Bring the prototype of gethostbyaddr(3) in line with the standard.
[dragonfly.git] / lib / libc / net / gethostnamadr.c
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1/*-
2 * Copyright (c) 1994, Garrett Wollman
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
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24 *
25 * $FreeBSD: src/lib/libc/net/gethostnamadr.c,v 1.15.2.2 2001/03/05 10:40:42 obrien Exp $
ad975142 26 * $DragonFly: src/lib/libc/net/gethostnamadr.c,v 1.6 2007/12/29 22:55:29 matthias Exp $
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27 */
28
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29#include <sys/param.h>
30#include <sys/socket.h>
31#include <netinet/in.h>
32#include <arpa/inet.h>
33#include <netdb.h>
34#include <stdio.h>
35#include <ctype.h>
36#include <string.h>
37#include <arpa/nameser.h> /* XXX hack for _res */
38#include <resolv.h> /* XXX hack for _res */
39
40#define _PATH_HOSTCONF "/etc/host.conf"
41
42enum service_type {
43 SERVICE_NONE = 0,
44 SERVICE_BIND,
45 SERVICE_HOSTS,
46 SERVICE_NIS };
47#define SERVICE_MAX SERVICE_NIS
48
49static struct {
50 const char *name;
51 enum service_type type;
52} service_names[] = {
53 { "hosts", SERVICE_HOSTS },
54 { "/etc/hosts", SERVICE_HOSTS },
55 { "hosttable", SERVICE_HOSTS },
56 { "htable", SERVICE_HOSTS },
57 { "bind", SERVICE_BIND },
58 { "dns", SERVICE_BIND },
59 { "domain", SERVICE_BIND },
60 { "yp", SERVICE_NIS },
61 { "yellowpages", SERVICE_NIS },
62 { "nis", SERVICE_NIS },
63 { 0, SERVICE_NONE }
64};
65
66static enum service_type service_order[SERVICE_MAX + 1];
67static int service_done = 0;
68
69static enum service_type
70get_service_name(const char *name) {
71 int i;
72 for(i = 0; service_names[i].type != SERVICE_NONE; i++) {
73 if(!strcasecmp(name, service_names[i].name)) {
74 return service_names[i].type;
75 }
76 }
77 return SERVICE_NONE;
78}
79
80static void
076e5234 81init_services(void)
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82{
83 char *cp, *p, buf[BUFSIZ];
660c873b 84 int cc = 0;
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85 FILE *fd;
86
87 if ((fd = (FILE *)fopen(_PATH_HOSTCONF, "r")) == NULL) {
88 /* make some assumptions */
89 service_order[0] = SERVICE_BIND;
90 service_order[1] = SERVICE_HOSTS;
91 service_order[2] = SERVICE_NONE;
92 } else {
93 while (fgets(buf, BUFSIZ, fd) != NULL && cc < SERVICE_MAX) {
94 if(buf[0] == '#')
95 continue;
96
97 p = buf;
98 while ((cp = strsep(&p, "\n \t,:;")) != NULL && *cp == '\0')
99 ;
100 if (cp == NULL)
101 continue;
102 do {
103 if (isalpha((unsigned char)cp[0])) {
104 service_order[cc] = get_service_name(cp);
105 if(service_order[cc] != SERVICE_NONE)
106 cc++;
107 }
108 while ((cp = strsep(&p, "\n \t,:;")) != NULL && *cp == '\0')
109 ;
110 } while(cp != NULL && cc < SERVICE_MAX);
111 }
112 service_order[cc] = SERVICE_NONE;
113 fclose(fd);
114 }
115 service_done = 1;
116}
117
118struct hostent *
119gethostbyname(const char *name)
120{
121 struct hostent *hp;
122
123 if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
124 h_errno = NETDB_INTERNAL;
125 return (NULL);
126 }
127 if (_res.options & RES_USE_INET6) { /* XXX */
128 hp = gethostbyname2(name, AF_INET6); /* XXX */
129 if (hp) /* XXX */
130 return (hp); /* XXX */
131 } /* XXX */
132 return (gethostbyname2(name, AF_INET));
133}
134
135struct hostent *
136gethostbyname2(const char *name, int type)
137{
138 struct hostent *hp = 0;
139 int nserv = 0;
140
141 if (!service_done)
142 init_services();
143
144 while (!hp) {
145 switch (service_order[nserv]) {
146 case SERVICE_NONE:
147 return NULL;
148 case SERVICE_HOSTS:
149 hp = _gethostbyhtname(name, type);
150 break;
151 case SERVICE_BIND:
152 hp = _gethostbydnsname(name, type);
153 break;
154 case SERVICE_NIS:
155 hp = _gethostbynisname(name, type);
156 break;
157 }
158 nserv++;
159 }
160 return hp;
161}
162
163struct hostent *
f4e6f5e2 164gethostbyaddr(const void *addr, socklen_t len, int type)
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165{
166 struct hostent *hp = 0;
167 int nserv = 0;
168
169 if (!service_done)
170 init_services();
171
172 while (!hp) {
173 switch (service_order[nserv]) {
174 case SERVICE_NONE:
175 return 0;
176 case SERVICE_HOSTS:
177 hp = _gethostbyhtaddr(addr, len, type);
178 break;
179 case SERVICE_BIND:
180 hp = _gethostbydnsaddr(addr, len, type);
181 break;
182 case SERVICE_NIS:
183 hp = _gethostbynisaddr(addr, len, type);
184 break;
185 }
186 nserv++;
187 }
188 return hp;
189}
190
984263bc 191void
076e5234 192sethostent(int stayopen)
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193{
194 _sethosthtent(stayopen);
195 _sethostdnsent(stayopen);
196}
197
198void
076e5234 199endhostent(void)
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200{
201 _endhosthtent();
202 _endhostdnsent();
203}