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04277e02 | 1 | /* Copyright (C) 1996-2019 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 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://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 | { | |
390500b1 | 34 | static service_user *startp; |
6dbe2837 RM |
35 | static lookup_function start_fct; |
36 | service_user *nip; | |
fb776f3e AJ |
37 | union |
38 | { | |
39 | lookup_function f; | |
40 | void *ptr; | |
41 | } fct; | |
6dbe2837 | 42 | int no_more; |
6dbe2837 RM |
43 | enum nss_status status = NSS_STATUS_UNAVAIL; |
44 | struct etherent etherent; | |
45 | ||
46 | if (startp == NULL) | |
47 | { | |
c88ffc23 | 48 | no_more = __nss_ethers_lookup2 (&nip, "getntohost_r", NULL, &fct.ptr); |
6dbe2837 RM |
49 | if (no_more) |
50 | startp = (service_user *) -1; | |
51 | else | |
52 | { | |
53 | startp = nip; | |
fb776f3e | 54 | start_fct = fct.f; |
6dbe2837 RM |
55 | } |
56 | } | |
57 | else | |
58 | { | |
fb776f3e | 59 | fct.f = start_fct; |
6dbe2837 RM |
60 | no_more = (nip = startp) == (service_user *) -1; |
61 | } | |
62 | ||
63 | while (no_more == 0) | |
64 | { | |
65 | char buffer[1024]; | |
66 | ||
fb776f3e | 67 | status = (*fct.f) (addr, ðerent, buffer, sizeof buffer, &errno); |
6dbe2837 | 68 | |
384ca551 | 69 | no_more = __nss_next2 (&nip, "getntohost_r", NULL, &fct.ptr, status, 0); |
6dbe2837 RM |
70 | } |
71 | ||
72 | if (status == NSS_STATUS_SUCCESS) | |
73 | /* XXX This is a potential cause of trouble because the size of | |
74 | the HOSTNAME buffer is not known but the interface does not | |
75 | provide this information. */ | |
76 | strcpy (hostname, etherent.e_name); | |
77 | ||
78 | return status == NSS_STATUS_SUCCESS ? 0 : -1; | |
79 | } |