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) 68 static const char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93"; 69 static 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/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 #ifndef DEBUG 87 #define DEBUG 88 #endif 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 statp->id = res_nrandomid(statp); 127 hp->id = htons(statp->id); 128 hp->opcode = op; 129 hp->rd = (statp->options & RES_RECURSE) != 0U; 130 hp->rcode = NOERROR; 131 cp = buf + HFIXEDSZ; 132 ep = buf + buflen; 133 dpp = dnptrs; 134 *dpp++ = buf; 135 *dpp++ = NULL; 136 lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0]; 137 /* 138 * perform opcode specific processing 139 */ 140 switch (op) { 141 case QUERY: /*FALLTHROUGH*/ 142 case NS_NOTIFY_OP: 143 if (ep - cp < QFIXEDSZ) 144 return (-1); 145 if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs, 146 lastdnptr)) < 0) 147 return (-1); 148 cp += n; 149 ns_put16(type, cp); 150 cp += INT16SZ; 151 ns_put16(class, cp); 152 cp += INT16SZ; 153 hp->qdcount = htons(1); 154 if (op == QUERY || data == NULL) 155 break; 156 /* 157 * Make an additional record for completion domain. 158 */ 159 if ((ep - cp) < RRFIXEDSZ) 160 return (-1); 161 n = dn_comp((const char *)data, cp, ep - cp - RRFIXEDSZ, 162 dnptrs, lastdnptr); 163 if (n < 0) 164 return (-1); 165 cp += n; 166 ns_put16(T_NULL, cp); 167 cp += INT16SZ; 168 ns_put16(class, cp); 169 cp += INT16SZ; 170 ns_put32(0, cp); 171 cp += INT32SZ; 172 ns_put16(0, cp); 173 cp += INT16SZ; 174 hp->arcount = htons(1); 175 break; 176 177 case IQUERY: 178 /* 179 * Initialize answer section 180 */ 181 if (ep - cp < 1 + RRFIXEDSZ + datalen) 182 return (-1); 183 *cp++ = '\0'; /*%< no domain name */ 184 ns_put16(type, cp); 185 cp += INT16SZ; 186 ns_put16(class, cp); 187 cp += INT16SZ; 188 ns_put32(0, cp); 189 cp += INT32SZ; 190 ns_put16(datalen, cp); 191 cp += INT16SZ; 192 if (datalen) { 193 memcpy(cp, data, datalen); 194 cp += datalen; 195 } 196 hp->ancount = htons(1); 197 break; 198 199 default: 200 return (-1); 201 } 202 return (cp - buf); 203 } 204 205 #ifdef RES_USE_EDNS0 206 /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */ 207 208 int 209 res_nopt(res_state statp, 210 int n0, /*%< current offset in buffer */ 211 u_char *buf, /*%< buffer to put query */ 212 int buflen, /*%< size of buffer */ 213 int anslen) /*%< UDP answer buffer size */ 214 { 215 HEADER *hp; 216 u_char *cp, *ep; 217 u_int16_t flags = 0; 218 219 #ifdef DEBUG 220 if ((statp->options & RES_DEBUG) != 0U) 221 printf(";; res_nopt()\n"); 222 #endif 223 224 hp = (HEADER *) buf; 225 cp = buf + n0; 226 ep = buf + buflen; 227 228 if ((ep - cp) < 1 + RRFIXEDSZ) 229 return (-1); 230 231 *cp++ = 0; /*%< "." */ 232 ns_put16(ns_t_opt, cp); /*%< TYPE */ 233 cp += INT16SZ; 234 if (anslen > 0xffff) 235 anslen = 0xffff; /* limit to 16bit value */ 236 ns_put16(anslen & 0xffff, cp); /*%< CLASS = UDP payload size */ 237 cp += INT16SZ; 238 *cp++ = NOERROR; /*%< extended RCODE */ 239 *cp++ = 0; /*%< EDNS version */ 240 241 if (statp->options & RES_USE_DNSSEC) { 242 #ifdef DEBUG 243 if (statp->options & RES_DEBUG) 244 printf(";; res_opt()... ENDS0 DNSSEC\n"); 245 #endif 246 flags |= NS_OPT_DNSSEC_OK; 247 } 248 ns_put16(flags, cp); 249 cp += INT16SZ; 250 251 ns_put16(0U, cp); /*%< RDLEN */ 252 cp += INT16SZ; 253 254 hp->arcount = htons(ntohs(hp->arcount) + 1); 255 256 return (cp - buf); 257 } 258 259 /* 260 * Construct variable data (RDATA) block for OPT psuedo-RR, append it 261 * to the buffer, then update the RDLEN field (previously set to zero by 262 * res_nopt()) with the new RDATA length. 263 */ 264 int 265 res_nopt_rdata(res_state statp, 266 int n0, /*%< current offset in buffer */ 267 u_char *buf, /*%< buffer to put query */ 268 int buflen, /*%< size of buffer */ 269 u_char *rdata, /*%< ptr to start of opt rdata */ 270 u_short code, /*%< OPTION-CODE */ 271 u_short len, /*%< OPTION-LENGTH */ 272 u_char *data) /*%< OPTION_DATA */ 273 { 274 register u_char *cp, *ep; 275 276 #ifdef DEBUG 277 if ((statp->options & RES_DEBUG) != 0U) 278 printf(";; res_nopt_rdata()\n"); 279 #endif 280 281 cp = buf + n0; 282 ep = buf + buflen; 283 284 if ((ep - cp) < (4 + len)) 285 return (-1); 286 287 if (rdata < (buf + 2) || rdata >= ep) 288 return (-1); 289 290 ns_put16(code, cp); 291 cp += INT16SZ; 292 293 ns_put16(len, cp); 294 cp += INT16SZ; 295 296 memcpy(cp, data, len); 297 cp += len; 298 299 len = cp - rdata; 300 ns_put16(len, rdata - 2); /* Update RDLEN field */ 301 302 return (cp - buf); 303 } 304 #endif 305 306 /*! \file */ 307