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/*
Copyright Jeroen Vreeken (jeroen@vreeken.net), 2020
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 <dml/dml.h>
#include <eth_ar/eth_ar.h>
#include <stdio.h>
#include <string.h>
#define DML_GUARD_TIME_MS (200)
static uint8_t tx_level = 0;
static uint8_t tx_call[ETH_AR_MAC_SIZE] = {0};
static uint8_t ex_call[ETH_AR_MAC_SIZE] = {0};
static uint8_t ex_level = 0;
static gboolean guard_cb(void *arg)
{
printf("No incomming activity, releasing guard\n");
tx_level = 0;
return G_SOURCE_REMOVE;
}
int dml_voice_data_level_check(void *data, size_t data_size)
{
unsigned char *datab = data;
uint8_t level = datab[7];
if (!memcmp(data, ex_call, ETH_AR_MAC_SIZE) && level == ex_level) {
printf("Dropped due to rx loop guard\n");
return -1;
}
if (level > tx_level) {
char call[ETH_AR_CALL_SIZE];
int ssid;
bool multicast;
eth_ar_mac2call(call, &ssid, &multicast, data);
tx_level = level;
memcpy(tx_call, data, ETH_AR_MAC_SIZE);
printf("State changed to %s (level=%d) by %s-%d\n", level ? "ON":"OFF", level, multicast ? "MULTICAST" : call, ssid);
} else {
/* once we accept one connection, don't allow it to be hijacked by someone else */
if (memcmp(data, tx_call, ETH_AR_MAC_SIZE)) {
printf("Dropped due to tx guard\n");
return -1;
}
tx_level = level;
printf("Accepted\n");
g_source_remove_by_user_data(&tx_level);
g_timeout_add(DML_GUARD_TIME_MS, guard_cb, &tx_level);
}
return 0;
}
void dml_voice_data_exclude(char call[ETH_AR_MAC_SIZE], uint8_t level)
{
memcpy(ex_call, call, ETH_AR_MAC_SIZE);
ex_level = level;
}