/*      $NetBSD: logutmp.c,v 1.12 2011/09/16 16:13:17 plunky Exp $      */

/*
 * Portions Copyright (c) 1988, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * 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.
 */

/*
 * Portions Copyright (c) 1996, Jason Downs.  All rights reserved.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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 AUTHOR(S) 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
__RCSID("$NetBSD: logutmp.c,v 1.12 2011/09/16 16:13:17 plunky Exp $");
#endif /* not lint */

#include <sys/types.h>
#include <sys/param.h>

#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ttyent.h>
#include <unistd.h>
#include <utmp.h>
#ifdef SUPPORT_UTMPX
#include <utmpx.h>
#endif
#include <util.h>

#include "extern.h"

#ifdef SUPPORT_UTMP
typedef struct utmp UTMP;

static int fd = -1;
static int topslot = -1;

/*
 * Special versions of login()/logout() which hold the utmp file open,
 * for use with ftpd.
 */

void
ftpd_login(const struct utmp *ut)
{
        UTMP ubuf;

        /*
         * First, loop through /etc/ttys, if needed, to initialize the
         * top of the tty slots, since ftpd has no tty.
         */
        if (topslot < 0) {
                topslot = 0;
                while (getttyent() != NULL)
                        topslot++;
        }
        if ((topslot < 0) || ((fd < 0)
            && (fd = open(_PATH_UTMP, O_RDWR|O_CREAT, 0644)) < 0))
                return;

        /*
         * Now find a slot that's not in use...
         */
        (void)lseek(fd, (off_t)(topslot * sizeof(UTMP)), SEEK_SET);

        while (1) {
                if (read(fd, &ubuf, sizeof(UTMP)) == sizeof(UTMP)) {
                        if (!ubuf.ut_name[0]) {
                                (void)lseek(fd, -(off_t)sizeof(UTMP), SEEK_CUR);
                                break;
                        }
                        topslot++;
                } else {
                        (void)lseek(fd, (off_t)(topslot * sizeof(UTMP)),
                            SEEK_SET);
                        break;
                }
        }

        (void)write(fd, ut, sizeof(UTMP));
}

int
ftpd_logout(const char *line)
{
        UTMP ut;
        int rval;

        rval = 0;
        if (fd < 0)
                return(rval);

        (void)lseek(fd, 0, SEEK_SET);

        while (read(fd, &ut, sizeof(UTMP)) == sizeof(UTMP)) {
                if (!ut.ut_name[0]
                    || strncmp(ut.ut_line, line, UT_LINESIZE))
                        continue;
                memset(ut.ut_name, 0, UT_NAMESIZE);
                memset(ut.ut_host, 0, UT_HOSTSIZE);
                (void)time(&ut.ut_time);
                (void)lseek(fd, -(off_t)sizeof(UTMP), SEEK_CUR);
                (void)write(fd, &ut, sizeof(UTMP));
                rval = 1;
        }
        return(rval);
}
#endif /* SUPPORT_UTMP */

#ifdef SUPPORT_UTMPX
/*
 * special version of loginx which updates utmpx only.
 */
void
ftpd_loginx(const struct utmpx *ut)
{
        (void)pututxline(ut);
}

int
ftpd_logoutx(const char *line, int status, int mode)
{
        return logoutx(line, status, mode);
}
#endif