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Side by Side Diff: net/dns/dns_protocol.h

Issue 15733008: Multicast DNS implementation (initial) (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@mdns_implementation2
Patch Set: Renamed files from "listener" to "client" Created 7 years, 6 months ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 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 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef NET_DNS_DNS_PROTOCOL_H_ 5 #ifndef NET_DNS_DNS_PROTOCOL_H_
6 #define NET_DNS_DNS_PROTOCOL_H_ 6 #define NET_DNS_DNS_PROTOCOL_H_
7 7
8 #include "base/basictypes.h" 8 #include "base/basictypes.h"
9 #include "net/base/net_export.h" 9 #include "net/base/net_export.h"
10 10
11 namespace net { 11 namespace net {
12 12
13 namespace dns_protocol { 13 namespace dns_protocol {
14 14
15 static const uint16 kDefaultPort = 53; 15 static const uint16 kDefaultPort = 53;
16 static const uint16 kDefaultPortMulticast = 5353;
16 17
17 // DNS packet consists of a header followed by questions and/or answers. 18 // DNS packet consists of a header followed by questions and/or answers.
18 // For the meaning of specific fields, please see RFC 1035 and 2535 19 // For the meaning of specific fields, please see RFC 1035 and 2535
19 20
20 // Header format. 21 // Header format.
21 // 1 1 1 1 1 1 22 // 1 1 1 1 1 1
22 // 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 23 // 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
23 // +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ 24 // +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
24 // | ID | 25 // | ID |
25 // +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ 26 // +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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94 // "cache-flush bit", as described in http://www.rfc-editor.org/rfc/rfc6762.txt 95 // "cache-flush bit", as described in http://www.rfc-editor.org/rfc/rfc6762.txt
95 // section 10.2. 96 // section 10.2.
96 static const uint16 kMDnsClassMask = 0x7FFF; 97 static const uint16 kMDnsClassMask = 0x7FFF;
97 98
98 static const int kMaxNameLength = 255; 99 static const int kMaxNameLength = 255;
99 100
100 // RFC 1035, section 4.2.1: Messages carried by UDP are restricted to 512 101 // RFC 1035, section 4.2.1: Messages carried by UDP are restricted to 512
101 // bytes (not counting the IP nor UDP headers). 102 // bytes (not counting the IP nor UDP headers).
102 static const int kMaxUDPSize = 512; 103 static const int kMaxUDPSize = 512;
103 104
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
104 // DNS class types. 109 // DNS class types.
105 static const uint16 kClassIN = 1; 110 static const uint16 kClassIN = 1;
106 111
107 // DNS resource record types. See 112 // DNS resource record types. See
108 // http://www.iana.org/assignments/dns-parameters 113 // http://www.iana.org/assignments/dns-parameters
109 static const uint16 kTypeA = 1; 114 static const uint16 kTypeA = 1;
110 static const uint16 kTypeCNAME = 5; 115 static const uint16 kTypeCNAME = 5;
111 static const uint16 kTypePTR = 12; 116 static const uint16 kTypePTR = 12;
112 static const uint16 kTypeTXT = 16; 117 static const uint16 kTypeTXT = 16;
113 static const uint16 kTypeAAAA = 28; 118 static const uint16 kTypeAAAA = 28;
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127 static const uint16 kFlagRA = 0x80; 132 static const uint16 kFlagRA = 0x80;
128 static const uint16 kFlagRD = 0x100; 133 static const uint16 kFlagRD = 0x100;
129 static const uint16 kFlagTC = 0x200; 134 static const uint16 kFlagTC = 0x200;
130 static const uint16 kFlagAA = 0x400; 135 static const uint16 kFlagAA = 0x400;
131 136
132 } // namespace dns_protocol 137 } // namespace dns_protocol
133 138
134 } // namespace net 139 } // namespace net
135 140
136 #endif // NET_DNS_DNS_PROTOCOL_H_ 141 #endif // NET_DNS_DNS_PROTOCOL_H_
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