NetBSD/usr.bin/who/who.c

390 lines
8.7 KiB
C

/* $NetBSD: who.c,v 1.23 2008/07/24 15:35:41 christos Exp $ */
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Michael Fischbein.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1989, 1993\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)who.c 8.1 (Berkeley) 6/6/93";
#endif
__RCSID("$NetBSD: who.c,v 1.23 2008/07/24 15:35:41 christos Exp $");
#endif /* not lint */
#include <sys/types.h>
#include <sys/stat.h>
#include <err.h>
#include <locale.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#ifdef SUPPORT_UTMP
#include <utmp.h>
#endif
#ifdef SUPPORT_UTMPX
#include <utmpx.h>
#endif
#include "utmpentry.h"
static void output_labels(void);
static void who_am_i(const char *, int);
static void usage(void) __dead;
static void process(const char *, int);
static void eprint(const struct utmpentry *);
static void print(const char *, const char *, time_t, const char *, pid_t pid,
uint16_t term, uint16_t xit, uint16_t sess, uint16_t type);
static void quick(const char *);
static int show_term; /* show term state */
static int show_idle; /* show idle time */
static int show_details; /* show exit status etc. */
struct ut_type_names {
int type;
const char *name;
} ut_type_names[] = {
#ifdef SUPPORT_UTMPX
{ EMPTY, "empty" },
{ RUN_LVL, "run level" },
{ BOOT_TIME, "boot time" },
{ OLD_TIME, "old time" },
{ NEW_TIME, "new time" },
{ INIT_PROCESS, "init process" },
{ LOGIN_PROCESS, "login process" },
{ USER_PROCESS, "user process" },
{ DEAD_PROCESS, "dead process" },
#if defined(_NETBSD_SOURCE)
{ ACCOUNTING, "accounting" },
{ SIGNATURE, "signature" },
{ DOWN_TIME, "down time" },
#endif /* _NETBSD_SOURCE */
#endif /* SUPPORT_UTMPX */
{ -1, "unknown" }
};
int
main(int argc, char *argv[])
{
int c, only_current_term, show_labels, quick_mode, default_mode;
int et = 0;
setlocale(LC_ALL, "");
only_current_term = show_term = show_idle = show_labels = 0;
quick_mode = default_mode = 0;
while ((c = getopt(argc, argv, "abdHlmpqrsTtuv")) != -1) {
switch (c) {
case 'a':
et = -1;
show_idle = show_details = 1;
break;
case 'b':
et |= (1 << BOOT_TIME);
break;
case 'd':
et |= (1 << DEAD_PROCESS);
break;
case 'H':
show_labels = 1;
break;
case 'l':
et |= (1 << LOGIN_PROCESS);
break;
case 'm':
only_current_term = 1;
break;
case 'p':
et |= (1 << INIT_PROCESS);
break;
case 'q':
quick_mode = 1;
break;
case 'r':
et |= (1 << RUN_LVL);
break;
case 's':
default_mode = 1;
break;
case 'T':
show_term = 1;
break;
case 't':
et |= (1 << NEW_TIME);
break;
case 'u':
show_idle = 1;
break;
case 'v':
show_details = 1;
break;
default:
usage();
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
if (et != 0)
etype = et;
if (chdir("/dev")) {
err(EXIT_FAILURE, "cannot change directory to /dev");
/* NOTREACHED */
}
if (default_mode)
only_current_term = show_term = show_idle = 0;
switch (argc) {
case 0: /* who */
if (quick_mode) {
quick(NULL);
} else if (only_current_term) {
who_am_i(NULL, show_labels);
} else {
process(NULL, show_labels);
}
break;
case 1: /* who utmp_file */
if (quick_mode) {
quick(*argv);
} else if (only_current_term) {
who_am_i(*argv, show_labels);
} else {
process(*argv, show_labels);
}
break;
case 2: /* who am i */
who_am_i(NULL, show_labels);
break;
default:
usage();
/* NOTREACHED */
}
return 0;
}
static char *
strrstr(const char *str, const char *pat)
{
const char *estr;
size_t len;
if (*pat == '\0')
return __UNCONST(str);
len = strlen(pat);
for (estr = str + strlen(str); str < estr; estr--)
if (strncmp(estr, pat, len) == 0)
return __UNCONST(estr);
return NULL;
}
static void
who_am_i(const char *fname, int show_labels)
{
struct passwd *pw;
const char *p;
char *t;
time_t now;
struct utmpentry *ehead, *ep;
/* search through the utmp and find an entry for this tty */
if ((p = ttyname(STDIN_FILENO)) != NULL) {
/* strip directory prefixes for ttys */
if ((t = strrstr(p, "/pts/")) != NULL ||
(t = strrchr(p, '/')) != NULL)
p = t + 1;
(void)getutentries(fname, &ehead);
for (ep = ehead; ep; ep = ep->next)
if (strcmp(ep->line, p) == 0) {
if (show_labels)
output_labels();
eprint(ep);
return;
}
} else
p = "tty??";
(void)time(&now);
pw = getpwuid(getuid());
if (show_labels)
output_labels();
print(pw ? pw->pw_name : "?", p, now, "", getpid(), 0, 0, 0, 0);
}
static void
process(const char *fname, int show_labels)
{
struct utmpentry *ehead, *ep;
(void)getutentries(fname, &ehead);
if (show_labels)
output_labels();
for (ep = ehead; ep != NULL; ep = ep->next)
eprint(ep);
}
static void
eprint(const struct utmpentry *ep)
{
print(ep->name, ep->line, (time_t)ep->tv.tv_sec, ep->host, ep->pid,
ep->term, ep->exit, ep->sess, ep->type);
}
static void
print(const char *name, const char *line, time_t t, const char *host,
pid_t pid, uint16_t term, uint16_t xit, uint16_t sess, uint16_t type)
{
struct stat sb;
char state;
static time_t now = 0;
time_t idle;
const char *types = NULL;
size_t i;
state = '?';
idle = 0;
for (i = 0; ut_type_names[i].type >= 0; i++) {
types = ut_type_names[i].name;
if (ut_type_names[i].type == type)
break;
}
if (show_term || show_idle) {
if (now == 0)
time(&now);
if (stat(line, &sb) == 0) {
state = (sb.st_mode & 020) ? '+' : '-';
idle = now - sb.st_atime;
}
}
(void)printf("%-*.*s ", maxname, maxname, name);
if (show_term)
(void)printf("%c ", state);
(void)printf("%-*.*s ", maxline, maxline, line);
(void)printf("%.12s ", ctime(&t) + 4);
if (show_idle) {
if (idle < 60)
(void)printf(" . ");
else if (idle < (24 * 60 * 60))
(void)printf("%02ld:%02ld ",
(long)(idle / (60 * 60)),
(long)(idle % (60 * 60)) / 60);
else
(void)printf(" old ");
(void)printf("\t%6d", pid);
if (show_details) {
if (type == RUN_LVL)
(void)printf("\tnew=%c old=%c", term, xit);
else
(void)printf("\tterm=%d exit=%d", term, xit);
(void)printf(" sess=%d", sess);
(void)printf(" type=%s ", types);
}
}
if (*host)
(void)printf("\t(%.*s)", maxhost, host);
(void)putchar('\n');
}
static void
output_labels(void)
{
(void)printf("%-*.*s ", maxname, maxname, "USER");
if (show_term)
(void)printf("S ");
(void)printf("%-*.*s ", maxline, maxline, "LINE");
(void)printf("WHEN ");
if (show_idle) {
(void)printf("IDLE ");
(void)printf("\t PID");
(void)printf("\tCOMMENT");
}
(void)putchar('\n');
}
static void
quick(const char *fname)
{
struct utmpentry *ehead, *ep;
int num = 0;
(void)getutentries(fname, &ehead);
for (ep = ehead; ep != NULL; ep = ep->next) {
(void)printf("%-*s ", maxname, ep->name);
if ((++num % 8) == 0)
(void)putchar('\n');
}
if (num % 8)
(void)putchar('\n');
(void)printf("# users = %d\n", num);
}
static void
usage(void)
{
(void)fprintf(stderr, "Usage: %s [-abdHlmqrsTtuv] [file]\n\t%s am i\n",
getprogname(), getprogname());
exit(EXIT_FAILURE);
}