/
random_head.go
71 lines (57 loc) · 1.35 KB
/
random_head.go
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package obfs
import (
crand "crypto/rand"
"math/rand/v2"
"net"
ssr "github.com/Asutorufa/yuhaiin/pkg/net/proxy/shadowsocksr/utils"
"github.com/Asutorufa/yuhaiin/pkg/utils/pool"
)
type randomHead struct {
rawTransSent bool
rawTransReceived bool
hasSentHeader bool
dataBuffer []byte
net.Conn
}
func newRandomHead(conn net.Conn, _ Obfs) net.Conn { return &randomHead{Conn: conn} }
func (r *randomHead) encode(data []byte) (encodedData []byte) {
if r.rawTransSent {
return data
}
if r.hasSentHeader {
if len(data) > 0 {
r.dataBuffer = append(r.dataBuffer, data...)
} else {
encodedData = r.dataBuffer
r.dataBuffer = nil
r.rawTransSent = true
}
return
}
size := rand.IntN(96) + 8
encodedData = make([]byte, size)
_, _ = crand.Read(encodedData)
ssr.SetCRC32(encodedData, size)
r.dataBuffer = append(r.dataBuffer, data...)
r.hasSentHeader = true
return
}
func (r *randomHead) Write(b []byte) (int, error) {
if r.rawTransSent {
return r.Conn.Write(b)
}
_, err := r.Conn.Write(r.encode(b))
return len(b), err
}
func (r *randomHead) Read(b []byte) (n int, err error) {
if r.rawTransReceived {
return r.Conn.Read(b)
}
buf := pool.GetBytes(pool.DefaultSize)
defer pool.PutBytes(buf)
r.Conn.Read(buf)
r.rawTransReceived = true
r.Conn.Write(nil)
return 0, nil
}
func (r *randomHead) GetOverhead() int { return 0 }