sing-box/transport/v2raygrpclite/server.go

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//go:build !go1.20
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package v2raygrpclite
import (
"context"
"fmt"
"net"
"net/http"
"net/url"
"os"
"strings"
"github.com/sagernet/sing-box/adapter"
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"github.com/sagernet/sing-box/common/tls"
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"github.com/sagernet/sing-box/option"
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"github.com/sagernet/sing-box/transport/v2rayhttp"
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"github.com/sagernet/sing/common"
E "github.com/sagernet/sing/common/exceptions"
M "github.com/sagernet/sing/common/metadata"
N "github.com/sagernet/sing/common/network"
sHttp "github.com/sagernet/sing/protocol/http"
"golang.org/x/net/http2"
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"golang.org/x/net/http2/h2c"
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)
var _ adapter.V2RayServerTransport = (*Server)(nil)
type Server struct {
handler adapter.V2RayServerTransportHandler
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errorHandler E.Handler
httpServer *http.Server
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h2Server *http2.Server
h2cHandler http.Handler
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path string
}
func (s *Server) Network() []string {
return []string{N.NetworkTCP}
}
func NewServer(ctx context.Context, options option.V2RayGRPCOptions, tlsConfig tls.ServerConfig, handler adapter.V2RayServerTransportHandler) (*Server, error) {
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server := &Server{
handler: handler,
path: fmt.Sprintf("/%s/Tun", url.QueryEscape(options.ServiceName)),
h2Server: new(http2.Server),
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}
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server.httpServer = &http.Server{
Handler: server,
}
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server.h2cHandler = h2c.NewHandler(server, server.h2Server)
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if tlsConfig != nil {
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stdConfig, err := tlsConfig.Config()
if err != nil {
return nil, err
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}
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if len(stdConfig.NextProtos) == 0 {
stdConfig.NextProtos = []string{http2.NextProtoTLS}
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}
server.httpServer.TLSConfig = stdConfig
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}
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return server, nil
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}
func (s *Server) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
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if request.Method == "PRI" && len(request.Header) == 0 && request.URL.Path == "*" && request.Proto == "HTTP/2.0" {
s.h2cHandler.ServeHTTP(writer, request)
return
}
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if request.URL.Path != s.path {
s.fallbackRequest(request.Context(), writer, request, http.StatusNotFound, E.New("bad path: ", request.URL.Path))
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return
}
if request.Method != http.MethodPost {
s.fallbackRequest(request.Context(), writer, request, http.StatusNotFound, E.New("bad method: ", request.Method))
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return
}
if ct := request.Header.Get("Content-Type"); !strings.HasPrefix(ct, "application/grpc") {
s.fallbackRequest(request.Context(), writer, request, http.StatusNotFound, E.New("bad content type: ", ct))
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return
}
writer.Header().Set("Content-Type", "application/grpc")
writer.Header().Set("TE", "trailers")
writer.WriteHeader(http.StatusOK)
var metadata M.Metadata
metadata.Source = sHttp.SourceAddress(request)
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conn := v2rayhttp.NewHTTP2Wrapper(newGunConn(request.Body, writer, writer.(http.Flusher)))
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s.handler.NewConnection(request.Context(), conn, metadata)
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conn.CloseWrapper()
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}
func (s *Server) fallbackRequest(ctx context.Context, writer http.ResponseWriter, request *http.Request, statusCode int, err error) {
conn := v2rayhttp.NewHTTPConn(request.Body, writer)
fErr := s.handler.FallbackConnection(ctx, &conn, M.Metadata{})
if fErr == nil {
return
} else if fErr == os.ErrInvalid {
fErr = nil
}
writer.WriteHeader(statusCode)
s.handler.NewError(request.Context(), E.Cause(E.Errors(err, E.Cause(fErr, "fallback connection")), "process connection from ", request.RemoteAddr))
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}
func (s *Server) Serve(listener net.Listener) error {
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fixTLSConfig := s.httpServer.TLSConfig == nil
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err := http2.ConfigureServer(s.httpServer, s.h2Server)
if err != nil {
return err
}
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if fixTLSConfig {
s.httpServer.TLSConfig = nil
}
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if s.httpServer.TLSConfig == nil {
return s.httpServer.Serve(listener)
} else {
return s.httpServer.ServeTLS(listener, "", "")
}
}
func (s *Server) ServePacket(listener net.PacketConn) error {
return os.ErrInvalid
}
func (s *Server) Close() error {
return common.Close(common.PtrOrNil(s.httpServer))
}