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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1983, 1993, 1994 The Regents of the University of California.  All rights reserved.
  34  * @(#)ruptime.c        8.2 (Berkeley) 4/5/94
  35  * $FreeBSD: src/usr.bin/ruptime/ruptime.c,v 1.12.2.1 2000/06/30 09:45:00 ps Exp $
  36  * $DragonFly: src/usr.bin/ruptime/ruptime.c,v 1.11 2005/09/12 14:35:51 liamfoy Exp $
  37  */
  38
  39 #include <sys/param.h>
  40
  41 #include <protocols/rwhod.h>
  42
  43 #include <dirent.h>
  44 #include <err.h>
  45 #include <errno.h>
  46 #include <fcntl.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <time.h>
  51 #include <unistd.h>
  52
  53 struct hs {
  54         struct  whod *hs_wd;
  55         int     hs_nusers;
  56 } *hs;
  57
  58 #define LEFTEARTH(h)    (now - (h) > 4*24*60*60)
  59 #define ISDOWN(h)       (now - (h)->hs_wd->wd_recvtime > 11 * 60)
  60 #define WHDRSIZE        (sizeof(struct whod) - \
  61                             sizeof(((struct whod *)NULL)->wd_we))
  62
  63 size_t nhosts;
  64 time_t now;
  65 int rflg = 1;
  66
  67 int      hscmp(const void *, const void *);
  68 char    *interval(time_t, const char *);
  69 int      lcmp(const void *, const void *);
  70 void     morehosts(void);
  71 int      tcmp(const void *, const void *);
  72 int      ucmp(const void *, const void *);
  73 void     usage(void);
  74
  75 int
  76 main(int argc, char *argv[])
  77 {
  78         struct dirent *dp;
  79         struct hs *hsp = NULL;
  80         struct whod *wd;
  81         struct whoent *we;
  82         DIR *dirp;
  83         size_t hspace;
  84         int aflg, ch, fd, maxloadav;
  85         char buf[sizeof(struct whod)];
  86         int (*cmp)(const void *, const void *);
  87         u_int cc, i;
  88
  89         aflg = 0;
  90         cmp = hscmp;
  91         while ((ch = getopt(argc, argv, "alrut")) != -1)
  92                 switch (ch) {
  93                 case 'a':
  94                         aflg = 1;
  95                         break;
  96                 case 'l':
  97                         cmp = lcmp;
  98                         break;
  99                 case 'r':
 100                         rflg = -1;
 101                         break;
 102                 case 't':
 103                         cmp = tcmp;
 104                         break;
 105                 case 'u':
 106                         cmp = ucmp;
 107                         break;
 108                 default:
 109                         usage();
 110                 }
 111         argc -= optind;
 112         argv += optind;
 113
 114         if (argc != 0)
 115                 usage();
 116
 117         if (chdir(_PATH_RWHODIR) || (dirp = opendir(".")) == NULL)
 118                 err(1, "%s", _PATH_RWHODIR);
 119
 120         maxloadav = -1;
 121         for (nhosts = hspace = 0; (dp = readdir(dirp)) != NULL;) {
 122                 if (dp->d_ino == 0 || strncmp(dp->d_name, "whod.", 5))
 123                         continue;
 124                 if ((fd = open(dp->d_name, O_RDONLY, 0)) < 0) {
 125                         warn("%s", dp->d_name);
 126                         continue;
 127                 }
 128                 cc = read(fd, buf, sizeof(struct whod));
 129                 (void)close(fd);
 130
 131                 if (cc < WHDRSIZE)
 132                         continue;
 133                 if (LEFTEARTH(((struct whod *)buf)->wd_recvtime))
 134                         continue;
 135                 if (nhosts == hspace) {
 136                         hspace += 40;
 137                         if ((hs = realloc(hs, hspace * sizeof(*hs))) == NULL)
 138                                 err(1, NULL);
 139                         hsp = hs + nhosts;
 140                 }
 141
 142                 if ((hsp->hs_wd = malloc((size_t)WHDRSIZE)) == NULL)
 143                         err(1, NULL);
 144                 memmove(hsp->hs_wd, buf, (size_t)WHDRSIZE);
 145
 146                 for (wd = (struct whod *)buf, i = 0; i < 2; ++i)
 147                         if (wd->wd_loadav[i] > maxloadav)
 148                                 maxloadav = wd->wd_loadav[i];
 149
 150                 for (hsp->hs_nusers = 0,
 151                     we = (struct whoent *)(buf + cc); --we >= wd->wd_we;)
 152                         if (aflg || we->we_idle < 3600)
 153                                 ++hsp->hs_nusers;
 154                 ++hsp;
 155                 ++nhosts;
 156         }
 157         if (nhosts == 0)
 158                 errx(1, "no hosts in %s", _PATH_RWHODIR);
 159
 160         (void)time(&now);
 161         qsort(hs, nhosts, sizeof(hs[0]), cmp);
 162         for (i = 0; i < nhosts; i++) {
 163                 hsp = &hs[i];
 164                 if (ISDOWN(hsp)) {
 165                         (void)printf("%-12.12s%s\n", hsp->hs_wd->wd_hostname,
 166                             interval(now - hsp->hs_wd->wd_recvtime, "down"));
 167                         continue;
 168                 }
 169                 (void)printf(
 170                     "%-12.12s%s,  %4d user%s  load %*.2f, %*.2f, %*.2f\n",
 171                     hsp->hs_wd->wd_hostname,
 172                     interval((time_t)hsp->hs_wd->wd_sendtime -
 173                         (time_t)hsp->hs_wd->wd_boottime, "  up"),
 174                     hsp->hs_nusers,
 175                     hsp->hs_nusers == 1 ? ", " : "s,",
 176                     maxloadav >= 1000 ? 5 : 4,
 177                         hsp->hs_wd->wd_loadav[0] / 100.0,
 178                     maxloadav >= 1000 ? 5 : 4,
 179                         hsp->hs_wd->wd_loadav[1] / 100.0,
 180                     maxloadav >= 1000 ? 5 : 4,
 181                         hsp->hs_wd->wd_loadav[2] / 100.0);
 182         }
 183         exit(0);
 184 }
 185
 186 char *
 187 interval(time_t tval, const char *updown)
 188 {
 189         static char resbuf[32];
 190         int days, hours, minutes;
 191
 192         if (tval < 0) {
 193                 (void)snprintf(resbuf, sizeof(resbuf), "   %s ??:??", updown);
 194                 return (resbuf);
 195         }
 196                                                 /* round to minutes. */
 197         minutes = (tval + (60 - 1)) / 60;
 198         hours = minutes / 60;
 199         minutes %= 60;
 200         days = hours / 24;
 201         hours %= 24;
 202         if (days)
 203                 (void)snprintf(resbuf, sizeof(resbuf),
 204                     "%s %3d+%02d:%02d", updown, days, hours, minutes);
 205         else
 206                 (void)snprintf(resbuf, sizeof(resbuf),
 207                     "%s     %2d:%02d", updown, hours, minutes);
 208         return (resbuf);
 209 }
 210
 211 #define HS(a)   ((const struct hs *)(a))
 212
 213 /* Alphabetical comparison. */
 214 int
 215 hscmp(const void *a1, const void *a2)
 216 {
 217         return (rflg *
 218             strcmp(HS(a1)->hs_wd->wd_hostname, HS(a2)->hs_wd->wd_hostname));
 219 }
 220
 221 /* Load average comparison. */
 222 int
 223 lcmp(const void *a1, const void *a2)
 224 {
 225         if (ISDOWN(HS(a1)))
 226                 if (ISDOWN(HS(a2)))
 227                         return (tcmp(a1, a2));
 228                 else
 229                         return (rflg);
 230         else if (ISDOWN(HS(a2)))
 231                 return (-rflg);
 232         else
 233                 return (rflg *
 234                    (HS(a2)->hs_wd->wd_loadav[0] - HS(a1)->hs_wd->wd_loadav[0]));
 235 }
 236
 237 /* Number of users comparison. */
 238 int
 239 ucmp(const void *a1, const void *a2)
 240 {
 241         if (ISDOWN(HS(a1)))
 242                 if (ISDOWN(HS(a2)))
 243                         return (tcmp(a1, a2));
 244                 else
 245                         return (rflg);
 246         else if (ISDOWN(HS(a2)))
 247                 return (-rflg);
 248         else
 249                 return (rflg * (HS(a2)->hs_nusers - HS(a1)->hs_nusers));
 250 }
 251
 252 /* Uptime comparison. */
 253 int
 254 tcmp(const void *a1, const void *a2)
 255 {
 256         return (rflg * (
 257                 (ISDOWN(HS(a2)) ? HS(a2)->hs_wd->wd_recvtime - now
 258                     : HS(a2)->hs_wd->wd_sendtime - HS(a2)->hs_wd->wd_boottime)
 259                 -
 260                 (ISDOWN(HS(a1)) ? HS(a1)->hs_wd->wd_recvtime - now
 261                     : HS(a1)->hs_wd->wd_sendtime - HS(a1)->hs_wd->wd_boottime)
 262         ));
 263 }
 264
 265 void
 266 usage(void)
 267 {
 268         (void)fprintf(stderr, "usage: ruptime [-alrut]\n");
 269         exit(1);
 270 }