/*      $OpenBSD: rup.c,v 1.31 2017/03/20 16:10:10 deraadt Exp $        */

/*-
 * 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. The name of the author may not 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.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys/socket.h>
#include <netdb.h>
#include <rpc/rpc.h>
#include <rpc/pmap_clnt.h>
#include <arpa/inet.h>
#include <err.h>
#include <unistd.h>

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

#define HOST_WIDTH 27

int printtime;                  /* print the remote host(s)'s time */

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

void usage(void);
int print_rup_data(char *, statstime *host_stat);

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

        if (!hosts)
                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)))) {
                err(1, NULL);
                /* NOTREACHED */
        }
        hp->addr.s_addr = addr.s_addr;
        hp->next = hosts;
        hosts = hp;
}


struct rup_data {
        char *host;
        struct statstime statstime;
};
struct rup_data *rup_data;
int rup_data_idx = 0;
int rup_data_max = 0;

enum sort_type {
        SORT_NONE,
        SORT_HOST,
        SORT_LDAV,
        SORT_UPTIME
};
enum sort_type sort_type;

static int
compare(const void *v1, const void *v2)
{
        const struct rup_data *d1 = v1;
        const struct rup_data *d2 = v2;

        switch(sort_type) {
        case SORT_HOST:
                return strcmp(d1->host, d2->host);
        case SORT_LDAV:
                return d1->statstime.avenrun[0]
                        - d2->statstime.avenrun[0];
        case SORT_UPTIME:
                return d1->statstime.boottime.tv_sec
                        - d2->statstime.boottime.tv_sec;
        default:
                /* something's really wrong here */
                abort();
        }
}

static void
remember_rup_data(char *host, struct statstime *st)
{
        if (rup_data_idx >= rup_data_max) {
                int newsize;
                struct rup_data *newrup;

                newsize = rup_data_max + 16;
                newrup = recallocarray(rup_data, rup_data_max, newsize,
                    sizeof(struct rup_data));
                if (newrup == NULL) {
                        err(1, NULL);
                        /* NOTREACHED */
                }
                rup_data = newrup;
                rup_data_max = newsize;
        }

        if ((rup_data[rup_data_idx].host = strdup(host)) == NULL)
                err(1, NULL);
        rup_data[rup_data_idx].statstime = *st;
        rup_data_idx++;
}


static int
rstat_reply(char *replyp, struct sockaddr_in *raddrp)
{
        struct hostent *hp;
        char *host;
        statstime *host_stat = (statstime *)replyp;

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

                remember_host(raddrp->sin_addr);

                if (sort_type != SORT_NONE)
                        remember_rup_data(host, host_stat);
                else
                        print_rup_data(host, host_stat);
        }

        return (0);
}


int
print_rup_data(char *host, statstime *host_stat)
{
        unsigned int ups = 0, upm = 0, uph = 0, upd = 0;
        struct tm *tmp_time, host_time;
        char days_buf[16], hours_buf[16];
        time_t tim;

        if (printtime)
                printf("%-*.*s", HOST_WIDTH-8, HOST_WIDTH-8, host);
        else
                printf("%-*.*s", HOST_WIDTH, HOST_WIDTH, host);

        tim = host_stat->curtime.tv_sec;
        tmp_time = localtime(&tim);
        host_time = *tmp_time;

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

        if (host_stat->curtime.tv_sec > 0)
                ups = host_stat->curtime.tv_sec;
        upd = ups / (3600 * 24);
        ups -= upd * 3600 * 24;
        uph = ups / 3600;
        ups -= uph * 3600;
        upm = ups / 60;

        if (upd != 0)
                snprintf(days_buf, sizeof days_buf, "%3u day%s, ", upd,
                    (upd > 1) ? "s" : "");
        else
                days_buf[0] = '\0';

        if (uph != 0)
                snprintf(hours_buf, sizeof hours_buf, "%2u:%02u, ",
                    uph, upm);
        else
                if (upm != 0)
                        snprintf(hours_buf, sizeof hours_buf, "%2u min%s ",
                            upm, (upm == 1) ? ", " : "s,");
                else
                        hours_buf[0] = '\0';

        if (printtime)
                printf(" %2d:%02d%cm",
                    (host_time.tm_hour % 12) ? (host_time.tm_hour % 12) : 12,
                    host_time.tm_min,
                    (host_time.tm_hour >= 12) ? 'p' : 'a');

        printf(" up %9.9s%9.9s load average: %.2f %.2f %.2f\n",
            days_buf, hours_buf,
            (double)host_stat->avenrun[0] / FSCALE,
            (double)host_stat->avenrun[1] / FSCALE,
            (double)host_stat->avenrun[2] / FSCALE);

        return(0);
}


static void
onehost(char *host)
{
        CLIENT *rstat_clnt;
        statstime host_stat;
        static struct timeval timeout = {25, 0};
        extern char *__progname;

        rstat_clnt = clnt_create(host, RSTATPROG, RSTATVERS_TIME, "udp");
        if (rstat_clnt == NULL) {
                fprintf(stderr, "%s: %s", __progname,
                    clnt_spcreateerror(host));
                return;
        }

        bzero((char *)&host_stat, sizeof(host_stat));
        if (clnt_call(rstat_clnt, RSTATPROC_STATS, xdr_void, NULL,
            xdr_statstime, &host_stat, timeout) != RPC_SUCCESS) {
                fprintf(stderr, "%s: %s", __progname,
                    clnt_sperror(rstat_clnt, host));
                clnt_destroy(rstat_clnt);
                return;
        }

        if (sort_type != SORT_NONE)
                remember_rup_data(host, &host_stat);
        else
                print_rup_data(host, &host_stat);

        clnt_destroy(rstat_clnt);
}

static void
allhosts(void)
{
        statstime host_stat;
        enum clnt_stat clnt_stat;
        extern char *__progname;

        if (sort_type != SORT_NONE) {
                printf("collecting responses...\n");
                fflush(stdout);
        }

        clnt_stat = clnt_broadcast(RSTATPROG, RSTATVERS_TIME, RSTATPROC_STATS,
            xdr_void, NULL, xdr_statstime, (char *)&host_stat, rstat_reply);
        if (clnt_stat != RPC_SUCCESS && clnt_stat != RPC_TIMEDOUT) {
                fprintf(stderr, "%s: %s\n", __progname, clnt_sperrno(clnt_stat));
                exit(1);
        }
}

int
main(int argc, char *argv[])
{
        int ch;
        size_t i;
        extern int optind;

        sort_type = SORT_NONE;
        while ((ch = getopt(argc, argv, "dhlt")) != -1)
                switch (ch) {
                case 'd':
                        printtime = 1;
                        break;
                case 'h':
                        sort_type = SORT_HOST;
                        break;
                case 'l':
                        sort_type = SORT_LDAV;
                        break;
                case 't':
                        sort_type = SORT_UPTIME;
                        break;
                default:
                        usage();
                        /*NOTREACHED*/
                }

        setvbuf(stdout, NULL, _IOLBF, 0);

        if (argc == optind)
                allhosts();
        else {
                for (; optind < argc; optind++)
                        onehost(argv[optind]);
        }

        if (sort_type != SORT_NONE) {
                qsort(rup_data, rup_data_idx, sizeof(struct rup_data),
                    compare);

                for (i = 0; i < rup_data_idx; i++) {
                        print_rup_data(rup_data[i].host,
                            &rup_data[i].statstime);
                }
        }

        exit(0);
}


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