137 lines
3 KiB
Go
137 lines
3 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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"strings"
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"time"
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adapters "github.com/Dreamacro/clash/adapters/inbound"
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C "github.com/Dreamacro/clash/constant"
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"github.com/Dreamacro/clash/common/pool"
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)
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func handleHTTP(request *adapters.HTTPAdapter, outbound net.Conn) {
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req := request.R
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host := req.Host
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inboundReader := bufio.NewReader(request)
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outboundReader := bufio.NewReader(outbound)
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for {
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keepAlive := strings.TrimSpace(strings.ToLower(req.Header.Get("Proxy-Connection"))) == "keep-alive"
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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(outbound)
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if err != nil {
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break
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}
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handleResponse:
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resp, err := http.ReadResponse(outboundReader, 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.StatusCode == http.StatusContinue {
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err = resp.Write(request)
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if err != nil {
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break
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}
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goto handleResponse
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}
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if keepAlive || 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)
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if err != nil || resp.Close {
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break
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}
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// even if resp.Write write body to the connection, but some http request have to Copy to close it
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buf := pool.Get(pool.RelayBufferSize)
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_, err = io.CopyBuffer(request, resp.Body, buf)
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pool.Put(buf)
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if err != nil && err != io.EOF {
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break
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}
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req, err = http.ReadRequest(inboundReader)
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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 handleUDPToRemote(packet C.UDPPacket, pc C.PacketConn, metadata *C.Metadata) {
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defer packet.Drop()
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if _, err := pc.WriteWithMetadata(packet.Data(), metadata); err != nil {
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return
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}
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}
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func handleUDPToLocal(packet C.UDPPacket, pc net.PacketConn, key string, fAddr net.Addr) {
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buf := pool.Get(pool.RelayBufferSize)
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defer pool.Put(buf)
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defer natTable.Delete(key)
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defer pc.Close()
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for {
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pc.SetReadDeadline(time.Now().Add(udpTimeout))
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n, from, err := pc.ReadFrom(buf)
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if err != nil {
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return
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}
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if fAddr != nil {
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from = fAddr
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}
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n, err = packet.WriteBack(buf[:n], from)
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if err != nil {
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return
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}
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}
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}
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func handleSocket(request *adapters.SocketAdapter, outbound net.Conn) {
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relay(request, outbound)
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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 := pool.Get(pool.RelayBufferSize)
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_, err := io.CopyBuffer(leftConn, rightConn, buf)
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pool.Put(buf)
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leftConn.SetReadDeadline(time.Now())
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ch <- err
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}()
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buf := pool.Get(pool.RelayBufferSize)
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io.CopyBuffer(rightConn, leftConn, buf)
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pool.Put(buf)
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rightConn.SetReadDeadline(time.Now())
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<-ch
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}
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