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. 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 The Regents of the University of California.  All rights reserved.
  34  * @(#)rwho.c   8.1 (Berkeley) 6/6/93
  35  * $FreeBSD: src/usr.bin/rwho/rwho.c,v 1.13.2.1 2002/03/12 19:49:09 phantom Exp $
  36  * $DragonFly: src/usr.bin/rwho/rwho.c,v 1.5 2008/10/16 01:52:33 swildner Exp $
  37  */
  38
  39 #include <sys/param.h>
  40 #include <sys/file.h>
  41
  42 #include <protocols/rwhod.h>
  43
  44 #include <dirent.h>
  45 #include <err.h>
  46 #include <langinfo.h>
  47 #include <locale.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51 #include <time.h>
  52 #include <unistd.h>
  53 #include <utmp.h>
  54
  55 struct  whod wd;
  56
  57 #define NUSERS  1000
  58
  59 struct  myutmp {
  60         char    myhost[sizeof(wd.wd_hostname)];
  61         int     myidle;
  62         struct  outmp myutmp;
  63 } myutmp[NUSERS];
  64
  65 #define WHDRSIZE        (sizeof (wd) - sizeof (wd.wd_we))
  66 /*
  67  * this macro should be shared with ruptime.
  68  */
  69 #define down(w,now)     ((now) - (w)->wd_recvtime > 11 * 60)
  70
  71 static void     usage(void);
  72 static int      utmpcmp(const void *, const void *);
  73
  74 int
  75 main(int argc, char **argv)
  76 {
  77         struct dirent *dp;
  78         struct whod *w = &wd;
  79         struct whoent *we;
  80         struct myutmp *mp;
  81         int f, n, i, ch;
  82         int width, d_first, aflg;
  83         int nusers;
  84         size_t cc;
  85         time_t now;
  86         DIR *dirp;
  87
  88         aflg = nusers = 0;
  89         setlocale(LC_TIME, "");
  90         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
  91
  92         while ((ch = getopt(argc, argv, "a")) != -1)
  93                 switch(ch) {
  94                 case 'a':
  95                         aflg = 1;
  96                         break;
  97                 case '?':
  98                 default:
  99                         usage();
 100                 }
 101         argc -= optind;
 102         argv += optind;
 103
 104         if (argc != 0)
 105                 usage();
 106
 107         if (chdir(_PATH_RWHODIR) || (dirp = opendir(".")) == NULL)
 108                 err(1, "%s", _PATH_RWHODIR);
 109         mp = myutmp;
 110         time(&now);
 111         while ((dp = readdir(dirp))) {
 112                 if (dp->d_ino == 0 || strncmp(dp->d_name, "whod.", 5))
 113                         continue;
 114                 f = open(dp->d_name, O_RDONLY);
 115                 if (f < 0)
 116                         continue;
 117                 cc = read(f, (char *)&wd, sizeof (struct whod));
 118                 if (cc < WHDRSIZE) {
 119                         close(f);
 120                         continue;
 121                 }
 122                 if (down(w,now)) {
 123                         close(f);
 124                         continue;
 125                 }
 126                 cc -= WHDRSIZE;
 127                 we = w->wd_we;
 128                 for (n = cc / sizeof (struct whoent); n > 0; n--) {
 129                         if (aflg == 0 && we->we_idle >= 60*60) {
 130                                 we++;
 131                                 continue;
 132                         }
 133                         if (nusers >= NUSERS)
 134                                 errx(1, "too many users");
 135                         mp->myutmp = we->we_utmp; mp->myidle = we->we_idle;
 136                         strcpy(mp->myhost, w->wd_hostname);
 137                         nusers++; we++; mp++;
 138                 }
 139                 close(f);
 140         }
 141         qsort((char *)myutmp, nusers, sizeof (struct myutmp), utmpcmp);
 142         mp = myutmp;
 143         width = 0;
 144         for (i = 0; i < nusers; i++) {
 145                 /* append one for the blank and use 8 for the out_line */
 146                 int j = strlen(mp->myhost) + 1 + sizeof(mp->myutmp.out_line);
 147                 if (j > width)
 148                         width = j;
 149                 mp++;
 150         }
 151         mp = myutmp;
 152         for (i = 0; i < nusers; i++) {
 153                 char buf[BUFSIZ], cbuf[80];
 154
 155                 strftime(cbuf, sizeof(cbuf),
 156                          d_first ? "%e %b %R" : "%b %e %R",
 157                          localtime((time_t *)&mp->myutmp.out_time));
 158                 sprintf(buf, "%s:%-.*s", mp->myhost,
 159                    (int)sizeof(mp->myutmp.out_line), mp->myutmp.out_line);
 160                 printf("%-*.*s %-*s %s",
 161                    UT_NAMESIZE, (int)sizeof(mp->myutmp.out_name),
 162                    mp->myutmp.out_name,
 163                    width,
 164                    buf,
 165                    cbuf);
 166                 mp->myidle /= 60;
 167                 if (mp->myidle) {
 168                         if (aflg) {
 169                                 if (mp->myidle >= 100*60)
 170                                         mp->myidle = 100*60 - 1;
 171                                 if (mp->myidle >= 60)
 172                                         printf(" %2d", mp->myidle / 60);
 173                                 else
 174                                         printf("   ");
 175                         } else
 176                                 printf(" ");
 177                         printf(":%02d", mp->myidle % 60);
 178                 }
 179                 printf("\n");
 180                 mp++;
 181         }
 182         exit(0);
 183 }
 184
 185
 186 static void
 187 usage(void)
 188 {
 189         fprintf(stderr, "usage: rwho [-a]\n");
 190         exit(1);
 191 }
 192
 193 #define MYUTMP(a) ((const struct myutmp *)(a))
 194
 195 static int
 196 utmpcmp(const void *u1, const void *u2)
 197 {
 198         int rc;
 199
 200         rc = strncmp(MYUTMP(u1)->myutmp.out_name, MYUTMP(u2)->myutmp.out_name,
 201                 sizeof(MYUTMP(u2)->myutmp.out_name));
 202         if (rc)
 203                 return (rc);
 204         rc = strcmp(MYUTMP(u1)->myhost, MYUTMP(u2)->myhost);
 205         if (rc)
 206                 return (rc);
 207         return (strncmp(MYUTMP(u1)->myutmp.out_line, MYUTMP(u2)->myutmp.out_line,
 208                 sizeof(MYUTMP(u2)->myutmp.out_line)));
 209 }