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[glibc/history.git] / inet / ether_hton.c
blob64f5ab5d3658d7c6d7ab63fb97eab00b86eb8879
1 /* Copyright (C) 1996, 1999, 2002 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
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.
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.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
20 #include <errno.h>
21 #include <netinet/ether.h>
22 #include <netinet/if_ether.h>
23 #include <string.h>
25 #include "../nss/nsswitch.h"
27 /* Type of the lookup function we need here. */
28 typedef int (*lookup_function) (const char *, struct etherent *, char *, int,
29 int *);
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) internal_function;
36 int
37 ether_hostton (const char *hostname, struct ether_addr *addr)
39 static service_user *startp;
40 static lookup_function start_fct;
41 service_user *nip;
42 union
44 lookup_function f;
45 void *ptr;
46 } fct;
47 int no_more;
48 enum nss_status status = NSS_STATUS_UNAVAIL;
49 struct etherent etherent;
51 if (startp == NULL)
53 no_more = __nss_ethers_lookup (&nip, "gethostton_r", &fct.ptr);
54 if (no_more)
55 startp = (service_user *) -1;
56 else
58 startp = nip;
59 start_fct = fct.f;
62 else
64 fct.f = start_fct;
65 no_more = (nip = startp) == (service_user *) -1;
68 while (no_more == 0)
70 char buffer[1024];
72 status = (*fct.f) (hostname, &etherent, buffer, sizeof buffer, &errno);
74 no_more = __nss_next (&nip, "gethostton_r", &fct.ptr, status, 0);
77 if (status == NSS_STATUS_SUCCESS)
78 memcpy (addr, etherent.e_addr.ether_addr_octet,
79 sizeof (struct ether_addr));
81 return status == NSS_STATUS_SUCCESS ? 0 : -1;