syncthing/vendor/github.com/jackpal/gateway/gateway_linux.go

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package gateway
import (
"net"
"os/exec"
)
func DiscoverGateway() (ip net.IP, err error) {
ip, err = discoverGatewayUsingRoute()
if err != nil {
ip, err = discoverGatewayUsingIp()
}
return
}
func discoverGatewayUsingIp() (net.IP, error) {
routeCmd := exec.Command("/usr/bin/ip", "route", "show")
output, err := routeCmd.CombinedOutput()
if err != nil {
return nil, err
}
return parseLinuxIPRoute(output)
}
func discoverGatewayUsingRoute() (net.IP, error) {
routeCmd := exec.Command("/usr/bin/route", "-n")
output, err := routeCmd.CombinedOutput()
if err != nil {
return nil, err
}
return parseLinuxRoute(output)
}