1 /* $NetBSD: res_mkquery.c,v 1.9 2008/06/21 20:41:48 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1985, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 /* 37 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 38 * 39 * Permission to use, copy, modify, and distribute this software for any 40 * purpose with or without fee is hereby granted, provided that the above 41 * copyright notice and this permission notice appear in all copies, and that 42 * the name of Digital Equipment Corporation not be used in advertising or 43 * publicity pertaining to distribution of the document or software without 44 * specific, written prior permission. 45 * 46 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 47 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 48 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 49 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 50 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 51 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 52 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 53 * SOFTWARE. 54 */ 55 56 /* 57 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 58 * Portions Copyright (c) 1996-1999 by Internet Software Consortium. 59 * 60 * Permission to use, copy, modify, and distribute this software for any 61 * purpose with or without fee is hereby granted, provided that the above 62 * copyright notice and this permission notice appear in all copies. 63 * 64 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 65 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 66 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 67 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 68 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 69 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 70 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 71 */ 72 73 #include <sys/cdefs.h> 74 #if defined(LIBC_SCCS) && !defined(lint) 75 #ifdef notdef 76 static const char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93"; 77 static const char rcsid[] = "Id: res_mkquery.c,v 1.6.672.1 2008/04/03 02:12:21 marka Exp"; 78 #else 79 __RCSID("$NetBSD: res_mkquery.c,v 1.9 2008/06/21 20:41:48 christos Exp $"); 80 #endif 81 #endif /* LIBC_SCCS and not lint */ 82 83 #include "port_before.h" 84 85 #include "namespace.h" 86 #include <sys/types.h> 87 #include <sys/param.h> 88 #include <netinet/in.h> 89 #include <arpa/nameser.h> 90 #include <netdb.h> 91 #include <resolv.h> 92 #include <stdio.h> 93 #include <string.h> 94 #include "port_after.h" 95 96 #if 0 97 #ifdef __weak_alias 98 __weak_alias(res_nmkquery,_res_nmkquery) 99 __weak_alias(res_nopt,_res_nopt) 100 #endif 101 #endif 102 103 /* Options. Leave them on. */ 104 #define DEBUG 105 106 extern const char *_res_opcodes[]; 107 108 /*% 109 * Form all types of queries. 110 * Returns the size of the result or -1. 111 */ 112 int 113 res_nmkquery(res_state statp, 114 int op, /*!< opcode of query */ 115 const char *dname, /*!< domain name */ 116 int class, int type, /*!< class and type of query */ 117 const u_char *data, /*!< resource record data */ 118 int datalen, /*!< length of data */ 119 const u_char *newrr_in, /*!< new rr for modify or append */ 120 u_char *buf, /*!< buffer to put query */ 121 int buflen) /*!< size of buffer */ 122 { 123 register HEADER *hp; 124 register u_char *cp, *ep; 125 register int n; 126 u_char *dnptrs[20], **dpp, **lastdnptr; 127 128 UNUSED(newrr_in); 129 130 #ifdef DEBUG 131 if (statp->options & RES_DEBUG) 132 printf(";; res_nmkquery(%s, %s, %s, %s)\n", 133 _res_opcodes[op], dname, p_class(class), p_type(type)); 134 #endif 135 /* 136 * Initialize header fields. 137 */ 138 if ((buf == NULL) || (buflen < HFIXEDSZ)) 139 return (-1); 140 memset(buf, 0, HFIXEDSZ); 141 hp = (HEADER *)(void *)buf; 142 hp->id = htons(++statp->id); 143 hp->opcode = op; 144 hp->rd = (statp->options & RES_RECURSE) != 0U; 145 hp->rcode = NOERROR; 146 cp = buf + HFIXEDSZ; 147 ep = buf + buflen; 148 dpp = dnptrs; 149 *dpp++ = buf; 150 *dpp++ = NULL; 151 lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0]; 152 /* 153 * perform opcode specific processing 154 */ 155 switch (op) { 156 case QUERY: /*FALLTHROUGH*/ 157 case NS_NOTIFY_OP: 158 if (ep - cp < QFIXEDSZ) 159 return (-1); 160 if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs, 161 lastdnptr)) < 0) 162 return (-1); 163 cp += n; 164 ns_put16(type, cp); 165 cp += INT16SZ; 166 ns_put16(class, cp); 167 cp += INT16SZ; 168 hp->qdcount = htons(1); 169 if (op == QUERY || data == NULL) 170 break; 171 /* 172 * Make an additional record for completion domain. 173 */ 174 if ((ep - cp) < RRFIXEDSZ) 175 return (-1); 176 n = dn_comp((const char *)data, cp, ep - cp - RRFIXEDSZ, 177 dnptrs, lastdnptr); 178 if (n < 0) 179 return (-1); 180 cp += n; 181 ns_put16(T_NULL, cp); 182 cp += INT16SZ; 183 ns_put16(class, cp); 184 cp += INT16SZ; 185 ns_put32(0, cp); 186 cp += INT32SZ; 187 ns_put16(0, cp); 188 cp += INT16SZ; 189 hp->arcount = htons(1); 190 break; 191 192 case IQUERY: 193 /* 194 * Initialize answer section 195 */ 196 if (ep - cp < 1 + RRFIXEDSZ + datalen) 197 return (-1); 198 *cp++ = '\0'; /*%< no domain name */ 199 ns_put16(type, cp); 200 cp += INT16SZ; 201 ns_put16(class, cp); 202 cp += INT16SZ; 203 ns_put32(0, cp); 204 cp += INT32SZ; 205 ns_put16(datalen, cp); 206 cp += INT16SZ; 207 if (datalen) { 208 memcpy(cp, data, (size_t)datalen); 209 cp += datalen; 210 } 211 hp->ancount = htons(1); 212 break; 213 214 default: 215 return (-1); 216 } 217 return (cp - buf); 218 } 219 220 #ifdef RES_USE_EDNS0 221 /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */ 222 223 int 224 res_nopt(res_state statp, 225 int n0, /*%< current offset in buffer */ 226 u_char *buf, /*%< buffer to put query */ 227 int buflen, /*%< size of buffer */ 228 int anslen) /*%< UDP answer buffer size */ 229 { 230 register HEADER *hp; 231 register u_char *cp, *ep; 232 u_int16_t flags = 0; 233 234 #ifdef DEBUG 235 if ((statp->options & RES_DEBUG) != 0U) 236 printf(";; res_nopt()\n"); 237 #endif 238 239 hp = (HEADER *)(void *)buf; 240 cp = buf + n0; 241 ep = buf + buflen; 242 243 if ((ep - cp) < 1 + RRFIXEDSZ) 244 return (-1); 245 246 *cp++ = 0; /*%< "." */ 247 ns_put16(ns_t_opt, cp); /*%< TYPE */ 248 cp += INT16SZ; 249 ns_put16(anslen & 0xffff, cp); /*%< CLASS = UDP payload size */ 250 cp += INT16SZ; 251 *cp++ = NOERROR; /*%< extended RCODE */ 252 *cp++ = 0; /*%< EDNS version */ 253 254 if (statp->options & RES_USE_DNSSEC) { 255 #ifdef DEBUG 256 if (statp->options & RES_DEBUG) 257 printf(";; res_opt()... ENDS0 DNSSEC\n"); 258 #endif 259 flags |= NS_OPT_DNSSEC_OK; 260 } 261 ns_put16(flags, cp); 262 cp += INT16SZ; 263 264 ns_put16(0U, cp); /*%< RDLEN */ 265 cp += INT16SZ; 266 267 hp->arcount = htons(ntohs(hp->arcount) + 1); 268 269 return (cp - buf); 270 } 271 272 /* 273 * Construct variable data (RDATA) block for OPT psuedo-RR, append it 274 * to the buffer, then update the RDLEN field (previously set to zero by 275 * res_nopt()) with the new RDATA length. 276 */ 277 int 278 res_nopt_rdata(res_state statp, 279 int n0, /*%< current offset in buffer */ 280 u_char *buf, /*%< buffer to put query */ 281 int buflen, /*%< size of buffer */ 282 u_char *rdata, /*%< ptr to start of opt rdata */ 283 u_short code, /*%< OPTION-CODE */ 284 u_short len, /*%< OPTION-LENGTH */ 285 u_char *data) /*%< OPTION_DATA */ 286 { 287 register u_char *cp, *ep; 288 289 #ifdef DEBUG 290 if ((statp->options & RES_DEBUG) != 0U) 291 printf(";; res_nopt_rdata()\n"); 292 #endif 293 294 cp = buf + n0; 295 ep = buf + buflen; 296 297 if ((ep - cp) < (4 + len)) 298 return (-1); 299 300 if (rdata < (buf + 2) || rdata >= ep) 301 return (-1); 302 303 ns_put16(code, cp); 304 cp += INT16SZ; 305 306 ns_put16(len, cp); 307 cp += INT16SZ; 308 309 memcpy(cp, data, len); 310 cp += len; 311 312 len = cp - rdata; 313 ns_put16(len, rdata - 2); /* Update RDLEN field */ 314 315 return (cp - buf); 316 } 317 #endif 318 319 /*! \file */ 320