sing-box/transport/v2raygrpclite/server.go

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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"
"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 N.TCPConnectionHandler
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 N.TCPConnectionHandler, errorHandler E.Handler) (*Server, error) {
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server := &Server{
handler: handler,
errorHandler: errorHandler,
path: fmt.Sprintf("/%s/Tun", url.QueryEscape(options.ServiceName)),
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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 !common.Contains(stdConfig.NextProtos, "h2") {
stdConfig.NextProtos = append(stdConfig.NextProtos, "h2")
}
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 {
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request.Write(os.Stdout)
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writer.WriteHeader(http.StatusNotFound)
s.badRequest(request, E.New("bad path: ", request.URL.Path))
return
}
if request.Method != http.MethodPost {
writer.WriteHeader(http.StatusNotFound)
s.badRequest(request, E.New("bad method: ", request.Method))
return
}
if ct := request.Header.Get("Content-Type"); !strings.HasPrefix(ct, "application/grpc") {
writer.WriteHeader(http.StatusNotFound)
s.badRequest(request, E.New("bad content type: ", ct))
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)
conn := newGunConn(request.Body, writer, writer.(http.Flusher))
s.handler.NewConnection(request.Context(), conn, metadata)
}
func (s *Server) badRequest(request *http.Request, err error) {
s.errorHandler.NewError(request.Context(), E.Cause(err, "process connection from ", request.RemoteAddr))
}
func (s *Server) Serve(listener net.Listener) error {
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err := http2.ConfigureServer(s.httpServer, s.h2Server)
if err != nil {
return err
}
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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))
}