public void Asn1BigVarBindEncodingTest()
{
var varBinds = new VarBind[] {
new VarBind(new ObjectIdentifier("1.3.6.1.2.1.1.3.0")),
new VarBind(new ObjectIdentifier("1.3.6.1.2.1.1.3.1"), 1, new Asn1TagInfo(Asn1Tag.Integer)),
new VarBind(new ObjectIdentifier("1.3.6.1.2.1.1.3.1"), 13, new Asn1TagInfo(Asn1Tag.Integer)),
new VarBind(new ObjectIdentifier("1.3.6.1.2.1.1.3.1"), 143, new Asn1TagInfo(Asn1Tag.Integer)),
new VarBind(new ObjectIdentifier("1.3.6.1.2.1.1.3.1"), 122, new Asn1TagInfo(Asn1Tag.Integer)),
new VarBind(new ObjectIdentifier("1.3.6.1.2.1.1.3.1"), 13456, new Asn1TagInfo(Asn1Tag.Integer)),
new VarBind(new ObjectIdentifier("1.3.6.1.2.1.1.3.1"), 1334, new Asn1TagInfo(Asn1Tag.Integer)),
new VarBind(new ObjectIdentifier("1.3.6.1.2.1.1.3.1"), 1444, new Asn1TagInfo(Asn1Tag.Integer)),
new VarBind(new ObjectIdentifier("1.3.6.1.2.1.1.3.1"), 13, new Asn1TagInfo(Asn1Tag.Integer)),
new VarBind(new ObjectIdentifier("1.3.6.1.2.1.1.3.1"), 10, new Asn1TagInfo(Asn1Tag.Integer)),
};
var packet = new SnmpDatagramV2C(
DateTimeOffset.MinValue,
"1.1.1.1",
new SnmpHeader(SnmpVersion.V2C, "Community"),
varBinds,
PduType.SNMPv2Trap,
509000,
SnmpErrorStatus.TooBig,
10000);
var encoded = packet.ToSnmpEncodedByteArray();
var snmpPack = encoded.ToSnmpDatagram();
Assert.IsNull(snmpPack.VarBinds[0].Value);
Assert.AreEqual(1, (long)snmpPack.VarBinds[1].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 SnmpDatagramV2C snmpPacket)
{
byte[] dataBytes = new byte[8194];
int length = dataBytes.EncodeVarBinds(0, snmpPacket.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.PduType);
int commonPduControlFieldLength =
1 //pduType
+ snmpPacket.RequestId.GetIntegerLength()
+ ((int)snmpPacket.ErrorStatus).GetIntegerLength()
+ snmpPacket.ErrorIndex.GetIntegerLength()
+ length; //length of varbind values
//Encode PDU length
offset = headerBytes.EncodeLength(offset, commonPduControlFieldLength);
//Encode RequestId
offset = headerBytes.EncodeInteger(offset, snmpPacket.RequestId);
//Encode ErrorStatus
offset = headerBytes.EncodeInteger(offset, (int)snmpPacket.ErrorStatus);
//Encode ErrorIndex
offset = headerBytes.EncodeInteger(offset, snmpPacket.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);
}
public void Asn1GaugeEncodingTest()
{
var sysUpTime = new VarBind(new ObjectIdentifier("1.3.6.1.2.1.1.3.0"),
506009u, new Asn1TagInfo(Asn1SnmpTag.Gauge));
var packet = new SnmpDatagramV2C(
DateTimeOffset.MinValue,
"1.1.1.1",
new SnmpHeader(SnmpVersion.V2C, "Community"),
new[] { sysUpTime },
PduType.SNMPv2Trap,
50000,
SnmpErrorStatus.NoError,
0);
var encoded = packet.ToSnmpEncodedByteArray();
var snmpPack = encoded.ToSnmpDatagram();
Assert.AreEqual(506009u, (uint)snmpPack.VarBinds[0].Value);
}
public void Asn1NullAndNotNullEncodingTest()
{
var oidWithNull = new VarBind(new ObjectIdentifier("1.3.6.1.2.1.1.3.0"));
var oidWithoutNull = new VarBind(new ObjectIdentifier("1.3.6.1.2.1.1.3.1"),
1, new Asn1TagInfo(Asn1Tag.Integer));
var packet = new SnmpDatagramV2C(
DateTimeOffset.MinValue,
"1.1.1.1",
new SnmpHeader(SnmpVersion.V2C, "Community"),
new[] { oidWithNull, oidWithoutNull },
PduType.SNMPv2Trap,
50000,
SnmpErrorStatus.NoError,
0);
var encoded = packet.ToSnmpEncodedByteArray();
var snmpPack = encoded.ToSnmpDatagram();
Assert.IsNull(snmpPack.VarBinds[0].Value);
Assert.AreEqual(1, (long)snmpPack.VarBinds[1].Value);
}
public void Asn1IpAdressEncodingTest()
{
var sysUpTime = new VarBind(new ObjectIdentifier("1.3.6.1.2.1.1.3.0"),
new System.Net.IPAddress(123453), new Asn1TagInfo(Asn1SnmpTag.IpAddress));
var packet = new SnmpDatagramV2C(
DateTimeOffset.MinValue,
"1.1.1.1",
new SnmpHeader(SnmpVersion.V2C, "Community"),
new[] { sysUpTime },
PduType.SNMPv2Trap,
50000,
SnmpErrorStatus.NoError,
0);
var encoded = packet.ToSnmpEncodedByteArray();
var snmpPack = encoded.ToSnmpDatagram();
Assert.AreEqual("61.226.1.0", snmpPack.VarBinds[0].Value.ToString());
}
