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97 lines
3 KiB
C
97 lines
3 KiB
C
/*
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* Copyright (c) 1985 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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/*static char *sccsid = "from: @(#)res_query.c 6.22 (Berkeley) 3/19/91";*/
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static char *rcsid = "$Id$";
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#endif /* LIBC_SCCS and not lint */
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#include <pthread.h>
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#include <resolv.h>
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#include <netdb.h>
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#include "res_internal.h"
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#if PACKETSZ > 1024
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#define MAXPACKET PACKETSZ
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#else
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#define MAXPACKET 1024
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#endif
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int res_query(char *name, int class, int type, unsigned char *answer,
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int anslen)
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{
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struct res_data *data;
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char buf[MAXPACKET];
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int result;
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HEADER *hp;
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data = _res_init();
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if (!data)
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return -1;
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/* Make the query. */
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result = res_mkquery(QUERY, name, class, type, NULL, 0, NULL, buf,
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sizeof(buf));
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if (result <= 0) {
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data->errval = NO_RECOVERY;
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return result;
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}
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result = res_send(buf, result, (char *) answer, anslen);
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if (result < 0) {
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data->errval = TRY_AGAIN;
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return result;
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}
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hp = (HEADER *) answer;
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if (hp->rcode == NOERROR && ntohs(hp->ancount) != 0)
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return result;
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/* Translate the error code and return. */
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switch(hp->rcode) {
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case NOERROR:
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data->errval = NO_DATA;
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break;
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case SERVFAIL:
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data->errval = TRY_AGAIN;
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break;
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case NXDOMAIN:
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data->errval = HOST_NOT_FOUND;
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break;
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default:
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data->errval = NO_RECOVERY;
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break;
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}
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return -1;
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}
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