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
+ tail = ""
+ if limit < len(capture):
+ tail = "\nPrint limit reached, %s out of %s packets printed" % (
+ len(capture), limit)
+ limit = len(capture)
+ body = "".join([ppp("Packet #%s:" % count, p)
+ for count, p in zip(range(0, limit), capture)])
+ return "%s\n%s%s" % (headline, body, tail)
+
+
+def ip4_range(ip4, s, e):
+ tmp = ip4.rsplit('.', 1)[0]
+ return ("%s.%d" % (tmp, i) for i in range(s, e))
+
+
+def ip4n_range(ip4n, s, e):
+ ip4 = socket.inet_ntop(socket.AF_INET, ip4n)
+ return (socket.inet_pton(socket.AF_INET, ip) for ip in ip4_range(ip4, s, e))
+
+
+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. """