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#!/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 os
import re
import sys
from vyos.config import Config
from vyos.util import ConfigError
hostname_config = "/etc/hostname"
mailname_config = "/etc/mailname"
hostname_regex = re.compile("^[A-Za-z0-9][-.A-Za-z0-9]*[A-Za-z0-9]$")
def get_config():
conf = Config()
conf.set_level("system")
hostname = conf.return_value("host-name")
domain = conf.return_value("domain-name")
return {
"hostname": hostname,
"domain": domain
}
def verify(config):
# check for invalid host
# pattern $VAR(@) "^[[:alnum:]][-.[:alnum:]]*[[:alnum:]]$" ; "invalid host name $VAR(@)"
valid = hostname_regex.match(config.hostname)
if (!valid):
raise ConfigError('invalid host name' + config.hostname)
# pattern $VAR(@) "^.{1,63}$" ; "invalid host-name length"
length = len(config.hostname)
if length < 1 or length > 63:
raise ConfigError('invalid host-name length')
return None
def generate(config):
mailname = config.hostname
if config.domain != "":
mailname += '.' + config.domain
# update /etc/hostname
with open(hostname_config, 'w') as f:
f.write(config.hostname)
# update /etc/mailname
with open(mailname_config, 'w') as f:
f.write(mailname)
return None
def apply(config):
# set hostname for the current session
cmd = "hostname " + config.hostname
os.system(cmd)
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
sys.exit(1)
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