usr.bin/last/want.c

   1 /*      $NetBSD: last.c,v 1.15 2000/06/30 06:19:58 simonb Exp $ */
   2
   3 /*
   4  * Copyright (c) 1987, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31 static struct utmp *buf;
  32
  33 static void onintr(int);
  34 static int want(struct utmp *, int);
  35
  36 /*
  37  * wtmp --
  38  *      read through the wtmp file
  39  */
  40 void
  41 wtmp(const char *file, int namesz, int linesz, int hostsz)
  42 {
  43         struct utmp     *bp;            /* current structure */
  44         TTY     *T;                     /* tty list entry */
  45         struct stat     stb;            /* stat of file for sz */
  46         time_t  delta;                  /* time difference */
  47         off_t   bl;
  48         int     bytes, wfd;
  49         char    *ct;
  50         const char *crmsg;
  51         size_t  len = sizeof(*buf) * MAXUTMP;
  52
  53         if ((buf = malloc(len)) == NULL)
  54                 err(1, "Cannot allocate utmp buffer");
  55
  56         crmsg = NULL;
  57
  58         if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1)
  59                 err(1, "%s", file);
  60         bl = (stb.st_size + len - 1) / len;
  61
  62         buf[FIRSTVALID].ut_timefld = time(NULL);
  63         (void)signal(SIGINT, onintr);
  64         (void)signal(SIGQUIT, onintr);
  65
  66         while (--bl >= 0) {
  67                 if (lseek(wfd, bl * len, SEEK_SET) == -1 ||
  68                     (bytes = read(wfd, buf, len)) == -1)
  69                         err(1, "%s", file);
  70                 for (bp = &buf[bytes / sizeof(*buf) - 1]; bp >= buf; --bp) {
  71                         /*
  72                          * if the terminal line is '~', the machine stopped.
  73                          * see utmp(5) for more info.
  74                          */
  75                         if (bp->ut_line[0] == '~' && !bp->ut_line[1]) {
  76                                 /* everybody just logged out */
  77                                 for (T = ttylist; T; T = T->next)
  78                                         T->logout = -bp->ut_timefld;
  79                                 currentout = -bp->ut_timefld;
  80                                 crmsg = strncmp(bp->ut_name, "shutdown",
  81                                     namesz) ? "crash" : "shutdown";
  82                                 if (want(bp, NO)) {
  83                                         ct = fmttime(bp->ut_timefld, fulltime);
  84                                         printf("%-*.*s  %-*.*s %-*.*s %s\n",
  85                                             namesz, namesz, bp->ut_name,
  86                                             linesz, linesz, bp->ut_line,
  87                                             hostsz, hostsz, bp->ut_host, ct);
  88                                         if (maxrec != -1 && !--maxrec)
  89                                                 return;
  90                                 }
  91                                 continue;
  92                         }
  93                         /*
  94                          * if the line is '{' or '|', date got set; see
  95                          * utmp(5) for more info.
  96                          */
  97                         if ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|')
  98                             && !bp->ut_line[1]) {
  99                                 if (want(bp, NO)) {
 100                                         ct = fmttime(bp->ut_timefld, fulltime);
 101                                 printf("%-*.*s  %-*.*s %-*.*s %s\n",
 102                                     namesz, namesz,
 103                                     bp->ut_name,
 104                                     linesz, linesz,
 105                                     bp->ut_line,
 106                                     hostsz, hostsz,
 107                                     bp->ut_host,
 108                                     ct);
 109                                         if (maxrec && !--maxrec)
 110                                                 return;
 111                                 }
 112                                 continue;
 113                         }
 114                         /* find associated tty */
 115                         for (T = ttylist;; T = T->next) {
 116                                 if (!T) {
 117                                         /* add new one */
 118                                         T = addtty(bp->ut_line);
 119                                         break;
 120                                 }
 121                                 if (!strncmp(T->tty, bp->ut_line, LINESIZE))
 122                                         break;
 123                         }
 124                         if (TYPE(bp) == SIGNATURE)
 125                                 continue;
 126                         if (bp->ut_name[0] && want(bp, YES)) {
 127                                 ct = fmttime(bp->ut_timefld, fulltime);
 128                                 printf("%-*.*s  %-*.*s %-*.*s %s ",
 129                                     namesz, namesz, bp->ut_name,
 130                                     linesz, linesz, bp->ut_line,
 131                                     hostsz, hostsz, bp->ut_host,
 132                                     ct);
 133                                 if (!T->logout)
 134                                         puts("  still logged in");
 135                                 else {
 136                                         if (T->logout < 0) {
 137                                                 T->logout = -T->logout;
 138                                                 printf("- %s", crmsg);
 139                                         }
 140                                         else
 141                                                 printf("- %s",
 142                                                     fmttime(T->logout,
 143                                                     fulltime | TIMEONLY));
 144                                         delta = T->logout - bp->ut_timefld;
 145                                         if (delta < SECSPERDAY)
 146                                                 printf("  (%s)\n",
 147                                                     fmttime(delta,
 148                                                     fulltime | TIMEONLY | GMT));
 149                                         else
 150                                                 printf(" (%ld+%s)\n",
 151                                                     delta / SECSPERDAY,
 152                                                     fmttime(delta,
 153                                                     fulltime | TIMEONLY | GMT));
 154                                 }
 155                                 if (maxrec != -1 && !--maxrec)
 156                                         return;
 157                         }
 158                         T->logout = bp->ut_timefld;
 159                 }
 160         }
 161         fulltime = 1;   /* show full time */
 162         crmsg = fmttime(buf[FIRSTVALID].ut_timefld, FULLTIME);
 163         if ((ct = strrchr(file, '/')) != NULL)
 164                 ct++;
 165         printf("\n%s begins %s\n", ct ? ct : file, crmsg);
 166 }
 167
 168 /*
 169  * want --
 170  *      see if want this entry
 171  */
 172 static int
 173 want(struct utmp *bp, int check)
 174 {
 175         ARG *step;
 176
 177         if (check) {
 178                 /*
 179                  * when uucp and ftp log in over a network, the entry in
 180                  * the utmp file is the name plus their process id.  See
 181                  * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information.
 182                  */
 183                 if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1))
 184                         bp->ut_line[3] = '\0';
 185                 else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1))
 186                         bp->ut_line[4] = '\0';
 187         }
 188         if (!arglist)
 189                 return (YES);
 190
 191         for (step = arglist; step; step = step->next)
 192                 switch(step->type) {
 193                 case HOST_TYPE:
 194                         if (!strncasecmp(step->name, bp->ut_host, HOSTSIZE))
 195                                 return (YES);
 196                         break;
 197                 case TTY_TYPE:
 198                         if (!strncmp(step->name, bp->ut_line, LINESIZE))
 199                                 return (YES);
 200                         break;
 201                 case USER_TYPE:
 202                         if (!strncmp(step->name, bp->ut_name, NAMESIZE))
 203                                 return (YES);
 204                         break;
 205         }
 206         return (NO);
 207 }
 208
 209 /*
 210  * onintr --
 211  *      on interrupt, we inform the user how far we've gotten
 212  */
 213 static void
 214 onintr(int signo)
 215 {
 216
 217         printf("\ninterrupted %s\n", fmttime(buf[FIRSTVALID].ut_timefld,
 218             FULLTIME));
 219         if (signo == SIGINT)
 220                 exit(1);
 221         (void)fflush(stdout);           /* fix required for rsh */
 222 }