Index: net/dns/dns_protocol.h |
diff --git a/net/dns/dns_protocol.h b/net/dns/dns_protocol.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..41dfd091f7a9fdbcfc7754986d21702a1d1b6688 |
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+++ b/net/dns/dns_protocol.h |
@@ -0,0 +1,121 @@ |
+// Copyright (c) 2011 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#ifndef NET_DNS_DNS_PROTOCOL_H_ |
+#define NET_DNS_DNS_PROTOCOL_H_ |
+#pragma once |
+ |
+#include "base/basictypes.h" |
+#include "net/base/bigendian.h" |
+#include "net/base/net_export.h" |
+ |
+namespace net { |
mmenke
2011/12/02 00:53:55
nit: Google style is to have an empty line here.
szym
2011/12/05 23:06:28
Done.
|
+namespace dns_protocol { |
+ |
+// DNS packet consists of a header followed by questions and/or answers. |
+// For the meaning of specific fields, please see RFC 1035 and 2535 |
+ |
+// Header format. |
+// 1 1 1 1 1 1 |
+// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 |
+// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ |
+// | ID | |
+// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ |
+// |QR| Opcode |AA|TC|RD|RA| Z|AD|CD| RCODE | |
+// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ |
+// | QDCOUNT | |
+// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ |
+// | ANCOUNT | |
+// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ |
+// | NSCOUNT | |
+// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ |
+// | ARCOUNT | |
+// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ |
+ |
+// Question format. |
+// 1 1 1 1 1 1 |
+// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 |
+// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ |
+// | | |
+// / QNAME / |
+// / / |
+// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ |
+// | QTYPE | |
+// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ |
+// | QCLASS | |
+// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ |
+ |
+// Answer format. |
+// 1 1 1 1 1 1 |
+// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 |
+// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ |
+// | | |
+// / / |
+// / NAME / |
+// | | |
+// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ |
+// | TYPE | |
+// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ |
+// | CLASS | |
+// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ |
+// | TTL | |
+// | | |
+// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ |
+// | RDLENGTH | |
+// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--| |
+// / RDATA / |
+// / / |
+// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ |
+ |
+#pragma pack(push) |
+#pragma pack(1) |
+ |
+// On-the-wire header. All uint16 are in network order. |
+// Used internally in DnsQuery and DnsResponseParser |
mmenke
2011/12/02 00:53:55
nit: Missing period.
szym
2011/12/05 23:06:28
Done.
|
+struct NET_EXPORT_PRIVATE Header { |
+ uint16 id; |
+ uint8 flags[2]; |
+ uint16 qdcount; |
+ uint16 ancount; |
+ uint16 nscount; |
+ uint16 arcount; |
+}; |
+ |
+#pragma pack(pop) |
+ |
+static const uint8 kLabelMask = 0xc0; |
+static const uint8 kLabelPointer = 0xc0; |
+static const uint8 kLabelDirect = 0x0; |
+static const uint16 kOffsetMask = 0x3fff; |
+ |
+static const int kMaxNameLength = 255; |
+ |
+// RFC 1035, section 4.2.1: Messages carried by UDP are restricted to 512 |
+// bytes (not counting the IP nor UDP headers). |
+static const int kMaxUDPSize = 512; |
+ |
+// DNS class types. |
+static const uint16 kClassIN = 1; |
+ |
+// DNS resource record types. See |
+// http://www.iana.org/assignments/dns-parameters |
+static const uint16 kTypeA = 1; |
+static const uint16 kTypeCNAME = 5; |
+static const uint16 kTypeTXT = 16; |
+static const uint16 kTypeAAAA = 28; |
+ |
+// DNS rcode values. |
+static const uint8 kRcodeMask = 0xf; |
+static const uint8 kRcodeNOERROR = 0; |
+static const uint8 kRcodeFORMERR = 1; |
+static const uint8 kRcodeSERVFAIL = 2; |
+static const uint8 kRcodeNXDOMAIN = 3; |
+static const uint8 kRcodeNOTIMP = 4; |
+static const uint8 kRcodeREFUSED = 5; |
+ |
+} // namespace dns_protocol |
mmenke
2011/12/02 00:53:55
nit: add a blank line.
szym
2011/12/05 23:06:28
Done.
|
+} // namespace net |
+ |
+#endif // NET_DNS_DNS_PROTOCOL_H_ |
+ |