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15637ed4 RG |
1 | /* |
2 | * Copyright (c) 1983 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[] = "@(#)initgroups.c 5.7 (Berkeley) 2/23/91"; | |
36 | #endif /* LIBC_SCCS and not lint */ | |
37 | ||
38 | /* | |
39 | * initgroups | |
40 | */ | |
41 | #include <sys/param.h> | |
42 | #include <stdio.h> | |
43 | #include <string.h> | |
44 | #include <unistd.h> | |
45 | #include <grp.h> | |
46 | ||
47 | struct group *getgrent(); | |
48 | ||
49 | int | |
50 | initgroups(uname, agroup) | |
51 | const char *uname; | |
52 | int agroup; | |
53 | { | |
54 | int groups[NGROUPS], ngroups = 0; | |
55 | register struct group *grp; | |
56 | register int i; | |
57 | ||
58 | /* | |
59 | * If installing primary group, duplicate it; | |
60 | * the first element of groups is the effective gid | |
61 | * and will be overwritten when a setgid file is executed. | |
62 | */ | |
63 | if (agroup >= 0) { | |
64 | groups[ngroups++] = agroup; | |
65 | groups[ngroups++] = agroup; | |
66 | } | |
67 | setgrent(); | |
68 | while (grp = getgrent()) { | |
69 | if (grp->gr_gid == agroup) | |
70 | continue; | |
71 | for (i = 0; grp->gr_mem[i]; i++) | |
72 | if (!strcmp(grp->gr_mem[i], uname)) { | |
73 | if (ngroups == NGROUPS) { | |
74 | fprintf(stderr, "initgroups: %s is in too many groups\n", uname); | |
75 | goto toomany; | |
76 | } | |
77 | groups[ngroups++] = grp->gr_gid; | |
78 | } | |
79 | } | |
80 | toomany: | |
81 | endgrent(); | |
82 | if (setgroups(ngroups, groups) < 0) { | |
83 | perror("setgroups"); | |
84 | return (-1); | |
85 | } | |
86 | return (0); | |
87 | } |