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- /* $OpenBSD: login.c,v 1.7 2002/06/09 22:18:43 fgsch Exp $ */
- /*
- * 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. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. 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.
- */
-
- #if defined(LIBC_SCCS) && !defined(lint)
- /* from: static char sccsid[] = "@(#)login.c 8.1 (Berkeley) 6/4/93"; */
- static const char rcsid[] = "$Id: login.c,v 1.7 2002/06/09 22:18:43 fgsch Exp $";
- #endif /* LIBC_SCCS and not lint */
-
- #include <sys/types.h>
-
- #include <fcntl.h>
- #include <unistd.h>
- #include <stdlib.h>
- #include <utmp.h>
- #include <stdio.h>
- #include <string.h>
-
- #include "util.h"
-
- void
- login(utp)
- struct utmp *utp;
- {
- struct utmp old_ut;
- register int fd;
- int tty;
-
- tty = ttyslot();
- if (tty > 0 && (fd = open(_PATH_UTMP, O_RDWR|O_CREAT, 0644)) >= 0) {
- (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET);
- /*
- * Prevent luser from zero'ing out ut_host.
- * If the new ut_line is empty but the old one is not
- * and ut_line and ut_name match, preserve the old ut_line.
- */
- if (read(fd, &old_ut, sizeof(struct utmp)) ==
- sizeof(struct utmp) && utp->ut_host[0] == '\0' &&
- old_ut.ut_host[0] != '\0' &&
- strncmp(old_ut.ut_line, utp->ut_line, UT_LINESIZE) == 0 &&
- strncmp(old_ut.ut_name, utp->ut_name, UT_NAMESIZE) == 0)
- (void)memcpy(utp->ut_host, old_ut.ut_host, UT_HOSTSIZE);
- (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET);
- (void)write(fd, utp, sizeof(struct utmp));
- (void)close(fd);
- }
- if ((fd = open(_PATH_WTMP, O_WRONLY|O_APPEND, 0)) >= 0) {
- (void)write(fd, utp, sizeof(struct utmp));
- (void)close(fd);
- }
- }
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