SNMP v1 v2c Get request

SNMP Version 1 or 2c Get request

SNMP Get request is used to retrieve individual MIB values. To make a Get request you need to know the OID of the value you wish to retrieve.

Example retrieves 5 MIB values. In a real application you can request values for 1 or more OIDs. Keep in mind that response size has to be up to maximum packet size bytes so don't request too many variables in a single packet.

using System;
using System.Net;
using SnmpSharpNet;
 
namespace snmpget
{
    class Program
    {
        static void Main(string[] args)
        {
            // SNMP community name
            OctetString community = new OctetString("public");
 
            // Define agent parameters class
            AgentParameters param = new AgentParameters(community);
            // Set SNMP version to 1 (or 2)
            param.Version = SnmpVersion.Ver1;
            // Construct the agent address object
            // IpAddress class is easy to use here because
            //  it will try to resolve constructor parameter if it doesn't
            //  parse to an IP address
            IpAddress agent = new IpAddress("127.0.0.1");
 
            // Construct target
            UdpTarget target = new UdpTarget((IPAddress)agent, 161, 2000, 1);
 
            // Pdu class used for all requests
            Pdu pdu = new Pdu(PduType.Get);
            pdu.VbList.Add("1.3.6.1.2.1.1.1.0"); //sysDescr
            pdu.VbList.Add("1.3.6.1.2.1.1.2.0"); //sysObjectID
            pdu.VbList.Add("1.3.6.1.2.1.1.3.0"); //sysUpTime
            pdu.VbList.Add("1.3.6.1.2.1.1.4.0"); //sysContact
            pdu.VbList.Add("1.3.6.1.2.1.1.5.0"); //sysName
 
            // Make SNMP request
            SnmpV1Packet result = (SnmpV1Packet)target.Request(pdu, param);
 
            // If result is null then agent didn't reply or we couldn't parse the reply.
            if (result != null)
            {
                // ErrorStatus other then 0 is an error returned by 
                // the Agent - see SnmpConstants for error definitions
                if (result.Pdu.ErrorStatus != 0)
                {
                    // agent reported an error with the request
                    Console.WriteLine("Error in SNMP reply. Error {0} index {1}", 
                        result.Pdu.ErrorStatus,
                        result.Pdu.ErrorIndex);
                }
                else
                {
                    // Reply variables are returned in the same order as they were added
                    //  to the VbList
                    Console.WriteLine("sysDescr({0}) ({1}): {2}",
                        result.Pdu.VbList[0].Oid.ToString(), 
                        SnmpConstants.GetTypeName(result.Pdu.VbList[0].Value.Type),
                        result.Pdu.VbList[0].Value.ToString());
                    Console.WriteLine("sysObjectID({0}) ({1}): {2}",
                        result.Pdu.VbList[1].Oid.ToString(), 
                        SnmpConstants.GetTypeName(result.Pdu.VbList[1].Value.Type),
                        result.Pdu.VbList[1].Value.ToString());
                    Console.WriteLine("sysUpTime({0}) ({1}): {2}",
                        result.Pdu.VbList[2].Oid.ToString(), 
                        SnmpConstants.GetTypeName(result.Pdu.VbList[2].Value.Type),
                        result.Pdu.VbList[2].Value.ToString());
                    Console.WriteLine("sysContact({0}) ({1}): {2}",
                        result.Pdu.VbList[3].Oid.ToString(), 
                        SnmpConstants.GetTypeName(result.Pdu.VbList[3].Value.Type),
                        result.Pdu.VbList[3].Value.ToString());
                    Console.WriteLine("sysName({0}) ({1}): {2}",
                        result.Pdu.VbList[4].Oid.ToString(), 
                        SnmpConstants.GetTypeName(result.Pdu.VbList[4].Value.Type),
                        result.Pdu.VbList[4].Value.ToString());
                }
            }
            else
            {
                Console.WriteLine("No response received from SNMP agent.");
            }
            target.Close();
        }
    }
}

Result

When I run the above example on my notebook, I get following output:

sysDescr(1.3.6.1.2.1.1.1.0) (OctetString): "Dual core Intel notebook"
sysObjectID(1.3.6.1.2.1.1.2.0) (ObjectId): 1.3.6.1.9.233.1.1
sysUpTime(1.3.6.1.2.1.1.3.0) (TimeTicks): 0d 1h 50m 28s 280ms
sysContact(1.3.6.1.2.1.1.4.0) (OctetString): "[email protected]"
sysName(1.3.6.1.2.1.1.5.0) (OctetString): "milans-nbook"