[#3542] do not open sockets in test mode

ChangeLog

@@ -52,8 +52,8 @@ Kea 2.7.2 (development) released on August 28, 2024
 2273.	[func]*		fdupont
 	The RBAC (role-based access control) hook library was
 	extended to support the new HTTP/HTTPS control socket
-	of Kea servers. Its name changed to "libdhcp_rbac.so".
-	"libca_rbac.so" is now a symbolic link to it.
+	of Kea servers. Note its name changed too from
+	"libca_rbac.so" to "libdhcp_rbac.so".
 	(Gitlab #3483)
 
 2272.	[perf]		fdupont

src/bin/dhcp4/json_config_parser.cc

@@ -733,6 +733,10 @@ configureDhcp4Server(Dhcpv4Srv& server, isc::data::ConstElementPtr config_set,
     LOG_DEBUG(dhcp4_logger, DBG_DHCP4_COMMAND, DHCP4_CONFIG_START)
         .arg(server.redactConfig(config_set)->str());
 
+    if (check_only) {
+        MultiThreadingMgr::instance().setTestMode(true);
+    }
+
     auto answer = processDhcp4Config(config_set);
 
     int status_code = CONTROL_RESULT_SUCCESS;

src/bin/dhcp6/json_config_parser.cc

@@ -524,6 +524,7 @@ processDhcp6Config(isc::data::ConstElementPtr config_set) {
             ControlSocketsParser parser;
             parser.parse(*srv_config, control_sockets);
         }
+
         ConstElementPtr multi_threading = mutable_cfg->get("multi-threading");
         if (multi_threading) {
             parameter_name = "multi-threading";
@@ -864,6 +865,10 @@ configureDhcp6Server(Dhcpv6Srv& server, isc::data::ConstElementPtr config_set,
     LOG_DEBUG(dhcp6_logger, DBG_DHCP6_COMMAND, DHCP6_CONFIG_START)
         .arg(server.redactConfig(config_set)->str());
 
+    if (check_only) {
+        MultiThreadingMgr::instance().setTestMode(true);
+    }
+
     auto answer = processDhcp6Config(config_set);
 
     int status_code = CONTROL_RESULT_SUCCESS;
@@ -967,7 +972,7 @@ configureDhcp6Server(Dhcpv6Srv& server, isc::data::ConstElementPtr config_set,
     // configuration. This will add created subnets and option values into
     // the server's configuration.
     // This operation should be exception safe but let's make sure.
-    if (status_code == CONTROL_RESULT_SUCCESS && (!check_only || extra_checks)) {
+    if (status_code == CONTROL_RESULT_SUCCESS && !check_only) {
         try {
 
             // Setup the command channel.

src/lib/config/cmd_http_listener.cc

@@ -40,6 +40,9 @@ CmdHttpListener::~CmdHttpListener() {
 
 void
 CmdHttpListener::start() {
+    if (MultiThreadingMgr::instance().isTestMode()) {
+        return;
+    }
     // We must be in multi-threading mode.
     if (!MultiThreadingMgr::instance().getMode()) {
         isc_throw(InvalidOperation, "CmdHttpListener cannot be started"

src/lib/tcp/mt_tcp_listener_mgr.cc

@@ -40,6 +40,9 @@ MtTcpListenerMgr::~MtTcpListenerMgr() {
 
 void
 MtTcpListenerMgr::start() {
+    if (MultiThreadingMgr::instance().isTestMode()) {
+        return;
+    }
     // We must be in multi-threading mode.
     if (!MultiThreadingMgr::instance().getMode()) {
         isc_throw(InvalidOperation, "MtTcpListenerMgr cannot be started"

src/lib/util/multi_threading_mgr.cc

@@ -14,7 +14,8 @@ namespace isc {
 namespace util {
 
 MultiThreadingMgr::MultiThreadingMgr()
-    : enabled_(false), critical_section_count_(0), thread_pool_size_(0) {
+    : enabled_(false), test_mode_(false), critical_section_count_(0),
+      thread_pool_size_(0) {
 }
 
 MultiThreadingMgr::~MultiThreadingMgr() {

src/lib/util/multi_threading_mgr.h

@@ -154,6 +154,22 @@ public:
     /// @param enabled The new mode.
     void setMode(bool enabled);
 
+    /// @brief Sets or clears the test mode for @c MultiThreadingMgr.
+    ///
+    /// @param test_mode A flag which indicates that the @c MultiThreadingMgr is
+    /// in the test mode (if true), or not (if false).
+    void setTestMode(const bool test_mode) {
+        test_mode_ = test_mode;
+    }
+
+    /// @brief Checks if the @c MultiThreadingMgr is in the test mode.
+    ///
+    /// @return true if the @c MultiThreadingMgr is in the test mode, false
+    /// otherwise.
+    bool isTestMode() const {
+        return (test_mode_);
+    }
+
     /// @brief Enter critical section.
     ///
     /// When entering @ref MultiThreadingCriticalSection, increment internal
@@ -308,6 +324,9 @@ private:
     /// otherwise.
     bool enabled_;
 
+    /// @brief Indicates if the @c MultiThreadingMgr is in the test mode.
+    bool test_mode_;
+
     /// @brief The critical section count.
     ///
     /// In case the configuration is applied within a