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/**
* @brief netsnmp_variable_list C++ wrapper.
*
* 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.
*
*/
#pragma once
namespace phosphor
{
namespace snmp
{
namespace agent
{
/**
* @brief SNMP representation of boolean type.
*/
enum class TruthValue : int
{
True = 1,
False = 2,
};
#define SNMPBOOL(value) \
static_cast<int>(value ? TruthValue::True : TruthValue::False)
struct VariableList
{
/**
* @brief Fill snmp field with string value.
*/
static void set(netsnmp_variable_list* var, const std::string& value)
{
snmp_set_var_typed_value(var, ASN_OCTET_STR, value.c_str(),
value.length());
}
/**
* @brief Fill snmp field with boolean value.
*/
static void set(netsnmp_variable_list* var, bool value)
{
snmp_set_var_typed_integer(var, ASN_INTEGER, SNMPBOOL(value));
}
/**
* @brief Fill snmp field with integral value.
*/
template <typename T> static void set(netsnmp_variable_list* var, T&& value)
{
snmp_set_var_typed_integer(var, ASN_INTEGER, value);
}
/**
* @brief Add string as field into snmp variables list.
*
* @param vars - Pointer to snmp variables list
* @param field_oid - field OID
* @param field_oid_len - length of field OID
* @param field_value - field value
*/
static void add(netsnmp_variable_list* vars, const oid* field_oid,
size_t field_oid_len, const std::string& field_value)
{
snmp_varlist_add_variable(
&vars, field_oid, field_oid_len, ASN_OCTET_STR,
reinterpret_cast<const u_char*>(field_value.data()),
field_value.length());
}
/**
* @brief Add boolean as field into snmp variables list.
*
* @param vars - Pointer to snmp variables list
* @param field_oid - field OID
* @param field_oid_len - length of field OID
* @param field_value - field value
*/
static void add(netsnmp_variable_list* vars, const oid* field_oid,
size_t field_oid_len, bool field_value)
{
auto v = SNMPBOOL(field_value);
snmp_varlist_add_variable(&vars, field_oid, field_oid_len, ASN_INTEGER,
&v, sizeof(v));
}
/**
* @brief Add value of integral type as field into snmp variables list.
*
* @param vars - Pointer to snmp variables list
* @param field_oid - field OID
* @param field_oid_len - length of field OID
* @param field_value - field value
*/
template <typename T>
static void add(netsnmp_variable_list* vars, const oid* field_oid,
size_t field_oid_len, T&& field_value)
{
snmp_varlist_add_variable(&vars, field_oid, field_oid_len, ASN_INTEGER,
reinterpret_cast<const u_char*>(&field_value),
sizeof(field_value));
}
};
} // namespace agent
} // namespace snmp
} // namespace phosphor
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