Add a test for EtherEncap module.

Author: justinemarie

bessctl/conf/testing/module_tests/etherencap.py

@@ -0,0 +1,54 @@
+## Can't run Crash or Output tests because EtherEncap requires metadata to be set first #
+
+def etherencap_crashtest():
+    encap1 = EtherEncap()
+    src = Source()
+    metadata = SetMetadata(attrs=[{"name": "ether_src", "size": 6, "value_bin": "deadbeef1234".decode("hex")},
+        {"name": "ether_dst", "size": 6, "value_bin": "1234deadbeef".decode("hex")},
+        {"name" : "ether_type", "size": 2, "value_bin": "0800".decode("hex")}])
+    rwtemp = [
+        bytes(gen_packet(
+            scapy.UDP,
+            "172.12.0.3",
+            "127.12.0.4")),
+        bytes(gen_packet(
+            scapy.TCP,
+            "192.168.32.4",
+            "1.2.3.4"))]
+    src -> Rewrite(templates=rwtemp) -> metadata -> encap1 -> Sink()
+    bess.resume_all()
+    time.sleep(15)
+    bess.pause_all()
+
+
+CUSTOM_TEST_FUNCTIONS.append(etherencap_crashtest)
+
+## See if it correctly wraps IP packet in Ether header
+def metadata_outputtest_fixedvalues():
+    eth = scapy.Ether(src='de:ad:be:ef:12:34', dst='12:34:de:ad:be:ef')
+    ip = scapy.IP(src="1.2.3.4", dst="2.3.4.5", ttl=98)
+    udp = scapy.UDP(sport=10001, dport=10002)
+    payload = 'helloworld'
+
+    test_packet_in = ip/udp/payload
+    test_packet_out = eth/ip/udp/payload
+
+    sockname = "metadata_fixedvalues" + SCRIPT_STARTTIME
+    socket_port, mysocket = gen_socket_and_port(sockname)
+
+    indriver = PortInc(port=sockname)
+    outdriver = PortOut(port=sockname)
+
+    encap2 = EtherEncap()
+    metadata = SetMetadata(attrs=[{"name": "ether_src", "size": 6, "value_bin": "deadbeef1234".decode("hex")},
+        {"name": "ether_dst", "size": 6, "value_bin": "1234deadbeef".decode("hex")},
+        {"name" : "ether_type", "size": 2, "value_bin": "0800".decode("hex")}])
+    indriver -> metadata -> encap2 -> outdriver
+
+    bess.resume_all()
+    mysocket.send(bytes(test_packet_in))
+    return_data = mysocket.recv(2048)
+    bess.pause_all()
+    assert(str(return_data) == str(test_packet_out))
+
+CUSTOM_TEST_FUNCTIONS.append(metadata_outputtest_fixedvalues)