Added logic to find next available IP address

configreader.go

@@ -0,0 +1,42 @@
+package main
+
+import (
+	"fmt"
+	"io/fs"
+	"net"
+	"path/filepath"
+	"strings"
+
+	"gopkg.in/ini.v1"
+)
+
+func parseUsedIPsFromConfigs(dir string) ([]net.IP, error) {
+	var usedIPs []net.IP
+
+	err := filepath.WalkDir(dir, func(path string, d fs.DirEntry, err error) error {
+		if err != nil || d.IsDir() || !strings.HasSuffix(d.Name(), ".conf") {
+			return nil
+		}
+
+		cfg, err := ini.Load(path)
+		if err != nil {
+			return fmt.Errorf("failed to parse config %s: %w", path, err)
+		}
+
+		// Check [Interface] section
+		if iface := cfg.Section("Interface"); iface != nil {
+			if addr := iface.Key("Address").String(); addr != "" {
+				ip := strings.Split(addr, "/")[0]
+				usedIPs = append(usedIPs, net.ParseIP(ip))
+			}
+		}
+
+		return nil
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	return usedIPs, nil
+}