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fixeria has posted comments on this change by fixeria. ( 
https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/38745?usp=email )

Change subject: epdg: fix a DTE in as_GSUP_rx_CL_REQ
......................................................................


Patch Set 1:

(2 comments)

Commit Message:

https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/38745/comment/69aa0b58_736edf0d?usp=email
 :
PS1, Line 11: does not properly handle the '*' template kind:
> why not making handling the "*" case in this patch properly instead?
Because this again brings us to the topic of optional IEs in a `record of`. 
With the current limitations of TTCN-3, it's not possible to implement handling 
of `*` properly. See related discussion in 
https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/38586.


File epdg/EPDG_Tests.ttcn:

https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/38745/comment/6b300970_7ad998dc?usp=email
 :
PS1, Line 948:  [] GSUP.receive(tr_GSUP_CL_REQ(g_pars.imsi, dom := omit, ctype 
:= ctype)) -> value rx_gsup;
> if it's possible that the domain is not transmitted, why not changing 
> tr_GSUP_CL_REQ() to accept a " […]
Please take a chance to read the code yourself a bit...

`tr_GSUP_CL_REQ` already does accept a template without any restrictions, so 
the given parameter can be anything. Otherwise my code passing `omit` here 
would cause another DTE.

The problem is actually in `f_gen_tr_ies()`, which is called by 
`tr_GSUP_CL_REQ` to generate a `record of` IEs. This is where the violation of 
`template (present)` was happening:

```
1300         if (not istemplatekind(cn_domain, "omit")) {
1301                 ies[idx] := tr_GSUP_IE_CnDomain(cn_domain);
1302                 idx := idx + 1;
1303         }
```

This logic works for `omit`, `?`, and for values, but not for `*`. Before my 
51490419 ("library/gsup: improve GSUP_IE templates") this code was passing `*` 
to `tr_GSUP_IE_CnDomain`, which was wrong and basically eqiovalent to 
`tr_GSUP_IE_CnDomain(?)`.

NOTE: I am not the author of `f_gen_{tr,ts}_ies` and not planning to refactor 
it.



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