1 files changed, 83 insertions, 0 deletions
diff --git a/agent/snmp_oid.hpp b/agent/snmp_oid.hpp
new file mode 100644
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--- /dev/null
+++ b/agent/snmp_oid.hpp
@@ -0,0 +1,83 @@
+/**
+ * @brief SNMP OID manipulation helper.
+ *
+ * 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
+
+#include <net-snmp/net-snmp-includes.h>
+#include <vector>
+#include <cstdarg>
+
+namespace phosphor
+{
+namespace snmp
+{
+namespace agent
+{
+
+using OID = std::vector<oid>;
+
+/**
+ * @brief Parse OID present as string
+ *
+ * @param oid_value - Container for parsed oid
+ * @param fmt - Format string for oid presence
+ * @param ... - Additional args for oid string
+ */
+inline void make_oid(OID& oid_value, const char* fmt, ...)
+{
+    va_list ap;
+    std::vector<char> oid_str;
+
+    // Calculate required size of oid_strfer
+    va_start(ap, fmt);
+    int n = vsnprintf(nullptr, 0, fmt, ap);
+    va_end(ap);
+
+    if (n > 0)
+    {
+        oid_str.resize(n + 1); // for terminating '\0'
+
+        // Create string oid
+        va_start(ap, fmt);
+        n = vsnprintf(oid_str.data(), oid_str.size(), fmt, ap);
+        va_end(ap);
+    }
+
+    if (n < 0)
+    {
+        oid_str.clear();
+    }
+
+    // Parse oid string
+    size_t oid_len = MAX_OID_LEN;
+    oid_value.resize(oid_len);
+    if (read_objid(oid_str.data(), oid_value.data(), &oid_len))
+    {
+        oid_value.resize(oid_len);
+    }
+    else
+    {
+        oid_value.clear();
+    }
+}
+
+} // namespace agent
+} // namespace snmp
+} // namespace phosphor