Xray-core/proxy/wireguard/tun.go

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package wireguard
import (
"context"
"errors"
"fmt"
"net"
"net/netip"
"runtime"
"strconv"
"strings"
"sync"
"time"
"github.com/xtls/xray-core/common/log"
xnet "github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/proxy/wireguard/gvisortun"
"gvisor.dev/gvisor/pkg/tcpip"
"gvisor.dev/gvisor/pkg/tcpip/adapters/gonet"
"gvisor.dev/gvisor/pkg/tcpip/transport/tcp"
"gvisor.dev/gvisor/pkg/tcpip/transport/udp"
"gvisor.dev/gvisor/pkg/waiter"
"golang.zx2c4.com/wireguard/conn"
"golang.zx2c4.com/wireguard/device"
"golang.zx2c4.com/wireguard/tun"
)
type tunCreator func(localAddresses []netip.Addr, mtu int, handler promiscuousModeHandler) (Tunnel, error)
type promiscuousModeHandler func(dest xnet.Destination, conn net.Conn)
type Tunnel interface {
BuildDevice(ipc string, bind conn.Bind) error
DialContextTCPAddrPort(ctx context.Context, addr netip.AddrPort) (net.Conn, error)
DialUDPAddrPort(laddr, raddr netip.AddrPort) (net.Conn, error)
Close() error
}
type tunnel struct {
tun tun.Device
device *device.Device
rw sync.Mutex
}
func (t *tunnel) BuildDevice(ipc string, bind conn.Bind) (err error) {
t.rw.Lock()
defer t.rw.Unlock()
if t.device != nil {
return errors.New("device is already initialized")
}
logger := &device.Logger{
Verbosef: func(format string, args ...any) {
log.Record(&log.GeneralMessage{
Severity: log.Severity_Debug,
Content: fmt.Sprintf(format, args...),
})
},
Errorf: func(format string, args ...any) {
log.Record(&log.GeneralMessage{
Severity: log.Severity_Error,
Content: fmt.Sprintf(format, args...),
})
},
}
t.device = device.NewDevice(t.tun, bind, logger)
if err = t.device.IpcSet(ipc); err != nil {
return err
}
if err = t.device.Up(); err != nil {
return err
}
return nil
}
func (t *tunnel) Close() (err error) {
t.rw.Lock()
defer t.rw.Unlock()
if t.device == nil {
return nil
}
t.device.Close()
t.device = nil
err = t.tun.Close()
t.tun = nil
return nil
}
func CalculateInterfaceName(name string) (tunName string) {
if runtime.GOOS == "darwin" {
tunName = "utun"
} else if name != "" {
tunName = name
} else {
tunName = "tun"
}
interfaces, err := net.Interfaces()
if err != nil {
return
}
var tunIndex int
for _, netInterface := range interfaces {
if strings.HasPrefix(netInterface.Name, tunName) {
index, parseErr := strconv.ParseInt(netInterface.Name[len(tunName):], 10, 16)
if parseErr == nil {
tunIndex = int(index) + 1
}
}
}
tunName = fmt.Sprintf("%s%d", tunName, tunIndex)
return
}
var _ Tunnel = (*gvisorNet)(nil)
type gvisorNet struct {
tunnel
net *gvisortun.Net
}
func (g *gvisorNet) Close() error {
return g.tunnel.Close()
}
func (g *gvisorNet) DialContextTCPAddrPort(ctx context.Context, addr netip.AddrPort) (
net.Conn, error,
) {
return g.net.DialContextTCPAddrPort(ctx, addr)
}
func (g *gvisorNet) DialUDPAddrPort(laddr, raddr netip.AddrPort) (net.Conn, error) {
return g.net.DialUDPAddrPort(laddr, raddr)
}
func createGVisorTun(localAddresses []netip.Addr, mtu int, handler promiscuousModeHandler) (Tunnel, error) {
out := &gvisorNet{}
tun, n, stack, err := gvisortun.CreateNetTUN(localAddresses, mtu, handler != nil)
if err != nil {
return nil, err
}
if handler != nil {
// handler is only used for promiscuous mode
// capture all packets and send to handler
tcpForwarder := tcp.NewForwarder(stack, 0, 65535, func(r *tcp.ForwarderRequest) {
go func(r *tcp.ForwarderRequest) {
var (
wq waiter.Queue
id = r.ID()
)
// Perform a TCP three-way handshake.
ep, err := r.CreateEndpoint(&wq)
if err != nil {
newError(err.String()).AtError().WriteToLog()
r.Complete(true)
return
}
r.Complete(false)
defer ep.Close()
// enable tcp keep-alive to prevent hanging connections
ep.SocketOptions().SetKeepAlive(true)
// local address is actually destination
handler(xnet.TCPDestination(xnet.IPAddress(id.LocalAddress.AsSlice()), xnet.Port(id.LocalPort)), gonet.NewTCPConn(&wq, ep))
}(r)
})
stack.SetTransportProtocolHandler(tcp.ProtocolNumber, tcpForwarder.HandlePacket)
udpForwarder := udp.NewForwarder(stack, func(r *udp.ForwarderRequest) {
go func(r *udp.ForwarderRequest) {
var (
wq waiter.Queue
id = r.ID()
)
ep, err := r.CreateEndpoint(&wq)
if err != nil {
newError(err.String()).AtError().WriteToLog()
return
}
defer ep.Close()
// prevents hanging connections and ensure timely release
ep.SocketOptions().SetLinger(tcpip.LingerOption{
Enabled: true,
Timeout: 15 * time.Second,
})
handler(xnet.UDPDestination(xnet.IPAddress(id.LocalAddress.AsSlice()), xnet.Port(id.LocalPort)), gonet.NewUDPConn(stack, &wq, ep))
}(r)
})
stack.SetTransportProtocolHandler(udp.ProtocolNumber, udpForwarder.HandlePacket)
}
out.tun, out.net = tun, n
return out, nil
}