1 files changed, 78 insertions, 0 deletions
diff --git a/python/vyos/configverify.py b/python/vyos/configverify.py
new file mode 100644
index 000000000..32129a048
--- /dev/null
+++ b/python/vyos/configverify.py
@@ -0,0 +1,78 @@
+# Copyright 2020 VyOS maintainers and contributors <maintainers@vyos.io>
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library 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
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library.  If not, see <http://www.gnu.org/licenses/>.
+
+# The sole purpose of this module is to hold common functions used in
+# all kinds of implementations to verify the CLI configuration.
+# It is started by migrating the interfaces to the new get_config_dict()
+# approach which will lead to a lot of code that can be reused.
+
+# NOTE: imports should be as local as possible to the function which
+# makes use of it!
+
+from vyos import ConfigError
+
+def verify_vrf(config):
+    """
+    Common helper function used by interface implementations to perform
+    recurring validation of VRF configuration.
+    """
+    from netifaces import interfaces
+    if 'vrf' in config.keys():
+        if config['vrf'] not in interfaces():
+            raise ConfigError('VRF "{vrf}" does not exist'.format(**config))
+
+        if 'is_bridge_member' in config.keys():
+            raise ConfigError(
+                'Interface "{ifname}" cannot be both a member of VRF "{vrf}" '
+                'and bridge "{is_bridge_member}"!'.format(**config))
+
+
+def verify_address(config):
+    """
+    Common helper function used by interface implementations to
+    perform recurring validation of IP address assignmenr
+    when interface also is part of a bridge.
+    """
+    if {'is_bridge_member', 'address'} <= set(config):
+        raise ConfigError(
+            f'Cannot assign address to interface "{ifname}" as it is a '
+            f'member of bridge "{is_bridge_member}"!'.format(**config))
+
+
+def verify_bridge_delete(config):
+    """
+    Common helper function used by interface implementations to
+    perform recurring validation of IP address assignmenr
+    when interface also is part of a bridge.
+    """
+    if 'is_bridge_member' in config.keys():
+        raise ConfigError(
+            'Interface "{ifname}" cannot be deleted as it is a '
+            'member of bridge "{is_bridge_member}"!'.format(**config))
+
+
+def verify_source_interface(config):
+    """
+    Common helper function used by interface implementations to
+    perform recurring validation of the existence of a source-interface
+    required by e.g. peth/MACvlan, MACsec ...
+    """
+    from netifaces import interfaces
+    if not 'source_interface' in config.keys():
+        raise ConfigError('Physical source-interface required for '
+                          'interface "{ifname}"'.format(**config))
+    if not config['source_interface'] in interfaces():
+        raise ConfigError(f'Source interface {source_interface} does not '
+                          f'exist'.format(**config))