isis: T1316: October steps

1 files changed, 137 insertions, 0 deletions

diff --git a/src/conf_mode/protocols_isis.py b/src/conf_mode/protocols_isis.py
new file mode 100755
index 000000000..4ee6b31f6
--- /dev/null
+++ b/src/conf_mode/protocols_isis.py
@@ -0,0 +1,137 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2017-2020 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 os
+
+from sys import exit
+
+from vyos.config import Config
+from vyos import ConfigError
+from vyos.util import call
+from vyos.template import render
+from vyos.template import render_to_string
+from vyos import frr
+from vyos import airbag
+from pprint import pprint
+airbag.enable()
+
+config_file = r'/tmp/isis.frr'
+
+default_config_data = {
+    'interface':  ''
+}
+
+def get_config():
+    conf = Config()
+    base = ['protocols', 'isis']
+    isis = conf.get_config_dict(base, key_mangling=('-', '_'))
+    if not conf.exists(base):
+        isis = {}
+
+    pprint(isis)
+    return isis
+
+def verify(isis):
+    # bail out early - looks like removal from running config
+    if not isis:
+        return None
+
+    for proc_id, foo_config in isis['isis'].items():
+
+        # If more then one isis process is defined (Frr only supports one)
+        # http://docs.frrouting.org/en/latest/isisd.html#isis-router
+        if len(isis['isis']) > 1:
+            raise ConfigError('Only one isis process can be definded')
+
+        # If network entity title (net) not defined
+        if not "net" in  foo_config:
+          raise ConfigError('Define net format iso is mandatory in \"isis {} net"!'.format(proc_id))
+
+        # If interface not set
+        if not "interface" in  foo_config:
+          raise ConfigError('Define interface is mandatory in \"isis {} interface"!'.format(proc_id))
+
+        # If md5 and plaintext-password set at the same time
+        if 'area_password' in foo_config:
+            if "md5" in foo_config['area_password'] and "plaintext_password" in foo_config['area_password']:
+                raise ConfigError('Only one password type should be used in \"isis {} area-password"!'.format(proc_id))
+
+        # If one param from deley set, but not set others
+        if 'spf_delay_ietf' in foo_config:
+            required_timers = ['holddown', 'init_delay', 'long_delay', 'short_delay', 'time_to_learn']
+            exist_timers = []
+            for elm_timer in required_timers:
+                if elm_timer in foo_config['spf_delay_ietf']:
+                    exist_timers.append(elm_timer)
+
+            exist_timers = set(required_timers).difference(set(exist_timers))
+            if len(exist_timers) > 0:
+                raise ConfigError('All types of delay must be specified: ' + ', '.join(exist_timers).replace('_', '-'))
+
+        # If Redistribute set, but level don't set
+        if 'redistribute' in foo_config:
+            proc_level = foo_config.get('level','').replace('-','_')
+            for proto, proto_config in foo_config.get('redistribute', {}).get('ipv4', {}).items():
+                if 'level_1' not in proto_config and 'level_2' not in proto_config:
+                    raise ConfigError('Redistribute level-1 or level-2 should be specified in \"protocols isis {} redistribute ipv4 {}\"'.format(proc_id, proto))
+            for redistribute_level in proto_config.keys():
+                if proc_level and proc_level != 'level_1_2' and proc_level != redistribute_level:
+                    raise ConfigError('\"protocols isis {0} redistribute ipv4 {2} {3}\" cannot be used with \"protocols isis {0} level {1}\"'.format(proc_id, proc_level, proto, redistribute_level))
+
+    return None
+
+def generate(isis):
+    if not isis:
+        isis['new_frr_config'] = ''
+        return None
+
+    # render(config) not needed, its only for debug
+    render(config_file, 'frr/isis.frr.tmpl', isis)
+
+    isis['new_frr_config'] = render_to_string('frr/isis.frr.tmpl', isis)
+
+    return None
+
+def apply(isis):
+
+    # Save original configration prior to starting any commit actions
+    isis['original_config'] = frr.get_configuration(daemon='isisd')
+    isis['modified_config'] = frr.replace_section(isis['original_config'], isis['new_frr_config'], from_re='router isis .*')
+
+    # Debugging
+    print('')
+    print('--------- DEBUGGING ----------')
+    print(f'Existing config:\n{isis["original_config"]}\n\n')
+    print(f'Replacement config:\n{isis["new_frr_config"]}\n\n')
+    print(f'Modified config:\n{isis["modified_config"]}\n\n')
+
+    # Frr Mark configuration will test for syntax errors and exception out if any syntax errors are detected
+    frr.mark_configuration(isis['modified_config'])
+
+    # Commit the resulting new configuration to frr, this will render an frr.CommitError() Exception on fail
+    frr.reload_configuration(isis['modified_config'], daemon='isisd')
+
+    return None
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)