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doubango/tinySIP/src/dialogs/tsip_dialog_invite.ect.c

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/*
* Copyright (C) 2010-2011 Mamadou Diop.
*
* Contact: Mamadou Diop <diopmamadou(at)doubango[dot]org>
*
* This file is part of Open Source Doubango Framework.
*
* DOUBANGO is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as publishd by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* DOUBANGO is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with DOUBANGO.
*
*/
/**@file tsip_dialog_invite.ect.c
* @brief Explicit Communication Transfer (ECT) using IP Multimedia (IM) Core Network (CN) subsystem (3GPP TS 24.629)
* The Explicit Communication transfer (ECT) service provides a party involved in a communication to transfer that
* communication to a third party.
* This code inplement Consultative transfer mode (A.2).
*
* @author Mamadou Diop <diopmamadou(at)doubango[dot]org>
*
*/
#include "tinysip/dialogs/tsip_dialog_invite.h"
#include "tinysip/dialogs/tsip_dialog_invite.common.h"
#include "tinysip/parsers/tsip_parser_message.h"
#include "tinysip/headers/tsip_header_Refer_To.h"
#include "tinysip/headers/tsip_header_Referred_By.h"
#include "tinysip/headers/tsip_header_Refer_Sub.h"
#include "tinysip/headers/tsip_header_Supported.h"
#include "tinysip/parsers/tsip_parser_uri.h"
#include "tinymedia/tmedia_defaults.h"
#include "tsk_debug.h"
static int send_NOTIFY(tsip_dialog_invite_t *self, short code, const char* phrase);
static int send_REFER(tsip_dialog_invite_t *self, const char* to);
static short get_SipFragResponseCode(const tsip_request_t* notify);
static tsip_response_t * get_SipFragMessage(const tsip_request_t* notify);
extern int send_RESPONSE(tsip_dialog_invite_t *self, const tsip_request_t* request, short code, const char* phrase, tsk_bool_t force_sdp);
extern int send_ERROR(tsip_dialog_invite_t* self, const tsip_request_t* request, short code, const char* phrase, const char* reason);
extern int send_BYE(tsip_dialog_invite_t *self);
/* ======================== transitions ======================== */
static int x0400_Connected_2_oECTing_X_oECT(va_list *app);
static int x0400_oECTing_2_oECTing_X_i2xx(va_list *app); // should be 202?
static int x0400_oECTing_2_Connected_X_i3456(va_list *app);
static int x0400_oECTing_2_oECTing_X_iNOTIFY(va_list *app); // Notify 1xx
static int x0400_oECTing_2_Connected_X_iNOTIFY(va_list *app); // Notify 200_to_699
static int x0400_Connected_2_iECTreq_X_iREFER(va_list *app);
static int x0400_iECTreq_2_Connected_X_reject(va_list *app);
static int x0400_iECTreq_2_iECTing_X_accept(va_list *app);
static int x0400_iECTing_2_iECTing_X_1xxfNOTIFY(va_list *app);
static int x0400_iECTing_2_Connected_X_23456fNOTIFY(va_list *app);
#define x0400_Connected_2_Connected_X_fREFER tsk_null
/* ======================== conds ======================== */
static tsk_bool_t _fsm_cond_is_resp2REFER(tsip_dialog_invite_t* self, tsip_message_t* message)
{
return TSIP_RESPONSE_IS_TO_REFER(message);
}
static tsk_bool_t _fsm_cond_is_1xxNOTIFY(tsip_dialog_invite_t* self, tsip_request_t* notify)
{
short code = get_SipFragResponseCode(notify);
return (code >= 100 && code <= 199);
}
static tsk_bool_t _fsm_cond_is_23456NOTIFY(tsip_dialog_invite_t* self, tsip_request_t* notify)
{
short code = get_SipFragResponseCode(notify);
return (code >= 200 && code <= 699);
}
static tsk_bool_t _fsm_cond_is_fREFER(tsip_dialog_invite_t* self, tsip_request_t* refer)
{
const tsip_header_Refer_To_t* Refer_To = (const tsip_header_Refer_To_t*)tsip_message_get_header(refer, tsip_htype_Refer_To);
return (!Refer_To || !Refer_To->uri);
}
static tsk_bool_t _fsm_cond_is_1xxfNOTIFY(tsip_dialog_invite_t* self, tsip_response_t* response)
{
short code = TSIP_RESPONSE_CODE(response);
return (code >= 100 && code <= 199);
}
static tsk_bool_t _fsm_cond_is_23456fNOTIFY(tsip_dialog_invite_t* self, tsip_response_t* response)
{
short code = TSIP_RESPONSE_CODE(response);
return (code >= 200 && code <= 699);
}
int tsip_dialog_invite_ect_init(tsip_dialog_invite_t *self)
{
tsk_fsm_set(TSIP_DIALOG_GET_FSM(self),
/*=======================
* === Outgoing Transfer ===
*/
// Connected -> (oREFER) -> oECTing
TSK_FSM_ADD_ALWAYS(_fsm_state_Connected, _fsm_action_oECT, _fsm_state_oECTing, x0400_Connected_2_oECTing_X_oECT, "x0400_Connected_2_oECTing_X_oECT"),
// oECTing -> (i2xx REFER) -> oECTing
TSK_FSM_ADD(_fsm_state_oECTing, _fsm_action_i2xx, _fsm_cond_is_resp2REFER, _fsm_state_oECTing, x0400_oECTing_2_oECTing_X_i2xx, "x0400_oECTing_2_oECTing_X_i2xx"),
// oECTing -> (i300-699 REFER) -> Connected
TSK_FSM_ADD(_fsm_state_oECTing, _fsm_action_i300_to_i699, _fsm_cond_is_resp2REFER, _fsm_state_Connected, x0400_oECTing_2_Connected_X_i3456, "x0400_ECTing_2_Connected_X_i36"),
// oECTing -> (iNotify 1xx sipfrag) -> oECTing
TSK_FSM_ADD(_fsm_state_oECTing, _fsm_action_iNOTIFY, _fsm_cond_is_1xxNOTIFY, _fsm_state_oECTing, x0400_oECTing_2_oECTing_X_iNOTIFY, "x0400_oECTing_2_oECTing_X_iNOTIFY"),
// oECTing -> (iNotify 23456 sipfrag) -> Connected
TSK_FSM_ADD(_fsm_state_oECTing, _fsm_action_iNOTIFY, _fsm_cond_is_23456NOTIFY, _fsm_state_Connected, x0400_oECTing_2_Connected_X_iNOTIFY, "x0400_oECTing_2_Connected_X_iNOTIFY"),
/*=======================
* === Incoming Transfer ===
*/
// Connected -> (iREFER invalid) -> Connected
TSK_FSM_ADD(_fsm_state_Connected, _fsm_action_iREFER, _fsm_cond_is_fREFER, _fsm_state_Connected, x0400_Connected_2_Connected_X_fREFER, "x0400_Connected_2_Connected_X_fREFER"),
// Connected -> (iREFER) -> iECTreq
TSK_FSM_ADD_ALWAYS(_fsm_state_Connected, _fsm_action_iREFER, _fsm_state_iECTreq, x0400_Connected_2_iECTreq_X_iREFER, "x0400_Connected_2_iECTreq_X_iREFER"),
// iECTreq -> (reject) -> Connected
TSK_FSM_ADD_ALWAYS(_fsm_state_iECTreq, _fsm_action_iECT_REJECT, _fsm_state_Connected, x0400_iECTreq_2_Connected_X_reject, "x0400_iECTreq_2_Connected_X_reject"),
// iECTreq -> (accept) -> iECTing
TSK_FSM_ADD_ALWAYS(_fsm_state_iECTreq, _fsm_action_iECT_ACCEPT, _fsm_state_iECTing, x0400_iECTreq_2_iECTing_X_accept, "x0400_iECTreq_2_iECTing_X_accept"),
// iECTing -> (1xx lnotify) -> iECTing
TSK_FSM_ADD(_fsm_state_iECTing, _fsm_action_iECT_lNOTIFY, _fsm_cond_is_1xxfNOTIFY, _fsm_state_iECTing, x0400_iECTing_2_iECTing_X_1xxfNOTIFY, "x0400_iECTing_2_iECTing_X_1xxfNOTIFY"),
// iECTing -> (23456 lnotify) -> Connected
TSK_FSM_ADD(_fsm_state_iECTing, _fsm_action_iECT_lNOTIFY, _fsm_cond_is_23456fNOTIFY, _fsm_state_Connected, x0400_iECTing_2_Connected_X_23456fNOTIFY, "x0400_iECTing_2_Connected_X_23456fNOTIFY"),
TSK_FSM_ADD_NULL());
return 0;
}
//--------------------------------------------------------
// == STATE MACHINE BEGIN ==
//--------------------------------------------------------
// Connected -> (oREFER) -> oECTing
static int x0400_Connected_2_oECTing_X_oECT(va_list *app)
{
int ret;
tsip_dialog_invite_t *self;
const tsip_action_t* action;
self = va_arg(*app, tsip_dialog_invite_t *);
va_arg(*app, const tsip_message_t *);
action = va_arg(*app, const tsip_action_t *);
ret = send_REFER(self, action->ect.to);
if(ret == 0) {
TSIP_DIALOG_INVITE_SIGNAL(self, tsip_o_ect_trying,
tsip_event_code_dialog_request_sent, "Call Transfer Initiated", tsk_null);
}
else; //Must never happen
return ret;
}
// ECTing -> (i2xx REFER) -> oECTing
static int x0400_oECTing_2_oECTing_X_i2xx(va_list *app)
{
tsip_dialog_invite_t *self;
const tsip_response_t* response;
const tsip_header_Refer_Sub_t* Refer_Sub;
self = va_arg(*app, tsip_dialog_invite_t *);
response = va_arg(*app, const tsip_message_t *);
Refer_Sub = (const tsip_header_Refer_Sub_t*)tsip_message_get_header(response, tsip_htype_Refer_Sub);
if(Refer_Sub) {
self->refersub = Refer_Sub->sub;
}
if(tsip_message_required(response, "norefersub")) {
self->required.norefersub = tsk_true;
}
return TSIP_DIALOG_INVITE_SIGNAL(self, tsip_o_ect_accepted,
TSIP_RESPONSE_CODE(response), TSIP_RESPONSE_PHRASE(response), response);
}
// oECTing -> (i300-699 REFER) -> Connected
static int x0400_oECTing_2_Connected_X_i3456(va_list *app)
{
tsip_dialog_invite_t *self;
const tsip_response_t* response;
self = va_arg(*app, tsip_dialog_invite_t *);
response = va_arg(*app, const tsip_message_t *);
return TSIP_DIALOG_INVITE_SIGNAL(self, tsip_o_ect_failed,
TSIP_RESPONSE_CODE(response), TSIP_RESPONSE_PHRASE(response), response);
}
// oECTing -> (iNotify 1xx sipfrag) -> oECTing
static int x0400_oECTing_2_oECTing_X_iNOTIFY(va_list *app)
{
int ret = 0;
tsip_dialog_invite_t *self;
const tsip_request_t* notify;
tsip_response_t *sipfrag = tsk_null;
self = va_arg(*app, tsip_dialog_invite_t *);
notify = va_arg(*app, const tsip_message_t *);
sipfrag = get_SipFragMessage(notify);
if(sipfrag) {
send_RESPONSE(self, notify, 200, "Ok", tsk_false);
TSIP_DIALOG_INVITE_SIGNAL(self, tsip_o_ect_notify,
TSIP_RESPONSE_CODE(sipfrag), TSIP_RESPONSE_PHRASE(sipfrag), notify);
}
TSK_OBJECT_SAFE_FREE(sipfrag);
return ret;
}
// oECTing -> (iNotify 23456 sipfrag) -> Connected
static int x0400_oECTing_2_Connected_X_iNOTIFY(va_list *app)
{
int ret = 0;
tsip_dialog_invite_t *self;
const tsip_request_t* notify;
tsip_response_t *sipfrag = tsk_null;
self = va_arg(*app, tsip_dialog_invite_t *);
notify = va_arg(*app, const tsip_message_t *);
sipfrag = get_SipFragMessage(notify);
if(sipfrag) {
send_RESPONSE(self, notify, 200, "Ok", tsk_false);
TSIP_DIALOG_INVITE_SIGNAL(self, tsip_o_ect_notify,
TSIP_RESPONSE_CODE(sipfrag), TSIP_RESPONSE_PHRASE(sipfrag), notify);
}
TSK_OBJECT_SAFE_FREE(sipfrag);
return ret;
}
// Connected -> (iREFER) -> iECTreq
static int x0400_Connected_2_iECTreq_X_iREFER(va_list *app)
{
int ret;
tsip_dialog_invite_t *self;
const tsip_request_t* refer;
self = va_arg(*app, tsip_dialog_invite_t *);
refer = va_arg(*app, const tsip_message_t *);
TSK_OBJECT_SAFE_FREE(self->last_iRefer);
self->last_iRefer = tsk_object_ref((tsk_object_t*)refer);
ret = send_RESPONSE(self, self->last_iRefer, 100, "Asking for Transfer", tsk_false);
TSIP_DIALOG_INVITE_SIGNAL(self, tsip_i_ect_requested,
tsip_event_code_dialog_request_incoming, "Incoming Request", self->last_iRefer);
return ret;
}
// iECTreq -> (reject) -> Connected
static int x0400_iECTreq_2_Connected_X_reject(va_list *app)
{
int ret;
tsip_dialog_invite_t *self;
const tsip_action_t* action;
short code;
const char* phrase;
char* reason = tsk_null;
self = va_arg(*app, tsip_dialog_invite_t *);
va_arg(*app, const tsip_message_t *);
action = va_arg(*app, const tsip_action_t *);
// Send Reject
code = action->line_resp.code>=300 ? action->line_resp.code : 603;
phrase = action->line_resp.phrase ? action->line_resp.phrase : "Decline Transfer";
tsk_sprintf(&reason, "SIP; cause=%hi; text=\"%s\"", code, phrase);
ret = send_ERROR(self, self->last_iRefer, code, phrase, reason);
TSK_FREE(reason);
return ret;
}
// iECTreq -> (accept) -> iECTing
static int x0400_iECTreq_2_iECTing_X_accept(va_list *app)
{
int ret;
tsip_dialog_invite_t *self;
const tsip_header_Refer_To_t* Refer_To;
const tsip_action_t* action;
self = va_arg(*app, tsip_dialog_invite_t *);
va_arg(*app, const tsip_message_t *);
action = va_arg(*app, const tsip_action_t *);
// Send 200 OK
ret = send_RESPONSE(self, self->last_iRefer, 200, "Transfering", tsk_false);
Refer_To = (const tsip_header_Refer_To_t*)tsip_message_get_header(self->last_iRefer, tsip_htype_Refer_To); // Not null: already checked
// Make call to the referToUri
TSK_OBJECT_SAFE_FREE(self->ss_transf);
self->ss_transf = tsip_ssession_create(TSIP_DIALOG_GET_STACK(self),
TSIP_SSESSION_SET_PARENT_ID(TSIP_DIALOG_GET_SS(self)->id),
TSIP_SSESSION_SET_NULL());
#if TSIP_UNDER_WINDOWS // because of DirectShow Attach()
self->ss_transf->media.type = tmedia_audio;
#else
self->ss_transf->media.type = self->msession_mgr ? self->msession_mgr->type : tmedia_defaults_get_media_type();
#endif
self->ss_transf->owner = tsk_false;// not owned by the end-user -> will be destroyed as soon as the dialog dtor is called
if(ret == 0) {
ret = tsip_invite_event_signal(tsip_i_ect_newcall, self->ss_transf,
tsip_event_code_dialog_request_outgoing, "ECTing", self->last_iRefer);
}
ret = tsip_ssession_set(self->ss_transf,
TSIP_SSESSION_SET_TO_OBJ(Refer_To->uri),
TSIP_SSESSION_SET_NULL());
ret = tsip_api_invite_send_invite(self->ss_transf, self->ss_transf->media.type,
TSIP_ACTION_SET_NULL());
return ret;
}
// iECTing -> (1xx lnotify) -> iECTing
static int x0400_iECTing_2_iECTing_X_1xxfNOTIFY(va_list *app)
{
int ret;
tsip_dialog_invite_t *self;
const tsip_response_t* response;
self = va_arg(*app, tsip_dialog_invite_t *);
response = va_arg(*app, const tsip_message_t *);
// send NOTIFY (event if norefersub enabled) and alert user
ret = send_NOTIFY(self, TSIP_RESPONSE_CODE(response), TSIP_RESPONSE_PHRASE(response));
return ret;
}
// iECTing -> (23456 lnotify) -> Connected
static int x0400_iECTing_2_Connected_X_23456fNOTIFY(va_list *app)
{
int ret;
tsip_dialog_invite_t *self;
const tsip_response_t* response;
short code;
self = va_arg(*app, tsip_dialog_invite_t *);
response = va_arg(*app, const tsip_message_t *);
code = TSIP_RESPONSE_CODE(response);
// send NOTIFY (event if norefersub enabled) and alert user
ret = send_NOTIFY(self, code, TSIP_RESPONSE_PHRASE(response));
if(code >= 200 && code <= 299) {
TSIP_DIALOG_INVITE_SIGNAL(self, tsip_i_ect_completed,
TSIP_RESPONSE_CODE(response), TSIP_RESPONSE_PHRASE(response), self->last_iRefer);
// hang up the call
ret = send_BYE(self);
}
else {
TSIP_DIALOG_INVITE_SIGNAL(self, tsip_i_ect_failed,
TSIP_RESPONSE_CODE(response), TSIP_RESPONSE_PHRASE(response), self->last_iRefer);
}
return ret;
}
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// == STATE MACHINE END ==
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++
static int send_NOTIFY(tsip_dialog_invite_t *self, short code, const char* phrase)
{
tsip_request_t *notify = tsk_null;
int ret = -1;
if((notify = tsip_dialog_request_new(TSIP_DIALOG(self), "NOTIFY"))) {
char* sipfrag = tsk_null;
tsk_sprintf(&sipfrag, "%s %hi %s\r\n", TSIP_MESSAGE_VERSION_DEFAULT, code, phrase);
ret = tsip_message_add_content(notify, "message/sipfrag", sipfrag, tsk_strlen(sipfrag));
ret = tsip_dialog_request_send(TSIP_DIALOG(self), notify);
if(ret == 0) {
TSIP_DIALOG_INVITE_SIGNAL(self, tsip_o_ect_notify, code, phrase, notify);
}
TSK_FREE(sipfrag);
TSK_OBJECT_SAFE_FREE(notify);
}
else {
TSK_DEBUG_ERROR("Failed to create request");
}
return ret;
}
static int send_REFER(tsip_dialog_invite_t *self, const char* to)
{
int ret = 0;
tsip_request_t *refer = tsk_null;
tsip_uri_t* toUri = tsk_null;
if(!self || !to) {
TSK_DEBUG_ERROR("Invalid parameter");
return -1;
}
if(!(toUri = tsip_uri_parse(to, tsk_strlen(to)))) {
TSK_DEBUG_ERROR("Failed to parse %s", to);
return -1;
}
else {
// tsk_params_add_param(&toUri->params, "method", "INVITE");
}
if((refer = tsip_dialog_request_new(TSIP_DIALOG(self), "REFER"))) {
tsk_istr_t cid;
tsk_strrandom(&cid);
/* Add headers */
tsip_message_add_headers(refer,
TSIP_HEADER_REFER_TO_VA_ARGS(toUri),
TSIP_HEADER_REFERRED_BY_VA_ARGS(TSIP_DIALOG_GET_STACK(self)->identity.impu, cid),
TSIP_HEADER_REFER_SUB_VA_ARGS(self->refersub),
tsk_null);
if(self->supported.norefersub) {
tsip_message_add_headers(refer,
TSIP_HEADER_SUPPORTED_VA_ARGS("norefersub"),
tsk_null);
}
ret = tsip_dialog_request_send(TSIP_DIALOG(self), refer);
TSK_OBJECT_SAFE_FREE(refer);
}
TSK_OBJECT_SAFE_FREE(toUri);
return ret;
}
static tsip_response_t * get_SipFragMessage(const tsip_request_t* notify)
{
tsip_response_t *sipfrag = tsk_null;
if(TSIP_MESSAGE_HAS_CONTENT(notify) && tsk_striequals(notify->Content_Type->type, "message/sipfrag")) {
tsk_ragel_state_t state;
tsk_bool_t ret;
char* content = tsk_null;
// sipfrag is a "tsip_message_t" with an extra \r\n
content = tsk_strndup(notify->Content->data, notify->Content->size);
if(tsk_strLastIndexOf(content, tsk_strlen(content), "\r\n") != tsk_strlen(content) - 2) { //Hack for XXX buggy client
tsk_strcat(&content, "\r\n");
}
tsk_strcat(&content, "\r\n");
tsk_ragel_state_init(&state, content, tsk_strlen(content));
ret = tsip_message_parse(&state, &sipfrag, tsk_false);
TSK_FREE(content);
if(ret && TSIP_MESSAGE_IS_RESPONSE(sipfrag)) {
return sipfrag;
}
TSK_OBJECT_SAFE_FREE(sipfrag);
}
return sipfrag;
}
static short get_SipFragResponseCode(const tsip_request_t* notify)
{
tsip_response_t *sipfrag = get_SipFragMessage(notify);
short code = 0;
if(sipfrag) {
code = TSIP_RESPONSE_CODE(sipfrag);
TSK_OBJECT_SAFE_FREE(sipfrag);
}
return code;
}
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