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390500b1 | 1 | /* Copyright (C) 1996, 1997, 1999 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 UD |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | License, or (at your option) any later version. | |
6dbe2837 | 9 | |
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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 | Library General Public License for more details. | |
6dbe2837 | 14 | |
afd4eb37 UD |
15 | You should have received a copy of the GNU Library General Public |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
6dbe2837 RM |
19 | |
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 | |
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26 | |
27 | /* Type of the lookup function we need here. */ | |
28 | typedef int (*lookup_function) (const struct ether_addr *, struct etherent *, | |
29 | char *, int); | |
30 | ||
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31 | /* The lookup function for the first entry of this service. */ |
32 | extern int __nss_ethers_lookup (service_user **nip, const char *name, | |
33 | void **fctp); | |
34 | ||
6dbe2837 RM |
35 | |
36 | int | |
37 | ether_ntohost (char *hostname, const struct ether_addr *addr) | |
38 | { | |
390500b1 | 39 | static service_user *startp; |
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40 | static lookup_function start_fct; |
41 | service_user *nip; | |
42 | lookup_function fct; | |
43 | int no_more; | |
6dbe2837 RM |
44 | enum nss_status status = NSS_STATUS_UNAVAIL; |
45 | struct etherent etherent; | |
46 | ||
47 | if (startp == NULL) | |
48 | { | |
49 | no_more = __nss_ethers_lookup (&nip, "getntohost_r", (void **) &fct); | |
50 | if (no_more) | |
51 | startp = (service_user *) -1; | |
52 | else | |
53 | { | |
54 | startp = nip; | |
55 | start_fct = fct; | |
56 | } | |
57 | } | |
58 | else | |
59 | { | |
60 | fct = start_fct; | |
61 | no_more = (nip = startp) == (service_user *) -1; | |
62 | } | |
63 | ||
64 | while (no_more == 0) | |
65 | { | |
66 | char buffer[1024]; | |
67 | ||
68 | status = (*fct) (addr, ðerent, buffer, sizeof buffer); | |
69 | ||
70 | no_more = __nss_next (&nip, "getntohost_r", (void **) &fct, status, 0); | |
71 | } | |
72 | ||
73 | if (status == NSS_STATUS_SUCCESS) | |
74 | /* XXX This is a potential cause of trouble because the size of | |
75 | the HOSTNAME buffer is not known but the interface does not | |
76 | provide this information. */ | |
77 | strcpy (hostname, etherent.e_name); | |
78 | ||
79 | return status == NSS_STATUS_SUCCESS ? 0 : -1; | |
80 | } |