sing-box/outbound/wireguard.go

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//go:build with_wireguard
package outbound
import (
"context"
"encoding/base64"
"encoding/hex"
"fmt"
"net"
"strings"
"github.com/sagernet/sing-box/adapter"
"github.com/sagernet/sing-box/common/dialer"
C "github.com/sagernet/sing-box/constant"
"github.com/sagernet/sing-box/log"
"github.com/sagernet/sing-box/option"
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"github.com/sagernet/sing-box/transport/wireguard"
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"github.com/sagernet/sing-tun"
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"github.com/sagernet/sing/common"
"github.com/sagernet/sing/common/debug"
E "github.com/sagernet/sing/common/exceptions"
M "github.com/sagernet/sing/common/metadata"
N "github.com/sagernet/sing/common/network"
"github.com/sagernet/wireguard-go/device"
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)
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var (
_ adapter.Outbound = (*WireGuard)(nil)
_ adapter.InterfaceUpdateListener = (*WireGuard)(nil)
)
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type WireGuard struct {
myOutboundAdapter
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bind *wireguard.ClientBind
device *device.Device
tunDevice wireguard.Device
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}
func NewWireGuard(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, options option.WireGuardOutboundOptions) (*WireGuard, error) {
outbound := &WireGuard{
myOutboundAdapter: myOutboundAdapter{
protocol: C.TypeWireGuard,
network: options.Network.Build(),
router: router,
logger: logger,
tag: tag,
},
}
var reserved [3]uint8
if len(options.Reserved) > 0 {
if len(options.Reserved) != 3 {
return nil, E.New("invalid reserved value, required 3 bytes, got ", len(options.Reserved))
}
copy(reserved[:], options.Reserved)
}
var isConnect bool
var connectAddr M.Socksaddr
if len(options.Peers) < 2 {
isConnect = true
if len(options.Peers) == 1 {
connectAddr = options.Peers[0].ServerOptions.Build()
} else {
connectAddr = options.ServerOptions.Build()
}
}
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outbound.bind = wireguard.NewClientBind(ctx, outbound, dialer.New(router, options.DialerOptions), isConnect, connectAddr, reserved)
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localPrefixes := common.Map(options.LocalAddress, option.ListenPrefix.Build)
if len(localPrefixes) == 0 {
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return nil, E.New("missing local address")
}
var privateKey string
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{
bytes, err := base64.StdEncoding.DecodeString(options.PrivateKey)
if err != nil {
return nil, E.Cause(err, "decode private key")
}
privateKey = hex.EncodeToString(bytes)
}
ipcConf := "private_key=" + privateKey
if len(options.Peers) > 0 {
for i, peer := range options.Peers {
var peerPublicKey, preSharedKey string
{
bytes, err := base64.StdEncoding.DecodeString(peer.PublicKey)
if err != nil {
return nil, E.Cause(err, "decode public key for peer ", i)
}
peerPublicKey = hex.EncodeToString(bytes)
}
if peer.PreSharedKey != "" {
bytes, err := base64.StdEncoding.DecodeString(peer.PreSharedKey)
if err != nil {
return nil, E.Cause(err, "decode pre shared key for peer ", i)
}
preSharedKey = hex.EncodeToString(bytes)
}
destination := peer.ServerOptions.Build()
ipcConf += "\npublic_key=" + peerPublicKey
ipcConf += "\nendpoint=" + destination.String()
if preSharedKey != "" {
ipcConf += "\npreshared_key=" + preSharedKey
}
if len(peer.AllowedIPs) == 0 {
return nil, E.New("missing allowed_ips for peer ", i)
}
for _, allowedIP := range peer.AllowedIPs {
ipcConf += "\nallowed_ip=" + allowedIP
}
if len(peer.Reserved) > 0 {
if len(peer.Reserved) != 3 {
return nil, E.New("invalid reserved value for peer ", i, ", required 3 bytes, got ", len(peer.Reserved))
}
copy(reserved[:], options.Reserved)
outbound.bind.SetReservedForEndpoint(destination, reserved)
}
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}
} else {
var peerPublicKey, preSharedKey string
{
bytes, err := base64.StdEncoding.DecodeString(options.PeerPublicKey)
if err != nil {
return nil, E.Cause(err, "decode peer public key")
}
peerPublicKey = hex.EncodeToString(bytes)
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}
if options.PreSharedKey != "" {
bytes, err := base64.StdEncoding.DecodeString(options.PreSharedKey)
if err != nil {
return nil, E.Cause(err, "decode pre shared key")
}
preSharedKey = hex.EncodeToString(bytes)
}
ipcConf += "\npublic_key=" + peerPublicKey
ipcConf += "\nendpoint=" + options.ServerOptions.Build().String()
if preSharedKey != "" {
ipcConf += "\npreshared_key=" + preSharedKey
}
var has4, has6 bool
for _, address := range localPrefixes {
if address.Addr().Is4() {
has4 = true
} else {
has6 = true
}
}
if has4 {
ipcConf += "\nallowed_ip=0.0.0.0/0"
}
if has6 {
ipcConf += "\nallowed_ip=::/0"
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}
}
mtu := options.MTU
if mtu == 0 {
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mtu = 1408
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}
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var wireTunDevice wireguard.Device
var err error
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if !options.SystemInterface && tun.WithGVisor {
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wireTunDevice, err = wireguard.NewStackDevice(localPrefixes, mtu)
} else {
wireTunDevice, err = wireguard.NewSystemDevice(router, options.InterfaceName, localPrefixes, mtu)
}
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if err != nil {
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return nil, E.Cause(err, "create WireGuard device")
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}
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wgDevice := device.NewDevice(wireTunDevice, outbound.bind, &device.Logger{
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Verbosef: func(format string, args ...interface{}) {
logger.Debug(fmt.Sprintf(strings.ToLower(format), args...))
},
Errorf: func(format string, args ...interface{}) {
logger.Error(fmt.Sprintf(strings.ToLower(format), args...))
},
}, options.Workers)
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if debug.Enabled {
logger.Trace("created wireguard ipc conf: \n", ipcConf)
}
err = wgDevice.IpcSet(ipcConf)
if err != nil {
return nil, E.Cause(err, "setup wireguard")
}
outbound.device = wgDevice
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outbound.tunDevice = wireTunDevice
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return outbound, nil
}
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func (w *WireGuard) InterfaceUpdated() error {
w.bind.Reset()
return nil
}
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func (w *WireGuard) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
switch network {
case N.NetworkTCP:
w.logger.InfoContext(ctx, "outbound connection to ", destination)
case N.NetworkUDP:
w.logger.InfoContext(ctx, "outbound packet connection to ", destination)
}
if destination.IsFqdn() {
addrs, err := w.router.LookupDefault(ctx, destination.Fqdn)
if err != nil {
return nil, err
}
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return N.DialSerial(ctx, w.tunDevice, network, destination, addrs)
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}
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return w.tunDevice.DialContext(ctx, network, destination)
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}
func (w *WireGuard) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
w.logger.InfoContext(ctx, "outbound packet connection to ", destination)
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return w.tunDevice.ListenPacket(ctx, destination)
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}
func (w *WireGuard) NewConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
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return NewConnection(ctx, w, conn, metadata)
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}
func (w *WireGuard) NewPacketConnection(ctx context.Context, conn N.PacketConn, metadata adapter.InboundContext) error {
return NewPacketConnection(ctx, w, conn, metadata)
}
func (w *WireGuard) Start() error {
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return w.tunDevice.Start()
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}
func (w *WireGuard) Close() error {
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if w.device != nil {
w.device.Close()
}
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w.tunDevice.Close()
return nil
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}