1 files changed, 26 insertions, 0 deletions
diff --git a/external/construct/protocols/layer4/udp.py b/external/construct/protocols/layer4/udp.py
new file mode 100644
index 0000000..42a951e
--- /dev/null
+++ b/external/construct/protocols/layer4/udp.py
@@ -0,0 +1,26 @@
+"""
+User Datagram Protocol (TCP/IP protocol stack)
+"""
+from construct import *
+import six
+from binascii import unhexlify
+
+
+udp_header = Struct("udp_header",
+    Value("header_length", lambda ctx: 8),
+    UBInt16("source"),
+    UBInt16("destination"),
+    ExprAdapter(UBInt16("payload_length"), 
+        encoder = lambda obj, ctx: obj + 8,
+        decoder = lambda obj, ctx: obj - 8,
+    ),
+    UBInt16("checksum"),
+)
+
+if __name__ == "__main__":
+    cap = unhexlify(six.b("0bcc003500280689"))
+    obj = udp_header.parse(cap)
+    print (obj)
+    print (repr(udp_header.build(obj)))
+
+