/// <summary>
/// Initializes a new instance of the <see cref="SnmpV1PDU"/> struct.
/// </summary>
/// <param name="pduType">Type of the pdu.</param>
/// <param name="enterprise">The enterprise.</param>
/// <param name="agentAddress">The agent address.</param>
/// <param name="genericV1Trap">The generic v1 trap.</param>
/// <param name="specificTrap">The specific trap.</param>
/// <param name="timeStamp">The time stamp.</param>
/// <param name="varBinds">The variable binds.</param>
public SnmpV1PDU(PduType pduType, ObjectIdentifier enterprise, IPAddress agentAddress, GenericTrap genericV1Trap, int specificTrap, uint timeStamp, VarBind[] varBinds)
{
PduType = pduType;
VarBinds = new ReadOnlyCollection <VarBind>((VarBind[])varBinds.Clone());
Enterprise = enterprise;
AgentAddress = agentAddress;
GenericV1Trap = genericV1Trap;
SpecificTrap = specificTrap;
TimeStamp = timeStamp;
}
/// <summary>
/// Converts the Asn.1 encoded byte array to SNMP Datagram.
/// </summary>
/// <param name="byteSegment">The asn.1 encoded bytes.</param>
/// <param name="timestamp">The timestamp when the packet has been received.</param>
/// <param name="sourceIpAddress">The source IP address of the packet.</param>
/// <returns>
/// SnmpPacket
/// </returns>
/// <exception cref="System.ArgumentNullException">bytes</exception>
/// <exception cref="System.IO.InvalidDataException">Snmp Version V3 not supported</exception>
public static SnmpDatagram ToSnmpDatagram(
this ArraySegment <byte> byteSegment,
DateTimeOffset timestamp,
string sourceIpAddress)
{
var bytes = byteSegment.Array;
if (bytes == null || bytes.Length == 0)
{
throw new ArgumentNullException("byteSegment");
}
int offset = byteSegment.Offset;
int length;
offset = bytes.NextValueLength(offset, -1, -1, -1, out length);
offset = bytes.NextValueLength(offset, -1, -1, (int)Asn1Tag.Integer, out length);
SnmpVersion snmpVersion = (SnmpVersion)bytes.ReadInteger(offset, length);
offset += length;
if (snmpVersion == SnmpVersion.V3)
{
throw new InvalidDataException("Snmp Version V3 not supported");
}
offset = bytes.NextValueLength(offset, -1, -1, (int)Asn1Tag.OctetString, out length);
string community = bytes.ReadOctetString(offset, length);
offset += length;
PduType pduType = (PduType)(bytes[offset++] & 0x1F);
offset = bytes.ReadLength(offset, out length);
if (snmpVersion == SnmpVersion.V1 && pduType == PduType.Trap)
{
offset = bytes.NextValueLength(offset, -1, -1, (int)Asn1Tag.ObjectIdentifier, out length);
ObjectIdentifier oid = new ObjectIdentifier(bytes.ReadOids(offset, length));
offset += length;
offset = bytes.NextValueLength(offset, -1, -1, (int)Asn1SnmpTag.IpAddress, out length);
IPAddress ipAddress = bytes.ReadIpAddress(offset);
offset += length;
offset = bytes.NextValueLength(offset, -1, -1, (int)Asn1Tag.Integer, out length);
GenericTrap genericTrap = (GenericTrap)bytes.ReadInteger(offset, length);
offset += length;
offset = bytes.NextValueLength(offset, -1, -1, (int)Asn1Tag.Integer, out length);
int specificTrap = bytes.ReadInteger(offset, length);
offset += length;
offset = bytes.NextValueLength(offset, -1, -1, (int)Asn1SnmpTag.TimeTicks, out length);
uint timeStamp = bytes.ReadUnsignedInteger(offset, length);
offset += length;
offset = bytes.NextValueLength(offset, (int)Asn1Class.Universal, (int)ConstructType.Constructed, (int)Asn1Tag.Sequence, out length);
VarBind[] varBinds = bytes.ReadVarBinds(offset, length);
return(new SnmpDatagramV1(
timestamp,
sourceIpAddress,
new SnmpHeader(snmpVersion, community),
varBinds));
}
else
{
offset = bytes.NextValueLength(offset, -1, -1, (int)Asn1Tag.Integer, out length);
int requestId = bytes.ReadInteger(offset, length);
offset += length;
offset = bytes.NextValueLength(offset, -1, -1, (int)Asn1Tag.Integer, out length);
SnmpErrorStatus errorStatus = (SnmpErrorStatus)bytes.ReadInteger(offset, length);
offset += length;
offset = bytes.NextValueLength(offset, -1, -1, (int)Asn1Tag.Integer, out length);
int errorIndex = bytes.ReadInteger(offset, length);
offset += length;
offset = bytes.NextValueLength(offset, (int)Asn1Class.Universal, (int)ConstructType.Constructed, (int)Asn1Tag.Sequence, out length);
VarBind[] varBinds = bytes.ReadVarBinds(offset, length);
return(new SnmpDatagramV2C(
timestamp,
sourceIpAddress,
new SnmpHeader(snmpVersion, community),
varBinds,
pduType,
requestId,
errorStatus,
errorIndex));
}
}
private void ParsePacket(DateTime receivedDate, IPEndPoint receivedEP, Byte[] packet)
{
int commlength, miblength;
if (packet[0] == 0xff)
{
Console.Error.WriteLine("Invalid Packet received from {0}", receivedEP.ToString());
return;
}
//Só é valido para versão 1 do SNMP
Int32 zeroPos = Encoding.UTF8.GetString(packet).IndexOf("\0");
if (zeroPos > 7)
{
Console.Error.WriteLine("Invalid Packet rceeived from {0}", receivedEP.ToString());
return;
}
using (MemoryStream stm = new MemoryStream(packet, zeroPos + 1, packet.Length - zeroPos - 1))
using (BinaryReader pData = new BinaryReader(stm))
{
datatype = (DataType)pData.ReadByte();
commlength = Convert.ToInt16(pData.ReadByte());
community = Encoding.UTF8.GetString(pData.ReadBytes(commlength));
pData.ReadByte(); //i have no idea
miblength = Convert.ToInt16(pData.ReadByte());
switch (datatype)
{
case DataType.trap: //Trap PDU Item 4.1.6. The Trap-PDU RFC 1157
//https://docs.microsoft.com/pt-br/windows/desktop/SecCertEnroll/about-object-identifier
pData.ReadByte(); //i have no idea
Int32 oIDLen = Convert.ToInt16(pData.ReadByte());
enterprise = OidByteArrayToString(pData.ReadBytes(oIDLen));
pData.ReadByte(); //i have no idea
Int32 agentAddrLen = Convert.ToInt16(pData.ReadByte());
agentAddr = new IPAddress(pData.ReadBytes(agentAddrLen));
pData.ReadByte(); //i have no idea
pData.ReadByte(); //i have no idea
genericTrap = (GenericTrap)pData.ReadByte();
pData.ReadByte(); //i have no idea
pData.ReadByte(); //i have no idea
specificTrap = Convert.ToInt32(pData.ReadByte());
//VarBindList
pData.ReadBytes(5);
while (pData.BaseStream.Position < pData.BaseStream.Length - 2)
{
pData.ReadByte(); //i have no idea
Int32 varBindLen = Convert.ToInt16(pData.ReadByte());
pData.ReadByte(); //i have no idea
oIDLen = Convert.ToInt16(pData.ReadByte());
String varBindOID = OidByteArrayToString(pData.ReadBytes(oIDLen));
pData.ReadByte(); //i have no idea
Int32 valueLen = Convert.ToInt16(pData.ReadByte());
Byte[] bValue = pData.ReadBytes(valueLen);
String value = Encoding.UTF8.GetString(bValue);
varBindList.Add(new SNMPTrapVarBind(varBindOID, value));
}
break;
default:
#if DEBUG
Console.Error.WriteLine("DataType não reconhecido: {0}", datatype);
#endif
break;
}
}
}
/// <summary>
/// Initializes a new instance of the <see cref="SnmpDatagram"/> class.
/// </summary>
/// <param name="pduType">Type of the pdu.</param>
/// <param name="snmpVersion">The SNMP version.</param>
/// <param name="community">The community.</param>
/// <param name="enterprise">The enterprise.</param>
/// <param name="agentAddress">The agent address.</param>
/// <param name="genericV1Trap">The generic v1 trap.</param>
/// <param name="specificTrap">The specific trap.</param>
/// <param name="timeStamp">The time stamp.</param>
/// <param name="varBinds">The variable binds.</param>
public SnmpDatagram(PduType pduType, SnmpVersion snmpVersion, string community, ObjectIdentifier enterprise, IPAddress agentAddress, GenericTrap genericV1Trap, int specificTrap, uint timeStamp, VarBind[] varBinds)
{
Header = new SnmpHeader(snmpVersion, community);
PduV1 = new SnmpV1PDU(pduType, enterprise, agentAddress, genericV1Trap, specificTrap, timeStamp, varBinds);
PduV2c = default(SnmpV2cPDU);
}
/// <summary>
/// Initializes a new instance of the <see cref="SnmpDatagram"/> class.
/// </summary>
/// <param name="pduType">Type of the pdu.</param>
/// <param name="snmpVersion">The SNMP version.</param>
/// <param name="community">The community.</param>
/// <param name="enterprise">The enterprise.</param>
/// <param name="agentAddress">The agent address.</param>
/// <param name="genericV1Trap">The generic v1 trap.</param>
/// <param name="specificTrap">The specific trap.</param>
/// <param name="timeStamp">The time stamp.</param>
/// <param name="varBinds">The variable binds.</param>
public SnmpDatagram(PduType pduType, SnmpVersion snmpVersion, string community, ObjectIdentifier enterprise, IPAddress agentAddress, GenericTrap genericV1Trap, int specificTrap, uint timeStamp, VarBind[] varBinds)
{
Header = new SnmpHeader(snmpVersion, community);
PduV1 = new SnmpV1PDU(pduType, enterprise, agentAddress, genericV1Trap, specificTrap, timeStamp, varBinds);
PduV2c = default(SnmpV2cPDU);
}
