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 /*
33 * This is a slightly modified chunk of getgrent(3). All the YP support
34 * and unneeded functions have been stripped out.
35 */
36
37 #include <sys/types.h>
38 #include <grp.h>
39 #include <stdio.h>
40 #include <stdlib.h>
41 #include <string.h>
42
43 FILE *_gr_fp;
44 static struct group _gr_group;
45 static int _gr_stayopen;
46 static int grscan(int, int);
47 static int start_gr(void);
48
49 #define MAXGRP 200
50 static char *members[MAXGRP];
51 #define MAXLINELENGTH 1024
52 static char line[MAXLINELENGTH];
53
54 struct group *
_getgrent(void)55 _getgrent(void)
56 {
57 if (!_gr_fp && !start_gr()) {
58 return NULL;
59 }
60
61
62 if (!grscan(0, 0))
63 return(NULL);
64 return(&_gr_group);
65 }
66
67 static int
start_gr(void)68 start_gr(void)
69 {
70 return 1;
71 }
72
73 int
_setgroupent(int stayopen)74 _setgroupent(int stayopen)
75 {
76 if (!start_gr())
77 return(0);
78 _gr_stayopen = stayopen;
79 return(1);
80 }
81
82 int
_setgrent(void)83 _setgrent(void)
84 {
85 return(_setgroupent(0));
86 }
87
88 void
_endgrent(void)89 _endgrent(void)
90 {
91 if (_gr_fp) {
92 (void)fclose(_gr_fp);
93 _gr_fp = NULL;
94 }
95 }
96
97 static int
grscan(int search,int gid)98 grscan(int search, int gid)
99 {
100 char *cp, **m;
101 char *bp;
102 for (;;) {
103 if (!fgets(line, sizeof(line), _gr_fp))
104 return(0);
105 bp = line;
106 /* skip lines that are too big */
107 if (!strchr(line, '\n')) {
108 int ch;
109
110 while ((ch = getc(_gr_fp)) != '\n' && ch != EOF)
111 ;
112 continue;
113 }
114 if ((_gr_group.gr_name = strsep(&bp, ":\n")) == NULL)
115 break;
116 if (_gr_group.gr_name[0] == '+')
117 continue;
118 if ((_gr_group.gr_passwd = strsep(&bp, ":\n")) == NULL)
119 break;
120 if (!(cp = strsep(&bp, ":\n")))
121 continue;
122 _gr_group.gr_gid = atoi(cp);
123 if (search && _gr_group.gr_gid != gid)
124 continue;
125 cp = NULL;
126 if (bp == NULL) /* !! Must check for this! */
127 break;
128 for (m = _gr_group.gr_mem = members;; bp++) {
129 if (m == &members[MAXGRP - 1])
130 break;
131 if (*bp == ',') {
132 if (cp) {
133 *bp = '\0';
134 *m++ = cp;
135 cp = NULL;
136 }
137 } else if (*bp == '\0' || *bp == '\n' || *bp == ' ') {
138 if (cp) {
139 *bp = '\0';
140 *m++ = cp;
141 }
142 break;
143 } else if (cp == NULL)
144 cp = bp;
145 }
146 *m = NULL;
147 return(1);
148 }
149 /* NOTREACHED */
150 return (0);
151 }
152