config: make sure that we're not iterating over empty interfaces

src/etc/inc/filter.inc

@@ -62,7 +62,7 @@ function is_bogonsv6_used() {
 	global $config, $g;
 	# Only use bogonsv6 table if IPv6 Allow is on, and at least 1 enabled interface also has "blockbogons" enabled.
 	$usebogonsv6 = false;
-	if (isset($config['system']['ipv6allow'])) {
+	if (isset($config['system']['ipv6allow']) && isset($config['interfaces'])) {
 		foreach ($config['interfaces'] as $ifacedata) {
 			if(isset($ifacedata['enable']) && isset($ifacedata['blockbogons'])) {
 				$usebogonsv6 = true;

src/etc/inc/util.inc

@@ -723,12 +723,16 @@ function get_configured_interface_list($only_opt = false, $withdisabled = false)
 	$iflist = array();
 
 	/* if list */
+	if (isset($config['interfaces'])) {
 		foreach($config['interfaces'] as $if => $ifdetail) {
-		if ($only_opt && ($if == "wan" || $if == "lan"))
+			if ($only_opt && ($if == "wan" || $if == "lan")) {
 				continue;
-		if (isset($ifdetail['enable']) || $withdisabled == true)
+			}
+			if (isset($ifdetail['enable']) || $withdisabled == true) {
 				$iflist[$if] = $if;
 			}
+		}
+	}
 
 	return $iflist;
 }
@@ -740,6 +744,7 @@ function get_configured_interface_list_by_realif($only_opt = false, $withdisable
 	$iflist = array();
 
 	/* if list */
+	if (isset($config['interfaces'])) {
 		foreach($config['interfaces'] as $if => $ifdetail) {
 			if ($only_opt && ($if == "wan" || $if == "lan"))
 				continue;
@@ -749,6 +754,7 @@ function get_configured_interface_list_by_realif($only_opt = false, $withdisable
 					$iflist[$tmpif] = $if;
 			}
 		}
+	}
 
 	return $iflist;
 }
@@ -760,6 +766,7 @@ function get_configured_interface_with_descr($only_opt = false, $withdisabled =
 	$iflist = array();
 
 	/* if list */
+	if (isset($config['interfaces'])) {
 		foreach($config['interfaces'] as $if => $ifdetail) {
 			if ($only_opt && ($if == "wan" || $if == "lan"))
 				continue;
@@ -770,6 +777,7 @@ function get_configured_interface_with_descr($only_opt = false, $withdisabled =
 					$iflist[$if] = strtoupper($ifdetail['descr']);
 			}
 		}
+	}
 
 	return $iflist;
 }
@@ -921,10 +929,11 @@ function get_interface_list($mode = "active", $keyby = "physical", $vfaces = "")
 					$toput['ipaddr'] = $aip[1];
 				}
 			}
-			if (is_array($config['interfaces'])) {
-				foreach($config['interfaces'] as $name => $int)
+			if (isset($config['interfaces'])) {
+				foreach($config['interfaces'] as $name => $int) {
 					if($int['if'] == $ifname) $friendly = $name;
 				}
+			}
 			switch($keyby) {
 			case "physical":
 				if($friendly != "") {
@@ -1410,7 +1419,7 @@ function is_interface_mismatch()
 	$do_assign = false;
 	$i = 0;
 
-	if (is_array($config['interfaces'])) {
+	if (isset($config['interfaces'])) {
 		foreach ($config['interfaces'] as $ifname => $ifcfg) {
 			if (preg_match("/^enc|^cua|^tun|^tap|^l2tp|^pptp|^ppp|^ovpn|^gif|^gre|^lagg|^bridge|vlan|_wlan/i", $ifcfg['if'])) {
 				/* Do not check these interfaces */

src/etc/rc.initial.banner

@@ -41,6 +41,12 @@ $machine = trim(`uname -m`);
 print "\n*** Welcome to {$product} {$version} ({$machine}) on {$hostname} ***\n";
 
 $iflist = get_configured_interface_with_descr(false, true);
+
+if (empty($iflist)) {
+	printf("\n\tNo network interfaces are assigned.\n");
+	return;
+}
+
 foreach($iflist as $ifname => $friendly) {
 	/* point to this interface's config */
 	$ifconf = $config['interfaces'][$ifname];