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  * $DragonFly: src/usr.bin/ruptime/ruptime.c,v 1.11 2005/09/12 14:35:51 liamfoy Exp $
  33  */
  34
  35 #include <sys/param.h>
  36
  37 #include <protocols/rwhod.h>
  38
  39 #include <dirent.h>
  40 #include <err.h>
  41 #include <errno.h>
  42 #include <fcntl.h>
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <time.h>
  47 #include <unistd.h>
  48
  49 struct hs {
  50         struct  whod *hs_wd;
  51         int     hs_nusers;
  52 } *hs;
  53
  54 #define LEFTEARTH(h)    (now - (h) > 4*24*60*60)
  55 #define ISDOWN(h)       (now - (h)->hs_wd->wd_recvtime > 11 * 60)
  56 #define WHDRSIZE        (sizeof(struct whod) - \
  57                             sizeof(((struct whod *)NULL)->wd_we))
  58
  59 size_t nhosts;
  60 time_t now;
  61 int rflg = 1;
  62
  63 int      hscmp(const void *, const void *);
  64 char    *interval(time_t, const char *);
  65 int      lcmp(const void *, const void *);
  66 void     morehosts(void);
  67 int      tcmp(const void *, const void *);
  68 int      ucmp(const void *, const void *);
  69 void     usage(void);
  70
  71 int
  72 main(int argc, char *argv[])
  73 {
  74         struct dirent *dp;
  75         struct hs *hsp = NULL;
  76         struct whod *wd;
  77         struct whoent *we;
  78         DIR *dirp;
  79         size_t hspace;
  80         int aflg, ch, fd, maxloadav;
  81         char buf[sizeof(struct whod)];
  82         int (*cmp)(const void *, const void *);
  83         u_int cc, i;
  84
  85         aflg = 0;
  86         cmp = hscmp;
  87         while ((ch = getopt(argc, argv, "alrut")) != -1)
  88                 switch (ch) {
  89                 case 'a':
  90                         aflg = 1;
  91                         break;
  92                 case 'l':
  93                         cmp = lcmp;
  94                         break;
  95                 case 'r':
  96                         rflg = -1;
  97                         break;
  98                 case 't':
  99                         cmp = tcmp;
 100                         break;
 101                 case 'u':
 102                         cmp = ucmp;
 103                         break;
 104                 default:
 105                         usage();
 106                 }
 107         argc -= optind;
 108         argv += optind;
 109
 110         if (argc != 0)
 111                 usage();
 112
 113         if (chdir(_PATH_RWHODIR) || (dirp = opendir(".")) == NULL)
 114                 err(1, "%s", _PATH_RWHODIR);
 115
 116         maxloadav = -1;
 117         for (nhosts = hspace = 0; (dp = readdir(dirp)) != NULL;) {
 118                 if (dp->d_ino == 0 || strncmp(dp->d_name, "whod.", 5))
 119                         continue;
 120                 if ((fd = open(dp->d_name, O_RDONLY, 0)) < 0) {
 121                         warn("%s", dp->d_name);
 122                         continue;
 123                 }
 124                 cc = read(fd, buf, sizeof(struct whod));
 125                 (void)close(fd);
 126
 127                 if (cc < WHDRSIZE)
 128                         continue;
 129                 if (LEFTEARTH(((struct whod *)buf)->wd_recvtime))
 130                         continue;
 131                 if (nhosts == hspace) {
 132                         hspace += 40;
 133                         if ((hs = realloc(hs, hspace * sizeof(*hs))) == NULL)
 134                                 err(1, NULL);
 135                         hsp = hs + nhosts;
 136                 }
 137
 138                 if ((hsp->hs_wd = malloc((size_t)WHDRSIZE)) == NULL)
 139                         err(1, NULL);
 140                 memmove(hsp->hs_wd, buf, (size_t)WHDRSIZE);
 141
 142                 for (wd = (struct whod *)buf, i = 0; i < 2; ++i)
 143                         if (wd->wd_loadav[i] > maxloadav)
 144                                 maxloadav = wd->wd_loadav[i];
 145
 146                 for (hsp->hs_nusers = 0,
 147                     we = (struct whoent *)(buf + cc); --we >= wd->wd_we;)
 148                         if (aflg || we->we_idle < 3600)
 149                                 ++hsp->hs_nusers;
 150                 ++hsp;
 151                 ++nhosts;
 152         }
 153         if (nhosts == 0)
 154                 errx(1, "no hosts in %s", _PATH_RWHODIR);
 155
 156         (void)time(&now);
 157         qsort(hs, nhosts, sizeof(hs[0]), cmp);
 158         for (i = 0; i < nhosts; i++) {
 159                 hsp = &hs[i];
 160                 if (ISDOWN(hsp)) {
 161                         (void)printf("%-12.12s%s\n", hsp->hs_wd->wd_hostname,
 162                             interval(now - hsp->hs_wd->wd_recvtime, "down"));
 163                         continue;
 164                 }
 165                 (void)printf(
 166                     "%-12.12s%s,  %4d user%s  load %*.2f, %*.2f, %*.2f\n",
 167                     hsp->hs_wd->wd_hostname,
 168                     interval((time_t)hsp->hs_wd->wd_sendtime -
 169                         (time_t)hsp->hs_wd->wd_boottime, "  up"),
 170                     hsp->hs_nusers,
 171                     hsp->hs_nusers == 1 ? ", " : "s,",
 172                     maxloadav >= 1000 ? 5 : 4,
 173                         hsp->hs_wd->wd_loadav[0] / 100.0,
 174                     maxloadav >= 1000 ? 5 : 4,
 175                         hsp->hs_wd->wd_loadav[1] / 100.0,
 176                     maxloadav >= 1000 ? 5 : 4,
 177                         hsp->hs_wd->wd_loadav[2] / 100.0);
 178         }
 179         exit(0);
 180 }
 181
 182 char *
 183 interval(time_t tval, const char *updown)
 184 {
 185         static char resbuf[32];
 186         int days, hours, minutes;
 187
 188         if (tval < 0) {
 189                 (void)snprintf(resbuf, sizeof(resbuf), "   %s ??:??", updown);
 190                 return (resbuf);
 191         }
 192                                                 /* round to minutes. */
 193         minutes = (tval + (60 - 1)) / 60;
 194         hours = minutes / 60;
 195         minutes %= 60;
 196         days = hours / 24;
 197         hours %= 24;
 198         if (days)
 199                 (void)snprintf(resbuf, sizeof(resbuf),
 200                     "%s %3d+%02d:%02d", updown, days, hours, minutes);
 201         else
 202                 (void)snprintf(resbuf, sizeof(resbuf),
 203                     "%s     %2d:%02d", updown, hours, minutes);
 204         return (resbuf);
 205 }
 206
 207 #define HS(a)   ((const struct hs *)(a))
 208
 209 /* Alphabetical comparison. */
 210 int
 211 hscmp(const void *a1, const void *a2)
 212 {
 213         return (rflg *
 214             strcmp(HS(a1)->hs_wd->wd_hostname, HS(a2)->hs_wd->wd_hostname));
 215 }
 216
 217 /* Load average comparison. */
 218 int
 219 lcmp(const void *a1, const void *a2)
 220 {
 221         if (ISDOWN(HS(a1)))
 222                 if (ISDOWN(HS(a2)))
 223                         return (tcmp(a1, a2));
 224                 else
 225                         return (rflg);
 226         else if (ISDOWN(HS(a2)))
 227                 return (-rflg);
 228         else
 229                 return (rflg *
 230                    (HS(a2)->hs_wd->wd_loadav[0] - HS(a1)->hs_wd->wd_loadav[0]));
 231 }
 232
 233 /* Number of users comparison. */
 234 int
 235 ucmp(const void *a1, const void *a2)
 236 {
 237         if (ISDOWN(HS(a1)))
 238                 if (ISDOWN(HS(a2)))
 239                         return (tcmp(a1, a2));
 240                 else
 241                         return (rflg);
 242         else if (ISDOWN(HS(a2)))
 243                 return (-rflg);
 244         else
 245                 return (rflg * (HS(a2)->hs_nusers - HS(a1)->hs_nusers));
 246 }
 247
 248 /* Uptime comparison. */
 249 int
 250 tcmp(const void *a1, const void *a2)
 251 {
 252         return (rflg * (
 253                 (ISDOWN(HS(a2)) ? HS(a2)->hs_wd->wd_recvtime - now
 254                     : HS(a2)->hs_wd->wd_sendtime - HS(a2)->hs_wd->wd_boottime)
 255                 -
 256                 (ISDOWN(HS(a1)) ? HS(a1)->hs_wd->wd_recvtime - now
 257                     : HS(a1)->hs_wd->wd_sendtime - HS(a1)->hs_wd->wd_boottime)
 258         ));
 259 }
 260
 261 void
 262 usage(void)
 263 {
 264         (void)fprintf(stderr, "usage: ruptime [-alrut]\n");
 265         exit(1);
 266 }