Merge | Remove OS-specific TdsParser files #3469
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This was lingering from earlier work to change the SSPI abstractions
The managed SNI doesn't use this, so will always return SNI_SUCCESS_IO_PENDING.
The handling of this method is unusual. Only Windows actually waits for the SSL handshake.
Also mop up the unused SNIErrorDetails structure
This exposes a behavioural difference in TdsParser between Unix and Windows: downlevel TLS warnings only appear on Windows.
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benrr101
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paulmedynski
approved these changes
Jul 18, 2025
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Description
This picks up where #3434 left off. The earlier PR handled the simple case of merging OS-specific functionality (which was actually just different between the native and managed SNIs.) This one expands the principle, moving
PostReadAsyncForMarsandWaitForSSLHandShakeToCompletefromTdsParsertoTdsParserStateObject's child classes. This removes TdsParser.Unix.cs and TdsParser.Windows.cs.This has also involved modifying the call site for the method within TdsParser to reference TdsParserStateObject. This is particularly noticeable in EnableSsl.
Finally, while it's not a new gap, this process has highlighted that the existing functionality of warning when down-level SSL is in use only functions on Windows. I've maintained this gap and made it a little more explicit.
Issues
Contributes to #1261 and #2953.
Testing
Testing with SSL- and MARS-enabled connection strings works, I'd appreciate a CI run.