decode() public method

Decode received SNMP packet.
Thrown when invalid encoding has been found in the packet Thrown when parsed header points to more data then is available in the packet Thrown when parsed packet is not SNMP version 1 Thrown when received PDU is of a type not supported by SNMP version 1
public decode ( byte buffer, int length ) : int
buffer byte BER encoded packet buffer
length int BER encoded packet buffer length
return int
Beispiel #1
0
        /// <summary>Make SNMP Request</summary>
        /// <remarks>
        /// Make SNMP request. With this method you can make blocked SNMP version 1, 2 and 3 requests of type GET,
        /// GET-NEXT, GET-BULK, SET and REPORT (request types have to compatible with the SNMP protocol version you
        /// are using).
        ///
        /// This method will pass through any exceptions thrown by parsing classes/methods so see individual packet
        /// classes, ASN.1 type classes, authentication, privacy, etc. classes for exceptions thrown.
        /// </remarks>
        /// <param name="pdu">Pdu class (do not pass ScopedPdu)</param>
        /// <param name="agentParameters">Security information for the request. Use <see cref="AgentParameters"/>
        /// for SNMP versions 1 and 2 requests. Use <see cref="SecureAgentParameters"/> for SNMP version 3
        /// requests.</param>
        /// <returns>Appropriate SNMP packet class for the reply received (<see cref="SnmpV1Packet"/>,
        /// <see cref="SnmpV2Packet"/>, or <see cref="SnmpV3Packet"/>. Null value if there was an error
        /// with the request.</returns>
        /// <exception cref="SnmpAuthenticationException">Thrown on SNMPv3 requests when authentication password
        /// is not specified on authNoPriv or authPriv requests in SecureAgentParameters or if incoming packet
        /// authentication check failed.
        ///
        /// With SNMP ver1 and ver2c, authentication check fails when invalid community name is parsed in the reply.</exception>
        /// <exception cref="SnmpPrivacyException">Thrown on SNMPv3 requests when privacy password is not
        /// specified in SecureAgentParameters on authPriv requests.</exception>
        /// <exception cref="SnmpException">Thrown in following cases:
        ///
        /// * IAgentParameters.Valid() returned false. SnmpException.ErrorCode is set to SnmpException.InvalidIAgentParameters
        /// * No data received on request. SnmpException.ErrorCode is set to SnmpException.NoDataReceived
        /// * Invalid RequestId in reply. SnmpException.ErrorCode is set to SnmpException.InvalidRequestId
        /// </exception>
        public SnmpPacket Request(Pdu pdu, IAgentParameters agentParameters)
        {
            byte[] outPacket;
            if (agentParameters.Version == SnmpVersion.Ver3)
            {
                SecureAgentParameters secparams = (SecureAgentParameters)agentParameters;
                if (secparams.Authentication != AuthenticationDigests.None && secparams.AuthenticationSecret.Length <= 0)
                {
                    throw new SnmpAuthenticationException("Authentication password not specified.");
                }
                if (secparams.Privacy != PrivacyProtocols.None && secparams.PrivacySecret.Length <= 0)
                {
                    throw new SnmpPrivacyException("Privacy password not specified.");
                }
                _noSourceCheck = false;                 // this option is not valid for SNMP v3 requests
                ScopedPdu    outPdu = new ScopedPdu(pdu);
                SnmpV3Packet packet = new SnmpV3Packet(outPdu);
                secparams.InitializePacket(packet);
                if (secparams.HasCachedKeys)
                {
                    outPacket = packet.encode(secparams.AuthenticationKey, secparams.PrivacyKey);
                }
                else
                {
                    outPacket = packet.encode();
                }
            }
            else if (agentParameters.Version == SnmpVersion.Ver1)
            {
                AgentParameters param = (AgentParameters)agentParameters;
                if (!param.Valid())
                {
                    throw new SnmpException(SnmpException.InvalidIAgentParameters, "Invalid AgentParameters. Unable to process request.");
                }
                SnmpV1Packet packet = new SnmpV1Packet();
                packet.Pdu.Set(pdu);
                packet.Community.Set(param.Community);
                outPacket      = packet.encode();
                _noSourceCheck = param.DisableReplySourceCheck;
            }
            else if (agentParameters.Version == SnmpVersion.Ver2)
            {
                AgentParameters param = (AgentParameters)agentParameters;
                if (!param.Valid())
                {
                    throw new SnmpException(SnmpException.InvalidIAgentParameters, "Invalid AgentParameters. Unable to process request.");
                }
                SnmpV2Packet packet = new SnmpV2Packet();
                packet.Pdu.Set(pdu);
                packet.Community.Set(param.Community);
                _noSourceCheck = param.DisableReplySourceCheck;
                outPacket      = packet.encode();
            }
            else
            {
                throw new SnmpInvalidVersionException("Unsupported SNMP version.");
            }

            byte[] inBuffer = base.Request(_address, _port, outPacket, outPacket.Length, _timeout, _retry);

            if (inBuffer == null || inBuffer.Length <= 0)
            {
                throw new SnmpException(SnmpException.NoDataReceived, "No data received on request.");
            }
            // verify packet
            if (agentParameters.Version == SnmpVersion.Ver1)
            {
                SnmpV1Packet    packet = new SnmpV1Packet();
                AgentParameters param  = (AgentParameters)agentParameters;
                packet.decode(inBuffer, inBuffer.Length);
                if (packet.Community != param.Community)
                {
                    // invalid community name received. Ignore the rest of the packet
                    throw new SnmpAuthenticationException("Invalid community name in reply.");
                }
                if (packet.Pdu.RequestId != pdu.RequestId)
                {
                    // invalid request id. unmatched response ignored
                    throw new SnmpException(SnmpException.InvalidRequestId, "Invalid request id in reply.");
                }
                return(packet);
            }
            else if (agentParameters.Version == SnmpVersion.Ver2)
            {
                SnmpV2Packet    packet = new SnmpV2Packet();
                AgentParameters param  = (AgentParameters)agentParameters;
                packet.decode(inBuffer, inBuffer.Length);
                if (packet.Community != param.Community)
                {
                    // invalid community name received. Ignore the rest of the packet
                    throw new SnmpAuthenticationException("Invalid community name in reply.");
                }
                if (packet.Pdu.RequestId != pdu.RequestId)
                {
                    // invalid request id. unmatched response ignored
                    throw new SnmpException(SnmpException.InvalidRequestId, "Invalid request id in reply.");
                }
                return(packet);
            }
            else if (agentParameters.Version == SnmpVersion.Ver3)
            {
                SnmpV3Packet          packet    = new SnmpV3Packet();
                SecureAgentParameters secparams = (SecureAgentParameters)agentParameters;
                secparams.InitializePacket(packet);
                if (secparams.HasCachedKeys)
                {
                    packet.decode(inBuffer, inBuffer.Length, secparams.AuthenticationKey, secparams.PrivacyKey);
                }
                else
                {
                    packet.decode(inBuffer, inBuffer.Length);
                }
                // first check if packet is a discovery response and process it
                if (packet.Pdu.Type == PduType.Report && packet.Pdu.VbCount > 0 && packet.Pdu.VbList[0].Oid.Equals(SnmpConstants.usmStatsUnknownEngineIDs))
                {
                    secparams.UpdateDiscoveryValues(packet);
                    return(packet);
                }
                else
                {
                    if (!secparams.ValidateIncomingPacket(packet))
                    {
                        return(null);
                    }
                    else
                    {
                        secparams.UpdateDiscoveryValues(packet);                         // update time, etc. values
                        return(packet);
                    }
                }
            }
            return(null);
        }
Beispiel #2
0
        internal void AsyncResponse(AsyncRequestResult result, IPEndPoint peer, byte[] buffer, int buflen)
        {
            if (result != AsyncRequestResult.NoError)
            {
                _response(result, null);
            }
            else
            {
                if (buffer == null || buffer.Length <= 0 || buflen <= 0)
                {
                    _response(AsyncRequestResult.NoDataReceived, null);
                    return;
                }
                // verify packet
                if (_agentParameters.Version == (int)SnmpVersion.Ver1)
                {
                    SnmpV1Packet packet = new SnmpV1Packet();
                    try
                    {
                        packet.decode(buffer, buflen);
                    }
                    catch (Exception ex)
                    {
                        ex.GetType();
                        // Console.WriteLine("Exception while decoding SNMP packet: " + ex.ToString());
                        _response(AsyncRequestResult.DecodeError, packet);
                        return;
                    }
                    _response(AsyncRequestResult.NoError, packet);
                    return;
                }
                else if (_agentParameters.Version == SnmpVersion.Ver2)
                {
                    SnmpV2Packet packet = new SnmpV2Packet();
                    try
                    {
                        packet.decode(buffer, buflen);
                    }
                    catch (Exception ex)
                    {
                        ex.GetType();
                        // Console.WriteLine("Exception while decoding SNMP packet: " + ex.ToString());
                        // MutableByte b = new MutableByte(buffer, buflen);
                        // Console.WriteLine("Buffer length {0}", buflen);
                        // SnmpConstants.DumpHex(b);
                        _response(AsyncRequestResult.DecodeError, packet);
                        return;
                    }

                    _response(AsyncRequestResult.NoError, packet);
                }
                else if (_agentParameters.Version == SnmpVersion.Ver3)
                {
                    SnmpV3Packet          packet    = new SnmpV3Packet();
                    SecureAgentParameters secparams = (SecureAgentParameters)_agentParameters;
                    secparams.InitializePacket(packet);
                    try {
                        if (secparams.HasCachedKeys)
                        {
                            packet.decode(buffer, buflen, secparams.AuthenticationKey, secparams.PrivacyKey);
                        }
                        else
                        {
                            packet.decode(buffer, buflen);
                        }
                    }
                    catch
                    {
                        _response(AsyncRequestResult.DecodeError, packet);
                        return;
                    }
                    if (!secparams.ValidateIncomingPacket(packet))
                    {
                        _response(AsyncRequestResult.AuthenticationError, packet);
                    }
                    else
                    {
                        secparams.UpdateDiscoveryValues(packet);                         // update time, etc. values
                        _response(AsyncRequestResult.NoError, packet);
                    }
                }
            }
        }
Beispiel #3
0
        public void zlapPulapke()
        {
            /*! 
		     *Kod pochodzi ze strony http://www.snmpsharpnet.com/?page_id=117
             */
            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)
                {
                    Console.WriteLine("TAK");

                    listaWierszyZeZlapanejPualpki.Clear();
                    // 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);
                        listaWierszyZeZlapanejPualpki.Add("** SNMP Version 1 TRAP otrzymane od " + inep.ToString());
                        listaWierszyZeZlapanejPualpki.Add("*** Trap generic: " + pkt.Pdu.Generic);
                        listaWierszyZeZlapanejPualpki.Add("*** Trap specific: " + pkt.Pdu.Specific);
                        listaWierszyZeZlapanejPualpki.Add("*** Agent address: " + pkt.Pdu.AgentAddress.ToString());
                        listaWierszyZeZlapanejPualpki.Add("*** Timestamp: " + pkt.Pdu.TimeStamp.ToString());
                        listaWierszyZeZlapanejPualpki.Add("*** VarBind count: " + pkt.Pdu.VbList.Count);
                        listaWierszyZeZlapanejPualpki.Add("*** VarBind content:");
                        foreach (Vb v in pkt.Pdu.VbList)
                        {
                            StringBuilder budowaStringa = new StringBuilder();
                            budowaStringa.Append("**** ");
                            budowaStringa.Append(v.Oid.ToString());
                            budowaStringa.Append(" " + SnmpConstants.GetTypeName(v.Value.Type));
                            budowaStringa.Append(": " + v.Value.ToString());
                            listaWierszyZeZlapanejPualpki.Add(budowaStringa.ToString());
                        }
                        listaWierszyZeZlapanejPualpki.Add("** Koniec SNMP Version 1 TRAP data.");
                        flagaWierszyZeZlapanejPulapki = true;
                        //return true;
                    }
                    else {
                        // Parse SNMP Version 2 TRAP packet 
                        SnmpV2Packet pkt = new SnmpV2Packet();
                        pkt.decode(indata, inlen);
                        listaWierszyZeZlapanejPualpki.Clear();
                        listaWierszyZeZlapanejPualpki.Add("** SNMP Version 2 TRAP otrzymane od " + inep.ToString());
                        if ((SnmpSharpNet.PduType)pkt.Pdu.Type != PduType.V2Trap)
                        {
                            listaWierszyZeZlapanejPualpki.Add("*** NOT an SNMPv2 trap ****");
                        }
                        else {
                            listaWierszyZeZlapanejPualpki.Add("*** Community: " + pkt.Community.ToString());
                            listaWierszyZeZlapanejPualpki.Add("*** VarBind count: " + pkt.Pdu.VbList.Count);
                            listaWierszyZeZlapanejPualpki.Add("*** VarBind content:");
                            foreach (Vb v in pkt.Pdu.VbList)
                            {
                                StringBuilder budowaStringa = new StringBuilder();
                                budowaStringa.Append("**** ");
                                budowaStringa.Append(v.Oid.ToString());
                                budowaStringa.Append(" " + SnmpConstants.GetTypeName(v.Value.Type));
                                budowaStringa.Append(": " + v.Value.ToString());
                                listaWierszyZeZlapanejPualpki.Add(budowaStringa.ToString());
                            }
                            listaWierszyZeZlapanejPualpki.Add("** Koniec SNMP Version 2 TRAP data.");
                        }
                        flagaWierszyZeZlapanejPulapki = true;
                        //return true;
                    }
                }
                else {
                    if (inlen == 0)
                    {
                        listaWierszyZeZlapanejPualpki.Clear();
                        listaWierszyZeZlapanejPualpki.Add("Przechwycono pusty pakiet");
                        flagaWierszyZeZlapanejPulapki = true;
                        //return true;
                    }
                }
            }
            //return false;
        }
Beispiel #4
0
        private void recv(IAsyncResult res)
        {
            IPEndPoint RemoteIpEndPoint = new IPEndPoint(IPAddress.Any, 0);
            byte[] received = Client.EndReceive(res, ref RemoteIpEndPoint);

            //Process codes

               // MessageBox.Show(Encoding.UTF8.GetString(received));

            SnmpV2Packet pkt = new SnmpV2Packet();
            pkt.decode(received, received.Length);

            _debug("Получен TRAP с адреса " + RemoteIpEndPoint.ToString());

            //NotifyIcon notifyObj = new NotifyIcon();

            //notifyObj.ShowBalloon(Convert.ToUInt32(ToolTipIcon.Info) ,"Сообщение", "Я свернулась:)",5000 );

            string trapData = "";

            foreach (Vb v in pkt.Pdu.VbList)
            {
                trapData = String.Concat(trapData, "**** " +
                   v.Oid.ToString() + " " +
                   SnmpConstants.GetTypeName(v.Value.Type) + " " +
                   v.Value.ToString());
            }

            Trap trp = new Trap(RemoteIpEndPoint.ToString(), pkt);

            if (checkForExcludes(trp))
            {

                //через анонимный делегат отправим данные трапа на грид, чтобы не подвисал интерфейс, т.к. шлем из другого потока
                this.Invoke((MethodInvoker)delegate
                {

                    //выведем нотификацию
                    taskbarNotifier.Show("", "Получен трап с адреса " + RemoteIpEndPoint.ToString() + Environment.NewLine +
                                            "Community:" + trp.tCommunity, 300, 3000, 300);

                    tList.addTrap(trp);
                    addTrapToGrid(trp); // runs on UI thread

                });

                tList.saveToFile();

            }
            Client.BeginReceive(new AsyncCallback(recv), null);
        }
Beispiel #5
0
        internal void AsyncResponse(AsyncRequestResult result, IPEndPoint peer, byte[] buffer, int buflen)
        {
            if (result != AsyncRequestResult.NoError)
            {
                _response(result, null);
            }
            else
            {
                if (buffer == null || buffer.Length <= 0 || buflen <= 0)
                {
                    _response(AsyncRequestResult.NoDataReceived, null);
                    return;
                }
                // verify packet
                if (_agentParameters.Version == (int)SnmpVersion.Ver1)
                {
                    SnmpV1Packet packet = new SnmpV1Packet();
                    try
                    {
                        packet.decode(buffer, buflen);
                    }
                    catch(Exception ex)
                    {
                        ex.GetType();
                        // Console.WriteLine("Exception while decoding SNMP packet: " + ex.ToString());
                        _response(AsyncRequestResult.DecodeError, packet);
                        return;
                    }
                    _response(AsyncRequestResult.NoError, packet);
                    return;
                }
                else if (_agentParameters.Version == SnmpVersion.Ver2)
                {
                    SnmpV2Packet packet = new SnmpV2Packet();
                    try
                    {
                        packet.decode(buffer, buflen);
                    }
                    catch (Exception ex)
                    {
                        ex.GetType();
                        // Console.WriteLine("Exception while decoding SNMP packet: " + ex.ToString());
                        // MutableByte b = new MutableByte(buffer, buflen);
                        // Console.WriteLine("Buffer length {0}", buflen);
                        // SnmpConstants.DumpHex(b);
                        _response(AsyncRequestResult.DecodeError, packet);
                        return;
                    }

                    _response(AsyncRequestResult.NoError, packet);
                }
                else if (_agentParameters.Version == SnmpVersion.Ver3)
                {
                    SnmpV3Packet packet = new SnmpV3Packet();
                    SecureAgentParameters secparams = (SecureAgentParameters)_agentParameters;
                    secparams.InitializePacket(packet);
                    try {
                        if (secparams.HasCachedKeys)
                            packet.decode(buffer, buflen, secparams.AuthenticationKey, secparams.PrivacyKey);
                        else
                            packet.decode(buffer, buflen);
                    }
                    catch
                    {
                        _response(AsyncRequestResult.DecodeError, packet);
                        return;
                    }
                    if (!secparams.ValidateIncomingPacket(packet))
                    {
                        _response(AsyncRequestResult.AuthenticationError, packet);
                    }
                    else
                    {
                        secparams.UpdateDiscoveryValues(packet); // update time, etc. values
                        _response(AsyncRequestResult.NoError, packet);
                    }
                }
            }
        }
Beispiel #6
0
        /// <summary>Make SNMP Request</summary>
        /// <remarks>
        /// Make SNMP request. With this method you can make blocked SNMP version 1, 2 and 3 requests of type GET,
        /// GET-NEXT, GET-BULK, SET and REPORT (request types have to compatible with the SNMP protocol version you
        /// are using).
        /// 
        /// This method will pass through any exceptions thrown by parsing classes/methods so see individual packet
        /// classes, ASN.1 type classes, authentication, privacy, etc. classes for exceptions thrown.
        /// </remarks>
        /// <param name="pdu">Pdu class (do not pass ScopedPdu)</param>
        /// <param name="agentParameters">Security information for the request. Use <see cref="AgentParameters"/>
        /// for SNMP versions 1 and 2 requests. Use <see cref="SecureAgentParameters"/> for SNMP version 3
        /// requests.</param>
        /// <returns>Appropriate SNMP packet class for the reply received (<see cref="SnmpV1Packet"/>, 
        /// <see cref="SnmpV2Packet"/>, or <see cref="SnmpV3Packet"/>. Null value if there was an error
        /// with the request.</returns>
        /// <exception cref="SnmpAuthenticationException">Thrown on SNMPv3 requests when authentication password
        /// is not specified on authNoPriv or authPriv requests in SecureAgentParameters or if incoming packet 
        /// authentication check failed.
        /// 
        /// With SNMP ver1 and ver2c, authentication check fails when invalid community name is parsed in the reply.</exception>
        /// <exception cref="SnmpPrivacyException">Thrown on SNMPv3 requests when privacy password is not
        /// specified in SecureAgentParameters on authPriv requests.</exception>
        /// <exception cref="SnmpException">Thrown in following cases:
        /// 
        /// * IAgentParameters.Valid() returned false. SnmpException.ErrorCode is set to SnmpException.InvalidIAgentParameters
        /// * No data received on request. SnmpException.ErrorCode is set to SnmpException.NoDataReceived
        /// * Invalid RequestId in reply. SnmpException.ErrorCode is set to SnmpException.InvalidRequestId
        /// </exception>
        public SnmpPacket Request(Pdu pdu, IAgentParameters agentParameters)
        {
            byte[] outPacket;
            if (agentParameters.Version == SnmpVersion.Ver3)
            {
                SecureAgentParameters secparams = (SecureAgentParameters)agentParameters;
                if (secparams.Authentication != AuthenticationDigests.None && secparams.AuthenticationSecret.Length <= 0)
                    throw new SnmpAuthenticationException("Authentication password not specified.");
                if (secparams.Privacy != PrivacyProtocols.None && secparams.PrivacySecret.Length <= 0)
                    throw new SnmpPrivacyException("Privacy password not specified.");
                _noSourceCheck = false; // this option is not valid for SNMP v3 requests
                ScopedPdu outPdu = new ScopedPdu(pdu);
                SnmpV3Packet packet = new SnmpV3Packet(outPdu);
                secparams.InitializePacket(packet);
                if (secparams.HasCachedKeys)
                    outPacket = packet.encode(secparams.AuthenticationKey, secparams.PrivacyKey);
                else
                    outPacket = packet.encode();
            }
            else if (agentParameters.Version == SnmpVersion.Ver1)
            {
                AgentParameters param = (AgentParameters)agentParameters;
                if (!param.Valid())
                    throw new SnmpException(SnmpException.InvalidIAgentParameters,"Invalid AgentParameters. Unable to process request.");
                SnmpV1Packet packet = new SnmpV1Packet();
                packet.Pdu.Set(pdu);
                packet.Community.Set(param.Community);
                outPacket = packet.encode();
                _noSourceCheck = param.DisableReplySourceCheck;
            }
            else if (agentParameters.Version == SnmpVersion.Ver2)
            {
                AgentParameters param = (AgentParameters)agentParameters;
                if (!param.Valid())
                    throw new SnmpException(SnmpException.InvalidIAgentParameters, "Invalid AgentParameters. Unable to process request.");
                SnmpV2Packet packet = new SnmpV2Packet();
                packet.Pdu.Set(pdu);
                packet.Community.Set(param.Community);
                _noSourceCheck = param.DisableReplySourceCheck;
                outPacket = packet.encode();
            }
            else
            {
                throw new SnmpInvalidVersionException("Unsupported SNMP version.");
            }

            byte[] inBuffer = base.Request(_address, _port, outPacket, outPacket.Length, _timeout, _retry);

            if (inBuffer == null || inBuffer.Length <= 0)
            {
                return null;
            }
            // verify packet
            if (agentParameters.Version == SnmpVersion.Ver1)
            {
                SnmpV1Packet packet = new SnmpV1Packet();
                AgentParameters param = (AgentParameters)agentParameters;
                packet.decode(inBuffer, inBuffer.Length);
                if (packet.Community != param.Community)
                {
                    // invalid community name received. Ignore the rest of the packet
                    throw new SnmpAuthenticationException("Invalid community name in reply.");
                }
                if (packet.Pdu.RequestId != pdu.RequestId)
                {
                    // invalid request id. unmatched response ignored
                    throw new SnmpException(SnmpException.InvalidRequestId, "Invalid request id in reply.");
                }
                return packet;
            }
            else if (agentParameters.Version == SnmpVersion.Ver2)
            {
                SnmpV2Packet packet = new SnmpV2Packet();
                AgentParameters param = (AgentParameters)agentParameters;
                packet.decode(inBuffer, inBuffer.Length);
                if (packet.Community != param.Community)
                {
                    // invalid community name received. Ignore the rest of the packet
                    throw new SnmpAuthenticationException("Invalid community name in reply.");
                }
                if (packet.Pdu.RequestId != pdu.RequestId)
                {
                    // invalid request id. unmatched response ignored
                    throw new SnmpException(SnmpException.InvalidRequestId, "Invalid request id in reply.");
                }
                return packet;
            }
            else if (agentParameters.Version == SnmpVersion.Ver3)
            {
                SnmpV3Packet packet = new SnmpV3Packet();
                SecureAgentParameters secparams = (SecureAgentParameters)agentParameters;
                secparams.InitializePacket(packet);
                if (secparams.HasCachedKeys)
                    packet.decode(inBuffer, inBuffer.Length, secparams.AuthenticationKey, secparams.PrivacyKey);
                else
                    packet.decode(inBuffer, inBuffer.Length);
                // first check if packet is a discovery response and process it
                if (packet.Pdu.Type == PduType.Report && packet.Pdu.VbCount > 0 && packet.Pdu.VbList[0].Oid.Equals(SnmpConstants.usmStatsUnknownEngineIDs))
                {
                    secparams.UpdateDiscoveryValues(packet);
                    return packet;
                }
                else
                {
                    if (!secparams.ValidateIncomingPacket(packet))
                    {
                        return null;
                    }
                    else
                    {
                        secparams.UpdateDiscoveryValues(packet); // update time, etc. values
                        return packet;
                    }
                }
            }
            return null;
        }
Beispiel #7
0
        private void button1_Click(object sender, EventArgs e)
        {
            // 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)
            {
                Application.DoEvents();
                Thread.Sleep(100);
                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());
                            textBox1.Text += "\n" + 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.");
                }
            }
        }