如何在 C# 中订阅 snmpclient（打印机）

Question

实际上我有一个示例 SNMP 陷阱接收器代码。但它就像一个 UDP 套接字已建立并侦听陷阱。我正在通过在 exe 的帮助下生成陷阱来手动测试代码。但是现在我必须订阅我需要从中接收陷阱的 snmp 客户端（打印机）。谁能帮我写一个订阅代码来从侦听器代码订阅打印机。

snmptraplistener 代码：

class Program {
    static void Main(string[] args) {
        // Construct a socket and bind it to the trap manager port 162
        Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
        IPEndPoint ipep = new IPEndPoint(IPAddress.Any, 162);
        EndPoint ep = (EndPoint)ipep;
        socket.Bind(ep);
        // Disable timeout processing. Just block until packet is received
        socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, 0);
        bool run = true;
        int inlen = -1;
        while (run) {
            byte[] indata = new byte[16 * 1024];
            // 16KB receive buffer int inlen = 0;
            IPEndPoint peer = new IPEndPoint(IPAddress.Any, 0);
            EndPoint inep = (EndPoint)peer;
            try {
                inlen = socket.ReceiveFrom(indata, ref inep);
            }
            catch( Exception ex ) {
                Console.WriteLine("Exception {0}", ex.Message);
                inlen = -1;
            }
            if (inlen > 0) {
                // Check protocol version int
                int ver = SnmpPacket.GetProtocolVersion(indata, inlen);
                if (ver == (int)SnmpVersion.Ver1) {
                    // Parse SNMP Version 1 TRAP packet
                    SnmpV1TrapPacket pkt = new SnmpV1TrapPacket();
                    pkt.decode(indata, inlen);
                    Console.WriteLine("** SNMP Version 1 TRAP received from {0}:", inep.ToString());
                    Console.WriteLine("*** Trap generic: {0}", pkt.Pdu.Generic);
                    Console.WriteLine("*** Trap specific: {0}", pkt.Pdu.Specific);
                    Console.WriteLine("*** Agent address: {0}", pkt.Pdu.AgentAddress.ToString());
                    Console.WriteLine("*** Timestamp: {0}", pkt.Pdu.TimeStamp.ToString());
                    Console.WriteLine("*** VarBind count: {0}", pkt.Pdu.VbList.Count);
                    Console.WriteLine("*** VarBind content:");
                    foreach (Vb v in pkt.Pdu.VbList) {
                        Console.WriteLine("**** {0} {1}: {2}", v.Oid.ToString(), SnmpConstants.GetTypeName(v.Value.Type), v.Value.ToString());
                    }
                    Console.WriteLine("** End of SNMP Version 1 TRAP data.");
                } else {
                    // Parse SNMP Version 2 TRAP packet
                    SnmpV2Packet pkt = new SnmpV2Packet();
                    pkt.decode(indata, inlen);
                    Console.WriteLine("** SNMP Version 2 TRAP received from {0}:", inep.ToString());
                    if ((SnmpSharpNet.PduType)pkt.Pdu.Type != PduType.V2Trap) {
                        Console.WriteLine("*** NOT an SNMPv2 trap ****");
                    } else {
                        Console.WriteLine("*** Community: {0}", pkt.Community.ToString());
                        Console.WriteLine("*** VarBind count: {0}", pkt.Pdu.VbList.Count);
                        Console.WriteLine("*** VarBind content:");
                        foreach (Vb v in pkt.Pdu.VbList) {
                            Console.WriteLine("**** {0} {1}: {2}",
                               v.Oid.ToString(), SnmpConstants.GetTypeName(v.Value.Type), v.Value.ToString());
                        }
                        Console.WriteLine("** End of SNMP Version 2 TRAP data.");
                    }
                }
            } else {
                if (inlen == 0)
                    Console.WriteLine("Zero length packet received.");
            }
        }
    }
}

}

Answer 1

一般来说，你问的不是编程问题，因为你的trap listener只能监听UDP/SNMP 162端口的数据包，无法订阅任何东西

打印机管理员有责任在该打印机上配置 SNMP 代理以向您的侦听器发送陷阱 (IP/port)。

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