2 * Copyright (c) 1985, 1993
3 * The Regents of the University of California. All rights reserved.
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6 * modification, are permitted provided that the following conditions
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15 * This product includes software developed by the University of
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35 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
37 * Permission to use, copy, modify, and distribute this software for any
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40 * the name of Digital Equipment Corporation not be used in advertising or
41 * publicity pertaining to distribution of the document or software without
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44 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
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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
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61 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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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 $";
74 static char rcsid[] = "$FreeBSD: src/lib/libc/net/res_mkquery.c,v 1.15.2.2 2002/09/20 10:45:35 nectar Exp $";
75 #endif /* LIBC_SCCS and not lint */
77 #include <sys/types.h>
78 #include <sys/param.h>
79 #include <netinet/in.h>
80 #include <arpa/nameser.h>
86 #include "res_config.h"
89 * Form all types of queries.
90 * Returns the size of the result or -1.
93 res_mkquery(op, dname, class, type, data, datalen, newrr_in, buf, buflen)
94 int op; /* opcode of query */
95 const char *dname; /* domain name */
96 int class, type; /* class and type of query */
97 const u_char *data; /* resource record data */
98 int datalen; /* length of data */
99 const u_char *newrr_in; /* new rr for modify or append */
100 u_char *buf; /* buffer to put query */
101 int buflen; /* size of buffer */
106 u_char *dnptrs[20], **dpp, **lastdnptr;
108 if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
109 h_errno = NETDB_INTERNAL;
113 if (_res.options & RES_DEBUG)
114 printf(";; res_mkquery(%d, %s, %d, %d)\n",
115 op, dname, class, type);
118 * Initialize header fields.
120 if ((buf == NULL) || (buflen < HFIXEDSZ))
122 memset(buf, 0, HFIXEDSZ);
124 hp->id = htons(++_res.id);
126 hp->rd = (_res.options & RES_RECURSE) != 0;
133 lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
135 * perform opcode specific processing
138 case QUERY: /*FALLTHROUGH*/
140 if ((buflen -= QFIXEDSZ) < 0)
142 if ((n = dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0)
146 __putshort(type, cp);
148 __putshort(class, cp);
150 hp->qdcount = htons(1);
151 if (op == QUERY || data == NULL)
154 * Make an additional record for completion domain.
157 n = dn_comp((char *)data, cp, buflen, dnptrs, lastdnptr);
162 __putshort(T_NULL, cp);
164 __putshort(class, cp);
170 hp->arcount = htons(1);
175 * Initialize answer section
177 if (buflen < 1 + RRFIXEDSZ + datalen)
179 *cp++ = '\0'; /* no domain name */
180 __putshort(type, cp);
182 __putshort(class, cp);
186 __putshort(datalen, cp);
189 memcpy(cp, data, datalen);
192 hp->ancount = htons(1);
202 * Weak aliases for applications that use certain private entry points,
203 * and fail to include <resolv.h>.
206 __weak_reference(__res_mkquery, res_mkquery);
208 /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */
210 res_opt(n0, buf, buflen, anslen)
212 u_char *buf; /* buffer to put query */
213 int buflen; /* size of buffer */
214 int anslen; /* answer buffer length */
223 if (buflen < 1 + RRFIXEDSZ)
229 __putshort(T_OPT, cp); /* TYPE */
232 anslen = 0xffff; /* limit to 16bit value */
233 __putshort(anslen & 0xffff, cp); /* CLASS = UDP payload size */
235 *cp++ = NOERROR; /* extended RCODE */
236 *cp++ = 0; /* EDNS version */
237 __putshort(0, cp); /* MBZ */
239 __putshort(0, cp); /* RDLEN */
241 hp->arcount = htons(ntohs(hp->arcount) + 1);