d06b9ed56d
going on, they can't have been clear enough. (And if xtos misread it, so will anyone else passing by, and then someone will "fix" it...) Hopefully this will help. Maybe it should be changed to use memcpy instead of strncpy after all.
335 lines
8.4 KiB
C
335 lines
8.4 KiB
C
/* $NetBSD: utmpentry.c,v 1.13 2008/03/08 22:41:03 dholland 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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* 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 NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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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 1.13 2008/03/08 22:41:03 dholland 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) ((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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freeutentries(struct utmpentry *ep)
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{
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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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if (ep == ehead) {
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ehead = NULL;
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numutmp = 0;
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}
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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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}
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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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