1 /* HOSTALIASES-based name resolution. Public legacy functions.
2 Copyright (C) 2017-2021 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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 <https://www.gnu.org/licenses/>. */
18
19 #include <netdb.h>
20 #include <resolv-internal.h>
21 #include <resolv_context.h>
22
23 /* Common part of res_hostalias and hostalias. */
24 static const char *
context_hostalias_common(struct resolv_context * ctx,const char * name,char * dst,size_t siz)25 context_hostalias_common (struct resolv_context *ctx,
26 const char *name, char *dst, size_t siz)
27 {
28 if (ctx == NULL)
29 {
30 RES_SET_H_ERRNO (&_res, NETDB_INTERNAL);
31 return NULL;
32 }
33 const char *result = __res_context_hostalias (ctx, name, dst, siz);
34 __resolv_context_put (ctx);
35 return result;
36 }
37
38 const char *
res_hostalias(res_state statp,const char * name,char * dst,size_t siz)39 res_hostalias (res_state statp, const char *name, char *dst, size_t siz)
40 {
41 return context_hostalias_common
42 (__resolv_context_get_override (statp), name, dst, siz);
43 }
44
45 const char *
hostalias(const char * name)46 hostalias (const char *name)
47 {
48 static char abuf[MAXDNAME];
49 return context_hostalias_common
50 (__resolv_context_get (), name, abuf, sizeof (abuf));
51 }
52