dns: T5115: Support custom port for name servers for forwarding zones.

This would allow using custom ports in name server operating on non-
default port for forwarding zones.

This is a follow-up to T5113 for sake of completeness and having
consistent treatment of all name servers configured in PowerDNS recursor.

Additionally, migrate `service dns forwarding domain example.com server`
to `service dns forwarding domain foo3.com name-server` for consistency
and reusability.

1 files changed, 49 insertions, 0 deletions

diff --git a/src/migration-scripts/dns-forwarding/3-to-4 b/src/migration-scripts/dns-forwarding/3-to-4
new file mode 100755
index 000000000..55165c2c5
--- /dev/null
+++ b/src/migration-scripts/dns-forwarding/3-to-4
@@ -0,0 +1,49 @@
+#!/usr/bin/env python3
+
+# Copyright (C) 2023 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/>.
+
+# T5115: migrate "service dns forwarding domain example.com server" to
+#                "service dns forwarding domain example.com name-server"
+
+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', 'domain']
+if not config.exists(base):
+    # Nothing to do
+    sys.exit(0)
+
+for domain in config.list_nodes(base):
+    if config.exists(base + [domain, 'server']):
+        config.copy(base + [domain, 'server'], base + [domain, 'name-server'])
+        config.delete(base + [domain, 'server'])
+
+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)