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2b778ceb | 1 | /* Copyright (C) 1996-2021 Free Software Foundation, Inc. |
afd4eb37 UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. | |
6dbe2837 | 4 | |
afd4eb37 | 5 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
6dbe2837 | 9 | |
afd4eb37 UD |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
6dbe2837 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
6dbe2837 | 18 | |
3f738366 | 19 | #include <errno.h> |
6dbe2837 RM |
20 | #include <netinet/ether.h> |
21 | #include <netinet/if_ether.h> | |
84384f5b | 22 | #include <string.h> |
6dbe2837 | 23 | |
86187531 | 24 | #include <nss/nsswitch.h> |
6dbe2837 | 25 | |
6dbe2837 RM |
26 | |
27 | /* Type of the lookup function we need here. */ | |
28 | typedef int (*lookup_function) (const struct ether_addr *, struct etherent *, | |
3f738366 | 29 | char *, size_t, int *); |
6dbe2837 | 30 | |
6dbe2837 RM |
31 | int |
32 | ether_ntohost (char *hostname, const struct ether_addr *addr) | |
33 | { | |
f4f3b091 | 34 | nss_action_list nip; |
fb776f3e AJ |
35 | union |
36 | { | |
37 | lookup_function f; | |
38 | void *ptr; | |
39 | } fct; | |
6dbe2837 | 40 | int no_more; |
6dbe2837 RM |
41 | enum nss_status status = NSS_STATUS_UNAVAIL; |
42 | struct etherent etherent; | |
43 | ||
f4f3b091 | 44 | no_more = __nss_ethers_lookup2 (&nip, "getntohost_r", NULL, &fct.ptr); |
6dbe2837 RM |
45 | |
46 | while (no_more == 0) | |
47 | { | |
48 | char buffer[1024]; | |
49 | ||
fb776f3e | 50 | status = (*fct.f) (addr, ðerent, buffer, sizeof buffer, &errno); |
6dbe2837 | 51 | |
384ca551 | 52 | no_more = __nss_next2 (&nip, "getntohost_r", NULL, &fct.ptr, status, 0); |
6dbe2837 RM |
53 | } |
54 | ||
55 | if (status == NSS_STATUS_SUCCESS) | |
56 | /* XXX This is a potential cause of trouble because the size of | |
57 | the HOSTNAME buffer is not known but the interface does not | |
58 | provide this information. */ | |
59 | strcpy (hostname, etherent.e_name); | |
60 | ||
61 | return status == NSS_STATUS_SUCCESS ? 0 : -1; | |
62 | } |