0008225: Upgrade of .NET MySql Connector to v 6.9.9 doesn't handle unix sockets in ConnectionString - MantisBT

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ID

Project

Category

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Date Submitted

Last Update

0008225

opensim

[REGION] OpenSim Core

public

2017-07-31 17:07

2020-06-09 10:07

Reporter

colosi

Assigned To

Priority

none

Severity

block

Reproducibility

always

Status

new

Resolution

not fixable

Platform

OS

*nix

OS Version

Product Version

0.9.0

Target Version

Fixed in Version

Summary

0008225: Upgrade of .NET MySql Connector to v 6.9.9 doesn't handle unix sockets in ConnectionString

Description

This is a bug in the version of the MySql connector which to my knowledge still exists in 6.10.0, but when it is fixed, we should upgrade this again.

The MySql connector ignores the Protocol = unix component of the ConnectionString, treats the socket like it's a url and tries to do a DNS lookup which fails and causes a crash. This bug has been reported here: https://bugs.mysql.com/bug.php?id=84255 [^]

Steps To Reproduce

In the [DatabaseService] section of StandaloneCommon.ini or the equivalent robust/hg ini, set the ConnectionString to use 'Protocol = unix' and 'Data Source = <unix socket path>' like the following:
ConnectionString = "Data Source=/Applications/MAMP/tmp/mysql/mysql.sock;Protocol=unix;Database=osdb;User ID=osuser;Password=mySecPW;Old Guids=true;"

Additional Information

This is the stack trace produced:

[SERVICE BASE]: Failed to load plugin OpenSim.Region.Framework.Interfaces.ISimulationDataStore from OpenSim.Data.MySQL.dll with args Data Source=/Applications/MAMP/tmp/mysql/mysql.sock;Protocol=unix;Database=osdb;User ID=osuser;Password=mySecPW;Old Guids=true;System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> MySql.Data.MySqlClient.MySqlException: Unable to connect to any of the specified MySQL hosts. ---> System.Net.Sockets.SocketException: Could not resolve host '/Applications/MAMP/tmp/mysql/mysql.sock'
  at System.Net.Dns.Error_11001 (System.String hostName) <0x30ff4b0 + 0x0006b> in <filename unknown>:0
  at System.Net.Dns.GetHostByName (System.String hostName) <0x30fd608 + 0x00057> in <filename unknown>:0
  at System.Net.Dns.GetHostEntry (System.String hostNameOrAddress) <0x30fd478 + 0x0008b> in <filename unknown>:0
  at MySql.Data.Common.MyNetworkStream.GetHostEntry (System.String hostname) <0x30fbdc8 + 0x0002b> in <filename unknown>:0
  at MySql.Data.Common.MyNetworkStream.CreateStream (MySql.Data.MySqlClient.MySqlConnectionStringBuilder settings, Boolean unix) <0x30fbc50 + 0x0003f> in <filename unknown>:0
  at MySql.Data.Common.StreamCreator.GetUnixSocketStream (MySql.Data.MySqlClient.MySqlConnectionStringBuilder settings) <0x30fbb88 + 0x00027> in <filename unknown>:0
  at MySql.Data.Common.StreamCreator.GetStream (MySql.Data.MySqlClient.MySqlConnectionStringBuilder settings) <0x30fba28 + 0x0004b> in <filename unknown>:0
  at MySql.Data.MySqlClient.NativeDriver.Open () <0x30fb000 + 0x00027> in <filename unknown>:0
  --- End of inner exception stack trace ---
  at MySql.Data.MySqlClient.NativeDriver.Open () <0x30fb000 + 0x000f3> in <filename unknown>:0
  at MySql.Data.MySqlClient.Driver.Open () <0x2e45850 + 0x00039> in <filename unknown>:0
  at MySql.Data.MySqlClient.Driver.Create (MySql.Data.MySqlClient.MySqlConnectionStringBuilder settings) <0x2e41770 + 0x00136> in <filename unknown>:0
  --- End of inner exception stack trace ---
  at System.Reflection.MonoCMethod.InternalInvoke (System.Object obj, System.Object[] parameters) <0x1a56c50 + 0x0007b> in <filename unknown>:0
  at System.Reflection.MonoCMethod.DoInvoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) <0x1a56ae0 + 0x000c6> in <filename unknown>:0
  at System.Reflection.MonoCMethod.Invoke (BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) <0x1a56d00 + 0x00041> in <filename unknown>:0
  at System.RuntimeType.CreateInstanceImpl (BindingFlags bindingAttr, System.Reflection.Binder binder, System.Object[] args, System.Globalization.CultureInfo culture, System.Object[] activationAttributes, System.Threading.StackCrawlMark& stackMark) <0x1887740 + 0x00549> in <filename unknown>:0

Tags

No tags attached.

Git Revision or version number

52d4cf692caf4907e22089733fea080a081e3233

Run Mode

Standalone (1 Region)

Physics Engine

BulletSim

Script Engine

Environment

Mono / OSX

Mono Version

Other

Viewer

Relationships

Notes
(0032231) UbitUmarov (administrator) 2017-08-01 05:34	.NET MySql Connector to v 6.9.9 is the most recent version that still supports servers 5.0 https://dev.mysql.com/doc/connector-net/en/connector-net-versions.html [^] and from bug report you show, is not clear 6.10 did fix it. at this point, you can use another version, either the one provided in 0.8.2 or one from: https://dev.mysql.com/downloads/connector/net/ [^]

(0032232) colosi (reporter) 2017-08-01 11:53	I switched to using a tcp port on localhost, so this is working for me now; but I wanted it documented in case anyone else runs into it. Now that I've found workaround and you've mentioned another, I'll lower the priority. Hopefully, at some point, they'll release a new version where this is fixed and we can upgrade then. Nothing to do until then.

(0036536) Gwyneth Llewelyn (reporter) 2020-06-09 10:07	Still not fixed? There are good reasons for using a Unix socket as opposed to a TCP socket as a 'workaround' — namely, a certain degree of security (the MySQL server is not exposed to the public Internet 'by mistake'). Here are my findings, basically replicating what @colosi reported: http://opensimulator.org/wiki/Talk:Database_Settings [^] This is the _first_ MySQL connection implementation that I've found that does _not_ support connection through a Unix socket! (formerly, I used a different MySQL configuration, which did require TCP sockets for remote sync'ing, so I wasn't aware of this issue until today)

Issue History
Date Modified	Username	Field	Change
2017-07-31 17:07	colosi	New Issue
2017-07-31 17:47	colosi	Git Revision or version number	=> 52d4cf692caf4907e22089733fea080a081e3233
2017-07-31 17:47	colosi	Priority	low => normal
2017-08-01 05:34	UbitUmarov	Note Added: 0032231
2017-08-01 11:53	colosi	Note Added: 0032232
2017-08-01 11:54	colosi	Priority	normal => none
2017-08-01 11:54	colosi	Resolution	open => not fixable
2020-06-09 10:07	Gwyneth Llewelyn	Note Added: 0036536

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