T2727: add a dotted decimal validator.

Since it's relatively rarely used, Python's startup time should't
be much of a problem.

1 files changed, 33 insertions, 0 deletions

diff --git a/src/validators/dotted-decimal b/src/validators/dotted-decimal
new file mode 100755
index 000000000..652110346
--- /dev/null
+++ b/src/validators/dotted-decimal
@@ -0,0 +1,33 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2020 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/>.
+
+import re
+import sys
+
+area = sys.argv[1]
+
+res = re.match(r'^(\d+)\.(\d+)\.(\d+)\.(\d+)$', area)
+if not res:
+    print("\'{0}\' is not a valid dotted decimal value".format(area))
+    sys.exit(1)
+else:
+    components = res.groups()
+    for n in range(0, 4):
+        if (int(components[n]) > 255):
+            print("Invalid component of a dotted decimal value: {0} exceeds 255".format(components[n]))
+            sys.exit(1)
+
+sys.exit(0)