dnsdist: Fix possible low impact performance issues reported by Coverity

pdns/dnsdistdist/dnsdist-configuration-yaml.cc

@@ -710,7 +710,7 @@ static void loadBinds(const ::rust::Vec<dnsdist::rust::settings::BindConfigurati
           /* also create the UDP listener */
           state = std::make_shared<ClientState>(ComboAddress(std::string(bind.listen_address), defaultPort), false, bind.reuseport, bind.tcp.fast_open_queue_size, std::string(bind.interface), cpus, false);
 #if defined(HAVE_DNSCRYPT)
-          state->dnscryptCtx = dnsCryptContext;
+          state->dnscryptCtx = std::move(dnsCryptContext);
 #endif /* defined(HAVE_DNSCRYPT) */
 #if defined(HAVE_XSK)
           if (xskMap) {
@@ -739,7 +739,7 @@ static void loadWebServer(const dnsdist::rust::settings::WebserverConfiguration&
   catch (const PDNSException& e) {
     throw std::runtime_error(std::string("Error parsing the bind address for the webserver: ") + e.reason);
   }
-  dnsdist::configuration::updateRuntimeConfiguration([local, webConfig](dnsdist::configuration::RuntimeConfiguration& config) {
+  dnsdist::configuration::updateRuntimeConfiguration([local, &webConfig](dnsdist::configuration::RuntimeConfiguration& config) {
     config.d_webServerAddress = local;
     if (!webConfig.password.empty()) {
       auto holder = std::make_shared<CredentialsHolder>(std::string(webConfig.password), webConfig.hash_plaintext_credentials);
@@ -872,7 +872,7 @@ static void handleLoggingConfiguration(const dnsdist::rust::settings::LoggingCon
       }
     }
 
-    dnsdist::logging::LoggingConfiguration::setStructuredLogging(true, levelPrefix);
+    dnsdist::logging::LoggingConfiguration::setStructuredLogging(true, std::move(levelPrefix));
   }
 }
 
@@ -1310,7 +1310,7 @@ std::shared_ptr<DNSResponseActionWrapper> getLimitTTLResponseAction(const LimitT
     capTypes.insert(QType(type));
   }
 
-  auto action = dnsdist::actions::getLimitTTLResponseAction(config.min, config.max, capTypes);
+  auto action = dnsdist::actions::getLimitTTLResponseAction(config.min, config.max, std::move(capTypes));
   return newDNSResponseActionWrapper(std::move(action), config.name);
 }
 
@@ -1432,7 +1432,7 @@ std::shared_ptr<DNSActionWrapper> getDnstapLogAction(const DnstapLogActionConfig
   }
   dnsdist::actions::DnstapAlterFunction alterFunc;
   dnsdist::configuration::yaml::getLuaFunctionFromConfiguration(alterFunc, config.alter_function_name, config.alter_function_code, config.alter_function_file, "dnstap log action");
-  auto action = dnsdist::actions::getDnstapLogAction(std::string(config.identity), logger, alterFunc);
+  auto action = dnsdist::actions::getDnstapLogAction(std::string(config.identity), std::move(logger), std::move(alterFunc));
   return newDNSActionWrapper(std::move(action), config.name);
 #endif
 }
@@ -1448,7 +1448,7 @@ std::shared_ptr<DNSResponseActionWrapper> getDnstapLogResponseAction(const Dnsta
   }
   dnsdist::actions::DnstapAlterResponseFunction alterFunc;
   dnsdist::configuration::yaml::getLuaFunctionFromConfiguration(alterFunc, config.alter_function_name, config.alter_function_code, config.alter_function_file, "dnstap log response action");
-  auto action = dnsdist::actions::getDnstapLogResponseAction(std::string(config.identity), logger, alterFunc);
+  auto action = dnsdist::actions::getDnstapLogResponseAction(std::string(config.identity), std::move(logger), std::move(alterFunc));
   return newDNSResponseActionWrapper(std::move(action), config.name);
 #endif
 }

pdns/dnsdistdist/dnsdist-lua-actions.cc

@@ -229,7 +229,7 @@ void setupLuaActions(LuaContext& luaCtx)
         capTypes.insert(QType(type));
       }
     }
-    return dnsdist::actions::getLimitTTLResponseAction(min, max, capTypes);
+    return dnsdist::actions::getLimitTTLResponseAction(min, max, std::move(capTypes));
   });
 
   luaCtx.writeFunction("SetMinTTLResponseAction", [](uint32_t min) {

pdns/dnsdistdist/dnsdist-lua.cc

@@ -2104,7 +2104,7 @@ static void setupLuaConfig(LuaContext& luaCtx, bool client, bool configCheck)
     }
     setLuaSideEffect();
     if (facility.type() == typeid(std::string)) {
-      auto facilityStr = boost::get<std::string>(facility);
+      const auto& facilityStr = boost::get<std::string>(facility);
       auto facilityLevel = logFacilityFromString(facilityStr);
       if (!facilityLevel) {
         g_outputBuffer = "Unknown facility '" + facilityStr + "' passed to setSyslogFacility()!\n";