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feat: update FET analyzer to better reflect what's described in the paper

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Toby 2024-02-26 15:27:35 -08:00
parent 420286a46c
commit 797dce3dc2
1 changed files with 5 additions and 2 deletions
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7
analyzer/tcp/fet.go
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@ -143,8 +143,11 @@ func isTLSorHTTP(bytes []byte) bool {
if len(bytes) < 3 {
return false
}
if bytes[0] == 0x16 && bytes[1] == 0x03 && bytes[2] <= 0x03 {
// TLS handshake for TLS 1.0-1.3
// "We observe that the GFW exempts any connection whose first
// three bytes match the following regular expression:
// [\x16-\x17]\x03[\x00-\x09]" - from the paper in Section 4.3
if bytes[0] >= 0x16 && bytes[0] <= 0x17 &&
bytes[1] == 0x03 && bytes[2] <= 0x09 {
return true
}
// HTTP request