759 lines
19 KiB
C
759 lines
19 KiB
C
/*
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* ++Copyright++ 1985, 1988, 1993
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* -
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* Copyright (c) 1985, 1988, 1993
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* The Regents of the University of California. 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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* 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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* Portions Copyright (c) 1993 by Digital Equipment Corporation.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies, and that
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* the name of Digital Equipment Corporation not be used in advertising or
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* publicity pertaining to distribution of the document or software without
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* specific, written prior permission.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
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* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
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* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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* -
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* --Copyright--
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93";
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static char fromrcsid[] = "From: Id: gethnamaddr.c,v 8.23 1998/04/07 04:59:46 vixie Exp $";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <arpa/nameser.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <netdb.h>
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#include <resolv.h>
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#include <ctype.h>
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#include <errno.h>
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#include <syslog.h>
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#include <stdarg.h>
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#include <nsswitch.h>
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#include "netdb_private.h"
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#include "res_config.h"
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#define SPRINTF(x) ((size_t)sprintf x)
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static const char AskedForGot[] =
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"gethostby*.gethostanswer: asked for \"%s\", got \"%s\"";
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#ifdef RESOLVSORT
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static void addrsort(char **, int, res_state);
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#endif
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#ifdef DEBUG
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static void dprintf(char *, int, res_state) __printflike(1, 0);
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#endif
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#define MAXPACKET (64*1024)
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typedef union {
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HEADER hdr;
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u_char buf[MAXPACKET];
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} querybuf;
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typedef union {
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int32_t al;
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char ac;
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} align;
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int _dns_ttl_;
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#ifdef DEBUG
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static void
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dprintf(msg, num, res)
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char *msg;
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int num;
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res_state res;
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{
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if (res->options & RES_DEBUG) {
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int save = errno;
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printf(msg, num);
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errno = save;
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}
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}
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#else
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# define dprintf(msg, num, res) /*nada*/
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#endif
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#define BOUNDED_INCR(x) \
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do { \
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cp += x; \
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if (cp > eom) { \
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RES_SET_H_ERRNO(statp, NO_RECOVERY); \
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return (-1); \
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} \
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} while (0)
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#define BOUNDS_CHECK(ptr, count) \
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do { \
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if ((ptr) + (count) > eom) { \
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RES_SET_H_ERRNO(statp, NO_RECOVERY); \
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return (-1); \
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} \
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} while (0)
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static int
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gethostanswer(const querybuf *answer, int anslen, const char *qname, int qtype,
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struct hostent *he, struct hostent_data *hed, res_state statp)
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{
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const HEADER *hp;
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const u_char *cp;
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int n;
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const u_char *eom, *erdata;
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char *bp, *ep, **ap, **hap;
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int type, class, ancount, qdcount;
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int haveanswer, had_error;
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int toobig = 0;
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char tbuf[MAXDNAME];
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const char *tname;
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int (*name_ok)(const char *);
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tname = qname;
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he->h_name = NULL;
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eom = answer->buf + anslen;
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switch (qtype) {
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case T_A:
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case T_AAAA:
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name_ok = res_hnok;
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break;
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case T_PTR:
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name_ok = res_dnok;
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break;
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default:
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RES_SET_H_ERRNO(statp, NO_RECOVERY);
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return (-1); /* XXX should be abort(); */
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}
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/*
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* find first satisfactory answer
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*/
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hp = &answer->hdr;
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ancount = ntohs(hp->ancount);
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qdcount = ntohs(hp->qdcount);
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bp = hed->hostbuf;
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ep = hed->hostbuf + sizeof hed->hostbuf;
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cp = answer->buf;
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BOUNDED_INCR(HFIXEDSZ);
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if (qdcount != 1) {
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RES_SET_H_ERRNO(statp, NO_RECOVERY);
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return (-1);
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}
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n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
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if ((n < 0) || !(*name_ok)(bp)) {
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RES_SET_H_ERRNO(statp, NO_RECOVERY);
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return (-1);
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}
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BOUNDED_INCR(n + QFIXEDSZ);
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if (qtype == T_A || qtype == T_AAAA) {
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/* res_send() has already verified that the query name is the
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* same as the one we sent; this just gets the expanded name
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* (i.e., with the succeeding search-domain tacked on).
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*/
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n = strlen(bp) + 1; /* for the \0 */
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if (n >= MAXHOSTNAMELEN) {
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RES_SET_H_ERRNO(statp, NO_RECOVERY);
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return (-1);
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}
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he->h_name = bp;
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bp += n;
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/* The qname can be abbreviated, but h_name is now absolute. */
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qname = he->h_name;
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}
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ap = hed->host_aliases;
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*ap = NULL;
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he->h_aliases = hed->host_aliases;
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hap = hed->h_addr_ptrs;
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*hap = NULL;
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he->h_addr_list = hed->h_addr_ptrs;
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haveanswer = 0;
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had_error = 0;
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_dns_ttl_ = -1;
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while (ancount-- > 0 && cp < eom && !had_error) {
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n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
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if ((n < 0) || !(*name_ok)(bp)) {
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had_error++;
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continue;
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}
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cp += n; /* name */
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BOUNDS_CHECK(cp, 3 * INT16SZ + INT32SZ);
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type = _getshort(cp);
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cp += INT16SZ; /* type */
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class = _getshort(cp);
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cp += INT16SZ; /* class */
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if (qtype == T_A && type == T_A)
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_dns_ttl_ = _getlong(cp);
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cp += INT32SZ; /* TTL */
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n = _getshort(cp);
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cp += INT16SZ; /* len */
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BOUNDS_CHECK(cp, n);
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erdata = cp + n;
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if (class != C_IN) {
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/* XXX - debug? syslog? */
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cp += n;
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continue; /* XXX - had_error++ ? */
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}
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if ((qtype == T_A || qtype == T_AAAA) && type == T_CNAME) {
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if (ap >= &hed->host_aliases[_MAXALIASES-1])
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continue;
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n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
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if ((n < 0) || !(*name_ok)(tbuf)) {
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had_error++;
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continue;
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}
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cp += n;
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if (cp != erdata) {
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RES_SET_H_ERRNO(statp, NO_RECOVERY);
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return (-1);
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}
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/* Store alias. */
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*ap++ = bp;
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n = strlen(bp) + 1; /* for the \0 */
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if (n >= MAXHOSTNAMELEN) {
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had_error++;
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continue;
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}
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bp += n;
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/* Get canonical name. */
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n = strlen(tbuf) + 1; /* for the \0 */
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if (n > ep - bp || n >= MAXHOSTNAMELEN) {
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had_error++;
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continue;
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}
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strcpy(bp, tbuf);
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he->h_name = bp;
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bp += n;
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continue;
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}
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if (qtype == T_PTR && type == T_CNAME) {
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n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
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if (n < 0 || !res_dnok(tbuf)) {
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had_error++;
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continue;
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}
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cp += n;
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if (cp != erdata) {
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RES_SET_H_ERRNO(statp, NO_RECOVERY);
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return (-1);
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}
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/* Get canonical name. */
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n = strlen(tbuf) + 1; /* for the \0 */
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if (n > ep - bp || n >= MAXHOSTNAMELEN) {
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had_error++;
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continue;
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}
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strcpy(bp, tbuf);
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tname = bp;
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bp += n;
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continue;
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}
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if (type != qtype) {
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if (type != T_SIG)
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syslog(LOG_NOTICE|LOG_AUTH,
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"gethostby*.gethostanswer: asked for \"%s %s %s\", got type \"%s\"",
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qname, p_class(C_IN), p_type(qtype),
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p_type(type));
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cp += n;
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continue; /* XXX - had_error++ ? */
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}
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switch (type) {
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case T_PTR:
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if (strcasecmp(tname, bp) != 0) {
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syslog(LOG_NOTICE|LOG_AUTH,
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AskedForGot, qname, bp);
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cp += n;
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continue; /* XXX - had_error++ ? */
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}
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n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
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if ((n < 0) || !res_hnok(bp)) {
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had_error++;
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break;
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}
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#if MULTI_PTRS_ARE_ALIASES
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cp += n;
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if (cp != erdata) {
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RES_SET_H_ERRNO(statp, NO_RECOVERY);
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return (-1);
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}
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if (!haveanswer)
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he->h_name = bp;
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else if (ap < &hed->host_aliases[_MAXALIASES-1])
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*ap++ = bp;
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else
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n = -1;
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if (n != -1) {
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n = strlen(bp) + 1; /* for the \0 */
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if (n >= MAXHOSTNAMELEN) {
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had_error++;
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break;
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}
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bp += n;
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}
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break;
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#else
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he->h_name = bp;
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if (statp->options & RES_USE_INET6) {
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n = strlen(bp) + 1; /* for the \0 */
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if (n >= MAXHOSTNAMELEN) {
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had_error++;
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break;
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}
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bp += n;
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_map_v4v6_hostent(he, &bp, ep);
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}
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RES_SET_H_ERRNO(statp, NETDB_SUCCESS);
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return (0);
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#endif
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case T_A:
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case T_AAAA:
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if (strcasecmp(he->h_name, bp) != 0) {
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syslog(LOG_NOTICE|LOG_AUTH,
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AskedForGot, he->h_name, bp);
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cp += n;
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continue; /* XXX - had_error++ ? */
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}
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if (n != he->h_length) {
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cp += n;
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continue;
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}
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if (!haveanswer) {
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int nn;
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he->h_name = bp;
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nn = strlen(bp) + 1; /* for the \0 */
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bp += nn;
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}
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bp += sizeof(align) - ((u_long)bp % sizeof(align));
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if (bp + n >= ep) {
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dprintf("size (%d) too big\n", n, statp);
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had_error++;
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continue;
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}
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if (hap >= &hed->h_addr_ptrs[_MAXADDRS-1]) {
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if (!toobig++)
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dprintf("Too many addresses (%d)\n",
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_MAXADDRS, statp);
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cp += n;
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continue;
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}
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memcpy(*hap++ = bp, cp, n);
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bp += n;
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cp += n;
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if (cp != erdata) {
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RES_SET_H_ERRNO(statp, NO_RECOVERY);
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return (-1);
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}
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break;
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default:
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dprintf("Impossible condition (type=%d)\n", type,
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statp);
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RES_SET_H_ERRNO(statp, NO_RECOVERY);
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return (-1);
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/* BIND has abort() here, too risky on bad data */
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}
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if (!had_error)
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haveanswer++;
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}
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if (haveanswer) {
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*ap = NULL;
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*hap = NULL;
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# if defined(RESOLVSORT)
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/*
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* Note: we sort even if host can take only one address
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* in its return structures - should give it the "best"
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* address in that case, not some random one
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*/
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if (statp->nsort && haveanswer > 1 && qtype == T_A)
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addrsort(hed->h_addr_ptrs, haveanswer, statp);
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# endif /*RESOLVSORT*/
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if (!he->h_name) {
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n = strlen(qname) + 1; /* for the \0 */
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if (n > ep - bp || n >= MAXHOSTNAMELEN)
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goto no_recovery;
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strcpy(bp, qname);
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he->h_name = bp;
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bp += n;
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}
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if (statp->options & RES_USE_INET6)
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_map_v4v6_hostent(he, &bp, ep);
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RES_SET_H_ERRNO(statp, NETDB_SUCCESS);
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return (0);
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}
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no_recovery:
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RES_SET_H_ERRNO(statp, NO_RECOVERY);
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return (-1);
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}
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/* XXX: for async DNS resolver in ypserv */
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struct hostent *
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__dns_getanswer(const char *answer, int anslen, const char *qname, int qtype)
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{
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struct hostent *he;
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struct hostent_data *hed;
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int error;
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res_state statp;
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statp = __res_state();
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if ((he = __hostent_init()) == NULL ||
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(hed = __hostent_data_init()) == NULL) {
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RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
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return (NULL);
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}
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switch (qtype) {
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case T_AAAA:
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he->h_addrtype = AF_INET6;
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he->h_length = NS_IN6ADDRSZ;
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break;
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case T_A:
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default:
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he->h_addrtype = AF_INET;
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he->h_length = NS_INADDRSZ;
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break;
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}
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error = gethostanswer((const querybuf *)answer, anslen, qname, qtype,
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he, hed, statp);
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return (error == 0) ? he : NULL;
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}
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int
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_dns_gethostbyname(void *rval, void *cb_data, va_list ap)
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{
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const char *name;
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int af;
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char *buffer;
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size_t buflen;
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int *errnop, *h_errnop;
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struct hostent *hptr, he;
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struct hostent_data *hed;
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querybuf *buf;
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int n, type, error;
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res_state statp;
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name = va_arg(ap, const char *);
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af = va_arg(ap, int);
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hptr = va_arg(ap, struct hostent *);
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buffer = va_arg(ap, char *);
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buflen = va_arg(ap, size_t);
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errnop = va_arg(ap, int *);
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h_errnop = va_arg(ap, int *);
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*((struct hostent **)rval) = NULL;
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statp = __res_state();
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if ((hed = __hostent_data_init()) == NULL) {
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RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
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*h_errnop = statp->res_h_errno;
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return (NS_NOTFOUND);
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}
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he.h_addrtype = af;
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switch (af) {
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case AF_INET:
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he.h_length = NS_INADDRSZ;
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type = T_A;
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break;
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case AF_INET6:
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he.h_length = NS_IN6ADDRSZ;
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type = T_AAAA;
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break;
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default:
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RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
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*h_errnop = statp->res_h_errno;
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|
errno = EAFNOSUPPORT;
|
|
return (NS_UNAVAIL);
|
|
}
|
|
|
|
if ((buf = malloc(sizeof(*buf))) == NULL) {
|
|
RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
|
|
*h_errnop = statp->res_h_errno;
|
|
return (NS_NOTFOUND);
|
|
}
|
|
n = res_nsearch(statp, name, C_IN, type, buf->buf, sizeof(buf->buf));
|
|
if (n < 0) {
|
|
free(buf);
|
|
dprintf("res_nsearch failed (%d)\n", n, statp);
|
|
*h_errnop = statp->res_h_errno;
|
|
return (0);
|
|
} else if (n > sizeof(buf->buf)) {
|
|
free(buf);
|
|
dprintf("static buffer is too small (%d)\n", n, statp);
|
|
*h_errnop = statp->res_h_errno;
|
|
return (0);
|
|
}
|
|
error = gethostanswer(buf, n, name, type, &he, hed, statp);
|
|
free(buf);
|
|
if (error != 0) {
|
|
*h_errnop = statp->res_h_errno;
|
|
return (NS_NOTFOUND);
|
|
}
|
|
if (__copy_hostent(&he, hptr, buffer, buflen) != 0) {
|
|
*h_errnop = statp->res_h_errno;
|
|
return (NS_NOTFOUND);
|
|
}
|
|
*((struct hostent **)rval) = hptr;
|
|
return (NS_SUCCESS);
|
|
}
|
|
|
|
int
|
|
_dns_gethostbyaddr(void *rval, void *cb_data, va_list ap)
|
|
{
|
|
const void *addr;
|
|
socklen_t len;
|
|
int af;
|
|
char *buffer;
|
|
size_t buflen;
|
|
int *errnop, *h_errnop;
|
|
const u_char *uaddr;
|
|
struct hostent *hptr, he;
|
|
struct hostent_data *hed;
|
|
int n;
|
|
querybuf *buf;
|
|
char qbuf[MAXDNAME+1], *qp;
|
|
res_state statp;
|
|
#ifdef SUNSECURITY
|
|
struct hostdata rhd;
|
|
struct hostent *rhe;
|
|
char **haddr;
|
|
u_long old_options;
|
|
char hname2[MAXDNAME+1], numaddr[46];
|
|
int ret_h_error;
|
|
#endif /*SUNSECURITY*/
|
|
|
|
addr = va_arg(ap, const void *);
|
|
len = va_arg(ap, socklen_t);
|
|
af = va_arg(ap, int);
|
|
hptr = va_arg(ap, struct hostent *);
|
|
buffer = va_arg(ap, char *);
|
|
buflen = va_arg(ap, size_t);
|
|
errnop = va_arg(ap, int *);
|
|
h_errnop = va_arg(ap, int *);
|
|
uaddr = (const u_char *)addr;
|
|
|
|
*((struct hostent **)rval) = NULL;
|
|
|
|
statp = __res_state();
|
|
if ((hed = __hostent_data_init()) == NULL) {
|
|
RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
|
|
*h_errnop = statp->res_h_errno;
|
|
return (NS_NOTFOUND);
|
|
}
|
|
|
|
switch (af) {
|
|
case AF_INET:
|
|
(void) sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa",
|
|
(uaddr[3] & 0xff),
|
|
(uaddr[2] & 0xff),
|
|
(uaddr[1] & 0xff),
|
|
(uaddr[0] & 0xff));
|
|
break;
|
|
case AF_INET6:
|
|
qp = qbuf;
|
|
for (n = NS_IN6ADDRSZ - 1; n >= 0; n--) {
|
|
qp += SPRINTF((qp, "%x.%x.",
|
|
uaddr[n] & 0xf,
|
|
(uaddr[n] >> 4) & 0xf));
|
|
}
|
|
strlcat(qbuf, "ip6.arpa", sizeof(qbuf));
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
if ((buf = malloc(sizeof(*buf))) == NULL) {
|
|
RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
|
|
*h_errnop = statp->res_h_errno;
|
|
return NS_NOTFOUND;
|
|
}
|
|
n = res_nquery(statp, qbuf, C_IN, T_PTR, (u_char *)buf->buf,
|
|
sizeof buf->buf);
|
|
if (n < 0) {
|
|
free(buf);
|
|
dprintf("res_nquery failed (%d)\n", n, statp);
|
|
*h_errnop = statp->res_h_errno;
|
|
return (NS_UNAVAIL);
|
|
}
|
|
if (n > sizeof buf->buf) {
|
|
free(buf);
|
|
dprintf("static buffer is too small (%d)\n", n, statp);
|
|
*h_errnop = statp->res_h_errno;
|
|
return (NS_UNAVAIL);
|
|
}
|
|
if (gethostanswer(buf, n, qbuf, T_PTR, &he, hed, statp) != 0) {
|
|
free(buf);
|
|
*h_errnop = statp->res_h_errno;
|
|
return (NS_NOTFOUND); /* h_errno was set by gethostanswer() */
|
|
}
|
|
free(buf);
|
|
#ifdef SUNSECURITY
|
|
if (af == AF_INET) {
|
|
/*
|
|
* turn off search as the name should be absolute,
|
|
* 'localhost' should be matched by defnames
|
|
*/
|
|
strncpy(hname2, he.h_name, MAXDNAME);
|
|
hname2[MAXDNAME] = '\0';
|
|
old_options = statp->options;
|
|
statp->options &= ~RES_DNSRCH;
|
|
statp->options |= RES_DEFNAMES;
|
|
memset(&rhd, 0, sizeof rhd);
|
|
rhe = gethostbyname_r(hname2, &rhd.host, &rhd.data,
|
|
sizeof(rhd.data), &ret_h_error);
|
|
if (rhe == NULL) {
|
|
if (inet_ntop(af, addr, numaddr, sizeof(numaddr)) == NULL)
|
|
strlcpy(numaddr, "UNKNOWN", sizeof(numaddr));
|
|
syslog(LOG_NOTICE|LOG_AUTH,
|
|
"gethostbyaddr: No A record for %s (verifying [%s])",
|
|
hname2, numaddr);
|
|
statp->options = old_options;
|
|
RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
|
|
*h_errnop = statp->res_h_errno;
|
|
return (NS_NOTFOUND);
|
|
}
|
|
statp->options = old_options;
|
|
for (haddr = rhe->h_addr_list; *haddr; haddr++)
|
|
if (!memcmp(*haddr, addr, NS_INADDRSZ))
|
|
break;
|
|
if (!*haddr) {
|
|
if (inet_ntop(af, addr, numaddr, sizeof(numaddr)) == NULL)
|
|
strlcpy(numaddr, "UNKNOWN", sizeof(numaddr));
|
|
syslog(LOG_NOTICE|LOG_AUTH,
|
|
"gethostbyaddr: A record of %s != PTR record [%s]",
|
|
hname2, numaddr);
|
|
RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
|
|
*h_errnop = statp->res_h_errno;
|
|
return (NS_NOTFOUND);
|
|
}
|
|
}
|
|
#endif /*SUNSECURITY*/
|
|
he.h_addrtype = af;
|
|
he.h_length = len;
|
|
memcpy(hed->host_addr, uaddr, len);
|
|
hed->h_addr_ptrs[0] = (char *)hed->host_addr;
|
|
hed->h_addr_ptrs[1] = NULL;
|
|
if (af == AF_INET && (statp->options & RES_USE_INET6)) {
|
|
_map_v4v6_address((char*)hed->host_addr, (char*)hed->host_addr);
|
|
he.h_addrtype = AF_INET6;
|
|
he.h_length = NS_IN6ADDRSZ;
|
|
}
|
|
RES_SET_H_ERRNO(statp, NETDB_SUCCESS);
|
|
if (__copy_hostent(&he, hptr, buffer, buflen) != 0) {
|
|
*h_errnop = statp->res_h_errno;
|
|
return (NS_NOTFOUND);
|
|
}
|
|
*((struct hostent **)rval) = hptr;
|
|
return (NS_SUCCESS);
|
|
}
|
|
|
|
#ifdef RESOLVSORT
|
|
static void
|
|
addrsort(char **ap, int num, res_state res)
|
|
{
|
|
int i, j;
|
|
char **p;
|
|
short aval[_MAXADDRS];
|
|
int needsort = 0;
|
|
|
|
p = ap;
|
|
for (i = 0; i < num; i++, p++) {
|
|
for (j = 0 ; (unsigned)j < res->nsort; j++)
|
|
if (res->sort_list[j].addr.s_addr ==
|
|
(((struct in_addr *)(*p))->s_addr & res->sort_list[j].mask))
|
|
break;
|
|
aval[i] = j;
|
|
if (needsort == 0 && i > 0 && j < aval[i-1])
|
|
needsort = i;
|
|
}
|
|
if (!needsort)
|
|
return;
|
|
|
|
while (needsort < num) {
|
|
for (j = needsort - 1; j >= 0; j--) {
|
|
if (aval[j] > aval[j+1]) {
|
|
char *hp;
|
|
|
|
i = aval[j];
|
|
aval[j] = aval[j+1];
|
|
aval[j+1] = i;
|
|
|
|
hp = ap[j];
|
|
ap[j] = ap[j+1];
|
|
ap[j+1] = hp;
|
|
|
|
} else
|
|
break;
|
|
}
|
|
needsort++;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
void
|
|
_sethostdnsent(int stayopen)
|
|
{
|
|
res_state statp;
|
|
|
|
statp = __res_state();
|
|
if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1)
|
|
return;
|
|
if (stayopen)
|
|
statp->options |= RES_STAYOPEN | RES_USEVC;
|
|
}
|
|
|
|
void
|
|
_endhostdnsent()
|
|
{
|
|
res_state statp;
|
|
|
|
statp = __res_state();
|
|
statp->options &= ~(RES_STAYOPEN | RES_USEVC);
|
|
res_nclose(statp);
|
|
}
|