fix: dnsmasq answers the remote access clients' DNS queries, so they no longer get the router's own host name with all its addresses from systemd-resolved.

debian-package/src/usr/lib/vpn-router/setup

@@ -81,6 +81,9 @@ CADDY_PKI_DIR = pathlib.Path('/etc/caddy/vpn-router-pki')
 #: The certificates and keys of the sites of tls file, <site>/cert.pem and key.pem.
 CADDY_SITES_DIR = pathlib.Path('/etc/caddy/vpn-router-sites')
 
+#: The unit of dnsmasq, the resolver of the remote access clients.
+RESOLVER_UNIT = 'vpn-router-resolver.service'
+
 #: The unit of rclone's WebDAV server of the sites' folders.
 WEBDAV_UNIT = 'vpn-router-webdav.service'
 
@@ -676,6 +679,19 @@ def caddy_address(host, port, tls):
     return f'{"http://" if tls == "none" else ""}{host}:{port}'
 
 
+def manage_resolver(changed):
+    """Run dnsmasq, the resolver of the remote access clients, while configure wrote its configuration, restarting it when
+    that changed, and stop it when not. It starts after systemd-resolved has left the addresses it takes."""
+    if not vpnrouter.RESOLVER_CONF.exists():
+        if unit_is_active(RESOLVER_UNIT):
+            run(['systemctl', 'disable', '--now', RESOLVER_UNIT], check=False)
+        return
+    if not unit_is_active(RESOLVER_UNIT):
+        run(['systemctl', 'enable', '--now', RESOLVER_UNIT], check=False)
+    elif 'resolver' in changed:
+        run(['systemctl', 'restart', RESOLVER_UNIT], check=False)
+
+
 def manage_caddy(cfg, ctx):
     """Run Caddy, the HTTPS proxy of the router's services and the server of the web sites, while either is wanted, and
     stop it when not.
@@ -1062,6 +1078,8 @@ def main():
     if 'resolved' in changed:
         progress('running', 'resolver')
         run(['systemctl', 'restart', 'systemd-resolved'], check=False)
+    progress('running', 'resolver of the remote access clients')
+    manage_resolver(changed)
 
     progress('running', 'platform module')
     run_platform_setup(cfg, ctx)