Bradley Bennett created GUACAMOLE-2299:
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Summary: Documentation: document macOS VNC paste limitations.
Key: GUACAMOLE-2299
URL: https://issues.apache.org/jira/browse/GUACAMOLE-2299
Project: Guacamole
Issue Type: Task
Affects Versions: 1.6.0, 1.6.1 [staging]
Environment: macOS VNC session.
Reporter: Bradley Bennett
There are inherit *Paste *limitations to the macOS component (*screensharingd*)
that handles 3rd party VNC client sessions. These limitations do not exist when
using the native macOS screen sharing client (*ScreenSharingAgent*).
macOS evidently uses a proprietary RFB (Remote Frame Buffer) protocol,
advertised as version 3.889 during negotiation; 3.8 is the latest. This
extension implements a clipboard mechanism, supporting encrypting clipboard
data as well as different clipboard data types. This protocol extension
defining the APIs used between the Screen Sharing Client and Server processes
(ScreenSharingAgent & screensharingd) is not publicly documented.
macOS apps have essentially 2 clipboard (pasteboard) mechanisms.
* NSPasteboard (Cocoa pasteboard APIs): Used by Cocoa apps, including all
built-in macOS apps.
* Qt QClipboard: Used by Qt apps, e.g. Wireshark, SlickEdit.
* Qt is cross-platform (macOS/Windows/X11) framework.
VNC pasting works for *Qt applications*; does not work for *NSPasteboard
applications*.
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