res_mkquery.c revision 1.4
1 /* $NetBSD: res_mkquery.c,v 1.4 2004/05/21 15:35:05 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 1.4 2004/05/21 15:35:05 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 #ifdef __weak_alias 97 __weak_alias(res_nmkquery,_res_nmkquery) 98 __weak_alias(res_nopt,_res_nopt) 99 #endif 100 101 /* Options. Leave them on. */ 102 #define DEBUG 103 104 extern const char *_res_opcodes[]; 105 106 /* 107 * Form all types of queries. 108 * Returns the size of the result or -1. 109 */ 110 int 111 res_nmkquery(res_state statp, 112 int op, /* opcode of query */ 113 const char *dname, /* domain name */ 114 int class, int type, /* class and type of query */ 115 const u_char *data, /* resource record data */ 116 int datalen, /* length of data */ 117 const u_char *newrr_in, /* new rr for modify or append */ 118 u_char *buf, /* buffer to put query */ 119 int buflen) /* size of buffer */ 120 { 121 register HEADER *hp; 122 register u_char *cp, *ep; 123 register int n; 124 u_char *dnptrs[20], **dpp, **lastdnptr; 125 126 UNUSED(newrr_in); 127 128 #ifdef DEBUG 129 if (statp->options & RES_DEBUG) 130 printf(";; res_nmkquery(%s, %s, %s, %s)\n", 131 _res_opcodes[op], dname, p_class(class), p_type(type)); 132 #endif 133 /* 134 * Initialize header fields. 135 */ 136 if ((buf == NULL) || (buflen < HFIXEDSZ)) 137 return (-1); 138 memset(buf, 0, HFIXEDSZ); 139 hp = (HEADER *)(void *)buf; 140 hp->id = htons(++statp->id); 141 hp->opcode = op; 142 hp->rd = (statp->options & RES_RECURSE) != 0U; 143 hp->rcode = NOERROR; 144 cp = buf + HFIXEDSZ; 145 ep = buf + buflen; 146 dpp = dnptrs; 147 *dpp++ = buf; 148 *dpp++ = NULL; 149 lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0]; 150 /* 151 * perform opcode specific processing 152 */ 153 switch (op) { 154 case QUERY: /*FALLTHROUGH*/ 155 case NS_NOTIFY_OP: 156 if (ep - cp < QFIXEDSZ) 157 return (-1); 158 if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs, 159 lastdnptr)) < 0) 160 return (-1); 161 cp += n; 162 ns_put16(type, cp); 163 cp += INT16SZ; 164 ns_put16(class, cp); 165 cp += INT16SZ; 166 hp->qdcount = htons(1); 167 if (op == QUERY || data == NULL) 168 break; 169 /* 170 * Make an additional record for completion domain. 171 */ 172 if ((ep - cp) < RRFIXEDSZ) 173 return (-1); 174 n = dn_comp((const char *)data, cp, ep - cp - RRFIXEDSZ, 175 dnptrs, lastdnptr); 176 if (n < 0) 177 return (-1); 178 cp += n; 179 ns_put16(T_NULL, cp); 180 cp += INT16SZ; 181 ns_put16(class, cp); 182 cp += INT16SZ; 183 ns_put32(0, cp); 184 cp += INT32SZ; 185 ns_put16(0, cp); 186 cp += INT16SZ; 187 hp->arcount = htons(1); 188 break; 189 190 case IQUERY: 191 /* 192 * Initialize answer section 193 */ 194 if (ep - cp < 1 + RRFIXEDSZ + datalen) 195 return (-1); 196 *cp++ = '\0'; /* no domain name */ 197 ns_put16(type, cp); 198 cp += INT16SZ; 199 ns_put16(class, cp); 200 cp += INT16SZ; 201 ns_put32(0, cp); 202 cp += INT32SZ; 203 ns_put16(datalen, cp); 204 cp += INT16SZ; 205 if (datalen) { 206 memcpy(cp, data, (size_t)datalen); 207 cp += datalen; 208 } 209 hp->ancount = htons(1); 210 break; 211 212 default: 213 return (-1); 214 } 215 return (cp - buf); 216 } 217 218 #ifdef RES_USE_EDNS0 219 /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */ 220 #ifndef T_OPT 221 #define T_OPT 41 222 #endif 223 224 int 225 res_nopt(res_state statp, 226 int n0, /* current offset in buffer */ 227 u_char *buf, /* buffer to put query */ 228 int buflen, /* size of buffer */ 229 int anslen) /* UDP answer buffer size */ 230 { 231 register HEADER *hp; 232 register u_char *cp, *ep; 233 u_int16_t flags = 0; 234 235 #ifdef DEBUG 236 if ((statp->options & RES_DEBUG) != 0U) 237 printf(";; res_nopt()\n"); 238 #endif 239 240 hp = (HEADER *)(void *)buf; 241 cp = buf + n0; 242 ep = buf + buflen; 243 244 if ((ep - cp) < 1 + RRFIXEDSZ) 245 return (-1); 246 247 *cp++ = 0; /* "." */ 248 249 ns_put16(T_OPT, cp); /* TYPE */ 250 cp += INT16SZ; 251 ns_put16(anslen & 0xffff, cp); /* CLASS = UDP payload size */ 252 cp += INT16SZ; 253 *cp++ = NOERROR; /* extended RCODE */ 254 *cp++ = 0; /* EDNS version */ 255 if (statp->options & RES_USE_DNSSEC) { 256 #ifdef DEBUG 257 if (statp->options & RES_DEBUG) 258 printf(";; res_opt()... ENDS0 DNSSEC\n"); 259 #endif 260 flags |= NS_OPT_DNSSEC_OK; 261 } 262 ns_put16(flags, cp); 263 cp += INT16SZ; 264 ns_put16(0, cp); /* RDLEN */ 265 cp += INT16SZ; 266 hp->arcount = htons(ntohs(hp->arcount) + 1); 267 268 return (cp - buf); 269 } 270 #endif 271
Indexes created Tue Sep 30 11:09:46 GMT 2025