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aprs.fi.toudp.c
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aprs.fi.toudp.c
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/* aprs.fi.toudp.c v1.0 by [email protected] 2015.12.19
connect to asia.aprs2.net. tcp 14580 port, login filter p/B p/VR2
send all packets to udp host in file "/usr/src/arps/aprs.fi.udpdest"
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <linux/if.h>
#include <linux/if_ether.h>
#include <linux/if_packet.h>
#include "sock.h"
#include <ctype.h>
#define MAXLEN 16384
// #define DEBUG 1
#define PORT 14580
int r_fd;
void sendudp(char *buf, int len, char *host, int port)
{
struct sockaddr_in si_other;
int s, slen = sizeof(si_other);
int l;
#ifdef DEBUG
fprintf(stderr, "send to %s,", host);
#endif
if ((s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1) {
fprintf(stderr, "socket error");
return;
}
memset((char *)&si_other, 0, sizeof(si_other));
si_other.sin_family = AF_INET;
si_other.sin_port = htons(port);
if (inet_aton(host, &si_other.sin_addr) == 0) {
fprintf(stderr, "inet_aton() failed\n");
close(s);
return;
}
l = sendto(s, buf, len, 0, (const struct sockaddr *)&si_other, slen);
#ifdef DEBUG
fprintf(stderr, "%d\n", l);
#endif
close(s);
}
void relayaprs(char *buf, int len)
{
FILE *fp;
if (strstr(buf, "-13>"))
sendudp(buf, len, "114.55.54.60", 14580); // forward -13 to lewei50.com
fp = fopen("/usr/src/aprs/aprs.fi.udpdest", "r");
if (fp == NULL) {
fprintf(stderr, "open host error\n");
return;
}
char hbuf[MAXLEN];
while (fgets(hbuf, MAXLEN, fp)) {
char *p;
if (strlen(hbuf) < 5)
continue;
if (hbuf[strlen(hbuf) - 1] == '\n')
hbuf[strlen(hbuf) - 1] = 0;
p = strchr(hbuf, ':');
if (p) {
*p = 0;
p++;
sendudp(buf, len, hbuf, atoi(p));
} else
sendudp(buf, len, hbuf, PORT);
}
fclose(fp);
}
#include "passcode.c"
void Process(char *server, char *call)
{
char buffer[MAXLEN];
int n;
int optval;
socklen_t optlen = sizeof(optval);
r_fd = Tcp_connect(server, "14580");
optval = 1;
Setsockopt(r_fd, SOL_SOCKET, SO_KEEPALIVE, &optval, optlen);
optval = 3;
Setsockopt(r_fd, SOL_TCP, TCP_KEEPCNT, &optval, optlen);
optval = 2;
Setsockopt(r_fd, SOL_TCP, TCP_KEEPIDLE, &optval, optlen);
optval = 2;
Setsockopt(r_fd, SOL_TCP, TCP_KEEPINTVL, &optval, optlen);
snprintf(buffer, MAXLEN, "user %s pass %d vers aprs.fi.toudp 1.5 filter p/B p/VR2\r\n", call, passcode(call));
Write(r_fd, buffer, strlen(buffer));
while (1) {
n = Readline(r_fd, buffer, MAXLEN);
if (n <= 0) {
exit(0);
}
if (buffer[0] == '#')
continue;
buffer[n] = 0;
relayaprs(buffer, n);
}
}
void usage()
{
printf("\naprs.fi.toudp v1.0 - aprs relay by [email protected]\n");
printf("\naprs.fi.toudp [ x.x.x.x CALL ]\n\n");
exit(0);
}
int main(int argc, char *argv[])
{
char *call = "BG6CQ-5";
char *server = "asia.aprs2.net";
signal(SIGCHLD, SIG_IGN);
if (argc == 3) {
server = argv[1];
call = argv[2];
} else if (argc != 1) {
usage();
exit(0);
}
#ifndef DEBUG
daemon_init("aprs.fi.toudp", LOG_DAEMON);
while (1) {
int pid;
pid = fork();
if (pid == 0) // i am child, will do the job
break;
else if (pid == -1) // error
exit(0);
else
wait(NULL); // i am parent, wait for child
sleep(2); // if child exit, wait 2 second, and rerun
}
#endif
Process(server, call);
return (0);
}