[openssh.git] / bsd-login.c

/*	$OpenBSD: login.c,v 1.5 1998/07/13 02:11:12 millert 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.
 */

#include "config.h"
#ifndef HAVE_LOGIN

#if defined(LIBC_SCCS) && !defined(lint)
/* from: static char sccsid[] = "@(#)login.c	8.1 (Berkeley) 6/4/93"; */
static char *rcsid = "$OpenBSD: login.c,v 1.5 1998/07/13 02:11:12 millert Exp $";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>

#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#if defined(HAVE_UTMPX_H) && defined(USE_UTMPX)
# include <utmpx.h>
#endif
#ifdef HAVE_UTMP_H
# include <utmp.h>
#endif
#include <stdio.h>
#include <string.h>

#if defined(HAVE_UTMPX_H) && defined(USE_UTMPX)
void
login(utp,utx)
	struct utmp *utp;
	struct utmpx *utx;
#else /* defined(HAVE_UTMPX_H) && defined(USE_UTMPX) */
void
login(utp)
	struct utmp *utp;
#endif /* defined(HAVE_UTMPX_H) && defined(USE_UTMPX) */
{
#if defined(HAVE_HOST_IN_UTMP)
	struct utmp old_ut;
#endif
#if defined(HAVE_UTMPX_H) && defined(USE_UTMPX)
	struct utmpx *old_utx;
#endif /* defined(HAVE_UTMPX_H) && defined(USE_UTMPX) */
	register int fd;
	int tty;

	tty = ttyslot();
	if (tty > 0 && (fd = open(_PATH_UTMP, O_RDWR|O_CREAT, 0644)) >= 0) {

#if defined(HAVE_HOST_IN_UTMP)
# ifndef UT_LINESIZE
#  define UT_LINESIZE (sizeof(old_ut.ut_line))
#  define UT_NAMESIZE (sizeof(old_ut.ut_name))
#  define UT_HOSTSIZE (sizeof(old_ut.ut_host))
# endif
		(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);
#endif /* defined(HAVE_HOST_IN_UTMP) */
		(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);
	}
#if defined(HAVE_UTMPX_H) && defined(USE_UTMPX)
	old_utx = pututxline(utx);
# ifdef HAVE_UPDWTMPX
	updwtmpx(_PATH_WTMPX, utx);
# endif /* HAVE_UPDWTMPX */
	endutxent();
#endif /* defined(HAVE_UTMPX_H) && defined(USE_UTMPX) */
}

#endif /* HAVE_LOGIN */
Commit	Line	Data
beb43d31	1	/* $OpenBSD: login.c,v 1.5 1998/07/13 02:11:12 millert Exp $ */
	2	/*
	3	* Copyright (c) 1988, 1993
	4	* The Regents of the University of California. All rights reserved.
	5	*
	6	* Redistribution and use in source and binary forms, with or without
	7	* modification, are permitted provided that the following conditions
	8	* are met:
	9	* 1. Redistributions of source code must retain the above copyright
	10	* notice, this list of conditions and the following disclaimer.
	11	* 2. Redistributions in binary form must reproduce the above copyright
	12	* notice, this list of conditions and the following disclaimer in the
	13	* documentation and/or other materials provided with the distribution.
	14	* 3. All advertising materials mentioning features or use of this software
	15	* must display the following acknowledgement:
	16	* This product includes software developed by the University of
	17	* California, Berkeley and its contributors.
	18	* 4. Neither the name of the University nor the names of its contributors
	19	* may be used to endorse or promote products derived from this software
	20	* without specific prior written permission.
	21	*
	22	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	23	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	24	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	25	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	26	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	27	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	28	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	29	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	30	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	31	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	32	* SUCH DAMAGE.
	33	*/
	34
	35	#include "config.h"
	36	#ifndef HAVE_LOGIN
	37
	38	#if defined(LIBC_SCCS) && !defined(lint)
	39	/* from: static char sccsid[] = "@(#)login.c 8.1 (Berkeley) 6/4/93"; */
b09a984b	40	static char *rcsid = "$OpenBSD: login.c,v 1.5 1998/07/13 02:11:12 millert Exp $";
beb43d31	41	#endif /* LIBC_SCCS and not lint */
	42
	43	#include <sys/types.h>
	44
	45	#include <fcntl.h>
	46	#include <unistd.h>
	47	#include <stdlib.h>
92f90c57	48	#if defined(HAVE_UTMPX_H) && defined(USE_UTMPX)
8946db53	49	# include <utmpx.h>
	50	#endif
	51	#ifdef HAVE_UTMP_H
	52	# include <utmp.h>
	53	#endif
beb43d31	54	#include <stdio.h>
847e8865	55	#include <string.h>
beb43d31	56
f498ed15	57	#if defined(HAVE_UTMPX_H) && defined(USE_UTMPX)
	58	void
	59	login(utp,utx)
	60	struct utmp *utp;
	61	struct utmpx *utx;
	62	#else /* defined(HAVE_UTMPX_H) && defined(USE_UTMPX) */
beb43d31	63	void
beb43d31	64	login(utp)
f498ed15	65	struct utmp *utp;
f498ed15	66	#endif /* defined(HAVE_UTMPX_H) && defined(USE_UTMPX) */
beb43d31	67	{
f74efc8d	68	#if defined(HAVE_HOST_IN_UTMP)
f498ed15	69	struct utmp old_ut;
f74efc8d	70	#endif
f498ed15	71	#if defined(HAVE_UTMPX_H) && defined(USE_UTMPX)
	72	struct utmpx *old_utx;
	73	#endif /* defined(HAVE_UTMPX_H) && defined(USE_UTMPX) */
beb43d31	74	register int fd;
	75	int tty;
	76
	77	tty = ttyslot();
	78	if (tty > 0 && (fd = open(_PATH_UTMP, O_RDWR\|O_CREAT, 0644)) >= 0) {
f74efc8d	79
f498ed15	80	#if defined(HAVE_HOST_IN_UTMP)
f74efc8d	81	# ifndef UT_LINESIZE
	82	# define UT_LINESIZE (sizeof(old_ut.ut_line))
	83	# define UT_NAMESIZE (sizeof(old_ut.ut_name))
	84	# define UT_HOSTSIZE (sizeof(old_ut.ut_host))
	85	# endif
f498ed15	86	(void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET);
beb43d31	87	/*
	88	* Prevent luser from zero'ing out ut_host.
	89	* If the new ut_line is empty but the old one is not
	90	* and ut_line and ut_name match, preserve the old ut_line.
	91	*/
f498ed15	92	if (read(fd, &old_ut, sizeof(struct utmp)) ==
f498ed15	93	sizeof(struct utmp) && utp->ut_host[0] == '\0' &&
beb43d31	94	old_ut.ut_host[0] != '\0' &&
	95	strncmp(old_ut.ut_line, utp->ut_line, UT_LINESIZE) == 0 &&
	96	strncmp(old_ut.ut_name, utp->ut_name, UT_NAMESIZE) == 0)
	97	(void)memcpy(utp->ut_host, old_ut.ut_host, UT_HOSTSIZE);
f498ed15	98	#endif /* defined(HAVE_HOST_IN_UTMP) */
	99	(void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET);
	100	(void)write(fd, utp, sizeof(struct utmp));
beb43d31	101	(void)close(fd);
	102	}
	103	if ((fd = open(_PATH_WTMP, O_WRONLY\|O_APPEND, 0)) >= 0) {
f498ed15	104	(void)write(fd, utp, sizeof(struct utmp));
beb43d31	105	(void)close(fd);
beb43d31	106	}
f498ed15	107	#if defined(HAVE_UTMPX_H) && defined(USE_UTMPX)
	108	old_utx = pututxline(utx);
	109	# ifdef HAVE_UPDWTMPX
	110	updwtmpx(_PATH_WTMPX, utx);
	111	# endif /* HAVE_UPDWTMPX */
	112	endutxent();
	113	#endif /* defined(HAVE_UTMPX_H) && defined(USE_UTMPX) */
beb43d31	114	}
	115
	116	#endif /* HAVE_LOGIN */