1 /* $NetBSD: res_mkquery.c,v 1.6 2006/01/24 17:40:32 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 1.1.2.2.4.2 2004/03/16 12:34:18 marka Exp"; 78 #else 79 __RCSID("$NetBSD: res_mkquery.c,v 1.6 2006/01/24 17:40:32 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 #ifndef DEBUG 105 #define DEBUG 106 #endif 107 108 extern const char *_res_opcodes[]; 109 110 /* 111 * Form all types of queries. 112 * Returns the size of the result or -1. 113 */ 114 int 115 res_nmkquery(res_state statp, 116 int op, /* opcode of query */ 117 const char *dname, /* domain name */ 118 int class, int type, /* class and type of query */ 119 const u_char *data, /* resource record data */ 120 int datalen, /* length of data */ 121 const u_char *newrr_in, /* new rr for modify or append */ 122 u_char *buf, /* buffer to put query */ 123 int buflen) /* size of buffer */ 124 { 125 register HEADER *hp; 126 register u_char *cp, *ep; 127 register int n; 128 u_char *dnptrs[20], **dpp, **lastdnptr; 129 130 UNUSED(newrr_in); 131 132 #ifdef DEBUG 133 if (statp->options & RES_DEBUG) 134 printf(";; res_nmkquery(%s, %s, %s, %s)\n", 135 _res_opcodes[op], dname, p_class(class), p_type(type)); 136 #endif 137 /* 138 * Initialize header fields. 139 */ 140 if ((buf == NULL) || (buflen < HFIXEDSZ)) 141 return (-1); 142 memset(buf, 0, HFIXEDSZ); 143 hp = (HEADER *)(void *)buf; 144 hp->id = htons(++statp->id); 145 hp->opcode = op; 146 hp->rd = (statp->options & RES_RECURSE) != 0U; 147 hp->rcode = NOERROR; 148 cp = buf + HFIXEDSZ; 149 ep = buf + buflen; 150 dpp = dnptrs; 151 *dpp++ = buf; 152 *dpp++ = NULL; 153 lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0]; 154 /* 155 * perform opcode specific processing 156 */ 157 switch (op) { 158 case QUERY: /*FALLTHROUGH*/ 159 case NS_NOTIFY_OP: 160 if (ep - cp < QFIXEDSZ) 161 return (-1); 162 if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs, 163 lastdnptr)) < 0) 164 return (-1); 165 cp += n; 166 ns_put16(type, cp); 167 cp += INT16SZ; 168 ns_put16(class, cp); 169 cp += INT16SZ; 170 hp->qdcount = htons(1); 171 if (op == QUERY || data == NULL) 172 break; 173 /* 174 * Make an additional record for completion domain. 175 */ 176 if ((ep - cp) < RRFIXEDSZ) 177 return (-1); 178 n = dn_comp((const char *)data, cp, ep - cp - RRFIXEDSZ, 179 dnptrs, lastdnptr); 180 if (n < 0) 181 return (-1); 182 cp += n; 183 ns_put16(T_NULL, cp); 184 cp += INT16SZ; 185 ns_put16(class, cp); 186 cp += INT16SZ; 187 ns_put32(0, cp); 188 cp += INT32SZ; 189 ns_put16(0, cp); 190 cp += INT16SZ; 191 hp->arcount = htons(1); 192 break; 193 194 case IQUERY: 195 /* 196 * Initialize answer section 197 */ 198 if (ep - cp < 1 + RRFIXEDSZ + datalen) 199 return (-1); 200 *cp++ = '\0'; /* no domain name */ 201 ns_put16(type, cp); 202 cp += INT16SZ; 203 ns_put16(class, cp); 204 cp += INT16SZ; 205 ns_put32(0, cp); 206 cp += INT32SZ; 207 ns_put16(datalen, cp); 208 cp += INT16SZ; 209 if (datalen) { 210 memcpy(cp, data, (size_t)datalen); 211 cp += datalen; 212 } 213 hp->ancount = htons(1); 214 break; 215 216 default: 217 return (-1); 218 } 219 return (cp - buf); 220 } 221 222 #ifdef RES_USE_EDNS0 223 /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */ 224 #ifndef T_OPT 225 #define T_OPT 41 226 #endif 227 228 int 229 res_nopt(res_state statp, 230 int n0, /* current offset in buffer */ 231 u_char *buf, /* buffer to put query */ 232 int buflen, /* size of buffer */ 233 int anslen) /* UDP answer buffer size */ 234 { 235 register HEADER *hp; 236 register u_char *cp, *ep; 237 u_int16_t flags = 0; 238 239 #ifdef DEBUG 240 if ((statp->options & RES_DEBUG) != 0U) 241 printf(";; res_nopt()\n"); 242 #endif 243 244 hp = (HEADER *)(void *)buf; 245 cp = buf + n0; 246 ep = buf + buflen; 247 248 if ((ep - cp) < 1 + RRFIXEDSZ) 249 return (-1); 250 251 *cp++ = 0; /* "." */ 252 253 ns_put16(T_OPT, cp); /* TYPE */ 254 cp += INT16SZ; 255 ns_put16(anslen & 0xffff, cp); /* CLASS = UDP payload size */ 256 cp += INT16SZ; 257 *cp++ = NOERROR; /* extended RCODE */ 258 *cp++ = 0; /* EDNS version */ 259 if (statp->options & RES_USE_DNSSEC) { 260 #ifdef DEBUG 261 if (statp->options & RES_DEBUG) 262 printf(";; res_opt()... ENDS0 DNSSEC\n"); 263 #endif 264 flags |= NS_OPT_DNSSEC_OK; 265 } 266 ns_put16(flags, cp); 267 cp += INT16SZ; 268 ns_put16(0, cp); /* RDLEN */ 269 cp += INT16SZ; 270 hp->arcount = htons(ntohs(hp->arcount) + 1); 271 272 return (cp - buf); 273 } 274 #endif 275