1 files changed, 50 insertions, 0 deletions
diff --git a/src/migration-scripts/dns-forwarding/0-to-1 b/src/migration-scripts/dns-forwarding/0-to-1
new file mode 100755
index 000000000..6e8720eef
--- /dev/null
+++ b/src/migration-scripts/dns-forwarding/0-to-1
@@ -0,0 +1,50 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2019 VyOS maintainers and contributors
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 or later as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+# This migration script will check if there is a allow-from directive configured
+# for the dns forwarding service - if not, the node will be created with the old
+# default values of 0.0.0.0/0 and ::/0
+
+import sys
+from vyos.configtree import ConfigTree
+
+if (len(sys.argv) < 1):
+    print("Must specify file name!")
+    sys.exit(1)
+
+file_name = sys.argv[1]
+
+with open(file_name, 'r') as f:
+    config_file = f.read()
+
+config = ConfigTree(config_file)
+
+base = ['service', 'dns', 'forwarding']
+if not config.exists(base):
+    # Nothing to do
+    sys.exit(0)
+else:
+    if not config.exists(base + ['allow-from']):
+        config.set(base + ['allow-from'], value='0.0.0.0/0', replace=False)
+        config.set(base + ['allow-from'], value='::/0', replace=False)
+
+    try:
+        with open(file_name, 'w') as f:
+            f.write(config.to_string())
+    except OSError as e:
+        print("Failed to save the modified config: {}".format(e))
+        sys.exit(1)