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unneback |
/*
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* Copyright (c) 1985, 1989, 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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/*
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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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/*
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* Portions Copyright (c) 1996 by Internet Software Consortium.
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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.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM 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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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)res_send.c 8.1 (Berkeley) 6/4/93";
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static char orig_rcsid[] = "From: Id: res_send.c,v 8.20 1998/04/06 23:27:51 halley Exp $";
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static char rcsid[] = "$Id: res_send.c,v 1.2 2001-09-27 12:01:53 chris Exp $";
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#endif /* LIBC_SCCS and not lint */
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/*
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* Send query to name server and wait for reply.
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*/
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <sys/uio.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <arpa/inet.h>
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| 91 |
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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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#include <poll.h>
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#include "res_config.h"
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| 102 |
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#if !defined(__rtems__)
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#ifdef NOPOLL /* libc_r doesn't wrap poll yet() */
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static int use_poll = 0;
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#else
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static int use_poll = 1; /* adapt to poll() syscall availability */
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/* 0 = not present, 1 = try it, 2 = exists */
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#endif
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#endif
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static int s = -1; /* socket used for communications */
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static int connected = 0; /* is the socket connected */
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static int vc = 0; /* is the socket a virtual circuit? */
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static res_send_qhook Qhook = NULL;
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static res_send_rhook Rhook = NULL;
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| 117 |
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| 118 |
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#define CAN_RECONNECT 1
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#ifndef DEBUG
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# define Dprint(cond, args) /*empty*/
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# define DprintQ(cond, args, query, size) /*empty*/
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# define Aerror(file, string, error, address) /*empty*/
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# define Perror(file, string, error) /*empty*/
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| 125 |
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#else
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| 126 |
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# define Dprint(cond, args) if (cond) {fprintf args;} else {}
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| 127 |
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# define DprintQ(cond, args, query, size) if (cond) {\
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fprintf args;\
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__fp_nquery(query, size, stdout);\
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| 130 |
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} else {}
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static void
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| 132 |
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Aerror(file, string, error, address)
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FILE *file;
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char *string;
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| 135 |
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int error;
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| 136 |
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struct sockaddr_in address;
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{
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| 138 |
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int save = errno;
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| 139 |
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| 140 |
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if (_res.options & RES_DEBUG) {
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| 141 |
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fprintf(file, "res_send: %s ([%s].%u): %s\n",
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string,
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inet_ntoa(address.sin_addr),
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ntohs(address.sin_port),
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strerror(error));
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| 146 |
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}
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| 147 |
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errno = save;
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| 148 |
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}
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| 149 |
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static void
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| 150 |
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Perror(file, string, error)
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| 151 |
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FILE *file;
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| 152 |
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char *string;
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int error;
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| 154 |
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{
|
| 155 |
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int save = errno;
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| 156 |
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| 157 |
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if (_res.options & RES_DEBUG) {
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| 158 |
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fprintf(file, "res_send: %s: %s\n",
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| 159 |
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string, strerror(error));
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| 160 |
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}
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errno = save;
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| 162 |
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}
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| 163 |
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#endif
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| 164 |
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| 165 |
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void
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| 166 |
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res_send_setqhook(hook)
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| 167 |
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res_send_qhook hook;
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| 168 |
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{
|
| 169 |
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| 170 |
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Qhook = hook;
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| 171 |
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}
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| 172 |
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| 173 |
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void
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| 174 |
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res_send_setrhook(hook)
|
| 175 |
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res_send_rhook hook;
|
| 176 |
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{
|
| 177 |
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|
| 178 |
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Rhook = hook;
|
| 179 |
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}
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| 180 |
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| 181 |
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/* int
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| 182 |
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* res_isourserver(ina)
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| 183 |
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* looks up "ina" in _res.ns_addr_list[]
|
| 184 |
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* returns:
|
| 185 |
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* 0 : not found
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| 186 |
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* >0 : found
|
| 187 |
|
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* author:
|
| 188 |
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* paul vixie, 29may94
|
| 189 |
|
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*/
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| 190 |
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int
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| 191 |
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res_isourserver(inp)
|
| 192 |
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const struct sockaddr_in *inp;
|
| 193 |
|
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{
|
| 194 |
|
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struct sockaddr_in ina;
|
| 195 |
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int ns, ret;
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| 196 |
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|
| 197 |
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ina = *inp;
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| 198 |
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ret = 0;
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| 199 |
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for (ns = 0; ns < _res.nscount; ns++) {
|
| 200 |
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const struct sockaddr_in *srv = &_res.nsaddr_list[ns];
|
| 201 |
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|
|
| 202 |
|
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if (srv->sin_family == ina.sin_family &&
|
| 203 |
|
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srv->sin_port == ina.sin_port &&
|
| 204 |
|
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(srv->sin_addr.s_addr == INADDR_ANY ||
|
| 205 |
|
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srv->sin_addr.s_addr == ina.sin_addr.s_addr)) {
|
| 206 |
|
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ret++;
|
| 207 |
|
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break;
|
| 208 |
|
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}
|
| 209 |
|
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}
|
| 210 |
|
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return (ret);
|
| 211 |
|
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}
|
| 212 |
|
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|
| 213 |
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/* int
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| 214 |
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* res_nameinquery(name, type, class, buf, eom)
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| 215 |
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* look for (name,type,class) in the query section of packet (buf,eom)
|
| 216 |
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* requires:
|
| 217 |
|
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* buf + HFIXEDSZ <= eom
|
| 218 |
|
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* returns:
|
| 219 |
|
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* -1 : format error
|
| 220 |
|
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* 0 : not found
|
| 221 |
|
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* >0 : found
|
| 222 |
|
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* author:
|
| 223 |
|
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* paul vixie, 29may94
|
| 224 |
|
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*/
|
| 225 |
|
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int
|
| 226 |
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res_nameinquery(name, type, class, buf, eom)
|
| 227 |
|
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const char *name;
|
| 228 |
|
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int type, class;
|
| 229 |
|
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const u_char *buf, *eom;
|
| 230 |
|
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{
|
| 231 |
|
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const u_char *cp = buf + HFIXEDSZ;
|
| 232 |
|
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int qdcount = ntohs(((HEADER*)buf)->qdcount);
|
| 233 |
|
|
|
| 234 |
|
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while (qdcount-- > 0) {
|
| 235 |
|
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char tname[MAXDNAME+1];
|
| 236 |
|
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int n, ttype, tclass;
|
| 237 |
|
|
|
| 238 |
|
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n = dn_expand(buf, eom, cp, tname, sizeof tname);
|
| 239 |
|
|
if (n < 0)
|
| 240 |
|
|
return (-1);
|
| 241 |
|
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cp += n;
|
| 242 |
|
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if (cp + 2 * INT16SZ > eom)
|
| 243 |
|
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return (-1);
|
| 244 |
|
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ttype = ns_get16(cp); cp += INT16SZ;
|
| 245 |
|
|
tclass = ns_get16(cp); cp += INT16SZ;
|
| 246 |
|
|
if (ttype == type &&
|
| 247 |
|
|
tclass == class &&
|
| 248 |
|
|
strcasecmp(tname, name) == 0)
|
| 249 |
|
|
return (1);
|
| 250 |
|
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}
|
| 251 |
|
|
return (0);
|
| 252 |
|
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}
|
| 253 |
|
|
|
| 254 |
|
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/* int
|
| 255 |
|
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* res_queriesmatch(buf1, eom1, buf2, eom2)
|
| 256 |
|
|
* is there a 1:1 mapping of (name,type,class)
|
| 257 |
|
|
* in (buf1,eom1) and (buf2,eom2)?
|
| 258 |
|
|
* returns:
|
| 259 |
|
|
* -1 : format error
|
| 260 |
|
|
* 0 : not a 1:1 mapping
|
| 261 |
|
|
* >0 : is a 1:1 mapping
|
| 262 |
|
|
* author:
|
| 263 |
|
|
* paul vixie, 29may94
|
| 264 |
|
|
*/
|
| 265 |
|
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int
|
| 266 |
|
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res_queriesmatch(buf1, eom1, buf2, eom2)
|
| 267 |
|
|
const u_char *buf1, *eom1;
|
| 268 |
|
|
const u_char *buf2, *eom2;
|
| 269 |
|
|
{
|
| 270 |
|
|
const u_char *cp = buf1 + HFIXEDSZ;
|
| 271 |
|
|
int qdcount = ntohs(((HEADER*)buf1)->qdcount);
|
| 272 |
|
|
|
| 273 |
|
|
if (buf1 + HFIXEDSZ > eom1 || buf2 + HFIXEDSZ > eom2)
|
| 274 |
|
|
return (-1);
|
| 275 |
|
|
|
| 276 |
|
|
/*
|
| 277 |
|
|
* Only header section present in replies to
|
| 278 |
|
|
* dynamic update packets.
|
| 279 |
|
|
*/
|
| 280 |
|
|
if ( (((HEADER *)buf1)->opcode == ns_o_update) &&
|
| 281 |
|
|
(((HEADER *)buf2)->opcode == ns_o_update) )
|
| 282 |
|
|
return (1);
|
| 283 |
|
|
|
| 284 |
|
|
if (qdcount != ntohs(((HEADER*)buf2)->qdcount))
|
| 285 |
|
|
return (0);
|
| 286 |
|
|
while (qdcount-- > 0) {
|
| 287 |
|
|
char tname[MAXDNAME+1];
|
| 288 |
|
|
int n, ttype, tclass;
|
| 289 |
|
|
|
| 290 |
|
|
n = dn_expand(buf1, eom1, cp, tname, sizeof tname);
|
| 291 |
|
|
if (n < 0)
|
| 292 |
|
|
return (-1);
|
| 293 |
|
|
cp += n;
|
| 294 |
|
|
if (cp + 2 * INT16SZ > eom1)
|
| 295 |
|
|
return (-1);
|
| 296 |
|
|
ttype = ns_get16(cp); cp += INT16SZ;
|
| 297 |
|
|
tclass = ns_get16(cp); cp += INT16SZ;
|
| 298 |
|
|
if (!res_nameinquery(tname, ttype, tclass, buf2, eom2))
|
| 299 |
|
|
return (0);
|
| 300 |
|
|
}
|
| 301 |
|
|
return (1);
|
| 302 |
|
|
}
|
| 303 |
|
|
|
| 304 |
|
|
int
|
| 305 |
|
|
res_send(buf, buflen, ans, anssiz)
|
| 306 |
|
|
const u_char *buf;
|
| 307 |
|
|
int buflen;
|
| 308 |
|
|
u_char *ans;
|
| 309 |
|
|
int anssiz;
|
| 310 |
|
|
{
|
| 311 |
|
|
HEADER *hp = (HEADER *) buf;
|
| 312 |
|
|
HEADER *anhp = (HEADER *) ans;
|
| 313 |
|
|
int gotsomewhere, connreset, terrno, try, v_circuit, resplen, ns, n;
|
| 314 |
|
|
u_int badns; /* XXX NSMAX can't exceed #/bits in this variable */
|
| 315 |
|
|
|
| 316 |
|
|
if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
|
| 317 |
|
|
/* errno should have been set by res_init() in this case. */
|
| 318 |
|
|
return (-1);
|
| 319 |
|
|
}
|
| 320 |
|
|
if (anssiz < HFIXEDSZ) {
|
| 321 |
|
|
errno = EINVAL;
|
| 322 |
|
|
return (-1);
|
| 323 |
|
|
}
|
| 324 |
|
|
DprintQ((_res.options & RES_DEBUG) || (_res.pfcode & RES_PRF_QUERY),
|
| 325 |
|
|
(stdout, ";; res_send()\n"), buf, buflen);
|
| 326 |
|
|
v_circuit = (_res.options & RES_USEVC) || buflen > PACKETSZ;
|
| 327 |
|
|
gotsomewhere = 0;
|
| 328 |
|
|
connreset = 0;
|
| 329 |
|
|
terrno = ETIMEDOUT;
|
| 330 |
|
|
badns = 0;
|
| 331 |
|
|
|
| 332 |
|
|
/*
|
| 333 |
|
|
* Send request, RETRY times, or until successful
|
| 334 |
|
|
*/
|
| 335 |
|
|
for (try = 0; try < _res.retry; try++) {
|
| 336 |
|
|
for (ns = 0; ns < _res.nscount; ns++) {
|
| 337 |
|
|
struct sockaddr_in *nsap = &_res.nsaddr_list[ns];
|
| 338 |
|
|
same_ns:
|
| 339 |
|
|
if (badns & (1 << ns)) {
|
| 340 |
|
|
res_close();
|
| 341 |
|
|
goto next_ns;
|
| 342 |
|
|
}
|
| 343 |
|
|
|
| 344 |
|
|
if (Qhook) {
|
| 345 |
|
|
int done = 0, loops = 0;
|
| 346 |
|
|
|
| 347 |
|
|
do {
|
| 348 |
|
|
res_sendhookact act;
|
| 349 |
|
|
|
| 350 |
|
|
act = (*Qhook)(&nsap, &buf, &buflen,
|
| 351 |
|
|
ans, anssiz, &resplen);
|
| 352 |
|
|
switch (act) {
|
| 353 |
|
|
case res_goahead:
|
| 354 |
|
|
done = 1;
|
| 355 |
|
|
break;
|
| 356 |
|
|
case res_nextns:
|
| 357 |
|
|
res_close();
|
| 358 |
|
|
goto next_ns;
|
| 359 |
|
|
case res_done:
|
| 360 |
|
|
return (resplen);
|
| 361 |
|
|
case res_modified:
|
| 362 |
|
|
/* give the hook another try */
|
| 363 |
|
|
if (++loops < 42) /*doug adams*/
|
| 364 |
|
|
break;
|
| 365 |
|
|
/*FALLTHROUGH*/
|
| 366 |
|
|
case res_error:
|
| 367 |
|
|
/*FALLTHROUGH*/
|
| 368 |
|
|
default:
|
| 369 |
|
|
return (-1);
|
| 370 |
|
|
}
|
| 371 |
|
|
} while (!done);
|
| 372 |
|
|
}
|
| 373 |
|
|
|
| 374 |
|
|
Dprint(_res.options & RES_DEBUG,
|
| 375 |
|
|
(stdout, ";; Querying server (# %d) address = %s\n",
|
| 376 |
|
|
ns + 1, inet_ntoa(nsap->sin_addr)));
|
| 377 |
|
|
|
| 378 |
|
|
if (v_circuit) {
|
| 379 |
|
|
int truncated;
|
| 380 |
|
|
#if !defined(__rtems__)
|
| 381 |
|
|
struct iovec iov[2];
|
| 382 |
|
|
#endif
|
| 383 |
|
|
u_short len;
|
| 384 |
|
|
u_char *cp;
|
| 385 |
|
|
|
| 386 |
|
|
/*
|
| 387 |
|
|
* Use virtual circuit;
|
| 388 |
|
|
* at most one attempt per server.
|
| 389 |
|
|
*/
|
| 390 |
|
|
try = _res.retry;
|
| 391 |
|
|
truncated = 0;
|
| 392 |
|
|
if (s < 0 || !vc || hp->opcode == ns_o_update) {
|
| 393 |
|
|
if (s >= 0)
|
| 394 |
|
|
res_close();
|
| 395 |
|
|
|
| 396 |
|
|
s = socket(PF_INET, SOCK_STREAM, 0);
|
| 397 |
|
|
if (s < 0) {
|
| 398 |
|
|
terrno = errno;
|
| 399 |
|
|
Perror(stderr, "socket(vc)", errno);
|
| 400 |
|
|
return (-1);
|
| 401 |
|
|
}
|
| 402 |
|
|
errno = 0;
|
| 403 |
|
|
if (connect(s, (struct sockaddr *)nsap,
|
| 404 |
|
|
sizeof *nsap) < 0) {
|
| 405 |
|
|
terrno = errno;
|
| 406 |
|
|
Aerror(stderr, "connect/vc",
|
| 407 |
|
|
errno, *nsap);
|
| 408 |
|
|
badns |= (1 << ns);
|
| 409 |
|
|
res_close();
|
| 410 |
|
|
goto next_ns;
|
| 411 |
|
|
}
|
| 412 |
|
|
vc = 1;
|
| 413 |
|
|
}
|
| 414 |
|
|
/*
|
| 415 |
|
|
* Send length & message
|
| 416 |
|
|
*/
|
| 417 |
|
|
putshort((u_short)buflen, (u_char*)&len);
|
| 418 |
|
|
#if !defined(__rtems__)
|
| 419 |
|
|
iov[0].iov_base = (caddr_t)&len;
|
| 420 |
|
|
iov[0].iov_len = INT16SZ;
|
| 421 |
|
|
iov[1].iov_base = (caddr_t)buf;
|
| 422 |
|
|
iov[1].iov_len = buflen;
|
| 423 |
|
|
if (writev(s, iov, 2) != (INT16SZ + buflen)) {
|
| 424 |
|
|
#else
|
| 425 |
|
|
/*
|
| 426 |
|
|
* RTEMS doesn't have writev (yet)
|
| 427 |
|
|
*/
|
| 428 |
|
|
if ((write (s, &len, INT16SZ) != INT16SZ)
|
| 429 |
|
|
|| (write (s, buf, buflen) != buflen)) {
|
| 430 |
|
|
#endif
|
| 431 |
|
|
terrno = errno;
|
| 432 |
|
|
Perror(stderr, "write failed", errno);
|
| 433 |
|
|
badns |= (1 << ns);
|
| 434 |
|
|
res_close();
|
| 435 |
|
|
goto next_ns;
|
| 436 |
|
|
}
|
| 437 |
|
|
/*
|
| 438 |
|
|
* Receive length & response
|
| 439 |
|
|
*/
|
| 440 |
|
|
read_len:
|
| 441 |
|
|
cp = ans;
|
| 442 |
|
|
len = INT16SZ;
|
| 443 |
|
|
while ((n = read(s, (char *)cp, (int)len)) > 0) {
|
| 444 |
|
|
cp += n;
|
| 445 |
|
|
if ((len -= n) <= 0)
|
| 446 |
|
|
break;
|
| 447 |
|
|
}
|
| 448 |
|
|
if (n <= 0) {
|
| 449 |
|
|
terrno = errno;
|
| 450 |
|
|
Perror(stderr, "read failed", errno);
|
| 451 |
|
|
res_close();
|
| 452 |
|
|
/*
|
| 453 |
|
|
* A long running process might get its TCP
|
| 454 |
|
|
* connection reset if the remote server was
|
| 455 |
|
|
* restarted. Requery the server instead of
|
| 456 |
|
|
* trying a new one. When there is only one
|
| 457 |
|
|
* server, this means that a query might work
|
| 458 |
|
|
* instead of failing. We only allow one reset
|
| 459 |
|
|
* per query to prevent looping.
|
| 460 |
|
|
*/
|
| 461 |
|
|
if (terrno == ECONNRESET && !connreset) {
|
| 462 |
|
|
connreset = 1;
|
| 463 |
|
|
res_close();
|
| 464 |
|
|
goto same_ns;
|
| 465 |
|
|
}
|
| 466 |
|
|
res_close();
|
| 467 |
|
|
goto next_ns;
|
| 468 |
|
|
}
|
| 469 |
|
|
resplen = ns_get16(ans);
|
| 470 |
|
|
if (resplen > anssiz) {
|
| 471 |
|
|
Dprint(_res.options & RES_DEBUG,
|
| 472 |
|
|
(stdout, ";; response truncated\n")
|
| 473 |
|
|
);
|
| 474 |
|
|
truncated = 1;
|
| 475 |
|
|
len = anssiz;
|
| 476 |
|
|
} else
|
| 477 |
|
|
len = resplen;
|
| 478 |
|
|
if (len < HFIXEDSZ) {
|
| 479 |
|
|
/*
|
| 480 |
|
|
* Undersized message.
|
| 481 |
|
|
*/
|
| 482 |
|
|
Dprint(_res.options & RES_DEBUG,
|
| 483 |
|
|
(stdout, ";; undersized: %d\n", len));
|
| 484 |
|
|
terrno = EMSGSIZE;
|
| 485 |
|
|
badns |= (1 << ns);
|
| 486 |
|
|
res_close();
|
| 487 |
|
|
goto next_ns;
|
| 488 |
|
|
}
|
| 489 |
|
|
cp = ans;
|
| 490 |
|
|
while (len != 0 &&
|
| 491 |
|
|
(n = read(s, (char *)cp, (int)len)) > 0) {
|
| 492 |
|
|
cp += n;
|
| 493 |
|
|
len -= n;
|
| 494 |
|
|
}
|
| 495 |
|
|
if (n <= 0) {
|
| 496 |
|
|
terrno = errno;
|
| 497 |
|
|
Perror(stderr, "read(vc)", errno);
|
| 498 |
|
|
res_close();
|
| 499 |
|
|
goto next_ns;
|
| 500 |
|
|
}
|
| 501 |
|
|
if (truncated) {
|
| 502 |
|
|
/*
|
| 503 |
|
|
* Flush rest of answer
|
| 504 |
|
|
* so connection stays in synch.
|
| 505 |
|
|
*/
|
| 506 |
|
|
anhp->tc = 1;
|
| 507 |
|
|
len = resplen - anssiz;
|
| 508 |
|
|
while (len != 0) {
|
| 509 |
|
|
char junk[PACKETSZ];
|
| 510 |
|
|
|
| 511 |
|
|
n = (len > sizeof(junk)
|
| 512 |
|
|
? sizeof(junk)
|
| 513 |
|
|
: len);
|
| 514 |
|
|
if ((n = read(s, junk, n)) > 0)
|
| 515 |
|
|
len -= n;
|
| 516 |
|
|
else
|
| 517 |
|
|
break;
|
| 518 |
|
|
}
|
| 519 |
|
|
}
|
| 520 |
|
|
/*
|
| 521 |
|
|
* The calling applicating has bailed out of
|
| 522 |
|
|
* a previous call and failed to arrange to have
|
| 523 |
|
|
* the circuit closed or the server has got
|
| 524 |
|
|
* itself confused. Anyway drop the packet and
|
| 525 |
|
|
* wait for the correct one.
|
| 526 |
|
|
*/
|
| 527 |
|
|
if (hp->id != anhp->id) {
|
| 528 |
|
|
DprintQ((_res.options & RES_DEBUG) ||
|
| 529 |
|
|
(_res.pfcode & RES_PRF_REPLY),
|
| 530 |
|
|
(stdout, ";; old answer (unexpected):\n"),
|
| 531 |
|
|
ans, (resplen>anssiz)?anssiz:resplen);
|
| 532 |
|
|
goto read_len;
|
| 533 |
|
|
}
|
| 534 |
|
|
} else {
|
| 535 |
|
|
/*
|
| 536 |
|
|
* Use datagrams.
|
| 537 |
|
|
*/
|
| 538 |
|
|
#ifndef NOPOLL
|
| 539 |
|
|
struct pollfd pfd;
|
| 540 |
|
|
int msec;
|
| 541 |
|
|
#endif
|
| 542 |
|
|
struct timeval timeout;
|
| 543 |
|
|
#ifndef NOSELECT
|
| 544 |
|
|
fd_set dsmask, *dsmaskp;
|
| 545 |
|
|
int dsmasklen;
|
| 546 |
|
|
#endif
|
| 547 |
|
|
struct sockaddr_in from;
|
| 548 |
|
|
int fromlen;
|
| 549 |
|
|
|
| 550 |
|
|
if ((s < 0) || vc) {
|
| 551 |
|
|
if (vc)
|
| 552 |
|
|
res_close();
|
| 553 |
|
|
s = socket(PF_INET, SOCK_DGRAM, 0);
|
| 554 |
|
|
if (s < 0) {
|
| 555 |
|
|
#ifndef CAN_RECONNECT
|
| 556 |
|
|
bad_dg_sock:
|
| 557 |
|
|
#endif
|
| 558 |
|
|
terrno = errno;
|
| 559 |
|
|
Perror(stderr, "socket(dg)", errno);
|
| 560 |
|
|
return (-1);
|
| 561 |
|
|
}
|
| 562 |
|
|
connected = 0;
|
| 563 |
|
|
}
|
| 564 |
|
|
#ifndef CANNOT_CONNECT_DGRAM
|
| 565 |
|
|
/*
|
| 566 |
|
|
* On a 4.3BSD+ machine (client and server,
|
| 567 |
|
|
* actually), sending to a nameserver datagram
|
| 568 |
|
|
* port with no nameserver will cause an
|
| 569 |
|
|
* ICMP port unreachable message to be returned.
|
| 570 |
|
|
* If our datagram socket is "connected" to the
|
| 571 |
|
|
* server, we get an ECONNREFUSED error on the next
|
| 572 |
|
|
* socket operation, and select returns if the
|
| 573 |
|
|
* error message is received. We can thus detect
|
| 574 |
|
|
* the absence of a nameserver without timing out.
|
| 575 |
|
|
* If we have sent queries to at least two servers,
|
| 576 |
|
|
* however, we don't want to remain connected,
|
| 577 |
|
|
* as we wish to receive answers from the first
|
| 578 |
|
|
* server to respond.
|
| 579 |
|
|
*/
|
| 580 |
|
|
if (_res.nscount == 1 || (try == 0 && ns == 0)) {
|
| 581 |
|
|
/*
|
| 582 |
|
|
* Connect only if we are sure we won't
|
| 583 |
|
|
* receive a response from another server.
|
| 584 |
|
|
*/
|
| 585 |
|
|
if (!connected) {
|
| 586 |
|
|
if (connect(s, (struct sockaddr *)nsap,
|
| 587 |
|
|
sizeof *nsap
|
| 588 |
|
|
) < 0) {
|
| 589 |
|
|
Aerror(stderr,
|
| 590 |
|
|
"connect(dg)",
|
| 591 |
|
|
errno, *nsap);
|
| 592 |
|
|
badns |= (1 << ns);
|
| 593 |
|
|
res_close();
|
| 594 |
|
|
goto next_ns;
|
| 595 |
|
|
}
|
| 596 |
|
|
connected = 1;
|
| 597 |
|
|
}
|
| 598 |
|
|
if (send(s, (char*)buf, buflen, 0) != buflen) {
|
| 599 |
|
|
Perror(stderr, "send", errno);
|
| 600 |
|
|
badns |= (1 << ns);
|
| 601 |
|
|
res_close();
|
| 602 |
|
|
goto next_ns;
|
| 603 |
|
|
}
|
| 604 |
|
|
} else {
|
| 605 |
|
|
/*
|
| 606 |
|
|
* Disconnect if we want to listen
|
| 607 |
|
|
* for responses from more than one server.
|
| 608 |
|
|
*/
|
| 609 |
|
|
if (connected) {
|
| 610 |
|
|
#ifdef CAN_RECONNECT
|
| 611 |
|
|
struct sockaddr_in no_addr;
|
| 612 |
|
|
|
| 613 |
|
|
no_addr.sin_family = AF_INET;
|
| 614 |
|
|
no_addr.sin_addr.s_addr = INADDR_ANY;
|
| 615 |
|
|
no_addr.sin_port = 0;
|
| 616 |
|
|
(void) connect(s,
|
| 617 |
|
|
(struct sockaddr *)
|
| 618 |
|
|
&no_addr,
|
| 619 |
|
|
sizeof no_addr);
|
| 620 |
|
|
#else
|
| 621 |
|
|
int s1 = socket(PF_INET, SOCK_DGRAM,0);
|
| 622 |
|
|
if (s1 < 0)
|
| 623 |
|
|
goto bad_dg_sock;
|
| 624 |
|
|
(void) dup2(s1, s);
|
| 625 |
|
|
(void) close(s1);
|
| 626 |
|
|
Dprint(_res.options & RES_DEBUG,
|
| 627 |
|
|
(stdout, ";; new DG socket\n"))
|
| 628 |
|
|
#endif /* CAN_RECONNECT */
|
| 629 |
|
|
connected = 0;
|
| 630 |
|
|
errno = 0;
|
| 631 |
|
|
}
|
| 632 |
|
|
#endif /* !CANNOT_CONNECT_DGRAM */
|
| 633 |
|
|
if (sendto(s, (char*)buf, buflen, 0,
|
| 634 |
|
|
(struct sockaddr *)nsap,
|
| 635 |
|
|
sizeof *nsap)
|
| 636 |
|
|
!= buflen) {
|
| 637 |
|
|
Aerror(stderr, "sendto", errno, *nsap);
|
| 638 |
|
|
badns |= (1 << ns);
|
| 639 |
|
|
res_close();
|
| 640 |
|
|
goto next_ns;
|
| 641 |
|
|
}
|
| 642 |
|
|
#ifndef CANNOT_CONNECT_DGRAM
|
| 643 |
|
|
}
|
| 644 |
|
|
#endif /* !CANNOT_CONNECT_DGRAM */
|
| 645 |
|
|
|
| 646 |
|
|
/*
|
| 647 |
|
|
* Wait for reply
|
| 648 |
|
|
*/
|
| 649 |
|
|
#ifndef NOPOLL
|
| 650 |
|
|
othersyscall:
|
| 651 |
|
|
if (use_poll) {
|
| 652 |
|
|
msec = (_res.retrans << try) * 1000;
|
| 653 |
|
|
if (try > 0)
|
| 654 |
|
|
msec /= _res.nscount;
|
| 655 |
|
|
if (msec <= 0)
|
| 656 |
|
|
msec = 1000;
|
| 657 |
|
|
} else {
|
| 658 |
|
|
#endif
|
| 659 |
|
|
timeout.tv_sec = (_res.retrans << try);
|
| 660 |
|
|
if (try > 0)
|
| 661 |
|
|
timeout.tv_sec /= _res.nscount;
|
| 662 |
|
|
if ((long) timeout.tv_sec <= 0)
|
| 663 |
|
|
timeout.tv_sec = 1;
|
| 664 |
|
|
timeout.tv_usec = 0;
|
| 665 |
|
|
#ifndef NOPOLL
|
| 666 |
|
|
}
|
| 667 |
|
|
#endif
|
| 668 |
|
|
wait:
|
| 669 |
|
|
if (s < 0) {
|
| 670 |
|
|
Perror(stderr, "s out-of-bounds", EMFILE);
|
| 671 |
|
|
res_close();
|
| 672 |
|
|
goto next_ns;
|
| 673 |
|
|
}
|
| 674 |
|
|
#ifndef NOPOLL
|
| 675 |
|
|
if (use_poll) {
|
| 676 |
|
|
struct sigaction sa, osa;
|
| 677 |
|
|
int sigsys_installed = 0;
|
| 678 |
|
|
|
| 679 |
|
|
pfd.fd = s;
|
| 680 |
|
|
pfd.events = POLLIN;
|
| 681 |
|
|
if (use_poll == 1) {
|
| 682 |
|
|
bzero(&sa, sizeof(sa));
|
| 683 |
|
|
sa.sa_handler = SIG_IGN;
|
| 684 |
|
|
if (sigaction(SIGSYS, &sa, &osa) >= 0)
|
| 685 |
|
|
sigsys_installed = 1;
|
| 686 |
|
|
}
|
| 687 |
|
|
n = poll(&pfd, 1, msec);
|
| 688 |
|
|
if (sigsys_installed == 1) {
|
| 689 |
|
|
int oerrno = errno;
|
| 690 |
|
|
sigaction(SIGSYS, &osa, NULL);
|
| 691 |
|
|
errno = oerrno;
|
| 692 |
|
|
}
|
| 693 |
|
|
/* XXX why does nosys() return EINVAL? */
|
| 694 |
|
|
if (n < 0 && (errno == ENOSYS ||
|
| 695 |
|
|
errno == EINVAL)) {
|
| 696 |
|
|
use_poll = 0;
|
| 697 |
|
|
goto othersyscall;
|
| 698 |
|
|
} else if (use_poll == 1)
|
| 699 |
|
|
use_poll = 2;
|
| 700 |
|
|
if (n < 0) {
|
| 701 |
|
|
if (errno == EINTR)
|
| 702 |
|
|
goto wait;
|
| 703 |
|
|
Perror(stderr, "poll", errno);
|
| 704 |
|
|
res_close();
|
| 705 |
|
|
goto next_ns;
|
| 706 |
|
|
}
|
| 707 |
|
|
} else {
|
| 708 |
|
|
#endif
|
| 709 |
|
|
#ifndef NOSELECT
|
| 710 |
|
|
dsmasklen = howmany(s + 1, NFDBITS) *
|
| 711 |
|
|
sizeof(fd_mask);
|
| 712 |
|
|
if (dsmasklen > sizeof(fd_set)) {
|
| 713 |
|
|
dsmaskp = (fd_set *)malloc(dsmasklen);
|
| 714 |
|
|
if (dsmaskp == NULL) {
|
| 715 |
|
|
res_close();
|
| 716 |
|
|
goto next_ns;
|
| 717 |
|
|
}
|
| 718 |
|
|
} else
|
| 719 |
|
|
dsmaskp = &dsmask;
|
| 720 |
|
|
/* only zero what we need */
|
| 721 |
|
|
bzero((char *)dsmaskp, dsmasklen);
|
| 722 |
|
|
FD_SET(s, dsmaskp);
|
| 723 |
|
|
n = select(s + 1, dsmaskp, (fd_set *)NULL,
|
| 724 |
|
|
(fd_set *)NULL, &timeout);
|
| 725 |
|
|
if (dsmaskp != &dsmask)
|
| 726 |
|
|
free(dsmaskp);
|
| 727 |
|
|
if (n < 0) {
|
| 728 |
|
|
if (errno == EINTR)
|
| 729 |
|
|
goto wait;
|
| 730 |
|
|
Perror(stderr, "select", errno);
|
| 731 |
|
|
res_close();
|
| 732 |
|
|
goto next_ns;
|
| 733 |
|
|
}
|
| 734 |
|
|
#endif
|
| 735 |
|
|
#ifndef NOPOLL
|
| 736 |
|
|
}
|
| 737 |
|
|
#endif
|
| 738 |
|
|
|
| 739 |
|
|
#ifdef NOSELECT
|
| 740 |
|
|
setsockopt (s, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof timeout);
|
| 741 |
|
|
#else
|
| 742 |
|
|
if (n == 0) {
|
| 743 |
|
|
/*
|
| 744 |
|
|
* timeout
|
| 745 |
|
|
*/
|
| 746 |
|
|
Dprint(_res.options & RES_DEBUG,
|
| 747 |
|
|
(stdout, ";; timeout\n"));
|
| 748 |
|
|
gotsomewhere = 1;
|
| 749 |
|
|
res_close();
|
| 750 |
|
|
goto next_ns;
|
| 751 |
|
|
}
|
| 752 |
|
|
#endif
|
| 753 |
|
|
errno = 0;
|
| 754 |
|
|
fromlen = sizeof(struct sockaddr_in);
|
| 755 |
|
|
resplen = recvfrom(s, (char*)ans, anssiz, 0,
|
| 756 |
|
|
(struct sockaddr *)&from, &fromlen);
|
| 757 |
|
|
if (resplen <= 0) {
|
| 758 |
|
|
#ifdef NOSELECT
|
| 759 |
|
|
if (errno == ETIMEDOUT) {
|
| 760 |
|
|
Dprint(_res.options & RES_DEBUG,
|
| 761 |
|
|
(stdout, ";; timeout\n"));
|
| 762 |
|
|
gotsomewhere = 1;
|
| 763 |
|
|
res_close();
|
| 764 |
|
|
goto next_ns;
|
| 765 |
|
|
}
|
| 766 |
|
|
#endif
|
| 767 |
|
|
Perror(stderr, "recvfrom", errno);
|
| 768 |
|
|
res_close();
|
| 769 |
|
|
goto next_ns;
|
| 770 |
|
|
}
|
| 771 |
|
|
gotsomewhere = 1;
|
| 772 |
|
|
if (resplen < HFIXEDSZ) {
|
| 773 |
|
|
/*
|
| 774 |
|
|
* Undersized message.
|
| 775 |
|
|
*/
|
| 776 |
|
|
Dprint(_res.options & RES_DEBUG,
|
| 777 |
|
|
(stdout, ";; undersized: %d\n",
|
| 778 |
|
|
resplen));
|
| 779 |
|
|
terrno = EMSGSIZE;
|
| 780 |
|
|
badns |= (1 << ns);
|
| 781 |
|
|
res_close();
|
| 782 |
|
|
goto next_ns;
|
| 783 |
|
|
}
|
| 784 |
|
|
if (hp->id != anhp->id) {
|
| 785 |
|
|
/*
|
| 786 |
|
|
* response from old query, ignore it.
|
| 787 |
|
|
* XXX - potential security hazard could
|
| 788 |
|
|
* be detected here.
|
| 789 |
|
|
*/
|
| 790 |
|
|
DprintQ((_res.options & RES_DEBUG) ||
|
| 791 |
|
|
(_res.pfcode & RES_PRF_REPLY),
|
| 792 |
|
|
(stdout, ";; old answer:\n"),
|
| 793 |
|
|
ans, (resplen>anssiz)?anssiz:resplen);
|
| 794 |
|
|
goto wait;
|
| 795 |
|
|
}
|
| 796 |
|
|
#ifdef CHECK_SRVR_ADDR
|
| 797 |
|
|
if (!(_res.options & RES_INSECURE1) &&
|
| 798 |
|
|
!res_isourserver(&from)) {
|
| 799 |
|
|
/*
|
| 800 |
|
|
* response from wrong server? ignore it.
|
| 801 |
|
|
* XXX - potential security hazard could
|
| 802 |
|
|
* be detected here.
|
| 803 |
|
|
*/
|
| 804 |
|
|
DprintQ((_res.options & RES_DEBUG) ||
|
| 805 |
|
|
(_res.pfcode & RES_PRF_REPLY),
|
| 806 |
|
|
(stdout, ";; not our server:\n"),
|
| 807 |
|
|
ans, (resplen>anssiz)?anssiz:resplen);
|
| 808 |
|
|
goto wait;
|
| 809 |
|
|
}
|
| 810 |
|
|
#endif
|
| 811 |
|
|
if (!(_res.options & RES_INSECURE2) &&
|
| 812 |
|
|
!res_queriesmatch(buf, buf + buflen,
|
| 813 |
|
|
ans, ans + anssiz)) {
|
| 814 |
|
|
/*
|
| 815 |
|
|
* response contains wrong query? ignore it.
|
| 816 |
|
|
* XXX - potential security hazard could
|
| 817 |
|
|
* be detected here.
|
| 818 |
|
|
*/
|
| 819 |
|
|
DprintQ((_res.options & RES_DEBUG) ||
|
| 820 |
|
|
(_res.pfcode & RES_PRF_REPLY),
|
| 821 |
|
|
(stdout, ";; wrong query name:\n"),
|
| 822 |
|
|
ans, (resplen>anssiz)?anssiz:resplen);
|
| 823 |
|
|
goto wait;
|
| 824 |
|
|
}
|
| 825 |
|
|
if (anhp->rcode == SERVFAIL ||
|
| 826 |
|
|
anhp->rcode == NOTIMP ||
|
| 827 |
|
|
anhp->rcode == REFUSED) {
|
| 828 |
|
|
DprintQ(_res.options & RES_DEBUG,
|
| 829 |
|
|
(stdout, "server rejected query:\n"),
|
| 830 |
|
|
ans, (resplen>anssiz)?anssiz:resplen);
|
| 831 |
|
|
badns |= (1 << ns);
|
| 832 |
|
|
res_close();
|
| 833 |
|
|
/* don't retry if called from dig */
|
| 834 |
|
|
if (!_res.pfcode)
|
| 835 |
|
|
goto next_ns;
|
| 836 |
|
|
}
|
| 837 |
|
|
if (!(_res.options & RES_IGNTC) && anhp->tc) {
|
| 838 |
|
|
/*
|
| 839 |
|
|
* get rest of answer;
|
| 840 |
|
|
* use TCP with same server.
|
| 841 |
|
|
*/
|
| 842 |
|
|
Dprint(_res.options & RES_DEBUG,
|
| 843 |
|
|
(stdout, ";; truncated answer\n"));
|
| 844 |
|
|
v_circuit = 1;
|
| 845 |
|
|
res_close();
|
| 846 |
|
|
goto same_ns;
|
| 847 |
|
|
}
|
| 848 |
|
|
} /*if vc/dg*/
|
| 849 |
|
|
Dprint((_res.options & RES_DEBUG) ||
|
| 850 |
|
|
((_res.pfcode & RES_PRF_REPLY) &&
|
| 851 |
|
|
(_res.pfcode & RES_PRF_HEAD1)),
|
| 852 |
|
|
(stdout, ";; got answer:\n"));
|
| 853 |
|
|
DprintQ((_res.options & RES_DEBUG) ||
|
| 854 |
|
|
(_res.pfcode & RES_PRF_REPLY),
|
| 855 |
|
|
(stdout, "%s", ""),
|
| 856 |
|
|
ans, (resplen>anssiz)?anssiz:resplen);
|
| 857 |
|
|
/*
|
| 858 |
|
|
* If using virtual circuits, we assume that the first server
|
| 859 |
|
|
* is preferred over the rest (i.e. it is on the local
|
| 860 |
|
|
* machine) and only keep that one open.
|
| 861 |
|
|
* If we have temporarily opened a virtual circuit,
|
| 862 |
|
|
* or if we haven't been asked to keep a socket open,
|
| 863 |
|
|
* close the socket.
|
| 864 |
|
|
*/
|
| 865 |
|
|
if ((v_circuit && (!(_res.options & RES_USEVC) || ns != 0)) ||
|
| 866 |
|
|
!(_res.options & RES_STAYOPEN)) {
|
| 867 |
|
|
res_close();
|
| 868 |
|
|
}
|
| 869 |
|
|
if (Rhook) {
|
| 870 |
|
|
int done = 0, loops = 0;
|
| 871 |
|
|
|
| 872 |
|
|
do {
|
| 873 |
|
|
res_sendhookact act;
|
| 874 |
|
|
|
| 875 |
|
|
act = (*Rhook)(nsap, buf, buflen,
|
| 876 |
|
|
ans, anssiz, &resplen);
|
| 877 |
|
|
switch (act) {
|
| 878 |
|
|
case res_goahead:
|
| 879 |
|
|
case res_done:
|
| 880 |
|
|
done = 1;
|
| 881 |
|
|
break;
|
| 882 |
|
|
case res_nextns:
|
| 883 |
|
|
res_close();
|
| 884 |
|
|
goto next_ns;
|
| 885 |
|
|
case res_modified:
|
| 886 |
|
|
/* give the hook another try */
|
| 887 |
|
|
if (++loops < 42) /*doug adams*/
|
| 888 |
|
|
break;
|
| 889 |
|
|
/*FALLTHROUGH*/
|
| 890 |
|
|
case res_error:
|
| 891 |
|
|
/*FALLTHROUGH*/
|
| 892 |
|
|
default:
|
| 893 |
|
|
return (-1);
|
| 894 |
|
|
}
|
| 895 |
|
|
} while (!done);
|
| 896 |
|
|
|
| 897 |
|
|
}
|
| 898 |
|
|
return (resplen);
|
| 899 |
|
|
next_ns: ;
|
| 900 |
|
|
} /*foreach ns*/
|
| 901 |
|
|
} /*foreach retry*/
|
| 902 |
|
|
res_close();
|
| 903 |
|
|
if (!v_circuit) {
|
| 904 |
|
|
if (!gotsomewhere)
|
| 905 |
|
|
errno = ECONNREFUSED; /* no nameservers found */
|
| 906 |
|
|
else
|
| 907 |
|
|
errno = ETIMEDOUT; /* no answer obtained */
|
| 908 |
|
|
} else
|
| 909 |
|
|
errno = terrno;
|
| 910 |
|
|
return (-1);
|
| 911 |
|
|
}
|
| 912 |
|
|
|
| 913 |
|
|
/*
|
| 914 |
|
|
* This routine is for closing the socket if a virtual circuit is used and
|
| 915 |
|
|
* the program wants to close it. This provides support for endhostent()
|
| 916 |
|
|
* which expects to close the socket.
|
| 917 |
|
|
*
|
| 918 |
|
|
* This routine is not expected to be user visible.
|
| 919 |
|
|
*/
|
| 920 |
|
|
void
|
| 921 |
|
|
res_close()
|
| 922 |
|
|
{
|
| 923 |
|
|
if (s >= 0) {
|
| 924 |
|
|
(void) close(s);
|
| 925 |
|
|
s = -1;
|
| 926 |
|
|
connected = 0;
|
| 927 |
|
|
vc = 0;
|
| 928 |
|
|
}
|
| 929 |
|
|
}
|
