/*-
 * Copyright (c) 1993, John Brezak
 * 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.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 *
 * $FreeBSD: src/usr.bin/rup/rup.c,v 1.19 2005/12/04 18:25:26 philip Exp $
 * $DragonFly: src/usr.bin/rup/rup.c,v 1.5 2005/08/04 18:21:25 liamfoy Exp $
 */
#include <sys/param.h>
#include <sys/socket.h>

#include <arpa/inet.h>
#include <rpc/rpc.h>
#include <rpc/pmap_clnt.h>
#undef FSHIFT                   /* Use protocol's shift and scale values */
#undef FSCALE
#include <rpcsvc/rstat.h>

#include <err.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#define HOST_WIDTH 15

struct host_list {
        struct host_list *next;
        struct in_addr addr;
} *hosts;

static int
search_host(struct in_addr addr)
{
        struct host_list *hp;

        if (hosts == NULL)
                return(0);

        for (hp = hosts; hp != NULL; hp = hp->next) {
                if (hp->addr.s_addr == addr.s_addr)
                        return(1);
        }
        return(0);
}

static void
remember_host(struct in_addr addr)
{
        struct host_list *hp;

        if ((hp = malloc(sizeof(struct host_list))) == NULL)
                err(1, "malloc failed");
        hp->addr.s_addr = addr.s_addr;
        hp->next = hosts;
        hosts = hp;
}

static bool_t
rstat_reply(caddr_t replyp, struct sockaddr_in *raddrp)
{
        struct tm *tmp_time;
        struct tm host_time;
        struct tm host_uptime;
        char days_buf[16];
        char hours_buf[16];
        struct hostent *hp;
        char *host;
        statstime *host_stat = (statstime *)replyp;
        time_t tmp_time_t;

        if (search_host(raddrp->sin_addr))
                return(0);

        hp = gethostbyaddr(&raddrp->sin_addr.s_addr, sizeof(struct in_addr),
                           AF_INET);
        if (hp)
                host = hp->h_name;
        else
                host = inet_ntoa(raddrp->sin_addr);

        /* truncate hostname to fit nicely into field */
        if (strlen(host) > HOST_WIDTH)
                host[HOST_WIDTH] = '\0';

        printf("%-*s\t", HOST_WIDTH, host);

        if (sizeof(time_t) == sizeof(host_stat->curtime.tv_sec)) {
                tmp_time = localtime((time_t *)&host_stat->curtime.tv_sec);
                host_time = *tmp_time;

                host_stat->curtime.tv_sec -= host_stat->boottime.tv_sec;

                tmp_time = gmtime((time_t *)&host_stat->curtime.tv_sec);
                host_uptime = *tmp_time;
        }
        else {                  /* non-32-bit time_t */
                tmp_time_t = host_stat->curtime.tv_sec;
                tmp_time = localtime(&tmp_time_t);
                host_time = *tmp_time;

                host_stat->curtime.tv_sec -= host_stat->boottime.tv_sec;

                tmp_time_t = host_stat->curtime.tv_sec;
                tmp_time = gmtime(&tmp_time_t);
                host_uptime = *tmp_time;
        }

        #define updays (host_stat->curtime.tv_sec  / 86400)
        if (host_uptime.tm_yday != 0)
                snprintf(days_buf, sizeof days_buf, "%3d day%s, ", updays,
                        (updays > 1) ? "s" : "");
        else
                days_buf[0] = '\0';

        if (host_uptime.tm_hour != 0)
                snprintf(hours_buf, sizeof hours_buf, "%2d:%02d, ",
                        host_uptime.tm_hour, host_uptime.tm_min);
        else if (host_uptime.tm_min != 0)
                snprintf(hours_buf, sizeof hours_buf, "%2d mins, ",
                         host_uptime.tm_min);
        else if (host_stat->curtime.tv_sec < 60)
                snprintf(hours_buf, sizeof hours_buf, "%2d secs, ",
                         host_uptime.tm_sec);
        else
                hours_buf[0] = '\0';

        printf(" %2d:%02d%cm  up %9.9s%9.9s load average: %.2f %.2f %.2f\n",
                (host_time.tm_hour % 12) ? host_time.tm_hour % 12 : 12,
                host_time.tm_min,
                (host_time.tm_hour >= 12) ? 'p' : 'a',
                days_buf,
                hours_buf,
                (double)host_stat->avenrun[0]/FSCALE,
                (double)host_stat->avenrun[1]/FSCALE,
                (double)host_stat->avenrun[2]/FSCALE);

        remember_host(raddrp->sin_addr);
        return(0);
}

static int
onehost(const char *host)
{
        CLIENT *rstat_clnt;
        statstime host_stat;
        struct sockaddr_in addr;
        struct hostent *hp;
        struct timeval tv;

        hp = gethostbyname(host);
        if (hp == NULL) {
                herror("rup");
                return(1);
        }

        rstat_clnt = clnt_create(host, RSTATPROG, RSTATVERS_TIME, "udp");
        if (rstat_clnt == NULL) {
                clnt_pcreateerror(host);
                return(1);
        }

        bzero(&host_stat, sizeof(host_stat));
        tv.tv_sec = 15; /* XXX ??? */
        tv.tv_usec = 0;
        if (clnt_call(rstat_clnt, RSTATPROC_STATS, (xdrproc_t)xdr_void, NULL,
            (xdrproc_t)xdr_statstime, &host_stat, tv) != RPC_SUCCESS) {
                clnt_perror(rstat_clnt, host);
                clnt_destroy(rstat_clnt);
                return(1);
        }

        addr.sin_addr.s_addr = *(int *)hp->h_addr;
        rstat_reply((caddr_t)&host_stat, &addr);
        clnt_destroy(rstat_clnt);
        return (0);
}

static void
allhosts(void)
{
        statstime host_stat;
        enum clnt_stat clnt_stat;

        clnt_stat = clnt_broadcast(RSTATPROG, RSTATVERS_TIME, RSTATPROC_STATS,
                                   (xdrproc_t)xdr_void, NULL,
                                   (xdrproc_t)xdr_statstime, &host_stat,
                                   (resultproc_t)rstat_reply);
        if (clnt_stat != RPC_SUCCESS && clnt_stat != RPC_TIMEDOUT)
                errx(1, "%s", clnt_sperrno(clnt_stat));
}

static void
usage(void)
{
        fprintf(stderr, "usage: rup [host ...]\n");
        exit(1);
}

int
main(int argc, char *argv[])
{
        int ch, retval;

        retval = 0;
        while ((ch = getopt(argc, argv, "")) != -1)
                switch (ch) {
                default:
                        usage();
                        /*NOTREACHED*/
                }

        setlinebuf(stdout);
        if (argc == optind)
                allhosts();
        else {
                for (; optind < argc; optind++)
                        retval += onehost(argv[optind]);
        }
        exit(retval ? 1 : 0);
}