[GUACAMOLE-1048] Support server control commands during handshake

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Done
• Fix Version/s: 1.4.0
• Component/s: guacamole-common
• Assignee: Mike Jumper
• Reporter: Tomer Gabel
• Created: 23/Apr/20 14:08
• Updated: 26/May/21 05:56
• Resolved: 26/May/21 05:56

Description

The current implementation of client handshake in ConfiguredGuacamoleSocket doesn't handle the case where a server sends an error command mid-handshake, which is allowed by the protocol. This hampers error handling/reporting in some cases; for instance, when an invalid connection ID is specified by the select command, a resulting error would be misinterpreted by the client as an unexpected opcode.

Please expect a pull request aimed at improving this situation soon; incidentally, the scenario described above is hypothetical, guacd currently drops the connection instead of sending an error command. This is handled separately in GUACAMOLE-1047.

Issue Links

• relates to: GUACAMOLE-1047 Notify connecting client on unrecognized connection ID