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/*
* Copyright (c) 2004, 2005 Apple Computer, Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
#ifndef __DNSINFO_PRIVATE_H__
#define __DNSINFO_PRIVATE_H__
#include <AvailabilityMacros.h>
#include <sys/cdefs.h>
#include <stdint.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <mach/mach.h>
#include "dnsinfo.h"
#if MAC_OS_X_VERSION_MAX_ALLOWED >= 1040
/*
* What's all of this stuff about???
*
* In order to minimize the amount of data conversions associated with
* storing, retrieving, and accessing the systems DNS configuration I
* have opted to create a memory image filled with the actual data
* types / structures that would be used by those applications which
* make use of these APIS. The implication here is that we use
* sockaddr's for addresses, char *'s for strings, etc.
*
* To achieve this goal the APIs which are used to store and access the
* configuration data build and use a single buffer of the relevant
* bits. When multiple instances of a given type / structure are needed
* we maintain a count, the actual data, and when the configuration has
* been unpacked, arrays of pointers to the data.
*
* In memory, the data looks as follows:
*
* +-------------------------------------------------------------------+
* | struct _dns_config_buf_t |
* +-+-------------+---------------------------------------------------+
* | | config | struct dns_config_t |
* | | +-+--------------+----------------------------------+
* | | | | n_resolver | int32_t | <- # of name resolvers
* | | | +--------------+----------------------------------+
* | | | | resolver | dns_resolver_t ** | <- not used during creation, filled
* | | | | | | in with pointer to a list of
* | | | | | | resolver configurations which be
* | | | | | | established in the "padding"
* | | | +--------------+----------------------------------+
* | | | | ... | ... |
* | +-------------+-+--------------+----------------------------------+
* | | n_attribute | uint32_t | <- how many bytes of "attribute"
* | | | | data is associated with the
* | | | | configuration
* |-+-------------+---------------------------------------------------+
* | | n_padding | uint32_t | <- how many additional bytes
* | | | | for arrays (of pointers), ...
* +-+-------------+---------------------------------------------------+
* | struct dns_attribute_t |
* |-+-------------+---------------------------------------------------+
* | | type | uint32_t | <- type of attribute (e.g. CONFIG_ATTRIBUTE_RESOLVER)
* | +-------------+---------------------------------------------------+
* | | length | uint32_t | <- length of the attribute
* | +-------------+---------------------------------------------------+
* | | attribute | struct _dns_resolver_buf_t | <- the attribute data (resolver configuration #1)
* | | +-+-------------+-----------------------------------+
* | | | | resolver | struct dns_resolver_t |
* | | | | +--------------+--------------------+
* | | | | | domain | char * | <- not used during creation,
* | | | | | | | filled in with pointer to
* | | | | | | | domain name in the "padding"
* | | | | +--------------+--------------------+
* | | | | | n_nameserver | int32_t | <- # of name server addresses
* | | | | +--------------+--------------------+
* | | | | | nameserver | struct sockaddr ** | <- not used during creation,
* | | | | | | | filled in with pointer to
* | | | | | | | a list of addresses which
* | | | | | | | will be established in the
* | | | | | | | "padding"
* | | | | +--------------+--------------------+
* | | | | | ... |
* | | +-+-------------+--------------+--------------------+
* | | | | n_attribute | uint32_t |
* | | +-+-------------+-----------------------------------+
* | | | | attribute | struct dns_attribute_t |
* | | | | +-+-----------+---------------------+
* | | | | | | type | uint32_t | <- type of attribute (e.g. RESOLVER_ATTRIBUTE_DOMAIN)
* | | | | | +-----------+---------------------+
* | | | | | | length | uint32_t | <- length of the attribute
* | | | | | +-----------+---------------------+
* | | | | | | attribute | | <- the attribute data ("apple.com")
* | | +-+-------------+-------------+---------------------+
* | | | | attribute | struct dns_attribute_t |
* | | | | +-+-----------+---------------------+
* | | | | | | type | uint32_t | <- type of attribute (e.g. RESOLVER_ATTRIBUTE_ADDRESS)
* | | | | | +-----------+---------------------+
* | | | | | | length | uint32_t | <- length of the attribute
* | | | | | +-----------+---------------------+
* | | | | | | attribute | | <- the attribute data ("struct sockaddr_in" #1)
* | | +---------------+-----------------------------------+
* | | | | attribute | struct dns_attribute_t |
* | | | | +-+-----------+---------------------+
* | | | | | | type | uint32_t | <- type of attribute (e.g. RESOLVER_ATTRIBUTE_ADDRESS)
* | | | | | +-----------+---------------------+
* | | | | | | length | uint32_t | <- length of the attribute
* | | | | | +-----------+---------------------+
* | | | | | | attribute | | <- the attribute data ("struct sockaddr_in" #2)
* | | +---------------+-----------------------------------+
* | | | ... |
* +-+-------------+---------------------------------------------------+
* | | attribute | struct _dns_resolver_buf_t | <- the attribute data (resolver configuration #2)
* | | +---------------+-----------------------------------+
* | | | ... |
* +---------------+---------------------------------------------------+
* | | ... |
* +---------------+---------------------------------------------------+
*
* When the data is unpacked the "n_padding" additional bytes
* specified in configuration buffer will be allocated at the
* end of this buffer. Arrays of pointers will be allocated
* within the extra space array element (an "attribute") is
* encountered the pointer reference will be filled in.
*/
// configuration buffer attributes
enum {
CONFIG_ATTRIBUTE_RESOLVER = 1
};
// resolver buffer attributes
enum {
RESOLVER_ATTRIBUTE_DOMAIN = 10,
RESOLVER_ATTRIBUTE_ADDRESS,
RESOLVER_ATTRIBUTE_SEARCH,
RESOLVER_ATTRIBUTE_SORTADDR,
RESOLVER_ATTRIBUTE_OPTIONS
};
typedef struct {
uint32_t type;
uint32_t length;
uint8_t attribute[0];
} dns_attribute_t;
typedef struct {
dns_config_t config;
uint32_t n_attribute;
uint32_t n_padding;
uint8_t attribute[0];
} _dns_config_buf_t;
typedef struct {
dns_resolver_t resolver;
uint32_t n_attribute;
uint8_t attribute[0];
} _dns_resolver_buf_t;
__BEGIN_DECLS
const char * _dns_configuration_notify_key() AVAILABLE_MAC_OS_X_VERSION_10_4_AND_LATER;
mach_port_t _dns_configuration_server_port() AVAILABLE_MAC_OS_X_VERSION_10_4_AND_LATER;
__END_DECLS
#endif /* MAC_OS_X_VERSION_MAX_ALLOWED >= 1040 */
#endif /* __DNSINFO_PRIVATE_H__ */
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