130 lines
2.8 KiB
Go
130 lines
2.8 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, ipNet, 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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ComponentID: "tap0901",
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InterfaceName: cfg.Name,
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Network: cfg.Addr,
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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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cmd := fmt.Sprintf("netsh interface ip set address name=%s "+
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"source=static addr=%s mask=%s gateway=none",
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ifce.Name(), ip.String(), ipMask(ipNet.Mask))
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log.Log("[tun]", 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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err = fmt.Errorf("%s: %v", cmd, er)
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return
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}
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if err = addRoutes("tun", 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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ip, ipNet, 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.TAP,
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PlatformSpecificParams: water.PlatformSpecificParams{
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ComponentID: "tap0901",
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InterfaceName: cfg.Name,
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Network: cfg.Addr,
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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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cmd := fmt.Sprintf("netsh interface ip set address name=%s "+
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"source=static addr=%s mask=%s gateway=none",
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ifce.Name(), ip.String(), ipMask(ipNet.Mask))
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log.Log("[tap]", 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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err = fmt.Errorf("%s: %v", cmd, er)
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return
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}
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if err = addRoutes("tap", 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 addRoutes(ifType, ifName 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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deleteRoute(ifName, route)
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cmd := fmt.Sprintf("netsh interface ip add route prefix=%s interface=%s store=active",
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route, ifName)
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log.Logf("[%s] %s", ifType, 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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return fmt.Errorf("%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 deleteRoute(ifName string, route string) error {
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cmd := fmt.Sprintf("netsh interface ip delete route prefix=%s interface=%s store=active",
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route, ifName)
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args := strings.Split(cmd, " ")
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return exec.Command(args[0], args[1:]...).Run()
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}
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func ipMask(mask net.IPMask) string {
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return fmt.Sprintf("%d.%d.%d.%d", mask[0], mask[1], mask[2], mask[3])
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}
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