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-rw-r--r--contrib/bind/tools/nslookup/send.c411
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diff --git a/contrib/bind/tools/nslookup/send.c b/contrib/bind/tools/nslookup/send.c
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--- a/contrib/bind/tools/nslookup/send.c
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-/*
- * ++Copyright++ 1985, 1989
- * -
- * Copyright (c) 1985, 1989
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * -
- * Portions Copyright (c) 1993 by Digital Equipment Corporation.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies, and that
- * the name of Digital Equipment Corporation not be used in advertising or
- * publicity pertaining to distribution of the document or software without
- * specific, written prior permission.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
- * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
- * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
- * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
- * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
- * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
- * SOFTWARE.
- * -
- * --Copyright--
- */
-
-#ifndef lint
-static char sccsid[] = "@(#)send.c 5.18 (Berkeley) 3/2/91";
-static char rcsid[] = "$Id: send.c,v 8.2 1997/06/01 20:34:40 vixie Exp $";
-#endif /* not lint */
-
-/*
- ******************************************************************************
- *
- * send.c --
- *
- * Routine to send request packets to a name server.
- *
- * Based on "@(#)res_send.c 6.25 (Berkeley) 6/1/90".
- *
- ******************************************************************************
- */
-
-
-/*
- * Send query to name server and wait for reply.
- */
-
-#include <sys/param.h>
-#include <sys/time.h>
-#include <sys/socket.h>
-#include <sys/uio.h>
-#include <netinet/in.h>
-#include <stdio.h>
-#include <errno.h>
-#include <arpa/nameser.h>
-#include <arpa/inet.h>
-#include <resolv.h>
-#include "res.h"
-#include "../../conf/portability.h"
-
-static int s = -1; /* socket used for communications */
-
-
-#ifndef FD_SET
-#define NFDBITS 32
-#define FD_SETSIZE 32
-#define FD_SET(n, p) ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS)))
-#define FD_CLR(n, p) ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS)))
-#define FD_ISSET(n, p) ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS)))
-#define FD_ZERO(p) bzero((char *)(p), sizeof(*(p)))
-#endif
-
-
-
-unsigned short nsport = NAMESERVER_PORT;
-
-
-
-/*
- ******************************************************************************
- *
- * SendRequest --
- *
- * Sends a request packet to a name server whose address
- * is specified by the first argument and returns with
- * the answer packet.
- *
- * Results:
- * SUCCESS - the request was sent and an answer
- * was received.
- * TIME_OUT - the virtual circuit connection timed-out
- * or a reply to a datagram wasn't received.
- *
- *
- ******************************************************************************
- */
-
-int
-SendRequest(nsAddrPtr, buf, buflen, answer, anslen, trueLenPtr)
- struct in_addr *nsAddrPtr;
- char *buf;
- int buflen;
- char *answer;
- u_int anslen;
- int *trueLenPtr;
-{
- register int n;
- int try, v_circuit, resplen;
- int gotsomewhere = 0, connected = 0;
- int connreset = 0;
- u_short id, len;
- char *cp;
- fd_set dsmask;
- struct timeval timeout;
- HEADER *hp = (HEADER *) buf;
- HEADER *anhp = (HEADER *) answer;
- struct iovec iov[2];
- int terrno = ETIMEDOUT;
- char junk[512];
- struct sockaddr_in sin;
-
- if (_res.options & RES_DEBUG2) {
- printf("------------\nSendRequest(), len %d\n", buflen);
- Print_query(buf, buf+buflen, 1);
- }
- sin.sin_family = AF_INET;
- sin.sin_port = htons(nsport);
- sin.sin_addr = *nsAddrPtr;
- v_circuit = (_res.options & RES_USEVC) || buflen > PACKETSZ;
- id = hp->id;
- /*
- * Send request, RETRY times, or until successful
- */
- for (try = 0; try < _res.retry; try++) {
- usevc:
- if (v_circuit) {
- int truncated = 0;
-
- /*
- * Use virtual circuit;
- * at most one attempt per server.
- */
- try = _res.retry;
- if (s < 0) {
- s = socket(AF_INET, SOCK_STREAM, 0);
- if (s < 0) {
- terrno = errno;
- if (_res.options & RES_DEBUG)
- perror("socket (vc) failed");
- continue;
- }
- if (connect(s, (struct sockaddr *)&sin,
- sizeof(struct sockaddr)) < 0) {
- terrno = errno;
- if (_res.options & RES_DEBUG)
- perror("connect failed");
- (void) close(s);
- s = -1;
- continue;
- }
- }
- /*
- * Send length & message
- */
- __putshort(buflen, (u_char *)&len);
- iov[0].iov_base = (caddr_t)&len;
- iov[0].iov_len = INT16SZ;
- iov[1].iov_base = buf;
- iov[1].iov_len = buflen;
- if (writev(s, iov, 2) != INT16SZ + buflen) {
- terrno = errno;
- if (_res.options & RES_DEBUG)
- perror("write failed");
- (void) close(s);
- s = -1;
- continue;
- }
- /*
- * Receive length & response
- */
- cp = answer;
- len = INT16SZ;
- while ((n = read(s, (char *)cp, (int)len)) > 0) {
- cp += n;
- if ((len -= n) <= 0)
- break;
- }
- if (n <= 0) {
- terrno = errno;
- if (_res.options & RES_DEBUG)
- perror("read failed");
- (void) close(s);
- s = -1;
- /*
- * 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;
- }
- continue;
- }
- cp = answer;
- if ((resplen = _getshort((u_char*)cp)) > anslen) {
- if (_res.options & RES_DEBUG)
- fprintf(stderr, "response truncated\n");
- len = anslen;
- truncated = 1;
- } else
- len = resplen;
- while (len != 0 &&
- (n = read(s, (char *)cp, (int)len)) > 0) {
- cp += n;
- len -= n;
- }
- if (n <= 0) {
- terrno = errno;
- if (_res.options & RES_DEBUG)
- perror("read failed");
- (void) close(s);
- s = -1;
- continue;
- }
- if (truncated) {
- /*
- * Flush rest of answer
- * so connection stays in synch.
- */
- anhp->tc = 1;
- len = resplen - anslen;
- while (len != 0) {
- n = (len > sizeof(junk) ?
- sizeof(junk) : len);
- if ((n = read(s, junk, n)) > 0)
- len -= n;
- else
- break;
- }
- }
- } else {
- /*
- * Use datagrams.
- */
- if (s < 0) {
- s = socket(AF_INET, SOCK_DGRAM, 0);
- if (s < 0) {
- terrno = errno;
- if (_res.options & RES_DEBUG)
- perror("socket (dg) failed");
- continue;
- }
- }
-#if BSD >= 43
- if (connected == 0) {
- if (connect(s, (struct sockaddr *)&sin,
- sizeof(struct sockaddr)) < 0) {
- if (_res.options & RES_DEBUG)
- perror("connect");
- continue;
- }
- connected = 1;
- }
- if (send(s, buf, buflen, 0) != buflen) {
- if (_res.options & RES_DEBUG)
- perror("send");
- continue;
- }
-#else /* BSD */
- if (sendto(s, buf, buflen, 0,
- (struct sockaddr *) &sin,
- sizeof(sin)) != buflen) {
- if (_res.options & RES_DEBUG)
- perror("sendto");
- continue;
- }
-#endif
-
- /*
- * Wait for reply
- */
- timeout.tv_sec = (_res.retrans << try);
- if (timeout.tv_sec <= 0)
- timeout.tv_sec = 1;
- timeout.tv_usec = 0;
-wait:
- FD_ZERO(&dsmask);
- FD_SET(s, &dsmask);
- n = select(s+1, &dsmask, (fd_set *)NULL,
- (fd_set *)NULL, &timeout);
- if (n < 0) {
- if (_res.options & RES_DEBUG)
- perror("select");
- continue;
- }
- if (n == 0) {
- /*
- * timeout
- */
- if (_res.options & RES_DEBUG)
- printf("timeout\n");
-#if BSD >= 43
- gotsomewhere = 1;
-#endif
- continue;
- }
- if ((resplen = recv(s, answer, anslen, 0)) <= 0) {
- if (_res.options & RES_DEBUG)
- perror("recvfrom");
- continue;
- }
- gotsomewhere = 1;
- if (id != anhp->id) {
- /*
- * response from old query, ignore it
- */
- if (_res.options & RES_DEBUG2) {
- printf("------------\nOld answer:\n");
- Print_query(answer, answer+resplen, 1);
- }
- goto wait;
- }
- if (!(_res.options & RES_IGNTC) && anhp->tc) {
- /*
- * get rest of answer;
- * use TCP with same server.
- */
- if (_res.options & RES_DEBUG)
- printf("truncated answer\n");
- (void) close(s);
- s = -1;
- v_circuit = 1;
- goto usevc;
- }
- }
- if (_res.options & RES_DEBUG) {
- if (_res.options & RES_DEBUG2)
- printf("------------\nGot answer (%d bytes):\n",
- resplen);
- else
- printf("------------\nGot answer:\n");
- Print_query(answer, answer+resplen, 1);
- }
- (void) close(s);
- s = -1;
- *trueLenPtr = resplen;
- return (SUCCESS);
- }
- if (s >= 0) {
- (void) close(s);
- s = -1;
- }
- if (v_circuit == 0)
- if (gotsomewhere == 0)
- return NO_RESPONSE; /* no nameservers found */
- else
- return TIME_OUT; /* no answer obtained */
- else
- if (errno == ECONNREFUSED)
- return NO_RESPONSE;
- else
- return ERROR;
-}
-
-/*
- * This routine is for closing the socket if a virtual circuit is used and
- * the program wants to close it.
- *
- * Called from the interrupt handler.
- */
-SendRequest_close()
-{
- if (s != -1) {
- (void) close(s);
- s = -1;
- }
-}
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