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-rw-r--r--src/lib/libc/net/res_mkquery.c242
1 files changed, 242 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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+++ b/src/lib/libc/net/res_mkquery.c
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1/* $OpenBSD: res_mkquery.c,v 1.12 2002/08/28 03:19:38 itojun 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. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 * -
37 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
38 *
39 * Permission to use, copy, modify, and distribute this software for any
40 * purpose with or without fee is hereby granted, provided that the above
41 * copyright notice and this permission notice appear in all copies, and that
42 * the name of Digital Equipment Corporation not be used in advertising or
43 * publicity pertaining to distribution of the document or software without
44 * specific, written prior permission.
45 *
46 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
47 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
48 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
49 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
50 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
51 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
52 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
53 * SOFTWARE.
54 * -
55 * --Copyright--
56 */
57
58#if defined(LIBC_SCCS) && !defined(lint)
59#if 0
60static char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93";
61static char rcsid[] = "$From: res_mkquery.c,v 8.5 1996/08/27 08:33:28 vixie Exp $";
62#else
63static char rcsid[] = "$OpenBSD: res_mkquery.c,v 1.12 2002/08/28 03:19:38 itojun Exp $";
64#endif
65#endif /* LIBC_SCCS and not lint */
66
67#include <sys/types.h>
68#include <sys/param.h>
69#include <netinet/in.h>
70#include <arpa/nameser.h>
71
72#include <stdio.h>
73#include <netdb.h>
74#include <resolv.h>
75#include <string.h>
76
77/*
78 * Form all types of queries.
79 * Returns the size of the result or -1.
80 */
81/* ARGSUSED */
82int
83res_mkquery(op, dname, class, type, data, datalen, newrr_in, buf, buflen)
84 int op; /* opcode of query */
85 const char *dname; /* domain name */
86 int class, type; /* class and type of query */
87 const u_char *data; /* resource record data */
88 int datalen; /* length of data */
89 const u_char *newrr_in; /* new rr for modify or append */
90 u_char *buf; /* buffer to put query */
91 int buflen; /* size of buffer */
92{
93 register HEADER *hp;
94 register u_char *cp, *ep;
95 register int n;
96 u_char *dnptrs[20], **dpp, **lastdnptr;
97
98 if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
99 h_errno = NETDB_INTERNAL;
100 return (-1);
101 }
102#ifdef DEBUG
103 if (_res.options & RES_DEBUG)
104 printf(";; res_mkquery(%d, %s, %d, %d)\n",
105 op, dname, class, type);
106#endif
107 /*
108 * Initialize header fields.
109 *
110 * A special random number generator is used to create non predictable
111 * and non repeating ids over a long period. It also avoids reuse
112 * by switching between two distinct number cycles.
113 */
114
115 if ((buf == NULL) || (buflen < HFIXEDSZ))
116 return (-1);
117 bzero(buf, HFIXEDSZ);
118 hp = (HEADER *) buf;
119 _res.id = res_randomid();
120 hp->id = htons(_res.id);
121 hp->opcode = op;
122 hp->rd = (_res.options & RES_RECURSE) != 0;
123 hp->rcode = NOERROR;
124 cp = buf + HFIXEDSZ;
125 ep = buf + buflen;
126 dpp = dnptrs;
127 *dpp++ = buf;
128 *dpp++ = NULL;
129 lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
130 /*
131 * perform opcode specific processing
132 */
133 switch (op) {
134 case QUERY: /*FALLTHROUGH*/
135 case NS_NOTIFY_OP:
136 if (ep - cp < QFIXEDSZ)
137 return (-1);
138 if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs,
139 lastdnptr)) < 0)
140 return (-1);
141 cp += n;
142 __putshort(type, cp);
143 cp += INT16SZ;
144 __putshort(class, cp);
145 cp += INT16SZ;
146 hp->qdcount = htons(1);
147 if (op == QUERY || data == NULL)
148 break;
149 /*
150 * Make an additional record for completion domain.
151 */
152 if (ep - cp < RRFIXEDSZ)
153 return (-1);
154 n = dn_comp((char *)data, cp, ep - cp - RRFIXEDSZ, dnptrs,
155 lastdnptr);
156 if (n < 0)
157 return (-1);
158 cp += n;
159 __putshort(T_NULL, cp);
160 cp += INT16SZ;
161 __putshort(class, cp);
162 cp += INT16SZ;
163 __putlong(0, cp);
164 cp += INT32SZ;
165 __putshort(0, cp);
166 cp += INT16SZ;
167 hp->arcount = htons(1);
168 break;
169
170 case IQUERY:
171 /*
172 * Initialize answer section
173 */
174 if (ep - cp < 1 + RRFIXEDSZ + datalen)
175 return (-1);
176 *cp++ = '\0'; /* no domain name */
177 __putshort(type, cp);
178 cp += INT16SZ;
179 __putshort(class, cp);
180 cp += INT16SZ;
181 __putlong(0, cp);
182 cp += INT32SZ;
183 __putshort(datalen, cp);
184 cp += INT16SZ;
185 if (datalen) {
186 bcopy(data, cp, datalen);
187 cp += datalen;
188 }
189 hp->ancount = htons(1);
190 break;
191
192 default:
193 return (-1);
194 }
195 return (cp - buf);
196}
197
198/* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */
199int
200res_opt(n0, buf, buflen, anslen)
201 int n0;
202 u_char *buf; /* buffer to put query */
203 int buflen; /* size of buffer */
204 int anslen; /* answer buffer length */
205{
206 register HEADER *hp;
207 register u_char *cp, *ep;
208
209 hp = (HEADER *) buf;
210 cp = buf + n0;
211 ep = buf + buflen;
212
213 if (ep - cp < 1 + RRFIXEDSZ)
214 return -1;
215
216 *cp++ = 0; /* "." */
217
218 __putshort(T_OPT, cp); /* TYPE */
219 cp += INT16SZ;
220 if (anslen > 0xffff)
221 anslen = 0xffff; /* limit to 16bit value */
222 __putshort(anslen & 0xffff, cp); /* CLASS = UDP payload size */
223 cp += INT16SZ;
224 *cp++ = NOERROR; /* extended RCODE */
225 *cp++ = 0; /* EDNS version */
226 if (_res.options & RES_USE_DNSSEC) {
227#ifdef DEBUG
228 if (_res.options & RES_DEBUG)
229 printf(";; res_opt()... ENDS0 DNSSEC OK\n");
230#endif /* DEBUG */
231 __putshort(DNS_MESSAGEEXTFLAG_DO, cp); /* EDNS Z field */
232 cp += INT16SZ;
233 } else {
234 __putshort(0, cp); /* EDNS Z field */
235 cp += INT16SZ;
236 }
237 __putshort(0, cp); /* RDLEN */
238 cp += INT16SZ;
239 hp->arcount = htons(ntohs(hp->arcount) + 1);
240
241 return cp - buf;
242}
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