sing-box/transport/v2raygrpclite/server.go

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package v2raygrpclite
import (
"context"
"net"
"net/http"
"os"
"strings"
"time"
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"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"
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aTLS "github.com/sagernet/sing/common/tls"
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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 {
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tlsConfig tls.ServerConfig
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{
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tlsConfig: tlsConfig,
handler: handler,
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path: "/" + options.ServiceName + "/Tun",
h2Server: &http2.Server{
IdleTimeout: time.Duration(options.IdleTimeout),
},
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}
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server.httpServer = &http.Server{
Handler: server,
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BaseContext: func(net.Listener) context.Context {
return ctx
},
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}
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server.h2cHandler = h2c.NewHandler(server, server.h2Server)
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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
}
if statusCode > 0 {
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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if s.tlsConfig != nil {
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if !common.Contains(s.tlsConfig.NextProtos(), http2.NextProtoTLS) {
s.tlsConfig.SetNextProtos(append([]string{"h2"}, s.tlsConfig.NextProtos()...))
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}
listener = aTLS.NewListener(listener, s.tlsConfig)
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}
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return s.httpServer.Serve(listener)
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}
func (s *Server) ServePacket(listener net.PacketConn) error {
return os.ErrInvalid
}
func (s *Server) Close() error {
return common.Close(common.PtrOrNil(s.httpServer))
}