Merge branch 'master' into trac2036

ChangeLog

+446.	[bug]		muks
+	A number of warnings reported by Python about unclosed file and
+	socket objects were fixed. Some related code was also made safer.
+	(Trac #1828, git 464682a2180c672f1ed12d8a56fd0a5ab3eb96ed)
+
 445.	[bug]*		jinmei
 	The pre-install check for older SQLite3 DB now refers to the DB
 	file with the prefix of DESTDIR.  This ensures that 'make install'

Makefile.am

@@ -16,6 +16,8 @@ DISTCHECK_CONFIGURE_FLAGS = --disable-install-configurations
 # Use same --with-gtest flag if set
 DISTCHECK_CONFIGURE_FLAGS += $(DISTCHECK_GTEST_CONFIGURE_FLAG)
 
+dist_doc_DATA = AUTHORS COPYING ChangeLog README
+
 clean-cpp-coverage:
 	@if [ $(USE_LCOV) = yes ] ; then \
 		$(LCOV) --directory . --zerocounters; \

configure.ac

@@ -1320,6 +1320,7 @@ Developer:
   Valgrind Suppressions: $use_valgrind_suppressions
   C++ Code Coverage: $USE_LCOV
   Python Code Coverage: $USE_PYCOVERAGE
+  Logger checks: $enable_logger_checks
   Generate Manuals:  $enable_man
 
 END

doc/Doxyfile

@@ -579,7 +579,7 @@ INPUT                  = ../src/lib/exceptions ../src/lib/cc \
     ../src/lib/testutils ../src/lib/cache ../src/lib/server_common/ \
     ../src/bin/sockcreator/ ../src/lib/util/ ../src/lib/util/io/ \
     ../src/lib/resolve ../src/lib/acl ../src/bin/dhcp6 ../src/lib/dhcp \
-    ../src/bin/dhcp4 devel
+    ../src/bin/dhcp4 ../tests/tools/perfdhcp devel
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding, which is

doc/guide/Makefile.am

-EXTRA_DIST = bind10-guide.css
-EXTRA_DIST += bind10-guide.xml bind10-guide.html bind10-guide.txt
-EXTRA_DIST += bind10-messages.xml bind10-messages.html
+dist_doc_DATA = bind10-guide.txt
+dist_html_DATA = bind10-guide.css bind10-guide.html bind10-messages.html
+
+EXTRA_DIST = bind10-guide.xml bind10-messages.xml
 
 # This is not a "man" manual, but reuse this for now for docbook.
 if ENABLE_MAN

doc/guide/bind10-guide.xml

@@ -131,7 +131,9 @@
         and <command>b10-zonemgr</command> components require the
         libpython3 library and the Python _sqlite3.so module
         (which is included with Python).
-        The Python module needs to be built for the corresponding Python 3.
+        The <command>b10-stats-httpd</command> component uses the
+        Python pyexpat.so module.
+        The Python modules need to be built for the corresponding Python 3.
       </para>
 <!-- TODO: this will change ... -->
 

src/bin/bind10/tests/bind10_test.py.in

@@ -1055,22 +1055,29 @@ class TestPIDFile(unittest.TestCase):
         # dump PID to the file, and confirm the content is correct
         dump_pid(self.pid_file)
         my_pid = os.getpid()
-        self.assertEqual(my_pid, int(open(self.pid_file, "r").read()))
+        with open(self.pid_file, "r") as f:
+            self.assertEqual(my_pid, int(f.read()))
 
     def test_dump_pid(self):
         self.check_pid_file()
 
         # make sure any existing content will be removed
-        open(self.pid_file, "w").write('dummy data\n')
+        with open(self.pid_file, "w") as f:
+            f.write('dummy data\n')
         self.check_pid_file()
 
     def test_unlink_pid_file_notexist(self):
         dummy_data = 'dummy_data\n'
-        open(self.pid_file, "w").write(dummy_data)
+
+        with open(self.pid_file, "w") as f:
+            f.write(dummy_data)
+
         unlink_pid_file("no_such_pid_file")
+
         # the file specified for unlink_pid_file doesn't exist,
         # and the original content of the file should be intact.
-        self.assertEqual(dummy_data, open(self.pid_file, "r").read())
+        with open(self.pid_file, "r") as f:
+            self.assertEqual(dummy_data, f.read())
 
     def test_dump_pid_with_none(self):
         # Check the behavior of dump_pid() and unlink_pid_file() with None.
@@ -1079,9 +1086,14 @@ class TestPIDFile(unittest.TestCase):
         self.assertFalse(os.path.exists(self.pid_file))
 
         dummy_data = 'dummy_data\n'
-        open(self.pid_file, "w").write(dummy_data)
+
+        with open(self.pid_file, "w") as f:
+            f.write(dummy_data)
+
         unlink_pid_file(None)
-        self.assertEqual(dummy_data, open(self.pid_file, "r").read())
+
+        with open(self.pid_file, "r") as f:
+            self.assertEqual(dummy_data, f.read())
 
     def test_dump_pid_failure(self):
         # the attempt to open file will fail, which should result in exception.

src/bin/bindctl/tests/bindctl_test.py

@@ -425,6 +425,12 @@ class FakeBindCmdInterpreter(bindcmd.BindCmdInterpreter):
 
 class TestBindCmdInterpreter(unittest.TestCase):
 
+    def setUp(self):
+        self.old_stdout = sys.stdout
+
+    def tearDown(self):
+        sys.stdout = self.old_stdout
+
     def _create_invalid_csv_file(self, csvfilename):
         import csv
         csvfile = open(csvfilename, 'w')
@@ -447,19 +453,17 @@ class TestBindCmdInterpreter(unittest.TestCase):
         self.assertEqual(new_csv_dir, custom_cmd.csv_file_dir)
 
     def test_get_saved_user_info(self):
-        old_stdout = sys.stdout
-        sys.stdout = open(os.devnull, 'w')
-        cmd = bindcmd.BindCmdInterpreter()
-        users = cmd._get_saved_user_info('/notexist', 'csv_file.csv')
-        self.assertEqual([], users)
-
-        csvfilename = 'csv_file.csv'
-        self._create_invalid_csv_file(csvfilename)
-        users = cmd._get_saved_user_info('./', csvfilename)
-        self.assertEqual([], users)
-        os.remove(csvfilename)
-        sys.stdout = old_stdout
-
+        with open(os.devnull, 'w') as f:
+            sys.stdout = f
+            cmd = bindcmd.BindCmdInterpreter()
+            users = cmd._get_saved_user_info('/notexist', 'csv_file.csv')
+            self.assertEqual([], users)
+
+            csvfilename = 'csv_file.csv'
+            self._create_invalid_csv_file(csvfilename)
+            users = cmd._get_saved_user_info('./', csvfilename)
+            self.assertEqual([], users)
+            os.remove(csvfilename)
 
 class TestCommandLineOptions(unittest.TestCase):
     def setUp(self):

src/bin/cmdctl/tests/cmdctl_test.py

@@ -84,6 +84,7 @@ class TestSecureHTTPRequestHandler(unittest.TestCase):
         self.handler.rfile = open("check.tmp", 'w+b')
 
     def tearDown(self):
+        sys.stdout.close()
         sys.stdout = self.old_stdout
         self.handler.rfile.close()
         os.remove('check.tmp')
@@ -306,6 +307,7 @@ class TestCommandControl(unittest.TestCase):
         self.cmdctl = MyCommandControl(None, True)
    
     def tearDown(self):
+        sys.stdout.close()
         sys.stdout = self.old_stdout
 
     def _check_config(self, cmdctl):
@@ -427,6 +429,9 @@ class TestSecureHTTPServer(unittest.TestCase):
                                          MyCommandControl, verbose=True)
 
     def tearDown(self):
+        # both sys.stdout and sys.stderr are the same, so closing one is
+        # sufficient
+        sys.stdout.close()
         sys.stdout = self.old_stdout
         sys.stderr = self.old_stderr
 

src/bin/ddns/ddns.py.in

@@ -25,6 +25,7 @@ import isc.ddns.session
 from isc.ddns.zone_config import ZoneConfig
 from isc.ddns.logger import ClientFormatter, ZoneFormatter
 from isc.config.ccsession import *
+from isc.config.module_spec import ModuleSpecError
 from isc.cc import SessionError, SessionTimeout, ProtocolError
 import isc.util.process
 import isc.util.cio.socketsession
@@ -34,6 +35,7 @@ from isc.server_common.dns_tcp import DNSTCPContext
 from isc.datasrc import DataSourceClient
 from isc.server_common.auth_command import auth_loadzone_command
 import select
+import time
 import errno
 
 from isc.log_messages.ddns_messages import *
@@ -67,24 +69,22 @@ else:
     SPECFILE_PATH = SPECFILE_PATH.replace("${prefix}", PREFIX)
 
 if "B10_FROM_BUILD" in os.environ:
-    AUTH_SPECFILE_PATH = os.environ["B10_FROM_BUILD"] + "/src/bin/auth"
     if "B10_FROM_SOURCE_LOCALSTATEDIR" in os.environ:
         SOCKET_FILE_PATH = os.environ["B10_FROM_SOURCE_LOCALSTATEDIR"]
     else:
         SOCKET_FILE_PATH = os.environ["B10_FROM_BUILD"]
 else:
     SOCKET_FILE_PATH = bind10_config.DATA_PATH
-    AUTH_SPECFILE_PATH = SPECFILE_PATH
 
 SPECFILE_LOCATION = SPECFILE_PATH + "/ddns.spec"
 SOCKET_FILE = SOCKET_FILE_PATH + '/ddns_socket'
-AUTH_SPECFILE_LOCATION = AUTH_SPECFILE_PATH + '/auth.spec'
 
-isc.util.process.rename()
-
-# Cooperating modules
-XFROUT_MODULE_NAME = 'Xfrout'
+# Cooperating or dependency modules
 AUTH_MODULE_NAME = 'Auth'
+XFROUT_MODULE_NAME = 'Xfrout'
+ZONEMGR_MODULE_NAME = 'Zonemgr'
+
+isc.util.process.rename()
 
 class DDNSConfigError(Exception):
     '''An exception indicating an error in updating ddns configuration.
@@ -143,15 +143,23 @@ def get_datasrc_client(cc_session):
         file = os.environ["B10_FROM_BUILD"] + "/bind10_zones.sqlite3"
     datasrc_config = '{ "database_file": "' + file + '"}'
     try:
-        return HARDCODED_DATASRC_CLASS, DataSourceClient('sqlite3',
-                                                         datasrc_config)
+        return (HARDCODED_DATASRC_CLASS,
+                DataSourceClient('sqlite3', datasrc_config), file)
     except isc.datasrc.Error as ex:
         class DummyDataSourceClient:
             def __init__(self, ex):
                 self.__ex = ex
             def find_zone(self, zone_name):
                 raise isc.datasrc.Error(self.__ex)
-        return HARDCODED_DATASRC_CLASS, DummyDataSourceClient(ex)
+        return (HARDCODED_DATASRC_CLASS, DummyDataSourceClient(ex), file)
+
+def add_pause(sec):
+    '''Pause a specified period for inter module synchronization.
+
+    This is a trivial wrapper of time.sleep, but defined as a separate function
+    so tests can customize it.
+    '''
+    time.sleep(sec)
 
 class DDNSServer:
     # The number of TCP clients that can be handled by the server at the same
@@ -181,8 +189,23 @@ class DDNSServer:
             self._cc.get_default_value('zones'))
         self._cc.start()
 
+        # Internal attributes derived from other modules.  They will be
+        # initialized via dd_remote_xxx below and will be kept updated
+        # through their callbacks.  They are defined as 'protected' so tests
+        # can examine them; but they are essentially private to the class.
+        #
+        # Datasource client used for handling update requests: when set,
+        # should a tuple of RRClass and DataSourceClient.  Constructed and
+        # maintained based on auth configuration.
+        self._datasrc_info = None
+        # A set of secondary zones, retrieved from zonemgr configuration.
+        self._secondary_zones = None
+
         # Get necessary configurations from remote modules.
-        self._cc.add_remote_config(AUTH_SPECFILE_LOCATION)
+        for mod in [(AUTH_MODULE_NAME, self.__auth_config_handler),
+                    (ZONEMGR_MODULE_NAME, self.__zonemgr_config_handler)]:
+            self.__add_remote_module(mod[0], mod[1])
+        # This should succeed as long as cfgmgr is up.
         isc.server_common.tsig_keyring.init_keyring(self._cc)
 
         self._shutdown = False
@@ -256,6 +279,88 @@ class DDNSServer:
             answer = create_answer(1, "Unknown command: " + str(cmd))
         return answer
 
+    def __add_remote_module(self, mod_name, callback):
+        '''Register interest in other module's config with a callback.'''
+
+        # Due to startup timing, add_remote_config can fail.  We could make it
+        # more sophisticated, but for now we simply retry a few times, each
+        # separated by a short period (3 times and 1 sec, arbitrary chosen,
+        # and hardcoded for now).  In practice this should be more than
+        # sufficient, but if it turns out to be a bigger problem we can
+        # consider more elegant solutions.
+        for n_try in range(0, 3):
+            try:
+                # by_name() version can fail with ModuleSpecError in getting
+                # the module spec because cfgmgr returns a "successful" answer
+                # with empty data if it cannot find the specified module.
+                # This seems to be a deviant behavior (see Trac #2039), but
+                # we need to deal with it.
+                self._cc.add_remote_config_by_name(mod_name, callback)
+                return
+            except (ModuleSpecError, ModuleCCSessionError) as ex:
+                logger.warn(DDNS_GET_REMOTE_CONFIG_FAIL, mod_name, n_try + 1,
+                            ex)
+                last_ex = ex
+                add_pause(1)
+        raise last_ex
+
+    def __auth_config_handler(self, new_config, module_config):
+        logger.info(DDNS_RECEIVED_AUTH_UPDATE)
+
+        # If we've got the config before and the new config doesn't update
+        # the DB file, there's nothing we should do with it.
+        # Note: there seems to be a bug either in bindctl or cfgmgr, and
+        # new_config can contain 'database_file' even if it's not really
+        # updated.  We still perform the check so we can avoid redundant
+        # resetting when the bug is fixed.  The redundant reset itself is not
+        # good, but such configuration update should not happen so often and
+        # it should be acceptable in practice.
+        if self._datasrc_info is not None and \
+                not 'database_file' in new_config:
+            return
+        rrclass, client, db_file = get_datasrc_client(self._cc)
+        self._datasrc_info = (rrclass, client)
+        logger.info(DDNS_AUTH_DBFILE_UPDATE, db_file)
+
+    def __zonemgr_config_handler(self, new_config, module_config):
+        logger.info(DDNS_RECEIVED_ZONEMGR_UPDATE)
+
+        # If we've got the config before and the new config doesn't update
+        # the secondary zone list, there's nothing we should do with it.
+        # (Same note as that for auth's config applies)
+        if self._secondary_zones is not None and \
+                not 'secondary_zones' in new_config:
+            return
+
+        # Get the latest secondary zones.  Use get_remote_config_value() so
+        # it can work for both the initial default case and updates.
+        sec_zones, _ = self._cc.get_remote_config_value(ZONEMGR_MODULE_NAME,
+                                                        'secondary_zones')
+        new_secondary_zones = set()
+        try:
+            # Parse the new config and build a new list of secondary zones.
+            # Unfortunately, in the current implementation, even an observer
+            # module needs to perform full validation.  This should be changed
+            # so that only post-validation (done by the main module) config is
+            # delivered to observer modules, but until it's supported we need
+            # to protect ourselves.
+            for zone_spec in sec_zones:
+                zname = Name(zone_spec['name'])
+                # class has the default value in case it's unspecified.
+                # ideally this should be merged within the config module, but
+                # the current implementation doesn't esnure that, so we need to
+                # subsitute it ourselves.
+                if 'class' in zone_spec:
+                    zclass = RRClass(zone_spec['class'])
+                else:
+                    zclass = RRClass(module_config.get_default_value(
+                            'secondary_zones/class'))
+                new_secondary_zones.add((zname, zclass))
+            self._secondary_zones = new_secondary_zones
+            logger.info(DDNS_SECONDARY_ZONES_UPDATE, len(self._secondary_zones))
+        except Exception as ex:
+            logger.error(DDNS_SECONDARY_ZONES_UPDATE_FAIL, ex)
+
     def trigger_shutdown(self):
         '''Initiate a shutdown sequence.
 
@@ -273,10 +378,13 @@ class DDNSServer:
         Perform any cleanup that is necessary when shutting down the server.
         Do NOT call this to initialize shutdown, use trigger_shutdown().
 
-        Currently, it only causes the ModuleCCSession to send a message that
-        this module is stopping.
         '''
+        # tell the ModuleCCSession to send a message that this module is
+        # stopping.
         self._cc.send_stopping()
+        # make sure any open socket is explicitly closed, per Python
+        # convention.
+        self._listen_socket.close()
 
     def accept(self):
         """
@@ -366,9 +474,8 @@ class DDNSServer:
         # Let an update session object handle the request.  Note: things around
         # ZoneConfig will soon be substantially revised.  For now we don't
         # bother to generalize it.
-        datasrc_class, datasrc_client = get_datasrc_client(self._cc)
-        zone_cfg = ZoneConfig([], datasrc_class, datasrc_client,
-                              self._zone_config)
+        zone_cfg = ZoneConfig(self._secondary_zones, self._datasrc_info[0],
+                              self._datasrc_info[1], self._zone_config)
         update_session = self._UpdateSessionClass(self.__request_msg,
                                                   remote_addr, zone_cfg)
         result, zname, zclass = update_session.handle()
@@ -605,7 +712,7 @@ def main(ddns_server=None):
         logger.info(DDNS_STOPPED_BY_KEYBOARD)
     except SessionError as e:
         logger.error(DDNS_CC_SESSION_ERROR, str(e))
-    except ModuleCCSessionError as e:
+    except (ModuleSpecError, ModuleCCSessionError) as e:
         logger.error(DDNS_MODULECC_SESSION_ERROR, str(e))
     except DDNSConfigError as e:
         logger.error(DDNS_CONFIG_ERROR, str(e))

src/bin/ddns/ddns_messages.mes

@@ -25,6 +25,12 @@ There was a low-level error when we tried to accept an incoming connection
 connections we already have, but this connection is dropped. The reason
 is logged.
 
+% DDNS_AUTH_DBFILE_UPDATE updated auth DB file to %1
+b10-ddns was notified of updates to the SQLite3 DB file that b10-auth
+uses for the underlying data source and on which b10-ddns needs to
+make updates.  b10-ddns then updated its internal setup so further
+updates would be made on the new DB.
+
 % DDNS_CC_SESSION_ERROR error reading from cc channel: %1
 There was a problem reading from the command and control channel. The
 most likely cause is that the msgq process is not running.
@@ -53,6 +59,29 @@ authoritative server shuts down, the connection would get closed. It also
 can mean the system is busy and can't keep up or that the other side got
 confused and sent bad data.
 
+% DDNS_GET_REMOTE_CONFIG_FAIL failed to get %1 module configuration %2 times: %3
+b10-ddns tried to get configuration of some remote modules for its
+operation, but it failed.  The most likely cause of this is that the
+remote module has not fully started up and b10-ddns couldn't get the
+configuration in a timely fashion.  b10-ddns attempts to retry it a
+few times, imposing a short delay, hoping it eventually succeeds if
+it's just a timing issue.  The number of total failed attempts is also
+logged.  If it reaches an internal threshold b10-ddns considers it a
+fatal error and terminates.  Even in that case, if b10-ddns is
+configured as a "dispensable" component (which is the default), the
+parent bind10 process will restart it, and there will be another
+chance of getting the remote configuration successfully.  These are
+not the optimal behavior, but it's believed to be sufficient in
+practice (there would normally be no failure in the first place).  If
+it really causes an operational trouble other than having a few of
+these log messages, please submit a bug report; there can be several
+ways to make it more sophisticated.  Another, less likely reason for
+having this error is because the remote modules are not actually
+configured to run.  If that's the case fixing the configuration should
+solve the problem - either by making sure the remote module will run
+or by not running b10-ddns (without these remote modules b10-ddns is
+not functional, so there's no point in running it in this case).
+
 % DDNS_MODULECC_SESSION_ERROR error encountered by configuration/command module: %1
 There was a problem in the lower level module handling configuration and
 control commands.  This could happen for various reasons, but the most likely
@@ -66,10 +95,21 @@ requests from it. The file descriptor number and the address where the request
 comes from is logged. The connection is over a unix domain socket and is likely
 coming from a b10-auth process.
 
+% DDNS_RECEIVED_AUTH_UPDATE received configuration updates from auth server
+b10-ddns is notified of updates to b10-auth configuration
+(including a report of the initial configuration) that b10-ddns might
+be interested in.
+
 % DDNS_RECEIVED_SHUTDOWN_COMMAND shutdown command received
 The ddns process received a shutdown command from the command channel
 and will now shut down.
 
+% DDNS_RECEIVED_ZONEMGR_UPDATE received configuration updates from zonemgr
+b10-ddns is notified of updates to b10-zonemgr's configuration
+(including a report of the initial configuration).  It may possibly
+contain changes to the secondary zones, in which case b10-ddns will
+update its internal copy of that configuration.
+
 % DDNS_REQUEST_PARSE_FAIL failed to parse update request: %1
 b10-ddns received an update request via b10-auth, but the received
 data failed to pass minimum validation: it was either broken wire
@@ -117,6 +157,31 @@ with the client address.
 The ddns process has successfully started and is now ready to receive commands
 and updates.
 
+% DDNS_SECONDARY_ZONES_UPDATE updated secondary zone list (%1 zones are listed)
+b10-ddns has successfully updated the internal copy of secondary zones
+obtained from b10-zonemgr, based on a latest update to zonemgr's
+configuration.  The number of newly configured (unique) secondary
+zones is logged.
+
+% DDNS_SECONDARY_ZONES_UPDATE_FAIL failed to update secondary zone list: %1
+An error message.  b10-ddns was notified of updates to a list of
+secondary zones from b10-zonemgr and tried to update its own internal
+copy of the list, but it failed.  This can happen if the configuration
+contains an error, and b10-zonemgr should also reject that update.
+Unfortunately, in the current implementation there is no way to ensure
+that both zonemgr and ddns have consistent information when an update
+contains an error; further, as of this writing zonemgr has a bug that
+it could partially update the list of secondary zones if part of the
+list has an error (see Trac ticket #2038).  b10-ddns still keeps
+running with the previous configuration, but it's strongly advisable
+to check log messages from zonemgr, and if it indicates there can be
+inconsistent state, it's better to restart the entire BIND 10 system
+(just restarting b10-ddns wouldn't be enough, because zonemgr can have
+partially updated configuration due to bug #2038).  The log message
+contains an error description, but it's intentionally kept simple as
+it's primarily a matter of zonemgr.  To know the details of the error,
+log messages of zonemgr should be consulted.
+
 % DDNS_SESSION session arrived on file descriptor %1
 A debug message, informing there's some activity on the given file descriptor.
 It will be either a request or the file descriptor will be closed. See

src/bin/ddns/tests/ddns_test.py

@@ -21,7 +21,10 @@ from isc.acl.acl import ACCEPT
 import isc.util.cio.socketsession
 from isc.cc.session import SessionTimeout, SessionError, ProtocolError
 from isc.datasrc import DataSourceClient
-from isc.config.ccsession import create_answer
+from isc.config import module_spec_from_file
+from isc.config.config_data import ConfigData
+from isc.config.ccsession import create_answer, ModuleCCSessionError
+from isc.config.module_spec import ModuleSpecError
 from isc.server_common.dns_tcp import DNSTCPContext
 import ddns
 import errno
@@ -56,6 +59,11 @@ TEST_TSIG_KEYRING.add(TEST_TSIG_KEY)
 # Another TSIG key not in the keyring, making verification fail
 BAD_TSIG_KEY = TSIGKey("example.com:SFuWd/q99SzF8Yzd1QbB9g==")
 
+# Incorporate it so we can use the real default values of zonemgr config
+# in the tests.
+ZONEMGR_MODULE_SPEC = module_spec_from_file(
+    os.environ["B10_FROM_BUILD"] + "/src/bin/zonemgr/zonemgr.spec")
+
 class FakeSocket:
     """
     A fake socket. It only provides a file number, peer name and accept method.
@@ -208,6 +216,13 @@ class MyCCSession(isc.config.ConfigData):
         self._sendmsg_exception = None # will be raised from sendmsg if !None
         self._recvmsg_exception = None # will be raised from recvmsg if !None
 
+        # Attributes to handle (faked) remote configurations
+        self.__callbacks = {}   # record callbacks for updates to remote confs
+        self._raise_mods = {}  # map of module to exceptions to be triggered
+                               # on add_remote.  settable by tests.
+        self._auth_config = {}  # faked auth cfg, settable by tests
+        self._zonemgr_config = {} # faked zonemgr cfg, settable by tests
+
     def start(self):
         '''Called by DDNSServer initialization, but not used in tests'''
         self._started = True
@@ -222,8 +237,27 @@ class MyCCSession(isc.config.ConfigData):
         """
         return FakeSocket(1)
 
-    def add_remote_config(self, spec_file_name):
-        pass
+    def add_remote_config_by_name(self, module_name, update_callback=None):
+        # If a list of exceptions is given for the module, raise the front one,
+        # removing that exception from the list (so the list length controls
+        # how many (and which) exceptions should be raised on add_remote).
+        if module_name in self._raise_mods.keys() and \
+                len(self._raise_mods[module_name]) != 0:
+            ex = self._raise_mods[module_name][0]
+            self._raise_mods[module_name] = self._raise_mods[module_name][1:]
+            raise ex('Failure requesting remote config data')
+
+        if update_callback is not None:
+            self.__callbacks[module_name] = update_callback
+        if module_name is 'Auth':
+            if module_name in self.__callbacks:
+                # ddns implementation doesn't use the 2nd element, so just
+                # setting it to None
+                self.__callbacks[module_name](self._auth_config, None)
+        if module_name is 'Zonemgr':
+            if module_name in self.__callbacks:
+                self.__callbacks[module_name](self._zonemgr_config,
+                                              ConfigData(ZONEMGR_MODULE_SPEC))
 
     def get_remote_config_value(self, module_name, item):
         if module_name == "Auth" and item == "database_file":
@@ -233,6 +267,14 @@ class MyCCSession(isc.config.ConfigData):
                 return [], True # default
             else:
                 return self.auth_datasources, False
+        if module_name == 'Zonemgr' and item == 'secondary_zones':
+            if item in self._zonemgr_config:
+                return self._zonemgr_config[item], False
+            else:
+                seczone_default = \
+                    ConfigData(ZONEMGR_MODULE_SPEC).get_default_value(
+                    'secondary_zones')
+                return seczone_default, True
 
     def group_sendmsg(self, msg, group):
         # remember the passed parameter, and return dummy sequence
@@ -299,6 +341,10 @@ class TestDDNSServer(unittest.TestCase):
         self.__select_answer = None
         self.__select_exception = None
         self.__hook_called = False
+        # Because we overwrite the _listen_socket, close any existing
+        # socket object.
+        if self.ddns_server._listen_socket is not None:
+            self.ddns_server._listen_socket.close()
         self.ddns_server._listen_socket = FakeSocket(2)
         ddns.select.select = self.__select
 
@@ -306,12 +352,15 @@ class TestDDNSServer(unittest.TestCase):
         self.__tcp_sock = FakeSocket(10, socket.IPPROTO_TCP)
         self.__tcp_ctx = DNSTCPContext(self.__tcp_sock)
         self.__tcp_data = b'A' * 12 # dummy, just the same size as DNS header
+        # some tests will override this, which will be restored in tearDown:
+        self.__orig_add_pause = ddns.add_pause
 
     def tearDown(self):
         ddns.select.select = select.select
         ddns.isc.util.cio.socketsession.SocketSessionReceiver = \
             isc.util.cio.socketsession.SocketSessionReceiver
         isc.server_common.tsig_keyring = self.orig_tsig_keyring
+        ddns.add_pause = self.__orig_add_pause
 
     def test_listen(self):
         '''
@@ -334,6 +383,9 @@ class TestDDNSServer(unittest.TestCase):
         # Now make sure the clear_socket really works
         ddns.clear_socket()
         self.assertFalse(os.path.exists(ddns.SOCKET_FILE))
+        # Let ddns object complete any necessary cleanup (not part of the test,
+        # but for suppressing any warnings from the Python interpreter)
+        ddnss.shutdown_cleanup()
 
     def test_initial_config(self):
         # right now, the only configuration is the zone configuration, whose
@@ -422,6 +474,112 @@ class TestDDNSServer(unittest.TestCase):
         acl = self.ddns_server._zone_config[(TEST_ZONE_NAME, TEST_RRCLASS)]
         self.assertEqual(ACCEPT, acl.execute(TEST_ACL_CONTEXT))
 
+    def test_datasrc_config(self):
+        # By default (in our faked config) it should be derived from the
+        # test data source
+        rrclass, datasrc_client = self.ddns_server._datasrc_info
+        self.assertEqual(RRClass.IN(), rrclass)
+        self.assertEqual(DataSourceClient.SUCCESS,
+                         datasrc_client.find_zone(Name('example.org'))[0])
+
+        # emulating an update.  calling add_remote_config_by_name is a
+        # convenient faked way to invoke the callback.  We set the db file
+        # to a bogus one; the current implementation will create an unusable
+        # data source client.
+        self.__cc_session.auth_db_file = './notexistentdir/somedb.sqlite3'
+        self.__cc_session._auth_config = \