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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 "../libsample/sample.h"
#include "../liblogging/logging.h"
#include "../libmobile/get_time.h"
#include "cnetz.h"
#include "database.h"
#include "sysinfo.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_WIEDERHOLUNG 60.0 /* when busy */
typedef struct cnetz_database {
struct cnetz_database *next;
int ogk_kanal; /* available on which channel */
uint8_t futln_nat; /* who ... */
uint8_t futln_fuvst;
uint16_t futln_rest;
int futelg_bit; /* chip card inside */
int extended; /* mobile supports extended frequencies */
int eingebucht; /* set if still available */
double last_seen;
int busy; /* set if currently in a call */
struct osmo_timer_list timer; /* timer for next availability check */
int retry; /* counts number of retries */
} cnetz_db_t;
cnetz_db_t *cnetz_db_head;
static const char *print_meldeaufrufe(int versuche)
{
static char text[32];
if (versuche <= 0)
return "infinite";
sprintf(text, "%d", versuche);
return text;
}
/* 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)) {
LOGP(DDB, LOGL_ERROR, "Subscriber not in list, please fix!!\n");
abort();
}
*dbp = db->next;
LOGP(DDB, LOGL_INFO, "Removing subscriber '%d,%d,%05d' from database.\n", db->futln_nat, db->futln_fuvst, db->futln_rest);
osmo_timer_del(&db->timer);
free(db);
}
/* Timeout handling */
static void db_timeout(void *data)
{
cnetz_db_t *db = data;
int rc;
LOGP(DDB, LOGL_INFO, "Check, if subscriber '%d,%d,%05d' 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, db->ogk_kanal);
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. */
LOGP(DDB, LOGL_INFO, "OgK busy, so we assume a positive response.\n");
osmo_timer_schedule(&db->timer, si.meldeinterval,0); /* when to check avaiability again */
db->retry = 0;
}
}
/* create/update db entry */
int update_db(uint8_t futln_nat, uint8_t futln_fuvst, uint16_t futln_rest, int ogk_kanal, int *futelg_bit, int *extended, int busy, int failed)
{
cnetz_db_t *db, **dbp;
/* search transaction for this subscriber */
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) {
LOGP(DDB, LOGL_ERROR, "No memory!\n");
return 0;
}
osmo_timer_setup(&db->timer, db_timeout, db);
db->eingebucht = 1;
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;
LOGP(DDB, LOGL_INFO, "Adding subscriber '%d,%d,%05d' to database.\n", db->futln_nat, db->futln_fuvst, db->futln_rest);
}
if (ogk_kanal)
db->ogk_kanal = ogk_kanal;
if (futelg_bit && *futelg_bit >= 0)
db->futelg_bit = *futelg_bit;
if (extended && *extended >= 0)
db->extended = *extended;
db->busy = busy;
if (busy) {
LOGP(DDB, LOGL_INFO, "Subscriber '%d,%d,%05d' on OGK channel #%d is busy now.\n", db->futln_nat, db->futln_fuvst, db->futln_rest, db->ogk_kanal);
osmo_timer_del(&db->timer);
} else if (!failed) {
LOGP(DDB, LOGL_INFO, "Subscriber '%d,%d,%05d' on OGK channel #%d is idle now.\n", db->futln_nat, db->futln_fuvst, db->futln_rest, db->ogk_kanal);
osmo_timer_schedule(&db->timer, si.meldeinterval,0); /* when to check avaiability (again) */
db->retry = 0;
db->eingebucht = 1;
db->last_seen = get_time();
} else {
db->retry++;
LOGP(DDB, LOGL_NOTICE, "Paging subscriber '%d,%d,%05d' on OGK channel #%d failed (try %d of %s).\n", db->futln_nat, db->futln_fuvst, db->futln_rest, db->ogk_kanal, db->retry, print_meldeaufrufe(si.meldeaufrufe));
if (si.meldeaufrufe && db->retry == si.meldeaufrufe) {
LOGP(DDB, LOGL_INFO, "Marking subscriber as gone.\n");
db->eingebucht = 0;
return db->extended;
}
osmo_timer_schedule(&db->timer, (si.meldeinterval < MELDE_WIEDERHOLUNG) ? si.meldeinterval : MELDE_WIEDERHOLUNG,0); /* when to do retry */
}
if (futelg_bit)
*futelg_bit = db->futelg_bit;
if (extended)
*extended = db->extended;
return 0;
}
int find_db(uint8_t futln_nat, uint8_t futln_fuvst, uint16_t futln_rest, int *ogk_kanal, int *futelg_bit, int *extended)
{
cnetz_db_t *db = cnetz_db_head;
while (db) {
if (db->eingebucht
&& db->futln_nat == futln_nat
&& db->futln_fuvst == futln_fuvst
&& db->futln_rest == futln_rest) {
if (ogk_kanal)
*ogk_kanal = db->ogk_kanal;
if (futelg_bit)
*futelg_bit = db->futelg_bit;
if (extended)
*extended = db->extended;
return 0;
}
db = db->next;
}
return -1;
}
void flush_db(void)
{
while (cnetz_db_head)
remove_db(cnetz_db_head);
}
void dump_db(void)
{
cnetz_db_t *db = cnetz_db_head;
double now = get_time();
int last;
char attached[16];
LOGP(DDB, LOGL_NOTICE, "Dump of subscriber database:\n");
if (!db) {
LOGP(DDB, LOGL_NOTICE, " - No subscribers attached!\n");
return;
}
LOGP(DDB, LOGL_NOTICE, "Subscriber\tAttached\tBusy\t\tLast seen\tMeldeaufrufe\n");
LOGP(DDB, LOGL_NOTICE, "-------------------------------------------------------------------------------\n");
while (db) {
last = (db->busy) ? 0 : (uint32_t)(now - db->last_seen);
sprintf(attached, "YES (OGK %d)", db->ogk_kanal);
LOGP(DDB, LOGL_NOTICE, "%d,%d,%05d\t%s\t%s\t\t%02d:%02d:%02d \t%d/%s\n", db->futln_nat, db->futln_fuvst, db->futln_rest, (db->eingebucht) ? attached : "-no-\t", (db->busy) ? "YES" : "-no-", last / 3600, (last / 60) % 60, last % 60, db->retry, print_meldeaufrufe(si.meldeaufrufe));
db = db->next;
}
}
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