576 lines
14 KiB
C
576 lines
14 KiB
C
/*
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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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#ifndef lint
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static const char 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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static const char sccsid[] = "@(#)last.c 8.2 (Berkeley) 4/2/94";
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#endif /* not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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 <errno.h>
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#include <fcntl.h>
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#include <langinfo.h>
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#include <locale.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 <unistd.h>
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#include <utmp.h>
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#include <sys/queue.h>
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#define NO 0 /* false/no */
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#define YES 1 /* true/yes */
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#define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
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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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LIST_HEAD(ttylisthead, ttytab) ttylist;
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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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LIST_ENTRY(ttytab) list;
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};
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static const char *crmsg; /* cause of last reboot */
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static long currentout, /* current logout value */
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maxrec; /* records to display */
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static const char *file = _PATH_WTMP; /* wtmp file */
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static int sflag = 0; /* show delta in seconds */
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static int width = 5; /* show seconds in delta */
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static int yflag; /* show year */
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static int d_first;
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static int snapfound = 0; /* found snapshot entry? */
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static time_t snaptime; /* if != 0, we will only
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* report users logged in
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* at this snapshot time
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*/
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void addarg(int, char *);
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time_t dateconv(char *);
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void doentry(struct utmp *);
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void hostconv(char *);
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void onintr(int);
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void printentry(struct utmp *, struct ttytab *);
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char *ttyconv(char *);
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int want(struct utmp *);
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void usage(void);
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void wtmp(void);
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void
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usage(void)
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{
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(void)fprintf(stderr,
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"usage: last [-swy] [-d [[CC]YY][MMDD]hhmm[.SS]] [-f file] [-h host]\n"
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" [-n maxrec] [-t tty] [user ...]\n");
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exit(1);
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}
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int
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main(int argc, char *argv[])
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{
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int ch;
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char *p;
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(void) setlocale(LC_TIME, "");
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d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
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maxrec = -1;
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snaptime = 0;
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while ((ch = getopt(argc, argv, "0123456789d:f:h:n:st:wy")) != -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 = strchr(argv[optind - 1], ch);
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if (p == NULL)
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p = strchr(argv[optind], ch);
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maxrec = atol(p);
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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 'd':
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snaptime = dateconv(optarg);
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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 'n':
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errno = 0;
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maxrec = strtol(optarg, &p, 10);
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if (p == optarg || *p != '\0' || errno != 0 ||
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maxrec <= 0)
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errx(1, "%s: bad line count", optarg);
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break;
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case 's':
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sflag++; /* Show delta as seconds */
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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 'w':
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width = 8;
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break;
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case 'y':
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yflag++;
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break;
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case '?':
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default:
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usage();
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}
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if (sflag && width == 8) usage();
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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(void)
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{
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struct utmp *bp; /* current structure */
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struct stat stb; /* stat of file for size */
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long bl;
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int bytes, wfd;
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char ct[80];
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struct tm *tm;
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time_t t;
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LIST_INIT(&ttylist);
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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(&t);
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buf[0].ut_time = _time_to_int(t);
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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, (off_t)(bl * sizeof(buf)), L_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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doentry(bp);
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}
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t = _int_to_time(buf[0].ut_time);
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tm = localtime(&t);
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(void) strftime(ct, sizeof(ct), "\nwtmp begins %+\n", tm);
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printf("%s", ct);
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}
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/*
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* doentry --
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* process a single wtmp entry
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*/
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void
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doentry(struct utmp *bp)
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{
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struct ttytab *tt, *ttx; /* ttylist entry */
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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 (tt = LIST_FIRST(&ttylist); tt;) {
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LIST_REMOVE(tt, list);
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ttx = tt;
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tt = LIST_NEXT(tt, list);
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free(ttx);
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}
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currentout = -bp->ut_time;
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crmsg = strncmp(bp->ut_name, "shutdown", UT_NAMESIZE) ?
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"crash" : "shutdown";
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/*
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* if we're in snapshot mode, we want to exit if this
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* shutdown/reboot appears while we we are tracking the
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* active range
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*/
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if (snaptime && snapfound)
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exit(0);
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/*
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* don't print shutdown/reboot entries unless flagged for
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*/
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if (!snaptime && want(bp))
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printentry(bp, NULL);
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return;
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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) && !snaptime)
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printentry(bp, NULL);
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return;
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}
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/* find associated tty */
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LIST_FOREACH(tt, &ttylist, list)
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if (!strncmp(tt->tty, bp->ut_line, UT_LINESIZE))
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break;
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if (tt == NULL) {
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/* add new one */
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tt = malloc(sizeof(struct ttytab));
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if (tt == NULL)
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errx(1, "malloc failure");
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tt->logout = currentout;
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strncpy(tt->tty, bp->ut_line, UT_LINESIZE);
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LIST_INSERT_HEAD(&ttylist, tt, list);
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}
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/*
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* print record if not in snapshot mode and wanted
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* or in snapshot mode and in snapshot range
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*/
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if (bp->ut_name[0] && (want(bp) || (bp->ut_time < snaptime &&
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(tt->logout > snaptime || tt->logout < 1)))) {
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snapfound = 1;
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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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printentry(bp, tt);
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}
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tt->logout = bp->ut_time;
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}
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/*
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* printentry --
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* output an entry
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*
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* If `tt' is non-NULL, use it and `crmsg' to print the logout time or
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* logout type (crash/shutdown) as appropriate.
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*/
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void
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printentry(struct utmp *bp, struct ttytab *tt)
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{
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char ct[80];
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struct tm *tm;
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time_t delta; /* time difference */
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time_t t;
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if (maxrec != -1 && !maxrec--)
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exit(0);
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t = _int_to_time(bp->ut_time);
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tm = localtime(&t);
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(void) strftime(ct, sizeof(ct), d_first ?
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(yflag ? "%a %e %b %Y %R" : "%a %e %b %R") :
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(yflag ? "%a %b %e %Y %R" : "%a %b %e %R"), tm);
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printf("%-*.*s %-*.*s %-*.*s %s%c",
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UT_NAMESIZE, UT_NAMESIZE, bp->ut_name,
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UT_LINESIZE, UT_LINESIZE, bp->ut_line,
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UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host,
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ct, tt == NULL ? '\n' : ' ');
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if (tt == NULL)
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return;
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if (!tt->logout) {
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puts(" still logged in");
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return;
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}
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if (tt->logout < 0) {
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tt->logout = -tt->logout;
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printf("- %s", crmsg);
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} else {
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tm = localtime(&tt->logout);
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(void) strftime(ct, sizeof(ct), "%R", tm);
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printf("- %s", ct);
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}
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delta = tt->logout - bp->ut_time;
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if (sflag) {
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printf(" (%8ld)\n", (long)delta);
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} else {
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tm = gmtime(&delta);
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(void) strftime(ct, sizeof(ct), width >= 8 ? "%T" : "%R", tm);
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if (delta < 86400)
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printf(" (%s)\n", ct);
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else
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printf(" (%ld+%s)\n", (long)delta / 86400, ct);
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}
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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(struct utmp *bp)
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{
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ARG *step;
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if (snaptime)
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return (NO);
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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(int type, char *arg)
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{
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ARG *cur;
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if ((cur = malloc(sizeof(ARG))) == NULL)
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errx(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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* 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(char *arg)
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{
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static int first = 1;
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static char *hostdot, name[MAXHOSTNAMELEN];
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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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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(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(8)) == NULL)
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errx(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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* dateconv --
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* Convert the snapshot time in command line given in the format
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* [[CC]YY]MMDDhhmm[.SS]] to a time_t.
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* Derived from atime_arg1() in usr.bin/touch/touch.c
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*/
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time_t
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dateconv(char *arg)
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{
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time_t timet;
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struct tm *t;
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int yearset;
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char *p;
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/* Start with the current time. */
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if (time(&timet) < 0)
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err(1, "time");
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if ((t = localtime(&timet)) == NULL)
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err(1, "localtime");
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/* [[CC]YY]MMDDhhmm[.SS] */
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if ((p = strchr(arg, '.')) == NULL)
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t->tm_sec = 0; /* Seconds defaults to 0. */
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else {
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if (strlen(p + 1) != 2)
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goto terr;
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*p++ = '\0';
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t->tm_sec = ATOI2(p);
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}
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yearset = 0;
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switch (strlen(arg)) {
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case 12: /* CCYYMMDDhhmm */
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t->tm_year = ATOI2(arg);
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t->tm_year *= 100;
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yearset = 1;
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/* FALLTHOUGH */
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case 10: /* YYMMDDhhmm */
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if (yearset) {
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yearset = ATOI2(arg);
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t->tm_year += yearset;
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} else {
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yearset = ATOI2(arg);
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if (yearset < 69)
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t->tm_year = yearset + 2000;
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else
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t->tm_year = yearset + 1900;
|
|
}
|
|
t->tm_year -= 1900; /* Convert to UNIX time. */
|
|
/* FALLTHROUGH */
|
|
case 8: /* MMDDhhmm */
|
|
t->tm_mon = ATOI2(arg);
|
|
--t->tm_mon; /* Convert from 01-12 to 00-11 */
|
|
t->tm_mday = ATOI2(arg);
|
|
t->tm_hour = ATOI2(arg);
|
|
t->tm_min = ATOI2(arg);
|
|
break;
|
|
case 4: /* hhmm */
|
|
t->tm_hour = ATOI2(arg);
|
|
t->tm_min = ATOI2(arg);
|
|
break;
|
|
default:
|
|
goto terr;
|
|
}
|
|
t->tm_isdst = -1; /* Figure out DST. */
|
|
timet = mktime(t);
|
|
if (timet == -1)
|
|
terr: errx(1,
|
|
"out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
|
|
return timet;
|
|
}
|
|
|
|
|
|
/*
|
|
* onintr --
|
|
* on interrupt, we inform the user how far we've gotten
|
|
*/
|
|
void
|
|
onintr(int signo)
|
|
{
|
|
char ct[80];
|
|
struct tm *tm;
|
|
time_t t = _int_to_time(buf[0].ut_time);
|
|
|
|
tm = localtime(&t);
|
|
(void) strftime(ct, sizeof(ct),
|
|
d_first ? "%a %e %b %R" : "%a %b %e %R",
|
|
tm);
|
|
printf("\ninterrupted %s\n", ct);
|
|
if (signo == SIGINT)
|
|
exit(1);
|
|
(void)fflush(stdout); /* fix required for rsh */
|
|
}
|