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beast_tcp.c
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beast_tcp.c
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/*
* beast_tcp.c -- Implement the ADS-B BEAST protocol over TCP
* Author: Michael J. Tubby B.Sc. MIET [email protected]
*
* ABSTRACT
*
* Make a TCP/IP connection to the BEAST protocol on localhost:30005 from Dump1090
* and it's friends and parse frames de-escaping them.
*
* Look for message type 0x33 which is RSSI + MLAT + Extended Squitter and pass
* these up to radar_send() for forwarding to the aggregator.
*
*/
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/select.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <errno.h>
#include <arpa/inet.h>
#include <sys/time.h>
#include <errno.h>
#include "radar.h"
#include "defs.h"
#include "beast.h"
#include "beast_tcp.h"
#include "telemetry.h"
#include "hex.h"
#include "xtimer.h"
#include "qerror.h"
/*
* external variables
*/
extern int debug;
/*
* local variables
*/
static enum beaststate constate;
static int fd;
static char hostname[HOSTNAME_LEN+1];
static struct sockaddr_in saddr;
static xtimer_t beast_retry;
/*
* chgconstate() - change connection state with optional debugging
*/
static void chgconstate(enum beaststate newstate)
{
if (debug > 1)
printf("chgconstate(): %d -> %d\n", constate, newstate);
constate = newstate;
}
/*
* connect_socket() - attempt to make a TCP connection
*/
static int connect_socket(void)
{
struct hostent *hostinfo;
fd = socket(AF_INET, SOCK_STREAM, 0);
if (fd < 0)
qerror("connect_socket(): Could not create socket\n");
memset(&saddr, 0, sizeof(saddr));
saddr.sin_family = AF_INET;
saddr.sin_port = htons(BEAST_TCP_PORT);
hostinfo = gethostbyname(hostname);
if (hostinfo != NULL) {
memcpy(&saddr.sin_addr.s_addr, hostinfo->h_addr, hostinfo->h_length);
if (connect(fd, (struct sockaddr *)&saddr, sizeof(saddr)) >= 0) {
++telemetry.connect_success;
return 1;
} else {
++telemetry.connect_fail;
return 0;
}
}
return 0;
}
/*
* beast_tcp_init() - initialise BEAST conenction over TCP
*/
void beast_tcp_init(char *addr)
{
memset(&stats, 0, sizeof(stats_t));
chgconstate(0);
beast_init();
strncpy(hostname, addr, HOSTNAME_LEN);
chgconstate(BEAST_TCP_DISCONNECTED);
}
/*
* beast_close() - shutdown the BEAST
*/
void beast_tcp_close(void)
{
if (fd) {
int rc = close(fd);
if (rc < 0) {
qerror("beast_close(): error calling close(): %s (%d)\n", strerror(errno), errno);
}
fd = 0;
}
}
/*
* beast_tcp_run() - run the BEAST protocol connection
*/
void beast_tcp_run(void)
{
fd_set set;
struct timeval timeout;
static uint8_t buf[BEAST_MAX_READ];
int size, rc;
switch (constate) {
case BEAST_TCP_DISCONNECTED:
if (connect_socket()) {
/* connection success */
chgconstate(BEAST_TCP_CONNECTED);
xtimer_stop(&beast_retry);
} else {
/* connect failed */
close(fd);
xtimer_start(&beast_retry, BEAST_RETRY);
chgconstate(BEAST_TCP_RETRY_WAIT);
}
break;
case BEAST_TCP_CONNECTED:
{
FD_ZERO(&set);
FD_SET(fd, &set);
timeout.tv_sec = 0;
timeout.tv_usec = BEAST_SELECT_TIMEOUT;
rc = select(fd+1, &set, NULL, NULL, &timeout);
if (rc < 0) {
/* error on connection */
close(fd);
xtimer_start(&beast_retry, BEAST_RETRY);
chgconstate(BEAST_TCP_RETRY_WAIT);
++telemetry.socket_error;
} else if (rc == 0) {
/* timeout no data*/
;
} else {
/* data available or connection closed - do a read */
size = read(fd, buf, sizeof(buf));
if (size > 0) {
/* we have some data - call beast common input handler to decode */
beast_process_input(buf, size);
} else {
/* size is zero -> connection closed */
close(fd);
xtimer_start(&beast_retry, BEAST_RETRY);
chgconstate(BEAST_TCP_RETRY_WAIT);
++telemetry.disconnect;
}
}
}
break;
case BEAST_TCP_RETRY_WAIT:
usleep(1000000); /* wait 100mS before polling timer */
if (xtimer_expired(&beast_retry)) {
/* when the timer expires try to connect again */
chgconstate(BEAST_TCP_DISCONNECTED);
}
break;
}
}