Flatten bind9 vendor work area

1 files changed, 0 insertions, 1142 deletions

diff --git a/contrib/bind9/lib/bind/irs/dns_ho.c b/contrib/bind9/lib/bind/irs/dns_ho.c
deleted file mode 100644
index d1d6f5a..0000000
--- a/contrib/bind9/lib/bind/irs/dns_ho.c
+++ /dev/null
@@ -1,1142 +0,0 @@
-/*
- * 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:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- *    must display the following acknowledgement:
- * 	This product includes software developed by the University of
- * 	California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- * 
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-/*
- * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
- * Portions Copyright (c) 1996-1999 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 ISC DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC 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.
- */
-
-/* from gethostnamadr.c	8.1 (Berkeley) 6/4/93 */
-/* BIND Id: gethnamaddr.c,v 8.15 1996/05/22 04:56:30 vixie Exp $ */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static const char rcsid[] = "$Id: dns_ho.c,v 1.14.18.7 2006/12/07 03:54:24 marka Exp $";
-#endif /* LIBC_SCCS and not lint */
-
-/* Imports. */
-
-#include "port_before.h"
-
-#include <sys/types.h>
-#include <sys/param.h>
-#include <sys/socket.h>
-
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#include <arpa/nameser.h>
-
-#include <ctype.h>
-#include <errno.h>
-#include <stdlib.h>
-#include <netdb.h>
-#include <resolv.h>
-#include <stdio.h>
-#include <string.h>
-#include <syslog.h>
-
-#include <isc/memcluster.h>
-#include <irs.h>
-
-#include "port_after.h"
-
-#include "irs_p.h"
-#include "dns_p.h"
-
-#ifdef SPRINTF_CHAR
-# define SPRINTF(x) strlen(sprintf/**/x)
-#else
-# define SPRINTF(x) sprintf x
-#endif
-
-/* Definitions. */
-
-#define	MAXALIASES	35
-#define	MAXADDRS	35
-
-#define MAXPACKET (65535)	/*%< Maximum TCP message size */
-#define BOUNDS_CHECK(ptr, count) \
-	if ((ptr) + (count) > eom) { \
-		had_error++; \
-		continue; \
-	} else (void)0
-
-typedef union {
-	HEADER hdr;
-	u_char buf[MAXPACKET];
-} querybuf;
-
-struct dns_res_target {
-	struct dns_res_target *next;
-	querybuf qbuf;		/*%< query buffer */
-	u_char *answer;		/*%< buffer to put answer */
-	int anslen;		/*%< size of answer buffer */
-	int qclass, qtype;	/*%< class and type of query */
-	int action;		/*%< condition whether query is really issued */
-	char qname[MAXDNAME +1]; /*%< domain name */
-#if 0
-	int n;			/*%< result length */
-#endif
-};
-enum {RESTGT_DOALWAYS, RESTGT_AFTERFAILURE, RESTGT_IGNORE};
-enum {RESQRY_SUCCESS, RESQRY_FAIL};
-
-struct pvt {
-	struct hostent	host;
-	char *		h_addr_ptrs[MAXADDRS + 1];
-	char *		host_aliases[MAXALIASES];
-	char		hostbuf[8*1024];
-	u_char		host_addr[16];	/*%< IPv4 or IPv6 */
-	struct __res_state  *res;
-	void		(*free_res)(void *);
-};
-
-typedef union {
-	int32_t al;
-	char ac;
-} align;
-
-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 };
-/* Note: the IPv6 loopback address is in the "tunnel" space */
-static const u_char v6local[] = { 0,0, 0,1 }; /*%< last 4 bytes of IPv6 addr */
-/* Forwards. */
-
-static void		ho_close(struct irs_ho *this);
-static struct hostent *	ho_byname(struct irs_ho *this, const char *name);
-static struct hostent *	ho_byname2(struct irs_ho *this, const char *name,
-				   int af);
-static struct hostent *	ho_byaddr(struct irs_ho *this, const void *addr,
-				  int len, int af);
-static struct hostent *	ho_next(struct irs_ho *this);
-static void		ho_rewind(struct irs_ho *this);
-static void		ho_minimize(struct irs_ho *this);
-static struct __res_state * ho_res_get(struct irs_ho *this);
-static void		ho_res_set(struct irs_ho *this,
-				   struct __res_state *res,
-				   void (*free_res)(void *));
-static struct addrinfo * ho_addrinfo(struct irs_ho *this, const char *name,
-				     const struct addrinfo *pai);
-
-static void		map_v4v6_hostent(struct hostent *hp, char **bp,
-					 char *ep);
-static void		addrsort(res_state, char **, int);
-static struct hostent *	gethostans(struct irs_ho *this,
-				   const u_char *ansbuf, int anslen,
-				   const char *qname, int qtype,
-				   int af, int size,
-				   struct addrinfo **ret_aip,
-				   const struct addrinfo *pai);
-static int add_hostent(struct pvt *pvt, char *bp, char **hap,
-		       struct addrinfo *ai);
-static int		init(struct irs_ho *this);
-
-/* Exports. */
-
-struct irs_ho *
-irs_dns_ho(struct irs_acc *this) {
-	struct irs_ho *ho;
-	struct pvt *pvt;
-
-	UNUSED(this);
-
-	if (!(pvt = memget(sizeof *pvt))) {
-		errno = ENOMEM;
-		return (NULL);
-	}
-	memset(pvt, 0, sizeof *pvt);
-
-	if (!(ho = memget(sizeof *ho))) {
-		memput(pvt, sizeof *pvt);
-		errno = ENOMEM;
-		return (NULL);
-	}
-	memset(ho, 0x5e, sizeof *ho);
-	ho->private = pvt;
-	ho->close = ho_close;
-	ho->byname = ho_byname;
-	ho->byname2 = ho_byname2;
-	ho->byaddr = ho_byaddr;
-	ho->next = ho_next;
-	ho->rewind = ho_rewind;
-	ho->minimize = ho_minimize;
-	ho->res_get = ho_res_get;
-	ho->res_set = ho_res_set;
-	ho->addrinfo = ho_addrinfo;
-	return (ho);
-}
-
-/* Methods. */
-
-static void
-ho_close(struct irs_ho *this) {
-	struct pvt *pvt = (struct pvt *)this->private;
-
-	ho_minimize(this);
-	if (pvt->res && pvt->free_res)
-		(*pvt->free_res)(pvt->res);
-	memput(pvt, sizeof *pvt);
-	memput(this, sizeof *this);
-}
-
-static struct hostent *
-ho_byname(struct irs_ho *this, const char *name) {
-	struct pvt *pvt = (struct pvt *)this->private;
-	struct hostent *hp;
-
-	if (init(this) == -1)
-		return (NULL);
-
-	if (pvt->res->options & RES_USE_INET6) {
-		hp = ho_byname2(this, name, AF_INET6);
-		if (hp)
-			return (hp);
-	}
-	return (ho_byname2(this, name, AF_INET));
-}
-
-static struct hostent *
-ho_byname2(struct irs_ho *this, const char *name, int af)
-{
-	struct pvt *pvt = (struct pvt *)this->private;
-	struct hostent *hp = NULL;
-	int n, size;
-	char tmp[NS_MAXDNAME];
-	const char *cp;
-	struct addrinfo ai;
-	struct dns_res_target *q, *p;
-	int querystate = RESQRY_FAIL;
-
-	if (init(this) == -1)
-		return (NULL);
-
-	q = memget(sizeof(*q));
-	if (q == NULL) {
-		RES_SET_H_ERRNO(pvt->res, NETDB_INTERNAL);
-		errno = ENOMEM;
-		goto cleanup;
-	}
-	memset(q, 0, sizeof(*q));
-
-	switch (af) {
-	case AF_INET:
-		size = INADDRSZ;
-		q->qclass = C_IN;
-		q->qtype = T_A;
-		q->answer = q->qbuf.buf;
-		q->anslen = sizeof(q->qbuf);
-		q->action = RESTGT_DOALWAYS;
-		break;
-	case AF_INET6:
-		size = IN6ADDRSZ;
-		q->qclass = C_IN;
-		q->qtype = T_AAAA;
-		q->answer = q->qbuf.buf;
-		q->anslen = sizeof(q->qbuf);
-		q->action = RESTGT_DOALWAYS;
-		break;
-	default:
-		RES_SET_H_ERRNO(pvt->res, NETDB_INTERNAL);
-		errno = EAFNOSUPPORT;
-		hp = NULL;
-		goto cleanup;
-	}
-
-	/*
-	 * if there aren't any dots, it could be a user-level alias.
-	 * this is also done in res_nquery() since we are not the only
-	 * function that looks up host names.
-	 */
-	if (!strchr(name, '.') && (cp = res_hostalias(pvt->res, name,
-						      tmp, sizeof tmp)))
-		name = cp;
-
-	for (p = q; p; p = p->next) {
-		switch(p->action) {
-		case RESTGT_DOALWAYS:
-			break;
-		case RESTGT_AFTERFAILURE:
-			if (querystate == RESQRY_SUCCESS)
-				continue;
-			break;
-		case RESTGT_IGNORE:
-			continue;
-		}
-
-		if ((n = res_nsearch(pvt->res, name, p->qclass, p->qtype,
-				     p->answer, p->anslen)) < 0) {
-			querystate = RESQRY_FAIL;
-			continue;
-		}
-
-		memset(&ai, 0, sizeof(ai));
-		ai.ai_family = af;
-		if ((hp = gethostans(this, p->answer, n, name, p->qtype,
-				     af, size, NULL,
-				     (const struct addrinfo *)&ai)) != NULL)
-			goto cleanup;	/*%< no more loop is necessary */
-		querystate = RESQRY_FAIL;
-		continue;
-	}
-
- cleanup:
-	if (q != NULL)
-		memput(q, sizeof(*q));
-	return(hp);
-}
-
-static struct hostent *
-ho_byaddr(struct irs_ho *this, const void *addr, int len, int af)
-{
-	struct pvt *pvt = (struct pvt *)this->private;
-	const u_char *uaddr = addr;
-	char *qp;
-	struct hostent *hp = NULL;
-	struct addrinfo ai;
-	struct dns_res_target *q, *q2, *p;
-	int n, size, i;
-	int querystate = RESQRY_FAIL;
-	
-	if (init(this) == -1)
-		return (NULL);
-
-	q = memget(sizeof(*q));
-	q2 = memget(sizeof(*q2));
-	if (q == NULL || q2 == NULL) {
-		RES_SET_H_ERRNO(pvt->res, NETDB_INTERNAL);
-		errno = ENOMEM;
-		goto cleanup;
-	}
-	memset(q, 0, sizeof(*q));
-	memset(q2, 0, sizeof(*q2));
-
-	if (af == AF_INET6 && len == IN6ADDRSZ &&
-	    (!memcmp(uaddr, mapped, sizeof mapped) ||
-           (!memcmp(uaddr, tunnelled, sizeof tunnelled) &&
-            memcmp(&uaddr[sizeof tunnelled], v6local, sizeof(v6local))))) {
-		/* Unmap. */
-		addr = (const char *)addr + sizeof mapped;
-		uaddr += sizeof mapped;
-		af = AF_INET;
-		len = INADDRSZ;
-	}
-	switch (af) {
-	case AF_INET:
-		size = INADDRSZ;
-		q->qclass = C_IN;
-		q->qtype = T_PTR;
-		q->answer = q->qbuf.buf;
-		q->anslen = sizeof(q->qbuf);
-		q->action = RESTGT_DOALWAYS;
-		break;
-	case AF_INET6:
-		size = IN6ADDRSZ;
-		q->qclass = C_IN;
-		q->qtype = T_PTR;
-		q->answer = q->qbuf.buf;
-		q->anslen = sizeof(q->qbuf);
-		q->next = q2;
-		q->action = RESTGT_DOALWAYS;
-		q2->qclass = C_IN;
-		q2->qtype = T_PTR;
-		q2->answer = q2->qbuf.buf;
-		q2->anslen = sizeof(q2->qbuf);
-		if ((pvt->res->options & RES_NO_NIBBLE2) != 0U)
-			q2->action = RESTGT_IGNORE;
-		else
-			q2->action = RESTGT_AFTERFAILURE;
-		break;
-	default:
-		errno = EAFNOSUPPORT;
-		RES_SET_H_ERRNO(pvt->res, NETDB_INTERNAL);
-		hp = NULL;
-		goto cleanup;
-	}
-	if (size > len) {
-		errno = EINVAL;
-		RES_SET_H_ERRNO(pvt->res, NETDB_INTERNAL);
-		hp = NULL;
-		goto cleanup;
-	}
-	switch (af) {
-	case AF_INET:
-		qp = q->qname;
-		(void) sprintf(qp, "%u.%u.%u.%u.in-addr.arpa",
-			       (uaddr[3] & 0xff),
-			       (uaddr[2] & 0xff),
-			       (uaddr[1] & 0xff),
-			       (uaddr[0] & 0xff));
-		break;
-	case AF_INET6:
-		if (q->action != RESTGT_IGNORE) {
-			const char *nibsuff = res_get_nibblesuffix(pvt->res);
-			qp = q->qname;
-			for (n = IN6ADDRSZ - 1; n >= 0; n--) {
-				i = SPRINTF((qp, "%x.%x.",
-					       uaddr[n] & 0xf,
-					       (uaddr[n] >> 4) & 0xf));
-				if (i != 4)
-					abort();
-				qp += i;
-			}
-			if (strlen(q->qname) + strlen(nibsuff) + 1 >
-			    sizeof q->qname) {
-				errno = ENAMETOOLONG;
-				RES_SET_H_ERRNO(pvt->res, NETDB_INTERNAL);
-				hp = NULL;
-				goto cleanup;
-			}
-			strcpy(qp, nibsuff);	/* (checked) */
-		}
-		if (q2->action != RESTGT_IGNORE) {
-			const char *nibsuff2 = res_get_nibblesuffix2(pvt->res);
-			qp = q2->qname;
-			for (n = IN6ADDRSZ - 1; n >= 0; n--) {
-				i = SPRINTF((qp, "%x.%x.",
-					       uaddr[n] & 0xf,
-					       (uaddr[n] >> 4) & 0xf));
-				if (i != 4)
-					abort();
-				qp += i;
-			}
-			if (strlen(q2->qname) + strlen(nibsuff2) + 1 >
-			    sizeof q2->qname) {
-				errno = ENAMETOOLONG;
-				RES_SET_H_ERRNO(pvt->res, NETDB_INTERNAL);
-				hp = NULL;
-				goto cleanup;
-			}
-			strcpy(qp, nibsuff2);	/* (checked) */
-		}
-		break;
-	default:
-		abort();
-	}
-
-	for (p = q; p; p = p->next) {
-		switch(p->action) {
-		case RESTGT_DOALWAYS:
-			break;
-		case RESTGT_AFTERFAILURE:
-			if (querystate == RESQRY_SUCCESS)
-				continue;
-			break;
-		case RESTGT_IGNORE:
-			continue;
-		}
-
-		if ((n = res_nquery(pvt->res, p->qname, p->qclass, p->qtype,
-				    p->answer, p->anslen)) < 0) {
-			querystate = RESQRY_FAIL;
-			continue;
-		}
-
-		memset(&ai, 0, sizeof(ai));
-		ai.ai_family = af;
-		hp = gethostans(this, p->answer, n, p->qname, T_PTR, af, size,
-				NULL, (const struct addrinfo *)&ai);
-		if (!hp) {
-			querystate = RESQRY_FAIL;
-			continue;
-		}
-			
-		memcpy(pvt->host_addr, addr, len);
-		pvt->h_addr_ptrs[0] = (char *)pvt->host_addr;
-		pvt->h_addr_ptrs[1] = NULL;
-		if (af == AF_INET && (pvt->res->options & RES_USE_INET6)) {
-			map_v4v6_address((char*)pvt->host_addr,
-					 (char*)pvt->host_addr);
-			pvt->host.h_addrtype = AF_INET6;
-			pvt->host.h_length = IN6ADDRSZ;
-		}
-
-		RES_SET_H_ERRNO(pvt->res, NETDB_SUCCESS);
-		goto cleanup;	/*%< no more loop is necessary. */
-	}
-	hp = NULL; /*%< H_ERRNO was set by subroutines */
- cleanup:
-	if (q != NULL)
-		memput(q, sizeof(*q));
-	if (q2 != NULL)
-		memput(q2, sizeof(*q2));
-	return(hp);
-}
-
-static struct hostent *
-ho_next(struct irs_ho *this) {
-
-	UNUSED(this);
-
-	return (NULL);
-}
-
-static void
-ho_rewind(struct irs_ho *this) {
-
-	UNUSED(this);
-
-	/* NOOP */
-}
-
-static void
-ho_minimize(struct irs_ho *this) {
-	struct pvt *pvt = (struct pvt *)this->private;
-
-	if (pvt->res)
-		res_nclose(pvt->res);
-}
-
-static struct __res_state *
-ho_res_get(struct irs_ho *this) {
-	struct pvt *pvt = (struct pvt *)this->private;
-
-	if (!pvt->res) {
-		struct __res_state *res;
-		res = (struct __res_state *)malloc(sizeof *res);
-		if (!res) {
-			errno = ENOMEM;
-			return (NULL);
-		}
-		memset(res, 0, sizeof *res);
-		ho_res_set(this, res, free);
-	}
-
-	return (pvt->res);
-}
-
-/* XXX */
-extern struct addrinfo *addr2addrinfo __P((const struct addrinfo *,
-					   const char *));
-
-static struct addrinfo *
-ho_addrinfo(struct irs_ho *this, const char *name, const struct addrinfo *pai)
-{
-	struct pvt *pvt = (struct pvt *)this->private;
-	int n;
-	char tmp[NS_MAXDNAME];
-	const char *cp;
-	struct dns_res_target *q, *q2, *p;
-	struct addrinfo sentinel, *cur;
-	int querystate = RESQRY_FAIL;
-
-	if (init(this) == -1)
-		return (NULL);
-
-	memset(&sentinel, 0, sizeof(sentinel));
-	cur = &sentinel;
-
-	q = memget(sizeof(*q));
-	q2 = memget(sizeof(*q2));
-	if (q == NULL || q2 == NULL) {
-		RES_SET_H_ERRNO(pvt->res, NETDB_INTERNAL);
-		errno = ENOMEM;
-		goto cleanup;
-	}
-	memset(q, 0, sizeof(*q2));
-	memset(q2, 0, sizeof(*q2));
-
-	switch (pai->ai_family) {
-	case AF_UNSPEC:
-		/* prefer IPv6 */
-		q->qclass = C_IN;
-		q->qtype = T_AAAA;
-		q->answer = q->qbuf.buf;
-		q->anslen = sizeof(q->qbuf);
-		q->next = q2;
-		q->action = RESTGT_DOALWAYS;
-		q2->qclass = C_IN;
-		q2->qtype = T_A;
-		q2->answer = q2->qbuf.buf;
-		q2->anslen = sizeof(q2->qbuf);
-		q2->action = RESTGT_DOALWAYS;
-		break;
-	case AF_INET:
-		q->qclass = C_IN;
-		q->qtype = T_A;
-		q->answer = q->qbuf.buf;
-		q->anslen = sizeof(q->qbuf);
-		q->action = RESTGT_DOALWAYS;
-		break;
-	case AF_INET6:
-		q->qclass = C_IN;
-		q->qtype = T_AAAA;
-		q->answer = q->qbuf.buf;
-		q->anslen = sizeof(q->qbuf);
-		q->action = RESTGT_DOALWAYS;
-		break;
-	default:
-		RES_SET_H_ERRNO(pvt->res, NO_RECOVERY); /*%< better error? */
-		goto cleanup;
-	}
-
-	/*
-	 * if there aren't any dots, it could be a user-level alias.
-	 * this is also done in res_nquery() since we are not the only
-	 * function that looks up host names.
-	 */
-	if (!strchr(name, '.') && (cp = res_hostalias(pvt->res, name,
-						      tmp, sizeof tmp)))
-		name = cp;
-
-	for (p = q; p; p = p->next) {
-		struct addrinfo *ai;
-
-		switch(p->action) {
-		case RESTGT_DOALWAYS:
-			break;
-		case RESTGT_AFTERFAILURE:
-			if (querystate == RESQRY_SUCCESS)
-				continue;
-			break;
-		case RESTGT_IGNORE:
-			continue;
-		}
-
-		if ((n = res_nsearch(pvt->res, name, p->qclass, p->qtype,
-				     p->answer, p->anslen)) < 0) {
-			querystate = RESQRY_FAIL;
-			continue;
-		}
-		(void)gethostans(this, p->answer, n, name, p->qtype,
-				 pai->ai_family, /*%< XXX: meaningless */
-				 0, &ai, pai);
-		if (ai) {
-			querystate = RESQRY_SUCCESS;
-			cur->ai_next = ai;
-			while (cur->ai_next)
-				cur = cur->ai_next;
-		} else
-			querystate = RESQRY_FAIL;
-	}
-
- cleanup:
-	if (q != NULL)
-		memput(q, sizeof(*q));
-	if (q2 != NULL)
-		memput(q2, sizeof(*q2));
-	return(sentinel.ai_next);
-}
-
-static void
-ho_res_set(struct irs_ho *this, struct __res_state *res,
-		void (*free_res)(void *)) {
-	struct pvt *pvt = (struct pvt *)this->private;
-
-	if (pvt->res && pvt->free_res) {
-		res_nclose(pvt->res);
-		(*pvt->free_res)(pvt->res);
-	}
-
-	pvt->res = res;
-	pvt->free_res = free_res;
-}
-
-/* Private. */
-
-static struct hostent *
-gethostans(struct irs_ho *this,
-	   const u_char *ansbuf, int anslen, const char *qname, int qtype,
-	   int af, int size,	/*!< meaningless for addrinfo cases  */
-	   struct addrinfo **ret_aip, const struct addrinfo *pai)
-{
-	struct pvt *pvt = (struct pvt *)this->private;
-	int type, class, ancount, qdcount, n, haveanswer, had_error;
-	int error = NETDB_SUCCESS;
-	int (*name_ok)(const char *);
-	const HEADER *hp;
-	const u_char *eom;
-	const u_char *eor;
-	const u_char *cp;
-	const char *tname;
-	const char *hname;
-	char *bp, *ep, **ap, **hap;
-	char tbuf[MAXDNAME+1];
-	struct addrinfo sentinel, *cur, ai;
-
-	if (pai == NULL) abort();
-	if (ret_aip != NULL)
-		*ret_aip = NULL;
-	memset(&sentinel, 0, sizeof(sentinel));
-	cur = &sentinel;
-
-	tname = qname;
-	eom = ansbuf + anslen;
-	switch (qtype) {
-	case T_A:
-	case T_AAAA:
-	case T_ANY:	/*%< use T_ANY only for T_A/T_AAAA lookup */
-		name_ok = res_hnok;
-		break;
-	case T_PTR:
-		name_ok = res_dnok;
-		break;
-	default:
-		abort();
-	}
-
-	pvt->host.h_addrtype = af;
-	pvt->host.h_length = size;
-	hname = pvt->host.h_name = NULL;
-
-	/*
-	 * Find first satisfactory answer.
-	 */
-	if (ansbuf + HFIXEDSZ > eom) {
-		RES_SET_H_ERRNO(pvt->res, NO_RECOVERY);
-		return (NULL);
-	}
-	hp = (const HEADER *)ansbuf;
-	ancount = ntohs(hp->ancount);
-	qdcount = ntohs(hp->qdcount);
-	bp = pvt->hostbuf;
-	ep = pvt->hostbuf + sizeof(pvt->hostbuf);
-	cp = ansbuf + HFIXEDSZ;
-	if (qdcount != 1) {
-		RES_SET_H_ERRNO(pvt->res, NO_RECOVERY);
-		return (NULL);
-	}
-	n = dn_expand(ansbuf, eom, cp, bp, ep - bp);
-	if (n < 0 || !maybe_ok(pvt->res, bp, name_ok)) {
-		RES_SET_H_ERRNO(pvt->res, NO_RECOVERY);
-		return (NULL);
-	}
-	cp += n + QFIXEDSZ;
-	if (cp > eom) {
-		RES_SET_H_ERRNO(pvt->res, NO_RECOVERY);
-		return (NULL);
-	}
-	if (qtype == T_A || qtype == T_AAAA || qtype == T_ANY) {
-		/* res_nsend() 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).
-		 */
-		n = strlen(bp) + 1;		/*%< for the \\0 */
-		if (n > MAXHOSTNAMELEN) {
-			RES_SET_H_ERRNO(pvt->res, NO_RECOVERY);
-			return (NULL);
-		}
-		pvt->host.h_name = bp;
-		hname = bp;
-		bp += n;
-		/* The qname can be abbreviated, but hname is now absolute. */
-		qname = pvt->host.h_name;
-	}
-	ap = pvt->host_aliases;
-	*ap = NULL;
-	pvt->host.h_aliases = pvt->host_aliases;
-	hap = pvt->h_addr_ptrs;
-	*hap = NULL;
-	pvt->host.h_addr_list = pvt->h_addr_ptrs;
-	haveanswer = 0;
-	had_error = 0;
-	while (ancount-- > 0 && cp < eom && !had_error) {
-		n = dn_expand(ansbuf, eom, cp, bp, ep - bp);
-		if (n < 0 || !maybe_ok(pvt->res, bp, name_ok)) {
-			had_error++;
-			continue;
-		}
-		cp += n;			/*%< name */
-		BOUNDS_CHECK(cp, 3 * INT16SZ + INT32SZ);
-		type = ns_get16(cp);
- 		cp += INT16SZ;			/*%< type */
-		class = ns_get16(cp);
- 		cp += INT16SZ + INT32SZ;	/*%< class, TTL */
-		n = ns_get16(cp);
-		cp += INT16SZ;			/*%< len */
-		BOUNDS_CHECK(cp, n);
-		if (class != C_IN) {
-			cp += n;
-			continue;
-		}
-		eor = cp + n;
-		if ((qtype == T_A || qtype == T_AAAA || qtype == T_ANY) &&
-		    type == T_CNAME) {
-			if (haveanswer) {
-				int level = LOG_CRIT;
-#ifdef LOG_SECURITY
-				level |= LOG_SECURITY;
-#endif
-				syslog(level,
- "gethostans: possible attempt to exploit buffer overflow while looking up %s",
-					*qname ? qname : ".");
-			}
-			n = dn_expand(ansbuf, eor, cp, tbuf, sizeof tbuf);
-			if (n < 0 || !maybe_ok(pvt->res, tbuf, name_ok)) {
-				had_error++;
-				continue;
-			}
-			cp += n;
-			/* Store alias. */
-			if (ap >= &pvt->host_aliases[MAXALIASES-1])
-				continue;
-			*ap++ = bp;
-			n = strlen(bp) + 1;	/*%< for the \\0 */
-			bp += n;
-			/* Get canonical name. */
-			n = strlen(tbuf) + 1;	/*%< for the \\0 */
-			if (n > (ep - bp) || n > MAXHOSTNAMELEN) {
-				had_error++;
-				continue;
-			}
-			strcpy(bp, tbuf);	/* (checked) */
-			pvt->host.h_name = bp;
-			hname = bp;
-			bp += n;
-			continue;
-		}
-		if (qtype == T_PTR && type == T_CNAME) {
-			n = dn_expand(ansbuf, eor, cp, tbuf, sizeof tbuf);
-			if (n < 0 || !maybe_dnok(pvt->res, tbuf)) {
-				had_error++;
-				continue;
-			}
-			cp += n;
-#ifdef RES_USE_DNAME
-			if ((pvt->res->options & RES_USE_DNAME) != 0U)
-#endif
-			{
-				/*
-				 * We may be able to check this regardless
-				 * of the USE_DNAME bit, but we add the check
-				 * for now since the DNAME support is
-				 * experimental.
-				 */
-				if (ns_samename(tname, bp) != 1)
-					continue;
-			}
-			/* Get canonical name. */
-			n = strlen(tbuf) + 1;	/*%< for the \\0 */
-			if (n > (ep - bp)) {
-				had_error++;
-				continue;
-			}
-			strcpy(bp, tbuf);	/* (checked) */
-			tname = bp;
-			bp += n;
-			continue;
-		}
-		if (qtype == T_ANY) {
-			if (!(type == T_A || type == T_AAAA)) {
-				cp += n;
-				continue;
-			}
-		} else if (type != qtype) {
-			cp += n;
-			continue;
-		}
-		switch (type) {
-		case T_PTR:
-			if (ret_aip != NULL) {
-				/* addrinfo never needs T_PTR */
-				cp += n;
-				continue;
-			}
-			if (ns_samename(tname, bp) != 1) {
-				cp += n;
-				continue;
-			}
-			n = dn_expand(ansbuf, eor, cp, bp, ep - bp);
-			if (n < 0 || !maybe_hnok(pvt->res, bp) ||
-			    n >= MAXHOSTNAMELEN) {
-				had_error++;
-				break;
-			}
-			cp += n;
-			if (!haveanswer) {
-				pvt->host.h_name = bp;
-				hname = bp;
-			}
-			else if (ap < &pvt->host_aliases[MAXALIASES-1])
-				*ap++ = bp;
-			else
-				n = -1;
-			if (n != -1) {
-				n = strlen(bp) + 1;	/*%< for the \\0 */
-				bp += n;
-			}
-			break;
-		case T_A:
-		case T_AAAA:
-			if (ns_samename(hname, bp) != 1) {
-				cp += n;
-				continue;
-			}
-			if (type == T_A && n != INADDRSZ) {
-				cp += n;
-				continue;
-			}
-			if (type == T_AAAA && n != IN6ADDRSZ) {
-				cp += n;
-				continue;
-			}
-
-			/* make addrinfo. don't overwrite constant PAI */
-			ai = *pai;
-			ai.ai_family = (type == T_AAAA) ? AF_INET6 : AF_INET;
-			cur->ai_next = addr2addrinfo(
-					(const struct addrinfo *)&ai,
-					(const char *)cp);
-			if (cur->ai_next == NULL)
-				had_error++;
-
-			if (!haveanswer) {
-				int nn;
-
-				nn = strlen(bp) + 1;	/*%< for the \\0 */
-				if (nn >= MAXHOSTNAMELEN) {
-					cp += n;
-					had_error++;
-					continue;
-				}
-				pvt->host.h_name = bp;
-				hname = bp;
-				bp += nn;
-			}
-			/* Ensure alignment. */
-			bp = (char *)(((u_long)bp + (sizeof(align) - 1)) &
-				      ~(sizeof(align) - 1));
-			/* Avoid overflows. */
-			if (bp + n > &pvt->hostbuf[sizeof(pvt->hostbuf) - 1]) {
-				had_error++;
-				continue;
-			}
-			if (ret_aip) { /*%< need addrinfo. keep it. */
-				while (cur->ai_next)
-					cur = cur->ai_next;
-			} else if (cur->ai_next) { /*%< need hostent */
-				struct addrinfo *aip = cur->ai_next;
-
-				for (aip = cur->ai_next; aip;
-				     aip = aip->ai_next) {
-					int m;
-
-					m = add_hostent(pvt, bp, hap, aip);
-					if (m < 0) {
-						had_error++;
-						break;
-					}
-					if (m == 0)
-						continue;
-					if (hap < &pvt->h_addr_ptrs[MAXADDRS-1])
-						hap++;
-					*hap = NULL;
-					bp += m;
-				}
-
-				freeaddrinfo(cur->ai_next);
-				cur->ai_next = NULL;
-			}
-			cp += n;
-			break;
-		default:
-			abort();
-		}
-		if (!had_error)
-			haveanswer++;
-	}
-	if (haveanswer) {
-		if (ret_aip == NULL) {
-			*ap = NULL;
-			*hap = NULL;
-
-			if (pvt->res->nsort && haveanswer > 1 && qtype == T_A)
-				addrsort(pvt->res, pvt->h_addr_ptrs,
-					 haveanswer);
-			if (pvt->host.h_name == NULL) {
-				n = strlen(qname) + 1;	/*%< for the \\0 */
-				if (n > (ep - bp) || n >= MAXHOSTNAMELEN)
-					goto no_recovery;
-				strcpy(bp, qname);	/* (checked) */
-				pvt->host.h_name = bp;
-				bp += n;
-			}
-			if (pvt->res->options & RES_USE_INET6)
-				map_v4v6_hostent(&pvt->host, &bp, ep);
-			RES_SET_H_ERRNO(pvt->res, NETDB_SUCCESS);
-			return (&pvt->host);
-		} else {
-			if ((pai->ai_flags & AI_CANONNAME) != 0) {
-				if (pvt->host.h_name == NULL) {
-					sentinel.ai_next->ai_canonname =
-						strdup(qname);
-				}
-				else {
-					sentinel.ai_next->ai_canonname =
-						strdup(pvt->host.h_name);
-				}
-			}
-			*ret_aip = sentinel.ai_next;
-			return(NULL);
-		}
-	}
- no_recovery:
-	if (sentinel.ai_next) {
-		/* this should be impossible, but check it for safety */
-		freeaddrinfo(sentinel.ai_next);
-	}
-	if (error == NETDB_SUCCESS)
-		RES_SET_H_ERRNO(pvt->res, NO_RECOVERY);
-	else
-		RES_SET_H_ERRNO(pvt->res, error);
-	return(NULL);
-}
-
-static int
-add_hostent(struct pvt *pvt, char *bp, char **hap, struct addrinfo *ai)
-{
-	int addrlen;
-	char *addrp;
-	const char **tap;
-	char *obp = bp;
-
-	switch(ai->ai_addr->sa_family) {
-	case AF_INET6:
-		addrlen = IN6ADDRSZ;
-		addrp = (char *)&((struct sockaddr_in6 *)ai->ai_addr)->sin6_addr;
-		break;
-	case AF_INET:
-		addrlen = INADDRSZ;
-		addrp = (char *)&((struct sockaddr_in *)ai->ai_addr)->sin_addr;
-		break;
-	default:
-		return(-1);	/*%< abort? */
-	}
-
-	/* Ensure alignment. */
-	bp = (char *)(((u_long)bp + (sizeof(align) - 1)) &
-		      ~(sizeof(align) - 1));
-	/* Avoid overflows. */
-	if (bp + addrlen > &pvt->hostbuf[sizeof(pvt->hostbuf) - 1])
-		return(-1);
-	if (hap >= &pvt->h_addr_ptrs[MAXADDRS-1])
-		return(0); /*%< fail, but not treat it as an error. */
-	/* Suppress duplicates. */
-	for (tap = (const char **)pvt->h_addr_ptrs;
-	     *tap != NULL;
-	     tap++)
-		if (memcmp(*tap, addrp, addrlen) == 0)
-			break;
-	if (*tap != NULL)
-		return (0);
-
-	memcpy(*hap = bp, addrp, addrlen);
-	return((bp + addrlen) - obp);
-}
-
-static void
-map_v4v6_hostent(struct hostent *hp, char **bpp, char *ep) {
-	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 = (u_long)*bpp % sizeof(align);
-
-		if (i != 0)
-			i = sizeof(align) - i;
-
-		if ((ep - *bpp) < (i + IN6ADDRSZ)) {
-			/* Out of memory.  Truncate address list here. */
-			*ap = NULL;
-			return;
-		}
-		*bpp += i;
-		map_v4v6_address(*ap, *bpp);
-		*ap = *bpp;
-		*bpp += IN6ADDRSZ;
-	}
-}
-
-static void
-addrsort(res_state statp, char **ap, int num) {
-	int i, j, needsort = 0, aval[MAXADDRS];
-	char **p;
-
-	p = ap;
-	for (i = 0; i < num; i++, p++) {
-		for (j = 0 ; (unsigned)j < statp->nsort; j++)
-			if (statp->sort_list[j].addr.s_addr == 
-			    (((struct in_addr *)(*p))->s_addr &
-			     statp->sort_list[j].mask))
-				break;
-		aval[i] = j;
-		if (needsort == 0 && i > 0 && j < aval[i-1])
-			needsort = i;
-	}
-	if (!needsort)
-		return;
-
-	while (needsort < num) {
-		for (j = needsort - 1; j >= 0; j--) {
-			if (aval[j] > aval[j+1]) {
-				char *hp;
-
-				i = aval[j];
-				aval[j] = aval[j+1];
-				aval[j+1] = i;
-
-				hp = ap[j];
-				ap[j] = ap[j+1];
-				ap[j+1] = hp;
-
-			} else
-				break;
-		}
-		needsort++;
-	}
-}
-
-static int
-init(struct irs_ho *this) {
-	struct pvt *pvt = (struct pvt *)this->private;
-	
-	if (!pvt->res && !ho_res_get(this))
-		return (-1);
-	if (((pvt->res->options & RES_INIT) == 0U) &&
-	    res_ninit(pvt->res) == -1)
-		return (-1);
-	return (0);
-}