libc/dns/net/sethostent.c - android_bionic - Gitiles

 /*	$NetBSD: sethostent.c,v 1.20 2014/03/17 13:24:23 christos Exp $	*/

 /*
  * 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:
  * 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. 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.
  */

 #include <sys/cdefs.h>
 #if defined(LIBC_SCCS) && !defined(lint)
 #if 0
 static char sccsid[] = "@(#)sethostent.c	8.1 (Berkeley) 6/4/93";
 static char rcsid[] = "Id: sethostent.c,v 8.5 1996/09/28 06:51:07 vixie Exp ";
 #else
 __RCSID("$NetBSD: sethostent.c,v 1.20 2014/03/17 13:24:23 christos Exp $");
 #endif
 #endif /* LIBC_SCCS and not lint */

 #include "namespace.h"
 #include <sys/param.h>
 #include <netinet/in.h>
 #include <arpa/nameser.h>
 #include <arpa/inet.h>
 #include <assert.h>
 #include <string.h>
 #include <nsswitch.h>
 #include <netdb.h>
 #include <resolv.h>
 #include <errno.h>
 #include <stdlib.h>

 #include "hostent.h"
 #include "resolv_private.h"

 #ifndef _REENTRANT
 void	res_close(void);
 #endif

 static struct hostent *_hf_gethtbyname2(const char *, int, struct getnamaddr *);

 void
 /*ARGSUSED*/
 sethostent(int stayopen)
 {
 	struct res_static* rs = __res_get_static();
 	if (rs) sethostent_r(&rs->hostf);
 }

 void
 endhostent(void)
 {
 	struct res_static* rs = __res_get_static();
 	if (rs) endhostent_r(&rs->hostf);
 }

 void
 sethostent_r(FILE **hf)
 {
 	if (!*hf)
 		*hf = fopen(_PATH_HOSTS, "re");
 	else
 		rewind(*hf);
 }

 void
 endhostent_r(FILE **hf)
 {
 	if (*hf) {
 		(void)fclose(*hf);
 		*hf = NULL;
 	}
 }

 /*ARGSUSED*/
 int
 _hf_gethtbyname(void *rv, void *cb_data, va_list ap)
 {
 	struct hostent *hp;
 	const char *name;
 	int af;
 	struct getnamaddr *info = rv;

 	_DIAGASSERT(rv != NULL);

 	name = va_arg(ap, char *);
 	/* NOSTRICT skip string len */(void)va_arg(ap, int);
 	af = va_arg(ap, int);

 #if 0
 	{
 		res_state res = __res_get_state();
 		if (res == NULL)
 			return NS_NOTFOUND;
 		if (res->options & RES_USE_INET6)
 			hp = _hf_gethtbyname2(name, AF_INET6, info);
 		else
 			hp = NULL;
 		if (hp == NULL)
 			hp = _hf_gethtbyname2(name, AF_INET, info);
 		__res_put_state(res);
 	}
 #else
 	hp = _hf_gethtbyname2(name, af, info);
 #endif
 	if (hp == NULL) {
 		if (*info->he == NETDB_INTERNAL && errno == ENOSPC) {
 			return NS_UNAVAIL; // glibc compatibility.
 		}
 		*info->he = HOST_NOT_FOUND;
 		return NS_NOTFOUND;
 	}
 	return NS_SUCCESS;
 }

 struct hostent *
 _hf_gethtbyname2(const char *name, int af, struct getnamaddr *info)
 {
 	struct hostent *hp, hent;
 	char *buf, *ptr;
 	size_t len, anum, num, i;
 	FILE *hf;
 	char *aliases[MAXALIASES];
 	char *addr_ptrs[MAXADDRS];

 	_DIAGASSERT(name != NULL);

 	hf = NULL;
 	sethostent_r(&hf);
 	if (hf == NULL) {
 		errno = EINVAL;
 		*info->he = NETDB_INTERNAL;
 		return NULL;
 	}

 	if ((ptr = buf = malloc(len = info->buflen)) == NULL) {
 		*info->he = NETDB_INTERNAL;
 		endhostent_r(&hf);
 		return NULL;
 	}

 	anum = 0;		/* XXX: gcc */
 	hent.h_name = NULL;	/* XXX: gcc */
 	hent.h_addrtype = 0;	/* XXX: gcc */
 	hent.h_length = 0;	/* XXX: gcc */

 	for (num = 0; num < MAXADDRS;) {
 		info->hp->h_addrtype = af;
 		info->hp->h_length = 0;

 		hp = netbsd_gethostent_r(hf, info->hp, info->buf, info->buflen,
 		    info->he);
 		if (hp == NULL) {
 			if (*info->he == NETDB_INTERNAL && errno == ENOSPC) {
 				goto nospc; // glibc compatibility.
 			}
 			break;
 		}

 		if (strcasecmp(hp->h_name, name) != 0) {
 			char **cp;
 			for (cp = hp->h_aliases; *cp != NULL; cp++)
 				if (strcasecmp(*cp, name) == 0)
 					break;
 			if (*cp == NULL) continue;
 		}

 		if (num == 0) {
 			hent.h_addrtype = af = hp->h_addrtype;
 			hent.h_length = hp->h_length;

 			HENT_SCOPY(hent.h_name, hp->h_name, ptr, len);
 			for (anum = 0; hp->h_aliases[anum]; anum++) {
 				if (anum >= MAXALIASES)
 					goto nospc;
 				HENT_SCOPY(aliases[anum], hp->h_aliases[anum],
 				    ptr, len);
 			}
 			ptr = __builtin_align_up(ptr, sizeof(uintptr_t));
 			if ((size_t)(ptr - buf) >= info->buflen)
 				goto nospc;
 		}

 		if (num >= MAXADDRS)
 			goto nospc;
 		HENT_COPY(addr_ptrs[num], hp->h_addr_list[0], hp->h_length, ptr,
 		    len);
 		num++;
 	}
 	endhostent_r(&hf);

 	if (num == 0) {
 		*info->he = HOST_NOT_FOUND;
 		free(buf);
 		return NULL;
 	}

 	hp = info->hp;
 	ptr = info->buf;
 	len = info->buflen;

 	hp->h_addrtype = hent.h_addrtype;
 	hp->h_length = hent.h_length;

 	HENT_ARRAY(hp->h_aliases, anum, ptr, len);
 	HENT_ARRAY(hp->h_addr_list, num, ptr, len);

 	for (i = 0; i < num; i++)
 		HENT_COPY(hp->h_addr_list[i], addr_ptrs[i], hp->h_length, ptr,
 		    len);
 	hp->h_addr_list[num] = NULL;

 	HENT_SCOPY(hp->h_name, hent.h_name, ptr, len);

 	for (i = 0; i < anum; i++)
 		HENT_SCOPY(hp->h_aliases[i], aliases[i], ptr, len);
 	hp->h_aliases[anum] = NULL;

 	free(buf);
 	return hp;
 nospc:
 	*info->he = NETDB_INTERNAL;
 	endhostent_r(&hf);
 	free(buf);
 	errno = ENOSPC;
 	return NULL;
 }

 /*ARGSUSED*/
 int
 _hf_gethtbyaddr(void *rv, void *cb_data, va_list ap)
 {
 	struct hostent *hp;
 	const unsigned char *addr;
 	struct getnamaddr *info = rv;
 	FILE *hf;

 	_DIAGASSERT(rv != NULL);

 	addr = va_arg(ap, unsigned char *);
 	info->hp->h_length = va_arg(ap, int);
 	info->hp->h_addrtype = va_arg(ap, int);

 	hf = NULL;
 	sethostent_r(&hf);
 	if (hf == NULL) {
 		*info->he = NETDB_INTERNAL;
 		return NS_UNAVAIL;
 	}
 	while ((hp = netbsd_gethostent_r(hf, info->hp, info->buf, info->buflen,
 	    info->he)) != NULL)
 		if (!memcmp(hp->h_addr_list[0], addr, (size_t)hp->h_length))
 			break;
 	endhostent_r(&hf);

 	if (hp == NULL) {
 		if (errno == ENOSPC) return NS_UNAVAIL; // glibc compatibility.
 		*info->he = HOST_NOT_FOUND;
 		return NS_NOTFOUND;
 	}
 	return NS_SUCCESS;
 }
	/* $NetBSD: sethostent.c,v 1.20 2014/03/17 13:24:23 christos Exp $ */

	/*
	* 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:
	* 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. 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.
	*/

	#include <sys/cdefs.h>
	#if defined(LIBC_SCCS) && !defined(lint)
	#if 0
	static char sccsid[] = "@(#)sethostent.c 8.1 (Berkeley) 6/4/93";
	static char rcsid[] = "Id: sethostent.c,v 8.5 1996/09/28 06:51:07 vixie Exp ";
	#else
	__RCSID("$NetBSD: sethostent.c,v 1.20 2014/03/17 13:24:23 christos Exp $");
	#endif
	#endif /* LIBC_SCCS and not lint */

	#include "namespace.h"
	#include <sys/param.h>
	#include <netinet/in.h>
	#include <arpa/nameser.h>
	#include <arpa/inet.h>
	#include <assert.h>
	#include <string.h>
	#include <nsswitch.h>
	#include <netdb.h>
	#include <resolv.h>
	#include <errno.h>
	#include <stdlib.h>

	#include "hostent.h"
	#include "resolv_private.h"

	#ifndef _REENTRANT
	void res_close(void);
	#endif

	static struct hostent _hf_gethtbyname2(const char , int, struct getnamaddr *);

	void
	/ARGSUSED/
	sethostent(int stayopen)
	{
	struct res_static* rs = __res_get_static();
	if (rs) sethostent_r(&rs->hostf);
	}

	void
	endhostent(void)
	{
	struct res_static* rs = __res_get_static();
	if (rs) endhostent_r(&rs->hostf);
	}

	void
	sethostent_r(FILE **hf)
	{
	if (!*hf)
	*hf = fopen(_PATH_HOSTS, "re");
	else
	rewind(*hf);
	}

	void
	endhostent_r(FILE **hf)
	{
	if (*hf) {
	(void)fclose(*hf);
	*hf = NULL;
	}
	}

	/ARGSUSED/
	int
	_hf_gethtbyname(void rv, void cb_data, va_list ap)
	{
	struct hostent *hp;
	const char *name;
	int af;
	struct getnamaddr *info = rv;

	_DIAGASSERT(rv != NULL);

	name = va_arg(ap, char *);
	/* NOSTRICT skip string len */(void)va_arg(ap, int);
	af = va_arg(ap, int);

	#if 0
	{
	res_state res = __res_get_state();
	if (res == NULL)
	return NS_NOTFOUND;
	if (res->options & RES_USE_INET6)
	hp = _hf_gethtbyname2(name, AF_INET6, info);
	else
	hp = NULL;
	if (hp == NULL)
	hp = _hf_gethtbyname2(name, AF_INET, info);
	__res_put_state(res);
	}
	#else
	hp = _hf_gethtbyname2(name, af, info);
	#endif
	if (hp == NULL) {
	if (*info->he == NETDB_INTERNAL && errno == ENOSPC) {
	return NS_UNAVAIL; // glibc compatibility.
	}
	*info->he = HOST_NOT_FOUND;
	return NS_NOTFOUND;
	}
	return NS_SUCCESS;
	}

	struct hostent *
	_hf_gethtbyname2(const char name, int af, struct getnamaddr info)
	{
	struct hostent *hp, hent;
	char buf, ptr;
	size_t len, anum, num, i;
	FILE *hf;
	char *aliases[MAXALIASES];
	char *addr_ptrs[MAXADDRS];

	_DIAGASSERT(name != NULL);

	hf = NULL;
	sethostent_r(&hf);
	if (hf == NULL) {
	errno = EINVAL;
	*info->he = NETDB_INTERNAL;
	return NULL;
	}

	if ((ptr = buf = malloc(len = info->buflen)) == NULL) {
	*info->he = NETDB_INTERNAL;
	endhostent_r(&hf);
	return NULL;
	}

	anum = 0; /* XXX: gcc */
	hent.h_name = NULL; /* XXX: gcc */
	hent.h_addrtype = 0; /* XXX: gcc */
	hent.h_length = 0; /* XXX: gcc */

	for (num = 0; num < MAXADDRS;) {
	info->hp->h_addrtype = af;
	info->hp->h_length = 0;

	hp = netbsd_gethostent_r(hf, info->hp, info->buf, info->buflen,
	info->he);
	if (hp == NULL) {
	if (*info->he == NETDB_INTERNAL && errno == ENOSPC) {
	goto nospc; // glibc compatibility.
	}
	break;
	}

	if (strcasecmp(hp->h_name, name) != 0) {
	char **cp;
	for (cp = hp->h_aliases; *cp != NULL; cp++)
	if (strcasecmp(*cp, name) == 0)
	break;
	if (*cp == NULL) continue;
	}

	if (num == 0) {
	hent.h_addrtype = af = hp->h_addrtype;
	hent.h_length = hp->h_length;

	HENT_SCOPY(hent.h_name, hp->h_name, ptr, len);
	for (anum = 0; hp->h_aliases[anum]; anum++) {
	if (anum >= MAXALIASES)
	goto nospc;
	HENT_SCOPY(aliases[anum], hp->h_aliases[anum],
	ptr, len);
	}
	ptr = __builtin_align_up(ptr, sizeof(uintptr_t));
	if ((size_t)(ptr - buf) >= info->buflen)
	goto nospc;
	}

	if (num >= MAXADDRS)
	goto nospc;
	HENT_COPY(addr_ptrs[num], hp->h_addr_list[0], hp->h_length, ptr,
	len);
	num++;
	}
	endhostent_r(&hf);

	if (num == 0) {
	*info->he = HOST_NOT_FOUND;
	free(buf);
	return NULL;
	}

	hp = info->hp;
	ptr = info->buf;
	len = info->buflen;

	hp->h_addrtype = hent.h_addrtype;
	hp->h_length = hent.h_length;

	HENT_ARRAY(hp->h_aliases, anum, ptr, len);
	HENT_ARRAY(hp->h_addr_list, num, ptr, len);

	for (i = 0; i < num; i++)
	HENT_COPY(hp->h_addr_list[i], addr_ptrs[i], hp->h_length, ptr,
	len);
	hp->h_addr_list[num] = NULL;

	HENT_SCOPY(hp->h_name, hent.h_name, ptr, len);

	for (i = 0; i < anum; i++)
	HENT_SCOPY(hp->h_aliases[i], aliases[i], ptr, len);
	hp->h_aliases[anum] = NULL;

	free(buf);
	return hp;
	nospc:
	*info->he = NETDB_INTERNAL;
	endhostent_r(&hf);
	free(buf);
	errno = ENOSPC;
	return NULL;
	}

	/ARGSUSED/
	int
	_hf_gethtbyaddr(void rv, void cb_data, va_list ap)
	{
	struct hostent *hp;
	const unsigned char *addr;
	struct getnamaddr *info = rv;
	FILE *hf;

	_DIAGASSERT(rv != NULL);

	addr = va_arg(ap, unsigned char *);
	info->hp->h_length = va_arg(ap, int);
	info->hp->h_addrtype = va_arg(ap, int);

	hf = NULL;
	sethostent_r(&hf);
	if (hf == NULL) {
	*info->he = NETDB_INTERNAL;
	return NS_UNAVAIL;
	}
	while ((hp = netbsd_gethostent_r(hf, info->hp, info->buf, info->buflen,
	info->he)) != NULL)
	if (!memcmp(hp->h_addr_list[0], addr, (size_t)hp->h_length))
	break;
	endhostent_r(&hf);

	if (hp == NULL) {
	if (errno == ENOSPC) return NS_UNAVAIL; // glibc compatibility.
	*info->he = HOST_NOT_FOUND;
	return NS_NOTFOUND;
	}
	return NS_SUCCESS;
	}