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tftp_server.py
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tftp_server.py
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#!/usr/bin/env python3
#
# Copyright (C) 2018-2020 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
import stat
import pwd
from copy import deepcopy
from glob import glob
from sys import exit
from vyos.config import Config
from vyos.validate import is_ipv4, is_addr_assigned
from vyos import ConfigError
from vyos.util import call
from vyos.template import render
from vyos import airbag
airbag.enable()
config_file = r'/etc/default/tftpd'
default_config_data = {
'directory': '',
'allow_upload': False,
'port': '69',
'listen': []
}
def get_config(config=None):
tftpd = deepcopy(default_config_data)
if config:
conf = config
else:
conf = Config()
base = ['service', 'tftp-server']
if not conf.exists(base):
return None
else:
conf.set_level(base)
if conf.exists(['directory']):
tftpd['directory'] = conf.return_value(['directory'])
if conf.exists(['allow-upload']):
tftpd['allow_upload'] = True
if conf.exists(['port']):
tftpd['port'] = conf.return_value(['port'])
if conf.exists(['listen-address']):
tftpd['listen'] = conf.return_values(['listen-address'])
return tftpd
def verify(tftpd):
# bail out early - looks like removal from running config
if tftpd is None:
return None
# Configuring allowed clients without a server makes no sense
if not tftpd['directory']:
raise ConfigError('TFTP root directory must be configured!')
if not tftpd['listen']:
raise ConfigError('TFTP server listen address must be configured!')
for addr in tftpd['listen']:
if not is_addr_assigned(addr):
print('WARNING: TFTP server listen address {0} not assigned to any interface!'.format(addr))
return None
def generate(tftpd):
# cleanup any available configuration file
# files will be recreated on demand
for i in glob(config_file + '*'):
os.unlink(i)
# bail out early - looks like removal from running config
if tftpd is None:
return None
idx = 0
for listen in tftpd['listen']:
config = deepcopy(tftpd)
if is_ipv4(listen):
config['listen'] = [listen + ":" + tftpd['port'] + " -4"]
else:
config['listen'] = ["[" + listen + "]:" + tftpd['port'] + " -6"]
file = config_file + str(idx)
render(file, 'tftp-server/default.tmpl', config)
idx = idx + 1
return None
def apply(tftpd):
# stop all services first - then we will decide
call('systemctl stop tftpd@{0..20}.service')
# bail out early - e.g. service deletion
if tftpd is None:
return None
tftp_root = tftpd['directory']
if not os.path.exists(tftp_root):
os.makedirs(tftp_root)
os.chmod(tftp_root, stat.S_IRUSR|stat.S_IWUSR|stat.S_IXUSR|stat.S_IRGRP|stat.S_IXGRP|stat.S_IROTH|stat.S_IXOTH)
# get UNIX uid for user 'tftp'
tftp_uid = pwd.getpwnam('tftp').pw_uid
tftp_gid = pwd.getpwnam('tftp').pw_gid
# get UNIX uid for tftproot directory
dir_uid = os.stat(tftp_root).st_uid
dir_gid = os.stat(tftp_root).st_gid
# adjust uid/gid of tftproot directory if files don't belong to user tftp
if (tftp_uid != dir_uid) or (tftp_gid != dir_gid):
os.chown(tftp_root, tftp_uid, tftp_gid)
idx = 0
for listen in tftpd['listen']:
call('systemctl restart tftpd@{0}.service'.format(idx))
idx = idx + 1
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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