An implementation of Analog cellular networks like A-Netz, B-Netz, C-Netz, NMT, AMPS, TACS, JTACS, Radiocom 2000, IMTS, MPT1327, Eurosignal and more http://osmocom-analog.eversberg.eu/
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osmocom-analog/src/magnetic/main.c

368 lines
11 KiB

/* main function
*
* (C) 2021 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/>.
*/
#ifndef ARDUINO
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <errno.h>
#include "../libsample/sample.h"
#include "../libsound/sound.h"
#include "../libwave/wave.h"
#include "../libdebug/debug.h"
#include "../liboptions/options.h"
#include "../libaaimage/aaimage.h"
#include "iso7811.h"
int num_kanal = 1;
static int quit = 0;
#ifdef HAVE_ALSA
static void *sound = NULL;
static int dsp_buffer = 50;
#endif
static int dsp_samplerate = 48000;
static const char *dsp_audiodev = "hw:0,0";
static const char *wave_file = NULL;
static int baudrate = 2666;
static const char *sicherung = "12345";
/* Measurements done in summer 2021 with an original card, applied with iron oxyde. */
/* Conforms to Track 3 (210 bpi) with 60 bits lead-in, 20 digits data, about 550 bits lead out */
/* Note that LEAD_OUT here is longer, because the switch must be manually pressed during lead-out. */
#define CNETZ_LEAD_IN 12 /* number of zero-digits before start sentinel (60 bits) */
#define CNETZ_LEAD_OUT 150 /* number of zero-digits after LRC sentinel */
#define CNETZ_SWITCH_ON 27 /* switch closing during lead-out, in digit-duration */
#define CNETZ_SWITCH_OFF 42 /* switch opening during lead-out, in digit-duration */
void print_help(const char *arg0)
{
printf("Usage: %s [options] -a hw:0,0 <number> | service\n", arg0);
/* - - */
printf("General options:\n");
printf(" -h --help\n");
printf(" This help\n");
printf(" --config [~/]<path to config file>\n");
printf(" Give a config file to use. If it starts with '~/', path is at home dir.\n");
printf(" Each line in config file is one option, '-' or '--' must not be given!\n");
debug_print_help();
printf(" -a --audio-device hw:<card>,<device>\n");
printf(" Input audio from sound card's device number\n");
printf(" -s --samplerate <sample rate>\n");
printf(" Give audio device sample rate in Hz. (default = %d)\n", dsp_samplerate);
printf(" -w --write-wave <filename>\n");
printf(" Output sound as wave file\n");
printf("\nMagnetic card simulator options:\n");
printf(" -B --baud-rate <baud>\n");
printf(" Playback baud rate (default = %d)\n", baudrate);
printf(" -S --sicherung <security code>\n");
printf(" Card's security code for simple authentication (default = '%s')\n", sicherung);
printf("\n<number>: Give any valid 7 digit (optionally 8 digit) subscriber number. May\n");
printf(" be prefixed with 0160.\n");
printf("\n'service': BSA44 service card (to unlock phone after battery replacement)\n");
}
void add_options(void)
{
option_add('h', "help", 0);
option_add('v', "debug", 1);
option_add('a', "audio-device", 1);
option_add('s', "samplerate", 1);
option_add('w', "write-wave", 1);
option_add('B', "baud-rate", 1);
option_add('S', "sicherung", 1);
};
int handle_options(int short_option, int argi, char **argv)
{
int rc;
switch (short_option) {
case 'h':
print_help(argv[0]);
return 0;
case 'v':
if (!strcasecmp(argv[argi], "list")) {
debug_list_cat();
return 0;
}
rc = parse_debug_opt(argv[argi]);
if (rc < 0) {
fprintf(stderr, "Failed to parse debug option, please use -h for help.\n");
return rc;
}
break;
case 'a':
dsp_audiodev = options_strdup(argv[argi]);
break;
case 's':
dsp_samplerate = atof(argv[argi]);
break;
case 'w':
wave_file = options_strdup(argv[argi]);
break;
case 'B':
baudrate = atoi(argv[argi]);
break;
case 'S':
sicherung = options_strdup(argv[argi]);
break;
default:
return -EINVAL;
}
return 1;
}
void sighandler(int sigset)
{
if (sigset == SIGHUP)
return;
if (sigset == SIGPIPE)
return;
printf("Signal received: %d\n", sigset);
quit = -1;
}
int main(int argc, char *argv[])
{
const char *number;
char string[19];
uint8_t data[CNETZ_LEAD_IN + 21 + CNETZ_LEAD_OUT];
int length;
int rc, argi;
int i, j;
debuglevel = DEBUG_INFO;
add_options();
rc = options_config_file(argc, argv, "~/.osmocom/analog/magnetic.conf", handle_options);
if (rc < 0)
return 0;
/* parse command line */
argi = options_command_line(argc, argv, handle_options);
if (argi <= 0)
return argi;
if (argi >= argc) {
fprintf(stderr, "Expecting phone number, use '-h' for help!\n");
return 0;
} else if (!strcmp(argv[argi], "service")) {
bsa44_service(string);
} else {
number = argv[argi];
/* remove prefix, if given */
if (strlen(number) >= 10 && !strncmp(number, "0160", 4))
number += 4;
if (strlen(number) < 7 || strlen(number) > 8) {
fprintf(stderr, "Expecting phone number to be 7 or 8 digits, use '-h' for help!\n");
return 0;
}
for (i = 0; number[i]; i++) {
if (number[0] < '0' || number[i] > '9') {
fprintf(stderr, "Given phone number has invalid digits, use '-h' for help!\n");
return 0;
}
}
if (number[0] > '7') {
inval_number:
fprintf(stderr, "Given digits of phone number are out of range for 'C-Netz', use '-h' for help!\n");
return 0;
}
if (strlen(number) == 8) {
if ((number[1] - '0') * 10 + (number[2] - '0') > 31)
goto inval_number;
if (atoi(number + 3) > 65535)
goto inval_number;
} else {
if (atoi(number + 2) > 65535)
goto inval_number;
}
for (i = 0; sicherung[i]; i++) {
if (sicherung[0] < '0' || sicherung[i] > '9') {
fprintf(stderr, "Given security code has invalid digits, use '-h' for help!\n");
return 0;
}
}
if (!sicherung[0] || (sicherung[0] == '0' && sicherung[1] == '0') || atoi(sicherung) > 65535) {
fprintf(stderr, "Given security code is out of range, use '-h' for help!\n");
return 0;
}
cnetz_card(string, number, sicherung);
}
length = encode_track(data, string, CNETZ_LEAD_IN, CNETZ_LEAD_OUT);
if (length > (int)sizeof(data)) {
fprintf(stderr, "Software error: Array too small, PLEASE FIX!\n");
return -1;
}
/* alloc space depending on bit rate (length of half-bit: round up to next integer) */
int samples_per_halfbit = (dsp_samplerate + (baudrate * 2) - 1) / (baudrate * 2);
int total_samples = samples_per_halfbit * 2 * 5 * length;
sample_t sample[total_samples], *samples[1], silence[dsp_samplerate], level = 1;
#ifdef HAVE_ALSA
int switch_on_samples = samples_per_halfbit * 2 * 5 * (CNETZ_LEAD_IN + 21 + CNETZ_SWITCH_ON);
int switch_off_samples = samples_per_halfbit * 2 * 5 * (CNETZ_LEAD_IN + 21 + CNETZ_SWITCH_OFF);
int buffer_size = dsp_samplerate * dsp_buffer / 1000;
#endif
/* generate sample */
int s, ss = 0;
for (i = 0; i < length; i++) {
for (j = 0; j < 5; j++) {
level = -level;
for (s = 0; s < samples_per_halfbit; s++)
sample[ss++] = level;
if (((data[i] >> j) & 1))
level = -level;
for (s = 0; s < samples_per_halfbit; s++)
sample[ss++] = level;
}
}
memset(silence, 0, sizeof(silence));
PDEBUG(DDSP, DEBUG_INFO, "Total bits: %d\n", length * 5);
PDEBUG(DDSP, DEBUG_INFO, "Samples per bit: %d\n", samples_per_halfbit * 2);
PDEBUG(DDSP, DEBUG_INFO, "Total samples: %d (duration: %.3f seconds)\n", total_samples, (double)total_samples / (double)dsp_samplerate);
if (wave_file) {
wave_rec_t wave_rec;
/* open wave file */
rc = wave_create_record(&wave_rec, wave_file, dsp_samplerate, 1, 1.0);
if (rc < 0) {
PDEBUG(DRADIO, DEBUG_ERROR, "Failed to create WAVE record instance!\n");
goto error;
}
samples[0] = silence;
wave_write(&wave_rec, samples, dsp_samplerate / 2);
samples[0] = sample;
wave_write(&wave_rec, samples, total_samples);
samples[0] = silence;
wave_write(&wave_rec, samples, dsp_samplerate / 2);
wave_destroy_record(&wave_rec);
goto done;
}
#ifdef HAVE_ALSA
/* open audio device */
sound = sound_open(dsp_audiodev, NULL, NULL, NULL, 1, 0.0, dsp_samplerate, buffer_size, 1.0, 1.0, 0.0, 2.0);
if (!sound) {
rc = -EIO;
PDEBUG(DRADIO, DEBUG_ERROR, "Failed to open sound device!\n");
goto error;
}
#else
rc = -ENOTSUP;
PDEBUG(DRADIO, DEBUG_ERROR, "No sound card support compiled in!\n");
goto error;
#endif
print_aaimage();
printf("String to send: ;%s?\n", string);
for (i = 0; i < 5; i++) {
if (i < 4)
printf("2^%d: ...", i);
else
printf("Par: ...");
for (j = CNETZ_LEAD_IN - 4; j < CNETZ_LEAD_IN + 4 + 21; j++)
printf(" %d", (data[j] >> i) & 1);
printf(" ...\n");
}
/* catch signals */
signal(SIGINT, sighandler);
signal(SIGHUP, sighandler);
signal(SIGTERM, sighandler);
signal(SIGPIPE, sighandler);
#ifdef HAVE_ALSA
sound_start(sound);
int count;
while (!quit) {
ss = 0;
while (!quit) {
usleep(1000);
count = sound_get_tosend(sound, buffer_size);
if (count <= 0)
continue;
samples[0] = silence + ss;
ss += count;
if (ss > dsp_samplerate) {
count -= ss - dsp_samplerate;
ss = dsp_samplerate;
}
sound_write(sound, samples, NULL, count, NULL, NULL, 1);
if (ss == dsp_samplerate)
break;
}
printf("\033[0;32m -> \033[1;31mTX\033[0;32m <-\033[0;39m\r"); fflush(stdout);
ss = 0;
while (!quit) {
usleep(1000);
count = sound_get_tosend(sound, buffer_size);
if (count <= 0)
continue;
if ((ss >= 0 && ss < count) || (ss - switch_off_samples >= 0 && ss - switch_off_samples < count)) {
printf("\033[0;32m -> \033[1;31mTX\033[0;32m <- \033[0;39m\r"); fflush(stdout);
}
if (ss - switch_on_samples >= 0 && ss - switch_on_samples < count) {
printf("\033[0;32m -> \033[1;31mTX\033[0;32m <- -> \033[1;33mCLICK\033[0;32m <-\033[0;39m\r"); fflush(stdout);
}
samples[0] = sample + ss;
ss += count;
if (ss > total_samples) {
count -= ss - total_samples;
ss = total_samples;
}
sound_write(sound, samples, NULL, count, NULL, NULL, 1);
if (ss == total_samples)
break;
}
printf(" \r"); fflush(stdout);
}
#endif
/* reset signals */
signal(SIGINT, SIG_DFL);
signal(SIGHUP, SIG_DFL);
signal(SIGTERM, SIG_DFL);
signal(SIGPIPE, SIG_DFL);
error:
#ifdef HAVE_ALSA
if (sound)
sound_close(sound);
#endif
done:
options_free();
return 0;
}
#endif /* ARDUINO */