[sr-dev] [kamailio/kamailio] [WIP] tls: add support for OpenSSL engine and private keys in HSM (#1484)

[Henning Westerholt]

Sorry for the late reply, was yesterday pretty busy as well.

Generally speaking, these are the different approaches that modules use for data access in kamailio child processes:

* all children needs to access to a one shared data structure
  Create one global structure in mod_init in shm_memory, and then access it from different children.
  Protect the (possible) concurrent access with locks, if you support run-time modification of this data.
  You find examples in the carrierroute module, mod_init() -> init_route_data() and its reload 
  functions and other modules.

* All children needs access to a individual local data set
  Just allocate it in pkg_memory and access it from the children individually.
  You can find an example in the auth_diameter module, auth_diameter.c mod_child_init() function.

* All children needs access to all local sets
  Then you need to implement a solution like you choose with a shared data structure, e.g. in a hash 
  table that you write in child_init to. I did not fully understand why you need this here, maybe you can 
  elaborate a bit on the requirements of the HSM child_init.

I have another remark about the hash table you' added. The hash table uses system malloc() to allocate memory. Please change this to pkg_memory, if you need per-process individual memory, or shm_memory for shared memory. If you have more detailed questions, feel free to contact me per e-mail as well (hw at kamailio dot org).

@miconda - as you currently traveling, I can do the further processing of this patch, no need to hurry from your side.

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