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b168057a | 1 | /* Copyright (C) 1996-2015 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 | |
afd4eb37 UD |
31 | /* The lookup function for the first entry of this service. */ |
32 | extern int __nss_ethers_lookup (service_user **nip, const char *name, | |
f7ddf3d3 | 33 | void **fctp) internal_function; |
afd4eb37 | 34 | |
6dbe2837 RM |
35 | |
36 | int | |
37 | ether_ntohost (char *hostname, const struct ether_addr *addr) | |
38 | { | |
390500b1 | 39 | static service_user *startp; |
6dbe2837 RM |
40 | static lookup_function start_fct; |
41 | service_user *nip; | |
fb776f3e AJ |
42 | union |
43 | { | |
44 | lookup_function f; | |
45 | void *ptr; | |
46 | } fct; | |
6dbe2837 | 47 | int no_more; |
6dbe2837 RM |
48 | enum nss_status status = NSS_STATUS_UNAVAIL; |
49 | struct etherent etherent; | |
50 | ||
51 | if (startp == NULL) | |
52 | { | |
fb776f3e | 53 | no_more = __nss_ethers_lookup (&nip, "getntohost_r", &fct.ptr); |
6dbe2837 RM |
54 | if (no_more) |
55 | startp = (service_user *) -1; | |
56 | else | |
57 | { | |
58 | startp = nip; | |
fb776f3e | 59 | start_fct = fct.f; |
6dbe2837 RM |
60 | } |
61 | } | |
62 | else | |
63 | { | |
fb776f3e | 64 | fct.f = start_fct; |
6dbe2837 RM |
65 | no_more = (nip = startp) == (service_user *) -1; |
66 | } | |
67 | ||
68 | while (no_more == 0) | |
69 | { | |
70 | char buffer[1024]; | |
71 | ||
fb776f3e | 72 | status = (*fct.f) (addr, ðerent, buffer, sizeof buffer, &errno); |
6dbe2837 | 73 | |
384ca551 | 74 | no_more = __nss_next2 (&nip, "getntohost_r", NULL, &fct.ptr, status, 0); |
6dbe2837 RM |
75 | } |
76 | ||
77 | if (status == NSS_STATUS_SUCCESS) | |
78 | /* XXX This is a potential cause of trouble because the size of | |
79 | the HOSTNAME buffer is not known but the interface does not | |
80 | provide this information. */ | |
81 | strcpy (hostname, etherent.e_name); | |
82 | ||
83 | return status == NSS_STATUS_SUCCESS ? 0 : -1; | |
84 | } |