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add udp relay support for http handler

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This commit is contained in:
ginuerzh
2021-12-01 21:23:19 +08:00
parent f3411832a8
commit 15f9aa091b
13 changed files with 386 additions and 250 deletions
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115
pkg/handler/socks/v5/udp.go
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@ -9,8 +9,9 @@ import (
"time"
"github.com/go-gost/gosocks5"
"github.com/go-gost/gost/pkg/common/bufpool"
"github.com/go-gost/gost/pkg/chain"
"github.com/go-gost/gost/pkg/common/util/socks"
"github.com/go-gost/gost/pkg/handler"
)
func (h *socks5Handler) handleUDP(ctx context.Context, conn net.Conn) {
@ -26,7 +27,7 @@ func (h *socks5Handler) handleUDP(ctx context.Context, conn net.Conn) {
return
}
relay, err := net.ListenUDP("udp", nil)
cc, err := net.ListenUDP("udp", nil)
if err != nil {
h.logger.Error(err)
reply := gosocks5.NewReply(gosocks5.Failure, nil)
@ -34,10 +35,10 @@ func (h *socks5Handler) handleUDP(ctx context.Context, conn net.Conn) {
h.logger.Debug(reply)
return
}
defer relay.Close()
defer cc.Close()
saddr := gosocks5.Addr{}
saddr.ParseFrom(relay.LocalAddr().String())
saddr.ParseFrom(cc.LocalAddr().String())
saddr.Type = 0
saddr.Host, _, _ = net.SplitHostPort(conn.LocalAddr().String()) // replace the IP to the out-going interface's
reply := gosocks5.NewReply(gosocks5.Succeeded, &saddr)
@ -48,99 +49,39 @@ func (h *socks5Handler) handleUDP(ctx context.Context, conn net.Conn) {
h.logger.Debug(reply)
h.logger = h.logger.WithFields(map[string]interface{}{
"bind": fmt.Sprintf("%s/%s", relay.LocalAddr(), relay.LocalAddr().Network()),
"bind": fmt.Sprintf("%s/%s", cc.LocalAddr(), cc.LocalAddr().Network()),
})
h.logger.Debugf("bind on %s OK", relay.LocalAddr())
h.logger.Debugf("bind on %s OK", cc.LocalAddr())
peer, err := net.ListenUDP("udp", nil)
// obtain a udp connection
r := (&chain.Router{}).
WithChain(h.chain).
WithRetry(h.md.retryCount).
WithLogger(h.logger)
c, err := r.Dial(ctx, "udp", "") // UDP association
if err != nil {
h.logger.Error(err)
return
}
defer peer.Close()
defer c.Close()
go h.relayUDP(
socks.UDPConn(relay, h.md.udpBufferSize),
peer,
)
pc, ok := c.(net.PacketConn)
if !ok {
h.logger.Errorf("wrong connection type")
return
}
relay := handler.NewUDPRelay(socks.UDPConn(cc, h.md.udpBufferSize), pc).
WithBypass(h.bypass).
WithLogger(h.logger)
relay.SetBufferSize(h.md.udpBufferSize)
go relay.Run()
t := time.Now()
h.logger.Infof("%s <-> %s", conn.RemoteAddr(), relay.LocalAddr())
h.logger.Infof("%s <-> %s", conn.RemoteAddr(), cc.LocalAddr())
io.Copy(ioutil.Discard, conn)
h.logger.
WithFields(map[string]interface{}{"duration": time.Since(t)}).
Infof("%s >-< %s", conn.RemoteAddr(), relay.LocalAddr())
}
func (h *socks5Handler) relayUDP(c, peer net.PacketConn) (err error) {
bufSize := h.md.udpBufferSize
errc := make(chan error, 2)
go func() {
for {
err := func() error {
b := bufpool.Get(bufSize)
defer bufpool.Put(b)
n, raddr, err := c.ReadFrom(b)
if err != nil {
return err
}
if h.bypass != nil && h.bypass.Contains(raddr.String()) {
h.logger.Warn("bypass: ", raddr)
return nil
}
if _, err := peer.WriteTo(b[:n], raddr); err != nil {
return err
}
h.logger.Debugf("%s >>> %s data: %d",
peer.LocalAddr(), raddr, n)
return nil
}()
if err != nil {
errc <- err
return
}
}
}()
go func() {
for {
err := func() error {
b := bufpool.Get(bufSize)
defer bufpool.Put(b)
n, raddr, err := peer.ReadFrom(b)
if err != nil {
return err
}
if h.bypass != nil && h.bypass.Contains(raddr.String()) {
h.logger.Warn("bypass: ", raddr)
return nil
}
if _, err := c.WriteTo(b[:n], raddr); err != nil {
return err
}
h.logger.Debugf("%s <<< %s data: %d",
peer.LocalAddr(), raddr, n)
return nil
}()
if err != nil {
errc <- err
return
}
}
}()
return <-errc
Infof("%s >-< %s", conn.RemoteAddr(), cc.LocalAddr())
}