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174 | // Copyright (C) 2016-2024 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Kea Hooks Basic
// Commercial End User License Agreement v2.0. See COPYING file in the premium/
// directory.
/// @file load_unload.cc Defines the load and unload hooks library functions.
#include <config.h>
#include <asiolink/io_service.h>
#include <asiolink/io_service_mgr.h>
#include <cc/data.h>
#include <hooks/hooks.h>
#include <database/database_connection.h>
#include <dhcpsrv/cfgmgr.h>
#include <process/daemon.h>
#include <legal_log_log.h><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <backend_store.h><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <boost/lexical_cast.hpp><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <sstream><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <string><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
using namespace isc;
using namespace isc::asiolink;
using namespace isc::data;
using namespace isc::db;
using namespace isc::dhcp;
using namespace isc::hooks;
using namespace isc::process;
using namespace isc::legal_log;
using namespace std;
// Functions accessed by the hooks framework use C linkage to avoid the name
// mangling that accompanies use of the C++ compiler as well as to avoid
// issues related to namespaces.
extern "C" {
/// @brief Called by the Hooks library manager when the library is loaded.
///
/// Instantiates the BackendStore and then opens it. If there is no type
/// or type is logfile, use a RotatingFile else use a Database.
///
/// @return 0 upon success, non-zero if the legal file cannot be opened
int load(LibraryHandle& handle) {
try {
// Make the hook library not loadable by d2 or ca.
uint16_t family = CfgMgr::instance().getFamily();
const std::string& proc_name = Daemon::getProcName();
if (family == AF_INET) {
if (proc_name != "kea-dhcp4") {
isc_throw(isc::Unexpected, "Bad process name: " << proc_name
<< ", expected kea-dhcp4");
}
} else {
if (proc_name != "kea-dhcp6") {
isc_throw(isc::Unexpected, "Bad process name: " << proc_name
<< ", expected kea-dhcp6");
}
}
// Get and decode parameters.
ConstElementPtr const& parameters(handle.getParameters());
if (!parameters || !parameters->get("type") ||
parameters->get("type")->stringValue() == "logfile") {
BackendStore::parseFile(parameters);
} else {
BackendStore::parseDatabase(parameters);
}
try {
BackendStore::parseExtraParameters(parameters);
BackendStore::setConfig(parameters);
BackendStore::instance()->open();
} catch (const isc::db::DbOpenErrorWithRetry& err) {
std::string redacted;
try {
redacted = DatabaseConnection::redactedAccessString(BackendStore::getParameters());
} catch (...) {
}
LOG_INFO(legal_log_logger, LEGAL_LOG_DB_OPEN_CONNECTION_WITH_RETRY_FAILED)
.arg(redacted).arg(err.what());
}
} catch (const std::exception& ex) {
// Log the error and return failure.
LOG_ERROR(legal_log_logger, LEGAL_LOG_LOAD_ERROR)
.arg(ex.what());
return (1);
}
return (0);
}
/// @brief Called by the Hooks library manager when the library is unloaded.
///
/// Explicitly destroys the BackendStore instance. Any errors are logged but
/// swallowed.
///
/// @return Always 0.
int unload() {
try {
// Since it's "global" Let's explicitly destroy it now rather
// than indeterminately. Note, BackendStore destructor will close
// the store.
BackendStore::instance().reset();
IOServiceMgr::instance().unregisterIOService(BackendStore::getIOService());
if (BackendStore::getIOService()) {
BackendStore::getIOService()->stopAndPoll();
BackendStore::setIOService(IOServicePtr());
}
} catch (const std::exception& ex) {
// On the off chance something goes awry, catch it and log it.
// @todo Not sure if we should return a non-zero result or not.
LOG_ERROR(legal_log_logger, LEGAL_LOG_UNLOAD_ERROR)
.arg(ex.what());
}
return (0);
}
/// @brief dhcp4_srv_configured callout implementation.
///
/// @param handle callout handle.
int dhcp4_srv_configured(CalloutHandle& handle) {
try {
BackendStore::setIOService(IOServicePtr(new IOService()));
IOServiceMgr::instance().registerIOService(BackendStore::getIOService());
} catch (const std::exception& ex) {
LOG_ERROR(legal_log_logger, LEGAL_LOG_LOAD_ERROR)
.arg(ex.what());
handle.setStatus(isc::hooks::CalloutHandle::NEXT_STEP_DROP);
ostringstream os;
os << "Error: " << ex.what();
string error(os.str());
handle.setArgument("error", error);
return (1);
}
return (0);
}
/// @brief dhcp6_srv_configured callout implementation.
///
/// @param handle callout handle.
int dhcp6_srv_configured(CalloutHandle& handle) {
try {
BackendStore::setIOService(IOServicePtr(new IOService()));
IOServiceMgr::instance().registerIOService(BackendStore::getIOService());
} catch (const std::exception& ex) {
LOG_ERROR(legal_log_logger, LEGAL_LOG_LOAD_ERROR)
.arg(ex.what());
handle.setStatus(isc::hooks::CalloutHandle::NEXT_STEP_DROP);
ostringstream os;
os << "Error: " << ex.what();
string error(os.str());
handle.setArgument("error", error);
return (1);
}
return (0);
}
/// @brief This function is called to retrieve the multi-threading compatibility.
///
/// @return 1 which means compatible with multi-threading.
int multi_threading_compatible() {
return (1);
}
}
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