glibc/inet/ether_ntoh.c
Andreas Jaeger 41bdb6e20c Update to LGPL v2.1.
2001-07-06  Paul Eggert  <eggert@twinsun.com>

	* manual/argp.texi: Remove ignored LGPL copyright notice; it's
	not appropriate for documentation anyway.
	* manual/libc-texinfo.sh: "Library General Public License" ->
	"Lesser General Public License".

2001-07-06  Andreas Jaeger  <aj@suse.de>

	* All files under GPL/LGPL version 2: Place under LGPL version
	2.1.
2001-07-06 04:58:11 +00:00

82 lines
2.4 KiB
C

/* Copyright (C) 1996, 1997, 1999, 2001 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <errno.h>
#include <netinet/ether.h>
#include <netinet/if_ether.h>
#include <string.h>
#include <nss/nsswitch.h>
/* Type of the lookup function we need here. */
typedef int (*lookup_function) (const struct ether_addr *, struct etherent *,
char *, size_t, int *);
/* The lookup function for the first entry of this service. */
extern int __nss_ethers_lookup (service_user **nip, const char *name,
void **fctp);
int
ether_ntohost (char *hostname, const struct ether_addr *addr)
{
static service_user *startp;
static lookup_function start_fct;
service_user *nip;
lookup_function fct;
int no_more;
enum nss_status status = NSS_STATUS_UNAVAIL;
struct etherent etherent;
if (startp == NULL)
{
no_more = __nss_ethers_lookup (&nip, "getntohost_r", (void **) &fct);
if (no_more)
startp = (service_user *) -1;
else
{
startp = nip;
start_fct = fct;
}
}
else
{
fct = start_fct;
no_more = (nip = startp) == (service_user *) -1;
}
while (no_more == 0)
{
char buffer[1024];
status = (*fct) (addr, &etherent, buffer, sizeof buffer, &errno);
no_more = __nss_next (&nip, "getntohost_r", (void **) &fct, status, 0);
}
if (status == NSS_STATUS_SUCCESS)
/* XXX This is a potential cause of trouble because the size of
the HOSTNAME buffer is not known but the interface does not
provide this information. */
strcpy (hostname, etherent.e_name);
return status == NSS_STATUS_SUCCESS ? 0 : -1;
}