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[glibc.git] / resolv / res_mkquery.c
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1 /*
2 * ++Copyright++ 1985, 1993
3 * -
4 * Copyright (c) 1985, 1993
5 * The Regents of the University of California. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the University of
18 * California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 * -
35 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
37 * Permission to use, copy, modify, and distribute this software for any
38 * purpose with or without fee is hereby granted, provided that the above
39 * copyright notice and this permission notice appear in all copies, and that
40 * the name of Digital Equipment Corporation not be used in advertising or
41 * publicity pertaining to distribution of the document or software without
42 * specific, written prior permission.
44 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
45 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
46 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
47 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
48 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
49 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
50 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
51 * SOFTWARE.
52 * -
53 * --Copyright--
56 #if defined(LIBC_SCCS) && !defined(lint)
57 static char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93";
58 static char rcsid[] = "$Id$";
59 #endif /* LIBC_SCCS and not lint */
61 #include <sys/types.h>
62 #include <sys/param.h>
63 #include <netinet/in.h>
64 #include <arpa/nameser.h>
66 #include <stdio.h>
67 #include <netdb.h>
68 #include <resolv.h>
69 #if defined(BSD) && (BSD >= 199103)
70 # include <string.h>
71 #else
72 # include "../conf/portability.h"
73 #endif
75 #if defined(USE_OPTIONS_H)
76 # include <../conf/options.h>
77 #endif
80 * Form all types of queries.
81 * Returns the size of the result or -1.
83 int
84 res_mkquery(op, dname, class, type, data, datalen, newrr_in, buf, buflen)
85 int op; /* opcode of query */
86 const char *dname; /* domain name */
87 int class, type; /* class and type of query */
88 const u_char *data; /* resource record data */
89 int datalen; /* length of data */
90 const u_char *newrr_in; /* new rr for modify or append */
91 u_char *buf; /* buffer to put query */
92 int buflen; /* size of buffer */
94 register HEADER *hp;
95 register u_char *cp;
96 register int n;
97 u_char *dnptrs[20], **dpp, **lastdnptr;
99 if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
100 __set_h_errno (NETDB_INTERNAL);
101 return (-1);
103 #ifdef DEBUG
104 if (_res.options & RES_DEBUG)
105 printf(";; res_mkquery(%d, %s, %d, %d)\n",
106 op, dname, class, type);
107 #endif
109 * Initialize header fields.
111 if ((buf == NULL) || (buflen < HFIXEDSZ))
112 return (-1);
113 bzero(buf, HFIXEDSZ);
114 hp = (HEADER *) buf;
115 hp->id = htons(++_res.id);
116 hp->opcode = op;
117 hp->rd = (_res.options & RES_RECURSE) != 0;
118 hp->rcode = NOERROR;
119 cp = buf + HFIXEDSZ;
120 buflen -= HFIXEDSZ;
121 dpp = dnptrs;
122 *dpp++ = buf;
123 *dpp++ = NULL;
124 lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
126 * perform opcode specific processing
128 switch (op) {
129 case QUERY: /*FALLTHROUGH*/
130 case NS_NOTIFY_OP:
131 if ((buflen -= QFIXEDSZ) < 0)
132 return (-1);
133 if ((n = dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0)
134 return (-1);
135 cp += n;
136 buflen -= n;
137 __putshort(type, cp);
138 cp += INT16SZ;
139 __putshort(class, cp);
140 cp += INT16SZ;
141 hp->qdcount = htons(1);
142 if (op == QUERY || data == NULL)
143 break;
145 * Make an additional record for completion domain.
147 buflen -= RRFIXEDSZ;
148 n = dn_comp((char *)data, cp, buflen, dnptrs, lastdnptr);
149 if (n < 0)
150 return (-1);
151 cp += n;
152 buflen -= n;
153 __putshort(T_NULL, cp);
154 cp += INT16SZ;
155 __putshort(class, cp);
156 cp += INT16SZ;
157 __putlong(0, cp);
158 cp += INT32SZ;
159 __putshort(0, cp);
160 cp += INT16SZ;
161 hp->arcount = htons(1);
162 break;
164 case IQUERY:
166 * Initialize answer section
168 if (buflen < 1 + RRFIXEDSZ + datalen)
169 return (-1);
170 *cp++ = '\0'; /* no domain name */
171 __putshort(type, cp);
172 cp += INT16SZ;
173 __putshort(class, cp);
174 cp += INT16SZ;
175 __putlong(0, cp);
176 cp += INT32SZ;
177 __putshort(datalen, cp);
178 cp += INT16SZ;
179 if (datalen) {
180 bcopy(data, cp, datalen);
181 cp += datalen;
183 hp->ancount = htons(1);
184 break;
186 default:
187 return (-1);
189 return (cp - buf);