1/* 2 * Portions Copyright (C) 2004, 2005, 2008 Internet Systems Consortium, Inc. ("ISC") 3 * Portions Copyright (C) 1996, 1997, 1988, 1999, 2001, 2003 Internet Software Consortium. 4 * 5 * Permission to use, copy, modify, and/or distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH 10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 11 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, 12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE 14 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 15 * PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18/* 19 * Copyright (c) 1985, 1993 20 * The Regents of the University of California. All rights reserved. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the above copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 4. Neither the name of the University nor the names of its contributors 31 * may be used to endorse or promote products derived from this software 32 * without specific prior written permission. 33 * 34 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 35 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 36 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 37 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 38 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 39 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 40 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 41 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 42 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 43 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 44 * SUCH DAMAGE. 45 */ 46 47/* 48 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 49 * 50 * Permission to use, copy, modify, and distribute this software for any 51 * purpose with or without fee is hereby granted, provided that the above 52 * copyright notice and this permission notice appear in all copies, and that 53 * the name of Digital Equipment Corporation not be used in advertising or 54 * publicity pertaining to distribution of the document or software without 55 * specific, written prior permission. 56 * 57 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 58 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 59 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 60 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 61 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 62 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 63 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 64 * SOFTWARE. 65 */ 66 67#if defined(LIBC_SCCS) && !defined(lint) 68static const char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93"; 69static const char rcsid[] = "$Id: res_mkquery.c,v 1.10 2008/12/11 09:59:00 marka Exp $"; 70#endif /* LIBC_SCCS and not lint */ 71#include <sys/cdefs.h> 72__FBSDID("$FreeBSD$"); 73 74#include "port_before.h" 75#include <sys/param.h> 76#include <netinet/in.h> 77#include <arpa/nameser.h> 78#include <netdb.h> 79#include <resolv.h> 80#include <stdio.h> 81#include <string.h> 82#include "port_after.h" 83 84/* Options. Leave them on. */ 85#ifndef DEBUG 86#define DEBUG 87#endif 88 89extern const char *_res_opcodes[]; 90 91/*% 92 * Form all types of queries. 93 * Returns the size of the result or -1. 94 */ 95int 96res_nmkquery(res_state statp, 97 int op, /*!< opcode of query */ 98 const char *dname, /*!< domain name */ 99 int class, int type, /*!< class and type of query */ 100 const u_char *data, /*!< resource record data */ 101 int datalen, /*!< length of data */ 102 const u_char *newrr_in, /*!< new rr for modify or append */ 103 u_char *buf, /*!< buffer to put query */ 104 int buflen) /*!< size of buffer */ 105{ 106 HEADER *hp; 107 u_char *cp, *ep; 108 int n; 109 u_char *dnptrs[20], **dpp, **lastdnptr; 110 111 UNUSED(newrr_in); 112 113#ifdef DEBUG 114 if (statp->options & RES_DEBUG) 115 printf(";; res_nmkquery(%s, %s, %s, %s)\n", 116 _res_opcodes[op], dname, p_class(class), p_type(type)); 117#endif 118 /* 119 * Initialize header fields. 120 */ 121 if ((buf == NULL) || (buflen < HFIXEDSZ)) 122 return (-1); 123 memset(buf, 0, HFIXEDSZ); 124 hp = (HEADER *) buf; 125 statp->id = res_nrandomid(statp); 126 hp->id = htons(statp->id); 127 hp->opcode = op; 128 hp->rd = (statp->options & RES_RECURSE) != 0U; 129 hp->rcode = NOERROR; 130 cp = buf + HFIXEDSZ; 131 ep = buf + buflen; 132 dpp = dnptrs; 133 *dpp++ = buf; 134 *dpp++ = NULL; 135 lastdnptr = dnptrs + nitems(dnptrs); 136 /* 137 * perform opcode specific processing 138 */ 139 switch (op) { 140 case QUERY: /*FALLTHROUGH*/ 141 case NS_NOTIFY_OP: 142 if (ep - cp < QFIXEDSZ) 143 return (-1); 144 if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs, 145 lastdnptr)) < 0) 146 return (-1); 147 cp += n; 148 ns_put16(type, cp); 149 cp += INT16SZ; 150 ns_put16(class, cp); 151 cp += INT16SZ; 152 hp->qdcount = htons(1); 153 if (op == QUERY || data == NULL) 154 break; 155 /* 156 * Make an additional record for completion domain. 157 */ 158 if ((ep - cp) < RRFIXEDSZ) 159 return (-1); 160 n = dn_comp((const char *)data, cp, ep - cp - RRFIXEDSZ, 161 dnptrs, lastdnptr); 162 if (n < 0) 163 return (-1); 164 cp += n; 165 ns_put16(T_NULL, cp); 166 cp += INT16SZ; 167 ns_put16(class, cp); 168 cp += INT16SZ; 169 ns_put32(0, cp); 170 cp += INT32SZ; 171 ns_put16(0, cp); 172 cp += INT16SZ; 173 hp->arcount = htons(1); 174 break; 175 176 case IQUERY: 177 /* 178 * Initialize answer section 179 */ 180 if (ep - cp < 1 + RRFIXEDSZ + datalen) 181 return (-1); 182 *cp++ = '\0'; /*%< no domain name */ 183 ns_put16(type, cp); 184 cp += INT16SZ; 185 ns_put16(class, cp); 186 cp += INT16SZ; 187 ns_put32(0, cp); 188 cp += INT32SZ; 189 ns_put16(datalen, cp); 190 cp += INT16SZ; 191 if (datalen) { 192 memcpy(cp, data, datalen); 193 cp += datalen; 194 } 195 hp->ancount = htons(1); 196 break; 197 198 default: 199 return (-1); 200 } 201 return (cp - buf); 202} 203 204#ifdef RES_USE_EDNS0 205/* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */ 206 207int 208res_nopt(res_state statp, 209 int n0, /*%< current offset in buffer */ 210 u_char *buf, /*%< buffer to put query */ 211 int buflen, /*%< size of buffer */ 212 int anslen) /*%< UDP answer buffer size */ 213{ 214 HEADER *hp; 215 u_char *cp, *ep; 216 u_int16_t flags = 0; 217 218#ifdef DEBUG 219 if ((statp->options & RES_DEBUG) != 0U) 220 printf(";; res_nopt()\n"); 221#endif 222 223 hp = (HEADER *) buf; 224 cp = buf + n0; 225 ep = buf + buflen; 226 227 if ((ep - cp) < 1 + RRFIXEDSZ) 228 return (-1); 229 230 *cp++ = 0; /*%< "." */ 231 ns_put16(ns_t_opt, cp); /*%< TYPE */ 232 cp += INT16SZ; 233 if (anslen > 0xffff) 234 anslen = 0xffff; /* limit to 16bit value */ 235 ns_put16(anslen & 0xffff, cp); /*%< CLASS = UDP payload size */ 236 cp += INT16SZ; 237 *cp++ = NOERROR; /*%< extended RCODE */ 238 *cp++ = 0; /*%< EDNS version */ 239 240 if (statp->options & RES_USE_DNSSEC) { 241#ifdef DEBUG 242 if (statp->options & RES_DEBUG) 243 printf(";; res_opt()... ENDS0 DNSSEC\n"); 244#endif 245 flags |= NS_OPT_DNSSEC_OK; 246 } 247 ns_put16(flags, cp); 248 cp += INT16SZ; 249 250 ns_put16(0U, cp); /*%< RDLEN */ 251 cp += INT16SZ; 252 253 hp->arcount = htons(ntohs(hp->arcount) + 1); 254 255 return (cp - buf); 256} 257 258/* 259 * Construct variable data (RDATA) block for OPT psuedo-RR, append it 260 * to the buffer, then update the RDLEN field (previously set to zero by 261 * res_nopt()) with the new RDATA length. 262 */ 263int 264res_nopt_rdata(res_state statp, 265 int n0, /*%< current offset in buffer */ 266 u_char *buf, /*%< buffer to put query */ 267 int buflen, /*%< size of buffer */ 268 u_char *rdata, /*%< ptr to start of opt rdata */ 269 u_short code, /*%< OPTION-CODE */ 270 u_short len, /*%< OPTION-LENGTH */ 271 u_char *data) /*%< OPTION_DATA */ 272{ 273 register u_char *cp, *ep; 274 275#ifdef DEBUG 276 if ((statp->options & RES_DEBUG) != 0U) 277 printf(";; res_nopt_rdata()\n"); 278#endif 279 280 cp = buf + n0; 281 ep = buf + buflen; 282 283 if ((ep - cp) < (4 + len)) 284 return (-1); 285 286 if (rdata < (buf + 2) || rdata >= ep) 287 return (-1); 288 289 ns_put16(code, cp); 290 cp += INT16SZ; 291 292 ns_put16(len, cp); 293 cp += INT16SZ; 294 295 memcpy(cp, data, len); 296 cp += len; 297 298 len = cp - rdata; 299 ns_put16(len, rdata - 2); /* Update RDLEN field */ 300 301 return (cp - buf); 302} 303#endif 304 305/*! \file */ 306