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// Copyright (C) 2024 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/.
// 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.
#include <config.h>
#include <perfmon_log.h>
#include <cc/command_interpreter.h>
#include <dhcpsrv/cfgmgr.h>
#include <hooks/hooks.h>
#include <process/daemon.h>
using namespace isc::dhcp;
using namespace isc::hooks;
using namespace isc::log;
using namespace isc::process;
using namespace isc::perfmon;
extern "C" {
int dhcp4_srv_configured(CalloutHandle& /* handle */) {
// We do this here rather than in load() to ensure we check after the
// filter has been determined.
LOG_DEBUG(perfmon_logger, DBGLVL_TRACE_BASIC,
PERFMON_DHCP4_SOCKET_RECEIVED_TIME_SUPPORT)
.arg(IfaceMgr::instance().isSocketReceivedTimeSupported() ? "Yes" : "No");
return (0);
}
int dhcp6_srv_configured(CalloutHandle& /* handle */) {
// We do this here rather than in load() to ensure we check after the
// filter has been determined.
LOG_DEBUG(perfmon_logger, DBGLVL_TRACE_BASIC,
PERFMON_DHCP6_SOCKET_RECEIVED_TIME_SUPPORT)
.arg(IfaceMgr::instance().isSocketReceivedTimeSupported() ? "Yes" : "No");
return (0);
}
/// @brief This callout is called at the "pkt4_send" hook.
///
/// @param handle CalloutHandle which provides access to context.
///
/// @return 0 upon success, non-zero otherwise.
int pkt4_send(CalloutHandle& handle) {
CalloutHandle::CalloutNextStep status = handle.getStatus();
if (status == CalloutHandle::NEXT_STEP_DROP ||
status == CalloutHandle::NEXT_STEP_SKIP) {
return (0);
}
Pkt4Ptr query;
handle.getArgument("query4", query);
LOG_DEBUG(perfmon_logger, DBGLVL_TRACE_DETAIL, PERFMON_DHCP4_PKT_EVENTS)
.arg(query->getLabel())
.arg(query->dumpPktEvents());
return (0);
}
/// @brief This callout is called at the "pkt6_send" hook.
///
/// @param handle CalloutHandle which provides access to context.
///
/// @return 0 upon success, non-zero otherwise.
int pkt6_send(CalloutHandle& handle) {
CalloutHandle::CalloutNextStep status = handle.getStatus();
if (status == CalloutHandle::NEXT_STEP_DROP ||
status == CalloutHandle::NEXT_STEP_SKIP) {
return (0);
}
Pkt6Ptr query;
handle.getArgument("query6", query);
LOG_DEBUG(perfmon_logger, DBGLVL_TRACE_DETAIL, PERFMON_DHCP6_PKT_EVENTS)
.arg(query->getLabel())
.arg(query->dumpPktEvents());
return (0);
}
/// @brief This function is called when the library is loaded.
///
/// @param handle library handle
/// @return 0 when initialization is successful, 1 otherwise
int load(LibraryHandle& /* handle */) {
// 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");
}
}
/// @todo register commands
/// handle.registerCommandCallout("command-here", handler_here);
LOG_INFO(perfmon_logger, PERFMON_INIT_OK);
return (0);
}
/// @brief This function is called when the library is unloaded.
///
/// @return 0 if deregistration was successful, 1 otherwise
int unload() {
LOG_INFO(perfmon_logger, PERFMON_DEINIT_OK);
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);
}
} // end extern "C"
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