list interfaces

README.md

@@ -10,7 +10,7 @@ Realized features:
 - [ ] Rule composer
 - [ ] List loading/watching (temporary)
 - [X] IPSet integration
-- [ ] Listing of interfaces
+- [X] Listing of interfaces
 - [ ] IPTables rules to IPSet [2]
 - [ ] It is not a concept now... REFACTORING TIME!!!
 - [ ] HTTP API

kvas2.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"net"
 	"sync"
 	"time"
 
@@ -130,6 +131,25 @@ func (a *App) AppendGroup(group *models.Group) error {
 	return nil
 }
 
+func (a *App) ListInterfaces() ([]net.Interface, error) {
+	interfaceNames := make([]net.Interface, 0)
+
+	interfaces, err := net.Interfaces()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get interfaces: %w", err)
+	}
+
+	for _, iface := range interfaces {
+		if iface.Flags&net.FlagPointToPoint == 0 {
+			continue
+		}
+
+		interfaceNames = append(interfaceNames, iface)
+	}
+
+	return interfaceNames, nil
+}
+
 func (a *App) processARecord(aRecord dnsProxy.Address) {
 	ttlDuration := time.Duration(aRecord.TTL) * time.Second
 	if ttlDuration < a.Config.MinimalTTL {