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
43FILE *_gr_fp;
44static struct group _gr_group;
45static int _gr_stayopen;
46static int grscan(int, int);
47static int start_gr(void);
48
49#define	MAXGRP		200
50static char *members[MAXGRP];
51#define	MAXLINELENGTH	1024
52static char line[MAXLINELENGTH];
53
54struct group *
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
67static int
68start_gr(void)
69{
70	return 1;
71}
72
73int
74_setgroupent(int stayopen)
75{
76	if (!start_gr())
77		return(0);
78	_gr_stayopen = stayopen;
79	return(1);
80}
81
82int
83_setgrent(void)
84{
85	return(_setgroupent(0));
86}
87
88void
89_endgrent(void)
90{
91	if (_gr_fp) {
92		(void)fclose(_gr_fp);
93		_gr_fp = NULL;
94	}
95}
96
97static int
98grscan(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