329 lines
8 KiB
C
329 lines
8 KiB
C
/* $NetBSD: utmpentry.c,v 1.17 2009/05/01 14:26:10 christos Exp $ */
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/*-
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* Copyright (c) 2002 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: utmpentry.c,v 1.17 2009/05/01 14:26:10 christos Exp $");
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#endif
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#include <sys/stat.h>
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#include <time.h>
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#include <string.h>
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#include <err.h>
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#include <stdlib.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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#include "utmpentry.h"
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/* Fail the compile if x is not true, by constructing an illegal type. */
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#define COMPILE_ASSERT(x) /*LINTED null effect */ \
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((void)sizeof(struct { unsigned : ((x) ? 1 : -1); }))
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#ifdef SUPPORT_UTMP
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static void getentry(struct utmpentry *, struct utmp *);
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static struct timespec utmptime = {0, 0};
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#endif
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#ifdef SUPPORT_UTMPX
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static void getentryx(struct utmpentry *, struct utmpx *);
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static struct timespec utmpxtime = {0, 0};
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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 utmpentry *e);
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#endif
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int maxname = 8, maxline = 8, maxhost = 16;
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int etype = 1 << USER_PROCESS;
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static int numutmp = 0;
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static struct utmpentry *ehead;
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#if defined(SUPPORT_UTMPX) || defined(SUPPORT_UTMP)
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static void
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adjust_size(struct utmpentry *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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struct stat st;
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const char *sfname;
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if (fname == NULL) {
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#ifdef SUPPORT_UTMPX
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setutxent();
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#endif
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#ifdef SUPPORT_UTMP
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setutent();
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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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warnx("Cannot set utmpx file to `%s'",
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fname);
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#else
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warnx("utmpx support not compiled in");
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#endif
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} else {
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#ifdef SUPPORT_UTMP
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if (utmpname(fname) == 0)
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warnx("Cannot set utmp file to `%s'",
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fname);
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#else
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warnx("utmp support not compiled in");
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#endif
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}
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}
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#ifdef SUPPORT_UTMPX
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if (what & 1) {
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sfname = fname ? fname : _PATH_UTMPX;
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if (stat(sfname, &st) == -1) {
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warn("Cannot stat `%s'", sfname);
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what &= ~1;
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} else {
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if (timespeccmp(&st.st_mtimespec, &utmpxtime, >))
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utmpxtime = st.st_mtimespec;
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else
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what &= ~1;
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}
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}
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#endif
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#ifdef SUPPORT_UTMP
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if (what & 2) {
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sfname = fname ? fname : _PATH_UTMP;
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if (stat(sfname, &st) == -1) {
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warn("Cannot stat `%s'", sfname);
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what &= ~2;
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} else {
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if (timespeccmp(&st.st_mtimespec, &utmptime, >))
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utmptime = st.st_mtimespec;
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else
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what &= ~2;
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}
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}
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#endif
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return what;
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}
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#endif
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void
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endutentries(void)
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{
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struct utmpentry *ep;
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#ifdef SUPPORT_UTMP
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timespecclear(&utmptime);
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#endif
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#ifdef SUPPORT_UTMPX
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timespecclear(&utmpxtime);
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#endif
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ep = ehead;
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while (ep) {
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struct utmpentry *sep = ep;
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ep = ep->next;
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free(sep);
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}
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ehead = NULL;
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numutmp = 0;
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}
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int
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getutentries(const char *fname, struct utmpentry **epp)
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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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#if defined(SUPPORT_UTMP) || defined(SUPPORT_UTMPX)
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struct utmpentry *ep;
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int what = setup(fname);
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struct utmpentry **nextp = &ehead;
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switch (what) {
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case 0:
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/* No updates */
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*epp = ehead;
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return numutmp;
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default:
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/* Need to re-scan */
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ehead = NULL;
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numutmp = 0;
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}
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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 && ((1 << utx->ut_type) & etype) == 0)
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continue;
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if ((ep = calloc(1, sizeof(struct utmpentry))) == NULL) {
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warn(NULL);
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return 0;
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}
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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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if ((etype & (1 << USER_PROCESS)) != 0) {
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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(*ep))) == NULL) {
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warn(NULL);
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return 0;
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}
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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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}
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#endif
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numutmp = 0;
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#if defined(SUPPORT_UTMP) || defined(SUPPORT_UTMPX)
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if (ehead != NULL) {
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struct utmpentry *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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numutmp++;
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}
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}
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*epp = ehead;
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return numutmp;
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#else
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*epp = NULL;
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return 0;
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#endif
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}
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#ifdef SUPPORT_UTMP
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static void
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getentry(struct utmpentry *e, struct utmp *up)
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{
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COMPILE_ASSERT(sizeof(e->name) > sizeof(up->ut_name));
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COMPILE_ASSERT(sizeof(e->line) > sizeof(up->ut_line));
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COMPILE_ASSERT(sizeof(e->host) > sizeof(up->ut_host));
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/*
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* e has just been calloc'd. We don't need to clear it or
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* append null-terminators, because its length is strictly
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* greater than the source string. Use strncpy to _read_
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* up->ut_* because they may not be terminated. For this
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* reason we use the size of the _source_ as the length
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* argument.
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*/
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(void)strncpy(e->name, up->ut_name, sizeof(up->ut_name));
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(void)strncpy(e->line, up->ut_line, sizeof(up->ut_line));
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(void)strncpy(e->host, up->ut_host, sizeof(up->ut_host));
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e->tv.tv_sec = up->ut_time;
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e->tv.tv_usec = 0;
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e->pid = 0;
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e->term = 0;
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e->exit = 0;
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e->sess = 0;
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e->type = USER_PROCESS;
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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 utmpentry *e, struct utmpx *up)
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{
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COMPILE_ASSERT(sizeof(e->name) > sizeof(up->ut_name));
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COMPILE_ASSERT(sizeof(e->line) > sizeof(up->ut_line));
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COMPILE_ASSERT(sizeof(e->host) > sizeof(up->ut_host));
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/*
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* e has just been calloc'd. We don't need to clear it or
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* append null-terminators, because its length is strictly
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* greater than the source string. Use strncpy to _read_
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* up->ut_* because they may not be terminated. For this
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* reason we use the size of the _source_ as the length
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* argument.
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*/
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(void)strncpy(e->name, up->ut_name, sizeof(up->ut_name));
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(void)strncpy(e->line, up->ut_line, sizeof(up->ut_line));
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(void)strncpy(e->host, up->ut_host, sizeof(up->ut_host));
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e->tv = up->ut_tv;
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e->pid = up->ut_pid;
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e->term = up->ut_exit.e_termination;
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e->exit = up->ut_exit.e_exit;
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e->sess = up->ut_session;
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e->type = up->ut_type;
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adjust_size(e);
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}
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#endif
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