From d8c8129889aa0d97ab4d50a5b9079dfe8e7209e3 Mon Sep 17 00:00:00 2001
From: Franco Fichtner <franco@opnsense.org>
Date: Sun, 10 May 2020 08:08:23 +0200
Subject: [PATCH] interfaces: refuse to run dhcp6c on unconfigured interfaces

LAN trackers use SIGHUP only so this is safe.
---
 src/etc/inc/interfaces.inc | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/etc/inc/interfaces.inc b/src/etc/inc/interfaces.inc
index 7e6742c30..a2e5d8f3e 100644
--- a/src/etc/inc/interfaces.inc
+++ b/src/etc/inc/interfaces.inc
@@ -3047,13 +3047,17 @@ function interface_dhcpv6_prepare($interface = 'wan', $wancfg, $linkdownevent =
 
     @file_put_contents('/var/etc/dhcp6c.conf', $dhcp6cconf);
 
-    $rtsoldscript = <<<EOD
+    $rtsold_script = <<<EOD
 #!/bin/sh
 # this file was auto-generated, do not edit
 if [ -z "\${1}" ]; then
     echo "Nothing to do."
     exit 0
 fi
+if [ ! -f "/var/etc/dhcp6c_\${1}.conf" ]; then
+    echo "No DHCPv6 configuration found for \${1}"
+    exit 0
+fi
 if [ -n "\${2}" ]; then
     echo \${2} > /tmp/\${1}_routerv6
     echo \${2} > /tmp/\${1}_defaultgwv6
@@ -3073,7 +3077,7 @@ fi
 
 EOD;
 
-    @file_put_contents('/var/etc/rtsold_script.sh', $rtsoldscript);
+    @file_put_contents('/var/etc/rtsold_script.sh', $rtsold_script);
     @chmod('/var/etc/rtsold_script.sh', 0755);
 }