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/* C-Netz database
*
* (C) 2016 by Andreas Eversberg <jolly@eversberg.eu>
* All Rights Reserved
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "../common/sample.h"
#include "../common/debug.h"
#include "../common/timer.h"
#include "cnetz.h"
#include "database.h"
/* the network specs say: check every 1 - 6.5 minutes for availability
* remove from database after 3 subsequent failures
* the phone will register 20 minutes after no call / no paging from network.
*/
#define MELDE_INTERVAL 120.0
#define MELDE_WIEDERHOLUNG 60.0
#define MELDE_MAXIMAL 3
typedef struct cnetz_database {
struct cnetz_database *next;
uint8_t futln_nat; /* who ... */
uint8_t futln_fuvst;
uint16_t futln_rest;
int extended; /* mobile supports extended frequencies */
struct timer timer; /* timer for next availability check */
int retry; /* counts number of retries */
} cnetz_db_t;
cnetz_db_t *cnetz_db_head;
/* destroy transaction */
static void remove_db(cnetz_db_t *db)
{
cnetz_db_t **dbp;
/* uinlink */
dbp = &cnetz_db_head;
while (*dbp && *dbp != db)
dbp = &((*dbp)->next);
if (!(*dbp)) {
PDEBUG(DDB, DEBUG_ERROR, "Subscriber not in list, please fix!!\n");
abort();
}
*dbp = db->next;
PDEBUG(DDB, DEBUG_INFO, "Removing subscriber '%d,%d,%d' from database.\n", db->futln_nat, db->futln_fuvst, db->futln_rest);
timer_exit(&db->timer);
free(db);
}
/* Timeout handling */
static void db_timeout(struct timer *timer)
{
cnetz_db_t *db = (cnetz_db_t *)timer->priv;
int rc;
PDEBUG(DDB, DEBUG_INFO, "Check, if subscriber '%d,%d,%d' is still available.\n", db->futln_nat, db->futln_fuvst, db->futln_rest);
rc = cnetz_meldeaufruf(db->futln_nat, db->futln_fuvst, db->futln_rest);
if (rc < 0) {
/* OgK is used for speech, but this never happens in a real
* network. We just assume that the phone has responded and
* assume we had a response. */
PDEBUG(DDB, DEBUG_INFO, "OgK busy, so we assume a positive response.\n");
timer_start(&db->timer, MELDE_INTERVAL); /* when to check avaiability again */
db->retry = 0;
}
}
/* create/update db entry */
int update_db(cnetz_t __attribute__((unused)) *cnetz, uint8_t futln_nat, uint8_t futln_fuvst, uint16_t futln_rest, int extended, int busy, int failed)
{
cnetz_db_t *db, **dbp;
/* search transaction for this subsriber */
db = cnetz_db_head;
while (db) {
if (db->futln_nat == futln_nat
&& db->futln_fuvst == futln_fuvst
&& db->futln_rest == futln_rest)
break;
db = db->next;
}
if (!db) {
db = calloc(1, sizeof(*db));
if (!db) {
PDEBUG(DDB, DEBUG_ERROR, "No memory!\n");
return 0;
}
timer_init(&db->timer, db_timeout, db);
db->futln_nat = futln_nat;
db->futln_fuvst = futln_fuvst;
db->futln_rest = futln_rest;
/* attach to end of list */
dbp = &cnetz_db_head;
while (*dbp)
dbp = &((*dbp)->next);
*dbp = db;
PDEBUG(DDB, DEBUG_INFO, "Adding subscriber '%d,%d,%d' to database.\n", db->futln_nat, db->futln_fuvst, db->futln_rest);
}
if (extended >= 0)
db->extended = extended;
if (busy) {
PDEBUG(DDB, DEBUG_INFO, "Subscriber '%d,%d,%d' busy now.\n", db->futln_nat, db->futln_fuvst, db->futln_rest);
timer_stop(&db->timer);
} else if (!failed) {
PDEBUG(DDB, DEBUG_INFO, "Subscriber '%d,%d,%d' idle now.\n", db->futln_nat, db->futln_fuvst, db->futln_rest);
timer_start(&db->timer, MELDE_INTERVAL); /* when to check avaiability (again) */
db->retry = 0;
} else {
db->retry++;
PDEBUG(DDB, DEBUG_NOTICE, "Paging subscriber '%d,%d,%d' failed (try %d of %d).\n", db->futln_nat, db->futln_fuvst, db->futln_rest, db->retry, MELDE_MAXIMAL);
if (db->retry == MELDE_MAXIMAL) {
remove_db(db);
return db->extended;
}
timer_start(&db->timer, MELDE_WIEDERHOLUNG); /* when to do retry */
}
return db->extended;
}
int find_db(uint8_t futln_nat, uint8_t futln_fuvst, uint16_t futln_rest)
{
cnetz_db_t *db = cnetz_db_head;
while (db) {
if (db->futln_nat == futln_nat
&& db->futln_fuvst == futln_fuvst
&& db->futln_rest == futln_rest)
return 1;
db = db->next;
}
return 0;
}
void flush_db(void)
{
while (cnetz_db_head)
remove_db(cnetz_db_head);
}
void dump_db(void)
{
cnetz_db_t *db = cnetz_db_head;
PDEBUG(DDB, DEBUG_NOTICE, "Dump of subscriber database:\n");
if (!db) {
PDEBUG(DDB, DEBUG_NOTICE, " - No subscribers attached!\n");
return;
}
while (db) {
PDEBUG(DDB, DEBUG_NOTICE, " - Subscriber '%d,%d,%d' is attached.\n", db->futln_nat, db->futln_fuvst, db->futln_rest);
db = db->next;
}
}
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