Commit | Line | Data |
---|---|---|
59a92d18 AH |
1 | /* $NetBSD: utmp.c,v 1.8 2009/01/11 02:46:27 christos Exp $ */ |
2 | ||
3 | /*- | |
4 | * Copyright (c) 2002 The NetBSD Foundation, Inc. | |
5 | * All rights reserved. | |
6 | * | |
7 | * This code is derived from software contributed to The NetBSD Foundation | |
8 | * by Christos Zoulas. | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or without | |
11 | * modification, are permitted provided that the following conditions | |
12 | * are met: | |
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 | * | |
19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS | |
20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED | |
21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS | |
23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
29 | * POSSIBILITY OF SUCH DAMAGE. | |
30 | */ | |
59a92d18 AH |
31 | |
32 | #include "namespace.h" | |
33 | #include <sys/types.h> | |
34 | #include <sys/param.h> | |
35 | #include <stdio.h> | |
36 | #include <string.h> | |
37 | #include <time.h> | |
38 | #include <utmp.h> | |
39 | #include <sys/stat.h> | |
40 | ||
41 | static struct utmp utmp; | |
42 | static FILE *ut; | |
43 | static char utfile[MAXPATHLEN] = _PATH_UTMP; | |
44 | ||
45 | void | |
46 | setutent(void) | |
47 | { | |
48 | if (ut == NULL) | |
49 | return; | |
50 | (void)fseeko(ut, (off_t)0, SEEK_SET); | |
51 | } | |
52 | ||
53 | struct utmp * | |
54 | getutent(void) | |
55 | { | |
56 | if (ut == NULL) { | |
57 | struct stat st; | |
58 | off_t numentries; | |
59 | if ((ut = fopen(utfile, "r")) == NULL) | |
60 | return NULL; | |
61 | if (fstat(fileno(ut), &st) == -1) | |
62 | goto out; | |
63 | /* | |
64 | * If we have a an old version utmp file bail. | |
65 | */ | |
66 | numentries = st.st_size / sizeof(utmp); | |
67 | if ((off_t)(numentries * sizeof(utmp)) != st.st_size) | |
68 | goto out; | |
69 | } | |
70 | if (fread(&utmp, sizeof(utmp), 1, ut) == 1) | |
71 | return &utmp; | |
72 | out: | |
73 | (void)fclose(ut); | |
74 | return NULL; | |
75 | } | |
76 | ||
77 | void | |
78 | endutent(void) | |
79 | { | |
80 | if (ut != NULL) { | |
81 | (void)fclose(ut); | |
82 | ut = NULL; | |
83 | } | |
84 | } | |
85 | ||
86 | int | |
87 | utmpname(const char *fname) | |
88 | { | |
89 | size_t len = strlen(fname); | |
90 | ||
91 | if (len >= sizeof(utfile)) | |
92 | return 0; | |
93 | ||
94 | /* must not end in x! */ | |
95 | if (fname[len - 1] == 'x') | |
96 | return 0; | |
97 | ||
98 | (void)strlcpy(utfile, fname, sizeof(utfile)); | |
99 | endutent(); | |
100 | return 1; | |
101 | } |