1 /* $OpenBSD: logwtmp.c,v 1.11 2019/06/28 13:32:43 deraadt 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. Neither the name of the University nor the names of its contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #include <sys/types.h>
32 #include <sys/time.h>
33 #include <sys/stat.h>
34
35 #include <fcntl.h>
36 #include <string.h>
37 #include <unistd.h>
38 #include <utmp.h>
39
40 #include "util.h"
41
42 void
logwtmp(const char * line,const char * name,const char * host)43 logwtmp(const char *line, const char *name, const char *host)
44 {
45 struct stat buf;
46 struct utmp ut;
47 int fd;
48
49 if ((fd = open(_PATH_WTMP, O_WRONLY|O_APPEND|O_CLOEXEC)) == -1)
50 return;
51 if (fstat(fd, &buf) == 0) {
52 (void) strncpy(ut.ut_line, line, sizeof(ut.ut_line));
53 (void) strncpy(ut.ut_name, name, sizeof(ut.ut_name));
54 (void) strncpy(ut.ut_host, host, sizeof(ut.ut_host));
55 (void) time(&ut.ut_time);
56 if (write(fd, &ut, sizeof(struct utmp)) !=
57 sizeof(struct utmp))
58 (void) ftruncate(fd, buf.st_size);
59 }
60 (void) close(fd);
61 }
62