usr.bin/rwho/rwho.c

   1 /*
   2  * Copyright (c) 1983, 1993
   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 The Regents of the University of California.  All rights reserved.
  30  * @(#)rwho.c   8.1 (Berkeley) 6/6/93
  31  * $FreeBSD: src/usr.bin/rwho/rwho.c,v 1.13.2.1 2002/03/12 19:49:09 phantom Exp $
  32  */
  33
  34 #include <sys/param.h>
  35 #include <sys/file.h>
  36
  37 #include <protocols/rwhod.h>
  38
  39 #include <dirent.h>
  40 #include <err.h>
  41 #include <langinfo.h>
  42 #include <locale.h>
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <time.h>
  47 #include <unistd.h>
  48
  49 struct  whod wd;
  50
  51 #define NUSERS  1000
  52
  53 struct  myutmp {
  54         char    myhost[sizeof(wd.wd_hostname)];
  55         int     myidle;
  56         struct  outmp myutmp;
  57 } myutmp[NUSERS];
  58
  59 #define WHDRSIZE        (sizeof (wd) - sizeof (wd.wd_we))
  60 /*
  61  * this macro should be shared with ruptime.
  62  */
  63 #define down(w,now)     ((now) - (w)->wd_recvtime > 11 * 60)
  64
  65 static void     usage(void);
  66 static int      utmpcmp(const void *, const void *);
  67
  68 int
  69 main(int argc, char **argv)
  70 {
  71         struct dirent *dp;
  72         struct whod *w = &wd;
  73         struct whoent *we;
  74         struct myutmp *mp;
  75         int f, n, i, ch;
  76         int width, d_first, aflg;
  77         int nusers;
  78         size_t cc;
  79         time_t now;
  80         DIR *dirp;
  81
  82         aflg = nusers = 0;
  83         setlocale(LC_TIME, "");
  84         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
  85
  86         while ((ch = getopt(argc, argv, "a")) != -1)
  87                 switch(ch) {
  88                 case 'a':
  89                         aflg = 1;
  90                         break;
  91                 case '?':
  92                 default:
  93                         usage();
  94                 }
  95         argc -= optind;
  96         argv += optind;
  97
  98         if (argc != 0)
  99                 usage();
 100
 101         if (chdir(_PATH_RWHODIR) || (dirp = opendir(".")) == NULL)
 102                 err(1, "%s", _PATH_RWHODIR);
 103         mp = myutmp;
 104         time(&now);
 105         while ((dp = readdir(dirp))) {
 106                 if (dp->d_ino == 0 || strncmp(dp->d_name, "whod.", 5))
 107                         continue;
 108                 f = open(dp->d_name, O_RDONLY);
 109                 if (f < 0)
 110                         continue;
 111                 cc = read(f, (char *)&wd, sizeof (struct whod));
 112                 if (cc < WHDRSIZE) {
 113                         close(f);
 114                         continue;
 115                 }
 116                 if (down(w,now)) {
 117                         close(f);
 118                         continue;
 119                 }
 120                 cc -= WHDRSIZE;
 121                 we = w->wd_we;
 122                 for (n = cc / sizeof (struct whoent); n > 0; n--) {
 123                         if (aflg == 0 && we->we_idle >= 60*60) {
 124                                 we++;
 125                                 continue;
 126                         }
 127                         if (nusers >= NUSERS)
 128                                 errx(1, "too many users");
 129                         mp->myutmp = we->we_utmp; mp->myidle = we->we_idle;
 130                         strcpy(mp->myhost, w->wd_hostname);
 131                         nusers++; we++; mp++;
 132                 }
 133                 close(f);
 134         }
 135         qsort((char *)myutmp, nusers, sizeof (struct myutmp), utmpcmp);
 136         mp = myutmp;
 137         width = 0;
 138         for (i = 0; i < nusers; i++) {
 139                 /* append one for the blank and use 8 for the out_line */
 140                 int j = strlen(mp->myhost) + 1 + sizeof(mp->myutmp.out_line);
 141                 if (j > width)
 142                         width = j;
 143                 mp++;
 144         }
 145         mp = myutmp;
 146         for (i = 0; i < nusers; i++) {
 147                 char buf[BUFSIZ], cbuf[80];
 148
 149                 strftime(cbuf, sizeof(cbuf),
 150                          d_first ? "%e %b %R" : "%b %e %R",
 151                          localtime((time_t *)&mp->myutmp.out_time));
 152                 sprintf(buf, "%s:%-.*s", mp->myhost,
 153                    (int)sizeof(mp->myutmp.out_line), mp->myutmp.out_line);
 154                 printf("%-*.*s %-*s %s",
 155                    (int)sizeof(mp->myutmp.out_name),
 156                    (int)sizeof(mp->myutmp.out_name),
 157                    mp->myutmp.out_name,
 158                    width,
 159                    buf,
 160                    cbuf);
 161                 mp->myidle /= 60;
 162                 if (mp->myidle) {
 163                         if (aflg) {
 164                                 if (mp->myidle >= 100*60)
 165                                         mp->myidle = 100*60 - 1;
 166                                 if (mp->myidle >= 60)
 167                                         printf(" %2d", mp->myidle / 60);
 168                                 else
 169                                         printf("   ");
 170                         } else
 171                                 printf(" ");
 172                         printf(":%02d", mp->myidle % 60);
 173                 }
 174                 printf("\n");
 175                 mp++;
 176         }
 177         exit(0);
 178 }
 179
 180
 181 static void
 182 usage(void)
 183 {
 184         fprintf(stderr, "usage: rwho [-a]\n");
 185         exit(1);
 186 }
 187
 188 #define MYUTMP(a) ((const struct myutmp *)(a))
 189
 190 static int
 191 utmpcmp(const void *u1, const void *u2)
 192 {
 193         int rc;
 194
 195         rc = strncmp(MYUTMP(u1)->myutmp.out_name, MYUTMP(u2)->myutmp.out_name,
 196                 sizeof(MYUTMP(u2)->myutmp.out_name));
 197         if (rc)
 198                 return (rc);
 199         rc = strcmp(MYUTMP(u1)->myhost, MYUTMP(u2)->myhost);
 200         if (rc)
 201                 return (rc);
 202         return (strncmp(MYUTMP(u1)->myutmp.out_line, MYUTMP(u2)->myutmp.out_line,
 203                 sizeof(MYUTMP(u2)->myutmp.out_line)));
 204 }