/*      $NetBSD: rup.c,v 1.29 2016/09/05 00:40:29 sevan 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. 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.
 */

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: rup.c,v 1.29 2016/09/05 00:40:29 sevan Exp $");
#endif /* not lint */

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

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

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

#define HOST_WIDTH 24

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

static struct host_list {
        struct host_list *next;
        int family;
        union {
                struct in6_addr _addr6;
                struct in_addr _addr4;
        } addr;
} *hosts;

#define addr6 addr._addr6
#define addr4 addr._addr4

static int search_host(struct sockaddr *);
static void remember_host(struct sockaddr *);

static int
search_host(struct sockaddr *sa)
{
        struct host_list *hp;
        
        if (!hosts)
                return 0;

        for (hp = hosts; hp != NULL; hp = hp->next) {
                switch (hp->family) {
                case AF_INET6:
                        if (!memcmp(&hp->addr6,
                            &((struct sockaddr_in6 *)(void *)sa)->sin6_addr,
                            sizeof (struct in6_addr)))
                                return 1;
                        break;
                case AF_INET:
                        if (!memcmp(&hp->addr4,
                            &((struct sockaddr_in *)(void *)sa)->sin_addr,
                            sizeof (struct in_addr)))
                                return 1;
                        break;
                default:
                        break;
                }
        }
        return 0;
}

static void
remember_host(struct sockaddr *sa)
{
        struct host_list *hp;

        if ((hp = malloc(sizeof(struct host_list))) == NULL) {
                err(1, "malloc");
                /* NOTREACHED */
        }
        hp->family = sa->sa_family;
        hp->next = hosts;
        switch (sa->sa_family) {
        case AF_INET6:
                (void)memcpy(&hp->addr6,
                    &((struct sockaddr_in6 *)(void *)sa)->sin6_addr,
                    sizeof (struct in6_addr));
                break;
        case AF_INET:
                (void)memcpy(&hp->addr4,
                    &((struct sockaddr_in *)(void *)sa)->sin_addr,
                    sizeof (struct in_addr));
                break;
        default:
                errx(1, "unknown address family");
                /* NOTREACHED */
        }
        hosts = hp;
}

struct rup_data {
        const char *host;
        struct statstime statstime;
};
static struct rup_data *rup_data;
static size_t rup_data_idx = 0;
static size_t rup_data_max = 0;

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

static int compare(struct rup_data *, struct rup_data *);
static void remember_rup_data(const char *, struct statstime *);
static int rstat_reply(char *, struct netbuf *, struct netconfig *);
static void print_rup_data(const char *, statstime *);
static int onehost(char *);
static void allhosts(void);
static void usage(void) __dead;

int
compare(struct rup_data *d1, struct rup_data *d2)
{
        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();
                /*NOTREACHED*/
        }
}

static void
remember_rup_data(const char *host, struct statstime *st)
{
        struct rup_data *n;

        if (rup_data_idx >= rup_data_max) {
                n = realloc(rup_data,
                    (rup_data_max + 16) * sizeof(struct rup_data));
                if (n == NULL) {
                        err (1, "realloc");
                        /* NOTREACHED */
                }
                rup_data = n;
                rup_data_max += 16;
        }
        
        rup_data[rup_data_idx].host = strdup(host);
        rup_data[rup_data_idx].statstime = *st;
        rup_data_idx++;
}


static int
/*ARGSUSED*/
rstat_reply(char *replyp, struct netbuf *raddrp, struct netconfig *nconf)
{
        char host[NI_MAXHOST];
        statstime *host_stat = (statstime *)(void *)replyp;
        struct sockaddr *sa = raddrp->buf;

        if (!search_host(sa)) {
                if (getnameinfo(sa, (socklen_t)sa->sa_len, host, sizeof host,
                    NULL, 0, 0))
                        return 0;

                remember_host(sa);

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

        return 0;
}


static void
print_rup_data(const char *host, statstime *host_stat)
{
        struct tm *tmp_time;
        struct tm host_time;
        unsigned ups = 0, upm = 0, uph = 0, upd = 0;
        time_t now;

        char days_buf[16];
        char hours_buf[16];

        if (printtime)
                (void)printf("%-*.*s", HOST_WIDTH-4, HOST_WIDTH-4, host);
        else
                (void)printf("%-*.*s", HOST_WIDTH, HOST_WIDTH, host);

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

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

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

        if (uph != 0)
                (void)snprintf(hours_buf, sizeof(hours_buf), "%2u:%02u, ",
                    uph, upm);
        else
                if (upm != 0)
                        (void)snprintf(hours_buf, sizeof(hours_buf),
                            "%2u min%s ", upm, (upm == 1) ? ", " : "s,");
                else if (ups < 60)
                        (void)snprintf(hours_buf, sizeof(hours_buf),
                            "%2u secs ", ups);
                else
                        hours_buf[0] = '\0';
        if (printtime)
                (void)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');

        (void)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);
}


static int
onehost(char *host)
{
        CLIENT *rstat_clnt;
        statstime host_stat;
        static struct timeval timeout = {25, 0};
        
        rstat_clnt = clnt_create(host, RSTATPROG, RSTATVERS_TIME, "udp");
        if (rstat_clnt == NULL) {
                warnx("%s", clnt_spcreateerror(host));
                return 1;
        }

        (void)memset(&host_stat, 0, sizeof(host_stat));
        if (clnt_call(rstat_clnt, RSTATPROC_STATS, xdr_void, NULL,
            xdr_statstime, &host_stat, timeout) != RPC_SUCCESS) {
                warnx("%s",  clnt_sperror(rstat_clnt, host));
                clnt_destroy(rstat_clnt);
                return 1;
        }

        print_rup_data(host, &host_stat);
        clnt_destroy(rstat_clnt);
        return 0;
}

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

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

        clnt_stat = rpc_broadcast(RSTATPROG, RSTATVERS_TIME, RSTATPROC_STATS,
            (xdrproc_t)xdr_void, NULL, (xdrproc_t)xdr_statstime, (caddr_t)(void *)&host_stat,
            (resultproc_t)rstat_reply, "udp");
        if (clnt_stat != RPC_SUCCESS && clnt_stat != RPC_TIMEDOUT)
                errx(1, "%s", clnt_sperrno(clnt_stat));

        if (sort_type != SORT_NONE) {
                (void)putchar('\n');
                qsort(rup_data, rup_data_idx, sizeof(struct rup_data),
                      (int (*)(const void*, const void*))compare);

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

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

        setprogname(*argv);
        sort_type = SORT_NONE;
        retval = 0;
        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*/
                }
        
        (void)setlinebuf(stdout);

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

        return retval ? EXIT_FAILURE : EXIT_SUCCESS;
}

void
usage(void)
{
        (void)fprintf(stderr, "Usage: %s [-dhlt] [hosts ...]\n",
            getprogname());
        exit(EXIT_SUCCESS);
}