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relay.go
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relay.go
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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
// Package wggrpc provides a WireGuard over GRPC client and server implementation.
package wggrpc
import (
"context"
"errors"
"net/netip"
"time"
"go.uber.org/zap"
"golang.org/x/sync/errgroup"
"google.golang.org/grpc"
"google.golang.org/grpc/metadata"
pb "github.com/siderolabs/siderolink/api/siderolink"
"github.com/siderolabs/siderolink/internal/wait"
"github.com/siderolabs/siderolink/pkg/openclose"
"github.com/siderolabs/siderolink/pkg/wgtunnel/wgbind"
)
// PeerAddrKey is the key used to store the peer address in the grpc context.
const PeerAddrKey = "x-siderolink-ipv6-addr"
// NewRelayToHost creates a new [Relay].
func NewRelayToHost(host string, retryTimeout time.Duration, queues *wgbind.QueuePair, ourAddr netip.AddrPort, opts ...grpc.DialOption) (*Relay, error) {
switch {
case host == "":
return nil, errors.New("host must be non-empty")
case retryTimeout < time.Second:
return nil, errors.New("retry timeout must be at least 1 second")
case !ourAddr.IsValid():
return nil, errors.New("our address must be non-empty")
}
conn, err := grpc.Dial(host, opts...)
if err != nil {
return nil, err
}
return &Relay{
conn: conn,
retryTimeout: retryTimeout,
queues: queues,
ourAddr: ourAddr,
ownConn: true,
}, nil
}
// NewRelay creates a new [Relay].
func NewRelay(conn *grpc.ClientConn, retryTimeout time.Duration, queues *wgbind.QueuePair, ourAddr netip.AddrPort) *Relay {
switch {
case retryTimeout < time.Second:
panic(errors.New("retry timeout must be at least 1 second"))
case !ourAddr.IsValid():
panic(errors.New("our address must be non-empty"))
}
return &Relay{
conn: conn,
retryTimeout: retryTimeout,
queues: queues,
ourAddr: ourAddr,
}
}
// Relay is the client side of the WireGuard over GRPC relay.
//
//nolint:govet
type Relay struct {
conn *grpc.ClientConn
retryTimeout time.Duration
queues *wgbind.QueuePair
ourAddr netip.AddrPort
openClose openclose.OpenClose
ownConn bool
cancelFn context.CancelFunc
}
type clientWaitValue = wait.Value[pb.WireGuardOverGRPCService_CreateStreamClient]
// Run runs the [Relay]. It consumes and sends packets from|to the [*QueuePair].
func (r *Relay) Run(ctx context.Context, logger *zap.Logger) error {
ok, closeFn := r.openClose.Open(func() {
ctx, r.cancelFn = context.WithCancel(ctx)
})
if !ok {
return errors.New("relay already running/closed")
}
defer func() {
r.cancelFn()
closeFn()
}()
var (
wv clientWaitValue
remoteEp wait.Value[string]
)
eg, ctx := errgroup.WithContext(ctx)
ctx = metadata.NewOutgoingContext(ctx, metadata.Pairs(PeerAddrKey, r.ourAddr.String()))
eg.Go(func() error { return r.runToPeer(ctx, &wv, &remoteEp, logger) })
eg.Go(func() error { return r.runFromPeer(ctx, &wv, &remoteEp, logger) })
return eg.Wait()
}
// Close closes the [Relay].
func (r *Relay) Close() {
if r == nil {
return
}
r.openClose.RequestCloseWait(func() {
if r.cancelFn != nil {
r.cancelFn()
}
if r.ownConn {
r.conn.Close() //nolint:errcheck
}
})
}
// IsClosed returns true if the [Relay] is closed.
func (r *Relay) IsClosed() bool {
return r == nil || r.openClose.IsClosed()
}
func (r *Relay) runToPeer(ctx context.Context, wv *clientWaitValue, remoteEp *wait.Value[string], logger *zap.Logger) error {
for {
stream, ok := wv.TryGet()
if !ok {
remoteEp.Unset()
var err error
stream, err = pb.NewWireGuardOverGRPCServiceClient(r.conn).CreateStream(ctx)
if err != nil {
if errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded) {
return nil
}
if errors.Is(err, errPeerReplaced) || errors.Is(err, errPeerNotAllowed) {
return err
}
logger.Debug("client failed to create stream", zap.Error(err))
select {
case <-time.NewTimer(r.retryTimeout).C:
continue
case <-ctx.Done():
return nil
}
}
logger.Debug("client opened stream")
wv.Set(stream)
}
pop, err := r.queues.ToPeer.Pop(ctx)
if err != nil {
return nil //nolint:nilerr
}
if !ok {
remoteEp.Set(pop.Addr)
}
l := logger.With(zap.String("dst", pop.Addr), zap.Int("len", len(pop.Data)))
l.Debug("client sending packet to peer")
if err = stream.Send(&pb.PeerPacket{
Data: pop.Data,
}); err != nil {
if errors.Is(err, errPeerReplaced) || errors.Is(err, errPeerNotAllowed) {
return err
}
continue
}
logger.Debug("client sent packet to peer")
}
}
func (r *Relay) runFromPeer(ctx context.Context, wv *clientWaitValue, remoteEp *wait.Value[string], logger *zap.Logger) error {
for {
stream, err := wv.Get(ctx)
if err != nil {
return nil //nolint:nilerr
}
recv, err := stream.Recv()
if err != nil {
wv.Unset()
if errors.Is(err, errPeerReplaced) || errors.Is(err, errPeerNotAllowed) {
return err
}
continue
}
src, err := remoteEp.Get(ctx)
if err != nil {
return nil //nolint:nilerr
}
l := logger.With(zap.String("src", src), zap.Int("len", len(recv.Data)))
l.Debug("client got server message")
if err = r.queues.FromPeer.Push(ctx, wgbind.Packet{
Addr: src,
Data: recv.Data,
}); err != nil {
wv.Unset()
continue
}
l.Debug("client pushed server message")
}
}