usr.bin/ruptime/ruptime.c

   1 /*
   2  * Copyright (c) 1983, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1983, 1993, 1994 The Regents of the University of California.  All rights reserved.
  30  * @(#)ruptime.c        8.2 (Berkeley) 4/5/94
  31  * $FreeBSD: src/usr.bin/ruptime/ruptime.c,v 1.12.2.1 2000/06/30 09:45:00 ps Exp $
  32  */
  33
  34 #include <sys/param.h>
  35
  36 #include <protocols/rwhod.h>
  37
  38 #include <dirent.h>
  39 #include <err.h>
  40 #include <errno.h>
  41 #include <fcntl.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <time.h>
  46 #include <unistd.h>
  47
  48 static struct hs {
  49         struct  whod *hs_wd;
  50         int     hs_nusers;
  51 } *hs;
  52
  53 #define LEFTEARTH(h)    (now - (h) > 4*24*60*60)
  54 #define ISDOWN(h)       (now - (h)->hs_wd->wd_recvtime > 11 * 60)
  55 #define WHDRSIZE        (sizeof(struct whod) - \
  56                             sizeof(((struct whod *)NULL)->wd_we))
  57
  58 static size_t nhosts;
  59 static time_t now;
  60 static int rflg = 1;
  61
  62 static int       hscmp(const void *, const void *);
  63 static char     *interval(time_t, const char *);
  64 static int       lcmp(const void *, const void *);
  65 static int       tcmp(const void *, const void *);
  66 static int       ucmp(const void *, const void *);
  67 static void      usage(void) __dead2;
  68
  69 int
  70 main(int argc, char *argv[])
  71 {
  72         struct dirent *dp;
  73         struct hs *hsp = NULL;
  74         struct whod *wd;
  75         struct whoent *we;
  76         DIR *dirp;
  77         size_t hspace;
  78         int aflg, ch, fd, maxloadav;
  79         char buf[sizeof(struct whod)];
  80         int (*cmp)(const void *, const void *);
  81         u_int cc, i;
  82
  83         aflg = 0;
  84         cmp = hscmp;
  85         while ((ch = getopt(argc, argv, "alrut")) != -1)
  86                 switch (ch) {
  87                 case 'a':
  88                         aflg = 1;
  89                         break;
  90                 case 'l':
  91                         cmp = lcmp;
  92                         break;
  93                 case 'r':
  94                         rflg = -1;
  95                         break;
  96                 case 't':
  97                         cmp = tcmp;
  98                         break;
  99                 case 'u':
 100                         cmp = ucmp;
 101                         break;
 102                 default:
 103                         usage();
 104                 }
 105         argc -= optind;
 106         argv += optind;
 107
 108         if (argc != 0)
 109                 usage();
 110
 111         if (chdir(_PATH_RWHODIR) || (dirp = opendir(".")) == NULL)
 112                 err(1, "%s", _PATH_RWHODIR);
 113
 114         maxloadav = -1;
 115         for (nhosts = hspace = 0; (dp = readdir(dirp)) != NULL;) {
 116                 if (dp->d_ino == 0 || strncmp(dp->d_name, "whod.", 5))
 117                         continue;
 118                 if ((fd = open(dp->d_name, O_RDONLY, 0)) < 0) {
 119                         warn("%s", dp->d_name);
 120                         continue;
 121                 }
 122                 cc = read(fd, buf, sizeof(struct whod));
 123                 (void)close(fd);
 124
 125                 if (cc < WHDRSIZE)
 126                         continue;
 127                 if (LEFTEARTH(((struct whod *)buf)->wd_recvtime))
 128                         continue;
 129                 if (nhosts == hspace) {
 130                         hspace += 40;
 131                         if ((hs = realloc(hs, hspace * sizeof(*hs))) == NULL)
 132                                 err(1, NULL);
 133                         hsp = hs + nhosts;
 134                 }
 135
 136                 if ((hsp->hs_wd = malloc((size_t)WHDRSIZE)) == NULL)
 137                         err(1, NULL);
 138                 memmove(hsp->hs_wd, buf, (size_t)WHDRSIZE);
 139
 140                 for (wd = (struct whod *)buf, i = 0; i < 2; ++i)
 141                         if (wd->wd_loadav[i] > maxloadav)
 142                                 maxloadav = wd->wd_loadav[i];
 143
 144                 for (hsp->hs_nusers = 0,
 145                     we = (struct whoent *)(buf + cc); --we >= wd->wd_we;)
 146                         if (aflg || we->we_idle < 3600)
 147                                 ++hsp->hs_nusers;
 148                 ++hsp;
 149                 ++nhosts;
 150         }
 151         if (nhosts == 0)
 152                 errx(1, "no hosts in %s", _PATH_RWHODIR);
 153
 154         (void)time(&now);
 155         qsort(hs, nhosts, sizeof(hs[0]), cmp);
 156         for (i = 0; i < nhosts; i++) {
 157                 hsp = &hs[i];
 158                 if (ISDOWN(hsp)) {
 159                         (void)printf("%-12.12s%s\n", hsp->hs_wd->wd_hostname,
 160                             interval(now - hsp->hs_wd->wd_recvtime, "down"));
 161                         continue;
 162                 }
 163                 (void)printf(
 164                     "%-12.12s%s,  %4d user%s  load %*.2f, %*.2f, %*.2f\n",
 165                     hsp->hs_wd->wd_hostname,
 166                     interval((time_t)hsp->hs_wd->wd_sendtime -
 167                         (time_t)hsp->hs_wd->wd_boottime, "  up"),
 168                     hsp->hs_nusers,
 169                     hsp->hs_nusers == 1 ? ", " : "s,",
 170                     maxloadav >= 1000 ? 5 : 4,
 171                         hsp->hs_wd->wd_loadav[0] / 100.0,
 172                     maxloadav >= 1000 ? 5 : 4,
 173                         hsp->hs_wd->wd_loadav[1] / 100.0,
 174                     maxloadav >= 1000 ? 5 : 4,
 175                         hsp->hs_wd->wd_loadav[2] / 100.0);
 176         }
 177         exit(0);
 178 }
 179
 180 static char *
 181 interval(time_t tval, const char *updown)
 182 {
 183         static char resbuf[32];
 184         int days, hours, minutes;
 185
 186         if (tval < 0) {
 187                 (void)snprintf(resbuf, sizeof(resbuf), "   %s ??:??", updown);
 188                 return (resbuf);
 189         }
 190                                                 /* round to minutes. */
 191         minutes = (tval + (60 - 1)) / 60;
 192         hours = minutes / 60;
 193         minutes %= 60;
 194         days = hours / 24;
 195         hours %= 24;
 196         if (days)
 197                 (void)snprintf(resbuf, sizeof(resbuf),
 198                     "%s %3d+%02d:%02d", updown, days, hours, minutes);
 199         else
 200                 (void)snprintf(resbuf, sizeof(resbuf),
 201                     "%s     %2d:%02d", updown, hours, minutes);
 202         return (resbuf);
 203 }
 204
 205 #define HS(a)   ((const struct hs *)(a))
 206
 207 /* Alphabetical comparison. */
 208 static int
 209 hscmp(const void *a1, const void *a2)
 210 {
 211         return (rflg *
 212             strcmp(HS(a1)->hs_wd->wd_hostname, HS(a2)->hs_wd->wd_hostname));
 213 }
 214
 215 /* Load average comparison. */
 216 static int
 217 lcmp(const void *a1, const void *a2)
 218 {
 219         if (ISDOWN(HS(a1)))
 220                 if (ISDOWN(HS(a2)))
 221                         return (tcmp(a1, a2));
 222                 else
 223                         return (rflg);
 224         else if (ISDOWN(HS(a2)))
 225                 return (-rflg);
 226         else
 227                 return (rflg *
 228                    (HS(a2)->hs_wd->wd_loadav[0] - HS(a1)->hs_wd->wd_loadav[0]));
 229 }
 230
 231 /* Number of users comparison. */
 232 static int
 233 ucmp(const void *a1, const void *a2)
 234 {
 235         if (ISDOWN(HS(a1)))
 236                 if (ISDOWN(HS(a2)))
 237                         return (tcmp(a1, a2));
 238                 else
 239                         return (rflg);
 240         else if (ISDOWN(HS(a2)))
 241                 return (-rflg);
 242         else
 243                 return (rflg * (HS(a2)->hs_nusers - HS(a1)->hs_nusers));
 244 }
 245
 246 /* Uptime comparison. */
 247 static int
 248 tcmp(const void *a1, const void *a2)
 249 {
 250         return (rflg * (
 251                 (ISDOWN(HS(a2)) ? HS(a2)->hs_wd->wd_recvtime - now
 252                     : HS(a2)->hs_wd->wd_sendtime - HS(a2)->hs_wd->wd_boottime)
 253                 -
 254                 (ISDOWN(HS(a1)) ? HS(a1)->hs_wd->wd_recvtime - now
 255                     : HS(a1)->hs_wd->wd_sendtime - HS(a1)->hs_wd->wd_boottime)
 256         ));
 257 }
 258
 259 static void
 260 usage(void)
 261 {
 262         (void)fprintf(stderr, "usage: ruptime [-alrut]\n");
 263         exit(1);
 264 }