mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-29 05:51:10 +00:00
108 lines
4.1 KiB
C
108 lines
4.1 KiB
C
/* Extended resolver state separate from struct __res_state.
|
|
Copyright (C) 2017-2023 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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef RESOLV_STATE_H
|
|
#define RESOLV_STATE_H
|
|
|
|
#include <netinet/in.h>
|
|
#include <stdbool.h>
|
|
#include <stddef.h>
|
|
|
|
/* This type corresponds to members of the _res.sort_list array. */
|
|
struct resolv_sortlist_entry
|
|
{
|
|
struct in_addr addr;
|
|
uint32_t mask;
|
|
};
|
|
|
|
/* Extended resolver state associated with res_state objects. Client
|
|
code can reach this state through a struct resolv_context
|
|
object. */
|
|
struct resolv_conf
|
|
{
|
|
/* Reference counter. The object is deallocated once it reaches
|
|
zero. For internal use within resolv_conf only. */
|
|
size_t __refcount;
|
|
|
|
/* List of IPv4 and IPv6 name server addresses. */
|
|
const struct sockaddr **nameserver_list;
|
|
size_t nameserver_list_size;
|
|
|
|
/* The domain names forming the search list. */
|
|
const char *const *search_list;
|
|
size_t search_list_size;
|
|
|
|
/* IPv4 address preference rules. */
|
|
const struct resolv_sortlist_entry *sort_list;
|
|
size_t sort_list_size;
|
|
|
|
/* _res.options has type unsigned long, but we can only use 32 bits
|
|
for portability across all architectures. */
|
|
unsigned int options;
|
|
unsigned int retrans; /* Timeout. */
|
|
unsigned int retry; /* Number of times to retry. */
|
|
unsigned int ndots; /* Dots needed for initial non-search query. */
|
|
};
|
|
|
|
/* The functions below are for use by the res_init resolv.conf parser
|
|
and the struct resolv_context facility. */
|
|
|
|
struct __res_state;
|
|
struct file_change_detection;
|
|
|
|
/* Read /etc/resolv.conf and return a configuration object, or NULL if
|
|
/etc/resolv.conf cannot be read due to memory allocation errors.
|
|
If PREINIT is not NULL, some configuration values are taken from
|
|
the struct __res_state object. If CHANGE is not null, file change
|
|
detection data is written to *CHANGE, based on the state of the
|
|
file after reading it. */
|
|
struct resolv_conf *__resolv_conf_load (struct __res_state *preinit,
|
|
struct file_change_detection *change)
|
|
attribute_hidden __attribute__ ((warn_unused_result));
|
|
|
|
/* Return a configuration object for the current /etc/resolv.conf
|
|
settings, or NULL on failure. The object is cached. */
|
|
struct resolv_conf *__resolv_conf_get_current (void)
|
|
attribute_hidden __attribute__ ((warn_unused_result));
|
|
|
|
/* Return the extended resolver state for *RESP, or NULL if it cannot
|
|
be determined. A call to this function must be paired with a call
|
|
to __resolv_conf_put. */
|
|
struct resolv_conf *__resolv_conf_get (struct __res_state *) attribute_hidden;
|
|
|
|
/* Converse of __resolv_conf_get. */
|
|
void __resolv_conf_put (struct resolv_conf *) attribute_hidden;
|
|
|
|
/* Allocate a new struct resolv_conf object and copy the
|
|
pre-configured values from *INIT. Return NULL on allocation
|
|
failure. The object must be deallocated using
|
|
__resolv_conf_put. */
|
|
struct resolv_conf *__resolv_conf_allocate (const struct resolv_conf *init)
|
|
attribute_hidden __attribute__ ((nonnull (1), warn_unused_result));
|
|
|
|
/* Associate an existing extended resolver state with *RESP. Return
|
|
false on allocation failure. In addition, update *RESP with the
|
|
overlapping non-extended resolver state. */
|
|
bool __resolv_conf_attach (struct __res_state *, struct resolv_conf *)
|
|
attribute_hidden;
|
|
|
|
/* Detach the extended resolver state from *RESP. */
|
|
void __resolv_conf_detach (struct __res_state *resp) attribute_hidden;
|
|
|
|
#endif /* RESOLV_STATE_H */
|