97 lines
2.1 KiB
Go
97 lines
2.1 KiB
Go
package tunnel
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import (
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"errors"
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"io"
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"net"
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"time"
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N "github.com/Dreamacro/clash/common/net"
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"github.com/Dreamacro/clash/common/pool"
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"github.com/Dreamacro/clash/component/resolver"
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C "github.com/Dreamacro/clash/constant"
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)
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func handleUDPToRemote(packet C.UDPPacket, pc C.PacketConn, metadata *C.Metadata) error {
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defer packet.Drop()
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// local resolve UDP dns
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if !metadata.Resolved() {
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ip, err := resolver.ResolveIP(metadata.Host)
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if err != nil {
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return err
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}
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metadata.DstIP = ip
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}
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addr := metadata.UDPAddr()
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if addr == nil {
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return errors.New("udp addr invalid")
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}
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if _, err := pc.WriteTo(packet.Data(), addr); err != nil {
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return err
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}
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// reset timeout
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pc.SetReadDeadline(time.Now().Add(udpTimeout))
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return nil
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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.UDPBufferSize)
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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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_, 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(ctx C.ConnContext, outbound net.Conn) {
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relay(ctx.Conn(), 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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tcpKeepAlive(leftConn)
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tcpKeepAlive(rightConn)
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go func() {
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buf := pool.Get(pool.RelayBufferSize)
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// Wrapping to avoid using *net.TCPConn.(ReadFrom)
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// See also https://github.com/Dreamacro/clash/pull/1209
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_, err := io.CopyBuffer(N.WriteOnlyWriter{Writer: leftConn}, N.ReadOnlyReader{Reader: 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(N.WriteOnlyWriter{Writer: rightConn}, N.ReadOnlyReader{Reader: 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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func tcpKeepAlive(c net.Conn) {
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if tcp, ok := c.(*net.TCPConn); ok {
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tcp.SetKeepAlive(true)
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}
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}
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