Add initial code

cmd/relaysrv/protocol/packets.go

@@ -0,0 +1,45 @@
+// Copyright (C) 2015 Audrius Butkevicius and Contributors (see the CONTRIBUTORS file).
+
+//go:generate -command genxdr go run ../../syncthing/Godeps/_workspace/src/github.com/calmh/xdr/cmd/genxdr/main.go
+//go:generate genxdr -o packets_xdr.go packets.go
+
+package protocol
+
+import (
+	"unsafe"
+)
+
+const (
+	Magic        = 0x9E79BC40
+	HeaderSize   = unsafe.Sizeof(&Header{})
+	ProtocolName = "bep-relay"
+)
+
+const (
+	MessageTypePing int32 = iota
+	MessageTypePong
+	MessageTypeJoinRequest
+	MessageTypeConnectRequest
+	MessageTypeSessionInvitation
+)
+
+type Header struct {
+	Magic         uint32
+	MessageType   int32
+	MessageLength int32
+}
+
+type Ping struct{}
+type Pong struct{}
+type JoinRequest struct{}
+
+type ConnectRequest struct {
+	ID []byte // max:32
+}
+
+type SessionInvitation struct {
+	Key          []byte // max:32
+	Address      []byte // max:32
+	Port         uint16
+	ServerSocket bool
+}