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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef NET_DNS_DNS_PROTOCOL_H_ | |
| 6 #define NET_DNS_DNS_PROTOCOL_H_ | |
| 7 | |
| 8 #include "base/basictypes.h" | |
| 9 #include "net/base/net_export.h" | |
| 10 | |
| 11 namespace net { | |
| 12 | |
| 13 namespace dns_protocol { | |
| 14 | |
| 15 static const uint16 kDefaultPort = 53; | |
| 16 static const uint16 kDefaultPortMulticast = 5353; | |
| 17 | |
| 18 // DNS packet consists of a header followed by questions and/or answers. | |
| 19 // For the meaning of specific fields, please see RFC 1035 and 2535 | |
| 20 | |
| 21 // Header format. | |
| 22 // 1 1 1 1 1 1 | |
| 23 // 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 | |
| 24 // +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | |
| 25 // | ID | | |
| 26 // +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | |
| 27 // |QR| Opcode |AA|TC|RD|RA| Z|AD|CD| RCODE | | |
| 28 // +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | |
| 29 // | QDCOUNT | | |
| 30 // +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | |
| 31 // | ANCOUNT | | |
| 32 // +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | |
| 33 // | NSCOUNT | | |
| 34 // +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | |
| 35 // | ARCOUNT | | |
| 36 // +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | |
| 37 | |
| 38 // Question format. | |
| 39 // 1 1 1 1 1 1 | |
| 40 // 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 | |
| 41 // +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | |
| 42 // | | | |
| 43 // / QNAME / | |
| 44 // / / | |
| 45 // +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | |
| 46 // | QTYPE | | |
| 47 // +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | |
| 48 // | QCLASS | | |
| 49 // +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | |
| 50 | |
| 51 // Answer format. | |
| 52 // 1 1 1 1 1 1 | |
| 53 // 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 | |
| 54 // +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | |
| 55 // | | | |
| 56 // / / | |
| 57 // / NAME / | |
| 58 // | | | |
| 59 // +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | |
| 60 // | TYPE | | |
| 61 // +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | |
| 62 // | CLASS | | |
| 63 // +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | |
| 64 // | TTL | | |
| 65 // | | | |
| 66 // +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | |
| 67 // | RDLENGTH | | |
| 68 // +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--| | |
| 69 // / RDATA / | |
| 70 // / / | |
| 71 // +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | |
| 72 | |
| 73 #pragma pack(push) | |
| 74 #pragma pack(1) | |
| 75 | |
| 76 // On-the-wire header. All uint16 are in network order. | |
| 77 // Used internally in DnsQuery and DnsResponseParser. | |
| 78 struct NET_EXPORT_PRIVATE Header { | |
| 79 uint16 id; | |
| 80 uint16 flags; | |
| 81 uint16 qdcount; | |
| 82 uint16 ancount; | |
| 83 uint16 nscount; | |
| 84 uint16 arcount; | |
| 85 }; | |
| 86 | |
| 87 #pragma pack(pop) | |
| 88 | |
| 89 static const uint8 kLabelMask = 0xc0; | |
| 90 static const uint8 kLabelPointer = 0xc0; | |
| 91 static const uint8 kLabelDirect = 0x0; | |
| 92 static const uint16 kOffsetMask = 0x3fff; | |
| 93 | |
| 94 // In MDns the most significant bit of the rrclass is designated as the | |
| 95 // "cache-flush bit", as described in http://www.rfc-editor.org/rfc/rfc6762.txt | |
| 96 // section 10.2. | |
| 97 static const uint16 kMDnsClassMask = 0x7FFF; | |
| 98 | |
| 99 static const int kMaxNameLength = 255; | |
| 100 | |
| 101 // RFC 1035, section 4.2.1: Messages carried by UDP are restricted to 512 | |
| 102 // bytes (not counting the IP nor UDP headers). | |
| 103 static const int kMaxUDPSize = 512; | |
| 104 | |
| 105 // RFC 6762, section 17: Messages over the local link are restricted by the | |
| 106 // medium's MTU, and must be under 9000 bytes | |
| 107 static const int kMaxMulticastSize = 9000; | |
| 108 | |
| 109 // DNS class types. | |
| 110 static const uint16 kClassIN = 1; | |
| 111 | |
| 112 // DNS resource record types. See | |
| 113 // http://www.iana.org/assignments/dns-parameters | |
| 114 static const uint16 kTypeA = 1; | |
| 115 static const uint16 kTypeCNAME = 5; | |
| 116 static const uint16 kTypePTR = 12; | |
| 117 static const uint16 kTypeTXT = 16; | |
| 118 static const uint16 kTypeAAAA = 28; | |
| 119 static const uint16 kTypeSRV = 33; | |
| 120 static const uint16 kTypeNSEC = 47; | |
| 121 | |
| 122 | |
| 123 // DNS rcode values. | |
| 124 static const uint8 kRcodeMask = 0xf; | |
| 125 static const uint8 kRcodeNOERROR = 0; | |
| 126 static const uint8 kRcodeFORMERR = 1; | |
| 127 static const uint8 kRcodeSERVFAIL = 2; | |
| 128 static const uint8 kRcodeNXDOMAIN = 3; | |
| 129 static const uint8 kRcodeNOTIMP = 4; | |
| 130 static const uint8 kRcodeREFUSED = 5; | |
| 131 | |
| 132 // DNS flags. | |
| 133 static const uint16 kFlagResponse = 0x8000; | |
| 134 static const uint16 kFlagRA = 0x80; | |
| 135 static const uint16 kFlagRD = 0x100; | |
| 136 static const uint16 kFlagTC = 0x200; | |
| 137 static const uint16 kFlagAA = 0x400; | |
| 138 | |
| 139 } // namespace dns_protocol | |
| 140 | |
| 141 } // namespace net | |
| 142 | |
| 143 #endif // NET_DNS_DNS_PROTOCOL_H_ | |
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Chromium Code Reviews
Issue 992733002:
Remove //net (except for Android test stuff) and sdch (Closed)
Base URL: git@github.com:domokit/mojo.git@master