public async Task <ISnmpMessage?> SetV3TsmAsync <T>(IPAddress ip, string oid, int retries, int port, TimeSpan timeout,
X509Certificate2 certificate, TimeSpan connectionTimeout, T setValue)
{
if (ip == null)
{
throw new ArgumentNullException(nameof(ip));
}
if (string.IsNullOrWhiteSpace(oid))
{
throw new ArgumentNullException(nameof(oid));
}
if (!Regex.IsMatch(oid, @"^(([0-9]+)\.)+[0-9]+$"))
{
throw new ArgumentException(oid, nameof(oid));
}
if (port <= 0)
{
throw new ArgumentOutOfRangeException(nameof(port), port.ToString());
}
if (retries <= 0)
{
throw new ArgumentOutOfRangeException(nameof(retries), retries.ToString());
}
if (timeout <= TimeSpan.Zero)
{
throw new ArgumentOutOfRangeException(nameof(timeout), timeout.ToString());
}
if (connectionTimeout <= TimeSpan.Zero)
{
throw new ArgumentOutOfRangeException(nameof(connectionTimeout));
}
if (certificate is null)
{
throw new ArgumentNullException(nameof(certificate));
}
var startDate = DateTime.Now;
var snmpType = "SET";
var snmpVersion = $"3 {SecurityModel.Tsm}";
var attempt = 0;
ISnmpMessage?response = null;
while (attempt < retries)
{
var setValueByType = setValue switch
{
int x => new Variable(new ObjectIdentifier(oid), new Integer32(x)),
string x => new Variable(new ObjectIdentifier(oid), new OctetString(x)),
IPAddress x => new Variable(new ObjectIdentifier(oid), new IP(x.ToString())),
uint x => new Variable(new ObjectIdentifier(oid), new Gauge32(x)),
byte[] x => new Variable(new ObjectIdentifier(oid), new OctetString(x)),
_ => throw new ArgumentOutOfRangeException(nameof(setValue)),
};
try
{
var receiver = new IPEndPoint(ip, port);
var clientEndPoint = ip.AddressFamily == AddressFamily.InterNetwork
? new IPEndPoint(IPAddress.Any, 0) : new IPEndPoint(IPAddress.IPv6Any, 0);
var vList = new List <Variable>()
{
setValueByType
};
var chain = new X509Chain();
chain.Build(certificate);
using var client = new Client(clientEndPoint);
client.LoadX509Certificate(chain);
client.SupportedCipherSuites.Add(TCipherSuite.TLS_RSA_WITH_AES_256_CBC_SHA);
var auth = TsmAuthenticationProvider.Instance;
IPrivacyProvider priv = new TsmPrivacyProvider(auth);
var request = new SetRequestMessage(VersionCode.V3, Messenger.NextMessageId, Messenger.NextRequestId, OctetString.Empty, vList, priv, Messenger.MaxMessageSize);
response = await request.GetSecureResponseAsync(connectionTimeout, timeout, receiver, client).ConfigureAwait(false);
if (response is ReportMessage)
{
if (response.Pdu().Variables.Count == 0)
{
throw new Exception("wrong report message received");
}
var id = response.Pdu().Variables[0].Id;
if (id != Messenger.NotInTimeWindow)
{
var error = id.GetErrorMessage();
throw new Exception($"ERROR: {error}");
}
var request2 = new GetRequestMessage(VersionCode.V3, Messenger.NextMessageId, Messenger.NextRequestId, OctetString.Empty, OctetString.Empty, vList, priv, Messenger.MaxMessageSize, response);
response = await request2.GetSecureResponseAsync(connectionTimeout, timeout, receiver, client).ConfigureAwait(false);
}
break;
}
catch (Exception ex) when(ex is SnmpException || ex is SocketException || ex is OperationCanceledException || ex is System.TimeoutException)
{
if (ex is System.TimeoutException && ex.Message == "Could Not Connect To Server")
{
_Logger.LogInformation($"{ip} - DTLS failed {attempt + 1} time(s)");
}
await _SnmpLog.LogTransactionAsync(startDate, ip.ToString(), oid, null, snmpType, snmpVersion, ex.GetType().ToString(), ex.Message).ConfigureAwait(false);
++attempt;
if (attempt >= retries)
{
throw;
}
}
}
if (response is null)
{
await _SnmpLog.LogTransactionAsync(startDate, ip.ToString(), oid, null, snmpType, snmpVersion, SnmpType.Null.ToString(), null).ConfigureAwait(false);
return(response);
}
var type = response.Pdu().TypeCode;
var data = response.Pdu().ErrorStatus;
await _SnmpLog.LogTransactionAsync(startDate, ip.ToString(), oid, null, snmpType, snmpVersion, type.ToString(), data.ToString()).ConfigureAwait(false);
return(response);
}
public async Task <Variable?> GetV3TsmAsync(IPAddress ip, string oid, int retries, int port, TimeSpan timeout,
X509Certificate2 certificate, TimeSpan connectionTimeout)
{
if (ip == null)
{
throw new ArgumentNullException(nameof(ip));
}
if (string.IsNullOrWhiteSpace(oid))
{
throw new ArgumentNullException(nameof(oid));
}
if (!Regex.IsMatch(oid, @"^(([0-9]+)\.)+[0-9]+$"))
{
throw new ArgumentException(oid, nameof(oid));
}
if (port <= 0)
{
throw new ArgumentOutOfRangeException(nameof(port), port.ToString());
}
if (retries <= 0)
{
throw new ArgumentOutOfRangeException(nameof(retries), retries.ToString());
}
if (timeout <= TimeSpan.Zero)
{
throw new ArgumentOutOfRangeException(nameof(timeout), timeout.ToString());
}
if (connectionTimeout <= TimeSpan.Zero)
{
throw new ArgumentOutOfRangeException(nameof(connectionTimeout));
}
if (certificate is null)
{
throw new ArgumentNullException(nameof(certificate));
}
var startDate = DateTime.Now;
var snmpType = "GET";
var snmpVersion = $"3 {SecurityModel.Tsm}";
var attempt = 0;
IEnumerable <Variable> reply = new List <Variable>();
while (attempt < retries)
{
try
{
var receiver = new IPEndPoint(ip, port);
var clientEndPoint = ip.AddressFamily == AddressFamily.InterNetwork
? new IPEndPoint(IPAddress.Any, 0) : new IPEndPoint(IPAddress.IPv6Any, 0);
var vList = new List <Variable>()
{
new Variable(new ObjectIdentifier(oid))
};
var chain = new X509Chain();
chain.Build(certificate);
using var client = new Client(clientEndPoint);
client.LoadX509Certificate(chain);
client.SupportedCipherSuites.Add(TCipherSuite.TLS_RSA_WITH_AES_256_CBC_SHA);
var auth = TsmAuthenticationProvider.Instance;
IPrivacyProvider priv = new TsmPrivacyProvider(auth);
var request = new GetRequestMessage(VersionCode.V3, Messenger.NextMessageId, Messenger.NextRequestId, OctetString.Empty, vList, priv, Messenger.MaxMessageSize);
ISnmpMessage response = await request.GetSecureResponseAsync(connectionTimeout, timeout, receiver, client).ConfigureAwait(false);
if (response is ReportMessage)
{
if (response.Pdu().Variables.Count == 0)
{
throw new Exception("wrong report message received");
}
var id = response.Pdu().Variables[0].Id;
if (id != Messenger.NotInTimeWindow)
{
var error = id.GetErrorMessage();
throw new Exception($"ERROR: {error}");
}
// according to RFC 3414, send a second request to sync time.
var request2 = new GetRequestMessage(VersionCode.V3, Messenger.NextMessageId, Messenger.NextRequestId, OctetString.Empty, OctetString.Empty, vList, priv, Messenger.MaxMessageSize, response);
response = await request2.GetSecureResponseAsync(connectionTimeout, timeout, receiver, client).ConfigureAwait(false);
}
else if (response.Pdu().ErrorStatus.ToInt32() != 0) // != ErrorCode.NoError
{
throw ErrorException.Create(
"error in response",
receiver.Address,
response);
}
reply = response.Pdu().Variables;
break;
}
catch (Exception ex) when(ex is SnmpException || ex is SocketException || ex is OperationCanceledException || ex is System.TimeoutException)
{
if (ex is System.TimeoutException && ex.Message == "Could Not Connect To Server")
{
_Logger.LogInformation($"{ip} - DTLS failed {attempt + 1} time(s)");
}
await _SnmpLog.LogTransactionAsync(startDate, ip.ToString(), oid, null, snmpType, snmpVersion, ex.GetType().ToString(), ex.Message).ConfigureAwait(false);
++attempt;
if (attempt >= retries)
{
throw;
}
}
}
var type = string.Empty;
var data = string.Empty;
foreach (var res in reply)
{
type += res.Data.TypeCode;
data += res.Data.ToString();
}
await _SnmpLog.LogTransactionAsync(startDate, ip.ToString(), oid, null, snmpType, snmpVersion, type, data).ConfigureAwait(false);
return(reply.FirstOrDefault());
}