[4204] Remove runtime option defs if "option-def" is not in config.

src/bin/dhcp4/json_config_parser.cc

@@ -515,6 +515,9 @@ configureDhcp4Server(Dhcpv4Srv&, isc::data::ConstElementPtr config_set) {
 
     // Revert any runtime option definitions configured so far and not committed.
     LibDHCP::revertRuntimeOptionDefs();
+    // Let's set empty container in case a user hasn't specified any configuration
+    // for option definitions. This is equivalent to commiting empty container.
+    LibDHCP::setRuntimeOptionDefs(OptionDefSpaceContainer());
 
     // Some of the values specified in the configuration depend on
     // other values. Typically, the values in the subnet4 structure

src/bin/dhcp4/tests/config_parser_unittest.cc

@@ -1346,6 +1346,11 @@ TEST_F(Dhcp4ParserTest, optionDefIpv4Address) {
     ASSERT_TRUE(status);
     checkResult(status, 0);
 
+    // We need to commit option definitions because later in this test we
+    // will be checking if they get removed when "option-def" parameter
+    // is removed from a configuration.
+    LibDHCP::commitRuntimeOptionDefs();
+
     // The option definition should now be available in the CfgMgr.
     def = CfgMgr::instance().getStagingCfg()->getCfgOptionDef()->get("isc", 100);
     ASSERT_TRUE(def);
@@ -1365,6 +1370,16 @@ TEST_F(Dhcp4ParserTest, optionDefIpv4Address) {
     // be equal.
     EXPECT_TRUE(def_libdhcp != def);
     EXPECT_TRUE(*def_libdhcp == *def);
+
+    // Let's apply empty configuration. This removes the option definitions
+    // configuration and should result in removal of the option 100 from the
+    // libdhcp++.
+    config = "{ }";
+    json = Element::fromJSON(config);
+    ASSERT_NO_THROW(status = configureDhcp4Server(*srv_, json));
+    checkResult(status, 0);
+
+    EXPECT_FALSE(LibDHCP::getRuntimeOptionDef("isc", 100));
 }
 
 // The goal of this test is to check whether an option definition

src/bin/dhcp6/json_config_parser.cc

@@ -754,6 +754,9 @@ configureDhcp6Server(Dhcpv6Srv&, isc::data::ConstElementPtr config_set) {
 
     // Revert any runtime option definitions configured so far and not committed.
     LibDHCP::revertRuntimeOptionDefs();
+    // Let's set empty container in case a user hasn't specified any configuration
+    // for option definitions. This is equivalent to commiting empty container.
+    LibDHCP::setRuntimeOptionDefs(OptionDefSpaceContainer());
 
     // Some of the values specified in the configuration depend on
     // other values. Typically, the values in the subnet6 structure

src/bin/dhcp6/tests/config_parser_unittest.cc

@@ -1583,6 +1583,12 @@ TEST_F(Dhcp6ParserTest, optionDefIpv6Address) {
     ConstElementPtr status;
     EXPECT_NO_THROW(status = configureDhcp6Server(srv_, json));
     ASSERT_TRUE(status);
+    checkResult(status, 0);
+
+    // We need to commit option definitions because later in this test we
+    // will be checking if they get removed when "option-def" parameter
+    // is removed from a configuration.
+    LibDHCP::commitRuntimeOptionDefs();
 
     // The option definition should now be available in the CfgMgr.
     def = CfgMgr::instance().getStagingCfg()->getCfgOptionDef()->get("isc", 100);
@@ -1602,6 +1608,16 @@ TEST_F(Dhcp6ParserTest, optionDefIpv6Address) {
     // be equal.
     EXPECT_TRUE(def_libdhcp != def);
     EXPECT_TRUE(*def_libdhcp == *def);
+
+    // Let's apply empty configuration. This removes the option definitions
+    // configuration and should result in removal of the option 100 from the
+    // libdhcp++.
+    config = "{ }";
+    json = Element::fromJSON(config);
+    ASSERT_NO_THROW(status = configureDhcp6Server(srv_, json));
+    checkResult(status, 0);
+
+    EXPECT_FALSE(LibDHCP::getRuntimeOptionDef("isc", 100));
 }
 
 // The goal of this test is to check whether an option definition