63 lines
1020 B
Go
63 lines
1020 B
Go
//go:build darwin
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package tendrils
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import (
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"bufio"
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"log"
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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 (t *Tendrils) parseARPTable() []arpEntry {
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cmd := exec.Command("arp", "-an")
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output, err := cmd.Output()
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if err != nil {
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return nil
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}
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var entries []arpEntry
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scanner := bufio.NewScanner(strings.NewReader(string(output)))
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for scanner.Scan() {
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line := scanner.Text()
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if strings.Contains(line, "permanent") {
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continue
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}
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fields := strings.Fields(line)
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if len(fields) < 6 {
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continue
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}
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ipStr := strings.Trim(fields[1], "()")
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ip := net.ParseIP(ipStr)
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if ip == nil {
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continue
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}
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macStr := fields[3]
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if macStr == "(incomplete)" {
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continue
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}
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macStr = normalizeMACAddress(macStr)
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mac, err := net.ParseMAC(macStr)
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if err != nil {
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log.Printf("[ERROR] [arp] failed to parse MAC %q for IP %s: %v", macStr, ipStr, err)
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continue
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}
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ifaceName := fields[5]
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entries = append(entries, arpEntry{
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ip: ip,
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mac: mac,
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iface: ifaceName,
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})
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}
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return entries
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}
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