diff options
Diffstat (limited to 'src/conf_mode/interfaces-wirelessmodem.py')
| -rwxr-xr-x | src/conf_mode/interfaces-wirelessmodem.py | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/src/conf_mode/interfaces-wirelessmodem.py b/src/conf_mode/interfaces-wirelessmodem.py new file mode 100755 index 000000000..14178d74c --- /dev/null +++ b/src/conf_mode/interfaces-wirelessmodem.py @@ -0,0 +1,232 @@ +#!/usr/bin/env python3 +# +# Copyright (C) 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 copy import deepcopy +from jinja2 import Template +from subprocess import Popen, PIPE +from pwd import getpwnam +from grp import getgrnam + +from vyos.config import Config +from vyos import ConfigError + +# Please be careful if you edit the template. +config_wwan_tmpl = """### Autogenerated by interfaces-wirelessmodem.py ### +{% if description %} +# {{ description }} +{% endif %} + +# physical device +/dev/{{ device }} + +ipparam {{ intf }} {{ metric }} +ifname {{ intf }} +linkname {{ intf }} +{% if on_demand -%} +demand +{%- endif %} +{% if name_server -%} +usepeerdns +{%- endif %} +lcp-echo-failure 0 +115200 +debug +logfile {{ logfile }} +nodefaultroute +ipcp-max-failure 4 +ipcp-accept-local +ipcp-accept-remote +noauth +crtscts +lock +persist + +connect '/usr/sbin/chat -v -t6 -f {{ chat_script }}' + +""" + +# Please be careful if you edit the template. +chat_wwan_tmpl = """ +ABORT 'NO DIAL TONE' ABORT 'NO ANSWER' ABORT 'NO CARRIER' ABORT DELAYED +'' AT +OK ATZ +OK 'AT+CGDCONT=1,"IP","{{ apn }}"' +OK ATD*99# +CONNECT '' + +""" + +default_config_data = { + 'address': [], + 'apn': '', + 'chat_script': '', + 'deleted': False, + 'description': '', + 'device': 'ttyUSB0', + 'disable': False, + 'disable_link_detect': 1, + 'on_demand': False, + 'logfile': '', + 'metric': '10', + 'mtu': '1500', + 'name_server': True, + 'intf': '' +} + +def subprocess_cmd(command): + p = Popen(command, stdout=PIPE, shell=True) + p.communicate() + +def check_kmod(): + modules = ['option', 'usb_wwan', 'usbserial'] + for module in modules: + if not os.path.exists(f'/sys/module/{module}'): + if os.system(f'modprobe {module}') != 0: + raise ConfigError(f'Loading Kernel module {module} failed') + +def get_config(): + wwan = deepcopy(default_config_data) + conf = Config() + + # determine tagNode instance + if 'VYOS_TAGNODE_VALUE' not in os.environ: + raise ConfigError('Interface (VYOS_TAGNODE_VALUE) not specified') + + wwan['intf'] = os.environ['VYOS_TAGNODE_VALUE'] + wwan['logfile'] = f"/var/log/vyatta/ppp_{wwan['intf']}.log" + wwan['chat_script'] = f"/etc/ppp/peers/chat.{wwan['intf']}" + + # Check if interface has been removed + if not conf.exists('interfaces wirelessmodem ' + wwan['intf']): + wwan['deleted'] = True + return wwan + + # set new configuration level + conf.set_level('interfaces wirelessmodem ' + wwan['intf']) + + # get metrick for backup default route + if conf.exists(['apn']): + wwan['apn'] = conf.return_value(['apn']) + + # get metrick for backup default route + if conf.exists(['backup', 'distance']): + wwan['metric'] = conf.return_value(['backup', 'distance']) + + # Retrieve interface description + if conf.exists(['description']): + wwan['description'] = conf.return_value(['description']) + + # System device name + if conf.exists(['device']): + wwan['device'] = conf.return_value(['device']) + + # disable interface + if conf.exists('disable'): + wwan['disable'] = True + + # ignore link state changes + if conf.exists('disable-link-detect'): + wwan['disable_link_detect'] = 2 + + # Do not use DNS servers provided by the peer + if conf.exists(['mtu']): + wwan['mtu'] = conf.return_value(['mtu']) + + # Do not use DNS servers provided by the peer + if conf.exists(['no-peer-dns']): + wwan['name_server'] = False + + # Access concentrator name (only connect to this concentrator) + if conf.exists(['ondemand']): + wwan['on_demand'] = True + + return wwan + +def verify(wwan): + if wwan['deleted']: + return None + + if not wwan['apn']: + raise ConfigError(f"APN for {wwan['intf']} not configured") + + # we can not use isfile() here as Linux device files are no regular files + # thus the check will return False + if not os.path.exists(f"/dev/{wwan['device']}"): + raise ConfigError(f"Device {wwan['device']} does not exist") + + return None + +def generate(wwan): + config_file_wwan = f"/etc/ppp/peers/{wwan['intf']}" + + # Always hang-up WWAN connection prior generating new configuration file + cmd = f"systemctl stop ppp@{wwan['intf']}.service" + subprocess_cmd(cmd) + + if wwan['deleted']: + # Delete PPP configuration files + if os.path.exists(config_file_wwan): + os.unlink(config_file_wwan) + if os.path.exists(wwan['chat_script']): + os.unlink(wwan['chat_script']) + + else: + # Create PPP configuration files + tmpl = Template(config_wwan_tmpl) + config_text = tmpl.render(wwan) + with open(config_file_wwan, 'w') as f: + f.write(config_text) + + + # Create PPP chat script + tmpl = Template(chat_wwan_tmpl) + config_text = tmpl.render(wwan) + with open(wwan['chat_script'], 'w') as f: + f.write(config_text) + + return None + +def apply(wwan): + if wwan['deleted']: + # bail out early + return None + + if not wwan['disable']: + # dial WWAN connection + cmd = f"systemctl start ppp@{wwan['intf']}.service" + subprocess_cmd(cmd) + + # make logfile owned by root / vyattacfg + if os.path.isfile(wwan['logfile']): + uid = getpwnam('root').pw_uid + gid = getgrnam('vyattacfg').gr_gid + os.chown(wwan['logfile'], uid, gid) + + return None + +if __name__ == '__main__': + try: + check_kmod() + c = get_config() + verify(c) + generate(c) + apply(c) + except ConfigError as e: + print(e) + exit(1) |