Avoid generating zero-length packets

I used the construct like f_rnd_octstring(f_rnd_int(100)) in a number
of places to generate random-length packets with randomized length.

The problem I didn't realize is that f_rnd_int() of course can also
return '0', which would generate zero-length packets.  This may be
permitted in some protocols, but it leads to problems e.g. when trying
to send a UDP packet of zero length (which the kernel will not do).

So let's introduce
* f_rnd_int_nonzero() for returning non-zero randomized integers
* f_rnd_octstring_rnd_len() for returning a random-length random payload
  octet string
* replace all f_rnd_octstring(f_rnd_int()) call sites with the new
  function.

Change-Id: I818a113ff8d2a2f7cab2ec7d9c8661607c6331d6
Closes: OS#5528

1 files changed, 1 insertions, 1 deletions

diff --git a/fr/FR_Tests.ttcn b/fr/FR_Tests.ttcn
index b7a56c3b..65029c1b 100644
--- a/fr/FR_Tests.ttcn
+++ b/fr/FR_Tests.ttcn
@@ -276,7 +276,7 @@ private function f_ul2dl_ud(charstring id) runs on UE_CT
 		var integer ran_index := 0;
 		var template (value) PDU_LLC llc_tx;
 		var template (present) PDU_LLC llc_rx_exp;
-		var octetstring llc_payload := f_rnd_octstring(f_rnd_int(max_llc_payload_len));
+		var octetstring llc_payload := f_rnd_octstring_rnd_len(max_llc_payload_len);
 		var PDU_LLC llc_rx;
 		timer T := 5.0;