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[393-global-search-through-leases-by-mac-or-hostname-w-o-specifying-a-subnet-id] Added get leases 4 and 4 by hostname to the API

src/lib/dhcpsrv/dhcpsrv_messages.*
    DHCPSRV_CFGMGR_DDNS_PARAMETER_IGNORED
    DHCPSRV_CFGMGR_DDNS_PARAMETER_MOVED

src/lib/dhcpsrv/srv_config.*
    SrvConfig::moveDdnsParams() - new method to move
    parameters from dhcp-ddns to configured globals.

src/lib/dhcpsrv/tests/srv_config_unittest.cc
    TEST_F(SrvConfigTest, moveDdnsParamsTest) - new test

[685-log-the-expected-subnet-id-as-well-as-the-actual-subnet-id-when-the-sanity-checker-identifies-a-problem] Improved SanityChecker logs

Francis Dupont authored Mar 08, 2019 and Tomek Mrugalski committed Apr 19, 2019

[465-add-subnet4-update-and-subnet6-update-commands-to-subnet-cmds-hook] Added cfg_subnet replace -- unit test to do

    Infrastructure has been added to kea-dhcp6 such that it can
    now be configured to fetch full and then periodic updates
    from config backends.

    Merging the actual fetched content will be done under subsequent
    issues.

src/bin/dhcp6
    ctrl_dhcp6_srv.*
        - ControlledDhcpv6Srv::processConfig() - added logic to schedule CB update timer
        - ControlledDhcpv6Srv::cbFetchUpdates() - new callback function for CB updates

    dhcp6_lexer.ll
    dhcp6_parser.yy
        -  Added config-fetch-wait-time

    dhcp6_messages.mes
        -  New log messages

    dhcp6_srv.*
        - Dhcpv6Srv::cb_control_  - new member for config backend access
        - Dhcpv6Srv::inTestMode() - new function to test for unit test mode

    json_config_parser.cc
        - configureDhcp6Server() - invokes full fetch from config backend

src/bin/dhcp6/tests
    config_backend_unittest.cc - new file/tests for config backend testing
    config_parser_unittest.cc - updated
    get_config_unittest.cc - rebuild tests
    kea_controller_unittest.cc - added CB control/timer tests

src/lib/dhcpsrv/
    dhcpsrv_messages.mes - added log message
	cb_ctl_dhcp6.* - new files that provide v6 impl of config backend controller

doc/examples/kea6/all-keys-current.json - added config-fetch-wait-time

mayya authored Jun 10, 2018 and Tomek Mrugalski committed Jul 23, 2018

 See issue #83

Except Cassandra.

    src/lib/dhcpsrv/mysql_connection.h
        MySqlConnection::checkError<>() - modified to invoke
        db lost callback

    src/lib/dhcpsrv/dhcpsrv_messages.mes
        Updated log messages

    src/lib/dhcpsrv/mysql_lease_mgr.cc
        MySqlLeaseMgr::getVersion() - updated to use checkError()

    src/lib/dhcpsrv/pgsql_connection.*
        PgSqlResult::PgSqlResult(PGresult *result) - now supports
        construction with null PGresult. This is to accomodate rare
        cases when PQ* statements can return NULL.

    src/lib/dhcpsrv/tests/generic_lease_mgr_unittest.*
        class LeaseMgrDbLostCallbackTest - new test fixture for
        testing LeaseMgr DBLostCallback behavior

    src/lib/dhcpsrv/tests/host_mgr_unittest.cc
        class HostMgrDbLostCallbackTest
        class MySQLHostMgrDbLostCallbackTest
        class PostgreSQLHostMgrDbLostCallbackTest
        - new test fixtures for testing HostMgr DBLostCallback behavior

    src/lib/dhcpsrv/tests/mysql_lease_mgr_unittest.cc
        class MySQLLeaseMgrDbLostCallbackTest - new test fixture for
        testing MySQL LeaseMgr DBLostCallback behavior

    src/lib/dhcpsrv/tests/pgsql_lease_mgr_unittest.cc
        class PgSqlLeaseMgrDbLostCallbackTest - new test fixture for
        testing Postgresql LeaseMgr DBLostCallback behavior

    src/lib/dhcpsrv/tests/test_utils.*
        int findLastSocketFd() - new function used for finding what
        should be the fd of the SQL client socket

    doc/guide/dhcp4-srv.xml
    doc/guide/dhcp6-srv.xml
        Updated lease and host database parameter sections

This change affects Memfile, MySQL and Postgres backend. These functions
aren't implemented for CQL at this time.

- replaced void* with boost::any for type safety (might be just a bit less efficient)
- replaced a multi-index-container used for statement parameters ( with position index and name index ) and a vector of the same parameters with a compile-time type-based map
- refactored lease manager to use exchanges
- exchanges now support UDTs (user defined types) and collections to be used in Cassandra statements
- replaced size-ambiguous types (e.g. int) with size-explicit types (e.g. int32_t) in Cassandra-related code
- made exception messages and log messages more detailed and consistent in format