1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #ifndef lint
33 #if 0
34 static const char sccsid[] = "@(#)getgrent.c 8.2 (Berkeley) 3/21/94";
35 #endif
36 #endif /* not lint */
37
38 /*
39 * This is a slightly modified chunk of getgrent(3). All the YP support
40 * and unneeded functions have been stripped out.
41 */
42
43 #include <sys/types.h>
44 #include <grp.h>
45 #include <stdio.h>
46 #include <stdlib.h>
47 #include <string.h>
48
49 FILE *_gr_fp;
50 static struct group _gr_group;
51 static int _gr_stayopen;
52 static int grscan(int, int);
53 static int start_gr(void);
54
55 #define MAXGRP 200
56 static char *members[MAXGRP];
57 #define MAXLINELENGTH 1024
58 static char line[MAXLINELENGTH];
59
60 struct group *
_getgrent(void)61 _getgrent(void)
62 {
63 if (!_gr_fp && !start_gr()) {
64 return NULL;
65 }
66
67
68 if (!grscan(0, 0))
69 return(NULL);
70 return(&_gr_group);
71 }
72
73 static int
start_gr(void)74 start_gr(void)
75 {
76 return 1;
77 }
78
79 int
_setgroupent(int stayopen)80 _setgroupent(int stayopen)
81 {
82 if (!start_gr())
83 return(0);
84 _gr_stayopen = stayopen;
85 return(1);
86 }
87
88 int
_setgrent(void)89 _setgrent(void)
90 {
91 return(_setgroupent(0));
92 }
93
94 void
_endgrent(void)95 _endgrent(void)
96 {
97 if (_gr_fp) {
98 (void)fclose(_gr_fp);
99 _gr_fp = NULL;
100 }
101 }
102
103 static int
grscan(int search,int gid)104 grscan(int search, int gid)
105 {
106 char *cp, **m;
107 char *bp;
108 for (;;) {
109 if (!fgets(line, sizeof(line), _gr_fp))
110 return(0);
111 bp = line;
112 /* skip lines that are too big */
113 if (!strchr(line, '\n')) {
114 int ch;
115
116 while ((ch = getc(_gr_fp)) != '\n' && ch != EOF)
117 ;
118 continue;
119 }
120 if ((_gr_group.gr_name = strsep(&bp, ":\n")) == NULL)
121 break;
122 if (_gr_group.gr_name[0] == '+')
123 continue;
124 if ((_gr_group.gr_passwd = strsep(&bp, ":\n")) == NULL)
125 break;
126 if (!(cp = strsep(&bp, ":\n")))
127 continue;
128 _gr_group.gr_gid = atoi(cp);
129 if (search && _gr_group.gr_gid != gid)
130 continue;
131 cp = NULL;
132 if (bp == NULL) /* !! Must check for this! */
133 break;
134 for (m = _gr_group.gr_mem = members;; bp++) {
135 if (m == &members[MAXGRP - 1])
136 break;
137 if (*bp == ',') {
138 if (cp) {
139 *bp = '\0';
140 *m++ = cp;
141 cp = NULL;
142 }
143 } else if (*bp == '\0' || *bp == '\n' || *bp == ' ') {
144 if (cp) {
145 *bp = '\0';
146 *m++ = cp;
147 }
148 break;
149 } else if (cp == NULL)
150 cp = bp;
151 }
152 *m = NULL;
153 return(1);
154 }
155 /* NOTREACHED */
156 return (0);
157 }
158