chg: [server] unpack header

server/server.py

@@ -8,6 +8,8 @@ from twisted.python.modules import getModule
 
 from twisted.internet.protocol import Protocol
 
+from ctypes import *
+
 class Echo(Protocol):
 
     #def __init__(self, factory):
@@ -15,7 +17,32 @@ class Echo(Protocol):
 
     def dataReceived(self, data):
         print(data)
-        self.transport.write(data)
+        d = unpack(D4Header, data)
+        print('-----')
+        print(d.version)
+        print(d.type)
+        print('{}-{}'.format(d.uuid1, d.uuid2))
+        print(d.timestamp)
+        print('{}-{}-{}-{}'.format(d.hmac1, d.hmac2, d.hmac3, d.hmac4))
+        print(d.size)
+
+class D4Header(Structure):
+    _fields_ = [
+        ("version", c_uint8),
+        ("type", c_uint8),
+        ("uuid1", c_uint64),
+        ("uuid2", c_uint64),
+        ("timestamp", c_uint64),
+        ("hmac1", c_uint64),
+        ("hmac2", c_uint64),
+        ("hmac3", c_uint64),
+        ("hmac4", c_uint64),
+        ("size", c_uint32),
+        ]
+
+def unpack(ctype, buffer):
+    c_str = create_string_buffer(buffer)
+    return cast(pointer(c_str), POINTER(ctype)).contents
 
 def main(reactor):
     log.startLogging(sys.stdout)