Refactor stations discovery and add hostapd discovery

internal/station/dhcp/parser.go

@@ -0,0 +1,72 @@
+package dhcp
+
+import (
+	"bufio"
+	"os"
+	"os/exec"
+	"regexp"
+	"strings"
+
+	"github.com/nemunaire/repeater/internal/models"
+)
+
+// parseDHCPLeases reads and parses DHCP lease file
+func parseDHCPLeases(path string) ([]models.DHCPLease, error) {
+	var leases []models.DHCPLease
+
+	file, err := os.Open(path)
+	if err != nil {
+		return leases, err
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	var currentLease models.DHCPLease
+
+	for scanner.Scan() {
+		line := strings.TrimSpace(scanner.Text())
+
+		if strings.HasPrefix(line, "lease ") {
+			ip := strings.Fields(line)[1]
+			currentLease = models.DHCPLease{IP: ip}
+		} else if strings.Contains(line, "hardware ethernet") {
+			mac := strings.Fields(line)[2]
+			mac = strings.TrimSuffix(mac, ";")
+			currentLease.MAC = mac
+		} else if strings.Contains(line, "client-hostname") {
+			hostname := strings.Fields(line)[1]
+			hostname = strings.Trim(hostname, `";`)
+			currentLease.Hostname = hostname
+		} else if line == "}" {
+			if currentLease.IP != "" && currentLease.MAC != "" {
+				leases = append(leases, currentLease)
+			}
+			currentLease = models.DHCPLease{}
+		}
+	}
+
+	return leases, nil
+}
+
+// getARPInfo retrieves ARP table information using arp command
+// Returns a map of IP -> MAC address
+func getARPInfo() (map[string]string, error) {
+	arpInfo := make(map[string]string)
+
+	cmd := exec.Command("arp", "-a")
+	output, err := cmd.Output()
+	if err != nil {
+		return arpInfo, err
+	}
+
+	lines := strings.Split(string(output), "\n")
+	for _, line := range lines {
+		if matches := regexp.MustCompile(`\(([^)]+)\) at ([0-9a-fA-F:]{17})`).FindStringSubmatch(line); len(matches) > 2 {
+			ip := matches[1]
+			mac := matches[2]
+			arpInfo[ip] = mac
+		}
+	}
+
+	return arpInfo, nil
+}