1415 lines
30 KiB
C
1415 lines
30 KiB
C
/* $NetBSD: gethnamaddr.c,v 1.33 2000/05/23 07:03:10 tron Exp $ */
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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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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93";
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static char rcsid[] = "Id: gethnamaddr.c,v 8.21 1997/06/01 20:34:37 vixie Exp ";
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#else
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__RCSID("$NetBSD: gethnamaddr.c,v 1.33 2000/05/23 07:03:10 tron Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#if defined(_LIBC)
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#include "namespace.h"
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#endif
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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 <assert.h>
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#include <ctype.h>
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#include <errno.h>
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#include <netdb.h>
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#include <resolv.h>
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#include <stdio.h>
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#include <syslog.h>
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#ifdef __STDC__
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#include <stdarg.h>
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#else
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#include <varargs.h>
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#endif
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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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#include <nsswitch.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef YP
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#include <rpc/rpc.h>
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#include <rpcsvc/yp_prot.h>
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#include <rpcsvc/ypclnt.h>
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#endif
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#if defined(_LIBC) && defined(__weak_alias)
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__weak_alias(gethostbyaddr,_gethostbyaddr)
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__weak_alias(gethostbyname,_gethostbyname)
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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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#ifdef YP
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static char *__ypdomain;
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#endif
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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_int32_t host_addr[16 / sizeof(u_int32_t)]; /* IPv4 or IPv6 */
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static FILE *hostf = NULL;
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static int stayopen = 0;
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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 dprintf __P((char *, int));
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#endif
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static struct hostent *getanswer __P((const querybuf *, int,
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const char *, int));
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static void map_v4v6_address __P((const char *, char *));
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static void map_v4v6_hostent __P((struct hostent *, char **, int *));
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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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struct hostent *gethostbyname __P((const char *));
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struct hostent *gethostbyname2 __P((const char *, int));
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struct hostent *gethostbyaddr __P((const char *, int, int ));
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void _sethtent __P((int));
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void _endhtent __P((void));
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struct hostent *_gethtent __P((void));
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struct hostent *_gethtbyname2 __P((const char *, int));
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void ht_sethostent __P((int));
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void ht_endhostent __P((void));
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struct hostent *ht_gethostbyname __P((char *));
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struct hostent *ht_gethostbyaddr __P((const char *, int, int ));
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struct hostent *gethostent __P((void));
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void dns_service __P((void));
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int dn_skipname __P((const u_char *, const u_char *));
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int _gethtbyaddr __P((void *, void *, va_list));
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int _gethtbyname __P((void *, void *, va_list));
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int _dns_gethtbyaddr __P((void *, void *, va_list));
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int _dns_gethtbyname __P((void *, void *, va_list));
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#ifdef YP
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struct hostent *_yphostent __P((char *, int));
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int _yp_gethtbyaddr __P((void *, void *, va_list));
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int _yp_gethtbyname __P((void *, void *, va_list));
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#endif
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static const ns_src default_dns_files[] = {
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{ NSSRC_FILES, NS_SUCCESS },
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{ NSSRC_DNS, NS_SUCCESS },
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{ 0 }
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};
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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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_DIAGASSERT(msg != NULL);
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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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#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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h_errno = NO_RECOVERY; \
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return (NULL); \
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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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h_errno = NO_RECOVERY; \
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return (NULL); \
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} \
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} while (0)
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static struct hostent *
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getanswer(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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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, **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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_DIAGASSERT(answer != NULL);
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_DIAGASSERT(qname != NULL);
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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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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;
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BOUNDED_INCR(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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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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h_errno = NO_RECOVERY;
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return (NULL);
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}
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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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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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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 + INT32SZ; /* class, 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 >= &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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h_errno = NO_RECOVERY;
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return (NULL);
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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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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 || 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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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_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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h_errno = NO_RECOVERY;
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return (NULL);
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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 > buflen || 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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buflen -= n;
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continue;
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}
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if (type != qtype) {
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if (type != T_KEY && type != T_SIG)
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syslog(LOG_NOTICE|LOG_AUTH,
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"gethostby*.getanswer: 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 (cp != erdata) {
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h_errno = NO_RECOVERY;
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return (NULL);
|
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}
|
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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;
|
|
if (n != -1) {
|
|
n = strlen(bp) + 1; /* for the \0 */
|
|
if (n >= MAXHOSTNAMELEN) {
|
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had_error++;
|
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break;
|
|
}
|
|
bp += n;
|
|
buflen -= n;
|
|
}
|
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break;
|
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#else
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host.h_name = bp;
|
|
if (_res.options & RES_USE_INET6) {
|
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n = strlen(bp) + 1; /* for the \0 */
|
|
if (n >= MAXHOSTNAMELEN) {
|
|
had_error++;
|
|
break;
|
|
}
|
|
bp += n;
|
|
buflen -= n;
|
|
map_v4v6_hostent(&host, &bp, &buflen);
|
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}
|
|
h_errno = NETDB_SUCCESS;
|
|
return (&host);
|
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#endif
|
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case T_A:
|
|
case T_AAAA:
|
|
if (strcasecmp(host.h_name, bp) != 0) {
|
|
syslog(LOG_NOTICE|LOG_AUTH,
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AskedForGot, host.h_name, bp);
|
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cp += n;
|
|
continue; /* XXX - had_error++ ? */
|
|
}
|
|
if (n != host.h_length) {
|
|
cp += n;
|
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continue;
|
|
}
|
|
if (!haveanswer) {
|
|
int nn;
|
|
|
|
host.h_name = bp;
|
|
nn = strlen(bp) + 1; /* for the \0 */
|
|
bp += nn;
|
|
buflen -= nn;
|
|
}
|
|
|
|
bp += sizeof(align) -
|
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(size_t)((u_long)bp % sizeof(align));
|
|
|
|
if (bp + n >= &hostbuf[sizeof hostbuf]) {
|
|
dprintf("size (%d) too big\n", n);
|
|
had_error++;
|
|
continue;
|
|
}
|
|
if (hap >= &h_addr_ptrs[MAXADDRS-1]) {
|
|
if (!toobig++)
|
|
dprintf("Too many addresses (%d)\n",
|
|
MAXADDRS);
|
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cp += n;
|
|
continue;
|
|
}
|
|
(void)memcpy(*hap++ = bp, cp, (size_t)n);
|
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bp += n;
|
|
buflen -= n;
|
|
cp += n;
|
|
if (cp != erdata) {
|
|
h_errno = NO_RECOVERY;
|
|
return (NULL);
|
|
}
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
if (!had_error)
|
|
haveanswer++;
|
|
}
|
|
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 && qtype == T_A)
|
|
addrsort(h_addr_ptrs, haveanswer);
|
|
# endif /*RESOLVSORT*/
|
|
if (!host.h_name) {
|
|
n = strlen(qname) + 1; /* for the \0 */
|
|
if (n > buflen || n >= MAXHOSTNAMELEN)
|
|
goto no_recovery;
|
|
strcpy(bp, qname);
|
|
host.h_name = bp;
|
|
bp += n;
|
|
buflen -= n;
|
|
}
|
|
if (_res.options & RES_USE_INET6)
|
|
map_v4v6_hostent(&host, &bp, &buflen);
|
|
h_errno = NETDB_SUCCESS;
|
|
return (&host);
|
|
}
|
|
no_recovery:
|
|
h_errno = NO_RECOVERY;
|
|
return (NULL);
|
|
}
|
|
|
|
struct hostent *
|
|
gethostbyname(name)
|
|
const char *name;
|
|
{
|
|
struct hostent *hp;
|
|
|
|
_DIAGASSERT(name != NULL);
|
|
|
|
if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
|
|
h_errno = NETDB_INTERNAL;
|
|
return (NULL);
|
|
}
|
|
if (_res.options & RES_USE_INET6) {
|
|
hp = gethostbyname2(name, AF_INET6);
|
|
if (hp)
|
|
return (hp);
|
|
}
|
|
return (gethostbyname2(name, AF_INET));
|
|
}
|
|
|
|
struct hostent *
|
|
gethostbyname2(name, af)
|
|
const char *name;
|
|
int af;
|
|
{
|
|
const char *cp;
|
|
char *bp;
|
|
int size, len;
|
|
struct hostent *hp;
|
|
static const ns_dtab dtab[] = {
|
|
NS_FILES_CB(_gethtbyname, NULL)
|
|
{ NSSRC_DNS, _dns_gethtbyname, NULL }, /* force -DHESIOD */
|
|
NS_NIS_CB(_yp_gethtbyname, NULL)
|
|
{ 0 }
|
|
};
|
|
|
|
_DIAGASSERT(name != NULL);
|
|
|
|
switch (af) {
|
|
case AF_INET:
|
|
size = INADDRSZ;
|
|
break;
|
|
case AF_INET6:
|
|
size = IN6ADDRSZ;
|
|
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,
|
|
(char *)(void *)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 *)(void *)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,
|
|
(char *)(void *)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 *)(void *)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;
|
|
}
|
|
|
|
hp = (struct hostent *)NULL;
|
|
h_errno = NETDB_INTERNAL;
|
|
if (nsdispatch(&hp, dtab, NSDB_HOSTS, "gethostbyname",
|
|
default_dns_files, name, len, af) != NS_SUCCESS)
|
|
return (struct hostent *)NULL;
|
|
h_errno = NETDB_SUCCESS;
|
|
return (hp);
|
|
}
|
|
|
|
struct hostent *
|
|
gethostbyaddr(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;
|
|
int size;
|
|
struct hostent *hp;
|
|
static const ns_dtab dtab[] = {
|
|
NS_FILES_CB(_gethtbyaddr, NULL)
|
|
{ NSSRC_DNS, _dns_gethtbyaddr, NULL }, /* force -DHESIOD */
|
|
NS_NIS_CB(_yp_gethtbyaddr, NULL)
|
|
{ 0 }
|
|
};
|
|
|
|
_DIAGASSERT(addr != NULL);
|
|
|
|
if (af == AF_INET6 && len == IN6ADDRSZ &&
|
|
(IN6_IS_ADDR_V4MAPPED((const struct in6_addr *)(const void *)uaddr) ||
|
|
IN6_IS_ADDR_V4COMPAT((const struct in6_addr *)(const void *)uaddr))) {
|
|
/* Unmap. */
|
|
addr += IN6ADDRSZ - INADDRSZ;
|
|
uaddr += IN6ADDRSZ - INADDRSZ;
|
|
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);
|
|
}
|
|
hp = (struct hostent *)NULL;
|
|
h_errno = NETDB_INTERNAL;
|
|
if (nsdispatch(&hp, dtab, NSDB_HOSTS, "gethostbyaddr",
|
|
default_dns_files, uaddr, len, af) != NS_SUCCESS)
|
|
return (struct hostent *)NULL;
|
|
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;
|
|
char *cp, **q;
|
|
int af, len;
|
|
|
|
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';
|
|
if (inet_pton(AF_INET6, p, (char *)(void *)host_addr) > 0) {
|
|
af = AF_INET6;
|
|
len = IN6ADDRSZ;
|
|
} else if (inet_pton(AF_INET, p, (char *)(void *)host_addr) > 0) {
|
|
if (_res.options & RES_USE_INET6) {
|
|
map_v4v6_address((char *)(void *)host_addr,
|
|
(char *)(void *)host_addr);
|
|
af = AF_INET6;
|
|
len = IN6ADDRSZ;
|
|
} else {
|
|
af = AF_INET;
|
|
len = INADDRSZ;
|
|
}
|
|
} else {
|
|
goto again;
|
|
}
|
|
/* if this is not something we're looking for, skip it. */
|
|
if (host.h_addrtype != af)
|
|
goto again;
|
|
if (host.h_length != len)
|
|
goto again;
|
|
h_addr_ptrs[0] = (char *)(void *)host_addr;
|
|
h_addr_ptrs[1] = NULL;
|
|
host.h_addr_list = h_addr_ptrs;
|
|
host.h_length = len;
|
|
host.h_addrtype = af;
|
|
while (*cp == ' ' || *cp == '\t')
|
|
cp++;
|
|
host.h_name = cp;
|
|
q = host.h_aliases = host_aliases;
|
|
if ((cp = strpbrk(cp, " \t")) != NULL)
|
|
*cp++ = '\0';
|
|
while (cp && *cp) {
|
|
if (*cp == ' ' || *cp == '\t') {
|
|
cp++;
|
|
continue;
|
|
}
|
|
if (q < &host_aliases[MAXALIASES - 1])
|
|
*q++ = cp;
|
|
if ((cp = strpbrk(cp, " \t")) != NULL)
|
|
*cp++ = '\0';
|
|
}
|
|
*q = NULL;
|
|
h_errno = NETDB_SUCCESS;
|
|
return (&host);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
_gethtbyname(rv, cb_data, ap)
|
|
void *rv;
|
|
void *cb_data;
|
|
va_list ap;
|
|
{
|
|
struct hostent *hp;
|
|
const char *name;
|
|
int af;
|
|
|
|
_DIAGASSERT(rv != NULL);
|
|
|
|
name = va_arg(ap, char *);
|
|
/* NOSTRICT skip len */(void)va_arg(ap, int);
|
|
af = va_arg(ap, int);
|
|
|
|
hp = NULL;
|
|
#if 0
|
|
if (_res.options & RES_USE_INET6)
|
|
hp = _gethtbyname2(name, AF_INET6);
|
|
if (hp==NULL)
|
|
hp = _gethtbyname2(name, AF_INET);
|
|
#else
|
|
hp = _gethtbyname2(name, af);
|
|
#endif
|
|
*((struct hostent **)rv) = hp;
|
|
if (hp==NULL) {
|
|
h_errno = HOST_NOT_FOUND;
|
|
return NS_NOTFOUND;
|
|
}
|
|
return NS_SUCCESS;
|
|
}
|
|
|
|
struct hostent *
|
|
_gethtbyname2(name, af)
|
|
const char *name;
|
|
int af;
|
|
{
|
|
struct hostent *p;
|
|
char *tmpbuf, *ptr, **cp;
|
|
int num;
|
|
size_t len;
|
|
|
|
_DIAGASSERT(name != NULL);
|
|
|
|
_sethtent(0);
|
|
ptr = tmpbuf = NULL;
|
|
num = 0;
|
|
while ((p = _gethtent()) != NULL && num < MAXADDRS) {
|
|
if (p->h_addrtype != af)
|
|
continue;
|
|
if (strcasecmp(p->h_name, name) != 0) {
|
|
for (cp = p->h_aliases; *cp != NULL; cp++)
|
|
if (strcasecmp(*cp, name) == 0)
|
|
break;
|
|
if (*cp == NULL) continue;
|
|
}
|
|
|
|
if (num == 0) {
|
|
size_t bufsize;
|
|
char *src;
|
|
|
|
bufsize = strlen(p->h_name) + 2 +
|
|
MAXADDRS * p->h_length +
|
|
ALIGNBYTES;
|
|
for (cp = p->h_aliases; *cp != NULL; cp++)
|
|
bufsize += strlen(*cp) + 1;
|
|
|
|
if ((tmpbuf = malloc(bufsize)) == NULL) {
|
|
h_errno = NETDB_INTERNAL;
|
|
return NULL;
|
|
}
|
|
|
|
ptr = tmpbuf;
|
|
src = p->h_name;
|
|
while ((*ptr++ = *src++) != '\0');
|
|
for (cp = p->h_aliases; *cp != NULL; cp++) {
|
|
src = *cp;
|
|
while ((*ptr++ = *src++) != '\0');
|
|
}
|
|
*ptr++ = '\0';
|
|
|
|
ptr = (char *)(void *)ALIGN(ptr);
|
|
}
|
|
|
|
(void)memcpy(ptr, p->h_addr_list[0], (size_t)p->h_length);
|
|
ptr += p->h_length;
|
|
num++;
|
|
}
|
|
_endhtent();
|
|
if (num == 0) return NULL;
|
|
|
|
len = ptr - tmpbuf;
|
|
if (len > (sizeof(hostbuf) - ALIGNBYTES)) {
|
|
free(tmpbuf);
|
|
errno = ENOSPC;
|
|
h_errno = NETDB_INTERNAL;
|
|
return NULL;
|
|
}
|
|
ptr = memcpy((void *)ALIGN(hostbuf), tmpbuf, len);
|
|
free(tmpbuf);
|
|
|
|
host.h_name = ptr;
|
|
while (*ptr++);
|
|
|
|
cp = host_aliases;
|
|
while (*ptr) {
|
|
*cp++ = ptr;
|
|
while (*ptr++);
|
|
}
|
|
ptr++;
|
|
*cp = NULL;
|
|
|
|
ptr = (char *)(void *)ALIGN(ptr);
|
|
cp = h_addr_ptrs;
|
|
while (num--) {
|
|
*cp++ = ptr;
|
|
ptr += host.h_length;
|
|
}
|
|
*cp = NULL;
|
|
|
|
return (&host);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
_gethtbyaddr(rv, cb_data, ap)
|
|
void *rv;
|
|
void *cb_data;
|
|
va_list ap;
|
|
{
|
|
struct hostent *p;
|
|
const unsigned char *addr;
|
|
int len, af;
|
|
|
|
_DIAGASSERT(rv != NULL);
|
|
|
|
addr = va_arg(ap, unsigned char *);
|
|
len = va_arg(ap, int);
|
|
af = va_arg(ap, int);
|
|
|
|
host.h_length = len;
|
|
host.h_addrtype = af;
|
|
|
|
_sethtent(0);
|
|
while ((p = _gethtent()) != NULL)
|
|
if (p->h_addrtype == af && !memcmp(p->h_addr, addr,
|
|
(size_t)len))
|
|
break;
|
|
_endhtent();
|
|
*((struct hostent **)rv) = p;
|
|
if (p==NULL) {
|
|
h_errno = HOST_NOT_FOUND;
|
|
return NS_NOTFOUND;
|
|
}
|
|
return NS_SUCCESS;
|
|
}
|
|
|
|
static void
|
|
map_v4v6_address(src, dst)
|
|
const char *src;
|
|
char *dst;
|
|
{
|
|
u_char *p = (u_char *)dst;
|
|
char tmp[INADDRSZ];
|
|
int i;
|
|
|
|
_DIAGASSERT(src != NULL);
|
|
_DIAGASSERT(dst != NULL);
|
|
|
|
/* Stash a temporary copy so our caller can update in place. */
|
|
(void)memcpy(tmp, src, INADDRSZ);
|
|
/* Mark this ipv6 addr as a mapped ipv4. */
|
|
for (i = 0; i < 10; i++)
|
|
*p++ = 0x00;
|
|
*p++ = 0xff;
|
|
*p++ = 0xff;
|
|
/* Retrieve the saved copy and we're done. */
|
|
(void)memcpy((void *)p, tmp, INADDRSZ);
|
|
}
|
|
|
|
static void
|
|
map_v4v6_hostent(hp, bpp, lenp)
|
|
struct hostent *hp;
|
|
char **bpp;
|
|
int *lenp;
|
|
{
|
|
char **ap;
|
|
|
|
_DIAGASSERT(hp != NULL);
|
|
_DIAGASSERT(bpp != NULL);
|
|
_DIAGASSERT(lenp != NULL);
|
|
|
|
if (hp->h_addrtype != AF_INET || hp->h_length != INADDRSZ)
|
|
return;
|
|
hp->h_addrtype = AF_INET6;
|
|
hp->h_length = IN6ADDRSZ;
|
|
for (ap = hp->h_addr_list; *ap; ap++) {
|
|
int i = sizeof(align) - (size_t)((u_long)*bpp % sizeof(align));
|
|
|
|
if (*lenp < (i + IN6ADDRSZ)) {
|
|
/* Out of memory. Truncate address list here. XXX */
|
|
*ap = NULL;
|
|
return;
|
|
}
|
|
*bpp += i;
|
|
*lenp -= i;
|
|
map_v4v6_address(*ap, *bpp);
|
|
*ap = *bpp;
|
|
*bpp += IN6ADDRSZ;
|
|
*lenp -= IN6ADDRSZ;
|
|
}
|
|
}
|
|
|
|
#ifdef RESOLVSORT
|
|
static void
|
|
addrsort(ap, num)
|
|
char **ap;
|
|
int num;
|
|
{
|
|
int i, j;
|
|
char **p;
|
|
short aval[MAXADDRS];
|
|
int needsort = 0;
|
|
|
|
_DIAGASSERT(ap != NULL);
|
|
|
|
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 *)(void *)(*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)
|
|
/* XXX: should we remove this cruft? - lukem */
|
|
/* 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, af)
|
|
const char *addr;
|
|
int len, af;
|
|
{
|
|
return (_gethtbyaddr(addr, len, af));
|
|
}
|
|
|
|
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*/
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
_dns_gethtbyname(rv, cb_data, ap)
|
|
void *rv;
|
|
void *cb_data;
|
|
va_list ap;
|
|
{
|
|
querybuf buf;
|
|
int n, type;
|
|
struct hostent *hp;
|
|
const char *name;
|
|
int af;
|
|
|
|
_DIAGASSERT(rv != NULL);
|
|
|
|
name = va_arg(ap, char *);
|
|
/* NOSTRICT skip len */(void)va_arg(ap, int);
|
|
af = va_arg(ap, int);
|
|
|
|
switch (af) {
|
|
case AF_INET:
|
|
type = T_A;
|
|
break;
|
|
case AF_INET6:
|
|
type = T_AAAA;
|
|
break;
|
|
default:
|
|
return NS_UNAVAIL;
|
|
}
|
|
if ((n = res_search(name, C_IN, type, buf.buf, sizeof(buf))) < 0) {
|
|
dprintf("res_search failed (%d)\n", n);
|
|
return NS_NOTFOUND;
|
|
}
|
|
hp = getanswer(&buf, n, name, type);
|
|
if (hp == NULL)
|
|
switch (h_errno) {
|
|
case HOST_NOT_FOUND:
|
|
return NS_NOTFOUND;
|
|
case TRY_AGAIN:
|
|
return NS_TRYAGAIN;
|
|
default:
|
|
return NS_UNAVAIL;
|
|
}
|
|
*((struct hostent **)rv) = hp;
|
|
return NS_SUCCESS;
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
_dns_gethtbyaddr(rv, cb_data, ap)
|
|
void *rv;
|
|
void *cb_data;
|
|
va_list ap;
|
|
{
|
|
char qbuf[MAXDNAME + 1], *qp;
|
|
int n;
|
|
querybuf buf;
|
|
struct hostent *hp;
|
|
const unsigned char *uaddr;
|
|
int len, af;
|
|
|
|
_DIAGASSERT(rv != NULL);
|
|
|
|
uaddr = va_arg(ap, unsigned char *);
|
|
len = va_arg(ap, int);
|
|
af = va_arg(ap, int);
|
|
|
|
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,
|
|
((unsigned int)uaddr[n] >> 4) & 0xf);
|
|
}
|
|
strcpy(qp, "ip6.int");
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
|
|
n = res_query(qbuf, C_IN, T_PTR, (u_char *)(void *)&buf, sizeof(buf));
|
|
if (n < 0) {
|
|
dprintf("res_query failed (%d)\n", n);
|
|
return NS_NOTFOUND;
|
|
}
|
|
hp = getanswer(&buf, n, qbuf, T_PTR);
|
|
if (hp == NULL)
|
|
switch (h_errno) {
|
|
case HOST_NOT_FOUND:
|
|
return NS_NOTFOUND;
|
|
case TRY_AGAIN:
|
|
return NS_TRYAGAIN;
|
|
default:
|
|
return NS_UNAVAIL;
|
|
}
|
|
hp->h_addrtype = af;
|
|
hp->h_length = len;
|
|
(void)memcpy(host_addr, uaddr, (size_t)len);
|
|
h_addr_ptrs[0] = (char *)(void *)host_addr;
|
|
h_addr_ptrs[1] = NULL;
|
|
if (af == AF_INET && (_res.options & RES_USE_INET6)) {
|
|
map_v4v6_address((char *)(void *)host_addr,
|
|
(char *)(void *)host_addr);
|
|
hp->h_addrtype = AF_INET6;
|
|
hp->h_length = IN6ADDRSZ;
|
|
}
|
|
|
|
*((struct hostent **)rv) = hp;
|
|
h_errno = NETDB_SUCCESS;
|
|
return NS_SUCCESS;
|
|
}
|
|
|
|
#ifdef YP
|
|
/*ARGSUSED*/
|
|
struct hostent *
|
|
_yphostent(line, af)
|
|
char *line;
|
|
int af;
|
|
{
|
|
static struct in_addr host_addrs[MAXADDRS];
|
|
char *p = line;
|
|
char *cp, **q;
|
|
char **hap;
|
|
struct in_addr *buf;
|
|
int more;
|
|
|
|
_DIAGASSERT(line != NULL);
|
|
|
|
host.h_name = NULL;
|
|
host.h_addr_list = h_addr_ptrs;
|
|
host.h_length = sizeof(u_int32_t);
|
|
host.h_addrtype = AF_INET;
|
|
hap = h_addr_ptrs;
|
|
buf = host_addrs;
|
|
q = host.h_aliases = host_aliases;
|
|
|
|
/*
|
|
* XXX: maybe support IPv6 parsing, based on 'af' setting
|
|
*/
|
|
nextline:
|
|
more = 0;
|
|
cp = strpbrk(p, " \t");
|
|
if (cp == NULL) {
|
|
if (host.h_name == NULL)
|
|
return (NULL);
|
|
else
|
|
goto done;
|
|
}
|
|
*cp++ = '\0';
|
|
|
|
*hap++ = (char *)(void *)buf;
|
|
(void) inet_aton(p, buf++);
|
|
|
|
while (*cp == ' ' || *cp == '\t')
|
|
cp++;
|
|
p = cp;
|
|
cp = strpbrk(p, " \t\n");
|
|
if (cp != NULL) {
|
|
if (*cp == '\n')
|
|
more = 1;
|
|
*cp++ = '\0';
|
|
}
|
|
if (!host.h_name)
|
|
host.h_name = p;
|
|
else if (strcmp(host.h_name, p)==0)
|
|
;
|
|
else if (q < &host_aliases[MAXALIASES - 1])
|
|
*q++ = p;
|
|
p = cp;
|
|
if (more)
|
|
goto nextline;
|
|
|
|
while (cp && *cp) {
|
|
if (*cp == ' ' || *cp == '\t') {
|
|
cp++;
|
|
continue;
|
|
}
|
|
if (*cp == '\n') {
|
|
cp++;
|
|
goto nextline;
|
|
}
|
|
if (q < &host_aliases[MAXALIASES - 1])
|
|
*q++ = cp;
|
|
cp = strpbrk(cp, " \t");
|
|
if (cp != NULL)
|
|
*cp++ = '\0';
|
|
}
|
|
done:
|
|
*q = NULL;
|
|
*hap = NULL;
|
|
return (&host);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
_yp_gethtbyaddr(rv, cb_data, ap)
|
|
void *rv;
|
|
void *cb_data;
|
|
va_list ap;
|
|
{
|
|
struct hostent *hp = (struct hostent *)NULL;
|
|
static char *__ypcurrent;
|
|
int __ypcurrentlen, r;
|
|
char name[sizeof("xxx.xxx.xxx.xxx") + 1];
|
|
const unsigned char *uaddr;
|
|
int af;
|
|
|
|
_DIAGASSERT(rv != NULL);
|
|
|
|
uaddr = va_arg(ap, unsigned char *);
|
|
/* NOSTRICT skip len */(void)va_arg(ap, int);
|
|
af = va_arg(ap, int);
|
|
|
|
if (!__ypdomain) {
|
|
if (_yp_check(&__ypdomain) == 0)
|
|
return NS_UNAVAIL;
|
|
}
|
|
/*
|
|
* XXX: based on the value of af, it would be possible to lookup
|
|
* IPv6 names in YP, by changing the following snprintf().
|
|
* Is it worth it?
|
|
*/
|
|
(void)snprintf(name, sizeof name, "%u.%u.%u.%u",
|
|
(uaddr[0] & 0xff),
|
|
(uaddr[1] & 0xff),
|
|
(uaddr[2] & 0xff),
|
|
(uaddr[3] & 0xff));
|
|
if (__ypcurrent)
|
|
free(__ypcurrent);
|
|
__ypcurrent = NULL;
|
|
r = yp_match(__ypdomain, "hosts.byaddr", name,
|
|
(int)strlen(name), &__ypcurrent, &__ypcurrentlen);
|
|
if (r==0)
|
|
hp = _yphostent(__ypcurrent, af);
|
|
if (hp==NULL) {
|
|
h_errno = HOST_NOT_FOUND;
|
|
return NS_NOTFOUND;
|
|
}
|
|
*((struct hostent **)rv) = hp;
|
|
return NS_SUCCESS;
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
_yp_gethtbyname(rv, cb_data, ap)
|
|
void *rv;
|
|
void *cb_data;
|
|
va_list ap;
|
|
{
|
|
struct hostent *hp = (struct hostent *)NULL;
|
|
static char *__ypcurrent;
|
|
int __ypcurrentlen, r;
|
|
const char *name;
|
|
int af;
|
|
|
|
_DIAGASSERT(rv != NULL);
|
|
|
|
name = va_arg(ap, char *);
|
|
/* NOSTRICT skip len */(void)va_arg(ap, int);
|
|
af = va_arg(ap, int);
|
|
|
|
if (!__ypdomain) {
|
|
if (_yp_check(&__ypdomain) == 0)
|
|
return NS_UNAVAIL;
|
|
}
|
|
if (__ypcurrent)
|
|
free(__ypcurrent);
|
|
__ypcurrent = NULL;
|
|
r = yp_match(__ypdomain, "hosts.byname", name,
|
|
(int)strlen(name), &__ypcurrent, &__ypcurrentlen);
|
|
if (r==0)
|
|
hp = _yphostent(__ypcurrent, af);
|
|
if (hp==NULL) {
|
|
h_errno = HOST_NOT_FOUND;
|
|
return NS_NOTFOUND;
|
|
}
|
|
*((struct hostent **)rv) = hp;
|
|
return NS_SUCCESS;
|
|
}
|
|
#endif
|