05c36511b9
be treated as NULL. PR: bin/19816 Submitted by: Bill Fenner <fenner@research.att.com> Reviewed by: Atsushi Onoe <onoe@sm.sony.co.jp>
1795 lines
42 KiB
C
1795 lines
42 KiB
C
/* $FreeBSD$ */
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/* $KAME: name6.c,v 1.25 2000/06/26 16:44:40 itojun Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, 1998, and 1999 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project 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 PROJECT 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 PROJECT 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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/*
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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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/*
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* Atsushi Onoe <onoe@sm.sony.co.jp>
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*/
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/*
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* TODO for thread safe
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* use mutex for _hostconf, _hostconf_init.
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* rewrite resolvers to be thread safe
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*/
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/queue.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 <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 <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#ifndef _PATH_HOSTS
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#define _PATH_HOSTS "/etc/hosts"
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#endif
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#ifndef MAXALIASES
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#define MAXALIASES 10
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#endif
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#ifndef MAXADDRS
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#define MAXADDRS 20
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#endif
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#ifndef MAXDNAME
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#define MAXDNAME 1025
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#endif
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#ifdef INET6
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#define ADDRLEN(af) ((af) == AF_INET6 ? sizeof(struct in6_addr) : \
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sizeof(struct in_addr))
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#else
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#define ADDRLEN(af) sizeof(struct in_addr)
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#endif
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#define MAPADDR(ab, ina) \
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do { \
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memcpy(&(ab)->map_inaddr, ina, sizeof(struct in_addr)); \
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memset((ab)->map_zero, 0, sizeof((ab)->map_zero)); \
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memset((ab)->map_one, 0xff, sizeof((ab)->map_one)); \
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} while (0)
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#define MAPADDRENABLED(flags) \
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(((flags) & AI_V4MAPPED) || \
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(((flags) & AI_V4MAPPED_CFG) && _mapped_addr_enabled()))
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union inx_addr {
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struct in_addr in_addr;
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#ifdef INET6
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struct in6_addr in6_addr;
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#endif
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struct {
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u_char mau_zero[10];
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u_char mau_one[2];
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struct in_addr mau_inaddr;
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} map_addr_un;
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#define map_zero map_addr_un.mau_zero
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#define map_one map_addr_un.mau_one
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#define map_inaddr map_addr_un.mau_inaddr
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};
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static struct hostent *_hpcopy(struct hostent *hp, int *errp);
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static struct hostent *_hpaddr(int af, const char *name, void *addr, int *errp);
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static struct hostent *_hpmerge(struct hostent *hp1, struct hostent *hp2, int *errp);
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#ifdef INET6
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static struct hostent *_hpmapv6(struct hostent *hp, int *errp);
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#endif
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static struct hostent *_hpsort(struct hostent *hp);
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static struct hostent *_ghbyname(const char *name, int af, int flags, int *errp);
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static char *_hgetword(char **pp);
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static int _mapped_addr_enabled(void);
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static FILE *_files_open(int *errp);
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static struct hostent *_files_ghbyname(const char *name, int af, int *errp);
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static struct hostent *_files_ghbyaddr(const void *addr, int addrlen, int af, int *errp);
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static void _files_shent(int stayopen);
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static void _files_ehent(void);
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#ifdef YP
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static struct hostent *_nis_ghbyname(const char *name, int af, int *errp);
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static struct hostent *_nis_ghbyaddr(const void *addr, int addrlen, int af, int *errp);
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#endif
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static struct hostent *_dns_ghbyname(const char *name, int af, int *errp);
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static struct hostent *_dns_ghbyaddr(const void *addr, int addrlen, int af, int *errp);
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static void _dns_shent(int stayopen);
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static void _dns_ehent(void);
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#ifdef ICMPNL
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static struct hostent *_icmp_ghbyaddr(const void *addr, int addrlen, int af, int *errp);
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#endif /* ICMPNL */
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/*
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* Select order host function.
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*/
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#define MAXHOSTCONF 4
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#ifndef HOSTCONF
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# define HOSTCONF "/etc/host.conf"
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#endif /* !HOSTCONF */
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struct _hostconf {
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struct hostent *(*byname)(const char *name, int af, int *errp);
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struct hostent *(*byaddr)(const void *addr, int addrlen, int af, int *errp);
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};
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/* default order */
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static struct _hostconf _hostconf[MAXHOSTCONF] = {
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{ _dns_ghbyname, _dns_ghbyaddr },
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{ _files_ghbyname, _files_ghbyaddr },
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#ifdef ICMPNL
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{ NULL, _icmp_ghbyaddr },
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#endif /* ICMPNL */
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};
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static int _hostconf_init_done;
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static void _hostconf_init(void);
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/*
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* Initialize hostconf structure.
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*/
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static void
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_hostconf_init(void)
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{
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FILE *fp;
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int n;
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char *p, *line;
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char buf[BUFSIZ];
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_hostconf_init_done = 1;
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n = 0;
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p = HOSTCONF;
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if ((fp = fopen(p, "r")) == NULL)
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return;
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while (n < MAXHOSTCONF && fgets(buf, sizeof(buf), fp)) {
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line = buf;
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if ((p = _hgetword(&line)) == NULL)
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continue;
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do {
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if (strcmp(p, "hosts") == 0
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|| strcmp(p, "local") == 0
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|| strcmp(p, "file") == 0
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|| strcmp(p, "files") == 0) {
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_hostconf[n].byname = _files_ghbyname;
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_hostconf[n].byaddr = _files_ghbyaddr;
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n++;
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}
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else if (strcmp(p, "dns") == 0
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|| strcmp(p, "bind") == 0) {
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_hostconf[n].byname = _dns_ghbyname;
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_hostconf[n].byaddr = _dns_ghbyaddr;
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n++;
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}
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#ifdef YP
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else if (strcmp(p, "nis") == 0) {
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_hostconf[n].byname = _nis_ghbyname;
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_hostconf[n].byaddr = _nis_ghbyaddr;
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n++;
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}
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#endif
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#ifdef ICMPNL
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else if (strcmp(p, "icmp") == 0) {
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_hostconf[n].byname = NULL;
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_hostconf[n].byaddr = _icmp_ghbyaddr;
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n++;
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}
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#endif /* ICMPNL */
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} while ((p = _hgetword(&line)) != NULL);
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}
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fclose(fp);
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if (n < 0) {
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/* no keyword found. do not change default configuration */
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return;
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}
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for (; n < MAXHOSTCONF; n++) {
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_hostconf[n].byname = NULL;
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_hostconf[n].byaddr = NULL;
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}
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}
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/*
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* Check if kernel supports mapped address.
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* implementation dependent
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*/
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#ifdef __KAME__
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#include <sys/sysctl.h>
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#endif /* __KAME__ */
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static int
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_mapped_addr_enabled(void)
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{
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/* implementation dependent check */
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#if defined(__KAME__) && defined(IPV6CTL_MAPPED_ADDR)
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int mib[4];
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size_t len;
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int val;
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mib[0] = CTL_NET;
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mib[1] = PF_INET6;
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mib[2] = IPPROTO_IPV6;
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mib[3] = IPV6CTL_MAPPED_ADDR;
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len = sizeof(val);
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if (sysctl(mib, 4, &val, &len, 0, 0) == 0 && val != 0)
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return 1;
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#endif /* __KAME__ && IPV6CTL_MAPPED_ADDR */
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return 0;
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}
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/*
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* Functions defined in RFC2553
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* getipnodebyname, getipnodebyaddr, freehostent
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*/
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static struct hostent *
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_ghbyname(const char *name, int af, int flags, int *errp)
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{
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struct hostent *hp;
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int i;
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if (flags & AI_ADDRCONFIG) {
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int s;
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/*
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* TODO:
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* Note that implementation dependent test for address
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* configuration should be done everytime called
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* (or apropriate interval),
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* because addresses will be dynamically assigned or deleted.
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*/
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if (af == AF_UNSPEC) {
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if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
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af = AF_INET;
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else {
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_close(s);
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if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
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af = AF_INET6;
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else
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_close(s);
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}
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}
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if (af != AF_UNSPEC) {
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if ((s = socket(af, SOCK_DGRAM, 0)) < 0)
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return NULL;
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_close(s);
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}
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}
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for (i = 0; i < MAXHOSTCONF; i++) {
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if (_hostconf[i].byname
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&& (hp = (*_hostconf[i].byname)(name, af, errp)) != NULL)
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return hp;
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}
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return NULL;
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}
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/* getipnodebyname() internal routine for multiple query(PF_UNSPEC) support. */
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struct hostent *
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_getipnodebyname_multi(const char *name, int af, int flags, int *errp)
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{
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struct hostent *hp;
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union inx_addr addrbuf;
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/* XXX: PF_UNSPEC is only supposed to be passed from getaddrinfo() */
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if (af != AF_INET
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#ifdef INET6
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&& af != AF_INET6
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#endif
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&& af != PF_UNSPEC
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)
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{
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*errp = NO_RECOVERY;
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return NULL;
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}
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#ifdef INET6
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/* special case for literal address */
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if (inet_pton(AF_INET6, name, &addrbuf) == 1) {
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if (af != AF_INET6) {
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*errp = HOST_NOT_FOUND;
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return NULL;
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}
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return _hpaddr(af, name, &addrbuf, errp);
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}
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#endif
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if (inet_aton(name, (struct in_addr *)&addrbuf) == 1) {
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if (af != AF_INET) {
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if (MAPADDRENABLED(flags)) {
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MAPADDR(&addrbuf, &addrbuf.in_addr);
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} else {
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*errp = HOST_NOT_FOUND;
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return NULL;
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}
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}
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return _hpaddr(af, name, &addrbuf, errp);
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}
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if (!_hostconf_init_done)
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_hostconf_init();
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*errp = HOST_NOT_FOUND;
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hp = _ghbyname(name, af, flags, errp);
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#ifdef INET6
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if (af == AF_INET6
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&& ((flags & AI_ALL) || hp == NULL)
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&& (MAPADDRENABLED(flags))) {
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struct hostent *hp2 = _ghbyname(name, AF_INET, flags, errp);
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if (hp == NULL)
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hp = _hpmapv6(hp2, errp);
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else {
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if (hp2 && strcmp(hp->h_name, hp2->h_name) != 0) {
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freehostent(hp2);
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hp2 = NULL;
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}
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hp = _hpmerge(hp, hp2, errp);
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}
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}
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#endif
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return _hpsort(hp);
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}
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struct hostent *
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getipnodebyname(const char *name, int af, int flags, int *errp)
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{
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if (af != AF_INET
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#ifdef INET6
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&& af != AF_INET6
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#endif
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)
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{
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*errp = NO_RECOVERY;
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return NULL;
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}
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return(_getipnodebyname_multi(name, af ,flags, errp));
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}
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|
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struct hostent *
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getipnodebyaddr(const void *src, size_t len, int af, int *errp)
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{
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struct hostent *hp;
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int i;
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#ifdef INET6
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struct in6_addr addrbuf;
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#else
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struct in_addr addrbuf;
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#endif
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*errp = HOST_NOT_FOUND;
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|
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switch (af) {
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case AF_INET:
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if (len != sizeof(struct in_addr)) {
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*errp = NO_RECOVERY;
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return NULL;
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}
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if ((long)src & ~(sizeof(struct in_addr) - 1)) {
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memcpy(&addrbuf, src, len);
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src = &addrbuf;
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}
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if (((struct in_addr *)src)->s_addr == 0)
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return NULL;
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break;
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#ifdef INET6
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case AF_INET6:
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if (len != sizeof(struct in6_addr)) {
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*errp = NO_RECOVERY;
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return NULL;
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}
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if ((long)src & ~(sizeof(struct in6_addr) / 2 - 1)) { /*XXX*/
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memcpy(&addrbuf, src, len);
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src = &addrbuf;
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}
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if (IN6_IS_ADDR_UNSPECIFIED((struct in6_addr *)src))
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return NULL;
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if (IN6_IS_ADDR_V4MAPPED((struct in6_addr *)src)
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|| IN6_IS_ADDR_V4COMPAT((struct in6_addr *)src)) {
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src = (char *)src +
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(sizeof(struct in6_addr) - sizeof(struct in_addr));
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af = AF_INET;
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len = sizeof(struct in_addr);
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}
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break;
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#endif
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default:
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*errp = NO_RECOVERY;
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return NULL;
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}
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|
|
if (!_hostconf_init_done)
|
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_hostconf_init();
|
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for (i = 0; i < MAXHOSTCONF; i++) {
|
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if (_hostconf[i].byaddr
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&& (hp = (*_hostconf[i].byaddr)(src, len, af, errp)) != NULL)
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return hp;
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}
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return NULL;
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}
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|
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void
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freehostent(struct hostent *ptr)
|
|
{
|
|
free(ptr);
|
|
}
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|
|
#if 0
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|
|
|
/* XXX: should be deprecated */
|
|
struct hostent *
|
|
getnodebyname(const char *name, int af, int flags)
|
|
{
|
|
return getipnodebyname(name, af, flags, &h_errno);
|
|
}
|
|
|
|
#ifdef __warn_references
|
|
__warn_references(getnodebyname,
|
|
"warning: getnodebyname() deprecated, "
|
|
"should use getaddrinfo() or getipnodebyname()");
|
|
#endif
|
|
|
|
struct hostent *
|
|
getnodebyaddr(const void *src, size_t len, int af)
|
|
{
|
|
return getipnodebyaddr(src, len, af, &h_errno);
|
|
}
|
|
|
|
#ifdef __warn_references
|
|
__warn_references(getnodebyaddr,
|
|
"warning: getnodebyaddr() deprecated, "
|
|
"should use getnameinfo() or getipnodebyaddr()");
|
|
#endif
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Private utility functions
|
|
*/
|
|
|
|
/*
|
|
* _hpcopy: allocate and copy hostent structure
|
|
*/
|
|
static struct hostent *
|
|
_hpcopy(struct hostent *hp, int *errp)
|
|
{
|
|
struct hostent *nhp;
|
|
char *cp, **pp;
|
|
int size, addrsize;
|
|
int nalias = 0, naddr = 0;
|
|
int al_off;
|
|
int i;
|
|
|
|
if (hp == NULL)
|
|
return hp;
|
|
|
|
/* count size to be allocated */
|
|
size = sizeof(struct hostent);
|
|
if (hp->h_name != NULL)
|
|
size += strlen(hp->h_name) + 1;
|
|
if ((pp = hp->h_aliases) != NULL) {
|
|
for (i = 0; *pp != NULL; i++, pp++) {
|
|
if (**pp != '\0') {
|
|
size += strlen(*pp) + 1;
|
|
nalias++;
|
|
}
|
|
}
|
|
}
|
|
/* adjust alignment */
|
|
size = ALIGN(size);
|
|
al_off = size;
|
|
size += sizeof(char *) * (nalias + 1);
|
|
addrsize = ALIGN(hp->h_length);
|
|
if ((pp = hp->h_addr_list) != NULL) {
|
|
while (*pp++ != NULL)
|
|
naddr++;
|
|
}
|
|
size += addrsize * naddr;
|
|
size += sizeof(char *) * (naddr + 1);
|
|
|
|
/* copy */
|
|
if ((nhp = (struct hostent *)malloc(size)) == NULL) {
|
|
*errp = TRY_AGAIN;
|
|
return NULL;
|
|
}
|
|
cp = (char *)&nhp[1];
|
|
if (hp->h_name != NULL) {
|
|
nhp->h_name = cp;
|
|
strcpy(cp, hp->h_name);
|
|
cp += strlen(cp) + 1;
|
|
} else
|
|
nhp->h_name = NULL;
|
|
nhp->h_aliases = (char **)((char *)nhp + al_off);
|
|
if ((pp = hp->h_aliases) != NULL) {
|
|
for (i = 0; *pp != NULL; pp++) {
|
|
if (**pp != '\0') {
|
|
nhp->h_aliases[i++] = cp;
|
|
strcpy(cp, *pp);
|
|
cp += strlen(cp) + 1;
|
|
}
|
|
}
|
|
}
|
|
nhp->h_aliases[nalias] = NULL;
|
|
cp = (char *)&nhp->h_aliases[nalias + 1];
|
|
nhp->h_addrtype = hp->h_addrtype;
|
|
nhp->h_length = hp->h_length;
|
|
nhp->h_addr_list = (char **)cp;
|
|
if ((pp = hp->h_addr_list) != NULL) {
|
|
cp = (char *)&nhp->h_addr_list[naddr + 1];
|
|
for (i = 0; *pp != NULL; pp++) {
|
|
nhp->h_addr_list[i++] = cp;
|
|
memcpy(cp, *pp, hp->h_length);
|
|
cp += addrsize;
|
|
}
|
|
}
|
|
nhp->h_addr_list[naddr] = NULL;
|
|
return nhp;
|
|
}
|
|
|
|
/*
|
|
* _hpaddr: construct hostent structure with one address
|
|
*/
|
|
static struct hostent *
|
|
_hpaddr(int af, const char *name, void *addr, int *errp)
|
|
{
|
|
struct hostent *hp, hpbuf;
|
|
char *addrs[2];
|
|
|
|
hp = &hpbuf;
|
|
hp->h_name = (char *)name;
|
|
hp->h_aliases = NULL;
|
|
hp->h_addrtype = af;
|
|
hp->h_length = ADDRLEN(af);
|
|
hp->h_addr_list = addrs;
|
|
addrs[0] = (char *)addr;
|
|
addrs[1] = NULL;
|
|
return _hpcopy(hp, errp);
|
|
}
|
|
|
|
/*
|
|
* _hpmerge: merge 2 hostent structure, arguments will be freed
|
|
*/
|
|
static struct hostent *
|
|
_hpmerge(struct hostent *hp1, struct hostent *hp2, int *errp)
|
|
{
|
|
int i, j;
|
|
int naddr, nalias;
|
|
char **pp;
|
|
struct hostent *hp, hpbuf;
|
|
char *aliases[MAXALIASES + 1], *addrs[MAXADDRS + 1];
|
|
union inx_addr addrbuf[MAXADDRS];
|
|
|
|
if (hp1 == NULL)
|
|
return hp2;
|
|
if (hp2 == NULL)
|
|
return hp1;
|
|
|
|
#define HP(i) (i == 1 ? hp1 : hp2)
|
|
hp = &hpbuf;
|
|
hp->h_name = (hp1->h_name != NULL ? hp1->h_name : hp2->h_name);
|
|
hp->h_aliases = aliases;
|
|
nalias = 0;
|
|
for (i = 1; i <= 2; i++) {
|
|
if ((pp = HP(i)->h_aliases) == NULL)
|
|
continue;
|
|
for (; nalias < MAXALIASES && *pp != NULL; pp++) {
|
|
/* check duplicates */
|
|
for (j = 0; j < nalias; j++)
|
|
if (strcasecmp(*pp, aliases[j]) == 0)
|
|
break;
|
|
if (j == nalias)
|
|
aliases[nalias++] = *pp;
|
|
}
|
|
}
|
|
aliases[nalias] = NULL;
|
|
#ifdef INET6
|
|
if (hp1->h_length != hp2->h_length) {
|
|
hp->h_addrtype = AF_INET6;
|
|
hp->h_length = sizeof(struct in6_addr);
|
|
} else {
|
|
#endif
|
|
hp->h_addrtype = hp1->h_addrtype;
|
|
hp->h_length = hp1->h_length;
|
|
#ifdef INET6
|
|
}
|
|
#endif
|
|
hp->h_addr_list = addrs;
|
|
naddr = 0;
|
|
for (i = 1; i <= 2; i++) {
|
|
if ((pp = HP(i)->h_addr_list) == NULL)
|
|
continue;
|
|
if (HP(i)->h_length == hp->h_length) {
|
|
while (naddr < MAXADDRS && *pp != NULL)
|
|
addrs[naddr++] = *pp++;
|
|
} else {
|
|
/* copy IPv4 addr as mapped IPv6 addr */
|
|
while (naddr < MAXADDRS && *pp != NULL) {
|
|
MAPADDR(&addrbuf[naddr], *pp++);
|
|
addrs[naddr] = (char *)&addrbuf[naddr];
|
|
naddr++;
|
|
}
|
|
}
|
|
}
|
|
addrs[naddr] = NULL;
|
|
hp = _hpcopy(hp, errp);
|
|
freehostent(hp1);
|
|
freehostent(hp2);
|
|
return hp;
|
|
}
|
|
|
|
/*
|
|
* _hpmapv6: convert IPv4 hostent into IPv4-mapped IPv6 addresses
|
|
*/
|
|
#ifdef INET6
|
|
static struct hostent *
|
|
_hpmapv6(struct hostent *hp, int *errp)
|
|
{
|
|
struct hostent *hp6;
|
|
|
|
if (hp == NULL)
|
|
return NULL;
|
|
if (hp->h_addrtype == AF_INET6)
|
|
return hp;
|
|
|
|
/* make dummy hostent to convert IPv6 address */
|
|
if ((hp6 = (struct hostent *)malloc(sizeof(struct hostent))) == NULL) {
|
|
*errp = TRY_AGAIN;
|
|
return NULL;
|
|
}
|
|
hp6->h_name = NULL;
|
|
hp6->h_aliases = NULL;
|
|
hp6->h_addrtype = AF_INET6;
|
|
hp6->h_length = sizeof(struct in6_addr);
|
|
hp6->h_addr_list = NULL;
|
|
return _hpmerge(hp6, hp, errp);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* _hpsort: sort address by sortlist
|
|
*/
|
|
static struct hostent *
|
|
_hpsort(struct hostent *hp)
|
|
{
|
|
int i, j, n;
|
|
u_char *ap, *sp, *mp, **pp;
|
|
char t;
|
|
char order[MAXADDRS];
|
|
int nsort = _res.nsort;
|
|
|
|
if (hp == NULL || hp->h_addr_list[1] == NULL || nsort == 0)
|
|
return hp;
|
|
for (i = 0; (ap = (u_char *)hp->h_addr_list[i]); i++) {
|
|
for (j = 0; j < nsort; j++) {
|
|
#ifdef INET6
|
|
if (_res_ext.sort_list[j].af != hp->h_addrtype)
|
|
continue;
|
|
sp = (u_char *)&_res_ext.sort_list[j].addr;
|
|
mp = (u_char *)&_res_ext.sort_list[j].mask;
|
|
#else
|
|
sp = (u_char *)&_res.sort_list[j].addr;
|
|
mp = (u_char *)&_res.sort_list[j].mask;
|
|
#endif
|
|
for (n = 0; n < hp->h_length; n++) {
|
|
if ((ap[n] & mp[n]) != sp[n])
|
|
break;
|
|
}
|
|
if (n == hp->h_length)
|
|
break;
|
|
}
|
|
order[i] = j;
|
|
}
|
|
n = i;
|
|
pp = (u_char **)hp->h_addr_list;
|
|
for (i = 0; i < n - 1; i++) {
|
|
for (j = i + 1; j < n; j++) {
|
|
if (order[i] > order[j]) {
|
|
ap = pp[i];
|
|
pp[i] = pp[j];
|
|
pp[j] = ap;
|
|
t = order[i];
|
|
order[i] = order[j];
|
|
order[j] = t;
|
|
}
|
|
}
|
|
}
|
|
return hp;
|
|
}
|
|
|
|
static char *
|
|
_hgetword(char **pp)
|
|
{
|
|
char c, *p, *ret;
|
|
const char *sp;
|
|
static const char sep[] = "# \t\n";
|
|
|
|
ret = NULL;
|
|
for (p = *pp; (c = *p) != '\0'; p++) {
|
|
for (sp = sep; *sp != '\0'; sp++) {
|
|
if (c == *sp)
|
|
break;
|
|
}
|
|
if (c == '#')
|
|
p[1] = '\0'; /* ignore rest of line */
|
|
if (ret == NULL) {
|
|
if (*sp == '\0')
|
|
ret = p;
|
|
} else {
|
|
if (*sp != '\0') {
|
|
*p++ = '\0';
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
*pp = p;
|
|
if (ret == NULL || *ret == '\0')
|
|
return NULL;
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* FILES (/etc/hosts)
|
|
*/
|
|
|
|
static FILE *
|
|
_files_open(int *errp)
|
|
{
|
|
FILE *fp;
|
|
fp = fopen(_PATH_HOSTS, "r");
|
|
if (fp == NULL)
|
|
*errp = NO_RECOVERY;
|
|
return fp;
|
|
}
|
|
|
|
static struct hostent *
|
|
_files_ghbyname(const char *name, int af, int *errp)
|
|
{
|
|
int match, nalias;
|
|
char *p, *line, *addrstr, *cname;
|
|
FILE *fp;
|
|
struct hostent *rethp, *hp, hpbuf;
|
|
char *aliases[MAXALIASES + 1], *addrs[2];
|
|
union inx_addr addrbuf;
|
|
char buf[BUFSIZ];
|
|
int af0 = af;
|
|
|
|
if ((fp = _files_open(errp)) == NULL)
|
|
return NULL;
|
|
rethp = hp = NULL;
|
|
|
|
while (fgets(buf, sizeof(buf), fp)) {
|
|
line = buf;
|
|
if ((addrstr = _hgetword(&line)) == NULL
|
|
|| (cname = _hgetword(&line)) == NULL)
|
|
continue;
|
|
match = (strcasecmp(cname, name) == 0);
|
|
nalias = 0;
|
|
while ((p = _hgetword(&line)) != NULL) {
|
|
if (!match)
|
|
match = (strcasecmp(p, name) == 0);
|
|
if (nalias < MAXALIASES)
|
|
aliases[nalias++] = p;
|
|
}
|
|
if (!match)
|
|
continue;
|
|
switch (af0) {
|
|
case AF_INET:
|
|
if (inet_aton(addrstr, (struct in_addr *)&addrbuf)
|
|
!= 1) {
|
|
*errp = NO_DATA; /* name found */
|
|
continue;
|
|
}
|
|
af = af0;
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
if (inet_pton(af, addrstr, &addrbuf) != 1) {
|
|
*errp = NO_DATA; /* name found */
|
|
continue;
|
|
}
|
|
af = af0;
|
|
break;
|
|
#endif
|
|
case AF_UNSPEC:
|
|
if (inet_aton(addrstr, (struct in_addr *)&addrbuf)
|
|
== 1) {
|
|
af = AF_INET;
|
|
break;
|
|
}
|
|
#ifdef INET6
|
|
if (inet_pton(AF_INET6, addrstr, &addrbuf) == 1) {
|
|
af = AF_INET6;
|
|
break;
|
|
}
|
|
#endif
|
|
*errp = NO_DATA; /* name found */
|
|
continue;
|
|
/* NOTREACHED */
|
|
}
|
|
hp = &hpbuf;
|
|
hp->h_name = cname;
|
|
hp->h_aliases = aliases;
|
|
aliases[nalias] = NULL;
|
|
hp->h_addrtype = af;
|
|
hp->h_length = ADDRLEN(af);
|
|
hp->h_addr_list = addrs;
|
|
addrs[0] = (char *)&addrbuf;
|
|
addrs[1] = NULL;
|
|
hp = _hpcopy(hp, errp);
|
|
rethp = _hpmerge(rethp, hp, errp);
|
|
}
|
|
fclose(fp);
|
|
return rethp;
|
|
}
|
|
|
|
static struct hostent *
|
|
_files_ghbyaddr(const void *addr, int addrlen, int af, int *errp)
|
|
{
|
|
int nalias;
|
|
char *p, *line;
|
|
FILE *fp;
|
|
struct hostent *hp, hpbuf;
|
|
char *aliases[MAXALIASES + 1], *addrs[2];
|
|
union inx_addr addrbuf;
|
|
char buf[BUFSIZ];
|
|
|
|
if ((fp = _files_open(errp)) == NULL)
|
|
return NULL;
|
|
hp = NULL;
|
|
while (fgets(buf, sizeof(buf), fp)) {
|
|
line = buf;
|
|
if ((p = _hgetword(&line)) == NULL
|
|
|| (af == AF_INET
|
|
? inet_aton(p, (struct in_addr *)&addrbuf)
|
|
: inet_pton(af, p, &addrbuf)) != 1
|
|
|| memcmp(addr, &addrbuf, addrlen) != 0
|
|
|| (p = _hgetword(&line)) == NULL)
|
|
continue;
|
|
hp = &hpbuf;
|
|
hp->h_name = p;
|
|
hp->h_aliases = aliases;
|
|
nalias = 0;
|
|
while ((p = _hgetword(&line)) != NULL) {
|
|
if (nalias < MAXALIASES)
|
|
aliases[nalias++] = p;
|
|
}
|
|
aliases[nalias] = NULL;
|
|
hp->h_addrtype = af;
|
|
hp->h_length = addrlen;
|
|
hp->h_addr_list = addrs;
|
|
addrs[0] = (char *)&addrbuf;
|
|
addrs[1] = NULL;
|
|
hp = _hpcopy(hp, errp);
|
|
break;
|
|
}
|
|
fclose(fp);
|
|
return hp;
|
|
}
|
|
|
|
#ifdef YP
|
|
/*
|
|
* NIS
|
|
*
|
|
* XXX actually a hack, these are INET4 specific.
|
|
*/
|
|
static struct hostent *
|
|
_nis_ghbyname(const char *name, int af, int *errp)
|
|
{
|
|
struct hostent *hp = NULL;
|
|
|
|
if (af == AF_UNSPEC)
|
|
af = AF_INET;
|
|
if (af == AF_INET) {
|
|
hp = _gethostbynisname(name, af);
|
|
if (hp != NULL)
|
|
hp = _hpcopy(hp, errp);
|
|
}
|
|
return (hp);
|
|
|
|
}
|
|
|
|
static struct hostent *
|
|
_nis_ghbyaddr(const void *addr, int addrlen, int af, int *errp)
|
|
{
|
|
struct hostent *hp = NULL;
|
|
|
|
if (af == AF_INET) {
|
|
hp = _gethostbynisaddr(addr, addrlen, af);
|
|
if (hp != NULL)
|
|
hp = _hpcopy(hp, errp);
|
|
}
|
|
return (hp);
|
|
}
|
|
#endif
|
|
|
|
struct __res_type_list {
|
|
SLIST_ENTRY(__res_type_list) rtl_entry;
|
|
int rtl_type;
|
|
};
|
|
|
|
#if PACKETSZ > 1024
|
|
#define MAXPACKET PACKETSZ
|
|
#else
|
|
#define MAXPACKET 1024
|
|
#endif
|
|
|
|
typedef union {
|
|
HEADER hdr;
|
|
u_char buf[MAXPACKET];
|
|
} querybuf;
|
|
|
|
static struct hostent *getanswer __P((const querybuf *, int, const char *,
|
|
int, struct hostent *, int *));
|
|
|
|
/*
|
|
* we don't need to take care about sorting, nor IPv4 mapped address here.
|
|
*/
|
|
static struct hostent *
|
|
getanswer(answer, anslen, qname, qtype, template, errp)
|
|
const querybuf *answer;
|
|
int anslen;
|
|
const char *qname;
|
|
int qtype;
|
|
struct hostent *template;
|
|
int *errp;
|
|
{
|
|
register const HEADER *hp;
|
|
register const u_char *cp;
|
|
register int n;
|
|
const u_char *eom, *erdata;
|
|
char *bp, **ap, **hap;
|
|
int type, class, buflen, ancount, qdcount;
|
|
int haveanswer, had_error;
|
|
char tbuf[MAXDNAME];
|
|
const char *tname;
|
|
int (*name_ok) __P((const char *));
|
|
static char *h_addr_ptrs[MAXADDRS + 1];
|
|
static char *host_aliases[MAXALIASES];
|
|
static char hostbuf[8*1024];
|
|
|
|
#define BOUNDED_INCR(x) \
|
|
do { \
|
|
cp += x; \
|
|
if (cp > eom) { \
|
|
*errp = NO_RECOVERY; \
|
|
return (NULL); \
|
|
} \
|
|
} while (0)
|
|
|
|
#define BOUNDS_CHECK(ptr, count) \
|
|
do { \
|
|
if ((ptr) + (count) > eom) { \
|
|
*errp = NO_RECOVERY; \
|
|
return (NULL); \
|
|
} \
|
|
} while (0)
|
|
|
|
/* XXX do {} while (0) cannot be put here */
|
|
#define DNS_ASSERT(x) \
|
|
{ \
|
|
if (!(x)) { \
|
|
cp += n; \
|
|
continue; \
|
|
} \
|
|
}
|
|
|
|
/* XXX do {} while (0) cannot be put here */
|
|
#define DNS_FATAL(x) \
|
|
{ \
|
|
if (!(x)) { \
|
|
had_error++; \
|
|
continue; \
|
|
} \
|
|
}
|
|
|
|
tname = qname;
|
|
template->h_name = NULL;
|
|
eom = answer->buf + anslen;
|
|
switch (qtype) {
|
|
case T_A:
|
|
case T_AAAA:
|
|
name_ok = res_hnok;
|
|
break;
|
|
case T_PTR:
|
|
name_ok = res_dnok;
|
|
break;
|
|
default:
|
|
return (NULL); /* XXX should be abort(); */
|
|
}
|
|
/*
|
|
* find first satisfactory answer
|
|
*/
|
|
hp = &answer->hdr;
|
|
ancount = ntohs(hp->ancount);
|
|
qdcount = ntohs(hp->qdcount);
|
|
bp = hostbuf;
|
|
buflen = sizeof hostbuf;
|
|
cp = answer->buf;
|
|
BOUNDED_INCR(HFIXEDSZ);
|
|
if (qdcount != 1) {
|
|
*errp = NO_RECOVERY;
|
|
return (NULL);
|
|
}
|
|
n = dn_expand(answer->buf, eom, cp, bp, buflen);
|
|
if ((n < 0) || !(*name_ok)(bp)) {
|
|
*errp = NO_RECOVERY;
|
|
return (NULL);
|
|
}
|
|
BOUNDED_INCR(n + QFIXEDSZ);
|
|
if (qtype == T_A || qtype == T_AAAA) {
|
|
/* res_send() has already verified that the query name is the
|
|
* same as the one we sent; this just gets the expanded name
|
|
* (i.e., with the succeeding search-domain tacked on).
|
|
*/
|
|
n = strlen(bp) + 1; /* for the \0 */
|
|
if (n >= MAXHOSTNAMELEN) {
|
|
*errp = NO_RECOVERY;
|
|
return (NULL);
|
|
}
|
|
template->h_name = bp;
|
|
bp += n;
|
|
buflen -= n;
|
|
/* The qname can be abbreviated, but h_name is now absolute. */
|
|
qname = template->h_name;
|
|
}
|
|
ap = host_aliases;
|
|
*ap = NULL;
|
|
template->h_aliases = host_aliases;
|
|
hap = h_addr_ptrs;
|
|
*hap = NULL;
|
|
template->h_addr_list = h_addr_ptrs;
|
|
haveanswer = 0;
|
|
had_error = 0;
|
|
while (ancount-- > 0 && cp < eom && !had_error) {
|
|
n = dn_expand(answer->buf, eom, cp, bp, buflen);
|
|
DNS_FATAL(n >= 0);
|
|
DNS_FATAL((*name_ok)(bp));
|
|
cp += n; /* name */
|
|
BOUNDS_CHECK(cp, 3 * INT16SZ + INT32SZ);
|
|
type = _getshort(cp);
|
|
cp += INT16SZ; /* type */
|
|
class = _getshort(cp);
|
|
cp += INT16SZ + INT32SZ; /* class, TTL */
|
|
n = _getshort(cp);
|
|
cp += INT16SZ; /* len */
|
|
BOUNDS_CHECK(cp, n);
|
|
erdata = cp + n;
|
|
DNS_ASSERT(class == C_IN);
|
|
if ((qtype == T_A || qtype == T_AAAA) && type == T_CNAME) {
|
|
if (ap >= &host_aliases[MAXALIASES-1])
|
|
continue;
|
|
n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
|
|
DNS_FATAL(n >= 0);
|
|
DNS_FATAL((*name_ok)(tbuf));
|
|
cp += n;
|
|
if (cp != erdata) {
|
|
*errp = NO_RECOVERY;
|
|
return (NULL);
|
|
}
|
|
/* Store alias. */
|
|
*ap++ = bp;
|
|
n = strlen(bp) + 1; /* for the \0 */
|
|
DNS_FATAL(n < MAXHOSTNAMELEN);
|
|
bp += n;
|
|
buflen -= n;
|
|
/* Get canonical name. */
|
|
n = strlen(tbuf) + 1; /* for the \0 */
|
|
DNS_FATAL(n <= buflen);
|
|
DNS_FATAL(n < MAXHOSTNAMELEN);
|
|
strcpy(bp, tbuf);
|
|
template->h_name = bp;
|
|
bp += n;
|
|
buflen -= n;
|
|
continue;
|
|
}
|
|
if (qtype == T_PTR && type == T_CNAME) {
|
|
n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
|
|
if (n < 0 || !res_dnok(tbuf)) {
|
|
had_error++;
|
|
continue;
|
|
}
|
|
cp += n;
|
|
if (cp != erdata) {
|
|
*errp = NO_RECOVERY;
|
|
return (NULL);
|
|
}
|
|
/* Get canonical name. */
|
|
n = strlen(tbuf) + 1; /* for the \0 */
|
|
if (n > buflen || n >= MAXHOSTNAMELEN) {
|
|
had_error++;
|
|
continue;
|
|
}
|
|
strcpy(bp, tbuf);
|
|
tname = bp;
|
|
bp += n;
|
|
buflen -= n;
|
|
continue;
|
|
}
|
|
DNS_ASSERT(type == qtype);
|
|
switch (type) {
|
|
case T_PTR:
|
|
DNS_ASSERT(strcasecmp(tname, bp) == 0);
|
|
n = dn_expand(answer->buf, eom, cp, bp, buflen);
|
|
DNS_FATAL(n >= 0);
|
|
DNS_FATAL(res_hnok(bp));
|
|
#if MULTI_PTRS_ARE_ALIASES
|
|
cp += n;
|
|
if (cp != erdata) {
|
|
*errp = NO_RECOVERY;
|
|
return (NULL);
|
|
}
|
|
if (!haveanswer)
|
|
template->h_name = bp;
|
|
else if (ap < &host_aliases[MAXALIASES-1])
|
|
*ap++ = bp;
|
|
else
|
|
n = -1;
|
|
if (n != -1) {
|
|
n = strlen(bp) + 1; /* for the \0 */
|
|
if (n >= MAXHOSTNAMELEN) {
|
|
had_error++;
|
|
break;
|
|
}
|
|
bp += n;
|
|
buflen -= n;
|
|
}
|
|
break;
|
|
#else
|
|
template->h_name = bp;
|
|
*errp = NETDB_SUCCESS;
|
|
return (template);
|
|
#endif
|
|
case T_A:
|
|
case T_AAAA:
|
|
DNS_ASSERT(strcasecmp(template->h_name, bp) == 0);
|
|
DNS_ASSERT(n == template->h_length);
|
|
if (!haveanswer) {
|
|
register int nn;
|
|
|
|
template->h_name = bp;
|
|
nn = strlen(bp) + 1; /* for the \0 */
|
|
bp += nn;
|
|
buflen -= nn;
|
|
}
|
|
bp = (char *)ALIGN(bp);
|
|
|
|
DNS_FATAL(bp + n < &hostbuf[sizeof hostbuf]);
|
|
DNS_ASSERT(hap < &h_addr_ptrs[MAXADDRS-1]);
|
|
#ifdef FILTER_V4MAPPED
|
|
if (type == T_AAAA) {
|
|
struct in6_addr in6;
|
|
memcpy(&in6, cp, sizeof(in6));
|
|
DNS_ASSERT(IN6_IS_ADDR_V4MAPPED(&in6) == 0);
|
|
}
|
|
#endif
|
|
bcopy(cp, *hap++ = bp, n);
|
|
bp += n;
|
|
buflen -= n;
|
|
cp += n;
|
|
if (cp != erdata) {
|
|
*errp = NO_RECOVERY;
|
|
return (NULL);
|
|
}
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
if (!had_error)
|
|
haveanswer++;
|
|
}
|
|
if (haveanswer) {
|
|
*ap = NULL;
|
|
*hap = NULL;
|
|
if (!template->h_name) {
|
|
n = strlen(qname) + 1; /* for the \0 */
|
|
if (n > buflen || n >= MAXHOSTNAMELEN)
|
|
goto no_recovery;
|
|
strcpy(bp, qname);
|
|
template->h_name = bp;
|
|
bp += n;
|
|
buflen -= n;
|
|
}
|
|
*errp = NETDB_SUCCESS;
|
|
return (template);
|
|
}
|
|
no_recovery:
|
|
*errp = NO_RECOVERY;
|
|
return (NULL);
|
|
|
|
#undef BOUNDED_INCR
|
|
#undef BOUNDS_CHECK
|
|
#undef DNS_ASSERT
|
|
#undef DNS_FATAL
|
|
}
|
|
|
|
/* res_search() variant with multiple query support. */
|
|
static struct hostent *
|
|
_res_search_multi(name, rtl, errp)
|
|
const char *name; /* domain name */
|
|
struct __res_type_list *rtl; /* list of query types */
|
|
int *errp;
|
|
{
|
|
const char *cp, * const *domain;
|
|
struct hostent *hp0 = NULL, *hp;
|
|
struct hostent hpbuf;
|
|
u_int dots;
|
|
int trailing_dot, ret, saved_herrno;
|
|
int got_nodata = 0, got_servfail = 0, tried_as_is = 0;
|
|
struct __res_type_list *rtl0 = rtl;
|
|
querybuf buf;
|
|
|
|
if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
|
|
*errp = NETDB_INTERNAL;
|
|
return (NULL);
|
|
}
|
|
dots = 0;
|
|
for (cp = name; *cp; cp++)
|
|
dots += (*cp == '.');
|
|
trailing_dot = 0;
|
|
if (cp > name && *--cp == '.')
|
|
trailing_dot++;
|
|
|
|
/* If there aren't any dots, it could be a user-level alias */
|
|
if (!dots && (cp = hostalias(name)) != NULL) {
|
|
for(rtl = rtl0; rtl != NULL;
|
|
rtl = SLIST_NEXT(rtl, rtl_entry)) {
|
|
ret = res_query(cp, C_IN, rtl->rtl_type, buf.buf,
|
|
sizeof(buf.buf));
|
|
if (ret > 0) {
|
|
hpbuf.h_addrtype = (rtl->rtl_type == T_AAAA)
|
|
? AF_INET6 : AF_INET;
|
|
hpbuf.h_length = ADDRLEN(hpbuf.h_addrtype);
|
|
hp = getanswer(&buf, ret, name, rtl->rtl_type,
|
|
&hpbuf, errp);
|
|
if (!hp)
|
|
continue;
|
|
hp = _hpcopy(&hpbuf, errp);
|
|
hp0 = _hpmerge(hp0, hp, errp);
|
|
}
|
|
}
|
|
return (hp0);
|
|
}
|
|
|
|
/*
|
|
* If there are dots in the name already, let's just give it a try
|
|
* 'as is'. The threshold can be set with the "ndots" option.
|
|
*/
|
|
saved_herrno = -1;
|
|
if (dots >= _res.ndots) {
|
|
for(rtl = rtl0; rtl != NULL;
|
|
rtl = SLIST_NEXT(rtl, rtl_entry)) {
|
|
ret = res_querydomain(name, NULL, C_IN, rtl->rtl_type,
|
|
buf.buf, sizeof(buf.buf));
|
|
if (ret > 0) {
|
|
hpbuf.h_addrtype = (rtl->rtl_type == T_AAAA)
|
|
? AF_INET6 : AF_INET;
|
|
hpbuf.h_length = ADDRLEN(hpbuf.h_addrtype);
|
|
hp = getanswer(&buf, ret, name, rtl->rtl_type,
|
|
&hpbuf, errp);
|
|
if (!hp)
|
|
continue;
|
|
hp = _hpcopy(&hpbuf, errp);
|
|
hp0 = _hpmerge(hp0, hp, errp);
|
|
}
|
|
}
|
|
if (hp0 != NULL)
|
|
return (hp0);
|
|
saved_herrno = *errp;
|
|
tried_as_is++;
|
|
}
|
|
|
|
/*
|
|
* We do at least one level of search if
|
|
* - there is no dot and RES_DEFNAME is set, or
|
|
* - there is at least one dot, there is no trailing dot,
|
|
* and RES_DNSRCH is set.
|
|
*/
|
|
if ((!dots && (_res.options & RES_DEFNAMES)) ||
|
|
(dots && !trailing_dot && (_res.options & RES_DNSRCH))) {
|
|
int done = 0;
|
|
|
|
for (domain = (const char * const *)_res.dnsrch;
|
|
*domain && !done;
|
|
domain++) {
|
|
|
|
for(rtl = rtl0; rtl != NULL;
|
|
rtl = SLIST_NEXT(rtl, rtl_entry)) {
|
|
ret = res_querydomain(name, *domain, C_IN,
|
|
rtl->rtl_type,
|
|
buf.buf, sizeof(buf.buf));
|
|
if (ret > 0) {
|
|
hpbuf.h_addrtype = (rtl->rtl_type == T_AAAA)
|
|
? AF_INET6 : AF_INET;
|
|
hpbuf.h_length = ADDRLEN(hpbuf.h_addrtype);
|
|
hp = getanswer(&buf, ret, name,
|
|
rtl->rtl_type, &hpbuf, errp);
|
|
if (!hp)
|
|
continue;
|
|
hp = _hpcopy(&hpbuf, errp);
|
|
hp0 = _hpmerge(hp0, hp, errp);
|
|
}
|
|
}
|
|
if (hp0 != NULL)
|
|
return (hp0);
|
|
|
|
/*
|
|
* If no server present, give up.
|
|
* If name isn't found in this domain,
|
|
* keep trying higher domains in the search list
|
|
* (if that's enabled).
|
|
* On a NO_DATA error, keep trying, otherwise
|
|
* a wildcard entry of another type could keep us
|
|
* from finding this entry higher in the domain.
|
|
* If we get some other error (negative answer or
|
|
* server failure), then stop searching up,
|
|
* but try the input name below in case it's
|
|
* fully-qualified.
|
|
*/
|
|
if (errno == ECONNREFUSED) {
|
|
*errp = TRY_AGAIN;
|
|
return (NULL);
|
|
}
|
|
|
|
switch (*errp) {
|
|
case NO_DATA:
|
|
got_nodata++;
|
|
/* FALLTHROUGH */
|
|
case HOST_NOT_FOUND:
|
|
/* keep trying */
|
|
break;
|
|
case TRY_AGAIN:
|
|
if (buf.hdr.rcode == SERVFAIL) {
|
|
/* try next search element, if any */
|
|
got_servfail++;
|
|
break;
|
|
}
|
|
/* FALLTHROUGH */
|
|
default:
|
|
/* anything else implies that we're done */
|
|
done++;
|
|
}
|
|
|
|
/* if we got here for some reason other than DNSRCH,
|
|
* we only wanted one iteration of the loop, so stop.
|
|
*/
|
|
if (!(_res.options & RES_DNSRCH))
|
|
done++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If we have not already tried the name "as is", do that now.
|
|
* note that we do this regardless of how many dots were in the
|
|
* name or whether it ends with a dot unless NOTLDQUERY is set.
|
|
*/
|
|
if (!tried_as_is && (dots || !(_res.options & RES_NOTLDQUERY))) {
|
|
for(rtl = rtl0; rtl != NULL;
|
|
rtl = SLIST_NEXT(rtl, rtl_entry)) {
|
|
ret = res_querydomain(name, NULL, C_IN, rtl->rtl_type,
|
|
buf.buf, sizeof(buf.buf));
|
|
if (ret > 0) {
|
|
hpbuf.h_addrtype = (rtl->rtl_type == T_AAAA)
|
|
? AF_INET6 : AF_INET;
|
|
hpbuf.h_length = ADDRLEN(hpbuf.h_addrtype);
|
|
hp = getanswer(&buf, ret, name, rtl->rtl_type,
|
|
&hpbuf, errp);
|
|
if (!hp)
|
|
continue;
|
|
hp = _hpcopy(&hpbuf, errp);
|
|
hp0 = _hpmerge(hp0, hp, errp);
|
|
}
|
|
}
|
|
if (hp0 != NULL)
|
|
return (hp0);
|
|
}
|
|
|
|
/* if we got here, we didn't satisfy the search.
|
|
* if we did an initial full query, return that query's h_errno
|
|
* (note that we wouldn't be here if that query had succeeded).
|
|
* else if we ever got a nodata, send that back as the reason.
|
|
* else send back meaningless h_errno, that being the one from
|
|
* the last DNSRCH we did.
|
|
*/
|
|
if (saved_herrno != -1)
|
|
*errp = saved_herrno;
|
|
else if (got_nodata)
|
|
*errp = NO_DATA;
|
|
else if (got_servfail)
|
|
*errp = TRY_AGAIN;
|
|
return (NULL);
|
|
}
|
|
|
|
static struct hostent *
|
|
_dns_ghbyname(const char *name, int af, int *errp)
|
|
{
|
|
struct __res_type_list *rtl, rtl4;
|
|
#ifdef INET6
|
|
struct __res_type_list rtl6;
|
|
#endif
|
|
|
|
#ifdef INET6
|
|
switch (af) {
|
|
case AF_UNSPEC:
|
|
SLIST_NEXT(&rtl4, rtl_entry) = NULL; rtl4.rtl_type = T_A;
|
|
SLIST_NEXT(&rtl6, rtl_entry) = &rtl4; rtl6.rtl_type = T_AAAA;
|
|
rtl = &rtl6;
|
|
break;
|
|
case AF_INET6:
|
|
SLIST_NEXT(&rtl6, rtl_entry) = NULL; rtl6.rtl_type = T_AAAA;
|
|
rtl = &rtl6;
|
|
break;
|
|
case AF_INET:
|
|
SLIST_NEXT(&rtl4, rtl_entry) = NULL; rtl4.rtl_type = T_A;
|
|
rtl = &rtl4;
|
|
break;
|
|
}
|
|
#else
|
|
SLIST_NEXT(&rtl4, rtl_entry) = NULL; rtl4.rtl_type = T_A;
|
|
rtl = &rtl4;
|
|
#endif
|
|
return(_res_search_multi(name, rtl, errp));
|
|
}
|
|
|
|
static struct hostent *
|
|
_dns_ghbyaddr(const void *addr, int addrlen, int af, int *errp)
|
|
{
|
|
int n;
|
|
struct hostent *hp;
|
|
u_char c, *cp;
|
|
char *bp;
|
|
struct hostent hbuf;
|
|
int na;
|
|
#ifdef INET6
|
|
static const char hex[] = "0123456789abcdef";
|
|
#endif
|
|
querybuf buf;
|
|
char qbuf[MAXDNAME+1];
|
|
char *hlist[2];
|
|
|
|
#ifdef INET6
|
|
/* XXX */
|
|
if (af == AF_INET6 && IN6_IS_ADDR_LINKLOCAL((struct in6_addr *)addr))
|
|
return NULL;
|
|
#endif
|
|
|
|
if ((_res.options & RES_INIT) == 0) {
|
|
if (res_init() < 0) {
|
|
*errp = h_errno;
|
|
return NULL;
|
|
}
|
|
}
|
|
memset(&hbuf, 0, sizeof(hbuf));
|
|
hbuf.h_name = NULL;
|
|
hbuf.h_addrtype = af;
|
|
hbuf.h_length = addrlen;
|
|
na = 0;
|
|
|
|
/* XXX assumes that MAXDNAME is big enough */
|
|
n = 0;
|
|
bp = qbuf;
|
|
cp = (u_char *)addr+addrlen-1;
|
|
switch (af) {
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
for (; n < addrlen; n++, cp--) {
|
|
c = *cp;
|
|
*bp++ = hex[c & 0xf];
|
|
*bp++ = '.';
|
|
*bp++ = hex[c >> 4];
|
|
*bp++ = '.';
|
|
}
|
|
strcpy(bp, "ip6.int");
|
|
break;
|
|
#endif
|
|
default:
|
|
for (; n < addrlen; n++, cp--) {
|
|
c = *cp;
|
|
if (c >= 100)
|
|
*bp++ = '0' + c / 100;
|
|
if (c >= 10)
|
|
*bp++ = '0' + (c % 100) / 10;
|
|
*bp++ = '0' + c % 10;
|
|
*bp++ = '.';
|
|
}
|
|
strcpy(bp, "in-addr.arpa");
|
|
break;
|
|
}
|
|
|
|
n = res_query(qbuf, C_IN, T_PTR, buf.buf, sizeof buf.buf);
|
|
if (n < 0) {
|
|
*errp = h_errno;
|
|
return NULL;
|
|
}
|
|
hp = getanswer(&buf, n, qbuf, T_PTR, &hbuf, errp);
|
|
if (!hp)
|
|
return NULL;
|
|
hbuf.h_addrtype = af;
|
|
hbuf.h_length = addrlen;
|
|
hbuf.h_addr_list = hlist;
|
|
hlist[0] = (char *)addr;
|
|
hlist[1] = NULL;
|
|
return _hpcopy(&hbuf, errp);
|
|
}
|
|
|
|
static void
|
|
_dns_shent(int stayopen)
|
|
{
|
|
if ((_res.options & RES_INIT) == 0) {
|
|
if (res_init() < 0)
|
|
return;
|
|
}
|
|
if (stayopen)
|
|
_res.options |= RES_STAYOPEN | RES_USEVC;
|
|
}
|
|
|
|
static void
|
|
_dns_ehent(void)
|
|
{
|
|
_res.options &= ~(RES_STAYOPEN | RES_USEVC);
|
|
res_close();
|
|
}
|
|
|
|
#ifdef ICMPNL
|
|
|
|
/*
|
|
* experimental:
|
|
* draft-ietf-ipngwg-icmp-namelookups-02.txt
|
|
* ifindex is assumed to be encoded in addr.
|
|
*/
|
|
#include <sys/uio.h>
|
|
#include <netinet/ip6.h>
|
|
#include <netinet/icmp6.h>
|
|
|
|
struct _icmp_host_cache {
|
|
struct _icmp_host_cache *hc_next;
|
|
int hc_ifindex;
|
|
struct in6_addr hc_addr;
|
|
char *hc_name;
|
|
};
|
|
|
|
static char *
|
|
_icmp_fqdn_query(const struct in6_addr *addr, int ifindex)
|
|
{
|
|
int s;
|
|
struct icmp6_filter filter;
|
|
struct msghdr msg;
|
|
struct cmsghdr *cmsg;
|
|
struct in6_pktinfo *pkt;
|
|
char cbuf[256];
|
|
char buf[1024];
|
|
int cc;
|
|
struct icmp6_fqdn_query *fq;
|
|
struct icmp6_fqdn_reply *fr;
|
|
struct _icmp_host_cache *hc;
|
|
struct sockaddr_in6 sin6;
|
|
struct iovec iov;
|
|
fd_set s_fds, fds;
|
|
struct timeval tout;
|
|
int len;
|
|
char *name;
|
|
static int pid;
|
|
static struct _icmp_host_cache *hc_head;
|
|
|
|
for (hc = hc_head; hc; hc = hc->hc_next) {
|
|
if (hc->hc_ifindex == ifindex
|
|
&& IN6_ARE_ADDR_EQUAL(&hc->hc_addr, addr))
|
|
return hc->hc_name;
|
|
}
|
|
|
|
if (pid == 0)
|
|
pid = getpid();
|
|
|
|
ICMP6_FILTER_SETBLOCKALL(&filter);
|
|
ICMP6_FILTER_SETPASS(ICMP6_FQDN_REPLY, &filter);
|
|
|
|
FD_ZERO(&s_fds);
|
|
tout.tv_sec = 0;
|
|
tout.tv_usec = 200000; /*XXX: 200ms*/
|
|
|
|
fq = (struct icmp6_fqdn_query *)buf;
|
|
fq->icmp6_fqdn_type = ICMP6_FQDN_QUERY;
|
|
fq->icmp6_fqdn_code = 0;
|
|
fq->icmp6_fqdn_cksum = 0;
|
|
fq->icmp6_fqdn_id = (u_short)pid;
|
|
fq->icmp6_fqdn_unused = 0;
|
|
fq->icmp6_fqdn_cookie[0] = 0;
|
|
fq->icmp6_fqdn_cookie[1] = 0;
|
|
|
|
memset(&sin6, 0, sizeof(sin6));
|
|
sin6.sin6_family = AF_INET6;
|
|
sin6.sin6_addr = *addr;
|
|
|
|
memset(&msg, 0, sizeof(msg));
|
|
msg.msg_name = (caddr_t)&sin6;
|
|
msg.msg_namelen = sizeof(sin6);
|
|
msg.msg_iov = &iov;
|
|
msg.msg_iovlen = 1;
|
|
msg.msg_control = NULL;
|
|
msg.msg_controllen = 0;
|
|
iov.iov_base = (caddr_t)buf;
|
|
iov.iov_len = sizeof(struct icmp6_fqdn_query);
|
|
|
|
if (ifindex) {
|
|
msg.msg_control = cbuf;
|
|
msg.msg_controllen = sizeof(cbuf);
|
|
cmsg = CMSG_FIRSTHDR(&msg);
|
|
cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
|
|
cmsg->cmsg_level = IPPROTO_IPV6;
|
|
cmsg->cmsg_type = IPV6_PKTINFO;
|
|
pkt = (struct in6_pktinfo *)&cmsg[1];
|
|
memset(&pkt->ipi6_addr, 0, sizeof(struct in6_addr));
|
|
pkt->ipi6_ifindex = ifindex;
|
|
cmsg = CMSG_NXTHDR(&msg, cmsg);
|
|
msg.msg_controllen = (char *)cmsg - cbuf;
|
|
}
|
|
|
|
if ((s = socket(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0)
|
|
return NULL;
|
|
(void)setsockopt(s, IPPROTO_ICMPV6, ICMP6_FILTER,
|
|
(char *)&filter, sizeof(filter));
|
|
cc = sendmsg(s, &msg, 0);
|
|
if (cc < 0) {
|
|
_close(s);
|
|
return NULL;
|
|
}
|
|
FD_SET(s, &s_fds);
|
|
for (;;) {
|
|
fds = s_fds;
|
|
if (select(s + 1, &fds, NULL, NULL, &tout) <= 0) {
|
|
_close(s);
|
|
return NULL;
|
|
}
|
|
len = sizeof(sin6);
|
|
cc = recvfrom(s, buf, sizeof(buf), 0,
|
|
(struct sockaddr *)&sin6, &len);
|
|
if (cc <= 0) {
|
|
_close(s);
|
|
return NULL;
|
|
}
|
|
if (cc < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr))
|
|
continue;
|
|
if (!IN6_ARE_ADDR_EQUAL(addr, &sin6.sin6_addr))
|
|
continue;
|
|
fr = (struct icmp6_fqdn_reply *)(buf + sizeof(struct ip6_hdr));
|
|
if (fr->icmp6_fqdn_type == ICMP6_FQDN_REPLY)
|
|
break;
|
|
}
|
|
_close(s);
|
|
if (fr->icmp6_fqdn_cookie[1] != 0) {
|
|
/* rfc1788 type */
|
|
name = buf + sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 4;
|
|
len = (buf + cc) - name;
|
|
} else {
|
|
len = fr->icmp6_fqdn_namelen;
|
|
name = fr->icmp6_fqdn_name;
|
|
}
|
|
if (len <= 0)
|
|
return NULL;
|
|
name[len] = 0;
|
|
|
|
if ((hc = (struct _icmp_host_cache *)malloc(sizeof(*hc))) == NULL)
|
|
return NULL;
|
|
/* XXX: limit number of cached entries */
|
|
hc->hc_ifindex = ifindex;
|
|
hc->hc_addr = *addr;
|
|
hc->hc_name = strdup(name);
|
|
hc->hc_next = hc_head;
|
|
hc_head = hc;
|
|
return hc->hc_name;
|
|
}
|
|
|
|
static struct hostent *
|
|
_icmp_ghbyaddr(const void *addr, int addrlen, int af, int *errp)
|
|
{
|
|
char *hname;
|
|
int ifindex;
|
|
struct in6_addr addr6;
|
|
|
|
if (af != AF_INET6) {
|
|
/*
|
|
* Note: rfc1788 defines Who Are You for IPv4,
|
|
* but no one implements it.
|
|
*/
|
|
return NULL;
|
|
}
|
|
|
|
memcpy(&addr6, addr, addrlen);
|
|
ifindex = (addr6.s6_addr[2] << 8) | addr6.s6_addr[3];
|
|
addr6.s6_addr[2] = addr6.s6_addr[3] = 0;
|
|
|
|
if (!IN6_IS_ADDR_LINKLOCAL(&addr6))
|
|
return NULL; /*XXX*/
|
|
|
|
if ((hname = _icmp_fqdn_query(&addr6, ifindex)) == NULL)
|
|
return NULL;
|
|
return _hpaddr(af, hname, &addr6, errp);
|
|
}
|
|
#endif /* ICMPNL */
|