/// <inheritdoc />
public override bool IsApplicableSnmp(ISnmpLowerLayer snmpLowerLayer, IQuerierOptions options)
{
var description = snmpLowerLayer?.SystemData?.Description;
if (string.IsNullOrWhiteSpace(description))
{
var info = $"Description in system data of device '{snmpLowerLayer.Address}' is null, empty or white-space-only: Assuming the device is not a Ubiquiti device";
log.Warn(info);
this.CollectException("UbntSnmp: No device description", new HamnetSnmpException(info));
return(false);
}
if (!description.Contains(PossiblyUbiquitiDetectionDescriptionString))
{
var info = $"Description in system data of device '{snmpLowerLayer.Address}' doesn't contain string '{PossiblyUbiquitiDetectionDescriptionString}': Assuming the device is not a Ubiquiti device";
log.Info(info);
this.CollectException("UbntSnmp: No UBNT-like string in device description", new HamnetSnmpException(info));
return(false);
}
var ubntManufacturer = snmpLowerLayer?.DoWalk(UbntManufacturerDetectionOid);
if ((ubntManufacturer == null) || (ubntManufacturer.Count == 0))
{
var info = $"UBNT Manufacturer ID string of device '{snmpLowerLayer.Address}' is null or empty: The device could still be AirFiber";
log.Warn(info);
this.CollectException("UbntSnmp: No UBNT manufacturer detection OID", new HamnetSnmpException(info));
return(this.DetectAirFiber(snmpLowerLayer));
}
var manufacturer = ubntManufacturer.FirstOrDefault(m => m.Value.ToString().Contains(UbiquitiManufactorerDetectionString));
if (manufacturer == null)
{
var info = $"UBNT Manufacturer ID string of device '{snmpLowerLayer.Address}' doesn't contain string '{UbiquitiManufactorerDetectionString}': Assuming the device is not a Ubiquiti device";
log.Info(info);
this.CollectException("UbntSnmp: No UBNT manufacturer", new HamnetSnmpException(info));
return(false);
}
this.detectionId = manufacturer.Oid[manufacturer.Oid.Length - 1];
log.Info($"Device '{snmpLowerLayer.Address}' seems to be a Ubiquiti device (detection ID {this.detectionId})");
return(true);
}
/// <summary>
/// Detects an AirFiber device which does not really provide any manufacturer ID or similar
/// </summary>
/// <param name="snmpLowerLayer">The lower communication layer to user.</param>
/// <returns><c>true</c> if an AirFiber device has been detected and the class fields have been set accordingly.</returns>
private bool DetectAirFiber(ISnmpLowerLayer snmpLowerLayer)
{
var mibInfo41112 = snmpLowerLayer.DoWalk(AirFiberDetectionWalkRootOid);
if (mibInfo41112.Count == 0)
{
// it's also not an AirFiber device
log.Info($"Reading of OS version of device '{snmpLowerLayer.Address}' via AirFiber OID {AirFiberDetectionWalkRootOid} didn't reveal anything: Assuming the device is not an Ubiquiti AirFiber device");
return(false);
}
// never seen AirFiber returning more than one
var firstValue = mibInfo41112.First();
this.osDetectedVersion = firstValue.Value.ToString();
this.detectionId = firstValue.Oid.Last();
this.detectedModel = AirFiberFakeModelString;
return(true);
}