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-rw-r--r--src/lib/libc/net/res_mkquery.c241
1 files changed, 241 insertions, 0 deletions
diff --git a/src/lib/libc/net/res_mkquery.c b/src/lib/libc/net/res_mkquery.c
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index 0000000000..a6c37379f9
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+++ b/src/lib/libc/net/res_mkquery.c
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1/* $OpenBSD: res_mkquery.c,v 1.16 2005/03/30 02:58:28 tedu Exp $ */
2
3/*
4 * ++Copyright++ 1985, 1993
5 * -
6 * Copyright (c) 1985, 1993
7 * The Regents of the University of California. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 * -
33 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
34 *
35 * Permission to use, copy, modify, and distribute this software for any
36 * purpose with or without fee is hereby granted, provided that the above
37 * copyright notice and this permission notice appear in all copies, and that
38 * the name of Digital Equipment Corporation not be used in advertising or
39 * publicity pertaining to distribution of the document or software without
40 * specific, written prior permission.
41 *
42 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
43 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
44 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
45 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
46 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
47 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
48 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
49 * SOFTWARE.
50 * -
51 * --Copyright--
52 */
53
54#if defined(LIBC_SCCS) && !defined(lint)
55#if 0
56static char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93";
57static char rcsid[] = "$From: res_mkquery.c,v 8.5 1996/08/27 08:33:28 vixie Exp $";
58#else
59static char rcsid[] = "$OpenBSD: res_mkquery.c,v 1.16 2005/03/30 02:58:28 tedu Exp $";
60#endif
61#endif /* LIBC_SCCS and not lint */
62
63#include <sys/types.h>
64#include <sys/param.h>
65#include <netinet/in.h>
66#include <arpa/nameser.h>
67
68#include <stdio.h>
69#include <netdb.h>
70#include <resolv.h>
71#include <string.h>
72
73#include "thread_private.h"
74
75/*
76 * Form all types of queries.
77 * Returns the size of the result or -1.
78 */
79/* ARGSUSED */
80int
81res_mkquery(int op,
82 const char *dname, /* opcode of query */
83 int class, /* domain name */
84 int type, /* class and type of query */
85 const u_char *data, /* resource record data */
86 int datalen, /* length of data */
87 const u_char *newrr_in, /* new rr for modify or append */
88 u_char *buf, /* buffer to put query */
89 int buflen) /* size of buffer */
90{
91 struct __res_state *_resp = _THREAD_PRIVATE(_res, _res, &_res);
92 HEADER *hp;
93 u_char *cp, *ep;
94 int n;
95 u_char *dnptrs[20], **dpp, **lastdnptr;
96
97 if (_res_init(0) == -1) {
98 h_errno = NETDB_INTERNAL;
99 return (-1);
100 }
101#ifdef DEBUG
102 if (_resp->options & RES_DEBUG)
103 printf(";; res_mkquery(%d, %s, %d, %d)\n",
104 op, dname, class, type);
105#endif
106 /*
107 * Initialize header fields.
108 *
109 * A special random number generator is used to create non predictable
110 * and non repeating ids over a long period. It also avoids reuse
111 * by switching between two distinct number cycles.
112 */
113
114 if ((buf == NULL) || (buflen < HFIXEDSZ))
115 return (-1);
116 bzero(buf, HFIXEDSZ);
117 hp = (HEADER *) buf;
118 _resp->id = res_randomid();
119 hp->id = htons(_resp->id);
120 hp->opcode = op;
121 hp->rd = (_resp->options & RES_RECURSE) != 0;
122 hp->rcode = NOERROR;
123 cp = buf + HFIXEDSZ;
124 ep = buf + buflen;
125 dpp = dnptrs;
126 *dpp++ = buf;
127 *dpp++ = NULL;
128 lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
129 /*
130 * perform opcode specific processing
131 */
132 switch (op) {
133 case QUERY: /*FALLTHROUGH*/
134 case NS_NOTIFY_OP:
135 if (ep - cp < QFIXEDSZ)
136 return (-1);
137 if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs,
138 lastdnptr)) < 0)
139 return (-1);
140 cp += n;
141 __putshort(type, cp);
142 cp += INT16SZ;
143 __putshort(class, cp);
144 cp += INT16SZ;
145 hp->qdcount = htons(1);
146 if (op == QUERY || data == NULL)
147 break;
148 /*
149 * Make an additional record for completion domain.
150 */
151 if (ep - cp < RRFIXEDSZ)
152 return (-1);
153 n = dn_comp((char *)data, cp, ep - cp - RRFIXEDSZ, dnptrs,
154 lastdnptr);
155 if (n < 0)
156 return (-1);
157 cp += n;
158 __putshort(T_NULL, cp);
159 cp += INT16SZ;
160 __putshort(class, cp);
161 cp += INT16SZ;
162 __putlong(0, cp);
163 cp += INT32SZ;
164 __putshort(0, cp);
165 cp += INT16SZ;
166 hp->arcount = htons(1);
167 break;
168
169 case IQUERY:
170 /*
171 * Initialize answer section
172 */
173 if (ep - cp < 1 + RRFIXEDSZ + datalen)
174 return (-1);
175 *cp++ = '\0'; /* no domain name */
176 __putshort(type, cp);
177 cp += INT16SZ;
178 __putshort(class, cp);
179 cp += INT16SZ;
180 __putlong(0, cp);
181 cp += INT32SZ;
182 __putshort(datalen, cp);
183 cp += INT16SZ;
184 if (datalen) {
185 bcopy(data, cp, datalen);
186 cp += datalen;
187 }
188 hp->ancount = htons(1);
189 break;
190
191 default:
192 return (-1);
193 }
194 return (cp - buf);
195}
196
197/* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */
198int
199res_opt(int n0,
200 u_char *buf, /* buffer to put query */
201 int buflen, /* size of buffer */
202 int anslen) /* answer buffer length */
203{
204 struct __res_state *_resp = _THREAD_PRIVATE(_res, _res, &_res);
205 HEADER *hp;
206 u_char *cp, *ep;
207
208 hp = (HEADER *) buf;
209 cp = buf + n0;
210 ep = buf + buflen;
211
212 if (ep - cp < 1 + RRFIXEDSZ)
213 return -1;
214
215 *cp++ = 0; /* "." */
216
217 __putshort(T_OPT, cp); /* TYPE */
218 cp += INT16SZ;
219 if (anslen > 0xffff)
220 anslen = 0xffff; /* limit to 16bit value */
221 __putshort(anslen & 0xffff, cp); /* CLASS = UDP payload size */
222 cp += INT16SZ;
223 *cp++ = NOERROR; /* extended RCODE */
224 *cp++ = 0; /* EDNS version */
225 if (_resp->options & RES_USE_DNSSEC) {
226#ifdef DEBUG
227 if (_resp->options & RES_DEBUG)
228 printf(";; res_opt()... ENDS0 DNSSEC OK\n");
229#endif /* DEBUG */
230 __putshort(DNS_MESSAGEEXTFLAG_DO, cp); /* EDNS Z field */
231 cp += INT16SZ;
232 } else {
233 __putshort(0, cp); /* EDNS Z field */
234 cp += INT16SZ;
235 }
236 __putshort(0, cp); /* RDLEN */
237 cp += INT16SZ;
238 hp->arcount = htons(ntohs(hp->arcount) + 1);
239
240 return cp - buf;
241}
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