/// <summary>
/// Initializes a new instance of the <see cref="SnmpTrapV2C"/> class.
/// </summary>
/// <param name="snmpDatagram">The snmp datagram.</param>
public SnmpTrapV2C(SnmpDatagram snmpDatagram)
{
if (snmpDatagram.Header.Version != SnmpVersion.V2C || snmpDatagram.PduV2c.PduType == PduType.Trap)
{
throw new InvalidDataException("Not a Valid V2c Trap");
}
ObjectIdentifier trapOid = new ObjectIdentifier("1.3.6.1.6.3.1.1.4.1.0");
ObjectIdentifier sysUpTimeOid = new ObjectIdentifier("1.3.6.1.2.1.1.3.0");
PduV2c = snmpDatagram.PduV2c;
Header = snmpDatagram.Header;
TrapOid = default(ObjectIdentifier);
SysUpTime = 0;
VarBind varBind;
if (PduV2c.VarBinds.SearchFirstSubOidWith(sysUpTimeOid, out varBind) && varBind.Asn1TypeInfo.Asn1SnmpTagType == Asn1SnmpTag.TimeTicks)
{
SysUpTime = (uint)varBind.Value;
}
if (PduV2c.VarBinds.SearchFirstSubOidWith(trapOid, out varBind) && varBind.Asn1TypeInfo.Asn1TagType == Asn1Tag.ObjectIdentifier)
{
TrapOid = (ObjectIdentifier)varBind.Value;
}
}
/// <summary>
/// Initializes a new instance of the <see cref="SnmpTrapV2C"/> class.
/// </summary>
/// <param name="snmpDatagram">The snmp datagram.</param>
public SnmpTrapV2C(SnmpDatagram snmpDatagram)
{
if(snmpDatagram.Header.Version != SnmpVersion.V2C || snmpDatagram.PduV2c.PduType == PduType.Trap)
{
throw new InvalidDataException("Not a Valid V2c Trap");
}
ObjectIdentifier trapOid = new ObjectIdentifier("1.3.6.1.6.3.1.1.4.1.0");
ObjectIdentifier sysUpTimeOid = new ObjectIdentifier("1.3.6.1.2.1.1.3.0");
PduV2c = snmpDatagram.PduV2c;
Header = snmpDatagram.Header;
TrapOid = default(ObjectIdentifier);
SysUpTime = 0;
VarBind varBind;
if (PduV2c.VarBinds.SearchFirstSubOidWith(sysUpTimeOid, out varBind) && varBind.Asn1TypeInfo.Asn1SnmpTagType == Asn1SnmpTag.TimeTicks)
{
SysUpTime = (uint)varBind.Value;
}
if (PduV2c.VarBinds.SearchFirstSubOidWith(trapOid, out varBind) && varBind.Asn1TypeInfo.Asn1TagType == Asn1Tag.ObjectIdentifier)
{
TrapOid = (ObjectIdentifier)varBind.Value;
}
}
/// <summary>
/// Initializes a new instance of the <see cref="SnmpTrapV1"/> class.
/// </summary>
/// <param name="snmpDatagram">The snmp datagram.</param>
public SnmpTrapV1(SnmpDatagram snmpDatagram)
{
if (snmpDatagram.Header.Version != SnmpVersion.V1 && snmpDatagram.PduV1.PduType != PduType.Trap)
{
throw new InvalidDataException("Not a Valid V1 Trap");
}
PduV1 = snmpDatagram.PduV1;
Header = snmpDatagram.Header;
TrapOid = PduV1.Enterprise;
SysUpTime = PduV1.TimeStamp;
}
/// <summary>
/// Initializes a new instance of the <see cref="SnmpTrapV1"/> class.
/// </summary>
/// <param name="snmpDatagram">The snmp datagram.</param>
public SnmpTrapV1(SnmpDatagram snmpDatagram)
{
if (snmpDatagram.Header.Version != SnmpVersion.V1 && snmpDatagram.PduV1.PduType != PduType.Trap)
{
throw new InvalidDataException("Not a Valid V1 Trap");
}
PduV1 = snmpDatagram.PduV1;
Header = snmpDatagram.Header;
TrapOid = PduV1.Enterprise;
SysUpTime = PduV1.TimeStamp;
}
public static bool TryParseSnmpDatagram(this IUdpDatagram udpDatagram, out SnmpDatagram snmpDatagram)
{
try
{
var segment = udpDatagram.Data.AsByteArraySegment();
snmpDatagram = segment.ToSnmpDatagram(udpDatagram.ReceivedTime, udpDatagram.PacketHeader.SourceIpAddress.ToString());
return(true);
}
catch
{
snmpDatagram = default(SnmpDatagram);
return(false);
}
}
public static bool TryParseSnmpDatagram(this IUdpDatagram udpDatagram, out SnmpDatagram snmpDatagram)
{
try
{
var segment = udpDatagram.Data.AsByteArraySegment();
snmpDatagram = segment.ToSnmpDatagram(udpDatagram.ReceivedTime, udpDatagram.PacketHeader.SourceIpAddress.ToString());
return true;
}
catch
{
snmpDatagram = default(SnmpDatagram);
return false;
}
}
/// <summary>
/// Initializes a new instance of the <see cref="SnmpSimpleDatagram" /> class.
/// </summary>
/// <param name="snmpDatagramInput">The SNMP datagram input.</param>
public SnmpSimpleDatagram(SnmpDatagram snmpDatagramInput)
{
snmpDatagram = snmpDatagramInput;
Version = snmpDatagram.Header.Version;
Community = snmpDatagram.Header.Community;
PDUType = snmpDatagram.PduV2c.PduType;
RequestId = snmpDatagram.PduV2c.RequestId;
ErrorStatus = snmpDatagram.PduV2c.ErrorStatus;
ErrorIndex = snmpDatagram.PduV2c.ErrorIndex;
VarBinds = new List <KeyValuePair <string, object> >();
for (int i = 0; i < snmpDatagram.PduV2c.VarBinds.Count; i++)
{
var varBind = snmpDatagram.PduV2c.VarBinds[i];
VarBinds.Add(new KeyValuePair <string, object>(varBind.Oid.ToString(), varBind.Value));
}
}
/// <summary>
/// Initializes a new instance of the <see cref="SnmpSimpleDatagram" /> class.
/// </summary>
/// <param name="snmpDatagramInput">The SNMP datagram input.</param>
public SnmpSimpleDatagram(SnmpDatagram snmpDatagramInput)
{
snmpDatagram = snmpDatagramInput;
Version = snmpDatagram.Header.Version;
Community = snmpDatagram.Header.Community;
PDUType = snmpDatagram.PduV2c.PduType;
RequestId = snmpDatagram.PduV2c.RequestId;
ErrorStatus = snmpDatagram.PduV2c.ErrorStatus;
ErrorIndex = snmpDatagram.PduV2c.ErrorIndex;
VarBinds = new List<KeyValuePair<string, object>>();
for(int i=0 ; i< snmpDatagram.PduV2c.VarBinds.Count; i++)
{
var varBind = snmpDatagram.PduV2c.VarBinds[i];
VarBinds.Add(new KeyValuePair<string, object>(varBind.Oid.ToString(), varBind.Value));
}
}
/// <summary>
/// To Asn.1/Snmp Encoded byte array.
/// </summary>
/// <param name="snmpPacket">The SNMP packet.</param>
/// <returns>Asn.1 encoded byte array</returns>
/// <exception cref="System.ArgumentNullException">snmpPacket</exception>
public static byte[] ToSnmpEncodedByteArray(this SnmpDatagram snmpPacket)
{
if (snmpPacket == null)
{
throw new ArgumentNullException("snmpPacket");
}
if (snmpPacket.Header.Version == SnmpVersion.V3)
{
throw new InvalidDataException("Snmp Version V3 not supported");
}
byte[] dataBytes = new byte[8194];
int length = dataBytes.EncodeVarBinds(0, snmpPacket.PDU.VarBinds);
Array.Resize(ref dataBytes, length);
int headerLength = SnmpV2MessageHeaderLength + snmpPacket.Header.Community.Length;
byte[] headerBytes = new byte[headerLength];
int offset = 0;
//Encode version
offset = headerBytes.EncodeInteger(offset, (int)snmpPacket.Header.Version);
//Encode Community String
offset = headerBytes.EncodeOctetString(offset, snmpPacket.Header.Community);
//Encode PDU Type
offset = headerBytes.EncodeClassConstructType(offset, Asn1Class.ContextSpecific, ConstructType.Constructed, (byte)snmpPacket.PDU.PduType);
int CommonPduControlFieldLength =
1 //pduType
+ snmpPacket.PDU.RequestId.GetIntegerLength()
+ ((int)snmpPacket.PDU.ErrorStatus).GetIntegerLength()
+ snmpPacket.PDU.ErrorIndex.GetIntegerLength()
+ length; //length of varbind values
//Encode PDU length
offset = headerBytes.EncodeLength(offset, CommonPduControlFieldLength);
//Encode RequestId
offset = headerBytes.EncodeInteger(offset, snmpPacket.PDU.RequestId);
//Encode ErrorStatus
offset = headerBytes.EncodeInteger(offset, (int)snmpPacket.PDU.ErrorStatus);
//Encode ErrorIndex
offset = headerBytes.EncodeInteger(offset, snmpPacket.PDU.ErrorIndex);
//Encode VarBinds Length
offset = headerBytes.EncodeClassConstructType(offset, Asn1Class.Universal, ConstructType.Constructed, (byte)Asn1Tag.Sequence);
offset = headerBytes.EncodeLength(offset, length);
byte[] allBytes = new byte[6];
int newOffset = 0;
newOffset = allBytes.EncodeClassConstructType(newOffset, Asn1Class.Universal, ConstructType.Constructed, (byte)Asn1Tag.Sequence);
newOffset = allBytes.EncodeLength(newOffset, offset + length);
//Resize and append varbinds to header
Array.Resize(ref allBytes, newOffset + offset + length);
Array.Copy(headerBytes, 0, allBytes, newOffset, offset);
Array.Copy(dataBytes, 0, allBytes, newOffset + offset, length);
return(allBytes);
}
/// <summary>
/// Initializes a new instance of the <see cref="SnmpDatagram"/> class.
/// Copy construtor
/// </summary>
/// <param name="snmpPacket">The SNMP packet.</param>
public SnmpDatagram(SnmpDatagram snmpPacket)
{
Header = snmpPacket.Header;
PduV1 = snmpPacket.PduV1;
PduV2c = snmpPacket.PduV2c;
}
/// <summary>
/// Initializes a new instance of the <see cref="SnmpDatagram"/> class.
/// Copy construtor
/// </summary>
/// <param name="snmpPacket">The SNMP packet.</param>
public SnmpDatagram(SnmpDatagram snmpPacket)
{
Header = snmpPacket.Header;
PduV1 = snmpPacket.PduV1;
PduV2c = snmpPacket.PduV2c;
}
