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[relay,client] Relay/fix/wg roaming (#2691)

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If a peer connection switches from Relayed to ICE P2P, the Relayed proxy still consumes the data the other peer sends. Because the proxy is operating, the WireGuard switches back to the Relayed proxy automatically, thanks to the roaming feature.

Extend the Proxy implementation with pause/resume functions. Before switching to the p2p connection, pause the WireGuard proxy operation to prevent unnecessary package sources.
Consider waiting some milliseconds after the pause to be sure the WireGuard engine already processed all UDP msg in from the pipe.
This commit is contained in:
Zoltan Papp 2024-10-11 16:24:30 +02:00 committed by GitHub
parent b2379175fe
commit 0e95f16cdd
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
6 changed files with 298 additions and 168 deletions
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215
client/internal/peer/conn.go
View File

@ -82,8 +82,6 @@ type Conn struct {
config ConnConfig
statusRecorder *Status
wgProxyFactory *wgproxy.Factory
wgProxyICE wgproxy.Proxy
wgProxyRelay wgproxy.Proxy
signaler *Signaler
iFaceDiscover stdnet.ExternalIFaceDiscover
relayManager *relayClient.Manager
@ -106,7 +104,8 @@ type Conn struct {
beforeAddPeerHooks []nbnet.AddHookFunc
afterRemovePeerHooks []nbnet.RemoveHookFunc
endpointRelay *net.UDPAddr
wgProxyICE wgproxy.Proxy
wgProxyRelay wgproxy.Proxy
// for reconnection operations
iCEDisconnected chan bool
@ -257,8 +256,7 @@ func (conn *Conn) Close() {
conn.wgProxyICE = nil
}
err := conn.config.WgConfig.WgInterface.RemovePeer(conn.config.WgConfig.RemoteKey)
if err != nil {
if err := conn.removeWgPeer(); err != nil {
conn.log.Errorf("failed to remove wg endpoint: %v", err)
}
@ -430,54 +428,59 @@ func (conn *Conn) iCEConnectionIsReady(priority ConnPriority, iceConnInfo ICECon
conn.log.Debugf("ICE connection is ready")
conn.statusICE.Set(StatusConnected)
defer conn.updateIceState(iceConnInfo)
if conn.currentConnPriority > priority {
conn.statusICE.Set(StatusConnected)
conn.updateIceState(iceConnInfo)
return
}
conn.log.Infof("set ICE to active connection")
endpoint, wgProxy, err := conn.getEndpointForICEConnInfo(iceConnInfo)
var (
ep *net.UDPAddr
wgProxy wgproxy.Proxy
err error
)
if iceConnInfo.RelayedOnLocal {
wgProxy, err = conn.newProxy(iceConnInfo.RemoteConn)
if err != nil {
conn.log.Errorf("failed to add turn net.Conn to local proxy: %v", err)
return
}
endpointUdpAddr, _ := net.ResolveUDPAddr(endpoint.Network(), endpoint.String())
conn.log.Debugf("Conn resolved IP is %s for endopint %s", endpoint, endpointUdpAddr.IP)
conn.connIDICE = nbnet.GenerateConnID()
for _, hook := range conn.beforeAddPeerHooks {
if err := hook(conn.connIDICE, endpointUdpAddr.IP); err != nil {
conn.log.Errorf("Before add peer hook failed: %v", err)
ep = wgProxy.EndpointAddr()
conn.wgProxyICE = wgProxy
} else {
directEp, err := net.ResolveUDPAddr("udp", iceConnInfo.RemoteConn.RemoteAddr().String())
if err != nil {
log.Errorf("failed to resolveUDPaddr")
conn.handleConfigurationFailure(err, nil)
return
}
ep = directEp
}
if err := conn.runBeforeAddPeerHooks(ep.IP); err != nil {
conn.log.Errorf("Before add peer hook failed: %v", err)
}
conn.workerRelay.DisableWgWatcher()
err = conn.configureWGEndpoint(endpointUdpAddr)
if err != nil {
if conn.wgProxyRelay != nil {
conn.wgProxyRelay.Pause()
}
if wgProxy != nil {
if err := wgProxy.CloseConn(); err != nil {
conn.log.Warnf("Failed to close turn connection: %v", err)
wgProxy.Work()
}
}
conn.log.Warnf("Failed to update wg peer configuration: %v", err)
if err = conn.configureWGEndpoint(ep); err != nil {
conn.handleConfigurationFailure(err, wgProxy)
return
}
wgConfigWorkaround()
if conn.wgProxyICE != nil {
if err := conn.wgProxyICE.CloseConn(); err != nil {
conn.log.Warnf("failed to close deprecated wg proxy conn: %v", err)
}
}
conn.wgProxyICE = wgProxy
conn.currentConnPriority = priority
conn.statusICE.Set(StatusConnected)
conn.updateIceState(iceConnInfo)
conn.doOnConnected(iceConnInfo.RosenpassPubKey, iceConnInfo.RosenpassAddr)
}
@ -492,11 +495,18 @@ func (conn *Conn) onWorkerICEStateDisconnected(newState ConnStatus) {
conn.log.Tracef("ICE connection state changed to %s", newState)
if conn.wgProxyICE != nil {
if err := conn.wgProxyICE.CloseConn(); err != nil {
conn.log.Warnf("failed to close deprecated wg proxy conn: %v", err)
}
}
// switch back to relay connection
if conn.endpointRelay != nil && conn.currentConnPriority != connPriorityRelay {
if conn.isReadyToUpgrade() {
conn.log.Debugf("ICE disconnected, set Relay to active connection")
err := conn.configureWGEndpoint(conn.endpointRelay)
if err != nil {
conn.wgProxyRelay.Work()
if err := conn.configureWGEndpoint(conn.wgProxyRelay.EndpointAddr()); err != nil {
conn.log.Errorf("failed to switch to relay conn: %v", err)
}
conn.workerRelay.EnableWgWatcher(conn.ctx)
@ -506,10 +516,7 @@ func (conn *Conn) onWorkerICEStateDisconnected(newState ConnStatus) {
changed := conn.statusICE.Get() != newState && newState != StatusConnecting
conn.statusICE.Set(newState)
select {
case conn.iCEDisconnected <- changed:
default:
}
conn.notifyReconnectLoopICEDisconnected(changed)
peerState := State{
PubKey: conn.config.Key,
@ -530,61 +537,48 @@ func (conn *Conn) relayConnectionIsReady(rci RelayConnInfo) {
if conn.ctx.Err() != nil {
if err := rci.relayedConn.Close(); err != nil {
log.Warnf("failed to close unnecessary relayed connection: %v", err)
conn.log.Warnf("failed to close unnecessary relayed connection: %v", err)
}
return
}
conn.log.Debugf("Relay connection is ready to use")
conn.statusRelay.Set(StatusConnected)
conn.log.Debugf("Relay connection has been established, setup the WireGuard")
wgProxy := conn.wgProxyFactory.GetProxy()
endpoint, err := wgProxy.AddTurnConn(conn.ctx, rci.relayedConn)
wgProxy, err := conn.newProxy(rci.relayedConn)
if err != nil {
conn.log.Errorf("failed to add relayed net.Conn to local proxy: %v", err)
return
}
conn.log.Infof("created new wgProxy for relay connection: %s", endpoint)
endpointUdpAddr, _ := net.ResolveUDPAddr(endpoint.Network(), endpoint.String())
conn.endpointRelay = endpointUdpAddr
conn.log.Debugf("conn resolved IP for %s: %s", endpoint, endpointUdpAddr.IP)
conn.log.Infof("created new wgProxy for relay connection: %s", wgProxy.EndpointAddr().String())
defer conn.updateRelayStatus(rci.relayedConn.RemoteAddr().String(), rci.rosenpassPubKey)
if conn.currentConnPriority > connPriorityRelay {
if conn.statusICE.Get() == StatusConnected {
log.Debugf("do not switch to relay because current priority is: %v", conn.currentConnPriority)
if conn.iceP2PIsActive() {
conn.log.Debugf("do not switch to relay because current priority is: %v", conn.currentConnPriority)
conn.wgProxyRelay = wgProxy
conn.statusRelay.Set(StatusConnected)
conn.updateRelayStatus(rci.relayedConn.RemoteAddr().String(), rci.rosenpassPubKey)
return
}
}
conn.connIDRelay = nbnet.GenerateConnID()
for _, hook := range conn.beforeAddPeerHooks {
if err := hook(conn.connIDRelay, endpointUdpAddr.IP); err != nil {
if err := conn.runBeforeAddPeerHooks(wgProxy.EndpointAddr().IP); err != nil {
conn.log.Errorf("Before add peer hook failed: %v", err)
}
}
err = conn.configureWGEndpoint(endpointUdpAddr)
if err != nil {
wgProxy.Work()
if err := conn.configureWGEndpoint(wgProxy.EndpointAddr()); err != nil {
if err := wgProxy.CloseConn(); err != nil {
conn.log.Warnf("Failed to close relay connection: %v", err)
}
conn.log.Errorf("Failed to update wg peer configuration: %v", err)
conn.log.Errorf("Failed to update WireGuard peer configuration: %v", err)
return
}
conn.workerRelay.EnableWgWatcher(conn.ctx)
wgConfigWorkaround()
if conn.wgProxyRelay != nil {
if err := conn.wgProxyRelay.CloseConn(); err != nil {
conn.log.Warnf("failed to close deprecated wg proxy conn: %v", err)
}
}
conn.wgProxyRelay = wgProxy
conn.currentConnPriority = connPriorityRelay
conn.statusRelay.Set(StatusConnected)
conn.wgProxyRelay = wgProxy
conn.updateRelayStatus(rci.relayedConn.RemoteAddr().String(), rci.rosenpassPubKey)
conn.log.Infof("start to communicate with peer via relay")
conn.doOnConnected(rci.rosenpassPubKey, rci.rosenpassAddr)
}
@ -597,29 +591,23 @@ func (conn *Conn) onWorkerRelayStateDisconnected() {
return
}
log.Debugf("relay connection is disconnected")
conn.log.Debugf("relay connection is disconnected")
if conn.currentConnPriority == connPriorityRelay {
log.Debugf("clean up WireGuard config")
err := conn.config.WgConfig.WgInterface.RemovePeer(conn.config.WgConfig.RemoteKey)
if err != nil {
conn.log.Debugf("clean up WireGuard config")
if err := conn.removeWgPeer(); err != nil {
conn.log.Errorf("failed to remove wg endpoint: %v", err)
}
}
if conn.wgProxyRelay != nil {
conn.endpointRelay = nil
_ = conn.wgProxyRelay.CloseConn()
conn.wgProxyRelay = nil
}
changed := conn.statusRelay.Get() != StatusDisconnected
conn.statusRelay.Set(StatusDisconnected)
select {
case conn.relayDisconnected <- changed:
default:
}
conn.notifyReconnectLoopRelayDisconnected(changed)
peerState := State{
PubKey: conn.config.Key,
@ -627,9 +615,7 @@ func (conn *Conn) onWorkerRelayStateDisconnected() {
Relayed: conn.isRelayed(),
ConnStatusUpdate: time.Now(),
}
err := conn.statusRecorder.UpdatePeerRelayedStateToDisconnected(peerState)
if err != nil {
if err := conn.statusRecorder.UpdatePeerRelayedStateToDisconnected(peerState); err != nil {
conn.log.Warnf("unable to save peer's state to Relay disconnected, got error: %v", err)
}
}
@ -765,6 +751,16 @@ func (conn *Conn) isConnected() bool {
return true
}
func (conn *Conn) runBeforeAddPeerHooks(ip net.IP) error {
conn.connIDICE = nbnet.GenerateConnID()
for _, hook := range conn.beforeAddPeerHooks {
if err := hook(conn.connIDICE, ip); err != nil {
return err
}
}
return nil
}
func (conn *Conn) freeUpConnID() {
if conn.connIDRelay != "" {
for _, hook := range conn.afterRemovePeerHooks {
@ -785,21 +781,52 @@ func (conn *Conn) freeUpConnID() {
}
}
func (conn *Conn) getEndpointForICEConnInfo(iceConnInfo ICEConnInfo) (net.Addr, wgproxy.Proxy, error) {
if !iceConnInfo.RelayedOnLocal {
return iceConnInfo.RemoteConn.RemoteAddr(), nil, nil
}
conn.log.Debugf("setup ice turn connection")
func (conn *Conn) newProxy(remoteConn net.Conn) (wgproxy.Proxy, error) {
conn.log.Debugf("setup proxied WireGuard connection")
wgProxy := conn.wgProxyFactory.GetProxy()
ep, err := wgProxy.AddTurnConn(conn.ctx, iceConnInfo.RemoteConn)
if err != nil {
if err := wgProxy.AddTurnConn(conn.ctx, remoteConn); err != nil {
conn.log.Errorf("failed to add turn net.Conn to local proxy: %v", err)
if errClose := wgProxy.CloseConn(); errClose != nil {
conn.log.Warnf("failed to close turn proxy connection: %v", errClose)
return nil, err
}
return nil, nil, err
return wgProxy, nil
}
func (conn *Conn) isReadyToUpgrade() bool {
return conn.wgProxyRelay != nil && conn.currentConnPriority != connPriorityRelay
}
func (conn *Conn) iceP2PIsActive() bool {
return conn.currentConnPriority == connPriorityICEP2P && conn.statusICE.Get() == StatusConnected
}
func (conn *Conn) removeWgPeer() error {
return conn.config.WgConfig.WgInterface.RemovePeer(conn.config.WgConfig.RemoteKey)
}
func (conn *Conn) notifyReconnectLoopRelayDisconnected(changed bool) {
select {
case conn.relayDisconnected <- changed:
default:
}
}
func (conn *Conn) notifyReconnectLoopICEDisconnected(changed bool) {
select {
case conn.iCEDisconnected <- changed:
default:
}
}
func (conn *Conn) handleConfigurationFailure(err error, wgProxy wgproxy.Proxy) {
conn.log.Warnf("Failed to update wg peer configuration: %v", err)
if wgProxy != nil {
if ierr := wgProxy.CloseConn(); ierr != nil {
conn.log.Warnf("Failed to close wg proxy: %v", ierr)
}
}
if conn.wgProxyRelay != nil {
conn.wgProxyRelay.Work()
}
return ep, wgProxy, nil
}
func isRosenpassEnabled(remoteRosenpassPubKey []byte) bool {

35
client/internal/wgproxy/ebpf/proxy.go
View File

@ -5,7 +5,6 @@ package ebpf
import (
"context"
"fmt"
"io"
"net"
"os"
"sync"
@ -94,13 +93,12 @@ func (p *WGEBPFProxy) Listen() error {
}
// AddTurnConn add new turn connection for the proxy
func (p *WGEBPFProxy) AddTurnConn(ctx context.Context, turnConn net.Conn) (net.Addr, error) {
func (p *WGEBPFProxy) AddTurnConn(turnConn net.Conn) (*net.UDPAddr, error) {
wgEndpointPort, err := p.storeTurnConn(turnConn)
if err != nil {
return nil, err
}
go p.proxyToLocal(ctx, wgEndpointPort, turnConn)
log.Infof("turn conn added to wg proxy store: %s, endpoint port: :%d", turnConn.RemoteAddr(), wgEndpointPort)
wgEndpoint := &net.UDPAddr{
@ -137,35 +135,6 @@ func (p *WGEBPFProxy) Free() error {
return nberrors.FormatErrorOrNil(result)
}
func (p *WGEBPFProxy) proxyToLocal(ctx context.Context, endpointPort uint16, remoteConn net.Conn) {
defer p.removeTurnConn(endpointPort)
var (
err error
n int
)
buf := make([]byte, 1500)
for ctx.Err() == nil {
n, err = remoteConn.Read(buf)
if err != nil {
if ctx.Err() != nil {
return
}
if err != io.EOF {
log.Errorf("failed to read from turn conn (endpoint: :%d): %s", endpointPort, err)
}
return
}
if err := p.sendPkg(buf[:n], endpointPort); err != nil {
if ctx.Err() != nil || p.ctx.Err() != nil {
return
}
log.Errorf("failed to write out turn pkg to local conn: %v", err)
}
}
}
// proxyToRemote read messages from local WireGuard interface and forward it to remote conn
// From this go routine has only one instance.
func (p *WGEBPFProxy) proxyToRemote() {
@ -280,7 +249,7 @@ func (p *WGEBPFProxy) prepareSenderRawSocket() (net.PacketConn, error) {
return packetConn, nil
}
func (p *WGEBPFProxy) sendPkg(data []byte, port uint16) error {
func (p *WGEBPFProxy) sendPkg(data []byte, port int) error {
localhost := net.ParseIP("127.0.0.1")
payload := gopacket.Payload(data)

102
client/internal/wgproxy/ebpf/wrapper.go
View File

@ -4,8 +4,13 @@ package ebpf
import (
"context"
"errors"
"fmt"
"io"
"net"
"sync"
log "github.com/sirupsen/logrus"
)
// ProxyWrapper help to keep the remoteConn instance for net.Conn.Close function call
@ -13,20 +18,55 @@ type ProxyWrapper struct {
WgeBPFProxy *WGEBPFProxy
remoteConn net.Conn
cancel context.CancelFunc // with thic cancel function, we stop remoteToLocal thread
ctx context.Context
cancel context.CancelFunc
wgEndpointAddr *net.UDPAddr
pausedMu sync.Mutex
paused bool
isStarted bool
}
func (e *ProxyWrapper) AddTurnConn(ctx context.Context, remoteConn net.Conn) (net.Addr, error) {
ctxConn, cancel := context.WithCancel(ctx)
addr, err := e.WgeBPFProxy.AddTurnConn(ctxConn, remoteConn)
func (p *ProxyWrapper) AddTurnConn(ctx context.Context, remoteConn net.Conn) error {
addr, err := p.WgeBPFProxy.AddTurnConn(remoteConn)
if err != nil {
cancel()
return nil, fmt.Errorf("add turn conn: %w", err)
return fmt.Errorf("add turn conn: %w", err)
}
e.remoteConn = remoteConn
e.cancel = cancel
return addr, err
p.remoteConn = remoteConn
p.ctx, p.cancel = context.WithCancel(ctx)
p.wgEndpointAddr = addr
return err
}
func (p *ProxyWrapper) EndpointAddr() *net.UDPAddr {
return p.wgEndpointAddr
}
func (p *ProxyWrapper) Work() {
if p.remoteConn == nil {
return
}
p.pausedMu.Lock()
p.paused = false
p.pausedMu.Unlock()
if !p.isStarted {
p.isStarted = true
go p.proxyToLocal(p.ctx)
}
}
func (p *ProxyWrapper) Pause() {
if p.remoteConn == nil {
return
}
log.Tracef("pause proxy reading from: %s", p.remoteConn.RemoteAddr())
p.pausedMu.Lock()
p.paused = true
p.pausedMu.Unlock()
}
// CloseConn close the remoteConn and automatically remove the conn instance from the map
@ -42,3 +82,45 @@ func (e *ProxyWrapper) CloseConn() error {
}
return nil
}
func (p *ProxyWrapper) proxyToLocal(ctx context.Context) {
defer p.WgeBPFProxy.removeTurnConn(uint16(p.wgEndpointAddr.Port))
buf := make([]byte, 1500)
for {
n, err := p.readFromRemote(ctx, buf)
if err != nil {
return
}
p.pausedMu.Lock()
if p.paused {
p.pausedMu.Unlock()
continue
}
err = p.WgeBPFProxy.sendPkg(buf[:n], p.wgEndpointAddr.Port)
p.pausedMu.Unlock()
if err != nil {
if ctx.Err() != nil {
return
}
log.Errorf("failed to write out turn pkg to local conn: %v", err)
}
}
}
func (p *ProxyWrapper) readFromRemote(ctx context.Context, buf []byte) (int, error) {
n, err := p.remoteConn.Read(buf)
if err != nil {
if ctx.Err() != nil {
return 0, ctx.Err()
}
if !errors.Is(err, io.EOF) {
log.Errorf("failed to read from turn conn (endpoint: :%d): %s", p.wgEndpointAddr.Port, err)
}
return 0, err
}
return n, nil
}

5
client/internal/wgproxy/proxy.go
View File

@ -7,6 +7,9 @@ import (
// Proxy is a transfer layer between the relayed connection and the WireGuard
type Proxy interface {
AddTurnConn(ctx context.Context, turnConn net.Conn) (net.Addr, error)
AddTurnConn(ctx context.Context, turnConn net.Conn) error
EndpointAddr() *net.UDPAddr
Work()
Pause()
CloseConn() error
}

2
client/internal/wgproxy/proxy_test.go
View File

@ -114,7 +114,7 @@ func TestProxyCloseByRemoteConn(t *testing.T) {
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
relayedConn := newMockConn()
_, err := tt.proxy.AddTurnConn(ctx, relayedConn)
err := tt.proxy.AddTurnConn(ctx, relayedConn)
if err != nil {
t.Errorf("error: %v", err)
}

93
client/internal/wgproxy/usp/proxy.go
View File

@ -15,13 +15,17 @@ import (
// WGUserSpaceProxy proxies
type WGUserSpaceProxy struct {
localWGListenPort int
ctx context.Context
cancel context.CancelFunc
remoteConn net.Conn
localConn net.Conn
ctx context.Context
cancel context.CancelFunc
closeMu sync.Mutex
closed bool
pausedMu sync.Mutex
paused bool
isStarted bool
}
// NewWGUserSpaceProxy instantiate a user space WireGuard proxy. This is not a thread safe implementation
@ -33,24 +37,60 @@ func NewWGUserSpaceProxy(wgPort int) *WGUserSpaceProxy {
return p
}
// AddTurnConn start the proxy with the given remote conn
func (p *WGUserSpaceProxy) AddTurnConn(ctx context.Context, remoteConn net.Conn) (net.Addr, error) {
p.ctx, p.cancel = context.WithCancel(ctx)
p.remoteConn = remoteConn
var err error
// AddTurnConn
// The provided Context must be non-nil. If the context expires before
// the connection is complete, an error is returned. Once successfully
// connected, any expiration of the context will not affect the
// connection.
func (p *WGUserSpaceProxy) AddTurnConn(ctx context.Context, remoteConn net.Conn) error {
dialer := net.Dialer{}
p.localConn, err = dialer.DialContext(p.ctx, "udp", fmt.Sprintf(":%d", p.localWGListenPort))
localConn, err := dialer.DialContext(ctx, "udp", fmt.Sprintf(":%d", p.localWGListenPort))
if err != nil {
log.Errorf("failed dialing to local Wireguard port %s", err)
return nil, err
return err
}
go p.proxyToRemote()
go p.proxyToLocal()
p.ctx, p.cancel = context.WithCancel(ctx)
p.localConn = localConn
p.remoteConn = remoteConn
return p.localConn.LocalAddr(), err
return err
}
func (p *WGUserSpaceProxy) EndpointAddr() *net.UDPAddr {
if p.localConn == nil {
return nil
}
endpointUdpAddr, _ := net.ResolveUDPAddr(p.localConn.LocalAddr().Network(), p.localConn.LocalAddr().String())
return endpointUdpAddr
}
// Work starts the proxy or resumes it if it was paused
func (p *WGUserSpaceProxy) Work() {
if p.remoteConn == nil {
return
}
p.pausedMu.Lock()
p.paused = false
p.pausedMu.Unlock()
if !p.isStarted {
p.isStarted = true
go p.proxyToRemote(p.ctx)
go p.proxyToLocal(p.ctx)
}
}
// Pause pauses the proxy from receiving data from the remote peer
func (p *WGUserSpaceProxy) Pause() {
if p.remoteConn == nil {
return
}
p.pausedMu.Lock()
p.paused = true
p.pausedMu.Unlock()
}
// CloseConn close the localConn
@ -85,7 +125,7 @@ func (p *WGUserSpaceProxy) close() error {
}
// proxyToRemote proxies from Wireguard to the RemoteKey
func (p *WGUserSpaceProxy) proxyToRemote() {
func (p *WGUserSpaceProxy) proxyToRemote(ctx context.Context) {
defer func() {
if err := p.close(); err != nil {
log.Warnf("error in proxy to remote loop: %s", err)
@ -93,10 +133,10 @@ func (p *WGUserSpaceProxy) proxyToRemote() {
}()
buf := make([]byte, 1500)
for p.ctx.Err() == nil {
for ctx.Err() == nil {
n, err := p.localConn.Read(buf)
if err != nil {
if p.ctx.Err() != nil {
if ctx.Err() != nil {
return
}
log.Debugf("failed to read from wg interface conn: %s", err)
@ -105,7 +145,7 @@ func (p *WGUserSpaceProxy) proxyToRemote() {
_, err = p.remoteConn.Write(buf[:n])
if err != nil {
if p.ctx.Err() != nil {
if ctx.Err() != nil {
return
}
@ -116,7 +156,8 @@ func (p *WGUserSpaceProxy) proxyToRemote() {
}
// proxyToLocal proxies from the Remote peer to local WireGuard
func (p *WGUserSpaceProxy) proxyToLocal() {
// if the proxy is paused it will drain the remote conn and drop the packets
func (p *WGUserSpaceProxy) proxyToLocal(ctx context.Context) {
defer func() {
if err := p.close(); err != nil {
log.Warnf("error in proxy to local loop: %s", err)
@ -124,19 +165,27 @@ func (p *WGUserSpaceProxy) proxyToLocal() {
}()
buf := make([]byte, 1500)
for p.ctx.Err() == nil {
for {
n, err := p.remoteConn.Read(buf)
if err != nil {
if p.ctx.Err() != nil {
if ctx.Err() != nil {
return
}
log.Errorf("failed to read from remote conn: %s, %s", p.remoteConn.RemoteAddr(), err)
return
}
p.pausedMu.Lock()
if p.paused {
p.pausedMu.Unlock()
continue
}
_, err = p.localConn.Write(buf[:n])
p.pausedMu.Unlock()
if err != nil {
if p.ctx.Err() != nil {
if ctx.Err() != nil {
return
}
log.Debugf("failed to write to wg interface conn: %s", err)