| public decode ( byte buffer, int length ) : int | ||
| buffer | byte | BER encoded packet buffer |
| length | int | BER encoded packet buffer length |
| Результат | int | |
public override int decode(byte[] buffer, int length)
{
MutableByte buf = new MutableByte(buffer, length);
int headerLength;
int offset = 0;
offset = base.decode(buffer, buffer.Length);
if (_protocolVersion.Value != (int)SnmpVersion.Ver1 )
throw new SnmpInvalidVersionException("Invalid protocol version");
offset = _snmpCommunity.decode(buf, offset);
int tmpOffset = offset;
byte asnType = AsnType.ParseHeader(buf, ref tmpOffset, out headerLength);
// Check packet length
if (headerLength + offset > buf.Length)
throw new OverflowException("Insufficient data in packet");
if (asnType != (byte)PduType.Get && asnType != (byte)PduType.GetNext && asnType != (byte)PduType.Set && asnType != (byte)PduType.Response)
throw new SnmpInvalidPduTypeException("Invalid SNMP operation received: " + string.Format("0x{0:x2}", asnType));
// Now process the Protocol Data Unit
offset = this.Pdu.decode(buf, offset);
return length;
}
/// <summary>
/// Thread Functions which does all the SNMP Agent job
/// </summary>
public void ListenerThread() {
mSock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
mSock.ReceiveTimeout = 2000;
IPEndPoint vEndPoint = new IPEndPoint(IPAddress.Any, 16100);
mSock.Bind(vEndPoint);
Debug.Log ("Agent: thread started");
byte[] vBuff = new byte[4096];
int vLen = 0;
while (true) {
if (this.mSock.Available > 0) {
EndPoint vSender = (EndPoint)new IPEndPoint(IPAddress.Any, 0);
vLen = mSock.ReceiveFrom(vBuff, ref vSender);
//Debug.Log ("Agent: Data received (bytes): " + vLen);
SnmpPacket vPacket = new SnmpV1Packet("" + "public");
vPacket.decode(vBuff, vLen);
//Debug.Log("Agent: PDU decoded: " + vPacket.Pdu.VbCount);
Oid vOid = null;
responsePacket = new SnmpV1Packet("" + "public");
responsePacket.Pdu.ErrorStatus = 0; // no error
if (vPacket.Pdu != null && vPacket.Pdu.VbList != null) {
foreach (Vb vVb in vPacket.Pdu.VbList) {
Debug.Log(vVb.ToString());
vOid = vVb.Oid;
if (vPacket.Pdu.Type == PduType.Set)
ProcessSetRequest(vOid,vVb);
if (vPacket.Pdu.Type == PduType.GetNext){
GetNext(vOid);
break;
}
ProcessGetRequest(vOid);
}
}
//Debug.Log(vOid.ToString());
responsePacket.Pdu.Type = PduType.Response;
responsePacket.Pdu.RequestId = vPacket.Pdu.RequestId;
byte[] vOutBuff = responsePacket.encode();
mSock.SendTo(vOutBuff, vSender);
callPrint = true;
}
Thread.Sleep(1000);
}
}