banner: T2024: migrate "system login banner" to XML/Python representation

1 files changed, 92 insertions, 0 deletions

diff --git a/src/conf_mode/system-login-banner.py b/src/conf_mode/system-login-banner.py
new file mode 100755
index 000000000..f92f23d6c
--- /dev/null
+++ b/src/conf_mode/system-login-banner.py
@@ -0,0 +1,92 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 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/>.
+
+from sys import exit
+from vyos.config import Config
+
+motd="""
+
+The programs included with the Debian GNU/Linux system are free software;
+the exact distribution terms for each program are described in the
+individual files in /usr/share/doc/*/copyright.
+
+Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
+permitted by applicable law.
+"""
+
+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',
+    'issue_net': 'Welcome to VyOS',
+    'motd': motd
+}
+
+def get_config():
+    banner = default_config_data
+    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'])
+        tmp = tmp.replace('\\n','\n')
+        tmp = tmp.replace('\\t','\t')
+        banner['motd'] = tmp
+
+    # Pre-Login banner
+    if conf.exists(['pre-login']):
+        tmp = conf.return_value(['pre-login'])
+        tmp = tmp.replace('\\n','\n')
+        tmp = tmp.replace('\\t','\t')
+        banner['issue'] = banner['issue_net'] = tmp
+
+    return banner
+
+def verify(banner):
+    pass
+
+def generate(banner):
+    pass
+
+def apply(banner):
+    with open(PRELOGIN_FILE, 'w') as f:
+        f.write(banner['issue'])
+
+    with open(PRELOGIN_NET_FILE, 'w') as f:
+        f.write(banner['issue_net'])
+
+    with open(POSTLOGIN_FILE, 'w') as f:
+        f.write(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)