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-rw-r--r--c/src/exec/libnetworking/libc/res_send.c929
1 files changed, 0 insertions, 929 deletions
diff --git a/c/src/exec/libnetworking/libc/res_send.c b/c/src/exec/libnetworking/libc/res_send.c
deleted file mode 100644
index 08cb78490f..0000000000
--- a/c/src/exec/libnetworking/libc/res_send.c
+++ /dev/null
@@ -1,929 +0,0 @@
-/*
- * Copyright (c) 1985, 1989, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-/*
- * Portions Copyright (c) 1993 by Digital Equipment Corporation.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies, and that
- * the name of Digital Equipment Corporation not be used in advertising or
- * publicity pertaining to distribution of the document or software without
- * specific, written prior permission.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
- * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
- * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
- * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
- * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
- * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
- * SOFTWARE.
- */
-
-/*
- * Portions Copyright (c) 1996 by Internet Software Consortium.
- *
- * 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.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
- * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
- * CONSORTIUM 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.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)res_send.c 8.1 (Berkeley) 6/4/93";
-static char orig_rcsid[] = "From: Id: res_send.c,v 8.20 1998/04/06 23:27:51 halley Exp $";
-static char rcsid[] = "$Id$";
-#endif /* LIBC_SCCS and not lint */
-
-/*
- * Send query to name server and wait for reply.
- */
-
-#include <sys/types.h>
-#include <sys/param.h>
-#include <sys/time.h>
-#include <sys/socket.h>
-#include <sys/uio.h>
-
-#include <netinet/in.h>
-#include <arpa/nameser.h>
-#include <arpa/inet.h>
-
-#include <errno.h>
-#include <netdb.h>
-#include <resolv.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <poll.h>
-
-#include "res_config.h"
-
-#if !defined(__rtems__)
-#ifdef NOPOLL /* libc_r doesn't wrap poll yet() */
-static int use_poll = 0;
-#else
-static int use_poll = 1; /* adapt to poll() syscall availability */
- /* 0 = not present, 1 = try it, 2 = exists */
-#endif
-#endif
-
-static int s = -1; /* socket used for communications */
-static int connected = 0; /* is the socket connected */
-static int vc = 0; /* is the socket a virtual circuit? */
-static res_send_qhook Qhook = NULL;
-static res_send_rhook Rhook = NULL;
-
-
-#define CAN_RECONNECT 1
-
-#ifndef DEBUG
-# define Dprint(cond, args) /*empty*/
-# define DprintQ(cond, args, query, size) /*empty*/
-# define Aerror(file, string, error, address) /*empty*/
-# define Perror(file, string, error) /*empty*/
-#else
-# define Dprint(cond, args) if (cond) {fprintf args;} else {}
-# define DprintQ(cond, args, query, size) if (cond) {\
- fprintf args;\
- __fp_nquery(query, size, stdout);\
- } else {}
- static void
- Aerror(file, string, error, address)
- FILE *file;
- char *string;
- int error;
- struct sockaddr_in address;
- {
- int save = errno;
-
- if (_res.options & RES_DEBUG) {
- fprintf(file, "res_send: %s ([%s].%u): %s\n",
- string,
- inet_ntoa(address.sin_addr),
- ntohs(address.sin_port),
- strerror(error));
- }
- errno = save;
- }
- static void
- Perror(file, string, error)
- FILE *file;
- char *string;
- int error;
- {
- int save = errno;
-
- if (_res.options & RES_DEBUG) {
- fprintf(file, "res_send: %s: %s\n",
- string, strerror(error));
- }
- errno = save;
- }
-#endif
-
-void
-res_send_setqhook(hook)
- res_send_qhook hook;
-{
-
- Qhook = hook;
-}
-
-void
-res_send_setrhook(hook)
- res_send_rhook hook;
-{
-
- Rhook = hook;
-}
-
-/* int
- * res_isourserver(ina)
- * looks up "ina" in _res.ns_addr_list[]
- * returns:
- * 0 : not found
- * >0 : found
- * author:
- * paul vixie, 29may94
- */
-int
-res_isourserver(inp)
- const struct sockaddr_in *inp;
-{
- struct sockaddr_in ina;
- int ns, ret;
-
- ina = *inp;
- ret = 0;
- for (ns = 0; ns < _res.nscount; ns++) {
- const struct sockaddr_in *srv = &_res.nsaddr_list[ns];
-
- if (srv->sin_family == ina.sin_family &&
- srv->sin_port == ina.sin_port &&
- (srv->sin_addr.s_addr == INADDR_ANY ||
- srv->sin_addr.s_addr == ina.sin_addr.s_addr)) {
- ret++;
- break;
- }
- }
- return (ret);
-}
-
-/* int
- * res_nameinquery(name, type, class, buf, eom)
- * look for (name,type,class) in the query section of packet (buf,eom)
- * requires:
- * buf + HFIXEDSZ <= eom
- * returns:
- * -1 : format error
- * 0 : not found
- * >0 : found
- * author:
- * paul vixie, 29may94
- */
-int
-res_nameinquery(name, type, class, buf, eom)
- const char *name;
- int type, class;
- const u_char *buf, *eom;
-{
- const u_char *cp = buf + HFIXEDSZ;
- int qdcount = ntohs(((HEADER*)buf)->qdcount);
-
- while (qdcount-- > 0) {
- char tname[MAXDNAME+1];
- int n, ttype, tclass;
-
- n = dn_expand(buf, eom, cp, tname, sizeof tname);
- if (n < 0)
- return (-1);
- cp += n;
- if (cp + 2 * INT16SZ > eom)
- return (-1);
- ttype = ns_get16(cp); cp += INT16SZ;
- tclass = ns_get16(cp); cp += INT16SZ;
- if (ttype == type &&
- tclass == class &&
- strcasecmp(tname, name) == 0)
- return (1);
- }
- return (0);
-}
-
-/* int
- * res_queriesmatch(buf1, eom1, buf2, eom2)
- * is there a 1:1 mapping of (name,type,class)
- * in (buf1,eom1) and (buf2,eom2)?
- * returns:
- * -1 : format error
- * 0 : not a 1:1 mapping
- * >0 : is a 1:1 mapping
- * author:
- * paul vixie, 29may94
- */
-int
-res_queriesmatch(buf1, eom1, buf2, eom2)
- const u_char *buf1, *eom1;
- const u_char *buf2, *eom2;
-{
- const u_char *cp = buf1 + HFIXEDSZ;
- int qdcount = ntohs(((HEADER*)buf1)->qdcount);
-
- if (buf1 + HFIXEDSZ > eom1 || buf2 + HFIXEDSZ > eom2)
- return (-1);
-
- /*
- * Only header section present in replies to
- * dynamic update packets.
- */
- if ( (((HEADER *)buf1)->opcode == ns_o_update) &&
- (((HEADER *)buf2)->opcode == ns_o_update) )
- return (1);
-
- if (qdcount != ntohs(((HEADER*)buf2)->qdcount))
- return (0);
- while (qdcount-- > 0) {
- char tname[MAXDNAME+1];
- int n, ttype, tclass;
-
- n = dn_expand(buf1, eom1, cp, tname, sizeof tname);
- if (n < 0)
- return (-1);
- cp += n;
- if (cp + 2 * INT16SZ > eom1)
- return (-1);
- ttype = ns_get16(cp); cp += INT16SZ;
- tclass = ns_get16(cp); cp += INT16SZ;
- if (!res_nameinquery(tname, ttype, tclass, buf2, eom2))
- return (0);
- }
- return (1);
-}
-
-int
-res_send(buf, buflen, ans, anssiz)
- const u_char *buf;
- int buflen;
- u_char *ans;
- int anssiz;
-{
- HEADER *hp = (HEADER *) buf;
- HEADER *anhp = (HEADER *) ans;
- int gotsomewhere, connreset, terrno, try, v_circuit, resplen, ns, n;
- u_int badns; /* XXX NSMAX can't exceed #/bits in this variable */
-
- if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
- /* errno should have been set by res_init() in this case. */
- return (-1);
- }
- if (anssiz < HFIXEDSZ) {
- errno = EINVAL;
- return (-1);
- }
- DprintQ((_res.options & RES_DEBUG) || (_res.pfcode & RES_PRF_QUERY),
- (stdout, ";; res_send()\n"), buf, buflen);
- v_circuit = (_res.options & RES_USEVC) || buflen > PACKETSZ;
- gotsomewhere = 0;
- connreset = 0;
- terrno = ETIMEDOUT;
- badns = 0;
-
- /*
- * Send request, RETRY times, or until successful
- */
- for (try = 0; try < _res.retry; try++) {
- for (ns = 0; ns < _res.nscount; ns++) {
- struct sockaddr_in *nsap = &_res.nsaddr_list[ns];
- same_ns:
- if (badns & (1 << ns)) {
- res_close();
- goto next_ns;
- }
-
- if (Qhook) {
- int done = 0, loops = 0;
-
- do {
- res_sendhookact act;
-
- act = (*Qhook)(&nsap, &buf, &buflen,
- ans, anssiz, &resplen);
- switch (act) {
- case res_goahead:
- done = 1;
- break;
- case res_nextns:
- res_close();
- 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);
- }
-
- Dprint(_res.options & RES_DEBUG,
- (stdout, ";; Querying server (# %d) address = %s\n",
- ns + 1, inet_ntoa(nsap->sin_addr)));
-
- if (v_circuit) {
- int truncated;
-#if !defined(__rtems__)
- struct iovec iov[2];
-#endif
- u_short len;
- u_char *cp;
-
- /*
- * Use virtual circuit;
- * at most one attempt per server.
- */
- try = _res.retry;
- truncated = 0;
- if (s < 0 || !vc || hp->opcode == ns_o_update) {
- if (s >= 0)
- res_close();
-
- s = socket(PF_INET, SOCK_STREAM, 0);
- if (s < 0) {
- terrno = errno;
- Perror(stderr, "socket(vc)", errno);
- return (-1);
- }
- errno = 0;
- if (connect(s, (struct sockaddr *)nsap,
- sizeof *nsap) < 0) {
- terrno = errno;
- Aerror(stderr, "connect/vc",
- errno, *nsap);
- badns |= (1 << ns);
- res_close();
- goto next_ns;
- }
- vc = 1;
- }
- /*
- * Send length & message
- */
- putshort((u_short)buflen, (u_char*)&len);
-#if !defined(__rtems__)
- iov[0].iov_base = (caddr_t)&len;
- iov[0].iov_len = INT16SZ;
- iov[1].iov_base = (caddr_t)buf;
- iov[1].iov_len = buflen;
- if (writev(s, iov, 2) != (INT16SZ + buflen)) {
-#else
- /*
- * RTEMS doesn't have writev (yet)
- */
- if ((write (s, &len, INT16SZ) != INT16SZ)
- || (write (s, buf, buflen) != buflen)) {
-#endif
- terrno = errno;
- Perror(stderr, "write failed", errno);
- badns |= (1 << ns);
- res_close();
- goto next_ns;
- }
- /*
- * Receive length & response
- */
-read_len:
- cp = ans;
- len = INT16SZ;
- while ((n = read(s, (char *)cp, (int)len)) > 0) {
- cp += n;
- if ((len -= n) <= 0)
- break;
- }
- if (n <= 0) {
- terrno = errno;
- Perror(stderr, "read failed", errno);
- res_close();
- /*
- * 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_close();
- goto same_ns;
- }
- res_close();
- goto next_ns;
- }
- resplen = ns_get16(ans);
- if (resplen > anssiz) {
- Dprint(_res.options & RES_DEBUG,
- (stdout, ";; response truncated\n")
- );
- truncated = 1;
- len = anssiz;
- } else
- len = resplen;
- if (len < HFIXEDSZ) {
- /*
- * Undersized message.
- */
- Dprint(_res.options & RES_DEBUG,
- (stdout, ";; undersized: %d\n", len));
- terrno = EMSGSIZE;
- badns |= (1 << ns);
- res_close();
- goto next_ns;
- }
- cp = ans;
- while (len != 0 &&
- (n = read(s, (char *)cp, (int)len)) > 0) {
- cp += n;
- len -= n;
- }
- if (n <= 0) {
- terrno = errno;
- Perror(stderr, "read(vc)", errno);
- res_close();
- goto next_ns;
- }
- if (truncated) {
- /*
- * Flush rest of answer
- * so connection stays in synch.
- */
- anhp->tc = 1;
- len = resplen - anssiz;
- while (len != 0) {
- char junk[PACKETSZ];
-
- n = (len > sizeof(junk)
- ? sizeof(junk)
- : len);
- if ((n = read(s, junk, n)) > 0)
- len -= n;
- else
- break;
- }
- }
- /*
- * 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. Anyway drop the packet and
- * wait for the correct one.
- */
- if (hp->id != anhp->id) {
- DprintQ((_res.options & RES_DEBUG) ||
- (_res.pfcode & RES_PRF_REPLY),
- (stdout, ";; old answer (unexpected):\n"),
- ans, (resplen>anssiz)?anssiz:resplen);
- goto read_len;
- }
- } else {
- /*
- * Use datagrams.
- */
-#ifndef NOPOLL
- struct pollfd pfd;
- int msec;
-#endif
- struct timeval timeout;
-#ifndef NOSELECT
- fd_set dsmask, *dsmaskp;
- int dsmasklen;
-#endif
- struct sockaddr_in from;
- int fromlen;
-
- if ((s < 0) || vc) {
- if (vc)
- res_close();
- s = socket(PF_INET, SOCK_DGRAM, 0);
- if (s < 0) {
-#ifndef CAN_RECONNECT
- bad_dg_sock:
-#endif
- terrno = errno;
- Perror(stderr, "socket(dg)", errno);
- return (-1);
- }
- connected = 0;
- }
-#ifndef CANNOT_CONNECT_DGRAM
- /*
- * 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 we have sent queries to at least two servers,
- * however, we don't want to remain connected,
- * as we wish to receive answers from the first
- * server to respond.
- */
- if (_res.nscount == 1 || (try == 0 && ns == 0)) {
- /*
- * Connect only if we are sure we won't
- * receive a response from another server.
- */
- if (!connected) {
- if (connect(s, (struct sockaddr *)nsap,
- sizeof *nsap
- ) < 0) {
- Aerror(stderr,
- "connect(dg)",
- errno, *nsap);
- badns |= (1 << ns);
- res_close();
- goto next_ns;
- }
- connected = 1;
- }
- if (send(s, (char*)buf, buflen, 0) != buflen) {
- Perror(stderr, "send", errno);
- badns |= (1 << ns);
- res_close();
- goto next_ns;
- }
- } else {
- /*
- * Disconnect if we want to listen
- * for responses from more than one server.
- */
- if (connected) {
-#ifdef CAN_RECONNECT
- struct sockaddr_in no_addr;
-
- no_addr.sin_family = AF_INET;
- no_addr.sin_addr.s_addr = INADDR_ANY;
- no_addr.sin_port = 0;
- (void) connect(s,
- (struct sockaddr *)
- &no_addr,
- sizeof no_addr);
-#else
- int s1 = socket(PF_INET, SOCK_DGRAM,0);
- if (s1 < 0)
- goto bad_dg_sock;
- (void) dup2(s1, s);
- (void) close(s1);
- Dprint(_res.options & RES_DEBUG,
- (stdout, ";; new DG socket\n"))
-#endif /* CAN_RECONNECT */
- connected = 0;
- errno = 0;
- }
-#endif /* !CANNOT_CONNECT_DGRAM */
- if (sendto(s, (char*)buf, buflen, 0,
- (struct sockaddr *)nsap,
- sizeof *nsap)
- != buflen) {
- Aerror(stderr, "sendto", errno, *nsap);
- badns |= (1 << ns);
- res_close();
- goto next_ns;
- }
-#ifndef CANNOT_CONNECT_DGRAM
- }
-#endif /* !CANNOT_CONNECT_DGRAM */
-
- /*
- * Wait for reply
- */
-#ifndef NOPOLL
- othersyscall:
- if (use_poll) {
- msec = (_res.retrans << try) * 1000;
- if (try > 0)
- msec /= _res.nscount;
- if (msec <= 0)
- msec = 1000;
- } else {
-#endif
- timeout.tv_sec = (_res.retrans << try);
- if (try > 0)
- timeout.tv_sec /= _res.nscount;
- if ((long) timeout.tv_sec <= 0)
- timeout.tv_sec = 1;
- timeout.tv_usec = 0;
-#ifndef NOPOLL
- }
-#endif
- wait:
- if (s < 0) {
- Perror(stderr, "s out-of-bounds", EMFILE);
- res_close();
- goto next_ns;
- }
-#ifndef NOPOLL
- if (use_poll) {
- struct sigaction sa, osa;
- int sigsys_installed = 0;
-
- pfd.fd = s;
- pfd.events = POLLIN;
- if (use_poll == 1) {
- bzero(&sa, sizeof(sa));
- sa.sa_handler = SIG_IGN;
- if (sigaction(SIGSYS, &sa, &osa) >= 0)
- sigsys_installed = 1;
- }
- n = poll(&pfd, 1, msec);
- if (sigsys_installed == 1) {
- int oerrno = errno;
- sigaction(SIGSYS, &osa, NULL);
- errno = oerrno;
- }
- /* XXX why does nosys() return EINVAL? */
- if (n < 0 && (errno == ENOSYS ||
- errno == EINVAL)) {
- use_poll = 0;
- goto othersyscall;
- } else if (use_poll == 1)
- use_poll = 2;
- if (n < 0) {
- if (errno == EINTR)
- goto wait;
- Perror(stderr, "poll", errno);
- res_close();
- goto next_ns;
- }
- } else {
-#endif
-#ifndef NOSELECT
- dsmasklen = howmany(s + 1, NFDBITS) *
- sizeof(fd_mask);
- if (dsmasklen > sizeof(fd_set)) {
- dsmaskp = (fd_set *)malloc(dsmasklen);
- if (dsmaskp == NULL) {
- res_close();
- goto next_ns;
- }
- } else
- dsmaskp = &dsmask;
- /* only zero what we need */
- bzero((char *)dsmaskp, dsmasklen);
- FD_SET(s, dsmaskp);
- n = select(s + 1, dsmaskp, (fd_set *)NULL,
- (fd_set *)NULL, &timeout);
- if (dsmaskp != &dsmask)
- free(dsmaskp);
- if (n < 0) {
- if (errno == EINTR)
- goto wait;
- Perror(stderr, "select", errno);
- res_close();
- goto next_ns;
- }
-#endif
-#ifndef NOPOLL
- }
-#endif
-
-#ifdef NOSELECT
- setsockopt (s, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof timeout);
-#else
- if (n == 0) {
- /*
- * timeout
- */
- Dprint(_res.options & RES_DEBUG,
- (stdout, ";; timeout\n"));
- gotsomewhere = 1;
- res_close();
- goto next_ns;
- }
-#endif
- errno = 0;
- fromlen = sizeof(struct sockaddr_in);
- resplen = recvfrom(s, (char*)ans, anssiz, 0,
- (struct sockaddr *)&from, &fromlen);
- if (resplen <= 0) {
-#ifdef NOSELECT
- if (errno == ETIMEDOUT) {
- Dprint(_res.options & RES_DEBUG,
- (stdout, ";; timeout\n"));
- gotsomewhere = 1;
- res_close();
- goto next_ns;
- }
-#endif
- Perror(stderr, "recvfrom", errno);
- res_close();
- goto next_ns;
- }
- gotsomewhere = 1;
- if (resplen < HFIXEDSZ) {
- /*
- * Undersized message.
- */
- Dprint(_res.options & RES_DEBUG,
- (stdout, ";; undersized: %d\n",
- resplen));
- terrno = EMSGSIZE;
- badns |= (1 << ns);
- res_close();
- goto next_ns;
- }
- if (hp->id != anhp->id) {
- /*
- * response from old query, ignore it.
- * XXX - potential security hazard could
- * be detected here.
- */
- DprintQ((_res.options & RES_DEBUG) ||
- (_res.pfcode & RES_PRF_REPLY),
- (stdout, ";; old answer:\n"),
- ans, (resplen>anssiz)?anssiz:resplen);
- goto wait;
- }
-#ifdef CHECK_SRVR_ADDR
- if (!(_res.options & RES_INSECURE1) &&
- !res_isourserver(&from)) {
- /*
- * response from wrong server? ignore it.
- * XXX - potential security hazard could
- * be detected here.
- */
- DprintQ((_res.options & RES_DEBUG) ||
- (_res.pfcode & RES_PRF_REPLY),
- (stdout, ";; not our server:\n"),
- ans, (resplen>anssiz)?anssiz:resplen);
- goto wait;
- }
-#endif
- if (!(_res.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((_res.options & RES_DEBUG) ||
- (_res.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(_res.options & RES_DEBUG,
- (stdout, "server rejected query:\n"),
- ans, (resplen>anssiz)?anssiz:resplen);
- badns |= (1 << ns);
- res_close();
- /* don't retry if called from dig */
- if (!_res.pfcode)
- goto next_ns;
- }
- if (!(_res.options & RES_IGNTC) && anhp->tc) {
- /*
- * get rest of answer;
- * use TCP with same server.
- */
- Dprint(_res.options & RES_DEBUG,
- (stdout, ";; truncated answer\n"));
- v_circuit = 1;
- res_close();
- goto same_ns;
- }
- } /*if vc/dg*/
- Dprint((_res.options & RES_DEBUG) ||
- ((_res.pfcode & RES_PRF_REPLY) &&
- (_res.pfcode & RES_PRF_HEAD1)),
- (stdout, ";; got answer:\n"));
- DprintQ((_res.options & RES_DEBUG) ||
- (_res.pfcode & RES_PRF_REPLY),
- (stdout, "%s", ""),
- ans, (resplen>anssiz)?anssiz:resplen);
- /*
- * If using virtual circuits, we assume that the first server
- * is preferred over the rest (i.e. it is on the local
- * machine) and only keep that one open.
- * 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 && (!(_res.options & RES_USEVC) || ns != 0)) ||
- !(_res.options & RES_STAYOPEN)) {
- res_close();
- }
- if (Rhook) {
- int done = 0, loops = 0;
-
- do {
- res_sendhookact act;
-
- act = (*Rhook)(nsap, buf, buflen,
- ans, anssiz, &resplen);
- switch (act) {
- case res_goahead:
- case res_done:
- done = 1;
- break;
- case res_nextns:
- res_close();
- 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_close();
- if (!v_circuit) {
- if (!gotsomewhere)
- errno = ECONNREFUSED; /* no nameservers found */
- else
- errno = ETIMEDOUT; /* no answer obtained */
- } else
- errno = terrno;
- return (-1);
-}
-
-/*
- * This routine is for closing the socket if a virtual circuit is used and
- * the program wants to close it. This provides support for endhostent()
- * which expects to close the socket.
- *
- * This routine is not expected to be user visible.
- */
-void
-res_close()
-{
- if (s >= 0) {
- (void) close(s);
- s = -1;
- connected = 0;
- vc = 0;
- }
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-24 02:52:39 +0000