| module MNCC_Emulation { |
| |
| /* MNCC Emulation, runs on top of MNCC_CodecPort. It multiplexes/demultiplexes |
| * the individual calls, so there can be separate TTCN-3 components handling |
| * each of the calls |
| * |
| * The MNCC_Emulation.main() function processes MNCC primitives from the MNCC |
| * socket via the MNCC_CodecPort, and dispatches them to the per-connection components. |
| * |
| * Outbound MNCC connections are initiated by sending a MNCC_Call_Req primitive |
| * to the component running the MNCC_Emulation.main() function. |
| * |
| * For each new inbound connections, the MnccOps.create_cb() is called. It can create |
| * or resolve a TTCN-3 component, and returns a component reference to which that inbound |
| * connection is routed/dispatched. |
| * |
| * If a pre-existing component wants to register to handle a future inbound call, it can |
| * do so by registering an "expect" with the expected destination phone number. This is e.g. useful |
| * if you are simulating BSC + MNCC, and first trigger a connection from BSC side in a |
| * component which then subsequently should also handle the MNCC emulation. |
| * |
| * Inbound Unit Data messages (such as are dispatched to the MnccOps.unitdata_cb() callback, |
| * which is registered with an argument to the main() function below. |
| * |
| * (C) 2018 by Harald Welte <laforge@gnumonks.org> |
| * All rights reserved. |
| * |
| * Released under the terms of GNU General Public License, Version 2 or |
| * (at your option) any later version. |
| */ |
| |
| |
| import from Osmocom_Types all; |
| import from MNCC_CodecPort all; |
| import from MNCC_Types all; |
| import from UD_Types all; |
| |
| /* General "base class" component definition, of which specific implementations |
| * derive themselves by means of the "extends" feature */ |
| type component MNCC_ConnHdlr { |
| /* ports towards MNCC Emulator core / call dispatchar */ |
| port MNCC_Conn_PT MNCC; |
| port MNCCEM_PROC_PT MNCC_PROC; |
| } |
| |
| /* Auxiliary primitive that can happen on the port between per-connection client and this dispatcher */ |
| type enumerated MNCC_Conn_Prim { |
| /* MNCC tell us that connection was released */ |
| MNCC_CONN_PRIM_DISC_IND, |
| /* we tell MNCC to release connection */ |
| MNCC_CONN_PRIM_DISC_REQ |
| } |
| |
| type record MNCC_Conn_Req { |
| MNCC_PDU mncc |
| } |
| |
| /* port between individual per-connection components and this dispatcher */ |
| type port MNCC_Conn_PT message { |
| inout MNCC_PDU, MNCC_Conn_Prim, MNCC_Conn_Req; |
| } with { extension "internal" }; |
| |
| |
| /* represents a single MNCC call */ |
| type record ConnectionData { |
| /* reference to the instance of the per-connection component */ |
| MNCC_ConnHdlr comp_ref, |
| integer mncc_call_id |
| } |
| |
| type component MNCC_Emulation_CT { |
| /* UNIX DOMAIN socket on the bottom side, using primitives */ |
| port MNCC_CODEC_PT MNCC; |
| /* MNCC port to the per-connection clients */ |
| port MNCC_Conn_PT MNCC_CLIENT; |
| |
| /* use 16 as this is also the number of SCCP connections that SCCP_Emulation can handle */ |
| var ConnectionData MnccCallTable[16]; |
| |
| /* pending expected incoming connections */ |
| var ExpectData MnccExpectTable[8]; |
| /* procedure based port to register for incoming connections */ |
| port MNCCEM_PROC_PT MNCC_PROC; |
| |
| var integer g_mncc_ud_id; |
| }; |
| |
| private function f_call_id_known(uint32_t mncc_call_id) |
| runs on MNCC_Emulation_CT return boolean { |
| var integer i; |
| for (i := 0; i < sizeof(MnccCallTable); i := i+1) { |
| if (MnccCallTable[i].mncc_call_id == mncc_call_id){ |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| private function f_comp_known(MNCC_ConnHdlr client) |
| runs on MNCC_Emulation_CT return boolean { |
| var integer i; |
| for (i := 0; i < sizeof(MnccCallTable); i := i+1) { |
| if (MnccCallTable[i].comp_ref == client) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /* resolve component reference by connection ID */ |
| private function f_comp_by_call_id(uint32_t mncc_call_id) |
| runs on MNCC_Emulation_CT return MNCC_ConnHdlr { |
| var integer i; |
| for (i := 0; i < sizeof(MnccCallTable); i := i+1) { |
| if (MnccCallTable[i].mncc_call_id == mncc_call_id) { |
| return MnccCallTable[i].comp_ref; |
| } |
| } |
| log("MNCC Call table not found by MNCC Call ID ", mncc_call_id); |
| setverdict(fail); |
| self.stop; |
| } |
| |
| /* resolve connection ID by component reference */ |
| private function f_call_id_by_comp(MNCC_ConnHdlr client) |
| runs on MNCC_Emulation_CT return integer { |
| for (var integer i := 0; i < sizeof(MnccCallTable); i := i+1) { |
| if (MnccCallTable[i].comp_ref == client) { |
| return MnccCallTable[i].mncc_call_id; |
| } |
| } |
| log("MNCC Call table not found by component ", client); |
| setverdict(fail); |
| self.stop; |
| } |
| |
| private function f_gen_call_id() |
| runs on MNCC_Emulation_CT return integer { |
| var uint32_t call_id; |
| |
| do { |
| call_id := float2int(rnd()*4294967296.0); |
| } while (f_call_id_known(call_id) == true); |
| |
| return call_id; |
| } |
| |
| private function f_expect_table_init() |
| runs on MNCC_Emulation_CT { |
| for (var integer i := 0; i < sizeof(MnccExpectTable); i := i+1) { |
| MnccExpectTable[i].dest_number := omit; |
| MnccExpectTable[i].vc_conn := null; |
| } |
| } |
| |
| private function f_call_table_init() |
| runs on MNCC_Emulation_CT { |
| for (var integer i := 0; i < sizeof(MnccCallTable); i := i+1) { |
| MnccCallTable[i].comp_ref := null; |
| MnccCallTable[i].mncc_call_id := -1; |
| } |
| } |
| |
| private function f_call_table_add(MNCC_ConnHdlr comp_ref, uint32_t mncc_call_id) |
| runs on MNCC_Emulation_CT { |
| for (var integer i := 0; i < sizeof(MnccCallTable); i := i+1) { |
| if (MnccCallTable[i].mncc_call_id == -1) { |
| MnccCallTable[i].comp_ref := comp_ref; |
| MnccCallTable[i].mncc_call_id := mncc_call_id; |
| log("Added conn table entry ", i, comp_ref, mncc_call_id); |
| return; |
| } |
| } |
| log("MNCC Call table full!"); |
| setverdict(fail); |
| self.stop; |
| } |
| |
| private function f_call_table_del(uint32_t mncc_call_id) |
| runs on MNCC_Emulation_CT { |
| for (var integer i := 0; i < sizeof(MnccCallTable); i := i+1) { |
| if (MnccCallTable[i].mncc_call_id == mncc_call_id) { |
| log("Deleted conn table entry ", i, |
| MnccCallTable[i].comp_ref, mncc_call_id); |
| MnccCallTable[i].mncc_call_id := -1; |
| MnccCallTable[i].comp_ref := null; |
| return |
| } |
| } |
| log("MNCC Call table attempt to delete non-existant ", mncc_call_id); |
| setverdict(fail); |
| self.stop; |
| } |
| |
| |
| private function f_connect(charstring sock) runs on MNCC_Emulation_CT { |
| var UD_connect_result res; |
| timer T := 5.0; |
| |
| T.start; |
| MNCC.send(UD_connect:{sock, -1}); |
| alt { |
| [] MNCC.receive(UD_connect_result:?) -> value res { |
| if (ispresent(res.result) and ispresent(res.result.result_code) and res.result.result_code == ERROR) { |
| setverdict(fail, "Error connecting to MNCC socket", res); |
| self.stop; |
| } else { |
| g_mncc_ud_id := res.id; |
| } |
| } |
| [] T.timeout { |
| setverdict(fail, "Timeout connecting to MNCC socket"); |
| self.stop; |
| } |
| } |
| } |
| |
| private function f_listen(charstring sock) runs on MNCC_Emulation_CT { |
| var UD_listen_result res; |
| var UD_connected udc; |
| timer T := 5.0; |
| |
| T.start; |
| MNCC.send(UD_listen:{sock}); |
| alt { |
| [] MNCC.receive(UD_listen_result:?) -> value res { |
| if (ispresent(res.result) and ispresent(res.result.result_code) and res.result.result_code == ERROR) { |
| setverdict(fail, "Error listening to MNCC socket", res); |
| self.stop; |
| } else { |
| g_mncc_ud_id := res.id; |
| } |
| } |
| [] T.timeout { |
| setverdict(fail, "Timeout listening to MNCC socket"); |
| self.stop; |
| } |
| } |
| |
| T.start; |
| alt { |
| [] MNCC.receive(UD_connected:?) -> value udc { |
| g_mncc_ud_id := res.id; |
| } |
| [] T.timeout { |
| setverdict(fail, "Timeout waiting for MNCC connection"); |
| self.stop; |
| } |
| } |
| } |
| |
| /* call-back type, to be provided by specific implementation; called when new SCCP connection |
| * arrives */ |
| type function MnccCreateCallback(MNCC_PDU conn_ind, charstring id) |
| runs on MNCC_Emulation_CT return MNCC_ConnHdlr; |
| |
| type function MnccUnitdataCallback(MNCC_PDU mncc) |
| runs on MNCC_Emulation_CT return template MNCC_PDU; |
| |
| type record MnccOps { |
| MnccCreateCallback create_cb, |
| MnccUnitdataCallback unitdata_cb |
| } |
| |
| function main(MnccOps ops, charstring id, charstring sock, boolean role_server := false) |
| runs on MNCC_Emulation_CT { |
| |
| if (role_server) { |
| f_listen(sock); |
| } else { |
| f_connect(sock); |
| } |
| f_expect_table_init(); |
| f_call_table_init(); |
| |
| while (true) { |
| var MNCC_send_data sd; |
| var MNCC_Conn_Req creq; |
| var MNCC_ConnHdlr vc_conn; |
| var MNCC_PDU mncc; |
| var MNCC_ConnHdlr vc_hdlr; |
| var charstring dest_nr; |
| |
| alt { |
| /* MNCC -> Client: UNIT-DATA (connectionless SCCP) from a BSC */ |
| [] MNCC.receive(t_SD_MNCC_MSGT(g_mncc_ud_id, MNCC_SOCKET_HELLO)) -> value sd { |
| /* Connectionless Procedures like HELLO */ |
| var template MNCC_PDU resp; |
| resp := ops.unitdata_cb.apply(sd.data); |
| if (isvalue(resp)) { |
| MNCC.send(t_SD_MNCC(g_mncc_ud_id, resp)); |
| } |
| } |
| |
| /* MNCC -> Client: Release Indication / confirmation */ |
| [] MNCC.receive(t_SD_MNCC_MSGT(g_mncc_ud_id, (MNCC_REL_IND, MNCC_REL_CNF))) -> value sd { |
| var uint32_t call_id := f_mncc_get_call_id(sd.data); |
| /* forward to respective client */ |
| vc_conn := f_comp_by_call_id(call_id); |
| MNCC_CLIENT.send(sd.data) to vc_conn; |
| /* remove from call table */ |
| f_call_table_del(call_id); |
| } |
| |
| /* MNCC -> Client: call related messages */ |
| [] MNCC.receive(t_SD_MNCC_MSGT(g_mncc_ud_id, ?)) -> value sd { |
| var uint32_t call_id := f_mncc_get_call_id(sd.data); |
| |
| if (f_call_id_known(call_id)) { |
| vc_conn := f_comp_by_call_id(call_id); |
| MNCC_CLIENT.send(sd.data) to vc_conn; |
| } else { |
| /* TODO: Only accept this for SETUP.req? */ |
| vc_conn := ops.create_cb.apply(sd.data, id) |
| /* store mapping between client components and SCCP connectionId */ |
| f_call_table_add(vc_conn, call_id); |
| /* handle user payload */ |
| MNCC_CLIENT.send(sd.data) to vc_conn; |
| } |
| } |
| |
| /* Client -> MNCC Socket: RELEASE.ind or RELEASE.cnf: forward + drop call table entry */ |
| [] MNCC_CLIENT.receive(MNCC_PDU:{msg_type := (MNCC_REL_IND, MNCC_REL_CNF), u:=?}) -> value mncc sender vc_conn { |
| var integer call_id := f_call_id_by_comp(vc_conn); |
| /* forward to MNCC socket */ |
| MNCC.send(t_SD_MNCC(g_mncc_ud_id, mncc)); |
| /* remove from call table */ |
| f_call_table_del(call_id); |
| } |
| |
| /* Client -> MNCC Socket: Normal message */ |
| [] MNCC_CLIENT.receive(MNCC_PDU:?) -> value mncc sender vc_conn { |
| if (mncc.msg_type == MNCC_SETUP_REQ and not role_server) { |
| /* ConnHdlr -> MNCC Server: SETUP.req: add to call table */ |
| f_call_table_add(vc_conn, f_mncc_get_call_id(mncc)); |
| } else if (mncc.msg_type == MNCC_SETUP_IND and role_server) { |
| /* ConnHdlr -> MNCC Client: SETUP.ind: add to call table */ |
| f_call_table_add(vc_conn, f_mncc_get_call_id(mncc)); |
| } |
| /* forward to MNCC socket */ |
| MNCC.send(t_SD_MNCC(g_mncc_ud_id, mncc)); |
| } |
| |
| [] MNCC_CLIENT.receive(MNCC_PDU:?) -> value mncc sender vc_conn { |
| /* forward to MNCC socket */ |
| MNCC.send(t_SD_MNCC(g_mncc_ud_id, mncc)); |
| } |
| |
| |
| /* Client -> us: procedure call to register expect */ |
| [] MNCC_PROC.getcall(MNCCEM_register:{?,?}) -> param(dest_nr, vc_hdlr) { |
| f_create_expect(dest_nr, vc_hdlr); |
| MNCC_PROC.reply(MNCCEM_register:{dest_nr, vc_hdlr}); |
| } |
| |
| } |
| } |
| } |
| |
| private function f_mgcp_ep_extract_cic(charstring inp) return integer { |
| var charstring local_part := regexp(inp, "(*)@*", 0); |
| return hex2int(str2hex(local_part)); |
| |
| } |
| |
| /*********************************************************************** |
| * "Expect" Handling (mapping for expected incoming MNCC calls from IUT) |
| ***********************************************************************/ |
| |
| /* data about an expected future incoming connection */ |
| type record ExpectData { |
| /* destination number based on which we can match it */ |
| charstring dest_number optional, |
| /* component reference for this connection */ |
| MNCC_ConnHdlr vc_conn |
| } |
| |
| /* procedure based port to register for incoming calls */ |
| signature MNCCEM_register(in charstring dest_nr, in MNCC_ConnHdlr hdlr); |
| |
| type port MNCCEM_PROC_PT procedure { |
| inout MNCCEM_register; |
| } with { extension "internal" }; |
| |
| /* CreateCallback that can be used as create_cb and will use the expectation table */ |
| function ExpectedCreateCallback(MNCC_PDU conn_ind, charstring id) |
| runs on MNCC_Emulation_CT return MNCC_ConnHdlr { |
| var MNCC_ConnHdlr ret := null; |
| var charstring dest_number; |
| var integer i; |
| |
| if (not ischosen(conn_ind.u.signal) or conn_ind.msg_type != MNCC_SETUP_IND) { |
| setverdict(fail, "MNCC ExpectedCreateCallback needs MNCC_SETUP_IND"); |
| return ret; |
| } |
| dest_number := conn_ind.u.signal.called.number; |
| |
| for (i := 0; i < sizeof(MnccExpectTable); i:= i+1) { |
| if (not ispresent(MnccExpectTable[i].dest_number)) { |
| continue; |
| } |
| if (dest_number == MnccExpectTable[i].dest_number) { |
| ret := MnccExpectTable[i].vc_conn; |
| /* release this entry to be used again */ |
| MnccExpectTable[i].dest_number := omit; |
| MnccExpectTable[i].vc_conn := null; |
| log("Found MnccExpect[", i, "] for ", dest_number, " handled at ", ret); |
| /* return the component reference */ |
| return ret; |
| } |
| } |
| setverdict(fail, "Couldn't find MnccExpect for incoming call ", dest_number); |
| return ret; |
| } |
| |
| /* server/emulation side function to create expect */ |
| private function f_create_expect(charstring dest_number, MNCC_ConnHdlr hdlr) |
| runs on MNCC_Emulation_CT { |
| var integer i; |
| for (i := 0; i < sizeof(MnccExpectTable); i := i+1) { |
| if (not ispresent(MnccExpectTable[i].dest_number)) { |
| MnccExpectTable[i].dest_number := dest_number; |
| MnccExpectTable[i].vc_conn := hdlr; |
| log("Created MnccExpect[", i, "] for ", dest_number, " to be handled at ", hdlr); |
| return; |
| } |
| } |
| setverdict(fail, "No space left in MnccMnccExpectTable"); |
| } |
| |
| /* client/conn_hdlr side function to use procedure port to create expect in emulation */ |
| function f_create_mncc_expect(charstring dest_number) runs on MNCC_ConnHdlr { |
| MNCC_PROC.call(MNCCEM_register:{dest_number, self}) { |
| [] MNCC_PROC.getreply(MNCCEM_register:{?,?}) {}; |
| } |
| } |
| |
| function DummyUnitdataCallback(MNCC_PDU mncc) |
| runs on MNCC_Emulation_CT return template MNCC_PDU { |
| log("Ignoring MNCC ", mncc); |
| return omit; |
| } |
| |
| } |