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-rw-r--r--src/lib/dhcpsrv/cfg_db_access.cc108
1 files changed, 108 insertions, 0 deletions
diff --git a/src/lib/dhcpsrv/cfg_db_access.cc b/src/lib/dhcpsrv/cfg_db_access.cc
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+++ b/src/lib/dhcpsrv/cfg_db_access.cc
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+// Copyright (C) 2016-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <dhcpsrv/cfg_db_access.h>
+#include <dhcpsrv/db_type.h>
+#include <dhcpsrv/host_data_source_factory.h>
+#include <dhcpsrv/host_mgr.h>
+#include <dhcpsrv/lease_mgr_factory.h>
+#include <boost/algorithm/string.hpp>
+#include <boost/foreach.hpp>
+#include <boost/lexical_cast.hpp>
+#include <sstream>
+#include <vector>
+
+using namespace isc::data;
+
+namespace isc {
+namespace dhcp {
+
+CfgDbAccess::CfgDbAccess()
+ : appended_parameters_(), lease_db_access_("type=memfile"),
+ host_db_access_(), ip_reservations_unique_(true),
+ extended_info_tables_enabled_(false) {
+}
+
+std::string
+CfgDbAccess::getLeaseDbAccessString() const {
+ return (getAccessString(lease_db_access_));
+}
+
+
+std::string
+CfgDbAccess::getHostDbAccessString() const {
+ if (host_db_access_.empty()) {
+ return ("");
+ } else {
+ return (getAccessString(host_db_access_.front()));
+ }
+}
+
+std::list<std::string>
+CfgDbAccess::getHostDbAccessStringList() const {
+ std::list<std::string> ret;
+ for (const std::string& dbaccess : host_db_access_) {
+ if (!dbaccess.empty()) {
+ ret.push_back(getAccessString(dbaccess));
+ }
+ }
+ return (ret);
+}
+
+void
+CfgDbAccess::createManagers() const {
+ // Recreate lease manager without preserving the registered callbacks.
+ LeaseMgrFactory::recreate(getLeaseDbAccessString(), false);
+
+ // Recreate host data source.
+ HostMgr::create();
+
+ // Restore the host cache.
+ if (HostDataSourceFactory::registeredFactory("cache")) {
+ HostMgr::addBackend("type=cache");
+ }
+
+ // Add database backends.
+ std::list<std::string> host_db_access_list = getHostDbAccessStringList();
+ for (std::string& hds : host_db_access_list) {
+ HostMgr::addBackend(hds);
+ }
+
+ // Check for a host cache.
+ HostMgr::checkCacheBackend(true);
+
+ // Populate the ip-reservations-unique global setting to HostMgr.
+ // This operation may fail if any of the host backends does not support
+ // the new setting. We throw an exception here to signal configuration
+ // error. The exception does not contain the backend name but the called
+ // function in HostMgr logs a warning message that contains the name of
+ // the backend.
+ if (!HostMgr::instance().setIPReservationsUnique(ip_reservations_unique_)) {
+ isc_throw(InvalidOperation, "unable to configure the server to allow "
+ "non unique IP reservations (ip-reservations-unique=false) "
+ "because some host backends in use do not support this "
+ "setting");
+ }
+}
+
+std::string
+CfgDbAccess::getAccessString(const std::string& access_string) const {
+ std::ostringstream s;
+ s << access_string;
+ // Only append additional parameters if any parameters are specified
+ // in a configuration. For host database, no parameters mean that
+ // database access is disabled and thus we don't want to append any
+ // parameters.
+ if ((s.tellp() != std::streampos(0)) && (!appended_parameters_.empty())) {
+ s << " " << appended_parameters_;
+ }
+
+ return (s.str());
+}
+
+} // end of isc::dhcp namespace
+} // end of isc namespace