1 /*
2 * Copyright (c) 1985, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 /*
35 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
36 *
37 * Permission to use, copy, modify, and distribute this software for any
38 * purpose with or without fee is hereby granted, provided that the above
39 * copyright notice and this permission notice appear in all copies, and that
40 * the name of Digital Equipment Corporation not be used in advertising or
41 * publicity pertaining to distribution of the document or software without
42 * specific, written prior permission.
43 *
44 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
45 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
46 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
47 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
48 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
49 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
50 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
51 * SOFTWARE.
52 */
53
54 /*
55 * Portions Copyright (c) 1996 by Internet Software Consortium.
56 *
57 * Permission to use, copy, modify, and distribute this software for any
58 * purpose with or without fee is hereby granted, provided that the above
59 * copyright notice and this permission notice appear in all copies.
60 *
61 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
62 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
63 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
64 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
65 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
66 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
67 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
68 * SOFTWARE.
69 */
70
71 #if defined(LIBC_SCCS) && !defined(lint)
72 static char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93";
73 static char orig_rcsid[] = "From: Id: res_mkquery.c,v 8.9 1997/04/24 22:22:36 vixie Exp $";
74 #endif /* LIBC_SCCS and not lint */
75 #include <sys/cdefs.h>
76 #include <sys/types.h>
77 #include <machine/endian.h>
78
79 #include <sys/types.h>
80 #include <sys/param.h>
81 #include <netinet/in.h>
82 #include <arpa/nameser.h>
83 #include <netdb.h>
84 #include <resolv.h>
85 #include <stdio.h>
86 #include <string.h>
87
88 #include "res_config.h"
89
90 /*
91 * Form all types of queries.
92 * Returns the size of the result or -1.
93 */
94 int
res_mkquery(op,dname,class,type,data,datalen,newrr_in,buf,buflen)95 res_mkquery(op, dname, class, type, data, datalen, newrr_in, buf, buflen)
96 int op; /* opcode of query */
97 const char *dname; /* domain name */
98 int class, type; /* class and type of query */
99 const u_char *data; /* resource record data */
100 int datalen; /* length of data */
101 const u_char *newrr_in; /* new rr for modify or append */
102 u_char *buf; /* buffer to put query */
103 int buflen; /* size of buffer */
104 {
105 HEADER *hp;
106 u_char *cp;
107 int n;
108 u_char *dnptrs[20], **dpp, **lastdnptr;
109
110 if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
111 h_errno = NETDB_INTERNAL;
112 return (-1);
113 }
114 #ifdef DEBUG
115 if (_res.options & RES_DEBUG)
116 printf(";; res_mkquery(%d, %s, %d, %d)\n",
117 op, dname, class, type);
118 #endif
119 /*
120 * Initialize header fields.
121 */
122 if ((buf == NULL) || (buflen < HFIXEDSZ))
123 return (-1);
124 memset(buf, 0, HFIXEDSZ);
125 hp = (HEADER *) buf;
126 hp->id = htons(++_res.id);
127 hp->opcode = op;
128 hp->rd = (_res.options & RES_RECURSE) != 0;
129 hp->rcode = NOERROR;
130 cp = buf + HFIXEDSZ;
131 buflen -= HFIXEDSZ;
132 dpp = dnptrs;
133 *dpp++ = buf;
134 *dpp++ = NULL;
135 lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
136 /*
137 * perform opcode specific processing
138 */
139 switch (op) {
140 case QUERY: /*FALLTHROUGH*/
141 case NS_NOTIFY_OP:
142 if ((buflen -= QFIXEDSZ) < 0)
143 return (-1);
144 if ((n = dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0)
145 return (-1);
146 cp += n;
147 buflen -= n;
148 __putshort(type, cp);
149 cp += INT16SZ;
150 __putshort(class, cp);
151 cp += INT16SZ;
152 hp->qdcount = htons(1);
153 if (op == QUERY || data == NULL)
154 break;
155 /*
156 * Make an additional record for completion domain.
157 */
158 buflen -= RRFIXEDSZ;
159 n = dn_comp((char *)data, cp, buflen, dnptrs, lastdnptr);
160 if (n < 0)
161 return (-1);
162 cp += n;
163 buflen -= n;
164 __putshort(T_NULL, cp);
165 cp += INT16SZ;
166 __putshort(class, cp);
167 cp += INT16SZ;
168 __putlong(0, cp);
169 cp += INT32SZ;
170 __putshort(0, cp);
171 cp += INT16SZ;
172 hp->arcount = htons(1);
173 break;
174
175 case IQUERY:
176 /*
177 * Initialize answer section
178 */
179 if (buflen < 1 + RRFIXEDSZ + datalen)
180 return (-1);
181 *cp++ = '\0'; /* no domain name */
182 __putshort(type, cp);
183 cp += INT16SZ;
184 __putshort(class, cp);
185 cp += INT16SZ;
186 __putlong(0, cp);
187 cp += INT32SZ;
188 __putshort(datalen, cp);
189 cp += INT16SZ;
190 if (datalen) {
191 memcpy(cp, data, datalen);
192 cp += datalen;
193 }
194 hp->ancount = htons(1);
195 break;
196
197 default:
198 return (-1);
199 }
200 return (cp - buf);
201 }
202
203 /*
204 * Weak aliases for applications that use certain private entry points,
205 * and fail to include <resolv.h>.
206 */
207 #undef res_mkquery
208 __weak_reference(__res_mkquery, res_mkquery);
209
210 /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */
211 int
res_opt(n0,buf,buflen,anslen)212 res_opt(n0, buf, buflen, anslen)
213 int n0;
214 u_char *buf; /* buffer to put query */
215 int buflen; /* size of buffer */
216 int anslen; /* answer buffer length */
217 {
218 HEADER *hp;
219 u_char *cp;
220
221 hp = (HEADER *) buf;
222 cp = buf + n0;
223 buflen -= n0;
224
225 if (buflen < 1 + RRFIXEDSZ)
226 return -1;
227
228 *cp++ = 0; /* "." */
229 buflen--;
230
231 __putshort(T_OPT, cp); /* TYPE */
232 cp += INT16SZ;
233 __putshort(anslen & 0xffff, cp); /* CLASS = UDP payload size */
234 cp += INT16SZ;
235 *cp++ = NOERROR; /* extended RCODE */
236 *cp++ = 0; /* EDNS version */
237 __putshort(0, cp); /* MBZ */
238 cp += INT16SZ;
239 __putshort(0, cp); /* RDLEN */
240 cp += INT16SZ;
241 hp->arcount = htons(ntohs(hp->arcount) + 1);
242 buflen -= RRFIXEDSZ;
243
244 return cp - buf;
245 }
246