Wed May 22 22:10:01 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>

	* stdlib/canonicalize.c: New file.
	* stdlib/stdlib.h: Declare canonicalize_file_name, realpath.
	* stdlib/Makefile (routines): Add canonicalize.

	* posix/unistd.h: Declare __canonicalize_directory_name_internal.

Thu May 23 00:01:10 1996  Ulrich Drepper  <drepper@cygnus.com>

	* db/recno/rec_seq.c: Prevent `sccsid' definition by using the
	same #if condition as in the other db files.

	* intl/Makefile: Add -Wno-unused CFLAGS for compilation of
	bindtextdom.c, finddomain.c, and localealias.c.

	* intl/dcgettext.c: Don't define prototype for getcwd() when
	compiling in glibc.

	* libio/cleanup.c: Add prototype for _IO_register_cleanup.

	* libio/filedoalloc.c, libio/fileops.c, libio/iopopen.c: Don't
        define _POSIX_SOURCE unconditionally.

	* libio/filedoalloc.c, libio/iopopen.c: Include <unistd.h> if
        compiling in glibc.

	* libio/fileops.c (_IO_file_close_it): Don't sync file, call
	flush instead.  This relaxes the rules from POSIX.1 about
	changing the active handle a bit.

	* libio/iofopncook.c (struct _IO_cookie_file): Move definition
	into <libio.h>.
	Add prototypes for local functions to prevent warnings.

	* libio/iopopen.c: Change prototypes for _IO_fork, _IO_pipe, and
        _IO_DUP2 to contain complete parameter list.

	* libio/libio.h: Add definition of struct _IO_cookie_file.

	* libio/libioP.h: Add prototypes for _IO_vasprintf, _IO_vdprintf,
        and _IO_vsnprintf.

	* libio/memstream.c: Include <stdio.h>.

	* libio/stdio.h: Add prototypes for fopencookie,
        __stdio_gen_tempname, __vfscanf, __vsscanf, and __vsnprintf.

	* libio/strops.c: Avoid useless expression in `for' initializer.

	* locale/findlocale.c: Add some casts to prevent warnings.

	* locale/programs/locfile.c (write_locale_data): Don't use
	double `/' in locale binary file.

	* posix/unistd.h: Remove prototype for `reboot'.

	Update from bind-4.9.4-T1A.
	* resolv/Makefile (routines): Add inet_ntop and inet_pton.
	* resolv/arpa/nameser.h: Add definition of IN6ADDRSZ.
	* resolv/gethnamaddr.c, resolv/getnetnamadr.c, resolv/res_comp.c,
	resolv/res_debug.c, resolv/res_init.c

	* resolv/inet_ntop.c, resolv/inet_pton.c: New files.

	* resolv/resolv.h: Add RES_USE_INET6 flag.
	(__dn_isvalid): Renamed to __res_dnok.
	Add prototypes for __res_ownok and __res_mailok.

	* stdio-common/Makefile: Add -Wno-unused to CFLAGS for _itoa.c.

	* stdio-common/getline.c, stdio-common/vfscanf.c,
        sysdeps/posix/tempname.c: Don't use <ansidecl.h> anymore.

	* sysdeps/unix/sysv/linux/Makefile [$subdir == misc]
        (sysdep_routines): Add s_reboot.
	(install-others): Add $(includedir)/sys/syscall.h.
	New rule for $(includedir)/sys/syscall.h to produce from
	<asm/unistd.h>.

	* sysdeps/unix/sysv/linux/reboot.c: New file.  Make single
        argument function call 3 argument system call.

	* sysdeps/unix/sysv/linux/sys/reboot.h: New file.  Linux specific
	definition for reboot function.

	* sysdeps/unix/sysv/linux/syscall.h: Remove old and obsolete
        comment.

	* sysdeps/unix/sysv/linux/syscalls.list: Rename function for
	reboot syscall to __syscall_reboot.

	* wcsmbs/wchar.h: Protect prototypes for wcstof and wcstold by
	__USE_GNU, not USE_GNU.

Tue May 21 21:55:49 1996  David Mosberger-Tang  <davidm@AZStarNet.com>

	* locale/programs/charset.c, locale/programs/ld-collate.c:
	Add casts to prevent warnings on 64-bit machines.

	* locale/programs/ld-monetary.c: Don't do unnecessary tests for
	int_frac_digits and frac_digits which only produce warnings.

Mon May 13 23:45:29 1996  David Mosberger-Tang  <davidm@AZStarNet.com>

	* inet/arpa/inet.h: Backup return type of inet_addr to u_long.
	* resolv/inet_addr.c: Likewise.

	* resolv/Makefile (distribute): Add res_hconf.h
	(routines): Add res_hconf.

	* resolv/gethnamaddr.c: Add support for /etc/host.conf.

	* resolv/res_init.c: Initialize /etc/host.conf reader.

	* resolv/res_hconf.c, resolv/res_hconf.h: New files.
        Implementation of reading /etc/host.conf.

Wed May 22 21:21:15 1996  Roland McGrath  <roland@delasyd.gnu.ai.mit.edu>

	* Rules (%.out rules): Prepend $($*-ENV) to the command.

	* sysdeps/unix/sysv/linux/i386/brk.c (___brk_addr): Define as weak
	alias for __curbrk.

Wed May 22 19:37:27 1996  Miles Bader  <miles@gnu.ai.mit.edu>

	* hurd/hurdexec.c (_hurd_exec): Pass INIT_TRACEMASK.
	* hurd/hurdmsg.c (set_int): Support INIT_TRACEMASK.

Wed May 22 18:47:31 1996  Roland McGrath  <roland@delasyd.gnu.ai.mit.edu>

	* sysdeps/mach/hurd/getcwd.c
	(_hurd_canonicalize_directory_name_internal): New function, broken out
	of __getcwd.
	(__getcwd): Use it.
	(__canonicalize_directory_name_internal): New function using it.

	* sysdeps/posix/getcwd.c (__canonicalize_directory_name_internal): New
	function, broken out of __getcwd.
	(__getcwd): Use it.

Wed May 22 18:14:05 1996  Miles Bader  <miles@gnu.ai.mit.edu>

	* string/argz-create.c (__argz_create): Correctly calculate length.

	* string/argz-extract.c (__argz_extract): Add terminating 0 entry.
	* hurd/hurdstartup.c (_hurd_startup): ... and don't so here.

	[HAVE_VMSDIR_H]: Include "vmsdir.h".
	(glob) [VMS]: Don't grok ~.

13 files changed, 1735 insertions, 222 deletions

diff --git a/resolv/Makefile b/resolv/Makefile
index ebb8967155..58f32821fe 100644
--- a/resolv/Makefile
+++ b/resolv/Makefile
@@ -22,11 +22,12 @@
 subdir	:= resolv
 
 headers	:= resolv.h netdb.h arpa/nameser.h sys/bitypes.h
-distribute := ../conf/portability.h
+distribute := ../conf/portability.h res_hconf.h
 
 routines := gethnamaddr getnetbyaddr getnetbyname getnetent getnetnamadr \
 	    herror nsap_addr res_comp res_debug res_data res_init res_mkquery \
-	    res_query res_send sethostent inet_addr
+	    res_query res_send sethostent inet_addr inet_ntop inet_pton \
+	    res_hconf
 
 include ../Rules
 
diff --git a/resolv/arpa/nameser.h b/resolv/arpa/nameser.h
index 3792b7963c..0fb04a1a02 100644
--- a/resolv/arpa/nameser.h
+++ b/resolv/arpa/nameser.h
@@ -3,7 +3,7 @@
  * -
  * Copyright (c) 1983, 1989, 1993
  *    The Regents of the University of California.  All rights reserved.
- * 
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ -19,7 +19,7 @@
  * 4. Neither the name of the University nor the names of its contributors
  *    may be used to endorse or promote products derived from this software
  *    without specific prior written permission.
- * 
+ *
  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
@@ -33,14 +33,14 @@
  * SUCH DAMAGE.
  * -
  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
- * 
+ *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
  * copyright notice and this permission notice appear in all copies, and that
  * the name of Digital Equipment Corporation not be used in advertising or
  * publicity pertaining to distribution of the document or software without
  * specific, written prior permission.
- * 
+ *
  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
@@ -97,7 +97,8 @@
 #define RRFIXEDSZ	10		/* #/bytes of fixed data in r record */
 #define	INT32SZ		4		/* for systems without 32-bit ints */
 #define	INT16SZ		2		/* for systems without 16-bit ints */
-#define	INADDRSZ	4		/* for sizeof(struct inaddr) != 4 */
+#define	INADDRSZ	4		/* IPv4 T_A */
+#define IN6ADDRSZ	16		/* IPv6 T_AAAA */
 
 /*
  * Internet nameserver port number
@@ -110,7 +111,7 @@
 #define QUERY		0x0		/* standard query */
 #define IQUERY		0x1		/* inverse query */
 #define STATUS		0x2		/* nameserver status query */
-/*#define xxx		0x3		/* 0x3 reserved */
+/*#define xxx		0x3*/		/* 0x3 reserved */
 #define	NS_NOTIFY_OP	0x4		/* notify secondary of SOA change */
 #ifdef ALLOW_UPDATES
 	/* non standard - supports ALLOW_UPDATES stuff from Mike Schwartz */
diff --git a/resolv/gethnamaddr.c b/resolv/gethnamaddr.c
index f108f2778f..b80595b7d5 100644
--- a/resolv/gethnamaddr.c
+++ b/resolv/gethnamaddr.c
@@ -3,7 +3,7 @@
  * -
  * Copyright (c) 1985, 1988, 1993
  *    The Regents of the University of California.  All rights reserved.
- * 
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ -19,7 +19,7 @@
  * 4. Neither the name of the University nor the names of its contributors
  *    may be used to endorse or promote products derived from this software
  *    without specific prior written permission.
- * 
+ *
  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
@@ -33,14 +33,14 @@
  * SUCH DAMAGE.
  * -
  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
- * 
+ *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
  * copyright notice and this permission notice appear in all copies, and that
  * the name of Digital Equipment Corporation not be used in advertising or
  * publicity pertaining to distribution of the document or software without
  * specific, written prior permission.
- * 
+ *
  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
@@ -71,13 +71,15 @@ static char rcsid[] = "$Id$";
 #include <errno.h>
 #include <syslog.h>
 
+#include "res_hconf.h"
+
 #ifndef LOG_AUTH
 # define LOG_AUTH 0
 #endif
 
 #define MULTI_PTRS_ARE_ALIASES 1	/* XXX - experimental */
 
-#if defined(BSD) && (BSD >= 199103)
+#if defined(BSD) && (BSD >= 199103) && defined(AF_INET6)
 # include <string.h>
 #else
 # include "../conf/portability.h"
@@ -88,6 +90,7 @@ static char rcsid[] = "$Id$";
 
 #define	MAXALIASES	35
 #define	MAXADDRS	35
+#define	MAXADDRBUFSIZE	8192
 
 static const char AskedForGot[] =
 			  "gethostby*.getanswer: asked for \"%s\", got \"%s\"";
@@ -97,11 +100,14 @@ static struct hostent *gethostbyname_ipv4 __P((const char *));
 
 static struct hostent host;
 static char *host_aliases[MAXALIASES];
-static char hostbuf[8*1024];
-static struct in_addr host_addr;
+static char hostbuf[MAXADDRBUFSIZE];
+static u_char host_addr[16];	/* IPv4 or IPv6 */
 static FILE *hostf = NULL;
 static int stayopen = 0;
 
+static void map_v4v6_address __P((const char *src, char *dst));
+static void map_v4v6_hostent __P((struct hostent *hp, char **bp, int *len));
+
 #ifdef RESOLVSORT
 static void addrsort __P((char **, int));
 #endif
@@ -142,11 +148,11 @@ dprintf(msg, num)
 #endif
 
 static struct hostent *
-getanswer(answer, anslen, qname, qclass, qtype)
+getanswer(answer, anslen, qname, qtype)
 	const querybuf *answer;
 	int anslen;
 	const char *qname;
-	int qclass, qtype;
+	int qtype;
 {
 	register const HEADER *hp;
 	register const u_char *cp;
@@ -165,13 +171,14 @@ getanswer(answer, anslen, qname, qclass, qtype)
 	eom = answer->buf + anslen;
 	switch (qtype) {
 	case T_A:
+	case T_AAAA:
 		name_ok = res_hnok;
 		break;
 	case T_PTR:
-		name_ok = dn_isvalid;
+		name_ok = res_dnok;
 		break;
 	default:
-		abort();
+		return (NULL);	/* XXX should be abort(); */
 	}
 	/*
 	 * find first satisfactory answer
@@ -192,7 +199,7 @@ getanswer(answer, anslen, qname, qclass, qtype)
 		return (NULL);
 	}
 	cp += n + QFIXEDSZ;
-	if (qtype == T_A) {
+	if (qtype == T_A || qtype == T_AAAA) {
 		/* res_send() has already verified that the query name is the
 		 * same as the one we sent; this just gets the expanded name
 		 * (i.e., with the succeeding search-domain tacked on).
@@ -209,9 +216,7 @@ getanswer(answer, anslen, qname, qclass, qtype)
 	host.h_aliases = host_aliases;
 	hap = h_addr_ptrs;
 	*hap = NULL;
-#if BSD >= 43 || defined(h_addr)	/* new-style hostent structure */
 	host.h_addr_list = h_addr_ptrs;
-#endif
 	haveanswer = 0;
 	had_error = 0;
 	while (ancount-- > 0 && cp < eom && !had_error) {
@@ -227,12 +232,12 @@ getanswer(answer, anslen, qname, qclass, qtype)
  		cp += INT16SZ + INT32SZ;	/* class, TTL */
 		n = _getshort(cp);
 		cp += INT16SZ;			/* len */
-		if (class != qclass) {
+		if (class != C_IN) {
 			/* XXX - debug? syslog? */
 			cp += n;
 			continue;		/* XXX - had_error++ ? */
 		}
-		if (qtype == T_A && type == T_CNAME) {
+		if ((qtype == T_A || qtype == T_AAAA) && type == T_CNAME) {
 			if (ap >= &host_aliases[MAXALIASES-1])
 				continue;
 			n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
@@ -241,12 +246,6 @@ getanswer(answer, anslen, qname, qclass, qtype)
 				continue;
 			}
 			cp += n;
-			if (host.h_name && strcasecmp(host.h_name, bp) != 0) {
-				syslog(LOG_NOTICE|LOG_AUTH,
-		"gethostby*.getanswer: asked for \"%s\", got CNAME for \"%s\"",
-				       host.h_name, bp);
-				continue;	/* XXX - had_error++ ? */
-			}
 			/* Store alias. */
 			*ap++ = bp;
 			n = strlen(bp) + 1;	/* for the \0 */
@@ -286,7 +285,7 @@ getanswer(answer, anslen, qname, qclass, qtype)
 		if (type != qtype) {
 			syslog(LOG_NOTICE|LOG_AUTH,
 	       "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"",
-			       qname, p_class(qclass), p_type(qtype),
+			       qname, p_class(C_IN), p_type(qtype),
 			       p_type(type));
 			cp += n;
 			continue;		/* XXX - had_error++ ? */
@@ -320,10 +319,17 @@ getanswer(answer, anslen, qname, qclass, qtype)
 			break;
 #else
 			host.h_name = bp;
+			if (_res.options & RES_USE_INET6) {
+				n = strlen(bp) + 1;	/* for the \0 */
+				bp += n;
+				buflen -= n;
+				map_v4v6_hostent(&host, &bp, &buflen);
+			}
 			h_errno = NETDB_SUCCESS;
 			return (&host);
 #endif
 		case T_A:
+		case T_AAAA:
 			if (strcasecmp(host.h_name, bp) != 0) {
 				syslog(LOG_NOTICE|LOG_AUTH,
 				       AskedForGot, host.h_name, bp);
@@ -338,10 +344,6 @@ getanswer(answer, anslen, qname, qclass, qtype)
 			} else {
 				register int nn;
 
-				host.h_length = n;
-				host.h_addrtype = (class == C_IN)
-						  ? AF_INET
-						  : AF_UNSPEC;
 				host.h_name = bp;
 				nn = strlen(bp) + 1;	/* for the \0 */
 				bp += nn;
@@ -367,13 +369,11 @@ getanswer(answer, anslen, qname, qclass, qtype)
 			cp += n;
 			break;
 		default:
-			dprintf("Impossible condition (type=%d)\n", type);
-			h_errno = NO_RECOVERY;
-			return (NULL);
-		} /*switch*/
+			abort();
+		}
 		if (!had_error)
 			haveanswer++;
-	} /*while*/
+	}
 	if (haveanswer) {
 		*ap = NULL;
 		*hap = NULL;
@@ -383,44 +383,39 @@ getanswer(answer, anslen, qname, qclass, qtype)
 		 * in its return structures - should give it the "best"
 		 * address in that case, not some random one
 		 */
-		if (_res.nsort && haveanswer > 1 &&
-		    qclass == C_IN && qtype == T_A)
+		if (_res.nsort && haveanswer > 1 && qtype == T_A)
 			addrsort(h_addr_ptrs, haveanswer);
 # endif /*RESOLVSORT*/
-#if BSD >= 43 || defined(h_addr)	/* new-style hostent structure */
-		/* nothing */
-#else
-		host.h_addr = h_addr_ptrs[0];
-#endif /*BSD*/
 		if (!host.h_name) {
 			n = strlen(qname) + 1;	/* for the \0 */
+			if (n > buflen)
+				goto try_again;
 			strcpy(bp, qname);
 			host.h_name = bp;
+			bp += n;
+			buflen -= n;
 		}
+		if (_res.options & RES_USE_INET6)
+			map_v4v6_hostent(&host, &bp, &buflen);
 		h_errno = NETDB_SUCCESS;
 		return (&host);
-	} else {
-		h_errno = TRY_AGAIN;
-		return (NULL);
 	}
+ try_again:
+	h_errno = TRY_AGAIN;
+	return (NULL);
 }
 
 struct hostent *
 gethostbyname(name)
 	const char *name;
 {
-  /* Moved #if line to here because declaring HP would lead to a
-     warning.  --drepper@gnu  */
-#if defined(AF_INET6) && defined(RES_TRY_INET6)
 	struct hostent *hp;
 
-/* #if defined(AF_INET6) && defined(RES_TRY_INET6) */
-	if (_res.options & RES_TRY_INET6) {
+	if (_res.options & RES_USE_INET6) {
 		hp = gethostbyname2(name, AF_INET6);
 		if (hp)
 			return (hp);
 	}
-#endif
 	return (gethostbyname2(name, AF_INET));
 }
 
@@ -429,29 +424,35 @@ gethostbyname2(name, af)
 	const char *name;
 	int af;
 {
-	switch (af) {
-	case AF_INET:
-		return (gethostbyname_ipv4(name));
-	}
-	errno = EAFNOSUPPORT;
-	h_errno = NETDB_INTERNAL;
-	return (NULL);
-}
-
-static struct hostent *
-gethostbyname_ipv4(name)
-	const char *name;
-{
 	querybuf buf;
 	register const char *cp;
-	int n;
-	extern struct hostent *_gethtbyname();
+	char *bp;
+	int i, n, size, type, len;
+	extern struct hostent *_gethtbyname2();
 
 	if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
 		h_errno = NETDB_INTERNAL;
 		return (NULL);
 	}
 
+	switch (af) {
+	case AF_INET:
+		size = INADDRSZ;
+		type = T_A;
+		break;
+	case AF_INET6:
+		size = IN6ADDRSZ;
+		type = T_AAAA;
+		break;
+	default:
+		h_errno = NETDB_INTERNAL;
+		errno = EAFNOSUPPORT;
+		return (NULL);
+	}
+
+	host.h_addrtype = af;
+	host.h_length = size;
+
 	/*
 	 * if there aren't any dots, it could be a user-level alias.
 	 * this is also done in res_query() since we are not the only
@@ -474,117 +475,254 @@ gethostbyname_ipv4(name)
 				 * Fake up a hostent as if we'd actually
 				 * done a lookup.
 				 */
-				if (!inet_aton(name, &host_addr)) {
+				if (inet_pton(af, name, host_addr,
+					       sizeof host_addr) <= 0) {
 					h_errno = HOST_NOT_FOUND;
 					return (NULL);
 				}
 				strncpy(hostbuf, name, MAXDNAME);
 				hostbuf[MAXDNAME] = '\0';
+				bp = hostbuf + MAXDNAME;
+				len = sizeof hostbuf - MAXDNAME;
 				host.h_name = hostbuf;
 				host.h_aliases = host_aliases;
 				host_aliases[0] = NULL;
-				host.h_addrtype = AF_INET;
-				host.h_length = INT32SZ;
 				h_addr_ptrs[0] = (char *)&host_addr;
 				h_addr_ptrs[1] = NULL;
-#if BSD >= 43 || defined(h_addr)	/* new-style hostent structure */
 				host.h_addr_list = h_addr_ptrs;
-#else
-				host.h_addr = h_addr_ptrs[0];
-#endif
+				if (_res.options & RES_USE_INET6)
+					map_v4v6_hostent(&host, &bp, &len);
 				h_errno = NETDB_SUCCESS;
 				return (&host);
 			}
-			if (!isdigit(*cp) && *cp != '.') 
+			if (!isdigit(*cp) && *cp != '.')
 				break;
 		}
 
-	if ((n = res_search(name, C_IN, T_A, buf.buf, sizeof(buf))) < 0) {
-		dprintf("res_search failed (%d)\n", n);
-		if (errno == ECONNREFUSED)
-			return (_gethtbyname(name));
-		return (NULL);
+	h_errno = HOST_NOT_FOUND;
+	for (i = 0; i < _res_hconf.num_services; ++i) {
+		struct hostent * hp;
+		char * cp = (char *) name;
+
+		if (_res_hconf.num_trimdomains > 0) {
+			size_t name_len = strlen(name);
+
+			cp = malloc(name_len + 1);
+			memcpy(cp, name, name_len + 1);
+			_res_hconf_trim_domain(cp);
+		}
+
+		hp = NULL;
+		switch (_res_hconf.service[i]) {
+		      case SERVICE_BIND:
+			if ((n = res_search(cp, C_IN, type,
+					    buf.buf, sizeof(buf))) < 0)
+			{
+				dprintf("res_search failed (%d)\n", n);
+				break;
+			}
+			hp = getanswer(&buf, n, cp, type);
+			break;
+
+		      case SERVICE_HOSTS:
+			hp = _gethtbyname2(cp, af);
+			break;
+#ifdef HAVE_NYS
+		      case SERVICE_NIS:
+			hp = _getnishost(cp, "hosts.byname");
+			break;
+#endif
+		      default:
+			break;
+		}
+		if (cp != name)
+			free(cp);
+		if (hp) {
+			if ((_res_hconf.flags & HCONF_FLAG_REORDER)
+			    && hp->h_addr_list[0] && hp->h_addr_list[1])
+				_res_hconf_reorder_addrs(hp);
+			_res_hconf_trim_domains(hp);
+			return hp;
+		}
 	}
-	return (getanswer(&buf, n, name, C_IN, T_A));
+	if (h_errno == NETDB_SUCCESS)
+		h_errno = HOST_NOT_FOUND;
+	return NULL;
 }
 
 struct hostent *
-gethostbyaddr(addr, len, type)
-	const char *addr;
-	int len, type;
+gethostbyaddr(addr, len, af)
+	const char *addr;	/* XXX should have been def'd as u_char! */
+	int len, af;
 {
-	int n;
+	const u_char *uaddr = (const u_char *)addr;
+	static const u_char mapped[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0xff,0xff };
+	static const u_char tunnelled[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0,0 };
+	int n, size;
 	querybuf buf;
 	register struct hostent *hp;
-	char qbuf[MAXDNAME+1];
-#ifdef SUNSECURITY
+	char qbuf[MAXDNAME+1], *qp;
 	register struct hostent *rhp;
 	char **haddr;
 	u_long old_options;
 	char hname2[MAXDNAME+1];
-#endif /*SUNSECURITY*/
+	int i, old_num_trimdomains;
 	extern struct hostent *_gethtbyaddr();
-	
+
 	if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
 		h_errno = NETDB_INTERNAL;
 		return (NULL);
 	}
-	if (type != AF_INET || len != INADDRSZ) {
+	if (af == AF_INET6 && len == IN6ADDRSZ &&
+	    (!bcmp(uaddr, mapped, sizeof mapped) ||
+	     !bcmp(uaddr, tunnelled, sizeof tunnelled))) {
+		/* Unmap. */
+		addr += sizeof mapped;
+		uaddr += sizeof mapped;
+		af = AF_INET;
+		len = INADDRSZ;
+	}
+	switch (af) {
+	case AF_INET:
+		size = INADDRSZ;
+		break;
+	case AF_INET6:
+		size = IN6ADDRSZ;
+		break;
+	default:
 		errno = EAFNOSUPPORT;
 		h_errno = NETDB_INTERNAL;
 		return (NULL);
 	}
-	(void)sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa",
-		((unsigned)addr[3] & 0xff),
-		((unsigned)addr[2] & 0xff),
-		((unsigned)addr[1] & 0xff),
-		((unsigned)addr[0] & 0xff));
-	n = res_query(qbuf, C_IN, T_PTR, (u_char *)buf.buf, sizeof buf.buf);
-	if (n < 0) {
-		dprintf("res_query failed (%d)\n", n);
-		if (errno == ECONNREFUSED)
-			return (_gethtbyaddr(addr, len, type));
-		return (NULL);
-	}
-	if (!(hp = getanswer(&buf, n, qbuf, C_IN, T_PTR)))
-		return (NULL);	/* h_errno was set by getanswer() */
-#ifdef SUNSECURITY
-	/*
-	 * turn off search as the name should be absolute,
-	 * 'localhost' should be matched by defnames
-	 */
-	strncpy(hname2, hp->h_name, MAXDNAME);
-	hname2[MAXDNAME] = '\0';
-	old_options = _res.options;
-	_res.options &= ~RES_DNSRCH;
-	_res.options |= RES_DEFNAMES;
-	if (!(rhp = gethostbyname(hname2))) {
-		syslog(LOG_NOTICE|LOG_AUTH,
-		       "gethostbyaddr: No A record for %s (verifying [%s])",
-		       hname2, inet_ntoa(*((struct in_addr *)addr)));
-		_res.options = old_options;
-		h_errno = HOST_NOT_FOUND;
+	if (size != len) {
+		errno = EINVAL;
+		h_errno = NETDB_INTERNAL;
 		return (NULL);
 	}
-	_res.options = old_options;
-	for (haddr = rhp->h_addr_list; *haddr; haddr++)
-		if (!memcmp(*haddr, addr, INADDRSZ))
+
+	h_errno = NETDB_SUCCESS;
+	for (i = 0; i < _res_hconf.num_services; ++i) {
+		hp = NULL;
+		switch (_res_hconf.service[i]) {
+		case SERVICE_BIND:
+			switch (af) {
+			case AF_INET:
+				(void) sprintf(qbuf,
+					       "%u.%u.%u.%u.in-addr.arpa",
+					       (uaddr[3] & 0xff),
+					       (uaddr[2] & 0xff),
+					       (uaddr[1] & 0xff),
+					       (uaddr[0] & 0xff));
+				break;
+			case AF_INET6:
+				qp = qbuf;
+				for (n = IN6ADDRSZ - 1; n >= 0; n--) {
+					qp += sprintf(qp, "%x.%x.",
+						      uaddr[n] & 0xf,
+						      (uaddr[n] >> 4) & 0xf);
+				}
+				strcpy(qp, "ip6.int");
+				break;
+			default:
+				abort();
+			}
+			n = res_query(qbuf, C_IN, T_PTR,
+				      (u_char *)buf.buf, sizeof buf.buf);
+			if (n < 0) {
+				dprintf("res_query failed (%d)\n", n);
+				break;
+			}
+			hp = getanswer(&buf, n, qbuf, T_PTR);
+			if (!hp)
+				break;	/* h_errno was set by getanswer() */
+			if (af == AF_INET
+			    && (_res_hconf.flags & HCONF_FLAG_SPOOF)) {
+				/*
+				 * Turn off search as the name should
+				 * be absolute, 'localhost' should be
+				 * matched by defnames
+				 */
+				strncpy(hname2, hp->h_name, MAXDNAME);
+				hname2[MAXDNAME] = '\0';
+				old_options = _res.options;
+				/*
+				 * Also turn off domain trimming to prevent it
+				 * from causing the name comparison to fail.
+				 */
+				old_num_trimdomains =
+					_res_hconf.num_trimdomains;
+				_res.options &= ~RES_DNSRCH;
+				_res.options |= RES_DEFNAMES;
+				rhp = gethostbyname(hname2);
+				_res.options = old_options;
+				/* There must be an A record and
+				   the names must match.  */
+				if (!rhp || strcmp(hname2, rhp->h_name)) {
+					syslog(LOG_NOTICE|LOG_AUTH,
+					       "gethostbyaddr: No A record for"
+					       " %s (verifying [%s])",
+					       hname2,
+					       inet_ntoa(*((struct in_addr *)
+							   addr)));
+					h_errno = HOST_NOT_FOUND;
+					break;
+				}
+				for (haddr = rhp->h_addr_list; *haddr; haddr++)
+					if (!memcmp(*haddr, addr, INADDRSZ))
+						break;
+				if (!*haddr) {
+					syslog(LOG_NOTICE|LOG_AUTH,
+					       "gethostbyaddr: A record of %s"
+					       " != PTR record [%s]",
+					       hname2,
+					       inet_ntoa(*((struct in_addr *)
+							   addr)));
+					h_errno = HOST_NOT_FOUND;
+					break;
+				}
+			}
+			hp->h_addrtype = af;
+			hp->h_length = len;
+			bcopy(addr, host_addr, len);
+			h_addr_ptrs[0] = (char *)host_addr;
+			h_addr_ptrs[1] = NULL;
+			if (af == AF_INET && (_res.options & RES_USE_INET6)) {
+				map_v4v6_address((char*)host_addr,
+						 (char*)host_addr);
+				hp->h_addrtype = AF_INET6;
+				hp->h_length = IN6ADDRSZ;
+			}
+			h_errno = NETDB_SUCCESS;
 			break;
-	if (!*haddr) {
-		syslog(LOG_NOTICE|LOG_AUTH,
-		       "gethostbyaddr: A record of %s != PTR record [%s]",
-		       hname2, inet_ntoa(*((struct in_addr *)addr)));
-		h_errno = HOST_NOT_FOUND;
-		return (NULL);
+
+		case SERVICE_HOSTS:
+			hp = _gethtbyaddr(addr, len, af);
+			break;
+
+#ifdef HAVE_NYS
+		case SERVICE_NIS:
+			if (af == AF_INET) {
+				sprintf(qbuf, "%u.%u.%u.%u",
+					(unsigned)addr[0] & 0xff,
+					(unsigned)addr[1] & 0xff,
+					(unsigned)addr[2] & 0xff,
+					(unsigned)addr[3] & 0xff);
+				hp = _getnishost(qbuf, "hosts.byaddr");
+			}
+			break;
+#endif
+
+		default:
+			break;
+		}
+		if (hp) {
+			_res_hconf_trim_domains(hp);
+			return hp;
+		}
 	}
-#endif /*SUNSECURITY*/
-	hp->h_addrtype = type;
-	hp->h_length = len;
-	h_addr_ptrs[0] = (char *)&host_addr;
-	h_addr_ptrs[1] = NULL;
-	host_addr = *(struct in_addr *)addr;
-	h_errno = NETDB_SUCCESS;
-	return (hp);
+	if (h_errno == NETDB_SUCCESS)
+		h_errno = HOST_NOT_FOUND;
+	return NULL;
 }
 
 void
@@ -612,12 +750,13 @@ _gethtent()
 {
 	char *p;
 	register char *cp, **q;
+	int af, len;
 
 	if (!hostf && !(hostf = fopen(_PATH_HOSTS, "r" ))) {
 		h_errno = NETDB_INTERNAL;
 		return (NULL);
 	}
-again:
+ again:
 	if (!(p = fgets(hostbuf, sizeof hostbuf, hostf))) {
 		h_errno = HOST_NOT_FOUND;
 		return (NULL);
@@ -630,18 +769,27 @@ again:
 	if (!(cp = strpbrk(p, " \t")))
 		goto again;
 	*cp++ = '\0';
-	/* THIS STUFF IS INTERNET SPECIFIC */
-	if (!inet_aton(p, &host_addr))
+	if ((_res.options & RES_USE_INET6) &&
+	    inet_pton(AF_INET6, p, host_addr, sizeof host_addr) > 0) {
+		af = AF_INET6;
+		len = IN6ADDRSZ;
+	} else if (inet_pton(AF_INET, p, host_addr, sizeof host_addr) > 0) {
+		if (_res.options & RES_USE_INET6) {
+			map_v4v6_address((char*)&host_addr, (char*)&host_addr);
+			af = AF_INET6;
+			len = IN6ADDRSZ;
+		} else {
+			af = AF_INET;
+			len = INADDRSZ;
+		}
+	} else {
 		goto again;
+	}
 	h_addr_ptrs[0] = (char *)&host_addr;
 	h_addr_ptrs[1] = NULL;
-#if BSD >= 43 || defined(h_addr)	/* new-style hostent structure */
 	host.h_addr_list = h_addr_ptrs;
-#else
-	host.h_addr = h_addr_ptrs[0];
-#endif
-	host.h_length = INT32SZ;
-	host.h_addrtype = AF_INET;
+	host.h_length = len;
+	host.h_addrtype = af;
 	while (*cp == ' ' || *cp == '\t')
 		cp++;
 	host.h_name = cp;
@@ -659,45 +807,275 @@ again:
 			*cp++ = '\0';
 	}
 	*q = NULL;
+	if (_res.options & RES_USE_INET6) {
+		char *bp = hostbuf;
+		int buflen = sizeof hostbuf;
+
+		map_v4v6_hostent(&host, &bp, &buflen);
+	}
 	h_errno = NETDB_SUCCESS;
 	return (&host);
 }
 
+struct hstorage {
+	char	name[MAXHOSTNAMELEN + 1];	/* canonical name */
+	char **	alp;				/* address list pointer */
+	char *	abp;				/* address buffer pointer */
+	char *	addr_list[MAXADDRS + 1];	/* address list storage */
+	char	addr_buf[MAXADDRBUFSIZE];	/* addresses storage */
+};
+
+static void
+append_addr (struct hstorage * hs, struct hostent *p)
+{
+	if (hs->alp < hs->addr_list + MAXADDRS
+	    && hs->abp + p->h_length < hs->addr_buf + MAXADDRBUFSIZE)
+	{
+		hs->alp[0] = hs->abp;
+		hs->alp[1] = 0;
+		memcpy(hs->abp, p->h_addr_list[0], p->h_length);
+		hs->abp += p->h_length;
+		++hs->alp;
+	}
+}
+
+/*
+ * Lookup IP address and aliases for host NAME.  If multiaddress mode
+ * is enabled, the entire /etc/hosts file is searched and the union of
+ * all addresses found for NAME is returned (this may be slow with
+ * large /etc/hosts files, but is convenient for smallish sites that
+ * don't want to go through the complexity of running named locally).
+ * If multiaddress mode is enabled, the address returned in
+ * h_addr_list[0] is one that is on the same net as one of the host's
+ * local addresses (if such an address exists).  For compatibility
+ * with the BIND version of gethostbyname(), the alias field is empty
+ * unless the name being looked up is an alias itself.  In the latter
+ * case, the name field contains the canonical name and the alias
+ * field the name that is being looked up.  A difference from the BIND
+ * version is that this is true even if the alias applies only to one
+ * of the interfaces on the target host.o
+ */
 struct hostent *
 _gethtbyname(name)
-	char *name;
+	const char *name;
+{
+	extern struct hostent *_gethtbyname2 __P((const char *, int));
+	struct hostent *hp;
+
+	if (_res.options & RES_USE_INET6) {
+		hp = _gethtbyname2(name, AF_INET6);
+		if (hp)
+			return (hp);
+	}
+	return (_gethtbyname2(name, AF_INET));
+}
+
+struct hostent *
+_gethtbyname2(name, af)
+	const char *name;
+	int af;
 {
 	register struct hostent *p;
 	register char **cp;
-	
+
 	_sethtent(0);
-	while (p = _gethtent()) {
-		if (strcasecmp(p->h_name, name) == 0)
-			break;
-		for (cp = p->h_aliases; *cp != 0; cp++)
-			if (strcasecmp(*cp, name) == 0)
-				goto found;
+
+	if (_res_hconf.flags & HCONF_FLAG_MULTI) {
+		/*
+		 * More statics; not pretty, but it would require
+		 * interface changes to make these functions
+		 * reentrant.
+		 */
+		static char * aliases[2];
+		static char alias[MAXHOSTNAMELEN + 1];
+		static struct hstorage self, target;
+		static struct hostent ht;
+		int found;
+
+		aliases[0] = aliases[1] = 0;
+
+		gethostname(self.name, sizeof(self.name));
+		self.alp = self.addr_list;
+		self.abp = self.addr_buf;
+
+		strncpy(target.name, name, MAXHOSTNAMELEN);
+		target.name[MAXHOSTNAMELEN] = '\0';
+		target.alp = target.addr_list;
+		target.abp = target.addr_buf;
+
+		_sethtent(0);
+		while ((p = _gethtent()) != 0) {
+			found = 1;
+
+			if (p->h_addrtype != af)
+				continue;
+			if (strcasecmp(p->h_name, name) != 0) {
+				found = 0;
+				for (cp = p->h_aliases; *cp; ++cp)
+					if (strcasecmp(*cp, name) == 0) {
+						found = 1;
+						if (!aliases[0]) {
+							strcpy(target.name,
+							       p->h_name);
+							strncpy(alias, name,
+								MAXHOSTNAMELEN);
+							alias[MAXHOSTNAMELEN]
+								= '\0';
+							aliases[0] = alias;
+						}
+						break;
+					}
+			}
+			if (found) {
+				/* they better be all the same type and length! */
+				ht.h_addrtype = p->h_addrtype;
+				ht.h_length = p->h_length;
+				append_addr(&target, p);
+				/*
+				 * If the current hostentry is for the target host, we don't
+				 * check for the local host name.  This nicely optimizes the
+				 * case where NAME is a local name since address ordering
+				 * doesn't matter in that case.
+				 */
+				continue;
+			}
+			found = 1;
+			if (strcasecmp(p->h_name, self.name) != 0) {
+				found = 0;
+				for (cp = p->h_aliases; *cp; ++cp)
+					if (strcasecmp(*cp, self.name) == 0) {
+						found = 1;
+						break;
+					}
+			}
+			if (found) {
+				append_addr(&self, p);
+			}
+		}
+		_endhtent();
+
+		if (target.alp == target.addr_list)
+			return NULL;		/* found nothing */
+
+		ht.h_aliases   = aliases;
+		ht.h_name      = target.name;
+		ht.h_addr_list = target.addr_list;
+		/*
+		 * XXX (davidm) Isn't this subsumed by REORDER???
+		 *
+		 * Finding the `best' address is necessarily address
+		 * specific.  For now, we do IPv4 addresses only.
+		 */
+		if (af == AF_INET) {
+			u_int32_t a1, a2, diff, mindiff = ~0;
+			int i, j, bestaddr = 0;
+
+			for (i = 0; self.addr_list[i]; ++i) {
+				for (j = 0; target.addr_list[j]; ++j) {
+					memcpy(&a1, self.addr_list[i], 4);
+					memcpy(&a2, target.addr_list[j], 4);
+					a1 = ntohl(a1);
+					a2 = ntohl(a2);
+					diff = a1 ^ a2;
+					if (diff < mindiff) {
+						bestaddr = j;
+						mindiff = diff;
+					}
+				}
+			}
+			if (bestaddr > 0) {
+				char * tmp;
+
+				tmp = target.addr_list[0];
+				target.addr_list[0] = target.addr_list[bestaddr];
+				target.addr_list[bestaddr] = tmp;
+			}
+		} else if (af == AF_INET6) {
+			/* XXX To do!!! */
+		}
+		ht.h_addr_list = target.addr_list;
+		return &ht;
+	} else {
+		_sethtent(0);
+		while (p = _gethtent()) {
+			if (p->h_addrtype != af)
+				continue;
+			if (strcasecmp(p->h_name, name) == 0)
+				break;
+			for (cp = p->h_aliases; *cp != 0; cp++)
+				if (strcasecmp(*cp, name) == 0)
+					goto found;
+		}
 	}
-found:
+ found:
 	_endhtent();
 	return (p);
 }
 
 struct hostent *
-_gethtbyaddr(addr, len, type)
+_gethtbyaddr(addr, len, af)
 	const char *addr;
-	int len, type;
+	int len, af;
 {
 	register struct hostent *p;
 
 	_sethtent(0);
 	while (p = _gethtent())
-		if (p->h_addrtype == type && !bcmp(p->h_addr, addr, len))
+		if (p->h_addrtype == af && !bcmp(p->h_addr, addr, len))
 			break;
 	_endhtent();
 	return (p);
 }
 
+static void
+map_v4v6_address(src, dst)
+	const char *src;
+	char *dst;
+{
+	u_char *p = (u_char *)dst;
+	char tmp[INADDRSZ];
+	int i;
+
+	/* Stash a temporary copy so our caller can update in place. */
+	bcopy(src, tmp, INADDRSZ);
+	/* Mark this ipv6 addr as a mapped ipv4. */
+	for (i = 0; i < 10; i++)
+		*p++ = 0x00;
+	*p++ = 0xff;
+	*p++ = 0xff;
+	/* Retrieve the saved copy and we're done. */
+	bcopy(tmp, (void*)p, INADDRSZ);
+}
+
+static void
+map_v4v6_hostent(hp, bpp, lenp)
+	struct hostent *hp;
+	char **bpp;
+	int *lenp;
+{
+	char **ap;
+
+	if (hp->h_addrtype != AF_INET || hp->h_length != INADDRSZ)
+		return;
+	hp->h_addrtype = AF_INET6;
+	hp->h_length = IN6ADDRSZ;
+	for (ap = hp->h_addr_list; *ap; ap++) {
+		int i = sizeof(align) - ((u_long)*bpp % sizeof(align));
+
+		if (*lenp < (i + IN6ADDRSZ)) {
+			/* Out of memory.  Truncate address list here.  XXX */
+			*ap = NULL;
+			return;
+		}
+		*bpp += i;
+		*lenp -= i;
+		map_v4v6_address(*ap, *bpp);
+		*ap = *bpp;
+		*bpp += IN6ADDRSZ;
+		*lenp -= IN6ADDRSZ;
+	}
+}
+
 #ifdef RESOLVSORT
 static void
 addrsort(ap, num)
@@ -712,7 +1090,7 @@ addrsort(ap, num)
 	p = ap;
 	for (i = 0; i < num; i++, p++) {
 	    for (j = 0 ; (unsigned)j < _res.nsort; j++)
-		if (_res.sort_list[j].addr.s_addr == 
+		if (_res.sort_list[j].addr.s_addr ==
 		    (((struct in_addr *)(*p))->s_addr & _res.sort_list[j].mask))
 			break;
 	    aval[i] = j;
@@ -766,17 +1144,57 @@ ht_gethostbyname(name)
 }
 
 struct hostent *
-ht_gethostbyaddr(addr, len, type)
+ht_gethostbyaddr(addr, len, af)
 	const char *addr;
-	int len, type;
+	int len, af;
 {
-	return (_gethtbyaddr(addr, len, type));
+	return (_gethtbyaddr(addr, len, af));
 }
 
 struct hostent *
 gethostent()
 {
-	return (_gethtent());
+	struct hostent * hp;
+	int i;
+
+	if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
+		h_errno = NETDB_INTERNAL;
+		return (NULL);
+	}
+
+	/*
+	 * This doesn't look quite right.  Shouldn't we read one
+	 * service until it returns 0, then move on to the next
+	 * service?  If so, it requires adding some state and
+	 * initializing that state in sethostent().
+	 * (davidm@azstarnet.com)
+	 */
+	for (i = 0; i < _res_hconf.num_services; ++i) {
+		hp = NULL;
+		switch (_res_hconf.service[i]) {
+		      case SERVICE_HOSTS:
+			hp = _gethtent ();
+			break;
+
+#ifdef HAVE_NYS
+		      case SERVICE_NIS:
+			hp = _getnishost (NULL, "hosts.byname");
+			break;
+#endif
+
+		      case SERVICE_BIND:
+		      default:
+			break;
+		}
+		if (hp) {
+			if ((_res_hconf.flags & HCONF_FLAG_REORDER)
+			    && hp->h_addr_list[0] && hp->h_addr_list[1])
+				_res_hconf_reorder_addrs (hp);
+			return hp;
+		}
+	}
+	h_errno = HOST_NOT_FOUND;
+	return NULL;
 }
 
 void
diff --git a/resolv/getnetnamadr.c b/resolv/getnetnamadr.c
index fad2b8c0cd..9739995e36 100644
--- a/resolv/getnetnamadr.c
+++ b/resolv/getnetnamadr.c
@@ -139,7 +139,7 @@ static	char *net_aliases[MAXALIASES], netbuf[BUFSIZ+1];
 	haveanswer = 0;
 	while (--ancount >= 0 && cp < eom) {
 		n = dn_expand(answer->buf, eom, cp, bp, buflen);
-		if ((n < 0) || !dn_isvalid(bp))
+		if ((n < 0) || !res_dnok(bp))
 			break;
 		cp += n;
 		ans[0] = '\0';
@@ -209,7 +209,7 @@ getnetbyaddr(net, net_type)
 	int nn, anslen;
 	querybuf buf;
 	char qbuf[MAXDNAME];
-	u_int32_t net2;
+	u_int32_t net2;		/* Changed from unsigned long --roland */
 	struct netent *net_entry;
 
 	if (net_type != AF_INET)
diff --git a/resolv/inet_addr.c b/resolv/inet_addr.c
index bcf7f0d336..2caf747acf 100644
--- a/resolv/inet_addr.c
+++ b/resolv/inet_addr.c
@@ -3,7 +3,7 @@
  * -
  * Copyright (c) 1983, 1990, 1993
  *    The Regents of the University of California.  All rights reserved.
- * 
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ -19,7 +19,7 @@
  * 4. Neither the name of the University nor the names of its contributors
  *    may be used to endorse or promote products derived from this software
  *    without specific prior written permission.
- * 
+ *
  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
@@ -33,14 +33,14 @@
  * SUCH DAMAGE.
  * -
  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
- * 
+ *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
  * copyright notice and this permission notice appear in all copies, and that
  * the name of Digital Equipment Corporation not be used in advertising or
  * publicity pertaining to distribution of the document or software without
  * specific, written prior permission.
- * 
+ *
  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
@@ -70,7 +70,7 @@ static char rcsid[] = "$Id$";
  * Ascii internet address interpretation routine.
  * The value returned is in network order.
  */
-u_int32_t
+u_long
 inet_addr(cp)
 	register const char *cp;
 {
@@ -81,7 +81,7 @@ inet_addr(cp)
 	return (INADDR_NONE);
 }
 
-/* 
+/*
  * Check whether "cp" is a valid ascii representation
  * of an Internet address and convert to a binary address.
  * Returns 1 if the address is valid, 0 if not.
@@ -93,7 +93,7 @@ inet_aton(cp, addr)
 	register const char *cp;
 	struct in_addr *addr;
 {
-	register u_int32_t val;
+	register u_int32_t val;	/* changed from u_long --david */
 	register int base, n;
 	register char c;
 	u_int parts[4];
diff --git a/resolv/inet_ntop.c b/resolv/inet_ntop.c
new file mode 100644
index 0000000000..71db06d845
--- /dev/null
+++ b/resolv/inet_ntop.c
@@ -0,0 +1,189 @@
+/* Copyright (c) 1996 by Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
+ * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
+ * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+ * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+ * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+ * SOFTWARE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char rcsid[] = "$Id$";
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <arpa/nameser.h>
+#include <string.h>
+#include <errno.h>
+#include <stdio.h>
+#include "../conf/portability.h"
+
+/*
+ * WARNING: Don't even consider trying to compile this on a system where
+ * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
+ */
+
+static const char *inet_ntop4 __P((const u_char *src, char *dst, size_t size));
+static const char *inet_ntop6 __P((const u_char *src, char *dst, size_t size));
+
+/* char *
+ * inet_ntop(af, src, dst, size)
+ *	convert a network format address to presentation format.
+ * return:
+ *	pointer to presentation format address (`dst'), or NULL (see errno).
+ * author:
+ *	Paul Vixie, 1996.
+ */
+const char *
+inet_ntop(af, src, dst, size)
+	int af;
+	const void *src;
+	char *dst;
+	size_t size;
+{
+	switch (af) {
+	case AF_INET:
+		return (inet_ntop4(src, dst, size));
+	case AF_INET6:
+		return (inet_ntop6(src, dst, size));
+	default:
+		errno = EAFNOSUPPORT;
+		return (NULL);
+	}
+	/* NOTREACHED */
+}
+
+/* const char *
+ * inet_ntop4(src, dst, size)
+ *	format an IPv4 address, more or less like inet_ntoa()
+ * return:
+ *	`dst' (as a const)
+ * notes:
+ *	(1) uses no statics
+ *	(2) takes a u_char* not an in_addr as input
+ * author:
+ *	Paul Vixie, 1996.
+ */
+static const char *
+inet_ntop4(src, dst, size)
+	const u_char *src;
+	char *dst;
+	size_t size;
+{
+	static const char fmt[] = "%u.%u.%u.%u";
+	char tmp[sizeof "255.255.255.255"];
+
+	if (sprintf(tmp, fmt, src[0], src[1], src[2], src[3]) > size) {
+		errno = ENOSPC;
+		return (NULL);
+	}
+	strcpy(dst, tmp);
+	return (dst);
+}
+
+/* const char *
+ * inet_ntop6(src, dst, size)
+ *	convert IPv6 binary address into presentation (printable) format
+ * author:
+ *	Paul Vixie, 1996.
+ */
+static const char *
+inet_ntop6(src, dst, size)
+	const u_char *src;
+	char *dst;
+	size_t size;
+{
+	/*
+	 * Note that int32_t and int16_t need only be "at least" large enough
+	 * to contain a value of the specified size.  On some systems, like
+	 * Crays, there is no such thing as an integer variable with 16 bits.
+	 * Keep this in mind if you think this function should have been coded
+	 * to use pointer overlays.  All the world's not a VAX.
+	 */
+	char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp;
+	struct { int base, len; } best, cur;
+	u_int words[IN6ADDRSZ / INT16SZ];
+	int i;
+
+	/*
+	 * Preprocess:
+	 *	Copy the input (bytewise) array into a wordwise array.
+	 *	Find the longest run of 0x00's in src[] for :: shorthanding.
+	 */
+	bzero(words, sizeof words);
+	for (i = 0; i < IN6ADDRSZ; i++)
+		words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3));
+	best.base = -1;
+	cur.base = -1;
+	for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++) {
+		if (words[i] == 0) {
+			if (cur.base == -1)
+				cur.base = i, cur.len = 1;
+			else
+				cur.len++;
+		} else {
+			if (cur.base != -1) {
+				if (best.base == -1 || cur.len > best.len)
+					best = cur;
+				cur.base = -1;
+			}
+		}
+	}
+	if (cur.base != -1) {
+		if (best.base == -1 || cur.len > best.len)
+			best = cur;
+	}
+	if (best.base != -1 && best.len < 2)
+		best.base = -1;
+
+	/*
+	 * Format the result.
+	 */
+	tp = tmp;
+	for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++) {
+		/* Are we inside the best run of 0x00's? */
+		if (best.base != -1 && i >= best.base &&
+		    i < (best.base + best.len)) {
+			if (i == best.base)
+				*tp++ = ':';
+			continue;
+		}
+		/* Are we following an initial run of 0x00s or any real hex? */
+		if (i != 0)
+			*tp++ = ':';
+		/* Is this address an encapsulated IPv4? */
+		if (i == 6 && best.base == 0 &&
+		    (best.len == 6 || (best.len == 5 && words[5] == 0xffff))) {
+			if (!inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp)))
+				return (NULL);
+			tp += strlen(tp);
+			break;
+		}
+		tp += sprintf(tp, "%x", words[i]);
+	}
+	/* Was it a trailing run of 0x00's? */
+	if (best.base != -1 && (best.base + best.len) == (IN6ADDRSZ / INT16SZ))
+		*tp++ = ':';
+	*tp++ = '\0';
+
+	/*
+	 * Check for overflow, copy, and we're done.
+	 */
+	if ((tp - tmp) > size) {
+		errno = ENOSPC;
+		return (NULL);
+	}
+	strcpy(dst, tmp);
+	return (dst);
+}
diff --git a/resolv/inet_pton.c b/resolv/inet_pton.c
new file mode 100644
index 0000000000..385dc25337
--- /dev/null
+++ b/resolv/inet_pton.c
@@ -0,0 +1,223 @@
+/* Copyright (c) 1996 by Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
+ * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
+ * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+ * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+ * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+ * SOFTWARE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char rcsid[] = "$Id$";
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <arpa/nameser.h>
+#include <string.h>
+#include <errno.h>
+#include "../conf/portability.h"
+
+/*
+ * WARNING: Don't even consider trying to compile this on a system where
+ * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
+ */
+
+static int	inet_pton4 __P((const char *src, u_char *dst));
+static int	inet_pton6 __P((const char *src, u_char *dst));
+
+/* int
+ * inet_pton(af, src, dst, size)
+ *	convert from presentation format (which usually means ASCII printable)
+ *	to network format (which is usually some kind of binary format).
+ * return:
+ *	1 if the address was valid for the specified address family
+ *	0 if the address wasn't valid (`dst' is untouched in this case)
+ *	-1 if some other error occurred (`dst' is untouched in this case, too)
+ * author:
+ *	Paul Vixie, 1996.
+ */
+int
+inet_pton(af, src, dst, size)
+	int af;
+	const char *src;
+	void *dst;
+	size_t size;
+{
+	switch (af) {
+	case AF_INET:
+		if (size < INADDRSZ) {
+			errno = ENOSPC;
+			return (-1);
+		}
+		return (inet_pton4(src, dst));
+	case AF_INET6:
+		if (size < IN6ADDRSZ) {
+			errno = ENOSPC;
+			return (-1);
+		}
+		return (inet_pton6(src, dst));
+	default:
+		errno = EINVAL;
+		return (-1);
+	}
+	/* NOTREACHED */
+}
+
+/* int
+ * inet_pton4(src, dst)
+ *	like inet_pton() but without all the hexadecimal and shorthand.
+ * return:
+ *	1 if `src' is a valid dotted quad, else 0.
+ * notice:
+ *	does not touch `dst' unless it's returning 1.
+ * author:
+ *	Paul Vixie, 1996.
+ */
+static int
+inet_pton4(src, dst)
+	const char *src;
+	u_char *dst;
+{
+	static const char digits[] = "0123456789";
+	int saw_digit, octets, ch;
+	u_char tmp[INADDRSZ], *tp;
+
+	saw_digit = 0;
+	octets = 0;
+	*(tp = tmp) = 0;
+	while ((ch = *src++) != '\0') {
+		const char *pch;
+
+		if ((pch = strchr(digits, ch)) != NULL) {
+			u_int new = *tp * 10 + (pch - digits);
+
+			if (new > 255)
+				return (0);
+			*tp = new;
+			if (! saw_digit) {
+				if (++octets > 4)
+					return (0);
+				saw_digit = 1;
+			}
+		} else if (ch == '.' && saw_digit) {
+			if (octets == 4)
+				return (0);
+			*++tp = 0;
+			saw_digit = 0;
+		} else
+			return (0);
+	}
+	if (octets < 4)
+		return (0);
+	bcopy(tmp, dst, INADDRSZ);
+	return (1);
+}
+
+/* int
+ * inet_pton6(src, dst)
+ *	convert presentation level address to network order binary form.
+ * return:
+ *	1 if `src' is a valid [RFC1884 2.2] address, else 0.
+ * notice:
+ *	(1) does not touch `dst' unless it's returning 1.
+ *	(2) :: in a full address is silently ignored.
+ * credit:
+ *	inspired by Mark Andrews.
+ * author:
+ *	Paul Vixie, 1996.
+ */
+static int
+inet_pton6(src, dst)
+	const char *src;
+	u_char *dst;
+{
+	static const char xdigits_l[] = "0123456789abcdef",
+			  xdigits_u[] = "0123456789ABCDEF";
+	u_char tmp[IN6ADDRSZ], *tp, *endp, *colonp;
+	const char *xdigits, *curtok;
+	int ch, saw_xdigit;
+	u_int val;
+
+	bzero((tp = tmp), IN6ADDRSZ);
+	endp = tp + IN6ADDRSZ;
+	colonp = NULL;
+	/* Leading :: requires some special handling. */
+	if (*src == ':')
+		if (*++src != ':')
+			return (0);
+	curtok = src;
+	saw_xdigit = 0;
+	val = 0;
+	while ((ch = *src++) != '\0') {
+		const char *pch;
+
+		if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
+			pch = strchr((xdigits = xdigits_u), ch);
+		if (pch != NULL) {
+			val <<= 4;
+			val |= (pch - xdigits);
+			if (val > 0xffff)
+				return (0);
+			saw_xdigit = 1;
+			continue;
+		}
+		if (ch == ':') {
+			curtok = src;
+			if (!saw_xdigit) {
+				if (colonp)
+					return (0);
+				colonp = tp;
+				continue;
+			}
+			if (tp + INT16SZ > endp)
+				return (0);
+			*tp++ = (u_char) (val >> 8) & 0xff;
+			*tp++ = (u_char) val & 0xff;
+			saw_xdigit = 0;
+			val = 0;
+			continue;
+		}
+		if (ch == '.' && ((tp + INADDRSZ) <= endp) &&
+		    inet_pton4(curtok, tp) > 0) {
+			tp += INADDRSZ;
+			saw_xdigit = 0;
+			break;	/* '\0' was seen by inet_pton4(). */
+		}
+		return (0);
+	}
+	if (saw_xdigit) {
+		if (tp + INT16SZ > endp)
+			return (0);
+		*tp++ = (u_char) (val >> 8) & 0xff;
+		*tp++ = (u_char) val & 0xff;
+	}
+	if (colonp != NULL) {
+		/*
+		 * Since some memmove()'s erroneously fail to handle
+		 * overlapping regions, we'll do the shift by hand.
+		 */
+		const howmany = tp - colonp;
+		int i;
+
+		for (i = 1; i <= howmany; i++) {
+			endp[- i] = colonp[howmany - i];
+			colonp[howmany - i] = 0;
+		}
+		tp = endp;
+	}
+	if (tp != endp)
+		return (0);
+	bcopy(tmp, dst, IN6ADDRSZ);
+	return (1);
+}
diff --git a/resolv/res_comp.c b/resolv/res_comp.c
index f234772e41..e105dbb0b6 100644
--- a/resolv/res_comp.c
+++ b/resolv/res_comp.c
@@ -3,7 +3,7 @@
  * -
  * Copyright (c) 1985, 1993
  *    The Regents of the University of California.  All rights reserved.
- * 
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ -19,7 +19,7 @@
  * 4. Neither the name of the University nor the names of its contributors
  *    may be used to endorse or promote products derived from this software
  *    without specific prior written permission.
- * 
+ *
  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
@@ -33,14 +33,14 @@
  * SUCH DAMAGE.
  * -
  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
- * 
+ *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
  * copyright notice and this permission notice appear in all copies, and that
  * the name of Digital Equipment Corporation not be used in advertising or
  * publicity pertaining to distribution of the document or software without
  * specific, written prior permission.
- * 
+ *
  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
@@ -343,7 +343,7 @@ dn_find(exp_dn, msg, dnptrs, lastdnptr)
 /****
 To: "Lawrence R. Rogers" <lrr@cert.org>
 cc: cert@cert.org, pvm@home.net
-Subject: Re: VU#14542 
+Subject: Re: VU#14542
 In-reply-to: Your message of "Mon, 19 Feb 1996 17:16:27 PST."
 Date: Tue, 20 Feb 1996 22:37:21 -0800
 From: Paul A Vixie <vixie@wisdom.home.vix.com>
@@ -359,7 +359,7 @@ in retrospect,
 should have been
 
 	hostname = label ( "." label )+
-	firstchar = [a-zA-Z0-9_]
+	firstchar = [a-zA-Z0-9]
 	otherchar = [a-zA-Z0-9_-]
 	label = firstchar otherchar*
 
@@ -368,53 +368,98 @@ earlier.  since i'm only trying to bend the spec to fit actual known uses,
 i should not have widened the rules as far as i did earlier.
 ****/
 
-#define firstchar(c) ((isascii(c) && isalnum(c)) || (c) == '_')
-#define otherchar(c) (firstchar(c) || (c) == '-')
-#define	wildlabel(firstlabel, ch, nch) \
-	((firstlabel) && (ch) == '*' && ((nch) == '.' || (nch) == '\0'))
+/*
+ * Note the conspicuous absence of ctype macros in these definitions.  On
+ * non-ASCII hosts, we can't depend on string literals or ctype macros to
+ * tell us anything about network-format data.  The rest of the BIND system
+ * is not careful about this, but for some reason, we're doing it right here.
+ */
+#define PERIOD 0x2e
+#define	hyphenchar(c) ((c) == 0x2d)
+#define bslashchar(c) ((c) == 0x5c)
+#define periodchar(c) ((c) == PERIOD)
+#define asterchar(c) ((c) == 0x2a)
+#define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) \
+		   || ((c) >= 0x61 && (c) <= 0x7a))
+#define digitchar(c) ((c) >= 0x30 && (c) <= 0x39)
+
+#define borderchar(c) (alphachar(c) || digitchar(c))
+#define middlechar(c) (borderchar(c) || hyphenchar(c))
+#define	domainchar(c) ((c) > 0x20 && (c) < 0x7f)
 
 int
 res_hnok(dn)
 	const char *dn;
 {
-	int ppch = '\0', pch = '.', ch = *dn++, firstlabel = 1;
+	int ppch = '\0', pch = PERIOD, ch = *dn++;
 
 	while (ch != '\0') {
 		int nch = *dn++;
 
-		if (ch == '.' || (ch == '\\' && nch == '.')) {
+		if (periodchar(ch)) {
 			NULL;
-		} else if (pch == '.' && ppch != '\\') {
-			if (!firstchar(ch) && !wildlabel(firstlabel, ch, nch))
+		} else if (periodchar(pch)) {
+			if (!borderchar(ch))
+				return (0);
+		} else if (periodchar(nch) || nch == '\0') {
+			if (!borderchar(ch))
 				return (0);
 		} else {
-			if (!otherchar(ch))
+			if (!middlechar(ch))
 				return (0);
 		}
 		ppch = pch, pch = ch, ch = nch;
-		firstlabel = 0;
 	}
 	return (1);
 }
 
 /*
+ * hostname-like (A, MX, WKS) owners can have "*" as their first label
+ * but must otherwise be as a host name.
+ */
+int
+res_ownok(dn)
+	const char *dn;
+{
+	if (asterchar(dn[0]) && periodchar(dn[1]))
+		dn += 2;
+	return (res_hnok(dn));
+}
+
+/*
+ * SOA RNAMEs and RP RNAMEs can have any printable character in their first
+ * label, but the rest of the name has to look like a host name.
+ */
+int
+res_mailok(dn)
+	const char *dn;
+{
+	int ch, pch;
+
+	pch = '\0';
+	while ((ch = *dn++) != '\0') {
+		if (!domainchar(ch))
+			return (0);
+		if (periodchar(ch) && !bslashchar(pch))
+			break;
+		pch = ch;
+	}
+	return (res_hnok(dn));
+}
+
+/*
  * This function is quite liberal, since RFC 1034's character sets are only
  * recommendations.
- *
- * Note that some char's are signed, so we have to cast to unsigned.
  */
 int
-dn_isvalid(dn)
+res_dnok(dn)
 	const char *dn;
 {
-	unsigned char *t = (unsigned char *)dn;
 	int ch;
 
-	while ((ch = *t++) != '\0')
-		if (ch <= 0x1f || ch >= 0x7f) {
-			/* Unprintable in ASCII. */
+	while ((ch = *dn++) != '\0')
+		if (!domainchar(ch))
 			return (0);
-		}
 	return (1);
 }
 
@@ -498,7 +543,7 @@ putlong(l, msgp)
 {
 	__putlong(l, msgp);
 }
- 
+
 #undef dn_skipname
 dn_skipname(comp_dn, eom)
 	const u_char *comp_dn, *eom;
diff --git a/resolv/res_debug.c b/resolv/res_debug.c
index 85ec628b89..4f55804497 100644
--- a/resolv/res_debug.c
+++ b/resolv/res_debug.c
@@ -3,7 +3,7 @@
  * -
  * Copyright (c) 1985, 1990, 1993
  *    The Regents of the University of California.  All rights reserved.
- * 
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ -19,7 +19,7 @@
  * 4. Neither the name of the University nor the names of its contributors
  *    may be used to endorse or promote products derived from this software
  *    without specific prior written permission.
- * 
+ *
  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
@@ -33,14 +33,14 @@
  * SUCH DAMAGE.
  * -
  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
- * 
+ *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
  * copyright notice and this permission notice appear in all copies, and that
  * the name of Digital Equipment Corporation not be used in advertising or
  * publicity pertaining to distribution of the document or software without
  * specific, written prior permission.
- * 
+ *
  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
@@ -59,6 +59,8 @@ static char rcsid[] = "$Id$";
 #endif /* LIBC_SCCS and not lint */
 
 #include <sys/param.h>
+#include <sys/types.h>
+#include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <arpa/nameser.h>
@@ -66,7 +68,7 @@ static char rcsid[] = "$Id$";
 #include <stdio.h>
 #include <netdb.h>
 #include <resolv.h>
-#if defined(BSD) && (BSD >= 199103)
+#if defined(BSD) && (BSD >= 199103) && defined(AF_INET6)
 # include <string.h>
 #else
 # include "../conf/portability.h"
@@ -295,7 +297,7 @@ __fp_nquery(msg, len, file)
 		fprintf(file, ", Auth: %d", ntohs(hp->nscount));
 		fprintf(file, ", Addit: %d", ntohs(hp->arcount));
 	}
-	if ((!_res.pfcode) || (_res.pfcode & 
+	if ((!_res.pfcode) || (_res.pfcode &
 		(RES_PRF_HEADX | RES_PRF_HEAD2 | RES_PRF_HEAD1))) {
 		putc('\n',file);
 	}
@@ -590,6 +592,13 @@ __p_rr(cp, msg, file)
 		cp += dlen;
 		break;
 
+	case T_AAAA: {
+		char t[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"];
+
+		fprintf(file, "\t%s\n", inet_ntop(AF_INET6, cp, t, sizeof t));
+		break;
+	}
+
 	case T_MINFO:
 	case T_RP:
 		putc('\t', file);
diff --git a/resolv/res_hconf.c b/resolv/res_hconf.c
new file mode 100644
index 0000000000..b08dd3ced7
--- /dev/null
+++ b/resolv/res_hconf.c
@@ -0,0 +1,566 @@
+/* Copyright (C) 1993, 1995, 1996 Free Software Foundation, Inc.
+   Contributed by David Mosberger (davidm@azstarnet.com).
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+/* This file provides a Linux /etc/host.conf compatible front end to
+the various name resolvers (/etc/hosts, named, NIS server, etc.).
+Though mostly compatibly, the following differences exist compared
+to the original implementation:
+
+	- new command "spoof" takes an arguments like RESOLV_SPOOF_CHECK
+	  environment variable (i.e., `off', `nowarn', or `warn').
+
+	- line comments can appear anywhere (not just at the beginning of
+	  a line)
+*/
+#include <ctype.h>
+#include <memory.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "res_hconf.h"
+
+#define _PATH_HOSTCONF	"/etc/host.conf"
+
+/* Environment vars that all user to override default behavior:  */
+#define ENV_HOSTCONF	"RESOLV_HOST_CONF"
+#define ENV_SERVORDER	"RESOLV_SERV_ORDER"
+#define ENV_SPOOF	"RESOLV_SPOOF_CHECK"
+#define ENV_TRIM_OVERR	"RESOLV_OVERRIDE_TRIM_DOMAINS"
+#define ENV_TRIM_ADD	"RESOLV_ADD_TRIM_DOMAINS"
+#define ENV_MULTI	"RESOLV_MULTI"
+#define ENV_REORDER	"RESOLV_REORDER"
+
+static const char * arg_service_list (const char *, int, const char *,
+				      unsigned);
+static const char * arg_trimdomain_list (const char *, int, const char *,
+					 unsigned);
+static const char * arg_spoof (const char *, int, const char *, unsigned);
+static const char * arg_bool (const char *, int, const char *, unsigned);
+
+static struct cmd {
+  const char *	name;
+  const char *	(*parse_args)(const char * filename, int line_num,
+			      const char * args, unsigned arg);
+  unsigned	arg;;
+} cmd[] = {
+  {"order",		arg_service_list,	0},
+  {"trim",		arg_trimdomain_list,	0},
+  {"spoof",		arg_spoof,		0},
+  {"multi",		arg_bool,		HCONF_FLAG_MULTI},
+  {"nospoof",		arg_bool,		HCONF_FLAG_SPOOF},
+  {"spoofalert",	arg_bool,		HCONF_FLAG_SPOOFALERT},
+  {"reorder",		arg_bool,		HCONF_FLAG_REORDER}
+};
+
+
+/*
+ * Why isn't this in stdlib?
+ */
+char *
+strndup (const char * s, size_t n)
+{
+  char * retval;
+
+  retval = malloc (n + 1);
+  if (!retval)
+    return retval;
+
+  memcpy (retval, s, n);
+  retval[n] = '\0';		/* ensure return value is terminated */
+  return retval;
+}
+
+
+/* Skip white space.  */
+static const char *
+skip_ws (const char * str)
+{
+  while (isspace (*str)) ++str;
+  return str;
+}
+
+
+/* Skip until whitespace, comma, end of line, or comment character.  */
+static const char *
+skip_string (const char * str)
+{
+  while (*str && !isspace (*str) && *str != '#' && *str != ',') ++str;
+  return str;
+}
+
+
+static const char *
+arg_service_list (const char * fname, int line_num, const char * args,
+		  unsigned arg)
+{
+  enum Name_Service service;
+  const char * start;
+  size_t len;
+  int i;
+  static struct {
+    const char *	name;
+    enum Name_Service	service;
+  } svcs[] = {
+    {"bind",	SERVICE_BIND},
+    {"hosts",	SERVICE_HOSTS},
+    {"nis",	SERVICE_NIS},
+  };
+
+  do
+    {
+      start = args;
+      args = skip_string (args);
+      len = args - start;
+
+      service = SERVICE_NONE;
+      for (i = 0; i < sizeof (svcs) / sizeof (svcs[0]); ++i)
+	{
+	  if (strncasecmp (start, svcs[i].name, len) == 0
+	      && len == strlen (svcs[i].name))
+	  {
+	    service = svcs[i].service;
+	    break;
+	  }
+      }
+      if (service == SERVICE_NONE)
+	{
+	  fprintf (stderr, "%s: line %d: expected service, found `%s'\n",
+		   fname, line_num, start);
+	  return 0;
+	}
+      if (_res_hconf.num_services >= SERVICE_MAX)
+	{
+	  fprintf (stderr, "%s: line %d: cannot specify more than %d services",
+		   fname, line_num, SERVICE_MAX);
+	  return 0;
+	}
+      _res_hconf.service[_res_hconf.num_services++] = service;
+
+      args = skip_ws (args);
+      switch (*args)
+	{
+	case ',': case ';': case ':':
+	  args = skip_ws (++args);
+	  if (!*args || *args == '#')
+	    {
+	      fprintf (stderr,
+		       "%s: line %d: list delimiter not followed by keyword",
+		       fname, line_num);
+	      return 0;
+	    }
+	default:
+	  break;
+	}
+    }
+  while (*args && *args != '#');
+  return args;
+}
+
+
+static const char *
+arg_trimdomain_list (const char * fname, int line_num, const char * args,
+		     unsigned flag)
+{
+  const char * start;
+  size_t len;
+
+  do
+    {
+      start = args;
+      args = skip_string (args);
+      len = args - start;
+
+      if (_res_hconf.num_trimdomains >= TRIMDOMAINS_MAX)
+	{
+	  fprintf (stderr,
+		   "%s: line %d: cannot specify more than %d trim domains",
+		   fname, line_num, TRIMDOMAINS_MAX);
+	  return 0;
+	}
+      _res_hconf.trimdomain[_res_hconf.num_trimdomains++] =
+	strndup (start, len);
+      args = skip_ws (args);
+      switch (*args)
+	{
+	case ',': case ';': case ':':
+	  args = skip_ws (++args);
+	  if (!*args || *args == '#')
+	    {
+	      fprintf (stderr,
+		       "%s: line %d: list delimiter not followed by domain",
+		       fname, line_num);
+	      return 0;
+	    }
+	default:
+	  break;
+	}
+    }
+  while (*args && *args != '#');
+  return args;
+}
+
+
+static const char *
+arg_spoof (const char * fname, int line_num, const char * args, unsigned flag)
+{
+  const char * start = args;
+  size_t len;
+
+  args = skip_string (args);
+  len = args - start;
+
+  if (len == 3 && strncasecmp (start, "off", len) == 0)
+    _res_hconf.flags &= ~(HCONF_FLAG_SPOOF | HCONF_FLAG_SPOOFALERT);
+  else
+    {
+      _res_hconf.flags |= (HCONF_FLAG_SPOOF | HCONF_FLAG_SPOOFALERT);
+      if ((len == 6 && strncasecmp (start, "nowarn", len) == 0)
+	  || !(len == 4 && strncasecmp (start, "warn", len) == 0))
+	_res_hconf.flags &= ~HCONF_FLAG_SPOOFALERT;
+    }
+  return args;
+}
+
+
+static const char *
+arg_bool (const char * fname, int line_num, const char * args, unsigned flag)
+{
+  if (strncasecmp (args, "on", 2) == 0)
+    {
+      args += 2;
+      _res_hconf.flags |= flag;
+    }
+  else if (strncasecmp (args, "off", 3) == 0)
+    {
+      args += 3;
+      _res_hconf.flags &= ~flag;
+    }
+  else
+    {
+      fprintf (stderr, "%s: line %d: expected `on' or `off', found `%s'\n",
+	       fname, line_num, args);
+      return 0;
+    }
+  return args;
+}
+
+
+static void
+parse_line (const char * fname, int line_num, const char * str)
+{
+  const char * start;
+  struct cmd * c = 0;
+  size_t len;
+  int i;
+
+  str = skip_ws (str);
+
+  if (*str == '#') return;		/* skip line comment */
+
+  start = str;
+  str = skip_string (str);
+  len = str - start;
+
+  for (i = 0; i < sizeof (cmd) / sizeof (cmd[0]); ++i)
+    {
+      if (strncasecmp (start, cmd[i].name, len) == 0
+	  && strlen (cmd[i].name) == len)
+	{
+	  c = &cmd[i];
+	  break;
+	}
+    }
+  if (!c)
+    {
+      fprintf (stderr, "%s: line %d: bad command `%s'\n",
+	       fname, line_num, start);
+      return;
+    }
+
+  /* process args: */
+  str = skip_ws (str);
+  str = (*c->parse_args) (fname, line_num, str, c->arg);
+  if (!str)
+    return;
+
+  /* rest of line must contain white space or comment only: */
+  while (*str)
+    {
+      if (!isspace (*str)) {
+	if (*str != '#')
+	  fprintf (stderr, "%s: line %d: ignoring trailing garbage `%s'\n",
+		   fname, line_num, str);
+	break;
+      }
+      ++str;
+    }
+}
+
+
+/* Initialize hconf datastructure by reading host.conf file and
+   environment variables.  */
+void
+_res_hconf_init (void)
+{
+  const char * hconf_name;
+  int line_num = 0;
+  char buf[256], * end, * envval;
+  FILE * fp;
+
+  memset (&_res_hconf, 0, sizeof (_res_hconf));
+
+  hconf_name = getenv (ENV_HOSTCONF);
+  if (!hconf_name)
+    hconf_name = _PATH_HOSTCONF;
+
+  fp = fopen (hconf_name, "r");
+  if (!fp)
+    /* make up something reasonable: */
+    _res_hconf.service[_res_hconf.num_services++] = SERVICE_BIND;
+  else
+    {
+      while (fgets (buf, sizeof (buf), fp))
+	{
+	  ++line_num;
+	  end = strchr (buf, '\n');
+	  if (end)
+	    *end = '\0';
+	  parse_line (hconf_name, line_num, buf);
+	}
+      fclose (fp);
+    }
+
+  envval = getenv (ENV_SERVORDER);
+  if (envval)
+    {
+      _res_hconf.num_services = 0;
+      arg_service_list (ENV_SERVORDER, 1, envval, 0);
+    }
+
+  envval = getenv (ENV_SPOOF);
+  if (envval)
+    arg_spoof (ENV_SPOOF, 1, envval, 0);
+
+  envval = getenv (ENV_MULTI);
+  if (envval)
+    arg_bool (ENV_MULTI, 1, envval, HCONF_FLAG_MULTI);
+
+  envval = getenv (ENV_REORDER);
+  if (envval)
+    arg_bool (ENV_REORDER, 1, envval, HCONF_FLAG_REORDER);
+
+  envval = getenv (ENV_TRIM_ADD);
+  if (envval)
+    arg_trimdomain_list (ENV_TRIM_ADD, 1, envval, 0);
+
+  envval = getenv (ENV_TRIM_OVERR);
+  if (envval)
+    {
+      _res_hconf.num_trimdomains = 0;
+      arg_trimdomain_list (ENV_TRIM_OVERR, 1, envval, 0);
+    }
+}
+
+
+/* Reorder addresses returned in a hostent such that the first address
+   is an address on the local subnet, if there is such an address.
+   Otherwise, nothing is changed.  */
+
+void
+_res_hconf_reorder_addrs (struct hostent * hp)
+{
+#if defined (SIOCGIFCONF) && defined (SIOCGIFNETMASK)
+  static int num_ifs = -1;	/* number of interfaces */
+  static struct netaddr {
+    int addrtype;
+    union {
+      struct {
+	u_int32_t	addr;
+	u_int32_t	mask;
+      } ipv4
+    } u;
+  } * ifaddrs;
+
+  if (hp->h_addrtype != AF_INET)
+    return;	/* can't deal with anything but IPv4 for now... */
+
+  if (num_ifs <= 0)
+    {
+      struct ifconf ifs;
+      struct ifreq * ifr;
+      size_t size, num;
+      int sd;
+
+      /* initialize interface table: */
+
+      num_ifs = 0;
+
+      sd = socket (AF_INET, SOCK_DGRAM, 0);
+      if (sd < 0)
+	return;
+
+      /* Now get list of interfaces.  Since we don't know how many
+	 interfaces there are, we keep increasing the buffer size
+	 until we have at least sizeof(struct ifreq) too many bytes.
+	 That implies that the ioctl() return because it ran out of
+	 interfaces, not memory */
+      size = 0;
+      ifs.ifc_buf = 0;
+      do {
+	size += 4 * sizeof (struct ifreq);
+	ifs.ifc_buf = realloc (ifs.ifs_buf, size);
+	if (!ifs.ifc_buf)
+	  {
+	    close (sd);
+	    return;
+	  }
+	ifs.ifc_len = size;
+	if (ioctl (sd, SIOCGIFCONF, &ifs) < 0)
+	  goto cleanup;
+      } while (size - ifs.ifc_len < sizeof (struct ifreq));
+
+      num = ifs.ifc_len / sizeof (struct ifreq);
+
+      ifaddrs = malloc (num * sizeof (ifaddrs[0]));
+      if (!ifaddrs)
+	goto cleanup;
+
+      ifr = ifs.ifc_req;
+      for (i = 0; i < num; ++i) {
+	if (ifr->ifr_addr.sa_family != AF_INET)
+	  continue;
+	ifaddrs[num_ifs].addrtype = AF_INET;
+
+	memcpy (&ifaddrs[num_ifs].u.ipv4.addr,
+		&((struct sockaddr_in *)ifr->ifr_addr)->sin_addr, 4);
+
+	if (ioctl (sd, SIOCGIFNETMASK, if) < 0)
+	  continue;
+	memcpy (&ifaddrs[num_ifs].u.ipv4.mask,
+		((struct sockaddr_in *)ifr->ifr_mask)->sin_addr, 4);
+
+	++num_ifs;	/* now we're committed to this entry */
+      }
+      /* just keep enough memory to hold all the interfaces we want: */
+      ifaddrs = realloc (ifaddrs, num_ifs * sizeof (ifaddrs[0]));
+
+    cleanup:
+      close (sd);
+      free (ifs.ifc_buf);
+    }
+
+  if (num_ifs == 0)
+    return;
+
+  /* find an address for which we have a direct connection: */
+  for (i = 0; hp->h_addr_list[i]; ++i)
+    {
+      h_addr = (struct in_addr *) hp->h_addr_list[i];
+
+      for (j = 0; j < num_ifs; ++j)
+	{
+	  if_addr    = ifaddrs[j].u.ipv4.addr;
+	  if_netmask = ifaddrs[j].u.ipv4.mask;
+
+	  if (((h_addr->s_addr ^ if_addr) & if_netmask) == 0)
+	    {
+	      void * tmp;
+
+	      tmp		 = hp->h_addr_list[i];
+	      hp->h_addr_list[i] = hp->h_addr_list[0];
+	      hp->h_addr_list[0] = tmp;
+	      return;
+	    }
+	}
+    }
+#endif /* defined(SIOCGIFCONF) && ... */
+}
+
+
+/* If HOSTNAME has a postfix matching any of the trimdomains, trim away
+   that postfix.  Notice that HOSTNAME is modified inplace.  Also, the
+   original code applied all trimdomains in order, meaning that the
+   same domainname could be trimmed multiple times.  I believe this
+   was unintentional.  */
+void
+_res_hconf_trim_domain (char * hostname)
+{
+  size_t hostname_len, trim_len;
+  int i;
+
+  hostname_len = strlen(hostname);
+
+  for (i = 0; i < _res_hconf.num_trimdomains; ++i)
+    {
+      const char * trim = _res_hconf.trimdomain[i];
+
+      trim_len = strlen(trim);
+      if (hostname_len > trim_len
+	  && strcasecmp(&hostname[hostname_len - trim_len], trim) == 0)
+	{
+	  hostname[hostname_len - trim_len] = '\0';
+	  break;
+	}
+    }
+}
+
+
+/* Trim all hostnames/aliases in HP according to the trimdomain list.
+   Notice that HP is modified inplace!  */
+void
+_res_hconf_trim_domains (struct hostent * hp)
+{
+  int i;
+
+  if (_res_hconf.num_trimdomains == 0)
+    return;
+
+  _res_hconf_trim_domain (hp->h_name);
+  for (i = 0; hp->h_aliases[i]; ++i)
+    _res_hconf_trim_domain (hp->h_aliases[i]);
+}
+
+
+#if 0
+
+struct hostent *
+_hconf_gethostent (void)
+{
+}
+
+
+struct hostent *
+_hconf_gethostbyname (const char * name)
+{
+
+}
+
+
+struct hostent *
+_hconf_gethostbyaddr (const char * addr, int len, int type)
+{
+}
+
+
+struct hostent *
+_hconf_gethtbyname (const char * name)
+{
+}
+
+#endif
diff --git a/resolv/res_hconf.h b/resolv/res_hconf.h
new file mode 100644
index 0000000000..2165e40711
--- /dev/null
+++ b/resolv/res_hconf.h
@@ -0,0 +1,50 @@
+/* Copyright (C) 1993, 1995, 1996 Free Software Foundation, Inc.
+   Contributed by David Mosberger (davidm@azstarnet.com).
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#ifndef _RES_HCONF_H_
+#define _RES_HCONF_H_
+
+#include <netdb.h>
+
+#define TRIMDOMAINS_MAX	4
+
+enum Name_Service {
+  SERVICE_NONE = 0,
+  SERVICE_BIND, SERVICE_HOSTS, SERVICE_NIS,
+  SERVICE_MAX
+};
+
+struct hconf {
+  int			num_services;
+  enum Name_Service	service[SERVICE_MAX];
+  int			num_trimdomains;
+  const char *		trimdomain[TRIMDOMAINS_MAX];
+  unsigned		flags;
+#  define HCONF_FLAG_INITED	(1 << 0) /* initialized? */
+#  define HCONF_FLAG_SPOOF	(1 << 1) /* refuse spoofed addresses */
+#  define HCONF_FLAG_SPOOFALERT	(1 << 2) /* syslog warning of spoofed */
+#  define HCONF_FLAG_REORDER	(1 << 3) /* list best address first */
+#  define HCONF_FLAG_MULTI	(1 << 4) /* see comments for gethtbyname() */
+} _res_hconf;
+
+extern void	_res_hconf_init (void);
+extern void	_res_hconf_trim_domain (char * domain);
+extern void	_res_hconf_trim_domains (struct hostent * hp);
+extern void	_res_hconf_reorder_addrs (struct hostent * hp);
+
+#endif /* _RES_HCONF_H_ */
diff --git a/resolv/res_init.c b/resolv/res_init.c
index 42c7c2ef8c..4e8af680c1 100644
--- a/resolv/res_init.c
+++ b/resolv/res_init.c
@@ -3,7 +3,7 @@
  * -
  * Copyright (c) 1985, 1989, 1993
  *    The Regents of the University of California.  All rights reserved.
- * 
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ -19,7 +19,7 @@
  * 4. Neither the name of the University nor the names of its contributors
  *    may be used to endorse or promote products derived from this software
  *    without specific prior written permission.
- * 
+ *
  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
@@ -33,14 +33,14 @@
  * SUCH DAMAGE.
  * -
  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
- * 
+ *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
  * copyright notice and this permission notice appear in all copies, and that
  * the name of Digital Equipment Corporation not be used in advertising or
  * publicity pertaining to distribution of the document or software without
  * specific, written prior permission.
- * 
+ *
  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
@@ -76,6 +76,8 @@ static char rcsid[] = "$Id$";
 # include "../conf/portability.h"
 #endif
 
+#include "res_hconf.h"
+
 /*-------------------------------------- info about "sortlist" --------------
  * Marc Majka		1994/04/16
  * Allan Nathanson	1994/10/29 (BIND 4.9.3.x)
@@ -137,7 +139,7 @@ struct __res_state _res;
  * since it was noted that INADDR_ANY actually meant ``the first interface
  * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
  * it had to be "up" in order for you to reach your own name server.  It
- * was later decided that since the recommended practice is to always 
+ * was later decided that since the recommended practice is to always
  * install local static routes through 127.0.0.1 for all your network
  * interfaces, that we could solve this problem without a code change.
  *
@@ -354,11 +356,11 @@ res_init()
 				if (inet_aton(net, &a)) {
 				    _res.sort_list[nsort].mask = a.s_addr;
 				} else {
-				    _res.sort_list[nsort].mask = 
+				    _res.sort_list[nsort].mask =
 					net_mask(_res.sort_list[nsort].addr);
 				}
 			    } else {
-				_res.sort_list[nsort].mask = 
+				_res.sort_list[nsort].mask =
 				    net_mask(_res.sort_list[nsort].addr);
 			    }
 			    nsort++;
@@ -373,7 +375,7 @@ res_init()
 		    continue;
 		}
 	    }
-	    if (nserv > 1) 
+	    if (nserv > 1)
 		_res.nscount = nserv;
 #ifdef RESOLVSORT
 	    _res.nsort = nsort;
@@ -419,6 +421,8 @@ res_init()
 	if ((cp = getenv("RES_OPTIONS")) != NULL)
 		res_setoptions(cp, "env");
 	_res.options |= RES_INIT;
+
+	_res_hconf_init ();
 	return (0);
 }
 
@@ -458,6 +462,8 @@ res_setoptions(options, source)
 			}
 			printf(";;\tdebug\n");
 #endif
+		} else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
+			_res.options |= RES_USE_INET6;
 		} else {
 			/* XXX - print a warning here? */
 		}
@@ -562,7 +568,7 @@ netinfo_res_init(haveenv, havesearch)
 		    }
 		    ni_namelist_free(&nl);
 		}
-		
+
 		if (nserv > 1)
 		    _res.nscount = nserv;
 
diff --git a/resolv/resolv.h b/resolv/resolv.h
index 1a4a0dec89..0f5d5b855b 100644
--- a/resolv/resolv.h
+++ b/resolv/resolv.h
@@ -3,7 +3,7 @@
  * -
  * Copyright (c) 1983, 1987, 1989, 1993
  *    The Regents of the University of California.  All rights reserved.
- * 
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ -19,7 +19,7 @@
  * 4. Neither the name of the University nor the names of its contributors
  *    may be used to endorse or promote products derived from this software
  *    without specific prior written permission.
- * 
+ *
  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
@@ -33,14 +33,14 @@
  * SUCH DAMAGE.
  * -
  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
- * 
+ *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
  * copyright notice and this permission notice appear in all copies, and that
  * the name of Digital Equipment Corporation not be used in advertising or
  * publicity pertaining to distribution of the document or software without
  * specific, written prior permission.
- * 
+ *
  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
@@ -140,6 +140,7 @@ struct __res_state {
 #define	RES_INSECURE1	0x00000400	/* type 1 security disabled */
 #define	RES_INSECURE2	0x00000800	/* type 2 security disabled */
 #define	RES_NOALIASES	0x00001000	/* shuts off HOSTALIASES feature */
+#define	RES_USE_INET6	0x00002000	/* use/map IPv6 in gethostbyname() */
 
 #define RES_DEFAULT	(RES_RECURSE | RES_DEFNAMES | RES_DNSRCH)
 
@@ -185,7 +186,9 @@ extern struct __res_state _res;
 
 /* Private routines shared between libc/net, named, nslookup and others. */
 #define	res_hnok	__res_hnok
-#define	dn_isvalid	__dn_isvalid
+#define	res_ownok	__res_ownok
+#define	res_mailok	__res_mailok
+#define	res_dnok	__res_dnok
 #define	dn_skipname	__dn_skipname
 #define	fp_query	__fp_query
 #define	fp_nquery	__fp_nquery
@@ -206,7 +209,9 @@ extern struct __res_state _res;
 #define	res_queriesmatch __res_queriesmatch
 __BEGIN_DECLS
 int	 __res_hnok __P((const char *));
-int	 __dn_isvalid __P((const char *));
+int	 __res_ownok __P((const char *));
+int	 __res_mailok __P((const char *));
+int	 __res_dnok __P((const char *));
 int	 __dn_skipname __P((const u_char *, const u_char *));
 void	 __fp_resstat __P((struct __res_state *, FILE *));
 void	 __fp_query __P((const u_char *, FILE *));