1 | /* Copyright (C) 1996-2017 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 | <http://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 | /* The lookup function for the first entry of this service. */ |
31 | extern int __nss_ethers_lookup (service_user **nip, const char *name, |
32 | void **fctp) internal_function; |
33 | |
34 | |
35 | int |
36 | ether_hostton (const char *hostname, struct ether_addr *addr) |
37 | { |
38 | static service_user *startp; |
39 | static lookup_function start_fct; |
40 | service_user *nip; |
41 | union |
42 | { |
43 | lookup_function f; |
44 | void *ptr; |
45 | } fct; |
46 | int no_more; |
47 | enum nss_status status = NSS_STATUS_UNAVAIL; |
48 | struct etherent etherent; |
49 | |
50 | if (startp == NULL) |
51 | { |
52 | no_more = __nss_ethers_lookup (&nip, "gethostton_r" , &fct.ptr); |
53 | if (no_more) |
54 | startp = (service_user *) -1; |
55 | else |
56 | { |
57 | startp = nip; |
58 | start_fct = fct.f; |
59 | } |
60 | } |
61 | else |
62 | { |
63 | fct.f = start_fct; |
64 | no_more = (nip = startp) == (service_user *) -1; |
65 | } |
66 | |
67 | while (no_more == 0) |
68 | { |
69 | char buffer[1024]; |
70 | |
71 | status = (*fct.f) (hostname, ðerent, buffer, sizeof buffer, &errno); |
72 | |
73 | no_more = __nss_next2 (&nip, "gethostton_r" , NULL, &fct.ptr, status, 0); |
74 | } |
75 | |
76 | if (status == NSS_STATUS_SUCCESS) |
77 | memcpy (addr, etherent.e_addr.ether_addr_octet, |
78 | sizeof (struct ether_addr)); |
79 | |
80 | return status == NSS_STATUS_SUCCESS ? 0 : -1; |
81 | } |
82 | |