91 lines
2.1 KiB
Go
91 lines
2.1 KiB
Go
package tunnel
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import (
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"bufio"
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"io"
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"net"
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"net/http"
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"sync"
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"time"
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"github.com/Dreamacro/clash/adapters/inbound"
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C "github.com/Dreamacro/clash/constant"
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)
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const (
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// io.Copy default buffer size is 32 KiB
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// but the maximum packet size of vmess/shadowsocks is about 16 KiB
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// so define a buffer of 20 KiB to reduce the memory of each TCP relay
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bufferSize = 20 * 1024
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)
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var bufPool = sync.Pool{New: func() interface{} { return make([]byte, bufferSize) }}
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func (t *Tunnel) handleHTTP(request *adapters.HTTPAdapter, proxy C.ProxyAdapter) {
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conn := newTrafficTrack(proxy.Conn(), t.traffic)
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req := request.R
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host := req.Host
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for {
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req.Header.Set("Connection", "close")
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req.RequestURI = ""
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adapters.RemoveHopByHopHeaders(req.Header)
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err := req.Write(conn)
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if err != nil {
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break
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}
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br := bufio.NewReader(conn)
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resp, err := http.ReadResponse(br, req)
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if err != nil {
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break
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}
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adapters.RemoveHopByHopHeaders(resp.Header)
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if resp.ContentLength >= 0 {
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resp.Header.Set("Proxy-Connection", "keep-alive")
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resp.Header.Set("Connection", "keep-alive")
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resp.Header.Set("Keep-Alive", "timeout=4")
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resp.Close = false
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} else {
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resp.Close = true
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}
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err = resp.Write(request.Conn())
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if err != nil || resp.Close {
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break
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}
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req, err = http.ReadRequest(bufio.NewReader(request.Conn()))
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if err != nil {
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break
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}
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// Sometimes firefox just open a socket to process multiple domains in HTTP
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// The temporary solution is close connection when encountering different HOST
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if req.Host != host {
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break
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}
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}
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}
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func (t *Tunnel) handleSOCKS(request *adapters.SocketAdapter, proxy C.ProxyAdapter) {
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conn := newTrafficTrack(proxy.Conn(), t.traffic)
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relay(request.Conn(), conn)
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}
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// relay copies between left and right bidirectionally.
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func relay(leftConn, rightConn net.Conn) {
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ch := make(chan error)
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go func() {
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buf := bufPool.Get().([]byte)
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_, err := io.CopyBuffer(leftConn, rightConn, buf)
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bufPool.Put(buf[:cap(buf)])
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leftConn.SetReadDeadline(time.Now())
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ch <- err
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}()
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buf := bufPool.Get().([]byte)
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io.CopyBuffer(rightConn, leftConn, buf)
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bufPool.Put(buf[:cap(buf)])
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rightConn.SetReadDeadline(time.Now())
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<-ch
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}
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