1/* 2 * Copyright (c) 1985, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30/* 31 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 32 * 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 35 * copyright notice and this permission notice appear in all copies, and that 36 * the name of Digital Equipment Corporation not be used in advertising or 37 * publicity pertaining to distribution of the document or software without 38 * specific, written prior permission. 39 * 40 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 41 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 42 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 43 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 44 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 45 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 46 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 47 * SOFTWARE. 48 */ 49 50/* 51 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 52 * Portions Copyright (c) 1996-1999 by Internet Software Consortium. 53 * 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 56 * copyright notice and this permission notice appear in all copies. 57 * 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 63 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 64 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 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 1.5.18.2 2008/04/03 23:15:15 marka Exp $"; 70#endif /* LIBC_SCCS and not lint */ 71#include <sys/cdefs.h> 72__FBSDID("$FreeBSD$"); 73 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> 79#include <netdb.h> 80#include <resolv.h> 81#include <stdio.h> 82#include <string.h> 83#include "port_after.h" 84 85/* Options. Leave them on. */ 86#define DEBUG 87 88extern const char *_res_opcodes[]; 89 90/*% 91 * Form all types of queries. 92 * Returns the size of the result or -1. 93 */ 94int 95res_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 */ 104{ 105 HEADER *hp; 106 u_char *cp, *ep; 107 int n; 108 u_char *dnptrs[20], **dpp, **lastdnptr; 109 110 UNUSED(newrr_in); 111 112#ifdef DEBUG 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)); 116#endif 117 /* 118 * Initialize header fields. 119 */ 120 if ((buf == NULL) || (buflen < HFIXEDSZ)) 121 return (-1); 122 memset(buf, 0, HFIXEDSZ); 123 hp = (HEADER *) buf; 124 hp->id = htons(++statp->id); 125 hp->opcode = op; 126 hp->rd = (statp->options & RES_RECURSE) != 0U; 127 hp->rcode = NOERROR; 128 cp = buf + HFIXEDSZ; 129 ep = buf + buflen; 130 dpp = dnptrs; 131 *dpp++ = buf; 132 *dpp++ = NULL; 133 lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0]; 134 /* 135 * perform opcode specific processing 136 */ 137 switch (op) { 138 case QUERY: /*FALLTHROUGH*/ 139 case NS_NOTIFY_OP: 140 if (ep - cp < QFIXEDSZ) 141 return (-1); 142 if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs, 143 lastdnptr)) < 0) 144 return (-1); 145 cp += n; 146 ns_put16(type, cp); 147 cp += INT16SZ; 148 ns_put16(class, cp); 149 cp += INT16SZ; 150 hp->qdcount = htons(1); 151 if (op == QUERY || data == NULL) 152 break; 153 /* 154 * Make an additional record for completion domain. 155 */ 156 if ((ep - cp) < RRFIXEDSZ) 157 return (-1); 158 n = dn_comp((const char *)data, cp, ep - cp - RRFIXEDSZ, 159 dnptrs, lastdnptr); 160 if (n < 0) 161 return (-1); 162 cp += n; 163 ns_put16(T_NULL, cp); 164 cp += INT16SZ; 165 ns_put16(class, cp); 166 cp += INT16SZ; 167 ns_put32(0, cp); 168 cp += INT32SZ; 169 ns_put16(0, cp); 170 cp += INT16SZ; 171 hp->arcount = htons(1); 172 break; 173 174 case IQUERY: 175 /* 176 * Initialize answer section 177 */ 178 if (ep - cp < 1 + RRFIXEDSZ + datalen) 179 return (-1); 180 *cp++ = '\0'; /*%< no domain name */ 181 ns_put16(type, cp); 182 cp += INT16SZ; 183 ns_put16(class, cp); 184 cp += INT16SZ; 185 ns_put32(0, cp); 186 cp += INT32SZ; 187 ns_put16(datalen, cp); 188 cp += INT16SZ; 189 if (datalen) { 190 memcpy(cp, data, datalen); 191 cp += datalen; 192 } 193 hp->ancount = htons(1); 194 break; 195 196 default: 197 return (-1); 198 } 199 return (cp - buf); 200} 201 202#ifdef RES_USE_EDNS0 203/* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */ 204 205int 206res_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 */ 211{ 212 HEADER *hp; 213 u_char *cp, *ep; 214 u_int16_t flags = 0; 215 216#ifdef DEBUG 217 if ((statp->options & RES_DEBUG) != 0U) 218 printf(";; res_nopt()\n"); 219#endif 220 221 hp = (HEADER *) buf; 222 cp = buf + n0; 223 ep = buf + buflen; 224 225 if ((ep - cp) < 1 + RRFIXEDSZ) 226 return (-1); 227 228 *cp++ = 0; /*%< "." */ 229 ns_put16(ns_t_opt, cp); /*%< TYPE */ 230 cp += INT16SZ; 231 if (anslen > 0xffff) 232 anslen = 0xffff; /* limit to 16bit value */ 233 ns_put16(anslen & 0xffff, cp); /*%< CLASS = UDP payload size */ 234 cp += INT16SZ; 235 *cp++ = NOERROR; /*%< extended RCODE */ 236 *cp++ = 0; /*%< EDNS version */ 237 238 if (statp->options & RES_USE_DNSSEC) { 239#ifdef DEBUG 240 if (statp->options & RES_DEBUG) 241 printf(";; res_opt()... ENDS0 DNSSEC\n"); 242#endif 243 flags |= NS_OPT_DNSSEC_OK; 244 } 245 ns_put16(flags, cp); 246 cp += INT16SZ; 247 248 ns_put16(0U, cp); /*%< RDLEN */ 249 cp += INT16SZ; 250 251 hp->arcount = htons(ntohs(hp->arcount) + 1); 252 253 return (cp - buf); 254} 255 256/* 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. 260 */ 261int 262res_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 */ 270{ 271 register u_char *cp, *ep; 272 273#ifdef DEBUG 274 if ((statp->options & RES_DEBUG) != 0U) 275 printf(";; res_nopt_rdata()\n"); 276#endif 277 278 cp = buf + n0; 279 ep = buf + buflen; 280 281 if ((ep - cp) < (4 + len)) 282 return (-1); 283 284 if (rdata < (buf + 2) || rdata >= ep) 285 return (-1); 286 287 ns_put16(code, cp); 288 cp += INT16SZ; 289 290 ns_put16(len, cp); 291 cp += INT16SZ; 292 293 memcpy(cp, data, len); 294 cp += len; 295 296 len = cp - rdata; 297 ns_put16(len, rdata - 2); /* Update RDLEN field */ 298 299 return (cp - buf); 300} 301#endif 302 303/*! \file */ 304