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// Copyright (C) 2016-2020 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) {
}
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.
LeaseMgrFactory::destroy();
LeaseMgrFactory::create(getLeaseDbAccessString());
// 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
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