14.04.2026 Update

handlers/overlap.go

@@ -0,0 +1,172 @@
+package handlers
+
+import (
+	"nano-router/config"
+	"nano-router/dhcp"
+	"nano-router/network"
+	"net/http"
+	"strings"
+)
+
+func collectAllSubnets(excludeIface string) []network.SubnetOverlap {
+	var result []network.SubnetOverlap
+
+	appCfg, _ := config.Load()
+	if appCfg != nil {
+		for name, ic := range appCfg.Interfaces {
+			if name == excludeIface {
+				continue
+			}
+			addr, mask := resolveIfaceIP(name, ic.Mode, ic.Address, ic.Netmask)
+			if addr != "" && mask != "" {
+				result = append(result, network.SubnetOverlap{
+					Interface: name,
+					Label:     ic.Label,
+					Subnet:    addr + "/" + mask,
+				})
+			}
+		}
+	}
+
+	for name, pcfg := range network.GetAllPending() {
+		if name == excludeIface {
+			continue
+		}
+		addr, mask := resolveIfaceIP(name, pcfg.Mode, pcfg.Address, pcfg.Netmask)
+		if addr != "" && mask != "" {
+			result = append(result, network.SubnetOverlap{
+				Interface: name,
+				Label:     pcfg.Label,
+				Subnet:    addr + "/" + mask,
+			})
+		}
+	}
+
+	names, _ := network.GetInterfaces()
+	for _, name := range names {
+		if name == excludeIface {
+			continue
+		}
+		s, err := network.GetInterfaceStats(name)
+		if err != nil || s.IPv4 == "" || s.IPv4Mask == "" {
+			continue
+		}
+		var mode string
+		if appCfg != nil && appCfg.Interfaces != nil {
+			if ic, ok := appCfg.Interfaces[name]; ok {
+				mode = ic.Mode
+			}
+		}
+		if mode == "dhcp" {
+			result = append(result, network.SubnetOverlap{
+				Interface: name,
+				Subnet:    s.IPv4 + "/" + s.IPv4Mask,
+			})
+		}
+	}
+
+	if appCfg != nil {
+		for _, pool := range appCfg.DHCP.Pools {
+			if pool.Interface == excludeIface {
+				continue
+			}
+			if pool.Subnet != "" && pool.Netmask != "" {
+				result = append(result, network.SubnetOverlap{
+					Interface: pool.Interface,
+					Subnet:    pool.Subnet + "/" + pool.Netmask,
+				})
+			}
+		}
+	}
+
+	return result
+}
+
+func resolveIfaceIP(name, mode, addr, mask string) (string, string) {
+	if mode == "static" && addr != "" && mask != "" {
+		return addr, mask
+	}
+	if mode == "dhcp" {
+		s, err := network.GetInterfaceStats(name)
+		if err != nil {
+			return "", ""
+		}
+		if s.IPv4 != "" && s.IPv4Mask != "" {
+			return s.IPv4, s.IPv4Mask
+		}
+	}
+	return "", ""
+}
+
+func collectAllSubnetsForDHCP(excludeIface string) []network.SubnetOverlap {
+	result := collectAllSubnets(excludeIface)
+
+	cfg, _ := dhcp.Load()
+	if cfg != nil {
+		for _, pool := range cfg.Pools {
+			if pool.Interface == excludeIface {
+				continue
+			}
+			if pool.Subnet != "" && pool.Netmask != "" {
+				result = append(result, network.SubnetOverlap{
+					Interface: pool.Interface,
+					Subnet:    pool.Subnet + "/" + pool.Netmask,
+				})
+			}
+		}
+	}
+
+	return result
+}
+
+func checkInterfaceOverlap(cfg *network.InterfaceConfig) (string, bool) {
+	if cfg.Mode != "static" || cfg.Address == "" || cfg.Netmask == "" {
+		return "", false
+	}
+
+	all := collectAllSubnets(cfg.Name)
+	overlaps := network.CheckOverlap(cfg.Address, cfg.Netmask, cfg.Name, all)
+	if len(overlaps) > 0 {
+		var names []string
+		for _, o := range overlaps {
+			label := o.Interface
+			if o.Label != "" {
+				label = o.Label + " (" + o.Interface + ")"
+			}
+			names = append(names, label)
+		}
+		return "IP-адрес пересекается с подсетью интерфейса " + strings.Join(names, ", "), true
+	}
+	return "", false
+}
+
+func checkDHCPPoolOverlap(subnet, mask, iface string) (string, bool) {
+	if subnet == "" || mask == "" {
+		return "", false
+	}
+
+	all := collectAllSubnetsForDHCP(iface)
+	overlaps := network.CheckOverlap(subnet, mask, iface, all)
+	if len(overlaps) > 0 {
+		var names []string
+		for _, o := range overlaps {
+			label := o.Interface
+			if o.Label != "" {
+				label = o.Label + " (" + o.Interface + ")"
+			}
+			names = append(names, label)
+		}
+		return "Подсеть пересекается с " + strings.Join(names, ", "), true
+	}
+	return "", false
+}
+
+func HandleSubnets(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodGet {
+		fail(w, http.StatusMethodNotAllowed, "method not allowed")
+		return
+	}
+	exclude := r.URL.Query().Get("exclude")
+	result := collectAllSubnets(exclude)
+	ok(w, result)
+}