1/* Copyright (C) 1996-2023 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#include <errno.h>
19#include <netinet/ether.h>
20#include <netinet/if_ether.h>
21#include <string.h>
22
23#include "../nss/nsswitch.h"
24
25/* Type of the lookup function we need here. */
26typedef int (*lookup_function) (const char *, struct etherent *, char *, int,
27 int *);
28
29int
30ether_hostton (const char *hostname, struct ether_addr *addr)
31{
32 nss_action_list nip;
33 union
34 {
35 lookup_function f;
36 void *ptr;
37 } fct;
38 int no_more;
39 enum nss_status status = NSS_STATUS_UNAVAIL;
40 struct etherent etherent;
41
42 no_more = __nss_ethers_lookup2 (&nip, "gethostton_r", NULL, &fct.ptr);
43
44 while (no_more == 0)
45 {
46 char buffer[1024];
47
48 status = (*fct.f) (hostname, &etherent, buffer, sizeof buffer, &errno);
49
50 no_more = __nss_next2 (&nip, "gethostton_r", NULL, &fct.ptr, status, 0);
51 }
52
53 if (status == NSS_STATUS_SUCCESS)
54 memcpy (addr, etherent.e_addr.ether_addr_octet,
55 sizeof (struct ether_addr));
56
57 return status == NSS_STATUS_SUCCESS ? 0 : -1;
58}
59