1 files changed, 87 insertions, 0 deletions
diff --git a/vpp/test/util.py b/vpp/test/util.py
new file mode 100644
index 00000000..0ac23760
--- /dev/null
+++ b/vpp/test/util.py
@@ -0,0 +1,87 @@
+import socket
+import sys
+from abc import abstractmethod, ABCMeta
+from cStringIO import StringIO
+
+
+def ppp(headline, packet):
+    """ Return string containing the output of scapy packet.show() call. """
+    o = StringIO()
+    old_stdout = sys.stdout
+    sys.stdout = o
+    print(headline)
+    packet.show()
+    sys.stdout = old_stdout
+    return o.getvalue()
+
+
+def ppc(headline, capture, limit=10):
+    """ Return string containing ppp() printout for a capture.
+
+    :param headline: printed as first line of output
+    :param capture: packets to print
+    :param limit: limit the print to # of packets
+    """
+    if not capture:
+        return headline
+    result = headline + "\n"
+    count = 1
+    for p in capture:
+        result.append(ppp("Packet #%s:" % count, p))
+        count += 1
+        if count >= limit:
+            break
+    if limit < len(capture):
+        result.append(
+            "Capture contains %s packets in total, of which %s were printed" %
+            (len(capture), limit))
+
+
+class NumericConstant(object):
+    __metaclass__ = ABCMeta
+
+    desc_dict = {}
+
+    @abstractmethod
+    def __init__(self, value):
+        self._value = value
+
+    def __int__(self):
+        return self._value
+
+    def __long__(self):
+        return self._value
+
+    def __str__(self):
+        if self._value in self.desc_dict:
+            return self.desc_dict[self._value]
+        return ""
+
+
+class Host(object):
+    """ Generic test host "connected" to VPPs interface. """
+
+    @property
+    def mac(self):
+        """ MAC address """
+        return self._mac
+
+    @property
+    def ip4(self):
+        """ IPv4 address """
+        return self._ip4
+
+    @property
+    def ip4n(self):
+        """ IPv4 address """
+        return socket.inet_pton(socket.AF_INET, self._ip4)
+
+    @property
+    def ip6(self):
+        """ IPv6 address """
+        return self._ip6
+
+    def __init__(self, mac=None, ip4=None, ip6=None):
+        self._mac = mac
+        self._ip4 = ip4
+        self._ip6 = ip6