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Eliminate blocking reads in the HTTP2 matcher.

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The HTTP2 matcher uses io.ReadFull to read the client preface.
If the client sends a string shorter than the preface (e.g.,
SSL version) io.ReadFull will block.

Replace io.ReadFull with Read and assume partial reads will not
match

Fixes #44
This commit is contained in:
Soheil Hassas Yeganeh 2017-04-22 23:58:46 -04:00
parent b6ec57c1a4
commit c0f3570a02
1 changed files with 16 additions and 4 deletions
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20
matchers.go
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@ -123,11 +123,23 @@ func HTTP2MatchHeaderFieldSendSettings(name, value string) MatchWriter {
func hasHTTP2Preface(r io.Reader) bool {
var b [len(http2.ClientPreface)]byte
if _, err := io.ReadFull(r, b[:]); err != nil {
return false
}
last := 0
return string(b[:]) == http2.ClientPreface
for {
n, err := r.Read(b[last:])
if err != nil {
return false
}
last += n
eq := string(b[:last]) == http2.ClientPreface[:last]
if last == len(http2.ClientPreface) {
return eq
}
if !eq {
return false
}
}
}
func matchHTTP1Field(r io.Reader, name, value string) (matched bool) {