/// <summary>
/// Reads the variable binds.
/// </summary>
/// <param name="bytes">The bytes.</param>
/// <param name="offset">The offset.</param>
/// <param name="bytesLength">Length of the bytes.</param>
/// <returns>
/// VarBinds
/// </returns>
/// <exception cref="System.DataMisalignedException">Bad Data/Mulformated Asn1/Snmp data</exception>
/// <exception cref="InvalidOperationException">Malformed datagram/Out of sequemce data</exception>
public static VarBind[] ReadVarBinds(this byte[] bytes, int offset, int bytesLength)
{
VarBind[] values = new VarBind[100];
int varbindCount = 0;
bytesLength += offset;
while (offset < bytesLength)
{
Asn1TagInfo cct = bytes[offset++].DecodeToClassConstructType();
int length = 0;
offset = ReadLength(bytes, offset, out length);
if (ConstructType.Primitive != cct.Asn1ConstructType)
{
continue;
}
if (cct.Asn1TagType == Asn1Tag.NotAsn1Data || cct.Asn1TagType != Asn1Tag.ObjectIdentifier)
{
throw new DataMisalignedException("Bad Data/Mulformated Asn1/Snmp data");
}
uint[] key = ReadOids(bytes, offset, length);
offset += length;
// Get [TLV] type, length, value
cct = bytes[offset++].DecodeToClassConstructType();
offset = ReadLength(bytes, offset, out length);
object value;
offset = GetVarBindValue(bytes, offset, length, cct, out value);
//Make varbind
MakeVarBinds(ref values, key, value, cct, varbindCount++);
}
if (varbindCount != values.Length)
{
Array.Resize(ref values, varbindCount);
}
return(values);
}
/// <summary>
/// Makes the variable binds.
/// </summary>
/// <param name="varBinds">Varbind value.</param>
/// <param name="key">The key.</param>
/// <param name="value">The value.</param>
/// <param name="tag">The asn1 tag.</param>
/// <param name="varbindCount">The varbind count.</param>
private static void MakeVarBinds(ref VarBind[] varBinds, uint[] key, object value, Asn1TagInfo tag, int varbindCount)
{
int length = varBinds.Length;
if (varbindCount >= length)
{
Array.Resize(ref varBinds, length + 100);
}
varBinds[varbindCount] = new VarBind(new ObjectIdentifier(key), value, tag);
}
/// <summary>
/// Gets the variable bind value.
/// </summary>
/// <param name="bytes">The bytes.</param>
/// <param name="offset">The offset.</param>
/// <param name="length">The length.</param>
/// <param name="tagInfo">The tag information.</param>
/// <param name="value">The value.</param>
/// <returns>offset int</returns>
private static int GetVarBindValue(byte[] bytes, int offset, int length, Asn1TagInfo tagInfo, out object value)
{
if (tagInfo.Asn1TagType == Asn1Tag.NotAsn1Data)
{
switch (tagInfo.Asn1SnmpTagType)
{
case Asn1SnmpTag.IpAddress:
{
value = ReadIPAddress(bytes, offset);
break;
}
case Asn1SnmpTag.Counter:
{
value = ReadUnsignedInteger(bytes, offset, length);
break;
}
case Asn1SnmpTag.Counter64:
{
value = ReadUnsignedLong(bytes, offset, length);
break;
}
case Asn1SnmpTag.Gauge:
{
value = ReadUnsignedInteger(bytes, offset, length);
break;
}
case Asn1SnmpTag.UInt32:
{
value = ReadUnsignedInteger(bytes, offset, length);
break;
}
case Asn1SnmpTag.TimeTicks:
{
value = ReadUnsignedInteger(bytes, offset, length);
break;
}
default:
{
value = "NYI: " + tagInfo.Asn1SnmpTagType.ToString();
break;
}
}
}
else
{
switch (tagInfo.Asn1TagType)
{
case Asn1Tag.Null:
{
value = null;
break;
}
case Asn1Tag.Integer:
{
value = ReadLongInteger(bytes, offset, length);
break;
}
case Asn1Tag.OctetString:
{
value = ReadOctetString(bytes, offset, length);
break;
}
case Asn1Tag.ObjectIdentifier:
{
value = new ObjectIdentifier(bytes.ReadOids(offset, length));
break;
}
default:
{
value = "NYI: " + tagInfo.Asn1TagType.ToString();
break;
}
}
}
return offset + length;
}
/// <summary>
/// Makes the variable binds.
/// </summary>
/// <param name="varBinds">Varbind value.</param>
/// <param name="key">The key.</param>
/// <param name="value">The value.</param>
/// <param name="tag">The asn1 tag.</param>
/// <param name="varbindCount">The varbind count.</param>
private static void MakeVarBinds(ref VarBind[] varBinds, uint[] key, object value, Asn1TagInfo tag, int varbindCount)
{
int length = varBinds.Length;
if (varbindCount >= length)
{
Array.Resize(ref varBinds, length + 100);
}
varBinds[varbindCount] = new VarBind(new ObjectIdentifier(key), value, tag);
}
/// <summary>
/// Gets the variable bind value.
/// </summary>
/// <param name="bytes">The bytes.</param>
/// <param name="offset">The offset.</param>
/// <param name="length">The length.</param>
/// <param name="tagInfo">The tag information.</param>
/// <param name="value">The value.</param>
/// <returns>offset int</returns>
private static int GetVarBindValue(byte[] bytes, int offset, int length, Asn1TagInfo tagInfo, out object value)
{
if (tagInfo.Asn1TagType == Asn1Tag.NotAsn1Data)
{
switch (tagInfo.Asn1SnmpTagType)
{
case Asn1SnmpTag.IpAddress:
{
value = ReadIPAddress(bytes, offset);
break;
}
case Asn1SnmpTag.Counter:
{
value = ReadUnsignedInteger(bytes, offset, length);
break;
}
case Asn1SnmpTag.Counter64:
{
value = ReadUnsignedLong(bytes, offset, length);
break;
}
case Asn1SnmpTag.Gauge:
{
value = ReadUnsignedInteger(bytes, offset, length);
break;
}
case Asn1SnmpTag.UInt32:
{
value = ReadUnsignedInteger(bytes, offset, length);
break;
}
case Asn1SnmpTag.TimeTicks:
{
value = ReadUnsignedInteger(bytes, offset, length);
break;
}
default:
{
value = "NYI: " + tagInfo.Asn1SnmpTagType.ToString();
break;
}
}
}
else
{
switch (tagInfo.Asn1TagType)
{
case Asn1Tag.Null:
{
value = null;
break;
}
case Asn1Tag.Integer:
{
value = ReadLongInteger(bytes, offset, length);
break;
}
case Asn1Tag.OctetString:
{
value = ReadOctetString(bytes, offset, length);
break;
}
case Asn1Tag.ObjectIdentifier:
{
value = new ObjectIdentifier(bytes.ReadOids(offset, length));
break;
}
default:
{
value = "NYI: " + tagInfo.Asn1TagType.ToString();
break;
}
}
}
return(offset + length);
}
