save raw server config sent by the server

handshake/server_config_client.go

@@ -10,6 +10,7 @@ import (
 )
 
 type serverConfigClient struct {
+	raw    []byte
 	ID     []byte
 	obit   []byte
 	expiry time.Time
@@ -29,7 +30,7 @@ func parseServerConfig(data []byte) (*serverConfigClient, error) {
 		return nil, errMessageNotServerConfig
 	}
 
-	scfg := &serverConfigClient{}
+	scfg := &serverConfigClient{raw: data}
 	err = scfg.parseValues(tagMap)
 	if err != nil {
 		return nil, err
@@ -116,3 +117,7 @@ func (s *serverConfigClient) parseValues(tagMap map[Tag][]byte) error {
 
 	return nil
 }
+
+func (s *serverConfigClient) Get() []byte {
+	return s.raw
+}

handshake/server_config_client_test.go

@@ -22,6 +22,23 @@ var _ = Describe("Server Config", func() {
 		tagMap[TagEXPY] = bytes.Repeat([]byte{0}, 8)
 	})
 
+	It("returns the parsed server config", func() {
+		tagMap[TagSCID] = []byte{0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf}
+		b := &bytes.Buffer{}
+		WriteHandshakeMessage(b, TagSCFG, tagMap)
+		scfg, err := parseServerConfig(b.Bytes())
+		Expect(err).ToNot(HaveOccurred())
+		Expect(scfg.ID).To(Equal(tagMap[TagSCID]))
+	})
+
+	It("saves the raw server config", func() {
+		b := &bytes.Buffer{}
+		WriteHandshakeMessage(b, TagSCFG, tagMap)
+		scfg, err := parseServerConfig(b.Bytes())
+		Expect(err).ToNot(HaveOccurred())
+		Expect(scfg.raw).To(Equal(b.Bytes()))
+	})
+
 	Context("parsing the server config", func() {
 		It("rejects a handshake message with the wrong message tag", func() {
 			var serverConfig bytes.Buffer