mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-11 22:00:08 +00:00
62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
/* Copyright (C) 1996-2024 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
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, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <errno.h>
|
|
#include <netinet/ether.h>
|
|
#include <netinet/if_ether.h>
|
|
#include <string.h>
|
|
|
|
#include <nsswitch.h>
|
|
|
|
|
|
/* Type of the lookup function we need here. */
|
|
typedef int (*lookup_function) (const struct ether_addr *, struct etherent *,
|
|
char *, size_t, int *);
|
|
|
|
int
|
|
ether_ntohost (char *hostname, const struct ether_addr *addr)
|
|
{
|
|
nss_action_list nip;
|
|
union
|
|
{
|
|
lookup_function f;
|
|
void *ptr;
|
|
} fct;
|
|
int no_more;
|
|
enum nss_status status = NSS_STATUS_UNAVAIL;
|
|
struct etherent etherent;
|
|
|
|
no_more = __nss_ethers_lookup2 (&nip, "getntohost_r", NULL, &fct.ptr);
|
|
|
|
while (no_more == 0)
|
|
{
|
|
char buffer[1024];
|
|
|
|
status = (*fct.f) (addr, ðerent, buffer, sizeof buffer, &errno);
|
|
|
|
no_more = __nss_next2 (&nip, "getntohost_r", NULL, &fct.ptr, 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;
|
|
}
|