cslarsen · April 27, 2014 07:14 · Apr 27, 2014
diff --git a/sendeth.py b/sendeth.py
@@ -0,0 +1,30 @@
+"""Demonstrates how to construct and send raw Ethernet packets on the
+network.
+
+You probably need root privs to be able to bind to the network interface,
+e.g.:
+
+    $ sudo python sendeth.py
+"""
+
+from socket import *
+
+def sendeth(src, dst, eth_type, payload, interface = "eth0"):
+  """Send raw Ethernet packet on interface."""
+
+  assert(len(src) == len(dst) == 6) # 48-bit ethernet addresses
+  assert(len(eth_type) == 2) # 16-bit ethernet type
+
+  s = socket(AF_PACKET, SOCK_RAW)
+
+  # From the docs: "For raw packet
+  # sockets the address is a tuple (ifname, proto [,pkttype [,hatype]])"
+  s.bind((interface, 0))
+  return s.send(src + dst + eth_type + payload)
+
+if __name__ == "__main__":
+  print("Sent %d-byte Ethernet packet on eth0" %
+    sendeth("\xFE\xED\xFA\xCE\xBE\xEF",
+            "\xFE\xED\xFA\xCE\xBE\xEF",
+            "\x7A\x05",
+            "hello"))