T5474: establish common file name pattern for XML conf mode commands

We will use _ as CLI level divider. The XML definition filename and also
the Python helper should match the CLI node.

Example:
set interfaces ethernet -> interfaces_ethernet.xml.in
set interfaces bond -> interfaces_bond.xml.in
set service dhcp-server -> service_dhcp-server-xml.in

(cherry picked from commit 4ef110fd2c501b718344c72d495ad7e16d2bd465)

1 files changed, 148 insertions, 0 deletions

diff --git a/src/conf_mode/interfaces_pppoe.py b/src/conf_mode/interfaces_pppoe.py
new file mode 100755
index 000000000..42f084309
--- /dev/null
+++ b/src/conf_mode/interfaces_pppoe.py
@@ -0,0 +1,148 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2019-2021 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 copy import deepcopy
+from netifaces import interfaces
+
+from vyos.config import Config
+from vyos.configdict import get_interface_dict
+from vyos.configdict import is_node_changed
+from vyos.configdict import get_pppoe_interfaces
+from vyos.configverify import verify_authentication
+from vyos.configverify import verify_source_interface
+from vyos.configverify import verify_interface_exists
+from vyos.configverify import verify_vrf
+from vyos.configverify import verify_mtu_ipv6
+from vyos.configverify import verify_mirror_redirect
+from vyos.ifconfig import PPPoEIf
+from vyos.template import render
+from vyos.utils.process import call
+from vyos.utils.process import is_systemd_service_running
+from vyos import ConfigError
+from vyos import airbag
+airbag.enable()
+
+def get_config(config=None):
+    """
+    Retrive CLI config as dictionary. Dictionary can never be empty, as at least the
+    interface name will be added or a deleted flag
+    """
+    if config:
+        conf = config
+    else:
+        conf = Config()
+    base = ['interfaces', 'pppoe']
+    ifname, pppoe = get_interface_dict(conf, base)
+
+    # We should only terminate the PPPoE session if critical parameters change.
+    # All parameters that can be changed on-the-fly (like interface description)
+    # should not lead to a reconnect!
+    for options in ['access-concentrator', 'connect-on-demand', 'service-name',
+                    'source-interface', 'vrf', 'no-default-route',
+                    'authentication', 'host_uniq']:
+        if is_node_changed(conf, base + [ifname, options]):
+            pppoe.update({'shutdown_required': {}})
+            # bail out early - no need to further process other nodes
+            break
+
+    if 'deleted' not in pppoe:
+        # We always set the MRU value to the MTU size. This code path only re-creates
+        # the old behavior if MRU is not set on the CLI.
+        if 'mru' not in pppoe:
+            pppoe['mru'] = pppoe['mtu']
+
+    return pppoe
+
+def verify(pppoe):
+    if 'deleted' in pppoe:
+        # bail out early
+        return None
+
+    verify_source_interface(pppoe)
+    verify_authentication(pppoe)
+    verify_vrf(pppoe)
+    verify_mtu_ipv6(pppoe)
+    verify_mirror_redirect(pppoe)
+
+    if {'connect_on_demand', 'vrf'} <= set(pppoe):
+        raise ConfigError('On-demand dialing and VRF can not be used at the same time')
+
+    # both MTU and MRU have default values, thus we do not need to check
+    # if the key exists
+    if int(pppoe['mru']) > int(pppoe['mtu']):
+        raise ConfigError('PPPoE MRU needs to be lower then MTU!')
+
+    return None
+
+def generate(pppoe):
+    # set up configuration file path variables where our templates will be
+    # rendered into
+    ifname = pppoe['ifname']
+    config_pppoe = f'/etc/ppp/peers/{ifname}'
+
+    if 'deleted' in pppoe or 'disable' in pppoe:
+        if os.path.exists(config_pppoe):
+            os.unlink(config_pppoe)
+
+        return None
+
+    # Create PPP configuration files
+    render(config_pppoe, 'pppoe/peer.j2', pppoe, permission=0o640)
+
+    return None
+
+def apply(pppoe):
+    ifname = pppoe['ifname']
+    if 'deleted' in pppoe or 'disable' in pppoe:
+        if os.path.isdir(f'/sys/class/net/{ifname}'):
+            p = PPPoEIf(ifname)
+            p.remove()
+        call(f'systemctl stop ppp@{ifname}.service')
+        return None
+
+    # reconnect should only be necessary when certain config options change,
+    # like ACS name, authentication ... (see get_config() for details)
+    if ((not is_systemd_service_running(f'ppp@{ifname}.service')) or
+        'shutdown_required' in pppoe):
+
+        # cleanup system (e.g. FRR routes first)
+        if os.path.isdir(f'/sys/class/net/{ifname}'):
+            p = PPPoEIf(ifname)
+            p.remove()
+
+        call(f'systemctl restart ppp@{ifname}.service')
+        # When interface comes "live" a hook is called:
+        # /etc/ppp/ip-up.d/99-vyos-pppoe-callback
+        # which triggers PPPoEIf.update()
+    else:
+        if os.path.isdir(f'/sys/class/net/{ifname}'):
+            p = PPPoEIf(ifname)
+            p.update(pppoe)
+
+    return None
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)