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#!/usr/bin/env python3
#
# Copyright (C) 2020-2021 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/>.
from sys import exit
from copy import deepcopy
from vyos.config import Config
from vyos.utils.file import write_file
from vyos import ConfigError
from vyos import airbag
airbag.enable()
try:
with open('/usr/share/vyos/default_motd') as f:
motd = f.read()
except:
# Use an empty banner if the default banner file cannot be read
motd = "\n"
PRELOGIN_FILE = r'/etc/issue'
PRELOGIN_NET_FILE = r'/etc/issue.net'
POSTLOGIN_FILE = r'/etc/motd'
default_config_data = {
'issue': 'Welcome to VyOS - \\n \\l\n\n',
'issue_net': '',
'motd': motd
}
def get_config(config=None):
banner = deepcopy(default_config_data)
if config:
conf = config
else:
conf = Config()
base_level = ['system', 'login', 'banner']
if not conf.exists(base_level):
return banner
else:
conf.set_level(base_level)
# Post-Login banner
if conf.exists(['post-login']):
tmp = conf.return_value(['post-login'])
# post-login banner can be empty as well
if tmp:
tmp = tmp.replace('\\n','\n')
tmp = tmp.replace('\\t','\t')
# always add newline character
tmp += '\n'
else:
tmp = ''
banner['motd'] = tmp
# Pre-Login banner
if conf.exists(['pre-login']):
tmp = conf.return_value(['pre-login'])
# pre-login banner can be empty as well
if tmp:
tmp = tmp.replace('\\n','\n')
tmp = tmp.replace('\\t','\t')
# always add newline character
tmp += '\n'
else:
tmp = ''
banner['issue'] = banner['issue_net'] = tmp
return banner
def verify(banner):
pass
def generate(banner):
pass
def apply(banner):
write_file(PRELOGIN_FILE, banner['issue'])
write_file(PRELOGIN_NET_FILE, banner['issue_net'])
write_file(POSTLOGIN_FILE, banner['motd'])
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)
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