1 files changed, 96 insertions, 0 deletions
diff --git a/src/conf_mode/host_name.py b/src/conf_mode/host_name.py
new file mode 100755
index 000000000..2a245b211
--- /dev/null
+++ b/src/conf_mode/host_name.py
@@ -0,0 +1,96 @@
+#!/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
+import subprocess
+
+from vyos.config import Config
+from vyos.util import ConfigError
+
+hostname_regex = re.compile("^[A-Za-z0-9][-.A-Za-z0-9]*[A-Za-z0-9]$")
+
+def get_config():
+    conf = Config()
+
+    hostname = conf.return_value("system host-name")
+    domain = conf.return_value("system domain-name")
+
+    # No one likes fixups, but we really don't want VyOS fail to boot
+    # if hostname is not in the config
+    if not hostname:
+        hostname = "vyos"
+
+    if domain:
+        fqdn = "{0}.{1}".format(hostname, domain)
+    else:
+        fqdn = hostname
+
+    return {"hostname": hostname, "domain": domain, "fqdn": fqdn}
+
+def verify(config):
+    # check for invalid host
+	
+    # pattern $VAR(@) "^[[:alnum:]][-.[:alnum:]]*[[:alnum:]]$" ; "invalid host name $VAR(@)"
+    if not hostname_regex.match(config["hostname"]):
+        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, must be less than 63 characters')
+
+    return None
+
+
+def generate(config):
+    # read the hosts file
+    with open('/etc/hosts', 'r') as f:
+        hosts = f.read()
+
+    # get the current hostname
+    old_hostname = subprocess.check_output(['hostname']).decode().strip()
+
+    # replace the local host line
+    hosts = re.sub(r"(127.0.1.1\s+{0}.*)".format(old_hostname), r"127.0.1.1\t{0} # VyOS entry\n".format(config["fqdn"]), hosts)
+
+    with open('/etc/hosts', 'w') as f:
+        f.write(hosts)
+
+    return None
+
+
+def apply(config):
+    os.system("hostnamectl set-hostname {0}".format(config["fqdn"]))
+
+    # restart services that use the hostname
+    os.system("systemctl restart rsyslog.service")
+
+    return None
+
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        sys.exit(1)