osmo-ttcn3-hacks/library/IPA_Emulation.ttcn

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module IPA_Emulation {
import from IPA_Types all;
import from IPA_CodecPort all;
import from IPA_CodecPort_CtrlFunct all;
import from IPL4asp_Types all;
import from MTP3asp_Types all;
import from MTP3asp_PortType all;
import from MGCP_Types all;
/*
modulepar {
}
*/
type enumerated IpaMode {
IPA_MODE_CLIENT,
IPA_MODE_SERVER
}
type record ASP_IPA_Unitdata {
IpaStreamId streamId,
IpaExtStreamId streamIdExt optional,
octetstring payload
}
type port IPA_SP_PT message {
inout ASP_IPA_Unitdata;
} with { extension "internal" }
type port IPA_MGCP_PT message {
inout MgcpCommand, MgcpResponse;
} with { extension "internal" }
type component IPA_Emulation_CT {
/* down-facing port to IPA codec port */
port IPA_CODEC_PT IPA_PORT;
/* up-facing port to SCCP */
port MTP3asp_SP_PT MTP3_SP_PORT;
/* up-facing port for MGCP */
port IPA_MGCP_PT IPA_MGCP_PORT;
/* up-facing port for other streams */
port IPA_SP_PT IPA_SP_PORT;
var boolean g_initialized := false;
var ConnectionId g_ipa_conn_id := -1;
/* Are we a BSC/MGW (truel) or MSC (false) */
var boolean g_is_bsc_mgw;
var IpaMode g_mode;
}
function f_connect(charstring remote_host, PortNumber remote_port,
charstring local_host, PortNumber local_port) runs on IPA_Emulation_CT {
var Result res;
res := IPA_CodecPort_CtrlFunct.f_IPL4_connect(IPA_PORT, remote_host, remote_port,
local_host, local_port, 0, { tcp:={} });
g_ipa_conn_id := res.connId;
g_is_bsc_mgw := true;
}
function f_bind(charstring local_host, PortNumber local_port) runs on IPA_Emulation_CT {
var Result res;
res := IPA_CodecPort_CtrlFunct.f_IPL4_listen(IPA_PORT,
local_host, local_port, { tcp:={} });
g_ipa_conn_id := res.connId;
g_is_bsc_mgw := false;
}
template ASP_MTP3_TRANSFERind ts_MTP3_XFER_ind(integer opc, octetstring data) := {
sio := { '10'B, '00'B, '0011'B },
opc := opc,
dpc := 0,
sls := 0,
data := data
}
private template IpaCcmRespPart t_IdRespPart(IpaCcmIdTag tag, charstring payload) := {
len := 0, /* overwritten by codec */
tag := tag,
data := payload
}
/* build IPA CCM ID RESP response from IPA CCM GET */
private function f_ccm_make_id_resp(PDU_IPA_CCM get) return PDU_IPA_CCM {
var integer i;
var PDU_IPA_CCM resp := {
msg_type := IPAC_MSGT_ID_RESP,
u := {
resp := {}
}
}
for (i := 0; i < sizeof(get.u.get); i := i + 1) {
var IpaCcmIdTag tag := get.u.get[i].tag;
var charstring foo;
select (tag) {
case (IPAC_IDTAG_UNIT) {
foo := "0/1/2";
}
case (IPAC_IDTAG_UNITNAME) {
foo := "mahlzeit";
}
case else {
foo := "foo";
}
}
resp.u.resp[sizeof(resp.u.resp)] := valueof(t_IdRespPart(tag, foo));
}
return resp;
}
/* transmit IPA CCM message */
private function f_ccm_tx(PDU_IPA_CCM ccm) runs on IPA_Emulation_CT {
var IPA_Send ipa_tx := valueof(t_IPA_Send(g_ipa_conn_id, IPAC_PROTO_CCM, enc_PDU_IPA_CCM(ccm)));
log("CCM Tx:", ccm);
IPA_PORT.send(ipa_tx);
}
template PDU_IPA_CCM ts_IPA_PONG := {
msg_type := IPAC_MSGT_PONG,
u := omit
}
template PDU_IPA_CCM ts_IPA_ACK := {
msg_type := IPAC_MSGT_ID_ACK,
u := omit
}
template PDU_IPA_CCM ts_IPA_ID_GET := {
msg_type := IPAC_MSGT_ID_GET,
u := {
get := {
{ 1, IPAC_IDTAG_UNITNAME }
}
}
}
/* receive IPA CCM message */
private function f_ccm_rx(PDU_IPA_CCM ccm) runs on IPA_Emulation_CT {
select (ccm.msg_type) {
case (IPAC_MSGT_PING) {
f_ccm_tx(valueof(ts_IPA_PONG));
}
case (IPAC_MSGT_ID_ACK) {
f_ccm_tx(valueof(ts_IPA_ACK));
}
case (IPAC_MSGT_ID_GET) {
f_ccm_tx(f_ccm_make_id_resp(ccm));
}
case else {
log("Unknown/unsupported IPA CCM message type", ccm);
}
}
}
private function f_to_asp(IPA_RecvFrom ipa_rx) return ASP_IPA_Unitdata {
var ASP_IPA_Unitdata ret := {
streamId := ipa_rx.streamId,
streamIdExt := ipa_rx.streamIdExt,
payload := ipa_rx.msg
}
return ret;
}
private function f_from_asp(ConnectionId connId, ASP_IPA_Unitdata ipa_tx) return IPA_Send {
var IPA_Send ret := valueof(t_IPA_Send(connId, ipa_tx.streamId, ipa_tx.payload,
ipa_tx.streamIdExt));
return ret;
}
function main_client(charstring remote_host, PortNumber remote_port,
charstring local_host, PortNumber local_port) runs on IPA_Emulation_CT {
g_mode := IPA_MODE_CLIENT;
f_connect(remote_host, remote_port, local_host, local_port);
ScanEvents();
}
function main_server(charstring local_host, PortNumber local_port) runs on IPA_Emulation_CT {
g_mode := IPA_MODE_SERVER;
f_bind(local_host, local_port);
ScanEvents();
}
private function f_mgcp_to_user(octetstring msg) runs on IPA_Emulation_CT {
var charstring msg_ch := oct2char(msg);
if (g_is_bsc_mgw) {
log("============");
log(msg_ch);
IPA_MGCP_PORT.send(dec_MgcpCommand(msg_ch));
} else {
IPA_MGCP_PORT.send(dec_MgcpResponse(msg_ch));
}
}
private function ScanEvents() runs on IPA_Emulation_CT {
var IPA_RecvFrom ipa_rx;
var ASP_IPA_Unitdata ipa_ud;
var ASP_MTP3_TRANSFERreq mtp_req;
var ASP_Event asp_evt;
var MgcpCommand mgcp_cmd;
var MgcpResponse mgcp_rsp;
while (true) {
alt {
/* Received IPA -> up into SCCP stack */
[] IPA_PORT.receive(IPA_RecvFrom: ?) -> value ipa_rx {
select (ipa_rx.streamId) {
case (IPAC_PROTO_CCM) {
var PDU_IPA_CCM ccm := dec_PDU_IPA_CCM(ipa_rx.msg);
log("CCM Rx:", ccm);
f_ccm_rx(ccm);
} case (IPAC_PROTO_SCCP) {
var ASP_MTP3_TRANSFERind mtp;
mtp := valueof(ts_MTP3_XFER_ind(0, ipa_rx.msg));
MTP3_SP_PORT.send(mtp);
} case (IPAC_PROTO_MGCP_OLD) {
f_mgcp_to_user(ipa_rx.msg);
} case (IPAC_PROTO_OSMO) {
select (ipa_rx.streamIdExt) {
case (IPAC_PROTO_EXT_MGCP) {
f_mgcp_to_user(ipa_rx.msg);
} case else {
IPA_SP_PORT.send(f_to_asp(ipa_rx));
}
}
} case else {
IPA_SP_PORT.send(f_to_asp(ipa_rx));
}
}
}
/* server only */
[] IPA_PORT.receive(ASP_Event:{connOpened:=?}) -> value asp_evt {
log("IPA: Connected");
g_ipa_conn_id := asp_evt.connOpened.connId;
if (g_mode == IPA_MODE_SERVER) {
f_ccm_tx(valueof(ts_IPA_ID_GET));
}
}
[] IPA_PORT.receive(ASP_Event:{connClosed:=?}) -> value asp_evt {
log("IPA: Closed");
g_ipa_conn_id := -1;
self.stop;
}
/* Received SCCP -> down into IPA */
[] MTP3_SP_PORT.receive(ASP_MTP3_TRANSFERreq: ?) -> value mtp_req {
var IPA_Send ipa_tx := valueof(t_IPA_Send(g_ipa_conn_id, IPAC_PROTO_SCCP,
mtp_req.data));
IPA_PORT.send(ipa_tx);
}
/* Received MGCP -> down into IPA */
[] IPA_MGCP_PORT.receive(MgcpCommand:?) -> value mgcp_cmd {
ipa_ud := {
streamId := IPAC_PROTO_OSMO,
streamIdExt := IPAC_PROTO_EXT_MGCP,
payload := char2oct(enc_MgcpCommand(mgcp_cmd))
}
IPA_PORT.send(f_from_asp(g_ipa_conn_id, ipa_ud));
}
[] IPA_MGCP_PORT.receive(MgcpResponse:?) -> value mgcp_rsp {
ipa_ud := {
streamId := IPAC_PROTO_OSMO,
streamIdExt := IPAC_PROTO_EXT_MGCP,
payload := char2oct(enc_MgcpResponse(mgcp_rsp))
}
IPA_PORT.send(f_from_asp(g_ipa_conn_id, ipa_ud));
}
/* Received MISC (RSL/OML/CTRL) -> down into IPA */
[] IPA_SP_PORT.receive(ASP_IPA_Unitdata: ?) -> value ipa_ud {
IPA_PORT.send(f_from_asp(g_ipa_conn_id, ipa_ud));
}
}
}
}
}