1 /* Copyright (C) 1996, 1997, 1999, 2001, 2002 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
21 #include <netinet/ether.h>
22 #include <netinet/if_ether.h>
25 #include <nss/nsswitch.h>
28 /* Type of the lookup function we need here. */
29 typedef int (*lookup_function) (const struct ether_addr *, struct etherent *,
30 char *, size_t, int *);
32 /* The lookup function for the first entry of this service. */
33 extern int __nss_ethers_lookup (service_user **nip, const char *name,
34 void **fctp) internal_function;
38 ether_ntohost (char *hostname, const struct ether_addr *addr)
40 static service_user *startp;
41 static lookup_function start_fct;
49 enum nss_status status = NSS_STATUS_UNAVAIL;
50 struct etherent etherent;
54 no_more = __nss_ethers_lookup (&nip, "getntohost_r", &fct.ptr);
56 startp = (service_user *) -1;
66 no_more = (nip = startp) == (service_user *) -1;
73 status = (*fct.f) (addr, ðerent, buffer, sizeof buffer, &errno);
75 no_more = __nss_next (&nip, "getntohost_r", &fct.ptr, status, 0);
78 if (status == NSS_STATUS_SUCCESS)
79 /* XXX This is a potential cause of trouble because the size of
80 the HOSTNAME buffer is not known but the interface does not
81 provide this information. */
82 strcpy (hostname, etherent.e_name);
84 return status == NSS_STATUS_SUCCESS ? 0 : -1;