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
55 const 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
67 const struct ypalias *
ypalias_init(void)68 ypalias_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;
107 out:
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