1 /* $OpenBSD: pwcache.c,v 1.9 2005/08/08 08:05:34 espie Exp $ */
2 /*
3 * Copyright (c) 1989, 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 /* OPENBSD ORIGINAL: lib/libc/gen/pwcache.c */
32
33 #include "includes.h"
34
35 #include <sys/types.h>
36
37 #include <grp.h>
38 #include <pwd.h>
39 #include <stdio.h>
40 #include <stdlib.h>
41 #include <string.h>
42
43 #define NCACHE 64 /* power of 2 */
44 #define MASK (NCACHE - 1) /* bits to store with */
45
46 #ifndef HAVE_USER_FROM_UID
47 char *
user_from_uid(uid_t uid,int nouser)48 user_from_uid(uid_t uid, int nouser)
49 {
50 static struct ncache {
51 uid_t uid;
52 char *name;
53 } c_uid[NCACHE];
54 static int pwopen;
55 static char nbuf[15]; /* 32 bits == 10 digits */
56 struct passwd *pw;
57 struct ncache *cp;
58
59 cp = c_uid + (uid & MASK);
60 if (cp->uid != uid || cp->name == NULL) {
61 if (pwopen == 0) {
62 #ifdef HAVE_SETPASSENT
63 setpassent(1);
64 #endif
65 pwopen = 1;
66 }
67 if ((pw = getpwuid(uid)) == NULL) {
68 if (nouser)
69 return (NULL);
70 (void)snprintf(nbuf, sizeof(nbuf), "%lu", (u_long)uid);
71 }
72 cp->uid = uid;
73 if (cp->name != NULL)
74 free(cp->name);
75 cp->name = strdup(pw ? pw->pw_name : nbuf);
76 }
77 return (cp->name);
78 }
79 #endif
80
81 #ifndef HAVE_GROUP_FROM_GID
82 char *
group_from_gid(gid_t gid,int nogroup)83 group_from_gid(gid_t gid, int nogroup)
84 {
85 static struct ncache {
86 gid_t gid;
87 char *name;
88 } c_gid[NCACHE];
89 static int gropen;
90 static char nbuf[15]; /* 32 bits == 10 digits */
91 struct group *gr;
92 struct ncache *cp;
93
94 cp = c_gid + (gid & MASK);
95 if (cp->gid != gid || cp->name == NULL) {
96 if (gropen == 0) {
97 #ifdef HAVE_SETGROUPENT
98 setgroupent(1);
99 #endif
100 gropen = 1;
101 }
102 if ((gr = getgrgid(gid)) == NULL) {
103 if (nogroup)
104 return (NULL);
105 (void)snprintf(nbuf, sizeof(nbuf), "%lu", (u_long)gid);
106 }
107 cp->gid = gid;
108 if (cp->name != NULL)
109 free(cp->name);
110 cp->name = strdup(gr ? gr->gr_name : nbuf);
111 }
112 return (cp->name);
113 }
114 #endif
115