/* Timer callback. When the timer is fired, it can be time to refresh * the session if UA is the refresher, otherwise it is time to end * the session. */ static void timer_cb(pj_timer_heap_t *timer_heap, struct pj_timer_entry *entry) { pjsip_inv_session *inv = (pjsip_inv_session*) entry->user_data; pjsip_tx_data *tdata = NULL; pj_status_t status; pj_bool_t as_refresher; pj_assert(inv); PJ_UNUSED_ARG(timer_heap); /* Lock dialog. */ pjsip_dlg_inc_lock(inv->dlg); /* Check our role */ as_refresher = (inv->timer->refresher == TR_UAC && inv->timer->role == PJSIP_ROLE_UAC) || (inv->timer->refresher == TR_UAS && inv->timer->role == PJSIP_ROLE_UAS); /* Do action based on role(refresher or refreshee). * As refresher: * - send refresh, or * - end session if there is no response to the refresh request. * As refreshee: * - end session if there is no refresh request received. */ if (as_refresher && (entry->id != REFRESHER_EXPIRE_TIMER_ID)) { pj_time_val now; /* As refresher, reshedule the refresh request on the following: * - must not send re-INVITE if another INVITE or SDP negotiation * is in progress. * - must not send UPDATE with SDP if SDP negotiation is in progress */ pjmedia_sdp_neg_state neg_state = pjmedia_sdp_neg_get_state(inv->neg); inv->timer->timer.id = 0; if ( (!inv->timer->use_update && ( inv->invite_tsx != NULL || neg_state != PJMEDIA_SDP_NEG_STATE_DONE) ) || (inv->timer->use_update && inv->timer->with_sdp && neg_state != PJMEDIA_SDP_NEG_STATE_DONE ) ) { pj_time_val delay = {1, 0}; inv->timer->timer.id = 1; pjsip_endpt_schedule_timer(inv->dlg->endpt, &inv->timer->timer, &delay); pjsip_dlg_dec_lock(inv->dlg); return; } /* Refresher, refresh the session */ if (inv->timer->use_update) { const pjmedia_sdp_session *offer = NULL; if (inv->timer->with_sdp) { pjmedia_sdp_neg_get_active_local(inv->neg, &offer); } status = pjsip_inv_update(inv, NULL, offer, &tdata); } else { /* Create re-INVITE without modifying session */ pjsip_msg_body *body; const pjmedia_sdp_session *offer = NULL; pj_assert(pjmedia_sdp_neg_get_state(inv->neg) == PJMEDIA_SDP_NEG_STATE_DONE); status = pjsip_inv_invite(inv, &tdata); if (status == PJ_SUCCESS) status = pjmedia_sdp_neg_send_local_offer(inv->pool_prov, inv->neg, &offer); if (status == PJ_SUCCESS) status = pjmedia_sdp_neg_get_neg_local(inv->neg, &offer); if (status == PJ_SUCCESS) { status = pjsip_create_sdp_body(tdata->pool, (pjmedia_sdp_session*)offer, &body); tdata->msg->body = body; } } pj_gettimeofday(&now); PJ_LOG(4, (inv->pool->obj_name, "Refreshing session after %ds (expiration period=%ds)", (now.sec-inv->timer->last_refresh.sec), inv->timer->setting.sess_expires)); } else { pj_time_val now; if (as_refresher) inv->timer->expire_timer.id = 0; else inv->timer->timer.id = 0; /* Terminate the session */ status = pjsip_inv_end_session(inv, PJSIP_SC_REQUEST_TIMEOUT, NULL, &tdata); pj_gettimeofday(&now); PJ_LOG(3, (inv->pool->obj_name, "No session %s received after %ds " "(expiration period=%ds), stopping session now!", (as_refresher?"refresh response":"refresh"), (now.sec-inv->timer->last_refresh.sec), inv->timer->setting.sess_expires)); } /* Unlock dialog. */ pjsip_dlg_dec_lock(inv->dlg); /* Send message, if any */ if (tdata && status == PJ_SUCCESS) { inv->timer->refresh_tdata = tdata; status = pjsip_inv_send_msg(inv, tdata); } /* Print error message, if any */ if (status != PJ_SUCCESS) { PJ_PERROR(2, (inv->pool->obj_name, status, "Error in %s session timer", ((as_refresher && entry->id != REFRESHER_EXPIRE_TIMER_ID)? "refreshing" : "terminating"))); } }
/* Timer callback. When the timer is fired, it can be time to refresh * the session if UA is the refresher, otherwise it is time to end * the session. */ void timer_cb(pj_timer_heap_t *timer_heap, struct pj_timer_entry *entry) { pjsip_inv_session *inv = (pjsip_inv_session*) entry->user_data; pjsip_tx_data *tdata = NULL; pj_status_t status; pj_bool_t as_refresher; pj_assert(inv); PJ_UNUSED_ARG(timer_heap); /* When there is a pending INVITE transaction, delay/reschedule this timer * for five seconds to cover the case that pending INVITE fails and the * previous session is still active. If the pending INVITE is successful, * timer state will be updated, i.e: restarted or stopped. */ if (inv->invite_tsx != NULL) { pj_time_val delay = {5}; inv->timer->timer.id = 1; pjsip_endpt_schedule_timer(inv->dlg->endpt, &inv->timer->timer, &delay); return; } /* Lock dialog. */ pjsip_dlg_inc_lock(inv->dlg); /* Check our role */ as_refresher = (inv->timer->refresher == TR_UAC && inv->timer->role == PJSIP_ROLE_UAC) || (inv->timer->refresher == TR_UAS && inv->timer->role == PJSIP_ROLE_UAS); /* Do action based on role, refresher or refreshee */ if (as_refresher) { pj_time_val now; /* Refresher, refresh the session */ if (inv->timer->use_update) { /* Create UPDATE request without offer */ status = pjsip_inv_update(inv, NULL, NULL, &tdata); } else { /* Create re-INVITE without modifying session */ pjsip_msg_body *body; const pjmedia_sdp_session *offer = NULL; pj_assert(pjmedia_sdp_neg_get_state(inv->neg) == PJMEDIA_SDP_NEG_STATE_DONE); status = pjsip_inv_invite(inv, &tdata); if (status == PJ_SUCCESS) status = pjmedia_sdp_neg_send_local_offer(inv->pool_prov, inv->neg, &offer); if (status == PJ_SUCCESS) status = pjmedia_sdp_neg_get_neg_local(inv->neg, &offer); if (status == PJ_SUCCESS) { status = pjsip_create_sdp_body(tdata->pool, (pjmedia_sdp_session*)offer, &body); tdata->msg->body = body; } } pj_gettimeofday(&now); PJ_LOG(4, (inv->pool->obj_name, "Refresh session after %ds (expiration period=%ds)", (now.sec-inv->timer->last_refresh.sec), inv->timer->setting.sess_expires)); } else { pj_time_val now; /* Refreshee, terminate the session */ status = pjsip_inv_end_session(inv, PJSIP_SC_REQUEST_TIMEOUT, NULL, &tdata); pj_gettimeofday(&now); PJ_LOG(3, (inv->pool->obj_name, "No session refresh received after %ds " "(expiration period=%ds), stopping session now!", (now.sec-inv->timer->last_refresh.sec), inv->timer->setting.sess_expires)); } /* Unlock dialog. */ pjsip_dlg_dec_lock(inv->dlg); /* Send message, if any */ if (tdata && status == PJ_SUCCESS) { status = pjsip_inv_send_msg(inv, tdata); } /* Print error message, if any */ if (status != PJ_SUCCESS) { char errmsg[PJ_ERR_MSG_SIZE]; if (tdata) pjsip_tx_data_dec_ref(tdata); pj_strerror(status, errmsg, sizeof(errmsg)); PJ_LOG(2, (inv->pool->obj_name, "Session timer fails in %s session, " "err code=%d (%s)", (as_refresher? "refreshing" : "terminating"), status, errmsg)); } }