1/*	$NetBSD: ypalias_init.c,v 1.3 2024/06/02 11:44:29 andvar Exp $	*/
2
3/*
4 * Copyright (c) 2009 The NetBSD Foundation
5 * 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. The name of the author may not be used to endorse or promote
16 *    products derived from this software without specific prior written
17 *    permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
20 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
23 * 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/* Code contributed by Greywolf <greywolf@starwolf.com>
33 * 28 August 2003.  All rights released to The NetBSD Foundation.
34 */
35
36#include <sys/cdefs.h>
37#ifndef lint
38__RCSID("$NetBSD: ypalias_init.c,v 1.3 2024/06/02 11:44:29 andvar Exp $");
39#endif
40
41#include <err.h>
42#include <stdio.h>
43#include <stdlib.h>
44#include <string.h>
45#include <unistd.h>
46#include <paths.h>
47#include <errno.h>
48
49#include "ypalias_init.h"
50
51#ifndef _PATH_YPNICKNAMES
52#define _PATH_YPNICKNAMES   "/var/yp/nicknames"
53#endif
54
55const struct ypalias def_ypaliases[] = {
56	{ "passwd", "passwd.byname" },
57	{ "group", "group.byname" },
58	{ "networks", "networks.byaddr" },
59	{ "hosts", "hosts.byaddr" },
60	{ "protocols", "protocols.bynumber" },
61	{ "services", "services.byname" },
62	{ "aliases", "mail.aliases" },
63	{ "ethers", "ethers.byname" },
64	{ NULL, NULL },
65};
66
67const struct ypalias *
68ypalias_init(void)
69{
70	FILE *fp;
71	char *cp, *line;
72	struct ypalias *ypa;
73	size_t nypalias = 50;
74	size_t i = 0, len, lineno;
75
76	if ((fp = fopen(_PATH_YPNICKNAMES, "r")) == NULL)
77		return &def_ypaliases[0];
78
79	if ((ypa = calloc(sizeof(*ypa), nypalias)) == NULL)
80		goto out;
81
82	lineno = 1;
83	for (; (line = fparseln(fp, &len, &lineno, NULL,
84	    FPARSELN_UNESCALL));) {
85		cp = line;
86		/* Ignore malformed lines */
87		if ((ypa[i].alias = strsep(&line, " \t\n")) == NULL ||
88		    (ypa[i].name = strsep(&line, " \t\n")) == NULL ||
89		    ypa[i].alias != cp) {
90			warnx("%s, %zu: syntax error, ignored",
91			    _PATH_YPNICKNAMES, lineno);
92			free(cp);
93		} else
94			i++;
95		if (i == nypalias) {
96			nypalias <<= 1;
97			if (reallocarr(&ypa, nypalias, sizeof(*ypa)) != 0)
98				goto out;
99		}
100	}
101	ypa[i].alias = ypa[i].name = NULL;
102	i++;
103
104	(void)fclose(fp);
105	if (reallocarr(&ypa, i, sizeof(*ypa)) == 0)
106		return ypa;
107out:
108	warn("Cannot allocate alias space, returning default list");
109	if (ypa) {
110		do
111			free(__UNCONST(ypa[--i].alias));
112		while (i != 0);
113		free(ypa);
114	}
115	(void)fclose(fp);
116	return def_ypaliases;
117}
118