1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
module Network.HTTP2.H2.Settings where
import Network.Control
import Imports
import Network.HTTP2.Frame
import Network.HTTP2.H2.EncodeFrame
----------------------------------------------------------------
-- | HTTP\/2 settings. See <https://datatracker.ietf.org/doc/html/rfc9113#name-defined-settings>.
data Settings = Settings
{ headerTableSize :: Int
-- ^ SETTINGS_HEADER_TABLE_SIZE
, enablePush :: Bool
-- ^ SETTINGS_ENABLE_PUSH
, maxConcurrentStreams :: Maybe Int
-- ^ SETTINGS_MAX_CONCURRENT_STREAMS
, initialWindowSize :: WindowSize
-- ^ SETTINGS_INITIAL_WINDOW_SIZE
, maxFrameSize :: Int
-- ^ SETTINGS_MAX_FRAME_SIZE
, maxHeaderListSize :: Maybe Int
-- ^ SETTINGS_MAX_HEADER_LIST_SIZE
, pingRateLimit :: Int
-- ^ Maximum number of pings allowed per second (CVE-2019-9512)
, emptyFrameRateLimit :: Int
-- ^ Maximum number of empty data frames allowed per second (CVE-2019-9518)
, settingsRateLimit :: Int
-- ^ Maximum number of settings frames allowed per second (CVE-2019-9515)
, rstRateLimit :: Int
-- ^ Maximum number of reset frames allowed per second (CVE-2023-44487)
}
deriving (Eq, Show)
-- | The default settings.
--
-- >>> baseSettings
-- Settings {headerTableSize = 4096, enablePush = True, maxConcurrentStreams = Nothing, initialWindowSize = 65535, maxFrameSize = 16384, maxHeaderListSize = Nothing, pingRateLimit = 10, emptyFrameRateLimit = 4, settingsRateLimit = 4, rstRateLimit = 4}
baseSettings :: Settings
baseSettings =
Settings
{ headerTableSize = 4096 -- defaultDynamicTableSize
, enablePush = True
, maxConcurrentStreams = Nothing
, initialWindowSize = defaultWindowSize -- 64K (65,535)
, maxFrameSize = defaultPayloadLength -- 2^14 (16,384)
, maxHeaderListSize = Nothing
, pingRateLimit = 10
, emptyFrameRateLimit = 4
, settingsRateLimit = 4
, rstRateLimit = 4
}
-- | The default settings.
--
-- >>> defaultSettings
-- Settings {headerTableSize = 4096, enablePush = True, maxConcurrentStreams = Just 64, initialWindowSize = 262144, maxFrameSize = 16384, maxHeaderListSize = Nothing, pingRateLimit = 10, emptyFrameRateLimit = 4, settingsRateLimit = 4, rstRateLimit = 4}
defaultSettings :: Settings
defaultSettings =
baseSettings
{ maxConcurrentStreams = Just defaultMaxStreams
, initialWindowSize = defaultMaxStreamData
}
----------------------------------------------------------------
-- | Updating settings.
--
-- >>> fromSettingsList defaultSettings [(SettingsEnablePush,0),(SettingsMaxHeaderListSize,200)]
-- Settings {headerTableSize = 4096, enablePush = False, maxConcurrentStreams = Just 64, initialWindowSize = 262144, maxFrameSize = 16384, maxHeaderListSize = Just 200, pingRateLimit = 10, emptyFrameRateLimit = 4, settingsRateLimit = 4, rstRateLimit = 4}
{- FOURMOLU_DISABLE -}
fromSettingsList :: Settings -> SettingsList -> Settings
fromSettingsList settings kvs = foldl' update settings kvs
where
update def (SettingsTokenHeaderTableSize,x) = def { headerTableSize = x }
-- fixme: x should be 0 or 1
update def (SettingsEnablePush,x) = def { enablePush = x > 0 }
update def (SettingsMaxConcurrentStreams,x) = def { maxConcurrentStreams = Just x }
update def (SettingsInitialWindowSize,x) = def { initialWindowSize = x }
update def (SettingsMaxFrameSize,x) = def { maxFrameSize = x }
update def (SettingsMaxHeaderListSize,x) = def { maxHeaderListSize = Just x }
update def _ = def
{- FOURMOLU_ENABLE -}
----------------------------------------------------------------
diff
:: Eq a
=> Settings
-> Settings
-> (Settings -> a)
-> SettingsKey
-> (a -> SettingsValue)
-> Maybe (SettingsKey, SettingsValue)
diff settings settings0 label key enc
| val == val0 = Nothing
| otherwise = Just (key, enc val)
where
val = label settings
val0 = label settings0
toSettingsList :: Settings -> Settings -> SettingsList
toSettingsList s s0 =
catMaybes
[ diff
s
s0
headerTableSize
SettingsTokenHeaderTableSize
id
, diff
s
s0
enablePush
SettingsEnablePush
(const 0) -- fixme
, diff
s
s0
maxConcurrentStreams
SettingsMaxConcurrentStreams
fromJust
, diff
s
s0
initialWindowSize
SettingsInitialWindowSize
id
, diff
s
s0
maxFrameSize
SettingsMaxFrameSize
id
, diff
s
s0
maxHeaderListSize
SettingsMaxHeaderListSize
fromJust
]
----------------------------------------------------------------
makeNegotiationFrames :: Settings -> WindowSize -> [ByteString]
makeNegotiationFrames settings connWindowSize = frame1 : frames
where
alist = toSettingsList settings baseSettings
frame1 = settingsFrame id alist
frames =
if connWindowSize /= defaultWindowSize
then [windowUpdateFrame 0 (connWindowSize - defaultWindowSize)]
else []
----------------------------------------------------------------
|
