C# SNMP 编程

C#下利用SnmpSharpNet进行snmp开发

2009-04-22 17:59

    最近需要在c#下面开发snmp的应用，其实我的需求很简单，就是通过一个oid可以获得一个值。在网上搜索了 一些，发现很多文章都是 你抄袭我我抄袭你，基本上拷贝下来是不能运行的，还有的一些利用系统库，有一些用付费的库。
    在网上搜索了一下，发现有一个库相当的好用，SnmpSharpNet。官方网站为http://www.snmpsharpnet.com/。如果有需要请到官方网站上去下载开源的二进制文件，其中各个的介绍也相当的全面。在进行开发之前请先导入引用。
     在snmp的语句中有两种语句，snmpget/snmpwalk我觉得这两个是我用的最多的，snmpget就是通过oid进行查找，而snmpwalk可以返回一个组中的数据。下面两段程序演示了具体怎么使用。
snmpget:源地址：http://www.snmpsharpnet.com/getexample.html

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 = (int)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.Dispose();
        }
    }snmpwalk：源代码地址：http://www.snmpsharpnet.com/walkexample.htmlwalk有两种方法实现，具体看源出处using System;using System.Net;using SnmpSharpNet;namespace sharpwalk{    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 2 (GET-BULK only works with SNMP ver 2 and 3)            param.Version = (int)SnmpVersion.Ver2;            // 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);            // Define Oid that is the root of the MIB            //  tree you wish to retrieve            Oid rootOid = new Oid("1.3.6.1.2.1.2.2.1.2"); // ifDescr            // This Oid represents last Oid returned by            //  the SNMP agent            Oid lastOid = (Oid)rootOid.Clone();            // Pdu class used for all requests            Pdu pdu = new Pdu(PduType.GetBulk);            // In this example, set NonRepeaters value to 0            pdu.NonRepeaters = 0;            // MaxRepetitions tells the agent how many Oid/Value pairs to return            // in the response.            pdu.MaxRepetitions = 5;            // Loop through results            while (lastOid != null)            {                // When Pdu class is first constructed, RequestId is set to 0                // and during encoding id will be set to the random value                // for subsequent requests, id will be set to a value that                // needs to be incremented to have unique request ids for each                // packet                if (pdu.RequestId != 0)                {                    pdu.RequestId += 1;                }                // Clear Oids from the Pdu class.                pdu.VbList.Clear();                // Initialize request PDU with the last retrieved Oid                pdu.VbList.Add(lastOid);                // Make SNMP request                SnmpV2Packet result = (SnmpV2Packet)target.Request(pdu, param);                // You should catch exceptions in the Request if using in real application.                // 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);                        lastOid = null;                        break;                    }                    else                    {                        // Walk through returned variable bindings                        foreach (Vb v in result.Pdu.VbList)                        {                            // Check that retrieved Oid is "child" of the root OID                            if (rootOid.IsRootOf(v.Oid))                            {                                Console.WriteLine("{0} ({1}): {2}",                                    v.Oid.ToString(),                                     SnmpConstants.GetTypeName(v.Value.Type),                                     v.Value.ToString());                                lastOid = v.Oid;                            }                            else                            {                                // we have reached the end of the requested                                // MIB tree. Set lastOid to null and exit loop                                lastOid = null;                            }                        }                    }                }                else                {                    Console.WriteLine("No response received from SNMP agent.");                }            }            target.Dispose();        }    }}}