sing-box/transport/wireguard/device_system.go
2023-08-20 13:31:48 +08:00

141 lines
3.1 KiB
Go

package wireguard
import (
"context"
"net"
"net/netip"
"os"
"github.com/sagernet/sing-box/adapter"
"github.com/sagernet/sing-box/common/dialer"
"github.com/sagernet/sing-box/option"
"github.com/sagernet/sing-tun"
"github.com/sagernet/sing/common"
M "github.com/sagernet/sing/common/metadata"
N "github.com/sagernet/sing/common/network"
wgTun "github.com/sagernet/wireguard-go/tun"
)
var _ Device = (*SystemDevice)(nil)
type SystemDevice struct {
dialer N.Dialer
device tun.Tun
name string
mtu int
events chan wgTun.Event
addr4 netip.Addr
addr6 netip.Addr
}
func NewSystemDevice(router adapter.Router, interfaceName string, localPrefixes []netip.Prefix, mtu uint32) (*SystemDevice, error) {
var inet4Addresses []netip.Prefix
var inet6Addresses []netip.Prefix
for _, prefixes := range localPrefixes {
if prefixes.Addr().Is4() {
inet4Addresses = append(inet4Addresses, prefixes)
} else {
inet6Addresses = append(inet6Addresses, prefixes)
}
}
if interfaceName == "" {
interfaceName = tun.CalculateInterfaceName("wg")
}
tunInterface, err := tun.New(tun.Options{
Name: interfaceName,
Inet4Address: inet4Addresses,
Inet6Address: inet6Addresses,
MTU: mtu,
})
if err != nil {
return nil, err
}
var inet4Address netip.Addr
var inet6Address netip.Addr
if len(inet4Addresses) > 0 {
inet4Address = inet4Addresses[0].Addr()
}
if len(inet6Addresses) > 0 {
inet6Address = inet6Addresses[0].Addr()
}
return &SystemDevice{
dialer: common.Must1(dialer.NewDefault(router, option.DialerOptions{
BindInterface: interfaceName,
})),
device: tunInterface,
name: interfaceName,
mtu: int(mtu),
events: make(chan wgTun.Event),
addr4: inet4Address,
addr6: inet6Address,
}, nil
}
func (w *SystemDevice) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
return w.dialer.DialContext(ctx, network, destination)
}
func (w *SystemDevice) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
return w.dialer.ListenPacket(ctx, destination)
}
func (w *SystemDevice) Inet4Address() netip.Addr {
return w.addr4
}
func (w *SystemDevice) Inet6Address() netip.Addr {
return w.addr6
}
func (w *SystemDevice) Start() error {
w.events <- wgTun.EventUp
return nil
}
func (w *SystemDevice) File() *os.File {
return nil
}
func (w *SystemDevice) Read(bufs [][]byte, sizes []int, offset int) (count int, err error) {
sizes[0], err = w.device.Read(bufs[0][offset-tun.PacketOffset:])
if err == nil {
count = 1
}
return
}
func (w *SystemDevice) Write(bufs [][]byte, offset int) (count int, err error) {
for _, b := range bufs {
_, err = w.device.Write(b[offset:])
if err != nil {
return
}
count++
}
return
}
func (w *SystemDevice) Flush() error {
return nil
}
func (w *SystemDevice) MTU() (int, error) {
return w.mtu, nil
}
func (w *SystemDevice) Name() (string, error) {
return w.name, nil
}
func (w *SystemDevice) Events() <-chan wgTun.Event {
return w.events
}
func (w *SystemDevice) Close() error {
return w.device.Close()
}
func (w *SystemDevice) BatchSize() int {
return 1
}