Allow specifying external domain names to be routed through VPN

.gitignore

@@ -1,2 +1,3 @@
 routes.txt
+domains.txt
 run.sh

README.md

@@ -15,6 +15,7 @@ brew install vpn-slice
 brew install oath-toolkit
 brew install swiftbar
 brew install terminal-notifier
+brew install bind
 ```
 
 On Macos add server address, username, password and 2fa seed in keychain with these names:

domains.txt.sample

@@ -0,0 +1,2 @@
+www.example.com
+en.wikipedia.org

routing.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
 
 ROUTE_FILE=routes.txt
+DOMAIN_FILE=domains.txt
 
 VPN_SLICE=vpn-slice
 
@@ -50,12 +51,32 @@ if test -f "$ROUTE_FILE"; then
     echo "Loading subnets from $ROUTE_FILE"
     while read p; do
         case "$p" in \#*) continue ;; esac
+        if [ "$p" != "" ]; then
+            echo "Subnet: ${p}"
             add_subnet $p
+        fi
     done <$ROUTE_FILE
 
 else
     echo "$ROUTE_FILE does not exist. This should not happen."
 fi
 
+if test -f "$DOMAIN_FILE"; then
+    echo "Loading domains from $DOMAIN_FILE"
+    while read d; do
+        case "$d" in \#*) continue ;; esac
+        echo "Domain: ${d}"
+        if [ "$d" != "" ]; then
+            for p in `dig +short "$d" a | grep '^[.0-9]*$'`; do
+                echo "Resolved IP for domain ${d}: ${p}"
+                add_subnet $p/32
+            done
+        fi
+    done <$DOMAIN_FILE
+
+else
+    echo "$DOMAIN_FILE does not exist. Ignoring."
+fi
+
 # Load default script
 $VPN_SLICE -S