473 lines
12 KiB
C
473 lines
12 KiB
C
/* $NetBSD: last.c,v 1.15 2000/06/30 06:19:58 simonb Exp $ */
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/*
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* Copyright (c) 1987, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT(
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"@(#) Copyright (c) 1987, 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)last.c 8.2 (Berkeley) 4/2/94";
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#endif
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__RCSID("$NetBSD: last.c,v 1.15 2000/06/30 06:19:58 simonb Exp $");
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <tzfile.h>
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#include <unistd.h>
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#include <utmp.h>
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#define NO 0 /* false/no */
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#define YES 1 /* true/yes */
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#define TBUFLEN 30 /* length of time string buffer */
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#define TFMT "%a %b %d %R" /* strftime format string */
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#define LTFMT "%a %b %d %Y %T" /* strftime long format string */
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#define TFMTS "%R" /* strftime format string - time only */
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#define LTFMTS "%T" /* strftime long format string - " */
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/* fmttime() flags */
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#define FULLTIME 0x1 /* show year, seconds */
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#define TIMEONLY 0x2 /* show time only, not date */
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#define GMT 0x4 /* show time at GMT, for offsets only */
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static struct utmp buf[1024]; /* utmp read buffer */
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typedef struct arg {
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char *name; /* argument */
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#define HOST_TYPE -2
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#define TTY_TYPE -3
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#define USER_TYPE -4
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int type; /* type of arg */
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struct arg *next; /* linked list pointer */
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} ARG;
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ARG *arglist; /* head of linked list */
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typedef struct ttytab {
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time_t logout; /* log out time */
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char tty[UT_LINESIZE + 1]; /* terminal name */
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struct ttytab *next; /* linked list pointer */
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} TTY;
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TTY *ttylist; /* head of linked list */
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static time_t currentout; /* current logout value */
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static long maxrec; /* records to display */
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static char *file = _PATH_WTMP; /* wtmp file */
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static int fulltime = 0; /* Display seconds? */
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int main __P((int, char *[]));
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void addarg __P((int, char *));
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TTY *addtty __P((char *));
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void hostconv __P((char *));
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void onintr __P((int));
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char *ttyconv __P((char *));
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int want __P((struct utmp *, int));
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void wtmp __P((void));
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char *fmttime __P((time_t, int));
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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int ch;
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char *p;
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maxrec = -1;
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while ((ch = getopt(argc, argv, "0123456789f:h:t:T")) != -1)
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switch (ch) {
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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/*
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* kludge: last was originally designed to take
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* a number after a dash.
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*/
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if (maxrec == -1) {
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p = argv[optind - 1];
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if (p[0] == '-' && p[1] == ch && !p[2])
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maxrec = atol(++p);
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else
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maxrec = atol(argv[optind] + 1);
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if (!maxrec)
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exit(0);
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}
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break;
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case 'f':
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file = optarg;
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break;
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case 'h':
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hostconv(optarg);
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addarg(HOST_TYPE, optarg);
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break;
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case 't':
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addarg(TTY_TYPE, ttyconv(optarg));
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break;
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case 'T':
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fulltime = 1;
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break;
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case '?':
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default:
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(void)fprintf(stderr,
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"usage: last [-#] [-f file] [-t tty] [-h hostname] [-T] [user ...]\n");
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exit(1);
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}
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if (argc) {
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setlinebuf(stdout);
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for (argv += optind; *argv; ++argv) {
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#define COMPATIBILITY
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#ifdef COMPATIBILITY
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/* code to allow "last p5" to work */
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addarg(TTY_TYPE, ttyconv(*argv));
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#endif
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addarg(USER_TYPE, *argv);
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}
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}
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wtmp();
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exit(0);
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}
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/*
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* wtmp --
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* read through the wtmp file
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*/
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void
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wtmp()
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{
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struct utmp *bp; /* current structure */
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TTY *T; /* tty list entry */
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struct stat stb; /* stat of file for size */
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time_t delta; /* time difference */
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off_t bl;
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int bytes, wfd;
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char *ct, *crmsg;
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crmsg = NULL;
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if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1)
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err(1, "%s", file);
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bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf);
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(void)time(&buf[0].ut_time);
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(void)signal(SIGINT, onintr);
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(void)signal(SIGQUIT, onintr);
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while (--bl >= 0) {
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if (lseek(wfd, bl * sizeof(buf), SEEK_SET) == -1 ||
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(bytes = read(wfd, buf, sizeof(buf))) == -1)
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err(1, "%s", file);
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for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp) {
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/*
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* if the terminal line is '~', the machine stopped.
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* see utmp(5) for more info.
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*/
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if (bp->ut_line[0] == '~' && !bp->ut_line[1]) {
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/* everybody just logged out */
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for (T = ttylist; T; T = T->next)
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T->logout = -bp->ut_time;
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currentout = -bp->ut_time;
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crmsg = strncmp(bp->ut_name, "shutdown",
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UT_NAMESIZE) ? "crash" : "shutdown";
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if (want(bp, NO)) {
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ct = fmttime(bp->ut_time, fulltime);
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printf("%-*.*s %-*.*s %-*.*s %s\n",
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(int)UT_NAMESIZE, (int)UT_NAMESIZE,
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bp->ut_name, (int)UT_LINESIZE,
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(int)UT_LINESIZE, bp->ut_line,
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(int)UT_HOSTSIZE, (int)UT_HOSTSIZE,
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bp->ut_host, ct);
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if (maxrec != -1 && !--maxrec)
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return;
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}
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continue;
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}
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/*
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* if the line is '{' or '|', date got set; see
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* utmp(5) for more info.
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*/
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if ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|')
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&& !bp->ut_line[1]) {
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if (want(bp, NO)) {
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ct = fmttime(bp->ut_time, fulltime);
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printf("%-*.*s %-*.*s %-*.*s %s\n",
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(int)UT_NAMESIZE, (int)UT_NAMESIZE,
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bp->ut_name,
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(int)UT_LINESIZE, (int)UT_LINESIZE,
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bp->ut_line,
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(int)UT_HOSTSIZE, (int)UT_HOSTSIZE,
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bp->ut_host,
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ct);
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if (maxrec && !--maxrec)
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return;
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}
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continue;
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}
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/* find associated tty */
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for (T = ttylist;; T = T->next) {
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if (!T) {
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/* add new one */
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T = addtty(bp->ut_line);
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break;
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}
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if (!strncmp(T->tty, bp->ut_line, UT_LINESIZE))
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break;
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}
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if (bp->ut_name[0] && want(bp, YES)) {
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ct = fmttime(bp->ut_time, fulltime);
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printf("%-*.*s %-*.*s %-*.*s %s ",
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(int)UT_NAMESIZE, (int)UT_NAMESIZE, bp->ut_name,
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(int)UT_LINESIZE, (int)UT_LINESIZE, bp->ut_line,
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(int)UT_HOSTSIZE, (int)UT_HOSTSIZE, bp->ut_host,
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ct);
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if (!T->logout)
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puts(" still logged in");
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else {
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if (T->logout < 0) {
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T->logout = -T->logout;
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printf("- %s", crmsg);
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}
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else
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printf("- %s",
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fmttime(T->logout,
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fulltime | TIMEONLY));
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delta = T->logout - bp->ut_time;
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if (delta < SECSPERDAY)
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printf(" (%s)\n",
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fmttime(delta,
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fulltime | TIMEONLY | GMT));
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else
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printf(" (%ld+%s)\n",
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delta / SECSPERDAY,
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fmttime(delta,
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fulltime | TIMEONLY | GMT));
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}
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if (maxrec != -1 && !--maxrec)
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return;
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}
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T->logout = bp->ut_time;
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}
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}
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fulltime = 1; /* show full time */
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ct = fmttime(buf[0].ut_time, FULLTIME);
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printf("\nwtmp begins %s\n", ct);
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}
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/*
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* want --
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* see if want this entry
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*/
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int
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want(bp, check)
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struct utmp *bp;
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int check;
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{
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ARG *step;
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if (check) {
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/*
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* when uucp and ftp log in over a network, the entry in
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* the utmp file is the name plus their process id. See
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* etc/ftpd.c and usr.bin/uucp/uucpd.c for more information.
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*/
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if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1))
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bp->ut_line[3] = '\0';
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else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1))
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bp->ut_line[4] = '\0';
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}
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if (!arglist)
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return (YES);
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for (step = arglist; step; step = step->next)
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switch(step->type) {
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case HOST_TYPE:
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if (!strncasecmp(step->name, bp->ut_host, UT_HOSTSIZE))
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return (YES);
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break;
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case TTY_TYPE:
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if (!strncmp(step->name, bp->ut_line, UT_LINESIZE))
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return (YES);
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break;
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case USER_TYPE:
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if (!strncmp(step->name, bp->ut_name, UT_NAMESIZE))
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return (YES);
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break;
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}
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return (NO);
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}
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/*
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* addarg --
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* add an entry to a linked list of arguments
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*/
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void
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addarg(type, arg)
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int type;
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char *arg;
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{
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ARG *cur;
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if (!(cur = (ARG *)malloc((u_int)sizeof(ARG))))
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err(1, "malloc failure");
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cur->next = arglist;
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cur->type = type;
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cur->name = arg;
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arglist = cur;
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}
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/*
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* addtty --
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* add an entry to a linked list of ttys
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*/
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TTY *
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addtty(ttyname)
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char *ttyname;
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{
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TTY *cur;
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if (!(cur = (TTY *)malloc((u_int)sizeof(TTY))))
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err(1, "malloc failure");
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cur->next = ttylist;
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cur->logout = currentout;
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memmove(cur->tty, ttyname, UT_LINESIZE);
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return (ttylist = cur);
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}
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/*
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* hostconv --
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* convert the hostname to search pattern; if the supplied host name
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* has a domain attached that is the same as the current domain, rip
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* off the domain suffix since that's what login(1) does.
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*/
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void
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hostconv(arg)
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char *arg;
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{
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static int first = 1;
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static char *hostdot, name[MAXHOSTNAMELEN + 1];
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char *argdot;
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if (!(argdot = strchr(arg, '.')))
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return;
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if (first) {
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first = 0;
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if (gethostname(name, sizeof(name)))
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err(1, "gethostname");
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name[sizeof(name) - 1] = '\0';
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hostdot = strchr(name, '.');
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}
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if (hostdot && !strcasecmp(hostdot, argdot))
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*argdot = '\0';
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}
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/*
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* ttyconv --
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* convert tty to correct name.
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*/
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char *
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ttyconv(arg)
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char *arg;
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{
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char *mval;
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/*
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* kludge -- we assume that all tty's end with
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* a two character suffix.
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*/
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if (strlen(arg) == 2) {
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/* either 6 for "ttyxx" or 8 for "console" */
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if (!(mval = malloc((u_int)8)))
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err(1, "malloc failure");
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if (!strcmp(arg, "co"))
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(void)strcpy(mval, "console");
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else {
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(void)strcpy(mval, "tty");
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(void)strcpy(mval + 3, arg);
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}
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return (mval);
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}
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if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1))
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return (arg + 5);
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return (arg);
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}
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/*
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* fmttime --
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* return pointer to (static) formatted time string.
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*/
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char *
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fmttime(t, flags)
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time_t t;
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int flags;
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{
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struct tm *tm;
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static char tbuf[TBUFLEN];
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tm = (flags & GMT) ? gmtime(&t) : localtime(&t);
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strftime(tbuf, sizeof(tbuf),
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(flags & TIMEONLY)
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? (flags & FULLTIME ? LTFMTS : TFMTS)
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: (flags & FULLTIME ? LTFMT : TFMT),
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tm);
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return (tbuf);
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}
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/*
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* onintr --
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* on interrupt, we inform the user how far we've gotten
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*/
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void
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onintr(signo)
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int signo;
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{
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printf("\ninterrupted %s\n", fmttime(buf[0].ut_time, FULLTIME));
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if (signo == SIGINT)
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exit(1);
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(void)fflush(stdout); /* fix required for rsh */
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}
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