Annotation of src/lib/libc/resolv/res_mkquery.c, Revision 1.8
1.8 ! ghen 1: /* $NetBSD: res_mkquery.c,v 1.1.1.3 2007/03/30 20:16:22 ghen Exp $ */
1.1 christos 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:
1.3 christos 73: #include <sys/cdefs.h>
1.1 christos 74: #if defined(LIBC_SCCS) && !defined(lint)
1.3 christos 75: #ifdef notdef
1.1 christos 76: static const char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93";
1.7 christos 77: static const char rcsid[] = "Id: res_mkquery.c,v 1.5.18.1 2005/04/27 05:01:11 sra Exp";
1.3 christos 78: #else
1.8 ! ghen 79: __RCSID("$NetBSD: res_mkquery.c,v 1.7 2007/01/27 22:26:44 christos Exp $");
1.3 christos 80: #endif
1.1 christos 81: #endif /* LIBC_SCCS and not lint */
82:
83: #include "port_before.h"
1.4 christos 84:
85: #include "namespace.h"
1.1 christos 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:
1.5 christos 96: #if 0
1.4 christos 97: #ifdef __weak_alias
98: __weak_alias(res_nmkquery,_res_nmkquery)
99: __weak_alias(res_nopt,_res_nopt)
100: #endif
1.5 christos 101: #endif
1.4 christos 102:
1.1 christos 103: /* Options. Leave them on. */
1.6 christos 104: #ifndef DEBUG
1.1 christos 105: #define DEBUG
1.6 christos 106: #endif
1.1 christos 107:
108: extern const char *_res_opcodes[];
109:
1.7 christos 110: /*%
1.1 christos 111: * Form all types of queries.
112: * Returns the size of the result or -1.
113: */
114: int
115: res_nmkquery(res_state statp,
1.7 christos 116: int op, /*!< opcode of query */
117: const char *dname, /*!< domain name */
118: int class, int type, /*!< class and type of query */
119: const u_char *data, /*!< resource record data */
120: int datalen, /*!< length of data */
121: const u_char *newrr_in, /*!< new rr for modify or append */
122: u_char *buf, /*!< buffer to put query */
123: int buflen) /*!< size of buffer */
1.1 christos 124: {
125: register HEADER *hp;
126: register u_char *cp, *ep;
127: register int n;
128: u_char *dnptrs[20], **dpp, **lastdnptr;
129:
130: UNUSED(newrr_in);
131:
132: #ifdef DEBUG
133: if (statp->options & RES_DEBUG)
134: printf(";; res_nmkquery(%s, %s, %s, %s)\n",
135: _res_opcodes[op], dname, p_class(class), p_type(type));
136: #endif
137: /*
138: * Initialize header fields.
139: */
140: if ((buf == NULL) || (buflen < HFIXEDSZ))
141: return (-1);
142: memset(buf, 0, HFIXEDSZ);
1.2 christos 143: hp = (HEADER *)(void *)buf;
1.1 christos 144: hp->id = htons(++statp->id);
145: hp->opcode = op;
146: hp->rd = (statp->options & RES_RECURSE) != 0U;
147: hp->rcode = NOERROR;
148: cp = buf + HFIXEDSZ;
149: ep = buf + buflen;
150: dpp = dnptrs;
151: *dpp++ = buf;
152: *dpp++ = NULL;
153: lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
154: /*
155: * perform opcode specific processing
156: */
157: switch (op) {
158: case QUERY: /*FALLTHROUGH*/
159: case NS_NOTIFY_OP:
160: if (ep - cp < QFIXEDSZ)
161: return (-1);
162: if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs,
163: lastdnptr)) < 0)
164: return (-1);
165: cp += n;
166: ns_put16(type, cp);
167: cp += INT16SZ;
168: ns_put16(class, cp);
169: cp += INT16SZ;
170: hp->qdcount = htons(1);
171: if (op == QUERY || data == NULL)
172: break;
173: /*
174: * Make an additional record for completion domain.
175: */
176: if ((ep - cp) < RRFIXEDSZ)
177: return (-1);
178: n = dn_comp((const char *)data, cp, ep - cp - RRFIXEDSZ,
179: dnptrs, lastdnptr);
180: if (n < 0)
181: return (-1);
182: cp += n;
183: ns_put16(T_NULL, cp);
184: cp += INT16SZ;
185: ns_put16(class, cp);
186: cp += INT16SZ;
187: ns_put32(0, cp);
188: cp += INT32SZ;
189: ns_put16(0, cp);
190: cp += INT16SZ;
191: hp->arcount = htons(1);
192: break;
193:
194: case IQUERY:
195: /*
196: * Initialize answer section
197: */
198: if (ep - cp < 1 + RRFIXEDSZ + datalen)
199: return (-1);
1.7 christos 200: *cp++ = '\0'; /*%< no domain name */
1.1 christos 201: ns_put16(type, cp);
202: cp += INT16SZ;
203: ns_put16(class, cp);
204: cp += INT16SZ;
205: ns_put32(0, cp);
206: cp += INT32SZ;
207: ns_put16(datalen, cp);
208: cp += INT16SZ;
209: if (datalen) {
1.2 christos 210: memcpy(cp, data, (size_t)datalen);
1.1 christos 211: cp += datalen;
212: }
213: hp->ancount = htons(1);
214: break;
215:
216: default:
217: return (-1);
218: }
219: return (cp - buf);
220: }
221:
222: #ifdef RES_USE_EDNS0
223: /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */
224: #ifndef T_OPT
225: #define T_OPT 41
226: #endif
227:
228: int
229: res_nopt(res_state statp,
1.7 christos 230: int n0, /*%< current offset in buffer */
231: u_char *buf, /*%< buffer to put query */
232: int buflen, /*%< size of buffer */
233: int anslen) /*%< UDP answer buffer size */
1.1 christos 234: {
235: register HEADER *hp;
236: register u_char *cp, *ep;
237: u_int16_t flags = 0;
238:
239: #ifdef DEBUG
240: if ((statp->options & RES_DEBUG) != 0U)
241: printf(";; res_nopt()\n");
242: #endif
243:
1.2 christos 244: hp = (HEADER *)(void *)buf;
1.1 christos 245: cp = buf + n0;
246: ep = buf + buflen;
247:
248: if ((ep - cp) < 1 + RRFIXEDSZ)
249: return (-1);
250:
1.7 christos 251: *cp++ = 0; /*%< "." */
252: ns_put16(T_OPT, cp); /*%< TYPE */
1.1 christos 253: cp += INT16SZ;
1.7 christos 254: ns_put16(anslen & 0xffff, cp); /*%< CLASS = UDP payload size */
1.1 christos 255: cp += INT16SZ;
1.7 christos 256: *cp++ = NOERROR; /*%< extended RCODE */
257: *cp++ = 0; /*%< EDNS version */
1.1 christos 258: if (statp->options & RES_USE_DNSSEC) {
259: #ifdef DEBUG
260: if (statp->options & RES_DEBUG)
261: printf(";; res_opt()... ENDS0 DNSSEC\n");
262: #endif
263: flags |= NS_OPT_DNSSEC_OK;
264: }
265: ns_put16(flags, cp);
266: cp += INT16SZ;
1.7 christos 267: ns_put16(0, cp); /*%< RDLEN */
1.1 christos 268: cp += INT16SZ;
269: hp->arcount = htons(ntohs(hp->arcount) + 1);
270:
271: return (cp - buf);
272: }
273: #endif
1.7 christos 274:
275: /*! \file */
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