/*	@(#)tcpd.c	1.6 2003/12/29 Connectathon Testsuite	*/
/*
 *  server for simple tcp ping program.
 *  listens on socket for connection request, then echos back
 *  request from client.
 */
#define TCP_PORT        3456

#include <stdio.h>
#include <stdlib.h>
#include <unistd.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, ns;			/* sockets */
	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_STREAM, IPPROTO_TCP)) < 0)
		xxit("socket");

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

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

	if (listen(s, 5) < 0)
		xxit("listen");

	while(1) {
		fprintf(stderr, "%s awaiting accept\n", argv[0]);
		addrlen = sizeof(struct sockaddr_in);
		if ((ns = accept(s, (struct sockaddr *)&addr, &addrlen)) < 0)
			xxit("accept");
#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 connection from host %s\n", argv[0], hp->h_name);
		else
			fprintf(stderr, "\
%s: accepted connection from host %x\n", argv[0], addr.sin_addr.s_addr);

		ret = read(ns, buf, BUFSIZ);
		fprintf(stderr, " read ret %d\n", ret);
		if (ret > 0) {
			*buf = *buf + 1;
			ret = write(ns, buf, ret);
			fprintf(stderr, " write ret %d\n", ret);
		}
		sleep(5);
		close(ns);
	}
}