dns_test: Added setup.sh which sets up env for dns test

Author: mnordsletten

test/net/integration/dns/setup.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+# Sets up the environment needed for running the DNS test
+OUTWARD_FACING_INTERFACE=ens3
+BRIDGE_INTERFACE=bridge43
+
+# Enable ip forwarding
+sudo sysctl -w net.ipv4.ip_forward=1
+
+# Create iptables rules for NATing all DNS requests
+
+# Masks the source address
+sudo iptables -t nat -A POSTROUTING -o $OUTWARD_FACING_INTERFACE -j MASQUERADE
+
+# Udp packets coming from bridge43 should be natted
+sudo iptables -t nat -A PREROUTING -i $BRIDGE_INTERFACE -p udp -m udp

test/net/integration/dns/test.py

@@ -2,6 +2,7 @@
 
 import sys
 import os
+import subprocess
 
 includeos_src = os.environ.get('INCLUDEOS_SRC',
                                os.path.realpath(os.path.join(os.getcwd(), os.path.dirname(__file__))).split('/test')[0])
@@ -10,6 +11,9 @@
 from vmrunner import vmrunner
 from vmrunner.prettify import color
 
+# Install build dependencies, ip forwarding
+subprocess.call(["bash", "setup.sh"])
+
 # Get an auto-created VM from the vmrunner
 vm = vmrunner.vms[0]
 

test/net/integration/dns/vm.json

@@ -1,5 +1,6 @@
 {
   "image" : "test_dns.img",
   "net" : [{"device" : "virtio", "mac" : "c0:01:0a:00:00:2a"}],
-  "mem"   : 128
+  "mem"   : 128,
+  "intrusive" : "True"
 }