Improving Mac discovery

internal/clientinfo/arp_unix.go

@@ -0,0 +1,30 @@
+//go:build !linux && !windows
+
+package clientinfo
+
+import (
+	"os/exec"
+	"strings"
+)
+
+func (a *arpDiscover) scan() {
+	data, err := exec.Command("arp", "-an").Output()
+	if err != nil {
+		return
+	}
+
+	for _, line := range strings.Split(string(data), "\n") {
+		fields := strings.Fields(line)
+		if len(fields) <= 3 {
+			continue
+		}
+
+		// trim brackets
+		ip := strings.ReplaceAll(fields[1], "(", "")
+		ip = strings.ReplaceAll(ip, ")", "")
+
+		mac := fields[3]
+		a.mac.Store(ip, mac)
+		a.ip.Store(mac, ip)
+	}
+}