nist_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 nist_transition[10] = {
{NIST_PRE_TRYING, RCV_REQUEST, (void (*)(void *, void *)) & nist_rcv_request, &nist_transition[1], NULL}, {NIST_TRYING, SND_STATUS_1XX, (void (*)(void *, void *)) & nist_snd_1xx, &nist_transition[2], NULL},
{NIST_TRYING, SND_STATUS_2XX, (void (*)(void *, void *)) & nist_snd_23456xx, &nist_transition[3], NULL}, {NIST_TRYING, SND_STATUS_3456XX, (void (*)(void *, void *)) & nist_snd_23456xx, &nist_transition[4], NULL},
{NIST_PROCEEDING, SND_STATUS_1XX, (void (*)(void *, void *)) & nist_snd_1xx, &nist_transition[5], NULL}, {NIST_PROCEEDING, SND_STATUS_2XX, (void (*)(void *, void *)) & nist_snd_23456xx, &nist_transition[6], NULL},
{NIST_PROCEEDING, SND_STATUS_3456XX, (void (*)(void *, void *)) & nist_snd_23456xx, &nist_transition[7], NULL}, {NIST_PROCEEDING, RCV_REQUEST, (void (*)(void *, void *)) & nist_rcv_request, &nist_transition[8], NULL},
{NIST_COMPLETED, TIMEOUT_J, (void (*)(void *, void *)) & osip_nist_timeout_j_event, &nist_transition[9], NULL}, {NIST_COMPLETED, RCV_REQUEST, (void (*)(void *, void *)) & nist_rcv_request, NULL, NULL}};
osip_statemachine_t nist_fsm = {nist_transition};
static void nist_handle_transport_error(osip_transaction_t *nist, int err) {
__osip_transport_error_callback(OSIP_NIST_TRANSPORT_ERROR, nist, err);
__osip_transaction_set_state(nist, NIST_TERMINATED);
__osip_kill_transaction_callback(OSIP_NIST_KILL_TRANSACTION, nist);
/* TODO: MUST BE DELETED NOW */
}
void nist_rcv_request(osip_transaction_t *nist, osip_event_t *evt) {
int i;
if (nist->state == NIST_PRE_TRYING) { /* announce new REQUEST */
/* Here we have ist->orig_request == NULL */
nist->orig_request = evt->sip;
if (MSG_IS_REGISTER(evt->sip))
__osip_message_callback(OSIP_NIST_REGISTER_RECEIVED, nist, nist->orig_request);
else if (MSG_IS_BYE(evt->sip))
__osip_message_callback(OSIP_NIST_BYE_RECEIVED, nist, nist->orig_request);
else if (MSG_IS_OPTIONS(evt->sip))
__osip_message_callback(OSIP_NIST_OPTIONS_RECEIVED, nist, nist->orig_request);
else if (MSG_IS_INFO(evt->sip))
__osip_message_callback(OSIP_NIST_INFO_RECEIVED, nist, nist->orig_request);
else if (MSG_IS_CANCEL(evt->sip))
__osip_message_callback(OSIP_NIST_CANCEL_RECEIVED, nist, nist->orig_request);
else if (MSG_IS_NOTIFY(evt->sip))
__osip_message_callback(OSIP_NIST_NOTIFY_RECEIVED, nist, nist->orig_request);
else if (MSG_IS_SUBSCRIBE(evt->sip))
__osip_message_callback(OSIP_NIST_SUBSCRIBE_RECEIVED, nist, nist->orig_request);
else
__osip_message_callback(OSIP_NIST_UNKNOWN_REQUEST_RECEIVED, nist, nist->orig_request);
} else { /* NIST_PROCEEDING or NIST_COMPLETED */
/* delete retransmission */
osip_message_free(evt->sip);
__osip_message_callback(OSIP_NIST_REQUEST_RECEIVED_AGAIN, nist, nist->orig_request);
if (nist->last_response != NULL) { /* retransmit last response */
i = __osip_transaction_snd_xxx(nist, nist->last_response);
if (i != 0) {
nist_handle_transport_error(nist, i);
return;
} else {
if (MSG_IS_STATUS_1XX(nist->last_response))
__osip_message_callback(OSIP_NIST_STATUS_1XX_SENT, nist, nist->last_response);
else if (MSG_IS_STATUS_2XX(nist->last_response))
__osip_message_callback(OSIP_NIST_STATUS_2XX_SENT_AGAIN, nist, nist->last_response);
else
__osip_message_callback(OSIP_NIST_STATUS_3456XX_SENT_AGAIN, nist, nist->last_response);
return;
}
}
/* we are already in the proper state */
return;
}
/* we come here only if it was the first REQUEST received */
__osip_transaction_set_state(nist, NIST_TRYING);
}
void nist_snd_1xx(osip_transaction_t *nist, osip_event_t *evt) {
int i;
if (nist->last_response != NULL) {
osip_message_free(nist->last_response);
}
nist->last_response = evt->sip;
i = __osip_transaction_snd_xxx(nist, nist->last_response);
if (i != 0) {
nist_handle_transport_error(nist, i);
return;
} else
__osip_message_callback(OSIP_NIST_STATUS_1XX_SENT, nist, nist->last_response);
__osip_transaction_set_state(nist, NIST_PROCEEDING);
}
void nist_snd_23456xx(osip_transaction_t *nist, osip_event_t *evt) {
int i;
if (nist->last_response != NULL) {
osip_message_free(nist->last_response);
}
nist->last_response = evt->sip;
i = __osip_transaction_snd_xxx(nist, nist->last_response);
if (i != 0) {
nist_handle_transport_error(nist, i);
return;
} else {
if (EVT_IS_SND_STATUS_2XX(evt))
__osip_message_callback(OSIP_NIST_STATUS_2XX_SENT, nist, nist->last_response);
else if (MSG_IS_STATUS_3XX(nist->last_response))
__osip_message_callback(OSIP_NIST_STATUS_3XX_SENT, nist, nist->last_response);
else if (MSG_IS_STATUS_4XX(nist->last_response))
__osip_message_callback(OSIP_NIST_STATUS_4XX_SENT, nist, nist->last_response);
else if (MSG_IS_STATUS_5XX(nist->last_response))
__osip_message_callback(OSIP_NIST_STATUS_5XX_SENT, nist, nist->last_response);
else
__osip_message_callback(OSIP_NIST_STATUS_6XX_SENT, nist, nist->last_response);
}
if (nist->state != NIST_COMPLETED) { /* start J timer */
osip_gettimeofday(&nist->nist_context->timer_j_start, NULL);
add_gettimeofday(&nist->nist_context->timer_j_start, nist->nist_context->timer_j_length);
}
__osip_transaction_set_state(nist, NIST_COMPLETED);
}
void osip_nist_timeout_j_event(osip_transaction_t *nist, osip_event_t *evt) {
nist->nist_context->timer_j_length = -1;
nist->nist_context->timer_j_start.tv_sec = -1;
__osip_transaction_set_state(nist, NIST_TERMINATED);
__osip_kill_transaction_callback(OSIP_NIST_KILL_TRANSACTION, nist);
}