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15637ed4 RG |
1 | /* |
2 | * Copyright (c) 1989 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #if defined(LIBC_SCCS) && !defined(lint) | |
35 | static char sccsid[] = "@(#)pwcache.c 5.4 (Berkeley) 6/1/90"; | |
36 | #endif /* LIBC_SCCS and not lint */ | |
37 | ||
38 | #include <sys/types.h> | |
39 | #include <utmp.h> | |
40 | #include <pwd.h> | |
41 | #include <grp.h> | |
42 | #include <stdio.h> | |
43 | ||
44 | #define NCACHE 64 /* power of 2 */ | |
45 | #define MASK NCACHE - 1 /* bits to store with */ | |
46 | ||
47 | static int pwopen = 0; | |
48 | static int gropen = 0; | |
49 | ||
50 | char * | |
51 | user_from_uid(uid, nouser) | |
52 | uid_t uid; | |
53 | int nouser; | |
54 | { | |
55 | static struct ncache { | |
56 | uid_t uid; | |
57 | char name[UT_NAMESIZE + 1]; | |
58 | } c_uid[NCACHE]; | |
59 | static char nbuf[15]; /* 32 bits == 10 digits */ | |
60 | register struct passwd *pw; | |
61 | register struct ncache *cp; | |
62 | ||
63 | cp = c_uid + (uid & MASK); | |
64 | if (cp->uid != uid || !*cp->name) { | |
65 | if (pwopen == 0) { | |
66 | setpassent(1); | |
67 | pwopen++; | |
68 | } | |
69 | if (!(pw = getpwuid(uid))) { | |
70 | if (nouser) | |
71 | return((char *)NULL); | |
72 | (void)sprintf(nbuf, "%u", uid); | |
73 | return(nbuf); | |
74 | } | |
75 | cp->uid = uid; | |
76 | (void)strncpy(cp->name, pw->pw_name, UT_NAMESIZE); | |
77 | cp->name[UT_NAMESIZE] = '\0'; | |
78 | } | |
79 | return(cp->name); | |
80 | } | |
81 | ||
82 | char * | |
83 | group_from_gid(gid, nogroup) | |
84 | gid_t gid; | |
85 | int nogroup; | |
86 | { | |
87 | static struct ncache { | |
88 | gid_t gid; | |
89 | char name[UT_NAMESIZE]; | |
90 | } c_gid[NCACHE]; | |
91 | static char nbuf[15]; /* 32 bits == 10 digits */ | |
92 | register struct group *gr; | |
93 | register struct ncache *cp; | |
94 | ||
95 | cp = c_gid + (gid & MASK); | |
96 | if (cp->gid != gid || !*cp->name) { | |
97 | if (gropen == 0) { | |
98 | setgroupent(1); | |
99 | gropen++; | |
100 | } | |
101 | if (!(gr = getgrgid(gid))) { | |
102 | if (nogroup) | |
103 | return((char *)NULL); | |
104 | (void)sprintf(nbuf, "%u", gid); | |
105 | return(nbuf); | |
106 | } | |
107 | cp->gid = gid; | |
108 | (void)strncpy(cp->name, gr->gr_name, UT_NAMESIZE); | |
109 | cp->name[UT_NAMESIZE] = '\0'; | |
110 | } | |
111 | return(cp->name); | |
112 | } |