public async Task <List <IoTHubDeviceInfo> > GetDeviceList(DevEui?devEUI, string gatewayId, DevNonce?devNonce, DevAddr?devAddr, ILogger log = null)
{
var results = new List <IoTHubDeviceInfo>();
if (devEUI is { } someDevEui)
{
var joinInfo = await TryGetJoinInfoAndValidateAsync(someDevEui, gatewayId, log);
// OTAA join
using var deviceCache = new LoRaDeviceCache(this.cacheStore, someDevEui, gatewayId);
var cacheKeyDevNonce = string.Concat(devEUI, ":", devNonce);
if (this.cacheStore.StringSet(cacheKeyDevNonce, devNonce?.ToString(), TimeSpan.FromMinutes(5), onlyIfNotExists: true))
{
var iotHubDeviceInfo = new IoTHubDeviceInfo
{
DevEUI = someDevEui,
PrimaryKey = joinInfo.PrimaryKey
};
results.Add(iotHubDeviceInfo);
if (await deviceCache.TryToLockAsync())
{
deviceCache.ClearCache(); // clear the fcnt up/down after the join
log?.LogDebug("Removed key '{key}':{gwid}", someDevEui, gatewayId);
}
else
{
log?.LogWarning("Failed to acquire lock for '{key}'", someDevEui);
}
}
else
{
log?.LogDebug("dev nonce already used. Ignore request '{key}':{gwid}", someDevEui, gatewayId);
throw new DeviceNonceUsedException();
}
}
// Runner
public static async Task <IActionResult> Run(HttpRequest req, ILogger log, ExecutionContext context, ApiVersion currentApiVersion)
{
// set the current version in the response header
req.HttpContext.Response.Headers.Add(ApiVersion.HttpHeaderName, currentApiVersion.Version);
var requestedVersion = req.GetRequestedVersion();
if (requestedVersion == null || !currentApiVersion.SupportsVersion(requestedVersion))
{
return(new BadRequestObjectResult($"Incompatible versions (requested: '{requestedVersion.Name ?? string.Empty}', current: '{currentApiVersion.Name}')"));
}
//ABP Case
string devAddr = req.Query["DevAddr"];
//OTAA Case
string devEUI = req.Query["DevEUI"];
string devNonce = req.Query["DevNonce"];
string gatewayId = req.Query["GatewayId"];
if (redisCache == null || registryManager == null)
{
lock (typeof(FCntCacheCheck))
{
if (redisCache == null || registryManager == null)
{
var config = new ConfigurationBuilder()
.SetBasePath(context.FunctionAppDirectory)
.AddJsonFile("local.settings.json", optional: true, reloadOnChange: true)
.AddEnvironmentVariables()
.Build();
string connectionString = config.GetConnectionString("IoTHubConnectionString");
if (connectionString == null)
{
string errorMsg = "Missing IoTHubConnectionString in settings";
throw new Exception(errorMsg);
}
string redisConnectionString = config.GetConnectionString("RedisConnectionString");
if (redisConnectionString == null)
{
string errorMsg = "Missing RedisConnectionString in settings";
throw new Exception(errorMsg);
}
registryManager = RegistryManager.CreateFromConnectionString(connectionString);
var redis = ConnectionMultiplexer.Connect(redisConnectionString);
redisCache = redis.GetDatabase();
}
}
}
List <IoTHubDeviceInfo> results = new List <IoTHubDeviceInfo>();
//OTAA join
if (devEUI != null)
{
string cacheKey = devEUI + devNonce;
try
{
if (redisCache.LockTake(cacheKey + "joinlock", gatewayId, new TimeSpan(0, 0, 10)))
{
//check if we already got the same devEUI and devNonce it can be a reaply attack or a multigateway setup recieving the same join.We are rfusing all other than the first one.
string cachedDevNonce = redisCache.StringGet(cacheKey, CommandFlags.DemandMaster);
if (!String.IsNullOrEmpty(cachedDevNonce))
{
return((ActionResult) new BadRequestObjectResult("UsedDevNonce"));
}
redisCache.StringSet(cacheKey, devNonce, new TimeSpan(0, 1, 0), When.Always, CommandFlags.DemandMaster);
IoTHubDeviceInfo iotHubDeviceInfo = new IoTHubDeviceInfo();
var device = await registryManager.GetDeviceAsync(devEUI);
if (device != null)
{
iotHubDeviceInfo.DevEUI = devEUI;
iotHubDeviceInfo.PrimaryKey = device.Authentication.SymmetricKey.PrimaryKey;
results.Add(iotHubDeviceInfo);
//clear device FCnt cache after join
redisCache.KeyDelete(devEUI);
}
}
}
finally
{
redisCache.LockRelease(cacheKey + "joinlock", gatewayId);
}
}
//ABP or normal message
else if (devAddr != null)
{
//TODO check for sql injection
devAddr = devAddr.Replace('\'', ' ');
var query = registryManager.CreateQuery($"SELECT * FROM devices WHERE properties.desired.DevAddr = '{devAddr}' OR properties.reported.DevAddr ='{devAddr}'", 100);
while (query.HasMoreResults)
{
var page = await query.GetNextAsTwinAsync();
foreach (var twin in page)
{
if (twin.DeviceId != null)
{
IoTHubDeviceInfo iotHubDeviceInfo = new IoTHubDeviceInfo();
iotHubDeviceInfo.DevAddr = devAddr;
var device = await registryManager.GetDeviceAsync(twin.DeviceId);
iotHubDeviceInfo.DevEUI = twin.DeviceId;
iotHubDeviceInfo.PrimaryKey = device.Authentication.SymmetricKey.PrimaryKey;
results.Add(iotHubDeviceInfo);
}
}
}
}
else
{
string errorMsg = "Missing devEUI or devAddr";
throw new Exception(errorMsg);
}
string json = JsonConvert.SerializeObject(results);
return((ActionResult) new OkObjectResult(json));
}
public async Task <List <IoTHubDeviceInfo> > GetDeviceList(string devEUI, string gatewayId, string devNonce, string devAddr)
{
var results = new List <IoTHubDeviceInfo>();
if (devEUI != null)
{
// OTAA join
string cacheKey = devEUI + devNonce;
using (var deviceCache = new LoRaDeviceCache(this.cacheStore, devEUI, gatewayId, cacheKey))
{
if (deviceCache.HasValue())
{
throw new DeviceNonceUsedException();
}
if (deviceCache.TryToLock(cacheKey + "joinlock"))
{
if (deviceCache.HasValue())
{
throw new DeviceNonceUsedException();
}
deviceCache.SetValue(devNonce, TimeSpan.FromMinutes(1));
var device = await this.registryManager.GetDeviceAsync(devEUI);
if (device != null)
{
var iotHubDeviceInfo = new IoTHubDeviceInfo
{
DevEUI = devEUI,
PrimaryKey = device.Authentication.SymmetricKey.PrimaryKey
};
results.Add(iotHubDeviceInfo);
this.cacheStore.KeyDelete(devEUI);
}
}
else
{
throw new DeviceNonceUsedException();
}
}
}
else if (devAddr != null)
{
// ABP or normal message
// TODO check for sql injection
devAddr = devAddr.Replace('\'', ' ');
var query = this.registryManager.CreateQuery($"SELECT * FROM devices WHERE properties.desired.DevAddr = '{devAddr}' OR properties.reported.DevAddr ='{devAddr}'", 100);
while (query.HasMoreResults)
{
var page = await query.GetNextAsTwinAsync();
foreach (var twin in page)
{
if (twin.DeviceId != null)
{
var device = await this.registryManager.GetDeviceAsync(twin.DeviceId);
var iotHubDeviceInfo = new IoTHubDeviceInfo
{
DevAddr = devAddr,
DevEUI = twin.DeviceId,
PrimaryKey = device.Authentication.SymmetricKey.PrimaryKey
};
results.Add(iotHubDeviceInfo);
}
}
}
}
else
{
throw new Exception("Missing devEUI or devAddr");
}
return(results);
}
public async Task <List <IoTHubDeviceInfo> > GetDeviceList(string devEUI, string gatewayId, string devNonce, string devAddr, ILogger log = null)
{
var results = new List <IoTHubDeviceInfo>();
if (devEUI != null)
{
var joinInfo = await this.TryGetJoinInfoAndValidateAsync(devEUI, gatewayId, log);
// OTAA join
using (var deviceCache = new LoRaDeviceCache(this.cacheStore, devEUI, gatewayId))
{
var cacheKeyDevNonce = string.Concat(devEUI, ":", devNonce);
var lockKeyDevNonce = string.Concat(cacheKeyDevNonce, ":joinlockdevnonce");
if (this.cacheStore.StringSet(cacheKeyDevNonce, devNonce, TimeSpan.FromMinutes(5), onlyIfNotExists: true))
{
var iotHubDeviceInfo = new IoTHubDeviceInfo
{
DevEUI = devEUI,
PrimaryKey = joinInfo.PrimaryKey
};
results.Add(iotHubDeviceInfo);
if (await deviceCache.TryToLockAsync())
{
this.cacheStore.KeyDelete(devEUI);
log?.LogDebug("Removed key '{key}':{gwid}", devEUI, gatewayId);
}
else
{
log?.LogWarning("Failed to acquire lock for '{key}'", devEUI);
}
}
else
{
log?.LogDebug("dev nonce already used. Ignore request '{key}':{gwid}", devEUI, gatewayId);
throw new DeviceNonceUsedException();
}
}
}
else if (devAddr != null)
{
// ABP or normal message
// TODO check for sql injection
devAddr = devAddr.Replace('\'', ' ');
var devAddrCache = new LoRaDevAddrCache(this.cacheStore, this.registryManager, log, gatewayId);
if (await devAddrCache.TryTakeDevAddrUpdateLock(devAddr))
{
try
{
if (devAddrCache.TryGetInfo(devAddr, out List <DevAddrCacheInfo> devAddressesInfo))
{
for (int i = 0; i < devAddressesInfo.Count; i++)
{
if (!string.IsNullOrEmpty(devAddressesInfo[i].DevEUI))
{
// device was not yet populated
if (!string.IsNullOrEmpty(devAddressesInfo[i].PrimaryKey))
{
results.Add(devAddressesInfo[i]);
}
else
{
// we need to load the primaryKey from IoTHub
// Add a lock loadPrimaryKey get lock get
devAddressesInfo[i].PrimaryKey = await this.LoadPrimaryKeyAsync(devAddressesInfo[i].DevEUI);
results.Add(devAddressesInfo[i]);
devAddrCache.StoreInfo(devAddressesInfo[i]);
}
// even if we fail to acquire the lock we wont enter in the next condition as devaddressinfo is not null
}
}
}
// if the cache results are null, we query the IoT Hub.
// if the device is not found is the cache we query, if there was something, it is probably not our device.
if (results.Count == 0 && devAddressesInfo == null)
{
if (await devAddrCache.TryTakeDevAddrUpdateLock(devAddr))
{
try
{
var query = this.registryManager.CreateQuery($"SELECT * FROM devices WHERE properties.desired.DevAddr = '{devAddr}' OR properties.reported.DevAddr ='{devAddr}'", 100);
int resultCount = 0;
while (query.HasMoreResults)
{
var page = await query.GetNextAsTwinAsync();
foreach (var twin in page)
{
if (twin.DeviceId != null)
{
var device = await this.registryManager.GetDeviceAsync(twin.DeviceId);
var iotHubDeviceInfo = new DevAddrCacheInfo
{
DevAddr = devAddr,
DevEUI = twin.DeviceId,
PrimaryKey = device.Authentication.SymmetricKey.PrimaryKey,
GatewayId = twin.GetGatewayID(),
NwkSKey = twin.GetNwkSKey(),
LastUpdatedTwins = twin.Properties.Desired.GetLastUpdated()
};
results.Add(iotHubDeviceInfo);
devAddrCache.StoreInfo((DevAddrCacheInfo)iotHubDeviceInfo);
}
resultCount++;
}
}
// todo save when not our devaddr
if (resultCount == 0)
{
devAddrCache.StoreInfo(new DevAddrCacheInfo()
{
DevAddr = devAddr,
DevEUI = string.Empty
});
}
}
finally
{
devAddrCache.ReleaseDevAddrUpdateLock(devAddr);
}
}
}
}
finally
{
devAddrCache.ReleaseDevAddrUpdateLock(devAddr);
}
}
}
else
{
throw new Exception("Missing devEUI or devAddr");
}
return(results);
}
