Pau Espin Pedrol | caf028d | 2024-04-18 13:47:07 +0200 | [diff] [blame] | 1 | /* Component implementing a SIP UA towards Asterisk |
| 2 | * (C) 2024 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de> |
| 3 | * Author: Pau Espin Pedrol <pespin@sysmocom.de> |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * Released under the terms of GNU General Public License, Version 2 or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 10 | */ |
| 11 | module SIP_ConnectionHandler { |
| 12 | |
| 13 | import from TCCOpenSecurity_Functions all; |
| 14 | import from General_Types all; |
| 15 | import from Osmocom_Types all; |
| 16 | import from Native_Functions all; |
| 17 | import from Misc_Helpers all; |
| 18 | |
| 19 | import from SDP_Types all; |
| 20 | import from SDP_Templates all; |
| 21 | |
| 22 | import from SIP_Emulation all; |
| 23 | import from SIPmsg_Types all; |
| 24 | import from SIP_Templates all; |
| 25 | |
| 26 | type port Coord_PT message |
| 27 | { |
| 28 | inout charstring; |
| 29 | } with { extension "internal" }; |
| 30 | |
| 31 | const charstring COORD_CMD_REGISTERED := "COORD_CMD_REGISTERED"; |
| 32 | const charstring COORD_CMD_START := "COORD_CMD_START"; |
| 33 | const charstring COORD_CMD_PICKUP := "COORD_CMD_PICKUP"; |
| 34 | const charstring COORD_CMD_CALL_ESTABLISHED := "COORD_CMD_CALL_ESTABLISHED"; |
| 35 | const charstring COORD_CMD_CALL_CANCELLED := "COORD_CMD_CALL_CANCELLED"; |
| 36 | const charstring COORD_CMD_HANGUP := "COORD_CMD_HANGUP"; |
| 37 | |
| 38 | type component SIPConnHdlr extends SIP_ConnHdlr { |
| 39 | var charstring g_name; |
| 40 | var SIPConnHdlrPars g_pars; |
| 41 | timer g_Tguard; |
| 42 | var PDU_SIP_Request g_rx_sip_req; |
| 43 | var PDU_SIP_Response g_rx_sip_resp; |
| 44 | |
| 45 | port Coord_PT COORD; |
| 46 | } |
| 47 | type record of SIPConnHdlr SIPConnHdlrList; |
| 48 | |
| 49 | type record SIPConnHdlrPars { |
| 50 | float t_guard, |
| 51 | charstring remote_sip_host, |
| 52 | uint16_t remote_sip_port, |
| 53 | charstring user, |
| 54 | charstring display_name, |
| 55 | charstring password, |
| 56 | SipUrl registrar_sip_req_uri, |
| 57 | SipAddr registrar_sip_record, |
| 58 | CallidString registrar_sip_call_id, |
| 59 | integer registrar_sip_seq_nr, |
| 60 | Via local_via, |
| 61 | SipUrl local_sip_url_ext, |
| 62 | SipAddr local_sip_record, |
| 63 | Contact local_contact, |
| 64 | CallPars cp optional |
| 65 | } |
| 66 | type record of SIPConnHdlrPars SIPConnHdlrParsList; |
| 67 | |
| 68 | type record CallParsMT { |
| 69 | /* Whether to wait for COORD.receive(COORD_CMD_PICKUP) before accepting the call. */ |
| 70 | boolean wait_coord_cmd_pickup, |
| 71 | /* Whether to expect CANCEL instead of ACK as answer to our OK */ |
| 72 | boolean exp_cancel |
| 73 | } |
| 74 | template (value) CallParsMT t_CallParsMT := { |
| 75 | wait_coord_cmd_pickup := false, |
| 76 | exp_cancel := false |
| 77 | } |
| 78 | |
| 79 | type record CallPars { |
| 80 | SipAddr calling optional, |
| 81 | SipAddr called optional, |
| 82 | |
Pau Espin Pedrol | 41b0e07 | 2024-05-29 18:25:51 +0200 | [diff] [blame] | 83 | From from_addr optional, |
| 84 | To to_addr optional, |
Pau Espin Pedrol | caf028d | 2024-04-18 13:47:07 +0200 | [diff] [blame] | 85 | |
| 86 | CallidString sip_call_id, |
| 87 | integer sip_seq_nr, |
| 88 | charstring sip_body optional, |
| 89 | |
| 90 | charstring local_rtp_addr, |
| 91 | uint16_t local_rtp_port, |
| 92 | |
| 93 | SDP_Message peer_sdp optional, |
| 94 | CallParsMT mt |
| 95 | } |
| 96 | |
| 97 | template (value) CallPars t_CallPars(charstring local_rtp_addr, |
| 98 | uint16_t local_rtp_port := 0, |
| 99 | template (omit) SipAddr calling := omit, |
| 100 | template (omit) SipAddr called := omit) := { |
| 101 | calling := calling, |
| 102 | called := called, |
| 103 | from_addr := omit, |
| 104 | to_addr := omit, |
| 105 | sip_call_id := hex2str(f_rnd_hexstring(15)), |
| 106 | sip_seq_nr := f_sip_rand_seq_nr(), |
| 107 | sip_body := omit, |
| 108 | local_rtp_addr := local_rtp_addr, |
| 109 | local_rtp_port := local_rtp_port, |
| 110 | peer_sdp := omit, |
| 111 | mt := t_CallParsMT |
| 112 | } |
| 113 | |
| 114 | template (value) SIPConnHdlrPars t_Pars(charstring local_sip_host, |
| 115 | uint16_t local_sip_port, |
| 116 | charstring remote_sip_host, |
| 117 | uint16_t remote_sip_port, |
| 118 | charstring user, |
| 119 | charstring display_name := "Anonymous", |
| 120 | charstring password := "secret", |
| 121 | template (omit) CallPars cp := omit) := { |
| 122 | t_guard := 30.0, |
| 123 | remote_sip_host := remote_sip_host, |
| 124 | remote_sip_port := remote_sip_port, |
| 125 | user := user, |
| 126 | display_name := f_sip_str_quote(display_name), |
| 127 | password := password, |
| 128 | registrar_sip_req_uri := valueof(ts_SipUrlHost(remote_sip_host)), |
| 129 | registrar_sip_record := ts_SipAddr(ts_HostPort(remote_sip_host), |
| 130 | ts_UserInfo(user), |
| 131 | f_sip_str_quote(display_name)), |
| 132 | registrar_sip_call_id := hex2str(f_rnd_hexstring(15)) & "@" & local_sip_host, |
| 133 | registrar_sip_seq_nr := f_sip_rand_seq_nr(), |
| 134 | local_via := ts_Via_from(ts_HostPort(local_sip_host, local_sip_port)), |
| 135 | local_sip_url_ext := ts_SipUrl(ts_HostPort(local_sip_host, local_sip_port), |
| 136 | ts_UserInfo(user)), |
| 137 | local_sip_record := ts_SipAddr(ts_HostPort(local_sip_host), |
| 138 | ts_UserInfo(user)), |
| 139 | local_contact := valueof(ts_Contact({ |
| 140 | ts_ContactAddress( |
| 141 | ts_Addr_Union_SipUrl(ts_SipUrl(ts_HostPort( |
| 142 | local_sip_host, |
| 143 | local_sip_port), |
| 144 | ts_UserInfo(user))), |
| 145 | omit) |
| 146 | })), |
| 147 | cp := cp |
| 148 | } |
| 149 | |
| 150 | private altstep as_Tguard() runs on SIPConnHdlr { |
| 151 | [] g_Tguard.timeout { |
| 152 | setverdict(fail, "Tguard timeout"); |
| 153 | mtc.stop; |
| 154 | } |
| 155 | } |
| 156 | |
| 157 | type function void_fn(charstring id) runs on SIPConnHdlr; |
| 158 | function f_handler_init(void_fn fn, charstring id, SIPConnHdlrPars pars) |
| 159 | runs on SIPConnHdlr { |
| 160 | g_name := id; |
| 161 | g_pars := pars; |
| 162 | g_Tguard.start(pars.t_guard); |
| 163 | activate(as_Tguard()); |
| 164 | |
| 165 | // Make sure the UA is deregistered before starting the test: |
| 166 | // sends REGISTER with Contact = "*" and Expires = 0 |
| 167 | //f_SIP_deregister(); |
| 168 | |
| 169 | /* call the user-supied test case function */ |
| 170 | fn.apply(id); |
| 171 | } |
| 172 | |
| 173 | private function f_tr_Via_response(Via via_req) return template (present) Via { |
| 174 | template (present) SemicolonParam_List via_resp_params := ?; |
| 175 | |
| 176 | /*via_resp_params := { |
| 177 | { id := "rport", paramValue := int2str(g_pars.remote_sip_port) }, |
| 178 | { id := "received", paramValue := g_pars.remote_sip_host } |
| 179 | }; */ |
| 180 | return tr_Via_from(via_req.viaBody[0].sentBy, |
Pau Espin Pedrol | 2a83337 | 2024-05-10 20:23:22 +0200 | [diff] [blame] | 181 | via_req.viaBody[0].sentProtocol.transport, |
Pau Espin Pedrol | caf028d | 2024-04-18 13:47:07 +0200 | [diff] [blame] | 182 | via_resp_params); |
| 183 | } |
| 184 | |
| 185 | private function f_tr_To_response(template (value) SipAddr to_req) return template (present) SipAddr { |
| 186 | return tr_SipAddr_from_val(to_req); |
| 187 | } |
| 188 | |
| 189 | private function f_tr_From(template (value) SipAddr from_req) return template (present) SipAddr { |
| 190 | return tr_SipAddr_from_val(from_req); |
| 191 | } |
| 192 | |
| 193 | private altstep as_SIP_fail_req(charstring exp_msg_str := "") runs on SIPConnHdlr |
| 194 | { |
| 195 | var PDU_SIP_Request sip_req; |
| 196 | [] SIP.receive(PDU_SIP_Request:?) -> value sip_req { |
| 197 | Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, |
| 198 | log2str(g_name & ": Received unexpected SIP Req message := ", sip_req, "\nvs exp := ", exp_msg_str)); |
| 199 | } |
| 200 | } |
| 201 | |
| 202 | private altstep as_SIP_fail_resp(charstring exp_msg_str := "") runs on SIPConnHdlr |
| 203 | { |
| 204 | var PDU_SIP_Response sip_resp; |
| 205 | [] SIP.receive(PDU_SIP_Response:?) -> value sip_resp { |
| 206 | Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, |
| 207 | log2str(g_name & ": Received unexpected SIP Resp message := ", sip_resp, "\nvs exp := ", exp_msg_str)); |
| 208 | } |
| 209 | } |
| 210 | |
| 211 | altstep as_SIP_expect_req(template (present) PDU_SIP_Request sip_expect, boolean fail_others := true) runs on SIPConnHdlr |
| 212 | { |
| 213 | var charstring sip_expect_str := log2str(sip_expect); |
| 214 | [] SIP.receive(sip_expect) -> value g_rx_sip_req; |
| 215 | [fail_others] as_SIP_fail_req(sip_expect_str); |
| 216 | [fail_others] as_SIP_fail_resp(sip_expect_str); |
| 217 | } |
| 218 | |
| 219 | altstep as_SIP_expect_resp(template (present) PDU_SIP_Response sip_expect, boolean fail_others := true) runs on SIPConnHdlr |
| 220 | { |
| 221 | var charstring sip_expect_str := log2str(sip_expect); |
| 222 | [] SIP.receive(sip_expect) -> value g_rx_sip_resp; |
| 223 | [fail_others] as_SIP_fail_resp(sip_expect_str); |
| 224 | [fail_others] as_SIP_fail_req(sip_expect_str); |
| 225 | } |
| 226 | |
| 227 | altstep as_SIP_ignore_resp(template PDU_SIP_Response sip_expect := ?) runs on SIPConnHdlr |
| 228 | { |
| 229 | [] SIP.receive(sip_expect) -> value g_rx_sip_resp { |
| 230 | log("Ignoring ", g_rx_sip_resp); |
| 231 | repeat; |
| 232 | } |
| 233 | } |
| 234 | |
| 235 | private function f_gen_sdp() runs on SIPConnHdlr return charstring { |
| 236 | var charstring sdp := |
| 237 | "v=0\r\n" & |
| 238 | "o=0502 2390 1824 IN IP4 " & g_pars.cp.local_rtp_addr & "\r\n" & |
| 239 | "s=Talk\r\n" & |
| 240 | "c=IN IP4 " & g_pars.cp.local_rtp_addr & "\r\n" & |
| 241 | "t=0 0\r\n" & |
| 242 | "a=rtcp-xr:rcvr-rtt=all:10000 stat-summary=loss,dup,jitt,TTL voip-metrics\r\n" & |
| 243 | "a=record:off\r\n" & |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 244 | "m=audio " & int2str(g_pars.cp.local_rtp_port) & " RTP/AVP 8 96 97 98 0 18 99 100 101\r\n" & |
| 245 | "a=rtpmap:8 PCMA/8000\r\n" & |
Pau Espin Pedrol | caf028d | 2024-04-18 13:47:07 +0200 | [diff] [blame] | 246 | "a=rtpmap:96 opus/48000/2\r\n" & |
| 247 | "a=fmtp:96 useinbandfec=1\r\n" & |
| 248 | "a=rtpmap:97 speex/16000\r\n" & |
| 249 | "a=fmtp:97 vbr=on\r\n" & |
| 250 | "a=rtpmap:98 speex/8000\r\n" & |
| 251 | "a=fmtp:98 vbr=on\r\n" & |
| 252 | "a=fmtp:18 annexb=yes\r\n" & |
| 253 | "a=rtpmap:99 telephone-event/48000\r\n" & |
| 254 | "a=rtpmap:100 telephone-event/16000\r\n" & |
| 255 | "a=rtpmap:101 telephone-event/8000\r\n" & |
| 256 | "a=rtcp:" & int2str(g_pars.cp.local_rtp_port + 1) & "\r\n" & |
| 257 | "a=rtcp-fb:* trr-int 1000\r\n" & |
| 258 | "a=rtcp-fb:* ccm tmmbr\r\n"; |
| 259 | return sdp; |
| 260 | } |
| 261 | |
| 262 | function f_SIP_register() runs on SIPConnHdlr return PDU_SIP_Response |
| 263 | { |
| 264 | var template (present) PDU_SIP_Response exp; |
| 265 | var Authorization authorization; |
| 266 | var Via via := g_pars.local_via; |
Pau Espin Pedrol | 41b0e07 | 2024-05-29 18:25:51 +0200 | [diff] [blame] | 267 | var From from_addr := valueof(ts_From(g_pars.registrar_sip_record.addr, g_pars.registrar_sip_record.params)); |
| 268 | var To to_addr := valueof(ts_To(g_pars.registrar_sip_record.addr, g_pars.registrar_sip_record.params)); |
| 269 | var template (present) To to_addr_exp := tr_To(tr_Addr_Union_from_val(to_addr.addressField), *); |
Pau Espin Pedrol | caf028d | 2024-04-18 13:47:07 +0200 | [diff] [blame] | 270 | var charstring branch_value; |
| 271 | |
| 272 | branch_value := f_sip_gen_branch(f_sip_SipAddr_to_str(g_pars.registrar_sip_record), |
| 273 | f_sip_SipAddr_to_str(g_pars.registrar_sip_record), |
| 274 | g_pars.registrar_sip_call_id, |
| 275 | g_pars.registrar_sip_seq_nr); |
| 276 | |
| 277 | via.viaBody[0].viaParams := f_sip_param_set(via.viaBody[0].viaParams, "branch", branch_value); |
Pau Espin Pedrol | 41b0e07 | 2024-05-29 18:25:51 +0200 | [diff] [blame] | 278 | from_addr.fromParams := f_sip_param_set(from_addr.fromParams, "tag", f_sip_rand_tag()); |
Pau Espin Pedrol | caf028d | 2024-04-18 13:47:07 +0200 | [diff] [blame] | 279 | SIP.send(ts_SIP_REGISTER(g_pars.registrar_sip_req_uri, |
| 280 | g_pars.registrar_sip_call_id, |
Pau Espin Pedrol | 41b0e07 | 2024-05-29 18:25:51 +0200 | [diff] [blame] | 281 | from_addr, |
| 282 | to_addr, |
Pau Espin Pedrol | caf028d | 2024-04-18 13:47:07 +0200 | [diff] [blame] | 283 | via, |
| 284 | g_pars.registrar_sip_seq_nr, |
| 285 | g_pars.local_contact, |
| 286 | ts_Expires("7200"))); |
| 287 | |
| 288 | exp := tr_SIP_Response_Unauthorized( |
| 289 | g_pars.registrar_sip_call_id, |
Pau Espin Pedrol | 41b0e07 | 2024-05-29 18:25:51 +0200 | [diff] [blame] | 290 | from_addr, |
| 291 | to_addr_exp, |
Pau Espin Pedrol | caf028d | 2024-04-18 13:47:07 +0200 | [diff] [blame] | 292 | f_tr_Via_response(via), |
| 293 | *, |
| 294 | tr_WwwAuthenticate({tr_Challenge_digestCln(?)}), |
| 295 | g_pars.registrar_sip_seq_nr); |
| 296 | as_SIP_expect_resp(exp); |
| 297 | |
| 298 | /* Digest Auth: RFC 2617 */ |
Pau Espin Pedrol | 80b981a | 2024-06-04 18:37:22 +0200 | [diff] [blame^] | 299 | authorization := f_sip_digest_gen_Authorization_MD5(g_rx_sip_resp.msgHeader.wwwAuthenticate, |
| 300 | g_pars.user, g_pars.password, |
| 301 | "REGISTER", |
| 302 | f_sip_SipUrl_to_str(g_pars.registrar_sip_req_uri)) |
Pau Espin Pedrol | caf028d | 2024-04-18 13:47:07 +0200 | [diff] [blame] | 303 | |
| 304 | /* New transaction: */ |
| 305 | g_pars.registrar_sip_seq_nr := g_pars.registrar_sip_seq_nr + 1; |
| 306 | branch_value := f_sip_gen_branch(f_sip_SipAddr_to_str(g_pars.registrar_sip_record), |
| 307 | f_sip_SipAddr_to_str(g_pars.registrar_sip_record), |
| 308 | g_pars.registrar_sip_call_id, |
| 309 | g_pars.registrar_sip_seq_nr); |
| 310 | via.viaBody[0].viaParams := f_sip_param_set(via.viaBody[0].viaParams, "branch", branch_value); |
| 311 | |
| 312 | SIP.send(ts_SIP_REGISTER(g_pars.registrar_sip_req_uri, |
| 313 | g_pars.registrar_sip_call_id, |
Pau Espin Pedrol | 41b0e07 | 2024-05-29 18:25:51 +0200 | [diff] [blame] | 314 | from_addr, |
| 315 | to_addr, |
Pau Espin Pedrol | caf028d | 2024-04-18 13:47:07 +0200 | [diff] [blame] | 316 | via, |
| 317 | g_pars.registrar_sip_seq_nr, |
| 318 | g_pars.local_contact, |
| 319 | ts_Expires("7200"), |
| 320 | authorization := authorization)); |
| 321 | |
| 322 | /* Wait for OK answer */ |
| 323 | exp := tr_SIP_Response( |
| 324 | g_pars.registrar_sip_call_id, |
Pau Espin Pedrol | 41b0e07 | 2024-05-29 18:25:51 +0200 | [diff] [blame] | 325 | from_addr, |
| 326 | to_addr_exp, |
Pau Espin Pedrol | caf028d | 2024-04-18 13:47:07 +0200 | [diff] [blame] | 327 | f_tr_Via_response(via), |
| 328 | *, |
| 329 | "REGISTER", 200, |
| 330 | g_pars.registrar_sip_seq_nr, "OK"); |
| 331 | as_SIP_expect_resp(exp); |
| 332 | |
| 333 | /* Prepare for next use: */ |
| 334 | g_pars.registrar_sip_seq_nr := g_pars.registrar_sip_seq_nr + 1; |
| 335 | return g_rx_sip_resp; |
| 336 | } |
| 337 | |
| 338 | function f_SIP_mo_call_setup() runs on SIPConnHdlr |
| 339 | { |
| 340 | var template (value) PDU_SIP_Request req; |
| 341 | var template (present) PDU_SIP_Response exp; |
Pau Espin Pedrol | 41b0e07 | 2024-05-29 18:25:51 +0200 | [diff] [blame] | 342 | var template (present) From from_addr_exp; |
| 343 | var template (present) To to_addr_exp; |
Pau Espin Pedrol | caf028d | 2024-04-18 13:47:07 +0200 | [diff] [blame] | 344 | var Via via; |
| 345 | var charstring tx_sdp := f_gen_sdp(); |
| 346 | var default d_trying, d_ringing; |
| 347 | var charstring branch_value; |
| 348 | |
| 349 | /* RFC 3261 8.1.1.3 From */ |
Pau Espin Pedrol | 41b0e07 | 2024-05-29 18:25:51 +0200 | [diff] [blame] | 350 | g_pars.cp.from_addr := valueof(ts_From(g_pars.cp.calling.addr, g_pars.cp.calling.params)); |
| 351 | g_pars.cp.from_addr.fromParams := f_sip_param_set(g_pars.cp.from_addr.fromParams, "tag", f_sip_rand_tag()); |
| 352 | g_pars.cp.to_addr := valueof(ts_To(g_pars.cp.called.addr, g_pars.cp.called.params)); |
| 353 | from_addr_exp := tr_From(tr_Addr_Union_from_val(g_pars.cp.from_addr.addressField), *); |
| 354 | to_addr_exp := tr_To(tr_Addr_Union_from_val(g_pars.cp.to_addr.addressField), *); |
| 355 | branch_value := f_sip_gen_branch(f_sip_Addr_Union_to_str(g_pars.cp.from_addr.addressField), |
| 356 | f_sip_Addr_Union_to_str(valueof(g_pars.cp.to_addr.addressField)), |
Pau Espin Pedrol | caf028d | 2024-04-18 13:47:07 +0200 | [diff] [blame] | 357 | g_pars.cp.sip_call_id, |
| 358 | g_pars.cp.sip_seq_nr); |
| 359 | via := g_pars.local_via; |
| 360 | via.viaBody[0].viaParams := f_sip_param_set(via.viaBody[0].viaParams, "branch", branch_value); |
| 361 | |
| 362 | req := ts_SIP_INVITE(g_pars.cp.sip_call_id, |
| 363 | g_pars.cp.from_addr, |
| 364 | g_pars.cp.to_addr, |
| 365 | via, |
| 366 | g_pars.local_contact, |
| 367 | g_pars.cp.sip_seq_nr, |
| 368 | body := tx_sdp); |
| 369 | |
| 370 | SIP.send(req); |
| 371 | |
| 372 | /* RFC 3261 22.2: */ |
| 373 | exp := tr_SIP_Response_Unauthorized( |
| 374 | g_pars.cp.sip_call_id, |
Pau Espin Pedrol | 41b0e07 | 2024-05-29 18:25:51 +0200 | [diff] [blame] | 375 | from_addr_exp, |
| 376 | to_addr_exp, |
Pau Espin Pedrol | caf028d | 2024-04-18 13:47:07 +0200 | [diff] [blame] | 377 | f_tr_Via_response(via), |
| 378 | *, |
| 379 | tr_WwwAuthenticate({tr_Challenge_digestCln(?)}), |
| 380 | g_pars.cp.sip_seq_nr, "INVITE"); |
| 381 | as_SIP_expect_resp(exp); |
| 382 | |
| 383 | /* Digest Auth: RFC 2617 */ |
Pau Espin Pedrol | 80b981a | 2024-06-04 18:37:22 +0200 | [diff] [blame^] | 384 | req.msgHeader.authorization := f_sip_digest_gen_Authorization_MD5( |
Pau Espin Pedrol | caf028d | 2024-04-18 13:47:07 +0200 | [diff] [blame] | 385 | g_rx_sip_resp.msgHeader.wwwAuthenticate, |
| 386 | g_pars.user, g_pars.password, |
| 387 | "INVITE", |
| 388 | f_sip_SipUrl_to_str(g_pars.registrar_sip_req_uri)) |
| 389 | g_pars.cp.sip_seq_nr := g_pars.cp.sip_seq_nr + 1; |
| 390 | f_sip_Request_inc_seq_nr(req); |
| 391 | SIP.send(req); |
| 392 | |
| 393 | /* Conditionally match and accept 100 Trying. */ |
| 394 | exp := tr_SIP_Response_Trying(g_pars.cp.sip_call_id, |
Pau Espin Pedrol | 41b0e07 | 2024-05-29 18:25:51 +0200 | [diff] [blame] | 395 | from_addr_exp, |
| 396 | to_addr_exp, |
Pau Espin Pedrol | caf028d | 2024-04-18 13:47:07 +0200 | [diff] [blame] | 397 | f_tr_Via_response(via), |
| 398 | g_pars.cp.sip_seq_nr, "INVITE"); |
| 399 | d_trying := activate(as_SIP_ignore_resp(exp)); |
| 400 | |
| 401 | /* Conditionally match and accept 180 Ringing */ |
| 402 | exp := tr_SIP_Response_Ringing(g_pars.cp.sip_call_id, |
Pau Espin Pedrol | 41b0e07 | 2024-05-29 18:25:51 +0200 | [diff] [blame] | 403 | from_addr_exp, |
| 404 | to_addr_exp, |
Pau Espin Pedrol | caf028d | 2024-04-18 13:47:07 +0200 | [diff] [blame] | 405 | f_tr_Via_response(via), |
| 406 | g_pars.cp.sip_seq_nr, "INVITE"); |
| 407 | d_ringing := activate(as_SIP_ignore_resp(exp)); |
| 408 | |
| 409 | /* Wait for OK answer */ |
| 410 | exp := tr_SIP_Response( |
| 411 | g_pars.cp.sip_call_id, |
Pau Espin Pedrol | 41b0e07 | 2024-05-29 18:25:51 +0200 | [diff] [blame] | 412 | from_addr_exp, |
| 413 | to_addr_exp, |
Pau Espin Pedrol | caf028d | 2024-04-18 13:47:07 +0200 | [diff] [blame] | 414 | f_tr_Via_response(via), |
| 415 | *, |
| 416 | "INVITE", 200, |
| 417 | g_pars.cp.sip_seq_nr, "OK", |
| 418 | body := ?); |
| 419 | as_SIP_expect_resp(exp, fail_others := false); |
| 420 | |
| 421 | deactivate(d_trying); |
| 422 | deactivate(d_ringing); |
| 423 | |
| 424 | /* Update To with the tags received from peer: */ |
Pau Espin Pedrol | 41b0e07 | 2024-05-29 18:25:51 +0200 | [diff] [blame] | 425 | g_pars.cp.to_addr := g_rx_sip_resp.msgHeader.toField; |
Pau Espin Pedrol | caf028d | 2024-04-18 13:47:07 +0200 | [diff] [blame] | 426 | |
| 427 | /* Transmit ACK */ |
| 428 | g_pars.cp.sip_seq_nr := g_pars.cp.sip_seq_nr + 1; |
| 429 | req := ts_SIP_ACK(g_pars.cp.sip_call_id, |
| 430 | g_pars.cp.from_addr, |
| 431 | g_pars.cp.to_addr, |
| 432 | via, |
| 433 | g_pars.cp.sip_seq_nr, |
| 434 | omit); |
| 435 | SIP.send(req); |
| 436 | g_pars.cp.sip_seq_nr := g_pars.cp.sip_seq_nr + 1; |
| 437 | } |
| 438 | |
| 439 | private function f_ConnHdlr_parse_initial_SIP_INVITE(PDU_SIP_Request rx_sip_req) runs on SIPConnHdlr |
| 440 | { |
| 441 | f_SDP_decodeMessage(rx_sip_req.messageBody, g_pars.cp.peer_sdp); |
| 442 | log("Rx Initial MT INVITE decoded SDP: ", g_pars.cp.peer_sdp); |
| 443 | |
| 444 | /* Obtain params: */ |
| 445 | g_pars.cp.sip_call_id := rx_sip_req.msgHeader.callId.callid; |
Pau Espin Pedrol | 41b0e07 | 2024-05-29 18:25:51 +0200 | [diff] [blame] | 446 | g_pars.cp.from_addr := rx_sip_req.msgHeader.fromField; |
| 447 | g_pars.cp.to_addr := rx_sip_req.msgHeader.toField; |
| 448 | g_pars.cp.to_addr.toParams := f_sip_param_set(g_pars.cp.to_addr.toParams, "tag", f_sip_rand_tag()); |
Pau Espin Pedrol | caf028d | 2024-04-18 13:47:07 +0200 | [diff] [blame] | 449 | g_pars.cp.sip_seq_nr := rx_sip_req.msgHeader.cSeq.seqNumber; |
| 450 | } |
| 451 | |
| 452 | /* Peer is calling us, accept it: */ |
| 453 | altstep as_SIP_mt_call_accept(boolean exp_update_to_direct_rtp := true, |
| 454 | boolean fail_others := true) runs on SIPConnHdlr |
| 455 | { |
| 456 | var template (present) PDU_SIP_Request exp_req := |
| 457 | tr_SIP_INVITE(f_tr_SipUrl_opt_defport(g_pars.local_sip_url_ext), |
| 458 | ?, |
Pau Espin Pedrol | 41b0e07 | 2024-05-29 18:25:51 +0200 | [diff] [blame] | 459 | tr_From(tr_Addr_Union_from_val(g_pars.cp.calling.addr), *), |
| 460 | tr_To(tr_Addr_Union_from_val(g_pars.cp.called.addr), *), |
Pau Espin Pedrol | caf028d | 2024-04-18 13:47:07 +0200 | [diff] [blame] | 461 | tr_Via_from(f_tr_HostPort(g_pars.remote_sip_host, g_pars.remote_sip_port)), |
| 462 | ?, ?); |
| 463 | var charstring sip_expect_str := log2str(exp_req); |
| 464 | |
| 465 | [] SIP.receive(exp_req) -> value g_rx_sip_req { |
| 466 | var template (value) PDU_SIP_Response tx_resp; |
| 467 | var Via via; |
| 468 | var charstring tx_sdp; |
| 469 | |
| 470 | /* Obtain params: */ |
| 471 | f_ConnHdlr_parse_initial_SIP_INVITE(g_rx_sip_req); |
| 472 | via := g_rx_sip_req.msgHeader.via; |
| 473 | |
| 474 | |
| 475 | /* Tx 180 Ringing */ |
| 476 | tx_resp := ts_SIP_Response_Ringing(g_pars.cp.sip_call_id, |
| 477 | g_pars.cp.from_addr, |
| 478 | g_pars.cp.to_addr, |
| 479 | via, |
| 480 | g_pars.cp.sip_seq_nr); |
| 481 | SIP.send(tx_resp); |
| 482 | |
| 483 | if (g_pars.cp.mt.wait_coord_cmd_pickup) { |
| 484 | COORD.receive(COORD_CMD_PICKUP); |
| 485 | } |
| 486 | |
| 487 | /* Tx 200 OK */ |
| 488 | tx_sdp := f_gen_sdp(); |
| 489 | tx_resp := ts_SIP_Response(g_pars.cp.sip_call_id, |
| 490 | g_pars.cp.from_addr, |
| 491 | g_pars.cp.to_addr, |
| 492 | "INVITE", 200, |
| 493 | g_pars.cp.sip_seq_nr, |
| 494 | "OK", |
| 495 | via, |
| 496 | body := tx_sdp); |
| 497 | SIP.send(tx_resp); |
| 498 | |
| 499 | /* Wait for ACK */ |
| 500 | exp_req := tr_SIP_ACK(f_tr_SipUrl_opt_defport(g_pars.local_sip_url_ext), |
| 501 | g_pars.cp.sip_call_id, |
| 502 | g_pars.cp.from_addr, |
| 503 | g_pars.cp.to_addr, |
| 504 | f_tr_Via_response(via), |
| 505 | g_pars.cp.sip_seq_nr, *); |
| 506 | as_SIP_expect_req(exp_req); |
| 507 | |
| 508 | if (exp_update_to_direct_rtp) { |
| 509 | /* Asterisk will now update the session to connect us to MO directly: */ |
| 510 | /* Via is not kept since anyway "branch" will change upon following INVITE. */ |
| 511 | as_SIP_exp_call_update(g_pars.cp.sip_seq_nr + 1); |
| 512 | } |
| 513 | } |
| 514 | [fail_others] as_SIP_fail_resp(sip_expect_str); |
| 515 | [fail_others] as_SIP_fail_req(sip_expect_str); |
| 516 | |
| 517 | } |
| 518 | |
| 519 | /* Peer is calling us, but cancells it during ringing: */ |
| 520 | altstep as_SIP_mt_call_cancelled(boolean fail_others := true) runs on SIPConnHdlr |
| 521 | { |
| 522 | var template (present) PDU_SIP_Request exp_req := |
| 523 | tr_SIP_INVITE(f_tr_SipUrl_opt_defport(g_pars.local_sip_url_ext), |
| 524 | ?, |
Pau Espin Pedrol | 41b0e07 | 2024-05-29 18:25:51 +0200 | [diff] [blame] | 525 | tr_From(tr_Addr_Union_from_val(g_pars.cp.calling.addr), *), |
| 526 | tr_To(tr_Addr_Union_from_val(g_pars.cp.called.addr), *), |
Pau Espin Pedrol | caf028d | 2024-04-18 13:47:07 +0200 | [diff] [blame] | 527 | tr_Via_from(f_tr_HostPort(g_pars.remote_sip_host, g_pars.remote_sip_port)), |
| 528 | ?, ?); |
| 529 | var charstring sip_expect_str := log2str(exp_req); |
| 530 | |
| 531 | [] SIP.receive(exp_req) -> value g_rx_sip_req { |
| 532 | var template (value) PDU_SIP_Response tx_resp; |
| 533 | var Via via; |
Pau Espin Pedrol | 41b0e07 | 2024-05-29 18:25:51 +0200 | [diff] [blame] | 534 | var template (present) To exp_to_addr; |
Pau Espin Pedrol | caf028d | 2024-04-18 13:47:07 +0200 | [diff] [blame] | 535 | var charstring tx_sdp; |
| 536 | |
| 537 | /* Obtain params: */ |
| 538 | f_ConnHdlr_parse_initial_SIP_INVITE(g_rx_sip_req); |
| 539 | via := g_rx_sip_req.msgHeader.via; |
| 540 | |
| 541 | |
| 542 | /* Tx 180 Ringing */ |
| 543 | tx_resp := ts_SIP_Response_Ringing(g_pars.cp.sip_call_id, |
| 544 | g_pars.cp.from_addr, |
| 545 | g_pars.cp.to_addr, |
| 546 | via, |
| 547 | g_pars.cp.sip_seq_nr); |
| 548 | SIP.send(tx_resp); |
| 549 | |
| 550 | if (g_pars.cp.mt.wait_coord_cmd_pickup) { |
| 551 | COORD.receive(COORD_CMD_PICKUP); |
| 552 | } |
| 553 | |
| 554 | /* Wait for CANCEL */ |
| 555 | /* Cancel may come even before we send Ringing, hence To's "tag" |
| 556 | * may not be known by peer, so g_pars.to_addr can't be used here: */ |
Pau Espin Pedrol | 41b0e07 | 2024-05-29 18:25:51 +0200 | [diff] [blame] | 557 | exp_to_addr := g_rx_sip_req.msgHeader.toField; |
Pau Espin Pedrol | caf028d | 2024-04-18 13:47:07 +0200 | [diff] [blame] | 558 | exp_req := tr_SIP_CANCEL(f_tr_SipUrl_opt_defport(g_pars.local_sip_url_ext), |
| 559 | g_pars.cp.sip_call_id, |
| 560 | g_pars.cp.from_addr, |
| 561 | exp_to_addr, |
| 562 | f_tr_Via_response(via), |
| 563 | g_pars.cp.sip_seq_nr, *); |
| 564 | as_SIP_expect_req(exp_req); |
| 565 | |
| 566 | /* Tx 200 OK */ |
| 567 | tx_sdp := f_gen_sdp(); |
| 568 | tx_resp := ts_SIP_Response(g_pars.cp.sip_call_id, |
| 569 | g_pars.cp.from_addr, |
| 570 | g_pars.cp.to_addr, |
| 571 | "CANCEL", 200, |
| 572 | g_pars.cp.sip_seq_nr, |
| 573 | "OK", |
| 574 | via, |
| 575 | body := omit); |
| 576 | SIP.send(tx_resp); |
| 577 | } |
| 578 | [fail_others] as_SIP_fail_resp(sip_expect_str); |
| 579 | [fail_others] as_SIP_fail_req(sip_expect_str); |
| 580 | |
| 581 | } |
| 582 | |
| 583 | /* New INVITE arrives after MT call is established. Accept it: */ |
| 584 | altstep as_SIP_exp_call_update(template (present) integer exp_seq_nr := ?, boolean fail_others := true) runs on SIPConnHdlr |
| 585 | { |
| 586 | var template (present) PDU_SIP_Request exp_req := |
| 587 | tr_SIP_INVITE(f_tr_SipUrl_opt_defport(g_pars.local_sip_url_ext), |
| 588 | g_pars.cp.sip_call_id, |
| 589 | g_pars.cp.from_addr, |
| 590 | g_pars.cp.to_addr, |
| 591 | tr_Via_from(f_tr_HostPort(g_pars.remote_sip_host, g_pars.remote_sip_port)), |
| 592 | exp_seq_nr, |
| 593 | ?); |
| 594 | var charstring sip_expect_str := log2str(exp_req); |
| 595 | |
| 596 | [] SIP.receive(exp_req) -> value g_rx_sip_req { |
| 597 | var template (value) PDU_SIP_Response tx_resp; |
| 598 | var charstring tx_sdp; |
| 599 | var Via via; |
| 600 | |
| 601 | f_SDP_decodeMessage(g_rx_sip_req.messageBody, g_pars.cp.peer_sdp); |
| 602 | log("Rx Update MT INVITE decoded SDP: ", g_pars.cp.peer_sdp); |
| 603 | |
| 604 | /* Update parameters: */ |
| 605 | g_pars.cp.sip_seq_nr := g_rx_sip_req.msgHeader.cSeq.seqNumber; |
| 606 | /* "branch" has changed: */ |
| 607 | via := g_rx_sip_req.msgHeader.via; |
| 608 | |
| 609 | /* Tx 200 OK */ |
| 610 | tx_sdp := f_gen_sdp(); |
| 611 | tx_resp := ts_SIP_Response(g_pars.cp.sip_call_id, |
| 612 | g_pars.cp.from_addr, |
| 613 | g_pars.cp.to_addr, |
| 614 | "INVITE", 200, |
| 615 | g_pars.cp.sip_seq_nr, |
| 616 | "OK", |
| 617 | via, |
| 618 | body := tx_sdp); |
| 619 | SIP.send(tx_resp); |
| 620 | |
| 621 | /* Wait for ACK */ |
| 622 | exp_req := tr_SIP_ACK(f_tr_SipUrl_opt_defport(g_pars.local_sip_url_ext), |
| 623 | g_pars.cp.sip_call_id, |
| 624 | g_pars.cp.from_addr, |
| 625 | g_pars.cp.to_addr, |
| 626 | f_tr_Via_response(via), |
| 627 | g_pars.cp.sip_seq_nr, *); |
| 628 | as_SIP_expect_req(exp_req); |
| 629 | } |
| 630 | [fail_others] as_SIP_fail_resp(sip_expect_str); |
| 631 | [fail_others] as_SIP_fail_req(sip_expect_str); |
| 632 | } |
| 633 | |
| 634 | /* Tx BYE: */ |
| 635 | function f_SIP_do_call_hangup() runs on SIPConnHdlr |
| 636 | { |
| 637 | var template (value) PDU_SIP_Request req; |
| 638 | var template (present) PDU_SIP_Response exp_resp; |
| 639 | var Via via; |
| 640 | var charstring branch_value; |
| 641 | |
Pau Espin Pedrol | 41b0e07 | 2024-05-29 18:25:51 +0200 | [diff] [blame] | 642 | branch_value := f_sip_gen_branch(f_sip_Addr_Union_to_str(g_pars.cp.from_addr.addressField), |
| 643 | f_sip_Addr_Union_to_str(valueof(g_pars.cp.to_addr.addressField)), |
Pau Espin Pedrol | caf028d | 2024-04-18 13:47:07 +0200 | [diff] [blame] | 644 | g_pars.cp.sip_call_id, |
| 645 | g_pars.cp.sip_seq_nr); |
| 646 | |
| 647 | via := g_pars.local_via; |
| 648 | via.viaBody[0].viaParams := f_sip_param_set(via.viaBody[0].viaParams, "branch", branch_value); |
| 649 | |
| 650 | /* Transmit ACK */ |
| 651 | req := ts_SIP_BYE(g_pars.cp.sip_call_id, |
| 652 | g_pars.cp.from_addr, |
| 653 | g_pars.cp.to_addr, |
| 654 | via, |
| 655 | g_pars.cp.sip_seq_nr, |
| 656 | omit); |
| 657 | SIP.send(req); |
| 658 | |
| 659 | /* Wait for OK answer */ |
| 660 | exp_resp := tr_SIP_Response( |
| 661 | g_pars.cp.sip_call_id, |
| 662 | g_pars.cp.from_addr, |
Pau Espin Pedrol | 41b0e07 | 2024-05-29 18:25:51 +0200 | [diff] [blame] | 663 | tr_To(tr_Addr_Union_from_val(g_pars.cp.to_addr.addressField), *), |
Pau Espin Pedrol | caf028d | 2024-04-18 13:47:07 +0200 | [diff] [blame] | 664 | f_tr_Via_response(via), |
| 665 | *, |
| 666 | "BYE", 200, |
| 667 | g_pars.cp.sip_seq_nr, "OK"); |
| 668 | as_SIP_expect_resp(exp_resp); |
| 669 | |
| 670 | g_pars.cp.sip_seq_nr := g_pars.cp.sip_seq_nr + 1; |
| 671 | } |
| 672 | |
| 673 | /* Call is terminated by peer: */ |
| 674 | altstep as_SIP_exp_call_hangup(template (present) integer exp_seq_nr := ?, boolean fail_others := true) runs on SIPConnHdlr |
| 675 | { |
| 676 | var template (present) PDU_SIP_Request exp_req := |
| 677 | tr_SIP_BYE(f_tr_SipUrl_opt_defport(g_pars.local_sip_url_ext), |
| 678 | g_pars.cp.sip_call_id, |
| 679 | g_pars.cp.from_addr, |
| 680 | g_pars.cp.to_addr, |
| 681 | tr_Via_from(f_tr_HostPort(g_pars.remote_sip_host, g_pars.remote_sip_port)), |
| 682 | exp_seq_nr); |
| 683 | var charstring sip_expect_str := log2str(exp_req); |
| 684 | |
| 685 | [] SIP.receive(exp_req) -> value g_rx_sip_req { |
| 686 | var template (value) PDU_SIP_Response tx_resp; |
| 687 | var charstring tx_sdp; |
| 688 | var Via via; |
| 689 | |
| 690 | /* Update parameters: */ |
| 691 | g_pars.cp.sip_seq_nr := g_rx_sip_req.msgHeader.cSeq.seqNumber; |
| 692 | /* "branch" has changed: */ |
| 693 | via := g_rx_sip_req.msgHeader.via; |
| 694 | |
| 695 | /* Tx 200 OK */ |
| 696 | tx_sdp := f_gen_sdp(); |
| 697 | tx_resp := ts_SIP_Response(g_pars.cp.sip_call_id, |
| 698 | g_pars.cp.from_addr, |
| 699 | g_pars.cp.to_addr, |
| 700 | "BYE", 200, |
| 701 | g_pars.cp.sip_seq_nr, |
| 702 | "OK", |
| 703 | via, |
| 704 | body := tx_sdp); |
| 705 | SIP.send(tx_resp); |
| 706 | } |
| 707 | [fail_others] as_SIP_fail_resp(sip_expect_str); |
| 708 | [fail_others] as_SIP_fail_req(sip_expect_str); |
| 709 | } |
| 710 | |
| 711 | } |