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
47 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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) 2004 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 1.5.2.7 2004/08/10 02:27:36 marka Exp $";
74 #endif /* LIBC_SCCS and not lint */
77 * Send query to name server and wait for reply.
80 #include "port_before.h"
81 #include "fd_setsize.h"
83 #include <sys/types.h>
84 #include <sys/param.h>
86 #include <sys/socket.h>
89 #include <netinet/in.h>
90 #include <arpa/nameser.h>
91 #include <arpa/inet.h>
102 #include <isc/eventlib.h>
104 #include "port_after.h"
106 /* Options. Leave them on. */
108 #include "res_debug.h"
109 #include "res_private.h"
111 #define EXT(res) ((res)->_u._ext)
113 static const int highestFD
= FD_SETSIZE
- 1;
117 static int get_salen
__P((const struct sockaddr
*));
118 static struct sockaddr
* get_nsaddr
__P((res_state
, size_t));
119 static int send_vc(res_state
, const u_char
*, int,
120 u_char
*, int, int *, int);
121 static int send_dg(res_state
, const u_char
*, int,
122 u_char
*, int, int *, int,
124 static void Aerror(const res_state
, FILE *, const char *, int,
125 const struct sockaddr
*, int);
126 static void Perror(const res_state
, FILE *, const char *, int);
127 static int sock_eq(struct sockaddr
*, struct sockaddr
*);
129 static int pselect(int, void *, void *, void *,
133 void res_pquery(const res_state
, const u_char
*, int, FILE *);
135 static const int niflags
= NI_NUMERICHOST
| NI_NUMERICSERV
;
140 * res_isourserver(ina)
141 * looks up "ina" in _res.ns_addr_list[]
146 * paul vixie, 29may94
149 res_ourserver_p(const res_state statp
, const struct sockaddr
*sa
) {
150 const struct sockaddr_in
*inp
, *srv
;
151 const struct sockaddr_in6
*in6p
, *srv6
;
154 switch (sa
->sa_family
) {
156 inp
= (const struct sockaddr_in
*)sa
;
157 for (ns
= 0; ns
< statp
->nscount
; ns
++) {
158 srv
= (struct sockaddr_in
*)get_nsaddr(statp
, ns
);
159 if (srv
->sin_family
== inp
->sin_family
&&
160 srv
->sin_port
== inp
->sin_port
&&
161 (srv
->sin_addr
.s_addr
== INADDR_ANY
||
162 srv
->sin_addr
.s_addr
== inp
->sin_addr
.s_addr
))
167 if (EXT(statp
).ext
== NULL
)
169 in6p
= (const struct sockaddr_in6
*)sa
;
170 for (ns
= 0; ns
< statp
->nscount
; ns
++) {
171 srv6
= (struct sockaddr_in6
*)get_nsaddr(statp
, ns
);
172 if (srv6
->sin6_family
== in6p
->sin6_family
&&
173 srv6
->sin6_port
== in6p
->sin6_port
&&
174 #ifdef HAVE_SIN6_SCOPE_ID
175 (srv6
->sin6_scope_id
== 0 ||
176 srv6
->sin6_scope_id
== in6p
->sin6_scope_id
) &&
178 (IN6_IS_ADDR_UNSPECIFIED(&srv6
->sin6_addr
) ||
179 IN6_ARE_ADDR_EQUAL(&srv6
->sin6_addr
, &in6p
->sin6_addr
)))
190 * res_nameinquery(name, type, class, buf, eom)
191 * look for (name,type,class) in the query section of packet (buf,eom)
193 * buf + HFIXEDSZ <= eom
199 * paul vixie, 29may94
202 res_nameinquery(const char *name
, int type
, int class,
203 const u_char
*buf
, const u_char
*eom
)
205 const u_char
*cp
= buf
+ HFIXEDSZ
;
206 int qdcount
= ntohs(((const HEADER
*)buf
)->qdcount
);
208 while (qdcount
-- > 0) {
209 char tname
[MAXDNAME
+1];
210 int n
, ttype
, tclass
;
212 n
= dn_expand(buf
, eom
, cp
, tname
, sizeof tname
);
216 if (cp
+ 2 * INT16SZ
> eom
)
218 ttype
= ns_get16(cp
); cp
+= INT16SZ
;
219 tclass
= ns_get16(cp
); cp
+= INT16SZ
;
220 if (ttype
== type
&& tclass
== class &&
221 ns_samename(tname
, name
) == 1)
228 * res_queriesmatch(buf1, eom1, buf2, eom2)
229 * is there a 1:1 mapping of (name,type,class)
230 * in (buf1,eom1) and (buf2,eom2)?
233 * 0 : not a 1:1 mapping
234 * >0 : is a 1:1 mapping
236 * paul vixie, 29may94
239 res_queriesmatch(const u_char
*buf1
, const u_char
*eom1
,
240 const u_char
*buf2
, const u_char
*eom2
)
242 const u_char
*cp
= buf1
+ HFIXEDSZ
;
243 int qdcount
= ntohs(((const HEADER
*)buf1
)->qdcount
);
245 if (buf1
+ HFIXEDSZ
> eom1
|| buf2
+ HFIXEDSZ
> eom2
)
249 * Only header section present in replies to
250 * dynamic update packets.
252 if ((((const HEADER
*)buf1
)->opcode
== ns_o_update
) &&
253 (((const HEADER
*)buf2
)->opcode
== ns_o_update
))
256 if (qdcount
!= ntohs(((const HEADER
*)buf2
)->qdcount
))
258 while (qdcount
-- > 0) {
259 char tname
[MAXDNAME
+1];
260 int n
, ttype
, tclass
;
262 n
= dn_expand(buf1
, eom1
, cp
, tname
, sizeof tname
);
266 if (cp
+ 2 * INT16SZ
> eom1
)
268 ttype
= ns_get16(cp
); cp
+= INT16SZ
;
269 tclass
= ns_get16(cp
); cp
+= INT16SZ
;
270 if (!res_nameinquery(tname
, ttype
, tclass
, buf2
, eom2
))
277 res_nsend(res_state statp
,
278 const u_char
*buf
, int buflen
, u_char
*ans
, int anssiz
)
280 int gotsomewhere
, terrno
, try, v_circuit
, resplen
, ns
, n
;
281 char abuf
[NI_MAXHOST
];
283 if (statp
->nscount
== 0) {
287 if (anssiz
< HFIXEDSZ
) {
291 DprintQ((statp
->options
& RES_DEBUG
) || (statp
->pfcode
& RES_PRF_QUERY
),
292 (stdout
, ";; res_send()\n"), buf
, buflen
);
293 v_circuit
= (statp
->options
& RES_USEVC
) || buflen
> PACKETSZ
;
298 * If the ns_addr_list in the resolver context has changed, then
299 * invalidate our cached copy and the associated timing data.
301 if (EXT(statp
).nscount
!= 0) {
303 struct sockaddr_storage peer
;
304 ISC_SOCKLEN_T peerlen
;
306 if (EXT(statp
).nscount
!= statp
->nscount
)
309 for (ns
= 0; ns
< statp
->nscount
; ns
++) {
310 if (statp
->nsaddr_list
[ns
].sin_family
&&
311 !sock_eq((struct sockaddr
*)&statp
->nsaddr_list
[ns
],
312 (struct sockaddr
*)&EXT(statp
).ext
->nsaddrs
[ns
])) {
317 if (EXT(statp
).nssocks
[ns
] == -1)
319 peerlen
= sizeof(peer
);
320 if (getsockname(EXT(statp
).nssocks
[ns
],
321 (struct sockaddr
*)&peer
, &peerlen
) < 0) {
325 if (!sock_eq((struct sockaddr
*)&peer
,
326 get_nsaddr(statp
, ns
))) {
333 EXT(statp
).nscount
= 0;
338 * Maybe initialize our private copy of the ns_addr_list.
340 if (EXT(statp
).nscount
== 0) {
341 for (ns
= 0; ns
< statp
->nscount
; ns
++) {
342 EXT(statp
).nstimes
[ns
] = RES_MAXTIME
;
343 EXT(statp
).nssocks
[ns
] = -1;
344 if (!statp
->nsaddr_list
[ns
].sin_family
)
346 EXT(statp
).ext
->nsaddrs
[ns
].sin
=
347 statp
->nsaddr_list
[ns
];
349 EXT(statp
).nscount
= statp
->nscount
;
353 * Some resolvers want to even out the load on their nameservers.
354 * Note that RES_BLAST overrides RES_ROTATE.
356 if ((statp
->options
& RES_ROTATE
) != 0U &&
357 (statp
->options
& RES_BLAST
) == 0U) {
358 union res_sockaddr_union inu
;
359 struct sockaddr_in ina
;
360 int lastns
= statp
->nscount
- 1;
364 if (EXT(statp
).ext
!= NULL
)
365 inu
= EXT(statp
).ext
->nsaddrs
[0];
366 ina
= statp
->nsaddr_list
[0];
367 fd
= EXT(statp
).nssocks
[0];
368 nstime
= EXT(statp
).nstimes
[0];
369 for (ns
= 0; ns
< lastns
; ns
++) {
370 if (EXT(statp
).ext
!= NULL
)
371 EXT(statp
).ext
->nsaddrs
[ns
] =
372 EXT(statp
).ext
->nsaddrs
[ns
+ 1];
373 statp
->nsaddr_list
[ns
] = statp
->nsaddr_list
[ns
+ 1];
374 EXT(statp
).nssocks
[ns
] = EXT(statp
).nssocks
[ns
+ 1];
375 EXT(statp
).nstimes
[ns
] = EXT(statp
).nstimes
[ns
+ 1];
377 if (EXT(statp
).ext
!= NULL
)
378 EXT(statp
).ext
->nsaddrs
[lastns
] = inu
;
379 statp
->nsaddr_list
[lastns
] = ina
;
380 EXT(statp
).nssocks
[lastns
] = fd
;
381 EXT(statp
).nstimes
[lastns
] = nstime
;
385 * Send request, RETRY times, or until successful.
387 for (try = 0; try < statp
->retry
; try++) {
388 for (ns
= 0; ns
< statp
->nscount
; ns
++) {
389 struct sockaddr
*nsap
;
391 nsap
= get_nsaddr(statp
, ns
);
392 nsaplen
= get_salen(nsap
);
393 statp
->_flags
&= ~RES_F_LASTMASK
;
394 statp
->_flags
|= (ns
<< RES_F_LASTSHIFT
);
397 int done
= 0, loops
= 0;
402 act
= (*statp
->qhook
)(&nsap
, &buf
, &buflen
,
403 ans
, anssiz
, &resplen
);
414 /* give the hook another try */
415 if (++loops
< 42) /*doug adams*/
426 Dprint(((statp
->options
& RES_DEBUG
) &&
427 getnameinfo(nsap
, nsaplen
, abuf
, sizeof(abuf
),
428 NULL
, 0, niflags
) == 0),
429 (stdout
, ";; Querying server (# %d) address = %s\n",
434 /* Use VC; at most one attempt per server. */
436 n
= send_vc(statp
, buf
, buflen
, ans
, anssiz
, &terrno
,
445 n
= send_dg(statp
, buf
, buflen
, ans
, anssiz
, &terrno
,
446 ns
, &v_circuit
, &gotsomewhere
);
456 Dprint((statp
->options
& RES_DEBUG
) ||
457 ((statp
->pfcode
& RES_PRF_REPLY
) &&
458 (statp
->pfcode
& RES_PRF_HEAD1
)),
459 (stdout
, ";; got answer:\n"));
461 DprintQ((statp
->options
& RES_DEBUG
) ||
462 (statp
->pfcode
& RES_PRF_REPLY
),
464 ans
, (resplen
> anssiz
) ? anssiz
: resplen
);
467 * If we have temporarily opened a virtual circuit,
468 * or if we haven't been asked to keep a socket open,
471 if ((v_circuit
&& (statp
->options
& RES_USEVC
) == 0U) ||
472 (statp
->options
& RES_STAYOPEN
) == 0U) {
476 int done
= 0, loops
= 0;
481 act
= (*statp
->rhook
)(nsap
, buf
, buflen
,
482 ans
, anssiz
, &resplen
);
492 /* give the hook another try */
493 if (++loops
< 42) /*doug adams*/
511 errno
= ECONNREFUSED
; /* no nameservers found */
513 errno
= ETIMEDOUT
; /* no answer obtained */
526 const struct sockaddr
*sa
;
530 /* There are people do not set sa_len. Be forgiving to them. */
535 if (sa
->sa_family
== AF_INET
)
536 return (sizeof(struct sockaddr_in
));
537 else if (sa
->sa_family
== AF_INET6
)
538 return (sizeof(struct sockaddr_in6
));
540 return (0); /* unknown, die on connect */
544 * pick appropriate nsaddr_list for use. see res_init() for initialization.
546 static struct sockaddr
*
552 if (!statp
->nsaddr_list
[n
].sin_family
&& EXT(statp
).ext
) {
554 * - EXT(statp).ext->nsaddrs[n] holds an address that is larger
555 * than struct sockaddr, and
556 * - user code did not update statp->nsaddr_list[n].
558 return (struct sockaddr
*)(void *)&EXT(statp
).ext
->nsaddrs
[n
];
561 * - user code updated statp->nsaddr_list[n], or
562 * - statp->nsaddr_list[n] has the same content as
563 * EXT(statp).ext->nsaddrs[n].
565 return (struct sockaddr
*)(void *)&statp
->nsaddr_list
[n
];
570 send_vc(res_state statp
,
571 const u_char
*buf
, int buflen
, u_char
*ans
, int anssiz
,
574 const HEADER
*hp
= (const HEADER
*) buf
;
575 HEADER
*anhp
= (HEADER
*) ans
;
576 struct sockaddr
*nsap
;
578 int truncating
, connreset
, resplen
, n
;
584 nsap
= get_nsaddr(statp
, ns
);
585 nsaplen
= get_salen(nsap
);
591 /* Are we still talking to whom we want to talk to? */
592 if (statp
->_vcsock
>= 0 && (statp
->_flags
& RES_F_VC
) != 0) {
593 struct sockaddr_storage peer
;
594 ISC_SOCKLEN_T size
= sizeof peer
;
596 if (getpeername(statp
->_vcsock
,
597 (struct sockaddr
*)&peer
, &size
) < 0 ||
598 !sock_eq((struct sockaddr
*)&peer
, nsap
)) {
600 statp
->_flags
&= ~RES_F_VC
;
604 if (statp
->_vcsock
< 0 || (statp
->_flags
& RES_F_VC
) == 0) {
605 if (statp
->_vcsock
>= 0)
608 statp
->_vcsock
= socket(nsap
->sa_family
, SOCK_STREAM
, 0);
609 if (statp
->_vcsock
> highestFD
) {
613 if (statp
->_vcsock
< 0) {
615 case EPROTONOSUPPORT
:
620 Perror(statp
, stderr
, "socket(vc)", errno
);
624 Perror(statp
, stderr
, "socket(vc)", errno
);
629 if (connect(statp
->_vcsock
, nsap
, nsaplen
) < 0) {
631 Aerror(statp
, stderr
, "connect/vc", errno
, nsap
,
636 statp
->_flags
|= RES_F_VC
;
640 * Send length & message
642 ns_put16((u_short
)buflen
, (u_char
*)&len
);
643 iov
[0] = evConsIovec(&len
, INT16SZ
);
645 iov
[1] = evConsIovec(tmp
, buflen
);
646 if (writev(statp
->_vcsock
, iov
, 2) != (INT16SZ
+ buflen
)) {
648 Perror(statp
, stderr
, "write failed", errno
);
653 * Receive length & response
658 while ((n
= read(statp
->_vcsock
, (char *)cp
, (int)len
)) > 0) {
665 Perror(statp
, stderr
, "read failed", errno
);
668 * A long running process might get its TCP
669 * connection reset if the remote server was
670 * restarted. Requery the server instead of
671 * trying a new one. When there is only one
672 * server, this means that a query might work
673 * instead of failing. We only allow one reset
674 * per query to prevent looping.
676 if (*terrno
== ECONNRESET
&& !connreset
) {
684 resplen
= ns_get16(ans
);
685 if (resplen
> anssiz
) {
686 Dprint(statp
->options
& RES_DEBUG
,
687 (stdout
, ";; response truncated\n")
693 if (len
< HFIXEDSZ
) {
695 * Undersized message.
697 Dprint(statp
->options
& RES_DEBUG
,
698 (stdout
, ";; undersized: %d\n", len
));
704 while (len
!= 0 && (n
= read(statp
->_vcsock
, (char *)cp
, (int)len
)) > 0){
710 Perror(statp
, stderr
, "read(vc)", errno
);
716 * Flush rest of answer so connection stays in synch.
719 len
= resplen
- anssiz
;
723 n
= read(statp
->_vcsock
, junk
,
724 (len
> sizeof junk
) ? sizeof junk
: len
);
732 * If the calling applicating has bailed out of
733 * a previous call and failed to arrange to have
734 * the circuit closed or the server has got
735 * itself confused, then drop the packet and
736 * wait for the correct one.
738 if (hp
->id
!= anhp
->id
) {
739 DprintQ((statp
->options
& RES_DEBUG
) ||
740 (statp
->pfcode
& RES_PRF_REPLY
),
741 (stdout
, ";; old answer (unexpected):\n"),
742 ans
, (resplen
> anssiz
) ? anssiz
: resplen
);
747 * All is well, or the error is fatal. Signal that the
748 * next nameserver ought not be tried.
754 send_dg(res_state statp
,
755 const u_char
*buf
, int buflen
, u_char
*ans
, int anssiz
,
756 int *terrno
, int ns
, int *v_circuit
, int *gotsomewhere
)
758 const HEADER
*hp
= (const HEADER
*) buf
;
759 HEADER
*anhp
= (HEADER
*) ans
;
760 const struct sockaddr
*nsap
;
762 struct timespec now
, timeout
, finish
;
764 struct sockaddr_storage from
;
765 ISC_SOCKLEN_T fromlen
;
766 int resplen
, seconds
, n
, s
;
768 nsap
= get_nsaddr(statp
, ns
);
769 nsaplen
= get_salen(nsap
);
770 if (EXT(statp
).nssocks
[ns
] == -1) {
771 EXT(statp
).nssocks
[ns
] = socket(nsap
->sa_family
, SOCK_DGRAM
, 0);
772 if (EXT(statp
).nssocks
[ns
] > highestFD
) {
776 if (EXT(statp
).nssocks
[ns
] < 0) {
778 case EPROTONOSUPPORT
:
783 Perror(statp
, stderr
, "socket(dg)", errno
);
787 Perror(statp
, stderr
, "socket(dg)", errno
);
791 #ifndef CANNOT_CONNECT_DGRAM
793 * On a 4.3BSD+ machine (client and server,
794 * actually), sending to a nameserver datagram
795 * port with no nameserver will cause an
796 * ICMP port unreachable message to be returned.
797 * If our datagram socket is "connected" to the
798 * server, we get an ECONNREFUSED error on the next
799 * socket operation, and select returns if the
800 * error message is received. We can thus detect
801 * the absence of a nameserver without timing out.
803 if (connect(EXT(statp
).nssocks
[ns
], nsap
, nsaplen
) < 0) {
804 Aerror(statp
, stderr
, "connect(dg)", errno
, nsap
,
809 #endif /* !CANNOT_CONNECT_DGRAM */
810 Dprint(statp
->options
& RES_DEBUG
,
811 (stdout
, ";; new DG socket\n"))
813 s
= EXT(statp
).nssocks
[ns
];
814 #ifndef CANNOT_CONNECT_DGRAM
815 if (send(s
, (const char*)buf
, buflen
, 0) != buflen
) {
816 Perror(statp
, stderr
, "send", errno
);
820 #else /* !CANNOT_CONNECT_DGRAM */
821 if (sendto(s
, (const char*)buf
, buflen
, 0, nsap
, nsaplen
) != buflen
)
823 Aerror(statp
, stderr
, "sendto", errno
, nsap
, nsaplen
);
827 #endif /* !CANNOT_CONNECT_DGRAM */
832 seconds
= (statp
->retrans
<< ns
);
834 seconds
/= statp
->nscount
;
838 timeout
= evConsTime(seconds
, 0);
839 finish
= evAddTime(now
, timeout
);
846 if (evCmpTime(finish
, now
) > 0)
847 timeout
= evSubTime(finish
, now
);
849 timeout
= evConsTime(0, 0);
850 n
= pselect(s
+ 1, &dsmask
, NULL
, NULL
, &timeout
, NULL
);
852 Dprint(statp
->options
& RES_DEBUG
, (stdout
, ";; timeout\n"));
859 Perror(statp
, stderr
, "select", errno
);
864 fromlen
= sizeof(from
);
865 resplen
= recvfrom(s
, (char*)ans
, anssiz
,0,
866 (struct sockaddr
*)&from
, &fromlen
);
868 Perror(statp
, stderr
, "recvfrom", errno
);
873 if (resplen
< HFIXEDSZ
) {
875 * Undersized message.
877 Dprint(statp
->options
& RES_DEBUG
,
878 (stdout
, ";; undersized: %d\n",
884 if (hp
->id
!= anhp
->id
) {
886 * response from old query, ignore it.
887 * XXX - potential security hazard could
890 DprintQ((statp
->options
& RES_DEBUG
) ||
891 (statp
->pfcode
& RES_PRF_REPLY
),
892 (stdout
, ";; old answer:\n"),
893 ans
, (resplen
> anssiz
) ? anssiz
: resplen
);
896 if (!(statp
->options
& RES_INSECURE1
) &&
897 !res_ourserver_p(statp
, (struct sockaddr
*)&from
)) {
899 * response from wrong server? ignore it.
900 * XXX - potential security hazard could
903 DprintQ((statp
->options
& RES_DEBUG
) ||
904 (statp
->pfcode
& RES_PRF_REPLY
),
905 (stdout
, ";; not our server:\n"),
906 ans
, (resplen
> anssiz
) ? anssiz
: resplen
);
910 if (anhp
->rcode
== FORMERR
&& (statp
->options
& RES_USE_EDNS0
) != 0U) {
912 * Do not retry if the server do not understand EDNS0.
913 * The case has to be captured here, as FORMERR packet do not
914 * carry query section, hence res_queriesmatch() returns 0.
916 DprintQ(statp
->options
& RES_DEBUG
,
917 (stdout
, "server rejected query with EDNS0:\n"),
918 ans
, (resplen
> anssiz
) ? anssiz
: resplen
);
919 /* record the error */
920 statp
->_flags
|= RES_F_EDNS0ERR
;
925 if (!(statp
->options
& RES_INSECURE2
) &&
926 !res_queriesmatch(buf
, buf
+ buflen
,
927 ans
, ans
+ anssiz
)) {
929 * response contains wrong query? ignore it.
930 * XXX - potential security hazard could
933 DprintQ((statp
->options
& RES_DEBUG
) ||
934 (statp
->pfcode
& RES_PRF_REPLY
),
935 (stdout
, ";; wrong query name:\n"),
936 ans
, (resplen
> anssiz
) ? anssiz
: resplen
);
939 if (anhp
->rcode
== SERVFAIL
||
940 anhp
->rcode
== NOTIMP
||
941 anhp
->rcode
== REFUSED
) {
942 DprintQ(statp
->options
& RES_DEBUG
,
943 (stdout
, "server rejected query:\n"),
944 ans
, (resplen
> anssiz
) ? anssiz
: resplen
);
946 /* don't retry if called from dig */
950 if (!(statp
->options
& RES_IGNTC
) && anhp
->tc
) {
952 * To get the rest of answer,
953 * use TCP with same server.
955 Dprint(statp
->options
& RES_DEBUG
,
956 (stdout
, ";; truncated answer\n"));
962 * All is well, or the error is fatal. Signal that the
963 * next nameserver ought not be tried.
969 Aerror(const res_state statp
, FILE *file
, const char *string
, int error
,
970 const struct sockaddr
*address
, int alen
)
973 char hbuf
[NI_MAXHOST
];
974 char sbuf
[NI_MAXSERV
];
978 if ((statp
->options
& RES_DEBUG
) != 0U) {
979 if (getnameinfo(address
, alen
, hbuf
, sizeof(hbuf
),
980 sbuf
, sizeof(sbuf
), niflags
)) {
981 strncpy(hbuf
, "?", sizeof(hbuf
) - 1);
982 hbuf
[sizeof(hbuf
) - 1] = '\0';
983 strncpy(sbuf
, "?", sizeof(sbuf
) - 1);
984 sbuf
[sizeof(sbuf
) - 1] = '\0';
986 fprintf(file
, "res_send: %s ([%s].%s): %s\n",
987 string
, hbuf
, sbuf
, strerror(error
));
993 Perror(const res_state statp
, FILE *file
, const char *string
, int error
) {
996 if ((statp
->options
& RES_DEBUG
) != 0U)
997 fprintf(file
, "res_send: %s: %s\n",
998 string
, strerror(error
));
1003 sock_eq(struct sockaddr
*a
, struct sockaddr
*b
) {
1004 struct sockaddr_in
*a4
, *b4
;
1005 struct sockaddr_in6
*a6
, *b6
;
1007 if (a
->sa_family
!= b
->sa_family
)
1009 switch (a
->sa_family
) {
1011 a4
= (struct sockaddr_in
*)a
;
1012 b4
= (struct sockaddr_in
*)b
;
1013 return a4
->sin_port
== b4
->sin_port
&&
1014 a4
->sin_addr
.s_addr
== b4
->sin_addr
.s_addr
;
1016 a6
= (struct sockaddr_in6
*)a
;
1017 b6
= (struct sockaddr_in6
*)b
;
1018 return a6
->sin6_port
== b6
->sin6_port
&&
1019 #ifdef HAVE_SIN6_SCOPE_ID
1020 a6
->sin6_scope_id
== b6
->sin6_scope_id
&&
1022 IN6_ARE_ADDR_EQUAL(&a6
->sin6_addr
, &b6
->sin6_addr
);
1029 /* XXX needs to move to the porting library. */
1031 pselect(int nfds
, void *rfds
, void *wfds
, void *efds
,
1032 struct timespec
*tsp
, const sigset_t
*sigmask
)
1034 struct timeval tv
, *tvp
;
1040 tv
= evTimeVal(*tsp
);
1044 sigprocmask(SIG_SETMASK
, sigmask
, &sigs
);
1045 n
= select(nfds
, rfds
, wfds
, efds
, tvp
);
1047 sigprocmask(SIG_SETMASK
, &sigs
, NULL
);
1049 *tsp
= evTimeSpec(tv
);