1 files changed, 161 insertions, 0 deletions
diff --git a/src/conf_mode/vyos_config_ntp.py b/src/conf_mode/vyos_config_ntp.py
new file mode 100755
index 000000000..8be12e44e
--- /dev/null
+++ b/src/conf_mode/vyos_config_ntp.py
@@ -0,0 +1,161 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2018 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 sys
+import os
+
+import jinja2
+import ipaddress
+
+from vyos.config import Config
+from vyos import ConfigError
+
+config_file = r'/etc/ntp.conf'
+
+# Please be careful if you edit the template.
+config_tmpl = """
+### Autogenerated by vyos-config-ntp.py ###
+
+#
+# Non-configurable defaults
+#
+driftfile /var/lib/ntp/ntp.drift
+# By default, only allow ntpd to query time sources, ignore any incoming requests
+restrict default ignore
+# Local users have unrestricted access, allowing reconfiguration via ntpdc
+restrict 127.0.0.1
+restrict -6 ::1
+
+
+#
+# Configurable section
+#
+
+{% if servers -%}
+{% for s in servers -%}
+# Server configuration for: {{ s.name }}
+server {{ s.name }} iburst {{ s.options | join(" ") }}
+
+{% endfor -%}
+{% endif %}
+
+{% if allowed_networks -%}
+{% for n in allowed_networks -%}
+# Client configuration for network: {{ n.network }}
+restrict {{ n.address }} mask {{ n.netmask }} nomodify notrap nopeer
+
+{% endfor -%}
+{% endif %}
+
+"""
+
+default_config_data = {
+    'servers': [],
+    'allowed_networks': []
+}
+
+def get_config():
+    ntp = default_config_data
+    conf = Config()
+    if not conf.exists('system ntp'):
+        return None
+    else:
+        conf.set_level('system ntp')
+
+    if conf.exists('allow-clients address'):
+        networks = conf.return_values('allow-clients address')
+        for n in networks:
+            addr = ipaddress.ip_network(n)
+            net = {
+                "network" : n,
+                "address" : addr.network_address,
+                "netmask" : addr.netmask
+            }
+
+            ntp['allowed_networks'].append(net)
+
+    if conf.exists('server'):
+        for node in conf.list_nodes('server'):
+            options = []
+            server = {
+                "name": node,
+                "options": []
+            }
+            if conf.exists('server {0} dynamic'.format(node)):
+                options.append('dynamic')
+            if conf.exists('server {0} noselect'.format(node)):
+                options.append('noselect')
+            if conf.exists('server {0} preempt'.format(node)):
+                options.append('preempt')
+            if conf.exists('server {0} prefer'.format(node)):
+                options.append('prefer')
+
+            server['options'] = options
+            ntp['servers'].append(server)
+
+    return ntp
+
+def verify(ntp):
+    # bail out early - looks like removal from running config
+    if ntp is None:
+        return None
+
+    # Configuring allowed clients without a server makes no sense
+    if len(ntp['allowed_networks']) and not len(ntp['servers']):
+        raise ConfigError('NTP server not configured')
+
+    for n in ntp['allowed_networks']:
+        try:
+            addr = ipaddress.ip_network( n['network'] )
+            break
+        except ValueError:
+            raise ConfigError("{0} does not appear to be a valid IPv4 or IPv6 network, check host bits!".format(n['network']))
+
+    return None
+
+def generate(ntp):
+    # bail out early - looks like removal from running config
+    if ntp is None:
+        return None
+
+    tmpl = jinja2.Template(config_tmpl)
+    config_text = tmpl.render(ntp)
+    with open(config_file, 'w') as f:
+        f.write(config_text)
+
+    return None
+
+def apply(ntp):
+    if ntp is not None:
+        os.system('sudo /usr/sbin/invoke-rc.d ntp force-reload')
+    else:
+        # NTP suuport is removed in the commit
+        os.system('sudo /usr/sbin/invoke-rc.d ntp stop')
+        os.unlink(config_file)
+
+    return None
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        sys.exit(1)