38 lines
648 B
Go
38 lines
648 B
Go
//go:build !linux
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// +build !linux
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// ^ Linux isn't Unix anyway :P
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package arp
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import (
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"net"
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"os/exec"
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"strings"
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)
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func lookup() (map[string]net.HardwareAddr, error) {
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data, err := exec.Command("arp", "-an").Output()
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if err != nil {
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return nil, err
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}
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t := make(map[string]net.HardwareAddr)
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for _, line := range strings.Split(string(data), "\n") {
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fields := strings.Fields(line)
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if len(fields) < 3 {
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continue
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}
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// strip brackets around IP
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ip := strings.ReplaceAll(fields[1], "(", "")
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ip = strings.ReplaceAll(ip, ")", "")
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if mac, err := net.ParseMAC(fields[3]); err == nil {
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t[ip] = mac
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}
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}
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return t, nil
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}
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