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
|
package http2interop
import (
"fmt"
"time"
)
// Section 6.5 says the minimum SETTINGS_MAX_FRAME_SIZE is 16,384
func testSmallMaxFrameSize(ctx *HTTP2InteropCtx) error {
conn, err := connect(ctx)
if err != nil {
return err
}
defer conn.Close()
conn.SetDeadline(time.Now().Add(defaultTimeout))
sf := &SettingsFrame{
Params: []SettingsParameter{{
Identifier: SettingsMaxFrameSize,
Value: 1<<14 - 1, // 1 less than the smallest maximum
}},
}
if err := http2Connect(conn, sf); err != nil {
return err
}
if _, err := expectGoAwaySoon(conn); err != nil {
return err
}
return nil
}
// Section 6.5.3 says all settings frames must be acked.
func testAllSettingsFramesAcked(ctx *HTTP2InteropCtx) error {
conn, err := connect(ctx)
if err != nil {
return err
}
defer conn.Close()
conn.SetDeadline(time.Now().Add(defaultTimeout))
sf := &SettingsFrame{}
if err := http2Connect(conn, sf); err != nil {
return err
}
// The spec says "The values in the SETTINGS frame MUST be processed in the order they
// appear. [...] Once all values have been processed, the recipient MUST immediately
// emit a SETTINGS frame with the ACK flag set." From my understanding, processing all
// of no values warrants an ack per frame.
for i := 0; i < 10; i++ {
if err := streamFrame(conn, sf); err != nil {
return err
}
}
var settingsFramesReceived = 0
// The server by default sends a settings frame as part of the handshake, and another
// after the receipt of the initial settings frame as part of our conneection preface.
// This means we expected 1 + 1 + 10 = 12 settings frames in return, with all but the
// first having the ack bit.
for settingsFramesReceived < 12 {
f, err := parseFrame(conn)
if err != nil {
return err
}
// Other frames come down the wire too, including window update. Just ignore those.
if f, ok := f.(*SettingsFrame); ok {
settingsFramesReceived += 1
if settingsFramesReceived == 1 {
if f.Header.Flags&SETTINGS_FLAG_ACK > 0 {
return fmt.Errorf("settings frame should not have used ack: %v")
}
continue
}
if f.Header.Flags&SETTINGS_FLAG_ACK == 0 {
return fmt.Errorf("settings frame should have used ack: %v", f)
}
if len(f.Params) != 0 {
return fmt.Errorf("settings ack cannot have params: %v", f)
}
}
}
return nil
}
|
