minix/lib/libc/net/sethostent.c

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/* $NetBSD: sethostent.c,v 1.19 2013/08/27 09:56:12 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 1.19 2013/08/27 09:56:12 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"
#ifdef __weak_alias
__weak_alias(sethostent,_sethostent)
__weak_alias(endhostent,_endhostent)
#endif
#ifndef _REENTRANT
void res_close(void);
#endif
static struct hostent *_hf_gethtbyname2(const char *, int, struct getnamaddr *);
void
/*ARGSUSED*/
sethostent(int stayopen)
{
#ifndef _REENTRANT
if ((_res.options & RES_INIT) == 0 && res_init() == -1)
return;
if (stayopen)
_res.options |= RES_STAYOPEN | RES_USEVC;
#endif
sethostent_r(&_h_file);
}
void
endhostent(void)
{
#ifndef _REENTRANT
_res.options &= ~(RES_STAYOPEN | RES_USEVC);
res_close();
#endif
endhostent_r(&_h_file);
}
static const char *_h_hosts = _PATH_HOSTS;
void
_hf_sethostsfile(const char *f) {
_h_hosts = f;
}
void
sethostent_r(FILE **hf)
{
if (!*hf)
*hf = fopen(_h_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) {
*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;
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 = gethostent_r(hf, info->hp, info->buf, info->buflen,
info->he);
if (hp == NULL)
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 >= __arraycount(aliases))
goto nospc;
HENT_SCOPY(aliases[anum], hp->h_aliases[anum],
ptr, len);
}
ptr = (void *)ALIGN(ptr);
if ((size_t)(ptr - buf) >= info->buflen)
goto nospc;
}
if (num >= __arraycount(addr_ptrs))
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;
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;
return hp;
nospc:
*info->he = NETDB_INTERNAL;
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 = 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) {
*info->he = HOST_NOT_FOUND;
return NS_NOTFOUND;
}
return NS_SUCCESS;
}