Annotation of embedaddon/dhcp/minires/res_mkquery.c, revision 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";
! 79: static const char rcsid[] = "$Id: res_mkquery.c,v 1.6.344.2 2009-07-24 22:04:52 sar Exp $";
! 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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