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/*
* This file has been modified from the original OpenBSD version
*/
/* $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
#include <errno.h>
#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>
/*
* find first matching slot in utmp, or "-1" for none
*
* algorithm: for USER_PROCESS, check tty name
* for DEAD_PROCESS, check PID and tty name
*
*/
int find_tty_slot( utp )
struct utmp * utp;
{
int t = 0;
struct utmp * u;
setutent();
while((u = getutent()) != NULL) {
if (utp->ut_type == USER_PROCESS &&
(strncmp(utp->ut_line, u->ut_line, sizeof(utp->ut_line)) == 0)) {
endutent();
return(t);
}
if ((utp->ut_type == DEAD_PROCESS) && (utp->ut_pid == u->ut_pid) &&
(strncmp(utp->ut_line, u->ut_line, sizeof(utp->ut_line)) == 0 )) {
endutent();
return(t);
}
t++;
}
endutent();
return(-1);
}
#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;
/* can't use ttyslot here, as that will not work for logout
* (record_logout() is called from the master sshd, which does
* not have the correct tty on stdin/out, so ttyslot will return
* "-1" or (worse) a wrong number
*/
tty = find_tty_slot(utp);
fd = open(_PATH_UTMP, O_RDWR|O_CREAT, 0644);
if (fd == -1) {
log("Couldn't open %s: %s", _PATH_UTMP, strerror(errno));
} else {
/* If no tty was found... */
if (tty == -1) {
/* ... append it to utmp on login */
if (utp->ut_type == USER_PROCESS) {
if ((fd = open(_PATH_UTMP, O_WRONLY|O_APPEND, 0)) >= 0) {
(void)write(fd, utp, sizeof(struct utmp));
(void)close(fd);
}
} else {
/* Shouldn't get to here unless somthing happened to utmp */
/* Between login and logout */
log("No tty slot found at logout");
}
} else {
/* Otherwise, tty was found - update at its location */
#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 */
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