Refactor stations discovery and add hostapd discovery

internal/station/arp/parser.go

@@ -0,0 +1,64 @@
+package arp
+
+import (
+	"fmt"
+	"net"
+	"os"
+	"strings"
+)
+
+// ARPEntry represents an entry in the ARP table
+type ARPEntry struct {
+	IP        net.IP
+	HWType    int
+	Flags     int
+	HWAddress net.HardwareAddr
+	Mask      string
+	Device    string
+}
+
+// parseARPTable reads and parses ARP table from /proc/net/arp format
+func parseARPTable(path string) ([]ARPEntry, error) {
+	var entries []ARPEntry
+
+	content, err := os.ReadFile(path)
+	if err != nil {
+		return entries, err
+	}
+
+	for _, line := range strings.Split(string(content), "\n") {
+		fields := strings.Fields(line)
+		if len(fields) > 5 {
+			var entry ARPEntry
+
+			// Parse HWType (hex format)
+			if _, err := fmt.Sscanf(fields[1], "0x%x", &entry.HWType); err != nil {
+				continue
+			}
+
+			// Parse Flags (hex format)
+			if _, err := fmt.Sscanf(fields[2], "0x%x", &entry.Flags); err != nil {
+				continue
+			}
+
+			// Parse IP address
+			entry.IP = net.ParseIP(fields[0])
+			if entry.IP == nil {
+				continue
+			}
+
+			// Parse MAC address
+			entry.HWAddress, err = net.ParseMAC(fields[3])
+			if err != nil {
+				continue
+			}
+
+			entry.Mask = fields[4]
+			entry.Device = fields[5]
+
+			entries = append(entries, entry)
+		}
+	}
+
+	return entries, nil
+}