michael@0: /*	$NetBSD: res_send.c,v 1.9 2006/01/24 17:41:25 christos Exp $	*/
michael@0: 
michael@0: /*
michael@0:  * Copyright 2008  Android Open Source Project (source port randomization)
michael@0:  * Copyright (c) 1985, 1989, 1993
michael@0:  *    The Regents of the University of California.  All rights reserved.
michael@0:  *
michael@0:  * Redistribution and use in source and binary forms, with or without
michael@0:  * modification, are permitted provided that the following conditions
michael@0:  * are met:
michael@0:  * 1. Redistributions of source code must retain the above copyright
michael@0:  *    notice, this list of conditions and the following disclaimer.
michael@0:  * 2. Redistributions in binary form must reproduce the above copyright
michael@0:  *    notice, this list of conditions and the following disclaimer in the
michael@0:  *    documentation and/or other materials provided with the distribution.
michael@0:  * 3. All advertising materials mentioning features or use of this software
michael@0:  *    must display the following acknowledgement:
michael@0:  * 	This product includes software developed by the University of
michael@0:  * 	California, Berkeley and its contributors.
michael@0:  * 4. Neither the name of the University nor the names of its contributors
michael@0:  *    may be used to endorse or promote products derived from this software
michael@0:  *    without specific prior written permission.
michael@0:  *
michael@0:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
michael@0:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
michael@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
michael@0:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
michael@0:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
michael@0:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
michael@0:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
michael@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
michael@0:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
michael@0:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
michael@0:  * SUCH DAMAGE.
michael@0:  */
michael@0: 
michael@0: /*
michael@0:  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
michael@0:  *
michael@0:  * Permission to use, copy, modify, and distribute this software for any
michael@0:  * purpose with or without fee is hereby granted, provided that the above
michael@0:  * copyright notice and this permission notice appear in all copies, and that
michael@0:  * the name of Digital Equipment Corporation not be used in advertising or
michael@0:  * publicity pertaining to distribution of the document or software without
michael@0:  * specific, written prior permission.
michael@0:  *
michael@0:  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
michael@0:  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
michael@0:  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
michael@0:  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
michael@0:  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
michael@0:  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
michael@0:  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
michael@0:  * SOFTWARE.
michael@0:  */
michael@0: 
michael@0: /*
michael@0:  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
michael@0:  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
michael@0:  *
michael@0:  * Permission to use, copy, modify, and distribute this software for any
michael@0:  * purpose with or without fee is hereby granted, provided that the above
michael@0:  * copyright notice and this permission notice appear in all copies.
michael@0:  *
michael@0:  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
michael@0:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
michael@0:  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
michael@0:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
michael@0:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
michael@0:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
michael@0:  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
michael@0:  */
michael@0: 
michael@0: /*
michael@0:  * This version of this file is derived from Android 2.3 "Gingerbread",
michael@0:  * which contains uncredited changes by Android/Google developers.  It has
michael@0:  * been modified in 2011 for use in the Android build of Mozilla Firefox by
michael@0:  * Mozilla contributors (including Michael Edwards <m.k.edwards@gmail.com>,
michael@0:  * and Steve Workman <sjhworkman@gmail.com>).
michael@0:  * These changes are offered under the same license as the original NetBSD
michael@0:  * file, whose copyright and license are unchanged above.
michael@0:  */
michael@0: 
michael@0: #define ANDROID_CHANGES 1
michael@0: #define MOZILLA_NECKO_EXCLUDE_CODE 1 
michael@0: 
michael@0: #include <sys/cdefs.h>
michael@0: #if defined(LIBC_SCCS) && !defined(lint)
michael@0: #ifdef notdef
michael@0: static const char sccsid[] = "@(#)res_send.c	8.1 (Berkeley) 6/4/93";
michael@0: static const char rcsid[] = "Id: res_send.c,v 1.5.2.2.4.5 2004/08/10 02:19:56 marka Exp";
michael@0: #else
michael@0: __RCSID("$NetBSD: res_send.c,v 1.9 2006/01/24 17:41:25 christos Exp $");
michael@0: #endif
michael@0: #endif /* LIBC_SCCS and not lint */
michael@0: 
michael@0: /* Set to 0 to not use the small/simple/limited DNS cache
michael@0:  * Cache implemented higher up in Gecko */
michael@0: #define  USE_RESOLV_CACHE  0
michael@0: 
michael@0: /*
michael@0:  * Send query to name server and wait for reply.
michael@0:  */
michael@0: 
michael@0: #include <sys/types.h>
michael@0: #include <sys/param.h>
michael@0: #include <sys/time.h>
michael@0: #include <sys/socket.h>
michael@0: #include <sys/uio.h>
michael@0: 
michael@0: #include <netinet/in.h>
michael@0: #include "arpa_nameser.h"
michael@0: #include <arpa/inet.h>
michael@0: 
michael@0: #include <errno.h>
michael@0: #include <netdb.h>
michael@0: #ifdef ANDROID_CHANGES
michael@0: #include "resolv_private.h"
michael@0: #else
michael@0: #include <resolv.h>
michael@0: #endif
michael@0: #include <signal.h>
michael@0: #include <stdio.h>
michael@0: #include <stdlib.h>
michael@0: #include <string.h>
michael@0: #include <unistd.h>
michael@0: 
michael@0: #include "eventlib.h"
michael@0: 
michael@0: #if USE_RESOLV_CACHE
michael@0: #  include <resolv_cache.h>
michael@0: #endif
michael@0: 
michael@0: #ifndef DE_CONST
michael@0: #define DE_CONST(c,v)   v = ((c) ? \
michael@0:     strchr((const void *)(c), *(const char *)(const void *)(c)) : NULL)
michael@0: #endif
michael@0: 
michael@0: /* Options.  Leave them on. */
michael@0: #ifndef DEBUG
michael@0: #define DEBUG
michael@0: #endif
michael@0: #include "res_debug.h"
michael@0: #include "res_private.h"
michael@0: 
michael@0: #define EXT(res) ((res)->_u._ext)
michael@0: 
michael@0: static const int highestFD = FD_SETSIZE - 1;
michael@0: 
michael@0: /* Forward. */
michael@0: 
michael@0: static int		get_salen __P((const struct sockaddr *));
michael@0: static struct sockaddr * get_nsaddr __P((res_state, size_t));
michael@0: static int		send_vc(res_state, const u_char *, int,
michael@0: 				u_char *, int, int *, int);
michael@0: static int		send_dg(res_state, const u_char *, int,
michael@0: 				u_char *, int, int *, int,
michael@0: 				int *, int *);
michael@0: static void		Aerror(const res_state, FILE *, const char *, int,
michael@0: 			       const struct sockaddr *, int);
michael@0: static void		Perror(const res_state, FILE *, const char *, int);
michael@0: static int		sock_eq(struct sockaddr *, struct sockaddr *);
michael@0: #ifdef NEED_PSELECT
michael@0: static int		pselect(int, void *, void *, void *,
michael@0: 				struct timespec *,
michael@0: 				const sigset_t *);
michael@0: #endif
michael@0: void res_pquery(const res_state, const u_char *, int, FILE *);
michael@0: 
michael@0: 
michael@0: /* BIONIC-BEGIN: implement source port randomization */
michael@0: typedef union {
michael@0:     struct sockaddr      sa;
michael@0:     struct sockaddr_in   sin;
michael@0:     struct sockaddr_in6  sin6;
michael@0: } _sockaddr_union;
michael@0: 
michael@0: static int
michael@0: random_bind( int  s, int  family )
michael@0: {
michael@0:     _sockaddr_union  u;
michael@0:     int              j;
michael@0:     socklen_t        slen;
michael@0: 
michael@0:     /* clear all, this also sets the IP4/6 address to 'any' */
michael@0:     memset( &u, 0, sizeof u );
michael@0: 
michael@0:     switch (family) {
michael@0:         case AF_INET:
michael@0:             u.sin.sin_family = family;
michael@0:             slen             = sizeof u.sin;
michael@0:             break;
michael@0:         case AF_INET6:
michael@0:             u.sin6.sin6_family = family;
michael@0:             slen               = sizeof u.sin6;
michael@0:             break;
michael@0:         default:
michael@0:             errno = EPROTO;
michael@0:             return -1;
michael@0:     }
michael@0: 
michael@0:     /* first try to bind to a random source port a few times */
michael@0:     for (j = 0; j < 10; j++) {
michael@0:         /* find a random port between 1025 .. 65534 */
michael@0:         int  port = 1025 + (res_randomid() % (65535-1025));
michael@0:         if (family == AF_INET)
michael@0:             u.sin.sin_port = htons(port);
michael@0:         else
michael@0:             u.sin6.sin6_port = htons(port);
michael@0: 
michael@0:         if ( !bind( s, &u.sa, slen ) )
michael@0:             return 0;
michael@0:     }
michael@0: 
michael@0:     /* nothing after 10 tries, our network table is probably busy */
michael@0:     /* let the system decide which port is best */
michael@0:     if (family == AF_INET)
michael@0:         u.sin.sin_port = 0;
michael@0:     else
michael@0:         u.sin6.sin6_port = 0;
michael@0: 
michael@0:     return bind( s, &u.sa, slen );
michael@0: }
michael@0: /* BIONIC-END */
michael@0: 
michael@0: static const int niflags = NI_NUMERICHOST | NI_NUMERICSERV;
michael@0: 
michael@0: /* Public. */
michael@0: 
michael@0: /* int
michael@0:  * res_isourserver(ina)
michael@0:  *	looks up "ina" in _res.ns_addr_list[]
michael@0:  * returns:
michael@0:  *	0  : not found
michael@0:  *	>0 : found
michael@0:  * author:
michael@0:  *	paul vixie, 29may94
michael@0:  */
michael@0: int
michael@0: res_ourserver_p(const res_state statp, const struct sockaddr *sa) {
michael@0: 	const struct sockaddr_in *inp, *srv;
michael@0: 	const struct sockaddr_in6 *in6p, *srv6;
michael@0: 	int ns;
michael@0: 
michael@0: 	switch (sa->sa_family) {
michael@0: 	case AF_INET:
michael@0: 		inp = (const struct sockaddr_in *)(const void *)sa;
michael@0: 		for (ns = 0;  ns < statp->nscount;  ns++) {
michael@0: 			srv = (struct sockaddr_in *)(void *)get_nsaddr(statp, (size_t)ns);
michael@0: 			if (srv->sin_family == inp->sin_family &&
michael@0: 			    srv->sin_port == inp->sin_port &&
michael@0: 			    (srv->sin_addr.s_addr == INADDR_ANY ||
michael@0: 			     srv->sin_addr.s_addr == inp->sin_addr.s_addr))
michael@0: 				return (1);
michael@0: 		}
michael@0: 		break;
michael@0: 	case AF_INET6:
michael@0: 		if (EXT(statp).ext == NULL)
michael@0: 			break;
michael@0: 		in6p = (const struct sockaddr_in6 *)(const void *)sa;
michael@0: 		for (ns = 0;  ns < statp->nscount;  ns++) {
michael@0: 			srv6 = (struct sockaddr_in6 *)(void *)get_nsaddr(statp, (size_t)ns);
michael@0: 			if (srv6->sin6_family == in6p->sin6_family &&
michael@0: 			    srv6->sin6_port == in6p->sin6_port &&
michael@0: #ifdef HAVE_SIN6_SCOPE_ID
michael@0: 			    (srv6->sin6_scope_id == 0 ||
michael@0: 			     srv6->sin6_scope_id == in6p->sin6_scope_id) &&
michael@0: #endif
michael@0: 			    (IN6_IS_ADDR_UNSPECIFIED(&srv6->sin6_addr) ||
michael@0: 			     IN6_ARE_ADDR_EQUAL(&srv6->sin6_addr, &in6p->sin6_addr)))
michael@0: 				return (1);
michael@0: 		}
michael@0: 		break;
michael@0: 	default:
michael@0: 		break;
michael@0: 	}
michael@0: 	return (0);
michael@0: }
michael@0: 
michael@0: /* int
michael@0:  * res_nameinquery(name, type, class, buf, eom)
michael@0:  *	look for (name,type,class) in the query section of packet (buf,eom)
michael@0:  * requires:
michael@0:  *	buf + HFIXEDSZ <= eom
michael@0:  * returns:
michael@0:  *	-1 : format error
michael@0:  *	0  : not found
michael@0:  *	>0 : found
michael@0:  * author:
michael@0:  *	paul vixie, 29may94
michael@0:  */
michael@0: int
michael@0: res_nameinquery(const char *name, int type, int class,
michael@0: 		const u_char *buf, const u_char *eom)
michael@0: {
michael@0: 	const u_char *cp = buf + HFIXEDSZ;
michael@0: 	int qdcount = ntohs(((const HEADER*)(const void *)buf)->qdcount);
michael@0: 
michael@0: 	while (qdcount-- > 0) {
michael@0: 		char tname[MAXDNAME+1];
michael@0: 		int n, ttype, tclass;
michael@0: 
michael@0: 		n = dn_expand(buf, eom, cp, tname, sizeof tname);
michael@0: 		if (n < 0)
michael@0: 			return (-1);
michael@0: 		cp += n;
michael@0: 		if (cp + 2 * INT16SZ > eom)
michael@0: 			return (-1);
michael@0: 		ttype = ns_get16(cp); cp += INT16SZ;
michael@0: 		tclass = ns_get16(cp); cp += INT16SZ;
michael@0: 		if (ttype == type && tclass == class &&
michael@0: 		    ns_samename(tname, name) == 1)
michael@0: 			return (1);
michael@0: 	}
michael@0: 	return (0);
michael@0: }
michael@0: 
michael@0: /* int
michael@0:  * res_queriesmatch(buf1, eom1, buf2, eom2)
michael@0:  *	is there a 1:1 mapping of (name,type,class)
michael@0:  *	in (buf1,eom1) and (buf2,eom2)?
michael@0:  * returns:
michael@0:  *	-1 : format error
michael@0:  *	0  : not a 1:1 mapping
michael@0:  *	>0 : is a 1:1 mapping
michael@0:  * author:
michael@0:  *	paul vixie, 29may94
michael@0:  */
michael@0: int
michael@0: res_queriesmatch(const u_char *buf1, const u_char *eom1,
michael@0: 		 const u_char *buf2, const u_char *eom2)
michael@0: {
michael@0: 	const u_char *cp = buf1 + HFIXEDSZ;
michael@0: 	int qdcount = ntohs(((const HEADER*)(const void *)buf1)->qdcount);
michael@0: 
michael@0: 	if (buf1 + HFIXEDSZ > eom1 || buf2 + HFIXEDSZ > eom2)
michael@0: 		return (-1);
michael@0: 
michael@0: 	/*
michael@0: 	 * Only header section present in replies to
michael@0: 	 * dynamic update packets.
michael@0: 	 */
michael@0: 	if ((((const HEADER *)(const void *)buf1)->opcode == ns_o_update) &&
michael@0: 	    (((const HEADER *)(const void *)buf2)->opcode == ns_o_update))
michael@0: 		return (1);
michael@0: 
michael@0: 	if (qdcount != ntohs(((const HEADER*)(const void *)buf2)->qdcount))
michael@0: 		return (0);
michael@0: 	while (qdcount-- > 0) {
michael@0: 		char tname[MAXDNAME+1];
michael@0: 		int n, ttype, tclass;
michael@0: 
michael@0: 		n = dn_expand(buf1, eom1, cp, tname, sizeof tname);
michael@0: 		if (n < 0)
michael@0: 			return (-1);
michael@0: 		cp += n;
michael@0: 		if (cp + 2 * INT16SZ > eom1)
michael@0: 			return (-1);
michael@0: 		ttype = ns_get16(cp);	cp += INT16SZ;
michael@0: 		tclass = ns_get16(cp); cp += INT16SZ;
michael@0: 		if (!res_nameinquery(tname, ttype, tclass, buf2, eom2))
michael@0: 			return (0);
michael@0: 	}
michael@0: 	return (1);
michael@0: }
michael@0: 
michael@0: 
michael@0: int
michael@0: res_nsend(res_state statp,
michael@0: 	  const u_char *buf, int buflen, u_char *ans, int anssiz)
michael@0: {
michael@0: 	int gotsomewhere, terrno, try, v_circuit, resplen, ns, n;
michael@0: 	char abuf[NI_MAXHOST];
michael@0: #if USE_RESOLV_CACHE
michael@0:         struct resolv_cache*  cache;
michael@0:         ResolvCacheStatus     cache_status = RESOLV_CACHE_UNSUPPORTED;
michael@0: #endif
michael@0: 
michael@0: 	if (statp->nscount == 0) {
michael@0: 		errno = ESRCH;
michael@0: 		return (-1);
michael@0: 	}
michael@0: 	if (anssiz < HFIXEDSZ) {
michael@0: 		errno = EINVAL;
michael@0: 		return (-1);
michael@0: 	}
michael@0: 	DprintQ((statp->options & RES_DEBUG) || (statp->pfcode & RES_PRF_QUERY),
michael@0: 		(stdout, ";; res_send()\n"), buf, buflen);
michael@0: 	v_circuit = (statp->options & RES_USEVC) || buflen > PACKETSZ;
michael@0: 	gotsomewhere = 0;
michael@0: 	terrno = ETIMEDOUT;
michael@0: 
michael@0: #if USE_RESOLV_CACHE
michael@0:         cache = __get_res_cache();
michael@0:         if (cache != NULL) {
michael@0:             int  anslen = 0;
michael@0:             cache_status = _resolv_cache_lookup(
michael@0:                                 cache, buf, buflen,
michael@0:                                 ans, anssiz, &anslen);
michael@0: 
michael@0:             if (cache_status == RESOLV_CACHE_FOUND) {
michael@0:                 return anslen;
michael@0:             }
michael@0:         }
michael@0: #endif
michael@0: 
michael@0: 	/*
michael@0: 	 * If the ns_addr_list in the resolver context has changed, then
michael@0: 	 * invalidate our cached copy and the associated timing data.
michael@0: 	 */
michael@0: 	if (EXT(statp).nscount != 0) {
michael@0: 		int needclose = 0;
michael@0: 		struct sockaddr_storage peer;
michael@0: 		socklen_t peerlen;
michael@0: 
michael@0: 		if (EXT(statp).nscount != statp->nscount)
michael@0: 			needclose++;
michael@0: 		else
michael@0: 			for (ns = 0; ns < statp->nscount; ns++) {
michael@0: 				if (statp->nsaddr_list[ns].sin_family &&
michael@0: 				    !sock_eq((struct sockaddr *)(void *)&statp->nsaddr_list[ns],
michael@0: 					     (struct sockaddr *)(void *)&EXT(statp).ext->nsaddrs[ns])) {
michael@0: 					needclose++;
michael@0: 					break;
michael@0: 				}
michael@0: 
michael@0: 				if (EXT(statp).nssocks[ns] == -1)
michael@0: 					continue;
michael@0: 				peerlen = sizeof(peer);
michael@0: 				if (getsockname(EXT(statp).nssocks[ns],
michael@0: 				    (struct sockaddr *)(void *)&peer, &peerlen) < 0) {
michael@0: 					needclose++;
michael@0: 					break;
michael@0: 				}
michael@0: 				if (!sock_eq((struct sockaddr *)(void *)&peer,
michael@0: 				    get_nsaddr(statp, (size_t)ns))) {
michael@0: 					needclose++;
michael@0: 					break;
michael@0: 				}
michael@0: 			}
michael@0: 		if (needclose) {
michael@0: 			res_nclose(statp);
michael@0: 			EXT(statp).nscount = 0;
michael@0: 		}
michael@0: 	}
michael@0: 
michael@0: 	/*
michael@0: 	 * Maybe initialize our private copy of the ns_addr_list.
michael@0: 	 */
michael@0: 	if (EXT(statp).nscount == 0) {
michael@0: 		for (ns = 0; ns < statp->nscount; ns++) {
michael@0: 			EXT(statp).nstimes[ns] = RES_MAXTIME;
michael@0: 			EXT(statp).nssocks[ns] = -1;
michael@0: 			if (!statp->nsaddr_list[ns].sin_family)
michael@0: 				continue;
michael@0: 			EXT(statp).ext->nsaddrs[ns].sin =
michael@0: 				 statp->nsaddr_list[ns];
michael@0: 		}
michael@0: 		EXT(statp).nscount = statp->nscount;
michael@0: 	}
michael@0: 
michael@0: 	/*
michael@0: 	 * Some resolvers want to even out the load on their nameservers.
michael@0: 	 * Note that RES_BLAST overrides RES_ROTATE.
michael@0: 	 */
michael@0: 	if ((statp->options & RES_ROTATE) != 0U &&
michael@0: 	    (statp->options & RES_BLAST) == 0U) {
michael@0: 		union res_sockaddr_union inu;
michael@0: 		struct sockaddr_in ina;
michael@0: 		int lastns = statp->nscount - 1;
michael@0: 		int fd;
michael@0: 		u_int16_t nstime;
michael@0: 
michael@0: 		if (EXT(statp).ext != NULL)
michael@0: 			inu = EXT(statp).ext->nsaddrs[0];
michael@0: 		ina = statp->nsaddr_list[0];
michael@0: 		fd = EXT(statp).nssocks[0];
michael@0: 		nstime = EXT(statp).nstimes[0];
michael@0: 		for (ns = 0; ns < lastns; ns++) {
michael@0: 			if (EXT(statp).ext != NULL)
michael@0:                                 EXT(statp).ext->nsaddrs[ns] =
michael@0: 					EXT(statp).ext->nsaddrs[ns + 1];
michael@0: 			statp->nsaddr_list[ns] = statp->nsaddr_list[ns + 1];
michael@0: 			EXT(statp).nssocks[ns] = EXT(statp).nssocks[ns + 1];
michael@0: 			EXT(statp).nstimes[ns] = EXT(statp).nstimes[ns + 1];
michael@0: 		}
michael@0: 		if (EXT(statp).ext != NULL)
michael@0: 			EXT(statp).ext->nsaddrs[lastns] = inu;
michael@0: 		statp->nsaddr_list[lastns] = ina;
michael@0: 		EXT(statp).nssocks[lastns] = fd;
michael@0: 		EXT(statp).nstimes[lastns] = nstime;
michael@0: 	}
michael@0: 
michael@0: 	/*
michael@0: 	 * Send request, RETRY times, or until successful.
michael@0: 	 */
michael@0: 	for (try = 0; try < statp->retry; try++) {
michael@0: 	    for (ns = 0; ns < statp->nscount; ns++) {
michael@0: 		struct sockaddr *nsap;
michael@0: 		int nsaplen;
michael@0: 		nsap = get_nsaddr(statp, (size_t)ns);
michael@0: 		nsaplen = get_salen(nsap);
michael@0: 		statp->_flags &= ~RES_F_LASTMASK;
michael@0: 		statp->_flags |= (ns << RES_F_LASTSHIFT);
michael@0:  same_ns:
michael@0: 		if (statp->qhook) {
michael@0: 			int done = 0, loops = 0;
michael@0: 
michael@0: 			do {
michael@0: 				res_sendhookact act;
michael@0: 
michael@0: 				act = (*statp->qhook)(&nsap, &buf, &buflen,
michael@0: 						      ans, anssiz, &resplen);
michael@0: 				switch (act) {
michael@0: 				case res_goahead:
michael@0: 					done = 1;
michael@0: 					break;
michael@0: 				case res_nextns:
michael@0: 					res_nclose(statp);
michael@0: 					goto next_ns;
michael@0: 				case res_done:
michael@0: 					return (resplen);
michael@0: 				case res_modified:
michael@0: 					/* give the hook another try */
michael@0: 					if (++loops < 42) /*doug adams*/
michael@0: 						break;
michael@0: 					/*FALLTHROUGH*/
michael@0: 				case res_error:
michael@0: 					/*FALLTHROUGH*/
michael@0: 				default:
michael@0: 					goto fail;
michael@0: 				}
michael@0: 			} while (!done);
michael@0: 		}
michael@0: 
michael@0: 		Dprint(((statp->options & RES_DEBUG) &&
michael@0: 			getnameinfo(nsap, (socklen_t)nsaplen, abuf, sizeof(abuf),
michael@0: 				    NULL, 0, niflags) == 0),
michael@0: 		       (stdout, ";; Querying server (# %d) address = %s\n",
michael@0: 			ns + 1, abuf));
michael@0: 
michael@0: 
michael@0: 		if (v_circuit) {
michael@0: 			/* Use VC; at most one attempt per server. */
michael@0: 			try = statp->retry;
michael@0: 			n = send_vc(statp, buf, buflen, ans, anssiz, &terrno,
michael@0: 				    ns);
michael@0: 			if (n < 0)
michael@0: 				goto fail;
michael@0: 			if (n == 0)
michael@0: 				goto next_ns;
michael@0: 			resplen = n;
michael@0: 		} else {
michael@0: 			/* Use datagrams. */
michael@0: 			n = send_dg(statp, buf, buflen, ans, anssiz, &terrno,
michael@0: 				    ns, &v_circuit, &gotsomewhere);
michael@0: 			if (n < 0)
michael@0: 				goto fail;
michael@0: 			if (n == 0)
michael@0: 				goto next_ns;
michael@0: 			if (v_circuit)
michael@0: 				goto same_ns;
michael@0: 			resplen = n;
michael@0: 		}
michael@0: 
michael@0: 		Dprint((statp->options & RES_DEBUG) ||
michael@0: 		       ((statp->pfcode & RES_PRF_REPLY) &&
michael@0: 			(statp->pfcode & RES_PRF_HEAD1)),
michael@0: 		       (stdout, ";; got answer:\n"));
michael@0: 
michael@0: 		DprintQ((statp->options & RES_DEBUG) ||
michael@0: 			(statp->pfcode & RES_PRF_REPLY),
michael@0: 			(stdout, "%s", ""),
michael@0: 			ans, (resplen > anssiz) ? anssiz : resplen);
michael@0: 
michael@0: #if USE_RESOLV_CACHE
michael@0:                 if (cache_status == RESOLV_CACHE_NOTFOUND) {
michael@0:                     _resolv_cache_add(cache, buf, buflen,
michael@0:                                       ans, resplen);
michael@0:                 }
michael@0: #endif
michael@0: 		/*
michael@0: 		 * If we have temporarily opened a virtual circuit,
michael@0: 		 * or if we haven't been asked to keep a socket open,
michael@0: 		 * close the socket.
michael@0: 		 */
michael@0: 		if ((v_circuit && (statp->options & RES_USEVC) == 0U) ||
michael@0: 		    (statp->options & RES_STAYOPEN) == 0U) {
michael@0: 			res_nclose(statp);
michael@0: 		}
michael@0: 		if (statp->rhook) {
michael@0: 			int done = 0, loops = 0;
michael@0: 
michael@0: 			do {
michael@0: 				res_sendhookact act;
michael@0: 
michael@0: 				act = (*statp->rhook)(nsap, buf, buflen,
michael@0: 						      ans, anssiz, &resplen);
michael@0: 				switch (act) {
michael@0: 				case res_goahead:
michael@0: 				case res_done:
michael@0: 					done = 1;
michael@0: 					break;
michael@0: 				case res_nextns:
michael@0: 					res_nclose(statp);
michael@0: 					goto next_ns;
michael@0: 				case res_modified:
michael@0: 					/* give the hook another try */
michael@0: 					if (++loops < 42) /*doug adams*/
michael@0: 						break;
michael@0: 					/*FALLTHROUGH*/
michael@0: 				case res_error:
michael@0: 					/*FALLTHROUGH*/
michael@0: 				default:
michael@0: 					goto fail;
michael@0: 				}
michael@0: 			} while (!done);
michael@0: 
michael@0: 		}
michael@0: 		return (resplen);
michael@0:  next_ns: ;
michael@0: 	   } /*foreach ns*/
michael@0: 	} /*foreach retry*/
michael@0: 	res_nclose(statp);
michael@0: 	if (!v_circuit) {
michael@0: 		if (!gotsomewhere)
michael@0: 			errno = ECONNREFUSED;	/* no nameservers found */
michael@0: 		else
michael@0: 			errno = ETIMEDOUT;	/* no answer obtained */
michael@0: 	} else
michael@0: 		errno = terrno;
michael@0: 	return (-1);
michael@0:  fail:
michael@0: 	res_nclose(statp);
michael@0: 	return (-1);
michael@0: }
michael@0: 
michael@0: /* Private */
michael@0: 
michael@0: static int
michael@0: get_salen(sa)
michael@0: 	const struct sockaddr *sa;
michael@0: {
michael@0: 
michael@0: #ifdef HAVE_SA_LEN
michael@0: 	/* There are people do not set sa_len.  Be forgiving to them. */
michael@0: 	if (sa->sa_len)
michael@0: 		return (sa->sa_len);
michael@0: #endif
michael@0: 
michael@0: 	if (sa->sa_family == AF_INET)
michael@0: 		return (sizeof(struct sockaddr_in));
michael@0: 	else if (sa->sa_family == AF_INET6)
michael@0: 		return (sizeof(struct sockaddr_in6));
michael@0: 	else
michael@0: 		return (0);	/* unknown, die on connect */
michael@0: }
michael@0: 
michael@0: /*
michael@0:  * pick appropriate nsaddr_list for use.  see res_init() for initialization.
michael@0:  */
michael@0: static struct sockaddr *
michael@0: get_nsaddr(statp, n)
michael@0: 	res_state statp;
michael@0: 	size_t n;
michael@0: {
michael@0: 
michael@0: 	if (!statp->nsaddr_list[n].sin_family && EXT(statp).ext) {
michael@0: 		/*
michael@0: 		 * - EXT(statp).ext->nsaddrs[n] holds an address that is larger
michael@0: 		 *   than struct sockaddr, and
michael@0: 		 * - user code did not update statp->nsaddr_list[n].
michael@0: 		 */
michael@0: 		return (struct sockaddr *)(void *)&EXT(statp).ext->nsaddrs[n];
michael@0: 	} else {
michael@0: 		/*
michael@0: 		 * - user code updated statp->nsaddr_list[n], or
michael@0: 		 * - statp->nsaddr_list[n] has the same content as
michael@0: 		 *   EXT(statp).ext->nsaddrs[n].
michael@0: 		 */
michael@0: 		return (struct sockaddr *)(void *)&statp->nsaddr_list[n];
michael@0: 	}
michael@0: }
michael@0: 
michael@0: static int
michael@0: send_vc(res_state statp,
michael@0: 	const u_char *buf, int buflen, u_char *ans, int anssiz,
michael@0: 	int *terrno, int ns)
michael@0: {
michael@0: 	const HEADER *hp = (const HEADER *)(const void *)buf;
michael@0: 	HEADER *anhp = (HEADER *)(void *)ans;
michael@0: 	struct sockaddr *nsap;
michael@0: 	int nsaplen;
michael@0: 	int truncating, connreset, resplen, n;
michael@0: 	struct iovec iov[2];
michael@0: 	u_short len;
michael@0: 	u_char *cp;
michael@0: 	void *tmp;
michael@0: 
michael@0: 	nsap = get_nsaddr(statp, (size_t)ns);
michael@0: 	nsaplen = get_salen(nsap);
michael@0: 
michael@0: 	connreset = 0;
michael@0:  same_ns:
michael@0: 	truncating = 0;
michael@0: 
michael@0: 	/* Are we still talking to whom we want to talk to? */
michael@0: 	if (statp->_vcsock >= 0 && (statp->_flags & RES_F_VC) != 0) {
michael@0: 		struct sockaddr_storage peer;
michael@0: 		socklen_t size = sizeof peer;
michael@0: 
michael@0: 		if (getpeername(statp->_vcsock,
michael@0: 				(struct sockaddr *)(void *)&peer, &size) < 0 ||
michael@0: 		    !sock_eq((struct sockaddr *)(void *)&peer, nsap)) {
michael@0: 			res_nclose(statp);
michael@0: 			statp->_flags &= ~RES_F_VC;
michael@0: 		}
michael@0: 	}
michael@0: 
michael@0: 	if (statp->_vcsock < 0 || (statp->_flags & RES_F_VC) == 0) {
michael@0: 		if (statp->_vcsock >= 0)
michael@0: 			res_nclose(statp);
michael@0: 
michael@0: 		statp->_vcsock = socket(nsap->sa_family, SOCK_STREAM, 0);
michael@0: 		if (statp->_vcsock > highestFD) {
michael@0: 			res_nclose(statp);
michael@0: 			errno = ENOTSOCK;
michael@0: 		}
michael@0: 		if (statp->_vcsock < 0) {
michael@0: 			switch (errno) {
michael@0: 			case EPROTONOSUPPORT:
michael@0: #ifdef EPFNOSUPPORT
michael@0: 			case EPFNOSUPPORT:
michael@0: #endif
michael@0: 			case EAFNOSUPPORT:
michael@0: 				Perror(statp, stderr, "socket(vc)", errno);
michael@0: 				return (0);
michael@0: 			default:
michael@0: 				*terrno = errno;
michael@0: 				Perror(statp, stderr, "socket(vc)", errno);
michael@0: 				return (-1);
michael@0: 			}
michael@0: 		}
michael@0: 		errno = 0;
michael@0: 		if (random_bind(statp->_vcsock,nsap->sa_family) < 0) {
michael@0: 			*terrno = errno;
michael@0: 			Aerror(statp, stderr, "bind/vc", errno, nsap,
michael@0: 			    nsaplen);
michael@0: 			res_nclose(statp);
michael@0: 			return (0);
michael@0: 		}
michael@0: 		if (connect(statp->_vcsock, nsap, (socklen_t)nsaplen) < 0) {
michael@0: 			*terrno = errno;
michael@0: 			Aerror(statp, stderr, "connect/vc", errno, nsap,
michael@0: 			    nsaplen);
michael@0: 			res_nclose(statp);
michael@0: 			return (0);
michael@0: 		}
michael@0: 		statp->_flags |= RES_F_VC;
michael@0: 	}
michael@0: 
michael@0: 	/*
michael@0: 	 * Send length & message
michael@0: 	 */
michael@0: 	ns_put16((u_short)buflen, (u_char*)(void *)&len);
michael@0: 	iov[0] = evConsIovec(&len, INT16SZ);
michael@0: 	DE_CONST(buf, tmp);
michael@0: 	iov[1] = evConsIovec(tmp, (size_t)buflen);
michael@0: 	if (writev(statp->_vcsock, iov, 2) != (INT16SZ + buflen)) {
michael@0: 		*terrno = errno;
michael@0: 		Perror(statp, stderr, "write failed", errno);
michael@0: 		res_nclose(statp);
michael@0: 		return (0);
michael@0: 	}
michael@0: 	/*
michael@0: 	 * Receive length & response
michael@0: 	 */
michael@0:  read_len:
michael@0: 	cp = ans;
michael@0: 	len = INT16SZ;
michael@0: 	while ((n = read(statp->_vcsock, (char *)cp, (size_t)len)) > 0) {
michael@0: 		cp += n;
michael@0: 		if ((len -= n) == 0)
michael@0: 			break;
michael@0: 	}
michael@0: 	if (n <= 0) {
michael@0: 		*terrno = errno;
michael@0: 		Perror(statp, stderr, "read failed", errno);
michael@0: 	  res_nclose(statp);
michael@0: 		/*
michael@0: 		 * A long running process might get its TCP
michael@0: 		 * connection reset if the remote server was
michael@0: 		 * restarted.  Requery the server instead of
michael@0: 		 * trying a new one.  When there is only one
michael@0: 		 * server, this means that a query might work
michael@0: 		 * instead of failing.  We only allow one reset
michael@0: 		 * per query to prevent looping.
michael@0: 		 */
michael@0: 		if (*terrno == ECONNRESET && !connreset) {
michael@0: 			connreset = 1;
michael@0: 			res_nclose(statp);
michael@0: 			goto same_ns;
michael@0: 		}
michael@0: 		res_nclose(statp);
michael@0: 		return (0);
michael@0: 	}
michael@0: 	resplen = ns_get16(ans);
michael@0: 	if (resplen > anssiz) {
michael@0: 		Dprint(statp->options & RES_DEBUG,
michael@0: 		       (stdout, ";; response truncated\n")
michael@0: 		       );
michael@0: 		truncating = 1;
michael@0: 		len = anssiz;
michael@0: 	} else
michael@0: 		len = resplen;
michael@0: 	if (len < HFIXEDSZ) {
michael@0: 		/*
michael@0: 		 * Undersized message.
michael@0: 		 */
michael@0: 		Dprint(statp->options & RES_DEBUG,
michael@0: 		       (stdout, ";; undersized: %d\n", len));
michael@0: 		*terrno = EMSGSIZE;
michael@0: 		res_nclose(statp);
michael@0: 		return (0);
michael@0: 	}
michael@0: 	cp = ans;
michael@0: 	while (len != 0 && (n = read(statp->_vcsock, (char *)cp, (size_t)len)) > 0){
michael@0: 		cp += n;
michael@0: 		len -= n;
michael@0: 	}
michael@0: 	if (n <= 0) {
michael@0: 		*terrno = errno;
michael@0: 		Perror(statp, stderr, "read(vc)", errno);
michael@0: 		res_nclose(statp);
michael@0: 		return (0);
michael@0: 	}
michael@0: 	if (truncating) {
michael@0: 		/*
michael@0: 		 * Flush rest of answer so connection stays in synch.
michael@0: 		 */
michael@0: 		anhp->tc = 1;
michael@0: 		len = resplen - anssiz;
michael@0: 		while (len != 0) {
michael@0: 			char junk[PACKETSZ];
michael@0: 
michael@0: 			n = read(statp->_vcsock, junk,
michael@0: 				 (len > sizeof junk) ? sizeof junk : len);
michael@0: 			if (n > 0)
michael@0: 				len -= n;
michael@0: 			else
michael@0: 				break;
michael@0: 		}
michael@0: 	}
michael@0: 	/*
michael@0: 	 * If the calling applicating has bailed out of
michael@0: 	 * a previous call and failed to arrange to have
michael@0: 	 * the circuit closed or the server has got
michael@0: 	 * itself confused, then drop the packet and
michael@0: 	 * wait for the correct one.
michael@0: 	 */
michael@0: 	if (hp->id != anhp->id) {
michael@0: 		DprintQ((statp->options & RES_DEBUG) ||
michael@0: 			(statp->pfcode & RES_PRF_REPLY),
michael@0: 			(stdout, ";; old answer (unexpected):\n"),
michael@0: 			ans, (resplen > anssiz) ? anssiz: resplen);
michael@0: 		goto read_len;
michael@0: 	}
michael@0: 
michael@0: 	/*
michael@0: 	 * All is well, or the error is fatal.  Signal that the
michael@0: 	 * next nameserver ought not be tried.
michael@0: 	 */
michael@0: 	return (resplen);
michael@0: }
michael@0: 
michael@0: static int
michael@0: send_dg(res_state statp,
michael@0: 	const u_char *buf, int buflen, u_char *ans, int anssiz,
michael@0: 	int *terrno, int ns, int *v_circuit, int *gotsomewhere)
michael@0: {
michael@0: 	const HEADER *hp = (const HEADER *)(const void *)buf;
michael@0: 	HEADER *anhp = (HEADER *)(void *)ans;
michael@0: 	const struct sockaddr *nsap;
michael@0: 	int nsaplen;
michael@0: 	struct timespec now, timeout, finish;
michael@0: 	fd_set dsmask;
michael@0: 	struct sockaddr_storage from;
michael@0: 	socklen_t fromlen;
michael@0: 	int resplen, seconds, n, s;
michael@0: 
michael@0: 	nsap = get_nsaddr(statp, (size_t)ns);
michael@0: 	nsaplen = get_salen(nsap);
michael@0: 	if (EXT(statp).nssocks[ns] == -1) {
michael@0: 		EXT(statp).nssocks[ns] = socket(nsap->sa_family, SOCK_DGRAM, 0);
michael@0: 		if (EXT(statp).nssocks[ns] > highestFD) {
michael@0: 			res_nclose(statp);
michael@0: 			errno = ENOTSOCK;
michael@0: 		}
michael@0: 		if (EXT(statp).nssocks[ns] < 0) {
michael@0: 			switch (errno) {
michael@0: 			case EPROTONOSUPPORT:
michael@0: #ifdef EPFNOSUPPORT
michael@0: 			case EPFNOSUPPORT:
michael@0: #endif
michael@0: 			case EAFNOSUPPORT:
michael@0: 				Perror(statp, stderr, "socket(dg)", errno);
michael@0: 				return (0);
michael@0: 			default:
michael@0: 				*terrno = errno;
michael@0: 				Perror(statp, stderr, "socket(dg)", errno);
michael@0: 				return (-1);
michael@0: 			}
michael@0: 		}
michael@0: #ifndef CANNOT_CONNECT_DGRAM
michael@0: 		/*
michael@0: 		 * On a 4.3BSD+ machine (client and server,
michael@0: 		 * actually), sending to a nameserver datagram
michael@0: 		 * port with no nameserver will cause an
michael@0: 		 * ICMP port unreachable message to be returned.
michael@0: 		 * If our datagram socket is "connected" to the
michael@0: 		 * server, we get an ECONNREFUSED error on the next
michael@0: 		 * socket operation, and select returns if the
michael@0: 		 * error message is received.  We can thus detect
michael@0: 		 * the absence of a nameserver without timing out.
michael@0: 		 */
michael@0: 		if (random_bind(EXT(statp).nssocks[ns], nsap->sa_family) < 0) {
michael@0: 			Aerror(statp, stderr, "bind(dg)", errno, nsap,
michael@0: 			    nsaplen);
michael@0: 			res_nclose(statp);
michael@0: 			return (0);
michael@0: 		}
michael@0: 		if (connect(EXT(statp).nssocks[ns], nsap, (socklen_t)nsaplen) < 0) {
michael@0: 			Aerror(statp, stderr, "connect(dg)", errno, nsap,
michael@0: 			    nsaplen);
michael@0: 			res_nclose(statp);
michael@0: 			return (0);
michael@0: 		}
michael@0: #endif /* !CANNOT_CONNECT_DGRAM */
michael@0: 		Dprint(statp->options & RES_DEBUG,
michael@0: 		       (stdout, ";; new DG socket\n"))
michael@0: 	}
michael@0: 	s = EXT(statp).nssocks[ns];
michael@0: #ifndef CANNOT_CONNECT_DGRAM
michael@0: 	if (send(s, (const char*)buf, (size_t)buflen, 0) != buflen) {
michael@0: 		Perror(statp, stderr, "send", errno);
michael@0: 		res_nclose(statp);
michael@0: 		return (0);
michael@0: 	}
michael@0: #else /* !CANNOT_CONNECT_DGRAM */
michael@0: 	if (sendto(s, (const char*)buf, buflen, 0, nsap, nsaplen) != buflen)
michael@0: 	{
michael@0: 		Aerror(statp, stderr, "sendto", errno, nsap, nsaplen);
michael@0: 		res_nclose(statp);
michael@0: 		return (0);
michael@0: 	}
michael@0: #endif /* !CANNOT_CONNECT_DGRAM */
michael@0: 
michael@0: 	/*
michael@0: 	 * Wait for reply.
michael@0: 	 */
michael@0: 	seconds = (statp->retrans << ns);
michael@0: 	if (ns > 0)
michael@0: 		seconds /= statp->nscount;
michael@0: 	if (seconds <= 0)
michael@0: 		seconds = 1;
michael@0: 	now = evNowTime();
michael@0: 	timeout = evConsTime((long)seconds, 0L);
michael@0: 	finish = evAddTime(now, timeout);
michael@0: 	goto nonow;
michael@0:  wait:
michael@0: 	now = evNowTime();
michael@0:  nonow:
michael@0: 	FD_ZERO(&dsmask);
michael@0: 	FD_SET(s, &dsmask);
michael@0: 	if (evCmpTime(finish, now) > 0)
michael@0: 		timeout = evSubTime(finish, now);
michael@0: 	else
michael@0: 		timeout = evConsTime(0L, 0L);
michael@0: 	n = pselect(s + 1, &dsmask, NULL, NULL, &timeout, NULL);
michael@0: 	if (n == 0) {
michael@0: 		Dprint(statp->options & RES_DEBUG, (stdout, ";; timeout\n"));
michael@0: 		*gotsomewhere = 1;
michael@0: 		return (0);
michael@0: 	}
michael@0: 	if (n < 0) {
michael@0: 		if (errno == EINTR)
michael@0: 			goto wait;
michael@0: 		Perror(statp, stderr, "select", errno);
michael@0: 		res_nclose(statp);
michael@0: 		return (0);
michael@0: 	}
michael@0: 	errno = 0;
michael@0: 	fromlen = sizeof(from);
michael@0: 	resplen = recvfrom(s, (char*)ans, (size_t)anssiz,0,
michael@0: 			   (struct sockaddr *)(void *)&from, &fromlen);
michael@0: 	if (resplen <= 0) {
michael@0: 		Perror(statp, stderr, "recvfrom", errno);
michael@0: 		res_nclose(statp);
michael@0: 		return (0);
michael@0: 	}
michael@0: 	*gotsomewhere = 1;
michael@0: 	if (resplen < HFIXEDSZ) {
michael@0: 		/*
michael@0: 		 * Undersized message.
michael@0: 		 */
michael@0: 		Dprint(statp->options & RES_DEBUG,
michael@0: 		       (stdout, ";; undersized: %d\n",
michael@0: 			resplen));
michael@0: 		*terrno = EMSGSIZE;
michael@0: 		res_nclose(statp);
michael@0: 		return (0);
michael@0: 	}
michael@0: 	if (hp->id != anhp->id) {
michael@0: 		/*
michael@0: 		 * response from old query, ignore it.
michael@0: 		 * XXX - potential security hazard could
michael@0: 		 *	 be detected here.
michael@0: 		 */
michael@0: 		DprintQ((statp->options & RES_DEBUG) ||
michael@0: 			(statp->pfcode & RES_PRF_REPLY),
michael@0: 			(stdout, ";; old answer:\n"),
michael@0: 			ans, (resplen > anssiz) ? anssiz : resplen);
michael@0: 		goto wait;
michael@0: 	}
michael@0: 	if (!(statp->options & RES_INSECURE1) &&
michael@0: 	    !res_ourserver_p(statp, (struct sockaddr *)(void *)&from)) {
michael@0: 		/*
michael@0: 		 * response from wrong server? ignore it.
michael@0: 		 * XXX - potential security hazard could
michael@0: 		 *	 be detected here.
michael@0: 		 */
michael@0: 		DprintQ((statp->options & RES_DEBUG) ||
michael@0: 			(statp->pfcode & RES_PRF_REPLY),
michael@0: 			(stdout, ";; not our server:\n"),
michael@0: 			ans, (resplen > anssiz) ? anssiz : resplen);
michael@0: 		goto wait;
michael@0: 	}
michael@0: #ifdef RES_USE_EDNS0
michael@0: 	if (anhp->rcode == FORMERR && (statp->options & RES_USE_EDNS0) != 0U) {
michael@0: 		/*
michael@0: 		 * Do not retry if the server do not understand EDNS0.
michael@0: 		 * The case has to be captured here, as FORMERR packet do not
michael@0: 		 * carry query section, hence res_queriesmatch() returns 0.
michael@0: 		 */
michael@0: 		DprintQ(statp->options & RES_DEBUG,
michael@0: 			(stdout, "server rejected query with EDNS0:\n"),
michael@0: 			ans, (resplen > anssiz) ? anssiz : resplen);
michael@0: 		/* record the error */
michael@0: 		statp->_flags |= RES_F_EDNS0ERR;
michael@0: 		res_nclose(statp);
michael@0: 		return (0);
michael@0: 	}
michael@0: #endif
michael@0: 	if (!(statp->options & RES_INSECURE2) &&
michael@0: 	    !res_queriesmatch(buf, buf + buflen,
michael@0: 			      ans, ans + anssiz)) {
michael@0: 		/*
michael@0: 		 * response contains wrong query? ignore it.
michael@0: 		 * XXX - potential security hazard could
michael@0: 		 *	 be detected here.
michael@0: 		 */
michael@0: 		DprintQ((statp->options & RES_DEBUG) ||
michael@0: 			(statp->pfcode & RES_PRF_REPLY),
michael@0: 			(stdout, ";; wrong query name:\n"),
michael@0: 			ans, (resplen > anssiz) ? anssiz : resplen);
michael@0: 		goto wait;
michael@0: 	}
michael@0: 	if (anhp->rcode == SERVFAIL ||
michael@0: 	    anhp->rcode == NOTIMP ||
michael@0: 	    anhp->rcode == REFUSED) {
michael@0: 		DprintQ(statp->options & RES_DEBUG,
michael@0: 			(stdout, "server rejected query:\n"),
michael@0: 			ans, (resplen > anssiz) ? anssiz : resplen);
michael@0: 		res_nclose(statp);
michael@0: 		/* don't retry if called from dig */
michael@0: 		if (!statp->pfcode)
michael@0: 			return (0);
michael@0: 	}
michael@0: 	if (!(statp->options & RES_IGNTC) && anhp->tc) {
michael@0: 		/*
michael@0: 		 * To get the rest of answer,
michael@0: 		 * use TCP with same server.
michael@0: 		 */
michael@0: 		Dprint(statp->options & RES_DEBUG,
michael@0: 		       (stdout, ";; truncated answer\n"));
michael@0: 		*v_circuit = 1;
michael@0: 		res_nclose(statp);
michael@0: 		return (1);
michael@0: 	}
michael@0: 	/*
michael@0: 	 * All is well, or the error is fatal.  Signal that the
michael@0: 	 * next nameserver ought not be tried.
michael@0: 	 */
michael@0: 	return (resplen);
michael@0: }
michael@0: 
michael@0: static void
michael@0: Aerror(const res_state statp, FILE *file, const char *string, int error,
michael@0:        const struct sockaddr *address, int alen)
michael@0: {
michael@0: 	int save = errno;
michael@0: 	char hbuf[NI_MAXHOST];
michael@0: 	char sbuf[NI_MAXSERV];
michael@0: 
michael@0: 	alen = alen;
michael@0: 
michael@0: 	if ((statp->options & RES_DEBUG) != 0U) {
michael@0: 		if (getnameinfo(address, (socklen_t)alen, hbuf, sizeof(hbuf),
michael@0: 		    sbuf, sizeof(sbuf), niflags)) {
michael@0: 			strncpy(hbuf, "?", sizeof(hbuf) - 1);
michael@0: 			hbuf[sizeof(hbuf) - 1] = '\0';
michael@0: 			strncpy(sbuf, "?", sizeof(sbuf) - 1);
michael@0: 			sbuf[sizeof(sbuf) - 1] = '\0';
michael@0: 		}
michael@0: 		fprintf(file, "res_send: %s ([%s].%s): %s\n",
michael@0: 			string, hbuf, sbuf, strerror(error));
michael@0: 	}
michael@0: 	errno = save;
michael@0: }
michael@0: 
michael@0: static void
michael@0: Perror(const res_state statp, FILE *file, const char *string, int error) {
michael@0: 	int save = errno;
michael@0: 
michael@0: 	if ((statp->options & RES_DEBUG) != 0U)
michael@0: 		fprintf(file, "res_send: %s: %s\n",
michael@0: 			string, strerror(error));
michael@0: 	errno = save;
michael@0: }
michael@0: 
michael@0: static int
michael@0: sock_eq(struct sockaddr *a, struct sockaddr *b) {
michael@0: 	struct sockaddr_in *a4, *b4;
michael@0: 	struct sockaddr_in6 *a6, *b6;
michael@0: 
michael@0: 	if (a->sa_family != b->sa_family)
michael@0: 		return 0;
michael@0: 	switch (a->sa_family) {
michael@0: 	case AF_INET:
michael@0: 		a4 = (struct sockaddr_in *)(void *)a;
michael@0: 		b4 = (struct sockaddr_in *)(void *)b;
michael@0: 		return a4->sin_port == b4->sin_port &&
michael@0: 		    a4->sin_addr.s_addr == b4->sin_addr.s_addr;
michael@0: 	case AF_INET6:
michael@0: 		a6 = (struct sockaddr_in6 *)(void *)a;
michael@0: 		b6 = (struct sockaddr_in6 *)(void *)b;
michael@0: 		return a6->sin6_port == b6->sin6_port &&
michael@0: #ifdef HAVE_SIN6_SCOPE_ID
michael@0: 		    a6->sin6_scope_id == b6->sin6_scope_id &&
michael@0: #endif
michael@0: 		    IN6_ARE_ADDR_EQUAL(&a6->sin6_addr, &b6->sin6_addr);
michael@0: 	default:
michael@0: 		return 0;
michael@0: 	}
michael@0: }
michael@0: 
michael@0: #ifdef NEED_PSELECT
michael@0: /* XXX needs to move to the porting library. */
michael@0: static int
michael@0: pselect(int nfds, void *rfds, void *wfds, void *efds,
michael@0: 	struct timespec *tsp, const sigset_t *sigmask)
michael@0: {
michael@0: 	struct timeval tv, *tvp;
michael@0: 	sigset_t sigs;
michael@0: 	int n;
michael@0: 
michael@0: 	if (tsp) {
michael@0: 		tvp = &tv;
michael@0: 		tv = evTimeVal(*tsp);
michael@0: 	} else
michael@0: 		tvp = NULL;
michael@0: 	if (sigmask)
michael@0: 		sigprocmask(SIG_SETMASK, sigmask, &sigs);
michael@0: 	n = select(nfds, rfds, wfds, efds, tvp);
michael@0: 	if (sigmask)
michael@0: 		sigprocmask(SIG_SETMASK, &sigs, NULL);
michael@0: 	if (tsp)
michael@0: 		*tsp = evTimeSpec(tv);
michael@0: 	return (n);
michael@0: }
michael@0: #endif