/*

The Very Easy Udp Listener vor HIPradio.

Koos van den Hout, Remco van Mook, Juli 1997

compiling :

Linux
gcc -o -O2 hipclient hipclient.c

Solaris
gcc -o -O2 hipclient hipclient.c -linet

Others
Unknown as of yet

*/

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <stdio.h>

int main(int argc, char **argv){

	struct sockaddr_in recaddr;
	struct sockaddr_in frmaddr;
	struct in_addr checkaddr;
	int frmlen;
	unsigned char udpbuf[1500];
	int udpsocket;
	int length;

	udpsocket=socket(AF_INET,SOCK_DGRAM,getprotobyname("udp")->p_proto);
	recaddr.sin_family=AF_INET;
	recaddr.sin_port=htons(8997);
	recaddr.sin_addr.s_addr = INADDR_ANY;
	if (bind(udpsocket,(struct sockaddr *)&recaddr,sizeof(recaddr))<0){
		perror("bind");
	}
	frmlen=sizeof(frmaddr);
	length=recvfrom(udpsocket,udpbuf,1500,0,(struct sockaddr *)&frmaddr,&frmlen);
	fprintf(stderr,"====== HIPnet radio : source address %s ======\n",inet_ntoa(frmaddr.sin_addr));
	checkaddr=frmaddr.sin_addr;
	write(1,udpbuf,length);

	while (1){
		length=recvfrom(udpsocket,udpbuf,1500,0,(struct sockaddr *)&frmaddr,&frmlen);
		if (memcmp(&checkaddr,&frmaddr.sin_addr,sizeof(struct in_addr))==0) write(1,udpbuf,length);
	}

	return 0;
}