tunnel: auto-detect IPv6/IPv4 preference

Detect IP address change.
Request non-VPN network.
Update endpoint when needed.
Unregister network on wgTurnOff and use IPv4 if network is not known.

1 files changed, 11 insertions, 2 deletions

diff --git a/tunnel/src/main/java/com/wireguard/config/Peer.java b/tunnel/src/main/java/com/wireguard/config/Peer.java
index 9b87b397..3cf5dc15 100644
--- a/tunnel/src/main/java/com/wireguard/config/Peer.java
+++ b/tunnel/src/main/java/com/wireguard/config/Peer.java
@@ -11,6 +11,7 @@ import com.wireguard.config.BadConfigException.Section;
 import com.wireguard.crypto.Key;
 import com.wireguard.crypto.KeyFormatException;
 import com.wireguard.util.NonNullForAll;
+import com.wireguard.util.Resolver;
 
 import java.util.Collection;
 import java.util.Collections;
@@ -190,18 +191,26 @@ public final class Peer {
      *
      * @return the {@code Peer} represented as a series of "key=value" lines
      */
-    public String toWgUserspaceString() {
+    public String toWgUserspaceString(Resolver resolver) {
         final StringBuilder sb = new StringBuilder();
         // The order here is important: public_key signifies the beginning of a new peer.
         sb.append("public_key=").append(publicKey.toHex()).append('\n');
         for (final InetNetwork allowedIp : allowedIps)
             sb.append("allowed_ip=").append(allowedIp).append('\n');
-        endpoint.flatMap(InetEndpoint::getResolved).ifPresent(ep -> sb.append("endpoint=").append(ep).append('\n'));
+        endpoint.flatMap(ep -> ep.getResolved(resolver)).ifPresent(ep -> sb.append("endpoint=").append(ep).append('\n'));
         persistentKeepalive.ifPresent(pk -> sb.append("persistent_keepalive_interval=").append(pk).append('\n'));
         preSharedKey.ifPresent(psk -> sb.append("preshared_key=").append(psk.toHex()).append('\n'));
         return sb.toString();
     }
 
+    public String toWgUserspaceStringWithChangedEndpoint(Resolver resolver) {
+        final StringBuilder sb = new StringBuilder();
+        // The order here is important: public_key signifies the beginning of a new peer.
+        sb.append("public_key=").append(publicKey.toHex()).append('\n');
+        endpoint.flatMap(ep -> ep.getResolved(resolver, true)).ifPresent(ep -> sb.append("endpoint=").append(ep).append('\n'));
+        return sb.toString();
+    }
+
     @SuppressWarnings("UnusedReturnValue")
     public static final class Builder {
         // See wg(8)