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Side by Side Diff: net/quic/crypto/crypto_handshake_message.h

Issue 992733002: Remove //net (except for Android test stuff) and sdch (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: Created 5 years, 9 months ago
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1 // Copyright (c) 2013 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_QUIC_CRYPTO_CRYPTO_HANDSHAKE_MESSAGE_H_
6 #define NET_QUIC_CRYPTO_CRYPTO_HANDSHAKE_MESSAGE_H_
7
8 #include <string>
9 #include <vector>
10
11 #include "base/memory/scoped_ptr.h"
12 #include "base/strings/string_piece.h"
13 #include "net/base/net_export.h"
14 #include "net/quic/quic_protocol.h"
15
16 namespace net {
17
18 // An intermediate format of a handshake message that's convenient for a
19 // CryptoFramer to serialize from or parse into.
20 class NET_EXPORT_PRIVATE CryptoHandshakeMessage {
21 public:
22 CryptoHandshakeMessage();
23 CryptoHandshakeMessage(const CryptoHandshakeMessage& other);
24 ~CryptoHandshakeMessage();
25
26 CryptoHandshakeMessage& operator=(const CryptoHandshakeMessage& other);
27
28 // Clears state.
29 void Clear();
30
31 // GetSerialized returns the serialized form of this message and caches the
32 // result. Subsequently altering the message does not invalidate the cache.
33 const QuicData& GetSerialized() const;
34
35 // MarkDirty invalidates the cache created by |GetSerialized|.
36 void MarkDirty();
37
38 // SetValue sets an element with the given tag to the raw, memory contents of
39 // |v|.
40 template<class T> void SetValue(QuicTag tag, const T& v) {
41 tag_value_map_[tag] =
42 std::string(reinterpret_cast<const char*>(&v), sizeof(v));
43 }
44
45 // SetVector sets an element with the given tag to the raw contents of an
46 // array of elements in |v|.
47 template<class T> void SetVector(QuicTag tag, const std::vector<T>& v) {
48 if (v.empty()) {
49 tag_value_map_[tag] = std::string();
50 } else {
51 tag_value_map_[tag] = std::string(reinterpret_cast<const char*>(&v[0]),
52 v.size() * sizeof(T));
53 }
54 }
55
56 // Returns the message tag.
57 QuicTag tag() const { return tag_; }
58 // Sets the message tag.
59 void set_tag(QuicTag tag) { tag_ = tag; }
60
61 const QuicTagValueMap& tag_value_map() const { return tag_value_map_; }
62
63 // SetTaglist sets an element with the given tag to contain a list of tags,
64 // passed as varargs. The argument list must be terminated with a 0 element.
65 void SetTaglist(QuicTag tag, ...);
66
67 void SetStringPiece(QuicTag tag, base::StringPiece value);
68
69 // Erase removes a tag/value, if present, from the message.
70 void Erase(QuicTag tag);
71
72 // GetTaglist finds an element with the given tag containing zero or more
73 // tags. If such a tag doesn't exist, it returns false. Otherwise it sets
74 // |out_tags| and |out_len| to point to the array of tags and returns true.
75 // The array points into the CryptoHandshakeMessage and is valid only for as
76 // long as the CryptoHandshakeMessage exists and is not modified.
77 QuicErrorCode GetTaglist(QuicTag tag, const QuicTag** out_tags,
78 size_t* out_len) const;
79
80 bool GetStringPiece(QuicTag tag, base::StringPiece* out) const;
81
82 // GetNthValue24 interprets the value with the given tag to be a series of
83 // 24-bit, length prefixed values and it returns the subvalue with the given
84 // index.
85 QuicErrorCode GetNthValue24(QuicTag tag,
86 unsigned index,
87 base::StringPiece* out) const;
88 QuicErrorCode GetUint16(QuicTag tag, uint16* out) const;
89 QuicErrorCode GetUint32(QuicTag tag, uint32* out) const;
90 QuicErrorCode GetUint64(QuicTag tag, uint64* out) const;
91
92 // size returns 4 (message tag) + 2 (uint16, number of entries) +
93 // (4 (tag) + 4 (end offset))*tag_value_map_.size() + ∑ value sizes.
94 size_t size() const;
95
96 // set_minimum_size sets the minimum number of bytes that the message should
97 // consume. The CryptoFramer will add a PAD tag as needed when serializing in
98 // order to ensure this. Setting a value of 0 disables padding.
99 //
100 // Padding is useful in order to ensure that messages are a minimum size. A
101 // QUIC server can require a minimum size in order to reduce the
102 // amplification factor of any mirror DoS attack.
103 void set_minimum_size(size_t min_bytes);
104
105 size_t minimum_size() const;
106
107 // DebugString returns a multi-line, string representation of the message
108 // suitable for including in debug output.
109 std::string DebugString() const;
110
111 private:
112 // GetPOD is a utility function for extracting a plain-old-data value. If
113 // |tag| exists in the message, and has a value of exactly |len| bytes then
114 // it copies |len| bytes of data into |out|. Otherwise |len| bytes at |out|
115 // are zeroed out.
116 //
117 // If used to copy integers then this assumes that the machine is
118 // little-endian.
119 QuicErrorCode GetPOD(QuicTag tag, void* out, size_t len) const;
120
121 std::string DebugStringInternal(size_t indent) const;
122
123 QuicTag tag_;
124 QuicTagValueMap tag_value_map_;
125
126 size_t minimum_size_;
127
128 // The serialized form of the handshake message. This member is constructed
129 // lasily.
130 mutable scoped_ptr<QuicData> serialized_;
131 };
132
133 } // namespace net
134
135 #endif // NET_QUIC_CRYPTO_CRYPTO_HANDSHAKE_MESSAGE_H_
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