Allow specifying multiple local subnets

README.md

@@ -53,7 +53,7 @@ services:
 
 ## Local Network
 
-If you wish to allow traffic to your local network, specify the subnet using the `LOCAL_SUBNET` environment variable:
+If you wish to allow traffic to your local network, specify the subnet(s) using the `LOCAL_SUBNETS` environment variable:
 
 ```bash
 docker run --name wireguard                                          \
@@ -61,7 +61,7 @@ docker run --name wireguard                                          \
     --cap-add SYS_MODULE                                             \
     --sysctl net.ipv4.conf.all.src_valid_mark=1                      \
     -v /path/to/conf/mullvad.conf:/etc/wireguard/mullvad.conf        \
-    -e LOCAL_SUBNET=10.0.0.0/8                                       \
+    -e LOCAL_SUBNETS=10.1.0.0/16,10.2.0.0/16,10.3.0.0/16             \
     jordanpotter/wireguard
 ```
 

entrypoint.sh

@@ -40,17 +40,23 @@ else
     echo "Skipping IPv6 kill switch setup since IPv6 interface was not found" >&2
 fi
 
-# Support LOCAL_NETWORK environment variable, which was replaced by LOCAL_SUBNET
-if [[ -z "$LOCAL_SUBNET" && "$LOCAL_NETWORK" ]]; then
-    LOCAL_SUBNET=$LOCAL_NETWORK
+# Support LOCAL_NETWORK environment variable, which was replaced by LOCAL_SUBNETS
+if [[ -z "$LOCAL_SUBNETS" && "$LOCAL_NETWORK" ]]; then
+    LOCAL_SUBNETS=$LOCAL_NETWORK
 fi
 
-if [[ "$LOCAL_SUBNET" ]]; then
-    echo "Allowing traffic to local subnet ${LOCAL_SUBNET}" >&2
-    ip route add $LOCAL_SUBNET via $default_route_ip
-    iptables -I OUTPUT -d $LOCAL_SUBNET -j ACCEPT
+# Support LOCAL_SUBNET environment variable, which was replaced by LOCAL_SUBNETS (plural)
+if [[ -z "$LOCAL_SUBNETS" && "$LOCAL_SUBNET" ]]; then
+    LOCAL_SUBNETS=$LOCAL_SUBNET
 fi
 
+for local_subnet in ${LOCAL_SUBNETS//,/$IFS}
+do
+    echo "Allowing traffic to local subnet ${local_subnet}" >&2
+    ip route add $local_subnet via $default_route_ip
+    iptables -I OUTPUT -d $local_subnet -j ACCEPT
+done
+
 shutdown () {
     wg-quick down $interface
     exit 0