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/* GPS/AIS client extractor, forwad to gpsd via UDP
*
* (C) 2013 by Harald Welte <laforge@gnumonks.org>
* 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 2 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#include <syslog.h>
#include <stdint.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <libgsmd/libgsmd.h>
#include <libgsmd/event.h>
#include <gsmd/usock.h>
#include <gsmd/ts0705.h>
#include <common/linux_list.h>
#ifndef __GSMD__
#define __GSMD__
#include <gsmd/talloc.h>
#undef __GSMD__
#endif
static int out_fd = -1;
static FILE *outf;
static int celllog_main(struct lgsm_handle *lgsmh)
{
int rc;
char buf[8192+1];
fd_set readset;
int gsm_fd = lgsm_fd(lgsmh);
fcntl(gsm_fd, F_SETFD, O_NONBLOCK);
FD_ZERO(&readset);
while (1) {
fd_set readset;
FD_SET(gsm_fd, &readset);
rc = select(gsm_fd+1, &readset, NULL, NULL, NULL);
if (rc < 0)
break;
if (FD_ISSET(gsm_fd, &readset)) {
/* we've received something on the gsmd socket, pass it
* on to the library */
rc = read(gsm_fd, buf, sizeof(buf));
if (rc <= 0) {
syslog(LOG_ERR, "ERROR reading from gsm_fd\n");
break;
}
rc = lgsm_handle_packet(lgsmh, buf, rc);
if (rc < 0)
syslog(LOG_ERR, "ERROR processing packet: %d(%s)\n", rc, strerror(-rc));
}
fflush(outf);
}
return 0;
}
static int gps_handler(struct lgsm_handle *lh, int evt, struct gsmd_evt_auxdata *aux)
{
int rc;
rc = fprintf(outf, "%s\r\n", aux->data);
if (rc < 0) {
syslog(LOG_ERR, "error %d during fprintf() on socket, aborting\n", rc);
exit(3);
}
return 0;
}
/* more or less a copy form libosmocore, we could simply make this a
* dependency... */
static int out_sock_init(uint16_t family, uint16_t type, uint8_t proto,
const char *host, uint16_t port)
{
int fd = -1, rc;
struct addrinfo hints, *result, *rp;
char portbuf[16];
sprintf(portbuf, "%u", port);
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = family;
rc = getaddrinfo(host, portbuf, &hints, &result);
if (rc != 0) {
syslog(LOG_ERR, "Error during getaddrinfo(%s:%d)\n",
host, port);
return -EINVAL;
}
for (rp = result; rp != NULL; rp = rp->ai_next) {
fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
if (fd < 0)
continue;
rc = connect(fd, rp->ai_addr, rp->ai_addrlen);
if (rc != -1 || (rc == -1 && errno == EINPROGRESS))
break;
close(fd);
}
freeaddrinfo(result);
if (rp == NULL) {
syslog(LOG_ERR, "unable to connect socket\n");
return -ENODEV;
}
return fd;
}
int main(int argc, char **argv)
{
static struct lgsm_handle *lgsmh;
char *host;
int port;
int rc;
printf("gps_fwd - (C) 2013 by Harald Welte <laforge@gnumonks.org>.\n"
"This program is Free Software and has ABSOLUTELY NO WARRANTY\n\n");
if (argc < 3) {
fprintf(stderr, "You have to specify the remote hostname + port\n");
exit(2);
}
host = argv[1];
port = atoi(argv[2]);
openlog("gps_fwd", 0, LOG_LOCAL0);
lgsmh = lgsm_init(LGSMD_DEVICE_GSMD);
if (!lgsmh) {
fprintf(stderr, "Can't connect to gsmd\n");
exit(1);
}
lgsm_evt_handler_register(lgsmh, GSMD_EVT_GPS, &gps_handler);
lgsm_evt_handler_register(lgsmh, GSMD_EVT_AIS, &gps_handler);
out_fd = out_sock_init(AF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP, host, port);
if (out_fd < 0)
exit(1);
outf = fdopen(out_fd, "w");
celllog_main(lgsmh);
exit(0);
}
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