1/*
2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (c) 1995-1999 by Internet Software Consortium.
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *

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13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
15 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18#if defined(LIBC_SCCS) && !defined(lint)
19static const char rcsid[] = "$Id: res_data.c,v 1.1.206.2 2004/03/16 12:34:18 marka Exp $";
20#endif /* LIBC_SCCS and not lint */
21
22#include "port_before.h"
23
24#include <sys/types.h>
25#include <sys/param.h>
26#include <sys/socket.h>
27#include <sys/time.h>
28
29#include <netinet/in.h>
30#include <arpa/inet.h>
31#include <arpa/nameser.h>
32
33#include <ctype.h>
34#include <netdb.h>
35#include <resolv.h>
36#include <res_update.h>
37#include <stdio.h>
38#include <stdlib.h>
39#include <string.h>
40#include <unistd.h>
41
42#include "port_after.h"
43#undef _res
44
45const char *_res_opcodes[] = {
46 "QUERY",
47 "IQUERY",
48 "CQUERYM",
49 "CQUERYU", /* experimental */
50 "NOTIFY", /* experimental */
51 "UPDATE",

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66 "ZONE",
67 "PREREQUISITES",
68 "UPDATE",
69 "ADDITIONAL",
70};
71#endif
72
73#ifndef __BIND_NOSTATIC
74struct __res_state _res
75# if defined(__BIND_RES_TEXT)
76 = { RES_TIMEOUT, } /* Motorola, et al. */
77# endif
78 ;
79
80/* Proto. */
81
82int res_ourserver_p(const res_state, const struct sockaddr_in *);
83
84int
85res_init(void) {
86 extern int __res_vinit(res_state, int);

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102 * before res_init() was first called. We can't replicate that semantic
103 * with dynamic initialization (they may have turned bits off that are
104 * set in RES_DEFAULT). Our solution is to declare such applications
105 * "broken". They could fool us by setting RES_INIT but none do (yet).
106 */
107 if (!_res.retrans)
108 _res.retrans = RES_TIMEOUT;
109 if (!_res.retry)
110 _res.retry = 4;
111 if (!(_res.options & RES_INIT))
112 _res.options = RES_DEFAULT;
113
114 /*
115 * This one used to initialize implicitly to zero, so unless the app
116 * has set it to something in particular, we can randomize it now.
117 */
118 if (!_res.id)

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153 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
154 return (-1);
155 }
156 return (res_nmkquery(&_res, op, dname, class, type,
157 data, datalen,
158 newrr_in, buf, buflen));
159}
160
161int
162res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) {
163 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
164 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
165 return (-1);
166 }
167
168 return (res_nmkupdate(&_res, rrecp_in, buf, buflen));
169}
170
171int
172res_query(const char *name, /* domain name */
173 int class, int type, /* class and type of query */
174 u_char *answer, /* buffer to put answer */
175 int anslen) /* size of answer buffer */
176{
177 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
178 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
179 return (-1);
180 }
181 return (res_nquery(&_res, name, class, type, answer, anslen));
182}
183
184void
185res_send_setqhook(res_send_qhook hook) {
186 _res.qhook = hook;
187}
188
189void
190res_send_setrhook(res_send_rhook hook) {
191 _res.rhook = hook;
192}
193
194int
195res_isourserver(const struct sockaddr_in *inp) {
196 return (res_ourserver_p(&_res, inp));
197}
198
199int
200res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) {
201 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
202 /* errno should have been set by res_init() in this case. */
203 return (-1);
204 }
205
206 return (res_nsend(&_res, buf, buflen, ans, anssiz));
207}
208
209int
210res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key,
211 u_char *ans, int anssiz)
212{
213 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
214 /* errno should have been set by res_init() in this case. */
215 return (-1);
216 }
217
218 return (res_nsendsigned(&_res, buf, buflen, key, ans, anssiz));
219}
220
221void
222res_close(void) {
223 res_nclose(&_res);
224}
225
226int
227res_update(ns_updrec *rrecp_in) {
228 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
229 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
230 return (-1);
231 }
232
233 return (res_nupdate(&_res, rrecp_in, NULL));
234}
235
236int
237res_search(const char *name, /* domain name */
238 int class, int type, /* class and type of query */
239 u_char *answer, /* buffer to put answer */
240 int anslen) /* size of answer */
241{
242 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {

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259 return (-1);
260 }
261
262 return (res_nquerydomain(&_res, name, domain,
263 class, type,
264 answer, anslen));
265}
266
267const char *
268hostalias(const char *name) {
269 static char abuf[MAXDNAME];
270
271 return (res_hostalias(&_res, name, abuf, sizeof abuf));
272}
273
274#ifdef ultrix

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283 if (len_host > len_domain &&
284 !strcasecmp(hostname + len_host - len_domain, _res.defdname) &&
285 hostname[len_host - len_domain - 1] == '.')
286 return (len_host - len_domain - 1);
287 return (0);
288}
289#endif /*ultrix*/
290
291#endif