2 * Copyright (c) 1985, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. 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.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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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
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
55 * Portions Copyright (c) 1996 by Internet Software Consortium.
57 * Permission to use, copy, modify, and distribute this software for any
58 * purpose with or without fee is hereby granted, provided that the above
59 * copyright notice and this permission notice appear in all copies.
61 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
62 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
63 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
64 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
65 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
66 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
67 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
71 #if defined(LIBC_SCCS) && !defined(lint)
72 static char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93";
73 static char orig_rcsid[] = "From: Id: res_mkquery.c,v 8.9 1997/04/24 22:22:36 vixie Exp $";
74 #endif /* LIBC_SCCS and not lint */
75 #include <sys/cdefs.h>
76 __FBSDID("$FreeBSD$");
78 #include <sys/types.h>
79 #include <sys/param.h>
80 #include <netinet/in.h>
81 #include <arpa/nameser.h>
87 #include "res_config.h"
90 * Form all types of queries.
91 * Returns the size of the result or -1.
94 res_mkquery(op, dname, class, type, data, datalen, newrr_in, buf, buflen)
95 int op; /* opcode of query */
96 const char *dname; /* domain name */
97 int class, type; /* class and type of query */
98 const u_char *data; /* resource record data */
99 int datalen; /* length of data */
100 const u_char *newrr_in; /* new rr for modify or append */
101 u_char *buf; /* buffer to put query */
102 int buflen; /* size of buffer */
107 u_char *dnptrs[20], **dpp, **lastdnptr;
109 if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
110 h_errno = NETDB_INTERNAL;
114 if (_res.options & RES_DEBUG)
115 printf(";; res_mkquery(%d, %s, %d, %d)\n",
116 op, dname, class, type);
119 * Initialize header fields.
121 if ((buf == NULL) || (buflen < HFIXEDSZ))
123 memset(buf, 0, HFIXEDSZ);
125 hp->id = htons(++_res.id);
127 hp->rd = (_res.options & RES_RECURSE) != 0;
134 lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
136 * perform opcode specific processing
139 case QUERY: /*FALLTHROUGH*/
141 if ((buflen -= QFIXEDSZ) < 0)
143 if ((n = dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0)
147 __putshort(type, cp);
149 __putshort(class, cp);
151 hp->qdcount = htons(1);
152 if (op == QUERY || data == NULL)
155 * Make an additional record for completion domain.
158 n = dn_comp((char *)data, cp, buflen, dnptrs, lastdnptr);
163 __putshort(T_NULL, cp);
165 __putshort(class, cp);
171 hp->arcount = htons(1);
176 * Initialize answer section
178 if (buflen < 1 + RRFIXEDSZ + datalen)
180 *cp++ = '\0'; /* no domain name */
181 __putshort(type, cp);
183 __putshort(class, cp);
187 __putshort(datalen, cp);
190 memcpy(cp, data, datalen);
193 hp->ancount = htons(1);
203 * Weak aliases for applications that use certain private entry points,
204 * and fail to include <resolv.h>.
207 __weak_reference(__res_mkquery, res_mkquery);
209 /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */
211 res_opt(n0, buf, buflen, anslen)
213 u_char *buf; /* buffer to put query */
214 int buflen; /* size of buffer */
215 int anslen; /* answer buffer length */
224 if (buflen < 1 + RRFIXEDSZ)
230 __putshort(T_OPT, cp); /* TYPE */
233 anslen = 0xffff; /* limit to 16bit value */
234 __putshort(anslen & 0xffff, cp); /* CLASS = UDP payload size */
236 *cp++ = NOERROR; /* extended RCODE */
237 *cp++ = 0; /* EDNS version */
238 __putshort(0, cp); /* MBZ */
240 __putshort(0, cp); /* RDLEN */
242 hp->arcount = htons(ntohs(hp->arcount) + 1);