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320 lines
7.5 KiB
C
320 lines
7.5 KiB
C
/* $OpenBSD: who.c,v 1.31 2021/11/10 15:06:24 schwarze Exp $ */
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/* $NetBSD: who.c,v 1.4 1994/12/07 04:28:49 jtc 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. 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/types.h>
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#include <sys/stat.h>
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#include <paths.h>
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#include <pwd.h>
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#include <utmp.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <time.h>
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#include <err.h>
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void output(struct utmp *);
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void output_labels(void);
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void who_am_i(FILE *);
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void usage(void);
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FILE *file(char *);
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int only_current_term; /* show info about the current terminal only */
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int show_term; /* show term state */
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int show_idle; /* show idle time */
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int show_labels; /* show column labels */
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int show_quick; /* quick, names only */
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#define NAME_WIDTH 8
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#define HOST_WIDTH 45
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int hostwidth = HOST_WIDTH;
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char *mytty;
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int
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main(int argc, char *argv[])
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{
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struct utmp usr;
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FILE *ufp;
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char *t;
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int c;
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if (pledge("stdio unveil rpath getpw", NULL) == -1)
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err(1, "pledge");
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if ((mytty = ttyname(0))) {
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/* strip any directory component */
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if ((t = strrchr(mytty, '/')))
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mytty = t + 1;
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}
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only_current_term = show_term = show_idle = show_labels = 0;
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show_quick = 0;
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while ((c = getopt(argc, argv, "HmqTu")) != -1) {
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switch (c) {
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case 'H':
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show_labels = 1;
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break;
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case 'm':
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only_current_term = 1;
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break;
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case 'q':
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show_quick = 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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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 (show_quick) {
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only_current_term = show_term = show_idle = show_labels = 0;
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}
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if (show_term)
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hostwidth -= 2;
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if (show_idle)
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hostwidth -= 6;
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if (show_labels)
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output_labels();
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if (unveil(_PATH_UTMP, "r") == -1)
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err(1, "unveil %s", _PATH_UTMP);
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if (show_term || show_idle) {
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if (unveil(_PATH_DEV, "r") == -1)
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err(1, "unveil %s", _PATH_DEV);
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}
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switch (argc) {
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case 0: /* who */
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if (pledge("stdio rpath getpw", NULL) == -1)
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err(1, "pledge");
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ufp = file(_PATH_UTMP);
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if (only_current_term) {
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who_am_i(ufp);
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} else if (show_quick) {
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int count = 0;
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while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1) {
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if (*usr.ut_name && *usr.ut_line) {
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(void)printf("%-*.*s ", NAME_WIDTH,
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UT_NAMESIZE, usr.ut_name);
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if ((++count % 8) == 0)
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(void) printf("\n");
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}
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}
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if (count % 8)
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(void) printf("\n");
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(void) printf ("# users=%d\n", count);
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} else {
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/* only entries with both name and line fields */
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while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1)
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if (*usr.ut_name && *usr.ut_line)
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output(&usr);
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}
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break;
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case 1: /* who utmp_file */
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if (unveil(*argv, "r") == -1)
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err(1, "unveil %s", *argv);
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if (pledge("stdio rpath getpw", NULL) == -1)
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err(1, "pledge");
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ufp = file(*argv);
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if (only_current_term) {
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who_am_i(ufp);
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} else if (show_quick) {
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int count = 0;
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while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1) {
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if (*usr.ut_name && *usr.ut_line) {
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(void)printf("%-*.*s ", NAME_WIDTH,
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UT_NAMESIZE, usr.ut_name);
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if ((++count % 8) == 0)
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(void) printf("\n");
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}
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}
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if (count % 8)
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(void) printf("\n");
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(void) printf ("# users=%d\n", count);
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} else {
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/* all entries */
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while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1)
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output(&usr);
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}
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break;
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case 2: /* who am i */
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if (pledge("stdio rpath getpw", NULL) == -1)
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err(1, "pledge");
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ufp = file(_PATH_UTMP);
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who_am_i(ufp);
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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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void
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who_am_i(FILE *ufp)
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{
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struct utmp usr;
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struct passwd *pw;
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/* search through the utmp and find an entry for this tty */
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if (mytty) {
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while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1)
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if (*usr.ut_name && !strcmp(usr.ut_line, mytty)) {
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output(&usr);
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return;
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}
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/* well, at least we know what the tty is */
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(void)strncpy(usr.ut_line, mytty, UT_LINESIZE);
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} else
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(void)strncpy(usr.ut_line, "tty??", UT_LINESIZE);
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pw = getpwuid(getuid());
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(void)strncpy(usr.ut_name, pw ? pw->pw_name : "?", UT_NAMESIZE);
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(void)time(&usr.ut_time);
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*usr.ut_host = '\0';
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output(&usr);
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}
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void
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output(struct utmp *up)
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{
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struct stat sb;
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char line[sizeof(_PATH_DEV) + sizeof (up->ut_line)];
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char state = '?';
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static time_t now = 0;
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time_t 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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memset(line, 0, sizeof line);
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strlcpy(line, _PATH_DEV, sizeof line);
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strlcat(line, up->ut_line, sizeof line);
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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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} else {
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state = '?';
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idle = 0;
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}
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}
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(void)printf("%-*.*s ", NAME_WIDTH, UT_NAMESIZE, up->ut_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 ", UT_LINESIZE, UT_LINESIZE, up->ut_line);
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(void)printf("%.12s ", ctime(&up->ut_time) + 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("%02d:%02d ",
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((int)idle / (60 * 60)),
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((int)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 (*up->ut_host)
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printf(" (%.*s)", hostwidth, up->ut_host);
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(void)putchar('\n');
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}
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void
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output_labels(void)
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{
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(void)printf("%-*.*s ", NAME_WIDTH, UT_NAMESIZE, "USER");
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if (show_term)
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(void)printf("S ");
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(void)printf("%-*.*s ", UT_LINESIZE, UT_LINESIZE, "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(" %.*s", hostwidth, "FROM");
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(void)putchar('\n');
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}
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FILE *
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file(char *name)
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{
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FILE *ufp;
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if (!(ufp = fopen(name, "r"))) {
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err(1, "%s", name);
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/* NOTREACHED */
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}
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if (show_term || show_idle) {
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if (pledge("stdio rpath getpw", NULL) == -1)
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err(1, "pledge");
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} else {
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if (pledge("stdio getpw", NULL) == -1)
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err(1, "pledge");
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}
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return(ufp);
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}
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void
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usage(void)
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{
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(void)fprintf(stderr, "usage: who [-HmqTu] [file]\n who am i\n");
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exit(1);
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}
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