[apple/mdnsresponder.git] / mDNSMacOSX / DNS64State.h

/*
 * Copyright (c) 2017 Apple Inc. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef __DNS64State_h
#define __DNS64State_h

typedef enum
{
    kDNS64State_Initial             = 0,    // Initial state.
    kDNS64State_PrefixDiscovery     = 1,    // Querying for "ipv4only.arpa." AAAA records to discover NAT64 IPv6 prefix(es).
    kDNS64State_PrefixDiscoveryPTR  = 2,    // Same as PrefixDiscovery, but discoverying for "ip6.arpa." PTR record queries.
    kDNS64State_QueryA              = 3,    // Querying for A record with same QNAME as AAAA record query.
    kDNS64State_QueryA2             = 4,    // Continuing A record query after being answered with a synthesizable A record.
    kDNS64State_QueryAAAA           = 5,    // Querying for original AAAA record.
    kDNS64State_QueryPTR            = 6,    // Determining whether to query for reverse IPV4 or reverse IPv6 PTR record.
    kDNS64State_ReverseIPv4         = 7,    // Querying for reverse IPV4 (in-addr.arpa.) PTR record.
    kDNS64State_ReverseIPv6         = 8     // Querying for the original reverse IPv6 (ip6.arpa.) PTR record.

}   DNS64State;

typedef struct
{
    DNS64State      state;          // Current state.
    mDNSu8          qnameStash[15]; // Temporary space to hold the up to 15 bytes that are displaced in a DNSQuestion's qname
                                    // when it's set to "ipv4only.arpa." during prefix discovery.
}   DNS64;

#endif // __DNS64State_h
Commit	Line	Data
12c5fa7a A	1	/*
	2	* Copyright (c) 2017 Apple Inc. All rights reserved.
	3	*
	4	* Licensed under the Apache License, Version 2.0 (the "License");
	5	* you may not use this file except in compliance with the License.
	6	* You may obtain a copy of the License at
	7	*
	8	* http://www.apache.org/licenses/LICENSE-2.0
	9	*
	10	* Unless required by applicable law or agreed to in writing, software
	11	* distributed under the License is distributed on an "AS IS" BASIS,
	12	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	13	* See the License for the specific language governing permissions and
	14	* limitations under the License.
	15	*/
	16
	17	#ifndef __DNS64State_h
	18	#define __DNS64State_h
	19
	20	typedef enum
	21	{
	22	kDNS64State_Initial = 0, // Initial state.
	23	kDNS64State_PrefixDiscovery = 1, // Querying for "ipv4only.arpa." AAAA records to discover NAT64 IPv6 prefix(es).
	24	kDNS64State_PrefixDiscoveryPTR = 2, // Same as PrefixDiscovery, but discoverying for "ip6.arpa." PTR record queries.
	25	kDNS64State_QueryA = 3, // Querying for A record with same QNAME as AAAA record query.
	26	kDNS64State_QueryA2 = 4, // Continuing A record query after being answered with a synthesizable A record.
	27	kDNS64State_QueryAAAA = 5, // Querying for original AAAA record.
	28	kDNS64State_QueryPTR = 6, // Determining whether to query for reverse IPV4 or reverse IPv6 PTR record.
	29	kDNS64State_ReverseIPv4 = 7, // Querying for reverse IPV4 (in-addr.arpa.) PTR record.
	30	kDNS64State_ReverseIPv6 = 8 // Querying for the original reverse IPv6 (ip6.arpa.) PTR record.
	31
	32	} DNS64State;
	33
	34	typedef struct
	35	{
	36	DNS64State state; // Current state.
	37	mDNSu8 qnameStash[15]; // Temporary space to hold the up to 15 bytes that are displaced in a DNSQuestion's qname
	38	// when it's set to "ipv4only.arpa." during prefix discovery.
	39	} DNS64;
	40
	41	#endif // __DNS64State_h