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router.go
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router.go
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package router
import (
"context"
"golang.org/x/crypto/ed25519"
"math"
"net"
"sync"
"time"
"github.com/libp2p/go-libp2p-core/protocol"
"github.com/multiformats/go-multiaddr"
"github.com/my-network/ipvpn/network"
"github.com/my-network/ipvpn/vpn"
"github.com/my-network/routewrapper"
"github.com/xaionaro-go/atomicmap"
"github.com/xaionaro-go/errors"
)
const (
routerProtocolID = protocol.ID(`/p2p/github.com/my-network/ipvpn/router`)
)
type Router struct {
context context.Context
stopFunc context.CancelFunc
locker sync.RWMutex
routeMgmt routewrapper.Routing
mesh *network.Network
logger Logger
peers atomicmap.Map
}
func New(logger Logger) *Router {
routeMgmt, err := routewrapper.NewRouteWrapper()
if err != nil {
panic(err)
}
router := &Router{
routeMgmt: routeMgmt,
logger: logger,
peers: atomicmap.New(),
}
router.context, router.stopFunc = context.WithCancel(context.Background())
router.start()
return router
}
func (router *Router) start() {
go func() {
ticker := time.NewTicker(time.Hour)
for {
select {
case <-router.context.Done():
return
case <-ticker.C:
}
router.updateRoutes()
}
}()
}
func (router *Router) ProtocolID() protocol.ID {
return routerProtocolID
}
func (router *Router) SetNetwork(mesh *network.Network) {
router.mesh = mesh
}
func (router *Router) OnUpdateMyIP(ip net.IP) {
}
func (router *Router) OnNewRoute(peerID PeerID, chType vpn.ChannelType, ip net.IP) {
router.logger.Debugf(`OnNewRoute(%v, %v, %v)`, peerID, chType, ip)
router.considerNewRoute(router.createPeerIfNotExists(peerID), chType, ip)
}
func (router *Router) GetPeer(peerID PeerID) *Peer {
peerI, _ := router.peers.Get(peerID)
if peerI == nil {
return nil
}
return peerI.(*Peer)
}
func (router *Router) createPeerIfNotExists(peerID PeerID) (peer *Peer) {
peer = router.GetPeer(peerID)
if peer != nil {
return
}
router.locker.Lock()
if peer = router.GetPeer(peerID); peer == nil {
peer = newPeer(router, peerID)
_ = router.peers.Set(peerID, peer)
}
router.locker.Unlock()
return
}
func (router *Router) updateRoutes() {
for _, peerID := range router.peers.Keys() {
peer, _ := router.peers.Get(peerID)
if peer == nil {
continue
}
router.updatePeerRoutes(peer.(*Peer))
}
}
func (router *Router) updatePeerRoutes(peer *Peer) {
router.logger.Debugf(`considerNewRoute: measuring latencies`)
ctx := peer.MeasureLatencies(nil)
osRoutes, err := router.routeMgmt.Routes()
if err != nil {
router.logger.Error(errors.Wrap(err, `unable to get current routes`))
return
}
oldRoutes := map[string]*routewrapper.Route{}
for idx := range osRoutes {
osRoute := &osRoutes[idx]
oldRoutes[osRoute.Gateway.String()] = osRoute
}
ipnet := net.IPNet{
IP: peer.IP(),
}
if peer.IP().To4() == nil {
ipnet.Mask = net.CIDRMask(32, 32)
} else {
ipnet.Mask = net.CIDRMask(128, 128)
}
select {
case <-ctx.Done():
}
for _, route := range peer.DirectRoutes() {
ip := route.Destination()
metric := int(1000 + math.Log2(float64(route.Latency().Nanoseconds()))*100)
switch route.channelType {
case ChannelTypeDirect:
case ChannelTypeTunnel:
metric += 50
case ChannelTypeIPFS:
metric += 100
}
metric += int(float64(300) * route.TimedOutFraction())
oldRoute := oldRoutes[ip.String()]
if oldRoute != nil {
if oldRoute.Metric == metric {
continue
}
router.logger.Debugf(`considerNewRoute: removing an old route %v`, oldRoute)
err := router.routeMgmt.RemoveRoute(*oldRoute)
if err != nil {
router.logger.Error(errors.Wrap(err, `unable to remove an old route`, oldRoute))
}
}
newRoute := routewrapper.Route{
Destination: ipnet,
Gateway: ip,
Metric: metric,
}
router.logger.Debugf(`considerNewRoute: adding a new route %v`, newRoute)
err := router.routeMgmt.AddRoute(newRoute)
if err != nil {
router.logger.Error(errors.Wrap(err, `unable to add a new route`, newRoute))
}
}
}
func (router *Router) considerNewRoute(peer *Peer, chType vpn.ChannelType, ip net.IP) {
if chType == ChannelTypeAutoRouted {
peer.SetIP(ip)
return
}
peer.SetDirectRoute(chType, ip)
for _, delay := range []time.Duration{
time.Second,
5 * time.Second,
30 * time.Second,
time.Minute,
5 * time.Minute,
} {
router.logger.Debugf(`considerNewRoute: sleep for %v`, delay)
time.Sleep(delay)
router.updatePeerRoutes(peer)
}
}
func (router *Router) NewIncomingStream(stream Stream, peerAddr AddrInfo) {
router.logger.Debugf(`new stream from %v`, peerAddr.ID)
peer := router.createPeerIfNotExists(peerAddr.ID)
peer.LockDo(func() {
streamIngoingOld := peer.streamIngoing
peer.streamIngoing = stream
if streamIngoingOld != nil {
router.logger.Debugf(`closing old ingoing stream from %v`, peer.ID())
_ = streamIngoingOld.Close()
}
})
}
func (router *Router) OnRemoveRoute(peerID PeerID, chType vpn.ChannelType) {
}
func (router *Router) OnPeerConnect(peerID PeerID) {
}
func (router *Router) ConsiderKnownPeer(peerAddr AddrInfo) {
}
func (router *Router) SetID(id PeerID) {
}
func (router *Router) SetPrivateKey(privKey ed25519.PrivateKey) {
}
func (router *Router) SetPSK(psk []byte) {
}
func (router *Router) SetMyAddrs(addrs []multiaddr.Multiaddr) {
}
func (router *Router) IsBadAddress(maddr multiaddr.Multiaddr) bool {
return false
}
func (router *Router) Start() error {
return nil
}
func (router *Router) Close() error {
router.stopFunc()
return nil
}