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+diff --git a/src/lib/thirdparty/apple/dnsinfo.h b/src/lib/thirdparty/apple/dnsinfo.h
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+new file mode 100644
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+index 0000000..e6a9ed1
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+--- /dev/null
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++++ b/src/lib/thirdparty/apple/dnsinfo.h
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+@@ -0,0 +1,128 @@
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++/*
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++ * Copyright (c) 2004-2006, 2008, 2009, 2011-2013, 2015-2018 Apple Inc. All rights reserved.
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++ *
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++ * @APPLE_LICENSE_HEADER_START@
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++ *
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++ * This file contains Original Code and/or Modifications of Original Code
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++ * as defined in and that are subject to the Apple Public Source License
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++ * Version 2.0 (the 'License'). You may not use this file except in
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++ * compliance with the License. Please obtain a copy of the License at
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++ * http://www.opensource.apple.com/apsl/ and read it before using this
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++ * file.
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++ *
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++ * The Original Code and all software distributed under the License are
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++ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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++ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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++ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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++ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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++ * Please see the License for the specific language governing rights and
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++ * limitations under the License.
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++ *
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++ * @APPLE_LICENSE_HEADER_END@
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++ */
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++
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++#ifndef __DNSINFO_H__
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++#define __DNSINFO_H__
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++
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++/*
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++ * These routines provide access to the systems DNS configuration
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++ */
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++
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++#include <os/availability.h>
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++#include <sys/cdefs.h>
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++#include <stdint.h>
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++#include <sys/types.h>
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++#include <sys/socket.h>
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++#include <netinet/in.h>
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++
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++#define DNSINFO_VERSION 20170629
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++
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++#define DEFAULT_SEARCH_ORDER 200000 /* search order for the "default" resolver domain name */
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++
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++#define DNS_PTR(type, name) \
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++ union { \
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++ type name; \
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++ uint64_t _ ## name ## _p; \
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++ }
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++
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++#define DNS_VAR(type, name) \
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++ type name
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++
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++
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++#pragma pack(4)
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++typedef struct {
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++ struct in_addr address;
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++ struct in_addr mask;
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++} dns_sortaddr_t;
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++#pragma pack()
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++
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++
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++#pragma pack(4)
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++typedef struct {
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++ DNS_PTR(char *, domain); /* domain */
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++ DNS_VAR(int32_t, n_nameserver); /* # nameserver */
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++ DNS_PTR(struct sockaddr **, nameserver);
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++ DNS_VAR(uint16_t, port); /* port (in host byte order) */
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++ DNS_VAR(int32_t, n_search); /* # search */
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++ DNS_PTR(char **, search);
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++ DNS_VAR(int32_t, n_sortaddr); /* # sortaddr */
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++ DNS_PTR(dns_sortaddr_t **, sortaddr);
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++ DNS_PTR(char *, options); /* options */
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++ DNS_VAR(uint32_t, timeout); /* timeout */
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++ DNS_VAR(uint32_t, search_order); /* search_order */
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++ DNS_VAR(uint32_t, if_index);
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++ DNS_VAR(uint32_t, flags);
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++ DNS_VAR(uint32_t, reach_flags); /* SCNetworkReachabilityFlags */
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++ DNS_VAR(uint32_t, service_identifier);
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++ DNS_PTR(char *, cid); /* configuration identifer */
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++ DNS_PTR(char *, if_name); /* if_index interface name */
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++} dns_resolver_t;
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++#pragma pack()
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++
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++
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++#define DNS_RESOLVER_FLAGS_REQUEST_A_RECORDS 0x0002 /* always requesting for A dns records in queries */
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++#define DNS_RESOLVER_FLAGS_REQUEST_AAAA_RECORDS 0x0004 /* always requesting for AAAA dns records in queries */
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++
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++#define DNS_RESOLVER_FLAGS_REQUEST_ALL_RECORDS \
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++ (DNS_RESOLVER_FLAGS_REQUEST_A_RECORDS | DNS_RESOLVER_FLAGS_REQUEST_AAAA_RECORDS)
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++
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++#define DNS_RESOLVER_FLAGS_SCOPED 0x1000 /* configuration is for scoped questions */
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++#define DNS_RESOLVER_FLAGS_SERVICE_SPECIFIC 0x2000 /* configuration is service-specific */
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++#define DNS_RESOLVER_FLAGS_SUPPLEMENTAL 0x4000 /* supplemental match configuration */
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++
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++
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++#pragma pack(4)
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++typedef struct {
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++ DNS_VAR(int32_t, n_resolver); /* resolver configurations */
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++ DNS_PTR(dns_resolver_t **, resolver);
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++ DNS_VAR(int32_t, n_scoped_resolver); /* "scoped" resolver configurations */
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++ DNS_PTR(dns_resolver_t **, scoped_resolver);
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++ DNS_VAR(uint64_t, generation);
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++ DNS_VAR(int32_t, n_service_specific_resolver);
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++ DNS_PTR(dns_resolver_t **, service_specific_resolver);
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++ DNS_VAR(uint32_t, version);
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++} dns_config_t;
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++#pragma pack()
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++
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++
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++__BEGIN_DECLS
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++
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++/*
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++ * DNS configuration access APIs
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++ */
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++const char *
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++dns_configuration_notify_key (void) API_AVAILABLE(macos(10.4), ios(2.0));
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++
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++dns_config_t *
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++dns_configuration_copy (void) API_AVAILABLE(macos(10.4), ios(2.0));
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++
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++void
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++dns_configuration_free (dns_config_t *config) API_AVAILABLE(macos(10.4), ios(2.0));
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++
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++void
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++_dns_configuration_ack (dns_config_t *config,
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++ const char *bundle_id) API_AVAILABLE(macos(10.8), ios(6.0));
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++
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++__END_DECLS
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++
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++#endif /* __DNSINFO_H__ */
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+\ No newline at end of file
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