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 static const char rcsid[] =
37 "$FreeBSD$";
38 #endif /* not lint */
39
40 /*
41 * This is a slightly modified chunk of getgrent(3). All the YP support
42 * and unneeded functions have been stripped out.
43 */
44
45 #include <sys/types.h>
46 #include <grp.h>
47 #include <stdio.h>
48 #include <stdlib.h>
49 #include <string.h>
50
51 FILE *_gr_fp;
52 static struct group _gr_group;
53 static int _gr_stayopen;
54 static int grscan(int, int);
55 static int start_gr(void);
56
57 #define MAXGRP 200
58 static char *members[MAXGRP];
59 #define MAXLINELENGTH 1024
60 static char line[MAXLINELENGTH];
61
62 struct group *
_getgrent(void)63 _getgrent(void)
64 {
65 if (!_gr_fp && !start_gr()) {
66 return NULL;
67 }
68
69
70 if (!grscan(0, 0))
71 return(NULL);
72 return(&_gr_group);
73 }
74
75 static int
start_gr(void)76 start_gr(void)
77 {
78 return 1;
79 }
80
81 int
_setgroupent(int stayopen)82 _setgroupent(int stayopen)
83 {
84 if (!start_gr())
85 return(0);
86 _gr_stayopen = stayopen;
87 return(1);
88 }
89
90 int
_setgrent(void)91 _setgrent(void)
92 {
93 return(_setgroupent(0));
94 }
95
96 void
_endgrent(void)97 _endgrent(void)
98 {
99 if (_gr_fp) {
100 (void)fclose(_gr_fp);
101 _gr_fp = NULL;
102 }
103 }
104
105 static int
grscan(int search,int gid)106 grscan(int search, int gid)
107 {
108 char *cp, **m;
109 char *bp;
110 for (;;) {
111 if (!fgets(line, sizeof(line), _gr_fp))
112 return(0);
113 bp = line;
114 /* skip lines that are too big */
115 if (!strchr(line, '\n')) {
116 int ch;
117
118 while ((ch = getc(_gr_fp)) != '\n' && ch != EOF)
119 ;
120 continue;
121 }
122 if ((_gr_group.gr_name = strsep(&bp, ":\n")) == NULL)
123 break;
124 if (_gr_group.gr_name[0] == '+')
125 continue;
126 if ((_gr_group.gr_passwd = strsep(&bp, ":\n")) == NULL)
127 break;
128 if (!(cp = strsep(&bp, ":\n")))
129 continue;
130 _gr_group.gr_gid = atoi(cp);
131 if (search && _gr_group.gr_gid != gid)
132 continue;
133 cp = NULL;
134 if (bp == NULL) /* !! Must check for this! */
135 break;
136 for (m = _gr_group.gr_mem = members;; bp++) {
137 if (m == &members[MAXGRP - 1])
138 break;
139 if (*bp == ',') {
140 if (cp) {
141 *bp = '\0';
142 *m++ = cp;
143 cp = NULL;
144 }
145 } else if (*bp == '\0' || *bp == '\n' || *bp == ' ') {
146 if (cp) {
147 *bp = '\0';
148 *m++ = cp;
149 }
150 break;
151 } else if (cp == NULL)
152 cp = bp;
153 }
154 *m = NULL;
155 return(1);
156 }
157 /* NOTREACHED */
158 return (0);
159 }
160