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/**
* @brief SILA host power state implementation.
*
* This file is part of sila-snmp project.
*
* Copyright (c) 2022 SILA
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include "data/scalar.hpp"
#include "sila/sila_oid.hpp"
#include "tracing.hpp"
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
#include "snmptrap.hpp"
namespace sila
{
namespace host
{
namespace power
{
namespace state
{
using OID = phosphor::snmp::agent::OID;
static const OID state_oid = SILA_OID(1, 1);
static const OID notify_oid = SILA_OID(0, 1);
// Values specified in the MIB file.
constexpr int UNKNOWN = -1;
constexpr int OFF = 0;
constexpr int ON = 1;
struct State : public phosphor::snmp::data::Scalar<std::string>
{
static constexpr auto IFACE = "xyz.openbmc_project.State.Host";
static constexpr auto PATH = "/xyz/openbmc_project/state/host0";
State() :
phosphor::snmp::data::Scalar<std::string>(PATH, IFACE,
"CurrentHostState", "")
{
}
void setValue(value_t& var)
{
auto prev = getValue();
phosphor::snmp::data::Scalar<std::string>::setValue(var);
auto curr = getValue();
if (prev != curr)
{
DEBUGMSGTL(("sila:powerstate",
"Host power state changed: '%s' -> '%s'\n",
prev.c_str(), curr.c_str()));
phosphor::snmp::agent::Trap trap(notify_oid);
trap.add_field(state_oid, toSNMPValue());
trap.send();
}
}
int toSNMPValue() const
{
auto value = getValue();
if (value == "xyz.openbmc_project.State.Host.HostState.Running")
{
return ON;
}
if (value == "xyz.openbmc_project.State.Host.HostState.Off")
{
return OFF;
}
return UNKNOWN;
}
};
static State state;
/** @brief Handler for snmp requests */
static int State_snmp_handler(netsnmp_mib_handler* /*handler*/,
netsnmp_handler_registration* /*reginfo*/,
netsnmp_agent_request_info* reqinfo,
netsnmp_request_info* requests)
{
DEBUGMSGTL(("sila:handle",
"Processing request (%d) for silaHostPowerState\n",
reqinfo->mode));
switch (reqinfo->mode)
{
case MODE_GET:
for (netsnmp_request_info* request = requests; request;
request = request->next)
{
phosphor::snmp::agent::VariableList::set(request->requestvb,
state.toSNMPValue());
}
break;
}
return SNMP_ERR_NOERROR;
}
void init()
{
DEBUGMSGTL(("sila:init", "Initialize silaHostPowerState\n"));
state.update();
netsnmp_register_read_only_instance(netsnmp_create_handler_registration(
"silaHostPowerState", State_snmp_handler, state_oid.data(),
state_oid.size(), HANDLER_CAN_RONLY));
}
void destroy()
{
DEBUGMSGTL(("sila:shutdown", "destroy silaHostPowerState\n"));
unregister_mib(const_cast<oid*>(state_oid.data()), state_oid.size());
}
} // namespace state
} // namespace power
} // namespace host
} // namespace sila
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