res_mkquery.c revision 1.1.1.4
1 /* $NetBSD: res_mkquery.c,v 1.1.1.4 2009/04/12 16:35:48 christos Exp $ */ 2 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. All advertising materials mentioning features or use of this software 33 * must display the following acknowledgement: 34 * This product includes software developed by the University of 35 * California, Berkeley and its contributors. 36 * 4. Neither the name of the University nor the names of its contributors 37 * may be used to endorse or promote products derived from this software 38 * without specific prior written permission. 39 * 40 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 */ 52 53 /* 54 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 55 * 56 * Permission to use, copy, modify, and distribute this software for any 57 * purpose with or without fee is hereby granted, provided that the above 58 * copyright notice and this permission notice appear in all copies, and that 59 * the name of Digital Equipment Corporation not be used in advertising or 60 * publicity pertaining to distribution of the document or software without 61 * specific, written prior permission. 62 * 63 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 64 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 65 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 66 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 67 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 68 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 69 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 70 * SOFTWARE. 71 */ 72 73 #if defined(LIBC_SCCS) && !defined(lint) 74 static const char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93"; 75 static const char rcsid[] = "Id: res_mkquery.c,v 1.10 2008/12/11 09:59:00 marka Exp"; 76 #endif /* LIBC_SCCS and not lint */ 77 78 #include "port_before.h" 79 #include <sys/types.h> 80 #include <sys/param.h> 81 #include <netinet/in.h> 82 #include <arpa/nameser.h> 83 #include <netdb.h> 84 #include <resolv.h> 85 #include <stdio.h> 86 #include <string.h> 87 #include "port_after.h" 88 89 /* Options. Leave them on. */ 90 #define DEBUG 91 92 extern const char *_res_opcodes[]; 93 94 /*% 95 * Form all types of queries. 96 * Returns the size of the result or -1. 97 */ 98 int 99 res_nmkquery(res_state statp, 100 int op, /*!< opcode of query */ 101 const char *dname, /*!< domain name */ 102 int class, int type, /*!< class and type of query */ 103 const u_char *data, /*!< resource record data */ 104 int datalen, /*!< length of data */ 105 const u_char *newrr_in, /*!< new rr for modify or append */ 106 u_char *buf, /*!< buffer to put query */ 107 int buflen) /*!< size of buffer */ 108 { 109 register HEADER *hp; 110 register u_char *cp, *ep; 111 register int n; 112 u_char *dnptrs[20], **dpp, **lastdnptr; 113 114 UNUSED(newrr_in); 115 116 #ifdef DEBUG 117 if (statp->options & RES_DEBUG) 118 printf(";; res_nmkquery(%s, %s, %s, %s)\n", 119 _res_opcodes[op], dname, p_class(class), p_type(type)); 120 #endif 121 /* 122 * Initialize header fields. 123 */ 124 if ((buf == NULL) || (buflen < HFIXEDSZ)) 125 return (-1); 126 memset(buf, 0, HFIXEDSZ); 127 hp = (HEADER *) buf; 128 statp->id = res_nrandomid(statp); 129 hp->id = htons(statp->id); 130 hp->opcode = op; 131 hp->rd = (statp->options & RES_RECURSE) != 0U; 132 hp->rcode = NOERROR; 133 cp = buf + HFIXEDSZ; 134 ep = buf + buflen; 135 dpp = dnptrs; 136 *dpp++ = buf; 137 *dpp++ = NULL; 138 lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0]; 139 /* 140 * perform opcode specific processing 141 */ 142 switch (op) { 143 case QUERY: /*FALLTHROUGH*/ 144 case NS_NOTIFY_OP: 145 if (ep - cp < QFIXEDSZ) 146 return (-1); 147 if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs, 148 lastdnptr)) < 0) 149 return (-1); 150 cp += n; 151 ns_put16(type, cp); 152 cp += INT16SZ; 153 ns_put16(class, cp); 154 cp += INT16SZ; 155 hp->qdcount = htons(1); 156 if (op == QUERY || data == NULL) 157 break; 158 /* 159 * Make an additional record for completion domain. 160 */ 161 if ((ep - cp) < RRFIXEDSZ) 162 return (-1); 163 n = dn_comp((const char *)data, cp, ep - cp - RRFIXEDSZ, 164 dnptrs, lastdnptr); 165 if (n < 0) 166 return (-1); 167 cp += n; 168 ns_put16(T_NULL, cp); 169 cp += INT16SZ; 170 ns_put16(class, cp); 171 cp += INT16SZ; 172 ns_put32(0, cp); 173 cp += INT32SZ; 174 ns_put16(0, cp); 175 cp += INT16SZ; 176 hp->arcount = htons(1); 177 break; 178 179 case IQUERY: 180 /* 181 * Initialize answer section 182 */ 183 if (ep - cp < 1 + RRFIXEDSZ + datalen) 184 return (-1); 185 *cp++ = '\0'; /*%< no domain name */ 186 ns_put16(type, cp); 187 cp += INT16SZ; 188 ns_put16(class, cp); 189 cp += INT16SZ; 190 ns_put32(0, cp); 191 cp += INT32SZ; 192 ns_put16(datalen, cp); 193 cp += INT16SZ; 194 if (datalen) { 195 memcpy(cp, data, datalen); 196 cp += datalen; 197 } 198 hp->ancount = htons(1); 199 break; 200 201 default: 202 return (-1); 203 } 204 return (cp - buf); 205 } 206 207 #ifdef RES_USE_EDNS0 208 /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */ 209 210 int 211 res_nopt(res_state statp, 212 int n0, /*%< current offset in buffer */ 213 u_char *buf, /*%< buffer to put query */ 214 int buflen, /*%< size of buffer */ 215 int anslen) /*%< UDP answer buffer size */ 216 { 217 register HEADER *hp; 218 register u_char *cp, *ep; 219 u_int16_t flags = 0; 220 221 #ifdef DEBUG 222 if ((statp->options & RES_DEBUG) != 0U) 223 printf(";; res_nopt()\n"); 224 #endif 225 226 hp = (HEADER *) buf; 227 cp = buf + n0; 228 ep = buf + buflen; 229 230 if ((ep - cp) < 1 + RRFIXEDSZ) 231 return (-1); 232 233 *cp++ = 0; /*%< "." */ 234 ns_put16(ns_t_opt, cp); /*%< TYPE */ 235 cp += INT16SZ; 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
Indexes created Tue Sep 30 11:09:46 GMT 2025