1995-02-18 02:27:10 +01:00
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/*
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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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* 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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* 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 rcsid[] = "$Id$";
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#endif /* LIBC_SCCS and not lint */
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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 <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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#ifndef LOG_AUTH
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# define LOG_AUTH 0
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#endif
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#define MULTI_PTRS_ARE_ALIASES 1 /* XXX - experimental */
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#if defined(BSD) && (BSD >= 199103)
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# include <string.h>
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#else
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# include "../conf/portability.h"
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#endif
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#if defined(USE_OPTIONS_H)
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# include <../conf/options.h>
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#endif
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#define MAXALIASES 35
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#define MAXADDRS 35
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static const char AskedForGot[] =
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"gethostby*.getanswer: asked for \"%s\", got \"%s\"";
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static char *h_addr_ptrs[MAXADDRS + 1];
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1995-08-23 00:47:57 +02:00
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static struct hostent *gethostbyname_ipv4 __P((const char *));
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1995-02-18 02:27:10 +01:00
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static struct hostent host;
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static char *host_aliases[MAXALIASES];
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static char hostbuf[8*1024];
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static struct in_addr host_addr;
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static FILE *hostf = NULL;
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static int stayopen = 0;
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#ifdef RESOLVSORT
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static void addrsort __P((char **, int));
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#endif
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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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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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extern int h_errno;
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#ifdef DEBUG
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static void
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dprintf(msg, num)
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char *msg;
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int num;
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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) /*nada*/
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#endif
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static struct hostent *
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getanswer(answer, anslen, qname, qclass, qtype)
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const querybuf *answer;
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int anslen;
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const char *qname;
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int qclass, qtype;
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{
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register const HEADER *hp;
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register const u_char *cp;
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register int n;
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const u_char *eom;
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char *bp, **ap, **hap;
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int type, class, buflen, ancount, qdcount;
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int haveanswer, had_error;
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int toobig = 0;
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char tbuf[MAXDNAME+1];
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1995-08-23 00:47:57 +02:00
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const char *tname;
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1996-05-09 17:59:18 +02:00
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int (*name_ok) __P((const char *));
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1995-02-18 02:27:10 +01:00
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1995-08-23 00:47:57 +02:00
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tname = qname;
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1995-02-18 02:27:10 +01:00
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host.h_name = NULL;
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eom = answer->buf + anslen;
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1996-05-09 17:59:18 +02:00
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switch (qtype) {
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case T_A:
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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 = dn_isvalid;
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break;
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default:
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abort();
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}
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1995-02-18 02:27:10 +01:00
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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 = hostbuf;
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buflen = sizeof hostbuf;
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cp = answer->buf + HFIXEDSZ;
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if (qdcount != 1) {
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h_errno = NO_RECOVERY;
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return (NULL);
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}
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1996-05-09 17:59:18 +02:00
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n = dn_expand(answer->buf, eom, cp, bp, buflen);
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if ((n < 0) || !(*name_ok)(bp)) {
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1995-02-18 02:27:10 +01:00
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h_errno = NO_RECOVERY;
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return (NULL);
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}
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cp += n + QFIXEDSZ;
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if (qtype == T_A) {
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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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host.h_name = bp;
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bp += n;
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buflen -= n;
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/* The qname can be abbreviated, but h_name is now absolute. */
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qname = host.h_name;
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}
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ap = host_aliases;
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*ap = NULL;
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host.h_aliases = host_aliases;
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hap = h_addr_ptrs;
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*hap = NULL;
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#if BSD >= 43 || defined(h_addr) /* new-style hostent structure */
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host.h_addr_list = h_addr_ptrs;
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#endif
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haveanswer = 0;
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had_error = 0;
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while (ancount-- > 0 && cp < eom && !had_error) {
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n = dn_expand(answer->buf, eom, cp, bp, buflen);
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1996-05-09 17:59:18 +02:00
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if ((n < 0) || !(*name_ok)(bp)) {
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1995-02-18 02:27:10 +01:00
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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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type = _getshort(cp);
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cp += INT16SZ; /* type */
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class = _getshort(cp);
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cp += INT16SZ + INT32SZ; /* class, TTL */
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n = _getshort(cp);
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cp += INT16SZ; /* len */
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if (class != qclass) {
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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 && type == T_CNAME) {
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if (ap >= &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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1996-05-09 17:59:18 +02:00
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if ((n < 0) || !(*name_ok)(tbuf)) {
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1995-02-18 02:27:10 +01:00
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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 (host.h_name && strcasecmp(host.h_name, bp) != 0) {
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syslog(LOG_NOTICE|LOG_AUTH,
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"gethostby*.getanswer: asked for \"%s\", got CNAME for \"%s\"",
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host.h_name, bp);
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continue; /* XXX - had_error++ ? */
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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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bp += n;
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buflen -= 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 > buflen) {
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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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host.h_name = bp;
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bp += n;
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buflen -= n;
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continue;
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}
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1995-08-23 00:47:57 +02:00
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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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1996-05-09 17:59:18 +02:00
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if ((n < 0) || !res_hnok(tbuf)) {
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1995-08-23 00:47:57 +02:00
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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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/* Get canonical name. */
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n = strlen(tbuf) + 1; /* for the \0 */
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if (n > buflen) {
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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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buflen -= n;
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continue;
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}
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1995-02-18 02:27:10 +01:00
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if (type != qtype) {
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1995-08-23 00:47:57 +02:00
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syslog(LOG_NOTICE|LOG_AUTH,
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1995-02-18 02:27:10 +01:00
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"gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"",
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1995-08-23 00:47:57 +02:00
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qname, p_class(qclass), p_type(qtype),
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p_type(type));
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1995-02-18 02:27:10 +01:00
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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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1995-08-23 00:47:57 +02:00
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if (strcasecmp(tname, bp) != 0) {
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1995-02-18 02:27:10 +01:00
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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, buflen);
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1996-05-09 17:59:18 +02:00
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if ((n < 0) || !res_hnok(bp)) {
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1995-02-18 02:27:10 +01:00
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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 (!haveanswer)
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host.h_name = bp;
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else if (ap < &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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bp += n;
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buflen -= n;
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}
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break;
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#else
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host.h_name = bp;
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h_errno = NETDB_SUCCESS;
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return (&host);
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#endif
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case T_A:
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if (strcasecmp(host.h_name, bp) != 0) {
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syslog(LOG_NOTICE|LOG_AUTH,
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AskedForGot, host.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 (haveanswer) {
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if (n != host.h_length) {
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cp += n;
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continue;
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}
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|
} else {
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register int nn;
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host.h_length = n;
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host.h_addrtype = (class == C_IN)
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|
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? AF_INET
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|
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: AF_UNSPEC;
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host.h_name = bp;
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nn = strlen(bp) + 1; /* for the \0 */
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bp += nn;
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buflen -= nn;
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}
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bp += sizeof(align) - ((u_long)bp % sizeof(align));
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|
|
if (bp + n >= &hostbuf[sizeof hostbuf]) {
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|
|
dprintf("size (%d) too big\n", n);
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|
|
had_error++;
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|
|
continue;
|
|
|
|
}
|
|
|
|
if (hap >= &h_addr_ptrs[MAXADDRS-1]) {
|
|
|
|
if (!toobig++)
|
|
|
|
dprintf("Too many addresses (%d)\n",
|
|
|
|
MAXADDRS);
|
|
|
|
cp += n;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
bcopy(cp, *hap++ = bp, n);
|
|
|
|
bp += n;
|
|
|
|
cp += n;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
dprintf("Impossible condition (type=%d)\n", type);
|
|
|
|
h_errno = NO_RECOVERY;
|
|
|
|
return (NULL);
|
|
|
|
} /*switch*/
|
|
|
|
if (!had_error)
|
|
|
|
haveanswer++;
|
|
|
|
} /*while*/
|
|
|
|
if (haveanswer) {
|
|
|
|
*ap = NULL;
|
|
|
|
*hap = NULL;
|
|
|
|
# if defined(RESOLVSORT)
|
|
|
|
/*
|
|
|
|
* Note: we sort even if host can take only one address
|
|
|
|
* in its return structures - should give it the "best"
|
|
|
|
* address in that case, not some random one
|
|
|
|
*/
|
|
|
|
if (_res.nsort && haveanswer > 1 &&
|
|
|
|
qclass == C_IN && qtype == T_A)
|
|
|
|
addrsort(h_addr_ptrs, haveanswer);
|
|
|
|
# endif /*RESOLVSORT*/
|
|
|
|
#if BSD >= 43 || defined(h_addr) /* new-style hostent structure */
|
|
|
|
/* nothing */
|
|
|
|
#else
|
|
|
|
host.h_addr = h_addr_ptrs[0];
|
|
|
|
#endif /*BSD*/
|
|
|
|
if (!host.h_name) {
|
|
|
|
n = strlen(qname) + 1; /* for the \0 */
|
|
|
|
strcpy(bp, qname);
|
|
|
|
host.h_name = bp;
|
|
|
|
}
|
|
|
|
h_errno = NETDB_SUCCESS;
|
|
|
|
return (&host);
|
|
|
|
} else {
|
|
|
|
h_errno = TRY_AGAIN;
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
struct hostent *
|
|
|
|
gethostbyname(name)
|
|
|
|
const char *name;
|
1995-08-23 00:47:57 +02:00
|
|
|
{
|
Wed May 8 20:04:29 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>
* Rules (subdir_install): Depend on $(common-objpfx)sor-$(subdir).
[! libc.so-version]: Clear static-only-routines.
($(common-objpfx)sor-$(subdir)): New target.
[static-only-routines]: New static pattern rule for these .so's.
* Makerules [libc.so-version] ($(slibdir)/libc.so): Target removed.
[libc.so-version] ($(libdir)/libc.so, $(common-objpfx)libc-syms.so):
New targets replace it.
(install) [libc.so-version]: Depend on $(libdir)/libc.so instead of
$(slibdir)/libc.so.
* io/Makefile (static-only-routines): New variable.
* configure.in: Check for tools objdump and objcopy, and for awk.
* config.make.in (OBJDUMP, OBJCOPY, AWK): New variables.
Thu May 9 01:24:00 1996 Ulrich Drepper <drepper@cygnus.com>
* locale/programs/config.h: Remove definition of wint_t.
* locale/programs/ld-collate.c: Include <wchar.h> instead of
<wcstr.h>.
* manual/time.texi: Add some more description for %U and %W
format of strftime. Describe new format %V of strftime.
* resolv/gethnamaddr.c: Prevent warning by preventing variable
definition.
* stdio-common/_itoa.c: Ditto.
Tue May 7 23:43:07 1996 Ulrich Drepper <drepper@cygnus.com>
* libio/clearerr.c, libio/feof.c, libio/ferror.c, libio/fgetc.c,
libio/fileno.c, libio/fputc.c, libio/freopen.c, libio/fseek.c,
libio/genops.c, libio/getc.c, libio/getchar.c, libio/iofclose.c,
libio/iofflush.c, libio/iofgetpos.c, libio/iofgets.c,
libio/iofputs.c, libio/iofread.c, libio/iofsetpos.c,
libio/ioftell.c, libio/iofwrite.c, libio/iogetdelim.c,
libio/iogets.c, libio/ioputs.c, libio/iosetbuffer.c,
libio/iosetvbuf.c, libio/ioungetc.c, libio/iovsprintf.c,
libio/libio.h, libio/putc.c, libio/putchar.c, libio/rewind.c,
libio/stdio.h, stdio-common/printf_fp.c, stdio-common/vfprintf.c,
stdio-common/vfscanf.c: Prepare for reentrent libio.
* libio/clearerr_u.c, libio/feof_u.c, libio/ferror_u.c,
libio/fputc_u.c, libio/getc_u.c, libio/getchar_u.c,
libio/iofflush_u.c, libio/putc_u.c, libio/putchar_u.c: New files.
Used in reentrent libio.
* misc/getusershell.c: Prevent warnings.
1996-05-09 02:37:21 +02:00
|
|
|
/* Moved #if line to here because declararing HP would lead to a
|
|
|
|
warining. --drepper@gnu */
|
|
|
|
#if defined(AF_INET6) && defined(RES_TRY_INET6)
|
1995-08-23 00:47:57 +02:00
|
|
|
struct hostent *hp;
|
|
|
|
|
Wed May 8 20:04:29 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>
* Rules (subdir_install): Depend on $(common-objpfx)sor-$(subdir).
[! libc.so-version]: Clear static-only-routines.
($(common-objpfx)sor-$(subdir)): New target.
[static-only-routines]: New static pattern rule for these .so's.
* Makerules [libc.so-version] ($(slibdir)/libc.so): Target removed.
[libc.so-version] ($(libdir)/libc.so, $(common-objpfx)libc-syms.so):
New targets replace it.
(install) [libc.so-version]: Depend on $(libdir)/libc.so instead of
$(slibdir)/libc.so.
* io/Makefile (static-only-routines): New variable.
* configure.in: Check for tools objdump and objcopy, and for awk.
* config.make.in (OBJDUMP, OBJCOPY, AWK): New variables.
Thu May 9 01:24:00 1996 Ulrich Drepper <drepper@cygnus.com>
* locale/programs/config.h: Remove definition of wint_t.
* locale/programs/ld-collate.c: Include <wchar.h> instead of
<wcstr.h>.
* manual/time.texi: Add some more description for %U and %W
format of strftime. Describe new format %V of strftime.
* resolv/gethnamaddr.c: Prevent warning by preventing variable
definition.
* stdio-common/_itoa.c: Ditto.
Tue May 7 23:43:07 1996 Ulrich Drepper <drepper@cygnus.com>
* libio/clearerr.c, libio/feof.c, libio/ferror.c, libio/fgetc.c,
libio/fileno.c, libio/fputc.c, libio/freopen.c, libio/fseek.c,
libio/genops.c, libio/getc.c, libio/getchar.c, libio/iofclose.c,
libio/iofflush.c, libio/iofgetpos.c, libio/iofgets.c,
libio/iofputs.c, libio/iofread.c, libio/iofsetpos.c,
libio/ioftell.c, libio/iofwrite.c, libio/iogetdelim.c,
libio/iogets.c, libio/ioputs.c, libio/iosetbuffer.c,
libio/iosetvbuf.c, libio/ioungetc.c, libio/iovsprintf.c,
libio/libio.h, libio/putc.c, libio/putchar.c, libio/rewind.c,
libio/stdio.h, stdio-common/printf_fp.c, stdio-common/vfprintf.c,
stdio-common/vfscanf.c: Prepare for reentrent libio.
* libio/clearerr_u.c, libio/feof_u.c, libio/ferror_u.c,
libio/fputc_u.c, libio/getc_u.c, libio/getchar_u.c,
libio/iofflush_u.c, libio/putc_u.c, libio/putchar_u.c: New files.
Used in reentrent libio.
* misc/getusershell.c: Prevent warnings.
1996-05-09 02:37:21 +02:00
|
|
|
/* #if defined(AF_INET6) && defined(RES_TRY_INET6) */
|
1995-08-23 00:47:57 +02:00
|
|
|
if (_res.options & RES_TRY_INET6) {
|
|
|
|
hp = gethostbyname2(name, AF_INET6);
|
|
|
|
if (hp)
|
|
|
|
return (hp);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
return (gethostbyname2(name, AF_INET));
|
|
|
|
}
|
|
|
|
|
|
|
|
struct hostent *
|
|
|
|
gethostbyname2(name, af)
|
|
|
|
const char *name;
|
|
|
|
int af;
|
|
|
|
{
|
|
|
|
switch (af) {
|
|
|
|
case AF_INET:
|
|
|
|
return (gethostbyname_ipv4(name));
|
|
|
|
}
|
|
|
|
errno = EAFNOSUPPORT;
|
|
|
|
h_errno = NETDB_INTERNAL;
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct hostent *
|
|
|
|
gethostbyname_ipv4(name)
|
|
|
|
const char *name;
|
1995-02-18 02:27:10 +01:00
|
|
|
{
|
|
|
|
querybuf buf;
|
|
|
|
register const char *cp;
|
|
|
|
int n;
|
|
|
|
extern struct hostent *_gethtbyname();
|
|
|
|
|
1995-07-26 12:14:02 +02:00
|
|
|
if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
|
|
|
|
h_errno = NETDB_INTERNAL;
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
|
1995-02-18 02:27:10 +01:00
|
|
|
/*
|
|
|
|
* if there aren't any dots, it could be a user-level alias.
|
|
|
|
* this is also done in res_query() since we are not the only
|
|
|
|
* function that looks up host names.
|
|
|
|
*/
|
|
|
|
if (!strchr(name, '.') && (cp = __hostalias(name)))
|
|
|
|
name = cp;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* disallow names consisting only of digits/dots, unless
|
|
|
|
* they end in a dot.
|
|
|
|
*/
|
|
|
|
if (isdigit(name[0]))
|
|
|
|
for (cp = name;; ++cp) {
|
|
|
|
if (!*cp) {
|
|
|
|
if (*--cp == '.')
|
|
|
|
break;
|
|
|
|
/*
|
|
|
|
* All-numeric, no dot at the end.
|
|
|
|
* Fake up a hostent as if we'd actually
|
|
|
|
* done a lookup.
|
|
|
|
*/
|
|
|
|
if (!inet_aton(name, &host_addr)) {
|
|
|
|
h_errno = HOST_NOT_FOUND;
|
|
|
|
return (NULL);
|
|
|
|
}
|
1995-07-26 12:14:02 +02:00
|
|
|
strncpy(hostbuf, name, MAXDNAME);
|
|
|
|
hostbuf[MAXDNAME] = '\0';
|
|
|
|
host.h_name = hostbuf;
|
1995-02-18 02:27:10 +01:00
|
|
|
host.h_aliases = host_aliases;
|
|
|
|
host_aliases[0] = NULL;
|
|
|
|
host.h_addrtype = AF_INET;
|
|
|
|
host.h_length = INT32SZ;
|
|
|
|
h_addr_ptrs[0] = (char *)&host_addr;
|
|
|
|
h_addr_ptrs[1] = NULL;
|
|
|
|
#if BSD >= 43 || defined(h_addr) /* new-style hostent structure */
|
|
|
|
host.h_addr_list = h_addr_ptrs;
|
|
|
|
#else
|
|
|
|
host.h_addr = h_addr_ptrs[0];
|
|
|
|
#endif
|
|
|
|
h_errno = NETDB_SUCCESS;
|
|
|
|
return (&host);
|
|
|
|
}
|
|
|
|
if (!isdigit(*cp) && *cp != '.')
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if ((n = res_search(name, C_IN, T_A, buf.buf, sizeof(buf))) < 0) {
|
|
|
|
dprintf("res_search failed (%d)\n", n);
|
|
|
|
if (errno == ECONNREFUSED)
|
|
|
|
return (_gethtbyname(name));
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
return (getanswer(&buf, n, name, C_IN, T_A));
|
|
|
|
}
|
|
|
|
|
|
|
|
struct hostent *
|
|
|
|
gethostbyaddr(addr, len, type)
|
|
|
|
const char *addr;
|
|
|
|
int len, type;
|
|
|
|
{
|
|
|
|
int n;
|
|
|
|
querybuf buf;
|
|
|
|
register struct hostent *hp;
|
|
|
|
char qbuf[MAXDNAME+1];
|
|
|
|
#ifdef SUNSECURITY
|
|
|
|
register struct hostent *rhp;
|
|
|
|
char **haddr;
|
|
|
|
u_long old_options;
|
|
|
|
char hname2[MAXDNAME+1];
|
|
|
|
#endif /*SUNSECURITY*/
|
|
|
|
extern struct hostent *_gethtbyaddr();
|
|
|
|
|
1995-07-26 12:14:02 +02:00
|
|
|
if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
|
|
|
|
h_errno = NETDB_INTERNAL;
|
|
|
|
return (NULL);
|
|
|
|
}
|
1996-05-09 17:59:18 +02:00
|
|
|
if (type != AF_INET || len != INADDRSZ) {
|
1995-02-18 02:27:10 +01:00
|
|
|
errno = EAFNOSUPPORT;
|
|
|
|
h_errno = NETDB_INTERNAL;
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
(void)sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa",
|
|
|
|
((unsigned)addr[3] & 0xff),
|
|
|
|
((unsigned)addr[2] & 0xff),
|
|
|
|
((unsigned)addr[1] & 0xff),
|
|
|
|
((unsigned)addr[0] & 0xff));
|
|
|
|
n = res_query(qbuf, C_IN, T_PTR, (u_char *)buf.buf, sizeof buf.buf);
|
|
|
|
if (n < 0) {
|
|
|
|
dprintf("res_query failed (%d)\n", n);
|
|
|
|
if (errno == ECONNREFUSED)
|
|
|
|
return (_gethtbyaddr(addr, len, type));
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
if (!(hp = getanswer(&buf, n, qbuf, C_IN, T_PTR)))
|
|
|
|
return (NULL); /* h_errno was set by getanswer() */
|
|
|
|
#ifdef SUNSECURITY
|
|
|
|
/*
|
|
|
|
* turn off search as the name should be absolute,
|
|
|
|
* 'localhost' should be matched by defnames
|
|
|
|
*/
|
|
|
|
strncpy(hname2, hp->h_name, MAXDNAME);
|
|
|
|
hname2[MAXDNAME] = '\0';
|
|
|
|
old_options = _res.options;
|
|
|
|
_res.options &= ~RES_DNSRCH;
|
|
|
|
_res.options |= RES_DEFNAMES;
|
1995-07-26 12:14:02 +02:00
|
|
|
if (!(rhp = gethostbyname(hname2))) {
|
1995-02-18 02:27:10 +01:00
|
|
|
syslog(LOG_NOTICE|LOG_AUTH,
|
|
|
|
"gethostbyaddr: No A record for %s (verifying [%s])",
|
|
|
|
hname2, inet_ntoa(*((struct in_addr *)addr)));
|
|
|
|
_res.options = old_options;
|
|
|
|
h_errno = HOST_NOT_FOUND;
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
_res.options = old_options;
|
|
|
|
for (haddr = rhp->h_addr_list; *haddr; haddr++)
|
|
|
|
if (!memcmp(*haddr, addr, INADDRSZ))
|
|
|
|
break;
|
|
|
|
if (!*haddr) {
|
|
|
|
syslog(LOG_NOTICE|LOG_AUTH,
|
|
|
|
"gethostbyaddr: A record of %s != PTR record [%s]",
|
|
|
|
hname2, inet_ntoa(*((struct in_addr *)addr)));
|
|
|
|
h_errno = HOST_NOT_FOUND;
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
#endif /*SUNSECURITY*/
|
|
|
|
hp->h_addrtype = type;
|
|
|
|
hp->h_length = len;
|
|
|
|
h_addr_ptrs[0] = (char *)&host_addr;
|
|
|
|
h_addr_ptrs[1] = NULL;
|
|
|
|
host_addr = *(struct in_addr *)addr;
|
|
|
|
h_errno = NETDB_SUCCESS;
|
|
|
|
return (hp);
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
_sethtent(f)
|
|
|
|
int f;
|
|
|
|
{
|
|
|
|
if (!hostf)
|
|
|
|
hostf = fopen(_PATH_HOSTS, "r" );
|
|
|
|
else
|
|
|
|
rewind(hostf);
|
|
|
|
stayopen = f;
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
_endhtent()
|
|
|
|
{
|
|
|
|
if (hostf && !stayopen) {
|
|
|
|
(void) fclose(hostf);
|
|
|
|
hostf = NULL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
struct hostent *
|
|
|
|
_gethtent()
|
|
|
|
{
|
|
|
|
char *p;
|
|
|
|
register char *cp, **q;
|
|
|
|
|
|
|
|
if (!hostf && !(hostf = fopen(_PATH_HOSTS, "r" ))) {
|
|
|
|
h_errno = NETDB_INTERNAL;
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
again:
|
|
|
|
if (!(p = fgets(hostbuf, sizeof hostbuf, hostf))) {
|
|
|
|
h_errno = HOST_NOT_FOUND;
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
if (*p == '#')
|
|
|
|
goto again;
|
|
|
|
if (!(cp = strpbrk(p, "#\n")))
|
|
|
|
goto again;
|
|
|
|
*cp = '\0';
|
|
|
|
if (!(cp = strpbrk(p, " \t")))
|
|
|
|
goto again;
|
|
|
|
*cp++ = '\0';
|
|
|
|
/* THIS STUFF IS INTERNET SPECIFIC */
|
|
|
|
if (!inet_aton(p, &host_addr))
|
|
|
|
goto again;
|
|
|
|
h_addr_ptrs[0] = (char *)&host_addr;
|
|
|
|
h_addr_ptrs[1] = NULL;
|
|
|
|
#if BSD >= 43 || defined(h_addr) /* new-style hostent structure */
|
|
|
|
host.h_addr_list = h_addr_ptrs;
|
|
|
|
#else
|
|
|
|
host.h_addr = h_addr_ptrs[0];
|
|
|
|
#endif
|
|
|
|
host.h_length = INT32SZ;
|
|
|
|
host.h_addrtype = AF_INET;
|
|
|
|
while (*cp == ' ' || *cp == '\t')
|
|
|
|
cp++;
|
|
|
|
host.h_name = cp;
|
|
|
|
q = host.h_aliases = host_aliases;
|
|
|
|
if (cp = strpbrk(cp, " \t"))
|
|
|
|
*cp++ = '\0';
|
|
|
|
while (cp && *cp) {
|
|
|
|
if (*cp == ' ' || *cp == '\t') {
|
|
|
|
cp++;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
if (q < &host_aliases[MAXALIASES - 1])
|
|
|
|
*q++ = cp;
|
|
|
|
if (cp = strpbrk(cp, " \t"))
|
|
|
|
*cp++ = '\0';
|
|
|
|
}
|
|
|
|
*q = NULL;
|
|
|
|
h_errno = NETDB_SUCCESS;
|
|
|
|
return (&host);
|
|
|
|
}
|
|
|
|
|
|
|
|
struct hostent *
|
|
|
|
_gethtbyname(name)
|
|
|
|
char *name;
|
|
|
|
{
|
|
|
|
register struct hostent *p;
|
|
|
|
register char **cp;
|
|
|
|
|
|
|
|
_sethtent(0);
|
|
|
|
while (p = _gethtent()) {
|
|
|
|
if (strcasecmp(p->h_name, name) == 0)
|
|
|
|
break;
|
|
|
|
for (cp = p->h_aliases; *cp != 0; cp++)
|
|
|
|
if (strcasecmp(*cp, name) == 0)
|
|
|
|
goto found;
|
|
|
|
}
|
|
|
|
found:
|
|
|
|
_endhtent();
|
|
|
|
return (p);
|
|
|
|
}
|
|
|
|
|
|
|
|
struct hostent *
|
|
|
|
_gethtbyaddr(addr, len, type)
|
|
|
|
const char *addr;
|
|
|
|
int len, type;
|
|
|
|
{
|
|
|
|
register struct hostent *p;
|
|
|
|
|
|
|
|
_sethtent(0);
|
|
|
|
while (p = _gethtent())
|
|
|
|
if (p->h_addrtype == type && !bcmp(p->h_addr, addr, len))
|
|
|
|
break;
|
|
|
|
_endhtent();
|
|
|
|
return (p);
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef RESOLVSORT
|
|
|
|
static void
|
|
|
|
addrsort(ap, num)
|
|
|
|
char **ap;
|
|
|
|
int num;
|
|
|
|
{
|
|
|
|
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
|
|
|
|
|
|
|
|
#if defined(BSD43_BSD43_NFS) || defined(sun)
|
|
|
|
/* some libc's out there are bound internally to these names (UMIPS) */
|
|
|
|
void
|
|
|
|
ht_sethostent(stayopen)
|
|
|
|
int stayopen;
|
|
|
|
{
|
|
|
|
_sethtent(stayopen);
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
ht_endhostent()
|
|
|
|
{
|
|
|
|
_endhtent();
|
|
|
|
}
|
|
|
|
|
|
|
|
struct hostent *
|
|
|
|
ht_gethostbyname(name)
|
|
|
|
char *name;
|
|
|
|
{
|
|
|
|
return (_gethtbyname(name));
|
|
|
|
}
|
|
|
|
|
|
|
|
struct hostent *
|
|
|
|
ht_gethostbyaddr(addr, len, type)
|
|
|
|
const char *addr;
|
|
|
|
int len, type;
|
|
|
|
{
|
|
|
|
return (_gethtbyaddr(addr, len, type));
|
|
|
|
}
|
|
|
|
|
|
|
|
struct hostent *
|
|
|
|
gethostent()
|
|
|
|
{
|
|
|
|
return (_gethtent());
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
dns_service()
|
|
|
|
{
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
#undef dn_skipname
|
|
|
|
dn_skipname(comp_dn, eom)
|
|
|
|
const u_char *comp_dn, *eom;
|
|
|
|
{
|
|
|
|
return (__dn_skipname(comp_dn, eom));
|
|
|
|
}
|
|
|
|
#endif /*old-style libc with yp junk in it*/
|