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