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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 /* 35 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 36 * 37 * Permission to use, copy, modify, and distribute this software for any 38 * purpose with or without fee is hereby granted, provided that the above 39 * copyright notice and this permission notice appear in all copies, and that 40 * the name of Digital Equipment Corporation not be used in advertising or 41 * publicity pertaining to distribution of the document or software without 42 * specific, written prior permission. 43 * 44 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 45 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 46 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 47 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 48 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 49 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 50 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 51 * SOFTWARE. 52 */ 53 54 /* 55 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 56 * Portions Copyright (c) 1996-1999 by Internet Software Consortium. 57 * 58 * Permission to use, copy, modify, and distribute this software for any 59 * purpose with or without fee is hereby granted, provided that the above 60 * copyright notice and this permission notice appear in all copies. 61 * 62 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 63 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 64 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 65 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 66 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 67 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 68 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 69 */ 70 71 #if defined(LIBC_SCCS) && !defined(lint) 72 static const char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93"; 73 static const char rcsid[] = "$Id: res_mkquery.c,v 1.6.672.1 2008/04/03 02:12:21 marka Exp $"; 74 #endif /* LIBC_SCCS and not lint */ 75 76 #include "port_before.h" 77 #include <sys/types.h> 78 #include <sys/param.h> 79 #include <netinet/in.h> 80 #include <arpa/nameser.h> 81 #include <netdb.h> 82 #include <resolv.h> 83 #include <stdio.h> 84 #include <string.h> 85 #include "port_after.h" 86 87 /* Options. Leave them on. */ 88 #define DEBUG 89 90 extern const char *_res_opcodes[]; 91 92 /*% 93 * Form all types of queries. 94 * Returns the size of the result or -1. 95 */ 96 int 97 res_nmkquery(res_state statp, 98 int op, /*!< opcode of query */ 99 const char *dname, /*!< domain name */ 100 int class, int type, /*!< class and type of query */ 101 const u_char *data, /*!< resource record data */ 102 int datalen, /*!< length of data */ 103 const u_char *newrr_in, /*!< new rr for modify or append */ 104 u_char *buf, /*!< buffer to put query */ 105 int buflen) /*!< size of buffer */ 106 { 107 HEADER *hp; 108 u_char *cp, *ep; 109 int n; 110 u_char *dnptrs[20], **dpp, **lastdnptr; 111 112 UNUSED(newrr_in); 113 114 #ifdef DEBUG 115 if (statp->options & RES_DEBUG) 116 printf(";; res_nmkquery(%s, %s, %s, %s)\n", 117 _res_opcodes[op], dname, p_class(class), p_type(type)); 118 #endif 119 /* 120 * Initialize header fields. 121 */ 122 if ((buf == NULL) || (buflen < HFIXEDSZ)) 123 return (-1); 124 memset(buf, 0, HFIXEDSZ); 125 hp = (HEADER *) buf; 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 + sizeof dnptrs / sizeof dnptrs[0]; 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). */ 206 207 int 208 res_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 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 */ 261 int 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 */ 270 { 271 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