721 lines
17 KiB
C
721 lines
17 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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* 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 fromrcsid[] = "From: Id: gethnamaddr.c,v 8.20 1996/09/28 06:51:07 vixie Exp";
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static char rcsid[] = "$Id: gethostbydns.c,v 1.20 1997/02/22 15:00:06 peter Exp $";
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#endif /* LIBC_SCCS and not lint */
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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 <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 "res_config.h"
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#define SPRINTF(x) ((size_t)sprintf x)
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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*.gethostanswer: asked for \"%s\", got \"%s\"";
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static char *h_addr_ptrs[MAXADDRS + 1];
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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 u_char host_addr[16]; /* IPv4 or IPv6 */
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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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int _dns_ttl_;
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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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gethostanswer(answer, anslen, qname, 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 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];
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const char *tname;
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int (*name_ok) __P((const char *));
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tname = qname;
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host.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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h_errno = NO_RECOVERY;
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return (NULL); /* 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 = 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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n = dn_expand(answer->buf, eom, cp, bp, buflen);
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if ((n < 0) || !(*name_ok)(bp)) {
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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 || 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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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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host.h_addr_list = 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, buflen);
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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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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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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 >= &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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/* 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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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_hnok(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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/* 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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if (type != qtype) {
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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, buflen);
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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 (!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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if (_res.options & RES_USE_INET6) {
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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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_map_v4v6_hostent(&host, &bp, &buflen);
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}
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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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case T_AAAA:
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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 (n != host.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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register int nn;
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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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|
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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;
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}
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if (hap >= &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);
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cp += n;
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continue;
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}
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bcopy(cp, *hap++ = bp, n);
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bp += n;
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buflen -= n;
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cp += n;
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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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h_errno = NO_RECOVERY;
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return (NULL);
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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 (_res.nsort && haveanswer > 1 && qtype == T_A)
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addrsort(h_addr_ptrs, haveanswer);
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# endif /*RESOLVSORT*/
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if (!host.h_name) {
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n = strlen(qname) + 1; /* for the \0 */
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if (n > buflen)
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goto try_again;
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strcpy(bp, qname);
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host.h_name = bp;
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bp += n;
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buflen -= n;
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}
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if (_res.options & RES_USE_INET6)
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_map_v4v6_hostent(&host, &bp, &buflen);
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h_errno = NETDB_SUCCESS;
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return (&host);
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}
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try_again:
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h_errno = TRY_AGAIN;
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return (NULL);
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}
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|
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struct hostent *
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__dns_getanswer(answer, anslen, qname, qtype)
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const char *answer;
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int anslen;
|
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const char *qname;
|
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int qtype;
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{
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|
switch(qtype) {
|
|
case T_AAAA:
|
|
host.h_addrtype = AF_INET6;
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host.h_length = IN6ADDRSZ;
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break;
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case T_A:
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default:
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host.h_addrtype = AF_INET;
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host.h_length = INADDRSZ;
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break;
|
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}
|
|
|
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return(gethostanswer((const querybuf *)answer, anslen, qname, qtype));
|
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}
|
|
|
|
struct hostent *
|
|
_gethostbydnsname(name, af)
|
|
const char *name;
|
|
int af;
|
|
{
|
|
querybuf buf;
|
|
register const char *cp;
|
|
char *bp;
|
|
int n, size, type, len;
|
|
|
|
if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
|
|
h_errno = NETDB_INTERNAL;
|
|
return (NULL);
|
|
}
|
|
|
|
switch (af) {
|
|
case AF_INET:
|
|
size = INADDRSZ;
|
|
type = T_A;
|
|
break;
|
|
case AF_INET6:
|
|
size = IN6ADDRSZ;
|
|
type = T_AAAA;
|
|
break;
|
|
default:
|
|
h_errno = NETDB_INTERNAL;
|
|
errno = EAFNOSUPPORT;
|
|
return (NULL);
|
|
}
|
|
|
|
host.h_addrtype = af;
|
|
host.h_length = size;
|
|
|
|
/*
|
|
* 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_pton(af, name, host_addr) <= 0) {
|
|
h_errno = HOST_NOT_FOUND;
|
|
return (NULL);
|
|
}
|
|
strncpy(hostbuf, name, MAXDNAME);
|
|
hostbuf[MAXDNAME] = '\0';
|
|
bp = hostbuf + MAXDNAME;
|
|
len = sizeof hostbuf - MAXDNAME;
|
|
host.h_name = hostbuf;
|
|
host.h_aliases = host_aliases;
|
|
host_aliases[0] = NULL;
|
|
h_addr_ptrs[0] = (char *)host_addr;
|
|
h_addr_ptrs[1] = NULL;
|
|
host.h_addr_list = h_addr_ptrs;
|
|
if (_res.options & RES_USE_INET6)
|
|
_map_v4v6_hostent(&host, &bp, &len);
|
|
h_errno = NETDB_SUCCESS;
|
|
return (&host);
|
|
}
|
|
if (!isdigit(*cp) && *cp != '.')
|
|
break;
|
|
}
|
|
if ((isxdigit(name[0]) && strchr(name, ':') != NULL) ||
|
|
name[0] == ':')
|
|
for (cp = name;; ++cp) {
|
|
if (!*cp) {
|
|
if (*--cp == '.')
|
|
break;
|
|
/*
|
|
* All-IPv6-legal, no dot at the end.
|
|
* Fake up a hostent as if we'd actually
|
|
* done a lookup.
|
|
*/
|
|
if (inet_pton(af, name, host_addr) <= 0) {
|
|
h_errno = HOST_NOT_FOUND;
|
|
return (NULL);
|
|
}
|
|
strncpy(hostbuf, name, MAXDNAME);
|
|
hostbuf[MAXDNAME] = '\0';
|
|
bp = hostbuf + MAXDNAME;
|
|
len = sizeof hostbuf - MAXDNAME;
|
|
host.h_name = hostbuf;
|
|
host.h_aliases = host_aliases;
|
|
host_aliases[0] = NULL;
|
|
h_addr_ptrs[0] = (char *)host_addr;
|
|
h_addr_ptrs[1] = NULL;
|
|
host.h_addr_list = h_addr_ptrs;
|
|
h_errno = NETDB_SUCCESS;
|
|
return (&host);
|
|
}
|
|
if (!isxdigit(*cp) && *cp != ':' && *cp != '.')
|
|
break;
|
|
}
|
|
|
|
if ((n = res_search(name, C_IN, type, buf.buf, sizeof(buf))) < 0) {
|
|
dprintf("res_search failed (%d)\n", n);
|
|
return (NULL);
|
|
}
|
|
return (gethostanswer(&buf, n, name, type));
|
|
}
|
|
|
|
struct hostent *
|
|
_gethostbydnsaddr(addr, len, af)
|
|
const char *addr; /* XXX should have been def'd as u_char! */
|
|
int len, af;
|
|
{
|
|
const u_char *uaddr = (const u_char *)addr;
|
|
static const u_char mapped[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0xff,0xff };
|
|
static const u_char tunnelled[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0,0 };
|
|
int n, size;
|
|
querybuf buf;
|
|
register struct hostent *hp;
|
|
char qbuf[MAXDNAME+1], *qp;
|
|
#ifdef SUNSECURITY
|
|
register struct hostent *rhp;
|
|
char **haddr;
|
|
u_long old_options;
|
|
char hname2[MAXDNAME+1];
|
|
#endif /*SUNSECURITY*/
|
|
|
|
if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
|
|
h_errno = NETDB_INTERNAL;
|
|
return (NULL);
|
|
}
|
|
if (af == AF_INET6 && len == IN6ADDRSZ &&
|
|
(!bcmp(uaddr, mapped, sizeof mapped) ||
|
|
!bcmp(uaddr, tunnelled, sizeof tunnelled))) {
|
|
/* Unmap. */
|
|
addr += sizeof mapped;
|
|
uaddr += sizeof mapped;
|
|
af = AF_INET;
|
|
len = INADDRSZ;
|
|
}
|
|
switch (af) {
|
|
case AF_INET:
|
|
size = INADDRSZ;
|
|
break;
|
|
case AF_INET6:
|
|
size = IN6ADDRSZ;
|
|
break;
|
|
default:
|
|
errno = EAFNOSUPPORT;
|
|
h_errno = NETDB_INTERNAL;
|
|
return (NULL);
|
|
}
|
|
if (size != len) {
|
|
errno = EINVAL;
|
|
h_errno = NETDB_INTERNAL;
|
|
return (NULL);
|
|
}
|
|
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 = IN6ADDRSZ - 1; n >= 0; n--) {
|
|
qp += SPRINTF((qp, "%x.%x.",
|
|
uaddr[n] & 0xf,
|
|
(uaddr[n] >> 4) & 0xf));
|
|
}
|
|
strcpy(qp, "ip6.int");
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
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);
|
|
return (NULL);
|
|
}
|
|
if (!(hp = gethostanswer(&buf, n, qbuf, T_PTR)))
|
|
return (NULL); /* h_errno was set by gethostanswer() */
|
|
#ifdef SUNSECURITY
|
|
if (af == AF_INET) {
|
|
/*
|
|
* 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;
|
|
if (!(rhp = gethostbyname(hname2))) {
|
|
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 = af;
|
|
hp->h_length = len;
|
|
bcopy(addr, host_addr, len);
|
|
h_addr_ptrs[0] = (char *)host_addr;
|
|
h_addr_ptrs[1] = NULL;
|
|
if (af == AF_INET && (_res.options & RES_USE_INET6)) {
|
|
_map_v4v6_address((char*)host_addr, (char*)host_addr);
|
|
hp->h_addrtype = AF_INET6;
|
|
hp->h_length = IN6ADDRSZ;
|
|
}
|
|
h_errno = NETDB_SUCCESS;
|
|
return (hp);
|
|
}
|
|
|
|
#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
|
|
void
|
|
_sethostdnsent(stayopen)
|
|
int stayopen;
|
|
{
|
|
if ((_res.options & RES_INIT) == 0 && res_init() == -1)
|
|
return;
|
|
if (stayopen)
|
|
_res.options |= RES_STAYOPEN | RES_USEVC;
|
|
}
|
|
|
|
void
|
|
_endhostdnsent()
|
|
{
|
|
_res.options &= ~(RES_STAYOPEN | RES_USEVC);
|
|
res_close();
|
|
}
|