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1 | /* Copyright (C) 1996-2020 Free Software Foundation, Inc. | |
2 | This file is part of the GNU C Library. | |
3 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. | |
4 | ||
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. | |
9 | ||
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. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <https://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <errno.h> | |
20 | #include <netinet/ether.h> | |
21 | #include <netinet/if_ether.h> | |
22 | #include <string.h> | |
23 | ||
24 | #include "../nss/nsswitch.h" | |
25 | ||
26 | /* Type of the lookup function we need here. */ | |
27 | typedef int (*lookup_function) (const char *, struct etherent *, char *, int, | |
28 | int *); | |
29 | ||
30 | int | |
31 | ether_hostton (const char *hostname, struct ether_addr *addr) | |
32 | { | |
33 | nss_action_list nip; | |
34 | union | |
35 | { | |
36 | lookup_function f; | |
37 | void *ptr; | |
38 | } fct; | |
39 | int no_more; | |
40 | enum nss_status status = NSS_STATUS_UNAVAIL; | |
41 | struct etherent etherent; | |
42 | ||
43 | no_more = __nss_ethers_lookup2 (&nip, "gethostton_r", NULL, &fct.ptr); | |
44 | ||
45 | while (no_more == 0) | |
46 | { | |
47 | char buffer[1024]; | |
48 | ||
49 | status = (*fct.f) (hostname, ðerent, buffer, sizeof buffer, &errno); | |
50 | ||
51 | no_more = __nss_next2 (&nip, "gethostton_r", NULL, &fct.ptr, status, 0); | |
52 | } | |
53 | ||
54 | if (status == NSS_STATUS_SUCCESS) | |
55 | memcpy (addr, etherent.e_addr.ether_addr_octet, | |
56 | sizeof (struct ether_addr)); | |
57 | ||
58 | return status == NSS_STATUS_SUCCESS ? 0 : -1; | |
59 | } |