Osmocom Libraries » libosmo-netif

The following functions in libosmo-netif do indeed look suspicious (as in, they expect to parse an IPA message from a single msgb):

osmo_ipa_process_msg()
osmo_ipa_parse_msg_id_resp()
osmo_ipa_rcvmsg_base()

Are the any others?

From the above list, only osmo_ipa_process_msg() is actually used outside of libosmo-netif itself:

libosmo-sccp/src/osmo_ss7.c: if (osmo_ipa_process_msg(msg) < 0) {
libosmo-sccp/src/osmo_ss7.c: if (osmo_ipa_process_msg(msg) < 0) {

In both instances, ipa_msg_recv_buffered() is already used immediately before calling into libosmo-netif.

Harald suggests we should have a TTCN3 test which "stutters" during IPA communication, i.e. sends incomplete IPA messages across a TCP connection.

Initial version of an IPA test suite has been proposed: https://gerrit.osmocom.org/#/c/osmo-ttcn3-hacks/+/11241

A first test has now been merged to osmo-ttcn3-hacks master.
This test performs a byte-per-byte transmission of an IPA ping and expects a pong response.
Currently only the BSC is tested, as an IPA server on OML and RSL ports.
More tests to follow.

Another test for the BTS test suite has been proposed: https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/11356

The BSC control interface now supports IPA ping:
https://gerrit.osmocom.org/c/libosmocore/+/11287
https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/11288

Another test case (chopped payload) has been proposed: https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/11357

BSC and BTS are being tested since above patches have been merged.

Which other components should be tested?

Closing this. If more tests are needed, please file a new issue or just re-open this one and add your suggestions here.