[FB-Tracker] Created: (DNET-716) Connection to Firebird throws NullReferenceException on mono

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[FB-Tracker] Created: (DNET-716) Connection to Firebird throws NullReferenceException on mono

JIRA tracker@firebirdsql.org
Connection to Firebird throws NullReferenceException on mono
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                 Key: DNET-716
                 URL: http://tracker.firebirdsql.org/browse/DNET-716
             Project: .NET Data provider
          Issue Type: Bug
          Components: ADO.NET Provider
    Affects Versions: 5.6.0.0
         Environment: kubuntu 16.04 x64 + mono 4.6.1 + FirebirdSQL ADO.NET driver 5.6.0.0
            Reporter: Anton Kasyanov
            Assignee: Jiri Cincura


An attempt to connect to the Firebird databse results in an NullReferenceException with the following stacktrace:

  at System.Text.Encoding.GetBytes (System.String s) [0x00015] in <dca3b561b8ad4f9fb10141d81b39ff45>:0
  at FirebirdSql.Data.Client.Managed.GdsConnection.UserIdentificationData () [0x00141] in <1c49352b896a4a9dba73865ddab7b59e>:0
  at FirebirdSql.Data.Client.Managed.GdsConnection.Identify (System.String database) [0x00044] in <1c49352b896a4a9dba73865ddab7b59e>:0
  at FirebirdSql.Data.FirebirdClient.ClientFactory.CreateManagedDatabase (FirebirdSql.Data.FirebirdClient.FbConnectionString options) [0x00042] in <1c49352b896a4a9dba73865ddab7b59e>:0
  at FirebirdSql.Data.FirebirdClient.ClientFactory.CreateDatabase (FirebirdSql.Data.FirebirdClient.FbConnectionString options) [0x00010] in <1c49352b896a4a9dba73865ddab7b59e>:0
  at FirebirdSql.Data.FirebirdClient.FbConnectionInternal.Connect () [0x0001e] in <1c49352b896a4a9dba73865ddab7b59e>:0
  at FirebirdSql.Data.FirebirdClient.FbConnectionPoolManager+Pool.CreateNewConnection (FirebirdSql.Data.FirebirdClient.FbConnectionString connectionString) [0x00006] in <1c49352b896a4a9dba73865ddab7b59e>:0
  at FirebirdSql.Data.FirebirdClient.FbConnectionPoolManager+Pool.CreateNewConnectionIfPossibleImpl (FirebirdSql.Data.FirebirdClient.FbConnectionString connectionString) [0x00020] in <1c49352b896a4a9dba73865ddab7b59e>:0
  at FirebirdSql.Data.FirebirdClient.FbConnectionPoolManager+Pool.GetConnection (FirebirdSql.Data.FirebirdClient.FbConnection owner) [0x00024] in <1c49352b896a4a9dba73865ddab7b59e>:0
  at FirebirdSql.Data.FirebirdClient.FbConnectionPoolManager.Get (FirebirdSql.Data.FirebirdClient.FbConnectionString connectionString, FirebirdSql.Data.FirebirdClient.FbConnection owner) [0x00035] in <1c49352b896a4a9dba73865ddab7b59e>:0
  at FirebirdSql.Data.FirebirdClient.FbConnection.Open () [0x00086] in <1c49352b896a4a9dba73865ddab7b59e>:0

The exception is thrown at the line

private byte[] UserIdentificationData()
{
...
  var user = Encoding.UTF8.GetBytes(Environment.GetEnvironmentVariable("USERNAME"));
...
}

of the class FirebirdSql.Data.Client.Managed.GdsConnection

Earlier this method used Environment.UserName in this line, however this was changed by the commit https://github.com/cincuranet/FirebirdSql.Data.FirebirdClient/commit/7e1e4a1e1eb362c2c96a141a51952b23c9970f79

The USERNAME environment variable is not set in linux bu default. Setting it hides the issue and can be considered as a workaround.

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