ginuerzh
23b58ddd23
Extract three pure-logic components from httpHandler to eliminate I/O
coupling from auth and sniffing construction, enabling synchronous unit
tests and reducing per-request allocation in sniffAndHandle:
- Authenticator struct with AuthResult return type — auth decisions no
longer write to the connection; callers handle response I/O. Auth
tests drop net.Pipe/goroutines for direct return-value assertions.
- SnifferBuilder pre-built in Init and reused per-connection via Build(),
replacing inline sniffing.Sniffer{} construction in sniffAndHandle.
- normalizeRequest extracted to util.go with NormalizedRequest type,
collapsing 20 lines of inline URL/normalisation into a single call.
- knockMatch extracted as standalone pure function.
- clampBodySize exported as ClampBodySize for cross-package use.
- util_test.go with 22 tests covering utility functions.
- helpers_test.go consolidates shared test fakes (logger, observer, conn).
113 lines
2.9 KiB
Go
113 lines
2.9 KiB
Go
package http
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import (
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"bytes"
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"context"
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"errors"
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"net"
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"net/http"
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"net/http/httputil"
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"time"
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"github.com/go-gost/core/logger"
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stats "github.com/go-gost/core/observer/stats"
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ictx "github.com/go-gost/x/internal/ctx"
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"github.com/go-gost/x/internal/net/udp"
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"github.com/go-gost/x/internal/util/socks"
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xrecorder "github.com/go-gost/x/recorder"
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)
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// handleUDP implements UDP over HTTP (UDP relay). When the client sets the
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// X-Gost-Protocol header to "udp", the handler responds with 200 OK and
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// establishes a UDP association through the proxy chain. Client data sent
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// over the HTTP connection is wrapped as SOCKS5 UDP packets and relayed
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// through the UDP tunnel.
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//
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// If UDP relay is disabled (enableUDP=false), a 403 Forbidden is returned.
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func (h *httpHandler) handleUDP(ctx context.Context, conn net.Conn, clientID string, ro *xrecorder.HandlerRecorderObject, log logger.Logger) error {
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log = log.WithFields(map[string]any{
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"cmd": "udp",
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})
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resp := &http.Response{
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ProtoMajor: 1,
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ProtoMinor: 1,
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Header: h.md.header,
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}
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if resp.Header == nil {
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resp.Header = http.Header{}
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}
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if !h.md.enableUDP {
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resp.StatusCode = http.StatusForbidden
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if log.IsLevelEnabled(logger.TraceLevel) {
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dump, _ := httputil.DumpResponse(resp, false)
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log.Trace(string(dump))
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}
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log.Error("http: UDP relay is disabled")
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return resp.Write(conn)
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}
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resp.StatusCode = http.StatusOK
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if log.IsLevelEnabled(logger.TraceLevel) {
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dump, _ := httputil.DumpResponse(resp, false)
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log.Trace(string(dump))
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}
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if err := resp.Write(conn); err != nil {
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log.Error(err)
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return err
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}
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if h.options.Observer != nil {
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pstats := h.stats.Stats(clientID)
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pstats.Add(stats.KindTotalConns, 1)
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pstats.Add(stats.KindCurrentConns, 1)
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defer pstats.Add(stats.KindCurrentConns, -1)
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}
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// Dial a UDP association through the proxy chain router. The empty
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// address signals that the router should create a UDP socket rather
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// than connect to a specific target.
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if h.options.Router == nil {
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return errors.New("nil router")
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}
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var buf bytes.Buffer
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c, err := h.options.Router.Dial(ictx.ContextWithBuffer(ctx, &buf), "udp", "")
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ro.Route = buf.String()
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if err != nil {
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log.Error(err)
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return err
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}
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defer c.Close()
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log.WithFields(map[string]any{"src": c.LocalAddr().String()})
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ro.SrcAddr = c.LocalAddr().String()
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pc, ok := c.(net.PacketConn)
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if !ok {
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err = errors.New("wrong connection type")
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log.Error(err)
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return err
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}
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// Wrap the HTTP connection as a SOCKS5 UDP tunnel server conn so
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// that the relay can read/write SOCKS5-encapsulated UDP datagrams.
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relay := udp.NewRelay(socks.UDPTunServerConn(conn), pc).
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WithService(h.options.Service).
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WithBypass(h.options.Bypass).
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WithBufferSize(h.md.udpBufferSize).
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WithLogger(log)
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t := time.Now()
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log.Infof("%s <-> %s", conn.RemoteAddr(), pc.LocalAddr())
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relay.Run(ctx)
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log.WithFields(map[string]any{
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"duration": time.Since(t),
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}).Infof("%s >-< %s", conn.RemoteAddr(), pc.LocalAddr())
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return nil
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}
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