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41 lines
793 B
Go
41 lines
793 B
Go
package gateway
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import (
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"bytes"
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"io/ioutil"
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"net"
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"os/exec"
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)
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func DiscoverGateway() (ip net.IP, err error) {
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routeCmd := exec.Command("/sbin/route", "-n", "get", "0.0.0.0")
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stdOut, err := routeCmd.StdoutPipe()
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if err != nil {
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return
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}
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if err = routeCmd.Start(); err != nil {
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return
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}
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output, err := ioutil.ReadAll(stdOut)
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if err != nil {
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return
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}
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// Darwin route out format is always like this:
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// route to: default
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// destination: default
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// mask: default
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// gateway: 192.168.1.1
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outputLines := bytes.Split(output, []byte("\n"))
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for _, line := range outputLines {
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if bytes.Contains(line, []byte("gateway:")) {
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gatewayFields := bytes.Fields(line)
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ip = net.ParseIP(string(gatewayFields[1]))
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break
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}
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}
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err = routeCmd.Wait()
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return
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}
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