mirror of https://github.com/Dreamacro/clash.git
91 lines
2.0 KiB
Go
91 lines
2.0 KiB
Go
package obfs
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/base64"
|
|
"fmt"
|
|
"io"
|
|
"math/rand"
|
|
"net"
|
|
"net/http"
|
|
|
|
"github.com/Dreamacro/clash/common/pool"
|
|
)
|
|
|
|
// HTTPObfs is shadowsocks http simple-obfs implementation
|
|
type HTTPObfs struct {
|
|
net.Conn
|
|
host string
|
|
port string
|
|
buf []byte
|
|
offset int
|
|
firstRequest bool
|
|
firstResponse bool
|
|
}
|
|
|
|
func (ho *HTTPObfs) Read(b []byte) (int, error) {
|
|
if ho.buf != nil {
|
|
n := copy(b, ho.buf[ho.offset:])
|
|
ho.offset += n
|
|
if ho.offset == len(ho.buf) {
|
|
ho.buf = nil
|
|
}
|
|
return n, nil
|
|
}
|
|
|
|
if ho.firstResponse {
|
|
buf := pool.BufPool.Get().([]byte)
|
|
n, err := ho.Conn.Read(buf)
|
|
if err != nil {
|
|
pool.BufPool.Put(buf[:cap(buf)])
|
|
return 0, err
|
|
}
|
|
idx := bytes.Index(buf[:n], []byte("\r\n\r\n"))
|
|
if idx == -1 {
|
|
pool.BufPool.Put(buf[:cap(buf)])
|
|
return 0, io.EOF
|
|
}
|
|
ho.firstResponse = false
|
|
length := n - (idx + 4)
|
|
n = copy(b, buf[idx+4:n])
|
|
if length > n {
|
|
ho.buf = buf[:idx+4+length]
|
|
ho.offset = idx + 4 + n
|
|
} else {
|
|
pool.BufPool.Put(buf[:cap(buf)])
|
|
}
|
|
return n, nil
|
|
}
|
|
return ho.Conn.Read(b)
|
|
}
|
|
|
|
func (ho *HTTPObfs) Write(b []byte) (int, error) {
|
|
if ho.firstRequest {
|
|
randBytes := make([]byte, 16)
|
|
rand.Read(randBytes)
|
|
req, _ := http.NewRequest("GET", fmt.Sprintf("http://%s/", ho.host), bytes.NewBuffer(b[:]))
|
|
req.Header.Set("User-Agent", fmt.Sprintf("curl/7.%d.%d", rand.Int()%54, rand.Int()%2))
|
|
req.Header.Set("Upgrade", "websocket")
|
|
req.Header.Set("Connection", "Upgrade")
|
|
req.Host = fmt.Sprintf("%s:%s", ho.host, ho.port)
|
|
req.Header.Set("Sec-WebSocket-Key", base64.URLEncoding.EncodeToString(randBytes))
|
|
req.ContentLength = int64(len(b))
|
|
err := req.Write(ho.Conn)
|
|
ho.firstRequest = false
|
|
return len(b), err
|
|
}
|
|
|
|
return ho.Conn.Write(b)
|
|
}
|
|
|
|
// NewHTTPObfs return a HTTPObfs
|
|
func NewHTTPObfs(conn net.Conn, host string, port string) net.Conn {
|
|
return &HTTPObfs{
|
|
Conn: conn,
|
|
firstRequest: true,
|
|
firstResponse: true,
|
|
host: host,
|
|
port: port,
|
|
}
|
|
}
|