[kamailio 5.4.3] xavp_rm_by_index removes (N+1) first indexes instead of index N - sr-users

20 Jan 2021

Hello

I’m trying to use function xavp_rm_by_index to remove a specific index from a given
xavp.
I’m observing an unexpected behaviour, I think it might be a bug :
Instead of just removing the index, the function removes the index and all others before
it.

E.g : if called with « idx = 1 », it removes indexes 0 and 1.

Reading the code of xavp_rm_internal (which is called by xavp_rm_by_index), I don’t think
it behaves at it should :

/* Remove xavps
* idx: <0 remove all xavps with the same name
*      >=0 remove only the specified index xavp
* Returns number of xavps that were deleted
*/

For example when I do this :

LM_ERR("COUNT BEFORE: %d\n", xavp_count(rname, NULL));
int rm_count = xavp_rm_by_index(rname, 1, NULL); // TEST
LM_ERR("REMOVED: %d\n", rm_count);
LM_ERR("COUNT AFTER: %d\n", xavp_count(rname, NULL));

« rm_count » returned is 1 (which is expected). However, « count after » is decremented by
2.
And when I look at the contents of my xavp, I notice that the first two elements have been
removed.

Likewise if xavp_rm_by_index is invoked with idx = 2 => the first 3 elements are
removed.

So… do you think this is a bug ? or something I didn’t understand ?

Thanks for your help !

Regards,
Nicolas.

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