1/*
2 * Copyright (c) 1995-1999 by Internet Software Consortium.
3 *
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
9 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
10 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
11 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
12 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
13 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
14 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
15 * SOFTWARE.
16 */
17
18#include <sys/types.h>
19#include <sys/param.h>
20#include <sys/socket.h>
21#include <sys/time.h>
22
23#include <netinet/in.h>
24#include <arpa/inet.h>
25#include <arpa/nameser.h>
26
27#include <ctype.h>
28#include <netdb.h>
29#include <resolv.h>
30#include <stdio.h>
31#include <stdlib.h>
32#include <string.h>
33#include <unistd.h>
34
35const char *_res_opcodes[] = {
36 "QUERY",
37 "IQUERY",
38 "CQUERYM",
39 "CQUERYU", /* experimental */
40 "NOTIFY", /* experimental */
41 "UPDATE",
42 "6",
43 "7",
44 "8",
45 "9",
46 "10",
47 "11",
48 "12",
49 "13",
50 "ZONEINIT",
51 "ZONEREF",
52};
53libresolv_hidden_data_def (_res_opcodes)
54
55void
56p_query(const u_char *msg) {
57 fp_query(msg, stdout);
58}
59
60void
61fp_query(const u_char *msg, FILE *file) {
62 fp_nquery(msg, PACKETSZ, file);
63}
64libresolv_hidden_def (fp_query)
65
66void
67fp_nquery(const u_char *msg, int len, FILE *file) {
68 if (__res_maybe_init (&_res, 0) == -1)
69 return;
70
71 res_pquery(&_res, msg, len, file);
72}
73libresolv_hidden_def (fp_nquery)
74
75int
76res_mkquery(int op, /* opcode of query */
77 const char *dname, /* domain name */
78 int class, int type, /* class and type of query */
79 const u_char *data, /* resource record data */
80 int datalen, /* length of data */
81 const u_char *newrr_in, /* new rr for modify or append */
82 u_char *buf, /* buffer to put query */
83 int buflen) /* size of buffer */
84{
85 if (__res_maybe_init (&_res, 1) == -1) {
86 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
87 return (-1);
88 }
89 return (res_nmkquery(&_res, op, dname, class, type,
90 data, datalen,
91 newrr_in, buf, buflen));
92}
93
94int
95res_query(const char *name, /* domain name */
96 int class, int type, /* class and type of query */
97 u_char *answer, /* buffer to put answer */
98 int anslen) /* size of answer buffer */
99{
100 if (__res_maybe_init (&_res, 1) == -1) {
101 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
102 return (-1);
103 }
104 return (res_nquery(&_res, name, class, type, answer, anslen));
105}
106
107void
108res_send_setqhook(res_send_qhook hook) {
109 _res.qhook = hook;
110}
111
112void
113res_send_setrhook(res_send_rhook hook) {
114 _res.rhook = hook;
115}
116
117int
118res_isourserver(const struct sockaddr_in *inp) {
119 return (res_ourserver_p(&_res, (const struct sockaddr_in6 *) inp));
120}
121
122int
123res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) {
124 if (__res_maybe_init (&_res, 1) == -1) {
125 /* errno should have been set by res_init() in this case. */
126 return (-1);
127 }
128
129 return (res_nsend(&_res, buf, buflen, ans, anssiz));
130}
131
132
133void
134res_close(void) {
135 /*
136 * Some stupid programs out there call res_close() before res_init().
137 * Since _res._vcsock isn't explicitly initialized, these means that
138 * we could do a close(0), which might lead to some security problems.
139 * Therefore we check if res_init() was called before by looking at
140 * the RES_INIT bit in _res.options. If it hasn't been set we bail out
141 * early. */
142 if ((_res.options & RES_INIT) == 0)
143 return;
144 /* We don't free the name server addresses because we never
145 did it and it would be done implicitly on shutdown. */
146 __res_iclose(&_res, false);
147}
148
149int
150res_search(const char *name, /* domain name */
151 int class, int type, /* class and type of query */
152 u_char *answer, /* buffer to put answer */
153 int anslen) /* size of answer */
154{
155 if (__res_maybe_init (&_res, 1) == -1) {
156 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
157 return (-1);
158 }
159
160 return (res_nsearch(&_res, name, class, type, answer, anslen));
161}
162
163int
164res_querydomain(const char *name,
165 const char *domain,
166 int class, int type, /* class and type of query */
167 u_char *answer, /* buffer to put answer */
168 int anslen) /* size of answer */
169{
170 if (__res_maybe_init (&_res, 1) == -1) {
171 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
172 return (-1);
173 }
174
175 return (res_nquerydomain(&_res, name, domain,
176 class, type,
177 answer, anslen));
178}
179
180const char *
181hostalias(const char *name) {
182 static char abuf[MAXDNAME];
183
184 return (res_hostalias(&_res, name, abuf, sizeof abuf));
185}
186libresolv_hidden_def (hostalias)
187
188
189
190#include <shlib-compat.h>
191
192#if SHLIB_COMPAT(libresolv, GLIBC_2_0, GLIBC_2_2)
193# undef res_mkquery
194# undef res_query
195# undef res_querydomain
196# undef res_search
197weak_alias (__res_mkquery, res_mkquery);
198weak_alias (__res_query, res_query);
199weak_alias (__res_querydomain, res_querydomain);
200weak_alias (__res_search, res_search);
201#endif
202