From 7f5782cde59f2ea29dd28237c34f7a4bf55ea562 Mon Sep 17 00:00:00 2001
From: Markus Pesch <markus.pesch@cryptic.systems>
Date: Mon, 26 Apr 2021 09:56:38 +0200
Subject: [PATCH] fix: add default interface

---
 pkg/config/config.go | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/pkg/config/config.go b/pkg/config/config.go
index 8733099..1a6187a 100644
--- a/pkg/config/config.go
+++ b/pkg/config/config.go
@@ -71,6 +71,14 @@ func Read(cnfFile string) (*types.Config, error) {
 		return nil, fmt.Errorf("failed to decode json: %w", err)
 	}
 
+	if len(cnf.Ifaces) <= 0 {
+		defaultInterface, err := getDefaultInterfaceByIP()
+		if err != nil {
+			return nil, err
+		}
+		cnf.Ifaces = []string{defaultInterface.Name}
+	}
+
 	for _, iface := range cnf.Ifaces {
 		if _, err := net.InterfaceByName(iface); err != nil {
 			return nil, fmt.Errorf("unknown interface: %v", iface)