res_mkquery.c revision 1.3
1 /* $NetBSD: res_mkquery.c,v 1.3 2004/05/20 19:43:39 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 1.3 2004/05/20 19:43:39 christos Exp $"); 80 #endif 81 #endif /* LIBC_SCCS and not lint */ 82 83 #include "port_before.h" 84 #include <sys/types.h> 85 #include <sys/param.h> 86 #include <netinet/in.h> 87 #include <arpa/nameser.h> 88 #include <netdb.h> 89 #include <resolv.h> 90 #include <stdio.h> 91 #include <string.h> 92 #include "port_after.h" 93 94 /* Options. Leave them on. */ 95 #define DEBUG 96 97 extern const char *_res_opcodes[]; 98 99 /* 100 * Form all types of queries. 101 * Returns the size of the result or -1. 102 */ 103 int 104 res_nmkquery(res_state statp, 105 int op, /* opcode of query */ 106 const char *dname, /* domain name */ 107 int class, int type, /* class and type of query */ 108 const u_char *data, /* resource record data */ 109 int datalen, /* length of data */ 110 const u_char *newrr_in, /* new rr for modify or append */ 111 u_char *buf, /* buffer to put query */ 112 int buflen) /* size of buffer */ 113 { 114 register HEADER *hp; 115 register u_char *cp, *ep; 116 register int n; 117 u_char *dnptrs[20], **dpp, **lastdnptr; 118 119 UNUSED(newrr_in); 120 121 #ifdef DEBUG 122 if (statp->options & RES_DEBUG) 123 printf(";; res_nmkquery(%s, %s, %s, %s)\n", 124 _res_opcodes[op], dname, p_class(class), p_type(type)); 125 #endif 126 /* 127 * Initialize header fields. 128 */ 129 if ((buf == NULL) || (buflen < HFIXEDSZ)) 130 return (-1); 131 memset(buf, 0, HFIXEDSZ); 132 hp = (HEADER *)(void *)buf; 133 hp->id = htons(++statp->id); 134 hp->opcode = op; 135 hp->rd = (statp->options & RES_RECURSE) != 0U; 136 hp->rcode = NOERROR; 137 cp = buf + HFIXEDSZ; 138 ep = buf + buflen; 139 dpp = dnptrs; 140 *dpp++ = buf; 141 *dpp++ = NULL; 142 lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0]; 143 /* 144 * perform opcode specific processing 145 */ 146 switch (op) { 147 case QUERY: /*FALLTHROUGH*/ 148 case NS_NOTIFY_OP: 149 if (ep - cp < QFIXEDSZ) 150 return (-1); 151 if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs, 152 lastdnptr)) < 0) 153 return (-1); 154 cp += n; 155 ns_put16(type, cp); 156 cp += INT16SZ; 157 ns_put16(class, cp); 158 cp += INT16SZ; 159 hp->qdcount = htons(1); 160 if (op == QUERY || data == NULL) 161 break; 162 /* 163 * Make an additional record for completion domain. 164 */ 165 if ((ep - cp) < RRFIXEDSZ) 166 return (-1); 167 n = dn_comp((const char *)data, cp, ep - cp - RRFIXEDSZ, 168 dnptrs, lastdnptr); 169 if (n < 0) 170 return (-1); 171 cp += n; 172 ns_put16(T_NULL, cp); 173 cp += INT16SZ; 174 ns_put16(class, cp); 175 cp += INT16SZ; 176 ns_put32(0, cp); 177 cp += INT32SZ; 178 ns_put16(0, cp); 179 cp += INT16SZ; 180 hp->arcount = htons(1); 181 break; 182 183 case IQUERY: 184 /* 185 * Initialize answer section 186 */ 187 if (ep - cp < 1 + RRFIXEDSZ + datalen) 188 return (-1); 189 *cp++ = '\0'; /* no domain name */ 190 ns_put16(type, cp); 191 cp += INT16SZ; 192 ns_put16(class, cp); 193 cp += INT16SZ; 194 ns_put32(0, cp); 195 cp += INT32SZ; 196 ns_put16(datalen, cp); 197 cp += INT16SZ; 198 if (datalen) { 199 memcpy(cp, data, (size_t)datalen); 200 cp += datalen; 201 } 202 hp->ancount = htons(1); 203 break; 204 205 default: 206 return (-1); 207 } 208 return (cp - buf); 209 } 210 211 #ifdef RES_USE_EDNS0 212 /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */ 213 #ifndef T_OPT 214 #define T_OPT 41 215 #endif 216 217 int 218 res_nopt(res_state statp, 219 int n0, /* current offset in buffer */ 220 u_char *buf, /* buffer to put query */ 221 int buflen, /* size of buffer */ 222 int anslen) /* UDP answer buffer size */ 223 { 224 register HEADER *hp; 225 register u_char *cp, *ep; 226 u_int16_t flags = 0; 227 228 #ifdef DEBUG 229 if ((statp->options & RES_DEBUG) != 0U) 230 printf(";; res_nopt()\n"); 231 #endif 232 233 hp = (HEADER *)(void *)buf; 234 cp = buf + n0; 235 ep = buf + buflen; 236 237 if ((ep - cp) < 1 + RRFIXEDSZ) 238 return (-1); 239 240 *cp++ = 0; /* "." */ 241 242 ns_put16(T_OPT, cp); /* TYPE */ 243 cp += INT16SZ; 244 ns_put16(anslen & 0xffff, cp); /* CLASS = UDP payload size */ 245 cp += INT16SZ; 246 *cp++ = NOERROR; /* extended RCODE */ 247 *cp++ = 0; /* EDNS version */ 248 if (statp->options & RES_USE_DNSSEC) { 249 #ifdef DEBUG 250 if (statp->options & RES_DEBUG) 251 printf(";; res_opt()... ENDS0 DNSSEC\n"); 252 #endif 253 flags |= NS_OPT_DNSSEC_OK; 254 } 255 ns_put16(flags, cp); 256 cp += INT16SZ; 257 ns_put16(0, cp); /* RDLEN */ 258 cp += INT16SZ; 259 hp->arcount = htons(ntohs(hp->arcount) + 1); 260 261 return (cp - buf); 262 } 263 #endif 264
Indexes created Tue Sep 30 07:10:03 GMT 2025