158 lines
3.0 KiB
Go
158 lines
3.0 KiB
Go
package gost
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import (
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"fmt"
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"net"
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"os/exec"
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"strings"
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"github.com/go-log/log"
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"github.com/songgao/water"
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)
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func createTun(cfg TunConfig) (conn net.Conn, itf *net.Interface, err error) {
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ip, _, err := net.ParseCIDR(cfg.Addr)
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if err != nil {
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return
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}
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ifce, err := water.New(water.Config{
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DeviceType: water.TUN,
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PlatformSpecificParams: water.PlatformSpecificParams{
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Name: cfg.Name,
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},
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})
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if err != nil {
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return
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}
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mtu := cfg.MTU
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if mtu <= 0 {
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mtu = DefaultMTU
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}
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if err = exeCmd(fmt.Sprintf("ip link set dev %s mtu %d", ifce.Name(), mtu)); err != nil {
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log.Log(err)
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}
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if err = exeCmd(fmt.Sprintf("ip address add %s dev %s", cfg.Addr, ifce.Name())); err != nil {
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log.Log(err)
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}
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if err = exeCmd(fmt.Sprintf("ip link set dev %s up", ifce.Name())); err != nil {
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log.Log(err)
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}
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if err = addTunRoutes(ifce.Name(), cfg.Routes...); err != nil {
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return
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}
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itf, err = net.InterfaceByName(ifce.Name())
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if err != nil {
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return
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}
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conn = &tunTapConn{
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ifce: ifce,
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addr: &net.IPAddr{IP: ip},
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}
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return
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}
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func createTap(cfg TapConfig) (conn net.Conn, itf *net.Interface, err error) {
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var ip net.IP
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if cfg.Addr != "" {
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ip, _, err = net.ParseCIDR(cfg.Addr)
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if err != nil {
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return
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}
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}
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ifce, err := water.New(water.Config{
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DeviceType: water.TAP,
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PlatformSpecificParams: water.PlatformSpecificParams{
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Name: cfg.Name,
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},
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})
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if err != nil {
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return
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}
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mtu := cfg.MTU
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if mtu <= 0 {
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mtu = DefaultMTU
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}
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if err = exeCmd(fmt.Sprintf("ip link set dev %s mtu %d", ifce.Name(), mtu)); err != nil {
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log.Log(err)
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}
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if cfg.Addr != "" {
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if err = exeCmd(fmt.Sprintf("ip address add %s dev %s", cfg.Addr, ifce.Name())); err != nil {
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log.Log(err)
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}
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}
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if err = exeCmd(fmt.Sprintf("ip link set dev %s up", ifce.Name())); err != nil {
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log.Log(err)
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}
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if err = addTapRoutes(ifce.Name(), cfg.Gateway, cfg.Routes...); err != nil {
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return
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}
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itf, err = net.InterfaceByName(ifce.Name())
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if err != nil {
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return
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}
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conn = &tunTapConn{
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ifce: ifce,
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addr: &net.IPAddr{IP: ip},
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}
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return
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}
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func addTunRoutes(ifName string, routes ...IPRoute) error {
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for _, route := range routes {
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if route.Dest == nil {
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continue
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}
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cmd := fmt.Sprintf("ip route add %s dev %s", route.Dest.String(), ifName)
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log.Logf("[tun] %s", cmd)
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args := strings.Split(cmd, " ")
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if er := exec.Command(args[0], args[1:]...).Run(); er != nil {
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log.Logf("[tun] %s: %v", cmd, er)
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}
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}
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return nil
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}
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func addTapRoutes(ifName string, gw string, routes ...string) error {
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for _, route := range routes {
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if route == "" {
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continue
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}
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cmd := fmt.Sprintf("ip route add %s via %s dev %s", route, gw, ifName)
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log.Logf("[tap] %s", cmd)
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args := strings.Split(cmd, " ")
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if er := exec.Command(args[0], args[1:]...).Run(); er != nil {
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log.Logf("[tap] %s: %v", cmd, er)
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}
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}
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return nil
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}
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func exeCmd(cmd string) error {
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log.Log(cmd)
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args := strings.Split(cmd, " ")
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if err := exec.Command(args[0], args[1:]...).Run(); err != nil {
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return fmt.Errorf("%s: %v", cmd, err)
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}
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return nil
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}
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