netbird/client/internal/wgproxy/usp/proxy.go

147 lines
3.1 KiB
Go
Raw Normal View History

package usp
import (
"context"
"fmt"
"net"
"sync"
"github.com/hashicorp/go-multierror"
log "github.com/sirupsen/logrus"
"github.com/netbirdio/netbird/client/errors"
)
// WGUserSpaceProxy proxies
type WGUserSpaceProxy struct {
localWGListenPort int
ctx context.Context
cancel context.CancelFunc
remoteConn net.Conn
localConn net.Conn
closeMu sync.Mutex
closed bool
}
// NewWGUserSpaceProxy instantiate a user space WireGuard proxy. This is not a thread safe implementation
func NewWGUserSpaceProxy(wgPort int) *WGUserSpaceProxy {
log.Debugf("Initializing new user space proxy with port %d", wgPort)
p := &WGUserSpaceProxy{
localWGListenPort: wgPort,
}
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
dialer := net.Dialer{}
p.localConn, err = dialer.DialContext(p.ctx, "udp", fmt.Sprintf(":%d", p.localWGListenPort))
if err != nil {
log.Errorf("failed dialing to local Wireguard port %s", err)
return nil, err
}
go p.proxyToRemote()
go p.proxyToLocal()
return p.localConn.LocalAddr(), err
}
// CloseConn close the localConn
func (p *WGUserSpaceProxy) CloseConn() error {
if p.cancel == nil {
return fmt.Errorf("proxy not started")
}
return p.close()
}
func (p *WGUserSpaceProxy) close() error {
p.closeMu.Lock()
defer p.closeMu.Unlock()
// prevent double close
if p.closed {
return nil
}
p.closed = true
p.cancel()
var result *multierror.Error
if err := p.remoteConn.Close(); err != nil {
result = multierror.Append(result, fmt.Errorf("remote conn: %s", err))
}
if err := p.localConn.Close(); err != nil {
result = multierror.Append(result, fmt.Errorf("local conn: %s", err))
}
return errors.FormatErrorOrNil(result)
}
// proxyToRemote proxies from Wireguard to the RemoteKey
func (p *WGUserSpaceProxy) proxyToRemote() {
defer func() {
if err := p.close(); err != nil {
log.Warnf("error in proxy to remote loop: %s", err)
}
}()
buf := make([]byte, 1500)
for p.ctx.Err() == nil {
n, err := p.localConn.Read(buf)
if err != nil {
if p.ctx.Err() != nil {
return
}
log.Debugf("failed to read from wg interface conn: %s", err)
return
}
_, err = p.remoteConn.Write(buf[:n])
if err != nil {
if p.ctx.Err() != nil {
return
}
log.Debugf("failed to write to remote conn: %s", err)
return
}
}
}
// proxyToLocal proxies from the Remote peer to local WireGuard
func (p *WGUserSpaceProxy) proxyToLocal() {
defer func() {
if err := p.close(); err != nil {
log.Warnf("error in proxy to local loop: %s", err)
}
}()
buf := make([]byte, 1500)
for p.ctx.Err() == nil {
n, err := p.remoteConn.Read(buf)
if err != nil {
if p.ctx.Err() != nil {
return
}
log.Errorf("failed to read from remote conn: %s, %s", p.remoteConn.RemoteAddr(), err)
return
}
_, err = p.localConn.Write(buf[:n])
if err != nil {
if p.ctx.Err() != nil {
return
}
log.Debugf("failed to write to wg interface conn: %s", err)
continue
}
}
}