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resolv: Introduce struct resolv_context [BZ #21668]

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struct resolv_context objects provide a temporary resolver context
which does not change during a name lookup operation.  Only when the
outmost context is created, the stub resolver configuration is
verified to be current (at present, only against previous res_init
calls).  Subsequent attempts to obtain the context will reuse the
result of the initial verification operation.

struct resolv_context can also be extended in the future to store
data which needs to be deallocated during thread cancellation.
This commit is contained in:
Florian Weimer
2017-06-30 21:10:23 +02:00
parent 4e45d83c92
commit 352f4ff9a2
24 changed files with 1032 additions and 370 deletions
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49
resolv/res_use_inet6.h Normal file
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/* Support functions for handling RES_USE_INET6 in getaddrinfo/nscd.
Copyright (C) 2017 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/>. */
#ifndef _RES_USE_INET6_H
#define _RES_USE_INET6_H
#include <resolv/resolv_context.h>
#include <resolv/resolv-internal.h>
/* Ensure that RES_USE_INET6 is disabled in *CTX. Return true if
__resolv_context_enable_inet6 below should enable RES_USE_INET6
again. */
static inline bool
__resolv_context_disable_inet6 (struct resolv_context *ctx)
{
if (ctx != NULL && ctx->resp->options & DEPRECATED_RES_USE_INET6)
{
ctx->resp->options &= ~DEPRECATED_RES_USE_INET6;
return true;
}
else
return false;
}
/* If ENABLE, re-enable RES_USE_INET6 in *CTX. To be paired with
__resolv_context_disable_inet6. */
static inline void
__resolv_context_enable_inet6 (struct resolv_context *ctx, bool enable)
{
if (ctx != NULL && enable)
ctx->resp->options |= DEPRECATED_RES_USE_INET6;
}
#endif