diff --git a/src/lib/thirdparty/apple/dnsinfo.h b/src/lib/thirdparty/apple/dnsinfo.h
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+++ b/src/lib/thirdparty/apple/dnsinfo.h
@@ -0,0 +1,128 @@
+/*
+ * Copyright (c) 2004-2006, 2008, 2009, 2011-2013, 2015-2018 Apple 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_H__
+#define __DNSINFO_H__
+
+/*
+ * These routines provide access to the systems DNS configuration
+ */
+
+#include <os/availability.h>
+#include <sys/cdefs.h>
+#include <stdint.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+#define	DNSINFO_VERSION		20170629
+
+#define DEFAULT_SEARCH_ORDER    200000   /* search order for the "default" resolver domain name */
+
+#define	DNS_PTR(type, name)				\
+	union {						\
+		type		name;			\
+		uint64_t	_ ## name ## _p;	\
+	}
+
+#define	DNS_VAR(type, name)				\
+	type	name
+
+
+#pragma pack(4)
+typedef struct {
+	struct in_addr	address;
+	struct in_addr	mask;
+} dns_sortaddr_t;
+#pragma pack()
+
+
+#pragma pack(4)
+typedef struct {
+	DNS_PTR(char *,			domain);	/* domain */
+	DNS_VAR(int32_t,		n_nameserver);	/* # nameserver */
+	DNS_PTR(struct sockaddr **,	nameserver);
+	DNS_VAR(uint16_t,		port);		/* port (in host byte order) */
+	DNS_VAR(int32_t,		n_search);	/* # search */
+	DNS_PTR(char **,		search);
+	DNS_VAR(int32_t,		n_sortaddr);	/* # sortaddr */
+	DNS_PTR(dns_sortaddr_t **,	sortaddr);
+	DNS_PTR(char *,			options);	/* options */
+	DNS_VAR(uint32_t,		timeout);	/* timeout */
+	DNS_VAR(uint32_t,		search_order);	/* search_order */
+	DNS_VAR(uint32_t,		if_index);
+	DNS_VAR(uint32_t,		flags);
+	DNS_VAR(uint32_t,		reach_flags);	/* SCNetworkReachabilityFlags */
+	DNS_VAR(uint32_t,		service_identifier);
+	DNS_PTR(char *,			cid);		/* configuration identifer */
+	DNS_PTR(char *,			if_name);	/* if_index interface name */
+} dns_resolver_t;
+#pragma pack()
+
+
+#define DNS_RESOLVER_FLAGS_REQUEST_A_RECORDS	0x0002		/* always requesting for A dns records in queries */
+#define DNS_RESOLVER_FLAGS_REQUEST_AAAA_RECORDS	0x0004		/* always requesting for AAAA dns records in queries */
+
+#define	DNS_RESOLVER_FLAGS_REQUEST_ALL_RECORDS	\
+	(DNS_RESOLVER_FLAGS_REQUEST_A_RECORDS | DNS_RESOLVER_FLAGS_REQUEST_AAAA_RECORDS)
+
+#define DNS_RESOLVER_FLAGS_SCOPED		0x1000		/* configuration is for scoped questions */
+#define DNS_RESOLVER_FLAGS_SERVICE_SPECIFIC	0x2000		/* configuration is service-specific */
+#define DNS_RESOLVER_FLAGS_SUPPLEMENTAL		0x4000		/* supplemental match configuration */
+
+
+#pragma pack(4)
+typedef struct {
+	DNS_VAR(int32_t,		n_resolver);		/* resolver configurations */
+	DNS_PTR(dns_resolver_t **,	resolver);
+	DNS_VAR(int32_t,		n_scoped_resolver);	/* "scoped" resolver configurations */
+	DNS_PTR(dns_resolver_t **,	scoped_resolver);
+	DNS_VAR(uint64_t,		generation);
+	DNS_VAR(int32_t,		n_service_specific_resolver);
+	DNS_PTR(dns_resolver_t **,	service_specific_resolver);
+	DNS_VAR(uint32_t,		version);
+} dns_config_t;
+#pragma pack()
+
+
+__BEGIN_DECLS
+
+/*
+ * DNS configuration access APIs
+ */
+const char *
+dns_configuration_notify_key    (void)				API_AVAILABLE(macos(10.4), ios(2.0));
+
+dns_config_t *
+dns_configuration_copy		(void)				API_AVAILABLE(macos(10.4), ios(2.0));
+
+void
+dns_configuration_free		(dns_config_t	*config)	API_AVAILABLE(macos(10.4), ios(2.0));
+
+void
+_dns_configuration_ack		(dns_config_t	*config,
+				 const char	*bundle_id)	API_AVAILABLE(macos(10.8), ios(6.0));
+
+__END_DECLS
+
+#endif	/* __DNSINFO_H__ */
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