mirror of
https://github.com/autc04/Retro68.git
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1117 lines
29 KiB
C
1117 lines
29 KiB
C
/*
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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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* 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) 1996-1999 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 const char sccsid[] = "@(#)res_send.c 8.1 (Berkeley) 6/4/93";
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static const char rcsid[] = "$BINDId: res_send.c,v 8.38 2000/03/30 20:16:51 vixie Exp $";
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#endif /* LIBC_SCCS and not lint */
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#define s6_addr32 __u6_addr.__u6_addr32
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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 <assert.h>
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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 <sys/poll.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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#include <sys/ioctl.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <netdb.h>
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#include <resolv.h>
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#include <signal.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 "libc-symbols.h"
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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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/* From ev_streams.c. */
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static inline void
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__attribute ((always_inline))
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evConsIovec(void *buf, size_t cnt, struct iovec *vec) {
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memset(vec, 0xf5, sizeof (*vec));
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vec->iov_base = buf;
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vec->iov_len = cnt;
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}
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/* From ev_timers.c. */
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#define BILLION 1000000000
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static inline void
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evConsTime(struct timespec *res, time_t sec, long nsec) {
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res->tv_sec = sec;
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res->tv_nsec = nsec;
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}
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static inline void
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evAddTime(struct timespec *res, const struct timespec *addend1,
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const struct timespec *addend2) {
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res->tv_sec = addend1->tv_sec + addend2->tv_sec;
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res->tv_nsec = addend1->tv_nsec + addend2->tv_nsec;
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if (res->tv_nsec >= BILLION) {
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res->tv_sec++;
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res->tv_nsec -= BILLION;
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}
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}
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static inline void
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evSubTime(struct timespec *res, const struct timespec *minuend,
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const struct timespec *subtrahend) {
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res->tv_sec = minuend->tv_sec - subtrahend->tv_sec;
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if (minuend->tv_nsec >= subtrahend->tv_nsec)
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res->tv_nsec = minuend->tv_nsec - subtrahend->tv_nsec;
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else {
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res->tv_nsec = (BILLION
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- subtrahend->tv_nsec + minuend->tv_nsec);
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res->tv_sec--;
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}
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}
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static inline int
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evCmpTime(struct timespec a, struct timespec b) {
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long x = a.tv_sec - b.tv_sec;
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if (x == 0L)
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x = a.tv_nsec - b.tv_nsec;
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return (x < 0L ? (-1) : x > 0L ? (1) : (0));
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}
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static inline void
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evNowTime(struct timespec *res) {
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struct timeval now;
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if (gettimeofday(&now, NULL) < 0)
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evConsTime(res, 0, 0);
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else
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TIMEVAL_TO_TIMESPEC (&now, res);
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}
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/* Options. Leave them on. */
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/* #undef DEBUG */
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#include "res_debug.h"
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#define EXT(res) ((res)->_u._ext)
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/* Forward. */
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static int send_vc(res_state, const u_char *, int,
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u_char **, int *, int *, int, u_char **);
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static int send_dg(res_state, const u_char *, int,
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u_char **, int *, int *, int,
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int *, int *, u_char **);
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#ifdef DEBUG
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static void Aerror(const res_state, FILE *, const char *, int,
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const struct sockaddr *);
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static void Perror(const res_state, FILE *, const char *, int);
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#endif
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static int sock_eq(struct sockaddr_in6 *, struct sockaddr_in6 *);
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/* Reachover. */
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static void convaddr4to6(struct sockaddr_in6 *sa);
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void res_pquery(const res_state, const u_char *, int, FILE *);
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/* Public. */
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/* int
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* res_isourserver(ina)
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* looks up "ina" in _res.ns_addr_list[]
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* returns:
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* 0 : not found
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* >0 : found
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* author:
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* paul vixie, 29may94
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*/
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int
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res_ourserver_p(const res_state statp, const struct sockaddr_in6 *inp)
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{
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int ns;
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if (inp->sin6_family == AF_INET) {
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struct sockaddr_in *in4p = (struct sockaddr_in *) inp;
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in_port_t port = in4p->sin_port;
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in_addr_t addr = in4p->sin_addr.s_addr;
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for (ns = 0; ns < MAXNS; ns++) {
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const struct sockaddr_in *srv =
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(struct sockaddr_in *)EXT(statp).nsaddrs[ns];
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if ((srv != NULL) && (srv->sin_family == AF_INET) &&
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(srv->sin_port == port) &&
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(srv->sin_addr.s_addr == INADDR_ANY ||
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srv->sin_addr.s_addr == addr))
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return (1);
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}
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} else if (inp->sin6_family == AF_INET6) {
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for (ns = 0; ns < MAXNS; ns++) {
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const struct sockaddr_in6 *srv = EXT(statp).nsaddrs[ns];
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if ((srv != NULL) && (srv->sin6_family == AF_INET6) &&
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(srv->sin6_port == inp->sin6_port) &&
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!(memcmp(&srv->sin6_addr, &in6addr_any,
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sizeof (struct in6_addr)) &&
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memcmp(&srv->sin6_addr, &inp->sin6_addr,
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sizeof (struct in6_addr))))
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return (1);
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}
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}
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return (0);
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}
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/* int
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* res_nameinquery(name, type, class, buf, eom)
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* look for (name,type,class) in the query section of packet (buf,eom)
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* requires:
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* buf + HFIXEDSZ <= eom
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* returns:
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* -1 : format error
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* 0 : not found
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* >0 : found
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* author:
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* paul vixie, 29may94
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*/
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int
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res_nameinquery(const char *name, int type, int class,
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const u_char *buf, const u_char *eom)
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{
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const u_char *cp = buf + HFIXEDSZ;
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int qdcount = ntohs(((HEADER*)buf)->qdcount);
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while (qdcount-- > 0) {
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char tname[MAXDNAME+1];
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int n, ttype, tclass;
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n = dn_expand(buf, eom, cp, tname, sizeof tname);
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if (n < 0)
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return (-1);
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cp += n;
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if (cp + 2 * INT16SZ > eom)
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return (-1);
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ttype = ns_get16(cp); cp += INT16SZ;
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tclass = ns_get16(cp); cp += INT16SZ;
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if (ttype == type && tclass == class &&
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ns_samename(tname, name) == 1)
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return (1);
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}
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return (0);
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}
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libresolv_hidden_def (res_nameinquery)
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/* int
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* res_queriesmatch(buf1, eom1, buf2, eom2)
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* is there a 1:1 mapping of (name,type,class)
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* in (buf1,eom1) and (buf2,eom2)?
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* returns:
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* -1 : format error
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* 0 : not a 1:1 mapping
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* >0 : is a 1:1 mapping
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* author:
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* paul vixie, 29may94
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*/
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int
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res_queriesmatch(const u_char *buf1, const u_char *eom1,
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const u_char *buf2, const u_char *eom2)
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{
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const u_char *cp = buf1 + HFIXEDSZ;
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int qdcount = ntohs(((HEADER*)buf1)->qdcount);
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if (buf1 + HFIXEDSZ > eom1 || buf2 + HFIXEDSZ > eom2)
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return (-1);
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/*
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* Only header section present in replies to
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* dynamic update packets.
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*/
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if ((((HEADER *)buf1)->opcode == ns_o_update) &&
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(((HEADER *)buf2)->opcode == ns_o_update))
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return (1);
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if (qdcount != ntohs(((HEADER*)buf2)->qdcount))
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return (0);
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while (qdcount-- > 0) {
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char tname[MAXDNAME+1];
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int n, ttype, tclass;
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n = dn_expand(buf1, eom1, cp, tname, sizeof tname);
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if (n < 0)
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return (-1);
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cp += n;
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if (cp + 2 * INT16SZ > eom1)
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return (-1);
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ttype = ns_get16(cp); cp += INT16SZ;
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tclass = ns_get16(cp); cp += INT16SZ;
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if (!res_nameinquery(tname, ttype, tclass, buf2, eom2))
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return (0);
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}
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return (1);
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}
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libresolv_hidden_def (res_queriesmatch)
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int
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__libc_res_nsend(res_state statp, const u_char *buf, int buflen,
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u_char *ans, int anssiz, u_char **ansp)
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{
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int gotsomewhere, terrno, try, v_circuit, resplen, ns, n;
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if (statp->nscount == 0) {
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__set_errno (ESRCH);
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return (-1);
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}
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if (anssiz < HFIXEDSZ) {
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__set_errno (EINVAL);
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return (-1);
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}
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if ((statp->qhook || statp->rhook) && anssiz < MAXPACKET && ansp) {
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u_char *buf = malloc (MAXPACKET);
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if (buf == NULL)
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return (-1);
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memcpy (buf, ans, HFIXEDSZ);
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*ansp = buf;
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ans = buf;
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anssiz = MAXPACKET;
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}
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DprintQ((statp->options & RES_DEBUG) || (statp->pfcode & RES_PRF_QUERY),
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(stdout, ";; res_send()\n"), buf, buflen);
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v_circuit = (statp->options & RES_USEVC) || buflen > PACKETSZ;
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gotsomewhere = 0;
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terrno = ETIMEDOUT;
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/*
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* If the ns_addr_list in the resolver context has changed, then
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* invalidate our cached copy and the associated timing data.
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*/
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if (EXT(statp).nsinit) {
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int needclose = 0;
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if (EXT(statp).nscount != statp->nscount)
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needclose++;
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else
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for (ns = 0; ns < MAXNS; ns++) {
|
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unsigned int map = EXT(statp).nsmap[ns];
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if (map < MAXNS
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&& !sock_eq((struct sockaddr_in6 *)
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&statp->nsaddr_list[map],
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EXT(statp).nsaddrs[ns]))
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{
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needclose++;
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break;
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}
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}
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if (needclose)
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res_nclose(statp);
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}
|
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|
|
/*
|
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* Maybe initialize our private copy of the ns_addr_list.
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*/
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if (EXT(statp).nsinit == 0) {
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unsigned char map[MAXNS];
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|
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memset (map, MAXNS, sizeof (map));
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for (n = 0; n < MAXNS; n++) {
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ns = EXT(statp).nsmap[n];
|
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if (ns < statp->nscount)
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map[ns] = n;
|
|
else if (ns < MAXNS) {
|
|
free(EXT(statp).nsaddrs[n]);
|
|
EXT(statp).nsaddrs[n] = NULL;
|
|
EXT(statp).nsmap[n] = MAXNS;
|
|
}
|
|
}
|
|
n = statp->nscount;
|
|
if (statp->nscount > EXT(statp).nscount)
|
|
for (n = EXT(statp).nscount, ns = 0;
|
|
n < statp->nscount; n++) {
|
|
while (ns < MAXNS
|
|
&& EXT(statp).nsmap[ns] != MAXNS)
|
|
ns++;
|
|
if (ns == MAXNS)
|
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break;
|
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EXT(statp).nsmap[ns] = n;
|
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map[n] = ns++;
|
|
}
|
|
EXT(statp).nscount = n;
|
|
for (ns = 0; ns < EXT(statp).nscount; ns++) {
|
|
n = map[ns];
|
|
if (EXT(statp).nsaddrs[n] == NULL)
|
|
EXT(statp).nsaddrs[n] =
|
|
malloc(sizeof (struct sockaddr_in6));
|
|
if (EXT(statp).nsaddrs[n] != NULL) {
|
|
memcpy(EXT(statp).nsaddrs[n],
|
|
&statp->nsaddr_list[ns],
|
|
sizeof (struct sockaddr_in));
|
|
EXT(statp).nssocks[n] = -1;
|
|
n++;
|
|
}
|
|
}
|
|
EXT(statp).nsinit = 1;
|
|
}
|
|
|
|
/*
|
|
* Some resolvers want to even out the load on their nameservers.
|
|
* Note that RES_BLAST overrides RES_ROTATE.
|
|
*/
|
|
if ((statp->options & RES_ROTATE) != 0 &&
|
|
(statp->options & RES_BLAST) == 0) {
|
|
struct sockaddr_in6 *ina;
|
|
unsigned int map;
|
|
|
|
n = 0;
|
|
while (n < MAXNS && EXT(statp).nsmap[n] == MAXNS)
|
|
n++;
|
|
if (n < MAXNS) {
|
|
ina = EXT(statp).nsaddrs[n];
|
|
map = EXT(statp).nsmap[n];
|
|
for (;;) {
|
|
ns = n + 1;
|
|
while (ns < MAXNS
|
|
&& EXT(statp).nsmap[ns] == MAXNS)
|
|
ns++;
|
|
if (ns == MAXNS)
|
|
break;
|
|
EXT(statp).nsaddrs[n] = EXT(statp).nsaddrs[ns];
|
|
EXT(statp).nsmap[n] = EXT(statp).nsmap[ns];
|
|
n = ns;
|
|
}
|
|
EXT(statp).nsaddrs[n] = ina;
|
|
EXT(statp).nsmap[n] = map;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Send request, RETRY times, or until successful.
|
|
*/
|
|
for (try = 0; try < statp->retry; try++) {
|
|
for (ns = 0; ns < MAXNS; ns++)
|
|
{
|
|
struct sockaddr_in6 *nsap = EXT(statp).nsaddrs[ns];
|
|
|
|
if (nsap == NULL)
|
|
goto next_ns;
|
|
same_ns:
|
|
if (statp->qhook) {
|
|
int done = 0, loops = 0;
|
|
|
|
do {
|
|
res_sendhookact act;
|
|
|
|
struct sockaddr_in *nsap4;
|
|
nsap4 = (struct sockaddr_in *) nsap;
|
|
act = (*statp->qhook)(&nsap4, &buf, &buflen,
|
|
ans, anssiz, &resplen);
|
|
nsap = (struct sockaddr_in6 *) nsap4;
|
|
switch (act) {
|
|
case res_goahead:
|
|
done = 1;
|
|
break;
|
|
case res_nextns:
|
|
res_nclose(statp);
|
|
goto next_ns;
|
|
case res_done:
|
|
return (resplen);
|
|
case res_modified:
|
|
/* give the hook another try */
|
|
if (++loops < 42) /*doug adams*/
|
|
break;
|
|
/*FALLTHROUGH*/
|
|
case res_error:
|
|
/*FALLTHROUGH*/
|
|
default:
|
|
return (-1);
|
|
}
|
|
} while (!done);
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
char tmpbuf[40];
|
|
#endif
|
|
Dprint(statp->options & RES_DEBUG,
|
|
(stdout, ";; Querying server (# %d) address = %s\n",
|
|
ns + 1, inet_ntop(AF_INET6, &nsap->sin6_addr,
|
|
tmpbuf, sizeof (tmpbuf))));
|
|
|
|
if (v_circuit) {
|
|
/* Use VC; at most one attempt per server. */
|
|
try = statp->retry;
|
|
n = send_vc(statp, buf, buflen, &ans, &anssiz, &terrno,
|
|
ns, ansp);
|
|
if (n < 0)
|
|
return (-1);
|
|
if (n == 0)
|
|
goto next_ns;
|
|
resplen = n;
|
|
} else {
|
|
/* Use datagrams. */
|
|
n = send_dg(statp, buf, buflen, &ans, &anssiz, &terrno,
|
|
ns, &v_circuit, &gotsomewhere, ansp);
|
|
if (n < 0)
|
|
return (-1);
|
|
if (n == 0)
|
|
goto next_ns;
|
|
if (v_circuit)
|
|
goto same_ns;
|
|
resplen = n;
|
|
}
|
|
|
|
Dprint((statp->options & RES_DEBUG) ||
|
|
((statp->pfcode & RES_PRF_REPLY) &&
|
|
(statp->pfcode & RES_PRF_HEAD1)),
|
|
(stdout, ";; got answer:\n"));
|
|
|
|
DprintQ((statp->options & RES_DEBUG) ||
|
|
(statp->pfcode & RES_PRF_REPLY),
|
|
(stdout, "%s", ""),
|
|
ans, (resplen > anssiz) ? anssiz : resplen);
|
|
|
|
/*
|
|
* If we have temporarily opened a virtual circuit,
|
|
* or if we haven't been asked to keep a socket open,
|
|
* close the socket.
|
|
*/
|
|
if ((v_circuit && (statp->options & RES_USEVC) == 0) ||
|
|
(statp->options & RES_STAYOPEN) == 0) {
|
|
res_nclose(statp);
|
|
}
|
|
if (statp->rhook) {
|
|
int done = 0, loops = 0;
|
|
|
|
do {
|
|
res_sendhookact act;
|
|
|
|
act = (*statp->rhook)((struct sockaddr_in *)
|
|
nsap, buf, buflen,
|
|
ans, anssiz, &resplen);
|
|
switch (act) {
|
|
case res_goahead:
|
|
case res_done:
|
|
done = 1;
|
|
break;
|
|
case res_nextns:
|
|
res_nclose(statp);
|
|
goto next_ns;
|
|
case res_modified:
|
|
/* give the hook another try */
|
|
if (++loops < 42) /*doug adams*/
|
|
break;
|
|
/*FALLTHROUGH*/
|
|
case res_error:
|
|
/*FALLTHROUGH*/
|
|
default:
|
|
return (-1);
|
|
}
|
|
} while (!done);
|
|
|
|
}
|
|
return (resplen);
|
|
next_ns: ;
|
|
} /*foreach ns*/
|
|
} /*foreach retry*/
|
|
res_nclose(statp);
|
|
if (!v_circuit) {
|
|
if (!gotsomewhere)
|
|
__set_errno (ECONNREFUSED); /* no nameservers found */
|
|
else
|
|
__set_errno (ETIMEDOUT); /* no answer obtained */
|
|
} else
|
|
__set_errno (terrno);
|
|
return (-1);
|
|
}
|
|
|
|
int
|
|
res_nsend(res_state statp,
|
|
const u_char *buf, int buflen, u_char *ans, int anssiz)
|
|
{
|
|
return __libc_res_nsend(statp, buf, buflen, ans, anssiz, NULL);
|
|
}
|
|
libresolv_hidden_def (res_nsend)
|
|
|
|
/* Private */
|
|
|
|
static int
|
|
send_vc(res_state statp,
|
|
const u_char *buf, int buflen, u_char **ansp, int *anssizp,
|
|
int *terrno, int ns, u_char **anscp)
|
|
{
|
|
const HEADER *hp = (HEADER *) buf;
|
|
u_char *ans = *ansp;
|
|
int anssiz = *anssizp;
|
|
HEADER *anhp = (HEADER *) ans;
|
|
struct sockaddr_in6 *nsap = EXT(statp).nsaddrs[ns];
|
|
int truncating, connreset, resplen, n;
|
|
struct iovec iov[2];
|
|
u_short len;
|
|
u_char *cp;
|
|
|
|
connreset = 0;
|
|
same_ns:
|
|
truncating = 0;
|
|
|
|
/* Are we still talking to whom we want to talk to? */
|
|
if (statp->_vcsock >= 0 && (statp->_flags & RES_F_VC) != 0) {
|
|
struct sockaddr_in6 peer;
|
|
int size = sizeof peer;
|
|
|
|
if (getpeername(statp->_vcsock,
|
|
(struct sockaddr *)&peer, &size) < 0 ||
|
|
!sock_eq(&peer, nsap)) {
|
|
res_nclose(statp);
|
|
statp->_flags &= ~RES_F_VC;
|
|
}
|
|
}
|
|
|
|
if (statp->_vcsock < 0 || (statp->_flags & RES_F_VC) == 0) {
|
|
if (statp->_vcsock >= 0)
|
|
res_nclose(statp);
|
|
|
|
statp->_vcsock = socket(nsap->sin6_family, SOCK_STREAM, 0);
|
|
if (statp->_vcsock < 0) {
|
|
*terrno = errno;
|
|
Perror(statp, stderr, "socket(vc)", errno);
|
|
return (-1);
|
|
}
|
|
__set_errno (0);
|
|
if (connect(statp->_vcsock, (struct sockaddr *)nsap,
|
|
sizeof *nsap) < 0) {
|
|
*terrno = errno;
|
|
Aerror(statp, stderr, "connect/vc", errno,
|
|
(struct sockaddr *) nsap);
|
|
res_nclose(statp);
|
|
return (0);
|
|
}
|
|
statp->_flags |= RES_F_VC;
|
|
}
|
|
|
|
/*
|
|
* Send length & message
|
|
*/
|
|
putshort((u_short)buflen, (u_char*)&len);
|
|
evConsIovec(&len, INT16SZ, &iov[0]);
|
|
evConsIovec((void*)buf, buflen, &iov[1]);
|
|
if (TEMP_FAILURE_RETRY (writev(statp->_vcsock, iov, 2))
|
|
!= (INT16SZ + buflen)) {
|
|
*terrno = errno;
|
|
Perror(statp, stderr, "write failed", errno);
|
|
res_nclose(statp);
|
|
return (0);
|
|
}
|
|
/*
|
|
* Receive length & response
|
|
*/
|
|
read_len:
|
|
cp = ans;
|
|
len = INT16SZ;
|
|
while ((n = TEMP_FAILURE_RETRY (read(statp->_vcsock, (char *)cp,
|
|
(int)len))) > 0) {
|
|
cp += n;
|
|
if ((len -= n) <= 0)
|
|
break;
|
|
}
|
|
if (n <= 0) {
|
|
*terrno = errno;
|
|
Perror(statp, stderr, "read failed", errno);
|
|
res_nclose(statp);
|
|
/*
|
|
* A long running process might get its TCP
|
|
* connection reset if the remote server was
|
|
* restarted. Requery the server instead of
|
|
* trying a new one. When there is only one
|
|
* server, this means that a query might work
|
|
* instead of failing. We only allow one reset
|
|
* per query to prevent looping.
|
|
*/
|
|
if (*terrno == ECONNRESET && !connreset) {
|
|
connreset = 1;
|
|
res_nclose(statp);
|
|
goto same_ns;
|
|
}
|
|
res_nclose(statp);
|
|
return (0);
|
|
}
|
|
resplen = ns_get16(ans);
|
|
if (resplen > anssiz) {
|
|
if (anscp) {
|
|
ans = malloc (MAXPACKET);
|
|
if (ans == NULL) {
|
|
*terrno = ENOMEM;
|
|
res_nclose(statp);
|
|
return (0);
|
|
}
|
|
anssiz = MAXPACKET;
|
|
*anssizp = MAXPACKET;
|
|
*ansp = ans;
|
|
*anscp = ans;
|
|
anhp = (HEADER *) ans;
|
|
len = resplen;
|
|
} else {
|
|
Dprint(statp->options & RES_DEBUG,
|
|
(stdout, ";; response truncated\n")
|
|
);
|
|
truncating = 1;
|
|
len = anssiz;
|
|
}
|
|
} else
|
|
len = resplen;
|
|
if (len < HFIXEDSZ) {
|
|
/*
|
|
* Undersized message.
|
|
*/
|
|
Dprint(statp->options & RES_DEBUG,
|
|
(stdout, ";; undersized: %d\n", len));
|
|
*terrno = EMSGSIZE;
|
|
res_nclose(statp);
|
|
return (0);
|
|
}
|
|
cp = ans;
|
|
while (len != 0 && (n = read(statp->_vcsock, (char *)cp, (int)len)) > 0){
|
|
cp += n;
|
|
len -= n;
|
|
}
|
|
if (n <= 0) {
|
|
*terrno = errno;
|
|
Perror(statp, stderr, "read(vc)", errno);
|
|
res_nclose(statp);
|
|
return (0);
|
|
}
|
|
if (truncating) {
|
|
/*
|
|
* Flush rest of answer so connection stays in synch.
|
|
*/
|
|
anhp->tc = 1;
|
|
len = resplen - anssiz;
|
|
while (len != 0) {
|
|
char junk[PACKETSZ];
|
|
|
|
n = read(statp->_vcsock, junk,
|
|
(len > sizeof junk) ? sizeof junk : len);
|
|
if (n > 0)
|
|
len -= n;
|
|
else
|
|
break;
|
|
}
|
|
}
|
|
/*
|
|
* If the calling applicating has bailed out of
|
|
* a previous call and failed to arrange to have
|
|
* the circuit closed or the server has got
|
|
* itself confused, then drop the packet and
|
|
* wait for the correct one.
|
|
*/
|
|
if (hp->id != anhp->id) {
|
|
DprintQ((statp->options & RES_DEBUG) ||
|
|
(statp->pfcode & RES_PRF_REPLY),
|
|
(stdout, ";; old answer (unexpected):\n"),
|
|
ans, (resplen > anssiz) ? anssiz: resplen);
|
|
goto read_len;
|
|
}
|
|
|
|
/*
|
|
* All is well, or the error is fatal. Signal that the
|
|
* next nameserver ought not be tried.
|
|
*/
|
|
return (resplen);
|
|
}
|
|
|
|
static int
|
|
send_dg(res_state statp,
|
|
const u_char *buf, int buflen, u_char **ansp, int *anssizp,
|
|
int *terrno, int ns, int *v_circuit, int *gotsomewhere, u_char **anscp)
|
|
{
|
|
const HEADER *hp = (HEADER *) buf;
|
|
u_char *ans = *ansp;
|
|
int anssiz = *anssizp;
|
|
HEADER *anhp = (HEADER *) ans;
|
|
struct sockaddr_in6 *nsap = EXT(statp).nsaddrs[ns];
|
|
struct timespec now, timeout, finish;
|
|
struct pollfd pfd[1];
|
|
int ptimeout;
|
|
struct sockaddr_in6 from;
|
|
static int socket_pf = 0;
|
|
int fromlen, resplen, seconds, n;
|
|
|
|
if (EXT(statp).nssocks[ns] == -1) {
|
|
/* only try IPv6 if IPv6 NS and if not failed before */
|
|
if ((EXT(statp).nscount6 > 0) && (socket_pf != PF_INET)) {
|
|
EXT(statp).nssocks[ns] =
|
|
socket(PF_INET6, SOCK_DGRAM, 0);
|
|
socket_pf = EXT(statp).nssocks[ns] < 0 ? PF_INET
|
|
: PF_INET6;
|
|
}
|
|
if (EXT(statp).nssocks[ns] < 0)
|
|
EXT(statp).nssocks[ns] = socket(PF_INET, SOCK_DGRAM, 0);
|
|
if (EXT(statp).nssocks[ns] < 0) {
|
|
*terrno = errno;
|
|
Perror(statp, stderr, "socket(dg)", errno);
|
|
return (-1);
|
|
}
|
|
/* If IPv6 socket and nsap is IPv4, make it IPv4-mapped */
|
|
if ((socket_pf == PF_INET6) && (nsap->sin6_family == AF_INET))
|
|
convaddr4to6(nsap);
|
|
/*
|
|
* On a 4.3BSD+ machine (client and server,
|
|
* actually), sending to a nameserver datagram
|
|
* port with no nameserver will cause an
|
|
* ICMP port unreachable message to be returned.
|
|
* If our datagram socket is "connected" to the
|
|
* server, we get an ECONNREFUSED error on the next
|
|
* socket operation, and select returns if the
|
|
* error message is received. We can thus detect
|
|
* the absence of a nameserver without timing out.
|
|
*/
|
|
if (connect(EXT(statp).nssocks[ns], (struct sockaddr *)nsap,
|
|
sizeof *nsap) < 0) {
|
|
Aerror(statp, stderr, "connect(dg)", errno,
|
|
(struct sockaddr *) nsap);
|
|
res_nclose(statp);
|
|
return (0);
|
|
}
|
|
/* Make socket non-blocking. */
|
|
int fl = fcntl (EXT(statp).nssocks[ns], F_GETFL);
|
|
if (fl != -1)
|
|
fcntl (EXT(statp).nssocks[ns], F_SETFL,
|
|
fl | O_NONBLOCK);
|
|
Dprint(statp->options & RES_DEBUG,
|
|
(stdout, ";; new DG socket\n"))
|
|
}
|
|
|
|
/*
|
|
* Compute time for the total operation.
|
|
*/
|
|
seconds = (statp->retrans << ns);
|
|
if (ns > 0)
|
|
seconds /= statp->nscount;
|
|
if (seconds <= 0)
|
|
seconds = 1;
|
|
evNowTime(&now);
|
|
evConsTime(&timeout, seconds, 0);
|
|
evAddTime(&finish, &now, &timeout);
|
|
int need_recompute = 0;
|
|
int nwritten = 0;
|
|
pfd[0].fd = EXT(statp).nssocks[ns];
|
|
pfd[0].events = POLLOUT;
|
|
wait:
|
|
if (need_recompute) {
|
|
evNowTime(&now);
|
|
if (evCmpTime(finish, now) <= 0) {
|
|
Perror(statp, stderr, "select", errno);
|
|
res_nclose(statp);
|
|
return (0);
|
|
}
|
|
evSubTime(&timeout, &finish, &now);
|
|
}
|
|
/* Convert struct timespec in milliseconds. */
|
|
ptimeout = timeout.tv_sec * 1000 + timeout.tv_nsec / 1000000;
|
|
|
|
n = 0;
|
|
if (nwritten == 0)
|
|
n = poll (pfd, 1, 0);
|
|
if (__builtin_expect (n == 0, 0)) {
|
|
n = poll (pfd, 1, ptimeout);
|
|
need_recompute = 1;
|
|
}
|
|
if (n == 0) {
|
|
Dprint(statp->options & RES_DEBUG, (stdout,
|
|
";; timeout sending\n"));
|
|
*gotsomewhere = 1;
|
|
return (0);
|
|
}
|
|
if (n < 0) {
|
|
if (errno == EINTR) {
|
|
recompute_resend:
|
|
evNowTime(&now);
|
|
if (evCmpTime(finish, now) > 0) {
|
|
evSubTime(&timeout, &finish, &now);
|
|
goto wait;
|
|
}
|
|
}
|
|
Perror(statp, stderr, "poll", errno);
|
|
res_nclose(statp);
|
|
return (0);
|
|
}
|
|
__set_errno (0);
|
|
if (pfd[0].revents & POLLOUT) {
|
|
if (send(pfd[0].fd, (char*)buf, buflen, 0) != buflen) {
|
|
if (errno == EINTR || errno == EAGAIN)
|
|
goto recompute_resend;
|
|
Perror(statp, stderr, "send", errno);
|
|
res_nclose(statp);
|
|
return (0);
|
|
}
|
|
pfd[0].events = POLLIN;
|
|
++nwritten;
|
|
goto wait;
|
|
} else if (pfd[0].revents & POLLIN) {
|
|
fromlen = sizeof(struct sockaddr_in6);
|
|
if (anssiz < MAXPACKET
|
|
&& anscp
|
|
&& (ioctl (pfd[0].fd, FIONREAD, &resplen) < 0
|
|
|| anssiz < resplen)) {
|
|
ans = malloc (MAXPACKET);
|
|
if (ans == NULL)
|
|
ans = *ansp;
|
|
else {
|
|
anssiz = MAXPACKET;
|
|
*anssizp = MAXPACKET;
|
|
*ansp = ans;
|
|
*anscp = ans;
|
|
anhp = (HEADER *) ans;
|
|
}
|
|
}
|
|
resplen = recvfrom(pfd[0].fd, (char*)ans, anssiz,0,
|
|
(struct sockaddr *)&from, &fromlen);
|
|
if (resplen <= 0) {
|
|
if (errno == EINTR || errno == EAGAIN) {
|
|
need_recompute = 1;
|
|
goto wait;
|
|
}
|
|
Perror(statp, stderr, "recvfrom", errno);
|
|
res_nclose(statp);
|
|
return (0);
|
|
}
|
|
*gotsomewhere = 1;
|
|
if (resplen < HFIXEDSZ) {
|
|
/*
|
|
* Undersized message.
|
|
*/
|
|
Dprint(statp->options & RES_DEBUG,
|
|
(stdout, ";; undersized: %d\n",
|
|
resplen));
|
|
*terrno = EMSGSIZE;
|
|
res_nclose(statp);
|
|
return (0);
|
|
}
|
|
if (hp->id != anhp->id) {
|
|
/*
|
|
* response from old query, ignore it.
|
|
* XXX - potential security hazard could
|
|
* be detected here.
|
|
*/
|
|
DprintQ((statp->options & RES_DEBUG) ||
|
|
(statp->pfcode & RES_PRF_REPLY),
|
|
(stdout, ";; old answer:\n"),
|
|
ans, (resplen > anssiz) ? anssiz : resplen);
|
|
goto wait;
|
|
}
|
|
if (!(statp->options & RES_INSECURE1) &&
|
|
!res_ourserver_p(statp, &from)) {
|
|
/*
|
|
* response from wrong server? ignore it.
|
|
* XXX - potential security hazard could
|
|
* be detected here.
|
|
*/
|
|
DprintQ((statp->options & RES_DEBUG) ||
|
|
(statp->pfcode & RES_PRF_REPLY),
|
|
(stdout, ";; not our server:\n"),
|
|
ans, (resplen > anssiz) ? anssiz : resplen);
|
|
goto wait;
|
|
}
|
|
if (!(statp->options & RES_INSECURE2) &&
|
|
!res_queriesmatch(buf, buf + buflen,
|
|
ans, ans + anssiz)) {
|
|
/*
|
|
* response contains wrong query? ignore it.
|
|
* XXX - potential security hazard could
|
|
* be detected here.
|
|
*/
|
|
DprintQ((statp->options & RES_DEBUG) ||
|
|
(statp->pfcode & RES_PRF_REPLY),
|
|
(stdout, ";; wrong query name:\n"),
|
|
ans, (resplen > anssiz) ? anssiz : resplen);
|
|
goto wait;
|
|
}
|
|
if (anhp->rcode == SERVFAIL ||
|
|
anhp->rcode == NOTIMP ||
|
|
anhp->rcode == REFUSED) {
|
|
DprintQ(statp->options & RES_DEBUG,
|
|
(stdout, "server rejected query:\n"),
|
|
ans, (resplen > anssiz) ? anssiz : resplen);
|
|
res_nclose(statp);
|
|
/* don't retry if called from dig */
|
|
if (!statp->pfcode)
|
|
return (0);
|
|
}
|
|
if (!(statp->options & RES_IGNTC) && anhp->tc) {
|
|
/*
|
|
* To get the rest of answer,
|
|
* use TCP with same server.
|
|
*/
|
|
Dprint(statp->options & RES_DEBUG,
|
|
(stdout, ";; truncated answer\n"));
|
|
*v_circuit = 1;
|
|
res_nclose(statp);
|
|
return (1);
|
|
}
|
|
/*
|
|
* All is well, or the error is fatal. Signal that the
|
|
* next nameserver ought not be tried.
|
|
*/
|
|
return (resplen);
|
|
} else if (pfd[0].revents & (POLLERR | POLLHUP | POLLNVAL)) {
|
|
/* Something went wrong. We can stop trying. */
|
|
res_nclose(statp);
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
static void
|
|
Aerror(const res_state statp, FILE *file, const char *string, int error,
|
|
const struct sockaddr *address)
|
|
{
|
|
int save = errno;
|
|
|
|
if ((statp->options & RES_DEBUG) != 0) {
|
|
char tmp[sizeof "xxxx.xxxx.xxxx.255.255.255.255"];
|
|
|
|
fprintf(file, "res_send: %s ([%s].%u): %s\n",
|
|
string,
|
|
inet_ntop(address->sa_family, address->sa_data,
|
|
tmp, sizeof tmp),
|
|
(address->sa_family == AF_INET
|
|
? ntohs(((struct sockaddr_in *) address)->sin_port)
|
|
: address->sa_family == AF_INET6
|
|
? ntohs(((struct sockaddr_in6 *) address)->sin6_port)
|
|
: 0),
|
|
strerror(error));
|
|
}
|
|
__set_errno (save);
|
|
}
|
|
|
|
static void
|
|
Perror(const res_state statp, FILE *file, const char *string, int error) {
|
|
int save = errno;
|
|
|
|
if ((statp->options & RES_DEBUG) != 0)
|
|
fprintf(file, "res_send: %s: %s\n",
|
|
string, strerror(error));
|
|
__set_errno (save);
|
|
}
|
|
#endif
|
|
|
|
static int
|
|
sock_eq(struct sockaddr_in6 *a1, struct sockaddr_in6 *a2) {
|
|
if (a1->sin6_family == a2->sin6_family) {
|
|
if (a1->sin6_family == AF_INET)
|
|
return ((((struct sockaddr_in *)a1)->sin_port ==
|
|
((struct sockaddr_in *)a2)->sin_port) &&
|
|
(((struct sockaddr_in *)a1)->sin_addr.s_addr ==
|
|
((struct sockaddr_in *)a2)->sin_addr.s_addr));
|
|
else
|
|
return ((a1->sin6_port == a2->sin6_port) &&
|
|
!memcmp(&a1->sin6_addr, &a2->sin6_addr,
|
|
sizeof (struct in6_addr)));
|
|
}
|
|
if (a1->sin6_family == AF_INET) {
|
|
struct sockaddr_in6 *sap = a1;
|
|
a1 = a2;
|
|
a2 = sap;
|
|
} /* assumes that AF_INET and AF_INET6 are the only possibilities */
|
|
return ((a1->sin6_port == ((struct sockaddr_in *)a2)->sin_port) &&
|
|
IN6_IS_ADDR_V4MAPPED(&a1->sin6_addr) &&
|
|
(a1->sin6_addr.s6_addr32[3] ==
|
|
((struct sockaddr_in *)a2)->sin_addr.s_addr));
|
|
}
|
|
|
|
/*
|
|
* Converts IPv4 family, address and port to
|
|
* IPv6 family, IPv4-mapped IPv6 address and port.
|
|
*/
|
|
static void
|
|
convaddr4to6(struct sockaddr_in6 *sa)
|
|
{
|
|
struct sockaddr_in *sa4p = (struct sockaddr_in *) sa;
|
|
in_port_t port = sa4p->sin_port;
|
|
in_addr_t addr = sa4p->sin_addr.s_addr;
|
|
|
|
sa->sin6_family = AF_INET6;
|
|
sa->sin6_port = port;
|
|
sa->sin6_addr.s6_addr32[0] = 0;
|
|
sa->sin6_addr.s6_addr32[1] = 0;
|
|
sa->sin6_addr.s6_addr32[2] = htonl(0xFFFF);
|
|
sa->sin6_addr.s6_addr32[3] = addr;
|
|
}
|