2 * This file has been modified from the original OpenBSD version
5 /* $OpenBSD: login.c,v 1.5 1998/07/13 02:11:12 millert Exp $ */
7 * Copyright (c) 1988, 1993
8 * The Regents of the University of California. All rights reserved.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
44 #if defined(LIBC_SCCS) && !defined(lint)
45 /* from: static char sccsid[] = "@(#)login.c 8.1 (Berkeley) 6/4/93"; */
46 static char *rcsid = "$OpenBSD: login.c,v 1.5 1998/07/13 02:11:12 millert Exp $";
47 #endif /* LIBC_SCCS and not lint */
49 #include <sys/types.h>
54 #if defined(HAVE_UTMPX_H) && defined(USE_UTMPX)
64 * find first matching slot in utmp, or "-1" for none
66 * algorithm: for USER_PROCESS, check tty name
67 * for DEAD_PROCESS, check PID and tty name
70 int find_tty_slot( utp )
78 while((u = getutent()) != NULL) {
79 if (utp->ut_type == USER_PROCESS &&
80 (strncmp(utp->ut_line, u->ut_line, sizeof(utp->ut_line)) == 0)) {
85 if ((utp->ut_type == DEAD_PROCESS) && (utp->ut_pid == u->ut_pid) &&
86 (strncmp(utp->ut_line, u->ut_line, sizeof(utp->ut_line)) == 0 )) {
97 #if defined(HAVE_UTMPX_H) && defined(USE_UTMPX)
102 #else /* defined(HAVE_UTMPX_H) && defined(USE_UTMPX) */
106 #endif /* defined(HAVE_UTMPX_H) && defined(USE_UTMPX) */
108 #if defined(HAVE_HOST_IN_UTMP)
111 #if defined(HAVE_UTMPX_H) && defined(USE_UTMPX)
112 struct utmpx *old_utx;
113 #endif /* defined(HAVE_UTMPX_H) && defined(USE_UTMPX) */
117 /* can't use ttyslot here, as that will not work for logout
118 * (record_logout() is called from the master sshd, which does
119 * not have the correct tty on stdin/out, so ttyslot will return
120 * "-1" or (worse) a wrong number
122 tty = find_tty_slot(utp);
124 fd = open(_PATH_UTMP, O_RDWR|O_CREAT, 0644);
126 log("Couldn't open %s: %s", _PATH_UTMP, strerror(errno));
128 /* If no tty was found... */
130 /* ... append it to utmp on login */
131 if (utp->ut_type == USER_PROCESS) {
132 if ((fd = open(_PATH_UTMP, O_WRONLY|O_APPEND, 0)) >= 0) {
133 (void)write(fd, utp, sizeof(struct utmp));
137 /* Shouldn't get to here unless somthing happened to utmp */
138 /* Between login and logout */
139 log("No tty slot found at logout");
142 /* Otherwise, tty was found - update at its location */
143 #if defined(HAVE_HOST_IN_UTMP)
145 # define UT_LINESIZE (sizeof(old_ut.ut_line))
146 # define UT_NAMESIZE (sizeof(old_ut.ut_name))
147 # define UT_HOSTSIZE (sizeof(old_ut.ut_host))
149 (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET);
151 * Prevent luser from zero'ing out ut_host.
152 * If the new ut_line is empty but the old one is not
153 * and ut_line and ut_name match, preserve the old ut_line.
155 if (read(fd, &old_ut, sizeof(struct utmp)) ==
156 sizeof(struct utmp) && utp->ut_host[0] == '\0' &&
157 old_ut.ut_host[0] != '\0' &&
158 strncmp(old_ut.ut_line, utp->ut_line, UT_LINESIZE) == 0 &&
159 strncmp(old_ut.ut_name, utp->ut_name, UT_NAMESIZE) == 0)
160 (void)memcpy(utp->ut_host, old_ut.ut_host, UT_HOSTSIZE);
161 #endif /* defined(HAVE_HOST_IN_UTMP) */
162 (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET);
163 (void)write(fd, utp, sizeof(struct utmp));
168 if ((fd = open(_PATH_WTMP, O_WRONLY|O_APPEND, 0)) >= 0) {
169 (void)write(fd, utp, sizeof(struct utmp));
172 #if defined(HAVE_UTMPX_H) && defined(USE_UTMPX)
173 old_utx = pututxline(utx);
174 # ifdef HAVE_UPDWTMPX
175 updwtmpx(_PATH_WTMPX, utx);
176 # endif /* HAVE_UPDWTMPX */
178 #endif /* defined(HAVE_UTMPX_H) && defined(USE_UTMPX) */
181 #endif /* HAVE_LOGIN */