2 * Copyright (c) 1985, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
31 * Permission to use, copy, modify, and distribute this software for any
32 * purpose with or without fee is hereby granted, provided that the above
33 * copyright notice and this permission notice appear in all copies, and that
34 * the name of Digital Equipment Corporation not be used in advertising or
35 * publicity pertaining to distribution of the document or software without
36 * specific, written prior permission.
38 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
39 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
40 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
41 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
42 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
43 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
44 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
49 * @(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93
50 * $FreeBSD: src/lib/libc/net/getnetbydns.c,v 1.34 2007/01/09 00:28:02 imp Exp $
51 * $DragonFly: src/lib/libc/net/getnetbydns.c,v 1.5 2005/11/13 02:04:47 swildner Exp $
53 /* Portions Copyright (c) 1993 Carlos Leandro and Rui Salgueiro
54 * Dep. Matematica Universidade de Coimbra, Portugal, Europe
56 * Permission to use, copy, modify, and distribute this software for any
57 * purpose with or without fee is hereby granted, provided that the above
58 * copyright notice and this permission notice appear in all copies.
61 #include <sys/param.h>
62 #include <sys/socket.h>
63 #include <netinet/in.h>
64 #include <arpa/inet.h>
65 #include <arpa/nameser.h>
79 #include "netdb_private.h"
80 #include "res_config.h"
85 #define MAXPACKET (64*1024)
89 u_char buf[MAXPACKET];
98 * Reverse the order of first four dotted entries of in.
99 * Out must contain space for at least strlen(in) characters.
100 * The result does not include any leading 0s of in.
103 ipreverse(char *in, char *out)
111 /* Fill-in element positions and lengths: pos[], len[]. */
114 if (*p == '.' || *p == '\0') {
116 if (leading && p - start == 1 && *start == '0')
138 /* Copy the entries in reverse order */
141 for (i = 3; i >= 0; i--) {
142 memcpy(p, pos[i], len[i]);
146 /* Need a . separator? */
147 if (!leading && i > 0 && len[i - 1])
154 getnetanswer(querybuf *answer, int anslen, int net_i, struct netent *ne,
155 struct netent_data *ned, res_state statp)
162 int type, class, ancount, qdcount, haveanswer;
163 char aux[MAXHOSTNAMELEN];
164 char ans[MAXHOSTNAMELEN];
165 char *in, *bp, *ep, **ap;
168 * find first satisfactory answer
170 * answer --> +------------+ ( MESSAGE )
173 * | Question | the question for the name server
175 * | Answer | RRs answering the question
177 * | Authority | RRs pointing toward an authority
178 * | Additional | RRs holding additional information
181 eom = answer->buf + anslen;
183 ancount = ntohs(hp->ancount); /* #/records in the answer section */
184 qdcount = ntohs(hp->qdcount); /* #/entries in the question section */
186 ep = ned->netbuf + sizeof(ned->netbuf);
187 cp = answer->buf + HFIXEDSZ;
190 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
192 RES_SET_H_ERRNO(statp, TRY_AGAIN);
195 while (qdcount-- > 0)
196 cp += __dn_skipname(cp, eom) + QFIXEDSZ;
197 ap = ned->net_aliases;
199 ne->n_aliases = ned->net_aliases;
201 while (--ancount >= 0 && cp < eom) {
202 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
203 if ((n < 0) || !res_dnok(bp))
207 strncpy(&ans[0], bp, sizeof(ans) - 1);
208 ans[sizeof(ans) - 1] = '\0';
211 cp += INT32SZ; /* TTL */
213 if (class == C_IN && type == T_PTR) {
214 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
215 if ((n < 0) || !res_hnok(bp)) {
223 ne->n_addrtype = (class == C_IN) ? AF_INET : AF_UNSPEC;
231 ne->n_name = *ne->n_aliases;
238 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
242 strlcpy(bp, ans, ep - bp);
244 if (strlen(in) + 1 > sizeof(aux)) {
245 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
250 ne->n_net = inet_network(aux);
256 RES_SET_H_ERRNO(statp, TRY_AGAIN);
261 _dns_getnetbyaddr(void *rval, void *cb_data, va_list ap)
267 int *errnop, *h_errnop;
268 struct netent *nptr, ne;
269 struct netent_data *ned;
270 unsigned int netbr[4];
271 int nn, anslen, error;
277 net = va_arg(ap, uint32_t);
278 net_type = va_arg(ap, int);
279 nptr = va_arg(ap, struct netent *);
280 buffer = va_arg(ap, char *);
281 buflen = va_arg(ap, size_t);
282 errnop = va_arg(ap, int *);
283 h_errnop = va_arg(ap, int *);
285 statp = __res_state();
286 if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) {
287 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
288 *h_errnop = statp->res_h_errno;
292 if ((ned = __netent_data_init()) == NULL) {
293 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
294 *h_errnop = statp->res_h_errno;
298 *((struct netent **)rval) = NULL;
300 if (net_type != AF_INET) {
301 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
302 *h_errnop = statp->res_h_errno;
306 for (nn = 4, net2 = net; net2; net2 >>= 8)
307 netbr[--nn] = net2 & 0xff;
309 case 3: /* Class A */
310 sprintf(qbuf, "0.0.0.%u.in-addr.arpa", netbr[3]);
312 case 2: /* Class B */
313 sprintf(qbuf, "0.0.%u.%u.in-addr.arpa", netbr[3], netbr[2]);
315 case 1: /* Class C */
316 sprintf(qbuf, "0.%u.%u.%u.in-addr.arpa", netbr[3], netbr[2],
319 case 0: /* Class D - E */
320 sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa", netbr[3], netbr[2],
324 if ((buf = malloc(sizeof(*buf))) == NULL) {
325 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
326 *h_errnop = statp->res_h_errno;
327 return (NS_NOTFOUND);
329 anslen = res_nquery(statp, qbuf, C_IN, T_PTR, (u_char *)buf,
334 if (statp->options & RES_DEBUG)
335 printf("res_nsearch failed\n");
337 *h_errnop = statp->res_h_errno;
339 } else if (anslen > sizeof(*buf)) {
342 if (statp->options & RES_DEBUG)
343 printf("res_nsearch static buffer too small\n");
345 *h_errnop = statp->res_h_errno;
348 error = getnetanswer(buf, anslen, BYADDR, &ne, ned, statp);
351 /* Strip trailing zeros */
352 while ((net & 0xff) == 0 && net != 0)
355 if (__copy_netent(&ne, nptr, buffer, buflen) != 0) {
356 *h_errnop = statp->res_h_errno;
357 return (NS_NOTFOUND);
359 *((struct netent **)rval) = nptr;
362 *h_errnop = statp->res_h_errno;
363 return (NS_NOTFOUND);
367 _dns_getnetbyname(void *rval, void *cb_data, va_list ap)
372 int *errnop, *h_errnop;
373 struct netent *nptr, ne;
374 struct netent_data *ned;
380 net = va_arg(ap, const char *);
381 nptr = va_arg(ap, struct netent *);
382 buffer = va_arg(ap, char *);
383 buflen = va_arg(ap, size_t);
384 errnop = va_arg(ap, int *);
385 h_errnop = va_arg(ap, int *);
387 statp = __res_state();
388 if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) {
389 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
390 *h_errnop = statp->res_h_errno;
393 if ((ned = __netent_data_init()) == NULL) {
394 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
395 *h_errnop = statp->res_h_errno;
398 if ((buf = malloc(sizeof(*buf))) == NULL) {
399 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
400 *h_errnop = statp->res_h_errno;
401 return (NS_NOTFOUND);
404 *((struct netent **)rval) = NULL;
406 strncpy(qbuf, net, sizeof(qbuf) - 1);
407 qbuf[sizeof(qbuf) - 1] = '\0';
408 anslen = res_nsearch(statp, qbuf, C_IN, T_PTR, (u_char *)buf,
413 if (statp->options & RES_DEBUG)
414 printf("res_nsearch failed\n");
417 } else if (anslen > sizeof(*buf)) {
420 if (statp->options & RES_DEBUG)
421 printf("res_search static buffer too small\n");
425 error = getnetanswer(buf, anslen, BYNAME, &ne, ned, statp);
428 *h_errnop = statp->res_h_errno;
429 return (NS_NOTFOUND);
431 if (__copy_netent(&ne, nptr, buffer, buflen) != 0) {
432 *h_errnop = statp->res_h_errno;
433 return (NS_NOTFOUND);
435 *((struct netent **)rval) = nptr;
440 _setnetdnsent(int stayopen)
444 statp = __res_state();
445 if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1)
448 statp->options |= RES_STAYOPEN | RES_USEVC;
456 statp = __res_state();
457 statp->options &= ~(RES_STAYOPEN | RES_USEVC);