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https://github.com/cmz0228/hysteria-dev.git
synced 2025-06-11 06:49:53 +00:00
f3f604b59a
fix: #306, #394, #185, #161 break changes: we won't create or maintain the interface now, so it is user's duty to create the tun interface, for example, with command like ip tuntap add dev hytun mode tun (or maybe we can use songgao/water to keep this behavior unchanged). correspondingly, the "address", "gateway", "mask", "dns", "persist" options in the "tun" config have been removed. in addition, please note xjasonlyu/tun2socks is licensed under GPLv3 and hysteria is licensed under MIT, I don't ensure is it legal to use it as a go mod, but there are too many requests related on it so whatever...
111 lines
2.1 KiB
Go
111 lines
2.1 KiB
Go
package tun
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import (
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"fmt"
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"github.com/tobyxdd/hysteria/pkg/core"
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"github.com/xjasonlyu/tun2socks/v2/core/adapter"
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"net"
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"strconv"
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"time"
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)
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const udpBufferSize = 65535
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func (s *Server) HandleUDP(conn adapter.UDPConn) {
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go s.handleUDPConn(conn)
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}
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func (s *Server) handleUDPConn(conn adapter.UDPConn) {
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defer conn.Close()
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id := conn.ID()
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remoteAddr := net.UDPAddr{
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IP: net.IP(id.LocalAddress),
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Port: int(id.LocalPort),
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}
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localAddr := net.UDPAddr{
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IP: net.IP(id.RemoteAddress),
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Port: int(id.RemotePort),
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}
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if s.RequestFunc != nil {
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s.RequestFunc(&localAddr, remoteAddr.String())
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}
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var err error
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defer func() {
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if s.ErrorFunc != nil && err != nil {
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s.ErrorFunc(&localAddr, remoteAddr.String(), err)
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}
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}()
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rc, err := s.HyClient.DialUDP()
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if err != nil {
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return
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}
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defer rc.Close()
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err = s.relayUDP(conn, rc, &remoteAddr, s.Timeout)
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}
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func (s *Server) relayUDP(lc adapter.UDPConn, rc core.UDPConn, to *net.UDPAddr, timeout time.Duration) (err error) {
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errChan := make(chan error, 2)
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// local => remote
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go func() {
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buf := make([]byte, udpBufferSize)
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for {
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if timeout != 0 {
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_ = lc.SetDeadline(time.Now().Add(timeout))
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n, err := lc.Read(buf)
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if n > 0 {
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err = rc.WriteTo(buf[:n], to.String())
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if err != nil {
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errChan <- err
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return
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}
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}
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if err != nil {
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errChan <- err
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return
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}
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}
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}
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}()
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// remote => local
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go func() {
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for {
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pkt, addr, err := rc.ReadFrom()
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if err != nil {
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errChan <- err
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return
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}
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if pkt != nil {
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host, portStr, err := net.SplitHostPort(addr)
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if err != nil {
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errChan <- err
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return
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}
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port, err := strconv.Atoi(portStr)
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if err != nil {
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errChan <- fmt.Errorf("cannot parse as port: %s", portStr)
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return
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}
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// adapter.UDPConn doesn't support WriteFrom() yet,
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// so we check the src address and behavior like a symmetric NAT
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if !to.IP.Equal(net.ParseIP(host)) || to.Port != port {
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// drop the packet silently
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continue
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}
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_, err = lc.Write(pkt)
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if err != nil {
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errChan <- err
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return
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}
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}
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}
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}()
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return <-errChan
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}
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