pespin has submitted this change. ( https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/37259?usp=email )

Change subject: asterisk: Validate precondition in SDP of MT calls ......................................................................

asterisk: Validate precondition in SDP of MT calls

Change-Id: Ibfdc7e61a72655cd89d5d3f0f1d8798325ae1403 --- M asterisk/IMS_ConnectionHandler.ttcn 1 file changed, 71 insertions(+), 2 deletions(-)

Approvals: pespin: Looks good to me, approved Jenkins Builder: Verified

diff --git a/asterisk/IMS_ConnectionHandler.ttcn b/asterisk/IMS_ConnectionHandler.ttcn index 32a35f4..d08dad4 100644 --- a/asterisk/IMS_ConnectionHandler.ttcn +++ b/asterisk/IMS_ConnectionHandler.ttcn @@ -546,6 +546,8 @@

type enumerated IMS_gen_sdp_state { IMS_GEN_SDP_None, + IMS_GEN_SDP_MO_INVITE, + IMS_GEN_SDP_MO_UPDATE, IMS_GEN_SDP_MT_Session_Progress, IMS_GEN_SDP_MT_UPDATE_200OK } @@ -577,6 +579,20 @@ select (st) { case (IMS_GEN_SDP_None) { } + case (IMS_GEN_SDP_MO_INVITE) { + sdp := sdp & + "a=curr:qos local none\r\n" & + "a=curr:qos remote none\r\n" & + "a=des:qos mandatory local sendrecv\r\n" & + "a=des:qos optional remote sendrecv\r\n"; + } + case (IMS_GEN_SDP_MO_UPDATE) { + sdp := sdp & + "a=curr:qos local sendrecv\r\n" & + "a=curr:qos remote none\r\n" & + "a=des:qos mandatory local sendrecv\r\n" & + "a=des:qos mandatory remote sendrecv\r\n"; + } case (IMS_GEN_SDP_MT_Session_Progress) { sdp := sdp & "a=curr:qos local none\r\n" & @@ -998,7 +1014,7 @@ var Via via; var template (omit) Require require := omit; var template (omit) Supported supported := omit; - var charstring tx_sdp := f_gen_sdp(); + var charstring tx_sdp; var default d_trying, d_ringing; var charstring branch_value; var Contact calling_contact; @@ -1024,6 +1040,10 @@ /* indicate the support for "reliable provisional response" * and "preconditions mechanism" */ supported := ts_Supported({ "100rel", "precondition" }); + tx_sdp := f_gen_sdp(IMS_GEN_SDP_MO_INVITE); + } else { + /* Don't add any preconditions to SDP: */ + tx_sdp := f_gen_sdp(IMS_GEN_SDP_None); }

req := ts_SIP_INVITE(g_pars.subscr.cp.sip_call_id, @@ -1046,6 +1066,7 @@ d_trying := activate(as_SIP_ignore_resp(exp));

if (g_pars.subscr.cp.require_precondition_ext) { + var template (present) SDP_attribute_list preconds; /* Rx 183 Session Progress */ exp := tr_SIP_Response_SessionProgress( g_pars.subscr.cp.sip_call_id, @@ -1064,6 +1085,26 @@ } }

+ /* Validate SDP in Session Progress contains the preconditions: + * a=curr:qos local none + * a=curr:qos remote none + * a=des:qos mandatory local sendrecv + * a=des:qos mandatory remote sendrecv + * a=conf:qos remote sendrecv + */ + preconds := superset( + tr_SDP_curr(c_SDP_PRECON_STATUS_TYPE_local, c_SDP_PRECON_DIR_TAG_none), + tr_SDP_curr(c_SDP_PRECON_STATUS_TYPE_remote, c_SDP_PRECON_DIR_TAG_none), + tr_SDP_des(c_SDP_PRECON_STRENGTH_TAG_mandatory, c_SDP_PRECON_STATUS_TYPE_local, c_SDP_PRECON_DIR_TAG_sendrecv), + tr_SDP_des(c_SDP_PRECON_STRENGTH_TAG_mandatory, c_SDP_PRECON_STATUS_TYPE_remote, c_SDP_PRECON_DIR_TAG_sendrecv), + tr_SDP_conf(c_SDP_PRECON_STATUS_TYPE_remote, c_SDP_PRECON_DIR_TAG_sendrecv)); + if (not ispresent(g_pars.subscr.cp.peer_sdp.attributes) or + not match(g_pars.subscr.cp.peer_sdp.attributes, preconds)) { + Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, + log2str(g_name & ": Unexpected precondition attrs in Session Progress : ", + g_pars.subscr.cp.peer_sdp.attributes)); + } + /* Tx PRACK */ req := ts_SIP_PRACK(g_pars.subscr.cp.to_addr.addressField.nameAddr.addrSpec, g_pars.subscr.cp.sip_call_id, @@ -1094,6 +1135,7 @@ as_SIP_expect_resp(exp, fail_others := false);

/* Tx UPDATE */ + tx_sdp := f_gen_sdp(IMS_GEN_SDP_MO_UPDATE); req := ts_SIP_UPDATE(g_pars.subscr.cp.to_addr.addressField.nameAddr.addrSpec, g_pars.subscr.cp.sip_call_id, g_pars.subscr.cp.from_addr, @@ -1116,6 +1158,24 @@ body := ?); as_SIP_expect_resp(exp, fail_others := false);

+ /* Validate SDP in 200 OK (UPDATE) contains the preconditions: + * a=curr:qos local sendrecv + * a=curr:qos remote sendrecv + * a=des:qos mandatory local sendrecv + * a=des:qos mandatory remote sendrecv + */ + preconds := superset( + tr_SDP_curr(c_SDP_PRECON_STATUS_TYPE_local, c_SDP_PRECON_DIR_TAG_sendrecv), + tr_SDP_curr(c_SDP_PRECON_STATUS_TYPE_remote, c_SDP_PRECON_DIR_TAG_sendrecv), + tr_SDP_des(c_SDP_PRECON_STRENGTH_TAG_mandatory, c_SDP_PRECON_STATUS_TYPE_local, c_SDP_PRECON_DIR_TAG_sendrecv), + tr_SDP_des(c_SDP_PRECON_STRENGTH_TAG_mandatory, c_SDP_PRECON_STATUS_TYPE_remote, c_SDP_PRECON_DIR_TAG_sendrecv)); + if (not ispresent(g_pars.subscr.cp.peer_sdp.attributes) or + not match(g_pars.subscr.cp.peer_sdp.attributes, preconds)) { + Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, + log2str(g_name & ": Unexpected precondition attrs in 200 OK (UPDATE): ", + g_pars.subscr.cp.peer_sdp.attributes)); + } + g_pars.subscr.cp.sip_seq_nr := g_rx_sip_resp.msgHeader.cSeq.seqNumber + 1; }

@@ -1136,7 +1196,7 @@ *, "INVITE", 200, g_pars.subscr.cp.sip_seq_nr, "OK", - body := ?); + body := *); as_SIP_expect_resp(exp, fail_others := false);

deactivate(d_trying);