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mod_saslauth, mod_c2s: Disable tls-server-end-point channel binding by default This channel binding method is now enabled when a hash is manually set in the config, or it attempts to discover the hash automatically if the value is the special string "auto". A related change to mod_c2s prevents complicated certificate lookups in the client connection hot path - this work now happens only when this channel binding method is used. I'm not aware of anything else that uses ssl_cfg (vs ssl_ctx). Rationale for disabling by default: - Minor performance impact in automatic cert detection - This method is weak against a leaked/stolen private key (other methods such as 'tls-exporter' would not be compromised in such a case) Rationale for keeping the implementation: - For some deployments, this may be the only method available (e.g. due to TLS offloading in another process/server).

No 'to' attribute:
	IQ:			Pass to appropriate handler
	Presence:		Broadcast to contacts
				- if initial presence, also send out presence probes
					- if probe would be to local user, generate presence stanza for them
	Message:		Route as if it is addressed to the bare JID of the sender

To a local host:
	IQ:			Pass to appropriate handler
	Presence:		-
	Message:		Deliver to admin?

To local contact:
	Bare JID:
		IQ:		Pass to appropriate handler
		Presence:	Broadcast to all resources
		Message:	Route to 'best' resource
	Full JID:
		IQ:		Send to resource
		Presence:	Send to resource
		Message:	Send to resource
	Full JID but resource not connected:
		IQ:		Return service-unavailable
		Message:	Handle same as if to bare JID
		Presence:	Drop (unless type=subscribe[ed])

To remote contact:
	Initiate s2s connection if necessary
	Send stanza across