From 89c3926ba502e7e91afd001f4fbc1ec16b40cf67 Mon Sep 17 00:00:00 2001
From: Simon Zolin <s.zolin@adguard.com>
Date: Tue, 4 Aug 2020 14:18:35 +0300
Subject: [PATCH] * dhcp: fail on startup if couldn't initialize DHCP module

---
 dhcpd/dhcpd.go | 5 +++++
 home/home.go   | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/dhcpd/dhcpd.go b/dhcpd/dhcpd.go
index 11937eb1..f6e19d5a 100644
--- a/dhcpd/dhcpd.go
+++ b/dhcpd/dhcpd.go
@@ -119,6 +119,11 @@ func Create(config ServerConfig) *Server {
 		return nil
 	}
 
+	if s.conf.Enabled && !v4conf.Enabled && !v6conf.Enabled {
+		log.Error("Can't enable DHCP server because neither DHCPv4 nor DHCPv6 servers are configured")
+		return nil
+	}
+
 	// we can't delay database loading until DHCP server is started,
 	//  because we need static leases functionality available beforehand
 	s.dbLoad()
diff --git a/home/home.go b/home/home.go
index 4482b6b2..b9d7a760 100644
--- a/home/home.go
+++ b/home/home.go
@@ -221,6 +221,9 @@ func run(args options) {
 	config.DHCP.ConfigModified = onConfigModified
 	if runtime.GOOS != "windows" {
 		Context.dhcpServer = dhcpd.Create(config.DHCP)
+		if Context.dhcpServer == nil {
+			log.Fatalf("Can't initialize DHCP module")
+		}
 	}
 	Context.autoHosts.Init("")