Add Socket Libraries.
Add Posix functions for porting compatibility. Fix compliance issues with ISO/IEC 9899:199409 New Functions: setenv(), fparseln(), GetFileNameFromPath(), rename(), realpath(), setprogname(), getprogname(), strlcat(), strlcpy(), strsep(), setitimer(), getitimer(), timegm(), getopt(), basename(), mkstemp(), ffs(), vsnprintf(), snprintf(), getpass(), usleep(), select(), writev(), strcasecmp(), getcwd(), chdir(), tcgetpgrp(), getpgrp(), gettimeofday(), bcopy(), git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12061 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
darylm503
814
StdLib/BsdSocketLib/gethostbydns.c
Normal file
814
StdLib/BsdSocketLib/gethostbydns.c
Normal file
@@ -0,0 +1,814 @@
|
||||
/*
|
||||
* ++Copyright++ 1985, 1988, 1993
|
||||
* -
|
||||
* Copyright (c) 1985, 1988, 1993
|
||||
* The Regents of the University of California. All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
* 3. All advertising materials mentioning features or use of this software
|
||||
* must display the following acknowledgement:
|
||||
* This product includes software developed by the University of
|
||||
* California, Berkeley and its contributors.
|
||||
* 4. Neither the name of the University nor the names of its contributors
|
||||
* may be used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
* -
|
||||
* Portions Copyright (c) 1993 by Digital Equipment Corporation.
|
||||
*
|
||||
* Permission to use, copy, modify, and distribute this software for any
|
||||
* purpose with or without fee is hereby granted, provided that the above
|
||||
* copyright notice and this permission notice appear in all copies, and that
|
||||
* the name of Digital Equipment Corporation not be used in advertising or
|
||||
* publicity pertaining to distribution of the document or software without
|
||||
* specific, written prior permission.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
|
||||
* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
|
||||
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
|
||||
* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
|
||||
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
|
||||
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
|
||||
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
|
||||
* SOFTWARE.
|
||||
* -
|
||||
* --Copyright--
|
||||
*/
|
||||
|
||||
/*
|
||||
* Portions copyright (c) 1999, 2000
|
||||
* Intel Corporation.
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
*
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
*
|
||||
* 3. All advertising materials mentioning features or use of this software
|
||||
* must display the following acknowledgement:
|
||||
*
|
||||
* This product includes software developed by Intel Corporation and
|
||||
* its contributors.
|
||||
*
|
||||
* 4. Neither the name of Intel Corporation or its contributors may be
|
||||
* used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY INTEL CORPORATION AND CONTRIBUTORS ``AS IS''
|
||||
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL INTEL CORPORATION OR CONTRIBUTORS BE
|
||||
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
||||
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
||||
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||||
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||||
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
|
||||
* THE POSSIBILITY OF SUCH DAMAGE.
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||||
*
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||||
*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93";
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static char fromrcsid[] = "From: Id: gethnamaddr.c,v 8.23 1998/04/07 04:59:46 vixie Exp $";
|
||||
static char rcsid[] = "$Id: gethostbydns.c,v 1.1.1.1 2003/11/19 01:51:27 kyu3 Exp $";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <arpa/nameser.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <netdb.h>
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#include <resolv.h>
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#include <ctype.h>
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#include <errno.h>
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#ifdef _ORG_FREEBSD_
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#include <syslog.h>
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#else
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#include <stdlib.h>
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u_int32_t _getlong(const u_char *src);
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u_int16_t _getshort(const u_char *src);
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#endif
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#include "res_config.h"
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#include "Socklib_internals.h"
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#define SPRINTF(x) ((size_t)sprintf x)
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#define MAXALIASES 35
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#define MAXADDRS 35
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static const char AskedForGot[] =
|
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"gethostby*.gethostanswer: asked for \"%s\", got \"%s\"";
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static char *h_addr_ptrs[MAXADDRS + 1];
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static struct hostent host;
|
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static char *host_aliases[MAXALIASES];
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||||
static char hostbuf[8*1024];
|
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static u_char host_addr[16]; /* IPv4 or IPv6 */
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||||
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||||
#ifdef RESOLVSORT
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||||
static void addrsort(char **, int);
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#endif
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||||
#if PACKETSZ > 1024
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#define MAXPACKET PACKETSZ
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#else
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#define MAXPACKET 1024
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#endif
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||||
typedef union {
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||||
HEADER hdr;
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||||
u_char buf[MAXPACKET];
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||||
} querybuf;
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||||
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||||
typedef union {
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||||
int32_t al;
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||||
char ac;
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} align;
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||||
extern int h_errno;
|
||||
int _dns_ttl_;
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||||
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||||
#ifdef DEBUG_RES
|
||||
static void
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||||
dprintf(char *msg, int num)
|
||||
{
|
||||
if (_res.options & RES_DEBUG) {
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||||
int save = errno;
|
||||
|
||||
printf(msg, num);
|
||||
errno = save;
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||||
}
|
||||
}
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||||
#else
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||||
# define dprintf(msg, num) /*nada*/
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||||
#endif
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||||
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#define BOUNDED_INCR(x) \
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||||
do { \
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||||
cp += x; \
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||||
if (cp > eom) { \
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||||
h_errno = NO_RECOVERY; \
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||||
return (NULL); \
|
||||
} \
|
||||
} while (0)
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||||
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||||
#define BOUNDS_CHECK(ptr, count) \
|
||||
do { \
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||||
if ((ptr) + (count) > eom) { \
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||||
h_errno = NO_RECOVERY; \
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return (NULL); \
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||||
} \
|
||||
} while (0)
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|
||||
static struct hostent *
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gethostanswer(const querybuf *answer, int anslen, const char *qname, int qtype)
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{
|
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register const HEADER *hp;
|
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register const u_char *cp;
|
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register int n;
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const u_char *eom, *erdata;
|
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char *bp, **ap, **hap;
|
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int type, class, buflen, ancount, qdcount;
|
||||
int haveanswer, had_error;
|
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int toobig = 0;
|
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char tbuf[MAXDNAME];
|
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const char *tname;
|
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int (*name_ok)(const char *);
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||||
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tname = qname;
|
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host.h_name = NULL;
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eom = answer->buf + anslen;
|
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switch (qtype) {
|
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case T_A:
|
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case T_AAAA:
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name_ok = res_hnok;
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break;
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case T_PTR:
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name_ok = res_dnok;
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break;
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default:
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h_errno = NO_RECOVERY;
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return (NULL); /* XXX should be abort(); */
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}
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/*
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* find first satisfactory answer
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*/
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hp = &answer->hdr;
|
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ancount = ntohs(hp->ancount);
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qdcount = ntohs(hp->qdcount);
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bp = hostbuf;
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buflen = sizeof hostbuf;
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cp = answer->buf;
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BOUNDED_INCR(HFIXEDSZ);
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if (qdcount != 1) {
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h_errno = NO_RECOVERY;
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return (NULL);
|
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}
|
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n = dn_expand(answer->buf, eom, cp, bp, buflen);
|
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if ((n < 0) || !(*name_ok)(bp)) {
|
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h_errno = NO_RECOVERY;
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return (NULL);
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}
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BOUNDED_INCR(n + QFIXEDSZ);
|
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if (qtype == T_A || qtype == T_AAAA) {
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/* res_send() has already verified that the query name is the
|
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* same as the one we sent; this just gets the expanded name
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* (i.e., with the succeeding search-domain tacked on).
|
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*/
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n = (int)strlen(bp) + 1; /* for the \0 */
|
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if (n >= MAXHOSTNAMELEN) {
|
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h_errno = NO_RECOVERY;
|
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return (NULL);
|
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}
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host.h_name = bp;
|
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bp += n;
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buflen -= n;
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/* The qname can be abbreviated, but h_name is now absolute. */
|
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qname = host.h_name;
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}
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ap = host_aliases;
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*ap = NULL;
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host.h_aliases = host_aliases;
|
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hap = h_addr_ptrs;
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*hap = NULL;
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host.h_addr_list = h_addr_ptrs;
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haveanswer = 0;
|
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had_error = 0;
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_dns_ttl_ = -1;
|
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while (ancount-- > 0 && cp < eom && !had_error) {
|
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n = dn_expand(answer->buf, eom, cp, bp, buflen);
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if ((n < 0) || !(*name_ok)(bp)) {
|
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had_error++;
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continue;
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}
|
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cp += n; /* name */
|
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BOUNDS_CHECK(cp, 3 * INT16SZ + INT32SZ);
|
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type = _getshort(cp);
|
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cp += INT16SZ; /* type */
|
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class = _getshort(cp);
|
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cp += INT16SZ; /* class */
|
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if (qtype == T_A && type == T_A)
|
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_dns_ttl_ = _getlong(cp);
|
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cp += INT32SZ; /* TTL */
|
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n = _getshort(cp);
|
||||
cp += INT16SZ; /* len */
|
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BOUNDS_CHECK(cp, n);
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erdata = cp + n;
|
||||
if (class != C_IN) {
|
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/* XXX - debug? syslog? */
|
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cp += n;
|
||||
continue; /* XXX - had_error++ ? */
|
||||
}
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||||
if ((qtype == T_A || qtype == T_AAAA) && type == T_CNAME) {
|
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if (ap >= &host_aliases[MAXALIASES-1])
|
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continue;
|
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n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
|
||||
if ((n < 0) || !(*name_ok)(tbuf)) {
|
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had_error++;
|
||||
continue;
|
||||
}
|
||||
cp += n;
|
||||
if (cp != erdata) {
|
||||
h_errno = NO_RECOVERY;
|
||||
return (NULL);
|
||||
}
|
||||
/* Store alias. */
|
||||
*ap++ = bp;
|
||||
n = (int)strlen(bp) + 1; /* for the \0 */
|
||||
if (n >= MAXHOSTNAMELEN) {
|
||||
had_error++;
|
||||
continue;
|
||||
}
|
||||
bp += n;
|
||||
buflen -= n;
|
||||
/* Get canonical name. */
|
||||
n = (int)strlen(tbuf) + 1; /* for the \0 */
|
||||
if (n > buflen || n >= MAXHOSTNAMELEN) {
|
||||
had_error++;
|
||||
continue;
|
||||
}
|
||||
strcpy(bp, tbuf);
|
||||
host.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) {
|
||||
h_errno = NO_RECOVERY;
|
||||
return (NULL);
|
||||
}
|
||||
/* Get canonical name. */
|
||||
n = (int)strlen(tbuf) + 1; /* for the \0 */
|
||||
if (n > buflen || n >= MAXHOSTNAMELEN) {
|
||||
had_error++;
|
||||
continue;
|
||||
}
|
||||
strcpy(bp, tbuf);
|
||||
tname = bp;
|
||||
bp += n;
|
||||
buflen -= n;
|
||||
continue;
|
||||
}
|
||||
if (type != qtype) {
|
||||
#ifdef _ORG_FREEBSD_
|
||||
syslog(LOG_NOTICE|LOG_AUTH,
|
||||
"gethostby*.gethostanswer: asked for \"%s %s %s\", got type \"%s\"",
|
||||
qname, p_class(C_IN), p_type(qtype),
|
||||
p_type(type));
|
||||
#endif
|
||||
cp += n;
|
||||
continue; /* XXX - had_error++ ? */
|
||||
}
|
||||
switch (type) {
|
||||
case T_PTR:
|
||||
if (strcasecmp(tname, bp) != 0) {
|
||||
#ifdef _ORG_FREEBSD_
|
||||
syslog(LOG_NOTICE|LOG_AUTH,
|
||||
AskedForGot, qname, bp);
|
||||
#endif
|
||||
cp += n;
|
||||
continue; /* XXX - had_error++ ? */
|
||||
}
|
||||
n = dn_expand(answer->buf, eom, cp, bp, buflen);
|
||||
if ((n < 0) || !res_hnok(bp)) {
|
||||
had_error++;
|
||||
break;
|
||||
}
|
||||
#if MULTI_PTRS_ARE_ALIASES
|
||||
cp += n;
|
||||
if (cp != erdata) {
|
||||
h_errno = NO_RECOVERY;
|
||||
return (NULL);
|
||||
}
|
||||
if (!haveanswer)
|
||||
host.h_name = bp;
|
||||
else if (ap < &host_aliases[MAXALIASES-1])
|
||||
*ap++ = bp;
|
||||
else
|
||||
n = -1;
|
||||
if (n != -1) {
|
||||
n = (int)strlen(bp) + 1; /* for the \0 */
|
||||
if (n >= MAXHOSTNAMELEN) {
|
||||
had_error++;
|
||||
break;
|
||||
}
|
||||
bp += n;
|
||||
buflen -= n;
|
||||
}
|
||||
break;
|
||||
#else
|
||||
host.h_name = bp;
|
||||
if (_res.options & RES_USE_INET6) {
|
||||
n = strlen(bp) + 1; /* for the \0 */
|
||||
if (n >= MAXHOSTNAMELEN) {
|
||||
had_error++;
|
||||
break;
|
||||
}
|
||||
bp += n;
|
||||
buflen -= n;
|
||||
_map_v4v6_hostent(&host, &bp, &buflen);
|
||||
}
|
||||
h_errno = NETDB_SUCCESS;
|
||||
return (&host);
|
||||
#endif
|
||||
case T_A:
|
||||
case T_AAAA:
|
||||
if (strcasecmp(host.h_name, bp) != 0) {
|
||||
#ifdef _ORG_FREEBSD_
|
||||
syslog(LOG_NOTICE|LOG_AUTH,
|
||||
AskedForGot, host.h_name, bp);
|
||||
#endif
|
||||
cp += n;
|
||||
continue; /* XXX - had_error++ ? */
|
||||
}
|
||||
if (n != host.h_length) {
|
||||
cp += n;
|
||||
continue;
|
||||
}
|
||||
if (!haveanswer) {
|
||||
register int nn;
|
||||
|
||||
host.h_name = bp;
|
||||
nn = (int)strlen(bp) + 1; /* for the \0 */
|
||||
bp += nn;
|
||||
buflen -= nn;
|
||||
}
|
||||
|
||||
bp += sizeof(align) - ((size_t)bp % sizeof(align));
|
||||
|
||||
if (bp + n >= &hostbuf[sizeof hostbuf]) {
|
||||
dprintf("size (%d) too big\n", n);
|
||||
had_error++;
|
||||
continue;
|
||||
}
|
||||
if (hap >= &h_addr_ptrs[MAXADDRS-1]) {
|
||||
if (!toobig++)
|
||||
dprintf("Too many addresses (%d)\n",
|
||||
MAXADDRS);
|
||||
cp += n;
|
||||
continue;
|
||||
}
|
||||
*hap++ = bp;
|
||||
bcopy(cp, bp, n);
|
||||
bp += n;
|
||||
buflen -= n;
|
||||
cp += n;
|
||||
if (cp != erdata) {
|
||||
h_errno = NO_RECOVERY;
|
||||
return (NULL);
|
||||
}
|
||||
break;
|
||||
default:
|
||||
dprintf("Impossible condition (type=%d)\n", type);
|
||||
h_errno = NO_RECOVERY;
|
||||
return (NULL);
|
||||
/* BIND has abort() here, too risky on bad data */
|
||||
}
|
||||
if (!had_error)
|
||||
haveanswer++;
|
||||
}
|
||||
if (haveanswer) {
|
||||
*ap = NULL;
|
||||
*hap = NULL;
|
||||
# if defined(RESOLVSORT)
|
||||
/*
|
||||
* Note: we sort even if host can take only one address
|
||||
* in its return structures - should give it the "best"
|
||||
* address in that case, not some random one
|
||||
*/
|
||||
if (_res.nsort && haveanswer > 1 && qtype == T_A)
|
||||
addrsort(h_addr_ptrs, haveanswer);
|
||||
# endif /*RESOLVSORT*/
|
||||
if (!host.h_name) {
|
||||
n = (int)strlen(qname) + 1; /* for the \0 */
|
||||
if (n > buflen || n >= MAXHOSTNAMELEN)
|
||||
goto no_recovery;
|
||||
strcpy(bp, qname);
|
||||
host.h_name = bp;
|
||||
bp += n;
|
||||
buflen -= n;
|
||||
}
|
||||
if (_res.options & RES_USE_INET6)
|
||||
_map_v4v6_hostent(&host, &bp, &buflen);
|
||||
h_errno = NETDB_SUCCESS;
|
||||
return (&host);
|
||||
}
|
||||
no_recovery:
|
||||
h_errno = NO_RECOVERY;
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
struct hostent *
|
||||
__dns_getanswer(const char *answer, int anslen, const char *qname, int qtype)
|
||||
{
|
||||
switch(qtype) {
|
||||
case T_AAAA:
|
||||
host.h_addrtype = AF_INET6;
|
||||
host.h_length = IN6ADDRSZ;
|
||||
break;
|
||||
case T_A:
|
||||
default:
|
||||
host.h_addrtype = AF_INET;
|
||||
host.h_length = INADDRSZ;
|
||||
break;
|
||||
}
|
||||
|
||||
return(gethostanswer((const querybuf *)answer, anslen, qname, qtype));
|
||||
}
|
||||
|
||||
struct hostent *
|
||||
_gethostbydnsname(const char *name, int af)
|
||||
{
|
||||
querybuf buf;
|
||||
register const char *cp;
|
||||
char *bp;
|
||||
int n, size, type, len;
|
||||
|
||||
if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
|
||||
h_errno = NETDB_INTERNAL;
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
switch (af) {
|
||||
case AF_INET:
|
||||
size = INADDRSZ;
|
||||
type = T_A;
|
||||
break;
|
||||
case AF_INET6:
|
||||
size = IN6ADDRSZ;
|
||||
type = T_AAAA;
|
||||
break;
|
||||
default:
|
||||
h_errno = NETDB_INTERNAL;
|
||||
errno = EAFNOSUPPORT;
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
host.h_addrtype = af;
|
||||
host.h_length = size;
|
||||
|
||||
/*
|
||||
* if there aren't any dots, it could be a user-level alias.
|
||||
* this is also done in res_query() since we are not the only
|
||||
* function that looks up host names.
|
||||
*/
|
||||
if (!strchr(name, '.') && ( NULL != (cp = __hostalias(name))))
|
||||
name = cp;
|
||||
|
||||
/*
|
||||
* disallow names consisting only of digits/dots, unless
|
||||
* they end in a dot.
|
||||
*/
|
||||
if (isdigit(name[0]))
|
||||
for (cp = name;; ++cp) {
|
||||
if (!*cp) {
|
||||
if (*--cp == '.')
|
||||
break;
|
||||
/*
|
||||
* All-numeric, no dot at the end.
|
||||
* Fake up a hostent as if we'd actually
|
||||
* done a lookup.
|
||||
*/
|
||||
if (inet_pton(af, name, host_addr) <= 0) {
|
||||
h_errno = HOST_NOT_FOUND;
|
||||
return (NULL);
|
||||
}
|
||||
strncpy(hostbuf, name, MAXDNAME);
|
||||
hostbuf[MAXDNAME] = '\0';
|
||||
bp = hostbuf + MAXDNAME;
|
||||
len = sizeof hostbuf - MAXDNAME;
|
||||
host.h_name = hostbuf;
|
||||
host.h_aliases = host_aliases;
|
||||
host_aliases[0] = NULL;
|
||||
h_addr_ptrs[0] = (char *)host_addr;
|
||||
h_addr_ptrs[1] = NULL;
|
||||
host.h_addr_list = h_addr_ptrs;
|
||||
if (_res.options & RES_USE_INET6)
|
||||
_map_v4v6_hostent(&host, &bp, &len);
|
||||
h_errno = NETDB_SUCCESS;
|
||||
return (&host);
|
||||
}
|
||||
if (!isdigit(*cp) && *cp != '.')
|
||||
break;
|
||||
}
|
||||
if ((isxdigit(name[0]) && strchr(name, ':') != NULL) ||
|
||||
name[0] == ':')
|
||||
for (cp = name;; ++cp) {
|
||||
if (!*cp) {
|
||||
if (*--cp == '.')
|
||||
break;
|
||||
/*
|
||||
* All-IPv6-legal, no dot at the end.
|
||||
* Fake up a hostent as if we'd actually
|
||||
* done a lookup.
|
||||
*/
|
||||
if (inet_pton(af, name, host_addr) <= 0) {
|
||||
h_errno = HOST_NOT_FOUND;
|
||||
return (NULL);
|
||||
}
|
||||
strncpy(hostbuf, name, MAXDNAME);
|
||||
hostbuf[MAXDNAME] = '\0';
|
||||
bp = hostbuf + MAXDNAME;
|
||||
len = sizeof hostbuf - MAXDNAME;
|
||||
host.h_name = hostbuf;
|
||||
host.h_aliases = host_aliases;
|
||||
host_aliases[0] = NULL;
|
||||
h_addr_ptrs[0] = (char *)host_addr;
|
||||
h_addr_ptrs[1] = NULL;
|
||||
host.h_addr_list = h_addr_ptrs;
|
||||
h_errno = NETDB_SUCCESS;
|
||||
return (&host);
|
||||
}
|
||||
if (!isxdigit(*cp) && *cp != ':' && *cp != '.')
|
||||
break;
|
||||
}
|
||||
|
||||
if ((n = res_search(name, C_IN, type, buf.buf, sizeof(buf))) < 0) {
|
||||
dprintf("res_search failed (%d)\n", n);
|
||||
return (NULL);
|
||||
}
|
||||
return (gethostanswer(&buf, n, name, type));
|
||||
}
|
||||
|
||||
struct hostent *
|
||||
_gethostbydnsaddr(const char *addr, int len, int af)
|
||||
{
|
||||
const u_char *uaddr = (const u_char *)addr;
|
||||
static const u_char mapped[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0xff,0xff };
|
||||
static const u_char tunnelled[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0,0 };
|
||||
int n, size;
|
||||
querybuf buf;
|
||||
register struct hostent *hp;
|
||||
char qbuf[MAXDNAME+1], *qp;
|
||||
#ifdef SUNSECURITY
|
||||
register struct hostent *rhp;
|
||||
char **haddr;
|
||||
u_long old_options;
|
||||
char hname2[MAXDNAME+1];
|
||||
#endif /*SUNSECURITY*/
|
||||
|
||||
if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
|
||||
h_errno = NETDB_INTERNAL;
|
||||
return (NULL);
|
||||
}
|
||||
if (af == AF_INET6 && len == IN6ADDRSZ &&
|
||||
(!bcmp(uaddr, mapped, sizeof mapped) ||
|
||||
!bcmp(uaddr, tunnelled, sizeof tunnelled))) {
|
||||
/* Unmap. */
|
||||
addr += sizeof mapped;
|
||||
uaddr += sizeof mapped;
|
||||
af = AF_INET;
|
||||
len = INADDRSZ;
|
||||
}
|
||||
switch (af) {
|
||||
case AF_INET:
|
||||
size = INADDRSZ;
|
||||
break;
|
||||
case AF_INET6:
|
||||
size = IN6ADDRSZ;
|
||||
break;
|
||||
default:
|
||||
errno = EAFNOSUPPORT;
|
||||
h_errno = NETDB_INTERNAL;
|
||||
return (NULL);
|
||||
}
|
||||
if (size != len) {
|
||||
errno = EINVAL;
|
||||
h_errno = NETDB_INTERNAL;
|
||||
return (NULL);
|
||||
}
|
||||
switch (af) {
|
||||
case AF_INET:
|
||||
(void) sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa",
|
||||
(uaddr[3] & 0xff),
|
||||
(uaddr[2] & 0xff),
|
||||
(uaddr[1] & 0xff),
|
||||
(uaddr[0] & 0xff));
|
||||
break;
|
||||
case AF_INET6:
|
||||
qp = qbuf;
|
||||
for (n = IN6ADDRSZ - 1; n >= 0; n--) {
|
||||
qp += SPRINTF((qp, "%x.%x.",
|
||||
uaddr[n] & 0xf,
|
||||
(uaddr[n] >> 4) & 0xf));
|
||||
}
|
||||
strcpy(qp, "ip6.int");
|
||||
break;
|
||||
default:
|
||||
abort();
|
||||
}
|
||||
n = res_query(qbuf, C_IN, T_PTR, (u_char *)buf.buf, sizeof buf.buf);
|
||||
if (n < 0) {
|
||||
dprintf("res_query failed (%d)\n", n);
|
||||
return (NULL);
|
||||
}
|
||||
if ( NULL == (hp = gethostanswer(&buf, n, qbuf, T_PTR)))
|
||||
return (NULL); /* h_errno was set by gethostanswer() */
|
||||
#ifdef SUNSECURITY
|
||||
if (af == AF_INET) {
|
||||
/*
|
||||
* turn off search as the name should be absolute,
|
||||
* 'localhost' should be matched by defnames
|
||||
*/
|
||||
strncpy(hname2, hp->h_name, MAXDNAME);
|
||||
hname2[MAXDNAME] = '\0';
|
||||
old_options = _res.options;
|
||||
_res.options &= ~RES_DNSRCH;
|
||||
_res.options |= RES_DEFNAMES;
|
||||
if (!(rhp = gethostbyname(hname2))) {
|
||||
#ifdef _ORG_FREEBSD_
|
||||
syslog(LOG_NOTICE|LOG_AUTH,
|
||||
"gethostbyaddr: No A record for %s (verifying [%s])",
|
||||
hname2, inet_ntoa(*((struct in_addr *)addr)));
|
||||
#endif
|
||||
_res.options = old_options;
|
||||
h_errno = HOST_NOT_FOUND;
|
||||
return (NULL);
|
||||
}
|
||||
_res.options = old_options;
|
||||
for (haddr = rhp->h_addr_list; *haddr; haddr++)
|
||||
if (!memcmp(*haddr, addr, INADDRSZ))
|
||||
break;
|
||||
if (!*haddr) {
|
||||
#ifdef _ORG_FREEBSD_
|
||||
syslog(LOG_NOTICE|LOG_AUTH,
|
||||
"gethostbyaddr: A record of %s != PTR record [%s]",
|
||||
hname2, inet_ntoa(*((struct in_addr *)addr)));
|
||||
#endif
|
||||
h_errno = HOST_NOT_FOUND;
|
||||
return (NULL);
|
||||
}
|
||||
}
|
||||
#endif /*SUNSECURITY*/
|
||||
hp->h_addrtype = af;
|
||||
hp->h_length = len;
|
||||
bcopy(addr, host_addr, len);
|
||||
h_addr_ptrs[0] = (char *)host_addr;
|
||||
h_addr_ptrs[1] = NULL;
|
||||
if (af == AF_INET && (_res.options & RES_USE_INET6)) {
|
||||
_map_v4v6_address((char*)host_addr, (char*)host_addr);
|
||||
hp->h_addrtype = AF_INET6;
|
||||
hp->h_length = IN6ADDRSZ;
|
||||
}
|
||||
h_errno = NETDB_SUCCESS;
|
||||
return (hp);
|
||||
}
|
||||
|
||||
#ifdef RESOLVSORT
|
||||
static void
|
||||
addrsort(char **ap, int num)
|
||||
{
|
||||
short i, j;
|
||||
char **p;
|
||||
short aval[MAXADDRS];
|
||||
short needsort = 0;
|
||||
|
||||
p = ap;
|
||||
for (i = 0; i < num; i++, p++) {
|
||||
for (j = 0 ; (unsigned)j < _res.nsort; j++)
|
||||
if (_res.sort_list[j].addr.s_addr ==
|
||||
(((struct in_addr *)(*p))->s_addr & _res.sort_list[j].mask))
|
||||
break;
|
||||
aval[i] = j;
|
||||
if (needsort == 0 && i > 0 && j < aval[i-1])
|
||||
needsort = i;
|
||||
}
|
||||
if (!needsort)
|
||||
return;
|
||||
|
||||
while (needsort < num) {
|
||||
for (j = needsort - 1; j >= 0; j--) {
|
||||
if (aval[j] > aval[j+1]) {
|
||||
char *hp;
|
||||
|
||||
i = aval[j];
|
||||
aval[j] = aval[j+1];
|
||||
aval[j+1] = i;
|
||||
|
||||
hp = ap[j];
|
||||
ap[j] = ap[j+1];
|
||||
ap[j+1] = hp;
|
||||
|
||||
} else
|
||||
break;
|
||||
}
|
||||
needsort++;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
void
|
||||
_sethostdnsent(int stayopen)
|
||||
{
|
||||
if ((_res.options & RES_INIT) == 0 && res_init() == -1)
|
||||
return;
|
||||
if (stayopen)
|
||||
_res.options |= RES_STAYOPEN | RES_USEVC;
|
||||
}
|
||||
|
||||
void
|
||||
_endhostdnsent()
|
||||
{
|
||||
_res.options &= ~(RES_STAYOPEN | RES_USEVC);
|
||||
res_close();
|
||||
}
|
||||
Reference in New Issue
Block a user