75 lines
1.4 KiB
Go
75 lines
1.4 KiB
Go
package gost
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import (
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"errors"
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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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})
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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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cmd := fmt.Sprintf("ifconfig %s inet %s mtu %d up", ifce.Name(), cfg.Addr, mtu)
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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(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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err = errors.New("tap is not supported on darwin")
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return
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}
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func addRoutes(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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cmd := fmt.Sprintf("route add -net %s -interface %s", route, ifName)
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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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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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