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
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14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
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31 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
33 * Permission to use, copy, modify, and distribute this software for any
34 * purpose with or without fee is hereby granted, provided that the above
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36 * the name of Digital Equipment Corporation not be used in advertising or
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46 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
51 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
52 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
54 * Permission to use, copy, modify, and distribute this software for any
55 * purpose with or without fee is hereby granted, provided that the above
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58 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
59 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
60 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
61 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
62 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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64 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
67 #if defined(LIBC_SCCS) && !defined(lint)
68 static const char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93";
69 static const char rcsid[] = "$Id: res_mkquery.c,v 1.5.18.2 2008/04/03 23:15:15 marka Exp $";
70 #endif /* LIBC_SCCS and not lint */
71 #include <sys/cdefs.h>
72 __FBSDID("$FreeBSD$");
74 #include "port_before.h"
75 #include <sys/types.h>
76 #include <sys/param.h>
77 #include <netinet/in.h>
78 #include <arpa/nameser.h>
83 #include "port_after.h"
85 /* Options. Leave them on. */
88 extern const char *_res_opcodes[];
91 * Form all types of queries.
92 * Returns the size of the result or -1.
95 res_nmkquery(res_state statp,
96 int op, /*!< opcode of query */
97 const char *dname, /*!< domain name */
98 int class, int type, /*!< class and type of query */
99 const u_char *data, /*!< resource record data */
100 int datalen, /*!< length of data */
101 const u_char *newrr_in, /*!< new rr for modify or append */
102 u_char *buf, /*!< buffer to put query */
103 int buflen) /*!< size of buffer */
108 u_char *dnptrs[20], **dpp, **lastdnptr;
113 if (statp->options & RES_DEBUG)
114 printf(";; res_nmkquery(%s, %s, %s, %s)\n",
115 _res_opcodes[op], dname, p_class(class), p_type(type));
118 * Initialize header fields.
120 if ((buf == NULL) || (buflen < HFIXEDSZ))
122 memset(buf, 0, HFIXEDSZ);
124 hp->id = htons(++statp->id);
126 hp->rd = (statp->options & RES_RECURSE) != 0U;
133 lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
135 * perform opcode specific processing
138 case QUERY: /*FALLTHROUGH*/
140 if (ep - cp < QFIXEDSZ)
142 if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs,
150 hp->qdcount = htons(1);
151 if (op == QUERY || data == NULL)
154 * Make an additional record for completion domain.
156 if ((ep - cp) < RRFIXEDSZ)
158 n = dn_comp((const char *)data, cp, ep - cp - RRFIXEDSZ,
163 ns_put16(T_NULL, cp);
171 hp->arcount = htons(1);
176 * Initialize answer section
178 if (ep - cp < 1 + RRFIXEDSZ + datalen)
180 *cp++ = '\0'; /*%< no domain name */
187 ns_put16(datalen, cp);
190 memcpy(cp, data, datalen);
193 hp->ancount = htons(1);
203 /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */
206 res_nopt(res_state statp,
207 int n0, /*%< current offset in buffer */
208 u_char *buf, /*%< buffer to put query */
209 int buflen, /*%< size of buffer */
210 int anslen) /*%< UDP answer buffer size */
217 if ((statp->options & RES_DEBUG) != 0U)
218 printf(";; res_nopt()\n");
225 if ((ep - cp) < 1 + RRFIXEDSZ)
228 *cp++ = 0; /*%< "." */
229 ns_put16(ns_t_opt, cp); /*%< TYPE */
232 anslen = 0xffff; /* limit to 16bit value */
233 ns_put16(anslen & 0xffff, cp); /*%< CLASS = UDP payload size */
235 *cp++ = NOERROR; /*%< extended RCODE */
236 *cp++ = 0; /*%< EDNS version */
238 if (statp->options & RES_USE_DNSSEC) {
240 if (statp->options & RES_DEBUG)
241 printf(";; res_opt()... ENDS0 DNSSEC\n");
243 flags |= NS_OPT_DNSSEC_OK;
248 ns_put16(0U, cp); /*%< RDLEN */
251 hp->arcount = htons(ntohs(hp->arcount) + 1);
257 * Construct variable data (RDATA) block for OPT psuedo-RR, append it
258 * to the buffer, then update the RDLEN field (previously set to zero by
259 * res_nopt()) with the new RDATA length.
262 res_nopt_rdata(res_state statp,
263 int n0, /*%< current offset in buffer */
264 u_char *buf, /*%< buffer to put query */
265 int buflen, /*%< size of buffer */
266 u_char *rdata, /*%< ptr to start of opt rdata */
267 u_short code, /*%< OPTION-CODE */
268 u_short len, /*%< OPTION-LENGTH */
269 u_char *data) /*%< OPTION_DATA */
271 register u_char *cp, *ep;
274 if ((statp->options & RES_DEBUG) != 0U)
275 printf(";; res_nopt_rdata()\n");
281 if ((ep - cp) < (4 + len))
284 if (rdata < (buf + 2) || rdata >= ep)
293 memcpy(cp, data, len);
297 ns_put16(len, rdata - 2); /* Update RDLEN field */