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/*
Copyright Jeroen Vreeken (jeroen@vreeken.net), 2016
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 "interface.h"
#include <eth_ar/fprs.h>
#include <eth_ar/eth_ar.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#include <sys/select.h>
static char *netname = "freedv";
static uint8_t taddr[6];
static enum fprs_type el = FPRS_ERROR;
static bool done = false;
static int cb(uint8_t to[6], uint8_t from[6], uint16_t eth_type, uint8_t *data, size_t len)
{
struct fprs_frame *frame = fprs_frame_create();
if (!frame)
return -1;
fprs_frame_data_set(frame, data, len);
struct fprs_element *el_callsign;
struct fprs_element *el_requested;
el_callsign = fprs_frame_element_by_type(frame, FPRS_CALLSIGN);
el_requested = fprs_frame_element_by_type(frame, el);
if (!el_callsign || !el_requested)
goto skip;
if (memcmp(taddr, fprs_element_data(el_callsign), 6))
goto skip;
char *el_str = fprs_element2stra(el_requested);
printf("%s\n", el_str);
free(el_str);
done = true;
skip:
fprs_frame_destroy(frame);
return 0;
}
static void usage(void)
{
printf("Options:\n");
printf("-e [element]\telement type\n");
printf("-c [call]\town callsign\n");
printf("-t [call]\ttarget callsign\n");
printf("-n [dev]\tNetwork device name (default: \"%s\")\n", netname);
}
int main(int argc, char **argv)
{
int opt;
int fd_int;
uint8_t bcast[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
uint8_t myaddr[6];
char *call = NULL;
char *target = NULL;
time_t stop_listen = 60;
time_t interval = 10;
time_t retry;
while ((opt = getopt(argc, argv, "c:n:t:e:")) != -1) {
switch(opt) {
case 'c':
call = optarg;
break;
case 'e':
el = atoi(optarg);
break;
case 't':
target = optarg;
break;
case 'n':
netname = optarg;
break;
default:
goto err_usage;
}
}
fd_int = interface_init(netname, NULL, false, ETH_P_FPRS);
if (fd_int < 0) {
printf("Could not open interface: %s\n", strerror(errno));
return -1;
}
if (!call || eth_ar_callssid2mac(myaddr, call, false)) {
printf("From callsign could not be converted to a valid MAC address\n");
goto err_usage;
}
if (!target || eth_ar_callssid2mac(taddr, target, false)) {
printf("Target callsign could not be converted to a valid MAC address\n");
goto err_usage;
}
struct fprs_frame *frame = fprs_frame_create();
fprs_frame_add_callsign(frame, myaddr);
fprs_frame_add_request(frame, taddr, &el, 1);
uint8_t *data;
size_t size;
size = fprs_frame_data_size(frame);
data = calloc(size, sizeof(uint8_t));
if (!data)
goto err_fatal;
fprs_frame_data_get(frame, data, &size);
stop_listen += time(NULL);
retry = time(NULL);
do {
struct timeval timeout;
if (retry > stop_listen) {
retry = stop_listen;
}
timeout.tv_usec = 0;
timeout.tv_sec = retry - time(NULL);
if (timeout.tv_sec < 0)
timeout.tv_sec = 0;
fd_set fdr;
FD_ZERO(&fdr);
FD_SET(fd_int, &fdr);
select(fd_int + 1, &fdr, NULL, NULL, &timeout);
if (FD_ISSET(fd_int, &fdr)) {
interface_tx_raw(cb);
}
if (!done) {
interface_rx_raw(bcast, myaddr, ETH_P_FPRS, data, size);
retry += interval;
}
} while (!done && time(NULL) < stop_listen);
free(data);
return 0;
err_fatal:
printf("FATAL ERROR\n");
err_usage:
usage();
return -1;
}