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daemon.go
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daemon.go
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package main
import (
"io"
"sync"
"time"
pb "github.com/vyzo/libp2p-flare-test/pb"
"github.com/vyzo/libp2p-flare-test/proto"
"github.com/libp2p/go-libp2p-core/host"
"github.com/libp2p/go-libp2p-core/network"
"github.com/libp2p/go-libp2p-core/peer"
"github.com/libp2p/go-msgio/protoio"
ma "github.com/multiformats/go-multiaddr"
)
const maxMsgSize = 4096
type Daemon struct {
sync.Mutex
secret string
peers map[string]map[peer.ID]*ClientInfo
}
type ClientInfo struct {
nick string
pi peer.AddrInfo
}
func NewDaemon(h host.Host, cfg *Config) *Daemon {
daemon := &Daemon{
secret: cfg.Secret,
peers: make(map[string]map[peer.ID]*ClientInfo),
}
h.SetStreamHandler(proto.ProtoID, daemon.handleStream)
h.Network().Notify(&network.NotifyBundle{
DisconnectedF: daemon.disconnect,
})
return daemon
}
func (d *Daemon) disconnect(n network.Network, c network.Conn) {
p := c.RemotePeer()
d.Lock()
defer d.Unlock()
for _, peers := range d.peers {
delete(peers, p)
}
}
func (d *Daemon) handleStream(s network.Stream) {
defer s.Close()
p := s.Conn().RemotePeer()
log.Debugf("incoming stream from %s at %s", p, s.Conn().RemoteMultiaddr())
var msg pb.FlareMessage
wr := protoio.NewDelimitedWriter(s)
rd := protoio.NewDelimitedReader(s, maxMsgSize)
// Authenticate peer
s.SetDeadline(time.Now().Add(time.Minute))
if err := rd.ReadMsg(&msg); err != nil {
log.Warnf("error reading authen message from %s: %s", p, err)
s.Reset()
return
}
if t := msg.GetType(); t != pb.FlareMessage_AUTHEN {
log.Warnf("expected authen message from %s, got %d", p, t)
s.Reset()
return
}
auth := msg.GetAuthen()
if auth == nil {
log.Warnf("missing authentication from %s", p)
s.Reset()
return
}
authNonce := auth.GetNonce()
salt, err := proto.Nonce()
if err != nil {
log.Warnf("error generating salt for %s: %s", p, err)
s.Reset()
return
}
proof := proto.Proof(d.secret, salt, authNonce)
challengeNonce, err := proto.Nonce()
if err != nil {
log.Warnf("error generating nonce for %s: %s", p, err)
s.Reset()
return
}
msg.Reset()
msg.Type = pb.FlareMessage_CHALLENGE.Enum()
msg.Challenge = &pb.Challenge{
Proof: proof,
Salt: salt,
Nonce: challengeNonce,
}
if err := wr.WriteMsg(&msg); err != nil {
log.Warnf("error writing challenge message to %s: %s", p, err)
s.Reset()
return
}
msg.Reset()
if err := rd.ReadMsg(&msg); err != nil {
log.Warnf("error reading response message from %s: %s", p, err)
s.Reset()
return
}
s.SetDeadline(time.Time{})
if t := msg.GetType(); t != pb.FlareMessage_RESPONSE {
log.Warnf("expected response message from %s, got %d", p, t)
s.Reset()
return
}
resp := msg.GetResponse()
if resp == nil {
log.Warnf("missing response from %s", p)
s.Reset()
return
}
proof = resp.GetProof()
salt = resp.GetSalt()
if !proto.Verify(d.secret, salt, challengeNonce, proof) {
log.Errorf("authentication failure from %s", p)
s.Reset()
return
}
log.Infof("peer %s successfully authenticated", p)
// client is authenticated, handle announcements and peer requests
for {
msg.Reset()
if err := rd.ReadMsg(&msg); err != nil {
if err == io.EOF {
return
}
log.Warnf("error reading message from %s: %s", p, err)
s.Reset()
return
}
switch t := msg.GetType(); t {
case pb.FlareMessage_ANNOUNCE:
ann := msg.GetAnnounce()
if ann == nil {
log.Warnf("missing announce from %s", p)
s.Reset()
return
}
domain := ann.GetDomain()
cinfo, err := clientInfoFromPeerInfo(ann.GetPeerInfo())
if err != nil {
log.Warnf("malformed announce from %s: %s", p, err)
s.Reset()
return
}
if cinfo.pi.ID != p {
log.Warnf("annunce for bogus peer ID %s from %s", cinfo.pi.ID, p)
s.Reset()
return
}
log.Infof("peer %s announced presence", p)
d.Lock()
peers, ok := d.peers[domain]
if !ok {
peers = make(map[peer.ID]*ClientInfo)
d.peers[domain] = peers
}
peers[p] = cinfo
d.Unlock()
case pb.FlareMessage_GETPEERS:
getPeers := msg.GetGetPeers()
if getPeers == nil {
log.Warnf("missing getPeers from %s", p)
s.Reset()
return
}
domain := getPeers.GetDomain()
var pis []*pb.PeerInfo
d.Lock()
peers, ok := d.peers[domain]
if ok {
for _, info := range peers {
if info.pi.ID == p {
continue
}
pi := peerInfoFromClientInfo(info)
pis = append(pis, pi)
}
}
d.Unlock()
msg.Reset()
msg.Type = pb.FlareMessage_PEERLIST.Enum()
msg.PeerList = &pb.PeerList{Peers: pis}
if err := wr.WriteMsg(&msg); err != nil {
log.Warnf("error writing message to %s: %s", p, err)
s.Reset()
return
}
default:
log.Warnf("unexpected message from %s: expected ANNOUNCE or GETPEERS, got %d", p, t)
s.Reset()
return
}
}
}
func clientInfoFromPeerInfo(pi *pb.PeerInfo) (*ClientInfo, error) {
result := new(ClientInfo)
result.nick = pi.GetNick()
pid, err := peer.IDFromBytes(pi.GetPeerID())
if err != nil {
return nil, err
}
result.pi.ID = pid
for _, ab := range pi.GetAddrs() {
a, err := ma.NewMultiaddrBytes(ab)
if err != nil {
return nil, err
}
result.pi.Addrs = append(result.pi.Addrs, a)
}
return result, nil
}
func peerInfoFromClientInfo(info *ClientInfo) *pb.PeerInfo {
result := &pb.PeerInfo{
Nick: &info.nick,
PeerID: []byte(info.pi.ID),
}
for _, a := range info.pi.Addrs {
result.Addrs = append(result.Addrs, a.Bytes())
}
return result
}