pppoe: T1318: add first version of new XML/Python implementation

 vyos@vyos# show interfaces pppoe
    pppoe pppoe0 {
      default-route force
      link eth2.7
      mtu 400
      name-server auto
      password 12345678
      user-id vyos@vyos.io
  }

1 files changed, 293 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..eb64d094b
--- /dev/null
+++ b/src/conf_mode/interfaces-pppoe.py
@@ -0,0 +1,293 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2019 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 jinja2 import Template
+from psutil import pid_exists
+from stat import S_IRUSR, S_IWUSR, S_IXUSR, S_IRGRP, S_IXGRP, S_IROTH, S_IXOTH
+from subprocess import Popen, PIPE
+
+from vyos.config import Config
+from vyos import ConfigError
+from netifaces import interfaces
+
+# Please be careful if you edit the template.
+config_pppoe_tmpl = """
+### Autogenerated by interfaces-pppoe.py ###
+
+# Configuration file for PPP, using PPP over Ethernet (PPPOE)
+# to connect to a DSL provider.
+
+# Default parameters not set by Vyatta templates:
+#
+# Require peer to provide the local IP address if it is not
+# specified explicitly in the config file.
+noipdefault
+
+# Don't show the password in logfiles:
+hide-password
+
+# Standard Link Control Protocol (LCP) parameters:
+lcp-echo-interval 20
+lcp-echo-failure 3
+
+# RFC 2516, paragraph 7 mandates that the following options MUST NOT be
+# requested and MUST be rejected if requested by the peer:
+# Address-and-Control-Field-Compression (ACFC)
+noaccomp
+
+# Asynchronous-Control-Character-Map (ACCM)
+default-asyncmap
+
+# Override any connect script that may have been set in /etc/ppp/options.
+connect /bin/true
+
+# Don't try to authenticate the remote node
+noauth
+
+# Don't try to proxy ARP for the remote endpoint. User can set proxy
+# arp entries up manually if they wish.  More importantly, having
+# the "proxyarp" parameter set disables the "defaultroute" option.
+noproxyarp
+
+plugin rp-pppoe.so
+{{ link }}
+persist
+ifname {{ intf }}
+ipparam {{ intf }}
+debug
+logfile /var/log/vyatta/ppp_{{ intf }}.log
+{% if 'auto' in default_route -%}
+defaultroute
+{% elif 'force' in default_route -%}
+defaultroute
+replacedefaultroute
+{% endif %}
+mtu {{ mtu }}
+mru {{ mtu }}
+user "{{ user_id }}"
+password "{{ password }}"
+{% if 'auto' in name_server -%}
+usepeerdns
+{% endif %}
+{% if ipv6_enable -%}
++ipv6
+{% endif %}
+
+"""
+
+config_pppoe_autoconf_tmpl = """
+#!/bin/sh
+
+if [ "$6" != "{{ intf }}" ]; then
+        exit
+fi
+
+echo 0 > /proc/sys/net/ipv6/conf/$1/forwarding
+echo 2 > /proc/sys/net/ipv6/conf/$1/accept_ra
+echo 1 > /proc/sys/net/ipv6/conf/$1/autoconf
+"""
+
+default_config_data = {
+    'access_concentrator': '',
+    'on_demand': False,
+    'default_route': 'auto',
+    'deleted': False,
+    'disable': False,
+    'intf': '',
+    'idle_timeout': '',
+    'ipv6_autoconf': False,
+    'ipv6_enable': False,
+    'link': '',
+    'local_address': '',
+    'mtu': '1492',
+    'name_server': 'auto',
+    'password': '',
+    'remote_address': '',
+    'service_name': '',
+    'user_id': ''
+}
+
+def subprocess_cmd(command):
+    print(command)
+    p = Popen(command, stdout=PIPE, shell=True)
+    p.communicate()
+
+def get_config():
+    pppoe = deepcopy(default_config_data)
+    conf = Config()
+
+    # determine tagNode instance
+    try:
+        pppoe['intf'] = os.environ['VYOS_TAGNODE_VALUE']
+    except KeyError as E:
+        print("Interface not specified")
+
+    # Check if interface has been removed
+    if not conf.exists('interfaces pppoe ' + pppoe['intf']):
+        pppoe['deleted'] = True
+        return pppoe
+
+    # set new configuration level
+    conf.set_level('interfaces pppoe ' + pppoe['intf'])
+
+    # Access concentrator name (only connect to this concentrator)
+    if conf.exists('access-concentrator'):
+        pppoe['access_concentrator'] = conf.return_values('access-concentrator')
+
+    # Access concentrator name (only connect to this concentrator)
+    if conf.exists('connect-on-demand'):
+        pppoe['on_demand'] = True
+
+    # Enable/Disable default route to peer when link comes up
+    if conf.exists('default-route'):
+        pppoe['default_route'] = conf.return_value('default-route')
+
+    # Disable this interface
+    if conf.exists('disable'):
+        pppoe['disable'] = True
+
+    # Delay before disconnecting idle session (in seconds)
+    if conf.exists('idle-timeout'):
+        pppoe['idle_timeout'] = conf.return_value('idle-timeout')
+
+    # Enable Stateless Address Autoconfiguration (SLAAC)
+    if conf.exists('ipv6 address autoconf'):
+        pppoe['ipv6_autoconf'] = True
+
+    # Activate IPv6 support on this connection
+    if conf.exists('ipv6 enable'):
+        pppoe['ipv6_enable'] = True
+
+    # IPv4 address of local end of the PPPoE link
+    if conf.exists('local-address'):
+        pppoe['local_address'] = conf.return_value('local-address')
+
+    # Physical Interface used for this PPPoE session
+    if conf.exists('link'):
+        pppoe['link'] = conf.return_value('link')
+
+    # Maximum Transmission Unit (MTU)
+    if conf.exists('mtu'):
+        pppoe['mtu'] = conf.return_value('mtu')
+
+    # IPv4 address of local end of the PPPoE link
+    if conf.exists('name-server'):
+        pppoe['name_server'] = conf.return_value('name-server')
+
+    # Password for authenticating local machine to PPPoE server
+    if conf.exists('password'):
+        pppoe['password'] = conf.return_value('password')
+
+    # IPv4 address of local end of the PPPoE link
+    if conf.exists('remote-address'):
+        pppoe['remote_address'] = conf.return_value('remote-address')
+
+    # Service name, only connect to access concentrators advertising this
+    if conf.exists('service-name'):
+        pppoe['service_name'] = conf.return_value('service-name')
+
+    # Authentication name supplied to PPPoE server
+    if conf.exists('user-id'):
+        pppoe['user_id'] = conf.return_value('user-id')
+
+    return pppoe
+
+
+def verify(pppoe):
+    if pppoe['deleted']:
+        # bail out early
+        return None
+
+    return None
+
+
+def generate(pppoe):
+    config_file_pppoe = '/etc/ppp/peers/{}'.format(pppoe['intf'])
+    config_file_ifup = '/etc/ppp/ipv6-up.d/50-vyos-{}-autoconf'.format(pppoe['intf'])
+
+    pid = 0
+    pidfile = '/var/run/{}.pid'.format(pppoe['intf'])
+    if os.path.isfile(pidfile):
+        pid = 0
+        with open(pidfile, 'r') as f:
+            pid = int(f.read())
+
+    # Always stop OpenVPN service. We can not send a SIGUSR1 for restart of the
+    # service as the configuration is not re-read. Stop daemon only if it's
+    # running - it could have died or killed by someone evil
+    print("pid: {}".format(pid))
+    if pid_exists(pid):
+        cmd  = 'start-stop-daemon --stop --quiet'
+        cmd += ' --pidfile ' + pidfile
+        subprocess_cmd(cmd)
+
+    if pppoe['deleted']:
+        # Delete PPP configuration files
+        if os.path.exists(config_file_pppoe):
+            os.unlink(config_file_pppoe)
+
+        if os.path.exists(config_file_ifup):
+            os.unlink(config_file_ifup)
+
+    else:
+        # Create PPP configuration files
+        tmpl = Template(config_pppoe_tmpl)
+        config_text = tmpl.render(pppoe)
+        with open(config_file_pppoe, 'w') as f:
+            f.write(config_text)
+
+        tmpl = Template(config_pppoe_autoconf_tmpl)
+        config_text = tmpl.render(pppoe)
+        with open(config_file_ifup, 'w') as f:
+            f.write(config_text)
+
+        os.chmod(config_file_ifup,
+                S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH)
+
+    if not pppoe['disable']:
+        # No matching PPP process running - spawn a new one
+        cmd  = 'start-stop-daemon --start --quiet'
+        cmd += ' --pidfile ' + pidfile
+        cmd += ' --background'
+        cmd += ' --exec /usr/sbin/pppd'
+        # now pass arguments to pppd binary
+        cmd += ' -- '
+        cmd += ' call {}'.format(pppoe['intf'])
+
+        # execute assembled command
+        subprocess_cmd(cmd)
+
+    return None
+
+
+def apply(pppoe):
+    return None
+
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)