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/*
* 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
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