Annotation of src/lib/libc/resolv/res_mkquery.c, Revision 1.12.8.1
1.12.8.1! snj 1: /* $NetBSD: res_mkquery.c,v 1.12 2009/04/12 19:43:37 christos Exp $ */
1.11 christos 2:
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: */
1.1 christos 19:
20: /*
21: * Copyright (c) 1985, 1993
22: * The Regents of the University of California. All rights reserved.
1.11 christos 23: *
1.1 christos 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. All advertising materials mentioning features or use of this software
33: * must display the following acknowledgement:
34: * This product includes software developed by the University of
35: * California, Berkeley and its contributors.
36: * 4. Neither the name of the University nor the names of its contributors
37: * may be used to endorse or promote products derived from this software
38: * without specific prior written permission.
1.11 christos 39: *
1.1 christos 40: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
41: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
44: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50: * SUCH DAMAGE.
51: */
52:
53: /*
54: * Portions Copyright (c) 1993 by Digital Equipment Corporation.
1.11 christos 55: *
1.1 christos 56: * Permission to use, copy, modify, and distribute this software for any
57: * purpose with or without fee is hereby granted, provided that the above
58: * copyright notice and this permission notice appear in all copies, and that
59: * the name of Digital Equipment Corporation not be used in advertising or
60: * publicity pertaining to distribution of the document or software without
61: * specific, written prior permission.
1.11 christos 62: *
1.1 christos 63: * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
64: * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
65: * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
66: * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
67: * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
68: * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
69: * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
70: * 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";
1.11 christos 77: static const char rcsid[] = "Id: res_mkquery.c,v 1.10 2008/12/11 09:59:00 marka Exp";
1.3 christos 78: #else
1.12.8.1! snj 79: __RCSID("$NetBSD: res_mkquery.c,v 1.12 2009/04/12 19:43:37 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. */
1.10 christos 104: #ifndef DEBUG
1.1 christos 105: #define DEBUG
1.10 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;
1.11 christos 144: statp->id = res_nrandomid(statp);
145: hp->id = htons(statp->id);
1.1 christos 146: hp->opcode = op;
147: hp->rd = (statp->options & RES_RECURSE) != 0U;
148: hp->rcode = NOERROR;
149: cp = buf + HFIXEDSZ;
150: ep = buf + buflen;
151: dpp = dnptrs;
152: *dpp++ = buf;
153: *dpp++ = NULL;
154: lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
155: /*
156: * perform opcode specific processing
157: */
158: switch (op) {
159: case QUERY: /*FALLTHROUGH*/
160: case NS_NOTIFY_OP:
161: if (ep - cp < QFIXEDSZ)
162: return (-1);
163: if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs,
164: lastdnptr)) < 0)
165: return (-1);
166: cp += n;
167: ns_put16(type, cp);
168: cp += INT16SZ;
169: ns_put16(class, cp);
170: cp += INT16SZ;
171: hp->qdcount = htons(1);
172: if (op == QUERY || data == NULL)
173: break;
174: /*
175: * Make an additional record for completion domain.
176: */
177: if ((ep - cp) < RRFIXEDSZ)
178: return (-1);
179: n = dn_comp((const char *)data, cp, ep - cp - RRFIXEDSZ,
180: dnptrs, lastdnptr);
181: if (n < 0)
182: return (-1);
183: cp += n;
184: ns_put16(T_NULL, cp);
185: cp += INT16SZ;
186: ns_put16(class, cp);
187: cp += INT16SZ;
188: ns_put32(0, cp);
189: cp += INT32SZ;
190: ns_put16(0, cp);
191: cp += INT16SZ;
192: hp->arcount = htons(1);
193: break;
194:
195: case IQUERY:
196: /*
197: * Initialize answer section
198: */
199: if (ep - cp < 1 + RRFIXEDSZ + datalen)
200: return (-1);
1.7 christos 201: *cp++ = '\0'; /*%< no domain name */
1.1 christos 202: ns_put16(type, cp);
203: cp += INT16SZ;
204: ns_put16(class, cp);
205: cp += INT16SZ;
206: ns_put32(0, cp);
207: cp += INT32SZ;
208: ns_put16(datalen, cp);
209: cp += INT16SZ;
210: if (datalen) {
1.2 christos 211: memcpy(cp, data, (size_t)datalen);
1.1 christos 212: cp += datalen;
213: }
214: hp->ancount = htons(1);
215: break;
216:
217: default:
218: return (-1);
219: }
220: return (cp - buf);
221: }
222:
223: #ifdef RES_USE_EDNS0
224: /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */
225:
226: int
227: res_nopt(res_state statp,
1.7 christos 228: int n0, /*%< current offset in buffer */
229: u_char *buf, /*%< buffer to put query */
230: int buflen, /*%< size of buffer */
231: int anslen) /*%< UDP answer buffer size */
1.1 christos 232: {
233: register HEADER *hp;
234: register u_char *cp, *ep;
235: u_int16_t flags = 0;
236:
237: #ifdef DEBUG
238: if ((statp->options & RES_DEBUG) != 0U)
239: printf(";; res_nopt()\n");
240: #endif
241:
1.2 christos 242: hp = (HEADER *)(void *)buf;
1.1 christos 243: cp = buf + n0;
244: ep = buf + buflen;
245:
246: if ((ep - cp) < 1 + RRFIXEDSZ)
247: return (-1);
248:
1.11 christos 249: *cp++ = 0; /*%< "." */
250: ns_put16(ns_t_opt, cp); /*%< TYPE */
1.1 christos 251: cp += INT16SZ;
1.12.8.1! snj 252: if (anslen > 0xffff)
! 253: anslen = 0xffff;
! 254: ns_put16(anslen, cp); /*%< CLASS = UDP payload size */
1.1 christos 255: cp += INT16SZ;
1.11 christos 256: *cp++ = NOERROR; /*%< extended RCODE */
257: *cp++ = 0; /*%< EDNS version */
1.9 christos 258:
1.1 christos 259: if (statp->options & RES_USE_DNSSEC) {
260: #ifdef DEBUG
261: if (statp->options & RES_DEBUG)
262: printf(";; res_opt()... ENDS0 DNSSEC\n");
263: #endif
264: flags |= NS_OPT_DNSSEC_OK;
265: }
266: ns_put16(flags, cp);
267: cp += INT16SZ;
1.9 christos 268:
1.11 christos 269: ns_put16(0U, cp); /*%< RDLEN */
1.1 christos 270: cp += INT16SZ;
1.9 christos 271:
1.1 christos 272: hp->arcount = htons(ntohs(hp->arcount) + 1);
273:
274: return (cp - buf);
275: }
1.9 christos 276:
277: /*
278: * Construct variable data (RDATA) block for OPT psuedo-RR, append it
279: * to the buffer, then update the RDLEN field (previously set to zero by
280: * res_nopt()) with the new RDATA length.
281: */
282: int
283: res_nopt_rdata(res_state statp,
284: int n0, /*%< current offset in buffer */
285: u_char *buf, /*%< buffer to put query */
286: int buflen, /*%< size of buffer */
287: u_char *rdata, /*%< ptr to start of opt rdata */
288: u_short code, /*%< OPTION-CODE */
289: u_short len, /*%< OPTION-LENGTH */
290: u_char *data) /*%< OPTION_DATA */
291: {
292: register u_char *cp, *ep;
293:
294: #ifdef DEBUG
295: if ((statp->options & RES_DEBUG) != 0U)
296: printf(";; res_nopt_rdata()\n");
297: #endif
298:
299: cp = buf + n0;
300: ep = buf + buflen;
301:
302: if ((ep - cp) < (4 + len))
303: return (-1);
304:
305: if (rdata < (buf + 2) || rdata >= ep)
306: return (-1);
307:
308: ns_put16(code, cp);
309: cp += INT16SZ;
310:
311: ns_put16(len, cp);
312: cp += INT16SZ;
313:
1.12 christos 314: memcpy(cp, data, (size_t)len);
1.9 christos 315: cp += len;
316:
317: len = cp - rdata;
318: ns_put16(len, rdata - 2); /* Update RDLEN field */
319:
320: return (cp - buf);
321: }
1.1 christos 322: #endif
1.7 christos 323:
324: /*! \file */
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