Add domain sniffer

common/sniff/tls.go

@@ -0,0 +1,28 @@
+package sniff
+
+import (
+	"context"
+	"crypto/tls"
+	"io"
+
+	"github.com/sagernet/sing-box/adapter"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing/common/bufio"
+)
+
+func TLSClientHello(ctx context.Context, reader io.Reader) (*adapter.InboundContext, error) {
+	var clientHello *tls.ClientHelloInfo
+	err := tls.Server(bufio.NewReadOnlyConn(reader), &tls.Config{
+		GetConfigForClient: func(argHello *tls.ClientHelloInfo) (*tls.Config, error) {
+			clientHello = argHello
+			return nil, nil
+		},
+	}).HandshakeContext(ctx)
+	if clientHello != nil {
+		return &adapter.InboundContext{Protocol: C.ProtocolTLS, Domain: clientHello.ServerName}, nil
+	}
+	return nil, err
+}
+
+func Packet() {
+}