From: Razvan Becheriu <razvan@isc.org>
Date: Mon, 11 May 2026 14:12:46 +0000 (+0300)
Subject: [#3144] addressed review comments
X-Git-Tag: Kea-3.1.9~57
X-Git-Url: http://git.ipfire.org/gitweb/index.cgi?a=commitdiff_plain;h=97ef75cce274b641277f52c987bbca83005bb876;p=thirdparty%2Fkea.git

[#3144] addressed review comments
---

diff --git a/src/bin/dhcp4/ctrl_dhcp4_srv.cc b/src/bin/dhcp4/ctrl_dhcp4_srv.cc
index 2f4678702a..59131d78e2 100644
--- a/src/bin/dhcp4/ctrl_dhcp4_srv.cc
+++ b/src/bin/dhcp4/ctrl_dhcp4_srv.cc
@@ -680,17 +680,20 @@ ConstElementPtr
 ControlledDhcpv4Srv::commandInterfaceListHandler(const std::string&,
                                                  ConstElementPtr) {
     ElementPtr ifaces = Element::createMap();
+    bool error = false;
     std::string message;
     try {
         ifaces->set("interfaces", IfaceMgr::instance().ifacesToElement());
-    } catch (std::exception& ex) {
+    } catch (const std::exception& ex) {
+        error = true;
         message = ex.what();
     } catch (...) {
+        error = true;
         message = "unknown error";
     }
 
     ostringstream msg;
-    if (message.empty()) {
+    if (!error) {
         msg << IfaceMgr::instance().getIfaces().size()
             << " interfaces detected.";
         return (isc::config::createAnswer(CONTROL_RESULT_SUCCESS, msg.str(), ifaces));
@@ -703,17 +706,20 @@ ControlledDhcpv4Srv::commandInterfaceListHandler(const std::string&,
 ConstElementPtr
 ControlledDhcpv4Srv::commandInterfaceRedetectHandler(const std::string&,
                                                      ConstElementPtr args) {
+    bool error = false;
     std::string message;
     try {
         IfaceMgr::instance().detectIfaces(true);
-    } catch (std::exception& ex) {
+    } catch (const std::exception& ex) {
+        error = true;
         message = ex.what();
     } catch (...) {
+        error = true;
         message = "unknown error";
     }
 
     ostringstream msg;
-    if (message.empty()) {
+    if (!error) {
         return (ControlledDhcpv4Srv::commandInterfaceListHandler("", args));
     } else {
         msg << "Unexpected error while retrieving the list of detected interfaces: " << message;
@@ -724,6 +730,7 @@ ControlledDhcpv4Srv::commandInterfaceRedetectHandler(const std::string&,
 ConstElementPtr
 ControlledDhcpv4Srv::commandInterfaceUseHandler(const std::string&,
                                                 ConstElementPtr args) {
+    bool error = false;
     string message;
     ConstElementPtr ifaces_config;
     if (!args) {
@@ -750,23 +757,24 @@ ControlledDhcpv4Srv::commandInterfaceUseHandler(const std::string&,
         return (isc::config::createAnswer(CONTROL_RESULT_ERROR, message));
     }
     try {
-        ElementPtr mutable_cfg = boost::const_pointer_cast<Element>(args);
-        mutable_cfg->set("re-detect", Element::create(false));
+        CfgIfacePtr running_cfg_iface = CfgMgr::instance().getCurrentCfg()->getCfgIface();
+        ElementPtr mutable_running_cfg = running_cfg_iface->toElement();
+        merge(mutable_running_cfg, args);
         IfacesConfigParser parser(AF_INET, true);
         CfgIfacePtr cfg_iface(new CfgIface());
-        parser.parse(cfg_iface, args);
-        CfgIfacePtr running_cfg_iface = CfgMgr::instance().getCurrentCfg()->getCfgIface();
-        if (running_cfg_iface->merge(*cfg_iface, AF_INET)) {
-            running_cfg_iface->triggerOpenSocketsWithRetry(AF_INET, getServerPort(), useBroadcast());
-        }
-    } catch (std::exception& ex) {
+        parser.parseInterfacesList(cfg_iface, mutable_running_cfg->get("interfaces"));
+        CfgMgr::instance().getCurrentCfg()->getCfgIface()->update(*cfg_iface);
+        running_cfg_iface->triggerOpenSocketsWithRetry(AF_INET, getServerPort(), useBroadcast());
+    } catch (const std::exception& ex) {
+        error = true;
         message = ex.what();
     } catch (...) {
+        error = true;
         message = "unknown error";
     }
 
     ostringstream msg;
-    if (message.empty()) {
+    if (!error) {
         return (isc::config::createAnswer(CONTROL_RESULT_SUCCESS, "Configuration successful."));
     } else {
         msg << "Unexpected error while updating used interfaces: " << message;
diff --git a/src/bin/dhcp4/tests/ctrl_dhcp4_srv_unittest.cc b/src/bin/dhcp4/tests/ctrl_dhcp4_srv_unittest.cc
index f4ee1317a6..7d2abbfbed 100644
--- a/src/bin/dhcp4/tests/ctrl_dhcp4_srv_unittest.cc
+++ b/src/bin/dhcp4/tests/ctrl_dhcp4_srv_unittest.cc
@@ -17,6 +17,7 @@
 #include <dhcp/dhcp4.h>
 #include <dhcp/libdhcp++.h>
 #include <dhcp/testutils/iface_mgr_test_config.h>
+#include <dhcp/testutils/pkt_filter_test_stub.h>
 #include <dhcpsrv/cfgmgr.h>
 #include <dhcpsrv/host_mgr.h>
 #include <dhcpsrv/lease.h>
@@ -2447,6 +2448,8 @@ TEST_F(CtrlChannelDhcpv4SrvTest, interfaceList) {
     IfaceMgr::instance().closeSockets();
     IfaceMgr::instance().detectIfaces();
     createUnixChannelServer();
+    PktFilterPtr filter(new PktFilterTestStub());
+    IfaceMgr::instance().setPacketFilter(filter);
     SKIP_IF(skipped_);
     std::string response;
 
@@ -2490,6 +2493,8 @@ TEST_F(CtrlChannelDhcpv4SrvTest, interfaceRedetect) {
     IfaceMgr::instance().closeSockets();
     IfaceMgr::instance().detectIfaces();
     createUnixChannelServer();
+    PktFilterPtr filter(new PktFilterTestStub());
+    IfaceMgr::instance().setPacketFilter(filter);
     SKIP_IF(skipped_);
     std::string response;
 
@@ -2569,6 +2574,8 @@ TEST_F(CtrlChannelDhcpv4SrvTest, interfaceUse) {
     IfaceMgr::instance().closeSockets();
     IfaceMgr::instance().detectIfaces();
     createUnixChannelServer();
+    PktFilterPtr filter(new PktFilterTestStub());
+    IfaceMgr::instance().setPacketFilter(filter);
     SKIP_IF(skipped_);
     std::string response;
 
diff --git a/src/bin/dhcp4/tests/http_control_socket_unittest.cc b/src/bin/dhcp4/tests/http_control_socket_unittest.cc
index 186c9789b6..c01a478e83 100644
--- a/src/bin/dhcp4/tests/http_control_socket_unittest.cc
+++ b/src/bin/dhcp4/tests/http_control_socket_unittest.cc
@@ -17,6 +17,7 @@
 #include <dhcp/dhcp4.h>
 #include <dhcp/libdhcp++.h>
 #include <dhcp/testutils/iface_mgr_test_config.h>
+#include <dhcp/testutils/pkt_filter_test_stub.h>
 #include <dhcpsrv/cfgmgr.h>
 #include <dhcpsrv/host_mgr.h>
 #include <dhcpsrv/lease.h>
@@ -3657,6 +3658,8 @@ BaseCtrlChannelDhcpv4Test::testInterfaceList() {
     IfaceMgr::instance().closeSockets();
     IfaceMgr::instance().detectIfaces();
     createHttpChannelServer();
+    PktFilterPtr filter(new PktFilterTestStub());
+    IfaceMgr::instance().setPacketFilter(filter);
     std::string response;
 
     std::string command = "{ \"command\": \"interface-list\" }";
@@ -3708,6 +3711,8 @@ BaseCtrlChannelDhcpv4Test::testInterfaceRedetect() {
     IfaceMgr::instance().closeSockets();
     IfaceMgr::instance().detectIfaces();
     createHttpChannelServer();
+    PktFilterPtr filter(new PktFilterTestStub());
+    IfaceMgr::instance().setPacketFilter(filter);
     std::string response;
 
     IfacePtr eth1 = IfaceMgrTestConfig::createIface("eth1", ETH1_INDEX,
@@ -3795,6 +3800,8 @@ BaseCtrlChannelDhcpv4Test::testInterfaceUse() {
     IfaceMgr::instance().closeSockets();
     IfaceMgr::instance().detectIfaces();
     createHttpChannelServer();
+    PktFilterPtr filter(new PktFilterTestStub());
+    IfaceMgr::instance().setPacketFilter(filter);
     std::string response;
 
     std::string command = "{ \"command\": \"interface-use\", \"arguments\": { \"interfaces\": [ \"eth0\" ] } }";
diff --git a/src/bin/dhcp6/ctrl_dhcp6_srv.cc b/src/bin/dhcp6/ctrl_dhcp6_srv.cc
index d373392e58..830f0c9144 100644
--- a/src/bin/dhcp6/ctrl_dhcp6_srv.cc
+++ b/src/bin/dhcp6/ctrl_dhcp6_srv.cc
@@ -683,17 +683,20 @@ ConstElementPtr
 ControlledDhcpv6Srv::commandInterfaceListHandler(const std::string&,
                                                  ConstElementPtr) {
     ElementPtr ifaces = Element::createMap();
+    bool error = false;
     std::string message;
     try {
         ifaces->set("interfaces", IfaceMgr::instance().ifacesToElement());
-    } catch (std::exception& ex) {
+    } catch (const std::exception& ex) {
+        error = true;
         message = ex.what();
     } catch (...) {
+        error = true;
         message = "unknown error";
     }
 
     ostringstream msg;
-    if (message.empty()) {
+    if (!error) {
         msg << IfaceMgr::instance().getIfaces().size()
             << " interfaces detected.";
         return (isc::config::createAnswer(CONTROL_RESULT_SUCCESS, msg.str(), ifaces));
@@ -706,17 +709,20 @@ ControlledDhcpv6Srv::commandInterfaceListHandler(const std::string&,
 ConstElementPtr
 ControlledDhcpv6Srv::commandInterfaceRedetectHandler(const std::string&,
                                                      ConstElementPtr args) {
+    bool error = false;
     std::string message;
     try {
         IfaceMgr::instance().detectIfaces(true);
-    } catch (std::exception& ex) {
+    } catch (const std::exception& ex) {
+        error = true;
         message = ex.what();
     } catch (...) {
+        error = true;
         message = "unknown error";
     }
 
     ostringstream msg;
-    if (message.empty()) {
+    if (!error) {
         return (ControlledDhcpv6Srv::commandInterfaceListHandler("", args));
     } else {
         msg << "Unexpected error while retrieving the list of detected interfaces: " << message;
@@ -727,6 +733,7 @@ ControlledDhcpv6Srv::commandInterfaceRedetectHandler(const std::string&,
 ConstElementPtr
 ControlledDhcpv6Srv::commandInterfaceUseHandler(const std::string&,
                                                 ConstElementPtr args) {
+    bool error = false;
     string message;
     ConstElementPtr ifaces_config;
     if (!args) {
@@ -753,23 +760,24 @@ ControlledDhcpv6Srv::commandInterfaceUseHandler(const std::string&,
         return (isc::config::createAnswer(CONTROL_RESULT_ERROR, message));
     }
     try {
-        ElementPtr mutable_cfg = boost::const_pointer_cast<Element>(args);
-        mutable_cfg->set("re-detect", Element::create(false));
+        CfgIfacePtr running_cfg_iface = CfgMgr::instance().getCurrentCfg()->getCfgIface();
+        ElementPtr mutable_running_cfg = running_cfg_iface->toElement();
+        merge(mutable_running_cfg, args);
         IfacesConfigParser parser(AF_INET6, true);
         CfgIfacePtr cfg_iface(new CfgIface());
-        parser.parse(cfg_iface, args);
-        CfgIfacePtr running_cfg_iface = CfgMgr::instance().getCurrentCfg()->getCfgIface();
-        if (running_cfg_iface->merge(*cfg_iface, AF_INET6)) {
-            running_cfg_iface->triggerOpenSocketsWithRetry(AF_INET6, getServerPort());
-        }
-    } catch (std::exception& ex) {
+        parser.parseInterfacesList(cfg_iface, mutable_running_cfg->get("interfaces"));
+        CfgMgr::instance().getCurrentCfg()->getCfgIface()->update(*cfg_iface);
+        running_cfg_iface->triggerOpenSocketsWithRetry(AF_INET6, getServerPort());
+    } catch (const std::exception& ex) {
+        error = true;
         message = ex.what();
     } catch (...) {
+        error = true;
         message = "unknown error";
     }
 
     ostringstream msg;
-    if (message.empty()) {
+    if (!error) {
         return (isc::config::createAnswer(CONTROL_RESULT_SUCCESS, "Configuration successful."));
     } else {
         msg << "Unexpected error while updating used interfaces: " << message;
diff --git a/src/bin/dhcp6/tests/ctrl_dhcp6_srv_unittest.cc b/src/bin/dhcp6/tests/ctrl_dhcp6_srv_unittest.cc
index 662a8947f0..2a6995c713 100644
--- a/src/bin/dhcp6/tests/ctrl_dhcp6_srv_unittest.cc
+++ b/src/bin/dhcp6/tests/ctrl_dhcp6_srv_unittest.cc
@@ -15,6 +15,7 @@
 #include <config/unix_command_mgr.h>
 #include <dhcp/libdhcp++.h>
 #include <dhcp/testutils/iface_mgr_test_config.h>
+#include <dhcp/testutils/pkt_filter6_test_stub.h>
 #include <dhcpsrv/cfgmgr.h>
 #include <dhcpsrv/host_mgr.h>
 #include <dhcpsrv/lease.h>
@@ -2441,6 +2442,8 @@ TEST_F(CtrlChannelDhcpv6SrvTest, interfaceList) {
     IfaceMgr::instance().closeSockets();
     IfaceMgr::instance().detectIfaces();
     createUnixChannelServer();
+    PktFilter6Ptr filter(new PktFilter6TestStub());
+    IfaceMgr::instance().setPacketFilter(filter);
     SKIP_IF(skipped_);
     std::string response;
 
@@ -2484,6 +2487,8 @@ TEST_F(CtrlChannelDhcpv6SrvTest, interfaceRedetect) {
     IfaceMgr::instance().closeSockets();
     IfaceMgr::instance().detectIfaces();
     createUnixChannelServer();
+    PktFilter6Ptr filter(new PktFilter6TestStub());
+    IfaceMgr::instance().setPacketFilter(filter);
     SKIP_IF(skipped_);
     std::string response;
 
@@ -2563,6 +2568,8 @@ TEST_F(CtrlChannelDhcpv6SrvTest, interfaceUse) {
     IfaceMgr::instance().closeSockets();
     IfaceMgr::instance().detectIfaces();
     createUnixChannelServer();
+    PktFilter6Ptr filter(new PktFilter6TestStub());
+    IfaceMgr::instance().setPacketFilter(filter);
     SKIP_IF(skipped_);
     std::string response;
 
diff --git a/src/bin/dhcp6/tests/http_control_socket_unittest.cc b/src/bin/dhcp6/tests/http_control_socket_unittest.cc
index 6b54f16109..5d66fa0f2d 100644
--- a/src/bin/dhcp6/tests/http_control_socket_unittest.cc
+++ b/src/bin/dhcp6/tests/http_control_socket_unittest.cc
@@ -16,6 +16,7 @@
 #include <database/database_connection.h>
 #include <dhcp/libdhcp++.h>
 #include <dhcp/testutils/iface_mgr_test_config.h>
+#include <dhcp/testutils/pkt_filter6_test_stub.h>
 #include <dhcpsrv/cfgmgr.h>
 #include <dhcpsrv/host_mgr.h>
 #include <dhcpsrv/lease.h>
@@ -3649,6 +3650,8 @@ BaseCtrlChannelDhcpv6Test::testInterfaceList() {
     IfaceMgr::instance().closeSockets();
     IfaceMgr::instance().detectIfaces();
     createHttpChannelServer();
+    PktFilter6Ptr filter(new PktFilter6TestStub());
+    IfaceMgr::instance().setPacketFilter(filter);
     std::string response;
 
     std::string command = "{ \"command\": \"interface-list\" }";
@@ -3700,6 +3703,8 @@ BaseCtrlChannelDhcpv6Test::testInterfaceRedetect() {
     IfaceMgr::instance().closeSockets();
     IfaceMgr::instance().detectIfaces();
     createHttpChannelServer();
+    PktFilter6Ptr filter(new PktFilter6TestStub());
+    IfaceMgr::instance().setPacketFilter(filter);
     std::string response;
 
     IfacePtr eth1 = IfaceMgrTestConfig::createIface("eth1", ETH1_INDEX,
@@ -3787,6 +3792,8 @@ BaseCtrlChannelDhcpv6Test::testInterfaceUse() {
     IfaceMgr::instance().closeSockets();
     IfaceMgr::instance().detectIfaces();
     createHttpChannelServer();
+    PktFilter6Ptr filter(new PktFilter6TestStub());
+    IfaceMgr::instance().setPacketFilter(filter);
     std::string response;
 
     std::string command = "{ \"command\": \"interface-use\", \"arguments\": { \"interfaces\": [ \"eth0\" ] } }";
diff --git a/src/lib/dhcpsrv/cfg_iface.cc b/src/lib/dhcpsrv/cfg_iface.cc
index 4bdad61615..c07ef0c4ff 100644
--- a/src/lib/dhcpsrv/cfg_iface.cc
+++ b/src/lib/dhcpsrv/cfg_iface.cc
@@ -544,72 +544,11 @@ CfgIface::use(const uint16_t family, const std::string& iface_name) {
                       << "' has already been specified");
         }
 
-        // Log that we're listening on the specific interface and that the
-        // address is not explicitly specified.
         LOG_INFO(dhcpsrv_logger, DHCPSRV_CFGMGR_ADD_IFACE).arg(name);
         iface_set_.insert(name);
     }
 }
 
-bool
-CfgIface::merge(const CfgIface& other, const uint16_t family) {
-    bool updated = false;
-    if (other.wildcard_used_) {
-        wildcard_used_ = true;
-        updated = true;
-    } else {
-        // Use a copy of the containers so that no change is applied until everything is checked.
-        auto address_map = address_map_;
-        auto iface_set = iface_set_;
-        for (auto const& addr_key : other.address_map_) {
-            // For the IPv4, if the interface name was specified (instead of the interface-
-            // address tuple) all addresses are already activated. Adding an explicit address
-            // for the interface should result in error.
-            if ((family == AF_INET) && (iface_set.find(addr_key.first) != iface_set.end())) {
-                isc_throw(DuplicateIfaceName, "interface '" << addr_key.first
-                          << "' has already been selected");
-            }
-            // Check if the address hasn't been selected already.
-            std::pair<const std::string, IOAddress> iface_address_tuple(addr_key.first, addr_key.second);
-            if (std::find(address_map.begin(), address_map.end(),
-                          iface_address_tuple) != address_map.end()) {
-                isc_throw(DuplicateAddress, "must not select address '"
-                          << addr_key.second << "' for interface '" << addr_key.first << "' "
-                          "because this address is already selected");
-            }
-            address_map.insert(addr_key);
-        }
-        for (auto const& name : other.iface_set_) {
-            if ((name != ALL_IFACES_KEYWORD)) {
-                // An interface has been selected or an IPv4 address on this interface
-                // has been selected it is not allowed to select the whole interface.
-                if ((iface_set.find(name) != iface_set.end()) ||
-                    ((family == AF_INET) && address_map.count(name) > 0)) {
-                    isc_throw(DuplicateIfaceName, "interface '" << name
-                              << "' has already been specified");
-                }
-                iface_set.insert(name);
-            }
-        }
-        // Ready to apply the changes.
-        for (auto const& addr_key : other.address_map_) {
-            address_map_.insert(addr_key);
-            updated = true;
-        }
-        for (auto const& name : other.iface_set_) {
-            if ((name != ALL_IFACES_KEYWORD)) {
-                // Log that we're listening on the specific interface and that the
-                // address is not explicitly specified.
-                LOG_INFO(dhcpsrv_logger, DHCPSRV_CFGMGR_ADD_IFACE_ON_MERGE).arg(name);
-                iface_set_.insert(name);
-                updated = true;
-            }
-        }
-    }
-
-    return (updated);
-}
-
 void
 CfgIface::useSocketType(const uint16_t family,
                         const SocketType& socket_type) {
@@ -676,5 +615,12 @@ CfgIface::toElement() const {
     return (result);
 }
 
+void
+CfgIface::update(CfgIface& other) {
+    iface_set_ = other.iface_set_;
+    address_map_ = other.address_map_;
+    wildcard_used_ = other.wildcard_used_;
+}
+
 } // end of isc::dhcp namespace
 } // end of isc namespace
diff --git a/src/lib/dhcpsrv/cfg_iface.h b/src/lib/dhcpsrv/cfg_iface.h
index c94aa1e38d..0b342c1aeb 100644
--- a/src/lib/dhcpsrv/cfg_iface.h
+++ b/src/lib/dhcpsrv/cfg_iface.h
@@ -207,13 +207,13 @@ public:
     /// @c CfgIface::use has been already called for this interface.
     void use(const uint16_t family, const std::string& iface_name);
 
-    /// @brief Merge the interface list and address list.
+    /// @brief Update runtime mutable members.
     ///
-    /// @param other The object from which the lists are updated.
-    /// @param family Address family (AF_INET or AF_INET6).
+    /// @note Currently supported members are @ref iface_set_,
+    /// @ref address_map_ and @ref wildcard_used_.
     ///
-    /// @return true if any change has been done, false otherwise.
-    bool merge(const CfgIface& other, const uint16_t family);
+    /// @param other The other object to update members from.
+    void update(CfgIface& other);
 
     /// @brief Sets the specified socket type to be used by the server.
     ///
diff --git a/src/lib/dhcpsrv/dhcpsrv_messages.cc b/src/lib/dhcpsrv/dhcpsrv_messages.cc
index d29e526c7f..30fc1bf0b1 100644
--- a/src/lib/dhcpsrv/dhcpsrv_messages.cc
+++ b/src/lib/dhcpsrv/dhcpsrv_messages.cc
@@ -8,7 +8,6 @@ namespace isc {
 namespace dhcp {
 
 extern const isc::log::MessageID DHCPSRV_CFGMGR_ADD_IFACE = "DHCPSRV_CFGMGR_ADD_IFACE";
-extern const isc::log::MessageID DHCPSRV_CFGMGR_ADD_IFACE_ON_MERGE = "DHCPSRV_CFGMGR_ADD_IFACE_ON_MERGE";
 extern const isc::log::MessageID DHCPSRV_CFGMGR_ADD_SUBNET4 = "DHCPSRV_CFGMGR_ADD_SUBNET4";
 extern const isc::log::MessageID DHCPSRV_CFGMGR_ADD_SUBNET6 = "DHCPSRV_CFGMGR_ADD_SUBNET6";
 extern const isc::log::MessageID DHCPSRV_CFGMGR_ALL_IFACES_ACTIVE = "DHCPSRV_CFGMGR_ALL_IFACES_ACTIVE";
@@ -192,7 +191,6 @@ namespace {
 
 const char* values[] = {
     "DHCPSRV_CFGMGR_ADD_IFACE", "listening on interface %1",
-    "DHCPSRV_CFGMGR_ADD_IFACE_ON_MERGE", "listening on interface %1",
     "DHCPSRV_CFGMGR_ADD_SUBNET4", "adding subnet %1",
     "DHCPSRV_CFGMGR_ADD_SUBNET6", "adding subnet %1",
     "DHCPSRV_CFGMGR_ALL_IFACES_ACTIVE", "enabling listening on all interfaces",
diff --git a/src/lib/dhcpsrv/dhcpsrv_messages.h b/src/lib/dhcpsrv/dhcpsrv_messages.h
index 05d6b102df..1e88bdaa10 100644
--- a/src/lib/dhcpsrv/dhcpsrv_messages.h
+++ b/src/lib/dhcpsrv/dhcpsrv_messages.h
@@ -9,7 +9,6 @@ namespace isc {
 namespace dhcp {
 
 extern const isc::log::MessageID DHCPSRV_CFGMGR_ADD_IFACE;
-extern const isc::log::MessageID DHCPSRV_CFGMGR_ADD_IFACE_ON_MERGE;
 extern const isc::log::MessageID DHCPSRV_CFGMGR_ADD_SUBNET4;
 extern const isc::log::MessageID DHCPSRV_CFGMGR_ADD_SUBNET6;
 extern const isc::log::MessageID DHCPSRV_CFGMGR_ALL_IFACES_ACTIVE;
diff --git a/src/lib/dhcpsrv/dhcpsrv_messages.mes b/src/lib/dhcpsrv/dhcpsrv_messages.mes
index 0c4f0be105..b653f27aa8 100644
--- a/src/lib/dhcpsrv/dhcpsrv_messages.mes
+++ b/src/lib/dhcpsrv/dhcpsrv_messages.mes
@@ -10,10 +10,6 @@ $NAMESPACE isc::dhcp
 An info message issued when a new interface is being added to the collection of
 interfaces on which the server listens to DHCP messages.
 
-% DHCPSRV_CFGMGR_ADD_IFACE_ON_MERGE listening on interface %1
-An info message issued when a new interface is being added to the collection of
-interfaces on which the server listens to DHCP messages.
-
 % DHCPSRV_CFGMGR_ADD_SUBNET4 adding subnet %1
 Logged at debug log level 40.
 A debug message reported when the DHCP configuration manager is adding the
diff --git a/src/lib/dhcpsrv/parsers/ifaces_config_parser.h b/src/lib/dhcpsrv/parsers/ifaces_config_parser.h
index 9eb25cb0fa..bb044fc545 100644
--- a/src/lib/dhcpsrv/parsers/ifaces_config_parser.h
+++ b/src/lib/dhcpsrv/parsers/ifaces_config_parser.h
@@ -44,7 +44,6 @@ public:
     /// are invalid.
     void parse(const CfgIfacePtr& config, const isc::data::ConstElementPtr& values);
 
-private:
     /// @brief parses interfaces-list structure
     ///
     /// This method goes through all the interfaces-specified in
@@ -57,6 +56,8 @@ private:
     void parseInterfacesList(const CfgIfacePtr& cfg_iface,
                              isc::data::ConstElementPtr ifaces_list);
 
+private:
+
     /// @brief AF_INET for DHCPv4 and AF_INET6 for DHCPv6.
     int protocol_;
 
diff --git a/src/lib/dhcpsrv/tests/cfg_iface_unittest.cc b/src/lib/dhcpsrv/tests/cfg_iface_unittest.cc
index 8fc0d70c7c..c935664165 100644
--- a/src/lib/dhcpsrv/tests/cfg_iface_unittest.cc
+++ b/src/lib/dhcpsrv/tests/cfg_iface_unittest.cc
@@ -10,7 +10,6 @@
 #include <dhcp/testutils/pkt_filter_test_stub.h>
 #include <dhcp/testutils/pkt_filter6_test_stub.h>
 #include <dhcpsrv/cfg_iface.h>
-#include <dhcpsrv/parsers/ifaces_config_parser.h>
 #include <asiolink/io_service.h>
 #include <asiolink/asio_wrapper.h>
 #include <asiolink/interval_timer.h>
@@ -1738,44 +1737,6 @@ TEST_F(CfgIfaceTest, retryDoubleOpenServiceSockets6) {
     EXPECT_EQ(second_port_calls, 2);
 }
 
-// Test that merge CfgIface works properly.
-TEST_F(CfgIfaceTest, mergeV4CfgIface) {
-    CfgIfacePtr left(new CfgIface());
-    CfgIfacePtr right(new CfgIface());
-    std::string left_txt("{ \"interfaces\": [\"eth0\", \"eth1/192.0.2.3\"], \"re-detect\": false }");
-    std::string right_txt("{ \"interfaces\": [\"eth0/10.0.0.1\", \"eth1961\"], \"re-detect\": false }");
-    ConstElementPtr left_cfg = Element::fromJSON(left_txt);
-    ConstElementPtr right_cfg = Element::fromJSON(right_txt);
-    IfacesConfigParser parser(AF_INET, true);
-    EXPECT_NO_THROW(parser.parse(left, left_cfg));
-    auto lift_before = left->toElement()->str();
-    EXPECT_NO_THROW(parser.parse(right, right_cfg));
-    auto right_before = right->toElement()->str();
-    EXPECT_THROW(left->merge(*right, AF_INET), DuplicateIfaceName);
-    EXPECT_EQ(lift_before, left->toElement()->str());
-    EXPECT_THROW(right->merge(*left, AF_INET), DuplicateIfaceName);
-    EXPECT_EQ(right_before, right->toElement()->str());
-}
-
-// Test that merge CfgIface works properly.
-TEST_F(CfgIfaceTest, mergeV6CfgIface) {
-    CfgIfacePtr left(new CfgIface());
-    CfgIfacePtr right(new CfgIface());
-    std::string left_txt("{ \"interfaces\": [\"eth0/2001:db8:1::1\", \"eth1\"], \"re-detect\": false }");
-    std::string right_txt("{ \"interfaces\": [\"eth0/2001:db8:1::1\", \"eth1961\"], \"re-detect\": false }");
-    ConstElementPtr left_cfg = Element::fromJSON(left_txt);
-    ConstElementPtr right_cfg = Element::fromJSON(right_txt);
-    IfacesConfigParser parser(AF_INET6, true);
-    EXPECT_NO_THROW(parser.parse(left, left_cfg));
-    auto lift_before = left->toElement()->str();
-    EXPECT_NO_THROW(parser.parse(right, right_cfg));
-    auto right_before = right->toElement()->str();
-    EXPECT_THROW(left->merge(*right, AF_INET6), DuplicateAddress);
-    EXPECT_EQ(lift_before, left->toElement()->str());
-    EXPECT_THROW(right->merge(*left, AF_INET6), DuplicateAddress);
-    EXPECT_EQ(right_before, right->toElement()->str());
-}
-
 // This test verifies that it is possible to specify the socket
 // type to be used by the DHCPv4 server.
 // This test is enabled on LINUX and BSD only, because the
diff --git a/src/share/api/interface-list.json b/src/share/api/interface-list.json
index 7f9ebfda5e..7f2abdf791 100644
--- a/src/share/api/interface-list.json
+++ b/src/share/api/interface-list.json
@@ -1,6 +1,6 @@
 {
     "access": "read",
-    "avail": "3.1.8",
+    "avail": "3.1.9",
     "brief": [
         "This command retrieves the list of detected interfaces.",
         "This command does not take any parameters."
diff --git a/src/share/api/interface-redetect.json b/src/share/api/interface-redetect.json
index 5f9e71cdfa..d08a0c744f 100644
--- a/src/share/api/interface-redetect.json
+++ b/src/share/api/interface-redetect.json
@@ -1,6 +1,6 @@
 {
     "access": "write",
-    "avail": "3.1.8",
+    "avail": "3.1.9",
     "brief": [
         "This command retrieves the list of detected interfaces after performing",
         "a re-detect procedure.",
diff --git a/src/share/api/interface-use.json b/src/share/api/interface-use.json
index 163d5a70e9..126f5932ee 100644
--- a/src/share/api/interface-use.json
+++ b/src/share/api/interface-use.json
@@ -1,6 +1,6 @@
 {
     "access": "write",
-    "avail": "3.1.8",
+    "avail": "3.1.9",
     "brief": [
         "This command updates the list of interfaces used to process DHCP traffic.",
         "This command takes as parameter the list of interfaces with respective",