ist_fsm.c
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/*
The oSIP library implements the Session Initiation Protocol (SIP -rfc3261-)
Copyright (C) 2001-2020 Aymeric MOIZARD amoizard@antisip.com
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <osip2/internal.h>
#include <osip2/osip.h>
#include "fsm.h"
transition_t ist_transition[11] = {{IST_PRE_PROCEEDING, RCV_REQINVITE, (void (*)(void *, void *)) & ist_rcv_invite, &ist_transition[1], NULL},
{IST_PROCEEDING, RCV_REQINVITE, (void (*)(void *, void *)) & ist_rcv_invite, &ist_transition[2], NULL},
{IST_COMPLETED, RCV_REQINVITE, (void (*)(void *, void *)) & ist_rcv_invite, &ist_transition[3], NULL},
{IST_COMPLETED, TIMEOUT_G, (void (*)(void *, void *)) & osip_ist_timeout_g_event, &ist_transition[4], NULL},
{IST_COMPLETED, TIMEOUT_H, (void (*)(void *, void *)) & osip_ist_timeout_h_event, &ist_transition[5], NULL},
{IST_PROCEEDING, SND_STATUS_1XX, (void (*)(void *, void *)) & ist_snd_1xx, &ist_transition[6], NULL},
{IST_PROCEEDING, SND_STATUS_2XX, (void (*)(void *, void *)) & ist_snd_2xx, &ist_transition[7], NULL},
{IST_PROCEEDING, SND_STATUS_3456XX, (void (*)(void *, void *)) & ist_snd_3456xx, &ist_transition[8], NULL},
{IST_COMPLETED, RCV_REQACK, (void (*)(void *, void *)) & ist_rcv_ack, &ist_transition[9], NULL},
{IST_CONFIRMED, RCV_REQACK, (void (*)(void *, void *)) & ist_rcv_ack, &ist_transition[10], NULL},
{IST_CONFIRMED, TIMEOUT_I, (void (*)(void *, void *)) & osip_ist_timeout_i_event, NULL, NULL}};
osip_statemachine_t ist_fsm = {ist_transition};
static void ist_handle_transport_error(osip_transaction_t *ist, int err) {
__osip_transport_error_callback(OSIP_IST_TRANSPORT_ERROR, ist, err);
__osip_transaction_set_state(ist, IST_TERMINATED);
__osip_kill_transaction_callback(OSIP_IST_KILL_TRANSACTION, ist);
/* TODO: MUST BE DELETED NOW */
}
void ist_rcv_invite(osip_transaction_t *ist, osip_event_t *evt) {
int i;
if (ist->state == IST_PRE_PROCEEDING) { /* announce new INVITE */
/* Here we have ist->orig_request == NULL */
ist->orig_request = evt->sip;
__osip_message_callback(OSIP_IST_INVITE_RECEIVED, ist, evt->sip);
} else { /* IST_PROCEEDING or IST_COMPLETED */
/* delete retransmission */
osip_message_free(evt->sip);
__osip_message_callback(OSIP_IST_INVITE_RECEIVED_AGAIN, ist, ist->orig_request);
if (ist->last_response != NULL) { /* retransmit last response */
i = __osip_transaction_snd_xxx(ist, ist->last_response);
if (i != 0) {
ist_handle_transport_error(ist, i);
return;
} else {
if (MSG_IS_STATUS_1XX(ist->last_response))
__osip_message_callback(OSIP_IST_STATUS_1XX_SENT, ist, ist->last_response);
else if (MSG_IS_STATUS_2XX(ist->last_response))
__osip_message_callback(OSIP_IST_STATUS_2XX_SENT_AGAIN, ist, ist->last_response);
else
__osip_message_callback(OSIP_IST_STATUS_3456XX_SENT_AGAIN, ist, ist->last_response);
}
}
return;
}
/* we come here only if it was the first INVITE received */
__osip_transaction_set_state(ist, IST_PROCEEDING);
}
void osip_ist_timeout_g_event(osip_transaction_t *ist, osip_event_t *evt) {
int i;
ist->ist_context->timer_g_length = ist->ist_context->timer_g_length * 2;
if (ist->ist_context->timer_g_length > DEFAULT_T2)
ist->ist_context->timer_g_length = DEFAULT_T2;
osip_gettimeofday(&ist->ist_context->timer_g_start, NULL);
add_gettimeofday(&ist->ist_context->timer_g_start, ist->ist_context->timer_g_length);
i = __osip_transaction_snd_xxx(ist, ist->last_response);
if (i != 0) {
ist_handle_transport_error(ist, i);
return;
}
__osip_message_callback(OSIP_IST_STATUS_3456XX_SENT_AGAIN, ist, ist->last_response);
}
void osip_ist_timeout_h_event(osip_transaction_t *ist, osip_event_t *evt) {
ist->ist_context->timer_h_length = -1;
ist->ist_context->timer_h_start.tv_sec = -1;
__osip_transaction_set_state(ist, IST_TERMINATED);
__osip_kill_transaction_callback(OSIP_IST_KILL_TRANSACTION, ist);
}
void osip_ist_timeout_i_event(osip_transaction_t *ist, osip_event_t *evt) {
ist->ist_context->timer_i_length = -1;
ist->ist_context->timer_i_start.tv_sec = -1;
__osip_transaction_set_state(ist, IST_TERMINATED);
__osip_kill_transaction_callback(OSIP_IST_KILL_TRANSACTION, ist);
}
void ist_snd_1xx(osip_transaction_t *ist, osip_event_t *evt) {
int i;
if (ist->last_response != NULL) {
osip_message_free(ist->last_response);
}
ist->last_response = evt->sip;
i = __osip_transaction_snd_xxx(ist, evt->sip);
if (i != 0) {
ist_handle_transport_error(ist, i);
return;
} else
__osip_message_callback(OSIP_IST_STATUS_1XX_SENT, ist, ist->last_response);
/* we are already in the proper state */
return;
}
void ist_snd_2xx(osip_transaction_t *ist, osip_event_t *evt) {
int i;
if (ist->last_response != NULL) {
osip_message_free(ist->last_response);
}
ist->last_response = evt->sip;
i = __osip_transaction_snd_xxx(ist, evt->sip);
if (i != 0) {
ist_handle_transport_error(ist, i);
return;
} else {
__osip_message_callback(OSIP_IST_STATUS_2XX_SENT, ist, ist->last_response);
__osip_transaction_set_state(ist, IST_TERMINATED);
__osip_kill_transaction_callback(OSIP_IST_KILL_TRANSACTION, ist);
}
return;
}
void ist_snd_3456xx(osip_transaction_t *ist, osip_event_t *evt) {
int i;
if (ist->last_response != NULL) {
osip_message_free(ist->last_response);
}
ist->last_response = evt->sip;
i = __osip_transaction_snd_xxx(ist, evt->sip);
if (i != 0) {
ist_handle_transport_error(ist, i);
return;
} else {
if (MSG_IS_STATUS_3XX(ist->last_response))
__osip_message_callback(OSIP_IST_STATUS_3XX_SENT, ist, ist->last_response);
else if (MSG_IS_STATUS_4XX(ist->last_response))
__osip_message_callback(OSIP_IST_STATUS_4XX_SENT, ist, ist->last_response);
else if (MSG_IS_STATUS_5XX(ist->last_response))
__osip_message_callback(OSIP_IST_STATUS_5XX_SENT, ist, ist->last_response);
else
__osip_message_callback(OSIP_IST_STATUS_6XX_SENT, ist, ist->last_response);
}
if (ist->ist_context->timer_g_length != -1) {
osip_gettimeofday(&ist->ist_context->timer_g_start, NULL);
add_gettimeofday(&ist->ist_context->timer_g_start, ist->ist_context->timer_g_length);
}
osip_gettimeofday(&ist->ist_context->timer_h_start, NULL);
add_gettimeofday(&ist->ist_context->timer_h_start, ist->ist_context->timer_h_length);
__osip_transaction_set_state(ist, IST_COMPLETED);
return;
}
void ist_rcv_ack(osip_transaction_t *ist, osip_event_t *evt) {
if (ist->ack != NULL) {
osip_message_free(ist->ack);
}
ist->ack = evt->sip;
if (ist->state == IST_COMPLETED)
__osip_message_callback(OSIP_IST_ACK_RECEIVED, ist, ist->ack);
else /* IST_CONFIRMED */
__osip_message_callback(OSIP_IST_ACK_RECEIVED_AGAIN, ist, ist->ack);
/* set the timer to 0 for reliable, and T4 for unreliable (already set) */
osip_gettimeofday(&ist->ist_context->timer_i_start, NULL);
add_gettimeofday(&ist->ist_context->timer_i_start, ist->ist_context->timer_i_length);
__osip_transaction_set_state(ist, IST_CONFIRMED);
}