2 * Copyright (c) 1985, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
37 * Permission to use, copy, modify, and distribute this software for any
38 * purpose with or without fee is hereby granted, provided that the above
39 * copyright notice and this permission notice appear in all copies, and that
40 * the name of Digital Equipment Corporation not be used in advertising or
41 * publicity pertaining to distribution of the document or software without
42 * specific, written prior permission.
44 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
45 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
46 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
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48 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
49 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
50 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
55 * Copyright (c) 2005 by Internet Systems Consortium, Inc. ("ISC")
56 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
58 * Permission to use, copy, modify, and distribute this software for any
59 * purpose with or without fee is hereby granted, provided that the above
60 * copyright notice and this permission notice appear in all copies.
62 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
63 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
64 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
65 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
66 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
67 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
68 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
71 #if defined(LIBC_SCCS) && !defined(lint)
72 static const char sccsid[] = "@(#)res_send.c 8.1 (Berkeley) 6/4/93";
73 static const char rcsid[] = "$Id: res_send.c,v 1.18.10.1 2008/01/27 02:06:46 marka Exp $";
74 #endif /* LIBC_SCCS and not lint */
78 * Send query to name server and wait for reply.
81 #include "port_before.h"
83 #include "fd_setsize.h"
87 #include "namespace.h"
89 #include <sys/types.h>
90 #include <sys/param.h>
92 #include <sys/socket.h>
95 #include <netinet/in.h>
96 #include <arpa/nameser.h>
97 #include <arpa/inet.h>
108 #include "isc/eventlib.h"
110 #include "port_after.h"
112 #include <sys/event.h>
116 #ifdef HAVE_STROPTS_H
120 #endif /* USE_POLL */
124 #include "un-namespace.h"
127 /* Options. Leave them on. */
129 #include "res_debug.h"
130 #include "res_private.h"
132 #define EXT(res) ((res)->_u._ext)
134 #if !defined(USE_POLL) && !defined(USE_KQUEUE)
135 static const int highestFD = FD_SETSIZE - 1;
137 static int highestFD = 0;
142 static int get_salen __P((const struct sockaddr *));
143 static struct sockaddr * get_nsaddr __P((res_state, size_t));
144 static int send_vc(res_state, const u_char *, int,
145 u_char *, int, int *, int);
146 static int send_dg(res_state,
151 u_char *, int, int *, int, int,
153 static void Aerror(const res_state, FILE *, const char *, int,
154 const struct sockaddr *, int);
155 static void Perror(const res_state, FILE *, const char *, int);
156 static int sock_eq(struct sockaddr *, struct sockaddr *);
157 #if defined(NEED_PSELECT) && !defined(USE_POLL) && !defined(USE_KQUEUE)
158 static int pselect(int, void *, void *, void *,
162 void res_pquery(const res_state, const u_char *, int, FILE *);
164 static const int niflags = NI_NUMERICHOST | NI_NUMERICSERV;
169 * looks up "ina" in _res.ns_addr_list[]
176 *\li paul vixie, 29may94
179 res_ourserver_p(const res_state statp, const struct sockaddr *sa) {
180 const struct sockaddr_in *inp, *srv;
181 const struct sockaddr_in6 *in6p, *srv6;
184 switch (sa->sa_family) {
186 inp = (const struct sockaddr_in *)sa;
187 for (ns = 0; ns < statp->nscount; ns++) {
188 srv = (struct sockaddr_in *)get_nsaddr(statp, ns);
189 if (srv->sin_family == inp->sin_family &&
190 srv->sin_port == inp->sin_port &&
191 (srv->sin_addr.s_addr == INADDR_ANY ||
192 srv->sin_addr.s_addr == inp->sin_addr.s_addr))
197 if (EXT(statp).ext == NULL)
199 in6p = (const struct sockaddr_in6 *)sa;
200 for (ns = 0; ns < statp->nscount; ns++) {
201 srv6 = (struct sockaddr_in6 *)get_nsaddr(statp, ns);
202 if (srv6->sin6_family == in6p->sin6_family &&
203 srv6->sin6_port == in6p->sin6_port &&
204 #ifdef HAVE_SIN6_SCOPE_ID
205 (srv6->sin6_scope_id == 0 ||
206 srv6->sin6_scope_id == in6p->sin6_scope_id) &&
208 (IN6_IS_ADDR_UNSPECIFIED(&srv6->sin6_addr) ||
209 IN6_ARE_ADDR_EQUAL(&srv6->sin6_addr, &in6p->sin6_addr)))
220 * look for (name,type,class) in the query section of packet (buf,eom)
223 *\li buf + HFIXEDSZ <= eom
226 *\li -1 : format error
231 *\li paul vixie, 29may94
234 res_nameinquery(const char *name, int type, int class,
235 const u_char *buf, const u_char *eom)
237 const u_char *cp = buf + HFIXEDSZ;
238 int qdcount = ntohs(((const HEADER*)buf)->qdcount);
240 while (qdcount-- > 0) {
241 char tname[MAXDNAME+1];
242 int n, ttype, tclass;
244 n = dn_expand(buf, eom, cp, tname, sizeof tname);
248 if (cp + 2 * INT16SZ > eom)
250 ttype = ns_get16(cp); cp += INT16SZ;
251 tclass = ns_get16(cp); cp += INT16SZ;
252 if (ttype == type && tclass == class &&
253 ns_samename(tname, name) == 1)
260 * is there a 1:1 mapping of (name,type,class)
261 * in (buf1,eom1) and (buf2,eom2)?
264 *\li -1 : format error
265 *\li 0 : not a 1:1 mapping
266 *\li >0 : is a 1:1 mapping
269 *\li paul vixie, 29may94
272 res_queriesmatch(const u_char *buf1, const u_char *eom1,
273 const u_char *buf2, const u_char *eom2)
275 const u_char *cp = buf1 + HFIXEDSZ;
276 int qdcount = ntohs(((const HEADER*)buf1)->qdcount);
278 if (buf1 + HFIXEDSZ > eom1 || buf2 + HFIXEDSZ > eom2)
282 * Only header section present in replies to
283 * dynamic update packets.
285 if ((((const HEADER *)buf1)->opcode == ns_o_update) &&
286 (((const HEADER *)buf2)->opcode == ns_o_update))
289 if (qdcount != ntohs(((const HEADER*)buf2)->qdcount))
291 while (qdcount-- > 0) {
292 char tname[MAXDNAME+1];
293 int n, ttype, tclass;
295 n = dn_expand(buf1, eom1, cp, tname, sizeof tname);
299 if (cp + 2 * INT16SZ > eom1)
301 ttype = ns_get16(cp); cp += INT16SZ;
302 tclass = ns_get16(cp); cp += INT16SZ;
303 if (!res_nameinquery(tname, ttype, tclass, buf2, eom2))
310 res_nsend(res_state statp,
311 const u_char *buf, int buflen, u_char *ans, int anssiz)
313 int gotsomewhere, terrno, tries, v_circuit, resplen, ns, n;
317 char abuf[NI_MAXHOST];
320 highestFD = sysconf(_SC_OPEN_MAX) - 1;
323 /* No name servers or res_init() failure */
324 if (statp->nscount == 0 || EXT(statp).ext == NULL) {
328 if (anssiz < HFIXEDSZ) {
332 DprintQ((statp->options & RES_DEBUG) || (statp->pfcode & RES_PRF_QUERY),
333 (stdout, ";; res_send()\n"), buf, buflen);
334 v_circuit = (statp->options & RES_USEVC) || buflen > PACKETSZ;
339 if ((kq = kqueue()) < 0) {
340 Perror(statp, stderr, "kqueue", errno);
346 * If the ns_addr_list in the resolver context has changed, then
347 * invalidate our cached copy and the associated timing data.
349 if (EXT(statp).nscount != 0) {
351 struct sockaddr_storage peer;
352 ISC_SOCKLEN_T peerlen;
354 if (EXT(statp).nscount != statp->nscount)
357 for (ns = 0; ns < statp->nscount; ns++) {
358 if (statp->nsaddr_list[ns].sin_family &&
359 !sock_eq((struct sockaddr *)&statp->nsaddr_list[ns],
360 (struct sockaddr *)&EXT(statp).ext->nsaddrs[ns])) {
365 if (EXT(statp).nssocks[ns] == -1)
367 peerlen = sizeof(peer);
369 if (getsockname(EXT(statp).nssocks[ns],
371 if (_getsockname(EXT(statp).nssocks[ns],
373 (struct sockaddr *)&peer, &peerlen) < 0) {
377 if (!sock_eq((struct sockaddr *)&peer,
378 get_nsaddr(statp, ns))) {
385 EXT(statp).nscount = 0;
390 * Maybe initialize our private copy of the ns_addr_list.
392 if (EXT(statp).nscount == 0) {
393 for (ns = 0; ns < statp->nscount; ns++) {
394 EXT(statp).nstimes[ns] = RES_MAXTIME;
395 EXT(statp).nssocks[ns] = -1;
396 if (!statp->nsaddr_list[ns].sin_family)
398 EXT(statp).ext->nsaddrs[ns].sin =
399 statp->nsaddr_list[ns];
401 EXT(statp).nscount = statp->nscount;
405 * Some resolvers want to even out the load on their nameservers.
406 * Note that RES_BLAST overrides RES_ROTATE.
408 if ((statp->options & RES_ROTATE) != 0U &&
409 (statp->options & RES_BLAST) == 0U) {
410 union res_sockaddr_union inu;
411 struct sockaddr_in ina;
412 int lastns = statp->nscount - 1;
416 if (EXT(statp).ext != NULL)
417 inu = EXT(statp).ext->nsaddrs[0];
418 ina = statp->nsaddr_list[0];
419 fd = EXT(statp).nssocks[0];
420 nstime = EXT(statp).nstimes[0];
421 for (ns = 0; ns < lastns; ns++) {
422 if (EXT(statp).ext != NULL)
423 EXT(statp).ext->nsaddrs[ns] =
424 EXT(statp).ext->nsaddrs[ns + 1];
425 statp->nsaddr_list[ns] = statp->nsaddr_list[ns + 1];
426 EXT(statp).nssocks[ns] = EXT(statp).nssocks[ns + 1];
427 EXT(statp).nstimes[ns] = EXT(statp).nstimes[ns + 1];
429 if (EXT(statp).ext != NULL)
430 EXT(statp).ext->nsaddrs[lastns] = inu;
431 statp->nsaddr_list[lastns] = ina;
432 EXT(statp).nssocks[lastns] = fd;
433 EXT(statp).nstimes[lastns] = nstime;
437 * Send request, RETRY times, or until successful.
439 for (tries = 0; tries < statp->retry; tries++) {
440 for (ns = 0; ns < statp->nscount; ns++) {
441 struct sockaddr *nsap;
443 nsap = get_nsaddr(statp, ns);
444 nsaplen = get_salen(nsap);
445 statp->_flags &= ~RES_F_LASTMASK;
446 statp->_flags |= (ns << RES_F_LASTSHIFT);
449 int done = 0, loops = 0;
454 act = (*statp->qhook)(&nsap, &buf, &buflen,
455 ans, anssiz, &resplen);
469 /* give the hook another try */
470 if (++loops < 42) /*doug adams*/
481 Dprint(((statp->options & RES_DEBUG) &&
482 getnameinfo(nsap, nsaplen, abuf, sizeof(abuf),
483 NULL, 0, niflags) == 0),
484 (stdout, ";; Querying server (# %d) address = %s\n",
489 /* Use VC; at most one attempt per server. */
490 tries = statp->retry;
491 n = send_vc(statp, buf, buflen, ans, anssiz, &terrno,
504 buf, buflen, ans, anssiz, &terrno,
505 ns, tries, &v_circuit, &gotsomewhere);
515 Dprint((statp->options & RES_DEBUG) ||
516 ((statp->pfcode & RES_PRF_REPLY) &&
517 (statp->pfcode & RES_PRF_HEAD1)),
518 (stdout, ";; got answer:\n"));
520 DprintQ((statp->options & RES_DEBUG) ||
521 (statp->pfcode & RES_PRF_REPLY),
523 ans, (resplen > anssiz) ? anssiz : resplen);
526 * If we have temporarily opened a virtual circuit,
527 * or if we haven't been asked to keep a socket open,
530 if ((v_circuit && (statp->options & RES_USEVC) == 0U) ||
531 (statp->options & RES_STAYOPEN) == 0U) {
535 int done = 0, loops = 0;
540 act = (*statp->rhook)(nsap, buf, buflen,
541 ans, anssiz, &resplen);
551 /* give the hook another try */
552 if (++loops < 42) /*doug adams*/
576 errno = ECONNREFUSED; /*%< no nameservers found */
578 errno = ETIMEDOUT; /*%< no answer obtained */
591 const struct sockaddr *sa;
595 /* There are people do not set sa_len. Be forgiving to them. */
600 if (sa->sa_family == AF_INET)
601 return (sizeof(struct sockaddr_in));
602 else if (sa->sa_family == AF_INET6)
603 return (sizeof(struct sockaddr_in6));
605 return (0); /*%< unknown, die on connect */
609 * pick appropriate nsaddr_list for use. see res_init() for initialization.
611 static struct sockaddr *
617 if (!statp->nsaddr_list[n].sin_family && EXT(statp).ext) {
619 * - EXT(statp).ext->nsaddrs[n] holds an address that is larger
620 * than struct sockaddr, and
621 * - user code did not update statp->nsaddr_list[n].
623 return (struct sockaddr *)(void *)&EXT(statp).ext->nsaddrs[n];
626 * - user code updated statp->nsaddr_list[n], or
627 * - statp->nsaddr_list[n] has the same content as
628 * EXT(statp).ext->nsaddrs[n].
630 return (struct sockaddr *)(void *)&statp->nsaddr_list[n];
635 send_vc(res_state statp,
636 const u_char *buf, int buflen, u_char *ans, int anssiz,
639 const HEADER *hp = (const HEADER *) buf;
640 HEADER *anhp = (HEADER *) ans;
641 struct sockaddr *nsap;
643 int truncating, connreset, resplen, n;
652 nsap = get_nsaddr(statp, ns);
653 nsaplen = get_salen(nsap);
659 /* Are we still talking to whom we want to talk to? */
660 if (statp->_vcsock >= 0 && (statp->_flags & RES_F_VC) != 0) {
661 struct sockaddr_storage peer;
662 ISC_SOCKLEN_T size = sizeof peer;
664 if (getpeername(statp->_vcsock,
666 if (_getpeername(statp->_vcsock,
668 (struct sockaddr *)&peer, &size) < 0 ||
669 !sock_eq((struct sockaddr *)&peer, nsap)) {
671 statp->_flags &= ~RES_F_VC;
675 if (statp->_vcsock < 0 || (statp->_flags & RES_F_VC) == 0) {
676 if (statp->_vcsock >= 0)
679 statp->_vcsock = socket(nsap->sa_family, SOCK_STREAM, 0);
681 statp->_vcsock = _socket(nsap->sa_family, SOCK_STREAM, 0);
683 #if !defined(USE_POLL) && !defined(USE_KQUEUE)
684 if (statp->_vcsock > highestFD) {
689 if (statp->_vcsock < 0) {
691 case EPROTONOSUPPORT:
696 Perror(statp, stderr, "socket(vc)", errno);
700 Perror(statp, stderr, "socket(vc)", errno);
706 * Disable generation of SIGPIPE when writing to a closed
707 * socket. Write should return -1 and set errno to EPIPE
710 * Push on even if setsockopt(SO_NOSIGPIPE) fails.
712 (void)setsockopt(statp->_vcsock, SOL_SOCKET, SO_NOSIGPIPE, &on,
717 if (connect(statp->_vcsock, nsap, nsaplen) < 0) {
719 if (_connect(statp->_vcsock, nsap, nsaplen) < 0) {
722 Aerror(statp, stderr, "connect/vc", errno, nsap,
727 statp->_flags |= RES_F_VC;
731 * Send length & message
733 ns_put16((u_short)buflen, (u_char*)&len);
734 iov[0] = evConsIovec(&len, INT16SZ);
736 iov[1] = evConsIovec(tmp, buflen);
738 if (writev(statp->_vcsock, iov, 2) != (INT16SZ + buflen)) {
740 if (_writev(statp->_vcsock, iov, 2) != (INT16SZ + buflen)) {
743 Perror(statp, stderr, "write failed", errno);
748 * Receive length & response
754 while ((n = read(statp->_vcsock, (char *)cp, (int)len)) > 0) {
756 while ((n = _read(statp->_vcsock, (char *)cp, (int)len)) > 0) {
764 Perror(statp, stderr, "read failed", errno);
767 * A long running process might get its TCP
768 * connection reset if the remote server was
769 * restarted. Requery the server instead of
770 * trying a new one. When there is only one
771 * server, this means that a query might work
772 * instead of failing. We only allow one reset
773 * per query to prevent looping.
775 if (*terrno == ECONNRESET && !connreset) {
783 resplen = ns_get16(ans);
784 if (resplen > anssiz) {
785 Dprint(statp->options & RES_DEBUG,
786 (stdout, ";; response truncated\n")
792 if (len < HFIXEDSZ) {
794 * Undersized message.
796 Dprint(statp->options & RES_DEBUG,
797 (stdout, ";; undersized: %d\n", len));
804 while (len != 0 && (n = read(statp->_vcsock, (char *)cp, (int)len)) > 0){
806 while (len != 0 && (n = _read(statp->_vcsock, (char *)cp, (int)len)) > 0){
813 Perror(statp, stderr, "read(vc)", errno);
819 * Flush rest of answer so connection stays in synch.
822 len = resplen - anssiz;
827 n = read(statp->_vcsock, junk,
829 n = _read(statp->_vcsock, junk,
831 (len > sizeof junk) ? sizeof junk : len);
839 * If the calling applicating has bailed out of
840 * a previous call and failed to arrange to have
841 * the circuit closed or the server has got
842 * itself confused, then drop the packet and
843 * wait for the correct one.
845 if (hp->id != anhp->id) {
846 DprintQ((statp->options & RES_DEBUG) ||
847 (statp->pfcode & RES_PRF_REPLY),
848 (stdout, ";; old answer (unexpected):\n"),
849 ans, (resplen > anssiz) ? anssiz: resplen);
854 * All is well, or the error is fatal. Signal that the
855 * next nameserver ought not be tried.
861 send_dg(res_state statp,
865 const u_char *buf, int buflen, u_char *ans,
866 int anssiz, int *terrno, int ns, int tries, int *v_circuit,
869 const HEADER *hp = (const HEADER *) buf;
870 HEADER *anhp = (HEADER *) ans;
871 const struct sockaddr *nsap;
873 struct timespec now, timeout, finish;
874 struct sockaddr_storage from;
875 ISC_SOCKLEN_T fromlen;
876 int resplen, seconds, n, s;
882 struct pollfd pollfd;
888 nsap = get_nsaddr(statp, ns);
889 nsaplen = get_salen(nsap);
890 if (EXT(statp).nssocks[ns] == -1) {
892 EXT(statp).nssocks[ns] = socket(nsap->sa_family, SOCK_DGRAM, 0);
894 EXT(statp).nssocks[ns] = _socket(nsap->sa_family, SOCK_DGRAM, 0);
896 #if !defined(USE_POLL) && !defined(USE_KQUEUE)
897 if (EXT(statp).nssocks[ns] > highestFD) {
902 if (EXT(statp).nssocks[ns] < 0) {
904 case EPROTONOSUPPORT:
909 Perror(statp, stderr, "socket(dg)", errno);
913 Perror(statp, stderr, "socket(dg)", errno);
917 #ifndef CANNOT_CONNECT_DGRAM
919 * On a 4.3BSD+ machine (client and server,
920 * actually), sending to a nameserver datagram
921 * port with no nameserver will cause an
922 * ICMP port unreachable message to be returned.
923 * If our datagram socket is "connected" to the
924 * server, we get an ECONNREFUSED error on the next
925 * socket operation, and select returns if the
926 * error message is received. We can thus detect
927 * the absence of a nameserver without timing out.
930 * When the option "insecure1" is specified, we'd
931 * rather expect to see responses from an "unknown"
932 * address. In order to let the kernel accept such
933 * responses, do not connect the socket here.
934 * XXX: or do we need an explicit option to disable
937 if (!(statp->options & RES_INSECURE1) &&
939 connect(EXT(statp).nssocks[ns], nsap, nsaplen) < 0) {
941 _connect(EXT(statp).nssocks[ns], nsap, nsaplen) < 0) {
943 Aerror(statp, stderr, "connect(dg)", errno, nsap,
948 #endif /* !CANNOT_CONNECT_DGRAM */
949 Dprint(statp->options & RES_DEBUG,
950 (stdout, ";; new DG socket\n"))
952 s = EXT(statp).nssocks[ns];
953 #ifndef CANNOT_CONNECT_DGRAM
954 if (statp->options & RES_INSECURE1) {
960 (const char*)buf, buflen, 0, nsap, nsaplen) != buflen) {
961 Aerror(statp, stderr, "sendto", errno, nsap, nsaplen);
965 } else if (send(s, (const char*)buf, buflen, 0) != buflen) {
966 Perror(statp, stderr, "send", errno);
970 #else /* !CANNOT_CONNECT_DGRAM */
972 if (sendto(s, (const char*)buf, buflen, 0, nsap, nsaplen) != buflen)
974 if (_sendto(s, (const char*)buf, buflen, 0, nsap, nsaplen) != buflen)
977 Aerror(statp, stderr, "sendto", errno, nsap, nsaplen);
981 #endif /* !CANNOT_CONNECT_DGRAM */
986 seconds = (statp->retrans << tries);
988 seconds /= statp->nscount;
992 timeout = evConsTime(seconds, 0);
993 finish = evAddTime(now, timeout);
999 if (evCmpTime(finish, now) > 0)
1000 timeout = evSubTime(finish, now);
1002 timeout = evConsTime(0, 0);
1004 EV_SET(&kv, s, EVFILT_READ, EV_ADD | EV_ONESHOT, 0, 0, 0);
1005 n = _kevent(kq, &kv, 1, &kv, 1, &timeout);
1009 n = pselect(s + 1, &dsmask, NULL, NULL, &timeout, NULL);
1012 timeout = evSubTime(finish, now);
1013 if (timeout.tv_sec < 0)
1014 timeout = evConsTime(0, 0);
1015 polltimeout = 1000*timeout.tv_sec +
1016 timeout.tv_nsec/1000000;
1018 pollfd.events = POLLRDNORM;
1019 n = poll(&pollfd, 1, polltimeout);
1020 #endif /* USE_POLL */
1023 Dprint(statp->options & RES_DEBUG, (stdout, ";; timeout\n"));
1031 Perror(statp, stderr, "kevent", errno);
1034 Perror(statp, stderr, "select", errno);
1036 Perror(statp, stderr, "poll", errno);
1037 #endif /* USE_POLL */
1047 fromlen = sizeof(from);
1049 resplen = recvfrom(s, (char*)ans, anssiz,0,
1051 resplen = _recvfrom(s, (char*)ans, anssiz,0,
1053 (struct sockaddr *)&from, &fromlen);
1055 Perror(statp, stderr, "recvfrom", errno);
1060 if (resplen < HFIXEDSZ) {
1062 * Undersized message.
1064 Dprint(statp->options & RES_DEBUG,
1065 (stdout, ";; undersized: %d\n",
1071 if (hp->id != anhp->id) {
1073 * response from old query, ignore it.
1074 * XXX - potential security hazard could
1077 DprintQ((statp->options & RES_DEBUG) ||
1078 (statp->pfcode & RES_PRF_REPLY),
1079 (stdout, ";; old answer:\n"),
1080 ans, (resplen > anssiz) ? anssiz : resplen);
1083 if (!(statp->options & RES_INSECURE1) &&
1084 !res_ourserver_p(statp, (struct sockaddr *)&from)) {
1086 * response from wrong server? ignore it.
1087 * XXX - potential security hazard could
1090 DprintQ((statp->options & RES_DEBUG) ||
1091 (statp->pfcode & RES_PRF_REPLY),
1092 (stdout, ";; not our server:\n"),
1093 ans, (resplen > anssiz) ? anssiz : resplen);
1096 #ifdef RES_USE_EDNS0
1097 if (anhp->rcode == FORMERR && (statp->options & RES_USE_EDNS0) != 0U) {
1099 * Do not retry if the server do not understand EDNS0.
1100 * The case has to be captured here, as FORMERR packet do not
1101 * carry query section, hence res_queriesmatch() returns 0.
1103 DprintQ(statp->options & RES_DEBUG,
1104 (stdout, "server rejected query with EDNS0:\n"),
1105 ans, (resplen > anssiz) ? anssiz : resplen);
1106 /* record the error */
1107 statp->_flags |= RES_F_EDNS0ERR;
1112 if (!(statp->options & RES_INSECURE2) &&
1113 !res_queriesmatch(buf, buf + buflen,
1114 ans, ans + anssiz)) {
1116 * response contains wrong query? ignore it.
1117 * XXX - potential security hazard could
1120 DprintQ((statp->options & RES_DEBUG) ||
1121 (statp->pfcode & RES_PRF_REPLY),
1122 (stdout, ";; wrong query name:\n"),
1123 ans, (resplen > anssiz) ? anssiz : resplen);
1126 if (anhp->rcode == SERVFAIL ||
1127 anhp->rcode == NOTIMP ||
1128 anhp->rcode == REFUSED) {
1129 DprintQ(statp->options & RES_DEBUG,
1130 (stdout, "server rejected query:\n"),
1131 ans, (resplen > anssiz) ? anssiz : resplen);
1133 /* don't retry if called from dig */
1137 if (!(statp->options & RES_IGNTC) && anhp->tc) {
1139 * To get the rest of answer,
1140 * use TCP with same server.
1142 Dprint(statp->options & RES_DEBUG,
1143 (stdout, ";; truncated answer\n"));
1149 * All is well, or the error is fatal. Signal that the
1150 * next nameserver ought not be tried.
1156 Aerror(const res_state statp, FILE *file, const char *string, int error,
1157 const struct sockaddr *address, int alen)
1160 char hbuf[NI_MAXHOST];
1161 char sbuf[NI_MAXSERV];
1165 if ((statp->options & RES_DEBUG) != 0U) {
1166 if (getnameinfo(address, alen, hbuf, sizeof(hbuf),
1167 sbuf, sizeof(sbuf), niflags)) {
1168 strncpy(hbuf, "?", sizeof(hbuf) - 1);
1169 hbuf[sizeof(hbuf) - 1] = '\0';
1170 strncpy(sbuf, "?", sizeof(sbuf) - 1);
1171 sbuf[sizeof(sbuf) - 1] = '\0';
1173 fprintf(file, "res_send: %s ([%s].%s): %s\n",
1174 string, hbuf, sbuf, strerror(error));
1180 Perror(const res_state statp, FILE *file, const char *string, int error) {
1183 if ((statp->options & RES_DEBUG) != 0U)
1184 fprintf(file, "res_send: %s: %s\n",
1185 string, strerror(error));
1190 sock_eq(struct sockaddr *a, struct sockaddr *b) {
1191 struct sockaddr_in *a4, *b4;
1192 struct sockaddr_in6 *a6, *b6;
1194 if (a->sa_family != b->sa_family)
1196 switch (a->sa_family) {
1198 a4 = (struct sockaddr_in *)a;
1199 b4 = (struct sockaddr_in *)b;
1200 return a4->sin_port == b4->sin_port &&
1201 a4->sin_addr.s_addr == b4->sin_addr.s_addr;
1203 a6 = (struct sockaddr_in6 *)a;
1204 b6 = (struct sockaddr_in6 *)b;
1205 return a6->sin6_port == b6->sin6_port &&
1206 #ifdef HAVE_SIN6_SCOPE_ID
1207 a6->sin6_scope_id == b6->sin6_scope_id &&
1209 IN6_ARE_ADDR_EQUAL(&a6->sin6_addr, &b6->sin6_addr);
1215 #if defined(NEED_PSELECT) && !defined(USE_POLL) && !defined(USE_KQUEUE)
1216 /* XXX needs to move to the porting library. */
1218 pselect(int nfds, void *rfds, void *wfds, void *efds,
1219 struct timespec *tsp, const sigset_t *sigmask)
1221 struct timeval tv, *tvp;
1227 tv = evTimeVal(*tsp);
1231 sigprocmask(SIG_SETMASK, sigmask, &sigs);
1232 n = select(nfds, rfds, wfds, efds, tvp);
1234 sigprocmask(SIG_SETMASK, &sigs, NULL);
1236 *tsp = evTimeSpec(tv);