T835: accel-ppp pppoe implementation

1 files changed, 363 insertions, 0 deletions

diff --git a/src/conf_mode/accel_pppoe.py b/src/conf_mode/accel_pppoe.py
new file mode 100755
index 000000000..4aea84c44
--- /dev/null
+++ b/src/conf_mode/accel_pppoe.py
@@ -0,0 +1,363 @@
+#!/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 re
+import subprocess
+import jinja2
+import socket
+import time
+import syslog as sl
+
+from vyos.config import Config
+from vyos import ConfigError
+
+pidfile = r'/var/run/accel_pppoe.pid'
+pppoe_cnf_dir = r'/etc/accel-ppp/pppoe'
+chap_secrets = pppoe_cnf_dir + '/chap-secrets'
+pppoe_conf = pppoe_cnf_dir + '/pppoe.config'
+# accel-pppd -d -c /etc/accel-ppp/pppoe/pppoe.config -p /var/run/accel_pppoe.pid
+
+### config path creation
+if not os.path.exists(pppoe_cnf_dir):
+  os.makedirs(pppoe_cnf_dir)
+  sl.syslog(sl.LOG_NOTICE, pppoe_cnf_dir  + " created")
+
+pppoe_config = '''
+### generated by accel_pppoe.py ### 
+[modules]
+log_syslog
+pppoe
+ippool
+chap-secrets
+auth_pap
+auth_chap_md5
+auth_mschap_v1
+auth_mschap_v2
+pppd_compat
+shaper
+net-snmp
+connlimit
+{% if authentication['mode'] == 'radius' %}
+radius
+{% endif %}
+
+[core]
+thread-count={{thread_cnt}}
+
+[log]
+syslog=accel-pppoe,daemon
+copy=1
+level=5
+
+[snmp]
+master=1
+
+[client-ip-range]
+disable
+
+[ip-pool]
+{% if client_ip_pool %}
+{{client_ip_pool}}
+{% endif %}
+gw-ip-address={{ppp_gw}}
+
+{% if dns %}
+[dns]
+{% if dns[0] %}
+dns1={{dns[0]}}
+{% endif %}
+{% if dns[1] %}
+dns2={{dns[1]}}
+{% endif %}
+{% endif %}
+
+{% if wins %}
+[wins]
+{% if wins[0] %}
+wins1={{wins[0]}}
+{% endif %}
+{% if wins[1] %}
+wins2={{wins[1]}}
+{% endif %}
+{% endif %}
+
+{% if authentication['mode'] == 'local' %}
+[chap-secrets]
+chap-secrets=/etc/accel-ppp/pppoe/chap-secrets
+{% endif %}
+
+{% if authentication['mode'] == 'radius' %}
+[radius]
+{% for rsrv in authentication['radiussrv']: %}
+server={{rsrv}},{{authentication['radiussrv'][rsrv]}}
+{% endfor %}
+timeout=10
+acct-timeout=3
+gw-ip-address={{ppp_gw}}
+verbose=1
+{% endif %}
+
+[ppp]
+verbose=1
+min-mtu={{mtu}}
+mtu={{mtu}}
+mru=1400
+check-ip=1
+mppe=prefer
+ipv4=require
+check-ip=1
+single-session=replace
+mppe=prefer
+lcp-echo-interval=30
+lcp-echo-failure=3
+
+[pppoe]
+verbose=1
+{% if concentrator %}
+ac-name={{concentrator}}
+{% endif %}
+{% if interface %}
+{% for int in interface %}
+interface={{int}}
+{% endfor %}
+{% endif %}
+{% if svc_name %}
+service-name={{svc_name}}
+{% endif %}
+
+
+[connlimit]
+limit=10/min
+burst=3
+timeout=60
+
+[cli]
+tcp=127.0.0.1:2001
+'''
+
+### pppoe chap secrets
+chap_secrets_conf = '''
+# username  server  password  acceptable local IP addresses
+{% for user in authentication['local-users'] %}
+{% if authentication['local-users'][user]['state'] == 'enabled' %}
+{{user}}\t*\t{{authentication['local-users'][user]['passwd']}}\t{{authentication['local-users'][user]['ip']}}
+{% endif %}
+{% endfor %}
+'''
+###
+# inline helper functions
+###
+# depending on hw and threads, daemon needs a little to start
+# if it takes longer than 100 * 0.5 secs, exception is being raised
+# not sure if that's the best way to check it, but it worked so far quite well 
+###
+def chk_con():
+  cnt = 0
+  s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+  while True:
+    try:
+      s.connect(("127.0.0.1", 2001))
+      break
+    except ConnectionRefusedError:
+      time.sleep(0.5)
+      cnt +=1
+      if cnt == 100:
+        raise("failed to start pppoe server")
+        break
+
+### chap_secrets file if auth mode local
+def write_chap_secrets(c):
+  tmpl = jinja2.Template(chap_secrets_conf, trim_blocks=True)
+  chap_secrets_txt = tmpl.render(c)
+  old_umask = os.umask(0o077)
+  open(chap_secrets,'w').write(chap_secrets_txt)
+  os.umask(old_umask)
+  sl.syslog(sl.LOG_NOTICE, chap_secrets + ' written')
+
+def accel_cmd(cmd=''):
+  if not cmd:
+    return None
+  try:
+    ret = subprocess.check_output(['/usr/bin/accel-cmd',cmd]).decode().strip()
+    return ret
+  except:
+    return 1
+
+### 
+# inline helper functions end
+###
+
+def get_config():
+  c = Config()
+  if not c.exists('service pppoe-server'):
+    return None
+
+  config_data = {
+    'concentrator'    : 'vyos-ac',
+    'authentication'  : {
+      'local-users'   : {
+      },
+      'mode'          : 'local',
+      'radiussrv'     : {}
+    },
+    'client_ip_pool'  : '',
+    'interface'       : [],
+    'ppp_gw'          : '',
+    'svc_name'        : '',
+    'dns'             : [],
+    'wins'            : [],
+    'mtu'             : '1492'
+  }
+
+  c.set_level('service pppoe-server')
+    
+  if c.exists('access-concentrator'):
+    config_data['concentrator'] = c.return_value('access-concentrator')
+  if c.exists('service-name'):
+    config_data['svc_name'] = c.return_value('service-name')
+  if c.exists('interface'):
+    config_data['interface'] = c.return_values('interface')
+  if c.exists('local-ip'):
+    config_data['ppp_gw'] = c.return_value('local-ip')
+  if c.exists('dns-servers'):
+    if c.return_value('dns-servers server-1'):
+      config_data['dns'].append(c.return_value('dns-servers server-1'))
+    if c.return_value('dns-servers server-2'):
+      config_data['dns'].append(c.return_value('dns-servers server-2'))
+  if c.exists('wins-servers'):
+    if c.return_value('wins-servers server-1'):
+      config_data['wins'].append(c.return_value('wins-servers server-1'))
+    if c.return_value('wins-servers server-2'):
+      config_data['wins'].append(c.return_value('wins-servers server-2'))
+  if c.exists('client-ip-pool'):
+    if c.exists('client-ip-pool start'):
+      config_data['client_ip_pool'] = c.return_value('client-ip-pool start') 
+    if c.exists('client-ip-pool stop'):
+      config_data['client_ip_pool'] += '-' + re.search('[0-9]+$', c.return_value('client-ip-pool stop')).group(0)
+    else:
+      raise ConfigError('client ip pool stop required')
+
+  #### authentication mode local
+  if c.exists('authentication'):
+    if c.return_value('authentication mode') == 'local':
+      if c.exists('authentication local-users username'):
+        for usr in c.list_nodes('authentication local-users username'):
+          config_data['authentication']['local-users'].update(
+            {
+              usr : {
+                'passwd' : '',
+                'state'  : 'enabled',
+                'ip'     : '*'
+              }
+            }
+          )
+          if c.exists('authentication local-users username ' + usr + ' password'):
+            config_data['authentication']['local-users'][usr]['passwd'] = c.return_value('authentication local-users username ' + usr + ' password')
+          if c.exists('authentication local-users username ' + usr + ' disable'):
+            config_data['authentication']['local-users'][usr]['state'] = 'disable'
+          if c.exists('authentication local-users username ' + usr + ' static-ip'):
+            config_data['authentication']['local-users'][usr]['ip'] = c.return_value('authentication local-users username ' + usr + ' static-ip')
+   
+    ### authentication mode radius
+    if c.return_value('authentication mode') == 'radius':
+      config_data['authentication']['mode'] = 'radius'
+      rsrvs = c.list_nodes('authentication radius-server')
+      for rsrv in rsrvs:
+        config_data['authentication']['radiussrv'].update(
+          {
+            rsrv  : str(c.return_value('authentication radius-server ' + rsrv + ' key')) 
+          }
+        )
+
+  if c.exists('mtu'):
+    config_data['mtu'] = c.return_value('mtu')
+
+  return config_data
+
+def verify(c):
+  if c == None:
+    return None
+
+  for usr in c['authentication']['local-users']:
+    if not c['authentication']['local-users'][usr]:
+      raise ConfigError('user ' + usr + ' has no password set')
+
+  if not c['ppp_gw']:
+    raise ConfigError('pppoe gateway-ip required')
+
+  if c['authentication']['mode'] == 'radius':
+    if len(c['authentication']['radiussrv']) == 0:
+      raise ConfigError('radius server required')
+
+def generate(c):
+  if c == None:
+    return None
+  
+  ### accel-cmd reload doesn't work so any change results in a restart of the daemon
+  try:
+    if os.cpu_count() == 1:
+      c['thread_cnt'] = 1
+    else:
+      c['thread_cnt'] = int(os.cpu_count()/2)
+  except KeyError:
+    if os.cpu_count() == 1:
+      c['thread_cnt'] = 1
+    else:
+      c['thread_cnt'] = int(os.cpu_count()/2)
+
+  tmpl = jinja2.Template(pppoe_config, trim_blocks=True)
+  config_text = tmpl.render(c)
+  open(pppoe_conf,'w').write(config_text)
+  sl.syslog(sl.LOG_NOTICE, pppoe_config + ' written')
+
+  return c
+
+def apply(c):
+  if c == None:
+    if os.path.exists(pidfile):
+      accel_cmd('shutdown hard')
+      if os.path.exists(pidfile):
+        os.remove(pidfile)
+    return None
+
+  if not os.path.exists(pidfile):
+    ret = subprocess.call(['/usr/sbin/accel-pppd','-c',pppoe_conf,'-p',pidfile,'-d'])
+    chk_con()
+    if ret !=0 and os.path.exists(pidfile):
+      os.remove(pidfile)
+      raise ConfigError('accel-pppd failed to start')
+  else:
+    accel_cmd('restart')
+    sl.syslog(sl.LOG_NOTICE, "reloading config via daemon restart")
+
+  #if c['state'] == 'update':
+   # accel_cmd('restart')
+   # sl.syslog(sl.LOG_NOTICE, "reloading config via daemon restart") 
+   # ## check that config reload actually works
+
+if __name__ == '__main__':
+  try:
+    c = get_config()
+    verify(c)
+    generate(c)
+    apply(c)
+  except ConfigError as e:
+    print(e)
+    sys.exit(1)