/*	$NetBSD: sprayd.c,v 1.18 2011/09/16 16:13:17 plunky Exp $	*/

/*
 * Copyright (c) 1994 Christos Zoulas
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: sprayd.c,v 1.18 2011/09/16 16:13:17 plunky Exp $");
#endif /* not lint */

#include <stdio.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include <syslog.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <rpc/rpc.h>
#include <rpcsvc/spray.h>

__dead static void cleanup(int);
__dead static void die(int);
static void spray_service(struct svc_req *, SVCXPRT *);

static int from_inetd = 1;

#define TIMEOUT 120

static void
cleanup(int n)
{

	(void)rpcb_unset(SPRAYPROG, SPRAYVERS, NULL);
	exit(0);
}

static void
die(int n)
{

	exit(0);
}

int
main(int argc, char *argv[])
{
	SVCXPRT *transp;
	struct sockaddr_storage from;
	socklen_t fromlen;

	/*
	 * See if inetd started us
	 */
	fromlen = sizeof(from);
	if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0)
		from_inetd = 0;

	if (!from_inetd) {
		daemon(0, 0);

		(void)rpcb_unset(SPRAYPROG, SPRAYVERS, NULL);

		(void)signal(SIGINT, cleanup);
		(void)signal(SIGTERM, cleanup);
		(void)signal(SIGHUP, cleanup);
	} else {
		(void)signal(SIGALRM, die);
		alarm(TIMEOUT);
	}

	openlog("rpc.sprayd", LOG_PID, LOG_DAEMON);

	if (from_inetd) {
		transp = svc_dg_create(0, 0, 0);
		if (transp == NULL) {
			syslog(LOG_ERR, "cannot create udp service.");
			exit(1);
		}
		if (!svc_reg(transp, SPRAYPROG, SPRAYVERS, spray_service,
		    NULL)) {
			syslog(LOG_ERR,
			    "unable to register (SPRAYPROG, SPRAYVERS).");
			exit(1);
		}
	} else {
		if (!svc_create(spray_service, SPRAYPROG, SPRAYVERS, "udp")) {
			syslog(LOG_ERR,
			    "unable to register (SPRAYPROG, SPRAYVERS).");
			exit(1);
		}
	}

	svc_run();
	syslog(LOG_ERR, "svc_run returned");
	exit(1);
}


static void
spray_service(struct svc_req *rqstp, SVCXPRT *transp)
{
	static spraycumul scum;
	static struct timeval clear, get;

	switch (rqstp->rq_proc) {
	case SPRAYPROC_CLEAR:
		scum.counter = 0;
		(void)gettimeofday(&clear, 0);
		/*FALLTHROUGH*/

	case NULLPROC:
		(void)svc_sendreply(transp, (xdrproc_t)xdr_void, NULL);
		return;

	case SPRAYPROC_SPRAY:
		scum.counter++;
		return;

	case SPRAYPROC_GET:
		(void)gettimeofday(&get, 0);
		timersub(&get, &clear, &get);
		scum.clock.sec = get.tv_sec;
		scum.clock.usec = get.tv_usec;
		break;

	default:
		svcerr_noproc(transp);
		return;
	}

	if (!svc_sendreply(transp, (xdrproc_t)xdr_spraycumul, (caddr_t)&scum)) {
		svcerr_systemerr(transp);
		syslog(LOG_WARNING, "bad svc_sendreply");
	}
}