address from a public key
|
|
func RandomAddr() *peerAddr {
|
|
key, err := crypto.GenerateKey()
|
|
if err != nil {
|
|
panic("unable to generate key")
|
|
}
|
|
pubkey := crypto.FromECDSAPub(&key.PublicKey)
|
|
var id discover.NodeID
|
|
copy(id[:], pubkey[1:])
|
|
return &peerAddr{
|
|
OAddr: crypto.Keccak256(pubkey[1:]),
|
|
UAddr: id[:],
|
|
}
|
|
}
|
|
|
|
// NodeId transforms the underlay address to an adapters.NodeId
|
|
func NodeId(addr PeerAddr) *adapters.NodeId {
|
|
return adapters.NewNodeId(addr.UnderlayAddr())
|
|
}
|
|
|
|
// NewPeerAddrFromNodeId constucts a peerAddr from an adapters.NodeId
|
|
// the overlay address is derived as the hash of the nodeId
|
|
func NewPeerAddrFromNodeId(n *adapters.NodeId) *peerAddr {
|
|
id := n.NodeID
|
|
return &peerAddr{
|
|
OAddr: crypto.Keccak256(id[:]),
|
|
UAddr: id[:],
|
|
}
|
|
}
|