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 84 85 #include <sys/types.h> 86 #include <sys/param.h> 87 #include <netinet/in.h> 88 #include <arpa/nameser.h> 89 #include <netdb.h> 90 #ifdef ANDROID_CHANGES 91 #include "resolv_private.h" 92 #else 93 #include <resolv.h> 94 #endif 95 #include <stdio.h> 96 #include <string.h> 97 98 /* Options. Leave them on. */ 99 #ifndef DEBUG 100 #define DEBUG 101 #endif 102 103 #ifndef lint 104 #define UNUSED(a) (void)&a 105 #else 106 #define UNUSED(a) a = a 107 #endif 108 109 extern const char *_res_opcodes[]; 110 111 /* 112 * Form all types of queries. 113 * Returns the size of the result or -1. 114 */ 115 int 116 res_nmkquery(res_state statp, 117 int op, /* opcode of query */ 118 const char *dname, /* domain name */ 119 int class, int type, /* class and type of query */ 120 const u_char *data, /* resource record data */ 121 int datalen, /* length of data */ 122 const u_char *newrr_in, /* new rr for modify or append */ 123 u_char *buf, /* buffer to put query */ 124 int buflen) /* size of buffer */ 125 { 126 register HEADER *hp; 127 register u_char *cp, *ep; 128 register int n; 129 u_char *dnptrs[20], **dpp, **lastdnptr; 130 131 UNUSED(newrr_in); 132 133 #ifdef DEBUG 134 if (statp->options & RES_DEBUG) 135 printf(";; res_nmkquery(%s, %s, %s, %s)\n", 136 _res_opcodes[op], dname, p_class(class), p_type(type)); 137 #endif 138 /* 139 * Initialize header fields. 140 */ 141 if ((buf == NULL) || (buflen < HFIXEDSZ)) 142 return (-1); 143 memset(buf, 0, HFIXEDSZ); 144 hp = (HEADER *)(void *)buf; 145 hp->id = htons(res_randomid()); 146 hp->opcode = op; 147 hp->rd = (statp->options & RES_RECURSE) != 0U; 148 hp->rcode = NOERROR; 149 cp = buf + HFIXEDSZ; 150 ep = buf + buflen; 151 dpp = dnptrs; 152 *dpp++ = buf; 153 *dpp++ = NULL; 154 lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0]; 155 /* 156 * perform opcode specific processing 157 */ 158 switch (op) { 159 case QUERY: /*FALLTHROUGH*/ 160 case NS_NOTIFY_OP: 161 if (ep - cp < QFIXEDSZ) 162 return (-1); 163 if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs, 164 lastdnptr)) < 0) 165 return (-1); 166 cp += n; 167 ns_put16(type, cp); 168 cp += INT16SZ; 169 ns_put16(class, cp); 170 cp += INT16SZ; 171 hp->qdcount = htons(1); 172 if (op == QUERY || data == NULL) 173 break; 174 /* 175 * Make an additional record for completion domain. 176 */ 177 if ((ep - cp) < RRFIXEDSZ) 178 return (-1); 179 n = dn_comp((const char *)data, cp, ep - cp - RRFIXEDSZ, 180 dnptrs, lastdnptr); 181 if (n < 0) 182 return (-1); 183 cp += n; 184 ns_put16(T_NULL, cp); 185 cp += INT16SZ; 186 ns_put16(class, cp); 187 cp += INT16SZ; 188 ns_put32(0, cp); 189 cp += INT32SZ; 190 ns_put16(0, cp); 191 cp += INT16SZ; 192 hp->arcount = htons(1); 193 break; 194 195 case IQUERY: 196 /* 197 * Initialize answer section 198 */ 199 if (ep - cp < 1 + RRFIXEDSZ + datalen) 200 return (-1); 201 *cp++ = '\0'; /* no domain name */ 202 ns_put16(type, cp); 203 cp += INT16SZ; 204 ns_put16(class, cp); 205 cp += INT16SZ; 206 ns_put32(0, cp); 207 cp += INT32SZ; 208 ns_put16(datalen, cp); 209 cp += INT16SZ; 210 if (datalen) { 211 memcpy(cp, data, (size_t)datalen); 212 cp += datalen; 213 } 214 hp->ancount = htons(1); 215 break; 216 217 default: 218 return (-1); 219 } 220 return (cp - buf); 221 } 222 223 #ifdef RES_USE_EDNS0 224 /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */ 225 #ifndef T_OPT 226 #define T_OPT 41 227 #endif 228 229 int 230 res_nopt(res_state statp, 231 int n0, /* current offset in buffer */ 232 u_char *buf, /* buffer to put query */ 233 int buflen, /* size of buffer */ 234 int anslen) /* UDP answer buffer size */ 235 { 236 register HEADER *hp; 237 register u_char *cp, *ep; 238 u_int16_t flags = 0; 239 240 #ifdef DEBUG 241 if ((statp->options & RES_DEBUG) != 0U) 242 printf(";; res_nopt()\n"); 243 #endif 244 245 hp = (HEADER *)(void *)buf; 246 cp = buf + n0; 247 ep = buf + buflen; 248 249 if ((ep - cp) < 1 + RRFIXEDSZ) 250 return (-1); 251 252 *cp++ = 0; /* "." */ 253 254 ns_put16(T_OPT, cp); /* TYPE */ 255 cp += INT16SZ; 256 ns_put16(anslen & 0xffff, cp); /* CLASS = UDP payload size */ 257 cp += INT16SZ; 258 *cp++ = NOERROR; /* extended RCODE */ 259 *cp++ = 0; /* EDNS version */ 260 if (statp->options & RES_USE_DNSSEC) { 261 #ifdef DEBUG 262 if (statp->options & RES_DEBUG) 263 printf(";; res_opt()... ENDS0 DNSSEC\n"); 264 #endif 265 flags |= NS_OPT_DNSSEC_OK; 266 } 267 ns_put16(flags, cp); 268 cp += INT16SZ; 269 ns_put16(0, cp); /* RDLEN */ 270 cp += INT16SZ; 271 hp->arcount = htons(ntohs(hp->arcount) + 1); 272 273 return (cp - buf); 274 } 275 #endif 276
