442 lines
10 KiB
C
442 lines
10 KiB
C
/* $NetBSD: who.c,v 1.9 2002/07/28 21:46:34 christos Exp $ */
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/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Michael Fischbein.
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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) 1989, 1993\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[] = "@(#)who.c 8.1 (Berkeley) 6/6/93";
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#endif
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__RCSID("$NetBSD: who.c,v 1.9 2002/07/28 21:46:34 christos Exp $");
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <locale.h>
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#include <pwd.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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#ifdef SUPPORT_UTMP
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#include <utmp.h>
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#endif
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#ifdef SUPPORT_UTMPX
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#include <utmpx.h>
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#endif
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struct entry {
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char name[65];
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char line[65];
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char host[257];
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time_t time;
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struct entry *next;
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};
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static void output_labels(void);
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static void who_am_i(const char *, int);
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static void usage(void);
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static void process(const char *, int);
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#ifdef SUPPORT_UTMP
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static void getentry(struct entry *, struct utmp *);
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#endif
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#ifdef SUPPORT_UTMPX
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static void getentryx(struct entry *, struct utmpx *);
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#endif
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#if defined(SUPPORT_UTMPX) && defined(SUPPORT_UTMP)
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static int setup(const char *);
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static void adjust_size(struct entry *e);
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#endif
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static void print(const char *, const char *, time_t, const char *);
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int main(int, char **);
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static int show_term; /* show term state */
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static int show_idle; /* show idle time */
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static int maxname = 8, maxline = 8, maxhost = 16;
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int
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main(int argc, char **argv)
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{
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int c, only_current_term, show_labels;
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setlocale(LC_ALL, "");
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only_current_term = show_term = show_idle = show_labels = 0;
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while ((c = getopt(argc, argv, "mTuH")) != -1) {
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switch (c) {
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case 'm':
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only_current_term = 1;
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break;
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case 'T':
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show_term = 1;
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break;
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case 'u':
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show_idle = 1;
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break;
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case 'H':
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show_labels = 1;
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break;
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default:
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usage();
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/* NOTREACHED */
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}
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}
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argc -= optind;
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argv += optind;
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if (chdir("/dev")) {
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err(1, "cannot change directory to /dev");
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/* NOTREACHED */
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}
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switch (argc) {
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case 0: /* who */
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if (only_current_term) {
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who_am_i(NULL, show_labels);
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} else {
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process(NULL, show_labels);
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}
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break;
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case 1: /* who utmp_file */
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if (only_current_term) {
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who_am_i(*argv, show_labels);
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} else {
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process(*argv, show_labels);
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}
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break;
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case 2: /* who am i */
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who_am_i(NULL, show_labels);
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break;
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default:
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usage();
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/* NOTREACHED */
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}
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exit(0);
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}
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#if defined(SUPPORT_UTMPX) && defined(SUPPORT_UTMP)
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static void
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adjust_size(struct entry *e)
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{
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int max;
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if ((max = strlen(e->name)) > maxname)
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maxname = max;
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if ((max = strlen(e->line)) > maxline)
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maxline = max;
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if ((max = strlen(e->host)) > maxhost)
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maxhost = max;
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}
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static int
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setup(const char *fname)
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{
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int what = 3;
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if (fname == NULL) {
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#ifdef SUPPORT_UTMPX
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setutent();
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#endif
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#ifdef SUPPORT_UTMP
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setutxent();
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#endif
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} else {
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size_t len = strlen(fname);
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if (len == 0)
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errx(1, "Filename cannot be 0 length.");
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what = fname[len - 1] == 'x' ? 1 : 2;
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if (what == 1) {
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#ifdef SUPPORT_UTMPX
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if (utmpxname(fname) == 0)
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err(1, "Cannot open `%s'", fname);
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#else
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errx(1, "utmpx support not compiled in");
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#endif
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} else {
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#ifdef SUPPORT_UTMPX
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if (utmpname(fname) == 0)
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err(1, "Cannot open `%s'", fname);
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#else
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errx(1, "utmp support not compiled in");
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#endif
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}
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}
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return what;
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}
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#endif
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static void
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who_am_i(const char *fname, int show_labels)
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{
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#ifdef SUPPORT_UTMPX
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struct utmpx *utx;
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#endif
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#ifdef SUPPORT_UTMP
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struct utmp *ut;
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#endif
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struct passwd *pw;
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char *p;
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char *t;
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time_t now;
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#if defined(SUPPORT_UTMP) && defined(SUPPORT_UTMPX)
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int what = setup(fname);
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#endif
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/* search through the utmp and find an entry for this tty */
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if ((p = ttyname(STDIN_FILENO)) != NULL) {
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/* strip any directory component */
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if ((t = strrchr(p, '/')) != NULL)
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p = t + 1;
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#ifdef SUPPORT_UTMPX
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while ((what & 1) && (utx = getutxent()) != NULL)
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if (utx->ut_type == USER_PROCESS &&
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!strcmp(utx->ut_line, p)) {
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struct entry e;
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getentryx(&e, utx);
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if (show_labels)
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output_labels();
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print(e.name, e.line, e.time, e.host);
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return;
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}
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#endif
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#ifdef SUPPORT_UTMP
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while ((what & 2) && (ut = getutent()) != NULL)
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if (!strcmp(ut->ut_line, p)) {
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struct entry e;
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getentry(&e, ut);
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if (show_labels)
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output_labels();
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print(e.name, e.line, e.time, e.host);
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return;
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}
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#endif
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} else
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p = "tty??";
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(void)time(&now);
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pw = getpwuid(getuid());
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if (show_labels)
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output_labels();
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print(pw ? pw->pw_name : "?", p, now, "");
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}
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static void
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process(const char *fname, int show_labels)
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{
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#ifdef SUPPORT_UTMPX
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struct utmpx *utx;
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#endif
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#ifdef SUPPORT_UTMP
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struct utmp *ut;
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#endif
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struct entry *ep, *ehead = NULL;
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#if defined(SUPPORT_UTMP) && defined(SUPPORT_UTMPX)
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int what = setup(fname);
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struct entry **nextp = &ehead;
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#endif
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#ifdef SUPPORT_UTMPX
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while ((what & 1) && (utx = getutxent()) != NULL) {
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if (fname == NULL && utx->ut_type != USER_PROCESS)
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continue;
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if ((ep = calloc(1, sizeof(struct entry))) == NULL)
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err(1, NULL);
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getentryx(ep, utx);
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*nextp = ep;
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nextp = &(ep->next);
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}
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#endif
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#ifdef SUPPORT_UTMP
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while ((what & 2) && (ut = getutent()) != NULL) {
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if (fname == NULL && (*ut->ut_name == '\0' ||
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*ut->ut_line == '\0'))
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continue;
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/* Don't process entries that we have utmpx for */
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for (ep = ehead; ep != NULL; ep = ep->next) {
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if (strncmp(ep->line, ut->ut_line,
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sizeof(ut->ut_line)) == 0)
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break;
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}
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if (ep != NULL)
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continue;
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if ((ep = calloc(1, sizeof(struct entry))) == NULL)
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err(1, NULL);
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getentry(ep, ut);
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*nextp = ep;
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nextp = &(ep->next);
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}
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#endif
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#if defined(SUPPORT_UTMP) && defined(SUPPORT_UTMPX)
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if (ehead != NULL) {
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struct entry *from = ehead, *save;
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ehead = NULL;
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while (from != NULL) {
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for (nextp = &ehead;
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(*nextp) && strcmp(from->line, (*nextp)->line) > 0;
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nextp = &(*nextp)->next)
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continue;
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save = from;
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from = from->next;
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save->next = *nextp;
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*nextp = save;
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}
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}
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#endif
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if (show_labels)
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output_labels();
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for (ep = ehead; ep != NULL; ep = ep->next)
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print(ep->name, ep->line, ep->time, ep->host);
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}
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#ifdef SUPPORT_UTMP
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static void
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getentry(struct entry *e, struct utmp *up)
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{
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(void)strncpy(e->name, up->ut_name, sizeof(up->ut_name));
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e->name[sizeof(e->name) - 1] = '\0';
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(void)strncpy(e->line, up->ut_line, sizeof(up->ut_line));
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e->line[sizeof(e->line) - 1] = '\0';
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(void)strncpy(e->host, up->ut_host, sizeof(up->ut_host));
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e->name[sizeof(e->host) - 1] = '\0';
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e->time = up->ut_time;
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adjust_size(e);
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}
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#endif
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#ifdef SUPPORT_UTMPX
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static void
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getentryx(struct entry *e, struct utmpx *up)
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{
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(void)strncpy(e->name, up->ut_name, sizeof(up->ut_name));
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e->name[sizeof(e->name) - 1] = '\0';
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(void)strncpy(e->line, up->ut_line, sizeof(up->ut_line));
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e->line[sizeof(e->line) - 1] = '\0';
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(void)strncpy(e->host, up->ut_host, sizeof(up->ut_host));
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e->name[sizeof(e->host) - 1] = '\0';
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e->time = (time_t)up->ut_tv.tv_sec;
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adjust_size(e);
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}
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#endif
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static void
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print(const char *name, const char *line, time_t t, const char *host)
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{
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struct stat sb;
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char state;
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static time_t now = 0;
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time_t idle;
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state = '?';
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idle = 0;
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if (show_term || show_idle) {
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if (now == 0)
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time(&now);
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if (stat(line, &sb) == 0) {
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state = (sb.st_mode & 020) ? '+' : '-';
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idle = now - sb.st_atime;
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}
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}
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(void)printf("%-*.*s ", maxname, maxname, name);
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if (show_term) {
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(void)printf("%c ", state);
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}
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(void)printf("%-*.*s ", maxline, maxline, line);
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(void)printf("%.12s ", ctime(&t) + 4);
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if (show_idle) {
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if (idle < 60)
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(void)printf(" . ");
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else if (idle < (24 * 60 * 60))
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(void)printf("%02ld:%02ld ",
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(long)(idle / (60 * 60)),
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(long)(idle % (60 * 60)) / 60);
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else
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(void)printf(" old ");
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}
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if (*host)
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printf("\t(%.*s)", maxhost, host);
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(void)putchar('\n');
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}
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static void
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output_labels()
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{
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(void)printf("%-*.*s ", maxname, maxname, "USER");
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if (show_term)
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(void)printf("S ");
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(void)printf("%-*.*s ", maxline, maxline, "LINE");
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(void)printf("WHEN ");
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if (show_idle)
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(void)printf("IDLE ");
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(void)printf("\t%.*s", maxhost, "FROM");
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(void)putchar('\n');
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}
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static void
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usage()
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{
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(void)fprintf(stderr, "Usage: %s [-mTuH] [ file ]\n %s am i\n",
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getprogname(), getprogname());
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exit(1);
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}
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