Add TLS encryption to LibVNCServer

[bk138]

things to consider

• Channel security #234
• new feature: external socket management system flags #428
• Split library itself and sockets io #432
• libvncclient: add hooks for custom socket I/O #477
• existing libvncclient implementation

todo

• get big picture sorted out
• make an action plan
• execute

[lwcorp]

It's a great misfortune this issue hasn't had a single update in half a decade (mentions aside). Connecting in an insecure way is not just risky, but probably illegal in GDPR, etc. As you can see in the mentions, the Android VLC relies on you for this.

For reference, the VNC variation UltraVNC specifically overcame it by using a DSM (Data Stream Modification) plugin. Since it's open source, could you review it and possibly borrow what you need from there to make it happen? Its source code is downloadable in any UltraVNC download and originally in this archive.

Meanwhile, that's how it looks when you connect without encryption from a secure UltraVNC into a non secure VNC that relies on you: