Add Honeycomb interface management tests (ipv4, ipv6, ethernet, routing)

[csit.git] / resources / libraries / python / PacketVerifier.py

diff --git a/resources/libraries/python/PacketVerifier.py b/resources/libraries/python/PacketVerifier.py
index 566ea95..78c3670 100644 (file)
--- a/resources/libraries/python/PacketVerifier.py
+++ b/resources/libraries/python/PacketVerifier.py
@@ -63,20 +63,20 @@
 """
 
 
 """
 
 

+import os

 import socket
 import select
 import socket
 import select

-import os
-import time
-from multiprocessing import Queue, Process
+

 from scapy.all import ETH_P_IP, ETH_P_IPV6, ETH_P_ALL, ETH_P_ARP
 from scapy.all import Ether, ARP, Packet
 from scapy.layers.inet6 import IPv6
 
 __all__ = ['RxQueue', 'TxQueue', 'Interface', 'create_gratuitous_arp_request',
 from scapy.all import ETH_P_IP, ETH_P_IPV6, ETH_P_ALL, ETH_P_ARP
 from scapy.all import Ether, ARP, Packet
 from scapy.layers.inet6 import IPv6
 
 __all__ = ['RxQueue', 'TxQueue', 'Interface', 'create_gratuitous_arp_request',

-           'auto_pad']
+           'auto_pad', 'checksum_equal']

 
 # TODO: http://stackoverflow.com/questions/320232/ensuring-subprocesses-are-dead-on-exiting-python-program
 
 
 # TODO: http://stackoverflow.com/questions/320232/ensuring-subprocesses-are-dead-on-exiting-python-program
 

+

 class PacketVerifier(object):
     """Base class for TX and RX queue objects for packet verifier."""
     def __init__(self, interface_name):
 class PacketVerifier(object):
     """Base class for TX and RX queue objects for packet verifier."""
     def __init__(self, interface_name):


@@ -95,10 +95,10 @@ def extract_one_packet(buf):
     Takes string as input and looks for first whole packet in it.
     If it finds one, it returns substring from the buf parameter.
 
     Takes string as input and looks for first whole packet in it.
     If it finds one, it returns substring from the buf parameter.
 

-    :param buf: string representation of incoming packet buffer.
-    :type buf: string
+    :param buf: String representation of incoming packet buffer.
+    :type buf: str

     :return: String representation of first packet in buf.
     :return: String representation of first packet in buf.

-    :rtype: string
+    :rtype: str

     """
     pkt_len = 0
 
     """
     pkt_len = 0
 


@@ -178,9 +178,9 @@ def packet_reader(interface_name, queue):
     This function is meant to be run in separate subprocess and is in tight
     loop reading raw packets from interface passed as parameter.
 
     This function is meant to be run in separate subprocess and is in tight
     loop reading raw packets from interface passed as parameter.
 

-    :param interace_name: Name of interface to read packets from.
+    :param interface_name: Name of interface to read packets from.

     :param queue: Queue in which this function will push incoming packets.
     :param queue: Queue in which this function will push incoming packets.

-    :type interface_name: string
+    :type interface_name: str

     :type queue: multiprocessing.Queue
     :return: None
     """
     :type queue: multiprocessing.Queue
     :return: None
     """


@@ -199,19 +199,11 @@ class RxQueue(PacketVerifier):
     function to access them.
 
     :param interface_name: Which interface to bind to.
     function to access them.
 
     :param interface_name: Which interface to bind to.

-    :type interface_name: string
+    :type interface_name: str

     """
     """

-

     def __init__(self, interface_name):
         PacketVerifier.__init__(self, interface_name)
 
     def __init__(self, interface_name):
         PacketVerifier.__init__(self, interface_name)
 

-        #self._queue = Queue()
-        #self._proc = Process(target=packet_reader, args=(interface_name,
-        #                                                 self._queue))
-        #self._proc.daemon = True
-        #self._proc.start()
-        #time.sleep(2)
-

     def recv(self, timeout=3, ignore=None):
         """Read next received packet.
 
     def recv(self, timeout=3, ignore=None):
         """Read next received packet.
 


@@ -220,18 +212,19 @@ class RxQueue(PacketVerifier):
         arrives in given timeout queue.Empty exception will be risen.
 
         :param timeout: How many seconds to wait for next packet.
         arrives in given timeout queue.Empty exception will be risen.
 
         :param timeout: How many seconds to wait for next packet.

+        :param ignore: Packet list that should be ignored.

         :type timeout: int
         :type timeout: int

+        :type ignore: list

 
         :return: Ether() initialized object from packet data.
         :rtype: scapy.Ether
         """
 
         :return: Ether() initialized object from packet data.
         :rtype: scapy.Ether
         """

-
-        #pkt = self._queue.get(True, timeout=timeout)

         (rlist, _, _) = select.select([self._sock], [], [], timeout)
         if self._sock not in rlist:
             return None
 
         pkt = self._sock.recv(0x7fff)
         (rlist, _, _) = select.select([self._sock], [], [], timeout)
         if self._sock not in rlist:
             return None
 
         pkt = self._sock.recv(0x7fff)

+        pkt_pad = auto_pad(pkt)

         print 'Received packet on {0} of len {1}'.format(self._ifname, len(pkt))
         Ether(pkt).show2()
         print
         print 'Received packet on {0} of len {1}'.format(self._ifname, len(pkt))
         Ether(pkt).show2()
         print


@@ -241,7 +234,7 @@ class RxQueue(PacketVerifier):
                 # Auto pad all packets in ignore list
                 ignore[i] = auto_pad(ig_pkt)
             for ig_pkt in ignore:
                 # Auto pad all packets in ignore list
                 ignore[i] = auto_pad(ig_pkt)
             for ig_pkt in ignore:

-                if ig_pkt == pkt:
+                if ig_pkt == pkt_pad:

                     # Found the packet in ignore list, get another one
                     # TODO: subtract timeout - time_spent in here
                     ignore.remove(ig_pkt)
                     # Found the packet in ignore list, get another one
                     # TODO: subtract timeout - time_spent in here
                     ignore.remove(ig_pkt)


@@ -256,7 +249,7 @@ class TxQueue(PacketVerifier):
     This object is used to send packets over RAW socket on a interface.
 
     :param interface_name: Which interface to send packets from.
     This object is used to send packets over RAW socket on a interface.
 
     :param interface_name: Which interface to send packets from.

-    :type interface_name: string
+    :type interface_name: str

     """
     def __init__(self, interface_name):
         PacketVerifier.__init__(self, interface_name)
     """
     def __init__(self, interface_name):
         PacketVerifier.__init__(self, interface_name)


@@ -290,13 +283,9 @@ class Interface(object):
     def recv_pkt(self, timeout=3):
         return self.rxq.recv(timeout, self.sent_packets)
 
     def recv_pkt(self, timeout=3):
         return self.rxq.recv(timeout, self.sent_packets)
 

-    def close(self):
-        #self.rxq._proc.terminate()
-        pass
-

 
 def create_gratuitous_arp_request(src_mac, src_ip):
 
 def create_gratuitous_arp_request(src_mac, src_ip):

-    """Creates scapy representation of gratuitous ARP request"""
+    """Creates scapy representation of gratuitous ARP request."""

     return (Ether(src=src_mac, dst='ff:ff:ff:ff:ff:ff') /
             ARP(psrc=src_ip, hwsrc=src_mac, pdst=src_ip))
 
     return (Ether(src=src_mac, dst='ff:ff:ff:ff:ff:ff') /
             ARP(psrc=src_ip, hwsrc=src_mac, pdst=src_ip))
 


@@ -308,3 +297,25 @@ def auto_pad(packet):
         padded += ('\0' * (60 - len(padded)))
     return padded
 
         padded += ('\0' * (60 - len(padded)))
     return padded
 

+
+def checksum_equal(chksum1, chksum2):
+    """Compares two checksums in one's complement notation.
+
+    Checksums to be compared are calculated as 16 bit one's complement of the
+    one's complement sum of 16 bit words of some buffer.
+    In one's complement notation 0x0000 (positive zero) and 0xFFFF
+    (negative zero) are equivalent.
+
+    :param chksum1: First checksum.
+    :param chksum2: Second checksum.
+    :type chksum1: uint16
+    :type chksum2: uint16
+
+    :return: True if checksums are equivalent, False otherwise.
+    :rtype: boolean
+    """
+    if chksum1 == 0xFFFF:
+        chksum1 = 0
+    if chksum2 == 0xFFFF:
+        chksum2 = 0
+    return chksum1 == chksum2