561f61e25d
Basically there are three major things I changed about last(1): - It should use ut_type instead of determining by hand what type of record was given. - It should now keep track of ut_id's instead of TTYs. This means the ttylist has been renamed to the idlist, storing all the ut_id's it has processed until the next reboot. - I've removed the signal handler. Because our wtmp is rotated so often, it makes little sense. Even on a simple piece of hardware it should be capable of grinding through megabytes of logs in a second.
558 lines
14 KiB
C
558 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 <timeconv.h>
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#include <unistd.h>
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#include <utmpx.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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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(idlisthead, idtab) idlist;
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struct idtab {
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time_t logout; /* log out time */
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char id[sizeof ((struct utmpx *)0)->ut_id]; /* identifier */
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LIST_ENTRY(idtab) list;
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};
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static const char *crmsg; /* cause of last reboot */
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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 const char *file = NULL; /* 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 utmpx *);
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void hostconv(char *);
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void printentry(struct utmpx *, struct idtab *);
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char *ttyconv(char *);
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int want(struct utmpx *);
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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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#define MAXUTXENTRIES 1024
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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 utmpx buf[MAXUTXENTRIES];
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struct utmpx *ut;
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static unsigned int first = 0, amount = 0;
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time_t t;
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char ct[80];
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struct tm *tm;
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LIST_INIT(&idlist);
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(void)time(&t);
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/* Load the last entries from the file. */
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if (setutxdb(UTXDB_LOG, file) != 0)
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err(1, "%s", file);
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while ((ut = getutxent()) != NULL) {
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memcpy(&buf[(first + amount) % MAXUTXENTRIES], ut, sizeof *ut);
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if (amount == MAXUTXENTRIES)
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first++;
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else
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amount++;
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if (t > ut->ut_tv.tv_sec)
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t = ut->ut_tv.tv_sec;
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}
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endutxent();
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/* Display them in reverse order. */
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while (amount > 0)
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doentry(&buf[(first + amount--) % MAXUTXENTRIES]);
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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 utmpx *bp)
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{
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struct idtab *tt, *ttx; /* idlist entry */
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/* the machine stopped */
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if (bp->ut_type == BOOT_TIME || bp->ut_type == SHUTDOWN_TIME) {
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/* everybody just logged out */
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for (tt = LIST_FIRST(&idlist); 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_tv.tv_sec;
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crmsg = bp->ut_type != SHUTDOWN_TIME ?
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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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/* date got set */
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if (bp->ut_type == OLD_TIME || bp->ut_type == NEW_TIME) {
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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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if (bp->ut_type != USER_PROCESS && bp->ut_type != DEAD_PROCESS)
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return;
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/* find associated identifier */
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LIST_FOREACH(tt, &idlist, list)
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if (!memcmp(tt->id, bp->ut_id, sizeof bp->ut_id))
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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 idtab));
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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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memcpy(tt->id, bp->ut_id, sizeof bp->ut_id);
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LIST_INSERT_HEAD(&idlist, 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_type == USER_PROCESS && (want(bp) ||
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(bp->ut_tv.tv_sec < snaptime &&
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(tt->logout > snaptime || tt->logout < 1)))) {
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snapfound = 1;
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printentry(bp, tt);
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}
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tt->logout = bp->ut_tv.tv_sec;
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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 utmpx *bp, struct idtab *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 = bp->ut_tv.tv_sec;
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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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switch (bp->ut_type) {
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case BOOT_TIME:
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printf("%-42s", "boot time");
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break;
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case SHUTDOWN_TIME:
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printf("%-42s", "shutdown time");
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break;
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case OLD_TIME:
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printf("%-42s", "old time");
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break;
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case NEW_TIME:
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printf("%-42s", "new time");
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break;
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case USER_PROCESS:
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printf("%-10s %-8s %-22.22s",
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bp->ut_user, bp->ut_line, bp->ut_host);
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break;
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}
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printf(" %s%c", 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_tv.tv_sec;
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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 utmpx *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 (!strcasecmp(step->name, bp->ut_host))
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return (YES);
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break;
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case TTY_TYPE:
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if (!strcmp(step->name, bp->ut_line))
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return (YES);
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break;
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case USER_TYPE:
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if (!strcmp(step->name, bp->ut_user))
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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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/* FALLTHROUGH */
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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;
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|
}
|
|
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;
|
|
}
|