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hesiod: Always use thread-local resolver state [BZ #19573]

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The Hesiod implementation imported into glibc was enhanced
to support caller-supplied resolver states.  But its only
consumer is nss_hesiod, and it supplies the thread-local
resolver state.  Therefore, this commit changes the Hesiod
implementation to use the thread-local resolver state (_res)
directly.  This fixes bug 19573 because the Hesiod
implementation no longer has to initialize and free any
resolver state.

To avoid any risk of interposition of ABI-incompatible Hesiod
function implementations, this commit marks the Hesiod functions
as hidden.  (They were already hidden using a linker version
script.)
This commit is contained in:
Florian Weimer
2016-05-02 15:25:20 +02:00
parent 46cb402c6d
commit 5018f16c62
11 changed files with 89 additions and 156 deletions
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30
hesiod/hesiod.h
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@@ -1,3 +1,20 @@
/* Copyright (C) 1997-2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
/*
* Copyright (c) 1996,1999 by Internet Software Consortium.
*
@@ -22,15 +39,12 @@
#ifndef _HESIOD_H_INCLUDED
#define _HESIOD_H_INCLUDED
int hesiod_init (void **context);
void hesiod_end (void *context);
int hesiod_init (void **context) attribute_hidden;
void hesiod_end (void *context) attribute_hidden;
char * hesiod_to_bind (void *context, const char *name,
const char *type);
const char *type) attribute_hidden;
char ** hesiod_resolve (void *context, const char *name,
const char *type);
void hesiod_free_list (void *context, char **list);
struct __res_state * __hesiod_res_get (void *context);
void __hesiod_res_set (void *context, struct __res_state *,
void (*)(void *));
const char *type) attribute_hidden;
void hesiod_free_list (void *context, char **list) attribute_hidden;
#endif /*_HESIOD_H_INCLUDED*/