usr/src/cmd/cmd-inet/usr.sbin/snoop/snoop_ipaddr.c - illumos-gate - Gitiles

 /*
  * CDDL HEADER START
  *
  * The contents of this file are subject to the terms of the
  * Common Development and Distribution License (the "License").
  * You may not use this file except in compliance with the License.
  *
  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  * or http://www.opensolaris.org/os/licensing.
  * See the License for the specific language governing permissions
  * and limitations under the License.
  *
  * When distributing Covered Code, include this CDDL HEADER in each
  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  * If applicable, add the following below this CDDL HEADER, with the
  * fields enclosed by brackets "[]" replaced with your own identifying
  * information: Portions Copyright [yyyy] [name of copyright owner]
  *
  * CDDL HEADER END
  */
 /*
  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */

 #pragma ident	"%Z%%M%	%I%	%E% SMI"	/* SunOS */

 #include <stdio.h>
 #include <stdlib.h>
 #include <ctype.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/sockio.h>
 #include <net/if.h>
 #include <netinet/in_systm.h>
 #include <netinet/in.h>
 #include <netinet/if_ether.h>
 #include <netinet/ip.h>
 #include <netdb.h>
 #include <string.h>
 #include <signal.h>
 #include <setjmp.h>
 #include <arpa/inet.h>
 #include "snoop.h"

 static sigjmp_buf nisjmp;

 #define	MAXHASH 1024  /* must be a power of 2 */

 #define	SEPARATORS " \t\n"

 struct hostdata {
 	struct hostdata	*h_next;
 	char		*h_hostname;
 	int		h_pktsout;
 	int		h_pktsin;
 };

 struct hostdata4 {
 	struct hostdata4	*h4_next;
 	char		*h4_hostname;
 	int		h4_pktsout;
 	int		h4_pktsin;
 	struct in_addr	h4_addr;
 };

 struct hostdata6 {
 	struct hostdata6	*h6_next;
 	char		*h6_hostname;
 	int		h6_pktsout;
 	int		h6_pktsin;
 	struct in6_addr	h6_addr;
 };

 static struct hostdata *addhost(int, const void *, const char *, char **);

 static struct hostdata4 *h_table4[MAXHASH];
 static struct hostdata6 *h_table6[MAXHASH];

 #define	iphash(e)  ((e) & (MAXHASH-1))

 /* ARGSUSED */
 static void
 wakeup(int n)
 {
 	siglongjmp(nisjmp, 1);
 }

 extern char *inet_ntoa();
 extern boolean_t rflg;

 static struct hostdata *
 iplookup(struct in_addr ipaddr)
 {
 	register struct hostdata4 *h;
 	struct hostent *hp = NULL;
 	struct netent *np;
 	int error_num;
 	struct hostdata *retval;

 	for (h = h_table4[iphash(ipaddr.s_addr)]; h; h = h->h4_next) {
 		if (h->h4_addr.s_addr == ipaddr.s_addr)
 			return ((struct hostdata *)h);
 	}

 	/* not found.  Put it in */

 	if (ipaddr.s_addr == htonl(INADDR_BROADCAST))
 		return (addhost(AF_INET, &ipaddr, "BROADCAST", NULL));
 	if (ipaddr.s_addr == htonl(INADDR_ANY))
 		return (addhost(AF_INET, &ipaddr, "OLD-BROADCAST", NULL));

 	/*
 	 * Set an alarm here so we don't get held up by
 	 * an unresponsive name server.
 	 * Give it 3 sec to do its work.
 	 */
 	if (! rflg && sigsetjmp(nisjmp, 1) == 0) {
 		(void) snoop_alarm(3, wakeup);
 		hp = getipnodebyaddr((char *)&ipaddr, sizeof (int),
 			AF_INET, &error_num);
 		if (hp == NULL && inet_lnaof(ipaddr) == 0) {
 			np = getnetbyaddr(inet_netof(ipaddr), AF_INET);
 			if (np)
 				return (addhost(AF_INET, &ipaddr, np->n_name,
 					np->n_aliases));
 		}
 		(void) snoop_alarm(0, wakeup);
 	}

 	retval = addhost(AF_INET, &ipaddr,
 	    hp ? hp->h_name : inet_ntoa(ipaddr),
 	    hp ? hp->h_aliases : NULL);
 	if (hp != NULL)
 		freehostent(hp);
 	return (retval);
 }

 static struct hostdata *
 ip6lookup(const struct in6_addr *ip6addr)
 {
 	struct hostdata6 *h;
 	struct hostent *hp = NULL;
 	int error_num;
 	char addrstr[INET6_ADDRSTRLEN];
 	char *addname;
 	struct hostdata *retval;

 	for (h = h_table6[iphash(((uint32_t *)ip6addr)[3])]; h;
 	    h = h->h6_next) {
 		if (IN6_ARE_ADDR_EQUAL(&h->h6_addr, ip6addr))
 			return ((struct hostdata *)h);
 	}

 	/* not in the hash table, put it in */
 	if (IN6_IS_ADDR_UNSPECIFIED(ip6addr))
 		return (addhost(AF_INET6, ip6addr, "UNSPECIFIED", NULL));

 	/*
 	 * Set an alarm here so we don't get held up by
 	 * an unresponsive name server.
 	 * Give it 3 sec to do its work.
 	 */
 	if (! rflg && sigsetjmp(nisjmp, 1) == 0) {
 		(void) snoop_alarm(3, wakeup);
 		hp = getipnodebyaddr(ip6addr, sizeof (struct in6_addr),
 		    AF_INET6, &error_num);
 		(void) snoop_alarm(0, wakeup);
 	} else {
 		hp = NULL;
 	}

 	if (hp != NULL)
 		addname = hp->h_name;
 	else {
 		(void) inet_ntop(AF_INET6, ip6addr, addrstr, INET6_ADDRSTRLEN);
 		addname = addrstr;
 	}

 	retval = addhost(AF_INET6, ip6addr, addname, hp ? hp->h_aliases : NULL);
 	if (hp != NULL)
 		freehostent(hp);
 	return (retval);
 }

 static struct hostdata *
 addhost(int family, const void *ipaddr, const char *name, char **aliases)
 {
 	struct hostdata **hp, *n = NULL;
 	extern FILE *namefile;
 	int hashval;
 	static char aname[128];
 	char *np;
 	static struct hostdata h;
 	int ind;

 	switch (family) {
 	case AF_INET:
 		n = (struct hostdata *)malloc(sizeof (struct hostdata4));
 		if (n == NULL)
 			goto alloc_failed;

 		memset(n, 0, sizeof (struct hostdata4));
 		n->h_hostname = strdup(name);
 		if (n->h_hostname == NULL)
 			goto alloc_failed;

 		((struct hostdata4 *)n)->h4_addr =
 		    *(const struct in_addr *)ipaddr;
 		hashval = ((struct in_addr *)ipaddr)->s_addr;
 		hp = (struct hostdata **)&h_table4[iphash(hashval)];
 		break;
 	case AF_INET6:
 		n = (struct hostdata *)malloc(sizeof (struct hostdata6));
 		if (n == NULL)
 			goto alloc_failed;

 		memset(n, 0, sizeof (struct hostdata6));
 		n->h_hostname = strdup(name);
 		if (n->h_hostname == NULL)
 			goto alloc_failed;

 		memcpy(&((struct hostdata6 *)n)->h6_addr, ipaddr,
 		    sizeof (struct in6_addr));
 		hashval = ((const int *)ipaddr)[3];
 		hp = (struct hostdata **)&h_table6[iphash(hashval)];
 		break;
 	default:
 		fprintf(stderr, "snoop: ERROR: Unknown address family: %d",
 		    family);
 		exit(1);
 	}

 	n->h_next = *hp;
 	*hp = n;

 	if (namefile != NULL) {
 		if (family == AF_INET) {
 			np = inet_ntoa(*(const struct in_addr *)ipaddr);
 			if (np) {
 				(void) fprintf(namefile, "%s\t%s", np, name);
 				if (aliases) {
 					for (ind = 0;
 					    aliases[ind] != NULL;
 					    ind++) {
 						(void) fprintf(namefile, " %s",
 								aliases[ind]);
 					}
 				}
 				(void) fprintf(namefile, "\n");
 			}
 		} else if (family == AF_INET6) {
 			np = (char *)inet_ntop(AF_INET6, (void *)ipaddr, aname,
 					sizeof (aname));
 			if (np) {
 				(void) fprintf(namefile, "%s\t%s", np, name);
 				if (aliases) {
 					for (ind = 0;
 					    aliases[ind] != NULL;
 					    ind++) {
 						(void) fprintf(namefile, " %s",
 								aliases[ind]);
 					}
 				}
 				(void) fprintf(namefile, "\n");
 			}
 		} else {
 			(void) fprintf(stderr, "addhost: unknown family %d\n",
 				family);
 		}
 	}
 	return (n);

 alloc_failed:
 	if (n)
 		free(n);
 	(void) fprintf(stderr, "addhost: no mem\n");

 	aname[0] = '\0';
 	memset(&h, 0, sizeof (struct hostdata));
 	h.h_hostname = aname;
 	return (&h);
 }

 char *
 addrtoname(int family, const void *ipaddr)
 {
 	switch (family) {
 	case AF_INET:
 		return (iplookup(*(const struct in_addr *)ipaddr)->h_hostname);
 	case AF_INET6:
 		return (ip6lookup((const struct in6_addr *)ipaddr)->h_hostname);
 	}
 	(void) fprintf(stderr, "snoop: ERROR: unknown address family: %d\n",
 	    family);
 	exit(1);
 	/* NOTREACHED */
 }

 void
 load_names(fname)
 	char *fname;
 {
 	char buf[1024];
 	char *addr, *name, *alias;
 	FILE *f;
 	unsigned int addrv4;
 	struct in6_addr addrv6;
 	int family;
 	void *naddr;

 	(void) fprintf(stderr, "Loading name file %s\n", fname);
 	f = fopen(fname, "r");
 	if (f == NULL) {
 		perror(fname);
 		return;
 	}

 	while (fgets(buf, 1024, f) != NULL) {
 		addr = strtok(buf, SEPARATORS);
 		if (addr == NULL || *addr == '#')
 			continue;
 		if (inet_pton(AF_INET6, addr, (void *)&addrv6) == 1) {
 			family = AF_INET6;
 			naddr = (void *)&addrv6;
 		} else if ((addrv4 = inet_addr(addr)) != (ulong_t)-1) {
 			family = AF_INET;
 			naddr = (void *)&addrv4;
 		}
 		name = strtok(NULL, SEPARATORS);
 		if (name == NULL)
 			continue;
 		while ((alias = strtok(NULL, SEPARATORS)) != NULL &&
 		    (*alias != '#')) {
 			(void) addhost(family, naddr, alias, NULL);
 		}
 		(void) addhost(family, naddr, name, NULL);
 		/* Note: certain addresses such as broadcast are skipped */
 	}

 	(void) fclose(f);
 }

 /*
  * lgetipnodebyname: looks up hostname in cached address data. This allows
  * filtering on hostnames from the .names file to work properly, and
  * avoids name clashes between domains. Note that only the first of the
  * ipv4, ipv6, or v4mapped address will be returned, because the
  * cache does not contain information on multi-homed hosts.
  */
 /*ARGSUSED*/
 struct hostent *
 lgetipnodebyname(const char *name, int af, int flags, int *error_num)
 {
 	int i;
 	struct hostdata4 *h;
 	struct hostdata6 *h6;
 	static struct hostent he;		/* host entry */
 	static struct in6_addr h46_addr[MAXADDRS];	/* v4mapped address */
 	static char h_name[MAXHOSTNAMELEN];	/* hostname */
 	static char *list[MAXADDRS];		/* addr_list array */
 	struct hostent *hp = &he;
 	int ind;

 	(void) memset((char *)hp, 0, sizeof (struct hostent));
 	hp->h_name = h_name;
 	h_name[0] = '\0';
 	strcpy(h_name, name);

 	hp->h_addrtype = AF_INET6;

 	hp->h_addr_list = list;
 	for (i = 0; i < MAXADDRS; i++)
 		hp->h_addr_list[i] = NULL;
 	ind = 0;

 	/* ipv6 lookup */
 	if (af == AF_INET6) {
 		hp->h_length = sizeof (struct in6_addr);
 		for (i = 0; i < MAXHASH; i++) {
 			for (h6 = h_table6[i]; h6; h6 = h6->h6_next) {
 				if (strcmp(name, h6->h6_hostname) == 0) {
 					if (ind >= MAXADDRS - 1) {
 						/* too many addresses */
 						return (hp);
 					}
 					/* found ipv6 addr */
 					hp->h_addr_list[ind] =
 						(char *)&h6->h6_addr;
 					ind++;
 				}
 			}
 		}
 	}
 	/* ipv4 or v4mapped lookup */
 	if (af == AF_INET || (flags & AI_ALL)) {
 		for (i = 0; i < MAXHASH; i++) {
 			for (h = h_table4[i]; h; h = h->h4_next) {
 				if (strcmp(name, h->h4_hostname) == 0) {
 					if (ind >= MAXADDRS - 1) {
 						/* too many addresses */
 						return (hp);
 					}
 					if (af == AF_INET) {
 						/* found ipv4 addr */
 						hp->h_addrtype = AF_INET;
 						hp->h_length =
 						    sizeof (struct in_addr);
 						hp->h_addr_list[ind] =
 						    (char *)&h->h4_addr;
 						ind++;
 					} else {
 						/* found v4mapped addr */
 						hp->h_length =
 						    sizeof (struct in6_addr);
 						hp->h_addr_list[ind] =
 						    (char *)&h46_addr[ind];
 						IN6_INADDR_TO_V4MAPPED(
 							&h->h4_addr,
 							&h46_addr[ind]);
 						ind++;
 					}
 				}
 			}
 		}
 	}
 	return (ind > 0 ? hp : NULL);
 }
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
	* Use is subject to license terms.
	*/

	#pragma ident "%Z%%M% %I% %E% SMI" /* SunOS */

	#include <stdio.h>
	#include <stdlib.h>
	#include <ctype.h>
	#include <sys/types.h>
	#include <sys/socket.h>
	#include <sys/sockio.h>
	#include <net/if.h>
	#include <netinet/in_systm.h>
	#include <netinet/in.h>
	#include <netinet/if_ether.h>
	#include <netinet/ip.h>
	#include <netdb.h>
	#include <string.h>
	#include <signal.h>
	#include <setjmp.h>
	#include <arpa/inet.h>
	#include "snoop.h"

	static sigjmp_buf nisjmp;

	#define MAXHASH 1024 /* must be a power of 2 */

	#define SEPARATORS " \t\n"

	struct hostdata {
	struct hostdata *h_next;
	char *h_hostname;
	int h_pktsout;
	int h_pktsin;
	};

	struct hostdata4 {
	struct hostdata4 *h4_next;
	char *h4_hostname;
	int h4_pktsout;
	int h4_pktsin;
	struct in_addr h4_addr;
	};

	struct hostdata6 {
	struct hostdata6 *h6_next;
	char *h6_hostname;
	int h6_pktsout;
	int h6_pktsin;
	struct in6_addr h6_addr;
	};

	static struct hostdata addhost(int, const void , const char , char *);

	static struct hostdata4 *h_table4[MAXHASH];
	static struct hostdata6 *h_table6[MAXHASH];

	#define iphash(e) ((e) & (MAXHASH-1))

	/* ARGSUSED */
	static void
	wakeup(int n)
	{
	siglongjmp(nisjmp, 1);
	}

	extern char *inet_ntoa();
	extern boolean_t rflg;

	static struct hostdata *
	iplookup(struct in_addr ipaddr)
	{
	register struct hostdata4 *h;
	struct hostent *hp = NULL;
	struct netent *np;
	int error_num;
	struct hostdata *retval;

	for (h = h_table4[iphash(ipaddr.s_addr)]; h; h = h->h4_next) {
	if (h->h4_addr.s_addr == ipaddr.s_addr)
	return ((struct hostdata *)h);
	}

	/* not found. Put it in */

	if (ipaddr.s_addr == htonl(INADDR_BROADCAST))
	return (addhost(AF_INET, &ipaddr, "BROADCAST", NULL));
	if (ipaddr.s_addr == htonl(INADDR_ANY))
	return (addhost(AF_INET, &ipaddr, "OLD-BROADCAST", NULL));

	/*
	* Set an alarm here so we don't get held up by
	* an unresponsive name server.
	* Give it 3 sec to do its work.
	*/
	if (! rflg && sigsetjmp(nisjmp, 1) == 0) {
	(void) snoop_alarm(3, wakeup);
	hp = getipnodebyaddr((char *)&ipaddr, sizeof (int),
	AF_INET, &error_num);
	if (hp == NULL && inet_lnaof(ipaddr) == 0) {
	np = getnetbyaddr(inet_netof(ipaddr), AF_INET);
	if (np)
	return (addhost(AF_INET, &ipaddr, np->n_name,
	np->n_aliases));
	}
	(void) snoop_alarm(0, wakeup);
	}

	retval = addhost(AF_INET, &ipaddr,
	hp ? hp->h_name : inet_ntoa(ipaddr),
	hp ? hp->h_aliases : NULL);
	if (hp != NULL)
	freehostent(hp);
	return (retval);
	}

	static struct hostdata *
	ip6lookup(const struct in6_addr *ip6addr)
	{
	struct hostdata6 *h;
	struct hostent *hp = NULL;
	int error_num;
	char addrstr[INET6_ADDRSTRLEN];
	char *addname;
	struct hostdata *retval;

	for (h = h_table6[iphash(((uint32_t *)ip6addr)[3])]; h;
	h = h->h6_next) {
	if (IN6_ARE_ADDR_EQUAL(&h->h6_addr, ip6addr))
	return ((struct hostdata *)h);
	}

	/* not in the hash table, put it in */
	if (IN6_IS_ADDR_UNSPECIFIED(ip6addr))
	return (addhost(AF_INET6, ip6addr, "UNSPECIFIED", NULL));

	/*
	* Set an alarm here so we don't get held up by
	* an unresponsive name server.
	* Give it 3 sec to do its work.
	*/
	if (! rflg && sigsetjmp(nisjmp, 1) == 0) {
	(void) snoop_alarm(3, wakeup);
	hp = getipnodebyaddr(ip6addr, sizeof (struct in6_addr),
	AF_INET6, &error_num);
	(void) snoop_alarm(0, wakeup);
	} else {
	hp = NULL;
	}

	if (hp != NULL)
	addname = hp->h_name;
	else {
	(void) inet_ntop(AF_INET6, ip6addr, addrstr, INET6_ADDRSTRLEN);
	addname = addrstr;
	}

	retval = addhost(AF_INET6, ip6addr, addname, hp ? hp->h_aliases : NULL);
	if (hp != NULL)
	freehostent(hp);
	return (retval);
	}

	static struct hostdata *
	addhost(int family, const void ipaddr, const char name, char **aliases)
	{
	struct hostdata *hp, n = NULL;
	extern FILE *namefile;
	int hashval;
	static char aname[128];
	char *np;
	static struct hostdata h;
	int ind;

	switch (family) {
	case AF_INET:
	n = (struct hostdata *)malloc(sizeof (struct hostdata4));
	if (n == NULL)
	goto alloc_failed;

	memset(n, 0, sizeof (struct hostdata4));
	n->h_hostname = strdup(name);
	if (n->h_hostname == NULL)
	goto alloc_failed;

	((struct hostdata4 *)n)->h4_addr =
	(const struct in_addr )ipaddr;
	hashval = ((struct in_addr *)ipaddr)->s_addr;
	hp = (struct hostdata **)&h_table4[iphash(hashval)];
	break;
	case AF_INET6:
	n = (struct hostdata *)malloc(sizeof (struct hostdata6));
	if (n == NULL)
	goto alloc_failed;

	memset(n, 0, sizeof (struct hostdata6));
	n->h_hostname = strdup(name);
	if (n->h_hostname == NULL)
	goto alloc_failed;

	memcpy(&((struct hostdata6 *)n)->h6_addr, ipaddr,
	sizeof (struct in6_addr));
	hashval = ((const int *)ipaddr)[3];
	hp = (struct hostdata **)&h_table6[iphash(hashval)];
	break;
	default:
	fprintf(stderr, "snoop: ERROR: Unknown address family: %d",
	family);
	exit(1);
	}

	n->h_next = *hp;
	*hp = n;

	if (namefile != NULL) {
	if (family == AF_INET) {
	np = inet_ntoa((const struct in_addr )ipaddr);
	if (np) {
	(void) fprintf(namefile, "%s\t%s", np, name);
	if (aliases) {
	for (ind = 0;
	aliases[ind] != NULL;
	ind++) {
	(void) fprintf(namefile, " %s",
	aliases[ind]);
	}
	}
	(void) fprintf(namefile, "\n");
	}
	} else if (family == AF_INET6) {
	np = (char )inet_ntop(AF_INET6, (void )ipaddr, aname,
	sizeof (aname));
	if (np) {
	(void) fprintf(namefile, "%s\t%s", np, name);
	if (aliases) {
	for (ind = 0;
	aliases[ind] != NULL;
	ind++) {
	(void) fprintf(namefile, " %s",
	aliases[ind]);
	}
	}
	(void) fprintf(namefile, "\n");
	}
	} else {
	(void) fprintf(stderr, "addhost: unknown family %d\n",
	family);
	}
	}
	return (n);

	alloc_failed:
	if (n)
	free(n);
	(void) fprintf(stderr, "addhost: no mem\n");

	aname[0] = '\0';
	memset(&h, 0, sizeof (struct hostdata));
	h.h_hostname = aname;
	return (&h);
	}

	char *
	addrtoname(int family, const void *ipaddr)
	{
	switch (family) {
	case AF_INET:
	return (iplookup((const struct in_addr )ipaddr)->h_hostname);
	case AF_INET6:
	return (ip6lookup((const struct in6_addr *)ipaddr)->h_hostname);
	}
	(void) fprintf(stderr, "snoop: ERROR: unknown address family: %d\n",
	family);
	exit(1);
	/* NOTREACHED */
	}

	void
	load_names(fname)
	char *fname;
	{
	char buf[1024];
	char addr, name, *alias;
	FILE *f;
	unsigned int addrv4;
	struct in6_addr addrv6;
	int family;
	void *naddr;

	(void) fprintf(stderr, "Loading name file %s\n", fname);
	f = fopen(fname, "r");
	if (f == NULL) {
	perror(fname);
	return;
	}

	while (fgets(buf, 1024, f) != NULL) {
	addr = strtok(buf, SEPARATORS);
	if (addr == NULL \|\| *addr == '#')
	continue;
	if (inet_pton(AF_INET6, addr, (void *)&addrv6) == 1) {
	family = AF_INET6;
	naddr = (void *)&addrv6;
	} else if ((addrv4 = inet_addr(addr)) != (ulong_t)-1) {
	family = AF_INET;
	naddr = (void *)&addrv4;
	}
	name = strtok(NULL, SEPARATORS);
	if (name == NULL)
	continue;
	while ((alias = strtok(NULL, SEPARATORS)) != NULL &&
	(*alias != '#')) {
	(void) addhost(family, naddr, alias, NULL);
	}
	(void) addhost(family, naddr, name, NULL);
	/* Note: certain addresses such as broadcast are skipped */
	}

	(void) fclose(f);
	}

	/*
	* lgetipnodebyname: looks up hostname in cached address data. This allows
	* filtering on hostnames from the .names file to work properly, and
	* avoids name clashes between domains. Note that only the first of the
	* ipv4, ipv6, or v4mapped address will be returned, because the
	* cache does not contain information on multi-homed hosts.
	*/
	/ARGSUSED/
	struct hostent *
	lgetipnodebyname(const char name, int af, int flags, int error_num)
	{
	int i;
	struct hostdata4 *h;
	struct hostdata6 *h6;
	static struct hostent he; /* host entry */
	static struct in6_addr h46_addr[MAXADDRS]; /* v4mapped address */
	static char h_name[MAXHOSTNAMELEN]; /* hostname */
	static char list[MAXADDRS]; / addr_list array */
	struct hostent *hp = &he;
	int ind;

	(void) memset((char *)hp, 0, sizeof (struct hostent));
	hp->h_name = h_name;
	h_name[0] = '\0';
	strcpy(h_name, name);

	hp->h_addrtype = AF_INET6;

	hp->h_addr_list = list;
	for (i = 0; i < MAXADDRS; i++)
	hp->h_addr_list[i] = NULL;
	ind = 0;

	/* ipv6 lookup */
	if (af == AF_INET6) {
	hp->h_length = sizeof (struct in6_addr);
	for (i = 0; i < MAXHASH; i++) {
	for (h6 = h_table6[i]; h6; h6 = h6->h6_next) {
	if (strcmp(name, h6->h6_hostname) == 0) {
	if (ind >= MAXADDRS - 1) {
	/* too many addresses */
	return (hp);
	}
	/* found ipv6 addr */
	hp->h_addr_list[ind] =
	(char *)&h6->h6_addr;
	ind++;
	}
	}
	}
	}
	/* ipv4 or v4mapped lookup */
	if (af == AF_INET \|\| (flags & AI_ALL)) {
	for (i = 0; i < MAXHASH; i++) {
	for (h = h_table4[i]; h; h = h->h4_next) {
	if (strcmp(name, h->h4_hostname) == 0) {
	if (ind >= MAXADDRS - 1) {
	/* too many addresses */
	return (hp);
	}
	if (af == AF_INET) {
	/* found ipv4 addr */
	hp->h_addrtype = AF_INET;
	hp->h_length =
	sizeof (struct in_addr);
	hp->h_addr_list[ind] =
	(char *)&h->h4_addr;
	ind++;
	} else {
	/* found v4mapped addr */
	hp->h_length =
	sizeof (struct in6_addr);
	hp->h_addr_list[ind] =
	(char *)&h46_addr[ind];
	IN6_INADDR_TO_V4MAPPED(
	&h->h4_addr,
	&h46_addr[ind]);
	ind++;
	}
	}
	}
	}
	}
	return (ind > 0 ? hp : NULL);
	}