1 /*-
2 * SPDX-License-Identifier: (ISC AND BSD-3-Clause)
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. Neither the name of the University nor the names of its contributors
33 * may be used to endorse or promote products derived from this software
34 * without specific prior written permission.
35 *
36 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
37 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
39 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
40 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
41 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
42 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
44 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
45 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
46 * SUCH DAMAGE.
47 */
48
49 /*
50 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
51 *
52 * Permission to use, copy, modify, and distribute this software for any
53 * purpose with or without fee is hereby granted, provided that the above
54 * copyright notice and this permission notice appear in all copies, and that
55 * the name of Digital Equipment Corporation not be used in advertising or
56 * publicity pertaining to distribution of the document or software without
57 * specific, written prior permission.
58 *
59 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
60 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
61 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
62 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
63 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
64 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
65 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
66 * SOFTWARE.
67 */
68
69 #if defined(LIBC_SCCS) && !defined(lint)
70 static const char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93";
71 static const char rcsid[] = "$Id: res_mkquery.c,v 1.10 2008/12/11 09:59:00 marka Exp $";
72 #endif /* LIBC_SCCS and not lint */
73 #include <sys/cdefs.h>
74 __FBSDID("$FreeBSD$");
75
76 #include "port_before.h"
77 #include <sys/param.h>
78 #include <netinet/in.h>
79 #include <arpa/nameser.h>
80 #include <netdb.h>
81 #include <resolv.h>
82 #include <stdio.h>
83 #include <string.h>
84 #include "port_after.h"
85
86 /* Options. Leave them on. */
87 #ifndef DEBUG
88 #define DEBUG
89 #endif
90
91 extern const char *_res_opcodes[];
92
93 /*%
94 * Form all types of queries.
95 * Returns the size of the result or -1.
96 */
97 int
res_nmkquery(res_state statp,int op,const char * dname,int class,int type,const u_char * data,int datalen,const u_char * newrr_in,u_char * buf,int buflen)98 res_nmkquery(res_state statp,
99 int op, /*!< opcode of query */
100 const char *dname, /*!< domain name */
101 int class, int type, /*!< class and type of query */
102 const u_char *data, /*!< resource record data */
103 int datalen, /*!< length of data */
104 const u_char *newrr_in, /*!< new rr for modify or append */
105 u_char *buf, /*!< buffer to put query */
106 int buflen) /*!< size of buffer */
107 {
108 HEADER *hp;
109 u_char *cp, *ep;
110 int n;
111 u_char *dnptrs[20], **dpp, **lastdnptr;
112
113 UNUSED(newrr_in);
114
115 #ifdef DEBUG
116 if (statp->options & RES_DEBUG)
117 printf(";; res_nmkquery(%s, %s, %s, %s)\n",
118 _res_opcodes[op], dname, p_class(class), p_type(type));
119 #endif
120 /*
121 * Initialize header fields.
122 */
123 if ((buf == NULL) || (buflen < HFIXEDSZ))
124 return (-1);
125 memset(buf, 0, HFIXEDSZ);
126 hp = (HEADER *) buf;
127 statp->id = res_nrandomid(statp);
128 hp->id = htons(statp->id);
129 hp->opcode = op;
130 hp->rd = (statp->options & RES_RECURSE) != 0U;
131 hp->rcode = NOERROR;
132 cp = buf + HFIXEDSZ;
133 ep = buf + buflen;
134 dpp = dnptrs;
135 *dpp++ = buf;
136 *dpp++ = NULL;
137 lastdnptr = dnptrs + nitems(dnptrs);
138 /*
139 * perform opcode specific processing
140 */
141 switch (op) {
142 case QUERY: /*FALLTHROUGH*/
143 case NS_NOTIFY_OP:
144 if (ep - cp < QFIXEDSZ)
145 return (-1);
146 if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs,
147 lastdnptr)) < 0)
148 return (-1);
149 cp += n;
150 ns_put16(type, cp);
151 cp += INT16SZ;
152 ns_put16(class, cp);
153 cp += INT16SZ;
154 hp->qdcount = htons(1);
155 if (op == QUERY || data == NULL)
156 break;
157 /*
158 * Make an additional record for completion domain.
159 */
160 if ((ep - cp) < RRFIXEDSZ)
161 return (-1);
162 n = dn_comp((const char *)data, cp, ep - cp - RRFIXEDSZ,
163 dnptrs, lastdnptr);
164 if (n < 0)
165 return (-1);
166 cp += n;
167 ns_put16(T_NULL, cp);
168 cp += INT16SZ;
169 ns_put16(class, cp);
170 cp += INT16SZ;
171 ns_put32(0, cp);
172 cp += INT32SZ;
173 ns_put16(0, cp);
174 cp += INT16SZ;
175 hp->arcount = htons(1);
176 break;
177
178 case IQUERY:
179 /*
180 * Initialize answer section
181 */
182 if (ep - cp < 1 + RRFIXEDSZ + datalen)
183 return (-1);
184 *cp++ = '\0'; /*%< no domain name */
185 ns_put16(type, cp);
186 cp += INT16SZ;
187 ns_put16(class, cp);
188 cp += INT16SZ;
189 ns_put32(0, cp);
190 cp += INT32SZ;
191 ns_put16(datalen, cp);
192 cp += INT16SZ;
193 if (datalen) {
194 memcpy(cp, data, datalen);
195 cp += datalen;
196 }
197 hp->ancount = htons(1);
198 break;
199
200 default:
201 return (-1);
202 }
203 return (cp - buf);
204 }
205
206 #ifdef RES_USE_EDNS0
207 /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */
208
209 int
res_nopt(res_state statp,int n0,u_char * buf,int buflen,int anslen)210 res_nopt(res_state statp,
211 int n0, /*%< current offset in buffer */
212 u_char *buf, /*%< buffer to put query */
213 int buflen, /*%< size of buffer */
214 int anslen) /*%< UDP answer buffer size */
215 {
216 HEADER *hp;
217 u_char *cp, *ep;
218 u_int16_t flags = 0;
219
220 #ifdef DEBUG
221 if ((statp->options & RES_DEBUG) != 0U)
222 printf(";; res_nopt()\n");
223 #endif
224
225 hp = (HEADER *) buf;
226 cp = buf + n0;
227 ep = buf + buflen;
228
229 if ((ep - cp) < 1 + RRFIXEDSZ)
230 return (-1);
231
232 *cp++ = 0; /*%< "." */
233 ns_put16(ns_t_opt, cp); /*%< TYPE */
234 cp += INT16SZ;
235 if (anslen > 0xffff)
236 anslen = 0xffff; /* limit to 16bit value */
237 ns_put16(anslen & 0xffff, cp); /*%< CLASS = UDP payload size */
238 cp += INT16SZ;
239 *cp++ = NOERROR; /*%< extended RCODE */
240 *cp++ = 0; /*%< EDNS version */
241
242 if (statp->options & RES_USE_DNSSEC) {
243 #ifdef DEBUG
244 if (statp->options & RES_DEBUG)
245 printf(";; res_opt()... ENDS0 DNSSEC\n");
246 #endif
247 flags |= NS_OPT_DNSSEC_OK;
248 }
249 ns_put16(flags, cp);
250 cp += INT16SZ;
251
252 ns_put16(0U, cp); /*%< RDLEN */
253 cp += INT16SZ;
254
255 hp->arcount = htons(ntohs(hp->arcount) + 1);
256
257 return (cp - buf);
258 }
259
260 /*
261 * Construct variable data (RDATA) block for OPT psuedo-RR, append it
262 * to the buffer, then update the RDLEN field (previously set to zero by
263 * res_nopt()) with the new RDATA length.
264 */
265 int
res_nopt_rdata(res_state statp,int n0,u_char * buf,int buflen,u_char * rdata,u_short code,u_short len,u_char * data)266 res_nopt_rdata(res_state statp,
267 int n0, /*%< current offset in buffer */
268 u_char *buf, /*%< buffer to put query */
269 int buflen, /*%< size of buffer */
270 u_char *rdata, /*%< ptr to start of opt rdata */
271 u_short code, /*%< OPTION-CODE */
272 u_short len, /*%< OPTION-LENGTH */
273 u_char *data) /*%< OPTION_DATA */
274 {
275 register u_char *cp, *ep;
276
277 #ifdef DEBUG
278 if ((statp->options & RES_DEBUG) != 0U)
279 printf(";; res_nopt_rdata()\n");
280 #endif
281
282 cp = buf + n0;
283 ep = buf + buflen;
284
285 if ((ep - cp) < (4 + len))
286 return (-1);
287
288 if (rdata < (buf + 2) || rdata >= ep)
289 return (-1);
290
291 ns_put16(code, cp);
292 cp += INT16SZ;
293
294 ns_put16(len, cp);
295 cp += INT16SZ;
296
297 memcpy(cp, data, len);
298 cp += len;
299
300 len = cp - rdata;
301 ns_put16(len, rdata - 2); /* Update RDLEN field */
302
303 return (cp - buf);
304 }
305 #endif
306
307 /*! \file */
308