1/*
2 * Copyright (c) 1985, 1993
3 *    The Regents of the University of California.  All rights reserved.
4 *
5 * Portions copyright (c) 1999, 2000
6 * Intel Corporation.
7 * 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 *
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this software
21 *    must display the following acknowledgement:
22 *
23 *    This product includes software developed by the University of
24 *    California, Berkeley, Intel Corporation, and its contributors.
25 *
26 * 4. Neither the name of University, Intel Corporation, or their respective
27 *    contributors may be used to endorse or promote products derived from
28 *    this software without specific prior written permission.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS, INTEL CORPORATION AND
31 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
32 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
33 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS,
34 * INTEL CORPORATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
35 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
40 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
41 *
42 */
43
44/*
45 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
46 *
47 * Permission to use, copy, modify, and distribute this software for any
48 * purpose with or without fee is hereby granted, provided that the above
49 * copyright notice and this permission notice appear in all copies, and that
50 * the name of Digital Equipment Corporation not be used in advertising or
51 * publicity pertaining to distribution of the document or software without
52 * specific, written prior permission.
53 *
54 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
55 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
56 * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
57 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
58 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
59 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
60 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
61 * SOFTWARE.
62 */
63
64/*
65 * Portions Copyright (c) 1996 by Internet Software Consortium.
66 *
67 * Permission to use, copy, modify, and distribute this software for any
68 * purpose with or without fee is hereby granted, provided that the above
69 * copyright notice and this permission notice appear in all copies.
70 *
71 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
72 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
73 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
74 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
75 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
76 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
77 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
78 * SOFTWARE.
79 */
80
81#if defined(LIBC_SCCS) && !defined(lint)
82static char sccsid[] = "@(#)res_mkquery.c   8.1 (Berkeley) 6/4/93";
83static char orig_rcsid[] = "From: Id: res_mkquery.c,v 8.9 1997/04/24 22:22:36 vixie Exp $";
84static char rcsid[] = "$Id: res_mkquery.c,v 1.1.1.1 2003/11/19 01:51:37 kyu3 Exp $";
85#endif /* LIBC_SCCS and not lint */
86
87#include <sys/types.h>
88#include <sys/param.h>
89#include <netinet/in.h>
90#include <arpa/nameser.h>
91#include <netdb.h>
92#include <resolv.h>
93#include <stdio.h>
94#include <string.h>
95
96#include "res_config.h"
97
98/*
99 * Form all types of queries.
100 * Returns the size of the result or -1.
101 */
102int
103res_mkquery(
104    int op,         /* opcode of query */
105    const char *dname,  /* domain name */
106    int class,          /* class of query */
107    int type,           /* type of query */
108    const u_char *data, /* resource record data */
109    int datalen,        /* length of data */
110    const u_char *newrr_in, /* new rr for modify or append */
111    u_char *buf,        /* buffer to put query */
112    int buflen     /* size of buffer */
113    )
114{
115    register HEADER *hp;
116    register u_char *cp;
117    register int n;
118    u_char *dnptrs[20], **dpp, **lastdnptr;
119
120    if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
121        h_errno = NETDB_INTERNAL;
122        return (-1);
123    }
124#ifdef DEBUG
125    if (_res.options & RES_DEBUG)
126        printf(";; res_mkquery(%d, %s, %d, %d)\n",
127               op, dname, class, type);
128#endif
129    /*
130     * Initialize header fields.
131     */
132    if ((buf == NULL) || (buflen < HFIXEDSZ))
133        return (-1);
134    memset(buf, 0, HFIXEDSZ);
135    hp = (HEADER *) buf;
136    hp->id = htons(++_res.id);
137    hp->opcode = op;
138    hp->rd = (_res.options & RES_RECURSE) != 0;
139    hp->rcode = NOERROR;
140    cp = buf + HFIXEDSZ;
141    buflen -= HFIXEDSZ;
142    dpp = dnptrs;
143    *dpp++ = buf;
144    *dpp++ = NULL;
145    lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
146    /*
147     * perform opcode specific processing
148     */
149    switch (op) {
150    case QUERY: /*FALLTHROUGH*/
151    case NS_NOTIFY_OP:
152        if ((buflen -= QFIXEDSZ) < 0)
153            return (-1);
154        if ((n = dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0)
155            return (-1);
156        cp += n;
157        buflen -= n;
158        __putshort((u_int16_t)type, cp);
159        cp += INT16SZ;
160        __putshort((u_int16_t)class, cp);
161        cp += INT16SZ;
162        hp->qdcount = htons(1);
163        if (op == QUERY || data == NULL)
164            break;
165        /*
166         * Make an additional record for completion domain.
167         */
168        buflen -= RRFIXEDSZ;
169        n = dn_comp((char *)data, cp, buflen, dnptrs, lastdnptr);
170        if (n < 0)
171            return (-1);
172        cp += n;
173        buflen -= n;
174        __putshort(T_NULL, cp);
175        cp += INT16SZ;
176        __putshort((u_int16_t)class, cp);
177        cp += INT16SZ;
178        __putlong(0, cp);
179        cp += INT32SZ;
180        __putshort(0, cp);
181        cp += INT16SZ;
182        hp->arcount = htons(1);
183        break;
184
185    case IQUERY:
186        /*
187         * Initialize answer section
188         */
189        if (buflen < 1 + RRFIXEDSZ + datalen)
190            return (-1);
191        *cp++ = '\0';   /* no domain name */
192        __putshort((u_int16_t)type, cp);
193        cp += INT16SZ;
194        __putshort((u_int16_t)class, cp);
195        cp += INT16SZ;
196        __putlong(0, cp);
197        cp += INT32SZ;
198        __putshort((u_int16_t)datalen, cp);
199        cp += INT16SZ;
200        if (datalen) {
201            memcpy(cp, data, datalen);
202            cp += datalen;
203        }
204        hp->ancount = htons(1);
205        break;
206
207    default:
208        return (-1);
209    }
210    return ((int)(cp - buf));
211}
212