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d1fe1f2219
* nscd/aicache.c: Prefer using gethostbyname3_r NSS callback to also get ttl and canonical name. Use these two values. * resolv/Versions: Export _nss_dns_gethostbyname3_r from libnss_dns. * resolv/nss_dns/dns-host.c (getanswer_r): Take two new parameters. If nonnull fill with TTL and pointer to canonical name respectively. (_nss_dns_gethostbyaddr_r): Pass NULL in new parameters of getanswer_r. (_nss_dns_gethostbyname2_r): Just wrapper around _nss_dns_gethostbyname3_r. (_nss_dns_gethostbyname3_r): Renamed from _nss_dns_gethostbyname2_r. Take two new parameters which as passed to getanswer_r.
827 lines
22 KiB
C
827 lines
22 KiB
C
/* Copyright (C) 1996-2003, 2004 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Extended from original form by Ulrich Drepper <drepper@cygnus.com>, 1996.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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/* Parts of this file are plain copies of the file `gethtnamadr.c' from
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the bind package and it has the following copyright. */
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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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* 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 <ctype.h>
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#include <errno.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <string.h>
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#include <sys/syslog.h>
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#include "nsswitch.h"
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/* Get implementation for some internal functions. */
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#include <resolv/mapv4v6addr.h>
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#include <resolv/mapv4v6hostent.h>
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#define RESOLVSORT
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/* Maximum number of aliases we allow. */
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#define MAX_NR_ALIASES 48
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#define MAX_NR_ADDRS 48
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#if PACKETSZ > 65536
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# define MAXPACKET PACKETSZ
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#else
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# define MAXPACKET 65536
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#endif
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/* As per RFC 1034 and 1035 a host name cannot exceed 255 octets in length. */
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#ifdef MAXHOSTNAMELEN
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# undef MAXHOSTNAMELEN
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#endif
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#define MAXHOSTNAMELEN 256
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static const char AskedForGot[] = "\
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gethostby*.getanswer: asked for \"%s\", got \"%s\"";
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/* We need this time later. */
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typedef union querybuf
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{
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HEADER hdr;
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u_char buf[MAXPACKET];
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} querybuf;
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/* These functions are defined in res_comp.c. */
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#define NS_MAXCDNAME 255 /* maximum compressed domain name */
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extern int __ns_name_ntop (const u_char *, char *, size_t);
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extern int __ns_name_unpack (const u_char *, const u_char *,
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const u_char *, u_char *, size_t);
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static enum nss_status getanswer_r (const querybuf *answer, int anslen,
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const char *qname, int qtype,
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struct hostent *result, char *buffer,
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size_t buflen, int *errnop, int *h_errnop,
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int map, int32_t *ttlp, char **canonp);
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enum nss_status
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_nss_dns_gethostbyname3_r (const char *name, int af, struct hostent *result,
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char *buffer, size_t buflen, int *errnop,
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int *h_errnop, int32_t *ttlp, char **canonp)
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{
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union
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{
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querybuf *buf;
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u_char *ptr;
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} host_buffer;
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querybuf *orig_host_buffer;
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char tmp[NS_MAXDNAME];
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int size, type, n;
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const char *cp;
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int map = 0;
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int olderr = errno;
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enum nss_status status;
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if (__res_maybe_init (&_res, 0) == -1)
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return NSS_STATUS_UNAVAIL;
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switch (af) {
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case AF_INET:
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size = INADDRSZ;
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type = T_A;
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break;
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case AF_INET6:
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size = IN6ADDRSZ;
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type = T_AAAA;
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break;
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default:
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*h_errnop = NO_DATA;
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*errnop = EAFNOSUPPORT;
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return NSS_STATUS_UNAVAIL;
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}
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result->h_addrtype = af;
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result->h_length = size;
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/*
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* if there aren't any dots, it could be a user-level alias.
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* this is also done in res_query() since we are not the only
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* function that looks up host names.
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*/
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if (strchr (name, '.') == NULL
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&& (cp = res_hostalias (&_res, name, tmp, sizeof (tmp))) != NULL)
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name = cp;
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host_buffer.buf = orig_host_buffer = (querybuf *) alloca (1024);
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n = __libc_res_nsearch (&_res, name, C_IN, type, host_buffer.buf->buf,
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1024, &host_buffer.ptr);
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if (n < 0)
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{
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enum nss_status status = (errno == ECONNREFUSED
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? NSS_STATUS_UNAVAIL : NSS_STATUS_NOTFOUND);
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*h_errnop = h_errno;
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if (h_errno == TRY_AGAIN)
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*errnop = EAGAIN;
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else
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__set_errno (olderr);
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/* If we are looking for a IPv6 address and mapping is enabled
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by having the RES_USE_INET6 bit in _res.options set, we try
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another lookup. */
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if (af == AF_INET6 && (_res.options & RES_USE_INET6))
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n = __libc_res_nsearch (&_res, name, C_IN, T_A, host_buffer.buf->buf,
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host_buffer.buf != orig_host_buffer
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? MAXPACKET : 1024, &host_buffer.ptr);
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if (n < 0)
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{
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if (host_buffer.buf != orig_host_buffer)
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free (host_buffer.buf);
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return status;
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}
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map = 1;
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result->h_addrtype = AF_INET;
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result->h_length = INADDRSZ;;
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}
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status = getanswer_r (host_buffer.buf, n, name, type, result, buffer, buflen,
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errnop, h_errnop, map, ttlp, canonp);
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if (host_buffer.buf != orig_host_buffer)
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free (host_buffer.buf);
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return status;
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}
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enum nss_status
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_nss_dns_gethostbyname2_r (const char *name, int af, struct hostent *result,
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char *buffer, size_t buflen, int *errnop,
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int *h_errnop)
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{
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return _nss_dns_gethostbyname3_r (name, af, result, buffer, buflen, errnop,
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h_errnop, NULL, NULL);
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}
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enum nss_status
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_nss_dns_gethostbyname_r (const char *name, struct hostent *result,
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char *buffer, size_t buflen, int *errnop,
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int *h_errnop)
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{
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enum nss_status status = NSS_STATUS_NOTFOUND;
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if (_res.options & RES_USE_INET6)
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status = _nss_dns_gethostbyname2_r (name, AF_INET6, result, buffer,
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buflen, errnop, h_errnop);
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if (status == NSS_STATUS_NOTFOUND)
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status = _nss_dns_gethostbyname2_r (name, AF_INET, result, buffer,
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buflen, errnop, h_errnop);
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return status;
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}
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enum nss_status
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_nss_dns_gethostbyaddr_r (const void *addr, socklen_t len, int af,
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struct hostent *result, char *buffer, size_t buflen,
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int *errnop, int *h_errnop)
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{
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static const u_char mapped[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0xff,0xff };
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static const u_char tunnelled[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0,0 };
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static const u_char v6local[] = { 0,0, 0,1 };
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const u_char *uaddr = (const u_char *)addr;
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struct host_data
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{
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char *aliases[MAX_NR_ALIASES];
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unsigned char host_addr[16]; /* IPv4 or IPv6 */
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char *h_addr_ptrs[MAX_NR_ADDRS + 1];
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char linebuffer[0];
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} *host_data = (struct host_data *) buffer;
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union
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{
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querybuf *buf;
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u_char *ptr;
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} host_buffer;
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querybuf *orig_host_buffer;
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char qbuf[MAXDNAME+1], *qp = NULL;
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size_t size;
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int n, status;
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int olderr = errno;
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if (__res_maybe_init (&_res, 0) == -1)
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return NSS_STATUS_UNAVAIL;
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if (af == AF_INET6 && len == IN6ADDRSZ
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&& (memcmp (uaddr, mapped, sizeof mapped) == 0
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|| (memcmp (uaddr, tunnelled, sizeof tunnelled) == 0
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&& memcmp (&uaddr[sizeof tunnelled], v6local, sizeof v6local))))
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{
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/* Unmap. */
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addr += sizeof mapped;
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uaddr += sizeof mapped;
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af = AF_INET;
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len = INADDRSZ;
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}
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switch (af)
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{
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case AF_INET:
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size = INADDRSZ;
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break;
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case AF_INET6:
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size = IN6ADDRSZ;
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break;
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default:
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*errnop = EAFNOSUPPORT;
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*h_errnop = NETDB_INTERNAL;
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return NSS_STATUS_UNAVAIL;
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}
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if (size > len)
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{
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*errnop = EAFNOSUPPORT;
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*h_errnop = NETDB_INTERNAL;
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return NSS_STATUS_UNAVAIL;
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}
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host_buffer.buf = orig_host_buffer = (querybuf *) alloca (1024);
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switch (af)
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{
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case AF_INET:
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sprintf (qbuf, "%u.%u.%u.%u.in-addr.arpa", (uaddr[3] & 0xff),
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(uaddr[2] & 0xff), (uaddr[1] & 0xff), (uaddr[0] & 0xff));
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break;
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case AF_INET6:
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/* Only lookup with the byte string format if the user wants it. */
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if (__builtin_expect (_res.options & RES_USEBSTRING, 0))
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{
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qp = stpcpy (qbuf, "\\[x");
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for (n = 0; n < IN6ADDRSZ; ++n)
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qp += sprintf (qp, "%02hhx", uaddr[n]);
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strcpy (qp, "].ip6.arpa");
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n = __libc_res_nquery (&_res, qbuf, C_IN, T_PTR,
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host_buffer.buf->buf, 1024, &host_buffer.ptr);
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if (n >= 0)
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goto got_it_already;
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}
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qp = qbuf;
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for (n = IN6ADDRSZ - 1; n >= 0; n--)
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{
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static const char nibblechar[16] = "0123456789abcdef";
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*qp++ = nibblechar[uaddr[n] & 0xf];
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*qp++ = '.';
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*qp++ = nibblechar[(uaddr[n] >> 4) & 0xf];
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*qp++ = '.';
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}
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strcpy(qp, "ip6.arpa");
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break;
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default:
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/* Cannot happen. */
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break;
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}
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n = __libc_res_nquery (&_res, qbuf, C_IN, T_PTR, host_buffer.buf->buf,
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1024, &host_buffer.ptr);
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if (n < 0 && af == AF_INET6 && (_res.options & RES_NOIP6DOTINT) == 0)
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{
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strcpy (qp, "ip6.int");
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n = __libc_res_nquery (&_res, qbuf, C_IN, T_PTR, host_buffer.buf->buf,
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host_buffer.buf != orig_host_buffer
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? MAXPACKET : 1024, &host_buffer.ptr);
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}
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if (n < 0)
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{
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*h_errnop = h_errno;
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__set_errno (olderr);
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if (host_buffer.buf != orig_host_buffer)
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free (host_buffer.buf);
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return errno == ECONNREFUSED ? NSS_STATUS_UNAVAIL : NSS_STATUS_NOTFOUND;
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}
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got_it_already:
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status = getanswer_r (host_buffer.buf, n, qbuf, T_PTR, result, buffer, buflen,
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errnop, h_errnop, 0 /* XXX */, NULL, NULL);
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if (host_buffer.buf != orig_host_buffer)
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free (host_buffer.buf);
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if (status != NSS_STATUS_SUCCESS)
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{
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*h_errnop = h_errno;
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*errnop = errno;
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return status;
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}
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#ifdef SUNSECURITY
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This is not implemented because it is not possible to use the current
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source from bind in a multi-threaded program.
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#endif
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result->h_addrtype = af;
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result->h_length = len;
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memcpy (host_data->host_addr, addr, len);
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host_data->h_addr_ptrs[0] = (char *) host_data->host_addr;
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host_data->h_addr_ptrs[1] = NULL;
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#if 0
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/* XXX I think this is wrong. Why should an IPv4 address be
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converted to IPv6 if the user explicitly asked for IPv4? */
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if (af == AF_INET && (_res.options & RES_USE_INET6))
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{
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map_v4v6_address ((char *) host_data->host_addr,
|
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(char *) host_data->host_addr);
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result->h_addrtype = AF_INET6;
|
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result->h_length = IN6ADDRSZ;
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}
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#endif
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*h_errnop = NETDB_SUCCESS;
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return NSS_STATUS_SUCCESS;
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}
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|
|
#ifdef RESOLVSORT
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static void addrsort (char **ap, int num);
|
|
|
|
static void
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addrsort (char **ap, int num)
|
|
{
|
|
int i, j;
|
|
char **p;
|
|
short aval[MAX_NR_ADDRS];
|
|
int needsort = 0;
|
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|
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p = ap;
|
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if (num > MAX_NR_ADDRS)
|
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num = MAX_NR_ADDRS;
|
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for (i = 0; i < num; i++, p++)
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|
{
|
|
for (j = 0 ; (unsigned)j < _res.nsort; j++)
|
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if (_res.sort_list[j].addr.s_addr ==
|
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(((struct in_addr *)(*p))->s_addr & _res.sort_list[j].mask))
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break;
|
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aval[i] = j;
|
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if (needsort == 0 && i > 0 && j < aval[i-1])
|
|
needsort = i;
|
|
}
|
|
if (!needsort)
|
|
return;
|
|
|
|
while (needsort++ < num)
|
|
for (j = needsort - 2; j >= 0; j--)
|
|
if (aval[j] > aval[j+1])
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|
{
|
|
char *hp;
|
|
|
|
i = aval[j];
|
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aval[j] = aval[j+1];
|
|
aval[j+1] = i;
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|
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hp = ap[j];
|
|
ap[j] = ap[j+1];
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ap[j+1] = hp;
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}
|
|
else
|
|
break;
|
|
}
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|
#endif
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|
|
static enum nss_status
|
|
getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype,
|
|
struct hostent *result, char *buffer, size_t buflen,
|
|
int *errnop, int *h_errnop, int map, int32_t *ttlp, char **canonp)
|
|
{
|
|
struct host_data
|
|
{
|
|
char *aliases[MAX_NR_ALIASES];
|
|
unsigned char host_addr[16]; /* IPv4 or IPv6 */
|
|
char *h_addr_ptrs[0];
|
|
} *host_data = (struct host_data *) buffer;
|
|
int linebuflen = buflen - sizeof (struct host_data);
|
|
register const HEADER *hp;
|
|
const u_char *end_of_message, *cp;
|
|
int n, ancount, qdcount;
|
|
int haveanswer, had_error;
|
|
char *bp, **ap, **hap;
|
|
char tbuf[MAXDNAME];
|
|
const char *tname;
|
|
int (*name_ok) (const char *);
|
|
u_char packtmp[NS_MAXCDNAME];
|
|
int have_to_map = 0;
|
|
int32_t ttl = 0;
|
|
|
|
if (__builtin_expect (linebuflen, 0) < 0)
|
|
{
|
|
/* The buffer is too small. */
|
|
too_small:
|
|
*errnop = ERANGE;
|
|
*h_errnop = NETDB_INTERNAL;
|
|
return NSS_STATUS_TRYAGAIN;
|
|
}
|
|
|
|
tname = qname;
|
|
result->h_name = NULL;
|
|
end_of_message = 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:
|
|
*errnop = ENOENT;
|
|
return NSS_STATUS_UNAVAIL; /* XXX should be abort(); */
|
|
}
|
|
|
|
/*
|
|
* find first satisfactory answer
|
|
*/
|
|
hp = &answer->hdr;
|
|
ancount = ntohs (hp->ancount);
|
|
qdcount = ntohs (hp->qdcount);
|
|
cp = answer->buf + HFIXEDSZ;
|
|
if (__builtin_expect (qdcount, 1) != 1)
|
|
{
|
|
*h_errnop = NO_RECOVERY;
|
|
return NSS_STATUS_UNAVAIL;
|
|
}
|
|
if (sizeof (struct host_data) + (ancount + 1) * sizeof (char *) >= buflen)
|
|
goto too_small;
|
|
bp = (char *) &host_data->h_addr_ptrs[ancount + 1];
|
|
linebuflen -= (ancount + 1) * sizeof (char *);
|
|
|
|
n = __ns_name_unpack (answer->buf, end_of_message, cp,
|
|
packtmp, sizeof packtmp);
|
|
if (n != -1 && __ns_name_ntop (packtmp, bp, linebuflen) == -1)
|
|
{
|
|
if (__builtin_expect (errno, 0) == EMSGSIZE)
|
|
goto too_small;
|
|
|
|
n = -1;
|
|
}
|
|
|
|
if (n > 0 && bp[0] == '.')
|
|
bp[0] = '\0';
|
|
|
|
if (n < 0 || (*name_ok) (bp) == 0)
|
|
{
|
|
*errnop = errno;
|
|
*h_errnop = NO_RECOVERY;
|
|
return NSS_STATUS_UNAVAIL;
|
|
}
|
|
cp += 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)
|
|
{
|
|
*h_errnop = NO_RECOVERY;
|
|
*errnop = ENOENT;
|
|
return NSS_STATUS_TRYAGAIN;
|
|
}
|
|
result->h_name = bp;
|
|
bp += n;
|
|
linebuflen -= n;
|
|
if (linebuflen < 0)
|
|
goto too_small;
|
|
/* The qname can be abbreviated, but h_name is now absolute. */
|
|
qname = result->h_name;
|
|
}
|
|
|
|
ap = host_data->aliases;
|
|
*ap = NULL;
|
|
result->h_aliases = host_data->aliases;
|
|
hap = host_data->h_addr_ptrs;
|
|
*hap = NULL;
|
|
result->h_addr_list = host_data->h_addr_ptrs;
|
|
haveanswer = 0;
|
|
had_error = 0;
|
|
|
|
while (ancount-- > 0 && cp < end_of_message && had_error == 0)
|
|
{
|
|
int type, class;
|
|
|
|
n = __ns_name_unpack (answer->buf, end_of_message, cp,
|
|
packtmp, sizeof packtmp);
|
|
if (n != -1 && __ns_name_ntop (packtmp, bp, linebuflen) == -1)
|
|
{
|
|
if (__builtin_expect (errno, 0) == EMSGSIZE)
|
|
goto too_small;
|
|
|
|
n = -1;
|
|
}
|
|
|
|
if (n < 0 || (*name_ok) (bp) == 0)
|
|
{
|
|
++had_error;
|
|
continue;
|
|
}
|
|
cp += n; /* name */
|
|
type = ns_get16 (cp);
|
|
cp += INT16SZ; /* type */
|
|
class = ns_get16 (cp);
|
|
cp += INT16SZ; /* class */
|
|
ttl = ns_get32 (cp);
|
|
cp += INT32SZ; /* TTL */
|
|
n = ns_get16 (cp);
|
|
cp += INT16SZ; /* len */
|
|
if (class != C_IN)
|
|
{
|
|
/* XXX - debug? syslog? */
|
|
cp += n;
|
|
continue; /* XXX - had_error++ ? */
|
|
}
|
|
|
|
if ((qtype ==T_A || qtype == T_AAAA) && type == T_CNAME)
|
|
{
|
|
if (ap >= &host_data->aliases[MAX_NR_ALIASES - 1])
|
|
continue;
|
|
n = dn_expand (answer->buf, end_of_message, cp, tbuf, sizeof tbuf);
|
|
if (n < 0 || (*name_ok) (tbuf) == 0)
|
|
{
|
|
++had_error;
|
|
continue;
|
|
}
|
|
cp += n;
|
|
/* Store alias. */
|
|
*ap++ = bp;
|
|
n = strlen (bp) + 1; /* For the \0. */
|
|
if (__builtin_expect (n, 0) >= MAXHOSTNAMELEN)
|
|
{
|
|
++had_error;
|
|
continue;
|
|
}
|
|
bp += n;
|
|
linebuflen -= n;
|
|
/* Get canonical name. */
|
|
n = strlen (tbuf) + 1; /* For the \0. */
|
|
if (__builtin_expect (n > linebuflen, 0))
|
|
goto too_small;
|
|
if (__builtin_expect (n, 0) >= MAXHOSTNAMELEN)
|
|
{
|
|
++had_error;
|
|
continue;
|
|
}
|
|
result->h_name = bp;
|
|
bp = __mempcpy (bp, tbuf, n); /* Cannot overflow. */
|
|
linebuflen -= n;
|
|
continue;
|
|
}
|
|
|
|
if (qtype == T_PTR && type == T_CNAME)
|
|
{
|
|
n = dn_expand (answer->buf, end_of_message, cp, tbuf, sizeof tbuf);
|
|
if (n < 0 || res_dnok (tbuf) == 0)
|
|
{
|
|
++had_error;
|
|
continue;
|
|
}
|
|
cp += n;
|
|
/* Get canonical name. */
|
|
n = strlen (tbuf) + 1; /* For the \0. */
|
|
if (__builtin_expect (n > linebuflen, 0))
|
|
goto too_small;
|
|
if (__builtin_expect (n, 0) >= MAXHOSTNAMELEN)
|
|
{
|
|
++had_error;
|
|
continue;
|
|
}
|
|
tname = bp;
|
|
bp = __mempcpy (bp, tbuf, n); /* Cannot overflow. */
|
|
linebuflen -= n;
|
|
continue;
|
|
}
|
|
if (__builtin_expect (type == T_SIG, 0)
|
|
|| __builtin_expect (type == T_KEY, 0)
|
|
|| __builtin_expect (type == T_NXT, 0))
|
|
{
|
|
/* We don't support DNSSEC yet. For now, ignore the record
|
|
and send a low priority message to syslog. */
|
|
syslog (LOG_DEBUG | LOG_AUTH,
|
|
"gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"",
|
|
qname, p_class (C_IN), p_type(qtype), p_type (type));
|
|
cp += n;
|
|
continue;
|
|
}
|
|
|
|
if (type == T_A && qtype == T_AAAA && map)
|
|
have_to_map = 1;
|
|
else if (__builtin_expect (type != qtype, 0))
|
|
{
|
|
syslog (LOG_NOTICE | LOG_AUTH,
|
|
"gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"",
|
|
qname, p_class (C_IN), p_type (qtype), p_type (type));
|
|
cp += n;
|
|
continue; /* XXX - had_error++ ? */
|
|
}
|
|
|
|
switch (type)
|
|
{
|
|
case T_PTR:
|
|
if (__strcasecmp (tname, bp) != 0)
|
|
{
|
|
syslog (LOG_NOTICE | LOG_AUTH, AskedForGot, qname, bp);
|
|
cp += n;
|
|
continue; /* XXX - had_error++ ? */
|
|
}
|
|
|
|
n = __ns_name_unpack (answer->buf, end_of_message, cp,
|
|
packtmp, sizeof packtmp);
|
|
if (n != -1 && __ns_name_ntop (packtmp, bp, linebuflen) == -1)
|
|
{
|
|
if (__builtin_expect (errno, 0) == EMSGSIZE)
|
|
goto too_small;
|
|
|
|
n = -1;
|
|
}
|
|
|
|
if (n < 0 || res_hnok (bp) == 0)
|
|
{
|
|
++had_error;
|
|
break;
|
|
}
|
|
#if MULTI_PTRS_ARE_ALIASES
|
|
cp += n;
|
|
if (haveanswer == 0)
|
|
result->h_name = bp;
|
|
else if (ap < &host_data->aliases[MAXALIASES-1])
|
|
*ap++ = bp;
|
|
else
|
|
n = -1;
|
|
if (n != -1)
|
|
{
|
|
n = strlen (bp) + 1; /* for the \0 */
|
|
if (__builtin_expect (n, 0) >= MAXHOSTNAMELEN)
|
|
{
|
|
++had_error;
|
|
break;
|
|
}
|
|
bp += n;
|
|
linebuflen -= n;
|
|
}
|
|
break;
|
|
#else
|
|
result->h_name = bp;
|
|
if (have_to_map)
|
|
{
|
|
n = strlen (bp) + 1; /* for the \0 */
|
|
if (n >= MAXHOSTNAMELEN)
|
|
{
|
|
++had_error;
|
|
break;
|
|
}
|
|
bp += n;
|
|
linebuflen -= n;
|
|
map_v4v6_hostent (result, &bp, &linebuflen);
|
|
}
|
|
*h_errnop = NETDB_SUCCESS;
|
|
return NSS_STATUS_SUCCESS;
|
|
#endif
|
|
case T_A:
|
|
case T_AAAA:
|
|
if (__builtin_expect (strcasecmp (result->h_name, bp), 0) != 0)
|
|
{
|
|
syslog (LOG_NOTICE | LOG_AUTH, AskedForGot, result->h_name, bp);
|
|
cp += n;
|
|
continue; /* XXX - had_error++ ? */
|
|
}
|
|
if (n != result->h_length)
|
|
{
|
|
cp += n;
|
|
continue;
|
|
}
|
|
if (!haveanswer)
|
|
{
|
|
register int nn;
|
|
|
|
if (ttlp != NULL && ttl != 0)
|
|
*ttlp = ttl;
|
|
if (canonp != NULL)
|
|
*canonp = bp;
|
|
result->h_name = bp;
|
|
nn = strlen (bp) + 1; /* for the \0 */
|
|
bp += nn;
|
|
linebuflen -= nn;
|
|
}
|
|
|
|
linebuflen -= sizeof (align) - ((u_long) bp % sizeof (align));
|
|
bp += sizeof (align) - ((u_long) bp % sizeof (align));
|
|
|
|
if (__builtin_expect (n > linebuflen, 0))
|
|
goto too_small;
|
|
bp = __mempcpy (*hap++ = bp, cp, n);
|
|
cp += n;
|
|
linebuflen -= n;
|
|
break;
|
|
default:
|
|
abort ();
|
|
}
|
|
if (had_error == 0)
|
|
++haveanswer;
|
|
}
|
|
|
|
if (haveanswer > 0)
|
|
{
|
|
*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 (host_data->h_addr_ptrs, haveanswer);
|
|
#endif /*RESOLVSORT*/
|
|
|
|
if (result->h_name == NULL)
|
|
{
|
|
n = strlen (qname) + 1; /* For the \0. */
|
|
if (n > linebuflen)
|
|
goto too_small;
|
|
if (n >= MAXHOSTNAMELEN)
|
|
goto no_recovery;
|
|
result->h_name = bp;
|
|
bp = __mempcpy (bp, qname, n); /* Cannot overflow. */
|
|
linebuflen -= n;
|
|
}
|
|
|
|
if (have_to_map)
|
|
map_v4v6_hostent (result, &bp, &linebuflen);
|
|
*h_errnop = NETDB_SUCCESS;
|
|
return NSS_STATUS_SUCCESS;
|
|
}
|
|
no_recovery:
|
|
*h_errnop = NO_RECOVERY;
|
|
*errnop = ENOENT;
|
|
return NSS_STATUS_TRYAGAIN;
|
|
}
|