/*      $NetBSD: sprayd.c,v 1.15 2009/10/21 01:07:46 snj Exp $  */

/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * 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 <rpc/rpc.h>
#include <rpcsvc/spray.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <syslog.h>
#include <unistd.h>

static void spray_service(struct svc_req *, SVCXPRT *);

static int from_inetd = 1;

#define timersub(tvp, uvp, vvp)                                         \
        do {                                                            \
                (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec;          \
                (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec;       \
                if ((vvp)->tv_usec < 0) {                               \
                        (vvp)->tv_sec--;                                \
                        (vvp)->tv_usec += 1000000;                      \
                }                                                       \
        } while (0)

#define TIMEOUT 120

static void
cleanup(int sig __unused)
{
        (void)rpcb_unset(SPRAYPROG, SPRAYVERS, NULL);
        exit(0);
}

static void
die(int sig __unused)
{
        exit(0);
}

int
main(int argc __unused, char *argv[] __unused)
{
        SVCXPRT *transp;
        int ok;
        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_tli_create(0, NULL, NULL, 0, 0);
                if (transp == NULL) {
                        syslog(LOG_ERR, "cannot create udp service.");
                        exit(1);
                }
                ok = svc_reg(transp, SPRAYPROG, SPRAYVERS,
                             spray_service, NULL);
        } else
                ok = svc_create(spray_service,
                                SPRAYPROG, SPRAYVERS, "udp");
        if (!ok) {
                syslog(LOG_ERR,
                    "unable to register (SPRAYPROG, SPRAYVERS, %s)",
                    (!from_inetd)?"udp":"(inetd)");
                exit(1);
        }

        svc_run();
        syslog(LOG_ERR, "svc_run returned");
        return 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, &scum)) {
                svcerr_systemerr(transp);
                syslog(LOG_WARNING, "bad svc_sendreply");
        }
}