Decode snmpget requests

decodeRequest.js

// This accepts a raw UDP buffer & decodes it into an object
let ber = require('asn1').Ber;

var PduType = {
  160: "GetRequest",
  161: "GetNextRequest",
  162: "GetResponse",
  163: "SetRequest",
  164: "Trap",
  165: "GetBulkRequest",
  166: "InformRequest",
  167: "TrapV2",
  168: "Report"
};

function decodeRequest(buffer) {
  let reader = new ber.Reader(buffer);
  reader.readSequence();

  let req = {};

  req.version = reader.readInt();
  req.community = reader.readString();
  req.type = reader.peek();
  req.typeName = PduType[req.type];

  reader.readSequence(req.type);

  req.id = reader.readInt();
  req.errorStatus = reader.readInt();
  req.errorIndex = reader.readInt();

  reader.readSequence();
  reader.readSequence();

  req.requestOID = reader.readOID();
  req.requestType = reader.readByte();

  reader.readByte();

  return req;
}

module.exports = decodeRequest;