Damien Miller | 04f8014 | 1999-11-19 15:32:34 +1100 | [diff] [blame] | 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"; */ |
Damien Miller | b3ca3aa | 1999-11-22 13:57:07 +1100 | [diff] [blame] | 40 | static char *rcsid = "$OpenBSD: login.c,v 1.5 1998/07/13 02:11:12 millert Exp $"; |
Damien Miller | 04f8014 | 1999-11-19 15:32:34 +1100 | [diff] [blame] | 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> |
Damien Miller | bf1c9b2 | 1999-12-09 10:16:54 +1100 | [diff] [blame] | 48 | #ifdef HAVE_UTMPX_H |
| 49 | # include <utmpx.h> |
| 50 | #endif |
| 51 | #ifdef HAVE_UTMP_H |
| 52 | # include <utmp.h> |
| 53 | #endif |
Damien Miller | 04f8014 | 1999-11-19 15:32:34 +1100 | [diff] [blame] | 54 | #include <stdio.h> |
Damien Miller | c6b3bbe | 1999-12-13 08:27:33 +1100 | [diff] [blame] | 55 | #include <string.h> |
Damien Miller | 04f8014 | 1999-11-19 15:32:34 +1100 | [diff] [blame] | 56 | |
| 57 | void |
| 58 | login(utp) |
Damien Miller | bf1c9b2 | 1999-12-09 10:16:54 +1100 | [diff] [blame] | 59 | struct UTMP_STR *utp; |
Damien Miller | 04f8014 | 1999-11-19 15:32:34 +1100 | [diff] [blame] | 60 | { |
Damien Miller | bf1c9b2 | 1999-12-09 10:16:54 +1100 | [diff] [blame] | 61 | struct UTMP_STR old_ut; |
Damien Miller | 04f8014 | 1999-11-19 15:32:34 +1100 | [diff] [blame] | 62 | register int fd; |
| 63 | int tty; |
| 64 | |
Damien Miller | 063fdf8 | 1999-11-25 13:08:31 +1100 | [diff] [blame] | 65 | #ifndef UT_LINESIZE |
| 66 | # define UT_LINESIZE (sizeof(old_ut.ut_line)) |
Damien Miller | bf1c9b2 | 1999-12-09 10:16:54 +1100 | [diff] [blame] | 67 | # ifdef HAVE_UTMPX_H |
| 68 | # define UT_NAMESIZE (sizeof(old_ut.ut_user)) |
| 69 | # else |
| 70 | # define UT_NAMESIZE (sizeof(old_ut.ut_name)) |
| 71 | # endif |
Damien Miller | 063fdf8 | 1999-11-25 13:08:31 +1100 | [diff] [blame] | 72 | # ifdef HAVE_HOST_IN_UTMP |
| 73 | # define UT_HOSTSIZE (sizeof(old_ut.ut_host)) |
| 74 | # endif |
Damien Miller | bf1c9b2 | 1999-12-09 10:16:54 +1100 | [diff] [blame] | 75 | # ifdef HAVE_HOST_IN_UTMPX |
| 76 | # define UT_HOSTSIZE (sizeof(old_ut.ut_host)) |
| 77 | # endif |
Damien Miller | 063fdf8 | 1999-11-25 13:08:31 +1100 | [diff] [blame] | 78 | #endif |
| 79 | |
Damien Miller | 04f8014 | 1999-11-19 15:32:34 +1100 | [diff] [blame] | 80 | tty = ttyslot(); |
| 81 | if (tty > 0 && (fd = open(_PATH_UTMP, O_RDWR|O_CREAT, 0644)) >= 0) { |
Damien Miller | c6b3bbe | 1999-12-13 08:27:33 +1100 | [diff] [blame] | 82 | #if defined(HAVE_HOST_IN_UTMP) || defined(HAVE_HOST_IN_UTMPX) |
Damien Miller | bf1c9b2 | 1999-12-09 10:16:54 +1100 | [diff] [blame] | 83 | (void)lseek(fd, (off_t)(tty * sizeof(struct UTMP_STR)), SEEK_SET); |
Damien Miller | 04f8014 | 1999-11-19 15:32:34 +1100 | [diff] [blame] | 84 | /* |
| 85 | * Prevent luser from zero'ing out ut_host. |
| 86 | * If the new ut_line is empty but the old one is not |
| 87 | * and ut_line and ut_name match, preserve the old ut_line. |
| 88 | */ |
Damien Miller | bf1c9b2 | 1999-12-09 10:16:54 +1100 | [diff] [blame] | 89 | if (read(fd, &old_ut, sizeof(struct UTMP_STR)) == |
| 90 | sizeof(struct UTMP_STR) && utp->ut_host[0] == '\0' && |
Damien Miller | 04f8014 | 1999-11-19 15:32:34 +1100 | [diff] [blame] | 91 | old_ut.ut_host[0] != '\0' && |
| 92 | strncmp(old_ut.ut_line, utp->ut_line, UT_LINESIZE) == 0 && |
| 93 | strncmp(old_ut.ut_name, utp->ut_name, UT_NAMESIZE) == 0) |
| 94 | (void)memcpy(utp->ut_host, old_ut.ut_host, UT_HOSTSIZE); |
Damien Miller | c6b3bbe | 1999-12-13 08:27:33 +1100 | [diff] [blame] | 95 | #endif /* defined(HAVE_HOST_IN_UTMP) || defined(HAVE_HOST_IN_UTMPX) */ |
Damien Miller | bf1c9b2 | 1999-12-09 10:16:54 +1100 | [diff] [blame] | 96 | (void)lseek(fd, (off_t)(tty * sizeof(struct UTMP_STR)), SEEK_SET); |
| 97 | (void)write(fd, utp, sizeof(struct UTMP_STR)); |
Damien Miller | 04f8014 | 1999-11-19 15:32:34 +1100 | [diff] [blame] | 98 | (void)close(fd); |
| 99 | } |
| 100 | if ((fd = open(_PATH_WTMP, O_WRONLY|O_APPEND, 0)) >= 0) { |
Damien Miller | bf1c9b2 | 1999-12-09 10:16:54 +1100 | [diff] [blame] | 101 | (void)write(fd, utp, sizeof(struct UTMP_STR)); |
Damien Miller | 04f8014 | 1999-11-19 15:32:34 +1100 | [diff] [blame] | 102 | (void)close(fd); |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | #endif /* HAVE_LOGIN */ |