T5474: establish common file name pattern for XML conf mode commands

We will use _ as CLI level divider. The XML definition filename and also
the Python helper should match the CLI node.

Example:
set interfaces ethernet -> interfaces_ethernet.xml.in
set interfaces bond -> interfaces_bond.xml.in
set service dhcp-server -> service_dhcp-server-xml.in

(cherry picked from commit 4ef110fd2c501b718344c72d495ad7e16d2bd465)

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
new file mode 100755
index 000000000..3ad346e2e
--- /dev/null
+++ b/src/conf_mode/service_tftp-server.py
@@ -0,0 +1,142 @@
+#!/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)