Annotation of embedaddon/dhcp/minires/res_mkquery.c, revision 1.1.1.1
1.1 misho 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) 2004,2009 by Internet Systems Consortium, Inc. ("ISC")
56: * Portions Copyright (c) 1996-2003 by Internet Software Consortium
57: *
58: * Permission to use, copy, modify, and distribute this software for any
59: * purpose with or without fee is hereby granted, provided that the above
60: * copyright notice and this permission notice appear in all copies.
61: *
62: * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
63: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
64: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
65: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
66: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
67: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
68: * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
69: *
70: * Internet Systems Consortium, Inc.
71: * 950 Charter Street
72: * Redwood City, CA 94063
73: * <info@isc.org>
74: * https://www.isc.org/
75: */
76:
77: #if defined(LIBC_SCCS) && !defined(lint)
78: static const char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93";
1.1.1.1 ! misho 79: static const char rcsid[] = "$Id: res_mkquery.c,v 1.6.344.2 2009/07/24 22:04:52 sar Exp $";
1.1 misho 80: #endif /* LIBC_SCCS and not lint */
81:
82: #include <sys/types.h>
83: #include <sys/param.h>
84:
85: #include <netinet/in.h>
86: #include <arpa/inet.h>
87: #include <sys/socket.h>
88:
89: #include <netdb.h>
90: #include <stdio.h>
91: #include <string.h>
92:
93: #include "minires/minires.h"
94: #include "arpa/nameser.h"
95:
96: extern const char *_res_opcodes[];
97:
98: /*
99: * Form all types of queries.
100: * Returns the size of the result or -1.
101: */
102: isc_result_t
103: res_nmkquery(res_state statp,
104: int op, /* opcode of query */
105: const char *dname, /* domain name */
106: ns_class class, ns_type type, /* class and type of query */
107: const u_char *data, /* resource record data */
108: unsigned datalen, /* length of data */
109: const u_char *newrr_in, /* new rr for modify or append */
110: double *buf, /* buffer to put query */
111: unsigned buflen, /* size of buffer */
112: unsigned *rbuflen) /* returned size of buffer */
113: {
114: register HEADER *hp;
115: register u_char *cp;
116: register int n;
117: u_char *dnptrs[20], **dpp, **lastdnptr;
118:
119: /*
120: * Initialize header fields.
121: */
122: if ((buf == NULL) || (buflen < HFIXEDSZ))
123: return ISC_R_INVALIDARG;
124: memset(buf, 0, HFIXEDSZ);
125: hp = (HEADER *) buf;
126: hp->id = htons(++statp->id);
127: hp->opcode = op;
128: hp->rd = (statp->options & RES_RECURSE) != 0;
129: hp->rcode = NOERROR;
130: cp = ((u_char *)buf) + HFIXEDSZ;
131: buflen -= HFIXEDSZ;
132: dpp = dnptrs;
133: *dpp++ = (u_char *)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 ISC_R_NOSPACE;
144: if ((n = dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0)
145: return ISC_R_NOSPACE;
146: cp += n;
147: buflen -= n;
148: putUShort(cp, type);
149: cp += INT16SZ;
150: putUShort(cp, class);
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((const char *)data, cp, buflen, dnptrs, lastdnptr);
160: if (n < 0)
161: return ISC_R_NOSPACE;
162: cp += n;
163: buflen -= n;
164: putUShort(cp, T_NULL);
165: cp += INT16SZ;
166: putUShort(cp, class);
167: cp += INT16SZ;
168: putULong(cp, 0);
169: cp += INT32SZ;
170: putUShort(cp, 0);
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 ISC_R_NOSPACE;
181: *cp++ = '\0'; /* no domain name */
182: putUShort(cp, type);
183: cp += INT16SZ;
184: putUShort(cp, class);
185: cp += INT16SZ;
186: putULong(cp, 0);
187: cp += INT32SZ;
188: putUShort(cp, datalen);
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 ISC_R_NOTIMPLEMENTED;
199: }
200: *rbuflen = cp - ((u_char *)buf);
201: return ISC_R_SUCCESS;
202: }
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