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