Decode ODS commands

ODS commands are ASCII strings, but socket.recv() returns bytes and
socket.send() expects bytes. Encode/decode values properly.

Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>

daemons/dnssec/ipa-ods-exporter

@@ -17,19 +17,21 @@ Purpose of this replacement is to upload keys generated by OpenDNSSEC to LDAP.
 from __future__ import print_function
 
 from datetime import datetime
-import dateutil.tz
-import dns.dnssec
-from gssapi.exceptions import GSSError
 import logging
 import os
 import socket
 import select
 import sys
-import systemd.daemon
-import systemd.journal
 import sqlite3
 import traceback
 
+import dateutil.tz
+import dns.dnssec
+from gssapi.exceptions import GSSError
+import six
+import systemd.daemon
+import systemd.journal
+
 import ipalib
 from ipalib.constants import SOFTHSM_DNSSEC_TOKEN_LABEL
 from ipalib.install.kinit import kinit_keytab
@@ -470,8 +472,11 @@ def receive_systemd_command():
 
     # this implements cmdhandler_handle_cmd() logic
     cmd = conn.recv(ODS_SE_MAXLINE).strip()
+    # ODS uses an ASCII protocol
+    if not isinstance(cmd, six.text_type):
+        cmd = cmd.decode('ascii')
     logger.debug('received command "%s" from systemd socket', cmd)
-    return (cmd, conn)
+    return cmd, conn
 
 def parse_command(cmd):
     """Parse command to (exit code, message, zone_name) tuple.
@@ -516,7 +521,9 @@ def parse_command(cmd):
 def send_systemd_reply(conn, reply):
         # Reply & close connection early.
         # This is necessary to let Enforcer to unlock the ODS DB.
-        conn.send(reply + '\n')
+        if isinstance(reply, six.text_type):
+            reply = reply.encode('ascii')
+        conn.send(reply + b'\n')
         conn.shutdown(socket.SHUT_RDWR)
         conn.close()