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Diffstat (limited to 'src/conf_mode/service_tftp-server.py')
-rwxr-xr-xsrc/conf_mode/service_tftp-server.py142
1 files changed, 142 insertions, 0 deletions
diff --git a/src/conf_mode/service_tftp-server.py b/src/conf_mode/service_tftp-server.py
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+++ b/src/conf_mode/service_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.base import Warning
+from vyos.config import Config
+from vyos.configverify import verify_vrf
+from vyos.template import render
+from vyos.template import is_ipv4
+from vyos.utils.process import call
+from vyos.utils.permission import chmod_755
+from vyos.utils.network import is_addr_assigned
+from vyos import ConfigError
+from vyos import airbag
+airbag.enable()
+
+config_file = r'/etc/default/tftpd'
+
+def get_config(config=None):
+ if config:
+ conf = config
+ else:
+ conf = Config()
+
+ base = ['service', 'tftp-server']
+ if not conf.exists(base):
+ return None
+
+ tftpd = conf.get_config_dict(base, key_mangling=('-', '_'),
+ get_first_key=True,
+ with_recursive_defaults=True)
+ return tftpd
+
+def verify(tftpd):
+ # bail out early - looks like removal from running config
+ if not tftpd:
+ return None
+
+ # Configuring allowed clients without a server makes no sense
+ if 'directory' not in tftpd:
+ raise ConfigError('TFTP root directory must be configured!')
+
+ if 'listen_address' not in tftpd:
+ raise ConfigError('TFTP server listen address must be configured!')
+
+ for address, address_config in tftpd['listen_address'].items():
+ if not is_addr_assigned(address):
+ Warning(f'TFTP server listen address "{address}" not ' \
+ 'assigned to any interface!')
+ verify_vrf(address_config)
+
+ 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 address, address_config in tftpd['listen_address'].items():
+ config = deepcopy(tftpd)
+ port = tftpd['port']
+ if is_ipv4(address):
+ config['listen_address'] = f'{address}:{port} -4'
+ else:
+ config['listen_address'] = f'[{address}]:{port} -6'
+
+ if 'vrf' in address_config:
+ config['vrf'] = address_config['vrf']
+
+ file = config_file + str(idx)
+ render(file, 'tftp-server/default.j2', config)
+ idx = idx + 1
+
+ return None
+
+def apply(tftpd):
+ # stop all services first - then we will decide
+ call('systemctl stop tftpd@*.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)
+ chmod_755(tftp_root)
+
+ # 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 address in tftpd['listen_address']:
+ call(f'systemctl restart tftpd@{idx}.service')
+ 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)