/*	@(#)udpd.c	1.6 2003/12/29 Connectathon Testsuite	*/
/*
 *  server for simple udp ping program.
 *  listens on socket for request, then echos back
 *  request from client.
 */
#define UDP_PORT        3457

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

static void
xxit(s)
	char *s;
{
	perror(s);
	exit(1);
}

/*ARGSUSED*/
int
main(argc, argv)
	int argc;
	char **argv;
{
	int s;				/* socket */
	struct sockaddr_in addr;	/* socket address */
	int ret;
#ifdef HAVE_SOCKLEN_T
	socklen_t addrlen = sizeof(struct sockaddr_in);
#else
	size_t addrlen = sizeof(struct sockaddr_in);
#endif
	struct hostent *hp;
	char buf[BUFSIZ];

	if ((s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
		xxit("socket");

	addr.sin_family = AF_INET;
	addr.sin_port = htons(UDP_PORT);
	addr.sin_addr.s_addr = INADDR_ANY;

	if (bind(s, (struct sockaddr *)&addr, addrlen) < 0)
		xxit("bind");

	while(1) {
		fprintf(stderr, "%s awaiting request\n", argv[0]);
		addrlen = sizeof(struct sockaddr_in);
		ret = recvfrom(s, buf, BUFSIZ, 0, (struct sockaddr *)&addr,
			       &addrlen);
		if (ret < 0)
			xxit("recvfrom");
#ifdef __STDC__
		if (hp = gethostbyaddr((const char *)&addr.sin_addr,
					sizeof(addr.sin_addr), AF_INET))
#else
		if (hp = gethostbyaddr(&addr.sin_addr, sizeof(addr.sin_addr),
					AF_INET))
#endif
			fprintf(stderr, "\
%s: accepted request from host %s\n", argv[0], hp->h_name);
		else
			fprintf(stderr, "\
%s: accepted request from host %x\n", argv[0], addr.sin_addr.s_addr);

		fprintf(stderr, " recvfrom ret %d\n", ret);
		if (ret > 0) {
			*buf = *buf + 1;
			ret = sendto(s, buf, ret, 0, (struct sockaddr *)&addr,
				     addrlen);
			fprintf(stderr, " sendto ret %d\n", ret);
		}
	}
}