1/*	$NetBSD$	*/
2
3/*
4 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
5 * Copyright (c) 1995-1999 by Internet Software Consortium.
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
17 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20#if defined(LIBC_SCCS) && !defined(lint)
21static const char rcsid[] = "Id: res_data.c,v 1.7 2008/12/11 09:59:00 marka Exp ";
22#endif /* LIBC_SCCS and not lint */
23
24#include "port_before.h"
25
26#include <sys/types.h>
27#include <sys/param.h>
28#include <sys/socket.h>
29#include <sys/time.h>
30
31#include <netinet/in.h>
32#include <arpa/inet.h>
33#include <arpa/nameser.h>
34
35#include <ctype.h>
36#include <netdb.h>
37#include <resolv.h>
38#include <res_update.h>
39#include <stdio.h>
40#include <stdlib.h>
41#include <string.h>
42#include <unistd.h>
43
44#include "port_after.h"
45
46const char *_res_opcodes[] = {
47	"QUERY",
48	"IQUERY",
49	"CQUERYM",
50	"CQUERYU",	/*%< experimental */
51	"NOTIFY",	/*%< experimental */
52	"UPDATE",
53	"6",
54	"7",
55	"8",
56	"9",
57	"10",
58	"11",
59	"12",
60	"13",
61	"ZONEINIT",
62	"ZONEREF",
63};
64
65#ifdef BIND_UPDATE
66const char *_res_sectioncodes[] = {
67	"ZONE",
68	"PREREQUISITES",
69	"UPDATE",
70	"ADDITIONAL",
71};
72#endif
73
74#undef _res
75#ifndef __BIND_NOSTATIC
76struct __res_state _res
77# if defined(__BIND_RES_TEXT)
78	= { RES_TIMEOUT, }	/*%< Motorola, et al. */
79# endif
80        ;
81
82#if defined(DO_PTHREADS) || defined(__linux)
83#define _res (*__res_state())
84#endif
85
86/* Proto. */
87
88int  res_ourserver_p(const res_state, const struct sockaddr_in *);
89
90int
91res_init(void) {
92	extern int __res_vinit(res_state, int);
93
94	/*
95	 * These three fields used to be statically initialized.  This made
96	 * it hard to use this code in a shared library.  It is necessary,
97	 * now that we're doing dynamic initialization here, that we preserve
98	 * the old semantics: if an application modifies one of these three
99	 * fields of _res before res_init() is called, res_init() will not
100	 * alter them.  Of course, if an application is setting them to
101	 * _zero_ before calling res_init(), hoping to override what used
102	 * to be the static default, we can't detect it and unexpected results
103	 * will follow.  Zero for any of these fields would make no sense,
104	 * so one can safely assume that the applications were already getting
105	 * unexpected results.
106	 *
107	 * _res.options is tricky since some apps were known to diddle the bits
108	 * before res_init() was first called. We can't replicate that semantic
109	 * with dynamic initialization (they may have turned bits off that are
110	 * set in RES_DEFAULT).  Our solution is to declare such applications
111	 * "broken".  They could fool us by setting RES_INIT but none do (yet).
112	 */
113	if (!_res.retrans)
114		_res.retrans = RES_TIMEOUT;
115	if (!_res.retry)
116		_res.retry = 4;
117	if (!(_res.options & RES_INIT))
118		_res.options = RES_DEFAULT;
119
120	/*
121	 * This one used to initialize implicitly to zero, so unless the app
122	 * has set it to something in particular, we can randomize it now.
123	 */
124	if (!_res.id)
125		_res.id = res_nrandomid(&_res);
126
127	return (__res_vinit(&_res, 1));
128}
129
130void
131p_query(const u_char *msg) {
132	fp_query(msg, stdout);
133}
134
135void
136fp_query(const u_char *msg, FILE *file) {
137	fp_nquery(msg, PACKETSZ, file);
138}
139
140void
141fp_nquery(const u_char *msg, int len, FILE *file) {
142	if ((_res.options & RES_INIT) == 0U && res_init() == -1)
143		return;
144
145	res_pquery(&_res, msg, len, file);
146}
147
148int
149res_mkquery(int op,			/*!< opcode of query  */
150	    const char *dname,		/*!< domain name  */
151	    int class, int type,	/*!< class and type of query  */
152	    const u_char *data,		/*!< resource record data  */
153	    int datalen,		/*!< length of data  */
154	    const u_char *newrr_in,	/*!< new rr for modify or append  */
155	    u_char *buf,		/*!< buffer to put query  */
156	    int buflen)			/*!< size of buffer  */
157{
158	if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
159		RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
160		return (-1);
161	}
162	return (res_nmkquery(&_res, op, dname, class, type,
163			     data, datalen,
164			     newrr_in, buf, buflen));
165}
166
167int
168res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) {
169	if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
170		RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
171		return (-1);
172	}
173
174	return (res_nmkupdate(&_res, rrecp_in, buf, buflen));
175}
176
177int
178res_query(const char *name,	/*!< domain name  */
179	  int class, int type,	/*!< class and type of query  */
180	  u_char *answer,	/*!< buffer to put answer  */
181	  int anslen)		/*!< size of answer buffer  */
182{
183	if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
184		RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
185		return (-1);
186	}
187	return (res_nquery(&_res, name, class, type, answer, anslen));
188}
189
190void
191res_send_setqhook(res_send_qhook hook) {
192	_res.qhook = hook;
193}
194
195void
196res_send_setrhook(res_send_rhook hook) {
197	_res.rhook = hook;
198}
199
200int
201res_isourserver(const struct sockaddr_in *inp) {
202	return (res_ourserver_p(&_res, inp));
203}
204
205int
206res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) {
207	if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
208		/* errno should have been set by res_init() in this case. */
209		return (-1);
210	}
211
212	return (res_nsend(&_res, buf, buflen, ans, anssiz));
213}
214
215int
216res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key,
217	       u_char *ans, int anssiz)
218{
219	if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
220		/* errno should have been set by res_init() in this case. */
221		return (-1);
222	}
223
224	return (res_nsendsigned(&_res, buf, buflen, key, ans, anssiz));
225}
226
227void
228res_close(void) {
229	res_nclose(&_res);
230}
231
232int
233res_update(ns_updrec *rrecp_in) {
234	if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
235		RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
236		return (-1);
237	}
238
239	return (res_nupdate(&_res, rrecp_in, NULL));
240}
241
242int
243res_search(const char *name,	/*!< domain name  */
244	   int class, int type,	/*!< class and type of query  */
245	   u_char *answer,	/*!< buffer to put answer  */
246	   int anslen)		/*!< size of answer  */
247{
248	if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
249		RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
250		return (-1);
251	}
252
253	return (res_nsearch(&_res, name, class, type, answer, anslen));
254}
255
256int
257res_querydomain(const char *name,
258		const char *domain,
259		int class, int type,	/*!< class and type of query  */
260		u_char *answer,		/*!< buffer to put answer  */
261		int anslen)		/*!< size of answer  */
262{
263	if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
264		RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
265		return (-1);
266	}
267
268	return (res_nquerydomain(&_res, name, domain,
269				 class, type,
270				 answer, anslen));
271}
272
273u_int
274res_randomid(void) {
275	if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
276		RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
277		return (-1);
278	}
279
280	return (res_nrandomid(&_res));
281}
282
283const char *
284hostalias(const char *name) {
285	static char abuf[MAXDNAME];
286
287	return (res_hostalias(&_res, name, abuf, sizeof abuf));
288}
289
290#ifdef ultrix
291int
292local_hostname_length(const char *hostname) {
293	int len_host, len_domain;
294
295	if (!*_res.defdname)
296		res_init();
297	len_host = strlen(hostname);
298	len_domain = strlen(_res.defdname);
299	if (len_host > len_domain &&
300	    !strcasecmp(hostname + len_host - len_domain, _res.defdname) &&
301	    hostname[len_host - len_domain - 1] == '.')
302		return (len_host - len_domain - 1);
303	return (0);
304}
305#endif /*ultrix*/
306
307#endif
308
309/*! \file */
310