Werk #13865: Agent controller on Unix: Deny registration if agent socket is not operational

Component	Checks & agents
Title	Agent controller on Unix: Deny registration if agent socket is not operational
Date	Apr 22, 2022
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0b9 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Upon startup, the agent controller (cmk-agent-ctl) now checks if the agent socket is operational on Unix systems. If not, we refuse the agent registration (subcommands register, import), because a non- operational socket can hint at xinetd systems. On such systems, a successful registration would mislead the user into believing that the agent communication is now TLS-encrypted, which is not the case.

Furthermore, the operational status of the agent socket is also reported by the status subcommand.

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