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Enhancing back-sock to use JSON


I have made some enhancements to back-sock to use JSON for the passed data and JSON-RPC
to map LDAP calls to method invocations. The function signatures of the JSON-RPC calls
are modeled to be similar to the ones used in json2ldap (which does just the opposite
direction to talk LDAP via JSON-RPC) [1]. The previous hand-crafted format passed on the
socket was harder to parse and needed a manually built parser whereas now a standard
library can be used. However, handling the JSON data structures now imposes an additional
dependency to Jansson (a JSON access library in C) [2]. Jansson itself is leightweight and
has no dependencies itself. Due to the limited use of back-sock and the enhanced ease of
use I think it would be acceptable to add this dependency.

I would be glad if the modification would be possible to be applied to OpenLDAP and I
happily submit a patch.

Best regards

  -- Dago

[1] JSON2LDAP interface from JSON-RPC to LDAP

[2] Jansson, a C library for reading and writing JSON data structures

"You don't become great by trying to be great, you become great by wanting to do something,
and then doing it so hard that you become great in the process." - xkcd #896

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