1 /* $NetBSD: h_hostent.c,v 1.2 2014/01/09 02:18:10 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2013 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31 #include <sys/cdefs.h>
32 __RCSID("$NetBSD: h_hostent.c,v 1.2 2014/01/09 02:18:10 christos Exp $");
33
34 #include <stdio.h>
35 #include <string.h>
36 #include <nsswitch.h>
37 #include <netdb.h>
38 #include <stdint.h>
39 #include <stdlib.h>
40 #include <unistd.h>
41 #include <err.h>
42
43 #include <netinet/in.h>
44 #include <sys/types.h>
45 #include <arpa/nameser.h>
46 #include <arpa/inet.h>
47
48 #include "hostent.h"
49
50 extern const char *__res_conf_name;
51
52 static void
phostent(const struct hostent * h)53 phostent(const struct hostent *h)
54 {
55 size_t i;
56 char buf[1024];
57 const int af = h->h_length == NS_INADDRSZ ? AF_INET : AF_INET6;
58
59 printf("name=%s, length=%d, addrtype=%d, aliases=[",
60 h->h_name, h->h_length, h->h_addrtype);
61
62 for (i = 0; h->h_aliases[i]; i++)
63 printf("%s%s", i == 0 ? "" : " ", h->h_aliases[i]);
64
65 printf("] addr_list=[");
66
67 for (i = 0; h->h_addr_list[i]; i++)
68 printf("%s%s", i == 0 ? "" : " ", inet_ntop(af,
69 h->h_addr_list[i], buf, (socklen_t)sizeof(buf)));
70
71 printf("]\n");
72 }
73
74 static void
usage(void)75 usage(void)
76 {
77 (void)fprintf(stderr, "Usage: %s [-f <hostsfile>] "
78 "[-t <any|dns|nis|files>] "
79 "[-46a] <name|address>\n", getprogname());
80 exit(EXIT_FAILURE);
81 }
82
83 static void
getby(int (* f)(void *,void *,va_list),struct getnamaddr * info,...)84 getby(int (*f)(void *, void *, va_list), struct getnamaddr *info, ...)
85 {
86 va_list ap;
87 int e;
88
89 va_start(ap, info);
90 e = (*f)(info, NULL, ap);
91 va_end(ap);
92 switch (e) {
93 case NS_SUCCESS:
94 phostent(info->hp);
95 break;
96 default:
97 printf("error %d\n", e);
98 break;
99 }
100 }
101
102 static void
geta(struct hostent * hp)103 geta(struct hostent *hp) {
104 if (hp == NULL)
105 printf("error %d\n", h_errno);
106 else
107 phostent(hp);
108 }
109
110 int
main(int argc,char * argv[])111 main(int argc, char *argv[])
112 {
113 int (*f)(void *, void *, va_list) = NULL;
114 const char *type = "any";
115 int c, af, e, byaddr, len;
116 struct hostent hent;
117 struct getnamaddr info;
118 char buf[4096];
119
120 af = AF_INET;
121 byaddr = 0;
122 len = 0;
123 info.hp = &hent;
124 info.buf = buf;
125 info.buflen = sizeof(buf);
126 info.he = &e;
127
128 while ((c = getopt(argc, argv, "46af:r:t:")) != -1) {
129 switch (c) {
130 case '4':
131 af = AF_INET;
132 break;
133 case '6':
134 af = AF_INET6;
135 break;
136 case 'a':
137 byaddr++;
138 break;
139 case 'f':
140 _hf_sethostsfile(optarg);
141 break;
142 case 'r':
143 __res_conf_name = optarg;
144 break;
145 case 't':
146 type = optarg;
147 break;
148 default:
149 usage();
150 }
151 }
152
153 argc -= optind;
154 argv += optind;
155
156 if (argc != 1)
157 usage();
158
159 switch (*type) {
160 case 'a':
161 break;
162 case 'd':
163 f = byaddr ? _dns_gethtbyaddr : _dns_gethtbyname;
164 break;
165 #ifdef YP
166 case 'n':
167 f = byaddr ? _yp_gethtbyaddr : _yp_gethtbyname;
168 break;
169 #endif
170 case 'f':
171 f = byaddr ? _hf_gethtbyaddr : _hf_gethtbyname;
172 break;
173 default:
174 errx(EXIT_FAILURE, "Unknown db type `%s'", type);
175 }
176
177 if (byaddr) {
178 struct in6_addr addr;
179 af = strchr(*argv, ':') ? AF_INET6 : AF_INET;
180 len = af == AF_INET ? NS_INADDRSZ : NS_IN6ADDRSZ;
181 if (inet_pton(af, *argv, &addr) == -1)
182 err(EXIT_FAILURE, "Can't parse `%s'", *argv);
183 if (*type == 'a')
184 geta(gethostbyaddr((const char *)&addr, len, af));
185 else
186 getby(f, &info, &addr, len, af);
187 } else {
188 if (*type == 'a')
189 geta(gethostbyname2(*argv, af));
190 else
191 getby(f, &info, *argv, len, af);
192 }
193
194 return 0;
195 }
196