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1/* $OpenBSD: getnetnamadr.c,v 1.10 1997/12/02 01:34:05 deraadt Exp $ */
2
3/*
4 * Copyright (c) 1997, Jason Downs. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by Jason Downs for the
17 * OpenBSD system.
18 * 4. Neither the name(s) of the author(s) nor the name OpenBSD
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS
23 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
24 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
25 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT,
26 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
27 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
28 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
29 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34/* Copyright (c) 1993 Carlos Leandro and Rui Salgueiro
35 * Dep. Matematica Universidade de Coimbra, Portugal, Europe
36 *
37 * Permission to use, copy, modify, and distribute this software for any
38 * purpose with or without fee is hereby granted, provided that the above
39 * copyright notice and this permission notice appear in all copies.
40 */
41/*
42 * Copyright (c) 1983, 1993
43 * The Regents of the University of California. All rights reserved.
44 *
45 * Redistribution and use in source and binary forms, with or without
46 * modification, are permitted provided that the following conditions
47 * are met:
48 * 1. Redistributions of source code must retain the above copyright
49 * notice, this list of conditions and the following disclaimer.
50 * 2. Redistributions in binary form must reproduce the above copyright
51 * notice, this list of conditions and the following disclaimer in the
52 * documentation and/or other materials provided with the distribution.
53 * 3. All advertising materials mentioning features or use of this software
54 * must display the following acknowledgement:
55 * This product includes software developed by the University of
56 * California, Berkeley and its contributors.
57 * 4. Neither the name of the University nor the names of its contributors
58 * may be used to endorse or promote products derived from this software
59 * without specific prior written permission.
60 *
61 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
62 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
63 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
64 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
65 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
66 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
67 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
68 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
69 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
70 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
71 * SUCH DAMAGE.
72 */
73
74#if defined(LIBC_SCCS) && !defined(lint)
75#if 0
76static char sccsid[] = "@(#)getnetbyaddr.c 8.1 (Berkeley) 6/4/93";
77static char sccsid_[] = "from getnetnamadr.c 1.4 (Coimbra) 93/06/03";
78static char rcsid[] = "$From: getnetnamadr.c,v 8.7 1996/08/05 08:31:35 vixie Exp $";
79#else
80static char rcsid[] = "$OpenBSD: getnetnamadr.c,v 1.10 1997/12/02 01:34:05 deraadt Exp $";
81#endif
82#endif /* LIBC_SCCS and not lint */
83
84#include <sys/types.h>
85#include <sys/param.h>
86#include <sys/socket.h>
87#include <netinet/in.h>
88#include <arpa/inet.h>
89#include <arpa/nameser.h>
90
91#include <stdio.h>
92#include <netdb.h>
93#include <resolv.h>
94#include <ctype.h>
95#include <errno.h>
96#include <string.h>
97
98extern int h_errno;
99
100struct netent *_getnetbyaddr __P((in_addr_t net, int type));
101struct netent *_getnetbyname __P((const char *name));
102
103int _hokchar __P((const char *));
104
105#define BYADDR 0
106#define BYNAME 1
107#define MAXALIASES 35
108
109#if PACKETSZ > 1024
110#define MAXPACKET PACKETSZ
111#else
112#define MAXPACKET 1024
113#endif
114
115typedef union {
116 HEADER hdr;
117 u_char buf[MAXPACKET];
118} querybuf;
119
120typedef union {
121 long al;
122 char ac;
123} align;
124
125static struct netent *
126getnetanswer(answer, anslen, net_i)
127 querybuf *answer;
128 int anslen;
129 int net_i;
130{
131
132 register HEADER *hp;
133 register u_char *cp;
134 register int n;
135 u_char *eom;
136 int type, class, buflen, ancount, qdcount, haveanswer, i, nchar;
137 char aux1[MAXHOSTNAMELEN], aux2[MAXHOSTNAMELEN], ans[MAXHOSTNAMELEN];
138 char *in, *st, *pauxt, *bp, **ap;
139 char *paux1 = &aux1[0], *paux2 = &aux2[0], flag = 0;
140 static struct netent net_entry;
141 static char *net_aliases[MAXALIASES], netbuf[BUFSIZ+1];
142
143 /*
144 * find first satisfactory answer
145 *
146 * answer --> +------------+ ( MESSAGE )
147 * | Header |
148 * +------------+
149 * | Question | the question for the name server
150 * +------------+
151 * | Answer | RRs answering the question
152 * +------------+
153 * | Authority | RRs pointing toward an authority
154 * | Additional | RRs holding additional information
155 * +------------+
156 */
157 eom = answer->buf + anslen;
158 hp = &answer->hdr;
159 ancount = ntohs(hp->ancount); /* #/records in the answer section */
160 qdcount = ntohs(hp->qdcount); /* #/entries in the question section */
161 bp = netbuf;
162 buflen = sizeof(netbuf);
163 cp = answer->buf + HFIXEDSZ;
164 if (!qdcount) {
165 if (hp->aa)
166 h_errno = HOST_NOT_FOUND;
167 else
168 h_errno = TRY_AGAIN;
169 return (NULL);
170 }
171 while (qdcount-- > 0)
172 cp += __dn_skipname(cp, eom) + QFIXEDSZ;
173 ap = net_aliases;
174 *ap = NULL;
175 net_entry.n_aliases = net_aliases;
176 haveanswer = 0;
177 while (--ancount >= 0 && cp < eom) {
178 n = dn_expand(answer->buf, eom, cp, bp, buflen);
179#ifdef USE_RESOLV_NAME_OK
180 if ((n < 0) || !res_dnok(bp))
181#else
182 if ((n < 0) || !_hokchar(bp))
183#endif
184 break;
185 cp += n;
186 ans[0] = '\0';
187 (void)strncpy(&ans[0], bp, sizeof ans-1);
188 ans[sizeof ans-1] = '\0';
189 GETSHORT(type, cp);
190 GETSHORT(class, cp);
191 cp += INT32SZ; /* TTL */
192 GETSHORT(n, cp);
193 if (class == C_IN && type == T_PTR) {
194 n = dn_expand(answer->buf, eom, cp, bp, buflen);
195 if ((n < 0) || !res_hnok(bp)) {
196 cp += n;
197 return (NULL);
198 }
199 cp += n;
200 *ap++ = bp;
201 bp += strlen(bp) + 1;
202 net_entry.n_addrtype =
203 (class == C_IN) ? AF_INET : AF_UNSPEC;
204 haveanswer++;
205 }
206 }
207 if (haveanswer) {
208 *ap = NULL;
209 switch (net_i) {
210 case BYADDR:
211 net_entry.n_name = *net_entry.n_aliases;
212 net_entry.n_net = 0L;
213 break;
214 case BYNAME:
215 in = *net_entry.n_aliases;
216 net_entry.n_name = &ans[0];
217 aux2[0] = '\0';
218 for (i = 0; i < 4; i++) {
219 for (st = in, nchar = 0;
220 *st != '.';
221 st++, nchar++)
222 ;
223 if (nchar != 1 || *in != '0' || flag) {
224 flag = 1;
225 (void)strncpy(paux1,
226 (i==0) ? in : in-1,
227 (i==0) ?nchar : nchar+1);
228 paux1[(i==0) ? nchar : nchar+1] = '\0';
229 pauxt = paux2;
230 paux2 = strcat(paux1, paux2);
231 paux1 = pauxt;
232 }
233 in = ++st;
234 }
235 net_entry.n_net = inet_network(paux2);
236 break;
237 }
238 net_entry.n_aliases++;
239 return (&net_entry);
240 }
241 h_errno = TRY_AGAIN;
242 return (NULL);
243}
244
245struct netent *
246getnetbyaddr(net, net_type)
247 register in_addr_t net;
248 register int net_type;
249{
250 unsigned int netbr[4];
251 int nn, anslen;
252 querybuf buf;
253 char qbuf[MAXDNAME];
254 in_addr_t net2;
255 struct netent *net_entry = NULL;
256 char lookups[MAXDNSLUS];
257 int i;
258
259 if ((_res.options & RES_INIT) == 0 && res_init() == -1)
260 return(_getnetbyaddr(net, net_type));
261
262 bcopy(_res.lookups, lookups, sizeof lookups);
263 if (lookups[0] == '\0')
264 strncpy(lookups, "bf", sizeof lookups);
265
266 for (i = 0; i < MAXDNSLUS && lookups[i]; i++) {
267 switch (lookups[i]) {
268#ifdef YP
269 case 'y':
270 /* There is no YP support. */
271 break;
272#endif /* YP */
273 case 'b':
274 if (net_type != AF_INET)
275 break; /* DNS only supports AF_INET? */
276
277 for (nn = 4, net2 = net; net2; net2 >>= 8)
278 netbr[--nn] = net2 & 0xff;
279 switch (nn) {
280 case 3: /* Class A */
281 snprintf(qbuf, sizeof(qbuf),
282 "0.0.0.%u.in-addr.arpa", netbr[3]);
283 break;
284 case 2: /* Class B */
285 snprintf(qbuf, sizeof(qbuf),
286 "0.0.%u.%u.in-addr.arpa",
287 netbr[3], netbr[2]);
288 break;
289 case 1: /* Class C */
290 snprintf(qbuf, sizeof(qbuf),
291 "0.%u.%u.%u.in-addr.arpa",
292 netbr[3], netbr[2], netbr[1]);
293 break;
294 case 0: /* Class D - E */
295 snprintf(qbuf, sizeof(qbuf),
296 "%u.%u.%u.%u.in-addr.arpa",
297 netbr[3], netbr[2], netbr[1], netbr[0]);
298 break;
299 }
300 anslen = res_query(qbuf, C_IN, T_PTR, (u_char *)&buf,
301 sizeof(buf));
302 if (anslen < 0) {
303#ifdef DEBUG
304 if (_res.options & RES_DEBUG)
305 printf("res_query failed\n");
306#endif
307 break;
308 }
309 net_entry = getnetanswer(&buf, anslen, BYADDR);
310 if (net_entry != NULL) {
311 unsigned u_net = net; /* maybe net should be unsigned ? */
312
313 /* Strip trailing zeros */
314 while ((u_net & 0xff) == 0 && u_net != 0)
315 u_net >>= 8;
316 net_entry->n_net = u_net;
317 return (net_entry);
318 }
319 break;
320 case 'f':
321 net_entry = _getnetbyaddr(net, net_type);
322 if (net_entry != NULL)
323 return (net_entry);
324 }
325 }
326
327 /* Nothing matched. */
328 return (NULL);
329}
330
331struct netent *
332getnetbyname(net)
333 register const char *net;
334{
335 int anslen;
336 querybuf buf;
337 char qbuf[MAXDNAME];
338 struct netent *net_entry = NULL;
339 char lookups[MAXDNSLUS];
340 int i;
341
342 if ((_res.options & RES_INIT) == 0 && res_init() == -1)
343 return (_getnetbyname(net));
344
345 bcopy(_res.lookups, lookups, sizeof lookups);
346 if (lookups[0] == '\0')
347 strncpy(lookups, "bf", sizeof lookups);
348
349 for (i = 0; i < MAXDNSLUS && lookups[i]; i++) {
350 switch (lookups[i]) {
351#ifdef YP
352 case 'y':
353 /* There is no YP support. */
354 break;
355#endif /* YP */
356 case 'b':
357 strncpy(qbuf, net, sizeof qbuf-1);
358 qbuf[sizeof qbuf-1] = '\0';
359 anslen = res_search(qbuf, C_IN, T_PTR, (u_char *)&buf,
360 sizeof(buf));
361 if (anslen < 0) {
362#ifdef DEBUG
363 if (_res.options & RES_DEBUG)
364 printf("res_query failed\n");
365#endif
366 break;
367 }
368 net_entry = getnetanswer(&buf, anslen, BYNAME);
369 if (net_entry != NULL)
370 return (net_entry);
371 break;
372 case 'f':
373 net_entry = _getnetbyname(net);
374 if (net_entry != NULL)
375 return (net_entry);
376 break;
377 }
378 }
379
380 /* Nothing matched. */
381 return (NULL);
382}
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